Contents of /trunk/mkinitrd-magellan/busybox/shell/hush.c
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Wed Dec 15 21:33:41 2010 UTC (13 years, 9 months ago) by niro
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Wed Dec 15 21:33:41 2010 UTC (13 years, 9 months ago) by niro
File MIME type: text/plain
File size: 226921 byte(s)
-updated to busybox-1.17.4
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * A prototype Bourne shell grammar parser. |
4 | * Intended to follow the original Thompson and Ritchie |
5 | * "small and simple is beautiful" philosophy, which |
6 | * incidentally is a good match to today's BusyBox. |
7 | * |
8 | * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org> |
9 | * Copyright (C) 2008,2009 Denys Vlasenko <vda.linux@googlemail.com> |
10 | * |
11 | * Credits: |
12 | * The parser routines proper are all original material, first |
13 | * written Dec 2000 and Jan 2001 by Larry Doolittle. The |
14 | * execution engine, the builtins, and much of the underlying |
15 | * support has been adapted from busybox-0.49pre's lash, which is |
16 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
17 | * written by Erik Andersen <andersen@codepoet.org>. That, in turn, |
18 | * is based in part on ladsh.c, by Michael K. Johnson and Erik W. |
19 | * Troan, which they placed in the public domain. I don't know |
20 | * how much of the Johnson/Troan code has survived the repeated |
21 | * rewrites. |
22 | * |
23 | * Other credits: |
24 | * o_addchr derived from similar w_addchar function in glibc-2.2. |
25 | * parse_redirect, redirect_opt_num, and big chunks of main |
26 | * and many builtins derived from contributions by Erik Andersen. |
27 | * Miscellaneous bugfixes from Matt Kraai. |
28 | * |
29 | * There are two big (and related) architecture differences between |
30 | * this parser and the lash parser. One is that this version is |
31 | * actually designed from the ground up to understand nearly all |
32 | * of the Bourne grammar. The second, consequential change is that |
33 | * the parser and input reader have been turned inside out. Now, |
34 | * the parser is in control, and asks for input as needed. The old |
35 | * way had the input reader in control, and it asked for parsing to |
36 | * take place as needed. The new way makes it much easier to properly |
37 | * handle the recursion implicit in the various substitutions, especially |
38 | * across continuation lines. |
39 | * |
40 | * TODOs: |
41 | * grep for "TODO" and fix (some of them are easy) |
42 | * special variables (done: PWD, PPID, RANDOM) |
43 | * tilde expansion |
44 | * aliases |
45 | * follow IFS rules more precisely, including update semantics |
46 | * builtins mandated by standards we don't support: |
47 | * [un]alias, command, fc, getopts, newgrp, readonly, times |
48 | * make complex ${var%...} constructs support optional |
49 | * make here documents optional |
50 | * |
51 | * Bash compat TODO: |
52 | * redirection of stdout+stderr: &> and >& |
53 | * subst operator: ${var/[/]expr/expr} |
54 | * brace expansion: one/{two,three,four} |
55 | * reserved words: function select |
56 | * advanced test: [[ ]] |
57 | * process substitution: <(list) and >(list) |
58 | * =~: regex operator |
59 | * let EXPR [EXPR...] |
60 | * Each EXPR is an arithmetic expression (ARITHMETIC EVALUATION) |
61 | * If the last arg evaluates to 0, let returns 1; 0 otherwise. |
62 | * NB: let `echo 'a=a + 1'` - error (IOW: multi-word expansion is used) |
63 | * ((EXPR)) |
64 | * The EXPR is evaluated according to ARITHMETIC EVALUATION. |
65 | * This is exactly equivalent to let "EXPR". |
66 | * $[EXPR]: synonym for $((EXPR)) |
67 | * export builtin should be special, its arguments are assignments |
68 | * and therefore expansion of them should be "one-word" expansion: |
69 | * $ export i=`echo 'a b'` # export has one arg: "i=a b" |
70 | * compare with: |
71 | * $ ls i=`echo 'a b'` # ls has two args: "i=a" and "b" |
72 | * ls: cannot access i=a: No such file or directory |
73 | * ls: cannot access b: No such file or directory |
74 | * Note1: same applies to local builtin. |
75 | * Note2: bash 3.2.33(1) does this only if export word itself |
76 | * is not quoted: |
77 | * $ export i=`echo 'aaa bbb'`; echo "$i" |
78 | * aaa bbb |
79 | * $ "export" i=`echo 'aaa bbb'`; echo "$i" |
80 | * aaa |
81 | * |
82 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
83 | */ |
84 | #include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */ |
85 | #include <malloc.h> /* for malloc_trim */ |
86 | #include <glob.h> |
87 | /* #include <dmalloc.h> */ |
88 | #if ENABLE_HUSH_CASE |
89 | # include <fnmatch.h> |
90 | #endif |
91 | |
92 | #include "shell_common.h" |
93 | #include "math.h" |
94 | #include "match.h" |
95 | #if ENABLE_HUSH_RANDOM_SUPPORT |
96 | # include "random.h" |
97 | #else |
98 | # define CLEAR_RANDOM_T(rnd) ((void)0) |
99 | #endif |
100 | #ifndef PIPE_BUF |
101 | # define PIPE_BUF 4096 /* amount of buffering in a pipe */ |
102 | #endif |
103 | |
104 | |
105 | /* Build knobs */ |
106 | #define LEAK_HUNTING 0 |
107 | #define BUILD_AS_NOMMU 0 |
108 | /* Enable/disable sanity checks. Ok to enable in production, |
109 | * only adds a bit of bloat. Set to >1 to get non-production level verbosity. |
110 | * Keeping 1 for now even in released versions. |
111 | */ |
112 | #define HUSH_DEBUG 1 |
113 | /* Slightly bigger (+200 bytes), but faster hush. |
114 | * So far it only enables a trick with counting SIGCHLDs and forks, |
115 | * which allows us to do fewer waitpid's. |
116 | * (we can detect a case where neither forks were done nor SIGCHLDs happened |
117 | * and therefore waitpid will return the same result as last time) |
118 | */ |
119 | #define ENABLE_HUSH_FAST 0 |
120 | /* TODO: implement simplified code for users which do not need ${var%...} ops |
121 | * So far ${var%...} ops are always enabled: |
122 | */ |
123 | #define ENABLE_HUSH_DOLLAR_OPS 1 |
124 | |
125 | |
126 | #if BUILD_AS_NOMMU |
127 | # undef BB_MMU |
128 | # undef USE_FOR_NOMMU |
129 | # undef USE_FOR_MMU |
130 | # define BB_MMU 0 |
131 | # define USE_FOR_NOMMU(...) __VA_ARGS__ |
132 | # define USE_FOR_MMU(...) |
133 | #endif |
134 | |
135 | #include "NUM_APPLETS.h" |
136 | #if NUM_APPLETS == 1 |
137 | /* STANDALONE does not make sense, and won't compile */ |
138 | # undef CONFIG_FEATURE_SH_STANDALONE |
139 | # undef ENABLE_FEATURE_SH_STANDALONE |
140 | # undef IF_FEATURE_SH_STANDALONE |
141 | # undef IF_NOT_FEATURE_SH_STANDALONE |
142 | # define ENABLE_FEATURE_SH_STANDALONE 0 |
143 | # define IF_FEATURE_SH_STANDALONE(...) |
144 | # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__ |
145 | #endif |
146 | |
147 | #if !ENABLE_HUSH_INTERACTIVE |
148 | # undef ENABLE_FEATURE_EDITING |
149 | # define ENABLE_FEATURE_EDITING 0 |
150 | # undef ENABLE_FEATURE_EDITING_FANCY_PROMPT |
151 | # define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0 |
152 | #endif |
153 | |
154 | /* Do we support ANY keywords? */ |
155 | #if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE |
156 | # define HAS_KEYWORDS 1 |
157 | # define IF_HAS_KEYWORDS(...) __VA_ARGS__ |
158 | # define IF_HAS_NO_KEYWORDS(...) |
159 | #else |
160 | # define HAS_KEYWORDS 0 |
161 | # define IF_HAS_KEYWORDS(...) |
162 | # define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__ |
163 | #endif |
164 | |
165 | /* If you comment out one of these below, it will be #defined later |
166 | * to perform debug printfs to stderr: */ |
167 | #define debug_printf(...) do {} while (0) |
168 | /* Finer-grained debug switches */ |
169 | #define debug_printf_parse(...) do {} while (0) |
170 | #define debug_print_tree(a, b) do {} while (0) |
171 | #define debug_printf_exec(...) do {} while (0) |
172 | #define debug_printf_env(...) do {} while (0) |
173 | #define debug_printf_jobs(...) do {} while (0) |
174 | #define debug_printf_expand(...) do {} while (0) |
175 | #define debug_printf_varexp(...) do {} while (0) |
176 | #define debug_printf_glob(...) do {} while (0) |
177 | #define debug_printf_list(...) do {} while (0) |
178 | #define debug_printf_subst(...) do {} while (0) |
179 | #define debug_printf_clean(...) do {} while (0) |
180 | |
181 | #define ERR_PTR ((void*)(long)1) |
182 | |
183 | #define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n" |
184 | |
185 | #define _SPECIAL_VARS_STR "_*@$!?#" |
186 | #define SPECIAL_VARS_STR ("_*@$!?#" + 1) |
187 | #define NUMERIC_SPECVARS_STR ("_*@$!?#" + 3) |
188 | |
189 | #define SPECIAL_VAR_SYMBOL 3 |
190 | |
191 | struct variable; |
192 | |
193 | static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER; |
194 | |
195 | /* This supports saving pointers malloced in vfork child, |
196 | * to be freed in the parent. |
197 | */ |
198 | #if !BB_MMU |
199 | typedef struct nommu_save_t { |
200 | char **new_env; |
201 | struct variable *old_vars; |
202 | char **argv; |
203 | char **argv_from_re_execing; |
204 | } nommu_save_t; |
205 | #endif |
206 | |
207 | typedef enum reserved_style { |
208 | RES_NONE = 0, |
209 | #if ENABLE_HUSH_IF |
210 | RES_IF , |
211 | RES_THEN , |
212 | RES_ELIF , |
213 | RES_ELSE , |
214 | RES_FI , |
215 | #endif |
216 | #if ENABLE_HUSH_LOOPS |
217 | RES_FOR , |
218 | RES_WHILE , |
219 | RES_UNTIL , |
220 | RES_DO , |
221 | RES_DONE , |
222 | #endif |
223 | #if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE |
224 | RES_IN , |
225 | #endif |
226 | #if ENABLE_HUSH_CASE |
227 | RES_CASE , |
228 | /* three pseudo-keywords support contrived "case" syntax: */ |
229 | RES_CASE_IN, /* "case ... IN", turns into RES_MATCH when IN is observed */ |
230 | RES_MATCH , /* "word)" */ |
231 | RES_CASE_BODY, /* "this command is inside CASE" */ |
232 | RES_ESAC , |
233 | #endif |
234 | RES_XXXX , |
235 | RES_SNTX |
236 | } reserved_style; |
237 | |
238 | typedef struct o_string { |
239 | char *data; |
240 | int length; /* position where data is appended */ |
241 | int maxlen; |
242 | /* Protect newly added chars against globbing |
243 | * (by prepending \ to *, ?, [, \) */ |
244 | smallint o_escape; |
245 | smallint o_glob; |
246 | /* At least some part of the string was inside '' or "", |
247 | * possibly empty one: word"", wo''rd etc. */ |
248 | smallint o_quoted; |
249 | smallint has_empty_slot; |
250 | smallint o_assignment; /* 0:maybe, 1:yes, 2:no */ |
251 | } o_string; |
252 | enum { |
253 | MAYBE_ASSIGNMENT = 0, |
254 | DEFINITELY_ASSIGNMENT = 1, |
255 | NOT_ASSIGNMENT = 2, |
256 | WORD_IS_KEYWORD = 3, /* not assigment, but next word may be: "if v=xyz cmd;" */ |
257 | }; |
258 | /* Used for initialization: o_string foo = NULL_O_STRING; */ |
259 | #define NULL_O_STRING { NULL } |
260 | |
261 | /* I can almost use ordinary FILE*. Is open_memstream() universally |
262 | * available? Where is it documented? */ |
263 | typedef struct in_str { |
264 | const char *p; |
265 | /* eof_flag=1: last char in ->p is really an EOF */ |
266 | char eof_flag; /* meaningless if ->p == NULL */ |
267 | char peek_buf[2]; |
268 | #if ENABLE_HUSH_INTERACTIVE |
269 | smallint promptme; |
270 | smallint promptmode; /* 0: PS1, 1: PS2 */ |
271 | #endif |
272 | FILE *file; |
273 | int (*get) (struct in_str *) FAST_FUNC; |
274 | int (*peek) (struct in_str *) FAST_FUNC; |
275 | } in_str; |
276 | #define i_getch(input) ((input)->get(input)) |
277 | #define i_peek(input) ((input)->peek(input)) |
278 | |
279 | /* The descrip member of this structure is only used to make |
280 | * debugging output pretty */ |
281 | static const struct { |
282 | int mode; |
283 | signed char default_fd; |
284 | char descrip[3]; |
285 | } redir_table[] = { |
286 | { O_RDONLY, 0, "<" }, |
287 | { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" }, |
288 | { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" }, |
289 | { O_CREAT|O_RDWR, 1, "<>" }, |
290 | { O_RDONLY, 0, "<<" }, |
291 | /* Should not be needed. Bogus default_fd helps in debugging */ |
292 | /* { O_RDONLY, 77, "<<" }, */ |
293 | }; |
294 | |
295 | struct redir_struct { |
296 | struct redir_struct *next; |
297 | char *rd_filename; /* filename */ |
298 | int rd_fd; /* fd to redirect */ |
299 | /* fd to redirect to, or -3 if rd_fd is to be closed (n>&-) */ |
300 | int rd_dup; |
301 | smallint rd_type; /* (enum redir_type) */ |
302 | /* note: for heredocs, rd_filename contains heredoc delimiter, |
303 | * and subsequently heredoc itself; and rd_dup is a bitmask: |
304 | * bit 0: do we need to trim leading tabs? |
305 | * bit 1: is heredoc quoted (<<'delim' syntax) ? |
306 | */ |
307 | }; |
308 | typedef enum redir_type { |
309 | REDIRECT_INPUT = 0, |
310 | REDIRECT_OVERWRITE = 1, |
311 | REDIRECT_APPEND = 2, |
312 | REDIRECT_IO = 3, |
313 | REDIRECT_HEREDOC = 4, |
314 | REDIRECT_HEREDOC2 = 5, /* REDIRECT_HEREDOC after heredoc is loaded */ |
315 | |
316 | REDIRFD_CLOSE = -3, |
317 | REDIRFD_SYNTAX_ERR = -2, |
318 | REDIRFD_TO_FILE = -1, |
319 | /* otherwise, rd_fd is redirected to rd_dup */ |
320 | |
321 | HEREDOC_SKIPTABS = 1, |
322 | HEREDOC_QUOTED = 2, |
323 | } redir_type; |
324 | |
325 | |
326 | struct command { |
327 | pid_t pid; /* 0 if exited */ |
328 | int assignment_cnt; /* how many argv[i] are assignments? */ |
329 | smallint is_stopped; /* is the command currently running? */ |
330 | smallint cmd_type; /* CMD_xxx */ |
331 | #define CMD_NORMAL 0 |
332 | #define CMD_SUBSHELL 1 |
333 | |
334 | /* used for "[[ EXPR ]]" */ |
335 | #if ENABLE_HUSH_BASH_COMPAT |
336 | # define CMD_SINGLEWORD_NOGLOB 2 |
337 | #endif |
338 | |
339 | /* used for "export noglob=* glob* a=`echo a b`" */ |
340 | //#define CMD_SINGLEWORD_NOGLOB_COND 3 |
341 | // It is hard to implement correctly, it adds significant amounts of tricky code, |
342 | // and all this is only useful for really obscure export statements |
343 | // almost nobody would use anyway. #ifdef CMD_SINGLEWORD_NOGLOB_COND |
344 | // guards the code which implements it, but I have doubts it works |
345 | // in all cases (especially with mixed globbed/non-globbed arguments) |
346 | |
347 | #if ENABLE_HUSH_FUNCTIONS |
348 | # define CMD_FUNCDEF 3 |
349 | #endif |
350 | |
351 | /* if non-NULL, this "command" is { list }, ( list ), or a compound statement */ |
352 | struct pipe *group; |
353 | #if !BB_MMU |
354 | char *group_as_string; |
355 | #endif |
356 | #if ENABLE_HUSH_FUNCTIONS |
357 | struct function *child_func; |
358 | /* This field is used to prevent a bug here: |
359 | * while...do f1() {a;}; f1; f1() {b;}; f1; done |
360 | * When we execute "f1() {a;}" cmd, we create new function and clear |
361 | * cmd->group, cmd->group_as_string, cmd->argv[0]. |
362 | * When we execute "f1() {b;}", we notice that f1 exists, |
363 | * and that its "parent cmd" struct is still "alive", |
364 | * we put those fields back into cmd->xxx |
365 | * (struct function has ->parent_cmd ptr to facilitate that). |
366 | * When we loop back, we can execute "f1() {a;}" again and set f1 correctly. |
367 | * Without this trick, loop would execute a;b;b;b;... |
368 | * instead of correct sequence a;b;a;b;... |
369 | * When command is freed, it severs the link |
370 | * (sets ->child_func->parent_cmd to NULL). |
371 | */ |
372 | #endif |
373 | char **argv; /* command name and arguments */ |
374 | /* argv vector may contain variable references (^Cvar^C, ^C0^C etc) |
375 | * and on execution these are substituted with their values. |
376 | * Substitution can make _several_ words out of one argv[n]! |
377 | * Example: argv[0]=='.^C*^C.' here: echo .$*. |
378 | * References of the form ^C`cmd arg^C are `cmd arg` substitutions. |
379 | */ |
380 | struct redir_struct *redirects; /* I/O redirections */ |
381 | }; |
382 | /* Is there anything in this command at all? */ |
383 | #define IS_NULL_CMD(cmd) \ |
384 | (!(cmd)->group && !(cmd)->argv && !(cmd)->redirects) |
385 | |
386 | |
387 | struct pipe { |
388 | struct pipe *next; |
389 | int num_cmds; /* total number of commands in pipe */ |
390 | int alive_cmds; /* number of commands running (not exited) */ |
391 | int stopped_cmds; /* number of commands alive, but stopped */ |
392 | #if ENABLE_HUSH_JOB |
393 | int jobid; /* job number */ |
394 | pid_t pgrp; /* process group ID for the job */ |
395 | char *cmdtext; /* name of job */ |
396 | #endif |
397 | struct command *cmds; /* array of commands in pipe */ |
398 | smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */ |
399 | IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */ |
400 | IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */ |
401 | }; |
402 | typedef enum pipe_style { |
403 | PIPE_SEQ = 1, |
404 | PIPE_AND = 2, |
405 | PIPE_OR = 3, |
406 | PIPE_BG = 4, |
407 | } pipe_style; |
408 | /* Is there anything in this pipe at all? */ |
409 | #define IS_NULL_PIPE(pi) \ |
410 | ((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE)) |
411 | |
412 | /* This holds pointers to the various results of parsing */ |
413 | struct parse_context { |
414 | /* linked list of pipes */ |
415 | struct pipe *list_head; |
416 | /* last pipe (being constructed right now) */ |
417 | struct pipe *pipe; |
418 | /* last command in pipe (being constructed right now) */ |
419 | struct command *command; |
420 | /* last redirect in command->redirects list */ |
421 | struct redir_struct *pending_redirect; |
422 | #if !BB_MMU |
423 | o_string as_string; |
424 | #endif |
425 | #if HAS_KEYWORDS |
426 | smallint ctx_res_w; |
427 | smallint ctx_inverted; /* "! cmd | cmd" */ |
428 | #if ENABLE_HUSH_CASE |
429 | smallint ctx_dsemicolon; /* ";;" seen */ |
430 | #endif |
431 | /* bitmask of FLAG_xxx, for figuring out valid reserved words */ |
432 | int old_flag; |
433 | /* group we are enclosed in: |
434 | * example: "if pipe1; pipe2; then pipe3; fi" |
435 | * when we see "if" or "then", we malloc and copy current context, |
436 | * and make ->stack point to it. then we parse pipeN. |
437 | * when closing "then" / fi" / whatever is found, |
438 | * we move list_head into ->stack->command->group, |
439 | * copy ->stack into current context, and delete ->stack. |
440 | * (parsing of { list } and ( list ) doesn't use this method) |
441 | */ |
442 | struct parse_context *stack; |
443 | #endif |
444 | }; |
445 | |
446 | /* On program start, environ points to initial environment. |
447 | * putenv adds new pointers into it, unsetenv removes them. |
448 | * Neither of these (de)allocates the strings. |
449 | * setenv allocates new strings in malloc space and does putenv, |
450 | * and thus setenv is unusable (leaky) for shell's purposes */ |
451 | #define setenv(...) setenv_is_leaky_dont_use() |
452 | struct variable { |
453 | struct variable *next; |
454 | char *varstr; /* points to "name=" portion */ |
455 | #if ENABLE_HUSH_LOCAL |
456 | unsigned func_nest_level; |
457 | #endif |
458 | int max_len; /* if > 0, name is part of initial env; else name is malloced */ |
459 | smallint flg_export; /* putenv should be done on this var */ |
460 | smallint flg_read_only; |
461 | }; |
462 | |
463 | enum { |
464 | BC_BREAK = 1, |
465 | BC_CONTINUE = 2, |
466 | }; |
467 | |
468 | #if ENABLE_HUSH_FUNCTIONS |
469 | struct function { |
470 | struct function *next; |
471 | char *name; |
472 | struct command *parent_cmd; |
473 | struct pipe *body; |
474 | # if !BB_MMU |
475 | char *body_as_string; |
476 | # endif |
477 | }; |
478 | #endif |
479 | |
480 | |
481 | /* "Globals" within this file */ |
482 | /* Sorted roughly by size (smaller offsets == smaller code) */ |
483 | struct globals { |
484 | /* interactive_fd != 0 means we are an interactive shell. |
485 | * If we are, then saved_tty_pgrp can also be != 0, meaning |
486 | * that controlling tty is available. With saved_tty_pgrp == 0, |
487 | * job control still works, but terminal signals |
488 | * (^C, ^Z, ^Y, ^\) won't work at all, and background |
489 | * process groups can only be created with "cmd &". |
490 | * With saved_tty_pgrp != 0, hush will use tcsetpgrp() |
491 | * to give tty to the foreground process group, |
492 | * and will take it back when the group is stopped (^Z) |
493 | * or killed (^C). |
494 | */ |
495 | #if ENABLE_HUSH_INTERACTIVE |
496 | /* 'interactive_fd' is a fd# open to ctty, if we have one |
497 | * _AND_ if we decided to act interactively */ |
498 | int interactive_fd; |
499 | const char *PS1; |
500 | const char *PS2; |
501 | # define G_interactive_fd (G.interactive_fd) |
502 | #else |
503 | # define G_interactive_fd 0 |
504 | #endif |
505 | #if ENABLE_FEATURE_EDITING |
506 | line_input_t *line_input_state; |
507 | #endif |
508 | pid_t root_pid; |
509 | pid_t root_ppid; |
510 | pid_t last_bg_pid; |
511 | #if ENABLE_HUSH_RANDOM_SUPPORT |
512 | random_t random_gen; |
513 | #endif |
514 | #if ENABLE_HUSH_JOB |
515 | int run_list_level; |
516 | int last_jobid; |
517 | pid_t saved_tty_pgrp; |
518 | struct pipe *job_list; |
519 | # define G_saved_tty_pgrp (G.saved_tty_pgrp) |
520 | #else |
521 | # define G_saved_tty_pgrp 0 |
522 | #endif |
523 | smallint flag_SIGINT; |
524 | #if ENABLE_HUSH_LOOPS |
525 | smallint flag_break_continue; |
526 | #endif |
527 | #if ENABLE_HUSH_FUNCTIONS |
528 | /* 0: outside of a function (or sourced file) |
529 | * -1: inside of a function, ok to use return builtin |
530 | * 1: return is invoked, skip all till end of func |
531 | */ |
532 | smallint flag_return_in_progress; |
533 | #endif |
534 | smallint fake_mode; |
535 | smallint exiting; /* used to prevent EXIT trap recursion */ |
536 | /* These four support $?, $#, and $1 */ |
537 | smalluint last_exitcode; |
538 | /* are global_argv and global_argv[1..n] malloced? (note: not [0]) */ |
539 | smalluint global_args_malloced; |
540 | smalluint inherited_set_is_saved; |
541 | /* how many non-NULL argv's we have. NB: $# + 1 */ |
542 | int global_argc; |
543 | char **global_argv; |
544 | #if !BB_MMU |
545 | char *argv0_for_re_execing; |
546 | #endif |
547 | #if ENABLE_HUSH_LOOPS |
548 | unsigned depth_break_continue; |
549 | unsigned depth_of_loop; |
550 | #endif |
551 | const char *ifs; |
552 | const char *cwd; |
553 | struct variable *top_var; /* = &G.shell_ver (set in main()) */ |
554 | struct variable shell_ver; |
555 | #if ENABLE_HUSH_FUNCTIONS |
556 | struct function *top_func; |
557 | # if ENABLE_HUSH_LOCAL |
558 | struct variable **shadowed_vars_pp; |
559 | unsigned func_nest_level; |
560 | # endif |
561 | #endif |
562 | /* Signal and trap handling */ |
563 | #if ENABLE_HUSH_FAST |
564 | unsigned count_SIGCHLD; |
565 | unsigned handled_SIGCHLD; |
566 | smallint we_have_children; |
567 | #endif |
568 | /* which signals have non-DFL handler (even with no traps set)? */ |
569 | unsigned non_DFL_mask; |
570 | char **traps; /* char *traps[NSIG] */ |
571 | sigset_t blocked_set; |
572 | sigset_t inherited_set; |
573 | #if HUSH_DEBUG |
574 | unsigned long memleak_value; |
575 | int debug_indent; |
576 | #endif |
577 | char user_input_buf[ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 2]; |
578 | }; |
579 | #define G (*ptr_to_globals) |
580 | /* Not #defining name to G.name - this quickly gets unwieldy |
581 | * (too many defines). Also, I actually prefer to see when a variable |
582 | * is global, thus "G." prefix is a useful hint */ |
583 | #define INIT_G() do { \ |
584 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
585 | } while (0) |
586 | |
587 | |
588 | /* Function prototypes for builtins */ |
589 | static int builtin_cd(char **argv) FAST_FUNC; |
590 | static int builtin_echo(char **argv) FAST_FUNC; |
591 | static int builtin_eval(char **argv) FAST_FUNC; |
592 | static int builtin_exec(char **argv) FAST_FUNC; |
593 | static int builtin_exit(char **argv) FAST_FUNC; |
594 | static int builtin_export(char **argv) FAST_FUNC; |
595 | #if ENABLE_HUSH_JOB |
596 | static int builtin_fg_bg(char **argv) FAST_FUNC; |
597 | static int builtin_jobs(char **argv) FAST_FUNC; |
598 | #endif |
599 | #if ENABLE_HUSH_HELP |
600 | static int builtin_help(char **argv) FAST_FUNC; |
601 | #endif |
602 | #if ENABLE_HUSH_LOCAL |
603 | static int builtin_local(char **argv) FAST_FUNC; |
604 | #endif |
605 | #if HUSH_DEBUG |
606 | static int builtin_memleak(char **argv) FAST_FUNC; |
607 | #endif |
608 | #if ENABLE_PRINTF |
609 | static int builtin_printf(char **argv) FAST_FUNC; |
610 | #endif |
611 | static int builtin_pwd(char **argv) FAST_FUNC; |
612 | static int builtin_read(char **argv) FAST_FUNC; |
613 | static int builtin_set(char **argv) FAST_FUNC; |
614 | static int builtin_shift(char **argv) FAST_FUNC; |
615 | static int builtin_source(char **argv) FAST_FUNC; |
616 | static int builtin_test(char **argv) FAST_FUNC; |
617 | static int builtin_trap(char **argv) FAST_FUNC; |
618 | static int builtin_type(char **argv) FAST_FUNC; |
619 | static int builtin_true(char **argv) FAST_FUNC; |
620 | static int builtin_umask(char **argv) FAST_FUNC; |
621 | static int builtin_unset(char **argv) FAST_FUNC; |
622 | static int builtin_wait(char **argv) FAST_FUNC; |
623 | #if ENABLE_HUSH_LOOPS |
624 | static int builtin_break(char **argv) FAST_FUNC; |
625 | static int builtin_continue(char **argv) FAST_FUNC; |
626 | #endif |
627 | #if ENABLE_HUSH_FUNCTIONS |
628 | static int builtin_return(char **argv) FAST_FUNC; |
629 | #endif |
630 | |
631 | /* Table of built-in functions. They can be forked or not, depending on |
632 | * context: within pipes, they fork. As simple commands, they do not. |
633 | * When used in non-forking context, they can change global variables |
634 | * in the parent shell process. If forked, of course they cannot. |
635 | * For example, 'unset foo | whatever' will parse and run, but foo will |
636 | * still be set at the end. */ |
637 | struct built_in_command { |
638 | const char *b_cmd; |
639 | int (*b_function)(char **argv) FAST_FUNC; |
640 | #if ENABLE_HUSH_HELP |
641 | const char *b_descr; |
642 | # define BLTIN(cmd, func, help) { cmd, func, help } |
643 | #else |
644 | # define BLTIN(cmd, func, help) { cmd, func } |
645 | #endif |
646 | }; |
647 | |
648 | static const struct built_in_command bltins1[] = { |
649 | BLTIN("." , builtin_source , "Run commands in a file"), |
650 | BLTIN(":" , builtin_true , NULL), |
651 | #if ENABLE_HUSH_JOB |
652 | BLTIN("bg" , builtin_fg_bg , "Resume a job in the background"), |
653 | #endif |
654 | #if ENABLE_HUSH_LOOPS |
655 | BLTIN("break" , builtin_break , "Exit from a loop"), |
656 | #endif |
657 | BLTIN("cd" , builtin_cd , "Change directory"), |
658 | #if ENABLE_HUSH_LOOPS |
659 | BLTIN("continue" , builtin_continue, "Start new loop iteration"), |
660 | #endif |
661 | BLTIN("eval" , builtin_eval , "Construct and run shell command"), |
662 | BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"), |
663 | BLTIN("exit" , builtin_exit , "Exit"), |
664 | BLTIN("export" , builtin_export , "Set environment variables"), |
665 | #if ENABLE_HUSH_JOB |
666 | BLTIN("fg" , builtin_fg_bg , "Bring job into the foreground"), |
667 | #endif |
668 | #if ENABLE_HUSH_HELP |
669 | BLTIN("help" , builtin_help , NULL), |
670 | #endif |
671 | #if ENABLE_HUSH_JOB |
672 | BLTIN("jobs" , builtin_jobs , "List jobs"), |
673 | #endif |
674 | #if ENABLE_HUSH_LOCAL |
675 | BLTIN("local" , builtin_local , "Set local variables"), |
676 | #endif |
677 | #if HUSH_DEBUG |
678 | BLTIN("memleak" , builtin_memleak , NULL), |
679 | #endif |
680 | BLTIN("read" , builtin_read , "Input into variable"), |
681 | #if ENABLE_HUSH_FUNCTIONS |
682 | BLTIN("return" , builtin_return , "Return from a function"), |
683 | #endif |
684 | BLTIN("set" , builtin_set , "Set/unset positional parameters"), |
685 | BLTIN("shift" , builtin_shift , "Shift positional parameters"), |
686 | #if ENABLE_HUSH_BASH_COMPAT |
687 | BLTIN("source" , builtin_source , "Run commands in a file"), |
688 | #endif |
689 | BLTIN("trap" , builtin_trap , "Trap signals"), |
690 | BLTIN("type" , builtin_type , "Show command type"), |
691 | BLTIN("ulimit" , shell_builtin_ulimit , "Control resource limits"), |
692 | BLTIN("umask" , builtin_umask , "Set file creation mask"), |
693 | BLTIN("unset" , builtin_unset , "Unset variables"), |
694 | BLTIN("wait" , builtin_wait , "Wait for process"), |
695 | }; |
696 | /* For now, echo and test are unconditionally enabled. |
697 | * Maybe make it configurable? */ |
698 | static const struct built_in_command bltins2[] = { |
699 | BLTIN("[" , builtin_test , NULL), |
700 | BLTIN("echo" , builtin_echo , NULL), |
701 | #if ENABLE_PRINTF |
702 | BLTIN("printf" , builtin_printf , NULL), |
703 | #endif |
704 | BLTIN("pwd" , builtin_pwd , NULL), |
705 | BLTIN("test" , builtin_test , NULL), |
706 | }; |
707 | |
708 | |
709 | /* Debug printouts. |
710 | */ |
711 | #if HUSH_DEBUG |
712 | /* prevent disasters with G.debug_indent < 0 */ |
713 | # define indent() fprintf(stderr, "%*s", (G.debug_indent * 2) & 0xff, "") |
714 | # define debug_enter() (G.debug_indent++) |
715 | # define debug_leave() (G.debug_indent--) |
716 | #else |
717 | # define indent() ((void)0) |
718 | # define debug_enter() ((void)0) |
719 | # define debug_leave() ((void)0) |
720 | #endif |
721 | |
722 | #ifndef debug_printf |
723 | # define debug_printf(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
724 | #endif |
725 | |
726 | #ifndef debug_printf_parse |
727 | # define debug_printf_parse(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
728 | #endif |
729 | |
730 | #ifndef debug_printf_exec |
731 | #define debug_printf_exec(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
732 | #endif |
733 | |
734 | #ifndef debug_printf_env |
735 | # define debug_printf_env(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
736 | #endif |
737 | |
738 | #ifndef debug_printf_jobs |
739 | # define debug_printf_jobs(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
740 | # define DEBUG_JOBS 1 |
741 | #else |
742 | # define DEBUG_JOBS 0 |
743 | #endif |
744 | |
745 | #ifndef debug_printf_expand |
746 | # define debug_printf_expand(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
747 | # define DEBUG_EXPAND 1 |
748 | #else |
749 | # define DEBUG_EXPAND 0 |
750 | #endif |
751 | |
752 | #ifndef debug_printf_varexp |
753 | # define debug_printf_varexp(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
754 | #endif |
755 | |
756 | #ifndef debug_printf_glob |
757 | # define debug_printf_glob(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
758 | # define DEBUG_GLOB 1 |
759 | #else |
760 | # define DEBUG_GLOB 0 |
761 | #endif |
762 | |
763 | #ifndef debug_printf_list |
764 | # define debug_printf_list(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
765 | #endif |
766 | |
767 | #ifndef debug_printf_subst |
768 | # define debug_printf_subst(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
769 | #endif |
770 | |
771 | #ifndef debug_printf_clean |
772 | # define debug_printf_clean(...) (indent(), fprintf(stderr, __VA_ARGS__)) |
773 | # define DEBUG_CLEAN 1 |
774 | #else |
775 | # define DEBUG_CLEAN 0 |
776 | #endif |
777 | |
778 | #if DEBUG_EXPAND |
779 | static void debug_print_strings(const char *prefix, char **vv) |
780 | { |
781 | indent(); |
782 | fprintf(stderr, "%s:\n", prefix); |
783 | while (*vv) |
784 | fprintf(stderr, " '%s'\n", *vv++); |
785 | } |
786 | #else |
787 | # define debug_print_strings(prefix, vv) ((void)0) |
788 | #endif |
789 | |
790 | |
791 | /* Leak hunting. Use hush_leaktool.sh for post-processing. |
792 | */ |
793 | #if LEAK_HUNTING |
794 | static void *xxmalloc(int lineno, size_t size) |
795 | { |
796 | void *ptr = xmalloc((size + 0xff) & ~0xff); |
797 | fdprintf(2, "line %d: malloc %p\n", lineno, ptr); |
798 | return ptr; |
799 | } |
800 | static void *xxrealloc(int lineno, void *ptr, size_t size) |
801 | { |
802 | ptr = xrealloc(ptr, (size + 0xff) & ~0xff); |
803 | fdprintf(2, "line %d: realloc %p\n", lineno, ptr); |
804 | return ptr; |
805 | } |
806 | static char *xxstrdup(int lineno, const char *str) |
807 | { |
808 | char *ptr = xstrdup(str); |
809 | fdprintf(2, "line %d: strdup %p\n", lineno, ptr); |
810 | return ptr; |
811 | } |
812 | static void xxfree(void *ptr) |
813 | { |
814 | fdprintf(2, "free %p\n", ptr); |
815 | free(ptr); |
816 | } |
817 | # define xmalloc(s) xxmalloc(__LINE__, s) |
818 | # define xrealloc(p, s) xxrealloc(__LINE__, p, s) |
819 | # define xstrdup(s) xxstrdup(__LINE__, s) |
820 | # define free(p) xxfree(p) |
821 | #endif |
822 | |
823 | |
824 | /* Syntax and runtime errors. They always abort scripts. |
825 | * In interactive use they usually discard unparsed and/or unexecuted commands |
826 | * and return to the prompt. |
827 | * HUSH_DEBUG >= 2 prints line number in this file where it was detected. |
828 | */ |
829 | #if HUSH_DEBUG < 2 |
830 | # define die_if_script(lineno, ...) die_if_script(__VA_ARGS__) |
831 | # define syntax_error(lineno, msg) syntax_error(msg) |
832 | # define syntax_error_at(lineno, msg) syntax_error_at(msg) |
833 | # define syntax_error_unterm_ch(lineno, ch) syntax_error_unterm_ch(ch) |
834 | # define syntax_error_unterm_str(lineno, s) syntax_error_unterm_str(s) |
835 | # define syntax_error_unexpected_ch(lineno, ch) syntax_error_unexpected_ch(ch) |
836 | #endif |
837 | |
838 | static void die_if_script(unsigned lineno, const char *fmt, ...) |
839 | { |
840 | va_list p; |
841 | |
842 | #if HUSH_DEBUG >= 2 |
843 | bb_error_msg("hush.c:%u", lineno); |
844 | #endif |
845 | va_start(p, fmt); |
846 | bb_verror_msg(fmt, p, NULL); |
847 | va_end(p); |
848 | if (!G_interactive_fd) |
849 | xfunc_die(); |
850 | } |
851 | |
852 | static void syntax_error(unsigned lineno, const char *msg) |
853 | { |
854 | if (msg) |
855 | die_if_script(lineno, "syntax error: %s", msg); |
856 | else |
857 | die_if_script(lineno, "syntax error", NULL); |
858 | } |
859 | |
860 | static void syntax_error_at(unsigned lineno, const char *msg) |
861 | { |
862 | die_if_script(lineno, "syntax error at '%s'", msg); |
863 | } |
864 | |
865 | static void syntax_error_unterm_str(unsigned lineno, const char *s) |
866 | { |
867 | die_if_script(lineno, "syntax error: unterminated %s", s); |
868 | } |
869 | |
870 | /* It so happens that all such cases are totally fatal |
871 | * even if shell is interactive: EOF while looking for closing |
872 | * delimiter. There is nowhere to read stuff from after that, |
873 | * it's EOF! The only choice is to terminate. |
874 | */ |
875 | static void syntax_error_unterm_ch(unsigned lineno, char ch) NORETURN; |
876 | static void syntax_error_unterm_ch(unsigned lineno, char ch) |
877 | { |
878 | char msg[2] = { ch, '\0' }; |
879 | syntax_error_unterm_str(lineno, msg); |
880 | xfunc_die(); |
881 | } |
882 | |
883 | static void syntax_error_unexpected_ch(unsigned lineno, int ch) |
884 | { |
885 | char msg[2]; |
886 | msg[0] = ch; |
887 | msg[1] = '\0'; |
888 | die_if_script(lineno, "syntax error: unexpected %s", ch == EOF ? "EOF" : msg); |
889 | } |
890 | |
891 | #if HUSH_DEBUG < 2 |
892 | # undef die_if_script |
893 | # undef syntax_error |
894 | # undef syntax_error_at |
895 | # undef syntax_error_unterm_ch |
896 | # undef syntax_error_unterm_str |
897 | # undef syntax_error_unexpected_ch |
898 | #else |
899 | # define die_if_script(...) die_if_script(__LINE__, __VA_ARGS__) |
900 | # define syntax_error(msg) syntax_error(__LINE__, msg) |
901 | # define syntax_error_at(msg) syntax_error_at(__LINE__, msg) |
902 | # define syntax_error_unterm_ch(ch) syntax_error_unterm_ch(__LINE__, ch) |
903 | # define syntax_error_unterm_str(s) syntax_error_unterm_str(__LINE__, s) |
904 | # define syntax_error_unexpected_ch(ch) syntax_error_unexpected_ch(__LINE__, ch) |
905 | #endif |
906 | |
907 | |
908 | #if ENABLE_HUSH_INTERACTIVE |
909 | static void cmdedit_update_prompt(void); |
910 | #else |
911 | # define cmdedit_update_prompt() ((void)0) |
912 | #endif |
913 | |
914 | |
915 | /* Utility functions |
916 | */ |
917 | /* Replace each \x with x in place, return ptr past NUL. */ |
918 | static char *unbackslash(char *src) |
919 | { |
920 | char *dst = src = strchrnul(src, '\\'); |
921 | while (1) { |
922 | if (*src == '\\') |
923 | src++; |
924 | if ((*dst++ = *src++) == '\0') |
925 | break; |
926 | } |
927 | return dst; |
928 | } |
929 | |
930 | static char **add_strings_to_strings(char **strings, char **add, int need_to_dup) |
931 | { |
932 | int i; |
933 | unsigned count1; |
934 | unsigned count2; |
935 | char **v; |
936 | |
937 | v = strings; |
938 | count1 = 0; |
939 | if (v) { |
940 | while (*v) { |
941 | count1++; |
942 | v++; |
943 | } |
944 | } |
945 | count2 = 0; |
946 | v = add; |
947 | while (*v) { |
948 | count2++; |
949 | v++; |
950 | } |
951 | v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*)); |
952 | v[count1 + count2] = NULL; |
953 | i = count2; |
954 | while (--i >= 0) |
955 | v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]); |
956 | return v; |
957 | } |
958 | #if LEAK_HUNTING |
959 | static char **xx_add_strings_to_strings(int lineno, char **strings, char **add, int need_to_dup) |
960 | { |
961 | char **ptr = add_strings_to_strings(strings, add, need_to_dup); |
962 | fdprintf(2, "line %d: add_strings_to_strings %p\n", lineno, ptr); |
963 | return ptr; |
964 | } |
965 | #define add_strings_to_strings(strings, add, need_to_dup) \ |
966 | xx_add_strings_to_strings(__LINE__, strings, add, need_to_dup) |
967 | #endif |
968 | |
969 | /* Note: takes ownership of "add" ptr (it is not strdup'ed) */ |
970 | static char **add_string_to_strings(char **strings, char *add) |
971 | { |
972 | char *v[2]; |
973 | v[0] = add; |
974 | v[1] = NULL; |
975 | return add_strings_to_strings(strings, v, /*dup:*/ 0); |
976 | } |
977 | #if LEAK_HUNTING |
978 | static char **xx_add_string_to_strings(int lineno, char **strings, char *add) |
979 | { |
980 | char **ptr = add_string_to_strings(strings, add); |
981 | fdprintf(2, "line %d: add_string_to_strings %p\n", lineno, ptr); |
982 | return ptr; |
983 | } |
984 | #define add_string_to_strings(strings, add) \ |
985 | xx_add_string_to_strings(__LINE__, strings, add) |
986 | #endif |
987 | |
988 | static void free_strings(char **strings) |
989 | { |
990 | char **v; |
991 | |
992 | if (!strings) |
993 | return; |
994 | v = strings; |
995 | while (*v) { |
996 | free(*v); |
997 | v++; |
998 | } |
999 | free(strings); |
1000 | } |
1001 | |
1002 | |
1003 | /* Helpers for setting new $n and restoring them back |
1004 | */ |
1005 | typedef struct save_arg_t { |
1006 | char *sv_argv0; |
1007 | char **sv_g_argv; |
1008 | int sv_g_argc; |
1009 | smallint sv_g_malloced; |
1010 | } save_arg_t; |
1011 | |
1012 | static void save_and_replace_G_args(save_arg_t *sv, char **argv) |
1013 | { |
1014 | int n; |
1015 | |
1016 | sv->sv_argv0 = argv[0]; |
1017 | sv->sv_g_argv = G.global_argv; |
1018 | sv->sv_g_argc = G.global_argc; |
1019 | sv->sv_g_malloced = G.global_args_malloced; |
1020 | |
1021 | argv[0] = G.global_argv[0]; /* retain $0 */ |
1022 | G.global_argv = argv; |
1023 | G.global_args_malloced = 0; |
1024 | |
1025 | n = 1; |
1026 | while (*++argv) |
1027 | n++; |
1028 | G.global_argc = n; |
1029 | } |
1030 | |
1031 | static void restore_G_args(save_arg_t *sv, char **argv) |
1032 | { |
1033 | char **pp; |
1034 | |
1035 | if (G.global_args_malloced) { |
1036 | /* someone ran "set -- arg1 arg2 ...", undo */ |
1037 | pp = G.global_argv; |
1038 | while (*++pp) /* note: does not free $0 */ |
1039 | free(*pp); |
1040 | free(G.global_argv); |
1041 | } |
1042 | argv[0] = sv->sv_argv0; |
1043 | G.global_argv = sv->sv_g_argv; |
1044 | G.global_argc = sv->sv_g_argc; |
1045 | G.global_args_malloced = sv->sv_g_malloced; |
1046 | } |
1047 | |
1048 | |
1049 | /* Basic theory of signal handling in shell |
1050 | * ======================================== |
1051 | * This does not describe what hush does, rather, it is current understanding |
1052 | * what it _should_ do. If it doesn't, it's a bug. |
1053 | * http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap |
1054 | * |
1055 | * Signals are handled only after each pipe ("cmd | cmd | cmd" thing) |
1056 | * is finished or backgrounded. It is the same in interactive and |
1057 | * non-interactive shells, and is the same regardless of whether |
1058 | * a user trap handler is installed or a shell special one is in effect. |
1059 | * ^C or ^Z from keyboard seems to execute "at once" because it usually |
1060 | * backgrounds (i.e. stops) or kills all members of currently running |
1061 | * pipe. |
1062 | * |
1063 | * Wait builtin in interruptible by signals for which user trap is set |
1064 | * or by SIGINT in interactive shell. |
1065 | * |
1066 | * Trap handlers will execute even within trap handlers. (right?) |
1067 | * |
1068 | * User trap handlers are forgotten when subshell ("(cmd)") is entered, |
1069 | * except for handlers set to '' (empty string). |
1070 | * |
1071 | * If job control is off, backgrounded commands ("cmd &") |
1072 | * have SIGINT, SIGQUIT set to SIG_IGN. |
1073 | * |
1074 | * Commands which are run in command substitution ("`cmd`") |
1075 | * have SIGTTIN, SIGTTOU, SIGTSTP set to SIG_IGN. |
1076 | * |
1077 | * Ordinary commands have signals set to SIG_IGN/DFL as inherited |
1078 | * by the shell from its parent. |
1079 | * |
1080 | * Signals which differ from SIG_DFL action |
1081 | * (note: child (i.e., [v]forked) shell is not an interactive shell): |
1082 | * |
1083 | * SIGQUIT: ignore |
1084 | * SIGTERM (interactive): ignore |
1085 | * SIGHUP (interactive): |
1086 | * send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit |
1087 | * SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore |
1088 | * Note that ^Z is handled not by trapping SIGTSTP, but by seeing |
1089 | * that all pipe members are stopped. Try this in bash: |
1090 | * while :; do :; done - ^Z does not background it |
1091 | * (while :; do :; done) - ^Z backgrounds it |
1092 | * SIGINT (interactive): wait for last pipe, ignore the rest |
1093 | * of the command line, show prompt. NB: ^C does not send SIGINT |
1094 | * to interactive shell while shell is waiting for a pipe, |
1095 | * since shell is bg'ed (is not in foreground process group). |
1096 | * Example 1: this waits 5 sec, but does not execute ls: |
1097 | * "echo $$; sleep 5; ls -l" + "kill -INT <pid>" |
1098 | * Example 2: this does not wait and does not execute ls: |
1099 | * "echo $$; sleep 5 & wait; ls -l" + "kill -INT <pid>" |
1100 | * Example 3: this does not wait 5 sec, but executes ls: |
1101 | * "sleep 5; ls -l" + press ^C |
1102 | * |
1103 | * (What happens to signals which are IGN on shell start?) |
1104 | * (What happens with signal mask on shell start?) |
1105 | * |
1106 | * Implementation in hush |
1107 | * ====================== |
1108 | * We use in-kernel pending signal mask to determine which signals were sent. |
1109 | * We block all signals which we don't want to take action immediately, |
1110 | * i.e. we block all signals which need to have special handling as described |
1111 | * above, and all signals which have traps set. |
1112 | * After each pipe execution, we extract any pending signals via sigtimedwait() |
1113 | * and act on them. |
1114 | * |
1115 | * unsigned non_DFL_mask: a mask of such "special" signals |
1116 | * sigset_t blocked_set: current blocked signal set |
1117 | * |
1118 | * "trap - SIGxxx": |
1119 | * clear bit in blocked_set unless it is also in non_DFL_mask |
1120 | * "trap 'cmd' SIGxxx": |
1121 | * set bit in blocked_set (even if 'cmd' is '') |
1122 | * after [v]fork, if we plan to be a shell: |
1123 | * unblock signals with special interactive handling |
1124 | * (child shell is not interactive), |
1125 | * unset all traps except '' (note: regardless of child shell's type - {}, (), etc) |
1126 | * after [v]fork, if we plan to exec: |
1127 | * POSIX says fork clears pending signal mask in child - no need to clear it. |
1128 | * Restore blocked signal set to one inherited by shell just prior to exec. |
1129 | * |
1130 | * Note: as a result, we do not use signal handlers much. The only uses |
1131 | * are to count SIGCHLDs |
1132 | * and to restore tty pgrp on signal-induced exit. |
1133 | * |
1134 | * Note 2 (compat): |
1135 | * Standard says "When a subshell is entered, traps that are not being ignored |
1136 | * are set to the default actions". bash interprets it so that traps which |
1137 | * are set to '' (ignore) are NOT reset to defaults. We do the same. |
1138 | */ |
1139 | enum { |
1140 | SPECIAL_INTERACTIVE_SIGS = 0 |
1141 | | (1 << SIGTERM) |
1142 | | (1 << SIGINT) |
1143 | | (1 << SIGHUP) |
1144 | , |
1145 | SPECIAL_JOB_SIGS = 0 |
1146 | #if ENABLE_HUSH_JOB |
1147 | | (1 << SIGTTIN) |
1148 | | (1 << SIGTTOU) |
1149 | | (1 << SIGTSTP) |
1150 | #endif |
1151 | }; |
1152 | |
1153 | #if ENABLE_HUSH_FAST |
1154 | static void SIGCHLD_handler(int sig UNUSED_PARAM) |
1155 | { |
1156 | G.count_SIGCHLD++; |
1157 | //bb_error_msg("[%d] SIGCHLD_handler: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
1158 | } |
1159 | #endif |
1160 | |
1161 | #if ENABLE_HUSH_JOB |
1162 | |
1163 | /* After [v]fork, in child: do not restore tty pgrp on xfunc death */ |
1164 | # define disable_restore_tty_pgrp_on_exit() (die_sleep = 0) |
1165 | /* After [v]fork, in parent: restore tty pgrp on xfunc death */ |
1166 | # define enable_restore_tty_pgrp_on_exit() (die_sleep = -1) |
1167 | |
1168 | /* Restores tty foreground process group, and exits. |
1169 | * May be called as signal handler for fatal signal |
1170 | * (will resend signal to itself, producing correct exit state) |
1171 | * or called directly with -EXITCODE. |
1172 | * We also call it if xfunc is exiting. */ |
1173 | static void sigexit(int sig) NORETURN; |
1174 | static void sigexit(int sig) |
1175 | { |
1176 | /* Disable all signals: job control, SIGPIPE, etc. */ |
1177 | sigprocmask_allsigs(SIG_BLOCK); |
1178 | |
1179 | /* Careful: we can end up here after [v]fork. Do not restore |
1180 | * tty pgrp then, only top-level shell process does that */ |
1181 | if (G_saved_tty_pgrp && getpid() == G.root_pid) |
1182 | tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp); |
1183 | |
1184 | /* Not a signal, just exit */ |
1185 | if (sig <= 0) |
1186 | _exit(- sig); |
1187 | |
1188 | kill_myself_with_sig(sig); /* does not return */ |
1189 | } |
1190 | #else |
1191 | |
1192 | # define disable_restore_tty_pgrp_on_exit() ((void)0) |
1193 | # define enable_restore_tty_pgrp_on_exit() ((void)0) |
1194 | |
1195 | #endif |
1196 | |
1197 | /* Restores tty foreground process group, and exits. */ |
1198 | static void hush_exit(int exitcode) NORETURN; |
1199 | static void hush_exit(int exitcode) |
1200 | { |
1201 | if (G.exiting <= 0 && G.traps && G.traps[0] && G.traps[0][0]) { |
1202 | /* Prevent recursion: |
1203 | * trap "echo Hi; exit" EXIT; exit |
1204 | */ |
1205 | char *argv[] = { NULL, G.traps[0], NULL }; |
1206 | G.traps[0] = NULL; |
1207 | G.exiting = 1; |
1208 | builtin_eval(argv); |
1209 | free(argv[1]); |
1210 | } |
1211 | |
1212 | #if ENABLE_HUSH_JOB |
1213 | fflush_all(); |
1214 | sigexit(- (exitcode & 0xff)); |
1215 | #else |
1216 | exit(exitcode); |
1217 | #endif |
1218 | } |
1219 | |
1220 | static int check_and_run_traps(int sig) |
1221 | { |
1222 | static const struct timespec zero_timespec; |
1223 | smalluint save_rcode; |
1224 | int last_sig = 0; |
1225 | |
1226 | if (sig) |
1227 | goto jump_in; |
1228 | while (1) { |
1229 | sig = sigtimedwait(&G.blocked_set, NULL, &zero_timespec); |
1230 | if (sig <= 0) |
1231 | break; |
1232 | jump_in: |
1233 | last_sig = sig; |
1234 | if (G.traps && G.traps[sig]) { |
1235 | if (G.traps[sig][0]) { |
1236 | /* We have user-defined handler */ |
1237 | char *argv[] = { NULL, xstrdup(G.traps[sig]), NULL }; |
1238 | save_rcode = G.last_exitcode; |
1239 | builtin_eval(argv); |
1240 | free(argv[1]); |
1241 | G.last_exitcode = save_rcode; |
1242 | } /* else: "" trap, ignoring signal */ |
1243 | continue; |
1244 | } |
1245 | /* not a trap: special action */ |
1246 | switch (sig) { |
1247 | #if ENABLE_HUSH_FAST |
1248 | case SIGCHLD: |
1249 | G.count_SIGCHLD++; |
1250 | //bb_error_msg("[%d] check_and_run_traps: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
1251 | break; |
1252 | #endif |
1253 | case SIGINT: |
1254 | /* Builtin was ^C'ed, make it look prettier: */ |
1255 | bb_putchar('\n'); |
1256 | G.flag_SIGINT = 1; |
1257 | break; |
1258 | #if ENABLE_HUSH_JOB |
1259 | case SIGHUP: { |
1260 | struct pipe *job; |
1261 | /* bash is observed to signal whole process groups, |
1262 | * not individual processes */ |
1263 | for (job = G.job_list; job; job = job->next) { |
1264 | if (job->pgrp <= 0) |
1265 | continue; |
1266 | debug_printf_exec("HUPing pgrp %d\n", job->pgrp); |
1267 | if (kill(- job->pgrp, SIGHUP) == 0) |
1268 | kill(- job->pgrp, SIGCONT); |
1269 | } |
1270 | sigexit(SIGHUP); |
1271 | } |
1272 | #endif |
1273 | default: /* ignored: */ |
1274 | /* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */ |
1275 | break; |
1276 | } |
1277 | } |
1278 | return last_sig; |
1279 | } |
1280 | |
1281 | |
1282 | static const char *get_cwd(int force) |
1283 | { |
1284 | if (force || G.cwd == NULL) { |
1285 | /* xrealloc_getcwd_or_warn(arg) calls free(arg), |
1286 | * we must not try to free(bb_msg_unknown) */ |
1287 | if (G.cwd == bb_msg_unknown) |
1288 | G.cwd = NULL; |
1289 | G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd); |
1290 | if (!G.cwd) |
1291 | G.cwd = bb_msg_unknown; |
1292 | } |
1293 | return G.cwd; |
1294 | } |
1295 | |
1296 | |
1297 | /* |
1298 | * Shell and environment variable support |
1299 | */ |
1300 | static struct variable **get_ptr_to_local_var(const char *name) |
1301 | { |
1302 | struct variable **pp; |
1303 | struct variable *cur; |
1304 | int len; |
1305 | |
1306 | len = strlen(name); |
1307 | pp = &G.top_var; |
1308 | while ((cur = *pp) != NULL) { |
1309 | if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=') |
1310 | return pp; |
1311 | pp = &cur->next; |
1312 | } |
1313 | return NULL; |
1314 | } |
1315 | |
1316 | static struct variable *get_local_var(const char *name) |
1317 | { |
1318 | struct variable **pp = get_ptr_to_local_var(name); |
1319 | if (pp) |
1320 | return *pp; |
1321 | return NULL; |
1322 | } |
1323 | |
1324 | static const char* FAST_FUNC get_local_var_value(const char *name) |
1325 | { |
1326 | struct variable **pp = get_ptr_to_local_var(name); |
1327 | if (pp) |
1328 | return strchr((*pp)->varstr, '=') + 1; |
1329 | if (strcmp(name, "PPID") == 0) |
1330 | return utoa(G.root_ppid); |
1331 | // bash compat: UID? EUID? |
1332 | #if ENABLE_HUSH_RANDOM_SUPPORT |
1333 | if (strcmp(name, "RANDOM") == 0) { |
1334 | return utoa(next_random(&G.random_gen)); |
1335 | } |
1336 | #endif |
1337 | return NULL; |
1338 | } |
1339 | |
1340 | /* str holds "NAME=VAL" and is expected to be malloced. |
1341 | * We take ownership of it. |
1342 | * flg_export: |
1343 | * 0: do not change export flag |
1344 | * (if creating new variable, flag will be 0) |
1345 | * 1: set export flag and putenv the variable |
1346 | * -1: clear export flag and unsetenv the variable |
1347 | * flg_read_only is set only when we handle -R var=val |
1348 | */ |
1349 | #if !BB_MMU && ENABLE_HUSH_LOCAL |
1350 | /* all params are used */ |
1351 | #elif BB_MMU && ENABLE_HUSH_LOCAL |
1352 | #define set_local_var(str, flg_export, local_lvl, flg_read_only) \ |
1353 | set_local_var(str, flg_export, local_lvl) |
1354 | #elif BB_MMU && !ENABLE_HUSH_LOCAL |
1355 | #define set_local_var(str, flg_export, local_lvl, flg_read_only) \ |
1356 | set_local_var(str, flg_export) |
1357 | #elif !BB_MMU && !ENABLE_HUSH_LOCAL |
1358 | #define set_local_var(str, flg_export, local_lvl, flg_read_only) \ |
1359 | set_local_var(str, flg_export, flg_read_only) |
1360 | #endif |
1361 | static int set_local_var(char *str, int flg_export, int local_lvl, int flg_read_only) |
1362 | { |
1363 | struct variable **var_pp; |
1364 | struct variable *cur; |
1365 | char *eq_sign; |
1366 | int name_len; |
1367 | |
1368 | eq_sign = strchr(str, '='); |
1369 | if (!eq_sign) { /* not expected to ever happen? */ |
1370 | free(str); |
1371 | return -1; |
1372 | } |
1373 | |
1374 | name_len = eq_sign - str + 1; /* including '=' */ |
1375 | var_pp = &G.top_var; |
1376 | while ((cur = *var_pp) != NULL) { |
1377 | if (strncmp(cur->varstr, str, name_len) != 0) { |
1378 | var_pp = &cur->next; |
1379 | continue; |
1380 | } |
1381 | /* We found an existing var with this name */ |
1382 | if (cur->flg_read_only) { |
1383 | #if !BB_MMU |
1384 | if (!flg_read_only) |
1385 | #endif |
1386 | bb_error_msg("%s: readonly variable", str); |
1387 | free(str); |
1388 | return -1; |
1389 | } |
1390 | if (flg_export == -1) { // "&& cur->flg_export" ? |
1391 | debug_printf_env("%s: unsetenv '%s'\n", __func__, str); |
1392 | *eq_sign = '\0'; |
1393 | unsetenv(str); |
1394 | *eq_sign = '='; |
1395 | } |
1396 | #if ENABLE_HUSH_LOCAL |
1397 | if (cur->func_nest_level < local_lvl) { |
1398 | /* New variable is declared as local, |
1399 | * and existing one is global, or local |
1400 | * from enclosing function. |
1401 | * Remove and save old one: */ |
1402 | *var_pp = cur->next; |
1403 | cur->next = *G.shadowed_vars_pp; |
1404 | *G.shadowed_vars_pp = cur; |
1405 | /* bash 3.2.33(1) and exported vars: |
1406 | * # export z=z |
1407 | * # f() { local z=a; env | grep ^z; } |
1408 | * # f |
1409 | * z=a |
1410 | * # env | grep ^z |
1411 | * z=z |
1412 | */ |
1413 | if (cur->flg_export) |
1414 | flg_export = 1; |
1415 | break; |
1416 | } |
1417 | #endif |
1418 | if (strcmp(cur->varstr + name_len, eq_sign + 1) == 0) { |
1419 | free_and_exp: |
1420 | free(str); |
1421 | goto exp; |
1422 | } |
1423 | if (cur->max_len != 0) { |
1424 | if (cur->max_len >= strlen(str)) { |
1425 | /* This one is from startup env, reuse space */ |
1426 | strcpy(cur->varstr, str); |
1427 | goto free_and_exp; |
1428 | } |
1429 | } else { |
1430 | /* max_len == 0 signifies "malloced" var, which we can |
1431 | * (and has to) free */ |
1432 | free(cur->varstr); |
1433 | } |
1434 | cur->max_len = 0; |
1435 | goto set_str_and_exp; |
1436 | } |
1437 | |
1438 | /* Not found - create new variable struct */ |
1439 | cur = xzalloc(sizeof(*cur)); |
1440 | #if ENABLE_HUSH_LOCAL |
1441 | cur->func_nest_level = local_lvl; |
1442 | #endif |
1443 | cur->next = *var_pp; |
1444 | *var_pp = cur; |
1445 | |
1446 | set_str_and_exp: |
1447 | cur->varstr = str; |
1448 | #if !BB_MMU |
1449 | cur->flg_read_only = flg_read_only; |
1450 | #endif |
1451 | exp: |
1452 | if (flg_export == 1) |
1453 | cur->flg_export = 1; |
1454 | if (name_len == 4 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S') |
1455 | cmdedit_update_prompt(); |
1456 | if (cur->flg_export) { |
1457 | if (flg_export == -1) { |
1458 | cur->flg_export = 0; |
1459 | /* unsetenv was already done */ |
1460 | } else { |
1461 | debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr); |
1462 | return putenv(cur->varstr); |
1463 | } |
1464 | } |
1465 | return 0; |
1466 | } |
1467 | |
1468 | /* Used at startup and after each cd */ |
1469 | static void set_pwd_var(int exp) |
1470 | { |
1471 | set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)), |
1472 | /*exp:*/ exp, /*lvl:*/ 0, /*ro:*/ 0); |
1473 | } |
1474 | |
1475 | static int unset_local_var_len(const char *name, int name_len) |
1476 | { |
1477 | struct variable *cur; |
1478 | struct variable **var_pp; |
1479 | |
1480 | if (!name) |
1481 | return EXIT_SUCCESS; |
1482 | var_pp = &G.top_var; |
1483 | while ((cur = *var_pp) != NULL) { |
1484 | if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') { |
1485 | if (cur->flg_read_only) { |
1486 | bb_error_msg("%s: readonly variable", name); |
1487 | return EXIT_FAILURE; |
1488 | } |
1489 | *var_pp = cur->next; |
1490 | debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr); |
1491 | bb_unsetenv(cur->varstr); |
1492 | if (name_len == 3 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S') |
1493 | cmdedit_update_prompt(); |
1494 | if (!cur->max_len) |
1495 | free(cur->varstr); |
1496 | free(cur); |
1497 | return EXIT_SUCCESS; |
1498 | } |
1499 | var_pp = &cur->next; |
1500 | } |
1501 | return EXIT_SUCCESS; |
1502 | } |
1503 | |
1504 | static int unset_local_var(const char *name) |
1505 | { |
1506 | return unset_local_var_len(name, strlen(name)); |
1507 | } |
1508 | |
1509 | static void unset_vars(char **strings) |
1510 | { |
1511 | char **v; |
1512 | |
1513 | if (!strings) |
1514 | return; |
1515 | v = strings; |
1516 | while (*v) { |
1517 | const char *eq = strchrnul(*v, '='); |
1518 | unset_local_var_len(*v, (int)(eq - *v)); |
1519 | v++; |
1520 | } |
1521 | free(strings); |
1522 | } |
1523 | |
1524 | #if ENABLE_SH_MATH_SUPPORT |
1525 | # define is_name(c) ((c) == '_' || isalpha((unsigned char)(c))) |
1526 | # define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c))) |
1527 | static char* FAST_FUNC endofname(const char *name) |
1528 | { |
1529 | char *p; |
1530 | |
1531 | p = (char *) name; |
1532 | if (!is_name(*p)) |
1533 | return p; |
1534 | while (*++p) { |
1535 | if (!is_in_name(*p)) |
1536 | break; |
1537 | } |
1538 | return p; |
1539 | } |
1540 | #endif |
1541 | |
1542 | static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val) |
1543 | { |
1544 | char *var = xasprintf("%s=%s", name, val); |
1545 | set_local_var(var, /*flags:*/ 0, /*lvl:*/ 0, /*ro:*/ 0); |
1546 | } |
1547 | |
1548 | |
1549 | /* |
1550 | * Helpers for "var1=val1 var2=val2 cmd" feature |
1551 | */ |
1552 | static void add_vars(struct variable *var) |
1553 | { |
1554 | struct variable *next; |
1555 | |
1556 | while (var) { |
1557 | next = var->next; |
1558 | var->next = G.top_var; |
1559 | G.top_var = var; |
1560 | if (var->flg_export) { |
1561 | debug_printf_env("%s: restoring exported '%s'\n", __func__, var->varstr); |
1562 | putenv(var->varstr); |
1563 | } else { |
1564 | debug_printf_env("%s: restoring variable '%s'\n", __func__, var->varstr); |
1565 | } |
1566 | var = next; |
1567 | } |
1568 | } |
1569 | |
1570 | static struct variable *set_vars_and_save_old(char **strings) |
1571 | { |
1572 | char **s; |
1573 | struct variable *old = NULL; |
1574 | |
1575 | if (!strings) |
1576 | return old; |
1577 | s = strings; |
1578 | while (*s) { |
1579 | struct variable *var_p; |
1580 | struct variable **var_pp; |
1581 | char *eq; |
1582 | |
1583 | eq = strchr(*s, '='); |
1584 | if (eq) { |
1585 | *eq = '\0'; |
1586 | var_pp = get_ptr_to_local_var(*s); |
1587 | *eq = '='; |
1588 | if (var_pp) { |
1589 | /* Remove variable from global linked list */ |
1590 | var_p = *var_pp; |
1591 | debug_printf_env("%s: removing '%s'\n", __func__, var_p->varstr); |
1592 | *var_pp = var_p->next; |
1593 | /* Add it to returned list */ |
1594 | var_p->next = old; |
1595 | old = var_p; |
1596 | } |
1597 | set_local_var(*s, /*exp:*/ 1, /*lvl:*/ 0, /*ro:*/ 0); |
1598 | } |
1599 | s++; |
1600 | } |
1601 | return old; |
1602 | } |
1603 | |
1604 | |
1605 | /* |
1606 | * in_str support |
1607 | */ |
1608 | static int FAST_FUNC static_get(struct in_str *i) |
1609 | { |
1610 | int ch = *i->p; |
1611 | if (ch != '\0') { |
1612 | i->p++; |
1613 | return ch; |
1614 | } |
1615 | return EOF; |
1616 | } |
1617 | |
1618 | static int FAST_FUNC static_peek(struct in_str *i) |
1619 | { |
1620 | return *i->p; |
1621 | } |
1622 | |
1623 | #if ENABLE_HUSH_INTERACTIVE |
1624 | |
1625 | static void cmdedit_update_prompt(void) |
1626 | { |
1627 | if (ENABLE_FEATURE_EDITING_FANCY_PROMPT) { |
1628 | G.PS1 = get_local_var_value("PS1"); |
1629 | if (G.PS1 == NULL) |
1630 | G.PS1 = "\\w \\$ "; |
1631 | G.PS2 = get_local_var_value("PS2"); |
1632 | } else { |
1633 | G.PS1 = NULL; |
1634 | } |
1635 | if (G.PS2 == NULL) |
1636 | G.PS2 = "> "; |
1637 | } |
1638 | |
1639 | static const char* setup_prompt_string(int promptmode) |
1640 | { |
1641 | const char *prompt_str; |
1642 | debug_printf("setup_prompt_string %d ", promptmode); |
1643 | if (!ENABLE_FEATURE_EDITING_FANCY_PROMPT) { |
1644 | /* Set up the prompt */ |
1645 | if (promptmode == 0) { /* PS1 */ |
1646 | free((char*)G.PS1); |
1647 | /* bash uses $PWD value, even if it is set by user. |
1648 | * It uses current dir only if PWD is unset. |
1649 | * We always use current dir. */ |
1650 | G.PS1 = xasprintf("%s %c ", get_cwd(0), (geteuid() != 0) ? '$' : '#'); |
1651 | prompt_str = G.PS1; |
1652 | } else |
1653 | prompt_str = G.PS2; |
1654 | } else |
1655 | prompt_str = (promptmode == 0) ? G.PS1 : G.PS2; |
1656 | debug_printf("result '%s'\n", prompt_str); |
1657 | return prompt_str; |
1658 | } |
1659 | |
1660 | static void get_user_input(struct in_str *i) |
1661 | { |
1662 | int r; |
1663 | const char *prompt_str; |
1664 | |
1665 | prompt_str = setup_prompt_string(i->promptmode); |
1666 | # if ENABLE_FEATURE_EDITING |
1667 | /* Enable command line editing only while a command line |
1668 | * is actually being read */ |
1669 | do { |
1670 | G.flag_SIGINT = 0; |
1671 | /* buglet: SIGINT will not make new prompt to appear _at once_, |
1672 | * only after <Enter>. (^C will work) */ |
1673 | r = read_line_input(prompt_str, G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1, G.line_input_state); |
1674 | /* catch *SIGINT* etc (^C is handled by read_line_input) */ |
1675 | check_and_run_traps(0); |
1676 | } while (r == 0 || G.flag_SIGINT); /* repeat if ^C or SIGINT */ |
1677 | i->eof_flag = (r < 0); |
1678 | if (i->eof_flag) { /* EOF/error detected */ |
1679 | G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */ |
1680 | G.user_input_buf[1] = '\0'; |
1681 | } |
1682 | # else |
1683 | do { |
1684 | G.flag_SIGINT = 0; |
1685 | fputs(prompt_str, stdout); |
1686 | fflush_all(); |
1687 | G.user_input_buf[0] = r = fgetc(i->file); |
1688 | /*G.user_input_buf[1] = '\0'; - already is and never changed */ |
1689 | //do we need check_and_run_traps(0)? (maybe only if stdin) |
1690 | } while (G.flag_SIGINT); |
1691 | i->eof_flag = (r == EOF); |
1692 | # endif |
1693 | i->p = G.user_input_buf; |
1694 | } |
1695 | |
1696 | #endif /* INTERACTIVE */ |
1697 | |
1698 | /* This is the magic location that prints prompts |
1699 | * and gets data back from the user */ |
1700 | static int FAST_FUNC file_get(struct in_str *i) |
1701 | { |
1702 | int ch; |
1703 | |
1704 | /* If there is data waiting, eat it up */ |
1705 | if (i->p && *i->p) { |
1706 | #if ENABLE_HUSH_INTERACTIVE |
1707 | take_cached: |
1708 | #endif |
1709 | ch = *i->p++; |
1710 | if (i->eof_flag && !*i->p) |
1711 | ch = EOF; |
1712 | /* note: ch is never NUL */ |
1713 | } else { |
1714 | /* need to double check i->file because we might be doing something |
1715 | * more complicated by now, like sourcing or substituting. */ |
1716 | #if ENABLE_HUSH_INTERACTIVE |
1717 | if (G_interactive_fd && i->promptme && i->file == stdin) { |
1718 | do { |
1719 | get_user_input(i); |
1720 | } while (!*i->p); /* need non-empty line */ |
1721 | i->promptmode = 1; /* PS2 */ |
1722 | i->promptme = 0; |
1723 | goto take_cached; |
1724 | } |
1725 | #endif |
1726 | do ch = fgetc(i->file); while (ch == '\0'); |
1727 | } |
1728 | debug_printf("file_get: got '%c' %d\n", ch, ch); |
1729 | #if ENABLE_HUSH_INTERACTIVE |
1730 | if (ch == '\n') |
1731 | i->promptme = 1; |
1732 | #endif |
1733 | return ch; |
1734 | } |
1735 | |
1736 | /* All callers guarantee this routine will never |
1737 | * be used right after a newline, so prompting is not needed. |
1738 | */ |
1739 | static int FAST_FUNC file_peek(struct in_str *i) |
1740 | { |
1741 | int ch; |
1742 | if (i->p && *i->p) { |
1743 | if (i->eof_flag && !i->p[1]) |
1744 | return EOF; |
1745 | return *i->p; |
1746 | /* note: ch is never NUL */ |
1747 | } |
1748 | do ch = fgetc(i->file); while (ch == '\0'); |
1749 | i->eof_flag = (ch == EOF); |
1750 | i->peek_buf[0] = ch; |
1751 | i->peek_buf[1] = '\0'; |
1752 | i->p = i->peek_buf; |
1753 | debug_printf("file_peek: got '%c' %d\n", ch, ch); |
1754 | return ch; |
1755 | } |
1756 | |
1757 | static void setup_file_in_str(struct in_str *i, FILE *f) |
1758 | { |
1759 | i->peek = file_peek; |
1760 | i->get = file_get; |
1761 | #if ENABLE_HUSH_INTERACTIVE |
1762 | i->promptme = 1; |
1763 | i->promptmode = 0; /* PS1 */ |
1764 | #endif |
1765 | i->file = f; |
1766 | i->p = NULL; |
1767 | } |
1768 | |
1769 | static void setup_string_in_str(struct in_str *i, const char *s) |
1770 | { |
1771 | i->peek = static_peek; |
1772 | i->get = static_get; |
1773 | #if ENABLE_HUSH_INTERACTIVE |
1774 | i->promptme = 1; |
1775 | i->promptmode = 0; /* PS1 */ |
1776 | #endif |
1777 | i->p = s; |
1778 | i->eof_flag = 0; |
1779 | } |
1780 | |
1781 | |
1782 | /* |
1783 | * o_string support |
1784 | */ |
1785 | #define B_CHUNK (32 * sizeof(char*)) |
1786 | |
1787 | static void o_reset_to_empty_unquoted(o_string *o) |
1788 | { |
1789 | o->length = 0; |
1790 | o->o_quoted = 0; |
1791 | if (o->data) |
1792 | o->data[0] = '\0'; |
1793 | } |
1794 | |
1795 | static void o_free(o_string *o) |
1796 | { |
1797 | free(o->data); |
1798 | memset(o, 0, sizeof(*o)); |
1799 | } |
1800 | |
1801 | static ALWAYS_INLINE void o_free_unsafe(o_string *o) |
1802 | { |
1803 | free(o->data); |
1804 | } |
1805 | |
1806 | static void o_grow_by(o_string *o, int len) |
1807 | { |
1808 | if (o->length + len > o->maxlen) { |
1809 | o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK); |
1810 | o->data = xrealloc(o->data, 1 + o->maxlen); |
1811 | } |
1812 | } |
1813 | |
1814 | static void o_addchr(o_string *o, int ch) |
1815 | { |
1816 | debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o); |
1817 | o_grow_by(o, 1); |
1818 | o->data[o->length] = ch; |
1819 | o->length++; |
1820 | o->data[o->length] = '\0'; |
1821 | } |
1822 | |
1823 | static void o_addblock(o_string *o, const char *str, int len) |
1824 | { |
1825 | o_grow_by(o, len); |
1826 | memcpy(&o->data[o->length], str, len); |
1827 | o->length += len; |
1828 | o->data[o->length] = '\0'; |
1829 | } |
1830 | |
1831 | static void o_addstr(o_string *o, const char *str) |
1832 | { |
1833 | o_addblock(o, str, strlen(str)); |
1834 | } |
1835 | |
1836 | #if !BB_MMU |
1837 | static void nommu_addchr(o_string *o, int ch) |
1838 | { |
1839 | if (o) |
1840 | o_addchr(o, ch); |
1841 | } |
1842 | #else |
1843 | # define nommu_addchr(o, str) ((void)0) |
1844 | #endif |
1845 | |
1846 | static void o_addstr_with_NUL(o_string *o, const char *str) |
1847 | { |
1848 | o_addblock(o, str, strlen(str) + 1); |
1849 | } |
1850 | |
1851 | static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len) |
1852 | { |
1853 | while (len) { |
1854 | o_addchr(o, *str); |
1855 | if (*str++ == '\\' |
1856 | // && (*str != '*' && *str != '?' && *str != '[') |
1857 | ) { |
1858 | o_addchr(o, '\\'); |
1859 | } |
1860 | len--; |
1861 | } |
1862 | } |
1863 | |
1864 | #undef HUSH_BRACE_EXP |
1865 | /* |
1866 | * HUSH_BRACE_EXP code needs corresponding quoting on variable expansion side. |
1867 | * Currently, "v='{q,w}'; echo $v" erroneously expands braces in $v. |
1868 | * Apparently, on unquoted $v bash still does globbing |
1869 | * ("v='*.txt'; echo $v" prints all .txt files), |
1870 | * but NOT brace expansion! Thus, there should be TWO independent |
1871 | * quoting mechanisms on $v expansion side: one protects |
1872 | * $v from brace expansion, and other additionally protects "$v" against globbing. |
1873 | * We have only second one. |
1874 | */ |
1875 | |
1876 | #ifdef HUSH_BRACE_EXP |
1877 | # define MAYBE_BRACES "{}" |
1878 | #else |
1879 | # define MAYBE_BRACES "" |
1880 | #endif |
1881 | |
1882 | /* My analysis of quoting semantics tells me that state information |
1883 | * is associated with a destination, not a source. |
1884 | */ |
1885 | static void o_addqchr(o_string *o, int ch) |
1886 | { |
1887 | int sz = 1; |
1888 | char *found = strchr("*?[\\" MAYBE_BRACES, ch); |
1889 | if (found) |
1890 | sz++; |
1891 | o_grow_by(o, sz); |
1892 | if (found) { |
1893 | o->data[o->length] = '\\'; |
1894 | o->length++; |
1895 | } |
1896 | o->data[o->length] = ch; |
1897 | o->length++; |
1898 | o->data[o->length] = '\0'; |
1899 | } |
1900 | |
1901 | static void o_addQchr(o_string *o, int ch) |
1902 | { |
1903 | int sz = 1; |
1904 | if (o->o_escape && strchr("*?[\\" MAYBE_BRACES, ch)) { |
1905 | sz++; |
1906 | o->data[o->length] = '\\'; |
1907 | o->length++; |
1908 | } |
1909 | o_grow_by(o, sz); |
1910 | o->data[o->length] = ch; |
1911 | o->length++; |
1912 | o->data[o->length] = '\0'; |
1913 | } |
1914 | |
1915 | static void o_addQstr(o_string *o, const char *str, int len) |
1916 | { |
1917 | if (!o->o_escape) { |
1918 | o_addblock(o, str, len); |
1919 | return; |
1920 | } |
1921 | while (len) { |
1922 | char ch; |
1923 | int sz; |
1924 | int ordinary_cnt = strcspn(str, "*?[\\" MAYBE_BRACES); |
1925 | if (ordinary_cnt > len) /* paranoia */ |
1926 | ordinary_cnt = len; |
1927 | o_addblock(o, str, ordinary_cnt); |
1928 | if (ordinary_cnt == len) |
1929 | return; |
1930 | str += ordinary_cnt; |
1931 | len -= ordinary_cnt + 1; /* we are processing + 1 char below */ |
1932 | |
1933 | ch = *str++; |
1934 | sz = 1; |
1935 | if (ch) { /* it is necessarily one of "*?[\\" MAYBE_BRACES */ |
1936 | sz++; |
1937 | o->data[o->length] = '\\'; |
1938 | o->length++; |
1939 | } |
1940 | o_grow_by(o, sz); |
1941 | o->data[o->length] = ch; |
1942 | o->length++; |
1943 | o->data[o->length] = '\0'; |
1944 | } |
1945 | } |
1946 | |
1947 | /* A special kind of o_string for $VAR and `cmd` expansion. |
1948 | * It contains char* list[] at the beginning, which is grown in 16 element |
1949 | * increments. Actual string data starts at the next multiple of 16 * (char*). |
1950 | * list[i] contains an INDEX (int!) into this string data. |
1951 | * It means that if list[] needs to grow, data needs to be moved higher up |
1952 | * but list[i]'s need not be modified. |
1953 | * NB: remembering how many list[i]'s you have there is crucial. |
1954 | * o_finalize_list() operation post-processes this structure - calculates |
1955 | * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well. |
1956 | */ |
1957 | #if DEBUG_EXPAND || DEBUG_GLOB |
1958 | static void debug_print_list(const char *prefix, o_string *o, int n) |
1959 | { |
1960 | char **list = (char**)o->data; |
1961 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); |
1962 | int i = 0; |
1963 | |
1964 | indent(); |
1965 | fprintf(stderr, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d\n", |
1966 | prefix, list, n, string_start, o->length, o->maxlen); |
1967 | while (i < n) { |
1968 | indent(); |
1969 | fprintf(stderr, " list[%d]=%d '%s' %p\n", i, (int)list[i], |
1970 | o->data + (int)list[i] + string_start, |
1971 | o->data + (int)list[i] + string_start); |
1972 | i++; |
1973 | } |
1974 | if (n) { |
1975 | const char *p = o->data + (int)list[n - 1] + string_start; |
1976 | indent(); |
1977 | fprintf(stderr, " total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data)); |
1978 | } |
1979 | } |
1980 | #else |
1981 | # define debug_print_list(prefix, o, n) ((void)0) |
1982 | #endif |
1983 | |
1984 | /* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value |
1985 | * in list[n] so that it points past last stored byte so far. |
1986 | * It returns n+1. */ |
1987 | static int o_save_ptr_helper(o_string *o, int n) |
1988 | { |
1989 | char **list = (char**)o->data; |
1990 | int string_start; |
1991 | int string_len; |
1992 | |
1993 | if (!o->has_empty_slot) { |
1994 | string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); |
1995 | string_len = o->length - string_start; |
1996 | if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */ |
1997 | debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start); |
1998 | /* list[n] points to string_start, make space for 16 more pointers */ |
1999 | o->maxlen += 0x10 * sizeof(list[0]); |
2000 | o->data = xrealloc(o->data, o->maxlen + 1); |
2001 | list = (char**)o->data; |
2002 | memmove(list + n + 0x10, list + n, string_len); |
2003 | o->length += 0x10 * sizeof(list[0]); |
2004 | } else { |
2005 | debug_printf_list("list[%d]=%d string_start=%d\n", |
2006 | n, string_len, string_start); |
2007 | } |
2008 | } else { |
2009 | /* We have empty slot at list[n], reuse without growth */ |
2010 | string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */ |
2011 | string_len = o->length - string_start; |
2012 | debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n", |
2013 | n, string_len, string_start); |
2014 | o->has_empty_slot = 0; |
2015 | } |
2016 | list[n] = (char*)(ptrdiff_t)string_len; |
2017 | return n + 1; |
2018 | } |
2019 | |
2020 | /* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */ |
2021 | static int o_get_last_ptr(o_string *o, int n) |
2022 | { |
2023 | char **list = (char**)o->data; |
2024 | int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); |
2025 | |
2026 | return ((int)(ptrdiff_t)list[n-1]) + string_start; |
2027 | } |
2028 | |
2029 | #ifdef HUSH_BRACE_EXP |
2030 | /* There in a GNU extension, GLOB_BRACE, but it is not usable: |
2031 | * first, it processes even {a} (no commas), second, |
2032 | * I didn't manage to make it return strings when they don't match |
2033 | * existing files. Need to re-implement it. |
2034 | */ |
2035 | |
2036 | /* Helper */ |
2037 | static int glob_needed(const char *s) |
2038 | { |
2039 | while (*s) { |
2040 | if (*s == '\\') { |
2041 | if (!s[1]) |
2042 | return 0; |
2043 | s += 2; |
2044 | continue; |
2045 | } |
2046 | if (*s == '*' || *s == '[' || *s == '?' || *s == '{') |
2047 | return 1; |
2048 | s++; |
2049 | } |
2050 | return 0; |
2051 | } |
2052 | /* Return pointer to next closing brace or to comma */ |
2053 | static const char *next_brace_sub(const char *cp) |
2054 | { |
2055 | unsigned depth = 0; |
2056 | cp++; |
2057 | while (*cp != '\0') { |
2058 | if (*cp == '\\') { |
2059 | if (*++cp == '\0') |
2060 | break; |
2061 | cp++; |
2062 | continue; |
2063 | } |
2064 | /*{*/ if ((*cp == '}' && depth-- == 0) || (*cp == ',' && depth == 0)) |
2065 | break; |
2066 | if (*cp++ == '{') /*}*/ |
2067 | depth++; |
2068 | } |
2069 | |
2070 | return *cp != '\0' ? cp : NULL; |
2071 | } |
2072 | /* Recursive brace globber. Note: may garble pattern[]. */ |
2073 | static int glob_brace(char *pattern, o_string *o, int n) |
2074 | { |
2075 | char *new_pattern_buf; |
2076 | const char *begin; |
2077 | const char *next; |
2078 | const char *rest; |
2079 | const char *p; |
2080 | size_t rest_len; |
2081 | |
2082 | debug_printf_glob("glob_brace('%s')\n", pattern); |
2083 | |
2084 | begin = pattern; |
2085 | while (1) { |
2086 | if (*begin == '\0') |
2087 | goto simple_glob; |
2088 | if (*begin == '{') /*}*/ { |
2089 | /* Find the first sub-pattern and at the same time |
2090 | * find the rest after the closing brace */ |
2091 | next = next_brace_sub(begin); |
2092 | if (next == NULL) { |
2093 | /* An illegal expression */ |
2094 | goto simple_glob; |
2095 | } |
2096 | /*{*/ if (*next == '}') { |
2097 | /* "{abc}" with no commas - illegal |
2098 | * brace expr, disregard and skip it */ |
2099 | begin = next + 1; |
2100 | continue; |
2101 | } |
2102 | break; |
2103 | } |
2104 | if (*begin == '\\' && begin[1] != '\0') |
2105 | begin++; |
2106 | begin++; |
2107 | } |
2108 | debug_printf_glob("begin:%s\n", begin); |
2109 | debug_printf_glob("next:%s\n", next); |
2110 | |
2111 | /* Now find the end of the whole brace expression */ |
2112 | rest = next; |
2113 | /*{*/ while (*rest != '}') { |
2114 | rest = next_brace_sub(rest); |
2115 | if (rest == NULL) { |
2116 | /* An illegal expression */ |
2117 | goto simple_glob; |
2118 | } |
2119 | debug_printf_glob("rest:%s\n", rest); |
2120 | } |
2121 | rest_len = strlen(++rest) + 1; |
2122 | |
2123 | /* We are sure the brace expression is well-formed */ |
2124 | |
2125 | /* Allocate working buffer large enough for our work */ |
2126 | new_pattern_buf = xmalloc(strlen(pattern)); |
2127 | |
2128 | /* We have a brace expression. BEGIN points to the opening {, |
2129 | * NEXT points past the terminator of the first element, and REST |
2130 | * points past the final }. We will accumulate result names from |
2131 | * recursive runs for each brace alternative in the buffer using |
2132 | * GLOB_APPEND. */ |
2133 | |
2134 | p = begin + 1; |
2135 | while (1) { |
2136 | /* Construct the new glob expression */ |
2137 | memcpy( |
2138 | mempcpy( |
2139 | mempcpy(new_pattern_buf, |
2140 | /* We know the prefix for all sub-patterns */ |
2141 | pattern, begin - pattern), |
2142 | p, next - p), |
2143 | rest, rest_len); |
2144 | |
2145 | /* Note: glob_brace() may garble new_pattern_buf[]. |
2146 | * That's why we re-copy prefix every time (1st memcpy above). |
2147 | */ |
2148 | n = glob_brace(new_pattern_buf, o, n); |
2149 | /*{*/ if (*next == '}') { |
2150 | /* We saw the last entry */ |
2151 | break; |
2152 | } |
2153 | p = next + 1; |
2154 | next = next_brace_sub(next); |
2155 | } |
2156 | free(new_pattern_buf); |
2157 | return n; |
2158 | |
2159 | simple_glob: |
2160 | { |
2161 | int gr; |
2162 | glob_t globdata; |
2163 | |
2164 | memset(&globdata, 0, sizeof(globdata)); |
2165 | gr = glob(pattern, 0, NULL, &globdata); |
2166 | debug_printf_glob("glob('%s'):%d\n", pattern, gr); |
2167 | if (gr != 0) { |
2168 | if (gr == GLOB_NOMATCH) { |
2169 | globfree(&globdata); |
2170 | /* NB: garbles parameter */ |
2171 | unbackslash(pattern); |
2172 | o_addstr_with_NUL(o, pattern); |
2173 | debug_printf_glob("glob pattern '%s' is literal\n", pattern); |
2174 | return o_save_ptr_helper(o, n); |
2175 | } |
2176 | if (gr == GLOB_NOSPACE) |
2177 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
2178 | /* GLOB_ABORTED? Only happens with GLOB_ERR flag, |
2179 | * but we didn't specify it. Paranoia again. */ |
2180 | bb_error_msg_and_die("glob error %d on '%s'", gr, pattern); |
2181 | } |
2182 | if (globdata.gl_pathv && globdata.gl_pathv[0]) { |
2183 | char **argv = globdata.gl_pathv; |
2184 | while (1) { |
2185 | o_addstr_with_NUL(o, *argv); |
2186 | n = o_save_ptr_helper(o, n); |
2187 | argv++; |
2188 | if (!*argv) |
2189 | break; |
2190 | } |
2191 | } |
2192 | globfree(&globdata); |
2193 | } |
2194 | return n; |
2195 | } |
2196 | /* Performs globbing on last list[], |
2197 | * saving each result as a new list[]. |
2198 | */ |
2199 | static int o_glob(o_string *o, int n) |
2200 | { |
2201 | char *pattern, *copy; |
2202 | |
2203 | debug_printf_glob("start o_glob: n:%d o->data:%p\n", n, o->data); |
2204 | if (!o->data) |
2205 | return o_save_ptr_helper(o, n); |
2206 | pattern = o->data + o_get_last_ptr(o, n); |
2207 | debug_printf_glob("glob pattern '%s'\n", pattern); |
2208 | if (!glob_needed(pattern)) { |
2209 | /* unbackslash last string in o in place, fix length */ |
2210 | o->length = unbackslash(pattern) - o->data; |
2211 | debug_printf_glob("glob pattern '%s' is literal\n", pattern); |
2212 | return o_save_ptr_helper(o, n); |
2213 | } |
2214 | |
2215 | copy = xstrdup(pattern); |
2216 | /* "forget" pattern in o */ |
2217 | o->length = pattern - o->data; |
2218 | n = glob_brace(copy, o, n); |
2219 | free(copy); |
2220 | if (DEBUG_GLOB) |
2221 | debug_print_list("o_glob returning", o, n); |
2222 | return n; |
2223 | } |
2224 | |
2225 | #else /* !HUSH_BRACE_EXP */ |
2226 | |
2227 | /* Helper */ |
2228 | static int glob_needed(const char *s) |
2229 | { |
2230 | while (*s) { |
2231 | if (*s == '\\') { |
2232 | if (!s[1]) |
2233 | return 0; |
2234 | s += 2; |
2235 | continue; |
2236 | } |
2237 | if (*s == '*' || *s == '[' || *s == '?') |
2238 | return 1; |
2239 | s++; |
2240 | } |
2241 | return 0; |
2242 | } |
2243 | /* Performs globbing on last list[], |
2244 | * saving each result as a new list[]. |
2245 | */ |
2246 | static int o_glob(o_string *o, int n) |
2247 | { |
2248 | glob_t globdata; |
2249 | int gr; |
2250 | char *pattern; |
2251 | |
2252 | debug_printf_glob("start o_glob: n:%d o->data:%p\n", n, o->data); |
2253 | if (!o->data) |
2254 | return o_save_ptr_helper(o, n); |
2255 | pattern = o->data + o_get_last_ptr(o, n); |
2256 | debug_printf_glob("glob pattern '%s'\n", pattern); |
2257 | if (!glob_needed(pattern)) { |
2258 | literal: |
2259 | /* unbackslash last string in o in place, fix length */ |
2260 | o->length = unbackslash(pattern) - o->data; |
2261 | debug_printf_glob("glob pattern '%s' is literal\n", pattern); |
2262 | return o_save_ptr_helper(o, n); |
2263 | } |
2264 | |
2265 | memset(&globdata, 0, sizeof(globdata)); |
2266 | /* Can't use GLOB_NOCHECK: it does not unescape the string. |
2267 | * If we glob "*.\*" and don't find anything, we need |
2268 | * to fall back to using literal "*.*", but GLOB_NOCHECK |
2269 | * will return "*.\*"! |
2270 | */ |
2271 | gr = glob(pattern, 0, NULL, &globdata); |
2272 | debug_printf_glob("glob('%s'):%d\n", pattern, gr); |
2273 | if (gr != 0) { |
2274 | if (gr == GLOB_NOMATCH) { |
2275 | globfree(&globdata); |
2276 | goto literal; |
2277 | } |
2278 | if (gr == GLOB_NOSPACE) |
2279 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
2280 | /* GLOB_ABORTED? Only happens with GLOB_ERR flag, |
2281 | * but we didn't specify it. Paranoia again. */ |
2282 | bb_error_msg_and_die("glob error %d on '%s'", gr, pattern); |
2283 | } |
2284 | if (globdata.gl_pathv && globdata.gl_pathv[0]) { |
2285 | char **argv = globdata.gl_pathv; |
2286 | /* "forget" pattern in o */ |
2287 | o->length = pattern - o->data; |
2288 | while (1) { |
2289 | o_addstr_with_NUL(o, *argv); |
2290 | n = o_save_ptr_helper(o, n); |
2291 | argv++; |
2292 | if (!*argv) |
2293 | break; |
2294 | } |
2295 | } |
2296 | globfree(&globdata); |
2297 | if (DEBUG_GLOB) |
2298 | debug_print_list("o_glob returning", o, n); |
2299 | return n; |
2300 | } |
2301 | |
2302 | #endif /* !HUSH_BRACE_EXP */ |
2303 | |
2304 | /* If o->o_glob == 1, glob the string so far remembered. |
2305 | * Otherwise, just finish current list[] and start new */ |
2306 | static int o_save_ptr(o_string *o, int n) |
2307 | { |
2308 | if (o->o_glob) { /* if globbing is requested */ |
2309 | /* If o->has_empty_slot, list[n] was already globbed |
2310 | * (if it was requested back then when it was filled) |
2311 | * so don't do that again! */ |
2312 | if (!o->has_empty_slot) |
2313 | return o_glob(o, n); /* o_save_ptr_helper is inside */ |
2314 | } |
2315 | return o_save_ptr_helper(o, n); |
2316 | } |
2317 | |
2318 | /* "Please convert list[n] to real char* ptrs, and NULL terminate it." */ |
2319 | static char **o_finalize_list(o_string *o, int n) |
2320 | { |
2321 | char **list; |
2322 | int string_start; |
2323 | |
2324 | n = o_save_ptr(o, n); /* force growth for list[n] if necessary */ |
2325 | if (DEBUG_EXPAND) |
2326 | debug_print_list("finalized", o, n); |
2327 | debug_printf_expand("finalized n:%d\n", n); |
2328 | list = (char**)o->data; |
2329 | string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]); |
2330 | list[--n] = NULL; |
2331 | while (n) { |
2332 | n--; |
2333 | list[n] = o->data + (int)(ptrdiff_t)list[n] + string_start; |
2334 | } |
2335 | return list; |
2336 | } |
2337 | |
2338 | |
2339 | /* Expansion can recurse */ |
2340 | #if ENABLE_HUSH_TICK |
2341 | static int process_command_subs(o_string *dest, const char *s); |
2342 | #endif |
2343 | static char *expand_string_to_string(const char *str); |
2344 | #if BB_MMU |
2345 | #define parse_stream_dquoted(as_string, dest, input, dquote_end) \ |
2346 | parse_stream_dquoted(dest, input, dquote_end) |
2347 | #endif |
2348 | static int parse_stream_dquoted(o_string *as_string, |
2349 | o_string *dest, |
2350 | struct in_str *input, |
2351 | int dquote_end); |
2352 | |
2353 | /* expand_strvec_to_strvec() takes a list of strings, expands |
2354 | * all variable references within and returns a pointer to |
2355 | * a list of expanded strings, possibly with larger number |
2356 | * of strings. (Think VAR="a b"; echo $VAR). |
2357 | * This new list is allocated as a single malloc block. |
2358 | * NULL-terminated list of char* pointers is at the beginning of it, |
2359 | * followed by strings themself. |
2360 | * Caller can deallocate entire list by single free(list). */ |
2361 | |
2362 | /* Store given string, finalizing the word and starting new one whenever |
2363 | * we encounter IFS char(s). This is used for expanding variable values. |
2364 | * End-of-string does NOT finalize word: think about 'echo -$VAR-' */ |
2365 | static int expand_on_ifs(o_string *output, int n, const char *str) |
2366 | { |
2367 | while (1) { |
2368 | int word_len = strcspn(str, G.ifs); |
2369 | if (word_len) { |
2370 | if (output->o_escape || !output->o_glob) |
2371 | o_addQstr(output, str, word_len); |
2372 | else /* protect backslashes against globbing up :) */ |
2373 | o_addblock_duplicate_backslash(output, str, word_len); |
2374 | str += word_len; |
2375 | } |
2376 | if (!*str) /* EOL - do not finalize word */ |
2377 | break; |
2378 | o_addchr(output, '\0'); |
2379 | debug_print_list("expand_on_ifs", output, n); |
2380 | n = o_save_ptr(output, n); |
2381 | str += strspn(str, G.ifs); /* skip ifs chars */ |
2382 | } |
2383 | debug_print_list("expand_on_ifs[1]", output, n); |
2384 | return n; |
2385 | } |
2386 | |
2387 | /* Helper to expand $((...)) and heredoc body. These act as if |
2388 | * they are in double quotes, with the exception that they are not :). |
2389 | * Just the rules are similar: "expand only $var and `cmd`" |
2390 | * |
2391 | * Returns malloced string. |
2392 | * As an optimization, we return NULL if expansion is not needed. |
2393 | */ |
2394 | static char *expand_pseudo_dquoted(const char *str) |
2395 | { |
2396 | char *exp_str; |
2397 | struct in_str input; |
2398 | o_string dest = NULL_O_STRING; |
2399 | |
2400 | if (strchr(str, '$') == NULL |
2401 | #if ENABLE_HUSH_TICK |
2402 | && strchr(str, '`') == NULL |
2403 | #endif |
2404 | ) { |
2405 | return NULL; |
2406 | } |
2407 | |
2408 | /* We need to expand. Example: |
2409 | * echo $(($a + `echo 1`)) $((1 + $((2)) )) |
2410 | */ |
2411 | setup_string_in_str(&input, str); |
2412 | parse_stream_dquoted(NULL, &dest, &input, EOF); |
2413 | //bb_error_msg("'%s' -> '%s'", str, dest.data); |
2414 | exp_str = expand_string_to_string(dest.data); |
2415 | //bb_error_msg("'%s' -> '%s'", dest.data, exp_str); |
2416 | o_free_unsafe(&dest); |
2417 | return exp_str; |
2418 | } |
2419 | |
2420 | #if ENABLE_SH_MATH_SUPPORT |
2421 | static arith_t expand_and_evaluate_arith(const char *arg, int *errcode_p) |
2422 | { |
2423 | arith_eval_hooks_t hooks; |
2424 | arith_t res; |
2425 | char *exp_str; |
2426 | |
2427 | hooks.lookupvar = get_local_var_value; |
2428 | hooks.setvar = set_local_var_from_halves; |
2429 | hooks.endofname = endofname; |
2430 | exp_str = expand_pseudo_dquoted(arg); |
2431 | res = arith(exp_str ? exp_str : arg, errcode_p, &hooks); |
2432 | free(exp_str); |
2433 | return res; |
2434 | } |
2435 | #endif |
2436 | |
2437 | /* Expand all variable references in given string, adding words to list[] |
2438 | * at n, n+1,... positions. Return updated n (so that list[n] is next one |
2439 | * to be filled). This routine is extremely tricky: has to deal with |
2440 | * variables/parameters with whitespace, $* and $@, and constructs like |
2441 | * 'echo -$*-'. If you play here, you must run testsuite afterwards! */ |
2442 | static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask) |
2443 | { |
2444 | /* or_mask is either 0 (normal case) or 0x80 - |
2445 | * expansion of right-hand side of assignment == 1-element expand. |
2446 | * It will also do no globbing, and thus we must not backslash-quote! |
2447 | */ |
2448 | char ored_ch; |
2449 | char *p; |
2450 | |
2451 | ored_ch = 0; |
2452 | |
2453 | debug_printf_expand("expand_vars_to_list: arg:'%s' or_mask:%x\n", arg, or_mask); |
2454 | debug_print_list("expand_vars_to_list", output, n); |
2455 | n = o_save_ptr(output, n); |
2456 | debug_print_list("expand_vars_to_list[0]", output, n); |
2457 | |
2458 | while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) { |
2459 | char first_ch; |
2460 | int i; |
2461 | char *to_be_freed = NULL; |
2462 | const char *val = NULL; |
2463 | #if ENABLE_HUSH_TICK |
2464 | o_string subst_result = NULL_O_STRING; |
2465 | #endif |
2466 | #if ENABLE_SH_MATH_SUPPORT |
2467 | char arith_buf[sizeof(arith_t)*3 + 2]; |
2468 | #endif |
2469 | o_addblock(output, arg, p - arg); |
2470 | debug_print_list("expand_vars_to_list[1]", output, n); |
2471 | arg = ++p; |
2472 | p = strchr(p, SPECIAL_VAR_SYMBOL); |
2473 | |
2474 | first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */ |
2475 | /* "$@" is special. Even if quoted, it can still |
2476 | * expand to nothing (not even an empty string) */ |
2477 | if ((first_ch & 0x7f) != '@') |
2478 | ored_ch |= first_ch; |
2479 | |
2480 | switch (first_ch & 0x7f) { |
2481 | /* Highest bit in first_ch indicates that var is double-quoted */ |
2482 | case '*': |
2483 | case '@': |
2484 | i = 1; |
2485 | if (!G.global_argv[i]) |
2486 | break; |
2487 | ored_ch |= first_ch; /* do it for "$@" _now_, when we know it's not empty */ |
2488 | if (!(first_ch & 0x80)) { /* unquoted $* or $@ */ |
2489 | smallint sv = output->o_escape; |
2490 | /* unquoted var's contents should be globbed, so don't escape */ |
2491 | output->o_escape = 0; |
2492 | while (G.global_argv[i]) { |
2493 | n = expand_on_ifs(output, n, G.global_argv[i]); |
2494 | debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1); |
2495 | if (G.global_argv[i++][0] && G.global_argv[i]) { |
2496 | /* this argv[] is not empty and not last: |
2497 | * put terminating NUL, start new word */ |
2498 | o_addchr(output, '\0'); |
2499 | debug_print_list("expand_vars_to_list[2]", output, n); |
2500 | n = o_save_ptr(output, n); |
2501 | debug_print_list("expand_vars_to_list[3]", output, n); |
2502 | } |
2503 | } |
2504 | output->o_escape = sv; |
2505 | } else |
2506 | /* If or_mask is nonzero, we handle assignment 'a=....$@.....' |
2507 | * and in this case should treat it like '$*' - see 'else...' below */ |
2508 | if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */ |
2509 | while (1) { |
2510 | o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i])); |
2511 | if (++i >= G.global_argc) |
2512 | break; |
2513 | o_addchr(output, '\0'); |
2514 | debug_print_list("expand_vars_to_list[4]", output, n); |
2515 | n = o_save_ptr(output, n); |
2516 | } |
2517 | } else { /* quoted $*: add as one word */ |
2518 | while (1) { |
2519 | o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i])); |
2520 | if (!G.global_argv[++i]) |
2521 | break; |
2522 | if (G.ifs[0]) |
2523 | o_addchr(output, G.ifs[0]); |
2524 | } |
2525 | } |
2526 | break; |
2527 | case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */ |
2528 | /* "Empty variable", used to make "" etc to not disappear */ |
2529 | arg++; |
2530 | ored_ch = 0x80; |
2531 | break; |
2532 | #if ENABLE_HUSH_TICK |
2533 | case '`': /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */ |
2534 | *p = '\0'; |
2535 | arg++; |
2536 | /* Can't just stuff it into output o_string, |
2537 | * expanded result may need to be globbed |
2538 | * and $IFS-splitted */ |
2539 | debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch); |
2540 | G.last_exitcode = process_command_subs(&subst_result, arg); |
2541 | debug_printf_subst("SUBST RES:%d '%s'\n", G.last_exitcode, subst_result.data); |
2542 | val = subst_result.data; |
2543 | goto store_val; |
2544 | #endif |
2545 | #if ENABLE_SH_MATH_SUPPORT |
2546 | case '+': { /* <SPECIAL_VAR_SYMBOL>+cmd<SPECIAL_VAR_SYMBOL> */ |
2547 | arith_t res; |
2548 | int errcode; |
2549 | |
2550 | arg++; /* skip '+' */ |
2551 | *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */ |
2552 | debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch); |
2553 | res = expand_and_evaluate_arith(arg, &errcode); |
2554 | |
2555 | if (errcode < 0) { |
2556 | const char *msg = "error in arithmetic"; |
2557 | switch (errcode) { |
2558 | case -3: |
2559 | msg = "exponent less than 0"; |
2560 | break; |
2561 | case -2: |
2562 | msg = "divide by 0"; |
2563 | break; |
2564 | case -5: |
2565 | msg = "expression recursion loop detected"; |
2566 | break; |
2567 | } |
2568 | die_if_script(msg); |
2569 | } |
2570 | debug_printf_subst("ARITH RES '"arith_t_fmt"'\n", res); |
2571 | sprintf(arith_buf, arith_t_fmt, res); |
2572 | val = arith_buf; |
2573 | break; |
2574 | } |
2575 | #endif |
2576 | default: { /* <SPECIAL_VAR_SYMBOL>varname<SPECIAL_VAR_SYMBOL> */ |
2577 | char *var; |
2578 | char first_char; |
2579 | char exp_op; |
2580 | char exp_save = exp_save; /* for compiler */ |
2581 | char *exp_saveptr; /* points to expansion operator */ |
2582 | char *exp_word = exp_word; /* for compiler */ |
2583 | |
2584 | var = arg; |
2585 | *p = '\0'; |
2586 | exp_saveptr = arg[1] ? strchr("%#:-=+?", arg[1]) : NULL; |
2587 | first_char = arg[0] = first_ch & 0x7f; |
2588 | exp_op = 0; |
2589 | |
2590 | if (first_char == '#' && arg[1] && !exp_saveptr) { |
2591 | /* handle length expansion ${#var} */ |
2592 | var++; |
2593 | exp_op = 'L'; |
2594 | } else { |
2595 | /* maybe handle parameter expansion */ |
2596 | if (exp_saveptr /* if 2nd char is one of expansion operators */ |
2597 | && strchr(NUMERIC_SPECVARS_STR, first_char) /* 1st char is special variable */ |
2598 | ) { |
2599 | /* ${?:0}, ${#[:]%0} etc */ |
2600 | exp_saveptr = var + 1; |
2601 | } else { |
2602 | /* ${?}, ${var}, ${var:0}, ${var[:]%0} etc */ |
2603 | exp_saveptr = var+1 + strcspn(var+1, "%#:-=+?"); |
2604 | } |
2605 | exp_op = exp_save = *exp_saveptr; |
2606 | if (exp_op) { |
2607 | exp_word = exp_saveptr + 1; |
2608 | if (exp_op == ':') { |
2609 | exp_op = *exp_word++; |
2610 | if (ENABLE_HUSH_BASH_COMPAT |
2611 | && (exp_op == '\0' || !strchr("%#:-=+?"+3, exp_op)) |
2612 | ) { |
2613 | /* oops... it's ${var:N[:M]}, not ${var:?xxx} or some such */ |
2614 | exp_op = ':'; |
2615 | exp_word--; |
2616 | } |
2617 | } |
2618 | *exp_saveptr = '\0'; |
2619 | } /* else: it's not an expansion op, but bare ${var} */ |
2620 | } |
2621 | |
2622 | /* lookup the variable in question */ |
2623 | if (isdigit(var[0])) { |
2624 | /* parse_dollar() should have vetted var for us */ |
2625 | i = xatoi_u(var); |
2626 | if (i < G.global_argc) |
2627 | val = G.global_argv[i]; |
2628 | /* else val remains NULL: $N with too big N */ |
2629 | } else { |
2630 | switch (var[0]) { |
2631 | case '$': /* pid */ |
2632 | val = utoa(G.root_pid); |
2633 | break; |
2634 | case '!': /* bg pid */ |
2635 | val = G.last_bg_pid ? utoa(G.last_bg_pid) : (char*)""; |
2636 | break; |
2637 | case '?': /* exitcode */ |
2638 | val = utoa(G.last_exitcode); |
2639 | break; |
2640 | case '#': /* argc */ |
2641 | val = utoa(G.global_argc ? G.global_argc-1 : 0); |
2642 | break; |
2643 | default: |
2644 | val = get_local_var_value(var); |
2645 | } |
2646 | } |
2647 | |
2648 | /* handle any expansions */ |
2649 | if (exp_op == 'L') { |
2650 | debug_printf_expand("expand: length(%s)=", val); |
2651 | val = utoa(val ? strlen(val) : 0); |
2652 | debug_printf_expand("%s\n", val); |
2653 | } else if (exp_op) { |
2654 | if (exp_op == '%' || exp_op == '#') { |
2655 | /* Standard-mandated substring removal ops: |
2656 | * ${parameter%word} - remove smallest suffix pattern |
2657 | * ${parameter%%word} - remove largest suffix pattern |
2658 | * ${parameter#word} - remove smallest prefix pattern |
2659 | * ${parameter##word} - remove largest prefix pattern |
2660 | * |
2661 | * Word is expanded to produce a glob pattern. |
2662 | * Then var's value is matched to it and matching part removed. |
2663 | */ |
2664 | if (val) { |
2665 | bool match_at_left; |
2666 | char *loc; |
2667 | scan_t scan = pick_scan(exp_op, *exp_word, &match_at_left); |
2668 | if (exp_op == *exp_word) /* ## or %% */ |
2669 | exp_word++; |
2670 | val = to_be_freed = xstrdup(val); |
2671 | { |
2672 | char *exp_exp_word = expand_pseudo_dquoted(exp_word); |
2673 | if (exp_exp_word) |
2674 | exp_word = exp_exp_word; |
2675 | loc = scan(to_be_freed, exp_word, match_at_left); |
2676 | //bb_error_msg("op:%c str:'%s' pat:'%s' res:'%s'", |
2677 | // exp_op, to_be_freed, exp_word, loc); |
2678 | free(exp_exp_word); |
2679 | } |
2680 | if (loc) { /* match was found */ |
2681 | if (match_at_left) /* # or ## */ |
2682 | val = loc; |
2683 | else /* % or %% */ |
2684 | *loc = '\0'; |
2685 | } |
2686 | } |
2687 | } else if (exp_op == ':') { |
2688 | #if ENABLE_HUSH_BASH_COMPAT && ENABLE_SH_MATH_SUPPORT |
2689 | /* It's ${var:N[:M]} bashism. |
2690 | * Note that in encoded form it has TWO parts: |
2691 | * var:N<SPECIAL_VAR_SYMBOL>M<SPECIAL_VAR_SYMBOL> |
2692 | */ |
2693 | arith_t beg, len; |
2694 | int errcode = 0; |
2695 | |
2696 | beg = expand_and_evaluate_arith(exp_word, &errcode); |
2697 | debug_printf_varexp("beg:'%s'=%lld\n", exp_word, (long long)beg); |
2698 | *p++ = SPECIAL_VAR_SYMBOL; |
2699 | exp_word = p; |
2700 | p = strchr(p, SPECIAL_VAR_SYMBOL); |
2701 | *p = '\0'; |
2702 | len = expand_and_evaluate_arith(exp_word, &errcode); |
2703 | debug_printf_varexp("len:'%s'=%lld\n", exp_word, (long long)len); |
2704 | |
2705 | if (errcode >= 0 && len >= 0) { /* bash compat: len < 0 is illegal */ |
2706 | if (beg < 0) /* bash compat */ |
2707 | beg = 0; |
2708 | debug_printf_varexp("from val:'%s'\n", val); |
2709 | if (len == 0 || !val || beg >= strlen(val)) |
2710 | val = ""; |
2711 | else { |
2712 | /* Paranoia. What if user entered 9999999999999 |
2713 | * which fits in arith_t but not int? */ |
2714 | if (len >= INT_MAX) |
2715 | len = INT_MAX; |
2716 | val = to_be_freed = xstrndup(val + beg, len); |
2717 | } |
2718 | debug_printf_varexp("val:'%s'\n", val); |
2719 | } else |
2720 | #endif |
2721 | { |
2722 | die_if_script("malformed ${%s:...}", var); |
2723 | val = ""; |
2724 | } |
2725 | } else { /* one of "-=+?" */ |
2726 | /* Standard-mandated substitution ops: |
2727 | * ${var?word} - indicate error if unset |
2728 | * If var is unset, word (or a message indicating it is unset |
2729 | * if word is null) is written to standard error |
2730 | * and the shell exits with a non-zero exit status. |
2731 | * Otherwise, the value of var is substituted. |
2732 | * ${var-word} - use default value |
2733 | * If var is unset, word is substituted. |
2734 | * ${var=word} - assign and use default value |
2735 | * If var is unset, word is assigned to var. |
2736 | * In all cases, final value of var is substituted. |
2737 | * ${var+word} - use alternative value |
2738 | * If var is unset, null is substituted. |
2739 | * Otherwise, word is substituted. |
2740 | * |
2741 | * Word is subjected to tilde expansion, parameter expansion, |
2742 | * command substitution, and arithmetic expansion. |
2743 | * If word is not needed, it is not expanded. |
2744 | * |
2745 | * Colon forms (${var:-word}, ${var:=word} etc) do the same, |
2746 | * but also treat null var as if it is unset. |
2747 | */ |
2748 | int use_word = (!val || ((exp_save == ':') && !val[0])); |
2749 | if (exp_op == '+') |
2750 | use_word = !use_word; |
2751 | debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op, |
2752 | (exp_save == ':') ? "true" : "false", use_word); |
2753 | if (use_word) { |
2754 | to_be_freed = expand_pseudo_dquoted(exp_word); |
2755 | if (to_be_freed) |
2756 | exp_word = to_be_freed; |
2757 | if (exp_op == '?') { |
2758 | /* mimic bash message */ |
2759 | die_if_script("%s: %s", |
2760 | var, |
2761 | exp_word[0] ? exp_word : "parameter null or not set" |
2762 | ); |
2763 | //TODO: how interactive bash aborts expansion mid-command? |
2764 | } else { |
2765 | val = exp_word; |
2766 | } |
2767 | |
2768 | if (exp_op == '=') { |
2769 | /* ${var=[word]} or ${var:=[word]} */ |
2770 | if (isdigit(var[0]) || var[0] == '#') { |
2771 | /* mimic bash message */ |
2772 | die_if_script("$%s: cannot assign in this way", var); |
2773 | val = NULL; |
2774 | } else { |
2775 | char *new_var = xasprintf("%s=%s", var, val); |
2776 | set_local_var(new_var, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0); |
2777 | } |
2778 | } |
2779 | } |
2780 | } /* one of "-=+?" */ |
2781 | |
2782 | *exp_saveptr = exp_save; |
2783 | } /* if (exp_op) */ |
2784 | |
2785 | arg[0] = first_ch; |
2786 | #if ENABLE_HUSH_TICK |
2787 | store_val: |
2788 | #endif |
2789 | if (!(first_ch & 0x80)) { /* unquoted $VAR */ |
2790 | debug_printf_expand("unquoted '%s', output->o_escape:%d\n", val, output->o_escape); |
2791 | if (val) { |
2792 | /* unquoted var's contents should be globbed, so don't escape */ |
2793 | smallint sv = output->o_escape; |
2794 | output->o_escape = 0; |
2795 | n = expand_on_ifs(output, n, val); |
2796 | val = NULL; |
2797 | output->o_escape = sv; |
2798 | } |
2799 | } else { /* quoted $VAR, val will be appended below */ |
2800 | debug_printf_expand("quoted '%s', output->o_escape:%d\n", val, output->o_escape); |
2801 | } |
2802 | } /* default: */ |
2803 | } /* switch (char after <SPECIAL_VAR_SYMBOL>) */ |
2804 | |
2805 | if (val) { |
2806 | o_addQstr(output, val, strlen(val)); |
2807 | } |
2808 | free(to_be_freed); |
2809 | /* Do the check to avoid writing to a const string */ |
2810 | if (*p != SPECIAL_VAR_SYMBOL) |
2811 | *p = SPECIAL_VAR_SYMBOL; |
2812 | |
2813 | #if ENABLE_HUSH_TICK |
2814 | o_free(&subst_result); |
2815 | #endif |
2816 | arg = ++p; |
2817 | } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */ |
2818 | |
2819 | if (arg[0]) { |
2820 | debug_print_list("expand_vars_to_list[a]", output, n); |
2821 | /* this part is literal, and it was already pre-quoted |
2822 | * if needed (much earlier), do not use o_addQstr here! */ |
2823 | o_addstr_with_NUL(output, arg); |
2824 | debug_print_list("expand_vars_to_list[b]", output, n); |
2825 | } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */ |
2826 | && !(ored_ch & 0x80) /* and all vars were not quoted. */ |
2827 | ) { |
2828 | n--; |
2829 | /* allow to reuse list[n] later without re-growth */ |
2830 | output->has_empty_slot = 1; |
2831 | } else { |
2832 | o_addchr(output, '\0'); |
2833 | } |
2834 | return n; |
2835 | } |
2836 | |
2837 | enum { |
2838 | EXPVAR_FLAG_GLOB = 0x200, |
2839 | EXPVAR_FLAG_ESCAPE_VARS = 0x100, |
2840 | EXPVAR_FLAG_SINGLEWORD = 0x80, /* must be 0x80 */ |
2841 | }; |
2842 | static char **expand_variables(char **argv, unsigned or_mask) |
2843 | { |
2844 | int n; |
2845 | char **list; |
2846 | char **v; |
2847 | o_string output = NULL_O_STRING; |
2848 | |
2849 | /* protect against globbing for "$var"? */ |
2850 | /* (unquoted $var will temporarily switch it off) */ |
2851 | output.o_escape = 1 & (or_mask / EXPVAR_FLAG_ESCAPE_VARS); |
2852 | output.o_glob = 1 & (or_mask / EXPVAR_FLAG_GLOB); |
2853 | |
2854 | n = 0; |
2855 | v = argv; |
2856 | while (*v) { |
2857 | n = expand_vars_to_list(&output, n, *v, (unsigned char)or_mask); |
2858 | v++; |
2859 | } |
2860 | debug_print_list("expand_variables", &output, n); |
2861 | |
2862 | /* output.data (malloced in one block) gets returned in "list" */ |
2863 | list = o_finalize_list(&output, n); |
2864 | debug_print_strings("expand_variables[1]", list); |
2865 | return list; |
2866 | } |
2867 | |
2868 | static char **expand_strvec_to_strvec(char **argv) |
2869 | { |
2870 | return expand_variables(argv, EXPVAR_FLAG_GLOB | EXPVAR_FLAG_ESCAPE_VARS); |
2871 | } |
2872 | |
2873 | #if ENABLE_HUSH_BASH_COMPAT |
2874 | static char **expand_strvec_to_strvec_singleword_noglob(char **argv) |
2875 | { |
2876 | return expand_variables(argv, EXPVAR_FLAG_SINGLEWORD); |
2877 | } |
2878 | #endif |
2879 | |
2880 | #ifdef CMD_SINGLEWORD_NOGLOB_COND |
2881 | static char **expand_strvec_to_strvec_singleword_noglob_cond(char **argv) |
2882 | { |
2883 | int n; |
2884 | char **list; |
2885 | char **v; |
2886 | o_string output = NULL_O_STRING; |
2887 | |
2888 | n = 0; |
2889 | v = argv; |
2890 | while (*v) { |
2891 | int is_var = is_well_formed_var_name(*v, '='); |
2892 | /* is_var * 0x80: singleword expansion for vars */ |
2893 | n = expand_vars_to_list(&output, n, *v, is_var * 0x80); |
2894 | |
2895 | /* Subtle! expand_vars_to_list did not glob last word yet. |
2896 | * It does this only when fed with further data. |
2897 | * Therefore we set globbing flags AFTER it, not before: |
2898 | */ |
2899 | |
2900 | /* if it is not recognizably abc=...; then: */ |
2901 | output.o_escape = !is_var; /* protect against globbing for "$var" */ |
2902 | /* (unquoted $var will temporarily switch it off) */ |
2903 | output.o_glob = !is_var; /* and indeed do globbing */ |
2904 | v++; |
2905 | } |
2906 | debug_print_list("expand_cond", &output, n); |
2907 | |
2908 | /* output.data (malloced in one block) gets returned in "list" */ |
2909 | list = o_finalize_list(&output, n); |
2910 | debug_print_strings("expand_cond[1]", list); |
2911 | return list; |
2912 | } |
2913 | #endif |
2914 | |
2915 | /* Used for expansion of right hand of assignments */ |
2916 | /* NB: should NOT do globbing! |
2917 | * "export v=/bin/c*; env | grep ^v=" outputs "v=/bin/c*" */ |
2918 | static char *expand_string_to_string(const char *str) |
2919 | { |
2920 | char *argv[2], **list; |
2921 | |
2922 | argv[0] = (char*)str; |
2923 | argv[1] = NULL; |
2924 | list = expand_variables(argv, EXPVAR_FLAG_ESCAPE_VARS | EXPVAR_FLAG_SINGLEWORD); |
2925 | if (HUSH_DEBUG) |
2926 | if (!list[0] || list[1]) |
2927 | bb_error_msg_and_die("BUG in varexp2"); |
2928 | /* actually, just move string 2*sizeof(char*) bytes back */ |
2929 | overlapping_strcpy((char*)list, list[0]); |
2930 | unbackslash((char*)list); |
2931 | debug_printf_expand("string_to_string='%s'\n", (char*)list); |
2932 | return (char*)list; |
2933 | } |
2934 | |
2935 | /* Used for "eval" builtin */ |
2936 | static char* expand_strvec_to_string(char **argv) |
2937 | { |
2938 | char **list; |
2939 | |
2940 | list = expand_variables(argv, EXPVAR_FLAG_SINGLEWORD); |
2941 | /* Convert all NULs to spaces */ |
2942 | if (list[0]) { |
2943 | int n = 1; |
2944 | while (list[n]) { |
2945 | if (HUSH_DEBUG) |
2946 | if (list[n-1] + strlen(list[n-1]) + 1 != list[n]) |
2947 | bb_error_msg_and_die("BUG in varexp3"); |
2948 | /* bash uses ' ' regardless of $IFS contents */ |
2949 | list[n][-1] = ' '; |
2950 | n++; |
2951 | } |
2952 | } |
2953 | overlapping_strcpy((char*)list, list[0]); |
2954 | debug_printf_expand("strvec_to_string='%s'\n", (char*)list); |
2955 | return (char*)list; |
2956 | } |
2957 | |
2958 | static char **expand_assignments(char **argv, int count) |
2959 | { |
2960 | int i; |
2961 | char **p = NULL; |
2962 | /* Expand assignments into one string each */ |
2963 | for (i = 0; i < count; i++) { |
2964 | p = add_string_to_strings(p, expand_string_to_string(argv[i])); |
2965 | } |
2966 | return p; |
2967 | } |
2968 | |
2969 | |
2970 | #if BB_MMU |
2971 | /* never called */ |
2972 | void re_execute_shell(char ***to_free, const char *s, |
2973 | char *g_argv0, char **g_argv, |
2974 | char **builtin_argv) NORETURN; |
2975 | |
2976 | static void reset_traps_to_defaults(void) |
2977 | { |
2978 | /* This function is always called in a child shell |
2979 | * after fork (not vfork, NOMMU doesn't use this function). |
2980 | */ |
2981 | unsigned sig; |
2982 | unsigned mask; |
2983 | |
2984 | /* Child shells are not interactive. |
2985 | * SIGTTIN/SIGTTOU/SIGTSTP should not have special handling. |
2986 | * Testcase: (while :; do :; done) + ^Z should background. |
2987 | * Same goes for SIGTERM, SIGHUP, SIGINT. |
2988 | */ |
2989 | if (!G.traps && !(G.non_DFL_mask & SPECIAL_INTERACTIVE_SIGS)) |
2990 | return; /* already no traps and no SPECIAL_INTERACTIVE_SIGS */ |
2991 | |
2992 | /* Switching off SPECIAL_INTERACTIVE_SIGS. |
2993 | * Stupid. It can be done with *single* &= op, but we can't use |
2994 | * the fact that G.blocked_set is implemented as a bitmask |
2995 | * in libc... */ |
2996 | mask = (SPECIAL_INTERACTIVE_SIGS >> 1); |
2997 | sig = 1; |
2998 | while (1) { |
2999 | if (mask & 1) { |
3000 | /* Careful. Only if no trap or trap is not "" */ |
3001 | if (!G.traps || !G.traps[sig] || G.traps[sig][0]) |
3002 | sigdelset(&G.blocked_set, sig); |
3003 | } |
3004 | mask >>= 1; |
3005 | if (!mask) |
3006 | break; |
3007 | sig++; |
3008 | } |
3009 | /* Our homegrown sig mask is saner to work with :) */ |
3010 | G.non_DFL_mask &= ~SPECIAL_INTERACTIVE_SIGS; |
3011 | |
3012 | /* Resetting all traps to default except empty ones */ |
3013 | mask = G.non_DFL_mask; |
3014 | if (G.traps) for (sig = 0; sig < NSIG; sig++, mask >>= 1) { |
3015 | if (!G.traps[sig] || !G.traps[sig][0]) |
3016 | continue; |
3017 | free(G.traps[sig]); |
3018 | G.traps[sig] = NULL; |
3019 | /* There is no signal for 0 (EXIT) */ |
3020 | if (sig == 0) |
3021 | continue; |
3022 | /* There was a trap handler, we just removed it. |
3023 | * But if sig still has non-DFL handling, |
3024 | * we should not unblock the sig. */ |
3025 | if (mask & 1) |
3026 | continue; |
3027 | sigdelset(&G.blocked_set, sig); |
3028 | } |
3029 | sigprocmask(SIG_SETMASK, &G.blocked_set, NULL); |
3030 | } |
3031 | |
3032 | #else /* !BB_MMU */ |
3033 | |
3034 | static void re_execute_shell(char ***to_free, const char *s, |
3035 | char *g_argv0, char **g_argv, |
3036 | char **builtin_argv) NORETURN; |
3037 | static void re_execute_shell(char ***to_free, const char *s, |
3038 | char *g_argv0, char **g_argv, |
3039 | char **builtin_argv) |
3040 | { |
3041 | # define NOMMU_HACK_FMT ("-$%x:%x:%x:%x:%x:%llx" IF_HUSH_LOOPS(":%x")) |
3042 | /* delims + 2 * (number of bytes in printed hex numbers) */ |
3043 | char param_buf[sizeof(NOMMU_HACK_FMT) + 2 * (sizeof(int)*6 + sizeof(long long)*1)]; |
3044 | char *heredoc_argv[4]; |
3045 | struct variable *cur; |
3046 | # if ENABLE_HUSH_FUNCTIONS |
3047 | struct function *funcp; |
3048 | # endif |
3049 | char **argv, **pp; |
3050 | unsigned cnt; |
3051 | unsigned long long empty_trap_mask; |
3052 | |
3053 | if (!g_argv0) { /* heredoc */ |
3054 | argv = heredoc_argv; |
3055 | argv[0] = (char *) G.argv0_for_re_execing; |
3056 | argv[1] = (char *) "-<"; |
3057 | argv[2] = (char *) s; |
3058 | argv[3] = NULL; |
3059 | pp = &argv[3]; /* used as pointer to empty environment */ |
3060 | goto do_exec; |
3061 | } |
3062 | |
3063 | cnt = 0; |
3064 | pp = builtin_argv; |
3065 | if (pp) while (*pp++) |
3066 | cnt++; |
3067 | |
3068 | empty_trap_mask = 0; |
3069 | if (G.traps) { |
3070 | int sig; |
3071 | for (sig = 1; sig < NSIG; sig++) { |
3072 | if (G.traps[sig] && !G.traps[sig][0]) |
3073 | empty_trap_mask |= 1LL << sig; |
3074 | } |
3075 | } |
3076 | |
3077 | sprintf(param_buf, NOMMU_HACK_FMT |
3078 | , (unsigned) G.root_pid |
3079 | , (unsigned) G.root_ppid |
3080 | , (unsigned) G.last_bg_pid |
3081 | , (unsigned) G.last_exitcode |
3082 | , cnt |
3083 | , empty_trap_mask |
3084 | IF_HUSH_LOOPS(, G.depth_of_loop) |
3085 | ); |
3086 | # undef NOMMU_HACK_FMT |
3087 | /* 1:hush 2:-$<pid>:<pid>:<exitcode>:<etc...> <vars...> <funcs...> |
3088 | * 3:-c 4:<cmd> 5:<arg0> <argN...> 6:NULL |
3089 | */ |
3090 | cnt += 6; |
3091 | for (cur = G.top_var; cur; cur = cur->next) { |
3092 | if (!cur->flg_export || cur->flg_read_only) |
3093 | cnt += 2; |
3094 | } |
3095 | # if ENABLE_HUSH_FUNCTIONS |
3096 | for (funcp = G.top_func; funcp; funcp = funcp->next) |
3097 | cnt += 3; |
3098 | # endif |
3099 | pp = g_argv; |
3100 | while (*pp++) |
3101 | cnt++; |
3102 | *to_free = argv = pp = xzalloc(sizeof(argv[0]) * cnt); |
3103 | *pp++ = (char *) G.argv0_for_re_execing; |
3104 | *pp++ = param_buf; |
3105 | for (cur = G.top_var; cur; cur = cur->next) { |
3106 | if (cur->varstr == hush_version_str) |
3107 | continue; |
3108 | if (cur->flg_read_only) { |
3109 | *pp++ = (char *) "-R"; |
3110 | *pp++ = cur->varstr; |
3111 | } else if (!cur->flg_export) { |
3112 | *pp++ = (char *) "-V"; |
3113 | *pp++ = cur->varstr; |
3114 | } |
3115 | } |
3116 | # if ENABLE_HUSH_FUNCTIONS |
3117 | for (funcp = G.top_func; funcp; funcp = funcp->next) { |
3118 | *pp++ = (char *) "-F"; |
3119 | *pp++ = funcp->name; |
3120 | *pp++ = funcp->body_as_string; |
3121 | } |
3122 | # endif |
3123 | /* We can pass activated traps here. Say, -Tnn:trap_string |
3124 | * |
3125 | * However, POSIX says that subshells reset signals with traps |
3126 | * to SIG_DFL. |
3127 | * I tested bash-3.2 and it not only does that with true subshells |
3128 | * of the form ( list ), but with any forked children shells. |
3129 | * I set trap "echo W" WINCH; and then tried: |
3130 | * |
3131 | * { echo 1; sleep 20; echo 2; } & |
3132 | * while true; do echo 1; sleep 20; echo 2; break; done & |
3133 | * true | { echo 1; sleep 20; echo 2; } | cat |
3134 | * |
3135 | * In all these cases sending SIGWINCH to the child shell |
3136 | * did not run the trap. If I add trap "echo V" WINCH; |
3137 | * _inside_ group (just before echo 1), it works. |
3138 | * |
3139 | * I conclude it means we don't need to pass active traps here. |
3140 | * Even if we would use signal handlers instead of signal masking |
3141 | * in order to implement trap handling, |
3142 | * exec syscall below resets signals to SIG_DFL for us. |
3143 | */ |
3144 | *pp++ = (char *) "-c"; |
3145 | *pp++ = (char *) s; |
3146 | if (builtin_argv) { |
3147 | while (*++builtin_argv) |
3148 | *pp++ = *builtin_argv; |
3149 | *pp++ = (char *) ""; |
3150 | } |
3151 | *pp++ = g_argv0; |
3152 | while (*g_argv) |
3153 | *pp++ = *g_argv++; |
3154 | /* *pp = NULL; - is already there */ |
3155 | pp = environ; |
3156 | |
3157 | do_exec: |
3158 | debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s); |
3159 | sigprocmask(SIG_SETMASK, &G.inherited_set, NULL); |
3160 | execve(bb_busybox_exec_path, argv, pp); |
3161 | /* Fallback. Useful for init=/bin/hush usage etc */ |
3162 | if (argv[0][0] == '/') |
3163 | execve(argv[0], argv, pp); |
3164 | xfunc_error_retval = 127; |
3165 | bb_error_msg_and_die("can't re-execute the shell"); |
3166 | } |
3167 | #endif /* !BB_MMU */ |
3168 | |
3169 | |
3170 | static void setup_heredoc(struct redir_struct *redir) |
3171 | { |
3172 | struct fd_pair pair; |
3173 | pid_t pid; |
3174 | int len, written; |
3175 | /* the _body_ of heredoc (misleading field name) */ |
3176 | const char *heredoc = redir->rd_filename; |
3177 | char *expanded; |
3178 | #if !BB_MMU |
3179 | char **to_free; |
3180 | #endif |
3181 | |
3182 | expanded = NULL; |
3183 | if (!(redir->rd_dup & HEREDOC_QUOTED)) { |
3184 | expanded = expand_pseudo_dquoted(heredoc); |
3185 | if (expanded) |
3186 | heredoc = expanded; |
3187 | } |
3188 | len = strlen(heredoc); |
3189 | |
3190 | close(redir->rd_fd); /* often saves dup2+close in xmove_fd */ |
3191 | xpiped_pair(pair); |
3192 | xmove_fd(pair.rd, redir->rd_fd); |
3193 | |
3194 | /* Try writing without forking. Newer kernels have |
3195 | * dynamically growing pipes. Must use non-blocking write! */ |
3196 | ndelay_on(pair.wr); |
3197 | while (1) { |
3198 | written = write(pair.wr, heredoc, len); |
3199 | if (written <= 0) |
3200 | break; |
3201 | len -= written; |
3202 | if (len == 0) { |
3203 | close(pair.wr); |
3204 | free(expanded); |
3205 | return; |
3206 | } |
3207 | heredoc += written; |
3208 | } |
3209 | ndelay_off(pair.wr); |
3210 | |
3211 | /* Okay, pipe buffer was not big enough */ |
3212 | /* Note: we must not create a stray child (bastard? :) |
3213 | * for the unsuspecting parent process. Child creates a grandchild |
3214 | * and exits before parent execs the process which consumes heredoc |
3215 | * (that exec happens after we return from this function) */ |
3216 | #if !BB_MMU |
3217 | to_free = NULL; |
3218 | #endif |
3219 | pid = xvfork(); |
3220 | if (pid == 0) { |
3221 | /* child */ |
3222 | disable_restore_tty_pgrp_on_exit(); |
3223 | pid = BB_MMU ? xfork() : xvfork(); |
3224 | if (pid != 0) |
3225 | _exit(0); |
3226 | /* grandchild */ |
3227 | close(redir->rd_fd); /* read side of the pipe */ |
3228 | #if BB_MMU |
3229 | full_write(pair.wr, heredoc, len); /* may loop or block */ |
3230 | _exit(0); |
3231 | #else |
3232 | /* Delegate blocking writes to another process */ |
3233 | xmove_fd(pair.wr, STDOUT_FILENO); |
3234 | re_execute_shell(&to_free, heredoc, NULL, NULL, NULL); |
3235 | #endif |
3236 | } |
3237 | /* parent */ |
3238 | #if ENABLE_HUSH_FAST |
3239 | G.count_SIGCHLD++; |
3240 | //bb_error_msg("[%d] fork in setup_heredoc: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
3241 | #endif |
3242 | enable_restore_tty_pgrp_on_exit(); |
3243 | #if !BB_MMU |
3244 | free(to_free); |
3245 | #endif |
3246 | close(pair.wr); |
3247 | free(expanded); |
3248 | wait(NULL); /* wait till child has died */ |
3249 | } |
3250 | |
3251 | /* squirrel != NULL means we squirrel away copies of stdin, stdout, |
3252 | * and stderr if they are redirected. */ |
3253 | static int setup_redirects(struct command *prog, int squirrel[]) |
3254 | { |
3255 | int openfd, mode; |
3256 | struct redir_struct *redir; |
3257 | |
3258 | for (redir = prog->redirects; redir; redir = redir->next) { |
3259 | if (redir->rd_type == REDIRECT_HEREDOC2) { |
3260 | /* rd_fd<<HERE case */ |
3261 | if (squirrel && redir->rd_fd < 3 |
3262 | && squirrel[redir->rd_fd] < 0 |
3263 | ) { |
3264 | squirrel[redir->rd_fd] = dup(redir->rd_fd); |
3265 | } |
3266 | /* for REDIRECT_HEREDOC2, rd_filename holds _contents_ |
3267 | * of the heredoc */ |
3268 | debug_printf_parse("set heredoc '%s'\n", |
3269 | redir->rd_filename); |
3270 | setup_heredoc(redir); |
3271 | continue; |
3272 | } |
3273 | |
3274 | if (redir->rd_dup == REDIRFD_TO_FILE) { |
3275 | /* rd_fd<*>file case (<*> is <,>,>>,<>) */ |
3276 | char *p; |
3277 | if (redir->rd_filename == NULL) { |
3278 | /* Something went wrong in the parse. |
3279 | * Pretend it didn't happen */ |
3280 | bb_error_msg("bug in redirect parse"); |
3281 | continue; |
3282 | } |
3283 | mode = redir_table[redir->rd_type].mode; |
3284 | p = expand_string_to_string(redir->rd_filename); |
3285 | openfd = open_or_warn(p, mode); |
3286 | free(p); |
3287 | if (openfd < 0) { |
3288 | /* this could get lost if stderr has been redirected, but |
3289 | * bash and ash both lose it as well (though zsh doesn't!) */ |
3290 | //what the above comment tries to say? |
3291 | return 1; |
3292 | } |
3293 | } else { |
3294 | /* rd_fd<*>rd_dup or rd_fd<*>- cases */ |
3295 | openfd = redir->rd_dup; |
3296 | } |
3297 | |
3298 | if (openfd != redir->rd_fd) { |
3299 | if (squirrel && redir->rd_fd < 3 |
3300 | && squirrel[redir->rd_fd] < 0 |
3301 | ) { |
3302 | squirrel[redir->rd_fd] = dup(redir->rd_fd); |
3303 | } |
3304 | if (openfd == REDIRFD_CLOSE) { |
3305 | /* "n>-" means "close me" */ |
3306 | close(redir->rd_fd); |
3307 | } else { |
3308 | xdup2(openfd, redir->rd_fd); |
3309 | if (redir->rd_dup == REDIRFD_TO_FILE) |
3310 | close(openfd); |
3311 | } |
3312 | } |
3313 | } |
3314 | return 0; |
3315 | } |
3316 | |
3317 | static void restore_redirects(int squirrel[]) |
3318 | { |
3319 | int i, fd; |
3320 | for (i = 0; i < 3; i++) { |
3321 | fd = squirrel[i]; |
3322 | if (fd != -1) { |
3323 | /* We simply die on error */ |
3324 | xmove_fd(fd, i); |
3325 | } |
3326 | } |
3327 | } |
3328 | |
3329 | |
3330 | static void free_pipe_list(struct pipe *head); |
3331 | |
3332 | /* Return code is the exit status of the pipe */ |
3333 | static void free_pipe(struct pipe *pi) |
3334 | { |
3335 | char **p; |
3336 | struct command *command; |
3337 | struct redir_struct *r, *rnext; |
3338 | int a, i; |
3339 | |
3340 | if (pi->stopped_cmds > 0) /* why? */ |
3341 | return; |
3342 | debug_printf_clean("run pipe: (pid %d)\n", getpid()); |
3343 | for (i = 0; i < pi->num_cmds; i++) { |
3344 | command = &pi->cmds[i]; |
3345 | debug_printf_clean(" command %d:\n", i); |
3346 | if (command->argv) { |
3347 | for (a = 0, p = command->argv; *p; a++, p++) { |
3348 | debug_printf_clean(" argv[%d] = %s\n", a, *p); |
3349 | } |
3350 | free_strings(command->argv); |
3351 | command->argv = NULL; |
3352 | } |
3353 | /* not "else if": on syntax error, we may have both! */ |
3354 | if (command->group) { |
3355 | debug_printf_clean(" begin group (cmd_type:%d)\n", |
3356 | command->cmd_type); |
3357 | free_pipe_list(command->group); |
3358 | debug_printf_clean(" end group\n"); |
3359 | command->group = NULL; |
3360 | } |
3361 | /* else is crucial here. |
3362 | * If group != NULL, child_func is meaningless */ |
3363 | #if ENABLE_HUSH_FUNCTIONS |
3364 | else if (command->child_func) { |
3365 | debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func); |
3366 | command->child_func->parent_cmd = NULL; |
3367 | } |
3368 | #endif |
3369 | #if !BB_MMU |
3370 | free(command->group_as_string); |
3371 | command->group_as_string = NULL; |
3372 | #endif |
3373 | for (r = command->redirects; r; r = rnext) { |
3374 | debug_printf_clean(" redirect %d%s", |
3375 | r->rd_fd, redir_table[r->rd_type].descrip); |
3376 | /* guard against the case >$FOO, where foo is unset or blank */ |
3377 | if (r->rd_filename) { |
3378 | debug_printf_clean(" fname:'%s'\n", r->rd_filename); |
3379 | free(r->rd_filename); |
3380 | r->rd_filename = NULL; |
3381 | } |
3382 | debug_printf_clean(" rd_dup:%d\n", r->rd_dup); |
3383 | rnext = r->next; |
3384 | free(r); |
3385 | } |
3386 | command->redirects = NULL; |
3387 | } |
3388 | free(pi->cmds); /* children are an array, they get freed all at once */ |
3389 | pi->cmds = NULL; |
3390 | #if ENABLE_HUSH_JOB |
3391 | free(pi->cmdtext); |
3392 | pi->cmdtext = NULL; |
3393 | #endif |
3394 | } |
3395 | |
3396 | static void free_pipe_list(struct pipe *head) |
3397 | { |
3398 | struct pipe *pi, *next; |
3399 | |
3400 | for (pi = head; pi; pi = next) { |
3401 | #if HAS_KEYWORDS |
3402 | debug_printf_clean(" pipe reserved word %d\n", pi->res_word); |
3403 | #endif |
3404 | free_pipe(pi); |
3405 | debug_printf_clean("pipe followup code %d\n", pi->followup); |
3406 | next = pi->next; |
3407 | /*pi->next = NULL;*/ |
3408 | free(pi); |
3409 | } |
3410 | } |
3411 | |
3412 | |
3413 | static int run_list(struct pipe *pi); |
3414 | #if BB_MMU |
3415 | #define parse_stream(pstring, input, end_trigger) \ |
3416 | parse_stream(input, end_trigger) |
3417 | #endif |
3418 | static struct pipe *parse_stream(char **pstring, |
3419 | struct in_str *input, |
3420 | int end_trigger); |
3421 | static void parse_and_run_string(const char *s); |
3422 | |
3423 | |
3424 | static char *find_in_path(const char *arg) |
3425 | { |
3426 | char *ret = NULL; |
3427 | const char *PATH = get_local_var_value("PATH"); |
3428 | |
3429 | if (!PATH) |
3430 | return NULL; |
3431 | |
3432 | while (1) { |
3433 | const char *end = strchrnul(PATH, ':'); |
3434 | int sz = end - PATH; /* must be int! */ |
3435 | |
3436 | free(ret); |
3437 | if (sz != 0) { |
3438 | ret = xasprintf("%.*s/%s", sz, PATH, arg); |
3439 | } else { |
3440 | /* We have xxx::yyyy in $PATH, |
3441 | * it means "use current dir" */ |
3442 | ret = xstrdup(arg); |
3443 | } |
3444 | if (access(ret, F_OK) == 0) |
3445 | break; |
3446 | |
3447 | if (*end == '\0') { |
3448 | free(ret); |
3449 | return NULL; |
3450 | } |
3451 | PATH = end + 1; |
3452 | } |
3453 | |
3454 | return ret; |
3455 | } |
3456 | |
3457 | static const struct built_in_command* find_builtin_helper(const char *name, |
3458 | const struct built_in_command *x, |
3459 | const struct built_in_command *end) |
3460 | { |
3461 | while (x != end) { |
3462 | if (strcmp(name, x->b_cmd) != 0) { |
3463 | x++; |
3464 | continue; |
3465 | } |
3466 | debug_printf_exec("found builtin '%s'\n", name); |
3467 | return x; |
3468 | } |
3469 | return NULL; |
3470 | } |
3471 | static const struct built_in_command* find_builtin1(const char *name) |
3472 | { |
3473 | return find_builtin_helper(name, bltins1, &bltins1[ARRAY_SIZE(bltins1)]); |
3474 | } |
3475 | static const struct built_in_command* find_builtin(const char *name) |
3476 | { |
3477 | const struct built_in_command *x = find_builtin1(name); |
3478 | if (x) |
3479 | return x; |
3480 | return find_builtin_helper(name, bltins2, &bltins2[ARRAY_SIZE(bltins2)]); |
3481 | } |
3482 | |
3483 | #if ENABLE_HUSH_FUNCTIONS |
3484 | static struct function **find_function_slot(const char *name) |
3485 | { |
3486 | struct function **funcpp = &G.top_func; |
3487 | while (*funcpp) { |
3488 | if (strcmp(name, (*funcpp)->name) == 0) { |
3489 | break; |
3490 | } |
3491 | funcpp = &(*funcpp)->next; |
3492 | } |
3493 | return funcpp; |
3494 | } |
3495 | |
3496 | static const struct function *find_function(const char *name) |
3497 | { |
3498 | const struct function *funcp = *find_function_slot(name); |
3499 | if (funcp) |
3500 | debug_printf_exec("found function '%s'\n", name); |
3501 | return funcp; |
3502 | } |
3503 | |
3504 | /* Note: takes ownership on name ptr */ |
3505 | static struct function *new_function(char *name) |
3506 | { |
3507 | struct function **funcpp = find_function_slot(name); |
3508 | struct function *funcp = *funcpp; |
3509 | |
3510 | if (funcp != NULL) { |
3511 | struct command *cmd = funcp->parent_cmd; |
3512 | debug_printf_exec("func %p parent_cmd %p\n", funcp, cmd); |
3513 | if (!cmd) { |
3514 | debug_printf_exec("freeing & replacing function '%s'\n", funcp->name); |
3515 | free(funcp->name); |
3516 | /* Note: if !funcp->body, do not free body_as_string! |
3517 | * This is a special case of "-F name body" function: |
3518 | * body_as_string was not malloced! */ |
3519 | if (funcp->body) { |
3520 | free_pipe_list(funcp->body); |
3521 | # if !BB_MMU |
3522 | free(funcp->body_as_string); |
3523 | # endif |
3524 | } |
3525 | } else { |
3526 | debug_printf_exec("reinserting in tree & replacing function '%s'\n", funcp->name); |
3527 | cmd->argv[0] = funcp->name; |
3528 | cmd->group = funcp->body; |
3529 | # if !BB_MMU |
3530 | cmd->group_as_string = funcp->body_as_string; |
3531 | # endif |
3532 | } |
3533 | } else { |
3534 | debug_printf_exec("remembering new function '%s'\n", name); |
3535 | funcp = *funcpp = xzalloc(sizeof(*funcp)); |
3536 | /*funcp->next = NULL;*/ |
3537 | } |
3538 | |
3539 | funcp->name = name; |
3540 | return funcp; |
3541 | } |
3542 | |
3543 | static void unset_func(const char *name) |
3544 | { |
3545 | struct function **funcpp = find_function_slot(name); |
3546 | struct function *funcp = *funcpp; |
3547 | |
3548 | if (funcp != NULL) { |
3549 | debug_printf_exec("freeing function '%s'\n", funcp->name); |
3550 | *funcpp = funcp->next; |
3551 | /* funcp is unlinked now, deleting it. |
3552 | * Note: if !funcp->body, the function was created by |
3553 | * "-F name body", do not free ->body_as_string |
3554 | * and ->name as they were not malloced. */ |
3555 | if (funcp->body) { |
3556 | free_pipe_list(funcp->body); |
3557 | free(funcp->name); |
3558 | # if !BB_MMU |
3559 | free(funcp->body_as_string); |
3560 | # endif |
3561 | } |
3562 | free(funcp); |
3563 | } |
3564 | } |
3565 | |
3566 | # if BB_MMU |
3567 | #define exec_function(to_free, funcp, argv) \ |
3568 | exec_function(funcp, argv) |
3569 | # endif |
3570 | static void exec_function(char ***to_free, |
3571 | const struct function *funcp, |
3572 | char **argv) NORETURN; |
3573 | static void exec_function(char ***to_free, |
3574 | const struct function *funcp, |
3575 | char **argv) |
3576 | { |
3577 | # if BB_MMU |
3578 | int n = 1; |
3579 | |
3580 | argv[0] = G.global_argv[0]; |
3581 | G.global_argv = argv; |
3582 | while (*++argv) |
3583 | n++; |
3584 | G.global_argc = n; |
3585 | /* On MMU, funcp->body is always non-NULL */ |
3586 | n = run_list(funcp->body); |
3587 | fflush_all(); |
3588 | _exit(n); |
3589 | # else |
3590 | re_execute_shell(to_free, |
3591 | funcp->body_as_string, |
3592 | G.global_argv[0], |
3593 | argv + 1, |
3594 | NULL); |
3595 | # endif |
3596 | } |
3597 | |
3598 | static int run_function(const struct function *funcp, char **argv) |
3599 | { |
3600 | int rc; |
3601 | save_arg_t sv; |
3602 | smallint sv_flg; |
3603 | |
3604 | save_and_replace_G_args(&sv, argv); |
3605 | |
3606 | /* "we are in function, ok to use return" */ |
3607 | sv_flg = G.flag_return_in_progress; |
3608 | G.flag_return_in_progress = -1; |
3609 | # if ENABLE_HUSH_LOCAL |
3610 | G.func_nest_level++; |
3611 | # endif |
3612 | |
3613 | /* On MMU, funcp->body is always non-NULL */ |
3614 | # if !BB_MMU |
3615 | if (!funcp->body) { |
3616 | /* Function defined by -F */ |
3617 | parse_and_run_string(funcp->body_as_string); |
3618 | rc = G.last_exitcode; |
3619 | } else |
3620 | # endif |
3621 | { |
3622 | rc = run_list(funcp->body); |
3623 | } |
3624 | |
3625 | # if ENABLE_HUSH_LOCAL |
3626 | { |
3627 | struct variable *var; |
3628 | struct variable **var_pp; |
3629 | |
3630 | var_pp = &G.top_var; |
3631 | while ((var = *var_pp) != NULL) { |
3632 | if (var->func_nest_level < G.func_nest_level) { |
3633 | var_pp = &var->next; |
3634 | continue; |
3635 | } |
3636 | /* Unexport */ |
3637 | if (var->flg_export) |
3638 | bb_unsetenv(var->varstr); |
3639 | /* Remove from global list */ |
3640 | *var_pp = var->next; |
3641 | /* Free */ |
3642 | if (!var->max_len) |
3643 | free(var->varstr); |
3644 | free(var); |
3645 | } |
3646 | G.func_nest_level--; |
3647 | } |
3648 | # endif |
3649 | G.flag_return_in_progress = sv_flg; |
3650 | |
3651 | restore_G_args(&sv, argv); |
3652 | |
3653 | return rc; |
3654 | } |
3655 | #endif /* ENABLE_HUSH_FUNCTIONS */ |
3656 | |
3657 | |
3658 | #if BB_MMU |
3659 | #define exec_builtin(to_free, x, argv) \ |
3660 | exec_builtin(x, argv) |
3661 | #else |
3662 | #define exec_builtin(to_free, x, argv) \ |
3663 | exec_builtin(to_free, argv) |
3664 | #endif |
3665 | static void exec_builtin(char ***to_free, |
3666 | const struct built_in_command *x, |
3667 | char **argv) NORETURN; |
3668 | static void exec_builtin(char ***to_free, |
3669 | const struct built_in_command *x, |
3670 | char **argv) |
3671 | { |
3672 | #if BB_MMU |
3673 | int rcode = x->b_function(argv); |
3674 | fflush_all(); |
3675 | _exit(rcode); |
3676 | #else |
3677 | /* On NOMMU, we must never block! |
3678 | * Example: { sleep 99 | read line; } & echo Ok |
3679 | */ |
3680 | re_execute_shell(to_free, |
3681 | argv[0], |
3682 | G.global_argv[0], |
3683 | G.global_argv + 1, |
3684 | argv); |
3685 | #endif |
3686 | } |
3687 | |
3688 | |
3689 | static void execvp_or_die(char **argv) NORETURN; |
3690 | static void execvp_or_die(char **argv) |
3691 | { |
3692 | debug_printf_exec("execing '%s'\n", argv[0]); |
3693 | sigprocmask(SIG_SETMASK, &G.inherited_set, NULL); |
3694 | execvp(argv[0], argv); |
3695 | bb_perror_msg("can't execute '%s'", argv[0]); |
3696 | _exit(127); /* bash compat */ |
3697 | } |
3698 | |
3699 | #if BB_MMU |
3700 | #define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \ |
3701 | pseudo_exec_argv(argv, assignment_cnt, argv_expanded) |
3702 | #define pseudo_exec(nommu_save, command, argv_expanded) \ |
3703 | pseudo_exec(command, argv_expanded) |
3704 | #endif |
3705 | |
3706 | /* Called after [v]fork() in run_pipe, or from builtin_exec. |
3707 | * Never returns. |
3708 | * Don't exit() here. If you don't exec, use _exit instead. |
3709 | * The at_exit handlers apparently confuse the calling process, |
3710 | * in particular stdin handling. Not sure why? -- because of vfork! (vda) */ |
3711 | static void pseudo_exec_argv(nommu_save_t *nommu_save, |
3712 | char **argv, int assignment_cnt, |
3713 | char **argv_expanded) NORETURN; |
3714 | static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save, |
3715 | char **argv, int assignment_cnt, |
3716 | char **argv_expanded) |
3717 | { |
3718 | char **new_env; |
3719 | |
3720 | /* Case when we are here: ... | var=val | ... */ |
3721 | if (!argv[assignment_cnt]) |
3722 | _exit(EXIT_SUCCESS); |
3723 | |
3724 | new_env = expand_assignments(argv, assignment_cnt); |
3725 | #if BB_MMU |
3726 | set_vars_and_save_old(new_env); |
3727 | free(new_env); /* optional */ |
3728 | /* we can also destroy set_vars_and_save_old's return value, |
3729 | * to save memory */ |
3730 | #else |
3731 | nommu_save->new_env = new_env; |
3732 | nommu_save->old_vars = set_vars_and_save_old(new_env); |
3733 | #endif |
3734 | if (argv_expanded) { |
3735 | argv = argv_expanded; |
3736 | } else { |
3737 | argv = expand_strvec_to_strvec(argv + assignment_cnt); |
3738 | #if !BB_MMU |
3739 | nommu_save->argv = argv; |
3740 | #endif |
3741 | } |
3742 | |
3743 | #if ENABLE_FEATURE_SH_STANDALONE || BB_MMU |
3744 | if (strchr(argv[0], '/') != NULL) |
3745 | goto skip; |
3746 | #endif |
3747 | |
3748 | /* Check if the command matches any of the builtins. |
3749 | * Depending on context, this might be redundant. But it's |
3750 | * easier to waste a few CPU cycles than it is to figure out |
3751 | * if this is one of those cases. |
3752 | */ |
3753 | { |
3754 | /* On NOMMU, it is more expensive to re-execute shell |
3755 | * just in order to run echo or test builtin. |
3756 | * It's better to skip it here and run corresponding |
3757 | * non-builtin later. */ |
3758 | const struct built_in_command *x; |
3759 | x = BB_MMU ? find_builtin(argv[0]) : find_builtin1(argv[0]); |
3760 | if (x) { |
3761 | exec_builtin(&nommu_save->argv_from_re_execing, x, argv); |
3762 | } |
3763 | } |
3764 | #if ENABLE_HUSH_FUNCTIONS |
3765 | /* Check if the command matches any functions */ |
3766 | { |
3767 | const struct function *funcp = find_function(argv[0]); |
3768 | if (funcp) { |
3769 | exec_function(&nommu_save->argv_from_re_execing, funcp, argv); |
3770 | } |
3771 | } |
3772 | #endif |
3773 | |
3774 | #if ENABLE_FEATURE_SH_STANDALONE |
3775 | /* Check if the command matches any busybox applets */ |
3776 | { |
3777 | int a = find_applet_by_name(argv[0]); |
3778 | if (a >= 0) { |
3779 | # if BB_MMU /* see above why on NOMMU it is not allowed */ |
3780 | if (APPLET_IS_NOEXEC(a)) { |
3781 | debug_printf_exec("running applet '%s'\n", argv[0]); |
3782 | run_applet_no_and_exit(a, argv); |
3783 | } |
3784 | # endif |
3785 | /* Re-exec ourselves */ |
3786 | debug_printf_exec("re-execing applet '%s'\n", argv[0]); |
3787 | sigprocmask(SIG_SETMASK, &G.inherited_set, NULL); |
3788 | execv(bb_busybox_exec_path, argv); |
3789 | /* If they called chroot or otherwise made the binary no longer |
3790 | * executable, fall through */ |
3791 | } |
3792 | } |
3793 | #endif |
3794 | |
3795 | #if ENABLE_FEATURE_SH_STANDALONE || BB_MMU |
3796 | skip: |
3797 | #endif |
3798 | execvp_or_die(argv); |
3799 | } |
3800 | |
3801 | /* Called after [v]fork() in run_pipe |
3802 | */ |
3803 | static void pseudo_exec(nommu_save_t *nommu_save, |
3804 | struct command *command, |
3805 | char **argv_expanded) NORETURN; |
3806 | static void pseudo_exec(nommu_save_t *nommu_save, |
3807 | struct command *command, |
3808 | char **argv_expanded) |
3809 | { |
3810 | if (command->argv) { |
3811 | pseudo_exec_argv(nommu_save, command->argv, |
3812 | command->assignment_cnt, argv_expanded); |
3813 | } |
3814 | |
3815 | if (command->group) { |
3816 | /* Cases when we are here: |
3817 | * ( list ) |
3818 | * { list } & |
3819 | * ... | ( list ) | ... |
3820 | * ... | { list } | ... |
3821 | */ |
3822 | #if BB_MMU |
3823 | int rcode; |
3824 | debug_printf_exec("pseudo_exec: run_list\n"); |
3825 | reset_traps_to_defaults(); |
3826 | rcode = run_list(command->group); |
3827 | /* OK to leak memory by not calling free_pipe_list, |
3828 | * since this process is about to exit */ |
3829 | _exit(rcode); |
3830 | #else |
3831 | re_execute_shell(&nommu_save->argv_from_re_execing, |
3832 | command->group_as_string, |
3833 | G.global_argv[0], |
3834 | G.global_argv + 1, |
3835 | NULL); |
3836 | #endif |
3837 | } |
3838 | |
3839 | /* Case when we are here: ... | >file */ |
3840 | debug_printf_exec("pseudo_exec'ed null command\n"); |
3841 | _exit(EXIT_SUCCESS); |
3842 | } |
3843 | |
3844 | #if ENABLE_HUSH_JOB |
3845 | static const char *get_cmdtext(struct pipe *pi) |
3846 | { |
3847 | char **argv; |
3848 | char *p; |
3849 | int len; |
3850 | |
3851 | /* This is subtle. ->cmdtext is created only on first backgrounding. |
3852 | * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...) |
3853 | * On subsequent bg argv is trashed, but we won't use it */ |
3854 | if (pi->cmdtext) |
3855 | return pi->cmdtext; |
3856 | argv = pi->cmds[0].argv; |
3857 | if (!argv || !argv[0]) { |
3858 | pi->cmdtext = xzalloc(1); |
3859 | return pi->cmdtext; |
3860 | } |
3861 | |
3862 | len = 0; |
3863 | do { |
3864 | len += strlen(*argv) + 1; |
3865 | } while (*++argv); |
3866 | p = xmalloc(len); |
3867 | pi->cmdtext = p; |
3868 | argv = pi->cmds[0].argv; |
3869 | do { |
3870 | len = strlen(*argv); |
3871 | memcpy(p, *argv, len); |
3872 | p += len; |
3873 | *p++ = ' '; |
3874 | } while (*++argv); |
3875 | p[-1] = '\0'; |
3876 | return pi->cmdtext; |
3877 | } |
3878 | |
3879 | static void insert_bg_job(struct pipe *pi) |
3880 | { |
3881 | struct pipe *job, **jobp; |
3882 | int i; |
3883 | |
3884 | /* Linear search for the ID of the job to use */ |
3885 | pi->jobid = 1; |
3886 | for (job = G.job_list; job; job = job->next) |
3887 | if (job->jobid >= pi->jobid) |
3888 | pi->jobid = job->jobid + 1; |
3889 | |
3890 | /* Add job to the list of running jobs */ |
3891 | jobp = &G.job_list; |
3892 | while ((job = *jobp) != NULL) |
3893 | jobp = &job->next; |
3894 | job = *jobp = xmalloc(sizeof(*job)); |
3895 | |
3896 | *job = *pi; /* physical copy */ |
3897 | job->next = NULL; |
3898 | job->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds); |
3899 | /* Cannot copy entire pi->cmds[] vector! This causes double frees */ |
3900 | for (i = 0; i < pi->num_cmds; i++) { |
3901 | job->cmds[i].pid = pi->cmds[i].pid; |
3902 | /* all other fields are not used and stay zero */ |
3903 | } |
3904 | job->cmdtext = xstrdup(get_cmdtext(pi)); |
3905 | |
3906 | if (G_interactive_fd) |
3907 | printf("[%d] %d %s\n", job->jobid, job->cmds[0].pid, job->cmdtext); |
3908 | G.last_jobid = job->jobid; |
3909 | } |
3910 | |
3911 | static void remove_bg_job(struct pipe *pi) |
3912 | { |
3913 | struct pipe *prev_pipe; |
3914 | |
3915 | if (pi == G.job_list) { |
3916 | G.job_list = pi->next; |
3917 | } else { |
3918 | prev_pipe = G.job_list; |
3919 | while (prev_pipe->next != pi) |
3920 | prev_pipe = prev_pipe->next; |
3921 | prev_pipe->next = pi->next; |
3922 | } |
3923 | if (G.job_list) |
3924 | G.last_jobid = G.job_list->jobid; |
3925 | else |
3926 | G.last_jobid = 0; |
3927 | } |
3928 | |
3929 | /* Remove a backgrounded job */ |
3930 | static void delete_finished_bg_job(struct pipe *pi) |
3931 | { |
3932 | remove_bg_job(pi); |
3933 | pi->stopped_cmds = 0; |
3934 | free_pipe(pi); |
3935 | free(pi); |
3936 | } |
3937 | #endif /* JOB */ |
3938 | |
3939 | /* Check to see if any processes have exited -- if they |
3940 | * have, figure out why and see if a job has completed */ |
3941 | static int checkjobs(struct pipe* fg_pipe) |
3942 | { |
3943 | int attributes; |
3944 | int status; |
3945 | #if ENABLE_HUSH_JOB |
3946 | struct pipe *pi; |
3947 | #endif |
3948 | pid_t childpid; |
3949 | int rcode = 0; |
3950 | |
3951 | debug_printf_jobs("checkjobs %p\n", fg_pipe); |
3952 | |
3953 | attributes = WUNTRACED; |
3954 | if (fg_pipe == NULL) |
3955 | attributes |= WNOHANG; |
3956 | |
3957 | errno = 0; |
3958 | #if ENABLE_HUSH_FAST |
3959 | if (G.handled_SIGCHLD == G.count_SIGCHLD) { |
3960 | //bb_error_msg("[%d] checkjobs: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d children?:%d fg_pipe:%p", |
3961 | //getpid(), G.count_SIGCHLD, G.handled_SIGCHLD, G.we_have_children, fg_pipe); |
3962 | /* There was neither fork nor SIGCHLD since last waitpid */ |
3963 | /* Avoid doing waitpid syscall if possible */ |
3964 | if (!G.we_have_children) { |
3965 | errno = ECHILD; |
3966 | return -1; |
3967 | } |
3968 | if (fg_pipe == NULL) { /* is WNOHANG set? */ |
3969 | /* We have children, but they did not exit |
3970 | * or stop yet (we saw no SIGCHLD) */ |
3971 | return 0; |
3972 | } |
3973 | /* else: !WNOHANG, waitpid will block, can't short-circuit */ |
3974 | } |
3975 | #endif |
3976 | |
3977 | /* Do we do this right? |
3978 | * bash-3.00# sleep 20 | false |
3979 | * <ctrl-Z pressed> |
3980 | * [3]+ Stopped sleep 20 | false |
3981 | * bash-3.00# echo $? |
3982 | * 1 <========== bg pipe is not fully done, but exitcode is already known! |
3983 | * [hush 1.14.0: yes we do it right] |
3984 | */ |
3985 | wait_more: |
3986 | while (1) { |
3987 | int i; |
3988 | int dead; |
3989 | |
3990 | #if ENABLE_HUSH_FAST |
3991 | i = G.count_SIGCHLD; |
3992 | #endif |
3993 | childpid = waitpid(-1, &status, attributes); |
3994 | if (childpid <= 0) { |
3995 | if (childpid && errno != ECHILD) |
3996 | bb_perror_msg("waitpid"); |
3997 | #if ENABLE_HUSH_FAST |
3998 | else { /* Until next SIGCHLD, waitpid's are useless */ |
3999 | G.we_have_children = (childpid == 0); |
4000 | G.handled_SIGCHLD = i; |
4001 | //bb_error_msg("[%d] checkjobs: waitpid returned <= 0, G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
4002 | } |
4003 | #endif |
4004 | break; |
4005 | } |
4006 | dead = WIFEXITED(status) || WIFSIGNALED(status); |
4007 | |
4008 | #if DEBUG_JOBS |
4009 | if (WIFSTOPPED(status)) |
4010 | debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n", |
4011 | childpid, WSTOPSIG(status), WEXITSTATUS(status)); |
4012 | if (WIFSIGNALED(status)) |
4013 | debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n", |
4014 | childpid, WTERMSIG(status), WEXITSTATUS(status)); |
4015 | if (WIFEXITED(status)) |
4016 | debug_printf_jobs("pid %d exited, exitcode %d\n", |
4017 | childpid, WEXITSTATUS(status)); |
4018 | #endif |
4019 | /* Were we asked to wait for fg pipe? */ |
4020 | if (fg_pipe) { |
4021 | for (i = 0; i < fg_pipe->num_cmds; i++) { |
4022 | debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid); |
4023 | if (fg_pipe->cmds[i].pid != childpid) |
4024 | continue; |
4025 | if (dead) { |
4026 | fg_pipe->cmds[i].pid = 0; |
4027 | fg_pipe->alive_cmds--; |
4028 | if (i == fg_pipe->num_cmds - 1) { |
4029 | /* last process gives overall exitstatus */ |
4030 | rcode = WEXITSTATUS(status); |
4031 | /* bash prints killer signal's name for *last* |
4032 | * process in pipe (prints just newline for SIGINT). |
4033 | * Mimic this. Example: "sleep 5" + (^\ or kill -QUIT) |
4034 | */ |
4035 | if (WIFSIGNALED(status)) { |
4036 | int sig = WTERMSIG(status); |
4037 | printf("%s\n", sig == SIGINT ? "" : get_signame(sig)); |
4038 | /* TODO: MIPS has 128 sigs (1..128), what if sig==128 here? |
4039 | * Maybe we need to use sig | 128? */ |
4040 | rcode = sig + 128; |
4041 | } |
4042 | IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;) |
4043 | } |
4044 | } else { |
4045 | fg_pipe->cmds[i].is_stopped = 1; |
4046 | fg_pipe->stopped_cmds++; |
4047 | } |
4048 | debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n", |
4049 | fg_pipe->alive_cmds, fg_pipe->stopped_cmds); |
4050 | if (fg_pipe->alive_cmds - fg_pipe->stopped_cmds <= 0) { |
4051 | /* All processes in fg pipe have exited or stopped */ |
4052 | /* Note: *non-interactive* bash does not continue if all processes in fg pipe |
4053 | * are stopped. Testcase: "cat | cat" in a script (not on command line!) |
4054 | * and "killall -STOP cat" */ |
4055 | if (G_interactive_fd) { |
4056 | #if ENABLE_HUSH_JOB |
4057 | if (fg_pipe->alive_cmds) |
4058 | insert_bg_job(fg_pipe); |
4059 | #endif |
4060 | return rcode; |
4061 | } |
4062 | if (!fg_pipe->alive_cmds) |
4063 | return rcode; |
4064 | } |
4065 | /* There are still running processes in the fg pipe */ |
4066 | goto wait_more; /* do waitpid again */ |
4067 | } |
4068 | /* it wasnt fg_pipe, look for process in bg pipes */ |
4069 | } |
4070 | |
4071 | #if ENABLE_HUSH_JOB |
4072 | /* We asked to wait for bg or orphaned children */ |
4073 | /* No need to remember exitcode in this case */ |
4074 | for (pi = G.job_list; pi; pi = pi->next) { |
4075 | for (i = 0; i < pi->num_cmds; i++) { |
4076 | if (pi->cmds[i].pid == childpid) |
4077 | goto found_pi_and_prognum; |
4078 | } |
4079 | } |
4080 | /* Happens when shell is used as init process (init=/bin/sh) */ |
4081 | debug_printf("checkjobs: pid %d was not in our list!\n", childpid); |
4082 | continue; /* do waitpid again */ |
4083 | |
4084 | found_pi_and_prognum: |
4085 | if (dead) { |
4086 | /* child exited */ |
4087 | pi->cmds[i].pid = 0; |
4088 | pi->alive_cmds--; |
4089 | if (!pi->alive_cmds) { |
4090 | if (G_interactive_fd) |
4091 | printf(JOB_STATUS_FORMAT, pi->jobid, |
4092 | "Done", pi->cmdtext); |
4093 | delete_finished_bg_job(pi); |
4094 | } |
4095 | } else { |
4096 | /* child stopped */ |
4097 | pi->cmds[i].is_stopped = 1; |
4098 | pi->stopped_cmds++; |
4099 | } |
4100 | #endif |
4101 | } /* while (waitpid succeeds)... */ |
4102 | |
4103 | return rcode; |
4104 | } |
4105 | |
4106 | #if ENABLE_HUSH_JOB |
4107 | static int checkjobs_and_fg_shell(struct pipe* fg_pipe) |
4108 | { |
4109 | pid_t p; |
4110 | int rcode = checkjobs(fg_pipe); |
4111 | if (G_saved_tty_pgrp) { |
4112 | /* Job finished, move the shell to the foreground */ |
4113 | p = getpgrp(); /* our process group id */ |
4114 | debug_printf_jobs("fg'ing ourself: getpgrp()=%d\n", (int)p); |
4115 | tcsetpgrp(G_interactive_fd, p); |
4116 | } |
4117 | return rcode; |
4118 | } |
4119 | #endif |
4120 | |
4121 | /* Start all the jobs, but don't wait for anything to finish. |
4122 | * See checkjobs(). |
4123 | * |
4124 | * Return code is normally -1, when the caller has to wait for children |
4125 | * to finish to determine the exit status of the pipe. If the pipe |
4126 | * is a simple builtin command, however, the action is done by the |
4127 | * time run_pipe returns, and the exit code is provided as the |
4128 | * return value. |
4129 | * |
4130 | * Returns -1 only if started some children. IOW: we have to |
4131 | * mask out retvals of builtins etc with 0xff! |
4132 | * |
4133 | * The only case when we do not need to [v]fork is when the pipe |
4134 | * is single, non-backgrounded, non-subshell command. Examples: |
4135 | * cmd ; ... { list } ; ... |
4136 | * cmd && ... { list } && ... |
4137 | * cmd || ... { list } || ... |
4138 | * If it is, then we can run cmd as a builtin, NOFORK [do we do this?], |
4139 | * or (if SH_STANDALONE) an applet, and we can run the { list } |
4140 | * with run_list. If it isn't one of these, we fork and exec cmd. |
4141 | * |
4142 | * Cases when we must fork: |
4143 | * non-single: cmd | cmd |
4144 | * backgrounded: cmd & { list } & |
4145 | * subshell: ( list ) [&] |
4146 | */ |
4147 | static NOINLINE int run_pipe(struct pipe *pi) |
4148 | { |
4149 | static const char *const null_ptr = NULL; |
4150 | int i; |
4151 | int nextin; |
4152 | struct command *command; |
4153 | char **argv_expanded; |
4154 | char **argv; |
4155 | char *p; |
4156 | /* it is not always needed, but we aim to smaller code */ |
4157 | int squirrel[] = { -1, -1, -1 }; |
4158 | int rcode; |
4159 | |
4160 | debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds); |
4161 | debug_enter(); |
4162 | |
4163 | IF_HUSH_JOB(pi->pgrp = -1;) |
4164 | pi->stopped_cmds = 0; |
4165 | command = &(pi->cmds[0]); |
4166 | argv_expanded = NULL; |
4167 | |
4168 | if (pi->num_cmds != 1 |
4169 | || pi->followup == PIPE_BG |
4170 | || command->cmd_type == CMD_SUBSHELL |
4171 | ) { |
4172 | goto must_fork; |
4173 | } |
4174 | |
4175 | pi->alive_cmds = 1; |
4176 | |
4177 | debug_printf_exec(": group:%p argv:'%s'\n", |
4178 | command->group, command->argv ? command->argv[0] : "NONE"); |
4179 | |
4180 | if (command->group) { |
4181 | #if ENABLE_HUSH_FUNCTIONS |
4182 | if (command->cmd_type == CMD_FUNCDEF) { |
4183 | /* "executing" func () { list } */ |
4184 | struct function *funcp; |
4185 | |
4186 | funcp = new_function(command->argv[0]); |
4187 | /* funcp->name is already set to argv[0] */ |
4188 | funcp->body = command->group; |
4189 | # if !BB_MMU |
4190 | funcp->body_as_string = command->group_as_string; |
4191 | command->group_as_string = NULL; |
4192 | # endif |
4193 | command->group = NULL; |
4194 | command->argv[0] = NULL; |
4195 | debug_printf_exec("cmd %p has child func at %p\n", command, funcp); |
4196 | funcp->parent_cmd = command; |
4197 | command->child_func = funcp; |
4198 | |
4199 | debug_printf_exec("run_pipe: return EXIT_SUCCESS\n"); |
4200 | debug_leave(); |
4201 | return EXIT_SUCCESS; |
4202 | } |
4203 | #endif |
4204 | /* { list } */ |
4205 | debug_printf("non-subshell group\n"); |
4206 | rcode = 1; /* exitcode if redir failed */ |
4207 | if (setup_redirects(command, squirrel) == 0) { |
4208 | debug_printf_exec(": run_list\n"); |
4209 | rcode = run_list(command->group) & 0xff; |
4210 | } |
4211 | restore_redirects(squirrel); |
4212 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) |
4213 | debug_leave(); |
4214 | debug_printf_exec("run_pipe: return %d\n", rcode); |
4215 | return rcode; |
4216 | } |
4217 | |
4218 | argv = command->argv ? command->argv : (char **) &null_ptr; |
4219 | { |
4220 | const struct built_in_command *x; |
4221 | #if ENABLE_HUSH_FUNCTIONS |
4222 | const struct function *funcp; |
4223 | #else |
4224 | enum { funcp = 0 }; |
4225 | #endif |
4226 | char **new_env = NULL; |
4227 | struct variable *old_vars = NULL; |
4228 | |
4229 | if (argv[command->assignment_cnt] == NULL) { |
4230 | /* Assignments, but no command */ |
4231 | /* Ensure redirects take effect (that is, create files). |
4232 | * Try "a=t >file": */ |
4233 | rcode = setup_redirects(command, squirrel); |
4234 | restore_redirects(squirrel); |
4235 | /* Set shell variables */ |
4236 | while (*argv) { |
4237 | p = expand_string_to_string(*argv); |
4238 | debug_printf_exec("set shell var:'%s'->'%s'\n", |
4239 | *argv, p); |
4240 | set_local_var(p, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0); |
4241 | argv++; |
4242 | } |
4243 | /* Redirect error sets $? to 1. Othervise, |
4244 | * if evaluating assignment value set $?, retain it. |
4245 | * Try "false; q=`exit 2`; echo $?" - should print 2: */ |
4246 | if (rcode == 0) |
4247 | rcode = G.last_exitcode; |
4248 | /* Do we need to flag set_local_var() errors? |
4249 | * "assignment to readonly var" and "putenv error" |
4250 | */ |
4251 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) |
4252 | debug_leave(); |
4253 | debug_printf_exec("run_pipe: return %d\n", rcode); |
4254 | return rcode; |
4255 | } |
4256 | |
4257 | /* Expand the rest into (possibly) many strings each */ |
4258 | if (0) {} |
4259 | #if ENABLE_HUSH_BASH_COMPAT |
4260 | else if (command->cmd_type == CMD_SINGLEWORD_NOGLOB) { |
4261 | argv_expanded = expand_strvec_to_strvec_singleword_noglob(argv + command->assignment_cnt); |
4262 | } |
4263 | #endif |
4264 | #ifdef CMD_SINGLEWORD_NOGLOB_COND |
4265 | else if (command->cmd_type == CMD_SINGLEWORD_NOGLOB_COND) { |
4266 | argv_expanded = expand_strvec_to_strvec_singleword_noglob_cond(argv + command->assignment_cnt); |
4267 | |
4268 | } |
4269 | #endif |
4270 | else { |
4271 | argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt); |
4272 | } |
4273 | |
4274 | /* if someone gives us an empty string: `cmd with empty output` */ |
4275 | if (!argv_expanded[0]) { |
4276 | free(argv_expanded); |
4277 | debug_leave(); |
4278 | return G.last_exitcode; |
4279 | } |
4280 | |
4281 | x = find_builtin(argv_expanded[0]); |
4282 | #if ENABLE_HUSH_FUNCTIONS |
4283 | funcp = NULL; |
4284 | if (!x) |
4285 | funcp = find_function(argv_expanded[0]); |
4286 | #endif |
4287 | if (x || funcp) { |
4288 | if (!funcp) { |
4289 | if (x->b_function == builtin_exec && argv_expanded[1] == NULL) { |
4290 | debug_printf("exec with redirects only\n"); |
4291 | rcode = setup_redirects(command, NULL); |
4292 | goto clean_up_and_ret1; |
4293 | } |
4294 | } |
4295 | /* setup_redirects acts on file descriptors, not FILEs. |
4296 | * This is perfect for work that comes after exec(). |
4297 | * Is it really safe for inline use? Experimentally, |
4298 | * things seem to work. */ |
4299 | rcode = setup_redirects(command, squirrel); |
4300 | if (rcode == 0) { |
4301 | new_env = expand_assignments(argv, command->assignment_cnt); |
4302 | old_vars = set_vars_and_save_old(new_env); |
4303 | if (!funcp) { |
4304 | debug_printf_exec(": builtin '%s' '%s'...\n", |
4305 | x->b_cmd, argv_expanded[1]); |
4306 | rcode = x->b_function(argv_expanded) & 0xff; |
4307 | fflush_all(); |
4308 | } |
4309 | #if ENABLE_HUSH_FUNCTIONS |
4310 | else { |
4311 | # if ENABLE_HUSH_LOCAL |
4312 | struct variable **sv; |
4313 | sv = G.shadowed_vars_pp; |
4314 | G.shadowed_vars_pp = &old_vars; |
4315 | # endif |
4316 | debug_printf_exec(": function '%s' '%s'...\n", |
4317 | funcp->name, argv_expanded[1]); |
4318 | rcode = run_function(funcp, argv_expanded) & 0xff; |
4319 | # if ENABLE_HUSH_LOCAL |
4320 | G.shadowed_vars_pp = sv; |
4321 | # endif |
4322 | } |
4323 | #endif |
4324 | } |
4325 | #if ENABLE_FEATURE_SH_STANDALONE |
4326 | clean_up_and_ret: |
4327 | #endif |
4328 | restore_redirects(squirrel); |
4329 | unset_vars(new_env); |
4330 | add_vars(old_vars); |
4331 | clean_up_and_ret1: |
4332 | free(argv_expanded); |
4333 | IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;) |
4334 | debug_leave(); |
4335 | debug_printf_exec("run_pipe return %d\n", rcode); |
4336 | return rcode; |
4337 | } |
4338 | |
4339 | #if ENABLE_FEATURE_SH_STANDALONE |
4340 | i = find_applet_by_name(argv_expanded[0]); |
4341 | if (i >= 0 && APPLET_IS_NOFORK(i)) { |
4342 | rcode = setup_redirects(command, squirrel); |
4343 | if (rcode == 0) { |
4344 | new_env = expand_assignments(argv, command->assignment_cnt); |
4345 | old_vars = set_vars_and_save_old(new_env); |
4346 | debug_printf_exec(": run_nofork_applet '%s' '%s'...\n", |
4347 | argv_expanded[0], argv_expanded[1]); |
4348 | rcode = run_nofork_applet(i, argv_expanded); |
4349 | } |
4350 | goto clean_up_and_ret; |
4351 | } |
4352 | #endif |
4353 | /* It is neither builtin nor applet. We must fork. */ |
4354 | } |
4355 | |
4356 | must_fork: |
4357 | /* NB: argv_expanded may already be created, and that |
4358 | * might include `cmd` runs! Do not rerun it! We *must* |
4359 | * use argv_expanded if it's non-NULL */ |
4360 | |
4361 | /* Going to fork a child per each pipe member */ |
4362 | pi->alive_cmds = 0; |
4363 | nextin = 0; |
4364 | |
4365 | for (i = 0; i < pi->num_cmds; i++) { |
4366 | struct fd_pair pipefds; |
4367 | #if !BB_MMU |
4368 | volatile nommu_save_t nommu_save; |
4369 | nommu_save.new_env = NULL; |
4370 | nommu_save.old_vars = NULL; |
4371 | nommu_save.argv = NULL; |
4372 | nommu_save.argv_from_re_execing = NULL; |
4373 | #endif |
4374 | command = &(pi->cmds[i]); |
4375 | if (command->argv) { |
4376 | debug_printf_exec(": pipe member '%s' '%s'...\n", |
4377 | command->argv[0], command->argv[1]); |
4378 | } else { |
4379 | debug_printf_exec(": pipe member with no argv\n"); |
4380 | } |
4381 | |
4382 | /* pipes are inserted between pairs of commands */ |
4383 | pipefds.rd = 0; |
4384 | pipefds.wr = 1; |
4385 | if ((i + 1) < pi->num_cmds) |
4386 | xpiped_pair(pipefds); |
4387 | |
4388 | command->pid = BB_MMU ? fork() : vfork(); |
4389 | if (!command->pid) { /* child */ |
4390 | #if ENABLE_HUSH_JOB |
4391 | disable_restore_tty_pgrp_on_exit(); |
4392 | CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */ |
4393 | |
4394 | /* Every child adds itself to new process group |
4395 | * with pgid == pid_of_first_child_in_pipe */ |
4396 | if (G.run_list_level == 1 && G_interactive_fd) { |
4397 | pid_t pgrp; |
4398 | pgrp = pi->pgrp; |
4399 | if (pgrp < 0) /* true for 1st process only */ |
4400 | pgrp = getpid(); |
4401 | if (setpgid(0, pgrp) == 0 |
4402 | && pi->followup != PIPE_BG |
4403 | && G_saved_tty_pgrp /* we have ctty */ |
4404 | ) { |
4405 | /* We do it in *every* child, not just first, |
4406 | * to avoid races */ |
4407 | tcsetpgrp(G_interactive_fd, pgrp); |
4408 | } |
4409 | } |
4410 | #endif |
4411 | if (pi->alive_cmds == 0 && pi->followup == PIPE_BG) { |
4412 | /* 1st cmd in backgrounded pipe |
4413 | * should have its stdin /dev/null'ed */ |
4414 | close(0); |
4415 | if (open(bb_dev_null, O_RDONLY)) |
4416 | xopen("/", O_RDONLY); |
4417 | } else { |
4418 | xmove_fd(nextin, 0); |
4419 | } |
4420 | xmove_fd(pipefds.wr, 1); |
4421 | if (pipefds.rd > 1) |
4422 | close(pipefds.rd); |
4423 | /* Like bash, explicit redirects override pipes, |
4424 | * and the pipe fd is available for dup'ing. */ |
4425 | if (setup_redirects(command, NULL)) |
4426 | _exit(1); |
4427 | |
4428 | /* Restore default handlers just prior to exec */ |
4429 | /*signal(SIGCHLD, SIG_DFL); - so far we don't have any handlers */ |
4430 | |
4431 | /* Stores to nommu_save list of env vars putenv'ed |
4432 | * (NOMMU, on MMU we don't need that) */ |
4433 | /* cast away volatility... */ |
4434 | pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded); |
4435 | /* pseudo_exec() does not return */ |
4436 | } |
4437 | |
4438 | /* parent or error */ |
4439 | #if ENABLE_HUSH_FAST |
4440 | G.count_SIGCHLD++; |
4441 | //bb_error_msg("[%d] fork in run_pipe: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
4442 | #endif |
4443 | enable_restore_tty_pgrp_on_exit(); |
4444 | #if !BB_MMU |
4445 | /* Clean up after vforked child */ |
4446 | free(nommu_save.argv); |
4447 | free(nommu_save.argv_from_re_execing); |
4448 | unset_vars(nommu_save.new_env); |
4449 | add_vars(nommu_save.old_vars); |
4450 | #endif |
4451 | free(argv_expanded); |
4452 | argv_expanded = NULL; |
4453 | if (command->pid < 0) { /* [v]fork failed */ |
4454 | /* Clearly indicate, was it fork or vfork */ |
4455 | bb_perror_msg(BB_MMU ? "vfork"+1 : "vfork"); |
4456 | } else { |
4457 | pi->alive_cmds++; |
4458 | #if ENABLE_HUSH_JOB |
4459 | /* Second and next children need to know pid of first one */ |
4460 | if (pi->pgrp < 0) |
4461 | pi->pgrp = command->pid; |
4462 | #endif |
4463 | } |
4464 | |
4465 | if (i) |
4466 | close(nextin); |
4467 | if ((i + 1) < pi->num_cmds) |
4468 | close(pipefds.wr); |
4469 | /* Pass read (output) pipe end to next iteration */ |
4470 | nextin = pipefds.rd; |
4471 | } |
4472 | |
4473 | if (!pi->alive_cmds) { |
4474 | debug_leave(); |
4475 | debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n"); |
4476 | return 1; |
4477 | } |
4478 | |
4479 | debug_leave(); |
4480 | debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds); |
4481 | return -1; |
4482 | } |
4483 | |
4484 | #ifndef debug_print_tree |
4485 | static void debug_print_tree(struct pipe *pi, int lvl) |
4486 | { |
4487 | static const char *const PIPE[] = { |
4488 | [PIPE_SEQ] = "SEQ", |
4489 | [PIPE_AND] = "AND", |
4490 | [PIPE_OR ] = "OR" , |
4491 | [PIPE_BG ] = "BG" , |
4492 | }; |
4493 | static const char *RES[] = { |
4494 | [RES_NONE ] = "NONE" , |
4495 | # if ENABLE_HUSH_IF |
4496 | [RES_IF ] = "IF" , |
4497 | [RES_THEN ] = "THEN" , |
4498 | [RES_ELIF ] = "ELIF" , |
4499 | [RES_ELSE ] = "ELSE" , |
4500 | [RES_FI ] = "FI" , |
4501 | # endif |
4502 | # if ENABLE_HUSH_LOOPS |
4503 | [RES_FOR ] = "FOR" , |
4504 | [RES_WHILE] = "WHILE", |
4505 | [RES_UNTIL] = "UNTIL", |
4506 | [RES_DO ] = "DO" , |
4507 | [RES_DONE ] = "DONE" , |
4508 | # endif |
4509 | # if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE |
4510 | [RES_IN ] = "IN" , |
4511 | # endif |
4512 | # if ENABLE_HUSH_CASE |
4513 | [RES_CASE ] = "CASE" , |
4514 | [RES_CASE_IN ] = "CASE_IN" , |
4515 | [RES_MATCH] = "MATCH", |
4516 | [RES_CASE_BODY] = "CASE_BODY", |
4517 | [RES_ESAC ] = "ESAC" , |
4518 | # endif |
4519 | [RES_XXXX ] = "XXXX" , |
4520 | [RES_SNTX ] = "SNTX" , |
4521 | }; |
4522 | static const char *const CMDTYPE[] = { |
4523 | "{}", |
4524 | "()", |
4525 | "[noglob]", |
4526 | # if ENABLE_HUSH_FUNCTIONS |
4527 | "func()", |
4528 | # endif |
4529 | }; |
4530 | |
4531 | int pin, prn; |
4532 | |
4533 | pin = 0; |
4534 | while (pi) { |
4535 | fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "", |
4536 | pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]); |
4537 | prn = 0; |
4538 | while (prn < pi->num_cmds) { |
4539 | struct command *command = &pi->cmds[prn]; |
4540 | char **argv = command->argv; |
4541 | |
4542 | fprintf(stderr, "%*s cmd %d assignment_cnt:%d", |
4543 | lvl*2, "", prn, |
4544 | command->assignment_cnt); |
4545 | if (command->group) { |
4546 | fprintf(stderr, " group %s: (argv=%p)%s%s\n", |
4547 | CMDTYPE[command->cmd_type], |
4548 | argv |
4549 | # if !BB_MMU |
4550 | , " group_as_string:", command->group_as_string |
4551 | # else |
4552 | , "", "" |
4553 | # endif |
4554 | ); |
4555 | debug_print_tree(command->group, lvl+1); |
4556 | prn++; |
4557 | continue; |
4558 | } |
4559 | if (argv) while (*argv) { |
4560 | fprintf(stderr, " '%s'", *argv); |
4561 | argv++; |
4562 | } |
4563 | fprintf(stderr, "\n"); |
4564 | prn++; |
4565 | } |
4566 | pi = pi->next; |
4567 | pin++; |
4568 | } |
4569 | } |
4570 | #endif /* debug_print_tree */ |
4571 | |
4572 | /* NB: called by pseudo_exec, and therefore must not modify any |
4573 | * global data until exec/_exit (we can be a child after vfork!) */ |
4574 | static int run_list(struct pipe *pi) |
4575 | { |
4576 | #if ENABLE_HUSH_CASE |
4577 | char *case_word = NULL; |
4578 | #endif |
4579 | #if ENABLE_HUSH_LOOPS |
4580 | struct pipe *loop_top = NULL; |
4581 | char **for_lcur = NULL; |
4582 | char **for_list = NULL; |
4583 | #endif |
4584 | smallint last_followup; |
4585 | smalluint rcode; |
4586 | #if ENABLE_HUSH_IF || ENABLE_HUSH_CASE |
4587 | smalluint cond_code = 0; |
4588 | #else |
4589 | enum { cond_code = 0 }; |
4590 | #endif |
4591 | #if HAS_KEYWORDS |
4592 | smallint rword; /* enum reserved_style */ |
4593 | smallint last_rword; /* ditto */ |
4594 | #endif |
4595 | |
4596 | debug_printf_exec("run_list start lvl %d\n", G.run_list_level); |
4597 | debug_enter(); |
4598 | |
4599 | #if ENABLE_HUSH_LOOPS |
4600 | /* Check syntax for "for" */ |
4601 | for (struct pipe *cpipe = pi; cpipe; cpipe = cpipe->next) { |
4602 | if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN) |
4603 | continue; |
4604 | /* current word is FOR or IN (BOLD in comments below) */ |
4605 | if (cpipe->next == NULL) { |
4606 | syntax_error("malformed for"); |
4607 | debug_leave(); |
4608 | debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level); |
4609 | return 1; |
4610 | } |
4611 | /* "FOR v; do ..." and "for v IN a b; do..." are ok */ |
4612 | if (cpipe->next->res_word == RES_DO) |
4613 | continue; |
4614 | /* next word is not "do". It must be "in" then ("FOR v in ...") */ |
4615 | if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */ |
4616 | || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */ |
4617 | ) { |
4618 | syntax_error("malformed for"); |
4619 | debug_leave(); |
4620 | debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level); |
4621 | return 1; |
4622 | } |
4623 | } |
4624 | #endif |
4625 | |
4626 | /* Past this point, all code paths should jump to ret: label |
4627 | * in order to return, no direct "return" statements please. |
4628 | * This helps to ensure that no memory is leaked. */ |
4629 | |
4630 | #if ENABLE_HUSH_JOB |
4631 | G.run_list_level++; |
4632 | #endif |
4633 | |
4634 | #if HAS_KEYWORDS |
4635 | rword = RES_NONE; |
4636 | last_rword = RES_XXXX; |
4637 | #endif |
4638 | last_followup = PIPE_SEQ; |
4639 | rcode = G.last_exitcode; |
4640 | |
4641 | /* Go through list of pipes, (maybe) executing them. */ |
4642 | for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) { |
4643 | if (G.flag_SIGINT) |
4644 | break; |
4645 | |
4646 | IF_HAS_KEYWORDS(rword = pi->res_word;) |
4647 | debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n", |
4648 | rword, cond_code, last_rword); |
4649 | #if ENABLE_HUSH_LOOPS |
4650 | if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR) |
4651 | && loop_top == NULL /* avoid bumping G.depth_of_loop twice */ |
4652 | ) { |
4653 | /* start of a loop: remember where loop starts */ |
4654 | loop_top = pi; |
4655 | G.depth_of_loop++; |
4656 | } |
4657 | #endif |
4658 | /* Still in the same "if...", "then..." or "do..." branch? */ |
4659 | if (IF_HAS_KEYWORDS(rword == last_rword &&) 1) { |
4660 | if ((rcode == 0 && last_followup == PIPE_OR) |
4661 | || (rcode != 0 && last_followup == PIPE_AND) |
4662 | ) { |
4663 | /* It is "<true> || CMD" or "<false> && CMD" |
4664 | * and we should not execute CMD */ |
4665 | debug_printf_exec("skipped cmd because of || or &&\n"); |
4666 | last_followup = pi->followup; |
4667 | continue; |
4668 | } |
4669 | } |
4670 | last_followup = pi->followup; |
4671 | IF_HAS_KEYWORDS(last_rword = rword;) |
4672 | #if ENABLE_HUSH_IF |
4673 | if (cond_code) { |
4674 | if (rword == RES_THEN) { |
4675 | /* if false; then ... fi has exitcode 0! */ |
4676 | G.last_exitcode = rcode = EXIT_SUCCESS; |
4677 | /* "if <false> THEN cmd": skip cmd */ |
4678 | continue; |
4679 | } |
4680 | } else { |
4681 | if (rword == RES_ELSE || rword == RES_ELIF) { |
4682 | /* "if <true> then ... ELSE/ELIF cmd": |
4683 | * skip cmd and all following ones */ |
4684 | break; |
4685 | } |
4686 | } |
4687 | #endif |
4688 | #if ENABLE_HUSH_LOOPS |
4689 | if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */ |
4690 | if (!for_lcur) { |
4691 | /* first loop through for */ |
4692 | |
4693 | static const char encoded_dollar_at[] ALIGN1 = { |
4694 | SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0' |
4695 | }; /* encoded representation of "$@" */ |
4696 | static const char *const encoded_dollar_at_argv[] = { |
4697 | encoded_dollar_at, NULL |
4698 | }; /* argv list with one element: "$@" */ |
4699 | char **vals; |
4700 | |
4701 | vals = (char**)encoded_dollar_at_argv; |
4702 | if (pi->next->res_word == RES_IN) { |
4703 | /* if no variable values after "in" we skip "for" */ |
4704 | if (!pi->next->cmds[0].argv) { |
4705 | G.last_exitcode = rcode = EXIT_SUCCESS; |
4706 | debug_printf_exec(": null FOR: exitcode EXIT_SUCCESS\n"); |
4707 | break; |
4708 | } |
4709 | vals = pi->next->cmds[0].argv; |
4710 | } /* else: "for var; do..." -> assume "$@" list */ |
4711 | /* create list of variable values */ |
4712 | debug_print_strings("for_list made from", vals); |
4713 | for_list = expand_strvec_to_strvec(vals); |
4714 | for_lcur = for_list; |
4715 | debug_print_strings("for_list", for_list); |
4716 | } |
4717 | if (!*for_lcur) { |
4718 | /* "for" loop is over, clean up */ |
4719 | free(for_list); |
4720 | for_list = NULL; |
4721 | for_lcur = NULL; |
4722 | break; |
4723 | } |
4724 | /* Insert next value from for_lcur */ |
4725 | /* note: *for_lcur already has quotes removed, $var expanded, etc */ |
4726 | set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0], *for_lcur++), /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0); |
4727 | continue; |
4728 | } |
4729 | if (rword == RES_IN) { |
4730 | continue; /* "for v IN list;..." - "in" has no cmds anyway */ |
4731 | } |
4732 | if (rword == RES_DONE) { |
4733 | continue; /* "done" has no cmds too */ |
4734 | } |
4735 | #endif |
4736 | #if ENABLE_HUSH_CASE |
4737 | if (rword == RES_CASE) { |
4738 | case_word = expand_strvec_to_string(pi->cmds->argv); |
4739 | continue; |
4740 | } |
4741 | if (rword == RES_MATCH) { |
4742 | char **argv; |
4743 | |
4744 | if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */ |
4745 | break; |
4746 | /* all prev words didn't match, does this one match? */ |
4747 | argv = pi->cmds->argv; |
4748 | while (*argv) { |
4749 | char *pattern = expand_string_to_string(*argv); |
4750 | /* TODO: which FNM_xxx flags to use? */ |
4751 | cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0); |
4752 | free(pattern); |
4753 | if (cond_code == 0) { /* match! we will execute this branch */ |
4754 | free(case_word); /* make future "word)" stop */ |
4755 | case_word = NULL; |
4756 | break; |
4757 | } |
4758 | argv++; |
4759 | } |
4760 | continue; |
4761 | } |
4762 | if (rword == RES_CASE_BODY) { /* inside of a case branch */ |
4763 | if (cond_code != 0) |
4764 | continue; /* not matched yet, skip this pipe */ |
4765 | } |
4766 | #endif |
4767 | /* Just pressing <enter> in shell should check for jobs. |
4768 | * OTOH, in non-interactive shell this is useless |
4769 | * and only leads to extra job checks */ |
4770 | if (pi->num_cmds == 0) { |
4771 | if (G_interactive_fd) |
4772 | goto check_jobs_and_continue; |
4773 | continue; |
4774 | } |
4775 | |
4776 | /* After analyzing all keywords and conditions, we decided |
4777 | * to execute this pipe. NB: have to do checkjobs(NULL) |
4778 | * after run_pipe to collect any background children, |
4779 | * even if list execution is to be stopped. */ |
4780 | debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds); |
4781 | { |
4782 | int r; |
4783 | #if ENABLE_HUSH_LOOPS |
4784 | G.flag_break_continue = 0; |
4785 | #endif |
4786 | rcode = r = run_pipe(pi); /* NB: rcode is a smallint */ |
4787 | if (r != -1) { |
4788 | /* We ran a builtin, function, or group. |
4789 | * rcode is already known |
4790 | * and we don't need to wait for anything. */ |
4791 | G.last_exitcode = rcode; |
4792 | debug_printf_exec(": builtin/func exitcode %d\n", rcode); |
4793 | check_and_run_traps(0); |
4794 | #if ENABLE_HUSH_LOOPS |
4795 | /* Was it "break" or "continue"? */ |
4796 | if (G.flag_break_continue) { |
4797 | smallint fbc = G.flag_break_continue; |
4798 | /* We might fall into outer *loop*, |
4799 | * don't want to break it too */ |
4800 | if (loop_top) { |
4801 | G.depth_break_continue--; |
4802 | if (G.depth_break_continue == 0) |
4803 | G.flag_break_continue = 0; |
4804 | /* else: e.g. "continue 2" should *break* once, *then* continue */ |
4805 | } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */ |
4806 | if (G.depth_break_continue != 0 || fbc == BC_BREAK) |
4807 | goto check_jobs_and_break; |
4808 | /* "continue": simulate end of loop */ |
4809 | rword = RES_DONE; |
4810 | continue; |
4811 | } |
4812 | #endif |
4813 | #if ENABLE_HUSH_FUNCTIONS |
4814 | if (G.flag_return_in_progress == 1) { |
4815 | /* same as "goto check_jobs_and_break" */ |
4816 | checkjobs(NULL); |
4817 | break; |
4818 | } |
4819 | #endif |
4820 | } else if (pi->followup == PIPE_BG) { |
4821 | /* What does bash do with attempts to background builtins? */ |
4822 | /* even bash 3.2 doesn't do that well with nested bg: |
4823 | * try "{ { sleep 10; echo DEEP; } & echo HERE; } &". |
4824 | * I'm NOT treating inner &'s as jobs */ |
4825 | check_and_run_traps(0); |
4826 | #if ENABLE_HUSH_JOB |
4827 | if (G.run_list_level == 1) |
4828 | insert_bg_job(pi); |
4829 | #endif |
4830 | /* Last command's pid goes to $! */ |
4831 | G.last_bg_pid = pi->cmds[pi->num_cmds - 1].pid; |
4832 | G.last_exitcode = rcode = EXIT_SUCCESS; |
4833 | debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n"); |
4834 | } else { |
4835 | #if ENABLE_HUSH_JOB |
4836 | if (G.run_list_level == 1 && G_interactive_fd) { |
4837 | /* Waits for completion, then fg's main shell */ |
4838 | rcode = checkjobs_and_fg_shell(pi); |
4839 | debug_printf_exec(": checkjobs_and_fg_shell exitcode %d\n", rcode); |
4840 | check_and_run_traps(0); |
4841 | } else |
4842 | #endif |
4843 | { /* This one just waits for completion */ |
4844 | rcode = checkjobs(pi); |
4845 | debug_printf_exec(": checkjobs exitcode %d\n", rcode); |
4846 | check_and_run_traps(0); |
4847 | } |
4848 | G.last_exitcode = rcode; |
4849 | } |
4850 | } |
4851 | |
4852 | /* Analyze how result affects subsequent commands */ |
4853 | #if ENABLE_HUSH_IF |
4854 | if (rword == RES_IF || rword == RES_ELIF) |
4855 | cond_code = rcode; |
4856 | #endif |
4857 | #if ENABLE_HUSH_LOOPS |
4858 | /* Beware of "while false; true; do ..."! */ |
4859 | if (pi->next && pi->next->res_word == RES_DO) { |
4860 | if (rword == RES_WHILE) { |
4861 | if (rcode) { |
4862 | /* "while false; do...done" - exitcode 0 */ |
4863 | G.last_exitcode = rcode = EXIT_SUCCESS; |
4864 | debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n"); |
4865 | goto check_jobs_and_break; |
4866 | } |
4867 | } |
4868 | if (rword == RES_UNTIL) { |
4869 | if (!rcode) { |
4870 | debug_printf_exec(": until expr is true: breaking\n"); |
4871 | check_jobs_and_break: |
4872 | checkjobs(NULL); |
4873 | break; |
4874 | } |
4875 | } |
4876 | } |
4877 | #endif |
4878 | |
4879 | check_jobs_and_continue: |
4880 | checkjobs(NULL); |
4881 | } /* for (pi) */ |
4882 | |
4883 | #if ENABLE_HUSH_JOB |
4884 | G.run_list_level--; |
4885 | #endif |
4886 | #if ENABLE_HUSH_LOOPS |
4887 | if (loop_top) |
4888 | G.depth_of_loop--; |
4889 | free(for_list); |
4890 | #endif |
4891 | #if ENABLE_HUSH_CASE |
4892 | free(case_word); |
4893 | #endif |
4894 | debug_leave(); |
4895 | debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode); |
4896 | return rcode; |
4897 | } |
4898 | |
4899 | /* Select which version we will use */ |
4900 | static int run_and_free_list(struct pipe *pi) |
4901 | { |
4902 | int rcode = 0; |
4903 | debug_printf_exec("run_and_free_list entered\n"); |
4904 | if (!G.fake_mode) { |
4905 | debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds); |
4906 | rcode = run_list(pi); |
4907 | } |
4908 | /* free_pipe_list has the side effect of clearing memory. |
4909 | * In the long run that function can be merged with run_list, |
4910 | * but doing that now would hobble the debugging effort. */ |
4911 | free_pipe_list(pi); |
4912 | debug_printf_exec("run_and_free_list return %d\n", rcode); |
4913 | return rcode; |
4914 | } |
4915 | |
4916 | |
4917 | static struct pipe *new_pipe(void) |
4918 | { |
4919 | struct pipe *pi; |
4920 | pi = xzalloc(sizeof(struct pipe)); |
4921 | /*pi->followup = 0; - deliberately invalid value */ |
4922 | /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */ |
4923 | return pi; |
4924 | } |
4925 | |
4926 | /* Command (member of a pipe) is complete, or we start a new pipe |
4927 | * if ctx->command is NULL. |
4928 | * No errors possible here. |
4929 | */ |
4930 | static int done_command(struct parse_context *ctx) |
4931 | { |
4932 | /* The command is really already in the pipe structure, so |
4933 | * advance the pipe counter and make a new, null command. */ |
4934 | struct pipe *pi = ctx->pipe; |
4935 | struct command *command = ctx->command; |
4936 | |
4937 | if (command) { |
4938 | if (IS_NULL_CMD(command)) { |
4939 | debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds); |
4940 | goto clear_and_ret; |
4941 | } |
4942 | pi->num_cmds++; |
4943 | debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds); |
4944 | //debug_print_tree(ctx->list_head, 20); |
4945 | } else { |
4946 | debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds); |
4947 | } |
4948 | |
4949 | /* Only real trickiness here is that the uncommitted |
4950 | * command structure is not counted in pi->num_cmds. */ |
4951 | pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1)); |
4952 | ctx->command = command = &pi->cmds[pi->num_cmds]; |
4953 | clear_and_ret: |
4954 | memset(command, 0, sizeof(*command)); |
4955 | return pi->num_cmds; /* used only for 0/nonzero check */ |
4956 | } |
4957 | |
4958 | static void done_pipe(struct parse_context *ctx, pipe_style type) |
4959 | { |
4960 | int not_null; |
4961 | |
4962 | debug_printf_parse("done_pipe entered, followup %d\n", type); |
4963 | /* Close previous command */ |
4964 | not_null = done_command(ctx); |
4965 | ctx->pipe->followup = type; |
4966 | #if HAS_KEYWORDS |
4967 | ctx->pipe->pi_inverted = ctx->ctx_inverted; |
4968 | ctx->ctx_inverted = 0; |
4969 | ctx->pipe->res_word = ctx->ctx_res_w; |
4970 | #endif |
4971 | |
4972 | /* Without this check, even just <enter> on command line generates |
4973 | * tree of three NOPs (!). Which is harmless but annoying. |
4974 | * IOW: it is safe to do it unconditionally. */ |
4975 | if (not_null |
4976 | #if ENABLE_HUSH_IF |
4977 | || ctx->ctx_res_w == RES_FI |
4978 | #endif |
4979 | #if ENABLE_HUSH_LOOPS |
4980 | || ctx->ctx_res_w == RES_DONE |
4981 | || ctx->ctx_res_w == RES_FOR |
4982 | || ctx->ctx_res_w == RES_IN |
4983 | #endif |
4984 | #if ENABLE_HUSH_CASE |
4985 | || ctx->ctx_res_w == RES_ESAC |
4986 | #endif |
4987 | ) { |
4988 | struct pipe *new_p; |
4989 | debug_printf_parse("done_pipe: adding new pipe: " |
4990 | "not_null:%d ctx->ctx_res_w:%d\n", |
4991 | not_null, ctx->ctx_res_w); |
4992 | new_p = new_pipe(); |
4993 | ctx->pipe->next = new_p; |
4994 | ctx->pipe = new_p; |
4995 | /* RES_THEN, RES_DO etc are "sticky" - |
4996 | * they remain set for pipes inside if/while. |
4997 | * This is used to control execution. |
4998 | * RES_FOR and RES_IN are NOT sticky (needed to support |
4999 | * cases where variable or value happens to match a keyword): |
5000 | */ |
5001 | #if ENABLE_HUSH_LOOPS |
5002 | if (ctx->ctx_res_w == RES_FOR |
5003 | || ctx->ctx_res_w == RES_IN) |
5004 | ctx->ctx_res_w = RES_NONE; |
5005 | #endif |
5006 | #if ENABLE_HUSH_CASE |
5007 | if (ctx->ctx_res_w == RES_MATCH) |
5008 | ctx->ctx_res_w = RES_CASE_BODY; |
5009 | if (ctx->ctx_res_w == RES_CASE) |
5010 | ctx->ctx_res_w = RES_CASE_IN; |
5011 | #endif |
5012 | ctx->command = NULL; /* trick done_command below */ |
5013 | /* Create the memory for command, roughly: |
5014 | * ctx->pipe->cmds = new struct command; |
5015 | * ctx->command = &ctx->pipe->cmds[0]; |
5016 | */ |
5017 | done_command(ctx); |
5018 | //debug_print_tree(ctx->list_head, 10); |
5019 | } |
5020 | debug_printf_parse("done_pipe return\n"); |
5021 | } |
5022 | |
5023 | static void initialize_context(struct parse_context *ctx) |
5024 | { |
5025 | memset(ctx, 0, sizeof(*ctx)); |
5026 | ctx->pipe = ctx->list_head = new_pipe(); |
5027 | /* Create the memory for command, roughly: |
5028 | * ctx->pipe->cmds = new struct command; |
5029 | * ctx->command = &ctx->pipe->cmds[0]; |
5030 | */ |
5031 | done_command(ctx); |
5032 | } |
5033 | |
5034 | /* If a reserved word is found and processed, parse context is modified |
5035 | * and 1 is returned. |
5036 | */ |
5037 | #if HAS_KEYWORDS |
5038 | struct reserved_combo { |
5039 | char literal[6]; |
5040 | unsigned char res; |
5041 | unsigned char assignment_flag; |
5042 | int flag; |
5043 | }; |
5044 | enum { |
5045 | FLAG_END = (1 << RES_NONE ), |
5046 | # if ENABLE_HUSH_IF |
5047 | FLAG_IF = (1 << RES_IF ), |
5048 | FLAG_THEN = (1 << RES_THEN ), |
5049 | FLAG_ELIF = (1 << RES_ELIF ), |
5050 | FLAG_ELSE = (1 << RES_ELSE ), |
5051 | FLAG_FI = (1 << RES_FI ), |
5052 | # endif |
5053 | # if ENABLE_HUSH_LOOPS |
5054 | FLAG_FOR = (1 << RES_FOR ), |
5055 | FLAG_WHILE = (1 << RES_WHILE), |
5056 | FLAG_UNTIL = (1 << RES_UNTIL), |
5057 | FLAG_DO = (1 << RES_DO ), |
5058 | FLAG_DONE = (1 << RES_DONE ), |
5059 | FLAG_IN = (1 << RES_IN ), |
5060 | # endif |
5061 | # if ENABLE_HUSH_CASE |
5062 | FLAG_MATCH = (1 << RES_MATCH), |
5063 | FLAG_ESAC = (1 << RES_ESAC ), |
5064 | # endif |
5065 | FLAG_START = (1 << RES_XXXX ), |
5066 | }; |
5067 | |
5068 | static const struct reserved_combo* match_reserved_word(o_string *word) |
5069 | { |
5070 | /* Mostly a list of accepted follow-up reserved words. |
5071 | * FLAG_END means we are done with the sequence, and are ready |
5072 | * to turn the compound list into a command. |
5073 | * FLAG_START means the word must start a new compound list. |
5074 | */ |
5075 | static const struct reserved_combo reserved_list[] = { |
5076 | # if ENABLE_HUSH_IF |
5077 | { "!", RES_NONE, NOT_ASSIGNMENT , 0 }, |
5078 | { "if", RES_IF, WORD_IS_KEYWORD, FLAG_THEN | FLAG_START }, |
5079 | { "then", RES_THEN, WORD_IS_KEYWORD, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, |
5080 | { "elif", RES_ELIF, WORD_IS_KEYWORD, FLAG_THEN }, |
5081 | { "else", RES_ELSE, WORD_IS_KEYWORD, FLAG_FI }, |
5082 | { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END }, |
5083 | # endif |
5084 | # if ENABLE_HUSH_LOOPS |
5085 | { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START }, |
5086 | { "while", RES_WHILE, WORD_IS_KEYWORD, FLAG_DO | FLAG_START }, |
5087 | { "until", RES_UNTIL, WORD_IS_KEYWORD, FLAG_DO | FLAG_START }, |
5088 | { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO }, |
5089 | { "do", RES_DO, WORD_IS_KEYWORD, FLAG_DONE }, |
5090 | { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END }, |
5091 | # endif |
5092 | # if ENABLE_HUSH_CASE |
5093 | { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START }, |
5094 | { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END }, |
5095 | # endif |
5096 | }; |
5097 | const struct reserved_combo *r; |
5098 | |
5099 | for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) { |
5100 | if (strcmp(word->data, r->literal) == 0) |
5101 | return r; |
5102 | } |
5103 | return NULL; |
5104 | } |
5105 | /* Return 0: not a keyword, 1: keyword |
5106 | */ |
5107 | static int reserved_word(o_string *word, struct parse_context *ctx) |
5108 | { |
5109 | # if ENABLE_HUSH_CASE |
5110 | static const struct reserved_combo reserved_match = { |
5111 | "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC |
5112 | }; |
5113 | # endif |
5114 | const struct reserved_combo *r; |
5115 | |
5116 | if (word->o_quoted) |
5117 | return 0; |
5118 | r = match_reserved_word(word); |
5119 | if (!r) |
5120 | return 0; |
5121 | |
5122 | debug_printf("found reserved word %s, res %d\n", r->literal, r->res); |
5123 | # if ENABLE_HUSH_CASE |
5124 | if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) { |
5125 | /* "case word IN ..." - IN part starts first MATCH part */ |
5126 | r = &reserved_match; |
5127 | } else |
5128 | # endif |
5129 | if (r->flag == 0) { /* '!' */ |
5130 | if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */ |
5131 | syntax_error("! ! command"); |
5132 | ctx->ctx_res_w = RES_SNTX; |
5133 | } |
5134 | ctx->ctx_inverted = 1; |
5135 | return 1; |
5136 | } |
5137 | if (r->flag & FLAG_START) { |
5138 | struct parse_context *old; |
5139 | |
5140 | old = xmalloc(sizeof(*old)); |
5141 | debug_printf_parse("push stack %p\n", old); |
5142 | *old = *ctx; /* physical copy */ |
5143 | initialize_context(ctx); |
5144 | ctx->stack = old; |
5145 | } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) { |
5146 | syntax_error_at(word->data); |
5147 | ctx->ctx_res_w = RES_SNTX; |
5148 | return 1; |
5149 | } else { |
5150 | /* "{...} fi" is ok. "{...} if" is not |
5151 | * Example: |
5152 | * if { echo foo; } then { echo bar; } fi */ |
5153 | if (ctx->command->group) |
5154 | done_pipe(ctx, PIPE_SEQ); |
5155 | } |
5156 | |
5157 | ctx->ctx_res_w = r->res; |
5158 | ctx->old_flag = r->flag; |
5159 | word->o_assignment = r->assignment_flag; |
5160 | |
5161 | if (ctx->old_flag & FLAG_END) { |
5162 | struct parse_context *old; |
5163 | |
5164 | done_pipe(ctx, PIPE_SEQ); |
5165 | debug_printf_parse("pop stack %p\n", ctx->stack); |
5166 | old = ctx->stack; |
5167 | old->command->group = ctx->list_head; |
5168 | old->command->cmd_type = CMD_NORMAL; |
5169 | # if !BB_MMU |
5170 | o_addstr(&old->as_string, ctx->as_string.data); |
5171 | o_free_unsafe(&ctx->as_string); |
5172 | old->command->group_as_string = xstrdup(old->as_string.data); |
5173 | debug_printf_parse("pop, remembering as:'%s'\n", |
5174 | old->command->group_as_string); |
5175 | # endif |
5176 | *ctx = *old; /* physical copy */ |
5177 | free(old); |
5178 | } |
5179 | return 1; |
5180 | } |
5181 | #endif /* HAS_KEYWORDS */ |
5182 | |
5183 | /* Word is complete, look at it and update parsing context. |
5184 | * Normal return is 0. Syntax errors return 1. |
5185 | * Note: on return, word is reset, but not o_free'd! |
5186 | */ |
5187 | static int done_word(o_string *word, struct parse_context *ctx) |
5188 | { |
5189 | struct command *command = ctx->command; |
5190 | |
5191 | debug_printf_parse("done_word entered: '%s' %p\n", word->data, command); |
5192 | if (word->length == 0 && word->o_quoted == 0) { |
5193 | debug_printf_parse("done_word return 0: true null, ignored\n"); |
5194 | return 0; |
5195 | } |
5196 | |
5197 | if (ctx->pending_redirect) { |
5198 | /* We do not glob in e.g. >*.tmp case. bash seems to glob here |
5199 | * only if run as "bash", not "sh" */ |
5200 | /* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html |
5201 | * "2.7 Redirection |
5202 | * ...the word that follows the redirection operator |
5203 | * shall be subjected to tilde expansion, parameter expansion, |
5204 | * command substitution, arithmetic expansion, and quote |
5205 | * removal. Pathname expansion shall not be performed |
5206 | * on the word by a non-interactive shell; an interactive |
5207 | * shell may perform it, but shall do so only when |
5208 | * the expansion would result in one word." |
5209 | */ |
5210 | ctx->pending_redirect->rd_filename = xstrdup(word->data); |
5211 | /* Cater for >\file case: |
5212 | * >\a creates file a; >\\a, >"\a", >"\\a" create file \a |
5213 | * Same with heredocs: |
5214 | * for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H |
5215 | */ |
5216 | if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) { |
5217 | unbackslash(ctx->pending_redirect->rd_filename); |
5218 | /* Is it <<"HEREDOC"? */ |
5219 | if (word->o_quoted) { |
5220 | ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED; |
5221 | } |
5222 | } |
5223 | debug_printf_parse("word stored in rd_filename: '%s'\n", word->data); |
5224 | ctx->pending_redirect = NULL; |
5225 | } else { |
5226 | /* If this word wasn't an assignment, next ones definitely |
5227 | * can't be assignments. Even if they look like ones. */ |
5228 | if (word->o_assignment != DEFINITELY_ASSIGNMENT |
5229 | && word->o_assignment != WORD_IS_KEYWORD |
5230 | ) { |
5231 | word->o_assignment = NOT_ASSIGNMENT; |
5232 | } else { |
5233 | if (word->o_assignment == DEFINITELY_ASSIGNMENT) |
5234 | command->assignment_cnt++; |
5235 | word->o_assignment = MAYBE_ASSIGNMENT; |
5236 | } |
5237 | |
5238 | #if HAS_KEYWORDS |
5239 | # if ENABLE_HUSH_CASE |
5240 | if (ctx->ctx_dsemicolon |
5241 | && strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */ |
5242 | ) { |
5243 | /* already done when ctx_dsemicolon was set to 1: */ |
5244 | /* ctx->ctx_res_w = RES_MATCH; */ |
5245 | ctx->ctx_dsemicolon = 0; |
5246 | } else |
5247 | # endif |
5248 | if (!command->argv /* if it's the first word... */ |
5249 | # if ENABLE_HUSH_LOOPS |
5250 | && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */ |
5251 | && ctx->ctx_res_w != RES_IN |
5252 | # endif |
5253 | # if ENABLE_HUSH_CASE |
5254 | && ctx->ctx_res_w != RES_CASE |
5255 | # endif |
5256 | ) { |
5257 | debug_printf_parse("checking '%s' for reserved-ness\n", word->data); |
5258 | if (reserved_word(word, ctx)) { |
5259 | o_reset_to_empty_unquoted(word); |
5260 | debug_printf_parse("done_word return %d\n", |
5261 | (ctx->ctx_res_w == RES_SNTX)); |
5262 | return (ctx->ctx_res_w == RES_SNTX); |
5263 | } |
5264 | # ifdef CMD_SINGLEWORD_NOGLOB_COND |
5265 | if (strcmp(word->data, "export") == 0 |
5266 | # if ENABLE_HUSH_LOCAL |
5267 | || strcmp(word->data, "local") == 0 |
5268 | # endif |
5269 | ) { |
5270 | command->cmd_type = CMD_SINGLEWORD_NOGLOB_COND; |
5271 | } else |
5272 | # endif |
5273 | # if ENABLE_HUSH_BASH_COMPAT |
5274 | if (strcmp(word->data, "[[") == 0) { |
5275 | command->cmd_type = CMD_SINGLEWORD_NOGLOB; |
5276 | } |
5277 | /* fall through */ |
5278 | # endif |
5279 | } |
5280 | #endif |
5281 | if (command->group) { |
5282 | /* "{ echo foo; } echo bar" - bad */ |
5283 | syntax_error_at(word->data); |
5284 | debug_printf_parse("done_word return 1: syntax error, " |
5285 | "groups and arglists don't mix\n"); |
5286 | return 1; |
5287 | } |
5288 | if (word->o_quoted /* word had "xx" or 'xx' at least as part of it. */ |
5289 | /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */ |
5290 | && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL) |
5291 | /* (otherwise it's known to be not empty and is already safe) */ |
5292 | ) { |
5293 | /* exclude "$@" - it can expand to no word despite "" */ |
5294 | char *p = word->data; |
5295 | while (p[0] == SPECIAL_VAR_SYMBOL |
5296 | && (p[1] & 0x7f) == '@' |
5297 | && p[2] == SPECIAL_VAR_SYMBOL |
5298 | ) { |
5299 | p += 3; |
5300 | } |
5301 | if (p == word->data || p[0] != '\0') { |
5302 | /* saw no "$@", or not only "$@" but some |
5303 | * real text is there too */ |
5304 | /* insert "empty variable" reference, this makes |
5305 | * e.g. "", $empty"" etc to not disappear */ |
5306 | o_addchr(word, SPECIAL_VAR_SYMBOL); |
5307 | o_addchr(word, SPECIAL_VAR_SYMBOL); |
5308 | } |
5309 | } |
5310 | command->argv = add_string_to_strings(command->argv, xstrdup(word->data)); |
5311 | debug_print_strings("word appended to argv", command->argv); |
5312 | } |
5313 | |
5314 | #if ENABLE_HUSH_LOOPS |
5315 | if (ctx->ctx_res_w == RES_FOR) { |
5316 | if (word->o_quoted |
5317 | || !is_well_formed_var_name(command->argv[0], '\0') |
5318 | ) { |
5319 | /* bash says just "not a valid identifier" */ |
5320 | syntax_error("not a valid identifier in for"); |
5321 | return 1; |
5322 | } |
5323 | /* Force FOR to have just one word (variable name) */ |
5324 | /* NB: basically, this makes hush see "for v in ..." |
5325 | * syntax as if it is "for v; in ...". FOR and IN become |
5326 | * two pipe structs in parse tree. */ |
5327 | done_pipe(ctx, PIPE_SEQ); |
5328 | } |
5329 | #endif |
5330 | #if ENABLE_HUSH_CASE |
5331 | /* Force CASE to have just one word */ |
5332 | if (ctx->ctx_res_w == RES_CASE) { |
5333 | done_pipe(ctx, PIPE_SEQ); |
5334 | } |
5335 | #endif |
5336 | |
5337 | o_reset_to_empty_unquoted(word); |
5338 | |
5339 | debug_printf_parse("done_word return 0\n"); |
5340 | return 0; |
5341 | } |
5342 | |
5343 | |
5344 | /* Peek ahead in the input to find out if we have a "&n" construct, |
5345 | * as in "2>&1", that represents duplicating a file descriptor. |
5346 | * Return: |
5347 | * REDIRFD_CLOSE if >&- "close fd" construct is seen, |
5348 | * REDIRFD_SYNTAX_ERR if syntax error, |
5349 | * REDIRFD_TO_FILE if no & was seen, |
5350 | * or the number found. |
5351 | */ |
5352 | #if BB_MMU |
5353 | #define parse_redir_right_fd(as_string, input) \ |
5354 | parse_redir_right_fd(input) |
5355 | #endif |
5356 | static int parse_redir_right_fd(o_string *as_string, struct in_str *input) |
5357 | { |
5358 | int ch, d, ok; |
5359 | |
5360 | ch = i_peek(input); |
5361 | if (ch != '&') |
5362 | return REDIRFD_TO_FILE; |
5363 | |
5364 | ch = i_getch(input); /* get the & */ |
5365 | nommu_addchr(as_string, ch); |
5366 | ch = i_peek(input); |
5367 | if (ch == '-') { |
5368 | ch = i_getch(input); |
5369 | nommu_addchr(as_string, ch); |
5370 | return REDIRFD_CLOSE; |
5371 | } |
5372 | d = 0; |
5373 | ok = 0; |
5374 | while (ch != EOF && isdigit(ch)) { |
5375 | d = d*10 + (ch-'0'); |
5376 | ok = 1; |
5377 | ch = i_getch(input); |
5378 | nommu_addchr(as_string, ch); |
5379 | ch = i_peek(input); |
5380 | } |
5381 | if (ok) return d; |
5382 | |
5383 | //TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2) |
5384 | |
5385 | bb_error_msg("ambiguous redirect"); |
5386 | return REDIRFD_SYNTAX_ERR; |
5387 | } |
5388 | |
5389 | /* Return code is 0 normal, 1 if a syntax error is detected |
5390 | */ |
5391 | static int parse_redirect(struct parse_context *ctx, |
5392 | int fd, |
5393 | redir_type style, |
5394 | struct in_str *input) |
5395 | { |
5396 | struct command *command = ctx->command; |
5397 | struct redir_struct *redir; |
5398 | struct redir_struct **redirp; |
5399 | int dup_num; |
5400 | |
5401 | dup_num = REDIRFD_TO_FILE; |
5402 | if (style != REDIRECT_HEREDOC) { |
5403 | /* Check for a '>&1' type redirect */ |
5404 | dup_num = parse_redir_right_fd(&ctx->as_string, input); |
5405 | if (dup_num == REDIRFD_SYNTAX_ERR) |
5406 | return 1; |
5407 | } else { |
5408 | int ch = i_peek(input); |
5409 | dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */ |
5410 | if (dup_num) { /* <<-... */ |
5411 | ch = i_getch(input); |
5412 | nommu_addchr(&ctx->as_string, ch); |
5413 | ch = i_peek(input); |
5414 | } |
5415 | } |
5416 | |
5417 | if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) { |
5418 | int ch = i_peek(input); |
5419 | if (ch == '|') { |
5420 | /* >|FILE redirect ("clobbering" >). |
5421 | * Since we do not support "set -o noclobber" yet, |
5422 | * >| and > are the same for now. Just eat |. |
5423 | */ |
5424 | ch = i_getch(input); |
5425 | nommu_addchr(&ctx->as_string, ch); |
5426 | } |
5427 | } |
5428 | |
5429 | /* Create a new redir_struct and append it to the linked list */ |
5430 | redirp = &command->redirects; |
5431 | while ((redir = *redirp) != NULL) { |
5432 | redirp = &(redir->next); |
5433 | } |
5434 | *redirp = redir = xzalloc(sizeof(*redir)); |
5435 | /* redir->next = NULL; */ |
5436 | /* redir->rd_filename = NULL; */ |
5437 | redir->rd_type = style; |
5438 | redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd; |
5439 | |
5440 | debug_printf_parse("redirect type %d %s\n", redir->rd_fd, |
5441 | redir_table[style].descrip); |
5442 | |
5443 | redir->rd_dup = dup_num; |
5444 | if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) { |
5445 | /* Erik had a check here that the file descriptor in question |
5446 | * is legit; I postpone that to "run time" |
5447 | * A "-" representation of "close me" shows up as a -3 here */ |
5448 | debug_printf_parse("duplicating redirect '%d>&%d'\n", |
5449 | redir->rd_fd, redir->rd_dup); |
5450 | } else { |
5451 | /* Set ctx->pending_redirect, so we know what to do at the |
5452 | * end of the next parsed word. */ |
5453 | ctx->pending_redirect = redir; |
5454 | } |
5455 | return 0; |
5456 | } |
5457 | |
5458 | /* If a redirect is immediately preceded by a number, that number is |
5459 | * supposed to tell which file descriptor to redirect. This routine |
5460 | * looks for such preceding numbers. In an ideal world this routine |
5461 | * needs to handle all the following classes of redirects... |
5462 | * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo |
5463 | * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo |
5464 | * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo |
5465 | * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo |
5466 | * |
5467 | * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html |
5468 | * "2.7 Redirection |
5469 | * ... If n is quoted, the number shall not be recognized as part of |
5470 | * the redirection expression. For example: |
5471 | * echo \2>a |
5472 | * writes the character 2 into file a" |
5473 | * We are getting it right by setting ->o_quoted on any \<char> |
5474 | * |
5475 | * A -1 return means no valid number was found, |
5476 | * the caller should use the appropriate default for this redirection. |
5477 | */ |
5478 | static int redirect_opt_num(o_string *o) |
5479 | { |
5480 | int num; |
5481 | |
5482 | if (o->data == NULL) |
5483 | return -1; |
5484 | num = bb_strtou(o->data, NULL, 10); |
5485 | if (errno || num < 0) |
5486 | return -1; |
5487 | o_reset_to_empty_unquoted(o); |
5488 | return num; |
5489 | } |
5490 | |
5491 | #if BB_MMU |
5492 | #define fetch_till_str(as_string, input, word, skip_tabs) \ |
5493 | fetch_till_str(input, word, skip_tabs) |
5494 | #endif |
5495 | static char *fetch_till_str(o_string *as_string, |
5496 | struct in_str *input, |
5497 | const char *word, |
5498 | int skip_tabs) |
5499 | { |
5500 | o_string heredoc = NULL_O_STRING; |
5501 | int past_EOL = 0; |
5502 | int ch; |
5503 | |
5504 | goto jump_in; |
5505 | while (1) { |
5506 | ch = i_getch(input); |
5507 | nommu_addchr(as_string, ch); |
5508 | if (ch == '\n') { |
5509 | if (strcmp(heredoc.data + past_EOL, word) == 0) { |
5510 | heredoc.data[past_EOL] = '\0'; |
5511 | debug_printf_parse("parsed heredoc '%s'\n", heredoc.data); |
5512 | return heredoc.data; |
5513 | } |
5514 | do { |
5515 | o_addchr(&heredoc, ch); |
5516 | past_EOL = heredoc.length; |
5517 | jump_in: |
5518 | do { |
5519 | ch = i_getch(input); |
5520 | nommu_addchr(as_string, ch); |
5521 | } while (skip_tabs && ch == '\t'); |
5522 | } while (ch == '\n'); |
5523 | } |
5524 | if (ch == EOF) { |
5525 | o_free_unsafe(&heredoc); |
5526 | return NULL; |
5527 | } |
5528 | o_addchr(&heredoc, ch); |
5529 | nommu_addchr(as_string, ch); |
5530 | } |
5531 | } |
5532 | |
5533 | /* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs |
5534 | * and load them all. There should be exactly heredoc_cnt of them. |
5535 | */ |
5536 | static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_str *input) |
5537 | { |
5538 | struct pipe *pi = ctx->list_head; |
5539 | |
5540 | while (pi && heredoc_cnt) { |
5541 | int i; |
5542 | struct command *cmd = pi->cmds; |
5543 | |
5544 | debug_printf_parse("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n", |
5545 | pi->num_cmds, |
5546 | cmd->argv ? cmd->argv[0] : "NONE"); |
5547 | for (i = 0; i < pi->num_cmds; i++) { |
5548 | struct redir_struct *redir = cmd->redirects; |
5549 | |
5550 | debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n", |
5551 | i, cmd->argv ? cmd->argv[0] : "NONE"); |
5552 | while (redir) { |
5553 | if (redir->rd_type == REDIRECT_HEREDOC) { |
5554 | char *p; |
5555 | |
5556 | redir->rd_type = REDIRECT_HEREDOC2; |
5557 | /* redir->rd_dup is (ab)used to indicate <<- */ |
5558 | p = fetch_till_str(&ctx->as_string, input, |
5559 | redir->rd_filename, redir->rd_dup & HEREDOC_SKIPTABS); |
5560 | if (!p) { |
5561 | syntax_error("unexpected EOF in here document"); |
5562 | return 1; |
5563 | } |
5564 | free(redir->rd_filename); |
5565 | redir->rd_filename = p; |
5566 | heredoc_cnt--; |
5567 | } |
5568 | redir = redir->next; |
5569 | } |
5570 | cmd++; |
5571 | } |
5572 | pi = pi->next; |
5573 | } |
5574 | #if 0 |
5575 | /* Should be 0. If it isn't, it's a parse error */ |
5576 | if (heredoc_cnt) |
5577 | bb_error_msg_and_die("heredoc BUG 2"); |
5578 | #endif |
5579 | return 0; |
5580 | } |
5581 | |
5582 | |
5583 | #if ENABLE_HUSH_TICK |
5584 | static FILE *generate_stream_from_string(const char *s, pid_t *pid_p) |
5585 | { |
5586 | pid_t pid; |
5587 | int channel[2]; |
5588 | # if !BB_MMU |
5589 | char **to_free = NULL; |
5590 | # endif |
5591 | |
5592 | xpipe(channel); |
5593 | pid = BB_MMU ? xfork() : xvfork(); |
5594 | if (pid == 0) { /* child */ |
5595 | disable_restore_tty_pgrp_on_exit(); |
5596 | /* Process substitution is not considered to be usual |
5597 | * 'command execution'. |
5598 | * SUSv3 says ctrl-Z should be ignored, ctrl-C should not. |
5599 | */ |
5600 | bb_signals(0 |
5601 | + (1 << SIGTSTP) |
5602 | + (1 << SIGTTIN) |
5603 | + (1 << SIGTTOU) |
5604 | , SIG_IGN); |
5605 | CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */ |
5606 | close(channel[0]); /* NB: close _first_, then move fd! */ |
5607 | xmove_fd(channel[1], 1); |
5608 | /* Prevent it from trying to handle ctrl-z etc */ |
5609 | IF_HUSH_JOB(G.run_list_level = 1;) |
5610 | /* Awful hack for `trap` or $(trap). |
5611 | * |
5612 | * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html |
5613 | * contains an example where "trap" is executed in a subshell: |
5614 | * |
5615 | * save_traps=$(trap) |
5616 | * ... |
5617 | * eval "$save_traps" |
5618 | * |
5619 | * Standard does not say that "trap" in subshell shall print |
5620 | * parent shell's traps. It only says that its output |
5621 | * must have suitable form, but then, in the above example |
5622 | * (which is not supposed to be normative), it implies that. |
5623 | * |
5624 | * bash (and probably other shell) does implement it |
5625 | * (traps are reset to defaults, but "trap" still shows them), |
5626 | * but as a result, "trap" logic is hopelessly messed up: |
5627 | * |
5628 | * # trap |
5629 | * trap -- 'echo Ho' SIGWINCH <--- we have a handler |
5630 | * # (trap) <--- trap is in subshell - no output (correct, traps are reset) |
5631 | * # true | trap <--- trap is in subshell - no output (ditto) |
5632 | * # echo `true | trap` <--- in subshell - output (but traps are reset!) |
5633 | * trap -- 'echo Ho' SIGWINCH |
5634 | * # echo `(trap)` <--- in subshell in subshell - output |
5635 | * trap -- 'echo Ho' SIGWINCH |
5636 | * # echo `true | (trap)` <--- in subshell in subshell in subshell - output! |
5637 | * trap -- 'echo Ho' SIGWINCH |
5638 | * |
5639 | * The rules when to forget and when to not forget traps |
5640 | * get really complex and nonsensical. |
5641 | * |
5642 | * Our solution: ONLY bare $(trap) or `trap` is special. |
5643 | */ |
5644 | s = skip_whitespace(s); |
5645 | if (strncmp(s, "trap", 4) == 0 && (*skip_whitespace(s + 4) == '\0')) |
5646 | { |
5647 | static const char *const argv[] = { NULL, NULL }; |
5648 | builtin_trap((char**)argv); |
5649 | exit(0); /* not _exit() - we need to fflush */ |
5650 | } |
5651 | # if BB_MMU |
5652 | reset_traps_to_defaults(); |
5653 | parse_and_run_string(s); |
5654 | _exit(G.last_exitcode); |
5655 | # else |
5656 | /* We re-execute after vfork on NOMMU. This makes this script safe: |
5657 | * yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG |
5658 | * huge=`cat BIG` # was blocking here forever |
5659 | * echo OK |
5660 | */ |
5661 | re_execute_shell(&to_free, |
5662 | s, |
5663 | G.global_argv[0], |
5664 | G.global_argv + 1, |
5665 | NULL); |
5666 | # endif |
5667 | } |
5668 | |
5669 | /* parent */ |
5670 | *pid_p = pid; |
5671 | # if ENABLE_HUSH_FAST |
5672 | G.count_SIGCHLD++; |
5673 | //bb_error_msg("[%d] fork in generate_stream_from_string: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD); |
5674 | # endif |
5675 | enable_restore_tty_pgrp_on_exit(); |
5676 | # if !BB_MMU |
5677 | free(to_free); |
5678 | # endif |
5679 | close(channel[1]); |
5680 | close_on_exec_on(channel[0]); |
5681 | return xfdopen_for_read(channel[0]); |
5682 | } |
5683 | |
5684 | /* Return code is exit status of the process that is run. */ |
5685 | static int process_command_subs(o_string *dest, const char *s) |
5686 | { |
5687 | FILE *fp; |
5688 | struct in_str pipe_str; |
5689 | pid_t pid; |
5690 | int status, ch, eol_cnt; |
5691 | |
5692 | fp = generate_stream_from_string(s, &pid); |
5693 | |
5694 | /* Now send results of command back into original context */ |
5695 | setup_file_in_str(&pipe_str, fp); |
5696 | eol_cnt = 0; |
5697 | while ((ch = i_getch(&pipe_str)) != EOF) { |
5698 | if (ch == '\n') { |
5699 | eol_cnt++; |
5700 | continue; |
5701 | } |
5702 | while (eol_cnt) { |
5703 | o_addchr(dest, '\n'); |
5704 | eol_cnt--; |
5705 | } |
5706 | o_addQchr(dest, ch); |
5707 | } |
5708 | |
5709 | debug_printf("done reading from `cmd` pipe, closing it\n"); |
5710 | fclose(fp); |
5711 | /* We need to extract exitcode. Test case |
5712 | * "true; echo `sleep 1; false` $?" |
5713 | * should print 1 */ |
5714 | safe_waitpid(pid, &status, 0); |
5715 | debug_printf("child exited. returning its exitcode:%d\n", WEXITSTATUS(status)); |
5716 | return WEXITSTATUS(status); |
5717 | } |
5718 | #endif /* ENABLE_HUSH_TICK */ |
5719 | |
5720 | #if !ENABLE_HUSH_FUNCTIONS |
5721 | #define parse_group(dest, ctx, input, ch) \ |
5722 | parse_group(ctx, input, ch) |
5723 | #endif |
5724 | static int parse_group(o_string *dest, struct parse_context *ctx, |
5725 | struct in_str *input, int ch) |
5726 | { |
5727 | /* dest contains characters seen prior to ( or {. |
5728 | * Typically it's empty, but for function defs, |
5729 | * it contains function name (without '()'). */ |
5730 | struct pipe *pipe_list; |
5731 | int endch; |
5732 | struct command *command = ctx->command; |
5733 | |
5734 | debug_printf_parse("parse_group entered\n"); |
5735 | #if ENABLE_HUSH_FUNCTIONS |
5736 | if (ch == '(' && !dest->o_quoted) { |
5737 | if (dest->length) |
5738 | if (done_word(dest, ctx)) |
5739 | return 1; |
5740 | if (!command->argv) |
5741 | goto skip; /* (... */ |
5742 | if (command->argv[1]) { /* word word ... (... */ |
5743 | syntax_error_unexpected_ch('('); |
5744 | return 1; |
5745 | } |
5746 | /* it is "word(..." or "word (..." */ |
5747 | do |
5748 | ch = i_getch(input); |
5749 | while (ch == ' ' || ch == '\t'); |
5750 | if (ch != ')') { |
5751 | syntax_error_unexpected_ch(ch); |
5752 | return 1; |
5753 | } |
5754 | nommu_addchr(&ctx->as_string, ch); |
5755 | do |
5756 | ch = i_getch(input); |
5757 | while (ch == ' ' || ch == '\t' || ch == '\n'); |
5758 | if (ch != '{') { |
5759 | syntax_error_unexpected_ch(ch); |
5760 | return 1; |
5761 | } |
5762 | nommu_addchr(&ctx->as_string, ch); |
5763 | command->cmd_type = CMD_FUNCDEF; |
5764 | goto skip; |
5765 | } |
5766 | #endif |
5767 | |
5768 | #if 0 /* Prevented by caller */ |
5769 | if (command->argv /* word [word]{... */ |
5770 | || dest->length /* word{... */ |
5771 | || dest->o_quoted /* ""{... */ |
5772 | ) { |
5773 | syntax_error(NULL); |
5774 | debug_printf_parse("parse_group return 1: " |
5775 | "syntax error, groups and arglists don't mix\n"); |
5776 | return 1; |
5777 | } |
5778 | #endif |
5779 | |
5780 | #if ENABLE_HUSH_FUNCTIONS |
5781 | skip: |
5782 | #endif |
5783 | endch = '}'; |
5784 | if (ch == '(') { |
5785 | endch = ')'; |
5786 | command->cmd_type = CMD_SUBSHELL; |
5787 | } else { |
5788 | /* bash does not allow "{echo...", requires whitespace */ |
5789 | ch = i_getch(input); |
5790 | if (ch != ' ' && ch != '\t' && ch != '\n') { |
5791 | syntax_error_unexpected_ch(ch); |
5792 | return 1; |
5793 | } |
5794 | nommu_addchr(&ctx->as_string, ch); |
5795 | } |
5796 | |
5797 | { |
5798 | #if BB_MMU |
5799 | # define as_string NULL |
5800 | #else |
5801 | char *as_string = NULL; |
5802 | #endif |
5803 | pipe_list = parse_stream(&as_string, input, endch); |
5804 | #if !BB_MMU |
5805 | if (as_string) |
5806 | o_addstr(&ctx->as_string, as_string); |
5807 | #endif |
5808 | /* empty ()/{} or parse error? */ |
5809 | if (!pipe_list || pipe_list == ERR_PTR) { |
5810 | /* parse_stream already emitted error msg */ |
5811 | if (!BB_MMU) |
5812 | free(as_string); |
5813 | debug_printf_parse("parse_group return 1: " |
5814 | "parse_stream returned %p\n", pipe_list); |
5815 | return 1; |
5816 | } |
5817 | command->group = pipe_list; |
5818 | #if !BB_MMU |
5819 | as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */ |
5820 | command->group_as_string = as_string; |
5821 | debug_printf_parse("end of group, remembering as:'%s'\n", |
5822 | command->group_as_string); |
5823 | #endif |
5824 | #undef as_string |
5825 | } |
5826 | debug_printf_parse("parse_group return 0\n"); |
5827 | return 0; |
5828 | /* command remains "open", available for possible redirects */ |
5829 | } |
5830 | |
5831 | #if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS |
5832 | /* Subroutines for copying $(...) and `...` things */ |
5833 | static void add_till_backquote(o_string *dest, struct in_str *input); |
5834 | /* '...' */ |
5835 | static void add_till_single_quote(o_string *dest, struct in_str *input) |
5836 | { |
5837 | while (1) { |
5838 | int ch = i_getch(input); |
5839 | if (ch == EOF) { |
5840 | syntax_error_unterm_ch('\''); |
5841 | /*xfunc_die(); - redundant */ |
5842 | } |
5843 | if (ch == '\'') |
5844 | return; |
5845 | o_addchr(dest, ch); |
5846 | } |
5847 | } |
5848 | /* "...\"...`..`...." - do we need to handle "...$(..)..." too? */ |
5849 | static void add_till_double_quote(o_string *dest, struct in_str *input) |
5850 | { |
5851 | while (1) { |
5852 | int ch = i_getch(input); |
5853 | if (ch == EOF) { |
5854 | syntax_error_unterm_ch('"'); |
5855 | /*xfunc_die(); - redundant */ |
5856 | } |
5857 | if (ch == '"') |
5858 | return; |
5859 | if (ch == '\\') { /* \x. Copy both chars. */ |
5860 | o_addchr(dest, ch); |
5861 | ch = i_getch(input); |
5862 | } |
5863 | o_addchr(dest, ch); |
5864 | if (ch == '`') { |
5865 | add_till_backquote(dest, input); |
5866 | o_addchr(dest, ch); |
5867 | continue; |
5868 | } |
5869 | //if (ch == '$') ... |
5870 | } |
5871 | } |
5872 | /* Process `cmd` - copy contents until "`" is seen. Complicated by |
5873 | * \` quoting. |
5874 | * "Within the backquoted style of command substitution, backslash |
5875 | * shall retain its literal meaning, except when followed by: '$', '`', or '\'. |
5876 | * The search for the matching backquote shall be satisfied by the first |
5877 | * backquote found without a preceding backslash; during this search, |
5878 | * if a non-escaped backquote is encountered within a shell comment, |
5879 | * a here-document, an embedded command substitution of the $(command) |
5880 | * form, or a quoted string, undefined results occur. A single-quoted |
5881 | * or double-quoted string that begins, but does not end, within the |
5882 | * "`...`" sequence produces undefined results." |
5883 | * Example Output |
5884 | * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST |
5885 | */ |
5886 | static void add_till_backquote(o_string *dest, struct in_str *input) |
5887 | { |
5888 | while (1) { |
5889 | int ch = i_getch(input); |
5890 | if (ch == EOF) { |
5891 | syntax_error_unterm_ch('`'); |
5892 | /*xfunc_die(); - redundant */ |
5893 | } |
5894 | if (ch == '`') |
5895 | return; |
5896 | if (ch == '\\') { |
5897 | /* \x. Copy both chars unless it is \` */ |
5898 | int ch2 = i_getch(input); |
5899 | if (ch2 == EOF) { |
5900 | syntax_error_unterm_ch('`'); |
5901 | /*xfunc_die(); - redundant */ |
5902 | } |
5903 | if (ch2 != '`' && ch2 != '$' && ch2 != '\\') |
5904 | o_addchr(dest, ch); |
5905 | ch = ch2; |
5906 | } |
5907 | o_addchr(dest, ch); |
5908 | } |
5909 | } |
5910 | /* Process $(cmd) - copy contents until ")" is seen. Complicated by |
5911 | * quoting and nested ()s. |
5912 | * "With the $(command) style of command substitution, all characters |
5913 | * following the open parenthesis to the matching closing parenthesis |
5914 | * constitute the command. Any valid shell script can be used for command, |
5915 | * except a script consisting solely of redirections which produces |
5916 | * unspecified results." |
5917 | * Example Output |
5918 | * echo $(echo '(TEST)' BEST) (TEST) BEST |
5919 | * echo $(echo 'TEST)' BEST) TEST) BEST |
5920 | * echo $(echo \(\(TEST\) BEST) ((TEST) BEST |
5921 | * |
5922 | * Also adapted to eat ${var%...} and $((...)) constructs, since ... part |
5923 | * can contain arbitrary constructs, just like $(cmd). |
5924 | * In bash compat mode, it needs to also be able to stop on '}' or ':' |
5925 | * for ${var:N[:M]} parsing. |
5926 | */ |
5927 | #define DOUBLE_CLOSE_CHAR_FLAG 0x80 |
5928 | static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsigned end_ch) |
5929 | { |
5930 | int ch; |
5931 | char dbl = end_ch & DOUBLE_CLOSE_CHAR_FLAG; |
5932 | # if ENABLE_HUSH_BASH_COMPAT |
5933 | char end_char2 = end_ch >> 8; |
5934 | # endif |
5935 | end_ch &= (DOUBLE_CLOSE_CHAR_FLAG - 1); |
5936 | |
5937 | while (1) { |
5938 | ch = i_getch(input); |
5939 | if (ch == EOF) { |
5940 | syntax_error_unterm_ch(end_ch); |
5941 | /*xfunc_die(); - redundant */ |
5942 | } |
5943 | if (ch == end_ch IF_HUSH_BASH_COMPAT( || ch == end_char2)) { |
5944 | if (!dbl) |
5945 | break; |
5946 | /* we look for closing )) of $((EXPR)) */ |
5947 | if (i_peek(input) == end_ch) { |
5948 | i_getch(input); /* eat second ')' */ |
5949 | break; |
5950 | } |
5951 | } |
5952 | o_addchr(dest, ch); |
5953 | if (ch == '(' || ch == '{') { |
5954 | ch = (ch == '(' ? ')' : '}'); |
5955 | add_till_closing_bracket(dest, input, ch); |
5956 | o_addchr(dest, ch); |
5957 | continue; |
5958 | } |
5959 | if (ch == '\'') { |
5960 | add_till_single_quote(dest, input); |
5961 | o_addchr(dest, ch); |
5962 | continue; |
5963 | } |
5964 | if (ch == '"') { |
5965 | add_till_double_quote(dest, input); |
5966 | o_addchr(dest, ch); |
5967 | continue; |
5968 | } |
5969 | if (ch == '`') { |
5970 | add_till_backquote(dest, input); |
5971 | o_addchr(dest, ch); |
5972 | continue; |
5973 | } |
5974 | if (ch == '\\') { |
5975 | /* \x. Copy verbatim. Important for \(, \) */ |
5976 | ch = i_getch(input); |
5977 | if (ch == EOF) { |
5978 | syntax_error_unterm_ch(')'); |
5979 | /*xfunc_die(); - redundant */ |
5980 | } |
5981 | o_addchr(dest, ch); |
5982 | continue; |
5983 | } |
5984 | } |
5985 | return ch; |
5986 | } |
5987 | #endif /* ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS */ |
5988 | |
5989 | /* Return code: 0 for OK, 1 for syntax error */ |
5990 | #if BB_MMU |
5991 | #define parse_dollar(as_string, dest, input) \ |
5992 | parse_dollar(dest, input) |
5993 | #define as_string NULL |
5994 | #endif |
5995 | static int parse_dollar(o_string *as_string, |
5996 | o_string *dest, |
5997 | struct in_str *input) |
5998 | { |
5999 | int ch = i_peek(input); /* first character after the $ */ |
6000 | unsigned char quote_mask = dest->o_escape ? 0x80 : 0; |
6001 | |
6002 | debug_printf_parse("parse_dollar entered: ch='%c'\n", ch); |
6003 | if (isalpha(ch)) { |
6004 | ch = i_getch(input); |
6005 | nommu_addchr(as_string, ch); |
6006 | make_var: |
6007 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6008 | while (1) { |
6009 | debug_printf_parse(": '%c'\n", ch); |
6010 | o_addchr(dest, ch | quote_mask); |
6011 | quote_mask = 0; |
6012 | ch = i_peek(input); |
6013 | if (!isalnum(ch) && ch != '_') |
6014 | break; |
6015 | ch = i_getch(input); |
6016 | nommu_addchr(as_string, ch); |
6017 | } |
6018 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6019 | } else if (isdigit(ch)) { |
6020 | make_one_char_var: |
6021 | ch = i_getch(input); |
6022 | nommu_addchr(as_string, ch); |
6023 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6024 | debug_printf_parse(": '%c'\n", ch); |
6025 | o_addchr(dest, ch | quote_mask); |
6026 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6027 | } else switch (ch) { |
6028 | case '$': /* pid */ |
6029 | case '!': /* last bg pid */ |
6030 | case '?': /* last exit code */ |
6031 | case '#': /* number of args */ |
6032 | case '*': /* args */ |
6033 | case '@': /* args */ |
6034 | goto make_one_char_var; |
6035 | case '{': { |
6036 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6037 | |
6038 | ch = i_getch(input); /* eat '{' */ |
6039 | nommu_addchr(as_string, ch); |
6040 | |
6041 | ch = i_getch(input); /* first char after '{' */ |
6042 | nommu_addchr(as_string, ch); |
6043 | /* It should be ${?}, or ${#var}, |
6044 | * or even ${?+subst} - operator acting on a special variable, |
6045 | * or the beginning of variable name. |
6046 | */ |
6047 | if (!strchr(_SPECIAL_VARS_STR, ch) && !isalnum(ch)) { /* not one of those */ |
6048 | bad_dollar_syntax: |
6049 | syntax_error_unterm_str("${name}"); |
6050 | debug_printf_parse("parse_dollar return 1: unterminated ${name}\n"); |
6051 | return 1; |
6052 | } |
6053 | ch |= quote_mask; |
6054 | |
6055 | /* It's possible to just call add_till_closing_bracket() at this point. |
6056 | * However, this regresses some of our testsuite cases |
6057 | * which check invalid constructs like ${%}. |
6058 | * Oh well... let's check that the var name part is fine... */ |
6059 | |
6060 | while (1) { |
6061 | unsigned pos; |
6062 | |
6063 | o_addchr(dest, ch); |
6064 | debug_printf_parse(": '%c'\n", ch); |
6065 | |
6066 | ch = i_getch(input); |
6067 | nommu_addchr(as_string, ch); |
6068 | if (ch == '}') |
6069 | break; |
6070 | |
6071 | if (!isalnum(ch) && ch != '_') { |
6072 | unsigned end_ch; |
6073 | unsigned char last_ch; |
6074 | /* handle parameter expansions |
6075 | * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02 |
6076 | */ |
6077 | if (!strchr("%#:-=+?", ch)) /* ${var<bad_char>... */ |
6078 | goto bad_dollar_syntax; |
6079 | o_addchr(dest, ch); |
6080 | |
6081 | /* Eat everything until closing '}' (or ':') */ |
6082 | end_ch = '}'; |
6083 | if (ENABLE_HUSH_BASH_COMPAT |
6084 | && ch == ':' |
6085 | && !strchr("%#:-=+?"+3, i_peek(input)) |
6086 | ) { |
6087 | /* It's ${var:N[:M]} thing */ |
6088 | end_ch = '}' * 0x100 + ':'; |
6089 | } |
6090 | again: |
6091 | if (!BB_MMU) |
6092 | pos = dest->length; |
6093 | #if ENABLE_HUSH_DOLLAR_OPS |
6094 | last_ch = add_till_closing_bracket(dest, input, end_ch); |
6095 | #else |
6096 | #error Simple code to only allow ${var} is not implemented |
6097 | #endif |
6098 | if (as_string) { |
6099 | o_addstr(as_string, dest->data + pos); |
6100 | o_addchr(as_string, last_ch); |
6101 | } |
6102 | |
6103 | if (ENABLE_HUSH_BASH_COMPAT && (end_ch & 0xff00)) { |
6104 | /* close the first block: */ |
6105 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6106 | /* while parsing N from ${var:N[:M]}... */ |
6107 | if ((end_ch & 0xff) == last_ch) { |
6108 | /* ...got ':' - parse the rest */ |
6109 | end_ch = '}'; |
6110 | goto again; |
6111 | } |
6112 | /* ...got '}', not ':' - it's ${var:N}! emulate :999999999 */ |
6113 | o_addstr(dest, "999999999"); |
6114 | } |
6115 | break; |
6116 | } |
6117 | } |
6118 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6119 | break; |
6120 | } |
6121 | #if ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_TICK |
6122 | case '(': { |
6123 | unsigned pos; |
6124 | |
6125 | ch = i_getch(input); |
6126 | nommu_addchr(as_string, ch); |
6127 | # if ENABLE_SH_MATH_SUPPORT |
6128 | if (i_peek(input) == '(') { |
6129 | ch = i_getch(input); |
6130 | nommu_addchr(as_string, ch); |
6131 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6132 | o_addchr(dest, /*quote_mask |*/ '+'); |
6133 | if (!BB_MMU) |
6134 | pos = dest->length; |
6135 | add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG); |
6136 | if (as_string) { |
6137 | o_addstr(as_string, dest->data + pos); |
6138 | o_addchr(as_string, ')'); |
6139 | o_addchr(as_string, ')'); |
6140 | } |
6141 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6142 | break; |
6143 | } |
6144 | # endif |
6145 | # if ENABLE_HUSH_TICK |
6146 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6147 | o_addchr(dest, quote_mask | '`'); |
6148 | if (!BB_MMU) |
6149 | pos = dest->length; |
6150 | add_till_closing_bracket(dest, input, ')'); |
6151 | if (as_string) { |
6152 | o_addstr(as_string, dest->data + pos); |
6153 | o_addchr(as_string, ')'); |
6154 | } |
6155 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6156 | # endif |
6157 | break; |
6158 | } |
6159 | #endif |
6160 | case '_': |
6161 | ch = i_getch(input); |
6162 | nommu_addchr(as_string, ch); |
6163 | ch = i_peek(input); |
6164 | if (isalnum(ch)) { /* it's $_name or $_123 */ |
6165 | ch = '_'; |
6166 | goto make_var; |
6167 | } |
6168 | /* else: it's $_ */ |
6169 | /* TODO: $_ and $-: */ |
6170 | /* $_ Shell or shell script name; or last argument of last command |
6171 | * (if last command wasn't a pipe; if it was, bash sets $_ to ""); |
6172 | * but in command's env, set to full pathname used to invoke it */ |
6173 | /* $- Option flags set by set builtin or shell options (-i etc) */ |
6174 | default: |
6175 | o_addQchr(dest, '$'); |
6176 | } |
6177 | debug_printf_parse("parse_dollar return 0\n"); |
6178 | return 0; |
6179 | #undef as_string |
6180 | } |
6181 | |
6182 | #if BB_MMU |
6183 | #define parse_stream_dquoted(as_string, dest, input, dquote_end) \ |
6184 | parse_stream_dquoted(dest, input, dquote_end) |
6185 | #define as_string NULL |
6186 | #endif |
6187 | static int parse_stream_dquoted(o_string *as_string, |
6188 | o_string *dest, |
6189 | struct in_str *input, |
6190 | int dquote_end) |
6191 | { |
6192 | int ch; |
6193 | int next; |
6194 | |
6195 | again: |
6196 | ch = i_getch(input); |
6197 | if (ch != EOF) |
6198 | nommu_addchr(as_string, ch); |
6199 | if (ch == dquote_end) { /* may be only '"' or EOF */ |
6200 | if (dest->o_assignment == NOT_ASSIGNMENT) |
6201 | dest->o_escape ^= 1; |
6202 | debug_printf_parse("parse_stream_dquoted return 0\n"); |
6203 | return 0; |
6204 | } |
6205 | /* note: can't move it above ch == dquote_end check! */ |
6206 | if (ch == EOF) { |
6207 | syntax_error_unterm_ch('"'); |
6208 | /*xfunc_die(); - redundant */ |
6209 | } |
6210 | next = '\0'; |
6211 | if (ch != '\n') { |
6212 | next = i_peek(input); |
6213 | } |
6214 | debug_printf_parse("\" ch=%c (%d) escape=%d\n", |
6215 | ch, ch, dest->o_escape); |
6216 | if (ch == '\\') { |
6217 | if (next == EOF) { |
6218 | syntax_error("\\<eof>"); |
6219 | xfunc_die(); |
6220 | } |
6221 | /* bash: |
6222 | * "The backslash retains its special meaning [in "..."] |
6223 | * only when followed by one of the following characters: |
6224 | * $, `, ", \, or <newline>. A double quote may be quoted |
6225 | * within double quotes by preceding it with a backslash." |
6226 | */ |
6227 | if (strchr("$`\"\\\n", next) != NULL) { |
6228 | ch = i_getch(input); |
6229 | if (ch != '\n') { |
6230 | o_addqchr(dest, ch); |
6231 | nommu_addchr(as_string, ch); |
6232 | } |
6233 | } else { |
6234 | o_addqchr(dest, '\\'); |
6235 | nommu_addchr(as_string, '\\'); |
6236 | } |
6237 | goto again; |
6238 | } |
6239 | if (ch == '$') { |
6240 | if (parse_dollar(as_string, dest, input) != 0) { |
6241 | debug_printf_parse("parse_stream_dquoted return 1: " |
6242 | "parse_dollar returned non-0\n"); |
6243 | return 1; |
6244 | } |
6245 | goto again; |
6246 | } |
6247 | #if ENABLE_HUSH_TICK |
6248 | if (ch == '`') { |
6249 | //unsigned pos = dest->length; |
6250 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6251 | o_addchr(dest, 0x80 | '`'); |
6252 | add_till_backquote(dest, input); |
6253 | o_addchr(dest, SPECIAL_VAR_SYMBOL); |
6254 | //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos); |
6255 | goto again; |
6256 | } |
6257 | #endif |
6258 | o_addQchr(dest, ch); |
6259 | if (ch == '=' |
6260 | && (dest->o_assignment == MAYBE_ASSIGNMENT |
6261 | || dest->o_assignment == WORD_IS_KEYWORD) |
6262 | && is_well_formed_var_name(dest->data, '=') |
6263 | ) { |
6264 | dest->o_assignment = DEFINITELY_ASSIGNMENT; |
6265 | } |
6266 | goto again; |
6267 | #undef as_string |
6268 | } |
6269 | |
6270 | /* |
6271 | * Scan input until EOF or end_trigger char. |
6272 | * Return a list of pipes to execute, or NULL on EOF |
6273 | * or if end_trigger character is met. |
6274 | * On syntax error, exit is shell is not interactive, |
6275 | * reset parsing machinery and start parsing anew, |
6276 | * or return ERR_PTR. |
6277 | */ |
6278 | static struct pipe *parse_stream(char **pstring, |
6279 | struct in_str *input, |
6280 | int end_trigger) |
6281 | { |
6282 | struct parse_context ctx; |
6283 | o_string dest = NULL_O_STRING; |
6284 | int is_in_dquote; |
6285 | int heredoc_cnt; |
6286 | |
6287 | /* Double-quote state is handled in the state variable is_in_dquote. |
6288 | * A single-quote triggers a bypass of the main loop until its mate is |
6289 | * found. When recursing, quote state is passed in via dest->o_escape. |
6290 | */ |
6291 | debug_printf_parse("parse_stream entered, end_trigger='%c'\n", |
6292 | end_trigger ? end_trigger : 'X'); |
6293 | debug_enter(); |
6294 | |
6295 | /* If very first arg is "" or '', dest.data may end up NULL. |
6296 | * Preventing this: */ |
6297 | o_addchr(&dest, '\0'); |
6298 | dest.length = 0; |
6299 | |
6300 | G.ifs = get_local_var_value("IFS"); |
6301 | if (G.ifs == NULL) |
6302 | G.ifs = defifs; |
6303 | |
6304 | reset: |
6305 | #if ENABLE_HUSH_INTERACTIVE |
6306 | input->promptmode = 0; /* PS1 */ |
6307 | #endif |
6308 | /* dest.o_assignment = MAYBE_ASSIGNMENT; - already is */ |
6309 | initialize_context(&ctx); |
6310 | is_in_dquote = 0; |
6311 | heredoc_cnt = 0; |
6312 | while (1) { |
6313 | const char *is_ifs; |
6314 | const char *is_special; |
6315 | int ch; |
6316 | int next; |
6317 | int redir_fd; |
6318 | redir_type redir_style; |
6319 | |
6320 | if (is_in_dquote) { |
6321 | /* dest.o_quoted = 1; - already is (see below) */ |
6322 | if (parse_stream_dquoted(&ctx.as_string, &dest, input, '"')) { |
6323 | goto parse_error; |
6324 | } |
6325 | /* We reached closing '"' */ |
6326 | is_in_dquote = 0; |
6327 | } |
6328 | ch = i_getch(input); |
6329 | debug_printf_parse(": ch=%c (%d) escape=%d\n", |
6330 | ch, ch, dest.o_escape); |
6331 | if (ch == EOF) { |
6332 | struct pipe *pi; |
6333 | |
6334 | if (heredoc_cnt) { |
6335 | syntax_error_unterm_str("here document"); |
6336 | goto parse_error; |
6337 | } |
6338 | /* end_trigger == '}' case errors out earlier, |
6339 | * checking only ')' */ |
6340 | if (end_trigger == ')') { |
6341 | syntax_error_unterm_ch('('); /* exits */ |
6342 | /* goto parse_error; */ |
6343 | } |
6344 | |
6345 | if (done_word(&dest, &ctx)) { |
6346 | goto parse_error; |
6347 | } |
6348 | o_free(&dest); |
6349 | done_pipe(&ctx, PIPE_SEQ); |
6350 | pi = ctx.list_head; |
6351 | /* If we got nothing... */ |
6352 | /* (this makes bare "&" cmd a no-op. |
6353 | * bash says: "syntax error near unexpected token '&'") */ |
6354 | if (pi->num_cmds == 0 |
6355 | IF_HAS_KEYWORDS( && pi->res_word == RES_NONE) |
6356 | ) { |
6357 | free_pipe_list(pi); |
6358 | pi = NULL; |
6359 | } |
6360 | #if !BB_MMU |
6361 | debug_printf_parse("as_string '%s'\n", ctx.as_string.data); |
6362 | if (pstring) |
6363 | *pstring = ctx.as_string.data; |
6364 | else |
6365 | o_free_unsafe(&ctx.as_string); |
6366 | #endif |
6367 | debug_leave(); |
6368 | debug_printf_parse("parse_stream return %p\n", pi); |
6369 | return pi; |
6370 | } |
6371 | nommu_addchr(&ctx.as_string, ch); |
6372 | |
6373 | next = '\0'; |
6374 | if (ch != '\n') |
6375 | next = i_peek(input); |
6376 | |
6377 | is_special = "{}<>;&|()#'" /* special outside of "str" */ |
6378 | "\\$\"" IF_HUSH_TICK("`"); /* always special */ |
6379 | /* Are { and } special here? */ |
6380 | if (ctx.command->argv /* word [word]{... - non-special */ |
6381 | || dest.length /* word{... - non-special */ |
6382 | || dest.o_quoted /* ""{... - non-special */ |
6383 | || (next != ';' /* }; - special */ |
6384 | && next != ')' /* }) - special */ |
6385 | && next != '&' /* }& and }&& ... - special */ |
6386 | && next != '|' /* }|| ... - special */ |
6387 | && !strchr(G.ifs, next) /* {word - non-special */ |
6388 | ) |
6389 | ) { |
6390 | /* They are not special, skip "{}" */ |
6391 | is_special += 2; |
6392 | } |
6393 | is_special = strchr(is_special, ch); |
6394 | is_ifs = strchr(G.ifs, ch); |
6395 | |
6396 | if (!is_special && !is_ifs) { /* ordinary char */ |
6397 | ordinary_char: |
6398 | o_addQchr(&dest, ch); |
6399 | if ((dest.o_assignment == MAYBE_ASSIGNMENT |
6400 | || dest.o_assignment == WORD_IS_KEYWORD) |
6401 | && ch == '=' |
6402 | && is_well_formed_var_name(dest.data, '=') |
6403 | ) { |
6404 | dest.o_assignment = DEFINITELY_ASSIGNMENT; |
6405 | } |
6406 | continue; |
6407 | } |
6408 | |
6409 | if (is_ifs) { |
6410 | if (done_word(&dest, &ctx)) { |
6411 | goto parse_error; |
6412 | } |
6413 | if (ch == '\n') { |
6414 | #if ENABLE_HUSH_CASE |
6415 | /* "case ... in <newline> word) ..." - |
6416 | * newlines are ignored (but ';' wouldn't be) */ |
6417 | if (ctx.command->argv == NULL |
6418 | && ctx.ctx_res_w == RES_MATCH |
6419 | ) { |
6420 | continue; |
6421 | } |
6422 | #endif |
6423 | /* Treat newline as a command separator. */ |
6424 | done_pipe(&ctx, PIPE_SEQ); |
6425 | debug_printf_parse("heredoc_cnt:%d\n", heredoc_cnt); |
6426 | if (heredoc_cnt) { |
6427 | if (fetch_heredocs(heredoc_cnt, &ctx, input)) { |
6428 | goto parse_error; |
6429 | } |
6430 | heredoc_cnt = 0; |
6431 | } |
6432 | dest.o_assignment = MAYBE_ASSIGNMENT; |
6433 | ch = ';'; |
6434 | /* note: if (is_ifs) continue; |
6435 | * will still trigger for us */ |
6436 | } |
6437 | } |
6438 | |
6439 | /* "cmd}" or "cmd }..." without semicolon or &: |
6440 | * } is an ordinary char in this case, even inside { cmd; } |
6441 | * Pathological example: { ""}; } should exec "}" cmd |
6442 | */ |
6443 | if (ch == '}') { |
6444 | if (!IS_NULL_CMD(ctx.command) /* cmd } */ |
6445 | || dest.length != 0 /* word} */ |
6446 | || dest.o_quoted /* ""} */ |
6447 | ) { |
6448 | goto ordinary_char; |
6449 | } |
6450 | if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */ |
6451 | goto skip_end_trigger; |
6452 | /* else: } does terminate a group */ |
6453 | } |
6454 | |
6455 | if (end_trigger && end_trigger == ch |
6456 | && (ch != ';' || heredoc_cnt == 0) |
6457 | #if ENABLE_HUSH_CASE |
6458 | && (ch != ')' |
6459 | || ctx.ctx_res_w != RES_MATCH |
6460 | || (!dest.o_quoted && strcmp(dest.data, "esac") == 0) |
6461 | ) |
6462 | #endif |
6463 | ) { |
6464 | if (heredoc_cnt) { |
6465 | /* This is technically valid: |
6466 | * { cat <<HERE; }; echo Ok |
6467 | * heredoc |
6468 | * heredoc |
6469 | * HERE |
6470 | * but we don't support this. |
6471 | * We require heredoc to be in enclosing {}/(), |
6472 | * if any. |
6473 | */ |
6474 | syntax_error_unterm_str("here document"); |
6475 | goto parse_error; |
6476 | } |
6477 | if (done_word(&dest, &ctx)) { |
6478 | goto parse_error; |
6479 | } |
6480 | done_pipe(&ctx, PIPE_SEQ); |
6481 | dest.o_assignment = MAYBE_ASSIGNMENT; |
6482 | /* Do we sit outside of any if's, loops or case's? */ |
6483 | if (!HAS_KEYWORDS |
6484 | IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0)) |
6485 | ) { |
6486 | o_free(&dest); |
6487 | #if !BB_MMU |
6488 | debug_printf_parse("as_string '%s'\n", ctx.as_string.data); |
6489 | if (pstring) |
6490 | *pstring = ctx.as_string.data; |
6491 | else |
6492 | o_free_unsafe(&ctx.as_string); |
6493 | #endif |
6494 | debug_leave(); |
6495 | debug_printf_parse("parse_stream return %p: " |
6496 | "end_trigger char found\n", |
6497 | ctx.list_head); |
6498 | return ctx.list_head; |
6499 | } |
6500 | } |
6501 | skip_end_trigger: |
6502 | if (is_ifs) |
6503 | continue; |
6504 | |
6505 | /* Catch <, > before deciding whether this word is |
6506 | * an assignment. a=1 2>z b=2: b=2 is still assignment */ |
6507 | switch (ch) { |
6508 | case '>': |
6509 | redir_fd = redirect_opt_num(&dest); |
6510 | if (done_word(&dest, &ctx)) { |
6511 | goto parse_error; |
6512 | } |
6513 | redir_style = REDIRECT_OVERWRITE; |
6514 | if (next == '>') { |
6515 | redir_style = REDIRECT_APPEND; |
6516 | ch = i_getch(input); |
6517 | nommu_addchr(&ctx.as_string, ch); |
6518 | } |
6519 | #if 0 |
6520 | else if (next == '(') { |
6521 | syntax_error(">(process) not supported"); |
6522 | goto parse_error; |
6523 | } |
6524 | #endif |
6525 | if (parse_redirect(&ctx, redir_fd, redir_style, input)) |
6526 | goto parse_error; |
6527 | continue; /* back to top of while (1) */ |
6528 | case '<': |
6529 | redir_fd = redirect_opt_num(&dest); |
6530 | if (done_word(&dest, &ctx)) { |
6531 | goto parse_error; |
6532 | } |
6533 | redir_style = REDIRECT_INPUT; |
6534 | if (next == '<') { |
6535 | redir_style = REDIRECT_HEREDOC; |
6536 | heredoc_cnt++; |
6537 | debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt); |
6538 | ch = i_getch(input); |
6539 | nommu_addchr(&ctx.as_string, ch); |
6540 | } else if (next == '>') { |
6541 | redir_style = REDIRECT_IO; |
6542 | ch = i_getch(input); |
6543 | nommu_addchr(&ctx.as_string, ch); |
6544 | } |
6545 | #if 0 |
6546 | else if (next == '(') { |
6547 | syntax_error("<(process) not supported"); |
6548 | goto parse_error; |
6549 | } |
6550 | #endif |
6551 | if (parse_redirect(&ctx, redir_fd, redir_style, input)) |
6552 | goto parse_error; |
6553 | continue; /* back to top of while (1) */ |
6554 | } |
6555 | |
6556 | if (dest.o_assignment == MAYBE_ASSIGNMENT |
6557 | /* check that we are not in word in "a=1 2>word b=1": */ |
6558 | && !ctx.pending_redirect |
6559 | ) { |
6560 | /* ch is a special char and thus this word |
6561 | * cannot be an assignment */ |
6562 | dest.o_assignment = NOT_ASSIGNMENT; |
6563 | } |
6564 | |
6565 | /* Note: nommu_addchr(&ctx.as_string, ch) is already done */ |
6566 | |
6567 | switch (ch) { |
6568 | case '#': |
6569 | if (dest.length == 0) { |
6570 | while (1) { |
6571 | ch = i_peek(input); |
6572 | if (ch == EOF || ch == '\n') |
6573 | break; |
6574 | i_getch(input); |
6575 | /* note: we do not add it to &ctx.as_string */ |
6576 | } |
6577 | nommu_addchr(&ctx.as_string, '\n'); |
6578 | } else { |
6579 | o_addQchr(&dest, ch); |
6580 | } |
6581 | break; |
6582 | case '\\': |
6583 | if (next == EOF) { |
6584 | syntax_error("\\<eof>"); |
6585 | xfunc_die(); |
6586 | } |
6587 | ch = i_getch(input); |
6588 | if (ch != '\n') { |
6589 | o_addchr(&dest, '\\'); |
6590 | /*nommu_addchr(&ctx.as_string, '\\'); - already done */ |
6591 | o_addchr(&dest, ch); |
6592 | nommu_addchr(&ctx.as_string, ch); |
6593 | /* Example: echo Hello \2>file |
6594 | * we need to know that word 2 is quoted */ |
6595 | dest.o_quoted = 1; |
6596 | } |
6597 | #if !BB_MMU |
6598 | else { |
6599 | /* It's "\<newline>". Remove trailing '\' from ctx.as_string */ |
6600 | ctx.as_string.data[--ctx.as_string.length] = '\0'; |
6601 | } |
6602 | #endif |
6603 | break; |
6604 | case '$': |
6605 | if (parse_dollar(&ctx.as_string, &dest, input) != 0) { |
6606 | debug_printf_parse("parse_stream parse error: " |
6607 | "parse_dollar returned non-0\n"); |
6608 | goto parse_error; |
6609 | } |
6610 | break; |
6611 | case '\'': |
6612 | dest.o_quoted = 1; |
6613 | while (1) { |
6614 | ch = i_getch(input); |
6615 | if (ch == EOF) { |
6616 | syntax_error_unterm_ch('\''); |
6617 | /*xfunc_die(); - redundant */ |
6618 | } |
6619 | nommu_addchr(&ctx.as_string, ch); |
6620 | if (ch == '\'') |
6621 | break; |
6622 | o_addqchr(&dest, ch); |
6623 | } |
6624 | break; |
6625 | case '"': |
6626 | dest.o_quoted = 1; |
6627 | is_in_dquote ^= 1; /* invert */ |
6628 | if (dest.o_assignment == NOT_ASSIGNMENT) |
6629 | dest.o_escape ^= 1; |
6630 | break; |
6631 | #if ENABLE_HUSH_TICK |
6632 | case '`': { |
6633 | unsigned pos; |
6634 | |
6635 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
6636 | o_addchr(&dest, '`'); |
6637 | pos = dest.length; |
6638 | add_till_backquote(&dest, input); |
6639 | # if !BB_MMU |
6640 | o_addstr(&ctx.as_string, dest.data + pos); |
6641 | o_addchr(&ctx.as_string, '`'); |
6642 | # endif |
6643 | o_addchr(&dest, SPECIAL_VAR_SYMBOL); |
6644 | //debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos); |
6645 | break; |
6646 | } |
6647 | #endif |
6648 | case ';': |
6649 | #if ENABLE_HUSH_CASE |
6650 | case_semi: |
6651 | #endif |
6652 | if (done_word(&dest, &ctx)) { |
6653 | goto parse_error; |
6654 | } |
6655 | done_pipe(&ctx, PIPE_SEQ); |
6656 | #if ENABLE_HUSH_CASE |
6657 | /* Eat multiple semicolons, detect |
6658 | * whether it means something special */ |
6659 | while (1) { |
6660 | ch = i_peek(input); |
6661 | if (ch != ';') |
6662 | break; |
6663 | ch = i_getch(input); |
6664 | nommu_addchr(&ctx.as_string, ch); |
6665 | if (ctx.ctx_res_w == RES_CASE_BODY) { |
6666 | ctx.ctx_dsemicolon = 1; |
6667 | ctx.ctx_res_w = RES_MATCH; |
6668 | break; |
6669 | } |
6670 | } |
6671 | #endif |
6672 | new_cmd: |
6673 | /* We just finished a cmd. New one may start |
6674 | * with an assignment */ |
6675 | dest.o_assignment = MAYBE_ASSIGNMENT; |
6676 | break; |
6677 | case '&': |
6678 | if (done_word(&dest, &ctx)) { |
6679 | goto parse_error; |
6680 | } |
6681 | if (next == '&') { |
6682 | ch = i_getch(input); |
6683 | nommu_addchr(&ctx.as_string, ch); |
6684 | done_pipe(&ctx, PIPE_AND); |
6685 | } else { |
6686 | done_pipe(&ctx, PIPE_BG); |
6687 | } |
6688 | goto new_cmd; |
6689 | case '|': |
6690 | if (done_word(&dest, &ctx)) { |
6691 | goto parse_error; |
6692 | } |
6693 | #if ENABLE_HUSH_CASE |
6694 | if (ctx.ctx_res_w == RES_MATCH) |
6695 | break; /* we are in case's "word | word)" */ |
6696 | #endif |
6697 | if (next == '|') { /* || */ |
6698 | ch = i_getch(input); |
6699 | nommu_addchr(&ctx.as_string, ch); |
6700 | done_pipe(&ctx, PIPE_OR); |
6701 | } else { |
6702 | /* we could pick up a file descriptor choice here |
6703 | * with redirect_opt_num(), but bash doesn't do it. |
6704 | * "echo foo 2| cat" yields "foo 2". */ |
6705 | done_command(&ctx); |
6706 | #if !BB_MMU |
6707 | o_reset_to_empty_unquoted(&ctx.as_string); |
6708 | #endif |
6709 | } |
6710 | goto new_cmd; |
6711 | case '(': |
6712 | #if ENABLE_HUSH_CASE |
6713 | /* "case... in [(]word)..." - skip '(' */ |
6714 | if (ctx.ctx_res_w == RES_MATCH |
6715 | && ctx.command->argv == NULL /* not (word|(... */ |
6716 | && dest.length == 0 /* not word(... */ |
6717 | && dest.o_quoted == 0 /* not ""(... */ |
6718 | ) { |
6719 | continue; |
6720 | } |
6721 | #endif |
6722 | case '{': |
6723 | if (parse_group(&dest, &ctx, input, ch) != 0) { |
6724 | goto parse_error; |
6725 | } |
6726 | goto new_cmd; |
6727 | case ')': |
6728 | #if ENABLE_HUSH_CASE |
6729 | if (ctx.ctx_res_w == RES_MATCH) |
6730 | goto case_semi; |
6731 | #endif |
6732 | case '}': |
6733 | /* proper use of this character is caught by end_trigger: |
6734 | * if we see {, we call parse_group(..., end_trigger='}') |
6735 | * and it will match } earlier (not here). */ |
6736 | syntax_error_unexpected_ch(ch); |
6737 | goto parse_error; |
6738 | default: |
6739 | if (HUSH_DEBUG) |
6740 | bb_error_msg_and_die("BUG: unexpected %c\n", ch); |
6741 | } |
6742 | } /* while (1) */ |
6743 | |
6744 | parse_error: |
6745 | { |
6746 | struct parse_context *pctx; |
6747 | IF_HAS_KEYWORDS(struct parse_context *p2;) |
6748 | |
6749 | /* Clean up allocated tree. |
6750 | * Sample for finding leaks on syntax error recovery path. |
6751 | * Run it from interactive shell, watch pmap `pidof hush`. |
6752 | * while if false; then false; fi; do break; fi |
6753 | * Samples to catch leaks at execution: |
6754 | * while if (true | {true;}); then echo ok; fi; do break; done |
6755 | * while if (true | {true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done |
6756 | */ |
6757 | pctx = &ctx; |
6758 | do { |
6759 | /* Update pipe/command counts, |
6760 | * otherwise freeing may miss some */ |
6761 | done_pipe(pctx, PIPE_SEQ); |
6762 | debug_printf_clean("freeing list %p from ctx %p\n", |
6763 | pctx->list_head, pctx); |
6764 | debug_print_tree(pctx->list_head, 0); |
6765 | free_pipe_list(pctx->list_head); |
6766 | debug_printf_clean("freed list %p\n", pctx->list_head); |
6767 | #if !BB_MMU |
6768 | o_free_unsafe(&pctx->as_string); |
6769 | #endif |
6770 | IF_HAS_KEYWORDS(p2 = pctx->stack;) |
6771 | if (pctx != &ctx) { |
6772 | free(pctx); |
6773 | } |
6774 | IF_HAS_KEYWORDS(pctx = p2;) |
6775 | } while (HAS_KEYWORDS && pctx); |
6776 | /* Free text, clear all dest fields */ |
6777 | o_free(&dest); |
6778 | /* If we are not in top-level parse, we return, |
6779 | * our caller will propagate error. |
6780 | */ |
6781 | if (end_trigger != ';') { |
6782 | #if !BB_MMU |
6783 | if (pstring) |
6784 | *pstring = NULL; |
6785 | #endif |
6786 | debug_leave(); |
6787 | return ERR_PTR; |
6788 | } |
6789 | /* Discard cached input, force prompt */ |
6790 | input->p = NULL; |
6791 | IF_HUSH_INTERACTIVE(input->promptme = 1;) |
6792 | goto reset; |
6793 | } |
6794 | } |
6795 | |
6796 | /* Executing from string: eval, sh -c '...' |
6797 | * or from file: /etc/profile, . file, sh <script>, sh (intereactive) |
6798 | * end_trigger controls how often we stop parsing |
6799 | * NUL: parse all, execute, return |
6800 | * ';': parse till ';' or newline, execute, repeat till EOF |
6801 | */ |
6802 | static void parse_and_run_stream(struct in_str *inp, int end_trigger) |
6803 | { |
6804 | /* Why we need empty flag? |
6805 | * An obscure corner case "false; ``; echo $?": |
6806 | * empty command in `` should still set $? to 0. |
6807 | * But we can't just set $? to 0 at the start, |
6808 | * this breaks "false; echo `echo $?`" case. |
6809 | */ |
6810 | bool empty = 1; |
6811 | while (1) { |
6812 | struct pipe *pipe_list; |
6813 | |
6814 | pipe_list = parse_stream(NULL, inp, end_trigger); |
6815 | if (!pipe_list) { /* EOF */ |
6816 | if (empty) |
6817 | G.last_exitcode = 0; |
6818 | break; |
6819 | } |
6820 | debug_print_tree(pipe_list, 0); |
6821 | debug_printf_exec("parse_and_run_stream: run_and_free_list\n"); |
6822 | run_and_free_list(pipe_list); |
6823 | empty = 0; |
6824 | } |
6825 | } |
6826 | |
6827 | static void parse_and_run_string(const char *s) |
6828 | { |
6829 | struct in_str input; |
6830 | setup_string_in_str(&input, s); |
6831 | parse_and_run_stream(&input, '\0'); |
6832 | } |
6833 | |
6834 | static void parse_and_run_file(FILE *f) |
6835 | { |
6836 | struct in_str input; |
6837 | setup_file_in_str(&input, f); |
6838 | parse_and_run_stream(&input, ';'); |
6839 | } |
6840 | |
6841 | /* Called a few times only (or even once if "sh -c") */ |
6842 | static void init_sigmasks(void) |
6843 | { |
6844 | unsigned sig; |
6845 | unsigned mask; |
6846 | sigset_t old_blocked_set; |
6847 | |
6848 | if (!G.inherited_set_is_saved) { |
6849 | sigprocmask(SIG_SETMASK, NULL, &G.blocked_set); |
6850 | G.inherited_set = G.blocked_set; |
6851 | } |
6852 | old_blocked_set = G.blocked_set; |
6853 | |
6854 | mask = (1 << SIGQUIT); |
6855 | if (G_interactive_fd) { |
6856 | mask = (1 << SIGQUIT) | SPECIAL_INTERACTIVE_SIGS; |
6857 | if (G_saved_tty_pgrp) /* we have ctty, job control sigs work */ |
6858 | mask |= SPECIAL_JOB_SIGS; |
6859 | } |
6860 | G.non_DFL_mask = mask; |
6861 | |
6862 | sig = 0; |
6863 | while (mask) { |
6864 | if (mask & 1) |
6865 | sigaddset(&G.blocked_set, sig); |
6866 | mask >>= 1; |
6867 | sig++; |
6868 | } |
6869 | sigdelset(&G.blocked_set, SIGCHLD); |
6870 | |
6871 | if (memcmp(&old_blocked_set, &G.blocked_set, sizeof(old_blocked_set)) != 0) |
6872 | sigprocmask(SIG_SETMASK, &G.blocked_set, NULL); |
6873 | |
6874 | /* POSIX allows shell to re-enable SIGCHLD |
6875 | * even if it was SIG_IGN on entry */ |
6876 | #if ENABLE_HUSH_FAST |
6877 | G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */ |
6878 | if (!G.inherited_set_is_saved) |
6879 | signal(SIGCHLD, SIGCHLD_handler); |
6880 | #else |
6881 | if (!G.inherited_set_is_saved) |
6882 | signal(SIGCHLD, SIG_DFL); |
6883 | #endif |
6884 | |
6885 | G.inherited_set_is_saved = 1; |
6886 | } |
6887 | |
6888 | #if ENABLE_HUSH_JOB |
6889 | /* helper */ |
6890 | static void maybe_set_to_sigexit(int sig) |
6891 | { |
6892 | void (*handler)(int); |
6893 | /* non_DFL_mask'ed signals are, well, masked, |
6894 | * no need to set handler for them. |
6895 | */ |
6896 | if (!((G.non_DFL_mask >> sig) & 1)) { |
6897 | handler = signal(sig, sigexit); |
6898 | if (handler == SIG_IGN) /* oops... restore back to IGN! */ |
6899 | signal(sig, handler); |
6900 | } |
6901 | } |
6902 | /* Set handlers to restore tty pgrp and exit */ |
6903 | static void set_fatal_handlers(void) |
6904 | { |
6905 | /* We _must_ restore tty pgrp on fatal signals */ |
6906 | if (HUSH_DEBUG) { |
6907 | maybe_set_to_sigexit(SIGILL ); |
6908 | maybe_set_to_sigexit(SIGFPE ); |
6909 | maybe_set_to_sigexit(SIGBUS ); |
6910 | maybe_set_to_sigexit(SIGSEGV); |
6911 | maybe_set_to_sigexit(SIGTRAP); |
6912 | } /* else: hush is perfect. what SEGV? */ |
6913 | maybe_set_to_sigexit(SIGABRT); |
6914 | /* bash 3.2 seems to handle these just like 'fatal' ones */ |
6915 | maybe_set_to_sigexit(SIGPIPE); |
6916 | maybe_set_to_sigexit(SIGALRM); |
6917 | /* if we are interactive, SIGHUP, SIGTERM and SIGINT are masked. |
6918 | * if we aren't interactive... but in this case |
6919 | * we never want to restore pgrp on exit, and this fn is not called */ |
6920 | /*maybe_set_to_sigexit(SIGHUP );*/ |
6921 | /*maybe_set_to_sigexit(SIGTERM);*/ |
6922 | /*maybe_set_to_sigexit(SIGINT );*/ |
6923 | } |
6924 | #endif |
6925 | |
6926 | static int set_mode(const char cstate, const char mode) |
6927 | { |
6928 | int state = (cstate == '-' ? 1 : 0); |
6929 | switch (mode) { |
6930 | case 'n': G.fake_mode = state; break; |
6931 | case 'x': /*G.debug_mode = state;*/ break; |
6932 | default: return EXIT_FAILURE; |
6933 | } |
6934 | return EXIT_SUCCESS; |
6935 | } |
6936 | |
6937 | int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
6938 | int hush_main(int argc, char **argv) |
6939 | { |
6940 | static const struct variable const_shell_ver = { |
6941 | .next = NULL, |
6942 | .varstr = (char*)hush_version_str, |
6943 | .max_len = 1, /* 0 can provoke free(name) */ |
6944 | .flg_export = 1, |
6945 | .flg_read_only = 1, |
6946 | }; |
6947 | int opt; |
6948 | unsigned builtin_argc; |
6949 | char **e; |
6950 | struct variable *cur_var; |
6951 | |
6952 | INIT_G(); |
6953 | if (EXIT_SUCCESS) /* if EXIT_SUCCESS == 0, it is already done */ |
6954 | G.last_exitcode = EXIT_SUCCESS; |
6955 | #if !BB_MMU |
6956 | G.argv0_for_re_execing = argv[0]; |
6957 | #endif |
6958 | /* Deal with HUSH_VERSION */ |
6959 | G.shell_ver = const_shell_ver; /* copying struct here */ |
6960 | G.top_var = &G.shell_ver; |
6961 | debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION"); |
6962 | unsetenv("HUSH_VERSION"); /* in case it exists in initial env */ |
6963 | /* Initialize our shell local variables with the values |
6964 | * currently living in the environment */ |
6965 | cur_var = G.top_var; |
6966 | e = environ; |
6967 | if (e) while (*e) { |
6968 | char *value = strchr(*e, '='); |
6969 | if (value) { /* paranoia */ |
6970 | cur_var->next = xzalloc(sizeof(*cur_var)); |
6971 | cur_var = cur_var->next; |
6972 | cur_var->varstr = *e; |
6973 | cur_var->max_len = strlen(*e); |
6974 | cur_var->flg_export = 1; |
6975 | } |
6976 | e++; |
6977 | } |
6978 | /* reinstate HUSH_VERSION */ |
6979 | debug_printf_env("putenv '%s'\n", hush_version_str); |
6980 | putenv((char *)hush_version_str); |
6981 | |
6982 | /* Export PWD */ |
6983 | set_pwd_var(/*exp:*/ 1); |
6984 | /* bash also exports SHLVL and _, |
6985 | * and sets (but doesn't export) the following variables: |
6986 | * BASH=/bin/bash |
6987 | * BASH_VERSINFO=([0]="3" [1]="2" [2]="0" [3]="1" [4]="release" [5]="i386-pc-linux-gnu") |
6988 | * BASH_VERSION='3.2.0(1)-release' |
6989 | * HOSTTYPE=i386 |
6990 | * MACHTYPE=i386-pc-linux-gnu |
6991 | * OSTYPE=linux-gnu |
6992 | * HOSTNAME=<xxxxxxxxxx> |
6993 | * PPID=<NNNNN> - we also do it elsewhere |
6994 | * EUID=<NNNNN> |
6995 | * UID=<NNNNN> |
6996 | * GROUPS=() |
6997 | * LINES=<NNN> |
6998 | * COLUMNS=<NNN> |
6999 | * BASH_ARGC=() |
7000 | * BASH_ARGV=() |
7001 | * BASH_LINENO=() |
7002 | * BASH_SOURCE=() |
7003 | * DIRSTACK=() |
7004 | * PIPESTATUS=([0]="0") |
7005 | * HISTFILE=/<xxx>/.bash_history |
7006 | * HISTFILESIZE=500 |
7007 | * HISTSIZE=500 |
7008 | * MAILCHECK=60 |
7009 | * PATH=/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:. |
7010 | * SHELL=/bin/bash |
7011 | * SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor |
7012 | * TERM=dumb |
7013 | * OPTERR=1 |
7014 | * OPTIND=1 |
7015 | * IFS=$' \t\n' |
7016 | * PS1='\s-\v\$ ' |
7017 | * PS2='> ' |
7018 | * PS4='+ ' |
7019 | */ |
7020 | |
7021 | #if ENABLE_FEATURE_EDITING |
7022 | G.line_input_state = new_line_input_t(FOR_SHELL); |
7023 | #endif |
7024 | G.global_argc = argc; |
7025 | G.global_argv = argv; |
7026 | /* Initialize some more globals to non-zero values */ |
7027 | cmdedit_update_prompt(); |
7028 | |
7029 | if (setjmp(die_jmp)) { |
7030 | /* xfunc has failed! die die die */ |
7031 | /* no EXIT traps, this is an escape hatch! */ |
7032 | G.exiting = 1; |
7033 | hush_exit(xfunc_error_retval); |
7034 | } |
7035 | |
7036 | /* Shell is non-interactive at first. We need to call |
7037 | * init_sigmasks() if we are going to execute "sh <script>", |
7038 | * "sh -c <cmds>" or login shell's /etc/profile and friends. |
7039 | * If we later decide that we are interactive, we run init_sigmasks() |
7040 | * in order to intercept (more) signals. |
7041 | */ |
7042 | |
7043 | /* Parse options */ |
7044 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */ |
7045 | builtin_argc = 0; |
7046 | while (1) { |
7047 | opt = getopt(argc, argv, "+c:xins" |
7048 | #if !BB_MMU |
7049 | "<:$:R:V:" |
7050 | # if ENABLE_HUSH_FUNCTIONS |
7051 | "F:" |
7052 | # endif |
7053 | #endif |
7054 | ); |
7055 | if (opt <= 0) |
7056 | break; |
7057 | switch (opt) { |
7058 | case 'c': |
7059 | /* Possibilities: |
7060 | * sh ... -c 'script' |
7061 | * sh ... -c 'script' ARG0 [ARG1...] |
7062 | * On NOMMU, if builtin_argc != 0, |
7063 | * sh ... -c 'builtin' BARGV... "" ARG0 [ARG1...] |
7064 | * "" needs to be replaced with NULL |
7065 | * and BARGV vector fed to builtin function. |
7066 | * Note: the form without ARG0 never happens: |
7067 | * sh ... -c 'builtin' BARGV... "" |
7068 | */ |
7069 | if (!G.root_pid) { |
7070 | G.root_pid = getpid(); |
7071 | G.root_ppid = getppid(); |
7072 | } |
7073 | G.global_argv = argv + optind; |
7074 | G.global_argc = argc - optind; |
7075 | if (builtin_argc) { |
7076 | /* -c 'builtin' [BARGV...] "" ARG0 [ARG1...] */ |
7077 | const struct built_in_command *x; |
7078 | |
7079 | init_sigmasks(); |
7080 | x = find_builtin(optarg); |
7081 | if (x) { /* paranoia */ |
7082 | G.global_argc -= builtin_argc; /* skip [BARGV...] "" */ |
7083 | G.global_argv += builtin_argc; |
7084 | G.global_argv[-1] = NULL; /* replace "" */ |
7085 | G.last_exitcode = x->b_function(argv + optind - 1); |
7086 | } |
7087 | goto final_return; |
7088 | } |
7089 | if (!G.global_argv[0]) { |
7090 | /* -c 'script' (no params): prevent empty $0 */ |
7091 | G.global_argv--; /* points to argv[i] of 'script' */ |
7092 | G.global_argv[0] = argv[0]; |
7093 | G.global_argc++; |
7094 | } /* else -c 'script' ARG0 [ARG1...]: $0 is ARG0 */ |
7095 | init_sigmasks(); |
7096 | parse_and_run_string(optarg); |
7097 | goto final_return; |
7098 | case 'i': |
7099 | /* Well, we cannot just declare interactiveness, |
7100 | * we have to have some stuff (ctty, etc) */ |
7101 | /* G_interactive_fd++; */ |
7102 | break; |
7103 | case 's': |
7104 | /* "-s" means "read from stdin", but this is how we always |
7105 | * operate, so simply do nothing here. */ |
7106 | break; |
7107 | #if !BB_MMU |
7108 | case '<': /* "big heredoc" support */ |
7109 | full_write1_str(optarg); |
7110 | _exit(0); |
7111 | case '$': { |
7112 | unsigned long long empty_trap_mask; |
7113 | |
7114 | G.root_pid = bb_strtou(optarg, &optarg, 16); |
7115 | optarg++; |
7116 | G.root_ppid = bb_strtou(optarg, &optarg, 16); |
7117 | optarg++; |
7118 | G.last_bg_pid = bb_strtou(optarg, &optarg, 16); |
7119 | optarg++; |
7120 | G.last_exitcode = bb_strtou(optarg, &optarg, 16); |
7121 | optarg++; |
7122 | builtin_argc = bb_strtou(optarg, &optarg, 16); |
7123 | optarg++; |
7124 | empty_trap_mask = bb_strtoull(optarg, &optarg, 16); |
7125 | if (empty_trap_mask != 0) { |
7126 | int sig; |
7127 | init_sigmasks(); |
7128 | G.traps = xzalloc(sizeof(G.traps[0]) * NSIG); |
7129 | for (sig = 1; sig < NSIG; sig++) { |
7130 | if (empty_trap_mask & (1LL << sig)) { |
7131 | G.traps[sig] = xzalloc(1); /* == xstrdup(""); */ |
7132 | sigaddset(&G.blocked_set, sig); |
7133 | } |
7134 | } |
7135 | sigprocmask(SIG_SETMASK, &G.blocked_set, NULL); |
7136 | } |
7137 | # if ENABLE_HUSH_LOOPS |
7138 | optarg++; |
7139 | G.depth_of_loop = bb_strtou(optarg, &optarg, 16); |
7140 | # endif |
7141 | break; |
7142 | } |
7143 | case 'R': |
7144 | case 'V': |
7145 | set_local_var(xstrdup(optarg), /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ opt == 'R'); |
7146 | break; |
7147 | # if ENABLE_HUSH_FUNCTIONS |
7148 | case 'F': { |
7149 | struct function *funcp = new_function(optarg); |
7150 | /* funcp->name is already set to optarg */ |
7151 | /* funcp->body is set to NULL. It's a special case. */ |
7152 | funcp->body_as_string = argv[optind]; |
7153 | optind++; |
7154 | break; |
7155 | } |
7156 | # endif |
7157 | #endif |
7158 | case 'n': |
7159 | case 'x': |
7160 | if (!set_mode('-', opt)) |
7161 | break; |
7162 | default: |
7163 | #ifndef BB_VER |
7164 | fprintf(stderr, "Usage: sh [FILE]...\n" |
7165 | " or: sh -c command [args]...\n\n"); |
7166 | exit(EXIT_FAILURE); |
7167 | #else |
7168 | bb_show_usage(); |
7169 | #endif |
7170 | } |
7171 | } /* option parsing loop */ |
7172 | |
7173 | if (!G.root_pid) { |
7174 | G.root_pid = getpid(); |
7175 | G.root_ppid = getppid(); |
7176 | } |
7177 | |
7178 | /* If we are login shell... */ |
7179 | if (argv[0] && argv[0][0] == '-') { |
7180 | FILE *input; |
7181 | debug_printf("sourcing /etc/profile\n"); |
7182 | input = fopen_for_read("/etc/profile"); |
7183 | if (input != NULL) { |
7184 | close_on_exec_on(fileno(input)); |
7185 | init_sigmasks(); |
7186 | parse_and_run_file(input); |
7187 | fclose(input); |
7188 | } |
7189 | /* bash: after sourcing /etc/profile, |
7190 | * tries to source (in the given order): |
7191 | * ~/.bash_profile, ~/.bash_login, ~/.profile, |
7192 | * stopping on first found. --noprofile turns this off. |
7193 | * bash also sources ~/.bash_logout on exit. |
7194 | * If called as sh, skips .bash_XXX files. |
7195 | */ |
7196 | } |
7197 | |
7198 | if (argv[optind]) { |
7199 | FILE *input; |
7200 | /* |
7201 | * "bash <script>" (which is never interactive (unless -i?)) |
7202 | * sources $BASH_ENV here (without scanning $PATH). |
7203 | * If called as sh, does the same but with $ENV. |
7204 | */ |
7205 | debug_printf("running script '%s'\n", argv[optind]); |
7206 | G.global_argv = argv + optind; |
7207 | G.global_argc = argc - optind; |
7208 | input = xfopen_for_read(argv[optind]); |
7209 | close_on_exec_on(fileno(input)); |
7210 | init_sigmasks(); |
7211 | parse_and_run_file(input); |
7212 | #if ENABLE_FEATURE_CLEAN_UP |
7213 | fclose(input); |
7214 | #endif |
7215 | goto final_return; |
7216 | } |
7217 | |
7218 | /* Up to here, shell was non-interactive. Now it may become one. |
7219 | * NB: don't forget to (re)run init_sigmasks() as needed. |
7220 | */ |
7221 | |
7222 | /* A shell is interactive if the '-i' flag was given, |
7223 | * or if all of the following conditions are met: |
7224 | * no -c command |
7225 | * no arguments remaining or the -s flag given |
7226 | * standard input is a terminal |
7227 | * standard output is a terminal |
7228 | * Refer to Posix.2, the description of the 'sh' utility. |
7229 | */ |
7230 | #if ENABLE_HUSH_JOB |
7231 | if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) { |
7232 | G_saved_tty_pgrp = tcgetpgrp(STDIN_FILENO); |
7233 | debug_printf("saved_tty_pgrp:%d\n", G_saved_tty_pgrp); |
7234 | if (G_saved_tty_pgrp < 0) |
7235 | G_saved_tty_pgrp = 0; |
7236 | |
7237 | /* try to dup stdin to high fd#, >= 255 */ |
7238 | G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255); |
7239 | if (G_interactive_fd < 0) { |
7240 | /* try to dup to any fd */ |
7241 | G_interactive_fd = dup(STDIN_FILENO); |
7242 | if (G_interactive_fd < 0) { |
7243 | /* give up */ |
7244 | G_interactive_fd = 0; |
7245 | G_saved_tty_pgrp = 0; |
7246 | } |
7247 | } |
7248 | // TODO: track & disallow any attempts of user |
7249 | // to (inadvertently) close/redirect G_interactive_fd |
7250 | } |
7251 | debug_printf("interactive_fd:%d\n", G_interactive_fd); |
7252 | if (G_interactive_fd) { |
7253 | close_on_exec_on(G_interactive_fd); |
7254 | |
7255 | if (G_saved_tty_pgrp) { |
7256 | /* If we were run as 'hush &', sleep until we are |
7257 | * in the foreground (tty pgrp == our pgrp). |
7258 | * If we get started under a job aware app (like bash), |
7259 | * make sure we are now in charge so we don't fight over |
7260 | * who gets the foreground */ |
7261 | while (1) { |
7262 | pid_t shell_pgrp = getpgrp(); |
7263 | G_saved_tty_pgrp = tcgetpgrp(G_interactive_fd); |
7264 | if (G_saved_tty_pgrp == shell_pgrp) |
7265 | break; |
7266 | /* send TTIN to ourself (should stop us) */ |
7267 | kill(- shell_pgrp, SIGTTIN); |
7268 | } |
7269 | } |
7270 | |
7271 | /* Block some signals */ |
7272 | init_sigmasks(); |
7273 | |
7274 | if (G_saved_tty_pgrp) { |
7275 | /* Set other signals to restore saved_tty_pgrp */ |
7276 | set_fatal_handlers(); |
7277 | /* Put ourselves in our own process group |
7278 | * (bash, too, does this only if ctty is available) */ |
7279 | bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */ |
7280 | /* Grab control of the terminal */ |
7281 | tcsetpgrp(G_interactive_fd, getpid()); |
7282 | } |
7283 | /* -1 is special - makes xfuncs longjmp, not exit |
7284 | * (we reset die_sleep = 0 whereever we [v]fork) */ |
7285 | enable_restore_tty_pgrp_on_exit(); /* sets die_sleep = -1 */ |
7286 | } else { |
7287 | init_sigmasks(); |
7288 | } |
7289 | #elif ENABLE_HUSH_INTERACTIVE |
7290 | /* No job control compiled in, only prompt/line editing */ |
7291 | if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) { |
7292 | G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255); |
7293 | if (G_interactive_fd < 0) { |
7294 | /* try to dup to any fd */ |
7295 | G_interactive_fd = dup(STDIN_FILENO); |
7296 | if (G_interactive_fd < 0) |
7297 | /* give up */ |
7298 | G_interactive_fd = 0; |
7299 | } |
7300 | } |
7301 | if (G_interactive_fd) { |
7302 | close_on_exec_on(G_interactive_fd); |
7303 | } |
7304 | init_sigmasks(); |
7305 | #else |
7306 | /* We have interactiveness code disabled */ |
7307 | init_sigmasks(); |
7308 | #endif |
7309 | /* bash: |
7310 | * if interactive but not a login shell, sources ~/.bashrc |
7311 | * (--norc turns this off, --rcfile <file> overrides) |
7312 | */ |
7313 | |
7314 | if (!ENABLE_FEATURE_SH_EXTRA_QUIET && G_interactive_fd) { |
7315 | /* note: ash and hush share this string */ |
7316 | printf("\n\n%s %s\n" |
7317 | IF_HUSH_HELP("Enter 'help' for a list of built-in commands.\n") |
7318 | "\n", |
7319 | bb_banner, |
7320 | "hush - the humble shell" |
7321 | ); |
7322 | } |
7323 | |
7324 | parse_and_run_file(stdin); |
7325 | |
7326 | final_return: |
7327 | #if ENABLE_FEATURE_CLEAN_UP |
7328 | if (G.cwd != bb_msg_unknown) |
7329 | free((char*)G.cwd); |
7330 | cur_var = G.top_var->next; |
7331 | while (cur_var) { |
7332 | struct variable *tmp = cur_var; |
7333 | if (!cur_var->max_len) |
7334 | free(cur_var->varstr); |
7335 | cur_var = cur_var->next; |
7336 | free(tmp); |
7337 | } |
7338 | #endif |
7339 | hush_exit(G.last_exitcode); |
7340 | } |
7341 | |
7342 | |
7343 | #if ENABLE_LASH |
7344 | int lash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
7345 | int lash_main(int argc, char **argv) |
7346 | { |
7347 | bb_error_msg("lash is deprecated, please use hush instead"); |
7348 | return hush_main(argc, argv); |
7349 | } |
7350 | #endif |
7351 | |
7352 | #if ENABLE_MSH |
7353 | int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
7354 | int msh_main(int argc, char **argv) |
7355 | { |
7356 | //bb_error_msg("msh is deprecated, please use hush instead"); |
7357 | return hush_main(argc, argv); |
7358 | } |
7359 | #endif |
7360 | |
7361 | |
7362 | /* |
7363 | * Built-ins |
7364 | */ |
7365 | static int FAST_FUNC builtin_true(char **argv UNUSED_PARAM) |
7366 | { |
7367 | return 0; |
7368 | } |
7369 | |
7370 | static int run_applet_main(char **argv, int (*applet_main_func)(int argc, char **argv)) |
7371 | { |
7372 | int argc = 0; |
7373 | while (*argv) { |
7374 | argc++; |
7375 | argv++; |
7376 | } |
7377 | return applet_main_func(argc, argv - argc); |
7378 | } |
7379 | |
7380 | static int FAST_FUNC builtin_test(char **argv) |
7381 | { |
7382 | return run_applet_main(argv, test_main); |
7383 | } |
7384 | |
7385 | static int FAST_FUNC builtin_echo(char **argv) |
7386 | { |
7387 | return run_applet_main(argv, echo_main); |
7388 | } |
7389 | |
7390 | #if ENABLE_PRINTF |
7391 | static int FAST_FUNC builtin_printf(char **argv) |
7392 | { |
7393 | return run_applet_main(argv, printf_main); |
7394 | } |
7395 | #endif |
7396 | |
7397 | static char **skip_dash_dash(char **argv) |
7398 | { |
7399 | argv++; |
7400 | if (argv[0] && argv[0][0] == '-' && argv[0][1] == '-' && argv[0][2] == '\0') |
7401 | argv++; |
7402 | return argv; |
7403 | } |
7404 | |
7405 | static int FAST_FUNC builtin_eval(char **argv) |
7406 | { |
7407 | int rcode = EXIT_SUCCESS; |
7408 | |
7409 | argv = skip_dash_dash(argv); |
7410 | if (*argv) { |
7411 | char *str = expand_strvec_to_string(argv); |
7412 | /* bash: |
7413 | * eval "echo Hi; done" ("done" is syntax error): |
7414 | * "echo Hi" will not execute too. |
7415 | */ |
7416 | parse_and_run_string(str); |
7417 | free(str); |
7418 | rcode = G.last_exitcode; |
7419 | } |
7420 | return rcode; |
7421 | } |
7422 | |
7423 | static int FAST_FUNC builtin_cd(char **argv) |
7424 | { |
7425 | const char *newdir; |
7426 | |
7427 | argv = skip_dash_dash(argv); |
7428 | newdir = argv[0]; |
7429 | if (newdir == NULL) { |
7430 | /* bash does nothing (exitcode 0) if HOME is ""; if it's unset, |
7431 | * bash says "bash: cd: HOME not set" and does nothing |
7432 | * (exitcode 1) |
7433 | */ |
7434 | const char *home = get_local_var_value("HOME"); |
7435 | newdir = home ? home : "/"; |
7436 | } |
7437 | if (chdir(newdir)) { |
7438 | /* Mimic bash message exactly */ |
7439 | bb_perror_msg("cd: %s", newdir); |
7440 | return EXIT_FAILURE; |
7441 | } |
7442 | /* Read current dir (get_cwd(1) is inside) and set PWD. |
7443 | * Note: do not enforce exporting. If PWD was unset or unexported, |
7444 | * set it again, but do not export. bash does the same. |
7445 | */ |
7446 | set_pwd_var(/*exp:*/ 0); |
7447 | return EXIT_SUCCESS; |
7448 | } |
7449 | |
7450 | static int FAST_FUNC builtin_exec(char **argv) |
7451 | { |
7452 | argv = skip_dash_dash(argv); |
7453 | if (argv[0] == NULL) |
7454 | return EXIT_SUCCESS; /* bash does this */ |
7455 | |
7456 | /* Careful: we can end up here after [v]fork. Do not restore |
7457 | * tty pgrp then, only top-level shell process does that */ |
7458 | if (G_saved_tty_pgrp && getpid() == G.root_pid) |
7459 | tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp); |
7460 | |
7461 | /* TODO: if exec fails, bash does NOT exit! We do. |
7462 | * We'll need to undo sigprocmask (it's inside execvp_or_die) |
7463 | * and tcsetpgrp, and this is inherently racy. |
7464 | */ |
7465 | execvp_or_die(argv); |
7466 | } |
7467 | |
7468 | static int FAST_FUNC builtin_exit(char **argv) |
7469 | { |
7470 | debug_printf_exec("%s()\n", __func__); |
7471 | |
7472 | /* interactive bash: |
7473 | * # trap "echo EEE" EXIT |
7474 | * # exit |
7475 | * exit |
7476 | * There are stopped jobs. |
7477 | * (if there are _stopped_ jobs, running ones don't count) |
7478 | * # exit |
7479 | * exit |
7480 | # EEE (then bash exits) |
7481 | * |
7482 | * we can use G.exiting = -1 as indicator "last cmd was exit" |
7483 | */ |
7484 | |
7485 | /* note: EXIT trap is run by hush_exit */ |
7486 | argv = skip_dash_dash(argv); |
7487 | if (argv[0] == NULL) |
7488 | hush_exit(G.last_exitcode); |
7489 | /* mimic bash: exit 123abc == exit 255 + error msg */ |
7490 | xfunc_error_retval = 255; |
7491 | /* bash: exit -2 == exit 254, no error msg */ |
7492 | hush_exit(xatoi(argv[0]) & 0xff); |
7493 | } |
7494 | |
7495 | static void print_escaped(const char *s) |
7496 | { |
7497 | if (*s == '\'') |
7498 | goto squote; |
7499 | do { |
7500 | const char *p = strchrnul(s, '\''); |
7501 | /* print 'xxxx', possibly just '' */ |
7502 | printf("'%.*s'", (int)(p - s), s); |
7503 | if (*p == '\0') |
7504 | break; |
7505 | s = p; |
7506 | squote: |
7507 | /* s points to '; print "'''...'''" */ |
7508 | putchar('"'); |
7509 | do putchar('\''); while (*++s == '\''); |
7510 | putchar('"'); |
7511 | } while (*s); |
7512 | } |
7513 | |
7514 | #if !ENABLE_HUSH_LOCAL |
7515 | #define helper_export_local(argv, exp, lvl) \ |
7516 | helper_export_local(argv, exp) |
7517 | #endif |
7518 | static void helper_export_local(char **argv, int exp, int lvl) |
7519 | { |
7520 | do { |
7521 | char *name = *argv; |
7522 | |
7523 | /* So far we do not check that name is valid (TODO?) */ |
7524 | |
7525 | if (strchr(name, '=') == NULL) { |
7526 | struct variable *var; |
7527 | |
7528 | var = get_local_var(name); |
7529 | if (exp == -1) { /* unexporting? */ |
7530 | /* export -n NAME (without =VALUE) */ |
7531 | if (var) { |
7532 | var->flg_export = 0; |
7533 | debug_printf_env("%s: unsetenv '%s'\n", __func__, name); |
7534 | unsetenv(name); |
7535 | } /* else: export -n NOT_EXISTING_VAR: no-op */ |
7536 | continue; |
7537 | } |
7538 | if (exp == 1) { /* exporting? */ |
7539 | /* export NAME (without =VALUE) */ |
7540 | if (var) { |
7541 | var->flg_export = 1; |
7542 | debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr); |
7543 | putenv(var->varstr); |
7544 | continue; |
7545 | } |
7546 | } |
7547 | /* Exporting non-existing variable. |
7548 | * bash does not put it in environment, |
7549 | * but remembers that it is exported, |
7550 | * and does put it in env when it is set later. |
7551 | * We just set it to "" and export. */ |
7552 | /* Or, it's "local NAME" (without =VALUE). |
7553 | * bash sets the value to "". */ |
7554 | name = xasprintf("%s=", name); |
7555 | } else { |
7556 | /* (Un)exporting/making local NAME=VALUE */ |
7557 | name = xstrdup(name); |
7558 | } |
7559 | set_local_var(name, /*exp:*/ exp, /*lvl:*/ lvl, /*ro:*/ 0); |
7560 | } while (*++argv); |
7561 | } |
7562 | |
7563 | static int FAST_FUNC builtin_export(char **argv) |
7564 | { |
7565 | unsigned opt_unexport; |
7566 | |
7567 | #if ENABLE_HUSH_EXPORT_N |
7568 | /* "!": do not abort on errors */ |
7569 | opt_unexport = getopt32(argv, "!n"); |
7570 | if (opt_unexport == (uint32_t)-1) |
7571 | return EXIT_FAILURE; |
7572 | argv += optind; |
7573 | #else |
7574 | opt_unexport = 0; |
7575 | argv++; |
7576 | #endif |
7577 | |
7578 | if (argv[0] == NULL) { |
7579 | char **e = environ; |
7580 | if (e) { |
7581 | while (*e) { |
7582 | #if 0 |
7583 | puts(*e++); |
7584 | #else |
7585 | /* ash emits: export VAR='VAL' |
7586 | * bash: declare -x VAR="VAL" |
7587 | * we follow ash example */ |
7588 | const char *s = *e++; |
7589 | const char *p = strchr(s, '='); |
7590 | |
7591 | if (!p) /* wtf? take next variable */ |
7592 | continue; |
7593 | /* export var= */ |
7594 | printf("export %.*s", (int)(p - s) + 1, s); |
7595 | print_escaped(p + 1); |
7596 | putchar('\n'); |
7597 | #endif |
7598 | } |
7599 | /*fflush_all(); - done after each builtin anyway */ |
7600 | } |
7601 | return EXIT_SUCCESS; |
7602 | } |
7603 | |
7604 | helper_export_local(argv, (opt_unexport ? -1 : 1), 0); |
7605 | |
7606 | return EXIT_SUCCESS; |
7607 | } |
7608 | |
7609 | #if ENABLE_HUSH_LOCAL |
7610 | static int FAST_FUNC builtin_local(char **argv) |
7611 | { |
7612 | if (G.func_nest_level == 0) { |
7613 | bb_error_msg("%s: not in a function", argv[0]); |
7614 | return EXIT_FAILURE; /* bash compat */ |
7615 | } |
7616 | helper_export_local(argv, 0, G.func_nest_level); |
7617 | return EXIT_SUCCESS; |
7618 | } |
7619 | #endif |
7620 | |
7621 | static int FAST_FUNC builtin_trap(char **argv) |
7622 | { |
7623 | int sig; |
7624 | char *new_cmd; |
7625 | |
7626 | if (!G.traps) |
7627 | G.traps = xzalloc(sizeof(G.traps[0]) * NSIG); |
7628 | |
7629 | argv++; |
7630 | if (!*argv) { |
7631 | int i; |
7632 | /* No args: print all trapped */ |
7633 | for (i = 0; i < NSIG; ++i) { |
7634 | if (G.traps[i]) { |
7635 | printf("trap -- "); |
7636 | print_escaped(G.traps[i]); |
7637 | /* note: bash adds "SIG", but only if invoked |
7638 | * as "bash". If called as "sh", or if set -o posix, |
7639 | * then it prints short signal names. |
7640 | * We are printing short names: */ |
7641 | printf(" %s\n", get_signame(i)); |
7642 | } |
7643 | } |
7644 | /*fflush_all(); - done after each builtin anyway */ |
7645 | return EXIT_SUCCESS; |
7646 | } |
7647 | |
7648 | new_cmd = NULL; |
7649 | /* If first arg is a number: reset all specified signals */ |
7650 | sig = bb_strtou(*argv, NULL, 10); |
7651 | if (errno == 0) { |
7652 | int ret; |
7653 | process_sig_list: |
7654 | ret = EXIT_SUCCESS; |
7655 | while (*argv) { |
7656 | sig = get_signum(*argv++); |
7657 | if (sig < 0 || sig >= NSIG) { |
7658 | ret = EXIT_FAILURE; |
7659 | /* Mimic bash message exactly */ |
7660 | bb_perror_msg("trap: %s: invalid signal specification", argv[-1]); |
7661 | continue; |
7662 | } |
7663 | |
7664 | free(G.traps[sig]); |
7665 | G.traps[sig] = xstrdup(new_cmd); |
7666 | |
7667 | debug_printf("trap: setting SIG%s (%i) to '%s'\n", |
7668 | get_signame(sig), sig, G.traps[sig]); |
7669 | |
7670 | /* There is no signal for 0 (EXIT) */ |
7671 | if (sig == 0) |
7672 | continue; |
7673 | |
7674 | if (new_cmd) { |
7675 | sigaddset(&G.blocked_set, sig); |
7676 | } else { |
7677 | /* There was a trap handler, we are removing it |
7678 | * (if sig has non-DFL handling, |
7679 | * we don't need to do anything) */ |
7680 | if (sig < 32 && (G.non_DFL_mask & (1 << sig))) |
7681 | continue; |
7682 | sigdelset(&G.blocked_set, sig); |
7683 | } |
7684 | } |
7685 | sigprocmask(SIG_SETMASK, &G.blocked_set, NULL); |
7686 | return ret; |
7687 | } |
7688 | |
7689 | if (!argv[1]) { /* no second arg */ |
7690 | bb_error_msg("trap: invalid arguments"); |
7691 | return EXIT_FAILURE; |
7692 | } |
7693 | |
7694 | /* First arg is "-": reset all specified to default */ |
7695 | /* First arg is "--": skip it, the rest is "handler SIGs..." */ |
7696 | /* Everything else: set arg as signal handler |
7697 | * (includes "" case, which ignores signal) */ |
7698 | if (argv[0][0] == '-') { |
7699 | if (argv[0][1] == '\0') { /* "-" */ |
7700 | /* new_cmd remains NULL: "reset these sigs" */ |
7701 | goto reset_traps; |
7702 | } |
7703 | if (argv[0][1] == '-' && argv[0][2] == '\0') { /* "--" */ |
7704 | argv++; |
7705 | } |
7706 | /* else: "-something", no special meaning */ |
7707 | } |
7708 | new_cmd = *argv; |
7709 | reset_traps: |
7710 | argv++; |
7711 | goto process_sig_list; |
7712 | } |
7713 | |
7714 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/type.html */ |
7715 | static int FAST_FUNC builtin_type(char **argv) |
7716 | { |
7717 | int ret = EXIT_SUCCESS; |
7718 | |
7719 | while (*++argv) { |
7720 | const char *type; |
7721 | char *path = NULL; |
7722 | |
7723 | if (0) {} /* make conditional compile easier below */ |
7724 | /*else if (find_alias(*argv)) |
7725 | type = "an alias";*/ |
7726 | #if ENABLE_HUSH_FUNCTIONS |
7727 | else if (find_function(*argv)) |
7728 | type = "a function"; |
7729 | #endif |
7730 | else if (find_builtin(*argv)) |
7731 | type = "a shell builtin"; |
7732 | else if ((path = find_in_path(*argv)) != NULL) |
7733 | type = path; |
7734 | else { |
7735 | bb_error_msg("type: %s: not found", *argv); |
7736 | ret = EXIT_FAILURE; |
7737 | continue; |
7738 | } |
7739 | |
7740 | printf("%s is %s\n", *argv, type); |
7741 | free(path); |
7742 | } |
7743 | |
7744 | return ret; |
7745 | } |
7746 | |
7747 | #if ENABLE_HUSH_JOB |
7748 | /* built-in 'fg' and 'bg' handler */ |
7749 | static int FAST_FUNC builtin_fg_bg(char **argv) |
7750 | { |
7751 | int i, jobnum; |
7752 | struct pipe *pi; |
7753 | |
7754 | if (!G_interactive_fd) |
7755 | return EXIT_FAILURE; |
7756 | |
7757 | /* If they gave us no args, assume they want the last backgrounded task */ |
7758 | if (!argv[1]) { |
7759 | for (pi = G.job_list; pi; pi = pi->next) { |
7760 | if (pi->jobid == G.last_jobid) { |
7761 | goto found; |
7762 | } |
7763 | } |
7764 | bb_error_msg("%s: no current job", argv[0]); |
7765 | return EXIT_FAILURE; |
7766 | } |
7767 | if (sscanf(argv[1], "%%%d", &jobnum) != 1) { |
7768 | bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]); |
7769 | return EXIT_FAILURE; |
7770 | } |
7771 | for (pi = G.job_list; pi; pi = pi->next) { |
7772 | if (pi->jobid == jobnum) { |
7773 | goto found; |
7774 | } |
7775 | } |
7776 | bb_error_msg("%s: %d: no such job", argv[0], jobnum); |
7777 | return EXIT_FAILURE; |
7778 | found: |
7779 | /* TODO: bash prints a string representation |
7780 | * of job being foregrounded (like "sleep 1 | cat") */ |
7781 | if (argv[0][0] == 'f' && G_saved_tty_pgrp) { |
7782 | /* Put the job into the foreground. */ |
7783 | tcsetpgrp(G_interactive_fd, pi->pgrp); |
7784 | } |
7785 | |
7786 | /* Restart the processes in the job */ |
7787 | debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp); |
7788 | for (i = 0; i < pi->num_cmds; i++) { |
7789 | debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid); |
7790 | pi->cmds[i].is_stopped = 0; |
7791 | } |
7792 | pi->stopped_cmds = 0; |
7793 | |
7794 | i = kill(- pi->pgrp, SIGCONT); |
7795 | if (i < 0) { |
7796 | if (errno == ESRCH) { |
7797 | delete_finished_bg_job(pi); |
7798 | return EXIT_SUCCESS; |
7799 | } |
7800 | bb_perror_msg("kill (SIGCONT)"); |
7801 | } |
7802 | |
7803 | if (argv[0][0] == 'f') { |
7804 | remove_bg_job(pi); |
7805 | return checkjobs_and_fg_shell(pi); |
7806 | } |
7807 | return EXIT_SUCCESS; |
7808 | } |
7809 | #endif |
7810 | |
7811 | #if ENABLE_HUSH_HELP |
7812 | static int FAST_FUNC builtin_help(char **argv UNUSED_PARAM) |
7813 | { |
7814 | const struct built_in_command *x; |
7815 | |
7816 | printf( |
7817 | "Built-in commands:\n" |
7818 | "------------------\n"); |
7819 | for (x = bltins1; x != &bltins1[ARRAY_SIZE(bltins1)]; x++) { |
7820 | if (x->b_descr) |
7821 | printf("%-10s%s\n", x->b_cmd, x->b_descr); |
7822 | } |
7823 | bb_putchar('\n'); |
7824 | return EXIT_SUCCESS; |
7825 | } |
7826 | #endif |
7827 | |
7828 | #if ENABLE_HUSH_JOB |
7829 | static int FAST_FUNC builtin_jobs(char **argv UNUSED_PARAM) |
7830 | { |
7831 | struct pipe *job; |
7832 | const char *status_string; |
7833 | |
7834 | for (job = G.job_list; job; job = job->next) { |
7835 | if (job->alive_cmds == job->stopped_cmds) |
7836 | status_string = "Stopped"; |
7837 | else |
7838 | status_string = "Running"; |
7839 | |
7840 | printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext); |
7841 | } |
7842 | return EXIT_SUCCESS; |
7843 | } |
7844 | #endif |
7845 | |
7846 | #if HUSH_DEBUG |
7847 | static int FAST_FUNC builtin_memleak(char **argv UNUSED_PARAM) |
7848 | { |
7849 | void *p; |
7850 | unsigned long l; |
7851 | |
7852 | # ifdef M_TRIM_THRESHOLD |
7853 | /* Optional. Reduces probability of false positives */ |
7854 | malloc_trim(0); |
7855 | # endif |
7856 | /* Crude attempt to find where "free memory" starts, |
7857 | * sans fragmentation. */ |
7858 | p = malloc(240); |
7859 | l = (unsigned long)p; |
7860 | free(p); |
7861 | p = malloc(3400); |
7862 | if (l < (unsigned long)p) l = (unsigned long)p; |
7863 | free(p); |
7864 | |
7865 | if (!G.memleak_value) |
7866 | G.memleak_value = l; |
7867 | |
7868 | l -= G.memleak_value; |
7869 | if ((long)l < 0) |
7870 | l = 0; |
7871 | l /= 1024; |
7872 | if (l > 127) |
7873 | l = 127; |
7874 | |
7875 | /* Exitcode is "how many kilobytes we leaked since 1st call" */ |
7876 | return l; |
7877 | } |
7878 | #endif |
7879 | |
7880 | static int FAST_FUNC builtin_pwd(char **argv UNUSED_PARAM) |
7881 | { |
7882 | puts(get_cwd(0)); |
7883 | return EXIT_SUCCESS; |
7884 | } |
7885 | |
7886 | static int FAST_FUNC builtin_read(char **argv) |
7887 | { |
7888 | const char *r; |
7889 | char *opt_n = NULL; |
7890 | char *opt_p = NULL; |
7891 | char *opt_t = NULL; |
7892 | char *opt_u = NULL; |
7893 | int read_flags; |
7894 | |
7895 | /* "!": do not abort on errors. |
7896 | * Option string must start with "sr" to match BUILTIN_READ_xxx |
7897 | */ |
7898 | read_flags = getopt32(argv, "!srn:p:t:u:", &opt_n, &opt_p, &opt_t, &opt_u); |
7899 | if (read_flags == (uint32_t)-1) |
7900 | return EXIT_FAILURE; |
7901 | argv += optind; |
7902 | |
7903 | r = shell_builtin_read(set_local_var_from_halves, |
7904 | argv, |
7905 | get_local_var_value("IFS"), /* can be NULL */ |
7906 | read_flags, |
7907 | opt_n, |
7908 | opt_p, |
7909 | opt_t, |
7910 | opt_u |
7911 | ); |
7912 | |
7913 | if ((uintptr_t)r > 1) { |
7914 | bb_error_msg("%s", r); |
7915 | r = (char*)(uintptr_t)1; |
7916 | } |
7917 | |
7918 | return (uintptr_t)r; |
7919 | } |
7920 | |
7921 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set |
7922 | * built-in 'set' handler |
7923 | * SUSv3 says: |
7924 | * set [-abCefhmnuvx] [-o option] [argument...] |
7925 | * set [+abCefhmnuvx] [+o option] [argument...] |
7926 | * set -- [argument...] |
7927 | * set -o |
7928 | * set +o |
7929 | * Implementations shall support the options in both their hyphen and |
7930 | * plus-sign forms. These options can also be specified as options to sh. |
7931 | * Examples: |
7932 | * Write out all variables and their values: set |
7933 | * Set $1, $2, and $3 and set "$#" to 3: set c a b |
7934 | * Turn on the -x and -v options: set -xv |
7935 | * Unset all positional parameters: set -- |
7936 | * Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x" |
7937 | * Set the positional parameters to the expansion of x, even if x expands |
7938 | * with a leading '-' or '+': set -- $x |
7939 | * |
7940 | * So far, we only support "set -- [argument...]" and some of the short names. |
7941 | */ |
7942 | static int FAST_FUNC builtin_set(char **argv) |
7943 | { |
7944 | int n; |
7945 | char **pp, **g_argv; |
7946 | char *arg = *++argv; |
7947 | |
7948 | if (arg == NULL) { |
7949 | struct variable *e; |
7950 | for (e = G.top_var; e; e = e->next) |
7951 | puts(e->varstr); |
7952 | return EXIT_SUCCESS; |
7953 | } |
7954 | |
7955 | do { |
7956 | if (!strcmp(arg, "--")) { |
7957 | ++argv; |
7958 | goto set_argv; |
7959 | } |
7960 | if (arg[0] != '+' && arg[0] != '-') |
7961 | break; |
7962 | for (n = 1; arg[n]; ++n) |
7963 | if (set_mode(arg[0], arg[n])) |
7964 | goto error; |
7965 | } while ((arg = *++argv) != NULL); |
7966 | /* Now argv[0] is 1st argument */ |
7967 | |
7968 | if (arg == NULL) |
7969 | return EXIT_SUCCESS; |
7970 | set_argv: |
7971 | |
7972 | /* NB: G.global_argv[0] ($0) is never freed/changed */ |
7973 | g_argv = G.global_argv; |
7974 | if (G.global_args_malloced) { |
7975 | pp = g_argv; |
7976 | while (*++pp) |
7977 | free(*pp); |
7978 | g_argv[1] = NULL; |
7979 | } else { |
7980 | G.global_args_malloced = 1; |
7981 | pp = xzalloc(sizeof(pp[0]) * 2); |
7982 | pp[0] = g_argv[0]; /* retain $0 */ |
7983 | g_argv = pp; |
7984 | } |
7985 | /* This realloc's G.global_argv */ |
7986 | G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1); |
7987 | |
7988 | n = 1; |
7989 | while (*++pp) |
7990 | n++; |
7991 | G.global_argc = n; |
7992 | |
7993 | return EXIT_SUCCESS; |
7994 | |
7995 | /* Nothing known, so abort */ |
7996 | error: |
7997 | bb_error_msg("set: %s: invalid option", arg); |
7998 | return EXIT_FAILURE; |
7999 | } |
8000 | |
8001 | static int FAST_FUNC builtin_shift(char **argv) |
8002 | { |
8003 | int n = 1; |
8004 | argv = skip_dash_dash(argv); |
8005 | if (argv[0]) { |
8006 | n = atoi(argv[0]); |
8007 | } |
8008 | if (n >= 0 && n < G.global_argc) { |
8009 | if (G.global_args_malloced) { |
8010 | int m = 1; |
8011 | while (m <= n) |
8012 | free(G.global_argv[m++]); |
8013 | } |
8014 | G.global_argc -= n; |
8015 | memmove(&G.global_argv[1], &G.global_argv[n+1], |
8016 | G.global_argc * sizeof(G.global_argv[0])); |
8017 | return EXIT_SUCCESS; |
8018 | } |
8019 | return EXIT_FAILURE; |
8020 | } |
8021 | |
8022 | static int FAST_FUNC builtin_source(char **argv) |
8023 | { |
8024 | char *arg_path, *filename; |
8025 | FILE *input; |
8026 | save_arg_t sv; |
8027 | #if ENABLE_HUSH_FUNCTIONS |
8028 | smallint sv_flg; |
8029 | #endif |
8030 | |
8031 | argv = skip_dash_dash(argv); |
8032 | filename = argv[0]; |
8033 | if (!filename) { |
8034 | /* bash says: "bash: .: filename argument required" */ |
8035 | return 2; /* bash compat */ |
8036 | } |
8037 | arg_path = NULL; |
8038 | if (!strchr(filename, '/')) { |
8039 | arg_path = find_in_path(filename); |
8040 | if (arg_path) |
8041 | filename = arg_path; |
8042 | } |
8043 | input = fopen_or_warn(filename, "r"); |
8044 | free(arg_path); |
8045 | if (!input) { |
8046 | /* bb_perror_msg("%s", *argv); - done by fopen_or_warn */ |
8047 | return EXIT_FAILURE; |
8048 | } |
8049 | close_on_exec_on(fileno(input)); |
8050 | |
8051 | #if ENABLE_HUSH_FUNCTIONS |
8052 | sv_flg = G.flag_return_in_progress; |
8053 | /* "we are inside sourced file, ok to use return" */ |
8054 | G.flag_return_in_progress = -1; |
8055 | #endif |
8056 | save_and_replace_G_args(&sv, argv); |
8057 | |
8058 | parse_and_run_file(input); |
8059 | fclose(input); |
8060 | |
8061 | restore_G_args(&sv, argv); |
8062 | #if ENABLE_HUSH_FUNCTIONS |
8063 | G.flag_return_in_progress = sv_flg; |
8064 | #endif |
8065 | |
8066 | return G.last_exitcode; |
8067 | } |
8068 | |
8069 | static int FAST_FUNC builtin_umask(char **argv) |
8070 | { |
8071 | int rc; |
8072 | mode_t mask; |
8073 | |
8074 | mask = umask(0); |
8075 | argv = skip_dash_dash(argv); |
8076 | if (argv[0]) { |
8077 | mode_t old_mask = mask; |
8078 | |
8079 | mask ^= 0777; |
8080 | rc = bb_parse_mode(argv[0], &mask); |
8081 | mask ^= 0777; |
8082 | if (rc == 0) { |
8083 | mask = old_mask; |
8084 | /* bash messages: |
8085 | * bash: umask: 'q': invalid symbolic mode operator |
8086 | * bash: umask: 999: octal number out of range |
8087 | */ |
8088 | bb_error_msg("%s: invalid mode '%s'", "umask", argv[0]); |
8089 | } |
8090 | } else { |
8091 | rc = 1; |
8092 | /* Mimic bash */ |
8093 | printf("%04o\n", (unsigned) mask); |
8094 | /* fall through and restore mask which we set to 0 */ |
8095 | } |
8096 | umask(mask); |
8097 | |
8098 | return !rc; /* rc != 0 - success */ |
8099 | } |
8100 | |
8101 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#unset */ |
8102 | static int FAST_FUNC builtin_unset(char **argv) |
8103 | { |
8104 | int ret; |
8105 | unsigned opts; |
8106 | |
8107 | /* "!": do not abort on errors */ |
8108 | /* "+": stop at 1st non-option */ |
8109 | opts = getopt32(argv, "!+vf"); |
8110 | if (opts == (unsigned)-1) |
8111 | return EXIT_FAILURE; |
8112 | if (opts == 3) { |
8113 | bb_error_msg("unset: -v and -f are exclusive"); |
8114 | return EXIT_FAILURE; |
8115 | } |
8116 | argv += optind; |
8117 | |
8118 | ret = EXIT_SUCCESS; |
8119 | while (*argv) { |
8120 | if (!(opts & 2)) { /* not -f */ |
8121 | if (unset_local_var(*argv)) { |
8122 | /* unset <nonexistent_var> doesn't fail. |
8123 | * Error is when one tries to unset RO var. |
8124 | * Message was printed by unset_local_var. */ |
8125 | ret = EXIT_FAILURE; |
8126 | } |
8127 | } |
8128 | #if ENABLE_HUSH_FUNCTIONS |
8129 | else { |
8130 | unset_func(*argv); |
8131 | } |
8132 | #endif |
8133 | argv++; |
8134 | } |
8135 | return ret; |
8136 | } |
8137 | |
8138 | /* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */ |
8139 | static int FAST_FUNC builtin_wait(char **argv) |
8140 | { |
8141 | int ret = EXIT_SUCCESS; |
8142 | int status, sig; |
8143 | |
8144 | argv = skip_dash_dash(argv); |
8145 | if (argv[0] == NULL) { |
8146 | /* Don't care about wait results */ |
8147 | /* Note 1: must wait until there are no more children */ |
8148 | /* Note 2: must be interruptible */ |
8149 | /* Examples: |
8150 | * $ sleep 3 & sleep 6 & wait |
8151 | * [1] 30934 sleep 3 |
8152 | * [2] 30935 sleep 6 |
8153 | * [1] Done sleep 3 |
8154 | * [2] Done sleep 6 |
8155 | * $ sleep 3 & sleep 6 & wait |
8156 | * [1] 30936 sleep 3 |
8157 | * [2] 30937 sleep 6 |
8158 | * [1] Done sleep 3 |
8159 | * ^C <-- after ~4 sec from keyboard |
8160 | * $ |
8161 | */ |
8162 | sigaddset(&G.blocked_set, SIGCHLD); |
8163 | sigprocmask(SIG_SETMASK, &G.blocked_set, NULL); |
8164 | while (1) { |
8165 | checkjobs(NULL); |
8166 | if (errno == ECHILD) |
8167 | break; |
8168 | /* Wait for SIGCHLD or any other signal of interest */ |
8169 | /* sigtimedwait with infinite timeout: */ |
8170 | sig = sigwaitinfo(&G.blocked_set, NULL); |
8171 | if (sig > 0) { |
8172 | sig = check_and_run_traps(sig); |
8173 | if (sig && sig != SIGCHLD) { /* see note 2 */ |
8174 | ret = 128 + sig; |
8175 | break; |
8176 | } |
8177 | } |
8178 | } |
8179 | sigdelset(&G.blocked_set, SIGCHLD); |
8180 | sigprocmask(SIG_SETMASK, &G.blocked_set, NULL); |
8181 | return ret; |
8182 | } |
8183 | |
8184 | /* This is probably buggy wrt interruptible-ness */ |
8185 | while (*argv) { |
8186 | pid_t pid = bb_strtou(*argv, NULL, 10); |
8187 | if (errno) { |
8188 | /* mimic bash message */ |
8189 | bb_error_msg("wait: '%s': not a pid or valid job spec", *argv); |
8190 | return EXIT_FAILURE; |
8191 | } |
8192 | if (waitpid(pid, &status, 0) == pid) { |
8193 | if (WIFSIGNALED(status)) |
8194 | ret = 128 + WTERMSIG(status); |
8195 | else if (WIFEXITED(status)) |
8196 | ret = WEXITSTATUS(status); |
8197 | else /* wtf? */ |
8198 | ret = EXIT_FAILURE; |
8199 | } else { |
8200 | bb_perror_msg("wait %s", *argv); |
8201 | ret = 127; |
8202 | } |
8203 | argv++; |
8204 | } |
8205 | |
8206 | return ret; |
8207 | } |
8208 | |
8209 | #if ENABLE_HUSH_LOOPS || ENABLE_HUSH_FUNCTIONS |
8210 | static unsigned parse_numeric_argv1(char **argv, unsigned def, unsigned def_min) |
8211 | { |
8212 | if (argv[1]) { |
8213 | def = bb_strtou(argv[1], NULL, 10); |
8214 | if (errno || def < def_min || argv[2]) { |
8215 | bb_error_msg("%s: bad arguments", argv[0]); |
8216 | def = UINT_MAX; |
8217 | } |
8218 | } |
8219 | return def; |
8220 | } |
8221 | #endif |
8222 | |
8223 | #if ENABLE_HUSH_LOOPS |
8224 | static int FAST_FUNC builtin_break(char **argv) |
8225 | { |
8226 | unsigned depth; |
8227 | if (G.depth_of_loop == 0) { |
8228 | bb_error_msg("%s: only meaningful in a loop", argv[0]); |
8229 | return EXIT_SUCCESS; /* bash compat */ |
8230 | } |
8231 | G.flag_break_continue++; /* BC_BREAK = 1 */ |
8232 | |
8233 | G.depth_break_continue = depth = parse_numeric_argv1(argv, 1, 1); |
8234 | if (depth == UINT_MAX) |
8235 | G.flag_break_continue = BC_BREAK; |
8236 | if (G.depth_of_loop < depth) |
8237 | G.depth_break_continue = G.depth_of_loop; |
8238 | |
8239 | return EXIT_SUCCESS; |
8240 | } |
8241 | |
8242 | static int FAST_FUNC builtin_continue(char **argv) |
8243 | { |
8244 | G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */ |
8245 | return builtin_break(argv); |
8246 | } |
8247 | #endif |
8248 | |
8249 | #if ENABLE_HUSH_FUNCTIONS |
8250 | static int FAST_FUNC builtin_return(char **argv) |
8251 | { |
8252 | int rc; |
8253 | |
8254 | if (G.flag_return_in_progress != -1) { |
8255 | bb_error_msg("%s: not in a function or sourced script", argv[0]); |
8256 | return EXIT_FAILURE; /* bash compat */ |
8257 | } |
8258 | |
8259 | G.flag_return_in_progress = 1; |
8260 | |
8261 | /* bash: |
8262 | * out of range: wraps around at 256, does not error out |
8263 | * non-numeric param: |
8264 | * f() { false; return qwe; }; f; echo $? |
8265 | * bash: return: qwe: numeric argument required <== we do this |
8266 | * 255 <== we also do this |
8267 | */ |
8268 | rc = parse_numeric_argv1(argv, G.last_exitcode, 0); |
8269 | return rc; |
8270 | } |
8271 | #endif |