Contents of /trunk/mkinitrd-magellan/busybox/miscutils/devfsd.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 60286 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
4 | */ |
5 | |
6 | /* |
7 | devfsd implementation for busybox |
8 | |
9 | Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it> |
10 | |
11 | Busybox version is based on some previous work and ideas |
12 | Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it> |
13 | |
14 | devfsd.c |
15 | |
16 | Main file for devfsd (devfs daemon for Linux). |
17 | |
18 | Copyright (C) 1998-2002 Richard Gooch |
19 | |
20 | devfsd.h |
21 | |
22 | Header file for devfsd (devfs daemon for Linux). |
23 | |
24 | Copyright (C) 1998-2000 Richard Gooch |
25 | |
26 | compat_name.c |
27 | |
28 | Compatibility name file for devfsd (build compatibility names). |
29 | |
30 | Copyright (C) 1998-2002 Richard Gooch |
31 | |
32 | expression.c |
33 | |
34 | This code provides Borne Shell-like expression expansion. |
35 | |
36 | Copyright (C) 1997-1999 Richard Gooch |
37 | |
38 | This program is free software; you can redistribute it and/or modify |
39 | it under the terms of the GNU General Public License as published by |
40 | the Free Software Foundation; either version 2 of the License, or |
41 | (at your option) any later version. |
42 | |
43 | This program is distributed in the hope that it will be useful, |
44 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
45 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
46 | GNU General Public License for more details. |
47 | |
48 | You should have received a copy of the GNU General Public License |
49 | along with this program; if not, write to the Free Software |
50 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
51 | |
52 | Richard Gooch may be reached by email at rgooch@atnf.csiro.au |
53 | The postal address is: |
54 | Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia. |
55 | */ |
56 | |
57 | #include "busybox.h" |
58 | #include "xregex.h" |
59 | #include <unistd.h> |
60 | #include <stdio.h> |
61 | #include <stdlib.h> |
62 | #include <stdarg.h> |
63 | #include <string.h> |
64 | #include <ctype.h> |
65 | #include <sys/stat.h> |
66 | #include <sys/types.h> |
67 | #include <sys/wait.h> |
68 | #include <sys/ioctl.h> |
69 | #include <sys/socket.h> |
70 | #include <sys/un.h> |
71 | #include <dirent.h> |
72 | #include <fcntl.h> |
73 | #include <syslog.h> |
74 | #include <signal.h> |
75 | #include <errno.h> |
76 | #include <sys/sysmacros.h> |
77 | |
78 | |
79 | /* Various defines taken from linux/major.h */ |
80 | #define IDE0_MAJOR 3 |
81 | #define IDE1_MAJOR 22 |
82 | #define IDE2_MAJOR 33 |
83 | #define IDE3_MAJOR 34 |
84 | #define IDE4_MAJOR 56 |
85 | #define IDE5_MAJOR 57 |
86 | #define IDE6_MAJOR 88 |
87 | #define IDE7_MAJOR 89 |
88 | #define IDE8_MAJOR 90 |
89 | #define IDE9_MAJOR 91 |
90 | |
91 | |
92 | /* Various defines taken from linux/devfs_fs.h */ |
93 | #define DEVFSD_PROTOCOL_REVISION_KERNEL 5 |
94 | #define DEVFSD_IOCTL_BASE 'd' |
95 | /* These are the various ioctls */ |
96 | #define DEVFSDIOC_GET_PROTO_REV _IOR(DEVFSD_IOCTL_BASE, 0, int) |
97 | #define DEVFSDIOC_SET_EVENT_MASK _IOW(DEVFSD_IOCTL_BASE, 2, int) |
98 | #define DEVFSDIOC_RELEASE_EVENT_QUEUE _IOW(DEVFSD_IOCTL_BASE, 3, int) |
99 | #define DEVFSDIOC_SET_CONFIG_DEBUG_MASK _IOW(DEVFSD_IOCTL_BASE, 4, int) |
100 | #define DEVFSD_NOTIFY_REGISTERED 0 |
101 | #define DEVFSD_NOTIFY_UNREGISTERED 1 |
102 | #define DEVFSD_NOTIFY_ASYNC_OPEN 2 |
103 | #define DEVFSD_NOTIFY_CLOSE 3 |
104 | #define DEVFSD_NOTIFY_LOOKUP 4 |
105 | #define DEVFSD_NOTIFY_CHANGE 5 |
106 | #define DEVFSD_NOTIFY_CREATE 6 |
107 | #define DEVFSD_NOTIFY_DELETE 7 |
108 | #define DEVFS_PATHLEN 1024 |
109 | /* Never change this otherwise the binary interface will change */ |
110 | |
111 | struct devfsd_notify_struct |
112 | { /* Use native C types to ensure same types in kernel and user space */ |
113 | unsigned int type; /* DEVFSD_NOTIFY_* value */ |
114 | unsigned int mode; /* Mode of the inode or device entry */ |
115 | unsigned int major; /* Major number of device entry */ |
116 | unsigned int minor; /* Minor number of device entry */ |
117 | unsigned int uid; /* Uid of process, inode or device entry */ |
118 | unsigned int gid; /* Gid of process, inode or device entry */ |
119 | unsigned int overrun_count; /* Number of lost events */ |
120 | unsigned int namelen; /* Number of characters not including '\0' */ |
121 | /* The device name MUST come last */ |
122 | char devname[DEVFS_PATHLEN]; /* This will be '\0' terminated */ |
123 | }; |
124 | |
125 | #define BUFFER_SIZE 16384 |
126 | #define DEVFSD_VERSION "1.3.25" |
127 | #define CONFIG_FILE "/etc/devfsd.conf" |
128 | #define MODPROBE "/sbin/modprobe" |
129 | #define MODPROBE_SWITCH_1 "-k" |
130 | #define MODPROBE_SWITCH_2 "-C" |
131 | #define CONFIG_MODULES_DEVFS "/etc/modules.devfs" |
132 | #define MAX_ARGS (6 + 1) |
133 | #define MAX_SUBEXPR 10 |
134 | #define STRING_LENGTH 255 |
135 | |
136 | /* for get_uid_gid() */ |
137 | #define UID 0 |
138 | #define GID 1 |
139 | |
140 | /* fork_and_execute() */ |
141 | # define DIE 1 |
142 | # define NO_DIE 0 |
143 | |
144 | /* for dir_operation() */ |
145 | #define RESTORE 0 |
146 | #define SERVICE 1 |
147 | #define READ_CONFIG 2 |
148 | |
149 | /* Update only after changing code to reflect new protocol */ |
150 | #define DEVFSD_PROTOCOL_REVISION_DAEMON 5 |
151 | |
152 | /* Compile-time check */ |
153 | #if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON |
154 | #error protocol version mismatch. Update your kernel headers |
155 | #endif |
156 | |
157 | #define AC_PERMISSIONS 0 |
158 | #define AC_MODLOAD 1 |
159 | #define AC_EXECUTE 2 |
160 | #define AC_MFUNCTION 3 /* not supported by busybox */ |
161 | #define AC_CFUNCTION 4 /* not supported by busybox */ |
162 | #define AC_COPY 5 |
163 | #define AC_IGNORE 6 |
164 | #define AC_MKOLDCOMPAT 7 |
165 | #define AC_MKNEWCOMPAT 8 |
166 | #define AC_RMOLDCOMPAT 9 |
167 | #define AC_RMNEWCOMPAT 10 |
168 | #define AC_RESTORE 11 |
169 | |
170 | struct permissions_type |
171 | { |
172 | mode_t mode; |
173 | uid_t uid; |
174 | gid_t gid; |
175 | }; |
176 | |
177 | struct execute_type |
178 | { |
179 | char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */ |
180 | }; |
181 | |
182 | struct copy_type |
183 | { |
184 | const char *source; |
185 | const char *destination; |
186 | }; |
187 | |
188 | struct action_type |
189 | { |
190 | unsigned int what; |
191 | unsigned int when; |
192 | }; |
193 | |
194 | struct config_entry_struct |
195 | { |
196 | struct action_type action; |
197 | regex_t preg; |
198 | union |
199 | { |
200 | struct permissions_type permissions; |
201 | struct execute_type execute; |
202 | struct copy_type copy; |
203 | } |
204 | u; |
205 | struct config_entry_struct *next; |
206 | }; |
207 | |
208 | struct get_variable_info |
209 | { |
210 | const struct devfsd_notify_struct *info; |
211 | const char *devname; |
212 | char devpath[STRING_LENGTH]; |
213 | }; |
214 | |
215 | static void dir_operation(int , const char * , int, unsigned long* ); |
216 | static void service(struct stat statbuf, char *path); |
217 | static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *); |
218 | static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned); |
219 | static int mksymlink (const char *oldpath, const char *newpath); |
220 | static void read_config_file (char *path, int optional, unsigned long *event_mask); |
221 | static void process_config_line (const char *, unsigned long *); |
222 | static int do_servicing (int, unsigned long); |
223 | static void service_name (const struct devfsd_notify_struct *); |
224 | static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *); |
225 | static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *, |
226 | const regmatch_t *, unsigned); |
227 | static void action_modload (const struct devfsd_notify_struct *info, const struct config_entry_struct *entry); |
228 | static void action_copy (const struct devfsd_notify_struct *, const struct config_entry_struct *, |
229 | const regmatch_t *, unsigned); |
230 | static void action_compat (const struct devfsd_notify_struct *, unsigned); |
231 | static void free_config (void); |
232 | static void restore(char *spath, struct stat source_stat, int rootlen); |
233 | static int copy_inode (const char *, const struct stat *, mode_t, const char *, const struct stat *); |
234 | static mode_t get_mode (const char *); |
235 | static void signal_handler (int); |
236 | static const char *get_variable (const char *, void *); |
237 | static int make_dir_tree (const char *); |
238 | static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *, |
239 | const char *, const regmatch_t *, unsigned ); |
240 | static void expand_regexp (char *, size_t, const char *, const char *, const regmatch_t *, unsigned ); |
241 | static const char *expand_variable( char *, unsigned, unsigned *, const char *, |
242 | const char *(*) (const char *, void *), void * ); |
243 | static const char *get_variable_v2(const char *, const char *(*) (const char *, void *), void *); |
244 | static char get_old_ide_name (unsigned , unsigned); |
245 | static char *write_old_sd_name (char *, unsigned, unsigned, char *); |
246 | |
247 | /* busybox functions */ |
248 | static void msg_logger(int pri, const char * fmt, ... )__attribute__ ((format (printf, 2, 3))); |
249 | static void msg_logger_and_die(int pri, const char * fmt, ... )__attribute__ ((noreturn, format (printf, 2, 3))); |
250 | static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag); |
251 | static void fork_and_execute(int die, char *arg0, char **arg ); |
252 | static int get_uid_gid ( int, const char *); |
253 | static void safe_memcpy( char * dest, const char * src, int len); |
254 | static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr); |
255 | static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr); |
256 | |
257 | /* Structs and vars */ |
258 | static struct config_entry_struct *first_config = NULL; |
259 | static struct config_entry_struct *last_config = NULL; |
260 | static const char *mount_point = NULL; |
261 | static volatile int caught_signal = FALSE; |
262 | static volatile int caught_sighup = FALSE; |
263 | static struct initial_symlink_struct |
264 | { |
265 | char *dest; |
266 | char *name; |
267 | } initial_symlinks[] = |
268 | { |
269 | {"/proc/self/fd", "fd"}, |
270 | {"fd/0", "stdin"}, |
271 | {"fd/1", "stdout"}, |
272 | {"fd/2", "stderr"}, |
273 | {NULL, NULL}, |
274 | }; |
275 | |
276 | static struct event_type |
277 | { |
278 | unsigned int type; /* The DEVFSD_NOTIFY_* value */ |
279 | const char *config_name; /* The name used in the config file */ |
280 | } event_types[] = |
281 | { |
282 | {DEVFSD_NOTIFY_REGISTERED, "REGISTER"}, |
283 | {DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"}, |
284 | {DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"}, |
285 | {DEVFSD_NOTIFY_CLOSE, "CLOSE"}, |
286 | {DEVFSD_NOTIFY_LOOKUP, "LOOKUP"}, |
287 | {DEVFSD_NOTIFY_CHANGE, "CHANGE"}, |
288 | {DEVFSD_NOTIFY_CREATE, "CREATE"}, |
289 | {DEVFSD_NOTIFY_DELETE, "DELETE"}, |
290 | {0xffffffff, NULL} |
291 | }; |
292 | |
293 | /* Busybox messages */ |
294 | |
295 | static const char * const bb_msg_proto_rev = "protocol revision"; |
296 | static const char * const bb_msg_bad_config = "bad %s config file: %s"; |
297 | static const char * const bb_msg_small_buffer = "buffer too small"; |
298 | static const char * const bb_msg_variable_not_found = "variable: %s not found"; |
299 | |
300 | /* Busybox functions */ |
301 | static void msg_logger(int pri, const char * fmt, ... ) |
302 | { |
303 | va_list ap; |
304 | int ret; |
305 | |
306 | va_start(ap, fmt); |
307 | ret = access ("/dev/log", F_OK); |
308 | if (ret == 0) { |
309 | openlog(applet_name, 0, LOG_DAEMON); |
310 | vsyslog( pri , fmt, ap); |
311 | /* Man: A trailing newline is added when needed. */ |
312 | closelog(); |
313 | } |
314 | /* ENABLE_DEVFSD_VERBOSE is always enabled if msg_logger is used */ |
315 | if ((ENABLE_DEVFSD_VERBOSE && ret) || ENABLE_DEBUG) { |
316 | bb_error_msg(fmt, ap); |
317 | } |
318 | va_end(ap); |
319 | } |
320 | |
321 | static void msg_logger_and_die(int pri, const char* fmt, ...) |
322 | { |
323 | va_list ap; |
324 | |
325 | va_start(ap, fmt); |
326 | msg_logger(pri, fmt, ap); |
327 | va_end(ap); |
328 | exit(EXIT_FAILURE); |
329 | } |
330 | |
331 | /* Busybox stuff */ |
332 | #if defined(CONFIG_DEVFSD_VERBOSE) || defined(CONFIG_DEBUG) |
333 | #define devfsd_error_msg(fmt, args...) bb_error_msg(fmt, ## args) |
334 | #define devfsd_perror_msg_and_die(fmt, args...) bb_perror_msg_and_die(fmt, ## args) |
335 | #define devfsd_error_msg_and_die(fmt, args...) bb_error_msg_and_die(fmt, ## args) |
336 | #if defined(CONFIG_DEBUG) |
337 | #define debug_msg_logger(x, fmt, args...) msg_logger(x, fmt, ## args) |
338 | #else |
339 | #define debug_msg_logger(x, fmt, args...) |
340 | #endif |
341 | #else |
342 | #define debug_msg_logger(x, fmt, args...) |
343 | #define msg_logger(p, fmt, args...) |
344 | #define msg_logger_and_die(p, fmt, args...) exit(1) |
345 | #define devfsd_perror_msg_and_die(fmt, args...) exit(1) |
346 | #define devfsd_error_msg_and_die(fmt, args...) exit(1) |
347 | #define devfsd_error_msg(fmt, args...) |
348 | #endif |
349 | |
350 | static void do_ioctl_and_die(int fd, int request, unsigned long event_mask_flag) |
351 | { |
352 | if (ioctl (fd, request, event_mask_flag) == -1) |
353 | msg_logger_and_die(LOG_ERR, "ioctl"); |
354 | } |
355 | |
356 | static void fork_and_execute(int die, char *arg0, char **arg ) |
357 | { |
358 | switch ( fork () ) |
359 | { |
360 | case 0: |
361 | /* Child */ |
362 | break; |
363 | case -1: |
364 | /* Parent: Error : die or return */ |
365 | msg_logger(LOG_ERR,(char *) bb_msg_memory_exhausted); |
366 | if(die) |
367 | exit(EXIT_FAILURE); |
368 | return; |
369 | default: |
370 | /* Parent : ok : return or exit */ |
371 | if(arg0 != NULL) |
372 | { |
373 | wait (NULL); |
374 | return; |
375 | } |
376 | exit (EXIT_SUCCESS); |
377 | } |
378 | /* Child : if arg0 != NULL do execvp */ |
379 | if(arg0 != NULL ) |
380 | { |
381 | execvp (arg0, arg); |
382 | msg_logger_and_die(LOG_ERR, "execvp"); |
383 | } |
384 | } |
385 | |
386 | static void safe_memcpy( char *dest, const char *src, int len) |
387 | { |
388 | memcpy (dest , src , len ); |
389 | dest[len] = '\0'; |
390 | } |
391 | |
392 | static unsigned int scan_dev_name_common(const char *d, unsigned int n, int addendum, char *ptr) |
393 | { |
394 | if(d[n - 4]=='d' && d[n - 3]=='i' && d[n - 2]=='s' && d[n - 1]=='c') |
395 | return 2 + addendum; |
396 | if(d[n - 2]=='c' && d[n - 1]=='d') |
397 | return 3 + addendum; |
398 | if(ptr[0]=='p' && ptr[1]=='a' && ptr[2]=='r' && ptr[3]=='t') |
399 | return 4 + addendum; |
400 | if(ptr[n - 2]=='m' && ptr[n - 1]=='t') |
401 | return 5 + addendum; |
402 | return 0; |
403 | } |
404 | |
405 | static unsigned int scan_dev_name(const char *d, unsigned int n, char *ptr) |
406 | { |
407 | if(d[0]=='s' && d[1]=='c' && d[2]=='s' && d[3]=='i' && d[4]=='/') { |
408 | if( d[n - 7]=='g' && d[n - 6]=='e' && d[n - 5]=='n' && |
409 | d[n - 4]=='e' && d[n - 3]=='r' && d[n - 2]=='i' && |
410 | d[n - 1]=='c' ) |
411 | return 1; |
412 | return scan_dev_name_common(d, n, 0, ptr); |
413 | } |
414 | if(d[0]=='i' && d[1]=='d' && d[2]=='e' && d[3]=='/' && |
415 | d[4]=='h' && d[5]=='o' && d[6]=='s' && d[7]=='t') |
416 | return scan_dev_name_common(d, n, 4, ptr); |
417 | if(d[0]=='s' && d[1]=='b' && d[2]=='p' && d[3]=='/') |
418 | return 10; |
419 | if(d[0]=='v' && d[1]=='c' && d[2]=='c' && d[3]=='/') |
420 | return 11; |
421 | if(d[0]=='p' && d[1]=='t' && d[2]=='y' && d[3]=='/') |
422 | return 12; |
423 | return 0; |
424 | } |
425 | |
426 | /* Public functions follow */ |
427 | |
428 | int devfsd_main (int argc, char **argv) |
429 | { |
430 | int print_version = FALSE; |
431 | int do_daemon = TRUE; |
432 | int no_polling = FALSE; |
433 | int do_scan; |
434 | int fd, proto_rev, count; |
435 | unsigned long event_mask = 0; |
436 | struct sigaction new_action; |
437 | struct initial_symlink_struct *curr; |
438 | |
439 | if (argc < 2) |
440 | bb_show_usage(); |
441 | |
442 | for (count = 2; count < argc; ++count) |
443 | { |
444 | if(argv[count][0] == '-') |
445 | { |
446 | if(argv[count][1]=='v' && !argv[count][2]) /* -v */ |
447 | print_version = TRUE; |
448 | else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='f' |
449 | && argv[count][2]=='g' && !argv[count][3]) /* -fg */ |
450 | do_daemon = FALSE; |
451 | else if(ENABLE_DEVFSD_FG_NP && argv[count][1]=='n' |
452 | && argv[count][2]=='p' && !argv[count][3]) /* -np */ |
453 | no_polling = TRUE; |
454 | else |
455 | bb_show_usage(); |
456 | } |
457 | } |
458 | |
459 | /* strip last / from mount point, so we don't need to check for it later */ |
460 | while (argv[1][1]!='\0' && argv[1][strlen(argv[1])-1] == '/' ) |
461 | argv[1][strlen(argv[1]) -1] = '\0'; |
462 | |
463 | mount_point = argv[1]; |
464 | |
465 | if (chdir (mount_point) != 0) |
466 | devfsd_perror_msg_and_die(mount_point); |
467 | |
468 | fd = xopen (".devfsd", O_RDONLY); |
469 | |
470 | if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0) |
471 | devfsd_perror_msg_and_die("FD_CLOEXEC"); |
472 | |
473 | if (ioctl (fd, DEVFSDIOC_GET_PROTO_REV, &proto_rev) == -1) |
474 | msg_logger_and_die(LOG_ERR, "ioctl"); |
475 | |
476 | /*setup initial entries */ |
477 | for (curr = initial_symlinks; curr->dest != NULL; ++curr) |
478 | symlink (curr->dest, curr->name); |
479 | |
480 | /* NB: The check for CONFIG_FILE is done in read_config_file() */ |
481 | |
482 | if ( print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) ) |
483 | { |
484 | printf( "%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n", |
485 | applet_name,DEVFSD_VERSION,bb_msg_proto_rev, |
486 | DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev); |
487 | if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) |
488 | bb_error_msg_and_die( "%s mismatch!",bb_msg_proto_rev); |
489 | exit(EXIT_SUCCESS); /* -v */ |
490 | } |
491 | /* Tell kernel we are special (i.e. we get to see hidden entries) */ |
492 | do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, 0); |
493 | |
494 | sigemptyset (&new_action.sa_mask); |
495 | new_action.sa_flags = 0; |
496 | |
497 | /* Set up SIGHUP and SIGUSR1 handlers */ |
498 | new_action.sa_handler = signal_handler; |
499 | if (sigaction (SIGHUP, &new_action, NULL) != 0 || sigaction (SIGUSR1, &new_action, NULL) != 0 ) |
500 | devfsd_error_msg_and_die( "sigaction"); |
501 | |
502 | printf("%s v%s started for %s\n",applet_name, DEVFSD_VERSION, mount_point); |
503 | |
504 | /* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */ |
505 | umask (0); |
506 | read_config_file (CONFIG_FILE, FALSE, &event_mask); |
507 | /* Do the scan before forking, so that boot scripts see the finished product */ |
508 | dir_operation(SERVICE,mount_point,0,NULL); |
509 | |
510 | if (ENABLE_DEVFSD_FG_NP && no_polling) |
511 | exit (0); |
512 | if (do_daemon) |
513 | { |
514 | /* Release so that the child can grab it */ |
515 | do_ioctl_and_die(fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0); |
516 | fork_and_execute(DIE, NULL, NULL); |
517 | setsid (); /* Prevent hangups and become pgrp leader */ |
518 | } else if(ENABLE_DEVFSD_FG_NP) { |
519 | setpgid (0, 0); /* Become process group leader */ |
520 | } |
521 | |
522 | while (TRUE) |
523 | { |
524 | do_scan = do_servicing (fd, event_mask); |
525 | |
526 | free_config (); |
527 | read_config_file (CONFIG_FILE, FALSE, &event_mask); |
528 | if (do_scan) |
529 | dir_operation(SERVICE,mount_point,0,NULL); |
530 | } |
531 | } /* End Function main */ |
532 | |
533 | |
534 | /* Private functions follow */ |
535 | |
536 | static void read_config_file (char *path, int optional, unsigned long *event_mask) |
537 | /* [SUMMARY] Read a configuration database. |
538 | <path> The path to read the database from. If this is a directory, all |
539 | entries in that directory will be read (except hidden entries). |
540 | <optional> If TRUE, the routine will silently ignore a missing config file. |
541 | <event_mask> The event mask is written here. This is not initialised. |
542 | [RETURNS] Nothing. |
543 | */ |
544 | { |
545 | struct stat statbuf; |
546 | FILE *fp; |
547 | char buf[STRING_LENGTH]; |
548 | char *line=NULL; |
549 | |
550 | debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, path); |
551 | |
552 | if (stat (path, &statbuf) == 0 ) |
553 | { |
554 | /* Don't read 0 length files: ignored */ |
555 | /*if( statbuf.st_size == 0 ) |
556 | return;*/ |
557 | if ( S_ISDIR (statbuf.st_mode) ) |
558 | { |
559 | /* strip last / from dirname so we don't need to check for it later */ |
560 | while (path && path[1]!='\0' && path[strlen(path)-1] == '/') |
561 | path[strlen(path) -1] = '\0'; |
562 | |
563 | dir_operation(READ_CONFIG, path, 0, event_mask); |
564 | return; |
565 | } |
566 | if ( ( fp = fopen (path, "r") ) != NULL ) |
567 | { |
568 | while (fgets (buf, STRING_LENGTH, fp) != NULL) |
569 | { |
570 | /* Skip whitespace */ |
571 | for (line = buf; isspace (*line); ++line) |
572 | /*VOID*/; |
573 | if (line[0] == '\0' || line[0] == '#' ) |
574 | continue; |
575 | process_config_line (line, event_mask); |
576 | } |
577 | fclose (fp); |
578 | } else { |
579 | goto read_config_file_err; |
580 | } |
581 | } else { |
582 | read_config_file_err: |
583 | if(optional == 0 && errno == ENOENT) |
584 | msg_logger_and_die(LOG_ERR, "read config file: %s: %m", path); |
585 | } |
586 | return; |
587 | } /* End Function read_config_file */ |
588 | |
589 | static void process_config_line (const char *line, unsigned long *event_mask) |
590 | /* [SUMMARY] Process a line from a configuration file. |
591 | <line> The configuration line. |
592 | <event_mask> The event mask is written here. This is not initialised. |
593 | [RETURNS] Nothing. |
594 | */ |
595 | { |
596 | int num_args, count; |
597 | struct config_entry_struct *new; |
598 | char p[MAX_ARGS][STRING_LENGTH]; |
599 | char when[STRING_LENGTH], what[STRING_LENGTH]; |
600 | char name[STRING_LENGTH]; |
601 | char * msg=""; |
602 | char *ptr; |
603 | int i; |
604 | |
605 | /* !!!! Only Uppercase Keywords in devsfd.conf */ |
606 | static const char *const options[] = { |
607 | "CLEAR_CONFIG", "INCLUDE", "OPTIONAL_INCLUDE", |
608 | "RESTORE", "PERMISSIONS", "MODLOAD", "EXECUTE", |
609 | "COPY", "IGNORE", "MKOLDCOMPAT", "MKNEWCOMPAT", |
610 | "RMOLDCOMPAT", "RMNEWCOMPAT", 0 |
611 | }; |
612 | |
613 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
614 | |
615 | for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0'; |
616 | num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s", |
617 | when, name, what, |
618 | p[0], p[1], p[2], p[3], p[4], p[5], p[6]); |
619 | |
620 | i = index_in_str_array(options, when ); |
621 | |
622 | /*"CLEAR_CONFIG"*/ |
623 | if( i == 0) |
624 | { |
625 | free_config (); |
626 | *event_mask = 0; |
627 | return; |
628 | } |
629 | |
630 | if ( num_args < 2) |
631 | goto process_config_line_err; |
632 | |
633 | /* "INCLUDE" & "OPTIONAL_INCLUDE" */ |
634 | if( i == 1 || i == 2 ) |
635 | { |
636 | st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL ); |
637 | msg_logger(LOG_INFO, "%sinclude: %s",(toupper (when[0]) == 'I') ? "": "optional_", name); |
638 | read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask); |
639 | return; |
640 | } |
641 | /* "RESTORE" */ |
642 | if( i == 3) |
643 | { |
644 | dir_operation(RESTORE,name, strlen (name),NULL); |
645 | return; |
646 | } |
647 | if (num_args < 3) |
648 | goto process_config_line_err; |
649 | |
650 | new = xmalloc (sizeof *new); |
651 | memset (new, 0, sizeof *new); |
652 | |
653 | for (count = 0; event_types[count].config_name != NULL; ++count) |
654 | { |
655 | if (strcasecmp (when, event_types[count].config_name) != 0) |
656 | continue; |
657 | new->action.when = event_types[count].type; |
658 | break; |
659 | } |
660 | if (event_types[count].config_name == NULL) |
661 | { |
662 | msg="WHEN in"; |
663 | goto process_config_line_err; |
664 | } |
665 | |
666 | i = index_in_str_array(options, what ); |
667 | |
668 | switch (i) |
669 | { |
670 | case 4: /* "PERMISSIONS" */ |
671 | new->action.what = AC_PERMISSIONS; |
672 | /* Get user and group */ |
673 | if ( ( ptr = strchr (p[0], '.') ) == NULL ) |
674 | { |
675 | msg="UID.GID"; |
676 | goto process_config_line_err; /*"missing '.' in UID.GID"*/ |
677 | } |
678 | |
679 | *ptr++ = '\0'; |
680 | new->u.permissions.uid = get_uid_gid (UID, p[0]); |
681 | new->u.permissions.gid = get_uid_gid (GID, ptr); |
682 | /* Get mode */ |
683 | new->u.permissions.mode = get_mode (p[1]); |
684 | break; |
685 | case 5: /* MODLOAD */ |
686 | /*This action will pass "/dev/$devname" (i.e. "/dev/" prefixed to |
687 | the device name) to the module loading facility. In addition, |
688 | the /etc/modules.devfs configuration file is used.*/ |
689 | if (ENABLE_DEVFSD_MODLOAD) |
690 | new->action.what = AC_MODLOAD; |
691 | break; |
692 | case 6: /* EXECUTE */ |
693 | new->action.what = AC_EXECUTE; |
694 | num_args -= 3; |
695 | |
696 | for (count = 0; count < num_args; ++count) |
697 | new->u.execute.argv[count] = xstrdup (p[count]); |
698 | |
699 | new->u.execute.argv[num_args] = NULL; |
700 | break; |
701 | case 7: /* COPY */ |
702 | new->action.what = AC_COPY; |
703 | num_args -= 3; |
704 | if (num_args != 2) |
705 | goto process_config_line_err; /* missing path and function in line */ |
706 | |
707 | new->u.copy.source = xstrdup (p[0]); |
708 | new->u.copy.destination = xstrdup (p[1]); |
709 | break; |
710 | case 8: /* IGNORE */ |
711 | /* FALLTROUGH */ |
712 | case 9: /* MKOLDCOMPAT */ |
713 | /* FALLTROUGH */ |
714 | case 10: /* MKNEWCOMPAT */ |
715 | /* FALLTROUGH */ |
716 | case 11:/* RMOLDCOMPAT */ |
717 | /* FALLTROUGH */ |
718 | case 12: /* RMNEWCOMPAT */ |
719 | /* AC_IGNORE 6 |
720 | AC_MKOLDCOMPAT 7 |
721 | AC_MKNEWCOMPAT 8 |
722 | AC_RMOLDCOMPAT 9 |
723 | AC_RMNEWCOMPAT 10*/ |
724 | new->action.what = i - 2; |
725 | break; |
726 | default: |
727 | msg ="WHAT in"; |
728 | goto process_config_line_err; |
729 | /*esac*/ |
730 | } /* switch (i) */ |
731 | |
732 | xregcomp( &new->preg, name, REG_EXTENDED); |
733 | |
734 | *event_mask |= 1 << new->action.when; |
735 | new->next = NULL; |
736 | if (first_config == NULL) |
737 | first_config = new; |
738 | else |
739 | last_config->next = new; |
740 | last_config = new; |
741 | return; |
742 | process_config_line_err: |
743 | msg_logger_and_die(LOG_ERR, bb_msg_bad_config, msg , line); |
744 | } /* End Function process_config_line */ |
745 | |
746 | static int do_servicing (int fd, unsigned long event_mask) |
747 | /* [SUMMARY] Service devfs changes until a signal is received. |
748 | <fd> The open control file. |
749 | <event_mask> The event mask. |
750 | [RETURNS] TRUE if SIGHUP was caught, else FALSE. |
751 | */ |
752 | { |
753 | ssize_t bytes; |
754 | struct devfsd_notify_struct info; |
755 | unsigned long tmp_event_mask; |
756 | |
757 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
758 | |
759 | /* Tell devfs what events we care about */ |
760 | tmp_event_mask = event_mask; |
761 | do_ioctl_and_die(fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask); |
762 | while (!caught_signal) |
763 | { |
764 | errno = 0; |
765 | bytes = read (fd, (char *) &info, sizeof info); |
766 | if (caught_signal) |
767 | break; /* Must test for this first */ |
768 | if (errno == EINTR) |
769 | continue; /* Yes, the order is important */ |
770 | if (bytes < 1) |
771 | break; |
772 | service_name (&info); |
773 | } |
774 | if (caught_signal) |
775 | { |
776 | int c_sighup = caught_sighup; |
777 | |
778 | caught_signal = FALSE; |
779 | caught_sighup = FALSE; |
780 | return c_sighup; |
781 | } |
782 | msg_logger_and_die(LOG_ERR, "read error on control file"); |
783 | } /* End Function do_servicing */ |
784 | |
785 | static void service_name (const struct devfsd_notify_struct *info) |
786 | /* [SUMMARY] Service a single devfs change. |
787 | <info> The devfs change. |
788 | [RETURNS] Nothing. |
789 | */ |
790 | { |
791 | unsigned int n; |
792 | regmatch_t mbuf[MAX_SUBEXPR]; |
793 | struct config_entry_struct *entry; |
794 | |
795 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
796 | if (ENABLE_DEBUG && info->overrun_count > 0) |
797 | debug_msg_logger(LOG_ERR, "lost %u events", info->overrun_count); |
798 | |
799 | /* Discard lookups on "/dev/log" and "/dev/initctl" */ |
800 | if( info->type == DEVFSD_NOTIFY_LOOKUP && |
801 | ((info->devname[0]=='l' && info->devname[1]=='o' && |
802 | info->devname[2]=='g' && !info->devname[3]) || |
803 | ( info->devname[0]=='i' && info->devname[1]=='n' && |
804 | info->devname[2]=='i' && info->devname[3]=='t' && |
805 | info->devname[4]=='c' && info->devname[5]=='t' && |
806 | info->devname[6]=='l' && !info->devname[7]))) |
807 | return; |
808 | for (entry = first_config; entry != NULL; entry = entry->next) |
809 | { |
810 | /* First check if action matches the type, then check if name matches */ |
811 | if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 ) |
812 | continue; |
813 | for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n) |
814 | /* VOID */; |
815 | |
816 | debug_msg_logger(LOG_INFO, "%s: action.what %d", __FUNCTION__, entry->action.what); |
817 | |
818 | switch (entry->action.what) |
819 | { |
820 | case AC_PERMISSIONS: |
821 | action_permissions (info, entry); |
822 | break; |
823 | case AC_MODLOAD: |
824 | if(ENABLE_DEVFSD_MODLOAD) |
825 | action_modload (info, entry); |
826 | break; |
827 | case AC_EXECUTE: |
828 | action_execute (info, entry, mbuf, n); |
829 | break; |
830 | case AC_COPY: |
831 | action_copy (info, entry, mbuf, n); |
832 | break; |
833 | case AC_IGNORE: |
834 | return; |
835 | /*break;*/ |
836 | case AC_MKOLDCOMPAT: |
837 | case AC_MKNEWCOMPAT: |
838 | case AC_RMOLDCOMPAT: |
839 | case AC_RMNEWCOMPAT: |
840 | action_compat (info, entry->action.what); |
841 | break; |
842 | default: |
843 | msg_logger_and_die(LOG_ERR, "Unknown action"); |
844 | } |
845 | } |
846 | } /* End Function service_name */ |
847 | |
848 | static void action_permissions (const struct devfsd_notify_struct *info, |
849 | const struct config_entry_struct *entry) |
850 | /* [SUMMARY] Update permissions for a device entry. |
851 | <info> The devfs change. |
852 | <entry> The config file entry. |
853 | [RETURNS] Nothing. |
854 | */ |
855 | { |
856 | struct stat statbuf; |
857 | |
858 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
859 | |
860 | if ( stat (info->devname, &statbuf) != 0 || |
861 | chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 || |
862 | chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0) |
863 | { |
864 | msg_logger(LOG_ERR, "Can't chmod or chown: %s: %m",info->devname); |
865 | } |
866 | } /* End Function action_permissions */ |
867 | |
868 | static void action_modload (const struct devfsd_notify_struct *info, |
869 | const struct config_entry_struct *entry ATTRIBUTE_UNUSED) |
870 | /* [SUMMARY] Load a module. |
871 | <info> The devfs change. |
872 | <entry> The config file entry. |
873 | [RETURNS] Nothing. |
874 | */ |
875 | { |
876 | char *argv[6]; |
877 | char device[STRING_LENGTH]; |
878 | |
879 | argv[0] = MODPROBE; |
880 | argv[1] = MODPROBE_SWITCH_1; /* "-k" */ |
881 | argv[2] = MODPROBE_SWITCH_2; /* "-C" */ |
882 | argv[3] = CONFIG_MODULES_DEVFS; |
883 | argv[4] = device; |
884 | argv[5] = NULL; |
885 | |
886 | snprintf (device, sizeof (device), "/dev/%s", info->devname); |
887 | debug_msg_logger(LOG_INFO, "%s: %s %s %s %s %s",__FUNCTION__, argv[0],argv[1],argv[2],argv[3],argv[4]); |
888 | fork_and_execute(DIE, argv[0], argv); |
889 | } /* End Function action_modload */ |
890 | |
891 | static void action_execute (const struct devfsd_notify_struct *info, |
892 | const struct config_entry_struct *entry, |
893 | const regmatch_t *regexpr, unsigned int numexpr) |
894 | /* [SUMMARY] Execute a programme. |
895 | <info> The devfs change. |
896 | <entry> The config file entry. |
897 | <regexpr> The number of subexpression (start, end) offsets within the |
898 | device name. |
899 | <numexpr> The number of elements within <<regexpr>>. |
900 | [RETURNS] Nothing. |
901 | */ |
902 | { |
903 | unsigned int count; |
904 | struct get_variable_info gv_info; |
905 | char *argv[MAX_ARGS + 1]; |
906 | char largv[MAX_ARGS + 1][STRING_LENGTH]; |
907 | |
908 | debug_msg_logger(LOG_INFO ,__FUNCTION__); |
909 | gv_info.info = info; |
910 | gv_info.devname = info->devname; |
911 | snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname); |
912 | for (count = 0; entry->u.execute.argv[count] != NULL; ++count) |
913 | { |
914 | expand_expression (largv[count], STRING_LENGTH, |
915 | entry->u.execute.argv[count], |
916 | get_variable, &gv_info, |
917 | gv_info.devname, regexpr, numexpr ); |
918 | argv[count] = largv[count]; |
919 | } |
920 | argv[count] = NULL; |
921 | fork_and_execute(NO_DIE, argv[0], argv); |
922 | } /* End Function action_execute */ |
923 | |
924 | |
925 | static void action_copy (const struct devfsd_notify_struct *info, |
926 | const struct config_entry_struct *entry, |
927 | const regmatch_t *regexpr, unsigned int numexpr) |
928 | /* [SUMMARY] Copy permissions. |
929 | <info> The devfs change. |
930 | <entry> The config file entry. |
931 | <regexpr> This list of subexpression (start, end) offsets within the |
932 | device name. |
933 | <numexpr> The number of elements in <<regexpr>>. |
934 | [RETURNS] Nothing. |
935 | */ |
936 | { |
937 | mode_t new_mode; |
938 | struct get_variable_info gv_info; |
939 | struct stat source_stat, dest_stat; |
940 | char source[STRING_LENGTH], destination[STRING_LENGTH]; |
941 | int ret = 0; |
942 | |
943 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
944 | |
945 | dest_stat.st_mode = 0; |
946 | |
947 | if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) ) |
948 | return; |
949 | gv_info.info = info; |
950 | gv_info.devname = info->devname; |
951 | |
952 | snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname); |
953 | expand_expression (source, STRING_LENGTH, entry->u.copy.source, |
954 | get_variable, &gv_info, gv_info.devname, |
955 | regexpr, numexpr); |
956 | |
957 | expand_expression (destination, STRING_LENGTH, entry->u.copy.destination, |
958 | get_variable, &gv_info, gv_info.devname, |
959 | regexpr, numexpr); |
960 | |
961 | if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0) |
962 | return; |
963 | lstat (destination, &dest_stat); |
964 | new_mode = source_stat.st_mode & ~S_ISVTX; |
965 | if (info->type == DEVFSD_NOTIFY_CREATE) |
966 | new_mode |= S_ISVTX; |
967 | else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) ) |
968 | new_mode |= S_ISVTX; |
969 | ret = copy_inode (destination, &dest_stat, new_mode, source, &source_stat); |
970 | if (ENABLE_DEBUG && ret && (errno != EEXIST)) |
971 | debug_msg_logger(LOG_ERR, "copy_inode: %s to %s: %m", source, destination); |
972 | return; |
973 | } /* End Function action_copy */ |
974 | |
975 | static void action_compat (const struct devfsd_notify_struct *info, unsigned int action) |
976 | /* [SUMMARY] Process a compatibility request. |
977 | <info> The devfs change. |
978 | <action> The action to take. |
979 | [RETURNS] Nothing. |
980 | */ |
981 | { |
982 | int ret; |
983 | const char *compat_name = NULL; |
984 | const char *dest_name = info->devname; |
985 | char *ptr=NULL; |
986 | char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH]; |
987 | int mode, host, bus, target, lun; |
988 | unsigned int i; |
989 | char rewind_; |
990 | /* 1 to 5 "scsi/" , 6 to 9 "ide/host" */ |
991 | static const char *const fmt[] = { |
992 | NULL , |
993 | "sg/c%db%dt%du%d", /* scsi/generic */ |
994 | "sd/c%db%dt%du%d", /* scsi/disc */ |
995 | "sr/c%db%dt%du%d", /* scsi/cd */ |
996 | "sd/c%db%dt%du%dp%d", /* scsi/part */ |
997 | "st/c%db%dt%du%dm%d%c", /* scsi/mt */ |
998 | "ide/hd/c%db%dt%du%d", /* ide/host/disc */ |
999 | "ide/cd/c%db%dt%du%d", /* ide/host/cd */ |
1000 | "ide/hd/c%db%dt%du%dp%d", /* ide/host/part */ |
1001 | "ide/mt/c%db%dt%du%d%s", /* ide/host/mt */ |
1002 | NULL |
1003 | }; |
1004 | |
1005 | /* First construct compatibility name */ |
1006 | switch (action) |
1007 | { |
1008 | case AC_MKOLDCOMPAT: |
1009 | case AC_RMOLDCOMPAT: |
1010 | compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor); |
1011 | break; |
1012 | case AC_MKNEWCOMPAT: |
1013 | case AC_RMNEWCOMPAT: |
1014 | ptr = strrchr (info->devname, '/') + 1; |
1015 | i=scan_dev_name(info->devname, info->namelen, ptr); |
1016 | |
1017 | debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i); |
1018 | |
1019 | /* nothing found */ |
1020 | if(i==0 || i > 9) |
1021 | return; |
1022 | |
1023 | sscanf (info->devname +((i<6)?5:4), "host%d/bus%d/target%d/lun%d/", &host, &bus, &target, &lun); |
1024 | snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + ((i>5)?4:0)); |
1025 | dest_name = dest_buf; |
1026 | compat_name = compat_buf; |
1027 | |
1028 | |
1029 | /* 1 == scsi/generic 2 == scsi/disc 3 == scsi/cd 6 == ide/host/disc 7 == ide/host/cd */ |
1030 | if( i == 1 || i == 2 || i == 3 || i == 6 || i ==7 ) |
1031 | sprintf ( compat_buf, fmt[i], host, bus, target, lun); |
1032 | |
1033 | /* 4 == scsi/part 8 == ide/host/part */ |
1034 | if( i == 4 || i == 8) |
1035 | sprintf ( compat_buf, fmt[i], host, bus, target, lun, atoi (ptr + 4) ); |
1036 | |
1037 | /* 5 == scsi/mt */ |
1038 | if( i == 5) |
1039 | { |
1040 | rewind_ = info->devname[info->namelen - 1]; |
1041 | if (rewind_ != 'n') |
1042 | rewind_ = '\0'; |
1043 | mode=0; |
1044 | if(ptr[2] == 'l' /*108*/ || ptr[2] == 'm'/*109*/) |
1045 | mode = ptr[2] - 107; /* 1 or 2 */ |
1046 | if(ptr[2] == 'a') |
1047 | mode = 3; |
1048 | sprintf (compat_buf, fmt [i], host, bus, target, lun, mode, rewind_); |
1049 | } |
1050 | |
1051 | /* 9 == ide/host/mt */ |
1052 | if( i == 9 ) |
1053 | snprintf (compat_buf, sizeof (compat_buf), fmt[i], host, bus, target, lun, ptr + 2); |
1054 | /* esac */ |
1055 | } /* switch (action) */ |
1056 | |
1057 | if(compat_name == NULL ) |
1058 | return; |
1059 | |
1060 | debug_msg_logger( LOG_INFO, "%s: %s", __FUNCTION__, compat_name); |
1061 | |
1062 | /* Now decide what to do with it */ |
1063 | switch (action) |
1064 | { |
1065 | case AC_MKOLDCOMPAT: |
1066 | case AC_MKNEWCOMPAT: |
1067 | mksymlink (dest_name, compat_name); |
1068 | break; |
1069 | case AC_RMOLDCOMPAT: |
1070 | case AC_RMNEWCOMPAT: |
1071 | ret = unlink (compat_name); |
1072 | if (ENABLE_DEBUG && ret) |
1073 | debug_msg_logger(LOG_ERR, "unlink: %s: %m", compat_name); |
1074 | break; |
1075 | /*esac*/ |
1076 | } /* switch (action) */ |
1077 | } /* End Function action_compat */ |
1078 | |
1079 | static void restore(char *spath, struct stat source_stat, int rootlen) |
1080 | { |
1081 | char dpath[STRING_LENGTH]; |
1082 | struct stat dest_stat; |
1083 | |
1084 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1085 | |
1086 | dest_stat.st_mode = 0; |
1087 | snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen); |
1088 | lstat (dpath, &dest_stat); |
1089 | |
1090 | if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) ) |
1091 | copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat); |
1092 | |
1093 | if ( S_ISDIR (source_stat.st_mode) ) |
1094 | dir_operation(RESTORE, spath, rootlen,NULL); |
1095 | } |
1096 | |
1097 | |
1098 | static int copy_inode (const char *destpath, const struct stat *dest_stat, |
1099 | mode_t new_mode, |
1100 | const char *sourcepath, const struct stat *source_stat) |
1101 | /* [SUMMARY] Copy an inode. |
1102 | <destpath> The destination path. An existing inode may be deleted. |
1103 | <dest_stat> The destination stat(2) information. |
1104 | <new_mode> The desired new mode for the destination. |
1105 | <sourcepath> The source path. |
1106 | <source_stat> The source stat(2) information. |
1107 | [RETURNS] TRUE on success, else FALSE. |
1108 | */ |
1109 | { |
1110 | int source_len, dest_len; |
1111 | char source_link[STRING_LENGTH], dest_link[STRING_LENGTH]; |
1112 | int fd, val; |
1113 | struct sockaddr_un un_addr; |
1114 | char symlink_val[STRING_LENGTH]; |
1115 | |
1116 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1117 | |
1118 | if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) ) |
1119 | { |
1120 | /* Same type */ |
1121 | if ( S_ISLNK (source_stat->st_mode) ) |
1122 | { |
1123 | if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 || |
1124 | ( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 ) |
1125 | return FALSE; |
1126 | source_link[source_len] = '\0'; |
1127 | dest_link[dest_len] = '\0'; |
1128 | if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) ) |
1129 | { |
1130 | unlink (destpath); |
1131 | symlink (source_link, destpath); |
1132 | } |
1133 | return TRUE; |
1134 | } /* Else not a symlink */ |
1135 | chmod (destpath, new_mode & ~S_IFMT); |
1136 | chown (destpath, source_stat->st_uid, source_stat->st_gid); |
1137 | return TRUE; |
1138 | } |
1139 | /* Different types: unlink and create */ |
1140 | unlink (destpath); |
1141 | switch (source_stat->st_mode & S_IFMT) |
1142 | { |
1143 | case S_IFSOCK: |
1144 | if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 ) |
1145 | break; |
1146 | un_addr.sun_family = AF_UNIX; |
1147 | snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath); |
1148 | val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr); |
1149 | close (fd); |
1150 | if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0) |
1151 | break; |
1152 | goto do_chown; |
1153 | case S_IFLNK: |
1154 | if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 ) |
1155 | break; |
1156 | symlink_val[val] = '\0'; |
1157 | if (symlink (symlink_val, destpath) == 0) |
1158 | return TRUE; |
1159 | break; |
1160 | case S_IFREG: |
1161 | if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 ) |
1162 | break; |
1163 | close (fd); |
1164 | if (chmod (destpath, new_mode & ~S_IFMT) != 0) |
1165 | break; |
1166 | goto do_chown; |
1167 | case S_IFBLK: |
1168 | case S_IFCHR: |
1169 | case S_IFIFO: |
1170 | if (mknod (destpath, new_mode, source_stat->st_rdev) != 0) |
1171 | break; |
1172 | goto do_chown; |
1173 | case S_IFDIR: |
1174 | if (mkdir (destpath, new_mode & ~S_IFMT) != 0) |
1175 | break; |
1176 | do_chown: |
1177 | if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0) |
1178 | return TRUE; |
1179 | /*break;*/ |
1180 | } |
1181 | return FALSE; |
1182 | } /* End Function copy_inode */ |
1183 | |
1184 | static void free_config (void) |
1185 | /* [SUMMARY] Free the configuration information. |
1186 | [RETURNS] Nothing. |
1187 | */ |
1188 | { |
1189 | struct config_entry_struct *c_entry; |
1190 | void *next; |
1191 | |
1192 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1193 | |
1194 | for (c_entry = first_config; c_entry != NULL; c_entry = next) |
1195 | { |
1196 | unsigned int count; |
1197 | |
1198 | next = c_entry->next; |
1199 | regfree (&c_entry->preg); |
1200 | if (c_entry->action.what == AC_EXECUTE) |
1201 | { |
1202 | for (count = 0; count < MAX_ARGS; ++count) |
1203 | { |
1204 | if (c_entry->u.execute.argv[count] == NULL) |
1205 | break; |
1206 | free (c_entry->u.execute.argv[count]); |
1207 | } |
1208 | } |
1209 | free (c_entry); |
1210 | } |
1211 | first_config = NULL; |
1212 | last_config = NULL; |
1213 | } /* End Function free_config */ |
1214 | |
1215 | static int get_uid_gid (int flag, const char *string) |
1216 | /* [SUMMARY] Convert a string to a UID or GID value. |
1217 | <flag> "UID" or "GID". |
1218 | <string> The string. |
1219 | [RETURNS] The UID or GID value. |
1220 | */ |
1221 | { |
1222 | struct passwd *pw_ent; |
1223 | struct group *grp_ent; |
1224 | static char *msg; |
1225 | |
1226 | if (ENABLE_DEVFSD_VERBOSE) |
1227 | msg="user"; |
1228 | |
1229 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1230 | |
1231 | if(ENABLE_DEBUG && flag != UID && flag != GID) |
1232 | msg_logger_and_die(LOG_ERR,"%s: flag != UID && flag != GID", __FUNCTION__); |
1233 | |
1234 | if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) ) |
1235 | return atoi(string); |
1236 | |
1237 | if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL ) |
1238 | return pw_ent->pw_uid; |
1239 | |
1240 | if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL ) |
1241 | return grp_ent->gr_gid; |
1242 | else if(ENABLE_DEVFSD_VERBOSE) |
1243 | msg="group"; |
1244 | |
1245 | if(ENABLE_DEVFSD_VERBOSE) |
1246 | msg_logger(LOG_ERR,"unknown %s: %s, defaulting to %cid=0", msg, string, msg[0]); |
1247 | return 0; |
1248 | }/* End Function get_uid_gid */ |
1249 | |
1250 | static mode_t get_mode (const char *string) |
1251 | /* [SUMMARY] Convert a string to a mode value. |
1252 | <string> The string. |
1253 | [RETURNS] The mode value. |
1254 | */ |
1255 | { |
1256 | mode_t mode; |
1257 | int i; |
1258 | |
1259 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1260 | |
1261 | if ( isdigit (string[0]) ) |
1262 | return strtoul(string, NULL, 8); |
1263 | if (strlen (string) != 9) |
1264 | msg_logger_and_die(LOG_ERR, "bad mode: %s", string); |
1265 | |
1266 | mode = 0; |
1267 | i= S_IRUSR; |
1268 | while (i>0) |
1269 | { |
1270 | if(string[0]=='r'||string[0]=='w'||string[0]=='x') |
1271 | mode+=i; |
1272 | i=i/2; |
1273 | string++; |
1274 | } |
1275 | return mode; |
1276 | } /* End Function get_mode */ |
1277 | |
1278 | static void signal_handler (int sig) |
1279 | { |
1280 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1281 | |
1282 | caught_signal = TRUE; |
1283 | if (sig == SIGHUP) |
1284 | caught_sighup = TRUE; |
1285 | |
1286 | msg_logger(LOG_INFO, "Caught signal %d", sig); |
1287 | } /* End Function signal_handler */ |
1288 | |
1289 | static const char *get_variable (const char *variable, void *info) |
1290 | { |
1291 | struct get_variable_info *gv_info = info; |
1292 | static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH]; |
1293 | const char *field_names[] = { "hostname", "mntpt", "devpath", "devname", |
1294 | "uid", "gid", "mode", hostname, mount_point, |
1295 | gv_info->devpath, gv_info->devname, 0 }; |
1296 | int i; |
1297 | |
1298 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1299 | |
1300 | if (gethostname (hostname, STRING_LENGTH - 1) != 0) |
1301 | msg_logger_and_die(LOG_ERR, "gethostname: %m"); |
1302 | |
1303 | /* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */ |
1304 | hostname[STRING_LENGTH - 1] = '\0'; |
1305 | |
1306 | /* index_in_str_array returns i>=0 */ |
1307 | i=index_in_str_array(field_names, variable); |
1308 | |
1309 | if ( i > 6 || i < 0 || (i > 1 && gv_info == NULL)) |
1310 | return NULL; |
1311 | if( i >= 0 && i <= 3) |
1312 | { |
1313 | debug_msg_logger(LOG_INFO, "%s: i=%d %s", __FUNCTION__, i ,field_names[i+7]); |
1314 | return field_names[i+7]; |
1315 | } |
1316 | |
1317 | if(i == 4 ) |
1318 | sprintf (sbuf, "%u", gv_info->info->uid); |
1319 | else if(i == 5) |
1320 | sprintf (sbuf, "%u", gv_info->info->gid); |
1321 | else if(i == 6) |
1322 | sprintf (sbuf, "%o", gv_info->info->mode); |
1323 | |
1324 | debug_msg_logger(LOG_INFO, "%s: %s", __FUNCTION__, sbuf); |
1325 | |
1326 | return sbuf; |
1327 | } /* End Function get_variable */ |
1328 | |
1329 | static void service(struct stat statbuf, char *path) |
1330 | { |
1331 | struct devfsd_notify_struct info; |
1332 | |
1333 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1334 | |
1335 | memset (&info, 0, sizeof info); |
1336 | info.type = DEVFSD_NOTIFY_REGISTERED; |
1337 | info.mode = statbuf.st_mode; |
1338 | info.major = major (statbuf.st_rdev); |
1339 | info.minor = minor (statbuf.st_rdev); |
1340 | info.uid = statbuf.st_uid; |
1341 | info.gid = statbuf.st_gid; |
1342 | snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1); |
1343 | info.namelen = strlen (info.devname); |
1344 | service_name (&info); |
1345 | if ( S_ISDIR (statbuf.st_mode) ) |
1346 | dir_operation(SERVICE,path,0,NULL); |
1347 | } |
1348 | |
1349 | static void dir_operation(int type, const char * dir_name, int var, unsigned long *event_mask) |
1350 | /* [SUMMARY] Scan a directory tree and generate register events on leaf nodes. |
1351 | <flag> To choose which function to perform |
1352 | <dp> The directory pointer. This is closed upon completion. |
1353 | <dir_name> The name of the directory. |
1354 | <rootlen> string length parameter. |
1355 | [RETURNS] Nothing. |
1356 | */ |
1357 | { |
1358 | struct stat statbuf; |
1359 | DIR *dp; |
1360 | struct dirent *de; |
1361 | char path[STRING_LENGTH]; |
1362 | |
1363 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1364 | |
1365 | if((dp = opendir( dir_name))==NULL) |
1366 | { |
1367 | debug_msg_logger(LOG_ERR, "opendir: %s: %m", dir_name); |
1368 | return; |
1369 | } |
1370 | |
1371 | while ( (de = readdir (dp) ) != NULL ) |
1372 | { |
1373 | |
1374 | if(de->d_name && *de->d_name == '.' && (!de->d_name[1] || (de->d_name[1] == '.' && !de->d_name[2]))) |
1375 | continue; |
1376 | snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name); |
1377 | debug_msg_logger(LOG_ERR, "%s: %s", __FUNCTION__, path); |
1378 | |
1379 | if (lstat (path, &statbuf) != 0) |
1380 | { |
1381 | debug_msg_logger(LOG_ERR, "%s: %s: %m", __FUNCTION__, path); |
1382 | continue; |
1383 | } |
1384 | switch (type) |
1385 | { |
1386 | case SERVICE: |
1387 | service(statbuf,path); |
1388 | break; |
1389 | case RESTORE: |
1390 | restore(path, statbuf, var); |
1391 | break; |
1392 | case READ_CONFIG: |
1393 | read_config_file (path, var, event_mask); |
1394 | break; |
1395 | } |
1396 | } |
1397 | closedir (dp); |
1398 | } /* End Function do_scan_and_service */ |
1399 | |
1400 | static int mksymlink (const char *oldpath, const char *newpath) |
1401 | /* [SUMMARY] Create a symlink, creating intervening directories as required. |
1402 | <oldpath> The string contained in the symlink. |
1403 | <newpath> The name of the new symlink. |
1404 | [RETURNS] 0 on success, else -1. |
1405 | */ |
1406 | { |
1407 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1408 | |
1409 | if ( !make_dir_tree (newpath) ) |
1410 | return -1; |
1411 | |
1412 | if (symlink (oldpath, newpath) != 0) { |
1413 | if (errno != EEXIST) { |
1414 | debug_msg_logger(LOG_ERR, "%s: %s to %s: %m", __FUNCTION__, oldpath, newpath); |
1415 | return -1; |
1416 | } |
1417 | } |
1418 | return 0; |
1419 | } /* End Function mksymlink */ |
1420 | |
1421 | |
1422 | static int make_dir_tree (const char *path) |
1423 | /* [SUMMARY] Creating intervening directories for a path as required. |
1424 | <path> The full pathname (including the leaf node). |
1425 | [RETURNS] TRUE on success, else FALSE. |
1426 | */ |
1427 | { |
1428 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1429 | |
1430 | if (bb_make_directory( dirname((char *)path), -1, FILEUTILS_RECUR )==-1) |
1431 | { |
1432 | debug_msg_logger(LOG_ERR, "%s: %s: %m",__FUNCTION__, path); |
1433 | return FALSE; |
1434 | } |
1435 | return TRUE; |
1436 | } /* End Function make_dir_tree */ |
1437 | |
1438 | static int expand_expression(char *output, unsigned int outsize, |
1439 | const char *input, |
1440 | const char *(*get_variable_func)(const char *variable, void *info), |
1441 | void *info, |
1442 | const char *devname, |
1443 | const regmatch_t *ex, unsigned int numexp) |
1444 | /* [SUMMARY] Expand environment variables and regular subexpressions in string. |
1445 | <output> The output expanded expression is written here. |
1446 | <length> The size of the output buffer. |
1447 | <input> The input expression. This may equal <<output>>. |
1448 | <get_variable> A function which will be used to get variable values. If |
1449 | this returns NULL, the environment is searched instead. If this is NULL, |
1450 | only the environment is searched. |
1451 | <info> An arbitrary pointer passed to <<get_variable>>. |
1452 | <devname> Device name; specifically, this is the string that contains all |
1453 | of the regular subexpressions. |
1454 | <ex> Array of start / end offsets into info->devname for each subexpression |
1455 | <numexp> Number of regular subexpressions found in <<devname>>. |
1456 | [RETURNS] TRUE on success, else FALSE. |
1457 | */ |
1458 | { |
1459 | char temp[STRING_LENGTH]; |
1460 | |
1461 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1462 | |
1463 | if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) ) |
1464 | return FALSE; |
1465 | expand_regexp (output, outsize, temp, devname, ex, numexp); |
1466 | return TRUE; |
1467 | } /* End Function expand_expression */ |
1468 | |
1469 | static void expand_regexp (char *output, size_t outsize, const char *input, |
1470 | const char *devname, |
1471 | const regmatch_t *ex, unsigned int numex ) |
1472 | /* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9. |
1473 | <output> The output expanded expression is written here. |
1474 | <outsize> The size of the output buffer. |
1475 | <input> The input expression. This may NOT equal <<output>>, because |
1476 | supporting that would require yet another string-copy. However, it's not |
1477 | hard to write a simple wrapper function to add this functionality for those |
1478 | few cases that need it. |
1479 | <devname> Device name; specifically, this is the string that contains all |
1480 | of the regular subexpressions. |
1481 | <ex> An array of start and end offsets into <<devname>>, one for each |
1482 | subexpression |
1483 | <numex> Number of subexpressions in the offset-array <<ex>>. |
1484 | [RETURNS] Nothing. |
1485 | */ |
1486 | { |
1487 | const char last_exp = '0' - 1 + numex; |
1488 | int c = -1; |
1489 | |
1490 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1491 | |
1492 | /* Guarantee NULL termination by writing an explicit '\0' character into |
1493 | the very last byte */ |
1494 | if (outsize) |
1495 | output[--outsize] = '\0'; |
1496 | /* Copy the input string into the output buffer, replacing '\\' with '\' |
1497 | and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x |
1498 | codes are deleted */ |
1499 | while ( (c != '\0') && (outsize != 0) ) |
1500 | { |
1501 | c = *input; |
1502 | ++input; |
1503 | if (c == '\\') |
1504 | { |
1505 | c = *input; |
1506 | ++input; |
1507 | if (c != '\\') |
1508 | { |
1509 | if ((c >= '0') && (c <= last_exp)) |
1510 | { |
1511 | const regmatch_t *subexp = ex + (c - '0'); |
1512 | unsigned int sublen = subexp->rm_eo - subexp->rm_so; |
1513 | |
1514 | /* Range checking */ |
1515 | if (sublen > outsize) |
1516 | sublen = outsize; |
1517 | strncpy (output, devname + subexp->rm_so, sublen); |
1518 | output += sublen; |
1519 | outsize -= sublen; |
1520 | } |
1521 | continue; |
1522 | } |
1523 | } |
1524 | *output = c; |
1525 | ++output; |
1526 | --outsize; |
1527 | } /* while */ |
1528 | } /* End Function expand_regexp */ |
1529 | |
1530 | |
1531 | /* from compat_name.c */ |
1532 | |
1533 | struct translate_struct |
1534 | { |
1535 | char *match; /* The string to match to (up to length) */ |
1536 | char *format; /* Format of output, "%s" takes data past match string, |
1537 | NULL is effectively "%s" (just more efficient) */ |
1538 | }; |
1539 | |
1540 | static struct translate_struct translate_table[] = |
1541 | { |
1542 | {"sound/", NULL}, |
1543 | {"printers/", "lp%s"}, |
1544 | {"v4l/", NULL}, |
1545 | {"parports/", "parport%s"}, |
1546 | {"fb/", "fb%s"}, |
1547 | {"netlink/", NULL}, |
1548 | {"loop/", "loop%s"}, |
1549 | {"floppy/", "fd%s"}, |
1550 | {"rd/", "ram%s"}, |
1551 | {"md/", "md%s"}, /* Meta-devices */ |
1552 | {"vc/", "tty%s"}, |
1553 | {"misc/", NULL}, |
1554 | {"isdn/", NULL}, |
1555 | {"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/ |
1556 | {"i2c/", "i2c-%s"}, |
1557 | {"staliomem/", "staliomem%s"}, /* Stallion serial driver control */ |
1558 | {"tts/E", "ttyE%s"}, /* Stallion serial driver */ |
1559 | {"cua/E", "cue%s"}, /* Stallion serial driver callout */ |
1560 | {"tts/R", "ttyR%s"}, /* Rocketport serial driver */ |
1561 | {"cua/R", "cur%s"}, /* Rocketport serial driver callout */ |
1562 | {"ip2/", "ip2%s"}, /* Computone serial driver control */ |
1563 | {"tts/F", "ttyF%s"}, /* Computone serial driver */ |
1564 | {"cua/F", "cuf%s"}, /* Computone serial driver callout */ |
1565 | {"tts/C", "ttyC%s"}, /* Cyclades serial driver */ |
1566 | {"cua/C", "cub%s"}, /* Cyclades serial driver callout */ |
1567 | {"tts/", "ttyS%s"}, /* Generic serial: must be after others */ |
1568 | {"cua/", "cua%s"}, /* Generic serial: must be after others */ |
1569 | {"input/js", "js%s"}, /* Joystick driver */ |
1570 | {NULL, NULL} |
1571 | }; |
1572 | |
1573 | const char *get_old_name (const char *devname, unsigned int namelen, |
1574 | char *buffer, unsigned int major, unsigned int minor) |
1575 | /* [SUMMARY] Translate a kernel-supplied name into an old name. |
1576 | <devname> The device name provided by the kernel. |
1577 | <namelen> The length of the name. |
1578 | <buffer> A buffer that may be used. This should be at least 128 bytes long. |
1579 | <major> The major number for the device. |
1580 | <minor> The minor number for the device. |
1581 | [RETURNS] A pointer to the old name if known, else NULL. |
1582 | */ |
1583 | { |
1584 | const char *compat_name = NULL; |
1585 | char *ptr; |
1586 | struct translate_struct *trans; |
1587 | unsigned int i; |
1588 | char mode; |
1589 | int indexx; |
1590 | const char *pty1; |
1591 | const char *pty2; |
1592 | size_t len; |
1593 | /* 1 to 5 "scsi/" , 6 to 9 "ide/host", 10 sbp/, 11 vcc/, 12 pty/ */ |
1594 | static const char *const fmt[] = { |
1595 | NULL , |
1596 | "sg%u", /* scsi/generic */ |
1597 | NULL, /* scsi/disc */ |
1598 | "sr%u", /* scsi/cd */ |
1599 | NULL, /* scsi/part */ |
1600 | "nst%u%c", /* scsi/mt */ |
1601 | "hd%c" , /* ide/host/disc */ |
1602 | "hd%c" , /* ide/host/cd */ |
1603 | "hd%c%s", /* ide/host/part */ |
1604 | "%sht%d", /* ide/host/mt */ |
1605 | "sbpcd%u", /* sbp/ */ |
1606 | "vcs%s", /* vcc/ */ |
1607 | "%cty%c%c", /* pty/ */ |
1608 | NULL |
1609 | }; |
1610 | |
1611 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1612 | |
1613 | for (trans = translate_table; trans->match != NULL; ++trans) |
1614 | { |
1615 | len = strlen (trans->match); |
1616 | |
1617 | if (strncmp (devname, trans->match, len) == 0) |
1618 | { |
1619 | if (trans->format == NULL) |
1620 | return devname + len; |
1621 | sprintf (buffer, trans->format, devname + len); |
1622 | return buffer; |
1623 | } |
1624 | } |
1625 | |
1626 | ptr = (strrchr (devname, '/') + 1); |
1627 | i = scan_dev_name(devname, namelen, ptr); |
1628 | |
1629 | if( i > 0 && i < 13) |
1630 | compat_name = buffer; |
1631 | else |
1632 | return NULL; |
1633 | |
1634 | debug_msg_logger(LOG_INFO, "%s: scan_dev_name = %d", __FUNCTION__, i); |
1635 | |
1636 | /* 1 == scsi/generic, 3 == scsi/cd, 10 == sbp/ */ |
1637 | if( i == 1 || i == 3 || i == 10 ) |
1638 | sprintf (buffer, fmt[i], minor); |
1639 | |
1640 | /* 2 ==scsi/disc, 4 == scsi/part */ |
1641 | if( i == 2 || i == 4) |
1642 | compat_name = write_old_sd_name (buffer, major, minor,((i == 2)?"":(ptr + 4))); |
1643 | |
1644 | /* 5 == scsi/mt */ |
1645 | if( i == 5) |
1646 | { |
1647 | mode = ptr[2]; |
1648 | if (mode == 'n') |
1649 | mode = '\0'; |
1650 | sprintf (buffer, fmt[i], minor & 0x1f, mode); |
1651 | if (devname[namelen - 1] != 'n') |
1652 | ++compat_name; |
1653 | } |
1654 | /* 6 == ide/host/disc, 7 == ide/host/cd, 8 == ide/host/part */ |
1655 | if( i == 6 || i == 7 || i == 8 ) |
1656 | /* last arg should be ignored for i == 6 or i== 7 */ |
1657 | sprintf (buffer, fmt[i] , get_old_ide_name (major, minor), ptr + 4); |
1658 | |
1659 | /* 9 == ide/host/mt */ |
1660 | if( i == 9 ) |
1661 | sprintf (buffer, fmt[i], ptr + 2, minor & 0x7f); |
1662 | |
1663 | /* 11 == vcc/ */ |
1664 | if( i == 11 ) |
1665 | { |
1666 | sprintf (buffer, fmt[i], devname + 4); |
1667 | if (buffer[3] == '0') |
1668 | buffer[3] = '\0'; |
1669 | } |
1670 | /* 12 == pty/ */ |
1671 | if( i == 12 ) |
1672 | { |
1673 | pty1 = "pqrstuvwxyzabcde"; |
1674 | pty2 = "0123456789abcdef"; |
1675 | indexx = atoi (devname + 5); |
1676 | sprintf (buffer, fmt[i], (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]); |
1677 | } |
1678 | |
1679 | if(ENABLE_DEBUG && compat_name!=NULL) |
1680 | msg_logger(LOG_INFO, "%s: compat_name %s", __FUNCTION__, compat_name); |
1681 | |
1682 | return compat_name; |
1683 | } /* End Function get_old_name */ |
1684 | |
1685 | static char get_old_ide_name (unsigned int major, unsigned int minor) |
1686 | /* [SUMMARY] Get the old IDE name for a device. |
1687 | <major> The major number for the device. |
1688 | <minor> The minor number for the device. |
1689 | [RETURNS] The drive letter. |
1690 | */ |
1691 | { |
1692 | char letter='y'; /* 121 */ |
1693 | char c='a'; /* 97 */ |
1694 | int i=IDE0_MAJOR; |
1695 | |
1696 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1697 | |
1698 | /* I hope it works like the previous code as it saves a few bytes. Tito ;P */ |
1699 | do { |
1700 | if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR || |
1701 | i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR || |
1702 | i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR || |
1703 | i==IDE9_MAJOR ) |
1704 | { |
1705 | if((unsigned int)i==major) |
1706 | { |
1707 | letter=c; |
1708 | break; |
1709 | } |
1710 | c+=2; |
1711 | } |
1712 | i++; |
1713 | } while (i<=IDE9_MAJOR); |
1714 | |
1715 | if (minor > 63) |
1716 | ++letter; |
1717 | return letter; |
1718 | } /* End Function get_old_ide_name */ |
1719 | |
1720 | static char *write_old_sd_name (char *buffer, |
1721 | unsigned int major, unsigned int minor, |
1722 | char *part) |
1723 | /* [SUMMARY] Write the old SCSI disc name to a buffer. |
1724 | <buffer> The buffer to write to. |
1725 | <major> The major number for the device. |
1726 | <minor> The minor number for the device. |
1727 | <part> The partition string. Must be "" for a whole-disc entry. |
1728 | [RETURNS] A pointer to the buffer on success, else NULL. |
1729 | */ |
1730 | { |
1731 | unsigned int disc_index; |
1732 | |
1733 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1734 | |
1735 | if (major == 8) |
1736 | { |
1737 | sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part); |
1738 | return buffer; |
1739 | } |
1740 | if ( (major > 64) && (major < 72) ) |
1741 | { |
1742 | disc_index = ( (major - 64) << 4 ) + (minor >> 4); |
1743 | if (disc_index < 26) |
1744 | sprintf (buffer, "sd%c%s", 'a' + disc_index, part); |
1745 | else |
1746 | sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part); |
1747 | return buffer; |
1748 | } |
1749 | return NULL; |
1750 | } /* End Function write_old_sd_name */ |
1751 | |
1752 | |
1753 | /* expression.c */ |
1754 | |
1755 | /*EXPERIMENTAL_FUNCTION*/ |
1756 | |
1757 | int st_expr_expand (char *output, unsigned int length, const char *input, |
1758 | const char *(*get_variable_func) (const char *variable, |
1759 | void *info), |
1760 | void *info) |
1761 | /* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules. |
1762 | <output> The output expanded expression is written here. |
1763 | <length> The size of the output buffer. |
1764 | <input> The input expression. This may equal <<output>>. |
1765 | <get_variable> A function which will be used to get variable values. If |
1766 | this returns NULL, the environment is searched instead. If this is NULL, |
1767 | only the environment is searched. |
1768 | <info> An arbitrary pointer passed to <<get_variable>>. |
1769 | [RETURNS] TRUE on success, else FALSE. |
1770 | */ |
1771 | { |
1772 | char ch; |
1773 | unsigned int len; |
1774 | unsigned int out_pos = 0; |
1775 | const char *env; |
1776 | const char *ptr; |
1777 | struct passwd *pwent; |
1778 | char buffer[BUFFER_SIZE], tmp[STRING_LENGTH]; |
1779 | |
1780 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1781 | |
1782 | if (length > BUFFER_SIZE) |
1783 | length = BUFFER_SIZE; |
1784 | for (; TRUE; ++input) |
1785 | { |
1786 | switch (ch = *input) |
1787 | { |
1788 | case '$': |
1789 | /* Variable expansion */ |
1790 | input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info); |
1791 | if (input == NULL) |
1792 | return FALSE; |
1793 | break; |
1794 | case '~': |
1795 | /* Home directory expansion */ |
1796 | ch = input[1]; |
1797 | if ( isspace (ch) || (ch == '/') || (ch == '\0') ) |
1798 | { |
1799 | /* User's own home directory: leave separator for next time */ |
1800 | if ( ( env = getenv ("HOME") ) == NULL ) |
1801 | { |
1802 | msg_logger(LOG_INFO, bb_msg_variable_not_found, "HOME"); |
1803 | return FALSE; |
1804 | } |
1805 | len = strlen (env); |
1806 | if (len + out_pos >= length) |
1807 | goto st_expr_expand_out; |
1808 | memcpy (buffer + out_pos, env, len + 1); |
1809 | out_pos += len; |
1810 | continue; |
1811 | } |
1812 | /* Someone else's home directory */ |
1813 | for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr) |
1814 | /* VOID */ ; |
1815 | len = ptr - input; |
1816 | if (len >= sizeof tmp) |
1817 | goto st_expr_expand_out; |
1818 | safe_memcpy (tmp, input, len); |
1819 | input = ptr - 1; |
1820 | if ( ( pwent = getpwnam (tmp) ) == NULL ) |
1821 | { |
1822 | msg_logger(LOG_INFO, "no pwent for: %s", tmp); |
1823 | return FALSE; |
1824 | } |
1825 | len = strlen (pwent->pw_dir); |
1826 | if (len + out_pos >= length) |
1827 | goto st_expr_expand_out; |
1828 | memcpy (buffer + out_pos, pwent->pw_dir, len + 1); |
1829 | out_pos += len; |
1830 | break; |
1831 | case '\0': |
1832 | /* Falltrough */ |
1833 | default: |
1834 | if (out_pos >= length) |
1835 | goto st_expr_expand_out; |
1836 | buffer[out_pos++] = ch; |
1837 | if (ch == '\0') |
1838 | { |
1839 | memcpy (output, buffer, out_pos); |
1840 | return TRUE; |
1841 | } |
1842 | break; |
1843 | /* esac */ |
1844 | } |
1845 | } |
1846 | return FALSE; |
1847 | st_expr_expand_out: |
1848 | msg_logger(LOG_INFO, bb_msg_small_buffer); |
1849 | return FALSE; |
1850 | } /* End Function st_expr_expand */ |
1851 | |
1852 | |
1853 | /* Private functions follow */ |
1854 | |
1855 | static const char *expand_variable (char *buffer, unsigned int length, |
1856 | unsigned int *out_pos, const char *input, |
1857 | const char *(*func) (const char *variable, |
1858 | void *info), |
1859 | void *info) |
1860 | /* [SUMMARY] Expand a variable. |
1861 | <buffer> The buffer to write to. |
1862 | <length> The length of the output buffer. |
1863 | <out_pos> The current output position. This is updated. |
1864 | <input> A pointer to the input character pointer. |
1865 | <func> A function which will be used to get variable values. If this |
1866 | returns NULL, the environment is searched instead. If this is NULL, only |
1867 | the environment is searched. |
1868 | <info> An arbitrary pointer passed to <<func>>. |
1869 | <errfp> Diagnostic messages are written here. |
1870 | [RETURNS] A pointer to the end of this subexpression on success, else NULL. |
1871 | */ |
1872 | { |
1873 | char ch; |
1874 | int len; |
1875 | unsigned int open_braces; |
1876 | const char *env, *ptr; |
1877 | char tmp[STRING_LENGTH]; |
1878 | |
1879 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
1880 | |
1881 | ch = input[0]; |
1882 | if (ch == '$') |
1883 | { |
1884 | /* Special case for "$$": PID */ |
1885 | sprintf ( tmp, "%d", (int) getpid () ); |
1886 | len = strlen (tmp); |
1887 | if (len + *out_pos >= length) |
1888 | goto expand_variable_out; |
1889 | |
1890 | memcpy (buffer + *out_pos, tmp, len + 1); |
1891 | out_pos += len; |
1892 | return input; |
1893 | } |
1894 | /* Ordinary variable expansion, possibly in braces */ |
1895 | if (ch != '{') |
1896 | { |
1897 | /* Simple variable expansion */ |
1898 | for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr) |
1899 | /* VOID */ ; |
1900 | len = ptr - input; |
1901 | if ((size_t)len >= sizeof tmp) |
1902 | goto expand_variable_out; |
1903 | |
1904 | safe_memcpy (tmp, input, len); |
1905 | input = ptr - 1; |
1906 | if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL ) |
1907 | { |
1908 | msg_logger(LOG_INFO, bb_msg_variable_not_found, tmp); |
1909 | return NULL; |
1910 | } |
1911 | len = strlen (env); |
1912 | if (len + *out_pos >= length) |
1913 | goto expand_variable_out; |
1914 | |
1915 | memcpy (buffer + *out_pos, env, len + 1); |
1916 | *out_pos += len; |
1917 | return input; |
1918 | } |
1919 | /* Variable in braces: check for ':' tricks */ |
1920 | ch = *++input; |
1921 | for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr) |
1922 | /* VOID */; |
1923 | if (ch == '}') |
1924 | { |
1925 | /* Must be simple variable expansion with "${var}" */ |
1926 | len = ptr - input; |
1927 | if ((size_t)len >= sizeof tmp) |
1928 | goto expand_variable_out; |
1929 | |
1930 | safe_memcpy (tmp, input, len); |
1931 | ptr = expand_variable (buffer, length, out_pos, tmp, func, info ); |
1932 | if (ptr == NULL) |
1933 | return NULL; |
1934 | return input + len; |
1935 | } |
1936 | if (ch != ':' || ptr[1] != '-' ) |
1937 | { |
1938 | msg_logger(LOG_INFO, "illegal char in var name"); |
1939 | return NULL; |
1940 | } |
1941 | /* It's that handy "${var:-word}" expression. Check if var is defined */ |
1942 | len = ptr - input; |
1943 | if ((size_t)len >= sizeof tmp) |
1944 | goto expand_variable_out; |
1945 | |
1946 | safe_memcpy (tmp, input, len); |
1947 | /* Move input pointer to ':' */ |
1948 | input = ptr; |
1949 | /* First skip to closing brace, taking note of nested expressions */ |
1950 | ptr += 2; |
1951 | ch = ptr[0]; |
1952 | for (open_braces = 1; open_braces > 0; ch = *++ptr) |
1953 | { |
1954 | switch (ch) |
1955 | { |
1956 | case '{': |
1957 | ++open_braces; |
1958 | break; |
1959 | case '}': |
1960 | --open_braces; |
1961 | break; |
1962 | case '\0': |
1963 | msg_logger(LOG_INFO,"\"}\" not found in: %s", input); |
1964 | return NULL; |
1965 | default: |
1966 | break; |
1967 | } |
1968 | } |
1969 | --ptr; |
1970 | /* At this point ptr should point to closing brace of "${var:-word}" */ |
1971 | if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL ) |
1972 | { |
1973 | /* Found environment variable, so skip the input to the closing brace |
1974 | and return the variable */ |
1975 | input = ptr; |
1976 | len = strlen (env); |
1977 | if (len + *out_pos >= length) |
1978 | goto expand_variable_out; |
1979 | |
1980 | memcpy (buffer + *out_pos, env, len + 1); |
1981 | *out_pos += len; |
1982 | return input; |
1983 | } |
1984 | /* Environment variable was not found, so process word. Advance input |
1985 | pointer to start of word in "${var:-word}" */ |
1986 | input += 2; |
1987 | len = ptr - input; |
1988 | if ((size_t)len >= sizeof tmp) |
1989 | goto expand_variable_out; |
1990 | |
1991 | safe_memcpy (tmp, input, len); |
1992 | input = ptr; |
1993 | if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) ) |
1994 | return NULL; |
1995 | len = strlen (tmp); |
1996 | if (len + *out_pos >= length) |
1997 | goto expand_variable_out; |
1998 | |
1999 | memcpy (buffer + *out_pos, tmp, len + 1); |
2000 | *out_pos += len; |
2001 | return input; |
2002 | expand_variable_out: |
2003 | msg_logger(LOG_INFO, bb_msg_small_buffer); |
2004 | return NULL; |
2005 | } /* End Function expand_variable */ |
2006 | |
2007 | |
2008 | static const char *get_variable_v2 (const char *variable, |
2009 | const char *(*func) (const char *variable, void *info), |
2010 | void *info) |
2011 | /* [SUMMARY] Get a variable from the environment or . |
2012 | <variable> The variable name. |
2013 | <func> A function which will be used to get the variable. If this returns |
2014 | NULL, the environment is searched instead. If this is NULL, only the |
2015 | environment is searched. |
2016 | [RETURNS] The value of the variable on success, else NULL. |
2017 | */ |
2018 | { |
2019 | const char *value; |
2020 | |
2021 | debug_msg_logger(LOG_INFO, __FUNCTION__); |
2022 | |
2023 | if (func != NULL) |
2024 | { |
2025 | value = (*func) (variable, info); |
2026 | if (value != NULL) |
2027 | return value; |
2028 | } |
2029 | return getenv(variable); |
2030 | } /* End Function get_variable */ |
2031 | |
2032 | /* END OF CODE */ |