Contents of /trunk/mkinitrd-magellan/busybox/util-linux/mount.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: 42124 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 | * Mini mount implementation for busybox |
4 | * |
5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
7 | * Copyright (C) 2005-2006 by Rob Landley <rob@landley.net> |
8 | * |
9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
10 | */ |
11 | |
12 | /* Design notes: There is no spec for mount. Remind me to write one. |
13 | |
14 | mount_main() calls singlemount() which calls mount_it_now(). |
15 | |
16 | mount_main() can loop through /etc/fstab for mount -a |
17 | singlemount() can loop through /etc/filesystems for fstype detection. |
18 | mount_it_now() does the actual mount. |
19 | */ |
20 | |
21 | #include "busybox.h" |
22 | #include <mntent.h> |
23 | |
24 | /* Needed for nfs support only... */ |
25 | #include <syslog.h> |
26 | #include <sys/utsname.h> |
27 | #undef TRUE |
28 | #undef FALSE |
29 | #include <rpc/rpc.h> |
30 | #include <rpc/pmap_prot.h> |
31 | #include <rpc/pmap_clnt.h> |
32 | |
33 | |
34 | #if defined(__dietlibc__) |
35 | /* 16.12.2006, Sampo Kellomaki (sampo@iki.fi) |
36 | * dietlibc-0.30 does not have implementation of getmntent_r() */ |
37 | /* OTOH: why we use getmntent_r instead of getmntent? TODO... */ |
38 | struct mntent *getmntent_r(FILE* stream, struct mntent* result, char* buffer, int bufsize) |
39 | { |
40 | /* *** XXX FIXME WARNING: This hack is NOT thread safe. --Sampo */ |
41 | struct mntent* ment = getmntent(stream); |
42 | memcpy(result, ment, sizeof(struct mntent)); |
43 | return result; |
44 | } |
45 | #endif |
46 | |
47 | |
48 | // Not real flags, but we want to be able to check for this. |
49 | enum { |
50 | MOUNT_USERS = (1<<28)*ENABLE_DESKTOP, |
51 | MOUNT_NOAUTO = (1<<29), |
52 | MOUNT_SWAP = (1<<30), |
53 | }; |
54 | // TODO: more "user" flag compatibility. |
55 | // "user" option (from mount manpage): |
56 | // Only the user that mounted a filesystem can unmount it again. |
57 | // If any user should be able to unmount, then use users instead of user |
58 | // in the fstab line. The owner option is similar to the user option, |
59 | // with the restriction that the user must be the owner of the special file. |
60 | // This may be useful e.g. for /dev/fd if a login script makes |
61 | // the console user owner of this device. |
62 | |
63 | /* Standard mount options (from -o options or --options), with corresponding |
64 | * flags */ |
65 | |
66 | struct { |
67 | char *name; |
68 | long flags; |
69 | } static mount_options[] = { |
70 | // MS_FLAGS set a bit. ~MS_FLAGS disable that bit. 0 flags are NOPs. |
71 | |
72 | USE_FEATURE_MOUNT_LOOP( |
73 | {"loop", 0}, |
74 | ) |
75 | |
76 | USE_FEATURE_MOUNT_FSTAB( |
77 | {"defaults", 0}, |
78 | /* {"quiet", 0}, - do not filter out, vfat wants to see it */ |
79 | {"noauto", MOUNT_NOAUTO}, |
80 | {"swap", MOUNT_SWAP}, |
81 | USE_DESKTOP({"user", MOUNT_USERS},) |
82 | USE_DESKTOP({"users", MOUNT_USERS},) |
83 | ) |
84 | |
85 | USE_FEATURE_MOUNT_FLAGS( |
86 | // vfs flags |
87 | {"nosuid", MS_NOSUID}, |
88 | {"suid", ~MS_NOSUID}, |
89 | {"dev", ~MS_NODEV}, |
90 | {"nodev", MS_NODEV}, |
91 | {"exec", ~MS_NOEXEC}, |
92 | {"noexec", MS_NOEXEC}, |
93 | {"sync", MS_SYNCHRONOUS}, |
94 | {"async", ~MS_SYNCHRONOUS}, |
95 | {"atime", ~MS_NOATIME}, |
96 | {"noatime", MS_NOATIME}, |
97 | {"diratime", ~MS_NODIRATIME}, |
98 | {"nodiratime", MS_NODIRATIME}, |
99 | {"loud", ~MS_SILENT}, |
100 | |
101 | // action flags |
102 | |
103 | {"bind", MS_BIND}, |
104 | {"move", MS_MOVE}, |
105 | {"shared", MS_SHARED}, |
106 | {"slave", MS_SLAVE}, |
107 | {"private", MS_PRIVATE}, |
108 | {"unbindable", MS_UNBINDABLE}, |
109 | {"rshared", MS_SHARED|MS_RECURSIVE}, |
110 | {"rslave", MS_SLAVE|MS_RECURSIVE}, |
111 | {"rprivate", MS_SLAVE|MS_RECURSIVE}, |
112 | {"runbindable", MS_UNBINDABLE|MS_RECURSIVE}, |
113 | ) |
114 | |
115 | // Always understood. |
116 | |
117 | {"ro", MS_RDONLY}, // vfs flag |
118 | {"rw", ~MS_RDONLY}, // vfs flag |
119 | {"remount", MS_REMOUNT}, // action flag |
120 | }; |
121 | |
122 | #define VECTOR_SIZE(v) (sizeof(v) / sizeof((v)[0])) |
123 | |
124 | /* Append mount options to string */ |
125 | static void append_mount_options(char **oldopts, char *newopts) |
126 | { |
127 | if (*oldopts && **oldopts) { |
128 | /* do not insert options which are already there */ |
129 | while (newopts[0]) { |
130 | char *p; |
131 | int len = strlen(newopts); |
132 | p = strchr(newopts, ','); |
133 | if (p) len = p - newopts; |
134 | p = *oldopts; |
135 | while (1) { |
136 | if (!strncmp(p, newopts, len) |
137 | && (p[len]==',' || p[len]==0)) |
138 | goto skip; |
139 | p = strchr(p,','); |
140 | if(!p) break; |
141 | p++; |
142 | } |
143 | p = xasprintf("%s,%.*s", *oldopts, len, newopts); |
144 | free(*oldopts); |
145 | *oldopts = p; |
146 | skip: |
147 | newopts += len; |
148 | while (newopts[0] == ',') newopts++; |
149 | } |
150 | } else { |
151 | if (ENABLE_FEATURE_CLEAN_UP) free(*oldopts); |
152 | *oldopts = xstrdup(newopts); |
153 | } |
154 | } |
155 | |
156 | /* Use the mount_options list to parse options into flags. |
157 | * Also return list of unrecognized options if unrecognized!=NULL */ |
158 | static int parse_mount_options(char *options, char **unrecognized) |
159 | { |
160 | int flags = MS_SILENT; |
161 | |
162 | // Loop through options |
163 | for (;;) { |
164 | int i; |
165 | char *comma = strchr(options, ','); |
166 | |
167 | if (comma) *comma = 0; |
168 | |
169 | // Find this option in mount_options |
170 | for (i = 0; i < VECTOR_SIZE(mount_options); i++) { |
171 | if (!strcasecmp(mount_options[i].name, options)) { |
172 | long fl = mount_options[i].flags; |
173 | if (fl < 0) flags &= fl; |
174 | else flags |= fl; |
175 | break; |
176 | } |
177 | } |
178 | // If unrecognized not NULL, append unrecognized mount options */ |
179 | if (unrecognized && i == VECTOR_SIZE(mount_options)) { |
180 | // Add it to strflags, to pass on to kernel |
181 | i = *unrecognized ? strlen(*unrecognized) : 0; |
182 | *unrecognized = xrealloc(*unrecognized, i+strlen(options)+2); |
183 | |
184 | // Comma separated if it's not the first one |
185 | if (i) (*unrecognized)[i++] = ','; |
186 | strcpy((*unrecognized)+i, options); |
187 | } |
188 | |
189 | // Advance to next option, or finish |
190 | if (comma) { |
191 | *comma = ','; |
192 | options = ++comma; |
193 | } else break; |
194 | } |
195 | |
196 | return flags; |
197 | } |
198 | |
199 | // Return a list of all block device backed filesystems |
200 | |
201 | static llist_t *get_block_backed_filesystems(void) |
202 | { |
203 | static const char *const filesystems[] = { |
204 | "/etc/filesystems", |
205 | "/proc/filesystems", |
206 | 0 |
207 | }; |
208 | char *fs, *buf; |
209 | llist_t *list = 0; |
210 | int i; |
211 | FILE *f; |
212 | |
213 | for (i = 0; filesystems[i]; i++) { |
214 | f = fopen(filesystems[i], "r"); |
215 | if (!f) continue; |
216 | |
217 | while ((buf = xmalloc_getline(f)) != 0) { |
218 | if (!strncmp(buf, "nodev", 5) && isspace(buf[5])) |
219 | continue; |
220 | fs = skip_whitespace(buf); |
221 | if (*fs=='#' || *fs=='*' || !*fs) continue; |
222 | |
223 | llist_add_to_end(&list, xstrdup(fs)); |
224 | free(buf); |
225 | } |
226 | if (ENABLE_FEATURE_CLEAN_UP) fclose(f); |
227 | } |
228 | |
229 | return list; |
230 | } |
231 | |
232 | llist_t *fslist = 0; |
233 | |
234 | #if ENABLE_FEATURE_CLEAN_UP |
235 | static void delete_block_backed_filesystems(void) |
236 | { |
237 | llist_free(fslist, free); |
238 | } |
239 | #else |
240 | void delete_block_backed_filesystems(void); |
241 | #endif |
242 | |
243 | #if ENABLE_FEATURE_MTAB_SUPPORT |
244 | static int useMtab = 1; |
245 | static int fakeIt; |
246 | #else |
247 | #define useMtab 0 |
248 | #define fakeIt 0 |
249 | #endif |
250 | |
251 | // Perform actual mount of specific filesystem at specific location. |
252 | // NB: mp->xxx fields may be trashed on exit |
253 | static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts) |
254 | { |
255 | int rc = 0; |
256 | |
257 | if (fakeIt) goto mtab; |
258 | |
259 | // Mount, with fallback to read-only if necessary. |
260 | |
261 | for (;;) { |
262 | rc = mount(mp->mnt_fsname, mp->mnt_dir, mp->mnt_type, |
263 | vfsflags, filteropts); |
264 | if (!rc || (vfsflags&MS_RDONLY) || (errno!=EACCES && errno!=EROFS)) |
265 | break; |
266 | bb_error_msg("%s is write-protected, mounting read-only", |
267 | mp->mnt_fsname); |
268 | vfsflags |= MS_RDONLY; |
269 | } |
270 | |
271 | // Abort entirely if permission denied. |
272 | |
273 | if (rc && errno == EPERM) |
274 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root); |
275 | |
276 | /* If the mount was successful, and we're maintaining an old-style |
277 | * mtab file by hand, add the new entry to it now. */ |
278 | mtab: |
279 | if (ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc && !(vfsflags & MS_REMOUNT)) { |
280 | char *fsname; |
281 | FILE *mountTable = setmntent(bb_path_mtab_file, "a+"); |
282 | int i; |
283 | |
284 | if (!mountTable) { |
285 | bb_error_msg("no %s",bb_path_mtab_file); |
286 | goto ret; |
287 | } |
288 | |
289 | // Add vfs string flags |
290 | |
291 | for (i=0; mount_options[i].flags != MS_REMOUNT; i++) |
292 | if (mount_options[i].flags > 0 && (mount_options[i].flags & vfsflags)) |
293 | append_mount_options(&(mp->mnt_opts), mount_options[i].name); |
294 | |
295 | // Remove trailing / (if any) from directory we mounted on |
296 | |
297 | i = strlen(mp->mnt_dir) - 1; |
298 | if (i > 0 && mp->mnt_dir[i] == '/') mp->mnt_dir[i] = 0; |
299 | |
300 | // Convert to canonical pathnames as needed |
301 | |
302 | mp->mnt_dir = bb_simplify_path(mp->mnt_dir); |
303 | fsname = 0; |
304 | if (!mp->mnt_type || !*mp->mnt_type) { /* bind mount */ |
305 | mp->mnt_fsname = fsname = bb_simplify_path(mp->mnt_fsname); |
306 | mp->mnt_type = "bind"; |
307 | } |
308 | mp->mnt_freq = mp->mnt_passno = 0; |
309 | |
310 | // Write and close. |
311 | |
312 | addmntent(mountTable, mp); |
313 | endmntent(mountTable); |
314 | if (ENABLE_FEATURE_CLEAN_UP) { |
315 | free(mp->mnt_dir); |
316 | free(fsname); |
317 | } |
318 | } |
319 | ret: |
320 | return rc; |
321 | } |
322 | |
323 | #if ENABLE_FEATURE_MOUNT_NFS |
324 | |
325 | /* |
326 | * Linux NFS mount |
327 | * Copyright (C) 1993 Rick Sladkey <jrs@world.std.com> |
328 | * |
329 | * Licensed under GPLv2, see file LICENSE in this tarball for details. |
330 | * |
331 | * Wed Feb 8 12:51:48 1995, biro@yggdrasil.com (Ross Biro): allow all port |
332 | * numbers to be specified on the command line. |
333 | * |
334 | * Fri, 8 Mar 1996 18:01:39, Swen Thuemmler <swen@uni-paderborn.de>: |
335 | * Omit the call to connect() for Linux version 1.3.11 or later. |
336 | * |
337 | * Wed Oct 1 23:55:28 1997: Dick Streefland <dick_streefland@tasking.com> |
338 | * Implemented the "bg", "fg" and "retry" mount options for NFS. |
339 | * |
340 | * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org> |
341 | * - added Native Language Support |
342 | * |
343 | * Modified by Olaf Kirch and Trond Myklebust for new NFS code, |
344 | * plus NFSv3 stuff. |
345 | */ |
346 | |
347 | /* This is just a warning of a common mistake. Possibly this should be a |
348 | * uclibc faq entry rather than in busybox... */ |
349 | #if defined(__UCLIBC__) && ! defined(__UCLIBC_HAS_RPC__) |
350 | #error "You need to build uClibc with UCLIBC_HAS_RPC for NFS support." |
351 | #endif |
352 | |
353 | #define MOUNTPORT 635 |
354 | #define MNTPATHLEN 1024 |
355 | #define MNTNAMLEN 255 |
356 | #define FHSIZE 32 |
357 | #define FHSIZE3 64 |
358 | |
359 | typedef char fhandle[FHSIZE]; |
360 | |
361 | typedef struct { |
362 | unsigned int fhandle3_len; |
363 | char *fhandle3_val; |
364 | } fhandle3; |
365 | |
366 | enum mountstat3 { |
367 | MNT_OK = 0, |
368 | MNT3ERR_PERM = 1, |
369 | MNT3ERR_NOENT = 2, |
370 | MNT3ERR_IO = 5, |
371 | MNT3ERR_ACCES = 13, |
372 | MNT3ERR_NOTDIR = 20, |
373 | MNT3ERR_INVAL = 22, |
374 | MNT3ERR_NAMETOOLONG = 63, |
375 | MNT3ERR_NOTSUPP = 10004, |
376 | MNT3ERR_SERVERFAULT = 10006, |
377 | }; |
378 | typedef enum mountstat3 mountstat3; |
379 | |
380 | struct fhstatus { |
381 | unsigned int fhs_status; |
382 | union { |
383 | fhandle fhs_fhandle; |
384 | } fhstatus_u; |
385 | }; |
386 | typedef struct fhstatus fhstatus; |
387 | |
388 | struct mountres3_ok { |
389 | fhandle3 fhandle; |
390 | struct { |
391 | unsigned int auth_flavours_len; |
392 | char *auth_flavours_val; |
393 | } auth_flavours; |
394 | }; |
395 | typedef struct mountres3_ok mountres3_ok; |
396 | |
397 | struct mountres3 { |
398 | mountstat3 fhs_status; |
399 | union { |
400 | mountres3_ok mountinfo; |
401 | } mountres3_u; |
402 | }; |
403 | typedef struct mountres3 mountres3; |
404 | |
405 | typedef char *dirpath; |
406 | |
407 | typedef char *name; |
408 | |
409 | typedef struct mountbody *mountlist; |
410 | |
411 | struct mountbody { |
412 | name ml_hostname; |
413 | dirpath ml_directory; |
414 | mountlist ml_next; |
415 | }; |
416 | typedef struct mountbody mountbody; |
417 | |
418 | typedef struct groupnode *groups; |
419 | |
420 | struct groupnode { |
421 | name gr_name; |
422 | groups gr_next; |
423 | }; |
424 | typedef struct groupnode groupnode; |
425 | |
426 | typedef struct exportnode *exports; |
427 | |
428 | struct exportnode { |
429 | dirpath ex_dir; |
430 | groups ex_groups; |
431 | exports ex_next; |
432 | }; |
433 | typedef struct exportnode exportnode; |
434 | |
435 | struct ppathcnf { |
436 | int pc_link_max; |
437 | short pc_max_canon; |
438 | short pc_max_input; |
439 | short pc_name_max; |
440 | short pc_path_max; |
441 | short pc_pipe_buf; |
442 | uint8_t pc_vdisable; |
443 | char pc_xxx; |
444 | short pc_mask[2]; |
445 | }; |
446 | typedef struct ppathcnf ppathcnf; |
447 | |
448 | #define MOUNTPROG 100005 |
449 | #define MOUNTVERS 1 |
450 | |
451 | #define MOUNTPROC_NULL 0 |
452 | #define MOUNTPROC_MNT 1 |
453 | #define MOUNTPROC_DUMP 2 |
454 | #define MOUNTPROC_UMNT 3 |
455 | #define MOUNTPROC_UMNTALL 4 |
456 | #define MOUNTPROC_EXPORT 5 |
457 | #define MOUNTPROC_EXPORTALL 6 |
458 | |
459 | #define MOUNTVERS_POSIX 2 |
460 | |
461 | #define MOUNTPROC_PATHCONF 7 |
462 | |
463 | #define MOUNT_V3 3 |
464 | |
465 | #define MOUNTPROC3_NULL 0 |
466 | #define MOUNTPROC3_MNT 1 |
467 | #define MOUNTPROC3_DUMP 2 |
468 | #define MOUNTPROC3_UMNT 3 |
469 | #define MOUNTPROC3_UMNTALL 4 |
470 | #define MOUNTPROC3_EXPORT 5 |
471 | |
472 | enum { |
473 | #ifndef NFS_FHSIZE |
474 | NFS_FHSIZE = 32, |
475 | #endif |
476 | #ifndef NFS_PORT |
477 | NFS_PORT = 2049 |
478 | #endif |
479 | }; |
480 | |
481 | /* |
482 | * We want to be able to compile mount on old kernels in such a way |
483 | * that the binary will work well on more recent kernels. |
484 | * Thus, if necessary we teach nfsmount.c the structure of new fields |
485 | * that will come later. |
486 | * |
487 | * Moreover, the new kernel includes conflict with glibc includes |
488 | * so it is easiest to ignore the kernel altogether (at compile time). |
489 | */ |
490 | |
491 | struct nfs2_fh { |
492 | char data[32]; |
493 | }; |
494 | struct nfs3_fh { |
495 | unsigned short size; |
496 | unsigned char data[64]; |
497 | }; |
498 | |
499 | struct nfs_mount_data { |
500 | int version; /* 1 */ |
501 | int fd; /* 1 */ |
502 | struct nfs2_fh old_root; /* 1 */ |
503 | int flags; /* 1 */ |
504 | int rsize; /* 1 */ |
505 | int wsize; /* 1 */ |
506 | int timeo; /* 1 */ |
507 | int retrans; /* 1 */ |
508 | int acregmin; /* 1 */ |
509 | int acregmax; /* 1 */ |
510 | int acdirmin; /* 1 */ |
511 | int acdirmax; /* 1 */ |
512 | struct sockaddr_in addr; /* 1 */ |
513 | char hostname[256]; /* 1 */ |
514 | int namlen; /* 2 */ |
515 | unsigned int bsize; /* 3 */ |
516 | struct nfs3_fh root; /* 4 */ |
517 | }; |
518 | |
519 | /* bits in the flags field */ |
520 | enum { |
521 | NFS_MOUNT_SOFT = 0x0001, /* 1 */ |
522 | NFS_MOUNT_INTR = 0x0002, /* 1 */ |
523 | NFS_MOUNT_SECURE = 0x0004, /* 1 */ |
524 | NFS_MOUNT_POSIX = 0x0008, /* 1 */ |
525 | NFS_MOUNT_NOCTO = 0x0010, /* 1 */ |
526 | NFS_MOUNT_NOAC = 0x0020, /* 1 */ |
527 | NFS_MOUNT_TCP = 0x0040, /* 2 */ |
528 | NFS_MOUNT_VER3 = 0x0080, /* 3 */ |
529 | NFS_MOUNT_KERBEROS = 0x0100, /* 3 */ |
530 | NFS_MOUNT_NONLM = 0x0200 /* 3 */ |
531 | }; |
532 | |
533 | |
534 | /* |
535 | * We need to translate between nfs status return values and |
536 | * the local errno values which may not be the same. |
537 | * |
538 | * Andreas Schwab <schwab@LS5.informatik.uni-dortmund.de>: change errno: |
539 | * "after #include <errno.h> the symbol errno is reserved for any use, |
540 | * it cannot even be used as a struct tag or field name". |
541 | */ |
542 | |
543 | #ifndef EDQUOT |
544 | #define EDQUOT ENOSPC |
545 | #endif |
546 | |
547 | // Convert each NFSERR_BLAH into EBLAH |
548 | |
549 | static const struct { |
550 | int stat; |
551 | int errnum; |
552 | } nfs_errtbl[] = { |
553 | {0,0}, {1,EPERM}, {2,ENOENT}, {5,EIO}, {6,ENXIO}, {13,EACCES}, {17,EEXIST}, |
554 | {19,ENODEV}, {20,ENOTDIR}, {21,EISDIR}, {22,EINVAL}, {27,EFBIG}, |
555 | {28,ENOSPC}, {30,EROFS}, {63,ENAMETOOLONG}, {66,ENOTEMPTY}, {69,EDQUOT}, |
556 | {70,ESTALE}, {71,EREMOTE}, {-1,EIO} |
557 | }; |
558 | |
559 | static char *nfs_strerror(int status) |
560 | { |
561 | int i; |
562 | static char buf[sizeof("unknown nfs status return value: ") + sizeof(int)*3]; |
563 | |
564 | for (i = 0; nfs_errtbl[i].stat != -1; i++) { |
565 | if (nfs_errtbl[i].stat == status) |
566 | return strerror(nfs_errtbl[i].errnum); |
567 | } |
568 | sprintf(buf, "unknown nfs status return value: %d", status); |
569 | return buf; |
570 | } |
571 | |
572 | static bool_t xdr_fhandle(XDR *xdrs, fhandle objp) |
573 | { |
574 | if (!xdr_opaque(xdrs, objp, FHSIZE)) |
575 | return FALSE; |
576 | return TRUE; |
577 | } |
578 | |
579 | static bool_t xdr_fhstatus(XDR *xdrs, fhstatus *objp) |
580 | { |
581 | if (!xdr_u_int(xdrs, &objp->fhs_status)) |
582 | return FALSE; |
583 | switch (objp->fhs_status) { |
584 | case 0: |
585 | if (!xdr_fhandle(xdrs, objp->fhstatus_u.fhs_fhandle)) |
586 | return FALSE; |
587 | break; |
588 | default: |
589 | break; |
590 | } |
591 | return TRUE; |
592 | } |
593 | |
594 | static bool_t xdr_dirpath(XDR *xdrs, dirpath *objp) |
595 | { |
596 | if (!xdr_string(xdrs, objp, MNTPATHLEN)) |
597 | return FALSE; |
598 | return TRUE; |
599 | } |
600 | |
601 | static bool_t xdr_fhandle3(XDR *xdrs, fhandle3 *objp) |
602 | { |
603 | if (!xdr_bytes(xdrs, (char **)&objp->fhandle3_val, (unsigned int *) &objp->fhandle3_len, FHSIZE3)) |
604 | return FALSE; |
605 | return TRUE; |
606 | } |
607 | |
608 | static bool_t xdr_mountres3_ok(XDR *xdrs, mountres3_ok *objp) |
609 | { |
610 | if (!xdr_fhandle3(xdrs, &objp->fhandle)) |
611 | return FALSE; |
612 | if (!xdr_array(xdrs, &(objp->auth_flavours.auth_flavours_val), &(objp->auth_flavours.auth_flavours_len), ~0, |
613 | sizeof (int), (xdrproc_t) xdr_int)) |
614 | return FALSE; |
615 | return TRUE; |
616 | } |
617 | |
618 | static bool_t xdr_mountstat3(XDR *xdrs, mountstat3 *objp) |
619 | { |
620 | if (!xdr_enum(xdrs, (enum_t *) objp)) |
621 | return FALSE; |
622 | return TRUE; |
623 | } |
624 | |
625 | static bool_t xdr_mountres3(XDR *xdrs, mountres3 *objp) |
626 | { |
627 | if (!xdr_mountstat3(xdrs, &objp->fhs_status)) |
628 | return FALSE; |
629 | switch (objp->fhs_status) { |
630 | case MNT_OK: |
631 | if (!xdr_mountres3_ok(xdrs, &objp->mountres3_u.mountinfo)) |
632 | return FALSE; |
633 | break; |
634 | default: |
635 | break; |
636 | } |
637 | return TRUE; |
638 | } |
639 | |
640 | #define MAX_NFSPROT ((nfs_mount_version >= 4) ? 3 : 2) |
641 | |
642 | /* |
643 | * nfs_mount_version according to the sources seen at compile time. |
644 | */ |
645 | static int nfs_mount_version; |
646 | static int kernel_version; |
647 | |
648 | /* |
649 | * Unfortunately, the kernel prints annoying console messages |
650 | * in case of an unexpected nfs mount version (instead of |
651 | * just returning some error). Therefore we'll have to try |
652 | * and figure out what version the kernel expects. |
653 | * |
654 | * Variables: |
655 | * KERNEL_NFS_MOUNT_VERSION: kernel sources at compile time |
656 | * NFS_MOUNT_VERSION: these nfsmount sources at compile time |
657 | * nfs_mount_version: version this source and running kernel can handle |
658 | */ |
659 | static void |
660 | find_kernel_nfs_mount_version(void) |
661 | { |
662 | if (kernel_version) |
663 | return; |
664 | |
665 | nfs_mount_version = 4; /* default */ |
666 | |
667 | kernel_version = get_linux_version_code(); |
668 | if (kernel_version) { |
669 | if (kernel_version < KERNEL_VERSION(2,1,32)) |
670 | nfs_mount_version = 1; |
671 | else if (kernel_version < KERNEL_VERSION(2,2,18) || |
672 | (kernel_version >= KERNEL_VERSION(2,3,0) && |
673 | kernel_version < KERNEL_VERSION(2,3,99))) |
674 | nfs_mount_version = 3; |
675 | /* else v4 since 2.3.99pre4 */ |
676 | } |
677 | } |
678 | |
679 | static struct pmap * |
680 | get_mountport(struct sockaddr_in *server_addr, |
681 | long unsigned prog, |
682 | long unsigned version, |
683 | long unsigned proto, |
684 | long unsigned port) |
685 | { |
686 | struct pmaplist *pmap; |
687 | static struct pmap p = {0, 0, 0, 0}; |
688 | |
689 | server_addr->sin_port = PMAPPORT; |
690 | pmap = pmap_getmaps(server_addr); |
691 | |
692 | if (version > MAX_NFSPROT) |
693 | version = MAX_NFSPROT; |
694 | if (!prog) |
695 | prog = MOUNTPROG; |
696 | p.pm_prog = prog; |
697 | p.pm_vers = version; |
698 | p.pm_prot = proto; |
699 | p.pm_port = port; |
700 | |
701 | while (pmap) { |
702 | if (pmap->pml_map.pm_prog != prog) |
703 | goto next; |
704 | if (!version && p.pm_vers > pmap->pml_map.pm_vers) |
705 | goto next; |
706 | if (version > 2 && pmap->pml_map.pm_vers != version) |
707 | goto next; |
708 | if (version && version <= 2 && pmap->pml_map.pm_vers > 2) |
709 | goto next; |
710 | if (pmap->pml_map.pm_vers > MAX_NFSPROT || |
711 | (proto && p.pm_prot && pmap->pml_map.pm_prot != proto) || |
712 | (port && pmap->pml_map.pm_port != port)) |
713 | goto next; |
714 | memcpy(&p, &pmap->pml_map, sizeof(p)); |
715 | next: |
716 | pmap = pmap->pml_next; |
717 | } |
718 | if (!p.pm_vers) |
719 | p.pm_vers = MOUNTVERS; |
720 | if (!p.pm_port) |
721 | p.pm_port = MOUNTPORT; |
722 | if (!p.pm_prot) |
723 | p.pm_prot = IPPROTO_TCP; |
724 | return &p; |
725 | } |
726 | |
727 | static int daemonize(void) |
728 | { |
729 | int fd; |
730 | int pid = fork(); |
731 | if (pid < 0) /* error */ |
732 | return -errno; |
733 | if (pid > 0) /* parent */ |
734 | return 0; |
735 | /* child */ |
736 | fd = xopen(bb_dev_null, O_RDWR); |
737 | dup2(fd, 0); |
738 | dup2(fd, 1); |
739 | dup2(fd, 2); |
740 | while (fd > 2) close(fd--); |
741 | setsid(); |
742 | openlog(applet_name, LOG_PID, LOG_DAEMON); |
743 | logmode = LOGMODE_SYSLOG; |
744 | return 1; |
745 | } |
746 | |
747 | // TODO |
748 | static inline int we_saw_this_host_before(const char *hostname) |
749 | { |
750 | return 0; |
751 | } |
752 | |
753 | /* RPC strerror analogs are terminally idiotic: |
754 | * *mandatory* prefix and \n at end. |
755 | * This hopefully helps. Usage: |
756 | * error_msg_rpc(clnt_*error*(" ")) */ |
757 | static void error_msg_rpc(const char *msg) |
758 | { |
759 | int len; |
760 | while (msg[0] == ' ' || msg[0] == ':') msg++; |
761 | len = strlen(msg); |
762 | while (len && msg[len-1] == '\n') len--; |
763 | bb_error_msg("%.*s", len, msg); |
764 | } |
765 | |
766 | // NB: mp->xxx fields may be trashed on exit |
767 | static int nfsmount(struct mntent *mp, int vfsflags, char *filteropts) |
768 | { |
769 | CLIENT *mclient; |
770 | char *hostname; |
771 | char *pathname; |
772 | char *mounthost; |
773 | struct nfs_mount_data data; |
774 | char *opt; |
775 | struct hostent *hp; |
776 | struct sockaddr_in server_addr; |
777 | struct sockaddr_in mount_server_addr; |
778 | int msock, fsock; |
779 | union { |
780 | struct fhstatus nfsv2; |
781 | struct mountres3 nfsv3; |
782 | } status; |
783 | int daemonized; |
784 | char *s; |
785 | int port; |
786 | int mountport; |
787 | int proto; |
788 | int bg; |
789 | int soft; |
790 | int intr; |
791 | int posix; |
792 | int nocto; |
793 | int noac; |
794 | int nolock; |
795 | int retry; |
796 | int tcp; |
797 | int mountprog; |
798 | int mountvers; |
799 | int nfsprog; |
800 | int nfsvers; |
801 | int retval; |
802 | |
803 | find_kernel_nfs_mount_version(); |
804 | |
805 | daemonized = 0; |
806 | mounthost = NULL; |
807 | retval = ETIMEDOUT; |
808 | msock = fsock = -1; |
809 | mclient = NULL; |
810 | |
811 | /* NB: hostname, mounthost, filteropts must be free()d prior to return */ |
812 | |
813 | filteropts = xstrdup(filteropts); /* going to trash it later... */ |
814 | |
815 | hostname = xstrdup(mp->mnt_fsname); |
816 | /* mount_main() guarantees that ':' is there */ |
817 | s = strchr(hostname, ':'); |
818 | pathname = s + 1; |
819 | *s = '\0'; |
820 | /* Ignore all but first hostname in replicated mounts |
821 | until they can be fully supported. (mack@sgi.com) */ |
822 | s = strchr(hostname, ','); |
823 | if (s) { |
824 | *s = '\0'; |
825 | bb_error_msg("warning: multiple hostnames not supported"); |
826 | } |
827 | |
828 | server_addr.sin_family = AF_INET; |
829 | if (!inet_aton(hostname, &server_addr.sin_addr)) { |
830 | hp = gethostbyname(hostname); |
831 | if (hp == NULL) { |
832 | bb_herror_msg("%s", hostname); |
833 | goto fail; |
834 | } |
835 | if (hp->h_length > sizeof(struct in_addr)) { |
836 | bb_error_msg("got bad hp->h_length"); |
837 | hp->h_length = sizeof(struct in_addr); |
838 | } |
839 | memcpy(&server_addr.sin_addr, |
840 | hp->h_addr, hp->h_length); |
841 | } |
842 | |
843 | memcpy(&mount_server_addr, &server_addr, sizeof(mount_server_addr)); |
844 | |
845 | /* add IP address to mtab options for use when unmounting */ |
846 | |
847 | if (!mp->mnt_opts) { /* TODO: actually mp->mnt_opts is never NULL */ |
848 | mp->mnt_opts = xasprintf("addr=%s", inet_ntoa(server_addr.sin_addr)); |
849 | } else { |
850 | char *tmp = xasprintf("%s%saddr=%s", mp->mnt_opts, |
851 | mp->mnt_opts[0] ? "," : "", |
852 | inet_ntoa(server_addr.sin_addr)); |
853 | free(mp->mnt_opts); |
854 | mp->mnt_opts = tmp; |
855 | } |
856 | |
857 | /* Set default options. |
858 | * rsize/wsize (and bsize, for ver >= 3) are left 0 in order to |
859 | * let the kernel decide. |
860 | * timeo is filled in after we know whether it'll be TCP or UDP. */ |
861 | memset(&data, 0, sizeof(data)); |
862 | data.retrans = 3; |
863 | data.acregmin = 3; |
864 | data.acregmax = 60; |
865 | data.acdirmin = 30; |
866 | data.acdirmax = 60; |
867 | data.namlen = NAME_MAX; |
868 | |
869 | bg = 0; |
870 | soft = 0; |
871 | intr = 0; |
872 | posix = 0; |
873 | nocto = 0; |
874 | nolock = 0; |
875 | noac = 0; |
876 | retry = 10000; /* 10000 minutes ~ 1 week */ |
877 | tcp = 0; |
878 | |
879 | mountprog = MOUNTPROG; |
880 | mountvers = 0; |
881 | port = 0; |
882 | mountport = 0; |
883 | nfsprog = 100003; |
884 | nfsvers = 0; |
885 | |
886 | /* parse options */ |
887 | |
888 | for (opt = strtok(filteropts, ","); opt; opt = strtok(NULL, ",")) { |
889 | char *opteq = strchr(opt, '='); |
890 | if (opteq) { |
891 | const char *const options[] = { |
892 | /* 0 */ "rsize", |
893 | /* 1 */ "wsize", |
894 | /* 2 */ "timeo", |
895 | /* 3 */ "retrans", |
896 | /* 4 */ "acregmin", |
897 | /* 5 */ "acregmax", |
898 | /* 6 */ "acdirmin", |
899 | /* 7 */ "acdirmax", |
900 | /* 8 */ "actimeo", |
901 | /* 9 */ "retry", |
902 | /* 10 */ "port", |
903 | /* 11 */ "mountport", |
904 | /* 12 */ "mounthost", |
905 | /* 13 */ "mountprog", |
906 | /* 14 */ "mountvers", |
907 | /* 15 */ "nfsprog", |
908 | /* 16 */ "nfsvers", |
909 | /* 17 */ "vers", |
910 | /* 18 */ "proto", |
911 | /* 19 */ "namlen", |
912 | /* 20 */ "addr", |
913 | NULL |
914 | }; |
915 | int val = xatoi_u(opteq + 1); |
916 | *opteq = '\0'; |
917 | switch (index_in_str_array(options, opt)) { |
918 | case 0: // "rsize" |
919 | data.rsize = val; |
920 | break; |
921 | case 1: // "wsize" |
922 | data.wsize = val; |
923 | break; |
924 | case 2: // "timeo" |
925 | data.timeo = val; |
926 | break; |
927 | case 3: // "retrans" |
928 | data.retrans = val; |
929 | break; |
930 | case 4: // "acregmin" |
931 | data.acregmin = val; |
932 | break; |
933 | case 5: // "acregmax" |
934 | data.acregmax = val; |
935 | break; |
936 | case 6: // "acdirmin" |
937 | data.acdirmin = val; |
938 | break; |
939 | case 7: // "acdirmax" |
940 | data.acdirmax = val; |
941 | break; |
942 | case 8: // "actimeo" |
943 | data.acregmin = val; |
944 | data.acregmax = val; |
945 | data.acdirmin = val; |
946 | data.acdirmax = val; |
947 | break; |
948 | case 9: // "retry" |
949 | retry = val; |
950 | break; |
951 | case 10: // "port" |
952 | port = val; |
953 | break; |
954 | case 11: // "mountport" |
955 | mountport = val; |
956 | break; |
957 | case 12: // "mounthost" |
958 | mounthost = xstrndup(opteq+1, |
959 | strcspn(opteq+1," \t\n\r,")); |
960 | break; |
961 | case 13: // "mountprog" |
962 | mountprog = val; |
963 | break; |
964 | case 14: // "mountvers" |
965 | mountvers = val; |
966 | break; |
967 | case 15: // "nfsprog" |
968 | nfsprog = val; |
969 | break; |
970 | case 16: // "nfsvers" |
971 | case 17: // "vers" |
972 | nfsvers = val; |
973 | break; |
974 | case 18: // "proto" |
975 | if (!strncmp(opteq+1, "tcp", 3)) |
976 | tcp = 1; |
977 | else if (!strncmp(opteq+1, "udp", 3)) |
978 | tcp = 0; |
979 | else |
980 | bb_error_msg("warning: unrecognized proto= option"); |
981 | break; |
982 | case 19: // "namlen" |
983 | if (nfs_mount_version >= 2) |
984 | data.namlen = val; |
985 | else |
986 | bb_error_msg("warning: option namlen is not supported\n"); |
987 | break; |
988 | case 20: // "addr" - ignore |
989 | break; |
990 | default: |
991 | bb_error_msg("unknown nfs mount parameter: %s=%d", opt, val); |
992 | goto fail; |
993 | } |
994 | } |
995 | else { |
996 | const char *const options[] = { |
997 | "bg", |
998 | "fg", |
999 | "soft", |
1000 | "hard", |
1001 | "intr", |
1002 | "posix", |
1003 | "cto", |
1004 | "ac", |
1005 | "tcp", |
1006 | "udp", |
1007 | "lock", |
1008 | NULL |
1009 | }; |
1010 | int val = 1; |
1011 | if (!strncmp(opt, "no", 2)) { |
1012 | val = 0; |
1013 | opt += 2; |
1014 | } |
1015 | switch (index_in_str_array(options, opt)) { |
1016 | case 0: // "bg" |
1017 | bg = val; |
1018 | break; |
1019 | case 1: // "fg" |
1020 | bg = !val; |
1021 | break; |
1022 | case 2: // "soft" |
1023 | soft = val; |
1024 | break; |
1025 | case 3: // "hard" |
1026 | soft = !val; |
1027 | break; |
1028 | case 4: // "intr" |
1029 | intr = val; |
1030 | break; |
1031 | case 5: // "posix" |
1032 | posix = val; |
1033 | break; |
1034 | case 6: // "cto" |
1035 | nocto = !val; |
1036 | break; |
1037 | case 7: // "ac" |
1038 | noac = !val; |
1039 | break; |
1040 | case 8: // "tcp" |
1041 | tcp = val; |
1042 | break; |
1043 | case 9: // "udp" |
1044 | tcp = !val; |
1045 | break; |
1046 | case 10: // "lock" |
1047 | if (nfs_mount_version >= 3) |
1048 | nolock = !val; |
1049 | else |
1050 | bb_error_msg("warning: option nolock is not supported"); |
1051 | break; |
1052 | default: |
1053 | bb_error_msg("unknown nfs mount option: %s%s", val ? "" : "no", opt); |
1054 | goto fail; |
1055 | } |
1056 | } |
1057 | } |
1058 | proto = (tcp) ? IPPROTO_TCP : IPPROTO_UDP; |
1059 | |
1060 | data.flags = (soft ? NFS_MOUNT_SOFT : 0) |
1061 | | (intr ? NFS_MOUNT_INTR : 0) |
1062 | | (posix ? NFS_MOUNT_POSIX : 0) |
1063 | | (nocto ? NFS_MOUNT_NOCTO : 0) |
1064 | | (noac ? NFS_MOUNT_NOAC : 0); |
1065 | if (nfs_mount_version >= 2) |
1066 | data.flags |= (tcp ? NFS_MOUNT_TCP : 0); |
1067 | if (nfs_mount_version >= 3) |
1068 | data.flags |= (nolock ? NFS_MOUNT_NONLM : 0); |
1069 | if (nfsvers > MAX_NFSPROT || mountvers > MAX_NFSPROT) { |
1070 | bb_error_msg("NFSv%d not supported", nfsvers); |
1071 | goto fail; |
1072 | } |
1073 | if (nfsvers && !mountvers) |
1074 | mountvers = (nfsvers < 3) ? 1 : nfsvers; |
1075 | if (nfsvers && nfsvers < mountvers) { |
1076 | mountvers = nfsvers; |
1077 | } |
1078 | |
1079 | /* Adjust options if none specified */ |
1080 | if (!data.timeo) |
1081 | data.timeo = tcp ? 70 : 7; |
1082 | |
1083 | data.version = nfs_mount_version; |
1084 | |
1085 | if (vfsflags & MS_REMOUNT) |
1086 | goto do_mount; |
1087 | |
1088 | /* |
1089 | * If the previous mount operation on the same host was |
1090 | * backgrounded, and the "bg" for this mount is also set, |
1091 | * give up immediately, to avoid the initial timeout. |
1092 | */ |
1093 | if (bg && we_saw_this_host_before(hostname)) { |
1094 | daemonized = daemonize(); /* parent or error */ |
1095 | if (daemonized <= 0) { /* parent or error */ |
1096 | retval = -daemonized; |
1097 | goto ret; |
1098 | } |
1099 | } |
1100 | |
1101 | /* create mount daemon client */ |
1102 | /* See if the nfs host = mount host. */ |
1103 | if (mounthost) { |
1104 | if (mounthost[0] >= '0' && mounthost[0] <= '9') { |
1105 | mount_server_addr.sin_family = AF_INET; |
1106 | mount_server_addr.sin_addr.s_addr = inet_addr(hostname); |
1107 | } else { |
1108 | hp = gethostbyname(mounthost); |
1109 | if (hp == NULL) { |
1110 | bb_herror_msg("%s", mounthost); |
1111 | goto fail; |
1112 | } else { |
1113 | if (hp->h_length > sizeof(struct in_addr)) { |
1114 | bb_error_msg("got bad hp->h_length?"); |
1115 | hp->h_length = sizeof(struct in_addr); |
1116 | } |
1117 | mount_server_addr.sin_family = AF_INET; |
1118 | memcpy(&mount_server_addr.sin_addr, |
1119 | hp->h_addr, hp->h_length); |
1120 | } |
1121 | } |
1122 | } |
1123 | |
1124 | /* |
1125 | * The following loop implements the mount retries. When the mount |
1126 | * times out, and the "bg" option is set, we background ourself |
1127 | * and continue trying. |
1128 | * |
1129 | * The case where the mount point is not present and the "bg" |
1130 | * option is set, is treated as a timeout. This is done to |
1131 | * support nested mounts. |
1132 | * |
1133 | * The "retry" count specified by the user is the number of |
1134 | * minutes to retry before giving up. |
1135 | */ |
1136 | { |
1137 | struct timeval total_timeout; |
1138 | struct timeval retry_timeout; |
1139 | struct pmap* pm_mnt; |
1140 | time_t t; |
1141 | time_t prevt; |
1142 | time_t timeout; |
1143 | |
1144 | retry_timeout.tv_sec = 3; |
1145 | retry_timeout.tv_usec = 0; |
1146 | total_timeout.tv_sec = 20; |
1147 | total_timeout.tv_usec = 0; |
1148 | timeout = time(NULL) + 60 * retry; |
1149 | prevt = 0; |
1150 | t = 30; |
1151 | retry: |
1152 | /* be careful not to use too many CPU cycles */ |
1153 | if (t - prevt < 30) |
1154 | sleep(30); |
1155 | |
1156 | pm_mnt = get_mountport(&mount_server_addr, |
1157 | mountprog, |
1158 | mountvers, |
1159 | proto, |
1160 | mountport); |
1161 | nfsvers = (pm_mnt->pm_vers < 2) ? 2 : pm_mnt->pm_vers; |
1162 | |
1163 | /* contact the mount daemon via TCP */ |
1164 | mount_server_addr.sin_port = htons(pm_mnt->pm_port); |
1165 | msock = RPC_ANYSOCK; |
1166 | |
1167 | switch (pm_mnt->pm_prot) { |
1168 | case IPPROTO_UDP: |
1169 | mclient = clntudp_create(&mount_server_addr, |
1170 | pm_mnt->pm_prog, |
1171 | pm_mnt->pm_vers, |
1172 | retry_timeout, |
1173 | &msock); |
1174 | if (mclient) |
1175 | break; |
1176 | mount_server_addr.sin_port = htons(pm_mnt->pm_port); |
1177 | msock = RPC_ANYSOCK; |
1178 | case IPPROTO_TCP: |
1179 | mclient = clnttcp_create(&mount_server_addr, |
1180 | pm_mnt->pm_prog, |
1181 | pm_mnt->pm_vers, |
1182 | &msock, 0, 0); |
1183 | break; |
1184 | default: |
1185 | mclient = 0; |
1186 | } |
1187 | if (!mclient) { |
1188 | if (!daemonized && prevt == 0) |
1189 | error_msg_rpc(clnt_spcreateerror(" ")); |
1190 | } else { |
1191 | enum clnt_stat clnt_stat; |
1192 | /* try to mount hostname:pathname */ |
1193 | mclient->cl_auth = authunix_create_default(); |
1194 | |
1195 | /* make pointers in xdr_mountres3 NULL so |
1196 | * that xdr_array allocates memory for us |
1197 | */ |
1198 | memset(&status, 0, sizeof(status)); |
1199 | |
1200 | if (pm_mnt->pm_vers == 3) |
1201 | clnt_stat = clnt_call(mclient, MOUNTPROC3_MNT, |
1202 | (xdrproc_t) xdr_dirpath, |
1203 | (caddr_t) &pathname, |
1204 | (xdrproc_t) xdr_mountres3, |
1205 | (caddr_t) &status, |
1206 | total_timeout); |
1207 | else |
1208 | clnt_stat = clnt_call(mclient, MOUNTPROC_MNT, |
1209 | (xdrproc_t) xdr_dirpath, |
1210 | (caddr_t) &pathname, |
1211 | (xdrproc_t) xdr_fhstatus, |
1212 | (caddr_t) &status, |
1213 | total_timeout); |
1214 | |
1215 | if (clnt_stat == RPC_SUCCESS) |
1216 | goto prepare_kernel_data; /* we're done */ |
1217 | if (errno != ECONNREFUSED) { |
1218 | error_msg_rpc(clnt_sperror(mclient, " ")); |
1219 | goto fail; /* don't retry */ |
1220 | } |
1221 | /* Connection refused */ |
1222 | if (!daemonized && prevt == 0) /* print just once */ |
1223 | error_msg_rpc(clnt_sperror(mclient, " ")); |
1224 | auth_destroy(mclient->cl_auth); |
1225 | clnt_destroy(mclient); |
1226 | mclient = 0; |
1227 | close(msock); |
1228 | } |
1229 | |
1230 | /* Timeout. We are going to retry... maybe */ |
1231 | |
1232 | if (!bg) |
1233 | goto fail; |
1234 | if (!daemonized) { |
1235 | daemonized = daemonize(); |
1236 | if (daemonized <= 0) { /* parent or error */ |
1237 | retval = -daemonized; |
1238 | goto ret; |
1239 | } |
1240 | } |
1241 | prevt = t; |
1242 | t = time(NULL); |
1243 | if (t >= timeout) |
1244 | /* TODO error message */ |
1245 | goto fail; |
1246 | |
1247 | goto retry; |
1248 | } |
1249 | |
1250 | prepare_kernel_data: |
1251 | |
1252 | if (nfsvers == 2) { |
1253 | if (status.nfsv2.fhs_status != 0) { |
1254 | bb_error_msg("%s:%s failed, reason given by server: %s", |
1255 | hostname, pathname, |
1256 | nfs_strerror(status.nfsv2.fhs_status)); |
1257 | goto fail; |
1258 | } |
1259 | memcpy(data.root.data, |
1260 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
1261 | NFS_FHSIZE); |
1262 | data.root.size = NFS_FHSIZE; |
1263 | memcpy(data.old_root.data, |
1264 | (char *) status.nfsv2.fhstatus_u.fhs_fhandle, |
1265 | NFS_FHSIZE); |
1266 | } else { |
1267 | fhandle3 *my_fhandle; |
1268 | if (status.nfsv3.fhs_status != 0) { |
1269 | bb_error_msg("%s:%s failed, reason given by server: %s", |
1270 | hostname, pathname, |
1271 | nfs_strerror(status.nfsv3.fhs_status)); |
1272 | goto fail; |
1273 | } |
1274 | my_fhandle = &status.nfsv3.mountres3_u.mountinfo.fhandle; |
1275 | memset(data.old_root.data, 0, NFS_FHSIZE); |
1276 | memset(&data.root, 0, sizeof(data.root)); |
1277 | data.root.size = my_fhandle->fhandle3_len; |
1278 | memcpy(data.root.data, |
1279 | (char *) my_fhandle->fhandle3_val, |
1280 | my_fhandle->fhandle3_len); |
1281 | |
1282 | data.flags |= NFS_MOUNT_VER3; |
1283 | } |
1284 | |
1285 | /* create nfs socket for kernel */ |
1286 | |
1287 | if (tcp) { |
1288 | if (nfs_mount_version < 3) { |
1289 | bb_error_msg("NFS over TCP is not supported"); |
1290 | goto fail; |
1291 | } |
1292 | fsock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
1293 | } else |
1294 | fsock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1295 | if (fsock < 0) { |
1296 | bb_perror_msg("nfs socket"); |
1297 | goto fail; |
1298 | } |
1299 | if (bindresvport(fsock, 0) < 0) { |
1300 | bb_perror_msg("nfs bindresvport"); |
1301 | goto fail; |
1302 | } |
1303 | if (port == 0) { |
1304 | server_addr.sin_port = PMAPPORT; |
1305 | port = pmap_getport(&server_addr, nfsprog, nfsvers, |
1306 | tcp ? IPPROTO_TCP : IPPROTO_UDP); |
1307 | if (port == 0) |
1308 | port = NFS_PORT; |
1309 | } |
1310 | server_addr.sin_port = htons(port); |
1311 | |
1312 | /* prepare data structure for kernel */ |
1313 | |
1314 | data.fd = fsock; |
1315 | memcpy((char *) &data.addr, (char *) &server_addr, sizeof(data.addr)); |
1316 | strncpy(data.hostname, hostname, sizeof(data.hostname)); |
1317 | |
1318 | /* clean up */ |
1319 | |
1320 | auth_destroy(mclient->cl_auth); |
1321 | clnt_destroy(mclient); |
1322 | close(msock); |
1323 | |
1324 | if (bg) { |
1325 | /* We must wait until mount directory is available */ |
1326 | struct stat statbuf; |
1327 | int delay = 1; |
1328 | while (stat(mp->mnt_dir, &statbuf) == -1) { |
1329 | if (!daemonized) { |
1330 | daemonized = daemonize(); |
1331 | if (daemonized <= 0) { /* parent or error */ |
1332 | retval = -daemonized; |
1333 | goto ret; |
1334 | } |
1335 | } |
1336 | sleep(delay); /* 1, 2, 4, 8, 16, 30, ... */ |
1337 | delay *= 2; |
1338 | if (delay > 30) |
1339 | delay = 30; |
1340 | } |
1341 | } |
1342 | |
1343 | do_mount: /* perform actual mount */ |
1344 | |
1345 | mp->mnt_type = "nfs"; |
1346 | retval = mount_it_now(mp, vfsflags, (char*)&data); |
1347 | goto ret; |
1348 | |
1349 | fail: /* abort */ |
1350 | |
1351 | if (msock != -1) { |
1352 | if (mclient) { |
1353 | auth_destroy(mclient->cl_auth); |
1354 | clnt_destroy(mclient); |
1355 | } |
1356 | close(msock); |
1357 | } |
1358 | if (fsock != -1) |
1359 | close(fsock); |
1360 | |
1361 | ret: |
1362 | free(hostname); |
1363 | free(mounthost); |
1364 | free(filteropts); |
1365 | return retval; |
1366 | } |
1367 | |
1368 | #else /* !ENABLE_FEATURE_MOUNT_NFS */ |
1369 | |
1370 | /* Never called. Call should be optimized out. */ |
1371 | int nfsmount(struct mntent *mp, int vfsflags, char *filteropts); |
1372 | |
1373 | #endif /* !ENABLE_FEATURE_MOUNT_NFS */ |
1374 | |
1375 | // Mount one directory. Handles CIFS, NFS, loopback, autobind, and filesystem |
1376 | // type detection. Returns 0 for success, nonzero for failure. |
1377 | // NB: mp->xxx fields may be trashed on exit |
1378 | static int singlemount(struct mntent *mp, int ignore_busy) |
1379 | { |
1380 | int rc = -1, vfsflags; |
1381 | char *loopFile = 0, *filteropts = 0; |
1382 | llist_t *fl = 0; |
1383 | struct stat st; |
1384 | |
1385 | vfsflags = parse_mount_options(mp->mnt_opts, &filteropts); |
1386 | |
1387 | // Treat fstype "auto" as unspecified. |
1388 | |
1389 | if (mp->mnt_type && !strcmp(mp->mnt_type,"auto")) mp->mnt_type = 0; |
1390 | |
1391 | // Might this be an CIFS filesystem? |
1392 | |
1393 | if (ENABLE_FEATURE_MOUNT_CIFS && |
1394 | (!mp->mnt_type || !strcmp(mp->mnt_type,"cifs")) && |
1395 | (mp->mnt_fsname[0]==mp->mnt_fsname[1] && (mp->mnt_fsname[0]=='/' || mp->mnt_fsname[0]=='\\'))) |
1396 | { |
1397 | struct hostent *he; |
1398 | char ip[32], *s; |
1399 | |
1400 | rc = 1; |
1401 | // Replace '/' with '\' and verify that unc points to "//server/share". |
1402 | |
1403 | for (s = mp->mnt_fsname; *s; ++s) |
1404 | if (*s == '/') *s = '\\'; |
1405 | |
1406 | // get server IP |
1407 | |
1408 | s = strrchr(mp->mnt_fsname, '\\'); |
1409 | if (s == mp->mnt_fsname+1) goto report_error; |
1410 | *s = 0; |
1411 | he = gethostbyname(mp->mnt_fsname+2); |
1412 | *s = '\\'; |
1413 | if (!he) goto report_error; |
1414 | |
1415 | // Insert ip=... option into string flags. (NOTE: Add IPv6 support.) |
1416 | |
1417 | sprintf(ip, "ip=%d.%d.%d.%d", he->h_addr[0], he->h_addr[1], |
1418 | he->h_addr[2], he->h_addr[3]); |
1419 | parse_mount_options(ip, &filteropts); |
1420 | |
1421 | // compose new unc '\\server-ip\share' |
1422 | |
1423 | mp->mnt_fsname = xasprintf("\\\\%s%s", ip+3, |
1424 | strchr(mp->mnt_fsname+2,'\\')); |
1425 | |
1426 | // lock is required |
1427 | vfsflags |= MS_MANDLOCK; |
1428 | |
1429 | mp->mnt_type = "cifs"; |
1430 | rc = mount_it_now(mp, vfsflags, filteropts); |
1431 | if (ENABLE_FEATURE_CLEAN_UP) free(mp->mnt_fsname); |
1432 | goto report_error; |
1433 | } |
1434 | |
1435 | // Might this be an NFS filesystem? |
1436 | |
1437 | if (ENABLE_FEATURE_MOUNT_NFS && |
1438 | (!mp->mnt_type || !strcmp(mp->mnt_type,"nfs")) && |
1439 | strchr(mp->mnt_fsname, ':') != NULL) |
1440 | { |
1441 | rc = nfsmount(mp, vfsflags, filteropts); |
1442 | goto report_error; |
1443 | } |
1444 | |
1445 | // Look at the file. (Not found isn't a failure for remount, or for |
1446 | // a synthetic filesystem like proc or sysfs.) |
1447 | |
1448 | if (!lstat(mp->mnt_fsname, &st) && !(vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) |
1449 | { |
1450 | // Do we need to allocate a loopback device for it? |
1451 | |
1452 | if (ENABLE_FEATURE_MOUNT_LOOP && S_ISREG(st.st_mode)) { |
1453 | loopFile = bb_simplify_path(mp->mnt_fsname); |
1454 | mp->mnt_fsname = 0; |
1455 | switch (set_loop(&(mp->mnt_fsname), loopFile, 0)) { |
1456 | case 0: |
1457 | case 1: |
1458 | break; |
1459 | default: |
1460 | bb_error_msg( errno == EPERM || errno == EACCES |
1461 | ? bb_msg_perm_denied_are_you_root |
1462 | : "cannot setup loop device"); |
1463 | return errno; |
1464 | } |
1465 | |
1466 | // Autodetect bind mounts |
1467 | |
1468 | } else if (S_ISDIR(st.st_mode) && !mp->mnt_type) |
1469 | vfsflags |= MS_BIND; |
1470 | } |
1471 | |
1472 | /* If we know the fstype (or don't need to), jump straight |
1473 | * to the actual mount. */ |
1474 | |
1475 | if (mp->mnt_type || (vfsflags & (MS_REMOUNT | MS_BIND | MS_MOVE))) |
1476 | rc = mount_it_now(mp, vfsflags, filteropts); |
1477 | |
1478 | // Loop through filesystem types until mount succeeds or we run out |
1479 | |
1480 | else { |
1481 | |
1482 | /* Initialize list of block backed filesystems. This has to be |
1483 | * done here so that during "mount -a", mounts after /proc shows up |
1484 | * can autodetect. */ |
1485 | |
1486 | if (!fslist) { |
1487 | fslist = get_block_backed_filesystems(); |
1488 | if (ENABLE_FEATURE_CLEAN_UP && fslist) |
1489 | atexit(delete_block_backed_filesystems); |
1490 | } |
1491 | |
1492 | for (fl = fslist; fl; fl = fl->link) { |
1493 | mp->mnt_type = fl->data; |
1494 | rc = mount_it_now(mp, vfsflags, filteropts); |
1495 | if (!rc) break; |
1496 | } |
1497 | } |
1498 | |
1499 | // If mount failed, clean up loop file (if any). |
1500 | |
1501 | if (ENABLE_FEATURE_MOUNT_LOOP && rc && loopFile) { |
1502 | del_loop(mp->mnt_fsname); |
1503 | if (ENABLE_FEATURE_CLEAN_UP) { |
1504 | free(loopFile); |
1505 | free(mp->mnt_fsname); |
1506 | } |
1507 | } |
1508 | |
1509 | report_error: |
1510 | if (ENABLE_FEATURE_CLEAN_UP) free(filteropts); |
1511 | |
1512 | if (rc && errno == EBUSY && ignore_busy) rc = 0; |
1513 | if (rc < 0) |
1514 | /* perror here sometimes says "mounting ... on ... failed: Success" */ |
1515 | bb_error_msg("mounting %s on %s failed", mp->mnt_fsname, mp->mnt_dir); |
1516 | |
1517 | return rc; |
1518 | } |
1519 | |
1520 | // Parse options, if necessary parse fstab/mtab, and call singlemount for |
1521 | // each directory to be mounted. |
1522 | |
1523 | const char must_be_root[] = "you must be root"; |
1524 | |
1525 | int mount_main(int argc, char **argv) |
1526 | { |
1527 | enum { OPT_ALL = 0x10 }; |
1528 | |
1529 | char *cmdopts = xstrdup(""), *fstype=0, *storage_path=0; |
1530 | char *opt_o; |
1531 | const char *fstabname; |
1532 | FILE *fstab; |
1533 | int i, j, rc = 0; |
1534 | unsigned opt; |
1535 | struct mntent mtpair[2], *mtcur = mtpair; |
1536 | SKIP_DESKTOP(const int nonroot = 0;) |
1537 | USE_DESKTOP( int nonroot = (getuid() != 0);) |
1538 | |
1539 | /* parse long options, like --bind and --move. Note that -o option |
1540 | * and --option are synonymous. Yes, this means --remount,rw works. */ |
1541 | |
1542 | for (i = j = 0; i < argc; i++) { |
1543 | if (argv[i][0] == '-' && argv[i][1] == '-') { |
1544 | append_mount_options(&cmdopts, argv[i]+2); |
1545 | } else argv[j++] = argv[i]; |
1546 | } |
1547 | argv[j] = 0; |
1548 | argc = j; |
1549 | |
1550 | // Parse remaining options |
1551 | |
1552 | opt = getopt32(argc, argv, "o:t:rwanfvs", &opt_o, &fstype); |
1553 | if (opt & 0x1) append_mount_options(&cmdopts, opt_o); // -o |
1554 | //if (opt & 0x2) // -t |
1555 | if (opt & 0x4) append_mount_options(&cmdopts, "ro"); // -r |
1556 | if (opt & 0x8) append_mount_options(&cmdopts, "rw"); // -w |
1557 | //if (opt & 0x10) // -a |
1558 | if (opt & 0x20) USE_FEATURE_MTAB_SUPPORT(useMtab = 0); // -n |
1559 | if (opt & 0x40) USE_FEATURE_MTAB_SUPPORT(fakeIt = 1); // -f |
1560 | //if (opt & 0x80) // -v: verbose (ignore) |
1561 | //if (opt & 0x100) // -s: sloppy (ignore) |
1562 | argv += optind; |
1563 | argc -= optind; |
1564 | |
1565 | // Three or more non-option arguments? Die with a usage message. |
1566 | |
1567 | if (argc > 2) bb_show_usage(); |
1568 | |
1569 | // If we have no arguments, show currently mounted filesystems |
1570 | |
1571 | if (!argc) { |
1572 | if (!(opt & OPT_ALL)) { |
1573 | FILE *mountTable = setmntent(bb_path_mtab_file, "r"); |
1574 | |
1575 | if (!mountTable) bb_error_msg_and_die("no %s", bb_path_mtab_file); |
1576 | |
1577 | while (getmntent_r(mountTable, mtpair, bb_common_bufsiz1, |
1578 | sizeof(bb_common_bufsiz1))) |
1579 | { |
1580 | // Don't show rootfs. FIXME: why?? |
1581 | // util-linux 2.12a happily shows rootfs... |
1582 | //if (!strcmp(mtpair->mnt_fsname, "rootfs")) continue; |
1583 | |
1584 | if (!fstype || !strcmp(mtpair->mnt_type, fstype)) |
1585 | printf("%s on %s type %s (%s)\n", mtpair->mnt_fsname, |
1586 | mtpair->mnt_dir, mtpair->mnt_type, |
1587 | mtpair->mnt_opts); |
1588 | } |
1589 | if (ENABLE_FEATURE_CLEAN_UP) endmntent(mountTable); |
1590 | return EXIT_SUCCESS; |
1591 | } |
1592 | } else storage_path = bb_simplify_path(argv[0]); |
1593 | |
1594 | // When we have two arguments, the second is the directory and we can |
1595 | // skip looking at fstab entirely. We can always abspath() the directory |
1596 | // argument when we get it. |
1597 | |
1598 | if (argc == 2) { |
1599 | if (nonroot) |
1600 | bb_error_msg_and_die(must_be_root); |
1601 | mtpair->mnt_fsname = argv[0]; |
1602 | mtpair->mnt_dir = argv[1]; |
1603 | mtpair->mnt_type = fstype; |
1604 | mtpair->mnt_opts = cmdopts; |
1605 | rc = singlemount(mtpair, 0); |
1606 | goto clean_up; |
1607 | } |
1608 | |
1609 | i = parse_mount_options(cmdopts, 0); |
1610 | if (nonroot && (i & ~MS_SILENT)) // Non-root users cannot specify flags |
1611 | bb_error_msg_and_die(must_be_root); |
1612 | |
1613 | // If we have a shared subtree flag, don't worry about fstab or mtab. |
1614 | |
1615 | if (ENABLE_FEATURE_MOUNT_FLAGS && |
1616 | (i & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))) |
1617 | { |
1618 | rc = mount("", argv[0], "", i, ""); |
1619 | if (rc) bb_perror_msg_and_die("%s", argv[0]); |
1620 | goto clean_up; |
1621 | } |
1622 | |
1623 | // Open either fstab or mtab |
1624 | |
1625 | fstabname = "/etc/fstab"; |
1626 | if (i & MS_REMOUNT) { |
1627 | fstabname = bb_path_mtab_file; |
1628 | } |
1629 | fstab = setmntent(fstabname, "r"); |
1630 | if (!fstab) |
1631 | bb_perror_msg_and_die("cannot read %s", fstabname); |
1632 | |
1633 | // Loop through entries until we find what we're looking for. |
1634 | |
1635 | memset(mtpair, 0, sizeof(mtpair)); |
1636 | for (;;) { |
1637 | struct mntent *mtnext = (mtcur==mtpair ? mtpair+1 : mtpair); |
1638 | |
1639 | // Get next fstab entry |
1640 | |
1641 | if (!getmntent_r(fstab, mtcur, bb_common_bufsiz1 |
1642 | + (mtcur==mtpair ? sizeof(bb_common_bufsiz1)/2 : 0), |
1643 | sizeof(bb_common_bufsiz1)/2)) |
1644 | { |
1645 | // Were we looking for something specific? |
1646 | |
1647 | if (argc) { |
1648 | |
1649 | // If we didn't find anything, complain. |
1650 | |
1651 | if (!mtnext->mnt_fsname) |
1652 | bb_error_msg_and_die("can't find %s in %s", |
1653 | argv[0], fstabname); |
1654 | |
1655 | mtcur = mtnext; |
1656 | if (nonroot) { |
1657 | // fstab must have "users" or "user" |
1658 | if (!(parse_mount_options(mtcur->mnt_opts, 0) & MOUNT_USERS)) |
1659 | bb_error_msg_and_die(must_be_root); |
1660 | } |
1661 | |
1662 | // Mount the last thing we found. |
1663 | |
1664 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
1665 | append_mount_options(&(mtcur->mnt_opts), cmdopts); |
1666 | rc = singlemount(mtcur, 0); |
1667 | free(mtcur->mnt_opts); |
1668 | } |
1669 | goto clean_up; |
1670 | } |
1671 | |
1672 | /* If we're trying to mount something specific and this isn't it, |
1673 | * skip it. Note we must match both the exact text in fstab (ala |
1674 | * "proc") or a full path from root */ |
1675 | |
1676 | if (argc) { |
1677 | |
1678 | // Is this what we're looking for? |
1679 | |
1680 | if (strcmp(argv[0], mtcur->mnt_fsname) && |
1681 | strcmp(storage_path, mtcur->mnt_fsname) && |
1682 | strcmp(argv[0], mtcur->mnt_dir) && |
1683 | strcmp(storage_path, mtcur->mnt_dir)) continue; |
1684 | |
1685 | // Remember this entry. Something later may have overmounted |
1686 | // it, and we want the _last_ match. |
1687 | |
1688 | mtcur = mtnext; |
1689 | |
1690 | // If we're mounting all. |
1691 | |
1692 | } else { |
1693 | // Do we need to match a filesystem type? |
1694 | // TODO: support "-t type1,type2"; "-t notype1,type2" |
1695 | |
1696 | if (fstype && strcmp(mtcur->mnt_type, fstype)) continue; |
1697 | |
1698 | // Skip noauto and swap anyway. |
1699 | |
1700 | if (parse_mount_options(mtcur->mnt_opts, 0) |
1701 | & (MOUNT_NOAUTO | MOUNT_SWAP)) continue; |
1702 | |
1703 | // No, mount -a won't mount anything, |
1704 | // even user mounts, for mere humans. |
1705 | |
1706 | if (nonroot) |
1707 | bb_error_msg_and_die(must_be_root); |
1708 | |
1709 | // Mount this thing. |
1710 | |
1711 | // NFS mounts want this to be xrealloc-able |
1712 | mtcur->mnt_opts = xstrdup(mtcur->mnt_opts); |
1713 | if (singlemount(mtcur, 1)) { |
1714 | /* Count number of failed mounts */ |
1715 | rc++; |
1716 | } |
1717 | free(mtcur->mnt_opts); |
1718 | } |
1719 | } |
1720 | if (ENABLE_FEATURE_CLEAN_UP) endmntent(fstab); |
1721 | |
1722 | clean_up: |
1723 | |
1724 | if (ENABLE_FEATURE_CLEAN_UP) { |
1725 | free(storage_path); |
1726 | free(cmdopts); |
1727 | } |
1728 | |
1729 | return rc; |
1730 | } |