source: MondoRescue/branches/3.2/mindi-busybox/modutils/modprobe-small.c@ 3186

Last change on this file since 3186 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
  • Property svn:eol-style set to native
File size: 24.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * simplified modprobe
4 *
5 * Copyright (c) 2008 Vladimir Dronnikov
6 * Copyright (c) 2008 Bernhard Reutner-Fischer (initial depmod code)
7 *
8 * Licensed under GPLv2, see file LICENSE in this source tree.
9 */
10
11//applet:IF_MODPROBE_SMALL(APPLET(modprobe, _BB_DIR_SBIN, _BB_SUID_DROP))
12//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(depmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
13//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(insmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
14//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(lsmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
15//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(rmmod, modprobe, _BB_DIR_SBIN, _BB_SUID_DROP, modprobe))
16
17#include "libbb.h"
18/* After libbb.h, since it needs sys/types.h on some systems */
19#include <sys/utsname.h> /* uname() */
20#include <fnmatch.h>
21
22extern int init_module(void *module, unsigned long len, const char *options);
23extern int delete_module(const char *module, unsigned flags);
24extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
25
26
27#if 1
28# define dbg1_error_msg(...) ((void)0)
29# define dbg2_error_msg(...) ((void)0)
30#else
31# define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
32# define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
33#endif
34
35#define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb"
36
37enum {
38 OPT_q = (1 << 0), /* be quiet */
39 OPT_r = (1 << 1), /* module removal instead of loading */
40};
41
42typedef struct module_info {
43 char *pathname;
44 char *aliases;
45 char *deps;
46} module_info;
47
48/*
49 * GLOBALS
50 */
51struct globals {
52 module_info *modinfo;
53 char *module_load_options;
54 smallint dep_bb_seen;
55 smallint wrote_dep_bb_ok;
56 unsigned module_count;
57 int module_found_idx;
58 unsigned stringbuf_idx;
59 unsigned stringbuf_size;
60 char *stringbuf; /* some modules have lots of stuff */
61 /* for example, drivers/media/video/saa7134/saa7134.ko */
62 /* therefore having a fixed biggish buffer is not wise */
63};
64#define G (*ptr_to_globals)
65#define modinfo (G.modinfo )
66#define dep_bb_seen (G.dep_bb_seen )
67#define wrote_dep_bb_ok (G.wrote_dep_bb_ok )
68#define module_count (G.module_count )
69#define module_found_idx (G.module_found_idx )
70#define module_load_options (G.module_load_options)
71#define stringbuf_idx (G.stringbuf_idx )
72#define stringbuf_size (G.stringbuf_size )
73#define stringbuf (G.stringbuf )
74#define INIT_G() do { \
75 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
76} while (0)
77
78static void append(const char *s)
79{
80 unsigned len = strlen(s);
81 if (stringbuf_idx + len + 15 > stringbuf_size) {
82 stringbuf_size = stringbuf_idx + len + 127;
83 dbg2_error_msg("grow stringbuf to %u", stringbuf_size);
84 stringbuf = xrealloc(stringbuf, stringbuf_size);
85 }
86 memcpy(stringbuf + stringbuf_idx, s, len);
87 stringbuf_idx += len;
88}
89
90static void appendc(char c)
91{
92 /* We appendc() only after append(), + 15 trick in append()
93 * makes it unnecessary to check for overflow here */
94 stringbuf[stringbuf_idx++] = c;
95}
96
97static void bksp(void)
98{
99 if (stringbuf_idx)
100 stringbuf_idx--;
101}
102
103static void reset_stringbuf(void)
104{
105 stringbuf_idx = 0;
106}
107
108static char* copy_stringbuf(void)
109{
110 char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */
111 return memcpy(copy, stringbuf, stringbuf_idx);
112}
113
114static char* find_keyword(char *ptr, size_t len, const char *word)
115{
116 int wlen;
117
118 if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */
119 return NULL;
120
121 wlen = strlen(word);
122 len -= wlen - 1;
123 while ((ssize_t)len > 0) {
124 char *old = ptr;
125 /* search for the first char in word */
126 ptr = memchr(ptr, *word, len);
127 if (ptr == NULL) /* no occurance left, done */
128 break;
129 if (strncmp(ptr, word, wlen) == 0)
130 return ptr + wlen; /* found, return ptr past it */
131 ++ptr;
132 len -= (ptr - old);
133 }
134 return NULL;
135}
136
137static void replace(char *s, char what, char with)
138{
139 while (*s) {
140 if (what == *s)
141 *s = with;
142 ++s;
143 }
144}
145
146/* Take "word word", return malloced "word",NUL,"word",NUL,NUL */
147static char* str_2_list(const char *str)
148{
149 int len = strlen(str) + 1;
150 char *dst = xmalloc(len + 1);
151
152 dst[len] = '\0';
153 memcpy(dst, str, len);
154//TODO: protect against 2+ spaces: "word word"
155 replace(dst, ' ', '\0');
156 return dst;
157}
158
159/* We use error numbers in a loose translation... */
160static const char *moderror(int err)
161{
162 switch (err) {
163 case ENOEXEC:
164 return "invalid module format";
165 case ENOENT:
166 return "unknown symbol in module or invalid parameter";
167 case ESRCH:
168 return "module has wrong symbol version";
169 case EINVAL: /* "invalid parameter" */
170 return "unknown symbol in module or invalid parameter"
171 + sizeof("unknown symbol in module or");
172 default:
173 return strerror(err);
174 }
175}
176
177static int load_module(const char *fname, const char *options)
178{
179#if 1
180 int r;
181 size_t len = MAXINT(ssize_t);
182 char *module_image;
183 dbg1_error_msg("load_module('%s','%s')", fname, options);
184
185 module_image = xmalloc_open_zipped_read_close(fname, &len);
186 r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
187 free(module_image);
188 dbg1_error_msg("load_module:%d", r);
189 return r; /* 0 = success */
190#else
191 /* For testing */
192 dbg1_error_msg("load_module('%s','%s')", fname, options);
193 return 1;
194#endif
195}
196
197static void parse_module(module_info *info, const char *pathname)
198{
199 char *module_image;
200 char *ptr;
201 size_t len;
202 size_t pos;
203 dbg1_error_msg("parse_module('%s')", pathname);
204
205 /* Read (possibly compressed) module */
206 len = 64 * 1024 * 1024; /* 64 Mb at most */
207 module_image = xmalloc_open_zipped_read_close(pathname, &len);
208 /* module_image == NULL is ok here, find_keyword handles it */
209//TODO: optimize redundant module body reads
210
211 /* "alias1 symbol:sym1 alias2 symbol:sym2" */
212 reset_stringbuf();
213 pos = 0;
214 while (1) {
215 ptr = find_keyword(module_image + pos, len - pos, "alias=");
216 if (!ptr) {
217 ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
218 if (!ptr)
219 break;
220 /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
221 * in many modules. What do they mean? */
222 if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0)
223 goto skip;
224 dbg2_error_msg("alias:'symbol:%s'", ptr);
225 append("symbol:");
226 } else {
227 dbg2_error_msg("alias:'%s'", ptr);
228 }
229 append(ptr);
230 appendc(' ');
231 skip:
232 pos = (ptr - module_image);
233 }
234 bksp(); /* remove last ' ' */
235 info->aliases = copy_stringbuf();
236 replace(info->aliases, '-', '_');
237
238 /* "dependency1 depandency2" */
239 reset_stringbuf();
240 ptr = find_keyword(module_image, len, "depends=");
241 if (ptr && *ptr) {
242 replace(ptr, ',', ' ');
243 replace(ptr, '-', '_');
244 dbg2_error_msg("dep:'%s'", ptr);
245 append(ptr);
246 }
247 info->deps = copy_stringbuf();
248
249 free(module_image);
250}
251
252static int pathname_matches_modname(const char *pathname, const char *modname)
253{
254 const char *fname = bb_get_last_path_component_nostrip(pathname);
255 const char *suffix = strrstr(fname, ".ko");
256//TODO: can do without malloc?
257 char *name = xstrndup(fname, suffix - fname);
258 int r;
259 replace(name, '-', '_');
260 r = (strcmp(name, modname) == 0);
261 free(name);
262 return r;
263}
264
265static FAST_FUNC int fileAction(const char *pathname,
266 struct stat *sb UNUSED_PARAM,
267 void *modname_to_match,
268 int depth UNUSED_PARAM)
269{
270 int cur;
271 const char *fname;
272
273 pathname += 2; /* skip "./" */
274 fname = bb_get_last_path_component_nostrip(pathname);
275 if (!strrstr(fname, ".ko")) {
276 dbg1_error_msg("'%s' is not a module", pathname);
277 return TRUE; /* not a module, continue search */
278 }
279
280 cur = module_count++;
281 modinfo = xrealloc_vector(modinfo, 12, cur);
282 modinfo[cur].pathname = xstrdup(pathname);
283 /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */
284 /*modinfo[cur+1].pathname = NULL;*/
285
286 if (!pathname_matches_modname(fname, modname_to_match)) {
287 dbg1_error_msg("'%s' module name doesn't match", pathname);
288 return TRUE; /* module name doesn't match, continue search */
289 }
290
291 dbg1_error_msg("'%s' module name matches", pathname);
292 module_found_idx = cur;
293 parse_module(&modinfo[cur], pathname);
294
295 if (!(option_mask32 & OPT_r)) {
296 if (load_module(pathname, module_load_options) == 0) {
297 /* Load was successful, there is nothing else to do.
298 * This can happen ONLY for "top-level" module load,
299 * not a dep, because deps dont do dirscan. */
300 exit(EXIT_SUCCESS);
301 }
302 }
303
304 return TRUE;
305}
306
307static int load_dep_bb(void)
308{
309 char *line;
310 FILE *fp = fopen_for_read(DEPFILE_BB);
311
312 if (!fp)
313 return 0;
314
315 dep_bb_seen = 1;
316 dbg1_error_msg("loading "DEPFILE_BB);
317
318 /* Why? There is a rare scenario: we did not find modprobe.dep.bb,
319 * we scanned the dir and found no module by name, then we search
320 * for alias (full scan), and we decided to generate modprobe.dep.bb.
321 * But we see modprobe.dep.bb.new! Other modprobe is at work!
322 * We wait and other modprobe renames it to modprobe.dep.bb.
323 * Now we can use it.
324 * But we already have modinfo[] filled, and "module_count = 0"
325 * makes us start anew. Yes, we leak modinfo[].xxx pointers -
326 * there is not much of data there anyway. */
327 module_count = 0;
328 memset(&modinfo[0], 0, sizeof(modinfo[0]));
329
330 while ((line = xmalloc_fgetline(fp)) != NULL) {
331 char* space;
332 char* linebuf;
333 int cur;
334
335 if (!line[0]) {
336 free(line);
337 continue;
338 }
339 space = strchrnul(line, ' ');
340 cur = module_count++;
341 modinfo = xrealloc_vector(modinfo, 12, cur);
342 /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */
343 modinfo[cur].pathname = line; /* we take ownership of malloced block here */
344 if (*space)
345 *space++ = '\0';
346 modinfo[cur].aliases = space;
347 linebuf = xmalloc_fgetline(fp);
348 modinfo[cur].deps = linebuf ? linebuf : xzalloc(1);
349 if (modinfo[cur].deps[0]) {
350 /* deps are not "", so next line must be empty */
351 line = xmalloc_fgetline(fp);
352 /* Refuse to work with damaged config file */
353 if (line && line[0])
354 bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line);
355 free(line);
356 }
357 }
358 return 1;
359}
360
361static int start_dep_bb_writeout(void)
362{
363 int fd;
364
365 /* depmod -n: write result to stdout */
366 if (applet_name[0] == 'd' && (option_mask32 & 1))
367 return STDOUT_FILENO;
368
369 fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
370 if (fd < 0) {
371 if (errno == EEXIST) {
372 int count = 5 * 20;
373 dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB);
374 while (1) {
375 usleep(1000*1000 / 20);
376 if (load_dep_bb()) {
377 dbg1_error_msg(DEPFILE_BB" appeared");
378 return -2; /* magic number */
379 }
380 if (!--count)
381 break;
382 }
383 bb_error_msg("deleting stale %s", DEPFILE_BB".new");
384 fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC);
385 }
386 }
387 dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd);
388 return fd;
389}
390
391static void write_out_dep_bb(int fd)
392{
393 int i;
394 FILE *fp;
395
396 /* We want good error reporting. fdprintf is not good enough. */
397 fp = xfdopen_for_write(fd);
398 i = 0;
399 while (modinfo[i].pathname) {
400 fprintf(fp, "%s%s%s\n" "%s%s\n",
401 modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases,
402 modinfo[i].deps, modinfo[i].deps[0] ? "\n" : "");
403 i++;
404 }
405 /* Badly formatted depfile is a no-no. Be paranoid. */
406 errno = 0;
407 if (ferror(fp) | fclose(fp)) /* | instead of || is intended */
408 goto err;
409
410 if (fd == STDOUT_FILENO) /* it was depmod -n */
411 goto ok;
412
413 if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) {
414 err:
415 bb_perror_msg("can't create '%s'", DEPFILE_BB);
416 unlink(DEPFILE_BB".new");
417 } else {
418 ok:
419 wrote_dep_bb_ok = 1;
420 dbg1_error_msg("created "DEPFILE_BB);
421 }
422}
423
424static module_info* find_alias(const char *alias)
425{
426 int i;
427 int dep_bb_fd;
428 module_info *result;
429 dbg1_error_msg("find_alias('%s')", alias);
430
431 try_again:
432 /* First try to find by name (cheaper) */
433 i = 0;
434 while (modinfo[i].pathname) {
435 if (pathname_matches_modname(modinfo[i].pathname, alias)) {
436 dbg1_error_msg("found '%s' in module '%s'",
437 alias, modinfo[i].pathname);
438 if (!modinfo[i].aliases) {
439 parse_module(&modinfo[i], modinfo[i].pathname);
440 }
441 return &modinfo[i];
442 }
443 i++;
444 }
445
446 /* Ok, we definitely have to scan module bodies. This is a good
447 * moment to generate modprobe.dep.bb, if it does not exist yet */
448 dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout();
449 if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */
450 goto try_again;
451
452 /* Scan all module bodies, extract modinfo (it contains aliases) */
453 i = 0;
454 result = NULL;
455 while (modinfo[i].pathname) {
456 char *desc, *s;
457 if (!modinfo[i].aliases) {
458 parse_module(&modinfo[i], modinfo[i].pathname);
459 }
460 if (result) {
461 i++;
462 continue;
463 }
464 /* "alias1 symbol:sym1 alias2 symbol:sym2" */
465 desc = str_2_list(modinfo[i].aliases);
466 /* Does matching substring exist? */
467 for (s = desc; *s; s += strlen(s) + 1) {
468 /* Aliases in module bodies can be defined with
469 * shell patterns. Example:
470 * "pci:v000010DEd000000D9sv*sd*bc*sc*i*".
471 * Plain strcmp() won't catch that */
472 if (fnmatch(s, alias, 0) == 0) {
473 dbg1_error_msg("found alias '%s' in module '%s'",
474 alias, modinfo[i].pathname);
475 result = &modinfo[i];
476 break;
477 }
478 }
479 free(desc);
480 if (result && dep_bb_fd < 0)
481 return result;
482 i++;
483 }
484
485 /* Create module.dep.bb if needed */
486 if (dep_bb_fd >= 0) {
487 write_out_dep_bb(dep_bb_fd);
488 }
489
490 dbg1_error_msg("find_alias '%s' returns %p", alias, result);
491 return result;
492}
493
494#if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
495// TODO: open only once, invent config_rewind()
496static int already_loaded(const char *name)
497{
498 int ret = 0;
499 char *s;
500 parser_t *parser = config_open2("/proc/modules", xfopen_for_read);
501 while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
502 if (strcmp(s, name) == 0) {
503 ret = 1;
504 break;
505 }
506 }
507 config_close(parser);
508 return ret;
509}
510#else
511#define already_loaded(name) is_rmmod
512#endif
513
514/*
515 * Given modules definition and module name (or alias, or symbol)
516 * load/remove the module respecting dependencies.
517 * NB: also called by depmod with bogus name "/",
518 * just in order to force modprobe.dep.bb creation.
519*/
520#if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
521#define process_module(a,b) process_module(a)
522#define cmdline_options ""
523#endif
524static void process_module(char *name, const char *cmdline_options)
525{
526 char *s, *deps, *options;
527 module_info *info;
528 int is_rmmod = (option_mask32 & OPT_r) != 0;
529 dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
530
531 replace(name, '-', '_');
532
533 dbg1_error_msg("already_loaded:%d is_rmmod:%d", already_loaded(name), is_rmmod);
534 if (already_loaded(name) != is_rmmod) {
535 dbg1_error_msg("nothing to do for '%s'", name);
536 return;
537 }
538
539 options = NULL;
540 if (!is_rmmod) {
541 char *opt_filename = xasprintf("/etc/modules/%s", name);
542 options = xmalloc_open_read_close(opt_filename, NULL);
543 if (options)
544 replace(options, '\n', ' ');
545#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
546 if (cmdline_options) {
547 /* NB: cmdline_options always have one leading ' '
548 * (see main()), we remove it here */
549 char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
550 cmdline_options + 1, options);
551 free(options);
552 options = op;
553 }
554#endif
555 free(opt_filename);
556 module_load_options = options;
557 dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
558 }
559
560 if (!module_count) {
561 /* Scan module directory. This is done only once.
562 * It will attempt module load, and will exit(EXIT_SUCCESS)
563 * on success. */
564 module_found_idx = -1;
565 recursive_action(".",
566 ACTION_RECURSE, /* flags */
567 fileAction, /* file action */
568 NULL, /* dir action */
569 name, /* user data */
570 0); /* depth */
571 dbg1_error_msg("dirscan complete");
572 /* Module was not found, or load failed, or is_rmmod */
573 if (module_found_idx >= 0) { /* module was found */
574 info = &modinfo[module_found_idx];
575 } else { /* search for alias, not a plain module name */
576 info = find_alias(name);
577 }
578 } else {
579 info = find_alias(name);
580 }
581
582// Problem here: there can be more than one module
583// for the given alias. For example,
584// "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches
585// ata_piix because it has an alias "pci:v00008086d00007010sv*sd*bc*sc*i*"
586// and ata_generic, it has an alias "alias=pci:v*d*sv*sd*bc01sc01i*"
587// Standard modprobe would load them both.
588// In this code, find_alias() returns only the first matching module.
589
590 /* rmmod? unload it by name */
591 if (is_rmmod) {
592 if (delete_module(name, O_NONBLOCK | O_EXCL) != 0) {
593 if (!(option_mask32 & OPT_q))
594 bb_perror_msg("remove '%s'", name);
595 goto ret;
596 }
597 /* N.B. we do not stop here -
598 * continue to unload modules on which the module depends:
599 * "-r --remove: option causes modprobe to remove a module.
600 * If the modules it depends on are also unused, modprobe
601 * will try to remove them, too." */
602 }
603
604 if (!info) {
605 /* both dirscan and find_alias found nothing */
606 if (!is_rmmod && applet_name[0] != 'd') /* it wasn't rmmod or depmod */
607 bb_error_msg("module '%s' not found", name);
608//TODO: _and_die()? or should we continue (un)loading modules listed on cmdline?
609 goto ret;
610 }
611
612 /* Iterate thru dependencies, trying to (un)load them */
613 deps = str_2_list(info->deps);
614 for (s = deps; *s; s += strlen(s) + 1) {
615 //if (strcmp(name, s) != 0) // N.B. do loops exist?
616 dbg1_error_msg("recurse on dep '%s'", s);
617 process_module(s, NULL);
618 dbg1_error_msg("recurse on dep '%s' done", s);
619 }
620 free(deps);
621
622 /* modprobe -> load it */
623 if (!is_rmmod) {
624 if (!options || strstr(options, "blacklist") == NULL) {
625 errno = 0;
626 if (load_module(info->pathname, options) != 0) {
627 if (EEXIST != errno) {
628 bb_error_msg("'%s': %s",
629 info->pathname,
630 moderror(errno));
631 } else {
632 dbg1_error_msg("'%s': %s",
633 info->pathname,
634 moderror(errno));
635 }
636 }
637 } else {
638 dbg1_error_msg("'%s': blacklisted", info->pathname);
639 }
640 }
641 ret:
642 free(options);
643//TODO: return load attempt result from process_module.
644//If dep didn't load ok, continuing makes little sense.
645}
646#undef cmdline_options
647
648
649/* For reference, module-init-tools v3.4 options:
650
651# insmod
652Usage: insmod filename [args]
653
654# rmmod --help
655Usage: rmmod [-fhswvV] modulename ...
656 -f (or --force) forces a module unload, and may crash your
657 machine. This requires the Forced Module Removal option
658 when the kernel was compiled.
659 -h (or --help) prints this help text
660 -s (or --syslog) says use syslog, not stderr
661 -v (or --verbose) enables more messages
662 -V (or --version) prints the version code
663 -w (or --wait) begins module removal even if it is used
664 and will stop new users from accessing the module (so it
665 should eventually fall to zero).
666
667# modprobe
668Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b]
669 [-o <modname>] [ --dump-modversions ] <modname> [parameters...]
670modprobe -r [-n] [-i] [-v] <modulename> ...
671modprobe -l -t <dirname> [ -a <modulename> ...]
672
673# depmod --help
674depmod 3.4 -- part of module-init-tools
675depmod -[aA] [-n -e -v -q -V -r -u]
676 [-b basedirectory] [forced_version]
677depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ...
678If no arguments (except options) are given, "depmod -a" is assumed.
679depmod will output a dependency list suitable for the modprobe utility.
680Options:
681 -a, --all Probe all modules
682 -A, --quick Only does the work if there's a new module
683 -n, --show Write the dependency file on stdout only
684 -e, --errsyms Report not supplied symbols
685 -V, --version Print the release version
686 -v, --verbose Enable verbose mode
687 -h, --help Print this usage message
688The following options are useful for people managing distributions:
689 -b basedirectory
690 --basedir basedirectory
691 Use an image of a module tree
692 -F kernelsyms
693 --filesyms kernelsyms
694 Use the file instead of the current kernel symbols
695*/
696
697//usage:#if ENABLE_MODPROBE_SMALL
698
699//usage:#define depmod_trivial_usage NOUSAGE_STR
700//usage:#define depmod_full_usage ""
701
702//usage:#define lsmod_trivial_usage
703//usage: ""
704//usage:#define lsmod_full_usage "\n\n"
705//usage: "List the currently loaded kernel modules"
706
707//usage:#define insmod_trivial_usage
708//usage: IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ")
709//usage: IF_NOT_FEATURE_2_4_MODULES("FILE ")
710//usage: "[SYMBOL=VALUE]..."
711//usage:#define insmod_full_usage "\n\n"
712//usage: "Load the specified kernel modules into the kernel"
713//usage: IF_FEATURE_2_4_MODULES( "\n"
714//usage: "\nOptions:"
715//usage: "\n -f Force module to load into the wrong kernel version"
716//usage: "\n -k Make module autoclean-able"
717//usage: "\n -v Verbose"
718//usage: "\n -q Quiet"
719//usage: "\n -L Lock: prevent simultaneous loads"
720//usage: IF_FEATURE_INSMOD_LOAD_MAP(
721//usage: "\n -m Output load map to stdout"
722//usage: )
723//usage: "\n -x Don't export externs"
724//usage: )
725
726//usage:#define rmmod_trivial_usage
727//usage: "[-wfa] [MODULE]..."
728//usage:#define rmmod_full_usage "\n\n"
729//usage: "Unload kernel modules\n"
730//usage: "\nOptions:"
731//usage: "\n -w Wait until the module is no longer used"
732//usage: "\n -f Force unload"
733//usage: "\n -a Remove all unused modules (recursively)"
734//usage:
735//usage:#define rmmod_example_usage
736//usage: "$ rmmod tulip\n"
737
738//usage:#define modprobe_trivial_usage
739//usage: "[-qfwrsv] MODULE [symbol=value]..."
740//usage:#define modprobe_full_usage "\n\n"
741//usage: "Options:"
742//usage: "\n -r Remove MODULE (stacks) or do autoclean"
743//usage: "\n -q Quiet"
744//usage: "\n -v Verbose"
745//usage: "\n -f Force"
746//usage: "\n -w Wait for unload"
747//usage: "\n -s Report via syslog instead of stderr"
748
749//usage:#endif
750
751int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
752int modprobe_main(int argc UNUSED_PARAM, char **argv)
753{
754 struct utsname uts;
755 char applet0 = applet_name[0];
756 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
757
758 /* are we lsmod? -> just dump /proc/modules */
759 if ('l' == applet0) {
760 xprint_and_close_file(xfopen_for_read("/proc/modules"));
761 return EXIT_SUCCESS;
762 }
763
764 INIT_G();
765
766 /* Prevent ugly corner cases with no modules at all */
767 modinfo = xzalloc(sizeof(modinfo[0]));
768
769 if ('i' != applet0) { /* not insmod */
770 /* Goto modules directory */
771 xchdir(CONFIG_DEFAULT_MODULES_DIR);
772 }
773 uname(&uts); /* never fails */
774
775 /* depmod? */
776 if ('d' == applet0) {
777 /* Supported:
778 * -n: print result to stdout
779 * -a: process all modules (default)
780 * optional VERSION parameter
781 * Ignored:
782 * -A: do work only if a module is newer than depfile
783 * -e: report any symbols which a module needs
784 * which are not supplied by other modules or the kernel
785 * -F FILE: System.map (symbols for -e)
786 * -q, -r, -u: noop?
787 * Not supported:
788 * -b BASEDIR: (TODO!) modules are in
789 * $BASEDIR/lib/modules/$VERSION
790 * -v: human readable deps to stdout
791 * -V: version (don't want to support it - people may depend
792 * on it as an indicator of "standard" depmod)
793 * -h: help (well duh)
794 * module1.o module2.o parameters (just ignored for now)
795 */
796 getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL);
797 argv += optind;
798 /* if (argv[0] && argv[1]) bb_show_usage(); */
799 /* Goto $VERSION directory */
800 xchdir(argv[0] ? argv[0] : uts.release);
801 /* Force full module scan by asking to find a bogus module.
802 * This will generate modules.dep.bb as a side effect. */
803 process_module((char*)"/", NULL);
804 return !wrote_dep_bb_ok;
805 }
806
807 /* insmod, modprobe, rmmod require at least one argument */
808 opt_complementary = "-1";
809 /* only -q (quiet) and -r (rmmod),
810 * the rest are accepted and ignored (compat) */
811 getopt32(argv, "qrfsvw");
812 argv += optind;
813
814 /* are we rmmod? -> simulate modprobe -r */
815 if ('r' == applet0) {
816 option_mask32 |= OPT_r;
817 }
818
819 if ('i' != applet0) { /* not insmod */
820 /* Goto $VERSION directory */
821 xchdir(uts.release);
822 }
823
824#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
825 /* If not rmmod, parse possible module options given on command line.
826 * insmod/modprobe takes one module name, the rest are parameters. */
827 options = NULL;
828 if ('r' != applet0) {
829 char **arg = argv;
830 while (*++arg) {
831 /* Enclose options in quotes */
832 char *s = options;
833 options = xasprintf("%s \"%s\"", s ? s : "", *arg);
834 free(s);
835 *arg = NULL;
836 }
837 }
838#else
839 if ('r' != applet0)
840 argv[1] = NULL;
841#endif
842
843 if ('i' == applet0) { /* insmod */
844 size_t len;
845 void *map;
846
847 len = MAXINT(ssize_t);
848 map = xmalloc_open_zipped_read_close(*argv, &len);
849 if (!map)
850 bb_perror_msg_and_die("can't read '%s'", *argv);
851 if (init_module(map, len,
852 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "")
853 IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("")
854 ) != 0
855 ) {
856 bb_error_msg_and_die("can't insert '%s': %s",
857 *argv, moderror(errno));
858 }
859 return 0;
860 }
861
862 /* Try to load modprobe.dep.bb */
863 load_dep_bb();
864
865 /* Load/remove modules.
866 * Only rmmod loops here, modprobe has only argv[0] */
867 do {
868 process_module(*argv, options);
869 } while (*++argv);
870
871 if (ENABLE_FEATURE_CLEAN_UP) {
872 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)
873 }
874 return EXIT_SUCCESS;
875}
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