source: MondoRescue/branches/3.3/mindi-busybox/modutils/modprobe-small.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
  • Property svn:eol-style set to native
File size: 27.8 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, depmod))
13//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(insmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, insmod))
14//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(lsmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, lsmod))
15//applet:IF_MODPROBE_SMALL(APPLET_ODDNAME(rmmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, rmmod))
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);
24/* linux/include/linux/module.h has limit of 64 chars on module names */
25#undef MODULE_NAME_LEN
26#define MODULE_NAME_LEN 64
27
28
29#if 1
30# define dbg1_error_msg(...) ((void)0)
31# define dbg2_error_msg(...) ((void)0)
32#else
33# define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
34# define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
35#endif
36
37#define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb"
38
39enum {
40 OPT_q = (1 << 0), /* be quiet */
41 OPT_r = (1 << 1), /* module removal instead of loading */
42};
43
44typedef struct module_info {
45 char *pathname;
46 char *aliases;
47 char *deps;
48 smallint open_read_failed;
49} module_info;
50
51/*
52 * GLOBALS
53 */
54struct globals {
55 module_info *modinfo;
56 char *module_load_options;
57 smallint dep_bb_seen;
58 smallint wrote_dep_bb_ok;
59 unsigned module_count;
60 int module_found_idx;
61 unsigned stringbuf_idx;
62 unsigned stringbuf_size;
63 char *stringbuf; /* some modules have lots of stuff */
64 /* for example, drivers/media/video/saa7134/saa7134.ko */
65 /* therefore having a fixed biggish buffer is not wise */
66};
67#define G (*ptr_to_globals)
68#define modinfo (G.modinfo )
69#define dep_bb_seen (G.dep_bb_seen )
70#define wrote_dep_bb_ok (G.wrote_dep_bb_ok )
71#define module_count (G.module_count )
72#define module_found_idx (G.module_found_idx )
73#define module_load_options (G.module_load_options)
74#define stringbuf_idx (G.stringbuf_idx )
75#define stringbuf_size (G.stringbuf_size )
76#define stringbuf (G.stringbuf )
77#define INIT_G() do { \
78 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
79} while (0)
80
81static void append(const char *s)
82{
83 unsigned len = strlen(s);
84 if (stringbuf_idx + len + 15 > stringbuf_size) {
85 stringbuf_size = stringbuf_idx + len + 127;
86 dbg2_error_msg("grow stringbuf to %u", stringbuf_size);
87 stringbuf = xrealloc(stringbuf, stringbuf_size);
88 }
89 memcpy(stringbuf + stringbuf_idx, s, len);
90 stringbuf_idx += len;
91}
92
93static void appendc(char c)
94{
95 /* We appendc() only after append(), + 15 trick in append()
96 * makes it unnecessary to check for overflow here */
97 stringbuf[stringbuf_idx++] = c;
98}
99
100static void bksp(void)
101{
102 if (stringbuf_idx)
103 stringbuf_idx--;
104}
105
106static void reset_stringbuf(void)
107{
108 stringbuf_idx = 0;
109}
110
111static char* copy_stringbuf(void)
112{
113 char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */
114 return memcpy(copy, stringbuf, stringbuf_idx);
115}
116
117static char* find_keyword(char *ptr, size_t len, const char *word)
118{
119 if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */
120 return NULL;
121
122 len -= strlen(word) - 1;
123 while ((ssize_t)len > 0) {
124 char *old = ptr;
125 char *after_word;
126
127 /* search for the first char in word */
128 ptr = memchr(ptr, word[0], len);
129 if (ptr == NULL) /* no occurance left, done */
130 break;
131 after_word = is_prefixed_with(ptr, word);
132 if (after_word)
133 return after_word; /* found, return ptr past it */
134 ++ptr;
135 len -= (ptr - old);
136 }
137 return NULL;
138}
139
140static void replace(char *s, char what, char with)
141{
142 while (*s) {
143 if (what == *s)
144 *s = with;
145 ++s;
146 }
147}
148
149static char *filename2modname(const char *filename, char *modname)
150{
151 int i;
152 const char *from;
153
154 // Disabled since otherwise "modprobe dir/name" would work
155 // as if it is "modprobe name". It is unclear why
156 // 'basenamization' was here in the first place.
157 //from = bb_get_last_path_component_nostrip(filename);
158 from = filename;
159 for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++)
160 modname[i] = (from[i] == '-') ? '_' : from[i];
161 modname[i] = '\0';
162
163 return modname;
164}
165
166static int pathname_matches_modname(const char *pathname, const char *modname)
167{
168 int r;
169 char name[MODULE_NAME_LEN];
170 filename2modname(bb_get_last_path_component_nostrip(pathname), name);
171 r = (strcmp(name, modname) == 0);
172 return r;
173}
174
175/* Take "word word", return malloced "word",NUL,"word",NUL,NUL */
176static char* str_2_list(const char *str)
177{
178 int len = strlen(str) + 1;
179 char *dst = xmalloc(len + 1);
180
181 dst[len] = '\0';
182 memcpy(dst, str, len);
183//TODO: protect against 2+ spaces: "word word"
184 replace(dst, ' ', '\0');
185 return dst;
186}
187
188/* We use error numbers in a loose translation... */
189static const char *moderror(int err)
190{
191 switch (err) {
192 case ENOEXEC:
193 return "invalid module format";
194 case ENOENT:
195 return "unknown symbol in module or invalid parameter";
196 case ESRCH:
197 return "module has wrong symbol version";
198 case EINVAL: /* "invalid parameter" */
199 return "unknown symbol in module or invalid parameter"
200 + sizeof("unknown symbol in module or");
201 default:
202 return strerror(err);
203 }
204}
205
206static int load_module(const char *fname, const char *options)
207{
208#if 1
209 int r;
210 size_t len = MAXINT(ssize_t);
211 char *module_image;
212 dbg1_error_msg("load_module('%s','%s')", fname, options);
213
214 module_image = xmalloc_open_zipped_read_close(fname, &len);
215 r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
216 free(module_image);
217 dbg1_error_msg("load_module:%d", r);
218 return r; /* 0 = success */
219#else
220 /* For testing */
221 dbg1_error_msg("load_module('%s','%s')", fname, options);
222 return 1;
223#endif
224}
225
226/* Returns !0 if open/read was unsuccessful */
227static int parse_module(module_info *info, const char *pathname)
228{
229 char *module_image;
230 char *ptr;
231 size_t len;
232 size_t pos;
233 dbg1_error_msg("parse_module('%s')", pathname);
234
235 /* Read (possibly compressed) module */
236 errno = 0;
237 len = 64 * 1024 * 1024; /* 64 Mb at most */
238 module_image = xmalloc_open_zipped_read_close(pathname, &len);
239 /* module_image == NULL is ok here, find_keyword handles it */
240//TODO: optimize redundant module body reads
241
242 /* "alias1 symbol:sym1 alias2 symbol:sym2" */
243 reset_stringbuf();
244 pos = 0;
245 while (1) {
246 unsigned start = stringbuf_idx;
247 ptr = find_keyword(module_image + pos, len - pos, "alias=");
248 if (!ptr) {
249 ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
250 if (!ptr)
251 break;
252 /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
253 * in many modules. What do they mean? */
254 if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0)
255 goto skip;
256 dbg2_error_msg("alias:'symbol:%s'", ptr);
257 append("symbol:");
258 } else {
259 dbg2_error_msg("alias:'%s'", ptr);
260 }
261 append(ptr);
262 appendc(' ');
263 /*
264 * Don't add redundant aliases, such as:
265 * libcrc32c.ko symbol:crc32c symbol:crc32c
266 */
267 if (start) { /* "if we aren't the first alias" */
268 char *found, *last;
269 stringbuf[stringbuf_idx] = '\0';
270 last = stringbuf + start;
271 /*
272 * String at last-1 is " symbol:crc32c "
273 * (with both leading and trailing spaces).
274 */
275 if (strncmp(stringbuf, last, stringbuf_idx - start) == 0)
276 /* First alias matches us */
277 found = stringbuf;
278 else
279 /* Does any other alias match? */
280 found = strstr(stringbuf, last-1);
281 if (found < last-1) {
282 /* There is absolutely the same string before us */
283 dbg2_error_msg("redundant:'%s'", last);
284 stringbuf_idx = start;
285 goto skip;
286 }
287 }
288 skip:
289 pos = (ptr - module_image);
290 }
291 bksp(); /* remove last ' ' */
292 info->aliases = copy_stringbuf();
293 replace(info->aliases, '-', '_');
294
295 /* "dependency1 depandency2" */
296 reset_stringbuf();
297 ptr = find_keyword(module_image, len, "depends=");
298 if (ptr && *ptr) {
299 replace(ptr, ',', ' ');
300 replace(ptr, '-', '_');
301 dbg2_error_msg("dep:'%s'", ptr);
302 append(ptr);
303 }
304 free(module_image);
305 info->deps = copy_stringbuf();
306
307 info->open_read_failed = (module_image == NULL);
308 return info->open_read_failed;
309}
310
311static FAST_FUNC int fileAction(const char *pathname,
312 struct stat *sb UNUSED_PARAM,
313 void *modname_to_match,
314 int depth UNUSED_PARAM)
315{
316 int cur;
317 const char *fname;
318
319 pathname += 2; /* skip "./" */
320 fname = bb_get_last_path_component_nostrip(pathname);
321 if (!strrstr(fname, ".ko")) {
322 dbg1_error_msg("'%s' is not a module", pathname);
323 return TRUE; /* not a module, continue search */
324 }
325
326 cur = module_count++;
327 modinfo = xrealloc_vector(modinfo, 12, cur);
328 modinfo[cur].pathname = xstrdup(pathname);
329 /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */
330 /*modinfo[cur+1].pathname = NULL;*/
331
332 if (!pathname_matches_modname(fname, modname_to_match)) {
333 dbg1_error_msg("'%s' module name doesn't match", pathname);
334 return TRUE; /* module name doesn't match, continue search */
335 }
336
337 dbg1_error_msg("'%s' module name matches", pathname);
338 module_found_idx = cur;
339 if (parse_module(&modinfo[cur], pathname) != 0)
340 return TRUE; /* failed to open/read it, no point in trying loading */
341
342 if (!(option_mask32 & OPT_r)) {
343 if (load_module(pathname, module_load_options) == 0) {
344 /* Load was successful, there is nothing else to do.
345 * This can happen ONLY for "top-level" module load,
346 * not a dep, because deps dont do dirscan. */
347 exit(EXIT_SUCCESS);
348 }
349 }
350
351 return TRUE;
352}
353
354static int load_dep_bb(void)
355{
356 char *line;
357 FILE *fp = fopen_for_read(DEPFILE_BB);
358
359 if (!fp)
360 return 0;
361
362 dep_bb_seen = 1;
363 dbg1_error_msg("loading "DEPFILE_BB);
364
365 /* Why? There is a rare scenario: we did not find modprobe.dep.bb,
366 * we scanned the dir and found no module by name, then we search
367 * for alias (full scan), and we decided to generate modprobe.dep.bb.
368 * But we see modprobe.dep.bb.new! Other modprobe is at work!
369 * We wait and other modprobe renames it to modprobe.dep.bb.
370 * Now we can use it.
371 * But we already have modinfo[] filled, and "module_count = 0"
372 * makes us start anew. Yes, we leak modinfo[].xxx pointers -
373 * there is not much of data there anyway. */
374 module_count = 0;
375 memset(&modinfo[0], 0, sizeof(modinfo[0]));
376
377 while ((line = xmalloc_fgetline(fp)) != NULL) {
378 char* space;
379 char* linebuf;
380 int cur;
381
382 if (!line[0]) {
383 free(line);
384 continue;
385 }
386 space = strchrnul(line, ' ');
387 cur = module_count++;
388 modinfo = xrealloc_vector(modinfo, 12, cur);
389 /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */
390 modinfo[cur].pathname = line; /* we take ownership of malloced block here */
391 if (*space)
392 *space++ = '\0';
393 modinfo[cur].aliases = space;
394 linebuf = xmalloc_fgetline(fp);
395 modinfo[cur].deps = linebuf ? linebuf : xzalloc(1);
396 if (modinfo[cur].deps[0]) {
397 /* deps are not "", so next line must be empty */
398 line = xmalloc_fgetline(fp);
399 /* Refuse to work with damaged config file */
400 if (line && line[0])
401 bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line);
402 free(line);
403 }
404 }
405 return 1;
406}
407
408static int start_dep_bb_writeout(void)
409{
410 int fd;
411
412 /* depmod -n: write result to stdout */
413 if (applet_name[0] == 'd' && (option_mask32 & 1))
414 return STDOUT_FILENO;
415
416 fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644);
417 if (fd < 0) {
418 if (errno == EEXIST) {
419 int count = 5 * 20;
420 dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB);
421 while (1) {
422 usleep(1000*1000 / 20);
423 if (load_dep_bb()) {
424 dbg1_error_msg(DEPFILE_BB" appeared");
425 return -2; /* magic number */
426 }
427 if (!--count)
428 break;
429 }
430 bb_error_msg("deleting stale %s", DEPFILE_BB".new");
431 fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC);
432 }
433 }
434 dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd);
435 return fd;
436}
437
438static void write_out_dep_bb(int fd)
439{
440 int i;
441 FILE *fp;
442
443 /* We want good error reporting. fdprintf is not good enough. */
444 fp = xfdopen_for_write(fd);
445 i = 0;
446 while (modinfo[i].pathname) {
447 fprintf(fp, "%s%s%s\n" "%s%s\n",
448 modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases,
449 modinfo[i].deps, modinfo[i].deps[0] ? "\n" : "");
450 i++;
451 }
452 /* Badly formatted depfile is a no-no. Be paranoid. */
453 errno = 0;
454 if (ferror(fp) | fclose(fp)) /* | instead of || is intended */
455 goto err;
456
457 if (fd == STDOUT_FILENO) /* it was depmod -n */
458 goto ok;
459
460 if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) {
461 err:
462 bb_perror_msg("can't create '%s'", DEPFILE_BB);
463 unlink(DEPFILE_BB".new");
464 } else {
465 ok:
466 wrote_dep_bb_ok = 1;
467 dbg1_error_msg("created "DEPFILE_BB);
468 }
469}
470
471static module_info** find_alias(const char *alias)
472{
473 int i;
474 int dep_bb_fd;
475 int infoidx;
476 module_info **infovec;
477 dbg1_error_msg("find_alias('%s')", alias);
478
479 try_again:
480 /* First try to find by name (cheaper) */
481 i = 0;
482 while (modinfo[i].pathname) {
483 if (pathname_matches_modname(modinfo[i].pathname, alias)) {
484 dbg1_error_msg("found '%s' in module '%s'",
485 alias, modinfo[i].pathname);
486 if (!modinfo[i].aliases) {
487 parse_module(&modinfo[i], modinfo[i].pathname);
488 }
489 infovec = xzalloc(2 * sizeof(infovec[0]));
490 infovec[0] = &modinfo[i];
491 return infovec;
492 }
493 i++;
494 }
495
496 /* Ok, we definitely have to scan module bodies. This is a good
497 * moment to generate modprobe.dep.bb, if it does not exist yet */
498 dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout();
499 if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */
500 goto try_again;
501
502 /* Scan all module bodies, extract modinfo (it contains aliases) */
503 i = 0;
504 infoidx = 0;
505 infovec = NULL;
506 while (modinfo[i].pathname) {
507 char *desc, *s;
508 if (!modinfo[i].aliases) {
509 parse_module(&modinfo[i], modinfo[i].pathname);
510 }
511 /* "alias1 symbol:sym1 alias2 symbol:sym2" */
512 desc = str_2_list(modinfo[i].aliases);
513 /* Does matching substring exist? */
514 for (s = desc; *s; s += strlen(s) + 1) {
515 /* Aliases in module bodies can be defined with
516 * shell patterns. Example:
517 * "pci:v000010DEd000000D9sv*sd*bc*sc*i*".
518 * Plain strcmp() won't catch that */
519 if (fnmatch(s, alias, 0) == 0) {
520 dbg1_error_msg("found alias '%s' in module '%s'",
521 alias, modinfo[i].pathname);
522 infovec = xrealloc_vector(infovec, 1, infoidx);
523 infovec[infoidx++] = &modinfo[i];
524 break;
525 }
526 }
527 free(desc);
528 i++;
529 }
530
531 /* Create module.dep.bb if needed */
532 if (dep_bb_fd >= 0) {
533 write_out_dep_bb(dep_bb_fd);
534 }
535
536 dbg1_error_msg("find_alias '%s' returns %d results", alias, infoidx);
537 return infovec;
538}
539
540#if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
541// TODO: open only once, invent config_rewind()
542static int already_loaded(const char *name)
543{
544 int ret;
545 char *line;
546 FILE *fp;
547
548 ret = 5 * 2;
549 again:
550 fp = fopen_for_read("/proc/modules");
551 if (!fp)
552 return 0;
553 while ((line = xmalloc_fgetline(fp)) != NULL) {
554 char *live;
555 char *after_name;
556
557 // Examples from kernel 3.14.6:
558 //pcspkr 12718 0 - Live 0xffffffffa017e000
559 //snd_timer 28690 2 snd_seq,snd_pcm, Live 0xffffffffa025e000
560 //i915 801405 2 - Live 0xffffffffa0096000
561 after_name = is_prefixed_with(line, name);
562 if (!after_name || *after_name != ' ') {
563 free(line);
564 continue;
565 }
566 live = strstr(line, " Live");
567 free(line);
568 if (!live) {
569 /* State can be Unloading, Loading, or Live.
570 * modprobe must not return prematurely if we see "Loading":
571 * it can cause further programs to assume load completed,
572 * but it did not (yet)!
573 * Wait up to 5*20 ms for it to resolve.
574 */
575 ret -= 2;
576 if (ret == 0)
577 break; /* huh? report as "not loaded" */
578 fclose(fp);
579 usleep(20*1000);
580 goto again;
581 }
582 ret = 1;
583 break;
584 }
585 fclose(fp);
586
587 return ret & 1;
588}
589#else
590#define already_loaded(name) 0
591#endif
592
593static int rmmod(const char *filename)
594{
595 int r;
596 char modname[MODULE_NAME_LEN];
597
598 filename2modname(filename, modname);
599 r = delete_module(modname, O_NONBLOCK | O_EXCL);
600 dbg1_error_msg("delete_module('%s', O_NONBLOCK | O_EXCL):%d", modname, r);
601 if (r != 0 && !(option_mask32 & OPT_q)) {
602 bb_perror_msg("remove '%s'", modname);
603 }
604 return r;
605}
606
607/*
608 * Given modules definition and module name (or alias, or symbol)
609 * load/remove the module respecting dependencies.
610 * NB: also called by depmod with bogus name "/",
611 * just in order to force modprobe.dep.bb creation.
612*/
613#if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
614#define process_module(a,b) process_module(a)
615#define cmdline_options ""
616#endif
617static int process_module(char *name, const char *cmdline_options)
618{
619 char *s, *deps, *options;
620 module_info **infovec;
621 module_info *info;
622 int infoidx;
623 int is_remove = (option_mask32 & OPT_r) != 0;
624 int exitcode = EXIT_SUCCESS;
625
626 dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
627
628 replace(name, '-', '_');
629
630 dbg1_error_msg("already_loaded:%d is_remove:%d", already_loaded(name), is_remove);
631
632 if (applet_name[0] == 'r') {
633 /* rmmod.
634 * Does not remove dependencies, no need to scan, just remove.
635 * (compat note: this allows and strips .ko suffix)
636 */
637 rmmod(name);
638 return EXIT_SUCCESS;
639 }
640
641 /*
642 * We used to have "is_remove != already_loaded(name)" check here, but
643 * modprobe -r pci:v00008086d00007010sv00000000sd00000000bc01sc01i80
644 * won't unload modules (there are more than one)
645 * which have this alias.
646 */
647 if (!is_remove && already_loaded(name)) {
648 dbg1_error_msg("nothing to do for '%s'", name);
649 return EXIT_SUCCESS;
650 }
651
652 options = NULL;
653 if (!is_remove) {
654 char *opt_filename = xasprintf("/etc/modules/%s", name);
655 options = xmalloc_open_read_close(opt_filename, NULL);
656 if (options)
657 replace(options, '\n', ' ');
658#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
659 if (cmdline_options) {
660 /* NB: cmdline_options always have one leading ' '
661 * (see main()), we remove it here */
662 char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
663 cmdline_options + 1, options);
664 free(options);
665 options = op;
666 }
667#endif
668 free(opt_filename);
669 module_load_options = options;
670 dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
671 }
672
673 if (!module_count) {
674 /* Scan module directory. This is done only once.
675 * It will attempt module load, and will exit(EXIT_SUCCESS)
676 * on success.
677 */
678 module_found_idx = -1;
679 recursive_action(".",
680 ACTION_RECURSE, /* flags */
681 fileAction, /* file action */
682 NULL, /* dir action */
683 name, /* user data */
684 0 /* depth */
685 );
686 dbg1_error_msg("dirscan complete");
687 /* Module was not found, or load failed, or is_remove */
688 if (module_found_idx >= 0) { /* module was found */
689 infovec = xzalloc(2 * sizeof(infovec[0]));
690 infovec[0] = &modinfo[module_found_idx];
691 } else { /* search for alias, not a plain module name */
692 infovec = find_alias(name);
693 }
694 } else {
695 infovec = find_alias(name);
696 }
697
698 if (!infovec) {
699 /* both dirscan and find_alias found nothing */
700 if (!is_remove && applet_name[0] != 'd') /* it wasn't rmmod or depmod */
701 bb_error_msg("module '%s' not found", name);
702//TODO: _and_die()? or should we continue (un)loading modules listed on cmdline?
703 goto ret;
704 }
705
706 /* There can be more than one module for the given alias. For example,
707 * "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches
708 * ata_piix because it has alias "pci:v00008086d00007010sv*sd*bc*sc*i*"
709 * and ata_generic, it has alias "pci:v*d*sv*sd*bc01sc01i*"
710 * Standard modprobe loads them both. We achieve it by returning
711 * a *list* of modinfo pointers from find_alias().
712 */
713
714 /* modprobe -r? unload module(s) */
715 if (is_remove) {
716 infoidx = 0;
717 while ((info = infovec[infoidx++]) != NULL) {
718 int r = rmmod(bb_get_last_path_component_nostrip(info->pathname));
719 if (r != 0) {
720 goto ret; /* error */
721 }
722 }
723 /* modprobe -r: we do not stop here -
724 * continue to unload modules on which the module depends:
725 * "-r --remove: option causes modprobe to remove a module.
726 * If the modules it depends on are also unused, modprobe
727 * will try to remove them, too."
728 */
729 }
730
731 infoidx = 0;
732 while ((info = infovec[infoidx++]) != NULL) {
733 /* Iterate thru dependencies, trying to (un)load them */
734 deps = str_2_list(info->deps);
735 for (s = deps; *s; s += strlen(s) + 1) {
736 //if (strcmp(name, s) != 0) // N.B. do loops exist?
737 dbg1_error_msg("recurse on dep '%s'", s);
738 process_module(s, NULL);
739 dbg1_error_msg("recurse on dep '%s' done", s);
740 }
741 free(deps);
742
743 if (is_remove)
744 continue;
745
746 /* We are modprobe: load it */
747 if (options && strstr(options, "blacklist")) {
748 dbg1_error_msg("'%s': blacklisted", info->pathname);
749 continue;
750 }
751 if (info->open_read_failed) {
752 /* We already tried it, didn't work. Don't try load again */
753 exitcode = EXIT_FAILURE;
754 continue;
755 }
756 errno = 0;
757 if (load_module(info->pathname, options) != 0) {
758 if (EEXIST != errno) {
759 bb_error_msg("'%s': %s",
760 info->pathname,
761 moderror(errno));
762 } else {
763 dbg1_error_msg("'%s': %s",
764 info->pathname,
765 moderror(errno));
766 }
767 exitcode = EXIT_FAILURE;
768 }
769 }
770 ret:
771 free(infovec);
772 free(options);
773
774 return exitcode;
775}
776#undef cmdline_options
777
778
779/* For reference, module-init-tools v3.4 options:
780
781# insmod
782Usage: insmod filename [args]
783
784# rmmod --help
785Usage: rmmod [-fhswvV] modulename ...
786 -f (or --force) forces a module unload, and may crash your
787 machine. This requires the Forced Module Removal option
788 when the kernel was compiled.
789 -h (or --help) prints this help text
790 -s (or --syslog) says use syslog, not stderr
791 -v (or --verbose) enables more messages
792 -V (or --version) prints the version code
793 -w (or --wait) begins module removal even if it is used
794 and will stop new users from accessing the module (so it
795 should eventually fall to zero).
796
797# modprobe
798Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b]
799 [-o <modname>] [ --dump-modversions ] <modname> [parameters...]
800modprobe -r [-n] [-i] [-v] <modulename> ...
801modprobe -l -t <dirname> [ -a <modulename> ...]
802
803# depmod --help
804depmod 3.4 -- part of module-init-tools
805depmod -[aA] [-n -e -v -q -V -r -u]
806 [-b basedirectory] [forced_version]
807depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ...
808If no arguments (except options) are given, "depmod -a" is assumed.
809depmod will output a dependency list suitable for the modprobe utility.
810Options:
811 -a, --all Probe all modules
812 -A, --quick Only does the work if there's a new module
813 -n, --show Write the dependency file on stdout only
814 -e, --errsyms Report not supplied symbols
815 -V, --version Print the release version
816 -v, --verbose Enable verbose mode
817 -h, --help Print this usage message
818The following options are useful for people managing distributions:
819 -b basedirectory
820 --basedir basedirectory
821 Use an image of a module tree
822 -F kernelsyms
823 --filesyms kernelsyms
824 Use the file instead of the current kernel symbols
825*/
826
827//usage:#if ENABLE_MODPROBE_SMALL
828
829//usage:#define depmod_trivial_usage NOUSAGE_STR
830//usage:#define depmod_full_usage ""
831
832//usage:#define lsmod_trivial_usage
833//usage: ""
834//usage:#define lsmod_full_usage "\n\n"
835//usage: "List the currently loaded kernel modules"
836
837//usage:#define insmod_trivial_usage
838//usage: IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ")
839//usage: IF_NOT_FEATURE_2_4_MODULES("FILE ")
840//usage: "[SYMBOL=VALUE]..."
841//usage:#define insmod_full_usage "\n\n"
842//usage: "Load kernel module"
843//usage: IF_FEATURE_2_4_MODULES( "\n"
844//usage: "\n -f Force module to load into the wrong kernel version"
845//usage: "\n -k Make module autoclean-able"
846//usage: "\n -v Verbose"
847//usage: "\n -q Quiet"
848//usage: "\n -L Lock: prevent simultaneous loads"
849//usage: IF_FEATURE_INSMOD_LOAD_MAP(
850//usage: "\n -m Output load map to stdout"
851//usage: )
852//usage: "\n -x Don't export externs"
853//usage: )
854
855//usage:#define rmmod_trivial_usage
856//usage: "[-wfa] [MODULE]..."
857//usage:#define rmmod_full_usage "\n\n"
858//usage: "Unload kernel modules\n"
859//usage: "\n -w Wait until the module is no longer used"
860//usage: "\n -f Force unload"
861//usage: "\n -a Remove all unused modules (recursively)"
862//usage:
863//usage:#define rmmod_example_usage
864//usage: "$ rmmod tulip\n"
865
866//usage:#define modprobe_trivial_usage
867//usage: "[-qfwrsv] MODULE [SYMBOL=VALUE]..."
868//usage:#define modprobe_full_usage "\n\n"
869//usage: " -r Remove MODULE (stacks) or do autoclean"
870//usage: "\n -q Quiet"
871//usage: "\n -v Verbose"
872//usage: "\n -f Force"
873//usage: "\n -w Wait for unload"
874//usage: "\n -s Report via syslog instead of stderr"
875
876//usage:#endif
877
878int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
879int modprobe_main(int argc UNUSED_PARAM, char **argv)
880{
881 int exitcode;
882 struct utsname uts;
883 char applet0 = applet_name[0];
884 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
885
886 /* are we lsmod? -> just dump /proc/modules */
887 if ('l' == applet0) {
888 xprint_and_close_file(xfopen_for_read("/proc/modules"));
889 return EXIT_SUCCESS;
890 }
891
892 INIT_G();
893
894 /* Prevent ugly corner cases with no modules at all */
895 modinfo = xzalloc(sizeof(modinfo[0]));
896
897 if ('i' != applet0) { /* not insmod */
898 /* Goto modules directory */
899 xchdir(CONFIG_DEFAULT_MODULES_DIR);
900 }
901 uname(&uts); /* never fails */
902
903 /* depmod? */
904 if ('d' == applet0) {
905 /* Supported:
906 * -n: print result to stdout
907 * -a: process all modules (default)
908 * optional VERSION parameter
909 * Ignored:
910 * -A: do work only if a module is newer than depfile
911 * -e: report any symbols which a module needs
912 * which are not supplied by other modules or the kernel
913 * -F FILE: System.map (symbols for -e)
914 * -q, -r, -u: noop?
915 * Not supported:
916 * -b BASEDIR: (TODO!) modules are in
917 * $BASEDIR/lib/modules/$VERSION
918 * -v: human readable deps to stdout
919 * -V: version (don't want to support it - people may depend
920 * on it as an indicator of "standard" depmod)
921 * -h: help (well duh)
922 * module1.o module2.o parameters (just ignored for now)
923 */
924 getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL);
925 argv += optind;
926 /* if (argv[0] && argv[1]) bb_show_usage(); */
927 /* Goto $VERSION directory */
928 xchdir(argv[0] ? argv[0] : uts.release);
929 /* Force full module scan by asking to find a bogus module.
930 * This will generate modules.dep.bb as a side effect. */
931 process_module((char*)"/", NULL);
932 return !wrote_dep_bb_ok;
933 }
934
935 /* insmod, modprobe, rmmod require at least one argument */
936 opt_complementary = "-1";
937 /* only -q (quiet) and -r (rmmod),
938 * the rest are accepted and ignored (compat) */
939 getopt32(argv, "qrfsvwb");
940 argv += optind;
941
942 /* are we rmmod? -> simulate modprobe -r */
943 if ('r' == applet0) {
944 option_mask32 |= OPT_r;
945 }
946
947 if ('i' != applet0) { /* not insmod */
948 /* Goto $VERSION directory */
949 xchdir(uts.release);
950 }
951
952#if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
953 /* If not rmmod/-r, parse possible module options given on command line.
954 * insmod/modprobe takes one module name, the rest are parameters. */
955 options = NULL;
956 if (!(option_mask32 & OPT_r)) {
957 char **arg = argv;
958 while (*++arg) {
959 /* Enclose options in quotes */
960 char *s = options;
961 options = xasprintf("%s \"%s\"", s ? s : "", *arg);
962 free(s);
963 *arg = NULL;
964 }
965 }
966#else
967 if (!(option_mask32 & OPT_r))
968 argv[1] = NULL;
969#endif
970
971 if ('i' == applet0) { /* insmod */
972 size_t len;
973 void *map;
974
975 len = MAXINT(ssize_t);
976 map = xmalloc_open_zipped_read_close(*argv, &len);
977 if (!map)
978 bb_perror_msg_and_die("can't read '%s'", *argv);
979 if (init_module(map, len,
980 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "")
981 IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("")
982 ) != 0
983 ) {
984 bb_error_msg_and_die("can't insert '%s': %s",
985 *argv, moderror(errno));
986 }
987 return EXIT_SUCCESS;
988 }
989
990 /* Try to load modprobe.dep.bb */
991 if ('r' != applet0) { /* not rmmod */
992 load_dep_bb();
993 }
994
995 /* Load/remove modules.
996 * Only rmmod/modprobe -r loops here, insmod/modprobe has only argv[0] */
997 exitcode = EXIT_SUCCESS;
998 do {
999 exitcode |= process_module(*argv, options);
1000 } while (*++argv);
1001
1002 if (ENABLE_FEATURE_CLEAN_UP) {
1003 IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)
1004 }
1005 return exitcode;
1006}
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