blob: 906d5251a23a52f60e4ac4683bf9bea5ec7b51b4
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 | |
22 | extern int init_module(void *module, unsigned long len, const char *options); |
23 | extern int delete_module(const char *module, unsigned flags); |
24 | extern 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 | |
37 | enum { |
38 | OPT_q = (1 << 0), /* be quiet */ |
39 | OPT_r = (1 << 1), /* module removal instead of loading */ |
40 | }; |
41 | |
42 | typedef struct module_info { |
43 | char *pathname; |
44 | char *aliases; |
45 | char *deps; |
46 | } module_info; |
47 | |
48 | /* |
49 | * GLOBALS |
50 | */ |
51 | struct 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 | |
78 | static 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 | |
90 | static 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 | |
97 | static void bksp(void) |
98 | { |
99 | if (stringbuf_idx) |
100 | stringbuf_idx--; |
101 | } |
102 | |
103 | static void reset_stringbuf(void) |
104 | { |
105 | stringbuf_idx = 0; |
106 | } |
107 | |
108 | static char* copy_stringbuf(void) |
109 | { |
110 | char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */ |
111 | return memcpy(copy, stringbuf, stringbuf_idx); |
112 | } |
113 | |
114 | static 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 | |
137 | static 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 */ |
147 | static 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... */ |
160 | static 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 | |
177 | static 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 | |
197 | static 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 | |
252 | static 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 | |
265 | static 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 | |
307 | static 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 | |
361 | static 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 | |
391 | static 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 | |
424 | static 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() |
496 | static 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 |
524 | static 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 | |
598 | if (applet_name[0] == 'r') { |
599 | /* rmmod: do not remove dependencies, exit */ |
600 | goto ret; |
601 | } |
602 | |
603 | /* modprobe -r: we do not stop here - |
604 | * continue to unload modules on which the module depends: |
605 | * "-r --remove: option causes modprobe to remove a module. |
606 | * If the modules it depends on are also unused, modprobe |
607 | * will try to remove them, too." |
608 | */ |
609 | } |
610 | |
611 | if (!info) { |
612 | /* both dirscan and find_alias found nothing */ |
613 | if (!is_rmmod && applet_name[0] != 'd') /* it wasn't rmmod or depmod */ |
614 | bb_error_msg("module '%s' not found", name); |
615 | //TODO: _and_die()? or should we continue (un)loading modules listed on cmdline? |
616 | goto ret; |
617 | } |
618 | |
619 | /* Iterate thru dependencies, trying to (un)load them */ |
620 | deps = str_2_list(info->deps); |
621 | for (s = deps; *s; s += strlen(s) + 1) { |
622 | //if (strcmp(name, s) != 0) // N.B. do loops exist? |
623 | dbg1_error_msg("recurse on dep '%s'", s); |
624 | process_module(s, NULL); |
625 | dbg1_error_msg("recurse on dep '%s' done", s); |
626 | } |
627 | free(deps); |
628 | |
629 | /* modprobe -> load it */ |
630 | if (!is_rmmod) { |
631 | if (!options || strstr(options, "blacklist") == NULL) { |
632 | errno = 0; |
633 | if (load_module(info->pathname, options) != 0) { |
634 | if (EEXIST != errno) { |
635 | bb_error_msg("'%s': %s", |
636 | info->pathname, |
637 | moderror(errno)); |
638 | } else { |
639 | dbg1_error_msg("'%s': %s", |
640 | info->pathname, |
641 | moderror(errno)); |
642 | } |
643 | } |
644 | } else { |
645 | dbg1_error_msg("'%s': blacklisted", info->pathname); |
646 | } |
647 | } |
648 | ret: |
649 | free(options); |
650 | //TODO: return load attempt result from process_module. |
651 | //If dep didn't load ok, continuing makes little sense. |
652 | } |
653 | #undef cmdline_options |
654 | |
655 | |
656 | /* For reference, module-init-tools v3.4 options: |
657 | |
658 | # insmod |
659 | Usage: insmod filename [args] |
660 | |
661 | # rmmod --help |
662 | Usage: rmmod [-fhswvV] modulename ... |
663 | -f (or --force) forces a module unload, and may crash your |
664 | machine. This requires the Forced Module Removal option |
665 | when the kernel was compiled. |
666 | -h (or --help) prints this help text |
667 | -s (or --syslog) says use syslog, not stderr |
668 | -v (or --verbose) enables more messages |
669 | -V (or --version) prints the version code |
670 | -w (or --wait) begins module removal even if it is used |
671 | and will stop new users from accessing the module (so it |
672 | should eventually fall to zero). |
673 | |
674 | # modprobe |
675 | Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b] |
676 | [-o <modname>] [ --dump-modversions ] <modname> [parameters...] |
677 | modprobe -r [-n] [-i] [-v] <modulename> ... |
678 | modprobe -l -t <dirname> [ -a <modulename> ...] |
679 | |
680 | # depmod --help |
681 | depmod 3.4 -- part of module-init-tools |
682 | depmod -[aA] [-n -e -v -q -V -r -u] |
683 | [-b basedirectory] [forced_version] |
684 | depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ... |
685 | If no arguments (except options) are given, "depmod -a" is assumed. |
686 | depmod will output a dependency list suitable for the modprobe utility. |
687 | Options: |
688 | -a, --all Probe all modules |
689 | -A, --quick Only does the work if there's a new module |
690 | -n, --show Write the dependency file on stdout only |
691 | -e, --errsyms Report not supplied symbols |
692 | -V, --version Print the release version |
693 | -v, --verbose Enable verbose mode |
694 | -h, --help Print this usage message |
695 | The following options are useful for people managing distributions: |
696 | -b basedirectory |
697 | --basedir basedirectory |
698 | Use an image of a module tree |
699 | -F kernelsyms |
700 | --filesyms kernelsyms |
701 | Use the file instead of the current kernel symbols |
702 | */ |
703 | |
704 | //usage:#if ENABLE_MODPROBE_SMALL || ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE |
705 | |
706 | //// Note: currently, help system shows modprobe --help text for all aliased cmds |
707 | //// (see APPLET_ODDNAME macro definition). |
708 | //// All other help texts defined below are not used. FIXME? |
709 | |
710 | //usage:#if ENABLE_MODPROBE_SMALL |
711 | //usage:#define depmod_trivial_usage NOUSAGE_STR |
712 | //usage:#define depmod_full_usage "" |
713 | //usage:#endif |
714 | |
715 | //usage:#define lsmod_trivial_usage |
716 | //usage: "" |
717 | //usage:#define lsmod_full_usage "\n\n" |
718 | //usage: "List the currently loaded kernel modules" |
719 | |
720 | //usage:#define insmod_trivial_usage |
721 | //usage: IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ") |
722 | //usage: IF_NOT_FEATURE_2_4_MODULES("FILE ") |
723 | //usage: "[SYMBOL=VALUE]..." |
724 | //usage:#define insmod_full_usage "\n\n" |
725 | //usage: "Load the specified kernel modules into the kernel" |
726 | //usage: IF_FEATURE_2_4_MODULES( "\n" |
727 | //usage: "\n -f Force module to load into the wrong kernel version" |
728 | //usage: "\n -k Make module autoclean-able" |
729 | //usage: "\n -v Verbose" |
730 | //usage: "\n -q Quiet" |
731 | //usage: "\n -L Lock: prevent simultaneous loads" |
732 | //usage: IF_FEATURE_INSMOD_LOAD_MAP( |
733 | //usage: "\n -m Output load map to stdout" |
734 | //usage: ) |
735 | //usage: "\n -x Don't export externs" |
736 | //usage: ) |
737 | |
738 | //usage:#define rmmod_trivial_usage |
739 | //usage: "[-wfa] [MODULE]..." |
740 | //usage:#define rmmod_full_usage "\n\n" |
741 | //usage: "Unload kernel modules\n" |
742 | //usage: "\n -w Wait until the module is no longer used" |
743 | //usage: "\n -f Force unload" |
744 | //usage: "\n -a Remove all unused modules (recursively)" |
745 | //usage: |
746 | //usage:#define rmmod_example_usage |
747 | //usage: "$ rmmod tulip\n" |
748 | |
749 | //usage:#define modprobe_trivial_usage |
750 | //usage: "[-qfwrsv] MODULE [symbol=value]..." |
751 | //usage:#define modprobe_full_usage "\n\n" |
752 | //usage: " -r Remove MODULE (stacks) or do autoclean" |
753 | //usage: "\n -q Quiet" |
754 | //usage: "\n -v Verbose" |
755 | //usage: "\n -f Force" |
756 | //usage: "\n -w Wait for unload" |
757 | //usage: "\n -s Report via syslog instead of stderr" |
758 | |
759 | //usage:#endif |
760 | |
761 | int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
762 | int modprobe_main(int argc UNUSED_PARAM, char **argv) |
763 | { |
764 | struct utsname uts; |
765 | struct stat info; |
766 | char applet0 = applet_name[0]; |
767 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;) |
768 | |
769 | /* are we lsmod? -> just dump /proc/modules */ |
770 | if ('l' == applet0) { |
771 | xprint_and_close_file(xfopen_for_read("/proc/modules")); |
772 | return EXIT_SUCCESS; |
773 | } |
774 | |
775 | INIT_G(); |
776 | |
777 | /* Prevent ugly corner cases with no modules at all */ |
778 | modinfo = xzalloc(sizeof(modinfo[0])); |
779 | |
780 | if ('i' != applet0 && 'r' != applet0) { /* not insmod and not rmmod */ |
781 | /* Goto modules directory */ |
782 | xchdir(CONFIG_DEFAULT_MODULES_DIR); |
783 | } |
784 | uname(&uts); /* never fails */ |
785 | |
786 | /* depmod? */ |
787 | if ('d' == applet0) { |
788 | /* Supported: |
789 | * -n: print result to stdout |
790 | * -a: process all modules (default) |
791 | * optional VERSION parameter |
792 | * Ignored: |
793 | * -A: do work only if a module is newer than depfile |
794 | * -e: report any symbols which a module needs |
795 | * which are not supplied by other modules or the kernel |
796 | * -F FILE: System.map (symbols for -e) |
797 | * -q, -r, -u: noop? |
798 | * Not supported: |
799 | * -b BASEDIR: (TODO!) modules are in |
800 | * $BASEDIR/lib/modules/$VERSION |
801 | * -v: human readable deps to stdout |
802 | * -V: version (don't want to support it - people may depend |
803 | * on it as an indicator of "standard" depmod) |
804 | * -h: help (well duh) |
805 | * module1.o module2.o parameters (just ignored for now) |
806 | */ |
807 | getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL); |
808 | argv += optind; |
809 | /* if (argv[0] && argv[1]) bb_show_usage(); */ |
810 | if (argv[0]) { |
811 | xchdir(argv[0]); |
812 | } else { |
813 | if (stat(uts.release, &info) == 0) { |
814 | /* Goto $VERSION directory */ |
815 | xchdir(uts.release); |
816 | } |
817 | } |
818 | /* Force full module scan by asking to find a bogus module. |
819 | * This will generate modules.dep.bb as a side effect. */ |
820 | process_module((char*)"/", NULL); |
821 | return !wrote_dep_bb_ok; |
822 | } |
823 | |
824 | /* insmod, modprobe, rmmod require at least one argument */ |
825 | opt_complementary = "-1"; |
826 | /* only -q (quiet) and -r (rmmod), |
827 | * the rest are accepted and ignored (compat) */ |
828 | getopt32(argv, "qrfsvwb"); |
829 | argv += optind; |
830 | |
831 | /* are we rmmod? -> simulate modprobe -r */ |
832 | if ('r' == applet0) { |
833 | option_mask32 |= OPT_r; |
834 | } |
835 | |
836 | if ('i' != applet0 && 'r' != applet0) { /* not insmod and not rmmod */ |
837 | if (stat(uts.release, &info) == 0) { |
838 | /* Goto $VERSION directory */ |
839 | xchdir(uts.release); |
840 | } |
841 | } |
842 | |
843 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE |
844 | /* If not rmmod, parse possible module options given on command line. |
845 | * insmod/modprobe takes one module name, the rest are parameters. */ |
846 | options = NULL; |
847 | if ('r' != applet0) { |
848 | char **arg = argv; |
849 | while (*++arg) { |
850 | /* Enclose options in quotes */ |
851 | char *s = options; |
852 | options = xasprintf("%s \"%s\"", s ? s : "", *arg); |
853 | free(s); |
854 | *arg = NULL; |
855 | } |
856 | } |
857 | #else |
858 | if ('r' != applet0) |
859 | argv[1] = NULL; |
860 | #endif |
861 | |
862 | if ('i' == applet0) { /* insmod */ |
863 | size_t len; |
864 | void *map; |
865 | |
866 | len = MAXINT(ssize_t); |
867 | map = xmalloc_open_zipped_read_close(*argv, &len); |
868 | if (!map) |
869 | bb_perror_msg_and_die("can't read '%s'", *argv); |
870 | if (init_module(map, len, |
871 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "") |
872 | IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("") |
873 | ) != 0 |
874 | ) { |
875 | bb_error_msg_and_die("can't insert '%s': %s", |
876 | *argv, moderror(errno)); |
877 | } |
878 | return 0; |
879 | } |
880 | |
881 | /* Try to load modprobe.dep.bb */ |
882 | load_dep_bb(); |
883 | |
884 | /* Load/remove modules. |
885 | * Only rmmod loops here, modprobe has only argv[0] */ |
886 | do { |
887 | process_module(*argv, options); |
888 | } while (*++argv); |
889 | |
890 | if (ENABLE_FEATURE_CLEAN_UP) { |
891 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);) |
892 | } |
893 | return EXIT_SUCCESS; |
894 | } |
895 |