blob: 0fc9ea454a555eaaa3813dcd239ae5bb60fa6c9b
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 | /* config MODPROBE_SMALL is defined in Config.src to ensure better "make config" order */ |
12 | |
13 | //config:config FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE |
14 | //config: bool "Accept module options on modprobe command line" |
15 | //config: default y |
16 | //config: depends on MODPROBE_SMALL |
17 | //config: select PLATFORM_LINUX |
18 | //config: help |
19 | //config: Allow insmod and modprobe take module options from command line. |
20 | //config: |
21 | //config:config FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED |
22 | //config: bool "Skip loading of already loaded modules" |
23 | //config: default y |
24 | //config: depends on MODPROBE_SMALL |
25 | //config: help |
26 | //config: Check if the module is already loaded. |
27 | |
28 | //applet:IF_MODPROBE(IF_MODPROBE_SMALL(APPLET(modprobe, BB_DIR_SBIN, BB_SUID_DROP))) |
29 | //applet:IF_DEPMOD(IF_MODPROBE_SMALL(APPLET_ODDNAME(depmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, depmod))) |
30 | //applet:IF_INSMOD(IF_MODPROBE_SMALL(APPLET_ODDNAME(insmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, insmod))) |
31 | //applet:IF_LSMOD(IF_MODPROBE_SMALL(APPLET_ODDNAME(lsmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, lsmod))) |
32 | //applet:IF_RMMOD(IF_MODPROBE_SMALL(APPLET_ODDNAME(rmmod, modprobe, BB_DIR_SBIN, BB_SUID_DROP, rmmod))) |
33 | |
34 | //kbuild:lib-$(CONFIG_MODPROBE_SMALL) += modprobe-small.o |
35 | |
36 | #include "libbb.h" |
37 | /* After libbb.h, since it needs sys/types.h on some systems */ |
38 | #include <sys/utsname.h> /* uname() */ |
39 | #include <fnmatch.h> |
40 | #include <sys/syscall.h> |
41 | |
42 | #define init_module(mod, len, opts) syscall(__NR_init_module, mod, len, opts) |
43 | #define delete_module(mod, flags) syscall(__NR_delete_module, mod, flags) |
44 | #ifdef __NR_finit_module |
45 | # define finit_module(fd, uargs, flags) syscall(__NR_finit_module, fd, uargs, flags) |
46 | #endif |
47 | /* linux/include/linux/module.h has limit of 64 chars on module names */ |
48 | #undef MODULE_NAME_LEN |
49 | #define MODULE_NAME_LEN 64 |
50 | |
51 | |
52 | #if 1 |
53 | # define dbg1_error_msg(...) ((void)0) |
54 | # define dbg2_error_msg(...) ((void)0) |
55 | #else |
56 | # define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__) |
57 | # define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__) |
58 | #endif |
59 | |
60 | #define DEPFILE_BB CONFIG_DEFAULT_DEPMOD_FILE".bb" |
61 | |
62 | enum { |
63 | OPT_q = (1 << 0), /* be quiet */ |
64 | OPT_r = (1 << 1), /* module removal instead of loading */ |
65 | }; |
66 | |
67 | typedef struct module_info { |
68 | char *pathname; |
69 | char *aliases; |
70 | char *deps; |
71 | smallint open_read_failed; |
72 | } module_info; |
73 | |
74 | /* |
75 | * GLOBALS |
76 | */ |
77 | struct globals { |
78 | module_info *modinfo; |
79 | char *module_load_options; |
80 | smallint dep_bb_seen; |
81 | smallint wrote_dep_bb_ok; |
82 | unsigned module_count; |
83 | int module_found_idx; |
84 | unsigned stringbuf_idx; |
85 | unsigned stringbuf_size; |
86 | char *stringbuf; /* some modules have lots of stuff */ |
87 | /* for example, drivers/media/video/saa7134/saa7134.ko */ |
88 | /* therefore having a fixed biggish buffer is not wise */ |
89 | }; |
90 | #define G (*ptr_to_globals) |
91 | #define modinfo (G.modinfo ) |
92 | #define dep_bb_seen (G.dep_bb_seen ) |
93 | #define wrote_dep_bb_ok (G.wrote_dep_bb_ok ) |
94 | #define module_count (G.module_count ) |
95 | #define module_found_idx (G.module_found_idx ) |
96 | #define module_load_options (G.module_load_options) |
97 | #define stringbuf_idx (G.stringbuf_idx ) |
98 | #define stringbuf_size (G.stringbuf_size ) |
99 | #define stringbuf (G.stringbuf ) |
100 | #define INIT_G() do { \ |
101 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ |
102 | } while (0) |
103 | |
104 | static void append(const char *s) |
105 | { |
106 | unsigned len = strlen(s); |
107 | if (stringbuf_idx + len + 15 > stringbuf_size) { |
108 | stringbuf_size = stringbuf_idx + len + 127; |
109 | dbg2_error_msg("grow stringbuf to %u", stringbuf_size); |
110 | stringbuf = xrealloc(stringbuf, stringbuf_size); |
111 | } |
112 | memcpy(stringbuf + stringbuf_idx, s, len); |
113 | stringbuf_idx += len; |
114 | } |
115 | |
116 | static void appendc(char c) |
117 | { |
118 | /* We appendc() only after append(), + 15 trick in append() |
119 | * makes it unnecessary to check for overflow here */ |
120 | stringbuf[stringbuf_idx++] = c; |
121 | } |
122 | |
123 | static void bksp(void) |
124 | { |
125 | if (stringbuf_idx) |
126 | stringbuf_idx--; |
127 | } |
128 | |
129 | static void reset_stringbuf(void) |
130 | { |
131 | stringbuf_idx = 0; |
132 | } |
133 | |
134 | static char* copy_stringbuf(void) |
135 | { |
136 | char *copy = xzalloc(stringbuf_idx + 1); /* terminating NUL */ |
137 | return memcpy(copy, stringbuf, stringbuf_idx); |
138 | } |
139 | |
140 | static char* find_keyword(char *ptr, size_t len, const char *word) |
141 | { |
142 | if (!ptr) /* happens if xmalloc_open_zipped_read_close cannot read it */ |
143 | return NULL; |
144 | |
145 | len -= strlen(word) - 1; |
146 | while ((ssize_t)len > 0) { |
147 | char *old = ptr; |
148 | char *after_word; |
149 | |
150 | /* search for the first char in word */ |
151 | ptr = memchr(ptr, word[0], len); |
152 | if (ptr == NULL) /* no occurance left, done */ |
153 | break; |
154 | after_word = is_prefixed_with(ptr, word); |
155 | if (after_word) |
156 | return after_word; /* found, return ptr past it */ |
157 | ++ptr; |
158 | len -= (ptr - old); |
159 | } |
160 | return NULL; |
161 | } |
162 | |
163 | static void replace(char *s, char what, char with) |
164 | { |
165 | while (*s) { |
166 | if (what == *s) |
167 | *s = with; |
168 | ++s; |
169 | } |
170 | } |
171 | |
172 | static char *filename2modname(const char *filename, char *modname) |
173 | { |
174 | int i; |
175 | const char *from; |
176 | |
177 | // Disabled since otherwise "modprobe dir/name" would work |
178 | // as if it is "modprobe name". It is unclear why |
179 | // 'basenamization' was here in the first place. |
180 | //from = bb_get_last_path_component_nostrip(filename); |
181 | from = filename; |
182 | for (i = 0; i < (MODULE_NAME_LEN-1) && from[i] != '\0' && from[i] != '.'; i++) |
183 | modname[i] = (from[i] == '-') ? '_' : from[i]; |
184 | modname[i] = '\0'; |
185 | |
186 | return modname; |
187 | } |
188 | |
189 | static int pathname_matches_modname(const char *pathname, const char *modname) |
190 | { |
191 | int r; |
192 | char name[MODULE_NAME_LEN]; |
193 | filename2modname(bb_get_last_path_component_nostrip(pathname), name); |
194 | r = (strcmp(name, modname) == 0); |
195 | return r; |
196 | } |
197 | |
198 | /* Take "word word", return malloced "word",NUL,"word",NUL,NUL */ |
199 | static char* str_2_list(const char *str) |
200 | { |
201 | int len = strlen(str) + 1; |
202 | char *dst = xmalloc(len + 1); |
203 | |
204 | dst[len] = '\0'; |
205 | memcpy(dst, str, len); |
206 | //TODO: protect against 2+ spaces: "word word" |
207 | replace(dst, ' ', '\0'); |
208 | return dst; |
209 | } |
210 | |
211 | /* We use error numbers in a loose translation... */ |
212 | static const char *moderror(int err) |
213 | { |
214 | switch (err) { |
215 | case ENOEXEC: |
216 | return "invalid module format"; |
217 | case ENOENT: |
218 | return "unknown symbol in module or invalid parameter"; |
219 | case ESRCH: |
220 | return "module has wrong symbol version"; |
221 | case EINVAL: /* "invalid parameter" */ |
222 | return "unknown symbol in module or invalid parameter" |
223 | + sizeof("unknown symbol in module or"); |
224 | default: |
225 | return strerror(err); |
226 | } |
227 | } |
228 | |
229 | static int load_module(const char *fname, const char *options) |
230 | { |
231 | #if 1 |
232 | int r; |
233 | size_t len = MAXINT(ssize_t); |
234 | char *module_image; |
235 | |
236 | if (!options) |
237 | options = ""; |
238 | |
239 | dbg1_error_msg("load_module('%s','%s')", fname, options); |
240 | |
241 | /* |
242 | * First we try finit_module if available. Some kernels are configured |
243 | * to only allow loading of modules off of secure storage (like a read- |
244 | * only rootfs) which needs the finit_module call. If it fails, we fall |
245 | * back to normal module loading to support compressed modules. |
246 | */ |
247 | r = 1; |
248 | # ifdef __NR_finit_module |
249 | { |
250 | int fd = open(fname, O_RDONLY | O_CLOEXEC); |
251 | if (fd >= 0) { |
252 | r = finit_module(fd, options, 0) != 0; |
253 | close(fd); |
254 | } |
255 | } |
256 | # endif |
257 | if (r != 0) { |
258 | module_image = xmalloc_open_zipped_read_close(fname, &len); |
259 | r = (!module_image || init_module(module_image, len, options) != 0); |
260 | free(module_image); |
261 | } |
262 | |
263 | dbg1_error_msg("load_module:%d", r); |
264 | return r; /* 0 = success */ |
265 | #else |
266 | /* For testing */ |
267 | dbg1_error_msg("load_module('%s','%s')", fname, options); |
268 | return 1; |
269 | #endif |
270 | } |
271 | |
272 | /* Returns !0 if open/read was unsuccessful */ |
273 | static int parse_module(module_info *info, const char *pathname) |
274 | { |
275 | char *module_image; |
276 | char *ptr; |
277 | size_t len; |
278 | size_t pos; |
279 | dbg1_error_msg("parse_module('%s')", pathname); |
280 | |
281 | /* Read (possibly compressed) module */ |
282 | errno = 0; |
283 | len = 64 * 1024 * 1024; /* 64 Mb at most */ |
284 | module_image = xmalloc_open_zipped_read_close(pathname, &len); |
285 | /* module_image == NULL is ok here, find_keyword handles it */ |
286 | //TODO: optimize redundant module body reads |
287 | |
288 | /* "alias1 symbol:sym1 alias2 symbol:sym2" */ |
289 | reset_stringbuf(); |
290 | pos = 0; |
291 | while (1) { |
292 | unsigned start = stringbuf_idx; |
293 | ptr = find_keyword(module_image + pos, len - pos, "alias="); |
294 | if (!ptr) { |
295 | ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_"); |
296 | if (!ptr) |
297 | break; |
298 | /* DOCME: __ksymtab_gpl and __ksymtab_strings occur |
299 | * in many modules. What do they mean? */ |
300 | if (strcmp(ptr, "gpl") == 0 || strcmp(ptr, "strings") == 0) |
301 | goto skip; |
302 | dbg2_error_msg("alias:'symbol:%s'", ptr); |
303 | append("symbol:"); |
304 | } else { |
305 | dbg2_error_msg("alias:'%s'", ptr); |
306 | } |
307 | append(ptr); |
308 | appendc(' '); |
309 | /* |
310 | * Don't add redundant aliases, such as: |
311 | * libcrc32c.ko symbol:crc32c symbol:crc32c |
312 | */ |
313 | if (start) { /* "if we aren't the first alias" */ |
314 | char *found, *last; |
315 | stringbuf[stringbuf_idx] = '\0'; |
316 | last = stringbuf + start; |
317 | /* |
318 | * String at last-1 is " symbol:crc32c " |
319 | * (with both leading and trailing spaces). |
320 | */ |
321 | if (strncmp(stringbuf, last, stringbuf_idx - start) == 0) |
322 | /* First alias matches us */ |
323 | found = stringbuf; |
324 | else |
325 | /* Does any other alias match? */ |
326 | found = strstr(stringbuf, last-1); |
327 | if (found < last-1) { |
328 | /* There is absolutely the same string before us */ |
329 | dbg2_error_msg("redundant:'%s'", last); |
330 | stringbuf_idx = start; |
331 | goto skip; |
332 | } |
333 | } |
334 | skip: |
335 | pos = (ptr - module_image); |
336 | } |
337 | bksp(); /* remove last ' ' */ |
338 | info->aliases = copy_stringbuf(); |
339 | replace(info->aliases, '-', '_'); |
340 | |
341 | /* "dependency1 depandency2" */ |
342 | reset_stringbuf(); |
343 | ptr = find_keyword(module_image, len, "depends="); |
344 | if (ptr && *ptr) { |
345 | replace(ptr, ',', ' '); |
346 | replace(ptr, '-', '_'); |
347 | dbg2_error_msg("dep:'%s'", ptr); |
348 | append(ptr); |
349 | } |
350 | free(module_image); |
351 | info->deps = copy_stringbuf(); |
352 | |
353 | info->open_read_failed = (module_image == NULL); |
354 | return info->open_read_failed; |
355 | } |
356 | |
357 | static FAST_FUNC int fileAction(const char *pathname, |
358 | struct stat *sb UNUSED_PARAM, |
359 | void *modname_to_match, |
360 | int depth UNUSED_PARAM) |
361 | { |
362 | int cur; |
363 | const char *fname; |
364 | |
365 | pathname += 2; /* skip "./" */ |
366 | fname = bb_get_last_path_component_nostrip(pathname); |
367 | if (!strrstr(fname, ".ko")) { |
368 | dbg1_error_msg("'%s' is not a module", pathname); |
369 | return TRUE; /* not a module, continue search */ |
370 | } |
371 | |
372 | cur = module_count++; |
373 | modinfo = xrealloc_vector(modinfo, 12, cur); |
374 | modinfo[cur].pathname = xstrdup(pathname); |
375 | /*modinfo[cur].aliases = NULL; - xrealloc_vector did it */ |
376 | /*modinfo[cur+1].pathname = NULL;*/ |
377 | |
378 | if (!pathname_matches_modname(fname, modname_to_match)) { |
379 | dbg1_error_msg("'%s' module name doesn't match", pathname); |
380 | return TRUE; /* module name doesn't match, continue search */ |
381 | } |
382 | |
383 | dbg1_error_msg("'%s' module name matches", pathname); |
384 | module_found_idx = cur; |
385 | if (parse_module(&modinfo[cur], pathname) != 0) |
386 | return TRUE; /* failed to open/read it, no point in trying loading */ |
387 | |
388 | if (!(option_mask32 & OPT_r)) { |
389 | if (load_module(pathname, module_load_options) == 0) { |
390 | /* Load was successful, there is nothing else to do. |
391 | * This can happen ONLY for "top-level" module load, |
392 | * not a dep, because deps dont do dirscan. */ |
393 | exit(EXIT_SUCCESS); |
394 | } |
395 | } |
396 | |
397 | return TRUE; |
398 | } |
399 | |
400 | static int load_dep_bb(void) |
401 | { |
402 | char *line; |
403 | FILE *fp = fopen_for_read(DEPFILE_BB); |
404 | |
405 | if (!fp) |
406 | return 0; |
407 | |
408 | dep_bb_seen = 1; |
409 | dbg1_error_msg("loading "DEPFILE_BB); |
410 | |
411 | /* Why? There is a rare scenario: we did not find modprobe.dep.bb, |
412 | * we scanned the dir and found no module by name, then we search |
413 | * for alias (full scan), and we decided to generate modprobe.dep.bb. |
414 | * But we see modprobe.dep.bb.new! Other modprobe is at work! |
415 | * We wait and other modprobe renames it to modprobe.dep.bb. |
416 | * Now we can use it. |
417 | * But we already have modinfo[] filled, and "module_count = 0" |
418 | * makes us start anew. Yes, we leak modinfo[].xxx pointers - |
419 | * there is not much of data there anyway. */ |
420 | module_count = 0; |
421 | memset(&modinfo[0], 0, sizeof(modinfo[0])); |
422 | |
423 | while ((line = xmalloc_fgetline(fp)) != NULL) { |
424 | char* space; |
425 | char* linebuf; |
426 | int cur; |
427 | |
428 | if (!line[0]) { |
429 | free(line); |
430 | continue; |
431 | } |
432 | space = strchrnul(line, ' '); |
433 | cur = module_count++; |
434 | modinfo = xrealloc_vector(modinfo, 12, cur); |
435 | /*modinfo[cur+1].pathname = NULL; - xrealloc_vector did it */ |
436 | modinfo[cur].pathname = line; /* we take ownership of malloced block here */ |
437 | if (*space) |
438 | *space++ = '\0'; |
439 | modinfo[cur].aliases = space; |
440 | linebuf = xmalloc_fgetline(fp); |
441 | modinfo[cur].deps = linebuf ? linebuf : xzalloc(1); |
442 | if (modinfo[cur].deps[0]) { |
443 | /* deps are not "", so next line must be empty */ |
444 | line = xmalloc_fgetline(fp); |
445 | /* Refuse to work with damaged config file */ |
446 | if (line && line[0]) |
447 | bb_error_msg_and_die("error in %s at '%s'", DEPFILE_BB, line); |
448 | free(line); |
449 | } |
450 | } |
451 | return 1; |
452 | } |
453 | |
454 | static int start_dep_bb_writeout(void) |
455 | { |
456 | int fd; |
457 | |
458 | /* depmod -n: write result to stdout */ |
459 | if (applet_name[0] == 'd' && (option_mask32 & 1)) |
460 | return STDOUT_FILENO; |
461 | |
462 | fd = open(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0644); |
463 | if (fd < 0) { |
464 | if (errno == EEXIST) { |
465 | int count = 5 * 20; |
466 | dbg1_error_msg(DEPFILE_BB".new exists, waiting for "DEPFILE_BB); |
467 | while (1) { |
468 | usleep(1000*1000 / 20); |
469 | if (load_dep_bb()) { |
470 | dbg1_error_msg(DEPFILE_BB" appeared"); |
471 | return -2; /* magic number */ |
472 | } |
473 | if (!--count) |
474 | break; |
475 | } |
476 | bb_error_msg("deleting stale %s", DEPFILE_BB".new"); |
477 | fd = open_or_warn(DEPFILE_BB".new", O_WRONLY | O_CREAT | O_TRUNC); |
478 | } |
479 | } |
480 | dbg1_error_msg("opened "DEPFILE_BB".new:%d", fd); |
481 | return fd; |
482 | } |
483 | |
484 | static void write_out_dep_bb(int fd) |
485 | { |
486 | int i; |
487 | FILE *fp; |
488 | |
489 | /* We want good error reporting. fdprintf is not good enough. */ |
490 | fp = xfdopen_for_write(fd); |
491 | i = 0; |
492 | while (modinfo[i].pathname) { |
493 | fprintf(fp, "%s%s%s\n" "%s%s\n", |
494 | modinfo[i].pathname, modinfo[i].aliases[0] ? " " : "", modinfo[i].aliases, |
495 | modinfo[i].deps, modinfo[i].deps[0] ? "\n" : ""); |
496 | i++; |
497 | } |
498 | /* Badly formatted depfile is a no-no. Be paranoid. */ |
499 | errno = 0; |
500 | if (ferror(fp) | fclose(fp)) /* | instead of || is intended */ |
501 | goto err; |
502 | |
503 | if (fd == STDOUT_FILENO) /* it was depmod -n */ |
504 | goto ok; |
505 | |
506 | if (rename(DEPFILE_BB".new", DEPFILE_BB) != 0) { |
507 | err: |
508 | bb_perror_msg("can't create '%s'", DEPFILE_BB); |
509 | unlink(DEPFILE_BB".new"); |
510 | } else { |
511 | ok: |
512 | wrote_dep_bb_ok = 1; |
513 | dbg1_error_msg("created "DEPFILE_BB); |
514 | } |
515 | } |
516 | |
517 | static module_info** find_alias(const char *alias) |
518 | { |
519 | int i; |
520 | int dep_bb_fd; |
521 | int infoidx; |
522 | module_info **infovec; |
523 | dbg1_error_msg("find_alias('%s')", alias); |
524 | |
525 | try_again: |
526 | /* First try to find by name (cheaper) */ |
527 | i = 0; |
528 | while (modinfo[i].pathname) { |
529 | if (pathname_matches_modname(modinfo[i].pathname, alias)) { |
530 | dbg1_error_msg("found '%s' in module '%s'", |
531 | alias, modinfo[i].pathname); |
532 | if (!modinfo[i].aliases) { |
533 | parse_module(&modinfo[i], modinfo[i].pathname); |
534 | } |
535 | infovec = xzalloc(2 * sizeof(infovec[0])); |
536 | infovec[0] = &modinfo[i]; |
537 | return infovec; |
538 | } |
539 | i++; |
540 | } |
541 | |
542 | /* Ok, we definitely have to scan module bodies. This is a good |
543 | * moment to generate modprobe.dep.bb, if it does not exist yet */ |
544 | dep_bb_fd = dep_bb_seen ? -1 : start_dep_bb_writeout(); |
545 | if (dep_bb_fd == -2) /* modprobe.dep.bb appeared? */ |
546 | goto try_again; |
547 | |
548 | /* Scan all module bodies, extract modinfo (it contains aliases) */ |
549 | i = 0; |
550 | infoidx = 0; |
551 | infovec = NULL; |
552 | while (modinfo[i].pathname) { |
553 | char *desc, *s; |
554 | if (!modinfo[i].aliases) { |
555 | parse_module(&modinfo[i], modinfo[i].pathname); |
556 | } |
557 | /* "alias1 symbol:sym1 alias2 symbol:sym2" */ |
558 | desc = str_2_list(modinfo[i].aliases); |
559 | /* Does matching substring exist? */ |
560 | for (s = desc; *s; s += strlen(s) + 1) { |
561 | /* Aliases in module bodies can be defined with |
562 | * shell patterns. Example: |
563 | * "pci:v000010DEd000000D9sv*sd*bc*sc*i*". |
564 | * Plain strcmp() won't catch that */ |
565 | if (fnmatch(s, alias, 0) == 0) { |
566 | dbg1_error_msg("found alias '%s' in module '%s'", |
567 | alias, modinfo[i].pathname); |
568 | infovec = xrealloc_vector(infovec, 1, infoidx); |
569 | infovec[infoidx++] = &modinfo[i]; |
570 | break; |
571 | } |
572 | } |
573 | free(desc); |
574 | i++; |
575 | } |
576 | |
577 | /* Create module.dep.bb if needed */ |
578 | if (dep_bb_fd >= 0) { |
579 | write_out_dep_bb(dep_bb_fd); |
580 | } |
581 | |
582 | dbg1_error_msg("find_alias '%s' returns %d results", alias, infoidx); |
583 | return infovec; |
584 | } |
585 | |
586 | #if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED |
587 | // TODO: open only once, invent config_rewind() |
588 | static int already_loaded(const char *name) |
589 | { |
590 | int ret; |
591 | char *line; |
592 | FILE *fp; |
593 | |
594 | ret = 5 * 2; |
595 | again: |
596 | fp = fopen_for_read("/proc/modules"); |
597 | if (!fp) |
598 | return 0; |
599 | while ((line = xmalloc_fgetline(fp)) != NULL) { |
600 | char *live; |
601 | char *after_name; |
602 | |
603 | // Examples from kernel 3.14.6: |
604 | //pcspkr 12718 0 - Live 0xffffffffa017e000 |
605 | //snd_timer 28690 2 snd_seq,snd_pcm, Live 0xffffffffa025e000 |
606 | //i915 801405 2 - Live 0xffffffffa0096000 |
607 | after_name = is_prefixed_with(line, name); |
608 | if (!after_name || *after_name != ' ') { |
609 | free(line); |
610 | continue; |
611 | } |
612 | live = strstr(line, " Live"); |
613 | free(line); |
614 | if (!live) { |
615 | /* State can be Unloading, Loading, or Live. |
616 | * modprobe must not return prematurely if we see "Loading": |
617 | * it can cause further programs to assume load completed, |
618 | * but it did not (yet)! |
619 | * Wait up to 5*20 ms for it to resolve. |
620 | */ |
621 | ret -= 2; |
622 | if (ret == 0) |
623 | break; /* huh? report as "not loaded" */ |
624 | fclose(fp); |
625 | usleep(20*1000); |
626 | goto again; |
627 | } |
628 | ret = 1; |
629 | break; |
630 | } |
631 | fclose(fp); |
632 | |
633 | return ret & 1; |
634 | } |
635 | #else |
636 | #define already_loaded(name) 0 |
637 | #endif |
638 | |
639 | static int rmmod(const char *filename) |
640 | { |
641 | int r; |
642 | char modname[MODULE_NAME_LEN]; |
643 | |
644 | filename2modname(filename, modname); |
645 | r = delete_module(modname, O_NONBLOCK | O_EXCL); |
646 | dbg1_error_msg("delete_module('%s', O_NONBLOCK | O_EXCL):%d", modname, r); |
647 | if (r != 0 && !(option_mask32 & OPT_q)) { |
648 | bb_perror_msg("remove '%s'", modname); |
649 | } |
650 | return r; |
651 | } |
652 | |
653 | /* |
654 | * Given modules definition and module name (or alias, or symbol) |
655 | * load/remove the module respecting dependencies. |
656 | * NB: also called by depmod with bogus name "/", |
657 | * just in order to force modprobe.dep.bb creation. |
658 | */ |
659 | #if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE |
660 | #define process_module(a,b) process_module(a) |
661 | #define cmdline_options "" |
662 | #endif |
663 | static int process_module(char *name, const char *cmdline_options) |
664 | { |
665 | char *s, *deps, *options; |
666 | module_info **infovec; |
667 | module_info *info; |
668 | int infoidx; |
669 | int is_remove = (option_mask32 & OPT_r) != 0; |
670 | int exitcode = EXIT_SUCCESS; |
671 | |
672 | dbg1_error_msg("process_module('%s','%s')", name, cmdline_options); |
673 | |
674 | replace(name, '-', '_'); |
675 | |
676 | dbg1_error_msg("already_loaded:%d is_remove:%d", already_loaded(name), is_remove); |
677 | |
678 | if (applet_name[0] == 'r') { |
679 | /* rmmod. |
680 | * Does not remove dependencies, no need to scan, just remove. |
681 | * (compat note: this allows and strips .ko suffix) |
682 | */ |
683 | rmmod(name); |
684 | return EXIT_SUCCESS; |
685 | } |
686 | |
687 | /* |
688 | * We used to have "is_remove != already_loaded(name)" check here, but |
689 | * modprobe -r pci:v00008086d00007010sv00000000sd00000000bc01sc01i80 |
690 | * won't unload modules (there are more than one) |
691 | * which have this alias. |
692 | */ |
693 | if (!is_remove && already_loaded(name)) { |
694 | dbg1_error_msg("nothing to do for '%s'", name); |
695 | return EXIT_SUCCESS; |
696 | } |
697 | |
698 | options = NULL; |
699 | if (!is_remove) { |
700 | char *opt_filename = xasprintf("/etc/modules/%s", name); |
701 | options = xmalloc_open_read_close(opt_filename, NULL); |
702 | if (options) |
703 | replace(options, '\n', ' '); |
704 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE |
705 | if (cmdline_options) { |
706 | /* NB: cmdline_options always have one leading ' ' |
707 | * (see main()), we remove it here */ |
708 | char *op = xasprintf(options ? "%s %s" : "%s %s" + 3, |
709 | cmdline_options + 1, options); |
710 | free(options); |
711 | options = op; |
712 | } |
713 | #endif |
714 | free(opt_filename); |
715 | module_load_options = options; |
716 | dbg1_error_msg("process_module('%s'): options:'%s'", name, options); |
717 | } |
718 | |
719 | if (!module_count) { |
720 | /* Scan module directory. This is done only once. |
721 | * It will attempt module load, and will exit(EXIT_SUCCESS) |
722 | * on success. |
723 | */ |
724 | module_found_idx = -1; |
725 | recursive_action(".", |
726 | ACTION_RECURSE, /* flags */ |
727 | fileAction, /* file action */ |
728 | NULL, /* dir action */ |
729 | name, /* user data */ |
730 | 0 /* depth */ |
731 | ); |
732 | dbg1_error_msg("dirscan complete"); |
733 | /* Module was not found, or load failed, or is_remove */ |
734 | if (module_found_idx >= 0) { /* module was found */ |
735 | infovec = xzalloc(2 * sizeof(infovec[0])); |
736 | infovec[0] = &modinfo[module_found_idx]; |
737 | } else { /* search for alias, not a plain module name */ |
738 | infovec = find_alias(name); |
739 | } |
740 | } else { |
741 | infovec = find_alias(name); |
742 | } |
743 | |
744 | if (!infovec) { |
745 | /* both dirscan and find_alias found nothing */ |
746 | if (!is_remove && applet_name[0] != 'd') /* it wasn't rmmod or depmod */ |
747 | bb_error_msg("module '%s' not found", name); |
748 | //TODO: _and_die()? or should we continue (un)loading modules listed on cmdline? |
749 | goto ret; |
750 | } |
751 | |
752 | /* There can be more than one module for the given alias. For example, |
753 | * "pci:v00008086d00007010sv00000000sd00000000bc01sc01i80" matches |
754 | * ata_piix because it has alias "pci:v00008086d00007010sv*sd*bc*sc*i*" |
755 | * and ata_generic, it has alias "pci:v*d*sv*sd*bc01sc01i*" |
756 | * Standard modprobe loads them both. We achieve it by returning |
757 | * a *list* of modinfo pointers from find_alias(). |
758 | */ |
759 | |
760 | /* modprobe -r? unload module(s) */ |
761 | if (is_remove) { |
762 | infoidx = 0; |
763 | while ((info = infovec[infoidx++]) != NULL) { |
764 | int r = rmmod(bb_get_last_path_component_nostrip(info->pathname)); |
765 | if (r != 0) { |
766 | goto ret; /* error */ |
767 | } |
768 | } |
769 | /* modprobe -r: we do not stop here - |
770 | * continue to unload modules on which the module depends: |
771 | * "-r --remove: option causes modprobe to remove a module. |
772 | * If the modules it depends on are also unused, modprobe |
773 | * will try to remove them, too." |
774 | */ |
775 | } |
776 | |
777 | infoidx = 0; |
778 | while ((info = infovec[infoidx++]) != NULL) { |
779 | /* Iterate thru dependencies, trying to (un)load them */ |
780 | deps = str_2_list(info->deps); |
781 | for (s = deps; *s; s += strlen(s) + 1) { |
782 | //if (strcmp(name, s) != 0) // N.B. do loops exist? |
783 | dbg1_error_msg("recurse on dep '%s'", s); |
784 | process_module(s, NULL); |
785 | dbg1_error_msg("recurse on dep '%s' done", s); |
786 | } |
787 | free(deps); |
788 | |
789 | if (is_remove) |
790 | continue; |
791 | |
792 | /* We are modprobe: load it */ |
793 | if (options && strstr(options, "blacklist")) { |
794 | dbg1_error_msg("'%s': blacklisted", info->pathname); |
795 | continue; |
796 | } |
797 | if (info->open_read_failed) { |
798 | /* We already tried it, didn't work. Don't try load again */ |
799 | exitcode = EXIT_FAILURE; |
800 | continue; |
801 | } |
802 | errno = 0; |
803 | if (load_module(info->pathname, options) != 0) { |
804 | if (EEXIST != errno) { |
805 | bb_error_msg("'%s': %s", |
806 | info->pathname, |
807 | moderror(errno)); |
808 | } else { |
809 | dbg1_error_msg("'%s': %s", |
810 | info->pathname, |
811 | moderror(errno)); |
812 | } |
813 | exitcode = EXIT_FAILURE; |
814 | } |
815 | } |
816 | ret: |
817 | free(infovec); |
818 | free(options); |
819 | |
820 | return exitcode; |
821 | } |
822 | #undef cmdline_options |
823 | |
824 | |
825 | /* For reference, module-init-tools v3.4 options: |
826 | |
827 | # insmod |
828 | Usage: insmod filename [args] |
829 | |
830 | # rmmod --help |
831 | Usage: rmmod [-fhswvV] modulename ... |
832 | -f (or --force) forces a module unload, and may crash your |
833 | machine. This requires the Forced Module Removal option |
834 | when the kernel was compiled. |
835 | -h (or --help) prints this help text |
836 | -s (or --syslog) says use syslog, not stderr |
837 | -v (or --verbose) enables more messages |
838 | -V (or --version) prints the version code |
839 | -w (or --wait) begins module removal even if it is used |
840 | and will stop new users from accessing the module (so it |
841 | should eventually fall to zero). |
842 | |
843 | # modprobe |
844 | Usage: modprobe [-v] [-V] [-C config-file] [-n] [-i] [-q] [-b] |
845 | [-o <modname>] [ --dump-modversions ] <modname> [parameters...] |
846 | modprobe -r [-n] [-i] [-v] <modulename> ... |
847 | modprobe -l -t <dirname> [ -a <modulename> ...] |
848 | |
849 | # depmod --help |
850 | depmod 3.4 -- part of module-init-tools |
851 | depmod -[aA] [-n -e -v -q -V -r -u] |
852 | [-b basedirectory] [forced_version] |
853 | depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.ko module2.ko ... |
854 | If no arguments (except options) are given, "depmod -a" is assumed. |
855 | depmod will output a dependency list suitable for the modprobe utility. |
856 | Options: |
857 | -a, --all Probe all modules |
858 | -A, --quick Only does the work if there's a new module |
859 | -n, --show Write the dependency file on stdout only |
860 | -e, --errsyms Report not supplied symbols |
861 | -V, --version Print the release version |
862 | -v, --verbose Enable verbose mode |
863 | -h, --help Print this usage message |
864 | The following options are useful for people managing distributions: |
865 | -b basedirectory |
866 | --basedir basedirectory |
867 | Use an image of a module tree |
868 | -F kernelsyms |
869 | --filesyms kernelsyms |
870 | Use the file instead of the current kernel symbols |
871 | */ |
872 | |
873 | //usage:#if ENABLE_MODPROBE_SMALL |
874 | |
875 | //usage:#define depmod_trivial_usage NOUSAGE_STR |
876 | //usage:#define depmod_full_usage "" |
877 | |
878 | //usage:#define lsmod_trivial_usage |
879 | //usage: "" |
880 | //usage:#define lsmod_full_usage "\n\n" |
881 | //usage: "List the currently loaded kernel modules" |
882 | |
883 | //usage:#define insmod_trivial_usage |
884 | //usage: IF_FEATURE_2_4_MODULES("[OPTIONS] MODULE ") |
885 | //usage: IF_NOT_FEATURE_2_4_MODULES("FILE ") |
886 | //usage: "[SYMBOL=VALUE]..." |
887 | //usage:#define insmod_full_usage "\n\n" |
888 | //usage: "Load kernel module" |
889 | //usage: IF_FEATURE_2_4_MODULES( "\n" |
890 | //usage: "\n -f Force module to load into the wrong kernel version" |
891 | //usage: "\n -k Make module autoclean-able" |
892 | //usage: "\n -v Verbose" |
893 | //usage: "\n -q Quiet" |
894 | //usage: "\n -L Lock: prevent simultaneous loads" |
895 | //usage: IF_FEATURE_INSMOD_LOAD_MAP( |
896 | //usage: "\n -m Output load map to stdout" |
897 | //usage: ) |
898 | //usage: "\n -x Don't export externs" |
899 | //usage: ) |
900 | |
901 | //usage:#define rmmod_trivial_usage |
902 | //usage: "[-wfa] [MODULE]..." |
903 | //usage:#define rmmod_full_usage "\n\n" |
904 | //usage: "Unload kernel modules\n" |
905 | //usage: "\n -w Wait until the module is no longer used" |
906 | //usage: "\n -f Force unload" |
907 | //usage: "\n -a Remove all unused modules (recursively)" |
908 | //usage: |
909 | //usage:#define rmmod_example_usage |
910 | //usage: "$ rmmod tulip\n" |
911 | |
912 | //usage:#define modprobe_trivial_usage |
913 | //usage: "[-qfwrsv] MODULE [SYMBOL=VALUE]..." |
914 | //usage:#define modprobe_full_usage "\n\n" |
915 | //usage: " -r Remove MODULE (stacks) or do autoclean" |
916 | //usage: "\n -q Quiet" |
917 | //usage: "\n -v Verbose" |
918 | //usage: "\n -f Force" |
919 | //usage: "\n -w Wait for unload" |
920 | //usage: "\n -s Report via syslog instead of stderr" |
921 | |
922 | //usage:#endif |
923 | |
924 | int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
925 | int modprobe_main(int argc UNUSED_PARAM, char **argv) |
926 | { |
927 | int exitcode; |
928 | struct utsname uts; |
929 | char applet0 = applet_name[0]; |
930 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;) |
931 | |
932 | /* are we lsmod? -> just dump /proc/modules */ |
933 | if (ENABLE_LSMOD && 'l' == applet0) { |
934 | xprint_and_close_file(xfopen_for_read("/proc/modules")); |
935 | return EXIT_SUCCESS; |
936 | } |
937 | |
938 | INIT_G(); |
939 | |
940 | /* Prevent ugly corner cases with no modules at all */ |
941 | modinfo = xzalloc(sizeof(modinfo[0])); |
942 | |
943 | if (!ENABLE_INSMOD || 'i' != applet0) { /* not insmod */ |
944 | /* Goto modules directory */ |
945 | xchdir(CONFIG_DEFAULT_MODULES_DIR); |
946 | } |
947 | uname(&uts); /* never fails */ |
948 | |
949 | /* depmod? */ |
950 | if (ENABLE_DEPMOD && 'd' == applet0) { |
951 | /* Supported: |
952 | * -n: print result to stdout |
953 | * -a: process all modules (default) |
954 | * optional VERSION parameter |
955 | * Ignored: |
956 | * -A: do work only if a module is newer than depfile |
957 | * -e: report any symbols which a module needs |
958 | * which are not supplied by other modules or the kernel |
959 | * -F FILE: System.map (symbols for -e) |
960 | * -q, -r, -u: noop? |
961 | * Not supported: |
962 | * -b BASEDIR: (TODO!) modules are in |
963 | * $BASEDIR/lib/modules/$VERSION |
964 | * -v: human readable deps to stdout |
965 | * -V: version (don't want to support it - people may depend |
966 | * on it as an indicator of "standard" depmod) |
967 | * -h: help (well duh) |
968 | * module1.o module2.o parameters (just ignored for now) |
969 | */ |
970 | getopt32(argv, "na" "AeF:qru" /* "b:vV", NULL */, NULL); |
971 | argv += optind; |
972 | /* if (argv[0] && argv[1]) bb_show_usage(); */ |
973 | /* Goto $VERSION directory */ |
974 | xchdir(argv[0] ? argv[0] : uts.release); |
975 | /* Force full module scan by asking to find a bogus module. |
976 | * This will generate modules.dep.bb as a side effect. */ |
977 | process_module((char*)"/", NULL); |
978 | return !wrote_dep_bb_ok; |
979 | } |
980 | |
981 | /* insmod, modprobe, rmmod require at least one argument */ |
982 | opt_complementary = "-1"; |
983 | /* only -q (quiet) and -r (rmmod), |
984 | * the rest are accepted and ignored (compat) */ |
985 | getopt32(argv, "qrfsvwb"); |
986 | argv += optind; |
987 | |
988 | /* are we rmmod? -> simulate modprobe -r */ |
989 | if (ENABLE_RMMOD && 'r' == applet0) { |
990 | option_mask32 |= OPT_r; |
991 | } |
992 | |
993 | if (!ENABLE_INSMOD || 'i' != applet0) { /* not insmod */ |
994 | /* Goto $VERSION directory */ |
995 | xchdir(uts.release); |
996 | } |
997 | |
998 | #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE |
999 | /* If not rmmod/-r, parse possible module options given on command line. |
1000 | * insmod/modprobe takes one module name, the rest are parameters. */ |
1001 | options = NULL; |
1002 | if (!(option_mask32 & OPT_r)) { |
1003 | char **arg = argv; |
1004 | while (*++arg) { |
1005 | /* Enclose options in quotes */ |
1006 | char *s = options; |
1007 | options = xasprintf("%s \"%s\"", s ? s : "", *arg); |
1008 | free(s); |
1009 | *arg = NULL; |
1010 | } |
1011 | } |
1012 | #else |
1013 | if (!(option_mask32 & OPT_r)) |
1014 | argv[1] = NULL; |
1015 | #endif |
1016 | |
1017 | if (ENABLE_INSMOD && 'i' == applet0) { /* insmod */ |
1018 | size_t len; |
1019 | void *map; |
1020 | |
1021 | len = MAXINT(ssize_t); |
1022 | map = xmalloc_open_zipped_read_close(*argv, &len); |
1023 | if (!map) |
1024 | bb_perror_msg_and_die("can't read '%s'", *argv); |
1025 | if (init_module(map, len, |
1026 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(options ? options : "") |
1027 | IF_NOT_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE("") |
1028 | ) != 0 |
1029 | ) { |
1030 | bb_error_msg_and_die("can't insert '%s': %s", |
1031 | *argv, moderror(errno)); |
1032 | } |
1033 | return EXIT_SUCCESS; |
1034 | } |
1035 | |
1036 | /* Try to load modprobe.dep.bb */ |
1037 | if (!ENABLE_RMMOD || 'r' != applet0) { /* not rmmod */ |
1038 | load_dep_bb(); |
1039 | } |
1040 | |
1041 | /* Load/remove modules. |
1042 | * Only rmmod/modprobe -r loops here, insmod/modprobe has only argv[0] */ |
1043 | exitcode = EXIT_SUCCESS; |
1044 | do { |
1045 | exitcode |= process_module(*argv, options); |
1046 | } while (*++argv); |
1047 | |
1048 | if (ENABLE_FEATURE_CLEAN_UP) { |
1049 | IF_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);) |
1050 | } |
1051 | return exitcode; |
1052 | } |
1053 |