1 /* vi: set sw=4 ts=4: */
5 * Copyright (c) 2008 Vladimir Dronnikov
6 * Copyright (c) 2008 Bernhard Fischer (initial depmod code)
8 * Licensed under GPLv2, see file LICENSE in this tarball for details.
12 #include "unarchive.h"
14 #include <sys/utsname.h> /* uname() */
17 #define dbg1_error_msg(...) ((void)0)
18 #define dbg2_error_msg(...) ((void)0)
19 //#define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
20 //#define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
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);
27 OPT_q = (1 << 0), /* be quiet */
28 OPT_r = (1 << 1), /* module removal instead of loading */
31 typedef struct module_info {
41 char *module_load_options;
45 char stringbuf[32 * 1024]; /* some modules have lots of stuff */
46 /* for example, drivers/media/video/saa7134/saa7134.ko */
48 #define G (*ptr_to_globals)
49 #define modinfo (G.modinfo )
50 #define module_count (G.module_count )
51 #define module_found_idx (G.module_found_idx )
52 #define module_load_options (G.module_load_options)
53 #define stringbuf_idx (G.stringbuf_idx )
54 #define stringbuf (G.stringbuf )
55 #define INIT_G() do { \
56 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
60 static void appendc(char c)
62 if (stringbuf_idx < sizeof(stringbuf))
63 stringbuf[stringbuf_idx++] = c;
66 static void append(const char *s)
68 size_t len = strlen(s);
69 if (stringbuf_idx + len < sizeof(stringbuf)) {
70 memcpy(stringbuf + stringbuf_idx, s, len);
75 static void reset_stringbuf(void)
80 static char* copy_stringbuf(void)
82 char *copy = xmalloc(stringbuf_idx);
83 return memcpy(copy, stringbuf, stringbuf_idx);
86 static char* find_keyword(char *ptr, size_t len, const char *word)
90 if (!ptr) /* happens if read_module cannot read it */
95 while ((ssize_t)len > 0) {
97 /* search for the first char in word */
98 ptr = memchr(ptr, *word, len);
99 if (ptr == NULL) /* no occurance left, done */
101 if (strncmp(ptr, word, wlen) == 0)
102 return ptr + wlen; /* found, return ptr past it */
109 static void replace(char *s, char what, char with)
118 #if ENABLE_FEATURE_MODPROBE_SMALL_ZIPPED
119 static char *xmalloc_open_zipped_read_close(const char *fname, size_t *sizep)
125 int fd = open_or_warn(fname, O_RDONLY);
129 suffix = strrchr(fname, '.');
131 if (strcmp(suffix, ".gz") == 0)
132 fd = open_transformer(fd, unpack_gz_stream, "gunzip");
133 else if (strcmp(suffix, ".bz2") == 0)
134 fd = open_transformer(fd, unpack_bz2_stream, "bunzip2");
137 len = (sizep) ? *sizep : 64 * 1024 * 1024;
138 image = xmalloc_read(fd, &len);
140 bb_perror_msg("read error from '%s'", fname);
147 # define read_module xmalloc_open_zipped_read_close
149 # define read_module xmalloc_open_read_close
152 /* We use error numbers in a loose translation... */
153 static const char *moderror(int err)
157 return "invalid module format";
159 return "unknown symbol in module or invalid parameter";
161 return "module has wrong symbol version";
162 case EINVAL: /* "invalid parameter" */
163 return "unknown symbol in module or invalid parameter"
164 + sizeof("unknown symbol in module or");
166 return strerror(err);
170 static int load_module(const char *fname, const char *options)
174 size_t len = MAXINT(ssize_t);
176 dbg1_error_msg("load_module('%s','%s')", fname, options);
178 module_image = read_module(fname, &len);
179 r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
181 dbg1_error_msg("load_module:%d", r);
182 return r; /* 0 = success */
185 dbg1_error_msg("load_module('%s','%s')", fname, options);
190 static char* parse_module(const char *pathname, const char *name)
196 dbg1_error_msg("parse_module('%s','%s')", pathname, name);
198 /* Read (possibly compressed) module */
199 len = 64 * 1024 * 1024; /* 64 Mb at most */
200 module_image = read_module(pathname, &len);
204 /* First desc line's format is
205 * "modname alias1 symbol:sym1 alias2 symbol:sym2 " (note trailing ' ')
212 ptr = find_keyword(module_image + pos, len - pos, "alias=");
214 ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
217 /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
218 * in many modules. What do they mean? */
219 if (strcmp(ptr, "gpl") != 0 && strcmp(ptr, "strings") != 0) {
220 dbg2_error_msg("alias: 'symbol:%s'", ptr);
224 dbg2_error_msg("alias: '%s'", ptr);
228 pos = (ptr - module_image);
232 /* Second line: "dependency1 depandency2 " (note trailing ' ') */
233 ptr = find_keyword(module_image, len, "depends=");
235 replace(ptr, ',', ' ');
236 replace(ptr, '-', '_');
237 dbg2_error_msg("dep:'%s'", ptr);
240 appendc(' '); appendc('\0');
243 return copy_stringbuf();
246 static char* pathname_2_modname(const char *pathname)
248 const char *fname = bb_get_last_path_component_nostrip(pathname);
249 const char *suffix = strrstr(fname, ".ko");
250 char *name = xstrndup(fname, suffix - fname);
251 replace(name, '-', '_');
255 static FAST_FUNC int fileAction(const char *pathname,
256 struct stat *sb UNUSED_PARAM,
258 int depth UNUSED_PARAM)
264 pathname += 2; /* skip "./" */
265 fname = bb_get_last_path_component_nostrip(pathname);
266 if (!strrstr(fname, ".ko")) {
267 dbg1_error_msg("'%s' is not a module", pathname);
268 return TRUE; /* not a module, continue search */
271 cur = module_count++;
272 modinfo = xrealloc_vector(modinfo, 12, cur);
273 modinfo[cur].pathname = xstrdup(pathname);
274 modinfo[cur].desc = NULL;
275 modinfo[cur+1].pathname = NULL;
276 modinfo[cur+1].desc = NULL;
278 name = pathname_2_modname(fname);
279 if (strcmp(name, data) != 0) {
281 dbg1_error_msg("'%s' module name doesn't match", pathname);
282 return TRUE; /* module name doesn't match, continue search */
285 dbg1_error_msg("'%s' module name matches", pathname);
286 module_found_idx = cur;
287 modinfo[cur].desc = parse_module(pathname, name);
289 if (!(option_mask32 & OPT_r)) {
290 if (load_module(pathname, module_load_options) == 0) {
291 /* Load was successful, there is nothing else to do.
292 * This can happen ONLY for "top-level" module load,
293 * not a dep, because deps dont do dirscan. */
295 /*free(name);return RECURSE_RESULT_ABORT;*/
303 static module_info* find_alias(const char *alias)
306 dbg1_error_msg("find_alias('%s')", alias);
308 /* First try to find by name (cheaper) */
310 while (modinfo[i].pathname) {
311 char *name = pathname_2_modname(modinfo[i].pathname);
312 if (strcmp(name, alias) == 0) {
313 dbg1_error_msg("found '%s' in module '%s'",
314 alias, modinfo[i].pathname);
315 if (!modinfo[i].desc)
316 modinfo[i].desc = parse_module(modinfo[i].pathname, name);
324 /* Scan all module bodies, extract modinfo (it contains aliases) */
326 while (modinfo[i].pathname) {
328 if (!modinfo[i].desc) {
329 char *name = pathname_2_modname(modinfo[i].pathname);
330 modinfo[i].desc = parse_module(modinfo[i].pathname, name);
333 /* "modname alias1 symbol:sym1 alias2 symbol:sym2 " */
334 desc = xstrdup(modinfo[i].desc);
335 /* Does matching substring exist? */
336 replace(desc, ' ', '\0');
337 for (s = desc; *s; s += strlen(s) + 1) {
338 /* aliases in module bodies can be defined with
339 * shell patterns. Example:
340 * "pci:v000010DEd000000D9sv*sd*bc*sc*i*".
341 * Plain strcmp() won't catch that */
342 if (fnmatch(s, alias, 0) == 0) {
344 dbg1_error_msg("found alias '%s' in module '%s'",
345 alias, modinfo[i].pathname);
352 dbg1_error_msg("find_alias '%s' returns NULL", alias);
356 #if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
357 static int already_loaded(const char *name)
360 int len = strlen(name);
364 modules = xfopen("/proc/modules", "r");
365 while ((line = xmalloc_fgets(modules)) != NULL) {
366 if (strncmp(line, name, len) == 0 && line[len] == ' ') {
377 #define already_loaded(name) is_rmmod
381 Given modules definition and module name (or alias, or symbol)
382 load/remove the module respecting dependencies
384 #if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
385 #define process_module(a,b) process_module(a)
386 #define cmdline_options ""
388 static void process_module(char *name, const char *cmdline_options)
390 char *s, *deps, *options;
392 int is_rmmod = (option_mask32 & OPT_r) != 0;
393 dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
395 replace(name, '-', '_');
397 dbg1_error_msg("already_loaded:%d is_rmmod:%d", already_loaded(name), is_rmmod);
398 if (already_loaded(name) != is_rmmod) {
399 dbg1_error_msg("nothing to do for '%s'", name);
405 char *opt_filename = xasprintf("/etc/modules/%s", name);
406 options = xmalloc_open_read_close(opt_filename, NULL);
408 replace(options, '\n', ' ');
409 #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
410 if (cmdline_options) {
411 /* NB: cmdline_options always have one leading ' '
412 * (see main()), we remove it here */
413 char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
414 cmdline_options + 1, options);
420 module_load_options = options;
421 dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
425 /* Scan module directory. This is done only once.
426 * It will attempt module load, and will exit(EXIT_SUCCESS)
428 module_found_idx = -1;
429 recursive_action(".",
430 ACTION_RECURSE, /* flags */
431 fileAction, /* file action */
432 NULL, /* dir action */
433 name, /* user data */
435 dbg1_error_msg("dirscan complete");
436 /* Module was not found, or load failed, or is_rmmod */
437 if (module_found_idx >= 0) { /* module was found */
438 info = &modinfo[module_found_idx];
439 } else { /* search for alias, not a plain module name */
440 info = find_alias(name);
443 info = find_alias(name);
446 /* rmmod? unload it by name */
448 if (delete_module(name, O_NONBLOCK|O_EXCL) != 0
449 && !(option_mask32 & OPT_q)
451 bb_perror_msg("remove '%s'", name);
454 /* N.B. we do not stop here -
455 * continue to unload modules on which the module depends:
456 * "-r --remove: option causes modprobe to remove a module.
457 * If the modules it depends on are also unused, modprobe
458 * will try to remove them, too." */
461 if (!info) { /* both dirscan and find_alias found nothing */
465 /* Second line of desc contains dependencies */
466 deps = xstrdup(info->desc + strlen(info->desc) + 1);
468 /* Transform deps to string list */
469 replace(deps, ' ', '\0');
470 /* Iterate thru dependencies, trying to (un)load them */
471 for (s = deps; *s; s += strlen(s) + 1) {
472 //if (strcmp(name, s) != 0) // N.B. do loops exist?
473 dbg1_error_msg("recurse on dep '%s'", s);
474 process_module(s, NULL);
475 dbg1_error_msg("recurse on dep '%s' done", s);
479 /* insmod -> load it */
482 if (load_module(info->pathname, options) != 0) {
483 if (EEXIST != errno) {
484 bb_error_msg("insert '%s' %s: %s",
485 info->pathname, options,
488 dbg1_error_msg("insert '%s' %s: %s",
489 info->pathname, options,
496 //TODO: return load attempt result from process_module.
497 //If dep didn't load ok, continuing makes little sense.
499 #undef cmdline_options
502 /* For reference, module-init-tools-0.9.15-pre2 options:
505 Usage: insmod filename [args]
508 Usage: rmmod [-fhswvV] modulename ...
509 -f (or --force) forces a module unload, and may crash your machine.
510 -s (or --syslog) says use syslog, not stderr
511 -v (or --verbose) enables more messages
512 -w (or --wait) begins a module removal even if it is used
513 and will stop new users from accessing the module (so it
514 should eventually fall to zero).
517 Usage: modprobe [--verbose|--version|--config|--remove] filename [options]
520 depmod 0.9.15-pre2 -- part of module-init-tools
521 depmod -[aA] [-n -e -v -q -V -r -u] [-b basedirectory] [forced_version]
522 depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.o module2.o ...
523 If no arguments (except options) are given, "depmod -a" is assumed
525 depmod will output a dependancy list suitable for the modprobe utility.
528 -a, --all Probe all modules
529 -n, --show Write the dependency file on stdout only
531 --basedir basedirectory Use an image of a module tree.
533 --filesyms kernelsyms Use the file instead of the
534 current kernel symbols.
537 int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
538 int modprobe_main(int argc UNUSED_PARAM, char **argv)
541 char applet0 = applet_name[0];
542 USE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
544 /* depmod is a stub */
548 /* are we lsmod? -> just dump /proc/modules */
549 if ('l' == applet0) {
550 xprint_and_close_file(xfopen("/proc/modules", "r"));
556 /* insmod, modprobe, rmmod require at least one argument */
557 opt_complementary = "-1";
558 /* only -q (quiet) and -r (rmmod),
559 * the rest are accepted and ignored (compat) */
560 getopt32(argv, "qrfsvw");
563 /* are we rmmod? -> simulate modprobe -r */
564 if ('r' == applet0) {
565 option_mask32 |= OPT_r;
568 /* goto modules directory */
569 xchdir(CONFIG_DEFAULT_MODULES_DIR);
570 uname(&uts); /* never fails */
573 #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
574 /* If not rmmod, parse possible module options given on command line.
575 * insmod/modprobe takes one module name, the rest are parameters. */
577 if ('r' != applet0) {
580 /* Enclose options in quotes */
582 options = xasprintf("%s \"%s\"", s ? s : "", *arg);
592 /* Load/remove modules.
593 * Only rmmod loops here, insmod/modprobe has only argv[0] */
595 process_module(*argv++, options);
598 if (ENABLE_FEATURE_CLEAN_UP) {
599 USE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)