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() */
18 static void *xmalloc_read(int fd, size_t *sizep)
21 size_t size, rd_size, total;
25 to_read = sizep ? *sizep : INT_MAX; /* max to read */
27 /* Estimate file size */
28 st.st_size = 0; /* in case fstat fails, assume 0 */
30 /* /proc/N/stat files report st_size 0 */
31 /* In order to make such files readable, we add small const */
32 size = (st.st_size | 0x3ff) + 1;
39 buf = xrealloc(buf, total + size + 1);
40 rd_size = full_read(fd, buf + total, size);
41 if ((ssize_t)rd_size < 0) { /* error */
46 if (rd_size < size) /* EOF */
51 /* grow by 1/8, but in [1k..64k] bounds */
52 size = ((total / 8) | 0x3ff) + 1;
56 xrealloc(buf, total + 1);
65 //#define dbg1_error_msg(...) ((void)0)
66 //#define dbg2_error_msg(...) ((void)0)
67 #define dbg1_error_msg(...) bb_error_msg(__VA_ARGS__)
68 #define dbg2_error_msg(...) bb_error_msg(__VA_ARGS__)
70 extern int init_module(void *module, unsigned long len, const char *options);
71 extern int delete_module(const char *module, unsigned flags);
72 extern int query_module(const char *name, int which, void *buf, size_t bufsize, size_t *ret);
75 OPT_q = (1 << 0), /* be quiet */
76 OPT_r = (1 << 1), /* module removal instead of loading */
79 typedef struct module_info {
89 char *module_load_options;
93 char stringbuf[32 * 1024]; /* some modules have lots of stuff */
94 /* for example, drivers/media/video/saa7134/saa7134.ko */
96 #define G (*ptr_to_globals)
97 #define modinfo (G.modinfo )
98 #define module_count (G.module_count )
99 #define module_found_idx (G.module_found_idx )
100 #define module_load_options (G.module_load_options)
101 #define stringbuf_idx (G.stringbuf_idx )
102 #define stringbuf (G.stringbuf )
103 #define INIT_G() do { \
104 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
108 static void appendc(char c)
110 if (stringbuf_idx < sizeof(stringbuf))
111 stringbuf[stringbuf_idx++] = c;
114 static void append(const char *s)
116 size_t len = strlen(s);
117 if (stringbuf_idx + len < sizeof(stringbuf)) {
118 memcpy(stringbuf + stringbuf_idx, s, len);
119 stringbuf_idx += len;
123 static void reset_stringbuf(void)
128 static char* copy_stringbuf(void)
130 char *copy = xmalloc(stringbuf_idx);
131 return memcpy(copy, stringbuf, stringbuf_idx);
134 static char* find_keyword(char *ptr, size_t len, const char *word)
138 if (!ptr) /* happens if read_module cannot read it */
143 while ((ssize_t)len > 0) {
145 /* search for the first char in word */
146 ptr = memchr(ptr, *word, len);
147 if (ptr == NULL) /* no occurance left, done */
149 if (strncmp(ptr, word, wlen) == 0)
150 return ptr + wlen; /* found, return ptr past it */
157 static void replace(char *s, char what, char with)
166 #if ENABLE_FEATURE_MODPROBE_SMALL_ZIPPED
167 static char *xmalloc_open_zipped_read_close(const char *fname, size_t *sizep)
173 int fd = open_or_warn(fname, O_RDONLY);
177 suffix = strrchr(fname, '.');
179 if (strcmp(suffix, ".gz") == 0)
180 fd = open_transformer(fd, unpack_gz_stream, "gunzip");
181 else if (strcmp(suffix, ".bz2") == 0)
182 fd = open_transformer(fd, unpack_bz2_stream, "bunzip2");
185 len = (sizep) ? *sizep : 64 * 1024 * 1024;
186 image = xmalloc_read(fd, &len);
188 bb_perror_msg("read error from '%s'", fname);
195 # define read_module xmalloc_open_zipped_read_close
197 # define read_module xmalloc_open_read_close
200 /* We use error numbers in a loose translation... */
201 static const char *moderror(int err)
205 return "invalid module format";
207 return "unknown symbol in module or invalid parameter";
209 return "module has wrong symbol version";
210 case EINVAL: /* "invalid parameter" */
211 return "unknown symbol in module or invalid parameter"
212 + sizeof("unknown symbol in module or");
214 return strerror(err);
218 static int load_module(const char *fname, const char *options)
222 size_t len = MAXINT(ssize_t);
224 dbg1_error_msg("load_module('%s','%s')", fname, options);
226 module_image = read_module(fname, &len);
227 r = (!module_image || init_module(module_image, len, options ? options : "") != 0);
229 dbg1_error_msg("load_module:%d", r);
230 return r; /* 0 = success */
233 dbg1_error_msg("load_module('%s','%s')", fname, options);
238 static char* parse_module(const char *pathname, const char *name)
244 dbg1_error_msg("parse_module('%s','%s')", pathname, name);
246 /* Read (possibly compressed) module */
247 len = 64 * 1024 * 1024; /* 64 Mb at most */
248 module_image = read_module(pathname, &len);
252 /* First desc line's format is
253 * "modname alias1 symbol:sym1 alias2 symbol:sym2 " (note trailing ' ')
260 ptr = find_keyword(module_image + pos, len - pos, "alias=");
262 ptr = find_keyword(module_image + pos, len - pos, "__ksymtab_");
265 /* DOCME: __ksymtab_gpl and __ksymtab_strings occur
266 * in many modules. What do they mean? */
267 if (strcmp(ptr, "gpl") != 0 && strcmp(ptr, "strings") != 0) {
268 dbg2_error_msg("alias: 'symbol:%s'", ptr);
272 dbg2_error_msg("alias: '%s'", ptr);
276 pos = (ptr - module_image);
280 /* Second line: "dependency1 depandency2 " (note trailing ' ') */
281 ptr = find_keyword(module_image, len, "depends=");
283 replace(ptr, ',', ' ');
284 replace(ptr, '-', '_');
285 dbg2_error_msg("dep:'%s'", ptr);
288 appendc(' '); appendc('\0');
291 return copy_stringbuf();
294 static char* pathname_2_modname(const char *pathname)
296 const char *fname = bb_get_last_path_component_nostrip(pathname);
297 const char *suffix = strrstr(fname, ".ko");
298 char *name = xstrndup(fname, suffix - fname);
299 replace(name, '-', '_');
303 static FAST_FUNC int fileAction(const char *pathname,
304 struct stat *sb ATTRIBUTE_UNUSED,
306 int depth ATTRIBUTE_UNUSED)
312 pathname += 2; /* skip "./" */
313 fname = bb_get_last_path_component_nostrip(pathname);
314 if (!strrstr(fname, ".ko")) {
315 dbg1_error_msg("'%s' is not a module", pathname);
316 return TRUE; /* not a module, continue search */
319 cur = module_count++;
320 if (!(cur & 0xfff)) {
321 modinfo = xrealloc(modinfo, sizeof(modinfo[0]) * (cur + 0x1001));
323 modinfo[cur].pathname = xstrdup(pathname);
324 modinfo[cur].desc = NULL;
325 modinfo[cur+1].pathname = NULL;
326 modinfo[cur+1].desc = NULL;
328 name = pathname_2_modname(fname);
329 if (strcmp(name, data) != 0) {
331 dbg1_error_msg("'%s' module name doesn't match", pathname);
332 return TRUE; /* module name doesn't match, continue search */
335 dbg1_error_msg("'%s' module name matches", pathname);
336 module_found_idx = cur;
337 modinfo[cur].desc = parse_module(pathname, name);
339 if (!(option_mask32 & OPT_r)) {
340 if (load_module(pathname, module_load_options) == 0) {
341 /* Load was successful, there is nothing else to do.
342 * This can happen ONLY for "top-level" module load,
343 * not a dep, because deps dont do dirscan. */
345 /*free(name);return RECURSE_RESULT_ABORT;*/
353 static module_info* find_alias(const char *alias)
356 dbg1_error_msg("find_alias('%s')", alias);
358 /* First try to find by name (cheaper) */
360 while (modinfo[i].pathname) {
361 char *name = pathname_2_modname(modinfo[i].pathname);
362 if (strcmp(name, alias) == 0) {
363 dbg1_error_msg("found '%s' in module '%s'",
364 alias, modinfo[i].pathname);
365 if (!modinfo[i].desc)
366 modinfo[i].desc = parse_module(modinfo[i].pathname, name);
374 /* Scan all module bodies, extract modinfo (it contains aliases) */
376 while (modinfo[i].pathname) {
378 if (!modinfo[i].desc) {
379 char *name = pathname_2_modname(modinfo[i].pathname);
380 modinfo[i].desc = parse_module(modinfo[i].pathname, name);
383 /* "modname alias1 symbol:sym1 alias2 symbol:sym2 " */
384 desc = xstrdup(modinfo[i].desc);
385 /* Does matching substring exist? */
386 replace(desc, ' ', '\0');
387 for (s = desc; *s; s += strlen(s) + 1) {
388 if (strcmp(s, alias) == 0) {
390 dbg1_error_msg("found alias '%s' in module '%s'",
391 alias, modinfo[i].pathname);
398 dbg1_error_msg("find_alias '%s' returns NULL", alias);
402 #if ENABLE_FEATURE_MODPROBE_SMALL_CHECK_ALREADY_LOADED
403 static int already_loaded(const char *name)
406 int len = strlen(name);
410 modules = xfopen("/proc/modules", "r");
411 while ((line = xmalloc_fgets(modules)) != NULL) {
412 if (strncmp(line, name, len) == 0 && line[len] == ' ') {
423 #define already_loaded(name) is_rmmod
427 Given modules definition and module name (or alias, or symbol)
428 load/remove the module respecting dependencies
430 #if !ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
431 #define process_module(a,b) process_module(a)
432 #define cmdline_options ""
434 static void process_module(char *name, const char *cmdline_options)
436 char *s, *deps, *options;
438 int is_rmmod = (option_mask32 & OPT_r) != 0;
439 dbg1_error_msg("process_module('%s','%s')", name, cmdline_options);
441 replace(name, '-', '_');
443 dbg1_error_msg("already_loaded:%d is_rmmod:%d", already_loaded(name), is_rmmod);
444 if (already_loaded(name) != is_rmmod) {
445 dbg1_error_msg("nothing to do for '%s'", name);
451 char *opt_filename = xasprintf("/etc/modules/%s", name);
452 options = xmalloc_open_read_close(opt_filename, NULL);
454 replace(options, '\n', ' ');
455 #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
456 if (cmdline_options) {
457 /* NB: cmdline_options always have one leading ' '
458 * (see main()), we remove it here */
459 char *op = xasprintf(options ? "%s %s" : "%s %s" + 3,
460 cmdline_options + 1, options);
466 module_load_options = options;
467 dbg1_error_msg("process_module('%s'): options:'%s'", name, options);
471 /* Scan module directory. This is done only once.
472 * It will attempt module load, and will exit(EXIT_SUCCESS)
474 module_found_idx = -1;
475 recursive_action(".",
476 ACTION_RECURSE, /* flags */
477 fileAction, /* file action */
478 NULL, /* dir action */
479 name, /* user data */
481 dbg1_error_msg("dirscan complete");
482 /* Module was not found, or load failed, or is_rmmod */
483 if (module_found_idx >= 0) { /* module was found */
484 info = &modinfo[module_found_idx];
485 } else { /* search for alias, not a plain module name */
486 info = find_alias(name);
489 info = find_alias(name);
492 /* rmmod? unload it by name */
494 if (delete_module(name, O_NONBLOCK|O_EXCL) != 0
495 && !(option_mask32 & OPT_q)
497 bb_perror_msg("remove '%s'", name);
500 /* N.B. we do not stop here -
501 * continue to unload modules on which the module depends:
502 * "-r --remove: option causes modprobe to remove a module.
503 * If the modules it depends on are also unused, modprobe
504 * will try to remove them, too." */
507 if (!info) { /* both dirscan and find_alias found nothing */
511 /* Second line of desc contains dependencies */
512 deps = xstrdup(info->desc + strlen(info->desc) + 1);
514 /* Transform deps to string list */
515 replace(deps, ' ', '\0');
516 /* Iterate thru dependencies, trying to (un)load them */
517 for (s = deps; *s; s += strlen(s) + 1) {
518 //if (strcmp(name, s) != 0) // N.B. do loops exist?
519 dbg1_error_msg("recurse on dep '%s'", s);
520 process_module(s, NULL);
521 dbg1_error_msg("recurse on dep '%s' done", s);
525 /* insmod -> load it */
528 if (load_module(info->pathname, options) != 0) {
529 if (EEXIST != errno) {
530 bb_error_msg("insert '%s' %s: %s",
531 info->pathname, options,
534 dbg1_error_msg("insert '%s' %s: %s",
535 info->pathname, options,
542 //TODO: return load attempt result from process_module.
543 //If dep didn't load ok, continuing makes little sense.
545 #undef cmdline_options
548 /* For reference, module-init-tools-0.9.15-pre2 options:
551 Usage: insmod filename [args]
554 Usage: rmmod [-fhswvV] modulename ...
555 -f (or --force) forces a module unload, and may crash your machine.
556 -s (or --syslog) says use syslog, not stderr
557 -v (or --verbose) enables more messages
558 -w (or --wait) begins a module removal even if it is used
559 and will stop new users from accessing the module (so it
560 should eventually fall to zero).
563 Usage: modprobe [--verbose|--version|--config|--remove] filename [options]
566 depmod 0.9.15-pre2 -- part of module-init-tools
567 depmod -[aA] [-n -e -v -q -V -r -u] [-b basedirectory] [forced_version]
568 depmod [-n -e -v -q -r -u] [-F kernelsyms] module1.o module2.o ...
569 If no arguments (except options) are given, "depmod -a" is assumed
571 depmod will output a dependancy list suitable for the modprobe utility.
574 -a, --all Probe all modules
575 -n, --show Write the dependency file on stdout only
577 --basedir basedirectory Use an image of a module tree.
579 --filesyms kernelsyms Use the file instead of the
580 current kernel symbols.
583 int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
584 int modprobe_main(int ATTRIBUTE_UNUSED argc, char **argv)
587 char applet0 = applet_name[0];
588 USE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(char *options;)
590 /* depmod is a stub */
594 /* are we lsmod? -> just dump /proc/modules */
595 if ('l' == applet0) {
596 xprint_and_close_file(xfopen("/proc/modules", "r"));
602 /* insmod, modprobe, rmmod require at least one argument */
603 opt_complementary = "-1";
604 /* only -q (quiet) and -r (rmmod),
605 * the rest are accepted and ignored (compat) */
606 getopt32(argv, "qrfsvw");
609 /* are we rmmod? -> simulate modprobe -r */
610 if ('r' == applet0) {
611 option_mask32 |= OPT_r;
614 /* goto modules directory */
615 xchdir(CONFIG_DEFAULT_MODULES_DIR);
616 uname(&uts); /* never fails */
619 #if ENABLE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE
620 /* If not rmmod, parse possible module options given on command line.
621 * insmod/modprobe takes one module name, the rest are parameters. */
623 if ('r' != applet0) {
626 /* Enclose options in quotes */
628 options = xasprintf("%s \"%s\"", s ? s : "", *arg);
638 /* Load/remove modules.
639 * Only rmmod loops here, insmod/modprobe has only argv[0] */
641 process_module(*argv++, options);
644 if (ENABLE_FEATURE_CLEAN_UP) {
645 USE_FEATURE_MODPROBE_SMALL_OPTIONS_ON_CMDLINE(free(options);)