modutils/modprobe.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Modprobe written from scratch for BusyBox
   4  *
   5  * Copyright (c) 2008 Timo Teras <timo.teras@iki.fi>
   6  * Copyright (c) 2008 Vladimir Dronnikov
   7  *
   8  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9  */
  10 //config:config MODPROBE
  11 //config:       bool "modprobe (27 kb)"
  12 //config:       default y
  13 //config:       help
  14 //config:       Handle the loading of modules, and their dependencies on a high
  15 //config:       level.
  16 //config:
  17 //config:config FEATURE_MODPROBE_BLACKLIST
  18 //config:       bool "Blacklist support"
  19 //config:       default y
  20 //config:       depends on MODPROBE && !MODPROBE_SMALL
  21 //config:       help
  22 //config:       Say 'y' here to enable support for the 'blacklist' command in
  23 //config:       modprobe.conf. This prevents the alias resolver to resolve
  24 //config:       blacklisted modules. This is useful if you want to prevent your
  25 //config:       hardware autodetection scripts to load modules like evdev, frame
  26 //config:       buffer drivers etc.
  27
  28 //applet:IF_MODPROBE(IF_NOT_MODPROBE_SMALL(APPLET_NOEXEC(modprobe, modprobe, BB_DIR_SBIN, BB_SUID_DROP, modprobe)))
  29
  30 //kbuild:ifneq ($(CONFIG_MODPROBE_SMALL),y)
  31 //kbuild:lib-$(CONFIG_MODPROBE) += modprobe.o modutils.o
  32 //kbuild:endif
  33
  34 #include "libbb.h"
  35 #include "modutils.h"
  36 #include <sys/utsname.h>
  37 #include <fnmatch.h>
  38
  39 #if 1
  40 #define DBG(...) ((void)0)
  41 #else
  42 #define DBG(fmt, ...) bb_error_msg("%s: " fmt, __func__, ## __VA_ARGS__)
  43 #endif
  44
  45 /* Note that unlike older versions of modules.dep/depmod (busybox and m-i-t),
  46  * we expect the full dependency list to be specified in modules.dep.
  47  * Older versions would only export the direct dependency list.
  48  */
  49
  50
  51 //usage:#if !ENABLE_MODPROBE_SMALL
  52 //usage:#define modprobe_notes_usage
  53 //usage:        "modprobe can (un)load a stack of modules, passing each module options (when\n"
  54 //usage:        "loading). modprobe uses a configuration file to determine what option(s) to\n"
  55 //usage:        "pass each module it loads.\n"
  56 //usage:        "\n"
  57 //usage:        "The configuration file is searched (in this order):\n"
  58 //usage:        "\n"
  59 //usage:        "    /etc/modprobe.conf (2.6 only)\n"
  60 //usage:        "    /etc/modules.conf\n"
  61 //usage:        "    /etc/conf.modules (deprecated)\n"
  62 //usage:        "\n"
  63 //usage:        "They all have the same syntax (see below). If none is present, it is\n"
  64 //usage:        "_not_ an error; each loaded module is then expected to load without\n"
  65 //usage:        "options. Once a file is found, the others are tested for.\n"
  66 //usage:        "\n"
  67 //usage:        "/etc/modules.conf entry format:\n"
  68 //usage:        "\n"
  69 //usage:        "  alias <alias_name> <mod_name>\n"
  70 //usage:        "    Makes it possible to modprobe alias_name, when there is no such module.\n"
  71 //usage:        "    It makes sense if your mod_name is long, or you want a more representative\n"
  72 //usage:        "    name for that module (eg. 'scsi' in place of 'aha7xxx').\n"
  73 //usage:        "    This makes it also possible to use a different set of options (below) for\n"
  74 //usage:        "    the module and the alias.\n"
  75 //usage:        "    A module can be aliased more than once.\n"
  76 //usage:        "\n"
  77 //usage:        "  options <mod_name|alias_name> <symbol=value...>\n"
  78 //usage:        "    When loading module mod_name (or the module aliased by alias_name), pass\n"
  79 //usage:        "    the \"symbol=value\" pairs as option to that module.\n"
  80 //usage:        "\n"
  81 //usage:        "Sample /etc/modules.conf file:\n"
  82 //usage:        "\n"
  83 //usage:        "  options tulip irq=3\n"
  84 //usage:        "  alias tulip tulip2\n"
  85 //usage:        "  options tulip2 irq=4 io=0x308\n"
  86 //usage:        "\n"
  87 //usage:        "Other functionality offered by 'classic' modprobe is not available in\n"
  88 //usage:        "this implementation.\n"
  89 //usage:        "\n"
  90 //usage:        "If module options are present both in the config file, and on the command line,\n"
  91 //usage:        "then the options from the command line will be passed to the module _after_\n"
  92 //usage:        "the options from the config file. That way, you can have defaults in the config\n"
  93 //usage:        "file, and override them for a specific usage from the command line.\n"
  94 //usage:#define modprobe_example_usage
  95 //usage:       "(with the above /etc/modules.conf):\n\n"
  96 //usage:       "$ modprobe tulip\n"
  97 //usage:       "   will load the module 'tulip' with default option 'irq=3'\n\n"
  98 //usage:       "$ modprobe tulip irq=5\n"
  99 //usage:       "   will load the module 'tulip' with option 'irq=5', thus overriding the default\n\n"
 100 //usage:       "$ modprobe tulip2\n"
 101 //usage:       "   will load the module 'tulip' with default options 'irq=4 io=0x308',\n"
 102 //usage:       "   which are the default for alias 'tulip2'\n\n"
 103 //usage:       "$ modprobe tulip2 irq=8\n"
 104 //usage:       "   will load the module 'tulip' with default options 'irq=4 io=0x308 irq=8',\n"
 105 //usage:       "   which are the default for alias 'tulip2' overridden by the option 'irq=8'\n\n"
 106 //usage:       "   from the command line\n\n"
 107 //usage:       "$ modprobe tulip2 irq=2 io=0x210\n"
 108 //usage:       "   will load the module 'tulip' with default options 'irq=4 io=0x308 irq=4 io=0x210',\n"
 109 //usage:       "   which are the default for alias 'tulip2' overridden by the options 'irq=2 io=0x210'\n\n"
 110 //usage:       "   from the command line\n"
 111 //usage:
 112 //usage:#define modprobe_trivial_usage
 113 //usage:        "[-alrqvsD" IF_FEATURE_MODPROBE_BLACKLIST("b") "]"
 114 //usage:        " MODULE" IF_FEATURE_CMDLINE_MODULE_OPTIONS(" [SYMBOL=VALUE]...")
 115 //usage:#define modprobe_full_usage "\n\n"
 116 //usage:       "        -a      Load multiple MODULEs"
 117 //usage:     "\n        -l      List (MODULE is a pattern)"
 118 //usage:     "\n        -r      Remove MODULE (stacks) or do autoclean"
 119 //usage:     "\n        -q      Quiet"
 120 //usage:     "\n        -v      Verbose"
 121 //usage:     "\n        -s      Log to syslog"
 122 //usage:     "\n        -D      Show dependencies"
 123 //usage:        IF_FEATURE_MODPROBE_BLACKLIST(
 124 //usage:     "\n        -b      Apply blacklist to module names too"
 125 //usage:        )
 126 //usage:#endif /* !ENABLE_MODPROBE_SMALL */
 127
 128 /* Note: usage text doesn't document various 2.4 options
 129  * we pull in through INSMOD_OPTS define
 130  * Note2: -b is always accepted, but if !FEATURE_MODPROBE_BLACKLIST,
 131  * it is a no-op.
 132  */
 133 #define MODPROBE_OPTS  "alrDb"
 134 /* -a and -D _are_ in fact compatible */
 135 #define MODPROBE_COMPLEMENTARY "q-v:v-q:l--arD:r--alD:a--lr:D--rl"
 136 //#define MODPROBE_OPTS  "acd:lnrt:C:b"
 137 //#define MODPROBE_COMPLEMENTARY "q-v:v-q:l--acr:a--lr:r--al"
 138 enum {
 139         OPT_INSERT_ALL   = (INSMOD_OPT_UNUSED << 0), /* a */
 140         //OPT_DUMP_ONLY  = (INSMOD_OPT_UNUSED << x), /* c */
 141         //OPT_DIRNAME    = (INSMOD_OPT_UNUSED << x), /* d */
 142         OPT_LIST_ONLY    = (INSMOD_OPT_UNUSED << 1), /* l */
 143         //OPT_SHOW_ONLY  = (INSMOD_OPT_UNUSED << x), /* n */
 144         OPT_REMOVE       = (INSMOD_OPT_UNUSED << 2), /* r */
 145         //OPT_RESTRICT   = (INSMOD_OPT_UNUSED << x), /* t */
 146         //OPT_VERONLY    = (INSMOD_OPT_UNUSED << x), /* V */
 147         //OPT_CONFIGFILE = (INSMOD_OPT_UNUSED << x), /* C */
 148         OPT_SHOW_DEPS    = (INSMOD_OPT_UNUSED << 3), /* D */
 149         OPT_BLACKLIST    = (INSMOD_OPT_UNUSED << 4) * ENABLE_FEATURE_MODPROBE_BLACKLIST,
 150 };
 151 #if ENABLE_LONG_OPTS
 152 static const char modprobe_longopts[] ALIGN1 =
 153         /* nobody asked for long opts (yet) */
 154         // "all\0"          No_argument "a"
 155         // "list\0"         No_argument "l"
 156         // "remove\0"       No_argument "r"
 157         // "quiet\0"        No_argument "q"
 158         // "verbose\0"      No_argument "v"
 159         // "syslog\0"       No_argument "s"
 160         /* module-init-tools 3.11.1 has only long opt --show-depends
 161          * but no short -D, we provide long opt for scripts which
 162          * were written for 3.11.1: */
 163         "show-depends\0"     No_argument "D"
 164         // "use-blacklist\0" No_argument "b"
 165         ;
 166 #endif
 167
 168 #define MODULE_FLAG_LOADED              0x0001
 169 #define MODULE_FLAG_NEED_DEPS           0x0002
 170 /* "was seen in modules.dep": */
 171 #define MODULE_FLAG_FOUND_IN_MODDEP     0x0004
 172 #define MODULE_FLAG_BLACKLISTED         0x0008
 173 #define MODULE_FLAG_BUILTIN             0x0010
 174
 175 struct globals {
 176         llist_t *probes; /* MEs of module(s) requested on cmdline */
 177 #if ENABLE_FEATURE_CMDLINE_MODULE_OPTIONS
 178         char *cmdline_mopts; /* module options from cmdline */
 179 #endif
 180         int num_unresolved_deps;
 181         /* bool. "Did we have 'symbol:FOO' requested on cmdline?" */
 182         smallint need_symbols;
 183         struct utsname uts;
 184         module_db db;
 185 } FIX_ALIASING;
 186 #define G (*ptr_to_globals)
 187 #define INIT_G() do { \
 188         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 189 } while (0)
 190
 191
 192 static int read_config(const char *path);
 193
 194 static char *gather_options_str(char *opts, const char *append)
 195 {
 196         /* Speed-optimized. We call gather_options_str many times. */
 197         if (append) {
 198                 if (opts == NULL) {
 199                         opts = xstrdup(append);
 200                 } else {
 201                         int optlen = strlen(opts);
 202                         opts = xrealloc(opts, optlen + strlen(append) + 2);
 203                         sprintf(opts + optlen, " %s", append);
 204                 }
 205         }
 206         return opts;
 207 }
 208
 209 static struct module_entry *get_or_add_modentry(const char *module)
 210 {
 211         return moddb_get_or_create(&G.db, module);
 212 }
 213
 214 static void add_probe(const char *name)
 215 {
 216         struct module_entry *m;
 217
 218         m = get_or_add_modentry(name);
 219         if (!(option_mask32 & (OPT_REMOVE | OPT_SHOW_DEPS))
 220          && (m->flags & (MODULE_FLAG_LOADED | MODULE_FLAG_BUILTIN))
 221         ) {
 222                 DBG("skipping %s, it is already loaded", name);
 223                 return;
 224         }
 225
 226         DBG("queuing %s", name);
 227         m->probed_name = name;
 228         m->flags |= MODULE_FLAG_NEED_DEPS;
 229         llist_add_to_end(&G.probes, m);
 230         G.num_unresolved_deps++;
 231         if (ENABLE_FEATURE_MODUTILS_SYMBOLS
 232          && is_prefixed_with(m->modname, "symbol:")
 233         ) {
 234                 G.need_symbols = 1;
 235         }
 236 }
 237
 238 static int FAST_FUNC config_file_action(struct recursive_state *state,
 239                 const char *filename,
 240                 struct stat *statbuf UNUSED_PARAM)
 241 {
 242         char *tokens[3];
 243         parser_t *p;
 244         struct module_entry *m;
 245         int rc = TRUE;
 246         const char *base;
 247
 248         /* Skip files that begin with a "." */
 249         base = bb_basename(filename);
 250         if (base[0] == '.')
 251                 goto error;
 252
 253         /* "man modprobe.d" from kmod version 22 suggests
 254          * that we shouldn't recurse into /etc/modprobe.d/dir/
 255          * _subdirectories_:
 256          */
 257         if (state->depth > 1)
 258                 return SKIP; /* stop recursing */
 259 //TODO: instead, can use dirAction in recursive_action() to SKIP dirs
 260 //on depth == 1 level. But that's more code...
 261
 262         /* In dir recursion, skip files that do not end with a ".conf"
 263          * depth==0: read_config("modules.{symbols,alias}") must work,
 264          * "include FILE_NOT_ENDING_IN_CONF" must work too.
 265          */
 266         if (state->depth != 0) {
 267                 if (!is_suffixed_with(base, ".conf"))
 268                         goto error;
 269         }
 270
 271         p = config_open2(filename, fopen_for_read);
 272         if (p == NULL) {
 273                 rc = FALSE;
 274                 goto error;
 275         }
 276
 277         while (config_read(p, tokens, 3, 2, "# \t", PARSE_NORMAL)) {
 278 //Use index_in_strings?
 279                 if (strcmp(tokens[0], "alias") == 0) {
 280                         /* alias <wildcard> <modulename> */
 281                         llist_t *l;
 282                         char wildcard[MODULE_NAME_LEN];
 283                         char *rmod;
 284
 285                         if (tokens[2] == NULL)
 286                                 continue;
 287                         filename2modname(tokens[1], wildcard);
 288
 289                         for (l = G.probes; l; l = l->link) {
 290                                 m = (struct module_entry *) l->data;
 291                                 if (fnmatch(wildcard, m->modname, 0) != 0)
 292                                         continue;
 293                                 rmod = filename2modname(tokens[2], NULL);
 294                                 llist_add_to(&m->realnames, rmod);
 295
 296                                 if (m->flags & MODULE_FLAG_NEED_DEPS) {
 297                                         m->flags &= ~MODULE_FLAG_NEED_DEPS;
 298                                         G.num_unresolved_deps--;
 299                                 }
 300
 301                                 m = get_or_add_modentry(rmod);
 302                                 if (!(m->flags & MODULE_FLAG_NEED_DEPS)) {
 303                                         m->flags |= MODULE_FLAG_NEED_DEPS;
 304                                         G.num_unresolved_deps++;
 305                                 }
 306                         }
 307                 } else if (strcmp(tokens[0], "options") == 0) {
 308                         /* options <modulename> <option...> */
 309                         if (tokens[2] == NULL)
 310                                 continue;
 311                         m = get_or_add_modentry(tokens[1]);
 312                         m->options = gather_options_str(m->options, tokens[2]);
 313                 } else if (strcmp(tokens[0], "include") == 0) {
 314                         /* include <filename>/<dirname> (yes, directories also must work) */
 315                         read_config(tokens[1]);
 316                 } else if (ENABLE_FEATURE_MODPROBE_BLACKLIST
 317                  && strcmp(tokens[0], "blacklist") == 0
 318                 ) {
 319                         /* blacklist <modulename> */
 320                         get_or_add_modentry(tokens[1])->flags |= MODULE_FLAG_BLACKLISTED;
 321                 }
 322         }
 323         config_close(p);
 324  error:
 325         return rc;
 326 }
 327
 328 static int read_config(const char *path)
 329 {
 330         return recursive_action(path, ACTION_RECURSE | ACTION_QUIET,
 331                                 config_file_action, NULL, NULL);
 332 }
 333
 334 static const char *humanly_readable_name(struct module_entry *m)
 335 {
 336         /* probed_name may be NULL. modname always exists. */
 337         return m->probed_name ? m->probed_name : m->modname;
 338 }
 339
 340 /* Like strsep(&stringp, "\n\t ") but quoted text goes to single token
 341  * even if it contains whitespace.
 342  */
 343 static char *strsep_quotes(char **stringp)
 344 {
 345         char *s, *start = *stringp;
 346
 347         if (!start)
 348                 return NULL;
 349
 350         for (s = start; ; s++) {
 351                 switch (*s) {
 352                 case '"':
 353                         s = strchrnul(s + 1, '"'); /* find trailing quote */
 354                         if (*s != '\0')
 355                                 s++; /* skip trailing quote */
 356                         /* fall through */
 357                 case '\0':
 358                 case '\n':
 359                 case '\t':
 360                 case ' ':
 361                         if (*s != '\0') {
 362                                 *s = '\0';
 363                                 *stringp = s + 1;
 364                         } else {
 365                                 *stringp = NULL;
 366                         }
 367                         return start;
 368                 }
 369         }
 370 }
 371
 372 static char *parse_and_add_kcmdline_module_options(char *options, const char *modulename)
 373 {
 374         char *kcmdline_buf;
 375         char *kcmdline;
 376         char *kptr;
 377
 378         kcmdline_buf = xmalloc_open_read_close("/proc/cmdline", NULL);
 379         if (!kcmdline_buf)
 380                 return options;
 381
 382         kcmdline = kcmdline_buf;
 383         while ((kptr = strsep_quotes(&kcmdline)) != NULL) {
 384                 char *after_modulename = is_prefixed_with(kptr, modulename);
 385                 if (!after_modulename || *after_modulename != '.')
 386                         continue;
 387                 /* It is "modulename.xxxx" */
 388                 kptr = after_modulename + 1;
 389                 if (strchr(kptr, '=') != NULL) {
 390                         /* It is "modulename.opt=[val]" */
 391                         options = gather_options_str(options, kptr);
 392                 }
 393         }
 394         free(kcmdline_buf);
 395
 396         return options;
 397 }
 398
 399 /* Return: similar to bb_init_module:
 400  * 0 on success,
 401  * -errno on open/read error,
 402  * errno on init_module() error
 403  */
 404 /* NB: INSMOD_OPT_SILENT bit suppresses ONLY non-existent modules,
 405  * not deleted ones (those are still listed in modules.dep).
 406  * module-init-tools version 3.4:
 407  * # modprobe bogus
 408  * FATAL: Module bogus not found. [exitcode 1]
 409  * # modprobe -q bogus            [silent, exitcode still 1]
 410  * but:
 411  * # rm kernel/drivers/net/dummy.ko
 412  * # modprobe -q dummy
 413  * FATAL: Could not open '/lib/modules/xxx/kernel/drivers/net/dummy.ko': No such file or directory
 414  * [exitcode 1]
 415  */
 416 static int do_modprobe(struct module_entry *m)
 417 {
 418         int rc, first;
 419
 420         if (!(m->flags & MODULE_FLAG_FOUND_IN_MODDEP)) {
 421                 if (!(option_mask32 & INSMOD_OPT_SILENT))
 422                         bb_error_msg((m->flags & MODULE_FLAG_BUILTIN) ?
 423                                      "module %s is builtin" :
 424                                      "module %s not found in modules.dep",
 425                                      humanly_readable_name(m));
 426                 return -ENOENT;
 427         }
 428         DBG("do_modprob'ing %s", m->modname);
 429
 430         if (!(option_mask32 & OPT_REMOVE))
 431                 m->deps = llist_rev(m->deps);
 432
 433         if (0) {
 434                 llist_t *l;
 435                 for (l = m->deps; l; l = l->link)
 436                         DBG("dep: %s", l->data);
 437         }
 438
 439         first = 1;
 440         rc = 0;
 441         while (m->deps) {
 442                 struct module_entry *m2;
 443                 char *fn, *options;
 444
 445                 rc = 0;
 446                 fn = llist_pop(&m->deps); /* we leak it */
 447                 m2 = get_or_add_modentry(bb_get_last_path_component_nostrip(fn));
 448
 449                 if (option_mask32 & OPT_REMOVE) {
 450                         /* modprobe -r */
 451                         if (m2->flags & MODULE_FLAG_LOADED) {
 452                                 rc = bb_delete_module(m2->modname, O_EXCL);
 453                                 if (rc) {
 454                                         if (first) {
 455                                                 bb_perror_msg("can't unload module '%s'",
 456                                                         humanly_readable_name(m2));
 457                                                 break;
 458                                         }
 459                                 } else {
 460                                         m2->flags &= ~MODULE_FLAG_LOADED;
 461                                 }
 462                         }
 463                         /* do not error out if *deps* fail to unload */
 464                         first = 0;
 465                         continue;
 466                 }
 467
 468                 options = m2->options;
 469                 m2->options = NULL;
 470                 options = parse_and_add_kcmdline_module_options(options, m2->modname);
 471 #if ENABLE_FEATURE_CMDLINE_MODULE_OPTIONS
 472                 if (m == m2)
 473                         options = gather_options_str(options, G.cmdline_mopts);
 474 #endif
 475
 476                 if (option_mask32 & OPT_SHOW_DEPS) {
 477                         printf(options ? "insmod %s/%s/%s %s\n"
 478                                         : "insmod %s/%s/%s\n",
 479                                 CONFIG_DEFAULT_MODULES_DIR, G.uts.release, fn,
 480                                 options);
 481                         free(options);
 482                         continue;
 483                 }
 484
 485                 if (m2->flags & MODULE_FLAG_LOADED) {
 486                         DBG("%s is already loaded, skipping", fn);
 487                         free(options);
 488                         continue;
 489                 }
 490
 491                 rc = bb_init_module(fn, options);
 492                 DBG("loaded %s '%s', rc:%d", fn, options, rc);
 493                 if (rc == EEXIST)
 494                         rc = 0;
 495                 free(options);
 496                 if (rc) {
 497                         bb_error_msg("can't load module %s (%s): %s",
 498                                 humanly_readable_name(m2),
 499                                 fn,
 500                                 moderror(rc)
 501                         );
 502                         break;
 503                 }
 504                 m2->flags |= MODULE_FLAG_LOADED;
 505         }
 506
 507         return rc;
 508 }
 509
 510 static void load_modules_dep(void)
 511 {
 512         struct module_entry *m;
 513         char *colon, *tokens[2];
 514         parser_t *p;
 515
 516         /* Modprobe does not work at all without modules.dep,
 517          * even if the full module name is given. Returning error here
 518          * was making us later confuse user with this message:
 519          * "module /full/path/to/existing/file/module.ko not found".
 520          * It's better to die immediately, with good message.
 521          * xfopen_for_read provides that. */
 522         p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read);
 523
 524         while (G.num_unresolved_deps
 525          && config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)
 526         ) {
 527                 colon = last_char_is(tokens[0], ':');
 528                 if (colon == NULL)
 529                         continue;
 530                 *colon = '\0';
 531
 532                 m = moddb_get(&G.db, bb_get_last_path_component_nostrip(tokens[0]));
 533                 if (m == NULL)
 534                         continue;
 535
 536                 /* Optimization... */
 537                 if ((m->flags & MODULE_FLAG_LOADED)
 538                  && !(option_mask32 & (OPT_REMOVE | OPT_SHOW_DEPS))
 539                 ) {
 540                         DBG("skip deps of %s, it's already loaded", tokens[0]);
 541                         continue;
 542                 }
 543
 544                 m->flags |= MODULE_FLAG_FOUND_IN_MODDEP;
 545                 if ((m->flags & MODULE_FLAG_NEED_DEPS) && (m->deps == NULL)) {
 546                         G.num_unresolved_deps--;
 547                         llist_add_to(&m->deps, xstrdup(tokens[0]));
 548                         if (tokens[1])
 549                                 string_to_llist(tokens[1], &m->deps, " \t");
 550                 } else
 551                         DBG("skipping dep line");
 552         }
 553         config_close(p);
 554 }
 555
 556 int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 557 int modprobe_main(int argc UNUSED_PARAM, char **argv)
 558 {
 559         int rc;
 560         unsigned opt;
 561         struct module_entry *me;
 562
 563         INIT_G();
 564
 565         opt = getopt32long(argv, "^" INSMOD_OPTS MODPROBE_OPTS "\0" MODPROBE_COMPLEMENTARY,
 566                         modprobe_longopts
 567                         INSMOD_ARGS
 568         );
 569         argv += optind;
 570
 571         /* Goto modules location */
 572         xchdir(CONFIG_DEFAULT_MODULES_DIR);
 573         uname(&G.uts);
 574         xchdir(G.uts.release);
 575
 576         if (opt & OPT_LIST_ONLY) {
 577                 int i;
 578                 char *colon, *tokens[2];
 579                 parser_t *p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read);
 580
 581                 for (i = 0; argv[i]; i++)
 582                         replace(argv[i], '-', '_');
 583
 584                 while (config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
 585                         colon = last_char_is(tokens[0], ':');
 586                         if (!colon)
 587                                 continue;
 588                         *colon = '\0';
 589                         if (!argv[0])
 590                                 puts(tokens[0]);
 591                         else {
 592                                 char name[MODULE_NAME_LEN];
 593                                 filename2modname(
 594                                         bb_get_last_path_component_nostrip(tokens[0]),
 595                                         name
 596                                 );
 597                                 for (i = 0; argv[i]; i++) {
 598                                         if (fnmatch(argv[i], name, 0) == 0) {
 599                                                 puts(tokens[0]);
 600                                         }
 601                                 }
 602                         }
 603                 }
 604                 return EXIT_SUCCESS;
 605         }
 606
 607         /* Yes, for some reason -l ignores -s... */
 608         if (opt & INSMOD_OPT_SYSLOG)
 609                 logmode = LOGMODE_SYSLOG;
 610
 611         if (!argv[0]) {
 612                 if (opt & OPT_REMOVE) {
 613                         /* "modprobe -r" (w/o params).
 614                          * "If name is NULL, all unused modules marked
 615                          * autoclean will be removed".
 616                          */
 617                         if (bb_delete_module(NULL, O_NONBLOCK | O_EXCL) != 0)
 618                                 bb_perror_nomsg_and_die();
 619                 }
 620                 return EXIT_SUCCESS;
 621         }
 622
 623         /* Retrieve module names of already loaded modules */
 624         {
 625                 char *s;
 626                 parser_t *parser = config_open2("/proc/modules", fopen_for_read);
 627                 while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY))
 628                         get_or_add_modentry(s)->flags |= MODULE_FLAG_LOADED;
 629                 config_close(parser);
 630
 631                 parser = config_open2("modules.builtin", fopen_for_read);
 632                 /* this file contains lines like "kernel/fs/binfmt_script.ko" */
 633                 while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL))
 634                         get_or_add_modentry(bb_basename(s))->flags |= MODULE_FLAG_BUILTIN;
 635                 config_close(parser);
 636         }
 637
 638         if (opt & (OPT_INSERT_ALL | OPT_REMOVE)) {
 639                 /* Each argument is a module name */
 640                 do {
 641                         DBG("adding module %s", *argv);
 642                         add_probe(*argv++);
 643                 } while (*argv);
 644         } else {
 645                 /* First argument is module name, rest are parameters */
 646                 DBG("probing just module %s", *argv);
 647                 add_probe(argv[0]);
 648 #if ENABLE_FEATURE_CMDLINE_MODULE_OPTIONS
 649                 G.cmdline_mopts = parse_cmdline_module_options(argv, /*quote_spaces:*/ 1);
 650 #endif
 651         }
 652
 653         /* Happens if all requested modules are already loaded */
 654         if (G.probes == NULL)
 655                 return EXIT_SUCCESS;
 656
 657         read_config("/etc/modprobe.conf");
 658         read_config("/etc/modprobe.d");
 659         if (ENABLE_FEATURE_MODUTILS_SYMBOLS && G.need_symbols)
 660                 read_config("modules.symbols");
 661         load_modules_dep();
 662         if (ENABLE_FEATURE_MODUTILS_ALIAS && G.num_unresolved_deps) {
 663                 read_config("modules.alias");
 664                 load_modules_dep();
 665         }
 666
 667         /* Handle modprobe.blacklist=module1,module2,... */
 668         if (ENABLE_FEATURE_MODPROBE_BLACKLIST) {
 669                 char *options;
 670                 char *substr;
 671
 672                 options = parse_and_add_kcmdline_module_options(NULL, "modprobe");
 673                 while ((substr = strsep(&options, " ")) != NULL) {
 674                         char *fn = is_prefixed_with(substr, "blacklist=");
 675                         if (!fn)
 676                                 continue;
 677                         while ((substr = strsep(&fn, ",")) != NULL) {
 678                                 /* blacklist <modulename> */
 679                                 get_or_add_modentry(substr)->flags |= MODULE_FLAG_BLACKLISTED;
 680                                 DBG("blacklist: %s", substr);
 681                         }
 682                 }
 683                 /*free(options); - WRONG, strsep may have advanced it */
 684         }
 685
 686         rc = 0;
 687         while ((me = llist_pop(&G.probes)) != NULL) {
 688                 if (me->realnames == NULL) {
 689                         DBG("probing by module name");
 690                         /* This is not an alias. Literal names are blacklisted
 691                          * only if '-b' is given.
 692                          */
 693                         if (!(opt & OPT_BLACKLIST)
 694                          || !(me->flags & MODULE_FLAG_BLACKLISTED)
 695                         ) {
 696                                 rc |= do_modprobe(me);
 697                         }
 698                         continue;
 699                 }
 700
 701                 /* Probe all real names for the alias */
 702                 do {
 703                         char *realname = llist_pop(&me->realnames);
 704                         struct module_entry *m2;
 705
 706                         DBG("probing alias %s by realname %s", me->modname, realname);
 707                         m2 = get_or_add_modentry(realname);
 708                         if (!(m2->flags & MODULE_FLAG_BLACKLISTED)
 709                          && (!(m2->flags & MODULE_FLAG_LOADED)
 710                             || (opt & (OPT_REMOVE | OPT_SHOW_DEPS)))
 711                         ) {
 712 //TODO: we can pass "me" as 2nd param to do_modprobe,
 713 //and make do_modprobe emit more meaningful error messages
 714 //with alias name included, not just module name alias resolves to.
 715                                 rc |= do_modprobe(m2);
 716                         }
 717                         free(realname);
 718                 } while (me->realnames != NULL);
 719         }
 720
 721         if (ENABLE_FEATURE_CLEAN_UP)
 722                 moddb_free(&G.db);
 723
 724         return (rc != 0);
 725 }