tools/modprobe.c

   1 /*
   2  * kmod-modprobe - manage linux kernel modules using libkmod.
   3  *
   4  * Copyright (C) 2011-2013  ProFUSION embedded systems
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <getopt.h>
  23 #include <limits.h>
  24 #include <stdbool.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <unistd.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/utsname.h>
  32 #include <sys/wait.h>
  33
  34 #include <shared/array.h>
  35 #include <shared/macro.h>
  36
  37 #include <libkmod/libkmod.h>
  38
  39 #include "kmod.h"
  40
  41 static int log_priority = LOG_CRIT;
  42 static int use_syslog = 0;
  43 #define LOG(...) log_printf(log_priority, __VA_ARGS__)
  44
  45 #define DEFAULT_VERBOSE LOG_WARNING
  46 static int verbose = DEFAULT_VERBOSE;
  47 static int do_show = 0;
  48 static int dry_run = 0;
  49 static int ignore_loaded = 0;
  50 static int lookup_only = 0;
  51 static int first_time = 0;
  52 static int ignore_commands = 0;
  53 static int use_blacklist = 0;
  54 static int force = 0;
  55 static int strip_modversion = 0;
  56 static int strip_vermagic = 0;
  57 static int remove_dependencies = 0;
  58 static int quiet_inuse = 0;
  59
  60 static const char cmdopts_s[] = "arRibfDcnC:d:S:sqvVh";
  61 static const struct option cmdopts[] = {
  62         {"all", no_argument, 0, 'a'},
  63         {"remove", no_argument, 0, 'r'},
  64         {"remove-dependencies", no_argument, 0, 5},
  65         {"resolve-alias", no_argument, 0, 'R'},
  66         {"first-time", no_argument, 0, 3},
  67         {"ignore-install", no_argument, 0, 'i'},
  68         {"ignore-remove", no_argument, 0, 'i'},
  69         {"use-blacklist", no_argument, 0, 'b'},
  70         {"force", no_argument, 0, 'f'},
  71         {"force-modversion", no_argument, 0, 2},
  72         {"force-vermagic", no_argument, 0, 1},
  73
  74         {"show-depends", no_argument, 0, 'D'},
  75         {"showconfig", no_argument, 0, 'c'},
  76         {"show-config", no_argument, 0, 'c'},
  77         {"show-modversions", no_argument, 0, 4},
  78         {"dump-modversions", no_argument, 0, 4},
  79         {"show-exports", no_argument, 0, 6},
  80
  81         {"dry-run", no_argument, 0, 'n'},
  82         {"show", no_argument, 0, 'n'},
  83
  84         {"config", required_argument, 0, 'C'},
  85         {"dirname", required_argument, 0, 'd'},
  86         {"set-version", required_argument, 0, 'S'},
  87
  88         {"syslog", no_argument, 0, 's'},
  89         {"quiet", no_argument, 0, 'q'},
  90         {"verbose", no_argument, 0, 'v'},
  91         {"version", no_argument, 0, 'V'},
  92         {"help", no_argument, 0, 'h'},
  93         {NULL, 0, 0, 0}
  94 };
  95
  96 static void help(void)
  97 {
  98         printf("Usage:\n"
  99                 "\t%s [options] [-i] [-b] modulename\n"
 100                 "\t%s [options] -a [-i] [-b] modulename [modulename...]\n"
 101                 "\t%s [options] -r [-i] modulename\n"
 102                 "\t%s [options] -r -a [-i] modulename [modulename...]\n"
 103                 "\t%s [options] -c\n"
 104                 "\t%s [options] --dump-modversions filename\n"
 105                 "Management Options:\n"
 106                 "\t-a, --all                   Consider every non-argument to\n"
 107                 "\t                            be a module name to be inserted\n"
 108                 "\t                            or removed (-r)\n"
 109                 "\t-r, --remove                Remove modules instead of inserting\n"
 110                 "\t    --remove-dependencies   Also remove modules depending on it\n"
 111                 "\t-R, --resolve-alias         Only lookup and print alias and exit\n"
 112                 "\t    --first-time            Fail if module already inserted or removed\n"
 113                 "\t-i, --ignore-install        Ignore install commands\n"
 114                 "\t-i, --ignore-remove         Ignore remove commands\n"
 115                 "\t-b, --use-blacklist         Apply blacklist to resolved alias.\n"
 116                 "\t-f, --force                 Force module insertion or removal.\n"
 117                 "\t                            implies --force-modversions and\n"
 118                 "\t                            --force-vermagic\n"
 119                 "\t    --force-modversion      Ignore module's version\n"
 120                 "\t    --force-vermagic        Ignore module's version magic\n"
 121                 "\n"
 122                 "Query Options:\n"
 123                 "\t-D, --show-depends          Only print module dependencies and exit\n"
 124                 "\t-c, --showconfig            Print out known configuration and exit\n"
 125                 "\t-c, --show-config           Same as --showconfig\n"
 126                 "\t    --show-modversions      Dump module symbol version and exit\n"
 127                 "\t    --dump-modversions      Same as --show-modversions\n"
 128                 "\t    --show-exports          Only print module exported symbol versions and exit\n"
 129                 "\n"
 130                 "General Options:\n"
 131                 "\t-n, --dry-run               Do not execute operations, just print out\n"
 132                 "\t-n, --show                  Same as --dry-run\n"
 133
 134                 "\t-C, --config=FILE           Use FILE instead of default search paths\n"
 135                 "\t-d, --dirname=DIR           Use DIR as filesystem root for /lib/modules\n"
 136                 "\t-S, --set-version=VERSION   Use VERSION instead of `uname -r`\n"
 137
 138                 "\t-s, --syslog                print to syslog, not stderr\n"
 139                 "\t-q, --quiet                 disable messages\n"
 140                 "\t-v, --verbose               enables more messages\n"
 141                 "\t-V, --version               show version\n"
 142                 "\t-h, --help                  show this help\n",
 143                 program_invocation_short_name, program_invocation_short_name,
 144                 program_invocation_short_name, program_invocation_short_name,
 145                 program_invocation_short_name, program_invocation_short_name);
 146 }
 147
 148 _printf_format_(1, 2)
 149 static inline void _show(const char *fmt, ...)
 150 {
 151         va_list args;
 152
 153         if (!do_show && verbose <= DEFAULT_VERBOSE)
 154                 return;
 155
 156         va_start(args, fmt);
 157         vfprintf(stdout, fmt, args);
 158         fflush(stdout);
 159         va_end(args);
 160 }
 161 #define SHOW(...) _show(__VA_ARGS__)
 162
 163 static int show_config(struct kmod_ctx *ctx)
 164 {
 165         struct config_iterators {
 166                 const char *name;
 167                 struct kmod_config_iter *(*get_iter)(const struct kmod_ctx *ctx);
 168         } ci[] = {
 169                 { "blacklist", kmod_config_get_blacklists },
 170                 { "install", kmod_config_get_install_commands },
 171                 { "remove", kmod_config_get_remove_commands },
 172                 { "alias", kmod_config_get_aliases },
 173                 { "options", kmod_config_get_options },
 174                 { "softdep", kmod_config_get_softdeps },
 175         };
 176         size_t i;
 177
 178         for (i = 0;  i < ARRAY_SIZE(ci); i++) {
 179                 struct kmod_config_iter *iter = ci[i].get_iter(ctx);
 180
 181                 if (iter == NULL)
 182                         continue;
 183
 184                 while (kmod_config_iter_next(iter)) {
 185                         const char *val;
 186
 187                         printf("%s %s", ci[i].name,
 188                                         kmod_config_iter_get_key(iter));
 189                         val = kmod_config_iter_get_value(iter);
 190                         if (val != NULL) {
 191                                 putchar(' ');
 192                                 puts(val);
 193                         } else
 194                                 putchar('\n');
 195                 }
 196
 197                 kmod_config_iter_free_iter(iter);
 198         }
 199
 200         puts("\n# End of configuration files. Dumping indexes now:\n");
 201         fflush(stdout);
 202
 203         kmod_dump_index(ctx, KMOD_INDEX_MODULES_ALIAS, STDOUT_FILENO);
 204         kmod_dump_index(ctx, KMOD_INDEX_MODULES_SYMBOL, STDOUT_FILENO);
 205
 206         return 0;
 207 }
 208
 209 static int show_modversions(struct kmod_ctx *ctx, const char *filename)
 210 {
 211         struct kmod_list *l, *list = NULL;
 212         struct kmod_module *mod;
 213         int err = kmod_module_new_from_path(ctx, filename, &mod);
 214         if (err < 0) {
 215                 LOG("Module %s not found.\n", filename);
 216                 return err;
 217         }
 218
 219         err = kmod_module_get_versions(mod, &list);
 220         if (err < 0) {
 221                 LOG("could not get modversions of %s: %s\n",
 222                         filename, strerror(-err));
 223                 kmod_module_unref(mod);
 224                 return err;
 225         }
 226
 227         kmod_list_foreach(l, list) {
 228                 const char *symbol = kmod_module_version_get_symbol(l);
 229                 uint64_t crc = kmod_module_version_get_crc(l);
 230                 printf("0x%08"PRIx64"\t%s\n", crc, symbol);
 231         }
 232         kmod_module_versions_free_list(list);
 233         kmod_module_unref(mod);
 234         return 0;
 235 }
 236
 237 static int show_exports(struct kmod_ctx *ctx, const char *filename)
 238 {
 239         struct kmod_list *l, *list = NULL;
 240         struct kmod_module *mod;
 241         int err = kmod_module_new_from_path(ctx, filename, &mod);
 242         if (err < 0) {
 243                 LOG("Module %s not found.\n", filename);
 244                 return err;
 245         }
 246
 247         err = kmod_module_get_symbols(mod, &list);
 248         if (err < 0) {
 249                 LOG("could not get symbols of %s: %s\n",
 250                         filename, strerror(-err));
 251                 kmod_module_unref(mod);
 252                 return err;
 253         }
 254
 255         kmod_list_foreach(l, list) {
 256                 const char *symbol = kmod_module_symbol_get_symbol(l);
 257                 uint64_t crc = kmod_module_symbol_get_crc(l);
 258                 printf("0x%08"PRIx64"\t%s\n", crc, symbol);
 259         }
 260         kmod_module_symbols_free_list(list);
 261         kmod_module_unref(mod);
 262         return 0;
 263 }
 264
 265 static int command_do(struct kmod_module *module, const char *type,
 266                                 const char *command, const char *cmdline_opts)
 267 {
 268         const char *modname = kmod_module_get_name(module);
 269         char *p, *cmd = NULL;
 270         size_t cmdlen, cmdline_opts_len, varlen;
 271         int ret = 0;
 272
 273         if (cmdline_opts == NULL)
 274                 cmdline_opts = "";
 275         cmdline_opts_len = strlen(cmdline_opts);
 276
 277         cmd = strdup(command);
 278         if (cmd == NULL)
 279                 return -ENOMEM;
 280         cmdlen = strlen(cmd);
 281         varlen = sizeof("$CMDLINE_OPTS") - 1;
 282         while ((p = strstr(cmd, "$CMDLINE_OPTS")) != NULL) {
 283                 size_t prefixlen = p - cmd;
 284                 size_t suffixlen = cmdlen - prefixlen - varlen;
 285                 size_t slen = cmdlen - varlen + cmdline_opts_len;
 286                 char *suffix = p + varlen;
 287                 char *s = malloc(slen + 1);
 288                 if (s == NULL) {
 289                         free(cmd);
 290                         return -ENOMEM;
 291                 }
 292                 memcpy(s, cmd, p - cmd);
 293                 memcpy(s + prefixlen, cmdline_opts, cmdline_opts_len);
 294                 memcpy(s + prefixlen + cmdline_opts_len, suffix, suffixlen);
 295                 s[slen] = '\0';
 296
 297                 free(cmd);
 298                 cmd = s;
 299                 cmdlen = slen;
 300         }
 301
 302         SHOW("%s %s\n", type, cmd);
 303         if (dry_run)
 304                 goto end;
 305
 306         setenv("MODPROBE_MODULE", modname, 1);
 307         ret = system(cmd);
 308         unsetenv("MODPROBE_MODULE");
 309         if (ret == -1 || WEXITSTATUS(ret)) {
 310                 LOG("Error running %s command for %s\n", type, modname);
 311                 if (ret != -1)
 312                         ret = -WEXITSTATUS(ret);
 313         }
 314
 315 end:
 316         free(cmd);
 317         return ret;
 318 }
 319
 320 static int rmmod_do_remove_module(struct kmod_module *mod)
 321 {
 322         const char *modname = kmod_module_get_name(mod);
 323         struct kmod_list *deps, *itr;
 324         int flags = 0, err;
 325
 326         SHOW("rmmod %s\n", kmod_module_get_name(mod));
 327
 328         if (dry_run)
 329                 return 0;
 330
 331         if (force)
 332                 flags |= KMOD_REMOVE_FORCE;
 333
 334         err = kmod_module_remove_module(mod, flags);
 335         if (err == -EEXIST) {
 336                 if (!first_time)
 337                         err = 0;
 338                 else
 339                         LOG("Module %s is not in kernel.\n", modname);
 340         }
 341
 342         deps = kmod_module_get_dependencies(mod);
 343         if (deps != NULL) {
 344                 kmod_list_foreach(itr, deps) {
 345                         struct kmod_module *dep = kmod_module_get_module(itr);
 346                         if (kmod_module_get_refcnt(dep) == 0)
 347                                 rmmod_do_remove_module(dep);
 348                         kmod_module_unref(dep);
 349                 }
 350                 kmod_module_unref_list(deps);
 351         }
 352
 353         return err;
 354 }
 355
 356 static int rmmod_do_module(struct kmod_module *mod, bool do_dependencies,
 357                            bool ignore_builtin);
 358
 359 static int rmmod_do_deps_list(struct kmod_list *list, bool stop_on_errors)
 360 {
 361         struct kmod_list *l;
 362
 363         kmod_list_foreach_reverse(l, list) {
 364                 struct kmod_module *m = kmod_module_get_module(l);
 365                 int r = rmmod_do_module(m, false, true);
 366                 kmod_module_unref(m);
 367
 368                 if (r < 0 && stop_on_errors)
 369                         return r;
 370         }
 371
 372         return 0;
 373 }
 374
 375 static int rmmod_do_module(struct kmod_module *mod, bool do_dependencies,
 376                            bool ignore_builtin)
 377 {
 378         const char *modname = kmod_module_get_name(mod);
 379         struct kmod_list *pre = NULL, *post = NULL;
 380         const char *cmd = NULL;
 381         int err;
 382
 383         if (!ignore_commands) {
 384                 err = kmod_module_get_softdeps(mod, &pre, &post);
 385                 if (err < 0) {
 386                         WRN("could not get softdeps of '%s': %s\n",
 387                                                 modname, strerror(-err));
 388                         return err;
 389                 }
 390
 391                 cmd = kmod_module_get_remove_commands(mod);
 392         }
 393
 394         if (cmd == NULL && !ignore_loaded) {
 395                 int state = kmod_module_get_initstate(mod);
 396
 397                 if (state < 0) {
 398                         if (first_time) {
 399                                 LOG("Module %s is not in kernel.\n", modname);
 400                                 err = -ENOENT;
 401                         } else {
 402                                 err = 0;
 403                         }
 404                         goto error;
 405                 } else if (state == KMOD_MODULE_BUILTIN) {
 406                         if (ignore_builtin) {
 407                                 err = 0;
 408                         } else {
 409                                 LOG("Module %s is builtin.\n", modname);
 410                                 err = -ENOENT;
 411                         }
 412                         goto error;
 413                 }
 414         }
 415
 416         rmmod_do_deps_list(post, false);
 417
 418         if (do_dependencies && remove_dependencies) {
 419                 struct kmod_list *deps = kmod_module_get_dependencies(mod);
 420
 421                 err = rmmod_do_deps_list(deps, true);
 422                 if (err < 0)
 423                         goto error;
 424         }
 425
 426         if (!ignore_loaded && !cmd) {
 427                 int usage = kmod_module_get_refcnt(mod);
 428
 429                 if (usage > 0) {
 430                         if (!quiet_inuse)
 431                                 LOG("Module %s is in use.\n", modname);
 432
 433                         err = -EBUSY;
 434                         goto error;
 435                 }
 436         }
 437
 438         if (cmd == NULL)
 439                 err = rmmod_do_remove_module(mod);
 440         else
 441                 err = command_do(mod, "remove", cmd, NULL);
 442
 443         if (err < 0)
 444                 goto error;
 445
 446         rmmod_do_deps_list(pre, false);
 447
 448 error:
 449         kmod_module_unref_list(pre);
 450         kmod_module_unref_list(post);
 451
 452         return err;
 453 }
 454
 455 static int rmmod(struct kmod_ctx *ctx, const char *alias)
 456 {
 457         struct kmod_list *l, *list = NULL;
 458         int err;
 459
 460         err = kmod_module_new_from_lookup(ctx, alias, &list);
 461         if (err < 0)
 462                 return err;
 463
 464         if (list == NULL) {
 465                 LOG("Module %s not found.\n", alias);
 466                 err = -ENOENT;
 467         }
 468
 469         kmod_list_foreach(l, list) {
 470                 struct kmod_module *mod = kmod_module_get_module(l);
 471                 err = rmmod_do_module(mod, true, false);
 472                 kmod_module_unref(mod);
 473                 if (err < 0)
 474                         break;
 475         }
 476
 477         kmod_module_unref_list(list);
 478         return err;
 479 }
 480
 481 static int rmmod_all(struct kmod_ctx *ctx, char **args, int nargs)
 482 {
 483         int i, err = 0;
 484
 485         for (i = 0; i < nargs; i++) {
 486                 int r = rmmod(ctx, args[i]);
 487                 if (r < 0)
 488                         err = r;
 489         }
 490
 491         return err;
 492 }
 493
 494 static void print_action(struct kmod_module *m, bool install,
 495                                                         const char *options)
 496 {
 497         const char *path;
 498
 499         if (install) {
 500                 printf("install %s %s\n", kmod_module_get_install_commands(m),
 501                                                                 options);
 502                 return;
 503         }
 504
 505         path = kmod_module_get_path(m);
 506
 507         if (path == NULL) {
 508                 /*
 509                  * Either a builtin module, or an alias, print only for
 510                  * builtin
 511                  */
 512                 if (kmod_module_get_initstate(m) == KMOD_MODULE_BUILTIN)
 513                         printf("builtin %s\n", kmod_module_get_name(m));
 514         } else
 515                 printf("insmod %s %s\n", kmod_module_get_path(m), options);
 516 }
 517
 518 static int insmod(struct kmod_ctx *ctx, const char *alias,
 519                                                 const char *extra_options)
 520 {
 521         struct kmod_list *l, *list = NULL;
 522         int err, flags = 0;
 523
 524         void (*show)(struct kmod_module *m, bool install,
 525                                                 const char *options) = NULL;
 526
 527         err = kmod_module_new_from_lookup(ctx, alias, &list);
 528
 529         if (list == NULL || err < 0) {
 530                 LOG("Module %s not found in directory %s\n", alias,
 531                         ctx ? kmod_get_dirname(ctx) : "(missing)");
 532                 return -ENOENT;
 533         }
 534
 535         if (strip_modversion || force)
 536                 flags |= KMOD_PROBE_FORCE_MODVERSION;
 537         if (strip_vermagic || force)
 538                 flags |= KMOD_PROBE_FORCE_VERMAGIC;
 539         if (ignore_commands)
 540                 flags |= KMOD_PROBE_IGNORE_COMMAND;
 541         if (ignore_loaded)
 542                 flags |= KMOD_PROBE_IGNORE_LOADED;
 543         if (dry_run)
 544                 flags |= KMOD_PROBE_DRY_RUN;
 545         if (do_show || verbose > DEFAULT_VERBOSE)
 546                 show = &print_action;
 547
 548         flags |= KMOD_PROBE_APPLY_BLACKLIST_ALIAS_ONLY;
 549
 550         if (use_blacklist)
 551                 flags |= KMOD_PROBE_APPLY_BLACKLIST;
 552         if (first_time)
 553                 flags |= KMOD_PROBE_FAIL_ON_LOADED;
 554
 555         kmod_list_foreach(l, list) {
 556                 struct kmod_module *mod = kmod_module_get_module(l);
 557
 558                 if (lookup_only)
 559                         printf("%s\n", kmod_module_get_name(mod));
 560                 else {
 561                         err = kmod_module_probe_insert_module(mod, flags,
 562                                         extra_options, NULL, NULL, show);
 563                 }
 564
 565                 if (err >= 0)
 566                         /* ignore flag return values such as a mod being blacklisted */
 567                         err = 0;
 568                 else {
 569                         switch (err) {
 570                         case -EEXIST:
 571                                 ERR("could not insert '%s': Module already in kernel\n",
 572                                                         kmod_module_get_name(mod));
 573                                 break;
 574                         case -ENOENT:
 575                                 ERR("could not insert '%s': Unknown symbol in module, "
 576                                                 "or unknown parameter (see dmesg)\n",
 577                                                 kmod_module_get_name(mod));
 578                                 break;
 579                         default:
 580                                 ERR("could not insert '%s': %s\n",
 581                                                 kmod_module_get_name(mod),
 582                                                 strerror(-err));
 583                                 break;
 584                         }
 585                 }
 586
 587                 kmod_module_unref(mod);
 588         }
 589
 590         kmod_module_unref_list(list);
 591         return err;
 592 }
 593
 594 static int insmod_all(struct kmod_ctx *ctx, char **args, int nargs)
 595 {
 596         int i, err = 0;
 597
 598         for (i = 0; i < nargs; i++) {
 599                 int r = insmod(ctx, args[i], NULL);
 600                 if (r < 0)
 601                         err = r;
 602         }
 603
 604         return err;
 605 }
 606
 607 static void env_modprobe_options_append(const char *value)
 608 {
 609         const char *old = getenv("MODPROBE_OPTIONS");
 610         char *env;
 611
 612         if (old == NULL) {
 613                 setenv("MODPROBE_OPTIONS", value, 1);
 614                 return;
 615         }
 616
 617         if (asprintf(&env, "%s %s", old, value) < 0) {
 618                 ERR("could not append value to $MODPROBE_OPTIONS\n");
 619                 return;
 620         }
 621
 622         if (setenv("MODPROBE_OPTIONS", env, 1) < 0)
 623                 ERR("could not setenv(MODPROBE_OPTIONS, \"%s\")\n", env);
 624         free(env);
 625 }
 626
 627 static int options_from_array(char **args, int nargs, char **output)
 628 {
 629         char *opts = NULL;
 630         size_t optslen = 0;
 631         int i, err = 0;
 632
 633         for (i = 1; i < nargs; i++) {
 634                 size_t len = strlen(args[i]);
 635                 size_t qlen = 0;
 636                 const char *value;
 637                 void *tmp;
 638
 639                 value = strchr(args[i], '=');
 640                 if (value) {
 641                         value++;
 642                         if (*value != '"' && *value != '\'') {
 643                                 if (strchr(value, ' '))
 644                                         qlen = 2;
 645                         }
 646                 }
 647
 648                 tmp = realloc(opts, optslen + len + qlen + 2);
 649                 if (!tmp) {
 650                         err = -errno;
 651                         free(opts);
 652                         opts = NULL;
 653                         ERR("could not gather module options: out-of-memory\n");
 654                         break;
 655                 }
 656                 opts = tmp;
 657                 if (optslen > 0) {
 658                         opts[optslen] = ' ';
 659                         optslen++;
 660                 }
 661                 if (qlen == 0) {
 662                         memcpy(opts + optslen, args[i], len + 1);
 663                         optslen += len;
 664                 } else {
 665                         size_t keylen = value - args[i];
 666                         size_t valuelen = len - keylen;
 667                         memcpy(opts + optslen, args[i], keylen);
 668                         optslen += keylen;
 669                         opts[optslen] = '"';
 670                         optslen++;
 671                         memcpy(opts + optslen, value, valuelen);
 672                         optslen += valuelen;
 673                         opts[optslen] = '"';
 674                         optslen++;
 675                         opts[optslen] = '\0';
 676                 }
 677         }
 678
 679         *output = opts;
 680         return err;
 681 }
 682
 683 static char **prepend_options_from_env(int *p_argc, char **orig_argv)
 684 {
 685         const char *p, *env = getenv("MODPROBE_OPTIONS");
 686         char **new_argv, *str_start, *str_end, *str, *s, *quote;
 687         int i, argc = *p_argc;
 688         size_t envlen, space_count = 0;
 689
 690         if (env == NULL)
 691                 return orig_argv;
 692
 693         for (p = env; *p != '\0'; p++) {
 694                 if (*p == ' ')
 695                         space_count++;
 696         }
 697
 698         envlen = p - env;
 699         new_argv = malloc(sizeof(char *) * (argc + space_count + 3 + envlen));
 700         if (new_argv == NULL)
 701                 return NULL;
 702
 703         new_argv[0] = orig_argv[0];
 704         str_start = str = (char *) (new_argv + argc + space_count + 3);
 705         memcpy(str, env, envlen + 1);
 706
 707         str_end = str_start + envlen;
 708
 709         quote = NULL;
 710         for (i = 1, s = str; *s != '\0'; s++) {
 711                 if (quote == NULL) {
 712                         if (*s == ' ') {
 713                                 new_argv[i] = str;
 714                                 i++;
 715                                 *s = '\0';
 716                                 str = s + 1;
 717                         } else if (*s == '"' || *s == '\'')
 718                                 quote = s;
 719                 } else {
 720                         if (*s == *quote) {
 721                                 if (quote == str) {
 722                                         new_argv[i] = str + 1;
 723                                         i++;
 724                                         *s = '\0';
 725                                         str = s + 1;
 726                                 } else {
 727                                         char *it;
 728                                         for (it = quote; it < s - 1; it++)
 729                                                 it[0] = it[1];
 730                                         for (it = s - 1; it < str_end - 2; it++)
 731                                                 it[0] = it[2];
 732                                         str_end -= 2;
 733                                         *str_end = '\0';
 734                                         s -= 2;
 735                                 }
 736                                 quote = NULL;
 737                         }
 738                 }
 739         }
 740         if (str < s) {
 741                 new_argv[i] = str;
 742                 i++;
 743         }
 744
 745         memcpy(new_argv + i, orig_argv + 1, sizeof(char *) * (argc - 1));
 746         new_argv[i + argc] = NULL;
 747         *p_argc = i + argc - 1;
 748
 749         return new_argv;
 750 }
 751
 752 static int do_modprobe(int argc, char **orig_argv)
 753 {
 754         struct kmod_ctx *ctx;
 755         char **args = NULL, **argv;
 756         const char **config_paths = NULL;
 757         int nargs = 0, n_config_paths = 0;
 758         char dirname_buf[PATH_MAX];
 759         const char *dirname = NULL;
 760         const char *root = NULL;
 761         const char *kversion = NULL;
 762         int use_all = 0;
 763         int do_remove = 0;
 764         int do_show_config = 0;
 765         int do_show_modversions = 0;
 766         int do_show_exports = 0;
 767         int err;
 768
 769         argv = prepend_options_from_env(&argc, orig_argv);
 770         if (argv == NULL) {
 771                 ERR("Could not prepend options from command line\n");
 772                 return EXIT_FAILURE;
 773         }
 774
 775         for (;;) {
 776                 int c, idx = 0;
 777                 c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
 778                 if (c == -1)
 779                         break;
 780                 switch (c) {
 781                 case 'a':
 782                         log_priority = LOG_WARNING;
 783                         use_all = 1;
 784                         break;
 785                 case 'r':
 786                         do_remove = 1;
 787                         break;
 788                 case 5:
 789                         remove_dependencies = 1;
 790                         break;
 791                 case 'R':
 792                         lookup_only = 1;
 793                         break;
 794                 case 3:
 795                         first_time = 1;
 796                         break;
 797                 case 'i':
 798                         ignore_commands = 1;
 799                         break;
 800                 case 'b':
 801                         use_blacklist = 1;
 802                         break;
 803                 case 'f':
 804                         force = 1;
 805                         break;
 806                 case 2:
 807                         strip_modversion = 1;
 808                         break;
 809                 case 1:
 810                         strip_vermagic = 1;
 811                         break;
 812                 case 'D':
 813                         ignore_loaded = 1;
 814                         dry_run = 1;
 815                         do_show = 1;
 816                         break;
 817                 case 'c':
 818                         do_show_config = 1;
 819                         break;
 820                 case 4:
 821                         do_show_modversions = 1;
 822                         break;
 823                 case 6:
 824                         do_show_exports = 1;
 825                         break;
 826                 case 'n':
 827                         dry_run = 1;
 828                         break;
 829                 case 'C': {
 830                         size_t bytes = sizeof(char *) * (n_config_paths + 2);
 831                         void *tmp = realloc(config_paths, bytes);
 832                         if (!tmp) {
 833                                 ERR("out-of-memory\n");
 834                                 err = -1;
 835                                 goto done;
 836                         }
 837                         config_paths = tmp;
 838                         config_paths[n_config_paths] = optarg;
 839                         n_config_paths++;
 840                         config_paths[n_config_paths] = NULL;
 841
 842                         env_modprobe_options_append("-C");
 843                         env_modprobe_options_append(optarg);
 844                         break;
 845                 }
 846                 case 'd':
 847                         root = optarg;
 848                         break;
 849                 case 'S':
 850                         kversion = optarg;
 851                         break;
 852                 case 's':
 853                         env_modprobe_options_append("-s");
 854                         use_syslog = 1;
 855                         break;
 856                 case 'q':
 857                         env_modprobe_options_append("-q");
 858                         verbose = LOG_EMERG;
 859                         break;
 860                 case 'v':
 861                         env_modprobe_options_append("-v");
 862                         verbose++;
 863                         break;
 864                 case 'V':
 865                         puts(PACKAGE " version " VERSION);
 866                         puts(KMOD_FEATURES);
 867                         err = 0;
 868                         goto done;
 869                 case 'h':
 870                         help();
 871                         err = 0;
 872                         goto done;
 873                 case '?':
 874                         err = -1;
 875                         goto done;
 876                 default:
 877                         ERR("unexpected getopt_long() value '%c'.\n", c);
 878                         err = -1;
 879                         goto done;
 880                 }
 881         }
 882
 883         args = argv + optind;
 884         nargs = argc - optind;
 885
 886         log_open(use_syslog);
 887
 888         if (!do_show_config) {
 889                 if (nargs == 0) {
 890                         ERR("missing parameters. See -h.\n");
 891                         err = -1;
 892                         goto done;
 893                 }
 894         }
 895
 896         if (root != NULL || kversion != NULL) {
 897                 struct utsname u;
 898                 if (root == NULL)
 899                         root = "";
 900                 if (kversion == NULL) {
 901                         if (uname(&u) < 0) {
 902                                 ERR("uname() failed: %m\n");
 903                                 err = -1;
 904                                 goto done;
 905                         }
 906                         kversion = u.release;
 907                 }
 908                 snprintf(dirname_buf, sizeof(dirname_buf),
 909                                 "%s/lib/modules/%s", root,
 910                                 kversion);
 911                 dirname = dirname_buf;
 912         }
 913
 914         ctx = kmod_new(dirname, config_paths);
 915         if (!ctx) {
 916                 ERR("kmod_new() failed!\n");
 917                 err = -1;
 918                 goto done;
 919         }
 920
 921         log_setup_kmod_log(ctx, verbose);
 922
 923         kmod_load_resources(ctx);
 924
 925         if (do_show_config)
 926                 err = show_config(ctx);
 927         else if (do_show_modversions)
 928                 err = show_modversions(ctx, args[0]);
 929         else if (do_show_exports)
 930                 err = show_exports(ctx, args[0]);
 931         else if (do_remove)
 932                 err = rmmod_all(ctx, args, nargs);
 933         else if (use_all)
 934                 err = insmod_all(ctx, args, nargs);
 935         else {
 936                 char *opts;
 937                 err = options_from_array(args, nargs, &opts);
 938                 if (err == 0) {
 939                         err = insmod(ctx, args[0], opts);
 940                         free(opts);
 941                 }
 942         }
 943
 944         kmod_unref(ctx);
 945
 946 done:
 947         log_close();
 948
 949         if (argv != orig_argv)
 950                 free(argv);
 951
 952         free(config_paths);
 953
 954         return err >= 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 955 }
 956
 957 const struct kmod_cmd kmod_cmd_compat_modprobe = {
 958         .name = "modprobe",
 959         .cmd = do_modprobe,
 960         .help = "compat modprobe command",
 961 };