kmodloader.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <sys/syscall.h>
  17 #include <sys/mman.h>
  18 #include <sys/utsname.h>
  19
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <sys/syscall.h>
  23 #include <sys/types.h>
  24 #include <values.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <libgen.h>
  31 #include <glob.h>
  32 #include <elf.h>
  33
  34 #include <libubox/avl.h>
  35 #include <libubox/avl-cmp.h>
  36 #include <libubox/utils.h>
  37 #include <libubox/ulog.h>
  38
  39 #define DEF_MOD_PATH "/modules/%s/"
  40
  41 enum {
  42         SCANNED,
  43         PROBE,
  44         LOADED,
  45 };
  46
  47 struct module {
  48         char *name;
  49         char *depends;
  50         char *opts;
  51         char **aliases;
  52         int naliases;
  53
  54         int size;
  55         int usage;
  56         int state;
  57         int error;
  58         int refcnt;                     /* number of references from module_node.m */
  59 };
  60
  61 struct module_node {
  62         struct avl_node avl;
  63         struct module *m;
  64         bool is_alias;
  65 };
  66
  67 static struct avl_tree modules;
  68
  69 static char **module_folders = NULL;
  70
  71 static void free_module(struct module *m);
  72
  73 static int init_module_folders(void)
  74 {
  75         int n = 0;
  76         struct stat st;
  77         struct utsname ver;
  78         char *s, *e, *p, path[256], ldpath[256];
  79
  80         e = ldpath;
  81         s = getenv("LD_LIBRARY_PATH");
  82
  83         if (s)
  84                 e += snprintf(ldpath, sizeof(ldpath), "%s:", s);
  85
  86         e += snprintf(e, sizeof(ldpath) - (e - ldpath), "/lib");
  87
  88         uname(&ver);
  89
  90         for (s = p = ldpath; p <= e; p++) {
  91                 if (*p != ':' && *p != '\0')
  92                         continue;
  93
  94                 *p = 0;
  95                 snprintf(path, sizeof(path), "%s" DEF_MOD_PATH, s, ver.release);
  96
  97                 if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
  98                         module_folders = realloc(module_folders, sizeof(p) * (n + 2));
  99
 100                         if (!module_folders)
 101                                 return -1;
 102
 103                         module_folders[n++] = strdup(path);
 104                 }
 105
 106                 s = p + 1;
 107         }
 108
 109         if (!module_folders)
 110                 return -1;
 111
 112         module_folders[n] = NULL;
 113         return 0;
 114 }
 115
 116 static struct module *find_module(const char *name)
 117 {
 118         struct module_node *mn;
 119         mn = avl_find_element(&modules, name, mn, avl);
 120         if (mn)
 121                 return mn->m;
 122         else
 123                 return NULL;
 124 }
 125
 126 static void free_modules(void)
 127 {
 128         struct module_node *mn, *tmp;
 129
 130         avl_remove_all_elements(&modules, mn, avl, tmp) {
 131                 struct module *m = mn->m;
 132
 133                 m->refcnt -= 1;
 134                 if (m->refcnt == 0)
 135                         free_module(m);
 136                 free(mn);
 137         }
 138 }
 139
 140 static char* get_module_path(char *name)
 141 {
 142         char **p;
 143         static char path[256];
 144         struct stat s;
 145
 146         if (!stat(name, &s) && S_ISREG(s.st_mode))
 147                 return name;
 148
 149         for (p = module_folders; *p; p++) {
 150                 snprintf(path, sizeof(path), "%s%s.ko", *p, name);
 151                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 152                         return path;
 153         }
 154
 155         return NULL;
 156 }
 157
 158 static char* get_module_name(char *path)
 159 {
 160         static char name[32];
 161         char *t;
 162
 163         strncpy(name, basename(path), sizeof(name));
 164
 165         t = strstr(name, ".ko");
 166         if (t)
 167                 *t = '\0';
 168
 169         return name;
 170 }
 171
 172 static int elf64_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 173 {
 174         const char *secnames;
 175         Elf64_Ehdr *e;
 176         Elf64_Shdr *sh;
 177         int i;
 178
 179         e = (Elf64_Ehdr *) map;
 180         sh = (Elf64_Shdr *) (map + e->e_shoff);
 181
 182         secnames = map + sh[e->e_shstrndx].sh_offset;
 183         for (i = 0; i < e->e_shnum; i++) {
 184                 if (!strcmp(section, secnames + sh[i].sh_name)) {
 185                         *size = sh[i].sh_size;
 186                         *offset = sh[i].sh_offset;
 187                         return 0;
 188                 }
 189         }
 190
 191         return -1;
 192 }
 193
 194 static int elf32_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 195 {
 196         const char *secnames;
 197         Elf32_Ehdr *e;
 198         Elf32_Shdr *sh;
 199         int i;
 200
 201         e = (Elf32_Ehdr *) map;
 202         sh = (Elf32_Shdr *) (map + e->e_shoff);
 203
 204         secnames = map + sh[e->e_shstrndx].sh_offset;
 205         for (i = 0; i < e->e_shnum; i++) {
 206                 if (!strcmp(section, secnames + sh[i].sh_name)) {
 207                         *size = sh[i].sh_size;
 208                         *offset = sh[i].sh_offset;
 209                         return 0;
 210                 }
 211         }
 212
 213         return -1;
 214 }
 215
 216 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 217 {
 218         int clazz = map[EI_CLASS];
 219
 220         if (clazz == ELFCLASS32)
 221                 return elf32_find_section(map, section, offset, size);
 222         else if (clazz == ELFCLASS64)
 223                 return elf64_find_section(map, section, offset, size);
 224
 225         ULOG_ERR("unknown elf format %d\n", clazz);
 226
 227         return -1;
 228 }
 229
 230 static struct module_node *
 231 alloc_module_node(const char *name, struct module *m, bool is_alias)
 232 {
 233         struct module_node *mn;
 234         char *_name;
 235
 236         mn = calloc_a(sizeof(*mn),
 237                 &_name, strlen(name) + 1);
 238         if (mn) {
 239                 mn->avl.key = strcpy(_name, name);
 240                 mn->m = m;
 241                 mn->is_alias = is_alias;
 242                 avl_insert(&modules, &mn->avl);
 243                 m->refcnt += 1;
 244         }
 245         return mn;
 246 }
 247
 248 static struct module *
 249 alloc_module(const char *name, const char * const *aliases, int naliases, const char *depends, int size)
 250 {
 251         struct module *m;
 252         char *_name, *_dep;
 253         char **_aliases;
 254         int i, len_aliases;
 255
 256         len_aliases = naliases * sizeof(aliases[0]);
 257         for (i = 0; i < naliases; i++)
 258                 len_aliases += strlen(aliases[i]) + 1;
 259         m = calloc_a(sizeof(*m),
 260                 &_name, strlen(name) + 1,
 261                 &_dep, depends ? strlen(depends) + 2 : 0,
 262                 &_aliases, len_aliases);
 263         if (!m)
 264                 return NULL;
 265
 266         m->name = strcpy(_name, name);
 267         m->opts = 0;
 268
 269         if (depends) {
 270                 m->depends = strcpy(_dep, depends);
 271                 while (*_dep) {
 272                         if (*_dep == ',')
 273                                 *_dep = '\0';
 274                         _dep++;
 275                 }
 276         }
 277         m->size = size;
 278         m->naliases = naliases;
 279         if (naliases == 0)
 280                 m->aliases = NULL;
 281         else {
 282                 char *ptr = (char *)_aliases + naliases * sizeof(_aliases[0]);
 283                 int len;
 284
 285                 i = 0;
 286                 do {
 287                         len = strlen(aliases[i]) + 1;
 288                         memcpy(ptr, aliases[i], len);
 289                         _aliases[i] = ptr;
 290                         ptr += len;
 291                         i++;
 292                 } while (i < naliases);
 293                 m->aliases = _aliases;
 294         }
 295
 296         m->refcnt = 0;
 297         alloc_module_node(m->name, m, false);
 298         for (i = 0; i < m->naliases; i++)
 299                 alloc_module_node(m->aliases[i], m, true);
 300
 301         return m;
 302 }
 303
 304 static void free_module(struct module *m)
 305 {
 306         if (m->opts)
 307                 free(m->opts);
 308         free(m);
 309 }
 310
 311 static int scan_loaded_modules(void)
 312 {
 313         size_t buf_len = 0;
 314         char *buf = NULL;
 315         FILE *fp;
 316
 317         fp = fopen("/proc/modules", "r");
 318         if (!fp) {
 319                 ULOG_ERR("failed to open /proc/modules\n");
 320                 return -1;
 321         }
 322
 323         while (getline(&buf, &buf_len, fp) > 0) {
 324                 struct module m;
 325                 struct module *n;
 326
 327                 m.name = strtok(buf, " ");
 328                 m.size = atoi(strtok(NULL, " "));
 329                 m.usage = atoi(strtok(NULL, " "));
 330                 m.depends = strtok(NULL, " ");
 331
 332                 if (!m.name || !m.depends)
 333                         continue;
 334
 335                 n = find_module(m.name);
 336                 if (!n) {
 337                         /* possibly a module outside /lib/modules/<ver>/ */
 338                         n = alloc_module(m.name, NULL, 0, m.depends, m.size);
 339                 }
 340                 n->usage = m.usage;
 341                 n->state = LOADED;
 342         }
 343         free(buf);
 344         fclose(fp);
 345
 346         return 0;
 347 }
 348
 349 static struct module* get_module_info(const char *module, const char *name)
 350 {
 351         int fd = open(module, O_RDONLY);
 352         unsigned int offset, size;
 353         char *map = MAP_FAILED, *strings, *dep = NULL;
 354         const char *aliases[32];
 355         int naliases = 0;
 356         struct module *m = NULL;
 357         struct stat s;
 358
 359         if (fd < 0) {
 360                 ULOG_ERR("failed to open %s\n", module);
 361                 goto out;
 362         }
 363
 364         if (fstat(fd, &s) == -1) {
 365                 ULOG_ERR("failed to stat %s\n", module);
 366                 goto out;
 367         }
 368
 369         map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 370         if (map == MAP_FAILED) {
 371                 ULOG_ERR("failed to mmap %s\n", module);
 372                 goto out;
 373         }
 374
 375         if (elf_find_section(map, ".modinfo", &offset, &size)) {
 376                 ULOG_ERR("failed to load the .modinfo section from %s\n", module);
 377                 goto out;
 378         }
 379
 380         strings = map + offset;
 381         while (true) {
 382                 char *sep;
 383                 int len;
 384
 385                 while (!strings[0])
 386                         strings++;
 387                 if (strings >= map + offset + size)
 388                         break;
 389                 sep = strstr(strings, "=");
 390                 if (!sep)
 391                         break;
 392                 len = sep - strings;
 393                 sep++;
 394                 if (!strncmp(strings, "depends=", len + 1))
 395                         dep = sep;
 396                 else if (!strncmp(strings, "alias=", len + 1)) {
 397                         if (naliases < ARRAY_SIZE(aliases))
 398                                 aliases[naliases++] = sep;
 399                         else
 400                                 ULOG_WARN("module %s has more than %d aliases: truncated",
 401                                                 name, ARRAY_SIZE(aliases));
 402                 }
 403                 strings = &sep[strlen(sep)];
 404         }
 405
 406         m = alloc_module(name, aliases, naliases, dep, s.st_size);
 407
 408         if (m)
 409                 m->state = SCANNED;
 410
 411 out:
 412         if (map != MAP_FAILED)
 413                 munmap(map, s.st_size);
 414
 415         if (fd >= 0)
 416                 close(fd);
 417
 418         return m;
 419 }
 420
 421 static int scan_module_folder(const char *dir)
 422 {
 423         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 424         struct utsname ver;
 425         char *path;
 426         glob_t gl;
 427         int j;
 428
 429         uname(&ver);
 430         path = alloca(strlen(dir) + sizeof("*.ko") + 1);
 431         sprintf(path, "%s*.ko", dir);
 432
 433         if (glob(path, gl_flags, NULL, &gl) < 0)
 434                 return -1;
 435
 436         for (j = 0; j < gl.gl_pathc; j++) {
 437                 char *name = get_module_name(gl.gl_pathv[j]);
 438                 struct module *m;
 439
 440                 if (!name)
 441                         continue;
 442
 443                 m = find_module(name);
 444                 if (!m)
 445                         get_module_info(gl.gl_pathv[j], name);
 446         }
 447
 448         globfree(&gl);
 449
 450         return 0;
 451 }
 452
 453 static int scan_module_folders(void)
 454 {
 455         int rv = 0;
 456         char **p;
 457
 458         if (init_module_folders())
 459                 return -1;
 460
 461         for (p = module_folders; *p; p++)
 462                 rv |= scan_module_folder(*p);
 463
 464         return rv;
 465 }
 466
 467 static int print_modinfo(char *module)
 468 {
 469         int fd = open(module, O_RDONLY);
 470         unsigned int offset, size;
 471         struct stat s;
 472         char *map = MAP_FAILED, *strings;
 473         int rv = -1;
 474
 475         if (fd < 0) {
 476                 ULOG_ERR("failed to open %s\n", module);
 477                 goto out;
 478         }
 479
 480         if (fstat(fd, &s) == -1) {
 481                 ULOG_ERR("failed to stat %s\n", module);
 482                 goto out;
 483         }
 484
 485         map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 486         if (map == MAP_FAILED) {
 487                 ULOG_ERR("failed to mmap %s\n", module);
 488                 goto out;
 489         }
 490
 491         if (elf_find_section(map, ".modinfo", &offset, &size)) {
 492                 ULOG_ERR("failed to load the .modinfo section from %s\n", module);
 493                 goto out;
 494         }
 495
 496         strings = map + offset;
 497         printf("module:\t\t%s\n", module);
 498         while (true) {
 499                 char *dup = NULL;
 500                 char *sep;
 501
 502                 while (!strings[0])
 503                         strings++;
 504                 if (strings >= map + offset + size)
 505                         break;
 506                 sep = strstr(strings, "=");
 507                 if (!sep)
 508                         break;
 509                 dup = strndup(strings, sep - strings);
 510                 sep++;
 511                 if (strncmp(strings, "parm", 4)) {
 512                         if (strlen(dup) < 7)
 513                                 printf("%s:\t\t%s\n",  dup, sep);
 514                         else
 515                                 printf("%s:\t%s\n",  dup, sep);
 516                 }
 517                 strings = &sep[strlen(sep)];
 518                 if (dup)
 519                         free(dup);
 520         }
 521
 522         rv = 0;
 523
 524 out:
 525         if (map != MAP_FAILED)
 526                 munmap(map, s.st_size);
 527
 528         if (fd >= 0)
 529                 close(fd);
 530
 531         return rv;
 532 }
 533
 534 static int deps_available(struct module *m, int verbose)
 535 {
 536         char *dep;
 537         int err = 0;
 538
 539         if (!m->depends || !strcmp(m->depends, "-") || !strcmp(m->depends, ""))
 540                 return 0;
 541
 542         dep = m->depends;
 543
 544         while (*dep) {
 545                 m = find_module(dep);
 546
 547                 if (verbose && !m)
 548                         ULOG_ERR("missing dependency %s\n", dep);
 549                 if (verbose && m && (m->state != LOADED))
 550                         ULOG_ERR("dependency not loaded %s\n", dep);
 551                 if (!m || (m->state != LOADED))
 552                         err++;
 553                 dep += strlen(dep) + 1;
 554         }
 555
 556         return err;
 557 }
 558
 559 static int insert_module(char *path, const char *options)
 560 {
 561         void *data = 0;
 562         struct stat s;
 563         int fd, ret = -1;
 564
 565         if (stat(path, &s)) {
 566                 ULOG_ERR("missing module %s\n", path);
 567                 return ret;
 568         }
 569
 570         fd = open(path, O_RDONLY);
 571         if (fd < 0) {
 572                 ULOG_ERR("cannot open %s\n", path);
 573                 return ret;
 574         }
 575
 576         data = malloc(s.st_size);
 577         if (read(fd, data, s.st_size) == s.st_size) {
 578                 ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
 579                 if (errno == EEXIST)
 580                         ret = 0;
 581         }
 582         else
 583                 ULOG_ERR("failed to read full module %s\n", path);
 584
 585         close(fd);
 586         free(data);
 587
 588         return ret;
 589 }
 590
 591 static void load_moddeps(struct module *_m)
 592 {
 593         char *dep;
 594         struct module *m;
 595
 596         if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
 597                 return;
 598
 599         dep = _m->depends;
 600
 601         while (*dep) {
 602                 m = find_module(dep);
 603
 604                 if (!m)
 605                         ULOG_ERR("failed to find dependency %s\n", dep);
 606                 if (m && (m->state != LOADED)) {
 607                         m->state = PROBE;
 608                         load_moddeps(m);
 609                 }
 610
 611                 dep = dep + strlen(dep) + 1;
 612         }
 613 }
 614
 615 static int iterations = 0;
 616 static int load_modprobe(void)
 617 {
 618         int loaded, todo;
 619         struct module_node *mn;
 620         struct module *m;
 621
 622         avl_for_each_element(&modules, mn, avl) {
 623                 if (mn->is_alias)
 624                         continue;
 625                 m = mn->m;
 626                 if (m->state == PROBE)
 627                         load_moddeps(m);
 628         }
 629
 630         do {
 631                 loaded = 0;
 632                 todo = 0;
 633                 avl_for_each_element(&modules, mn, avl) {
 634                         if (mn->is_alias)
 635                                 continue;
 636                         m = mn->m;
 637                         if ((m->state == PROBE) && (!deps_available(m, 0))) {
 638                                 if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
 639                                         m->state = LOADED;
 640                                         m->error = 0;
 641                                         loaded++;
 642                                         continue;
 643                                 }
 644                                 m->error = 1;
 645                         }
 646
 647                         if ((m->state == PROBE) || m->error)
 648                                 todo++;
 649                 }
 650                 iterations++;
 651         } while (loaded);
 652
 653         return todo;
 654 }
 655
 656 static int print_insmod_usage(void)
 657 {
 658         ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
 659
 660         return -1;
 661 }
 662
 663 static int print_modprobe_usage(void)
 664 {
 665         ULOG_INFO("Usage:\n\tmodprobe [-q] filename\n");
 666
 667         return -1;
 668 }
 669
 670 static int print_usage(char *arg)
 671 {
 672         ULOG_INFO("Usage:\n\t%s module\n", arg);
 673
 674         return -1;
 675 }
 676
 677 static int main_insmod(int argc, char **argv)
 678 {
 679         char *name, *cur, *options;
 680         int i, ret, len;
 681
 682         if (argc < 2)
 683                 return print_insmod_usage();
 684
 685         name = get_module_name(argv[1]);
 686         if (!name) {
 687                 ULOG_ERR("cannot find module - %s\n", argv[1]);
 688                 return -1;
 689         }
 690
 691         if (scan_loaded_modules())
 692                 return -1;
 693
 694         if (find_module(name)) {
 695                 ULOG_ERR("module is already loaded - %s\n", name);
 696                 return -1;
 697
 698         }
 699
 700         free_modules();
 701
 702         for (len = 0, i = 2; i < argc; i++)
 703                 len += strlen(argv[i]) + 1;
 704
 705         options = malloc(len);
 706         options[0] = 0;
 707         cur = options;
 708         for (i = 2; i < argc; i++) {
 709                 if (options[0]) {
 710                         *cur = ' ';
 711                         cur++;
 712                 }
 713                 cur += sprintf(cur, "%s", argv[i]);
 714         }
 715
 716         if (init_module_folders()) {
 717                 fprintf(stderr, "Failed to find the folder holding the modules\n");
 718                 return -1;
 719         }
 720
 721         if (get_module_path(argv[1])) {
 722                 name = argv[1];
 723         } else if (!get_module_path(name)) {
 724                 fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
 725                 return -1;
 726         }
 727
 728         ret = insert_module(get_module_path(name), options);
 729         free(options);
 730
 731         if (ret)
 732                 ULOG_ERR("failed to insert %s\n", get_module_path(name));
 733
 734         return ret;
 735 }
 736
 737 static int main_rmmod(int argc, char **argv)
 738 {
 739         struct module *m;
 740         char *name;
 741         int ret;
 742
 743         if (argc != 2)
 744                 return print_usage("rmmod");
 745
 746         if (scan_loaded_modules())
 747                 return -1;
 748
 749         name = get_module_name(argv[1]);
 750         m = find_module(name);
 751         if (!m) {
 752                 ULOG_ERR("module is not loaded\n");
 753                 return -1;
 754         }
 755         ret = syscall(__NR_delete_module, m->name, 0);
 756
 757         if (ret)
 758                 ULOG_ERR("unloading the module failed\n");
 759
 760         free_modules();
 761
 762         return ret;
 763 }
 764
 765 static int main_lsmod(int argc, char **argv)
 766 {
 767         struct module_node *mn;
 768         struct module *m;
 769         char *dep;
 770
 771         if (scan_loaded_modules())
 772                 return -1;
 773
 774         avl_for_each_element(&modules, mn, avl) {
 775                 if (mn->is_alias)
 776                         continue;
 777                 m = mn->m;
 778                 if (m->state == LOADED) {
 779                         printf("%-20s%8d%3d ",
 780                                 m->name, m->size, m->usage);
 781                         if (m->depends && strcmp(m->depends, "-") && strcmp(m->depends, "")) {
 782                                 dep = m->depends;
 783                                 while (*dep) {
 784                                         printf("%s", dep);
 785                                         dep = dep + strlen(dep) + 1;
 786                                         if (*dep)
 787                                                 printf(",");
 788                                 }
 789                         }
 790                         printf("\n");
 791                 }
 792         }
 793
 794         free_modules();
 795
 796         return 0;
 797 }
 798
 799 static int main_modinfo(int argc, char **argv)
 800 {
 801         struct module *m;
 802         char *name;
 803
 804         if (argc != 2)
 805                 return print_usage("modinfo");
 806
 807         if (scan_module_folders())
 808                 return -1;
 809
 810         name = get_module_name(argv[1]);
 811         m = find_module(name);
 812         if (!m) {
 813                 ULOG_ERR("cannot find module - %s\n", argv[1]);
 814                 return -1;
 815         }
 816
 817         name = get_module_path(m->name);
 818         if (!name) {
 819                 ULOG_ERR("cannot find path of module - %s\n", m->name);
 820                 return -1;
 821         }
 822
 823         print_modinfo(name);
 824
 825         return 0;
 826 }
 827
 828 static int main_modprobe(int argc, char **argv)
 829 {
 830         struct module_node *mn;
 831         struct module *m;
 832         char *name;
 833         char *mod = NULL;
 834         int opt;
 835         bool quiet = false;
 836
 837         while ((opt = getopt(argc, argv, "q")) != -1 ) {
 838                 switch (opt) {
 839                         case 'q': /* shhhh! */
 840                                 quiet = true;
 841                                 break;
 842                         default: /* '?' */
 843                                 return print_modprobe_usage();
 844                                 break;
 845                         }
 846         }
 847
 848         if (optind >= argc)
 849                 return print_modprobe_usage(); /* expected module after options */
 850
 851         mod = argv[optind];
 852
 853         if (scan_module_folders())
 854                 return -1;
 855
 856         if (scan_loaded_modules())
 857                 return -1;
 858
 859         name = get_module_name(mod);
 860         m = find_module(name);
 861         if (m && m->state == LOADED) {
 862                 if (!quiet)
 863                         ULOG_ERR("%s is already loaded\n", name);
 864                 return -1;
 865         } else if (!m) {
 866                 if (!quiet)
 867                         ULOG_ERR("failed to find a module named %s\n", name);
 868                 return -1;
 869         } else {
 870                 int fail;
 871
 872                 m->state = PROBE;
 873
 874                 fail = load_modprobe();
 875
 876                 if (fail) {
 877                         ULOG_ERR("%d module%s could not be probed\n",
 878                                  fail, (fail == 1) ? ("") : ("s"));
 879
 880                         avl_for_each_element(&modules, mn, avl) {
 881                                 if (mn->is_alias)
 882                                         continue;
 883                                 m = mn->m;
 884                                 if ((m->state == PROBE) || m->error)
 885                                         ULOG_ERR("- %s\n", m->name);
 886                         }
 887                 }
 888         }
 889
 890         free_modules();
 891
 892         return 0;
 893 }
 894
 895 static int main_loader(int argc, char **argv)
 896 {
 897         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 898         char *dir = "/etc/modules.d/";
 899         struct module_node *mn;
 900         struct module *m;
 901         glob_t gl;
 902         char *path;
 903         int fail, j;
 904
 905         if (argc > 1)
 906                 dir = argv[1];
 907
 908         path = malloc(strlen(dir) + 2);
 909         strcpy(path, dir);
 910         strcat(path, "*");
 911
 912         if (scan_module_folders()) {
 913                 free (path);
 914                 return -1;
 915         }
 916
 917         if (scan_loaded_modules()) {
 918                 free (path);
 919                 return -1;
 920         }
 921
 922         ULOG_INFO("loading kernel modules from %s\n", path);
 923
 924         if (glob(path, gl_flags, NULL, &gl) < 0)
 925                 goto out;
 926
 927         for (j = 0; j < gl.gl_pathc; j++) {
 928                 FILE *fp = fopen(gl.gl_pathv[j], "r");
 929                 size_t mod_len = 0;
 930                 char *mod = NULL;
 931
 932                 if (!fp) {
 933                         ULOG_ERR("failed to open %s\n", gl.gl_pathv[j]);
 934                         continue;
 935                 }
 936
 937                 while (getline(&mod, &mod_len, fp) > 0) {
 938                         char *nl = strchr(mod, '\n');
 939                         struct module *m;
 940                         char *opts;
 941
 942                         if (nl)
 943                                 *nl = '\0';
 944
 945                         opts = strchr(mod, ' ');
 946                         if (opts)
 947                                 *opts++ = '\0';
 948
 949                         m = find_module(get_module_name(mod));
 950                         if (!m || (m->state == LOADED))
 951                                 continue;
 952
 953                         if (opts)
 954                                 m->opts = strdup(opts);
 955                         m->state = PROBE;
 956                         if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
 957                                 load_modprobe();
 958
 959                 }
 960                 free(mod);
 961                 fclose(fp);
 962         }
 963
 964         fail = load_modprobe();
 965
 966         if (fail) {
 967                 ULOG_ERR("%d module%s could not be probed\n",
 968                          fail, (fail == 1) ? ("") : ("s"));
 969
 970                 avl_for_each_element(&modules, mn, avl) {
 971                         if (mn->is_alias)
 972                                 continue;
 973                         m = mn->m;
 974                         if ((m->state == PROBE) || (m->error))
 975                                 ULOG_ERR("- %s - %d\n", m->name, deps_available(m, 1));
 976                 }
 977         } else {
 978                 ULOG_INFO("done loading kernel modules from %s\n", path);
 979         }
 980
 981 out:
 982         globfree(&gl);
 983         free(path);
 984
 985         return 0;
 986 }
 987
 988 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
 989 {
 990         const char *s1 = k1;
 991         const char *s2 = k2;
 992
 993         while (*s1 && ((*s1 == *s2) ||
 994                        ((*s1 == '_') && (*s2 == '-')) ||
 995                        ((*s1 == '-') && (*s2 == '_'))))
 996         {
 997                 s1++;
 998                 s2++;
 999         }
1000
1001         return *(const unsigned char *)s1 - *(const unsigned char *)s2;
1002 }
1003
1004 int main(int argc, char **argv)
1005 {
1006         char *exec = basename(*argv);
1007
1008         avl_init(&modules, avl_modcmp, false, NULL);
1009         if (!strcmp(exec, "insmod"))
1010                 return main_insmod(argc, argv);
1011
1012         if (!strcmp(exec, "rmmod"))
1013                 return main_rmmod(argc, argv);
1014
1015         if (!strcmp(exec, "lsmod"))
1016                 return main_lsmod(argc, argv);
1017
1018         if (!strcmp(exec, "modinfo"))
1019                 return main_modinfo(argc, argv);
1020
1021         if (!strcmp(exec, "modprobe"))
1022                 return main_modprobe(argc, argv);
1023
1024         ulog_open(ULOG_KMSG, LOG_USER, "kmodloader");
1025         return main_loader(argc, argv);
1026 }