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
  52         int size;
  53         int usage;
  54         int state;
  55         int error;
  56         int refcnt;                     /* number of references from module_node.m */
  57 };
  58
  59 struct module_node {
  60         struct avl_node avl;
  61         struct module *m;
  62         bool is_alias;
  63 };
  64
  65 static struct avl_tree modules;
  66
  67 static char **module_folders = NULL;
  68
  69 static void free_module(struct module *m);
  70
  71 static int init_module_folders(void)
  72 {
  73         int n = 0;
  74         struct stat st;
  75         struct utsname ver;
  76         char *s, *e, *p, path[256], ldpath[256];
  77
  78         e = ldpath;
  79         s = getenv("LD_LIBRARY_PATH");
  80
  81         if (s)
  82                 e += snprintf(ldpath, sizeof(ldpath), "%s:", s);
  83
  84         e += snprintf(e, sizeof(ldpath) - (e - ldpath), "/lib");
  85
  86         uname(&ver);
  87
  88         for (s = p = ldpath; p <= e; p++) {
  89                 if (*p != ':' && *p != '\0')
  90                         continue;
  91
  92                 *p = 0;
  93                 snprintf(path, sizeof(path), "%s" DEF_MOD_PATH, s, ver.release);
  94
  95                 if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
  96                         module_folders = realloc(module_folders, sizeof(p) * (n + 2));
  97
  98                         if (!module_folders) {
  99                                 ULOG_ERR("out of memory\n");
 100                                 return -1;
 101                         }
 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[33];
 161         char *t;
 162
 163         strncpy(name, basename(path), sizeof(name) - 1);
 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         int endian = map[EI_DATA];
 220
 221 #if __BYTE_ORDER == __LITTLE_ENDIAN
 222         if (endian != ELFDATA2LSB)
 223 #elif __BYTE_ORDER == __BIG_ENDIAN
 224         if (endian != ELFDATA2MSB)
 225 #else
 226 #error "unsupported endian"
 227 #endif
 228         {
 229                 ULOG_ERR("invalid endianess: %d\n", endian);
 230                 return -1;
 231         }
 232
 233         if (clazz == ELFCLASS32)
 234                 return elf32_find_section(map, section, offset, size);
 235         else if (clazz == ELFCLASS64)
 236                 return elf64_find_section(map, section, offset, size);
 237
 238         ULOG_ERR("unknown elf format %d\n", clazz);
 239
 240         return -1;
 241 }
 242
 243 static struct module_node *
 244 alloc_module_node(const char *name, struct module *m, bool is_alias)
 245 {
 246         struct module_node *mn;
 247         char *_name;
 248
 249         mn = calloc_a(sizeof(*mn),
 250                 &_name, strlen(name) + 1);
 251         if (mn) {
 252                 mn->avl.key = strcpy(_name, name);
 253                 mn->m = m;
 254                 mn->is_alias = is_alias;
 255                 avl_insert(&modules, &mn->avl);
 256                 m->refcnt += 1;
 257         }
 258         return mn;
 259 }
 260
 261 static struct module *
 262 alloc_module(const char *name, const char * const *aliases, int naliases, const char *depends, int size)
 263 {
 264         struct module *m;
 265         char *_name, *_dep;
 266         int i;
 267
 268         m = calloc_a(sizeof(*m),
 269                 &_name, strlen(name) + 1,
 270                 &_dep, depends ? strlen(depends) + 2 : 0);
 271         if (!m)
 272                 return NULL;
 273
 274         m->name = strcpy(_name, name);
 275         m->opts = 0;
 276
 277         if (depends) {
 278                 m->depends = strcpy(_dep, depends);
 279                 while (*_dep) {
 280                         if (*_dep == ',')
 281                                 *_dep = '\0';
 282                         _dep++;
 283                 }
 284         }
 285         m->size = size;
 286
 287         m->refcnt = 0;
 288         alloc_module_node(m->name, m, false);
 289         for (i = 0; i < naliases; i++)
 290                 alloc_module_node(aliases[i], m, true);
 291
 292         return m;
 293 }
 294
 295 static void free_module(struct module *m)
 296 {
 297         if (m->opts)
 298                 free(m->opts);
 299         free(m);
 300 }
 301
 302 static int scan_loaded_modules(void)
 303 {
 304         size_t buf_len = 0;
 305         char *buf = NULL;
 306         FILE *fp;
 307
 308         fp = fopen("/proc/modules", "r");
 309         if (!fp) {
 310                 ULOG_ERR("failed to open /proc/modules\n");
 311                 return -1;
 312         }
 313
 314         while (getline(&buf, &buf_len, fp) > 0) {
 315                 struct module m;
 316                 struct module *n;
 317
 318                 m.name = strtok(buf, " ");
 319                 m.size = atoi(strtok(NULL, " "));
 320                 m.usage = atoi(strtok(NULL, " "));
 321                 m.depends = strtok(NULL, " ");
 322
 323                 if (!m.name || !m.depends)
 324                         continue;
 325
 326                 n = find_module(m.name);
 327                 if (!n) {
 328                         /* possibly a module outside /lib/modules/<ver>/ */
 329                         n = alloc_module(m.name, NULL, 0, m.depends, m.size);
 330                 }
 331                 n->usage = m.usage;
 332                 n->state = LOADED;
 333         }
 334         free(buf);
 335         fclose(fp);
 336
 337         return 0;
 338 }
 339
 340 static struct module* get_module_info(const char *module, const char *name)
 341 {
 342         int fd = open(module, O_RDONLY);
 343         unsigned int offset, size;
 344         char *map = MAP_FAILED, *strings, *dep = NULL;
 345         const char **aliases = NULL;
 346         int naliases = 0;
 347         struct module *m = NULL;
 348         struct stat s;
 349
 350         if (fd < 0) {
 351                 ULOG_ERR("failed to open %s\n", module);
 352                 goto out;
 353         }
 354
 355         if (fstat(fd, &s) == -1) {
 356                 ULOG_ERR("failed to stat %s\n", module);
 357                 goto out;
 358         }
 359
 360         map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 361         if (map == MAP_FAILED) {
 362                 ULOG_ERR("failed to mmap %s\n", module);
 363                 goto out;
 364         }
 365
 366         if (elf_find_section(map, ".modinfo", &offset, &size)) {
 367                 ULOG_ERR("failed to load the .modinfo section from %s\n", module);
 368                 goto out;
 369         }
 370
 371         strings = map + offset;
 372         while (true) {
 373                 char *sep;
 374                 int len;
 375
 376                 while (!strings[0])
 377                         strings++;
 378                 if (strings >= map + offset + size)
 379                         break;
 380                 sep = strstr(strings, "=");
 381                 if (!sep)
 382                         break;
 383                 len = sep - strings;
 384                 sep++;
 385                 if (!strncmp(strings, "depends=", len + 1))
 386                         dep = sep;
 387                 else if (!strncmp(strings, "alias=", len + 1)) {
 388                         aliases = realloc(aliases, sizeof(sep) * (naliases + 1));
 389                         if (!aliases) {
 390                                 ULOG_ERR("out of memory\n");
 391                                 goto out;
 392                         }
 393
 394                         aliases[naliases++] = sep;
 395                 }
 396                 strings = &sep[strlen(sep)];
 397         }
 398
 399         m = alloc_module(name, aliases, naliases, dep, s.st_size);
 400
 401         if (m)
 402                 m->state = SCANNED;
 403
 404 out:
 405         if (map != MAP_FAILED)
 406                 munmap(map, s.st_size);
 407
 408         if (fd >= 0)
 409                 close(fd);
 410
 411         free(aliases);
 412
 413         return m;
 414 }
 415
 416 static int scan_module_folder(const char *dir)
 417 {
 418         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 419         struct utsname ver;
 420         char *path;
 421         glob_t gl;
 422         int j, rv = 0;
 423
 424         uname(&ver);
 425         path = alloca(strlen(dir) + sizeof("*.ko") + 1);
 426         sprintf(path, "%s*.ko", dir);
 427
 428         if (glob(path, gl_flags, NULL, &gl) < 0)
 429                 return -1;
 430
 431         for (j = 0; j < gl.gl_pathc; j++) {
 432                 char *name = get_module_name(gl.gl_pathv[j]);
 433                 struct module *m;
 434
 435                 if (!name)
 436                         continue;
 437
 438                 m = find_module(name);
 439                 if (!m) {
 440                         if (!get_module_info(gl.gl_pathv[j], name))
 441                                 rv |= -1;
 442                 }
 443         }
 444
 445         globfree(&gl);
 446
 447         return rv;
 448 }
 449
 450 static int scan_module_folders(void)
 451 {
 452         int rv = 0;
 453         char **p;
 454
 455         if (init_module_folders())
 456                 return -1;
 457
 458         for (p = module_folders; *p; p++)
 459                 rv |= scan_module_folder(*p);
 460
 461         return rv;
 462 }
 463
 464 static int print_modinfo(char *module)
 465 {
 466         int fd = open(module, O_RDONLY);
 467         unsigned int offset, size;
 468         struct stat s;
 469         char *map = MAP_FAILED, *strings;
 470         int rv = -1;
 471
 472         if (fd < 0) {
 473                 ULOG_ERR("failed to open %s\n", module);
 474                 goto out;
 475         }
 476
 477         if (fstat(fd, &s) == -1) {
 478                 ULOG_ERR("failed to stat %s\n", module);
 479                 goto out;
 480         }
 481
 482         map = mmap(NULL, s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 483         if (map == MAP_FAILED) {
 484                 ULOG_ERR("failed to mmap %s\n", module);
 485                 goto out;
 486         }
 487
 488         if (elf_find_section(map, ".modinfo", &offset, &size)) {
 489                 ULOG_ERR("failed to load the .modinfo section from %s\n", module);
 490                 goto out;
 491         }
 492
 493         strings = map + offset;
 494         printf("module:\t\t%s\n", module);
 495         while (true) {
 496                 char *dup = NULL;
 497                 char *sep;
 498
 499                 while (!strings[0])
 500                         strings++;
 501                 if (strings >= map + offset + size)
 502                         break;
 503                 sep = strstr(strings, "=");
 504                 if (!sep)
 505                         break;
 506                 dup = strndup(strings, sep - strings);
 507                 sep++;
 508                 if (strncmp(strings, "parm", 4)) {
 509                         if (strlen(dup) < 7)
 510                                 printf("%s:\t\t%s\n",  dup, sep);
 511                         else
 512                                 printf("%s:\t%s\n",  dup, sep);
 513                 }
 514                 strings = &sep[strlen(sep)];
 515                 if (dup)
 516                         free(dup);
 517         }
 518
 519         rv = 0;
 520
 521 out:
 522         if (map != MAP_FAILED)
 523                 munmap(map, s.st_size);
 524
 525         if (fd >= 0)
 526                 close(fd);
 527
 528         return rv;
 529 }
 530
 531 static int deps_available(struct module *m, int verbose)
 532 {
 533         char *dep;
 534         int err = 0;
 535
 536         if (!m->depends || !strcmp(m->depends, "-") || !strcmp(m->depends, ""))
 537                 return 0;
 538
 539         dep = m->depends;
 540
 541         while (*dep) {
 542                 m = find_module(dep);
 543
 544                 if (verbose && !m)
 545                         ULOG_ERR("missing dependency %s\n", dep);
 546                 if (verbose && m && (m->state != LOADED))
 547                         ULOG_ERR("dependency not loaded %s\n", dep);
 548                 if (!m || (m->state != LOADED))
 549                         err++;
 550                 dep += strlen(dep) + 1;
 551         }
 552
 553         return err;
 554 }
 555
 556 static int insert_module(char *path, const char *options)
 557 {
 558         void *data = 0;
 559         struct stat s;
 560         int fd, ret = -1;
 561
 562         if (stat(path, &s)) {
 563                 ULOG_ERR("missing module %s\n", path);
 564                 return ret;
 565         }
 566
 567         fd = open(path, O_RDONLY);
 568         if (fd < 0) {
 569                 ULOG_ERR("cannot open %s\n", path);
 570                 return ret;
 571         }
 572
 573         data = malloc(s.st_size);
 574         if (!data) {
 575                 ULOG_ERR("out of memory\n");
 576                 goto out;
 577         }
 578
 579         if (read(fd, data, s.st_size) == s.st_size) {
 580                 ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
 581                 if (errno == EEXIST)
 582                         ret = 0;
 583         }
 584         else
 585                 ULOG_ERR("failed to read full module %s\n", path);
 586
 587 out:
 588         close(fd);
 589         free(data);
 590
 591         return ret;
 592 }
 593
 594 static void load_moddeps(struct module *_m)
 595 {
 596         char *dep;
 597         struct module *m;
 598
 599         if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
 600                 return;
 601
 602         dep = _m->depends;
 603
 604         while (*dep) {
 605                 m = find_module(dep);
 606
 607                 if (!m)
 608                         ULOG_ERR("failed to find dependency %s\n", dep);
 609                 if (m && (m->state != LOADED)) {
 610                         m->state = PROBE;
 611                         load_moddeps(m);
 612                 }
 613
 614                 dep = dep + strlen(dep) + 1;
 615         }
 616 }
 617
 618 static int iterations = 0;
 619 static int load_modprobe(void)
 620 {
 621         int loaded, todo;
 622         struct module_node *mn;
 623         struct module *m;
 624
 625         avl_for_each_element(&modules, mn, avl) {
 626                 if (mn->is_alias)
 627                         continue;
 628                 m = mn->m;
 629                 if (m->state == PROBE)
 630                         load_moddeps(m);
 631         }
 632
 633         do {
 634                 loaded = 0;
 635                 todo = 0;
 636                 avl_for_each_element(&modules, mn, avl) {
 637                         if (mn->is_alias)
 638                                 continue;
 639                         m = mn->m;
 640                         if ((m->state == PROBE) && (!deps_available(m, 0))) {
 641                                 if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
 642                                         m->state = LOADED;
 643                                         m->error = 0;
 644                                         loaded++;
 645                                         continue;
 646                                 }
 647                                 m->error = 1;
 648                         }
 649
 650                         if ((m->state == PROBE) || m->error)
 651                                 todo++;
 652                 }
 653                 iterations++;
 654         } while (loaded);
 655
 656         return todo;
 657 }
 658
 659 static int print_insmod_usage(void)
 660 {
 661         ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
 662
 663         return -1;
 664 }
 665
 666 static int print_modprobe_usage(void)
 667 {
 668         ULOG_INFO("Usage:\n\tmodprobe [-q] filename\n");
 669
 670         return -1;
 671 }
 672
 673 static int print_usage(char *arg)
 674 {
 675         ULOG_INFO("Usage:\n\t%s module\n", arg);
 676
 677         return -1;
 678 }
 679
 680 static int main_insmod(int argc, char **argv)
 681 {
 682         char *name, *cur, *options;
 683         int i, ret, len;
 684
 685         if (argc < 2)
 686                 return print_insmod_usage();
 687
 688         name = get_module_name(argv[1]);
 689         if (!name) {
 690                 ULOG_ERR("cannot find module - %s\n", argv[1]);
 691                 return -1;
 692         }
 693
 694         if (scan_loaded_modules())
 695                 return -1;
 696
 697         if (find_module(name)) {
 698                 ULOG_ERR("module is already loaded - %s\n", name);
 699                 return -1;
 700
 701         }
 702
 703         free_modules();
 704
 705         for (len = 0, i = 2; i < argc; i++)
 706                 len += strlen(argv[i]) + 1;
 707
 708         options = malloc(len);
 709         if (!options) {
 710                 ULOG_ERR("out of memory\n");
 711                 ret = -1;
 712                 goto err;
 713         }
 714
 715         options[0] = 0;
 716         cur = options;
 717         for (i = 2; i < argc; i++) {
 718                 if (options[0]) {
 719                         *cur = ' ';
 720                         cur++;
 721                 }
 722                 cur += sprintf(cur, "%s", argv[i]);
 723         }
 724
 725         if (init_module_folders()) {
 726                 fprintf(stderr, "Failed to find the folder holding the modules\n");
 727                 ret = -1;
 728                 goto err;
 729         }
 730
 731         if (get_module_path(argv[1])) {
 732                 name = argv[1];
 733         } else if (!get_module_path(name)) {
 734                 fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
 735                 ret = -1;
 736                 goto err;
 737         }
 738
 739         ret = insert_module(get_module_path(name), options);
 740         if (ret)
 741                 ULOG_ERR("failed to insert %s\n", get_module_path(name));
 742
 743 err:
 744         free(options);
 745         return ret;
 746 }
 747
 748 static int main_rmmod(int argc, char **argv)
 749 {
 750         struct module *m;
 751         char *name;
 752         int ret;
 753
 754         if (argc != 2)
 755                 return print_usage("rmmod");
 756
 757         if (scan_loaded_modules())
 758                 return -1;
 759
 760         name = get_module_name(argv[1]);
 761         m = find_module(name);
 762         if (!m) {
 763                 ULOG_ERR("module is not loaded\n");
 764                 return -1;
 765         }
 766         ret = syscall(__NR_delete_module, m->name, 0);
 767
 768         if (ret)
 769                 ULOG_ERR("unloading the module failed\n");
 770
 771         free_modules();
 772
 773         return ret;
 774 }
 775
 776 static int main_lsmod(int argc, char **argv)
 777 {
 778         struct module_node *mn;
 779         struct module *m;
 780         char *dep;
 781
 782         if (scan_loaded_modules())
 783                 return -1;
 784
 785         avl_for_each_element(&modules, mn, avl) {
 786                 if (mn->is_alias)
 787                         continue;
 788                 m = mn->m;
 789                 if (m->state == LOADED) {
 790                         printf("%-20s%8d%3d ",
 791                                 m->name, m->size, m->usage);
 792                         if (m->depends && strcmp(m->depends, "-") && strcmp(m->depends, "")) {
 793                                 dep = m->depends;
 794                                 while (*dep) {
 795                                         printf("%s", dep);
 796                                         dep = dep + strlen(dep) + 1;
 797                                         if (*dep)
 798                                                 printf(",");
 799                                 }
 800                         }
 801                         printf("\n");
 802                 }
 803         }
 804
 805         free_modules();
 806
 807         return 0;
 808 }
 809
 810 static int main_modinfo(int argc, char **argv)
 811 {
 812         struct module *m;
 813         char *name;
 814
 815         if (argc != 2)
 816                 return print_usage("modinfo");
 817
 818         if (scan_module_folders())
 819                 return -1;
 820
 821         name = get_module_name(argv[1]);
 822         m = find_module(name);
 823         if (!m) {
 824                 ULOG_ERR("cannot find module - %s\n", argv[1]);
 825                 return -1;
 826         }
 827
 828         name = get_module_path(m->name);
 829         if (!name) {
 830                 ULOG_ERR("cannot find path of module - %s\n", m->name);
 831                 return -1;
 832         }
 833
 834         print_modinfo(name);
 835
 836         return 0;
 837 }
 838
 839 static int main_modprobe(int argc, char **argv)
 840 {
 841         struct module_node *mn;
 842         struct module *m;
 843         char *name;
 844         char *mod = NULL;
 845         int opt;
 846         bool quiet = false;
 847
 848         while ((opt = getopt(argc, argv, "q")) != -1 ) {
 849                 switch (opt) {
 850                         case 'q': /* shhhh! */
 851                                 quiet = true;
 852                                 break;
 853                         default: /* '?' */
 854                                 return print_modprobe_usage();
 855                                 break;
 856                         }
 857         }
 858
 859         if (optind >= argc)
 860                 return print_modprobe_usage(); /* expected module after options */
 861
 862         mod = argv[optind];
 863
 864         if (scan_module_folders())
 865                 return -1;
 866
 867         if (scan_loaded_modules())
 868                 return -1;
 869
 870         name = get_module_name(mod);
 871         m = find_module(name);
 872         if (m && m->state == LOADED) {
 873                 if (!quiet)
 874                         ULOG_ERR("%s is already loaded\n", name);
 875                 return 0;
 876         } else if (!m) {
 877                 if (!quiet)
 878                         ULOG_ERR("failed to find a module named %s\n", name);
 879                 return -1;
 880         } else {
 881                 int fail;
 882
 883                 m->state = PROBE;
 884
 885                 fail = load_modprobe();
 886
 887                 if (fail) {
 888                         ULOG_ERR("%d module%s could not be probed\n",
 889                                  fail, (fail == 1) ? ("") : ("s"));
 890
 891                         avl_for_each_element(&modules, mn, avl) {
 892                                 if (mn->is_alias)
 893                                         continue;
 894                                 m = mn->m;
 895                                 if ((m->state == PROBE) || m->error)
 896                                         ULOG_ERR("- %s\n", m->name);
 897                         }
 898                 }
 899         }
 900
 901         free_modules();
 902
 903         return 0;
 904 }
 905
 906 static int main_loader(int argc, char **argv)
 907 {
 908         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 909         char *dir = "/etc/modules.d/";
 910         struct module_node *mn;
 911         struct module *m;
 912         glob_t gl;
 913         char *path;
 914         int fail, j;
 915
 916         if (argc > 1)
 917                 dir = argv[1];
 918
 919         path = malloc(strlen(dir) + 2);
 920         if (!path) {
 921                 ULOG_ERR("out of memory\n");
 922                 return -1;
 923         }
 924
 925         strcpy(path, dir);
 926         strcat(path, "*");
 927
 928         if (scan_module_folders()) {
 929                 free (path);
 930                 return -1;
 931         }
 932
 933         if (scan_loaded_modules()) {
 934                 free (path);
 935                 return -1;
 936         }
 937
 938         ULOG_INFO("loading kernel modules from %s\n", path);
 939
 940         if (glob(path, gl_flags, NULL, &gl) < 0)
 941                 goto out;
 942
 943         for (j = 0; j < gl.gl_pathc; j++) {
 944                 FILE *fp = fopen(gl.gl_pathv[j], "r");
 945                 size_t mod_len = 0;
 946                 char *mod = NULL;
 947
 948                 if (!fp) {
 949                         ULOG_ERR("failed to open %s\n", gl.gl_pathv[j]);
 950                         continue;
 951                 }
 952
 953                 while (getline(&mod, &mod_len, fp) > 0) {
 954                         char *nl = strchr(mod, '\n');
 955                         struct module *m;
 956                         char *opts;
 957
 958                         if (nl)
 959                                 *nl = '\0';
 960
 961                         opts = strchr(mod, ' ');
 962                         if (opts)
 963                                 *opts++ = '\0';
 964
 965                         m = find_module(get_module_name(mod));
 966                         if (!m || (m->state == LOADED))
 967                                 continue;
 968
 969                         if (opts)
 970                                 m->opts = strdup(opts);
 971                         m->state = PROBE;
 972                         if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
 973                                 load_modprobe();
 974
 975                 }
 976                 free(mod);
 977                 fclose(fp);
 978         }
 979
 980         fail = load_modprobe();
 981
 982         if (fail) {
 983                 ULOG_ERR("%d module%s could not be probed\n",
 984                          fail, (fail == 1) ? ("") : ("s"));
 985
 986                 avl_for_each_element(&modules, mn, avl) {
 987                         if (mn->is_alias)
 988                                 continue;
 989                         m = mn->m;
 990                         if ((m->state == PROBE) || (m->error))
 991                                 ULOG_ERR("- %s - %d\n", m->name, deps_available(m, 1));
 992                 }
 993         } else {
 994                 ULOG_INFO("done loading kernel modules from %s\n", path);
 995         }
 996
 997 out:
 998         globfree(&gl);
 999         free(path);
1000
1001         return 0;
1002 }
1003
1004 static inline char weight(char c)
1005 {
1006         return c == '_' ? '-' : c;
1007 }
1008
1009 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
1010 {
1011         const char *s1 = k1;
1012         const char *s2 = k2;
1013
1014         while (*s1 && (weight(*s1) == weight(*s2)))
1015         {
1016                 s1++;
1017                 s2++;
1018         }
1019
1020         return (unsigned char)weight(*s1) - (unsigned char)weight(*s2);
1021 }
1022
1023 int main(int argc, char **argv)
1024 {
1025         char *exec = basename(*argv);
1026
1027         avl_init(&modules, avl_modcmp, false, NULL);
1028         if (!strcmp(exec, "insmod"))
1029                 return main_insmod(argc, argv);
1030
1031         if (!strcmp(exec, "rmmod"))
1032                 return main_rmmod(argc, argv);
1033
1034         if (!strcmp(exec, "lsmod"))
1035                 return main_lsmod(argc, argv);
1036
1037         if (!strcmp(exec, "modinfo"))
1038                 return main_modinfo(argc, argv);
1039
1040         if (!strcmp(exec, "modprobe"))
1041                 return main_modprobe(argc, argv);
1042
1043         ulog_open(ULOG_KMSG, LOG_USER, "kmodloader");
1044         return main_loader(argc, argv);
1045 }