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 #include <ctype.h>
  34
  35 #include <libubox/avl.h>
  36 #include <libubox/avl-cmp.h>
  37 #include <libubox/utils.h>
  38 #include <libubox/ulog.h>
  39 #include <libubox/kvlist.h>
  40 #include <libubox/list.h>
  41
  42 #define DEF_MOD_PATH "/modules/%s/"
  43 #define MOD_BUILTIN "modules.builtin"
  44 #define MOD_BUILTIN_MODINFO "modules.builtin.modinfo"
  45 /* duplicated from in-kernel include/linux/module.h */
  46 #define MODULE_NAME_LEN (64 - sizeof(unsigned long))
  47
  48 struct param {
  49         char *name;
  50         char *desc;
  51         char *type;
  52         struct list_head list;
  53 };
  54
  55 enum {
  56         BUILTIN,
  57         SCANNED,
  58         PROBE,
  59         LOADED,
  60         BLACKLISTED,
  61 };
  62
  63 struct module {
  64         char *name;
  65         char *depends;
  66         char *opts;
  67
  68         int size;
  69         int usage;
  70         int state;
  71         int error;
  72         int refcnt;                     /* number of references from module_node.m */
  73 };
  74
  75 struct module_node {
  76         struct avl_node avl;
  77         struct module *m;
  78         bool is_alias;
  79 };
  80
  81 static struct avl_tree modules;
  82 static KVLIST(options, kvlist_strlen);
  83
  84 static char **module_folders = NULL;
  85
  86 static void free_module(struct module *m);
  87
  88 static int init_module_folders(void)
  89 {
  90         int n = 0;
  91         struct stat st;
  92         struct utsname ver;
  93         char *s, *e, *p, path[330], ldpath[256];
  94
  95         e = ldpath;
  96         s = getenv("LD_LIBRARY_PATH");
  97
  98         if (s)
  99                 e += snprintf(ldpath, sizeof(ldpath), "%s:", s);
 100
 101         e += snprintf(e, sizeof(ldpath) - (e - ldpath), "/lib");
 102
 103         uname(&ver);
 104
 105         for (s = p = ldpath; p <= e; p++) {
 106                 if (*p != ':' && *p != '\0')
 107                         continue;
 108
 109                 *p = 0;
 110                 snprintf(path, sizeof(path), "%s" DEF_MOD_PATH, s, ver.release);
 111
 112                 if (!stat(path, &st) && S_ISDIR(st.st_mode)) {
 113                         module_folders = realloc(module_folders, sizeof(p) * (n + 2));
 114
 115                         if (!module_folders) {
 116                                 ULOG_ERR("out of memory\n");
 117                                 return -1;
 118                         }
 119
 120                         module_folders[n++] = strdup(path);
 121                 }
 122
 123                 s = p + 1;
 124         }
 125
 126         if (!module_folders) {
 127                 ULOG_ERR("no module folders for kernel version %s found\n", ver.release);
 128                 return -1;
 129         }
 130
 131         module_folders[n] = NULL;
 132         return 0;
 133 }
 134
 135 static void free_module_folders(void)
 136 {
 137         int n = 0;
 138
 139         if (!module_folders)
 140                 return;
 141         while (module_folders[n])
 142                 free(module_folders[n++]);
 143         free(module_folders);
 144 }
 145
 146 static struct module *find_module(const char *name)
 147 {
 148         struct module_node *mn;
 149         mn = avl_find_element(&modules, name, mn, avl);
 150         if (mn)
 151                 return mn->m;
 152         else
 153                 return NULL;
 154 }
 155
 156 static void free_modules(void)
 157 {
 158         struct module_node *mn, *tmp;
 159
 160         avl_remove_all_elements(&modules, mn, avl, tmp) {
 161                 struct module *m = mn->m;
 162
 163                 m->refcnt -= 1;
 164                 if (m->refcnt == 0)
 165                         free_module(m);
 166                 free(mn);
 167         }
 168 }
 169
 170 static char* get_module_path(char *name)
 171 {
 172         char **p;
 173         static char path[256];
 174         struct stat s;
 175
 176         if (!stat(name, &s) && S_ISREG(s.st_mode))
 177                 return name;
 178
 179         for (p = module_folders; *p; p++) {
 180                 snprintf(path, sizeof(path), "%s%s.ko", *p, name);
 181                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 182                         return path;
 183         }
 184
 185         return NULL;
 186 }
 187
 188 static char* get_module_name(char *path)
 189 {
 190         static char name[MODULE_NAME_LEN];
 191         char *t;
 192
 193         strncpy(name, basename(path), sizeof(name) - 1);
 194
 195         t = strstr(name, ".ko");
 196         if (t)
 197                 *t = '\0';
 198
 199         return name;
 200 }
 201
 202 static int elf64_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 203 {
 204         const char *secnames;
 205         Elf64_Ehdr *e;
 206         Elf64_Shdr *sh;
 207         int i;
 208
 209         e = (Elf64_Ehdr *) map;
 210         sh = (Elf64_Shdr *) (map + e->e_shoff);
 211
 212         secnames = map + sh[e->e_shstrndx].sh_offset;
 213         for (i = 0; i < e->e_shnum; i++) {
 214                 if (!strcmp(section, secnames + sh[i].sh_name)) {
 215                         *size = sh[i].sh_size;
 216                         *offset = sh[i].sh_offset;
 217                         return 0;
 218                 }
 219         }
 220
 221         return -1;
 222 }
 223
 224 static int elf32_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 225 {
 226         const char *secnames;
 227         Elf32_Ehdr *e;
 228         Elf32_Shdr *sh;
 229         int i;
 230
 231         e = (Elf32_Ehdr *) map;
 232         sh = (Elf32_Shdr *) (map + e->e_shoff);
 233
 234         secnames = map + sh[e->e_shstrndx].sh_offset;
 235         for (i = 0; i < e->e_shnum; i++) {
 236                 if (!strcmp(section, secnames + sh[i].sh_name)) {
 237                         *size = sh[i].sh_size;
 238                         *offset = sh[i].sh_offset;
 239                         return 0;
 240                 }
 241         }
 242
 243         return -1;
 244 }
 245
 246 static int elf_find_section(char *map, const char *section, unsigned int *offset, unsigned int *size)
 247 {
 248         int clazz = map[EI_CLASS];
 249         int endian = map[EI_DATA];
 250
 251 #if __BYTE_ORDER == __LITTLE_ENDIAN
 252         if (endian != ELFDATA2LSB)
 253 #elif __BYTE_ORDER == __BIG_ENDIAN
 254         if (endian != ELFDATA2MSB)
 255 #else
 256 #error "unsupported endian"
 257 #endif
 258         {
 259                 ULOG_ERR("invalid endianess: %d\n", endian);
 260                 return -1;
 261         }
 262
 263         if (clazz == ELFCLASS32)
 264                 return elf32_find_section(map, section, offset, size);
 265         else if (clazz == ELFCLASS64)
 266                 return elf64_find_section(map, section, offset, size);
 267
 268         ULOG_ERR("unknown elf format %d\n", clazz);
 269
 270         return -1;
 271 }
 272
 273 static struct module_node *
 274 alloc_module_node(const char *name, struct module *m, bool is_alias)
 275 {
 276         struct module_node *mn;
 277         char *_name;
 278
 279         mn = calloc_a(sizeof(*mn),
 280                 &_name, strlen(name) + 1);
 281         if (mn) {
 282                 mn->avl.key = strcpy(_name, name);
 283                 mn->m = m;
 284                 mn->is_alias = is_alias;
 285                 if (avl_insert(&modules, &mn->avl) == 0)
 286                         m->refcnt += 1;
 287                 else
 288                         free(mn);
 289         }
 290         return mn;
 291 }
 292
 293 static int avl_modcmp(const void *k1, const void *k2, void *ptr);
 294
 295 static struct module *
 296 alloc_module(const char *name, const char * const *aliases, int naliases, const char *depends, int size)
 297 {
 298         struct module *m;
 299         char *_name, *_dep;
 300         int i;
 301
 302         m = calloc_a(sizeof(*m),
 303                 &_name, strlen(name) + 1,
 304                 &_dep, depends ? strlen(depends) + 2 : 0);
 305         if (!m)
 306                 return NULL;
 307
 308         m->name = strcpy(_name, name);
 309         m->opts = 0;
 310
 311         if (depends) {
 312                 m->depends = strcpy(_dep, depends);
 313                 while (*_dep) {
 314                         if (*_dep == ',')
 315                                 *_dep = '\0';
 316                         _dep++;
 317                 }
 318         }
 319         m->size = size;
 320
 321         m->refcnt = 0;
 322         alloc_module_node(m->name, m, false);
 323         for (i = 0; i < naliases; i++)
 324                 if (avl_modcmp(m->name, aliases[i], NULL))
 325                         alloc_module_node(aliases[i], m, true);
 326
 327         return m;
 328 }
 329
 330 static void free_module(struct module *m)
 331 {
 332         if (m->opts)
 333                 free(m->opts);
 334         free(m);
 335 }
 336
 337 static int scan_loaded_modules(void)
 338 {
 339         size_t buf_len = 0;
 340         char *buf = NULL;
 341         int rv = -1;
 342         FILE *fp;
 343
 344         fp = fopen("/proc/modules", "r");
 345         if (!fp) {
 346                 ULOG_ERR("failed to open /proc/modules\n");
 347                 return -1;
 348         }
 349
 350         while (getline(&buf, &buf_len, fp) > 0) {
 351                 struct module m;
 352                 struct module *n;
 353
 354                 m.name = strtok(buf, " ");
 355                 m.size = atoi(strtok(NULL, " "));
 356                 m.usage = atoi(strtok(NULL, " "));
 357                 m.depends = strtok(NULL, " ");
 358
 359                 if (!m.name || !m.depends)
 360                         continue;
 361
 362                 n = find_module(m.name);
 363                 if (!n) {
 364                         /* possibly a module outside /lib/modules/<ver>/ */
 365                         n = alloc_module(m.name, NULL, 0, m.depends, m.size);
 366                 }
 367                 if (!n) {
 368                         ULOG_ERR("Failed to allocate memory for module\n");
 369                         goto out;
 370                 }
 371
 372                 n->usage = m.usage;
 373                 n->state = LOADED;
 374         }
 375         rv = 0;
 376 out:
 377         free(buf);
 378         fclose(fp);
 379
 380         return rv;
 381 }
 382
 383 static char *mmap_modinfo(const char *module, const char *name, struct stat *s, unsigned int *offset, unsigned int *size)
 384 {
 385         const bool is_builtin = (module == NULL);
 386         const char *mpath = NULL;
 387         char *map = MAP_FAILED;
 388         char path[350], **f;
 389         int fd = -1;
 390
 391         if (is_builtin)
 392                 for (f = module_folders; *f; f++) {
 393                         snprintf(path, sizeof(path), "%s%s", *f, MOD_BUILTIN_MODINFO);
 394                         if (!stat(path, s) && S_ISREG(s->st_mode)) {
 395                                 mpath = path;
 396                                 break;
 397                         }
 398                 }
 399         else
 400                 mpath = module;
 401
 402         if (!mpath) {
 403                 ULOG_ERR("cannot find modinfo path of module - %s\n", name);
 404                 goto out;
 405         }
 406
 407         fd = open(mpath, O_RDONLY);
 408         if (fd < 0) {
 409                 ULOG_ERR("failed to open %s\n", mpath);
 410                 goto out;
 411         }
 412
 413         if (fstat(fd, s) == -1) {
 414                 ULOG_ERR("failed to stat %s\n", mpath);
 415                 goto out;
 416         }
 417
 418         map = mmap(NULL, s->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
 419         if (map == MAP_FAILED) {
 420                 ULOG_ERR("failed to mmap %s\n", mpath);
 421                 goto out;
 422         }
 423
 424         if (is_builtin) {
 425                 *offset = 0;
 426                 *size = s->st_size;
 427         } else if (elf_find_section(map, ".modinfo", offset, size)) {
 428                 ULOG_ERR("failed to load the .modinfo section from %s\n", mpath);
 429                 munmap(map, s->st_size);
 430                 map = MAP_FAILED;
 431         }
 432
 433 out:
 434         if (fd >= 0)
 435                 close(fd);
 436         return map;
 437 }
 438
 439 static struct module* get_module_info(const char *module, const char *name)
 440 {
 441         const bool is_builtin = (module == NULL);
 442         unsigned int offset, size;
 443         char *map, *strings, *dep = NULL;
 444         const char **aliases = NULL;
 445         const char **aliasesr;
 446         int naliases = 0;
 447         struct module *m = NULL;
 448         struct stat s;
 449
 450         map = mmap_modinfo(module, name, &s, &offset, &size);
 451         if (map == MAP_FAILED)
 452                 goto out;
 453
 454         strings = map + offset;
 455         while (true) {
 456                 char *end = map + offset + size;
 457                 char *sep;
 458                 int len;
 459
 460                 while ((strings < end) && !strings[0])
 461                         strings++;
 462                 if (strings >= end)
 463                         break;
 464                 if (is_builtin) {
 465                         sep = strstr(strings, ".");
 466                         if (!sep)
 467                                 break;
 468                         if (strlen(name) == (sep - strings) &&
 469                             !strncmp(strings, name, sep - strings))
 470                                 strings = sep + 1;
 471                         else
 472                                 goto next_string;
 473                 }
 474                 sep = strstr(strings, "=");
 475                 if (!sep)
 476                         break;
 477                 len = sep - strings;
 478                 sep++;
 479                 if (!strncmp(strings, "depends=", len + 1))
 480                         dep = sep;
 481                 else if (!strncmp(strings, "alias=", len + 1)) {
 482                         aliasesr = realloc(aliases, sizeof(sep) * (naliases + 1));
 483                         if (!aliasesr) {
 484                                 ULOG_ERR("out of memory\n");
 485                                 goto out;
 486                         }
 487
 488                         aliases = aliasesr;
 489                         aliases[naliases++] = sep;
 490                 }
 491 next_string:
 492                 strings = &sep[strlen(sep)];
 493         }
 494
 495         m = alloc_module(name, aliases, naliases, dep, is_builtin ? 0 : s.st_size);
 496
 497         if (m)
 498                 m->state = is_builtin ? BUILTIN : SCANNED;
 499
 500 out:
 501         if (map != MAP_FAILED)
 502                 munmap(map, s.st_size);
 503
 504         free(aliases);
 505
 506         return m;
 507 }
 508
 509 static int scan_builtin_modules(void)
 510 {
 511         char **p, path[350];
 512         size_t buf_len = 0;
 513         char *buf = NULL;
 514         struct stat st;
 515         FILE *fp = NULL;
 516         int rv = -1;
 517
 518         if (!module_folders && init_module_folders())
 519                 return -1;
 520         for (p = module_folders; *p; p++) {
 521                 snprintf(path, sizeof(path), "%s%s", *p, MOD_BUILTIN);
 522                 fp = fopen(path, "r");
 523                 if (!fp)
 524                         continue;
 525
 526                 if (!fstat(fileno(fp), &st) && S_ISREG(st.st_mode))
 527                         break;
 528
 529                 /* Not regular file, close it and check next */
 530                 fclose(fp);
 531                 fp = NULL;
 532         }
 533         if (!fp)
 534                 return 0;       /* OK if modules.builtin unavailable */
 535
 536         while (getline(&buf, &buf_len, fp) > 0) {
 537                 struct module *m;
 538                 char *name;
 539
 540                 name = get_module_name(buf);
 541                 if (!name)
 542                         continue;
 543                 m = find_module(name);
 544                 if (m && !strcmp(m->name, name)) {
 545                         ULOG_WARN("found duplicate builtin module %s\n", name);
 546                         continue;
 547                 }
 548                 m = get_module_info(NULL, name);
 549                 if (!m) {
 550                         ULOG_ERR("failed to find info for builtin module %s\n", name);
 551                         goto err;
 552                 }
 553         }
 554
 555         rv = 0;
 556 err:
 557         free(buf);
 558         fclose(fp);
 559
 560         return rv;
 561 }
 562
 563 static int scan_module_folder(const char *dir)
 564 {
 565         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 566         char *path;
 567         glob_t gl;
 568         int j, rv = 0;
 569
 570         path = alloca(strlen(dir) + sizeof("*.ko") + 1);
 571         sprintf(path, "%s*.ko", dir);
 572
 573         if (glob(path, gl_flags, NULL, &gl) < 0)
 574                 return -1;
 575
 576         for (j = 0; j < gl.gl_pathc; j++) {
 577                 char *name = get_module_name(gl.gl_pathv[j]);
 578                 struct module *m;
 579                 char *opts;
 580
 581                 if (!name)
 582                         continue;
 583
 584                 m = find_module(name);
 585                 if (m)
 586                         continue;
 587
 588                 m = get_module_info(gl.gl_pathv[j], name);
 589                 if (!m) {
 590                         rv |= -1;
 591                         continue;
 592                 }
 593
 594                 opts = kvlist_get(&options, name);
 595                 if (!opts)
 596                         continue;
 597
 598                 if (*opts == '\x01')
 599                         m->state = BLACKLISTED;
 600                 else
 601                         m->opts = strdup(opts);
 602         }
 603
 604         globfree(&gl);
 605
 606         return rv;
 607 }
 608
 609 static int scan_module_folders(void)
 610 {
 611         int rv = 0;
 612         char **p;
 613
 614         if (init_module_folders())
 615                 return -1;
 616
 617         for (p = module_folders; *p; p++)
 618                 rv |= scan_module_folder(*p);
 619
 620         return rv;
 621 }
 622
 623 static int print_modinfo(const struct module *m)
 624 {
 625         const bool is_builtin = (m->state == BUILTIN);
 626         unsigned int offset, size;
 627         struct param *p;
 628         struct stat s;
 629         char *map, *strings, *mpath;
 630         int rv = -1;
 631
 632         LIST_HEAD(params);
 633
 634         mpath = get_module_path(m->name);
 635         map = mmap_modinfo(mpath, m->name, &s, &offset, &size);
 636         if (map == MAP_FAILED)
 637                 goto out;
 638
 639         strings = map + offset;
 640         if (is_builtin)
 641                 printf("name:\t\t%s\n", m->name);
 642         printf("filename:\t%s\n", is_builtin ? "(builtin)" : mpath);
 643         while (true) {
 644                 char *end = map + offset + size;
 645                 char *pname, *pdata;
 646                 char *dup = NULL;
 647                 char *sep, *sep2;
 648
 649                 while ((strings < end) && !strings[0])
 650                         strings++;
 651                 if (strings >= end)
 652                         break;
 653                 if (is_builtin) {
 654                         sep = strstr(strings, ".");
 655                         if (!sep)
 656                                 break;
 657                         if (strlen(m->name) == (sep - strings) &&
 658                             !strncmp(strings, m->name, sep - strings))
 659                                 strings = sep + 1;
 660                         else
 661                                 goto next_string;
 662                 }
 663                 sep = strstr(strings, "=");
 664                 if (!sep)
 665                         break;
 666                 dup = strndup(strings, sep - strings);
 667                 sep++;
 668                 if (strncmp(strings, "parm", 4)) {
 669                         if (strlen(dup) < 7)
 670                                 printf("%s:\t\t%s\n",  dup, sep);
 671                         else
 672                                 printf("%s:\t%s\n",  dup, sep);
 673                 } else {
 674                         sep2 = strstr(sep, ":");
 675                         if (!sep2) {
 676                                 free(dup);
 677                                 break;
 678                         }
 679
 680                         pname = strndup(sep, sep2 - sep);
 681                         sep2++;
 682                         pdata = strdup(sep2);
 683
 684                         list_for_each_entry(p, &params, list)
 685                                 if (!strcmp(pname, p->name))
 686                                         break;
 687
 688                         if (list_entry_is_h(p, &params, list)) {
 689                                 p = alloca(sizeof(*p));
 690                                 p->name = pname;
 691                                 p->desc = p->type = NULL;
 692                                 list_add(&p->list, &params);
 693                         } else {
 694                                 free(pname);
 695                         }
 696
 697                         if (!strcmp(dup, "parmtype"))
 698                                 p->type = pdata;
 699                         else
 700                                 p->desc = pdata;
 701                 }
 702
 703                 free(dup);
 704 next_string:
 705                 strings = &sep[strlen(sep)];
 706         }
 707
 708         list_for_each_entry(p, &params, list) {
 709                 printf("parm:\t\t%s",  p->name);
 710                 if (p->desc)
 711                         printf(":%s", p->desc);
 712                 if (p->type)
 713                         printf(" (%s)", p->type);
 714                 printf("\n");
 715                 free(p->name);
 716                 free(p->desc);
 717                 free(p->type);
 718         }
 719
 720         rv = 0;
 721
 722 out:
 723         if (map != MAP_FAILED)
 724                 munmap(map, s.st_size);
 725
 726         return rv;
 727 }
 728
 729 static int deps_available(struct module *m, int verbose)
 730 {
 731         char *dep;
 732         int err = 0;
 733
 734         if (!m->depends || !strcmp(m->depends, "-") || !strcmp(m->depends, ""))
 735                 return 0;
 736
 737         dep = m->depends;
 738
 739         while (*dep) {
 740                 m = find_module(dep);
 741
 742                 if (verbose && !m)
 743                         ULOG_ERR("missing dependency %s\n", dep);
 744                 if (verbose && m && (m->state != LOADED))
 745                         ULOG_ERR("dependency not loaded %s\n", dep);
 746                 if (!m || (m->state != LOADED))
 747                         err++;
 748                 dep += strlen(dep) + 1;
 749         }
 750
 751         return err;
 752 }
 753
 754 static int insert_module(char *path, const char *options)
 755 {
 756         void *data = 0;
 757         struct stat s;
 758         int fd, ret = -1;
 759
 760         if (!path) {
 761                 ULOG_ERR("Path not specified\n");
 762                 return ret;
 763         }
 764
 765         if (stat(path, &s)) {
 766                 ULOG_ERR("missing module %s\n", path);
 767                 return ret;
 768         }
 769
 770         fd = open(path, O_RDONLY);
 771         if (fd < 0) {
 772                 ULOG_ERR("cannot open %s\n", path);
 773                 return ret;
 774         }
 775
 776         data = malloc(s.st_size);
 777         if (!data) {
 778                 ULOG_ERR("out of memory\n");
 779                 goto out;
 780         }
 781
 782         if (read(fd, data, s.st_size) == s.st_size) {
 783                 ret = syscall(__NR_init_module, data, (unsigned long) s.st_size, options);
 784                 if (errno == EEXIST)
 785                         ret = 0;
 786         }
 787         else
 788                 ULOG_ERR("failed to read full module %s\n", path);
 789
 790 out:
 791         close(fd);
 792         free(data);
 793
 794         return ret;
 795 }
 796
 797 static void load_moddeps(struct module *_m)
 798 {
 799         char *dep;
 800         struct module *m;
 801
 802         if (!strcmp(_m->depends, "-") || !strcmp(_m->depends, ""))
 803                 return;
 804
 805         dep = _m->depends;
 806
 807         while (*dep) {
 808                 m = find_module(dep);
 809
 810                 if (!m)
 811                         ULOG_ERR("failed to find dependency %s\n", dep);
 812                 if (m && (m->state != LOADED)) {
 813                         m->state = PROBE;
 814                         load_moddeps(m);
 815                 }
 816
 817                 dep = dep + strlen(dep) + 1;
 818         }
 819 }
 820
 821 static int load_modprobe(bool allow_load_retry)
 822 {
 823         int loaded, skipped, failed;
 824         struct module_node *mn;
 825         struct module *m;
 826         bool load_retry = false;
 827         static bool first_iteration = true;
 828
 829         avl_for_each_element(&modules, mn, avl) {
 830                 if (mn->is_alias)
 831                         continue;
 832                 m = mn->m;
 833                 if (m->state == PROBE)
 834                         load_moddeps(m);
 835         }
 836
 837         do {
 838                 loaded = 0;
 839                 skipped = 0;
 840                 failed = 0;
 841                 avl_for_each_element(&modules, mn, avl) {
 842                         if (mn->is_alias)
 843                                 continue;
 844                         m = mn->m;
 845                         if ((m->state == PROBE) && (!deps_available(m, 0)) && (!m->error || load_retry)) {
 846                                 if (!insert_module(get_module_path(m->name), (m->opts) ? (m->opts) : (""))) {
 847                                         m->state = LOADED;
 848                                         m->error = 0;
 849                                         loaded++;
 850                                         continue;
 851                                 }
 852
 853                                 m->error = 1;
 854                         }
 855
 856                         if (m->error)
 857                                 failed++;
 858                         else if (m->state == PROBE)
 859                                 skipped++;
 860                 }
 861
 862                 if (allow_load_retry) {
 863                         /* if we can't load anything else let's try to load failed modules */
 864                         load_retry = loaded ? (failed && !skipped) : (failed && !load_retry && !first_iteration);
 865                 }
 866
 867                 first_iteration = false;
 868         } while (loaded || load_retry);
 869
 870         return skipped + failed;
 871 }
 872
 873 static int print_insmod_usage(void)
 874 {
 875         ULOG_INFO("Usage:\n\tinsmod filename [args]\n");
 876
 877         return -1;
 878 }
 879
 880 static int print_modprobe_usage(void)
 881 {
 882         ULOG_INFO(
 883                 "Usage:\n"
 884                 "\tmodprobe [-q] [-v] filename\n"
 885                 "\tmodprobe -a [-q] [-v] filename [filename...]\n"
 886         );
 887
 888         return -1;
 889 }
 890
 891 static int print_usage(char *arg)
 892 {
 893         ULOG_INFO("Usage:\n\t%s module\n", arg);
 894
 895         return -1;
 896 }
 897
 898 static int main_insmod(int argc, char **argv)
 899 {
 900         char *name, *path, *cur, *opts = NULL;
 901         int i, ret = -1, len;
 902
 903         if (argc < 2)
 904                 return print_insmod_usage();
 905
 906         name = get_module_name(argv[1]);
 907         if (!name) {
 908                 ULOG_ERR("cannot find module - %s\n", argv[1]);
 909                 return -1;
 910         }
 911
 912         if (scan_loaded_modules())
 913                 return -1;
 914
 915         if (find_module(name)) {
 916                 ULOG_ERR("module is already loaded - %s\n", name);
 917                 goto err;
 918
 919         }
 920
 921         for (len = 1, i = 2; i < argc; i++)
 922                 len += strlen(argv[i]) + 1;
 923
 924         opts = malloc(len);
 925         if (!opts) {
 926                 ULOG_ERR("out of memory\n");
 927                 goto err;
 928         }
 929
 930         opts[0] = 0;
 931         cur = opts;
 932         for (i = 2; i < argc; i++) {
 933                 if (opts[0]) {
 934                         *cur = ' ';
 935                         cur++;
 936                 }
 937                 cur += sprintf(cur, "%s", argv[i]);
 938         }
 939
 940         if (init_module_folders()) {
 941                 fprintf(stderr, "Failed to find the folder holding the modules\n");
 942                 goto err;
 943         }
 944
 945         if (!(path = get_module_path(argv[1])) ||
 946              (path = get_module_path(name))) {
 947                 fprintf(stderr, "Failed to find %s. Maybe it is a built in module ?\n", name);
 948                 goto err;
 949         }
 950
 951         ret = insert_module(path, opts);
 952         if (ret)
 953                 ULOG_ERR("failed to insert %s\n", get_module_path(name));
 954
 955 err:
 956         free(opts);
 957         free_modules();
 958         free_module_folders();
 959
 960         return ret;
 961 }
 962
 963 static int main_rmmod(int argc, char **argv)
 964 {
 965         struct module *m;
 966         char *name;
 967         int ret = -1;
 968
 969         if (argc != 2)
 970                 return print_usage("rmmod");
 971
 972         if (scan_loaded_modules())
 973                 return -1;
 974
 975         if (scan_builtin_modules())
 976                 return -1;
 977
 978         name = get_module_name(argv[1]);
 979         m = find_module(name);
 980         if (!m) {
 981                 ULOG_ERR("module is not loaded\n");
 982                 goto err;
 983         }
 984         if (m->state == BUILTIN) {
 985                 ULOG_ERR("module is builtin\n");
 986                 goto err;
 987         }
 988         ret = syscall(__NR_delete_module, m->name, 0);
 989
 990         if (ret)
 991                 ULOG_ERR("unloading the module failed\n");
 992
 993 err:
 994         free_modules();
 995         free_module_folders();
 996
 997         return ret;
 998 }
 999
1000 static int main_lsmod(int argc, char **argv)
1001 {
1002         struct module_node *mn;
1003         struct module *m;
1004         char *dep;
1005
1006         if (scan_loaded_modules())
1007                 return -1;
1008
1009         avl_for_each_element(&modules, mn, avl) {
1010                 if (mn->is_alias)
1011                         continue;
1012                 m = mn->m;
1013                 if (m->state == LOADED) {
1014                         printf("%-20s%8d%3d ",
1015                                 m->name, m->size, m->usage);
1016                         if (m->depends && strcmp(m->depends, "-") && strcmp(m->depends, "")) {
1017                                 dep = m->depends;
1018                                 while (*dep) {
1019                                         printf("%s", dep);
1020                                         dep = dep + strlen(dep) + 1;
1021                                         if (*dep)
1022                                                 printf(",");
1023                                 }
1024                         }
1025                         printf("\n");
1026                 }
1027         }
1028
1029         free_modules();
1030
1031         return 0;
1032 }
1033
1034 static int main_modinfo(int argc, char **argv)
1035 {
1036         struct module_node *mn;
1037         int rv = -1;
1038         char *name;
1039
1040         if (argc != 2)
1041                 return print_usage("modinfo");
1042
1043         if (scan_module_folders())
1044                 return -1;
1045
1046         if (scan_builtin_modules())
1047                 return -1;
1048
1049         name = get_module_name(argv[1]);
1050         mn = avl_find_element(&modules, name, mn, avl);
1051         if (!mn) {
1052                 ULOG_ERR("cannot find module - %s\n", argv[1]);
1053                 goto err;
1054         }
1055
1056         if (!mn->avl.leader)
1057                 print_modinfo(mn->m);
1058         else
1059                 do {
1060                         print_modinfo(mn->m);
1061                         mn = (struct module_node *) mn->avl.list.next;
1062                 } while (!avl_modcmp(name, mn->avl.key, NULL));
1063         rv = 0;
1064 err:
1065         free_modules();
1066         free_module_folders();
1067
1068         return rv;
1069 }
1070
1071 static int main_modprobe(int argc, char **argv)
1072 {
1073         struct module_node *mn;
1074         struct module *m;
1075         int exit_code = 0;
1076         int load_fail;
1077         int log_level = LOG_WARNING;
1078         int opt;
1079         bool quiet = false;
1080         bool use_all = false;
1081
1082         while ((opt = getopt(argc, argv, "aqv")) != -1 ) {
1083                 switch (opt) {
1084                         case 'a':
1085                                 use_all = true;
1086                                 break;
1087                         case 'q': /* shhhh! */
1088                                 quiet = true;
1089                                 break;
1090                         case 'v':
1091                                 log_level = LOG_DEBUG;
1092                                 break;
1093                         default: /* '?' */
1094                                 return print_modprobe_usage();
1095                                 break;
1096                         }
1097         }
1098
1099         if (optind >= argc)
1100                 return print_modprobe_usage(); /* expected module after options */
1101
1102         /* after print_modprobe_usage() so it won't be filtered out */
1103         ulog_threshold(log_level);
1104
1105         if (scan_module_folders())
1106                 return -1;
1107
1108         if (scan_loaded_modules())
1109                 return -1;
1110
1111         if (scan_builtin_modules())
1112                 return -1;
1113
1114         do {
1115                 char *name;
1116
1117                 name = get_module_name(argv[optind]);
1118                 m = find_module(name);
1119
1120                 if (m && m->state == BLACKLISTED) {
1121                         if (!quiet)
1122                                 ULOG_INFO("%s is blacklisted\n", name);
1123                 } else if (m && m->state == LOADED) {
1124                         if (!quiet)
1125                                 ULOG_INFO("%s is already loaded\n", name);
1126                 } else if (m && m->state == BUILTIN) {
1127                         if (!quiet)
1128                                 ULOG_INFO("%s is builtin\n", name);
1129                 } else if (!m) {
1130                         if (!quiet)
1131                                 ULOG_ERR("failed to find a module named %s\n", name);
1132                         exit_code = -1;
1133                 } else {
1134                         m->state = PROBE;
1135                 }
1136
1137                 optind++;
1138         } while (use_all && optind < argc);
1139
1140         load_fail = load_modprobe(true);
1141         if (load_fail) {
1142                 ULOG_ERR("%d module%s could not be probed\n",
1143                          load_fail, (load_fail == 1) ? ("") : ("s"));
1144
1145                 avl_for_each_element(&modules, mn, avl) {
1146                         if (mn->is_alias)
1147                                 continue;
1148                         m = mn->m;
1149                         if ((m->state == PROBE) || m->error)
1150                                 ULOG_ERR("- %s\n", m->name);
1151                 }
1152
1153                 exit_code = -1;
1154         }
1155
1156         free_modules();
1157         free_module_folders();
1158
1159         return exit_code;
1160 }
1161
1162 static int main_loader(int argc, char **argv)
1163 {
1164         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
1165         char *dir = "/etc/modules.d/";
1166         struct module_node *mn;
1167         struct module *m;
1168         glob_t gl;
1169         char *path;
1170         int ret = 0, fail, j;
1171
1172         if (argc > 1)
1173                 dir = argv[1];
1174
1175         path = malloc(strlen(dir) + 2);
1176         if (!path) {
1177                 ULOG_ERR("out of memory\n");
1178                 return -1;
1179         }
1180
1181         strcpy(path, dir);
1182         strcat(path, "*");
1183
1184         if (scan_module_folders()) {
1185                 ret = -1;
1186                 goto free_path;
1187         }
1188
1189         if (scan_loaded_modules()) {
1190                 ret = -1;
1191                 goto free_path;
1192         }
1193
1194         ULOG_INFO("loading kernel modules from %s\n", path);
1195
1196         if (glob(path, gl_flags, NULL, &gl) < 0)
1197                 goto out;
1198
1199         for (j = 0; j < gl.gl_pathc; j++) {
1200                 FILE *fp = fopen(gl.gl_pathv[j], "r");
1201                 size_t mod_len = 0;
1202                 char *mod = NULL;
1203
1204                 if (!fp) {
1205                         ULOG_ERR("failed to open %s\n", gl.gl_pathv[j]);
1206                         continue;
1207                 }
1208
1209                 while (getline(&mod, &mod_len, fp) > 0) {
1210                         char *nl = strchr(mod, '\n');
1211                         struct module *m;
1212                         char *opts;
1213
1214                         if (nl)
1215                                 *nl = '\0';
1216
1217                         opts = strchr(mod, ' ');
1218                         if (opts)
1219                                 *opts++ = '\0';
1220
1221                         m = find_module(get_module_name(mod));
1222                         if (!m || m->state == LOADED || m->state == BLACKLISTED)
1223                                 continue;
1224
1225                         if (opts) {
1226                                 if (m->opts) {
1227                                         char *prev = m->opts;
1228
1229                                         fail = asprintf(&m->opts, "%s %s", prev, opts);
1230                                         free(prev);
1231                                         if (fail < 0) {
1232                                                 ULOG_ERR("out of memory for opts %s\n", opts);
1233                                                 free(mod);
1234                                                 fclose(fp);
1235                                                 ret = -1;
1236                                                 goto out;
1237                                         }
1238                                 } else {
1239                                         m->opts = strdup(opts);
1240                                 }
1241                         }
1242                         m->state = PROBE;
1243                         if (basename(gl.gl_pathv[j])[0] - '0' <= 9)
1244                                 load_modprobe(false);
1245
1246                 }
1247                 free(mod);
1248                 fclose(fp);
1249         }
1250
1251         fail = load_modprobe(true);
1252
1253         if (fail) {
1254                 ULOG_ERR("%d module%s could not be probed\n",
1255                          fail, (fail == 1) ? ("") : ("s"));
1256
1257                 avl_for_each_element(&modules, mn, avl) {
1258                         if (mn->is_alias)
1259                                 continue;
1260                         m = mn->m;
1261                         if ((m->state == PROBE) || (m->error))
1262                                 ULOG_ERR("- %s - %d\n", m->name, deps_available(m, 1));
1263                 }
1264         } else {
1265                 ULOG_INFO("done loading kernel modules from %s\n", path);
1266         }
1267
1268 out:
1269         globfree(&gl);
1270         free_modules();
1271         free_module_folders();
1272 free_path:
1273         free(path);
1274
1275         return ret;
1276 }
1277
1278 static inline char weight(char c)
1279 {
1280         return c == '_' ? '-' : c;
1281 }
1282
1283 static int avl_modcmp(const void *k1, const void *k2, void *ptr)
1284 {
1285         const char *s1 = k1;
1286         const char *s2 = k2;
1287
1288         while (*s1 && (weight(*s1) == weight(*s2)))
1289         {
1290                 s1++;
1291                 s2++;
1292         }
1293
1294         return (unsigned char)weight(*s1) - (unsigned char)weight(*s2);
1295 }
1296
1297 static void
1298 load_options(void)
1299 {
1300         static char buf[512];
1301         char *s;
1302         FILE *f;
1303
1304         f = fopen("/etc/modules.conf", "r");
1305         if (!f)
1306                 return;
1307
1308         while ((s = fgets(buf, sizeof(buf), f)) != NULL) {
1309                 char *c, *cmd, *mod;
1310
1311                 while (isspace(*s))
1312                         s++;
1313
1314                 c = strchr(s, '#');
1315                 if (c)
1316                         *c = 0;
1317
1318                 while (isspace(*s))
1319                         s++;
1320
1321                 c = s + strlen(s);
1322                 while (c > s && isspace(c[-1])) {
1323                         c[-1] = 0;
1324                         c--;
1325                 }
1326
1327                 cmd = strsep(&s, " \t");
1328                 if (!cmd || !*cmd)
1329                         continue;
1330
1331                 while (isspace(*s))
1332                         s++;
1333
1334                 mod = strsep(&s, " \t");
1335                 if (!mod || !*mod)
1336                         continue;
1337
1338                 if (!strcmp(cmd, "blacklist")) {
1339                         kvlist_set(&options, mod, "\x01");
1340                         continue;
1341                 }
1342
1343                 if (!strcmp(cmd, "options")) {
1344                         char *prev = kvlist_get(&options, mod);
1345                         char *val = NULL;
1346
1347                         while (isspace(*s))
1348                                 s++;
1349
1350                         if (!*s)
1351                                 continue;
1352
1353                         if (prev && prev[0] == '\x01')
1354                                 continue;
1355
1356                         if (!prev) {
1357                                 kvlist_set(&options, mod, s);
1358                                 continue;
1359                         }
1360
1361                         if (asprintf(&val, "%s %s", prev, s) < 0)
1362                                 continue;
1363
1364                         kvlist_set(&options, mod, val);
1365                         free(val);
1366                         continue;
1367                 }
1368         }
1369
1370         fclose(f);
1371 }
1372
1373 int main(int argc, char **argv)
1374 {
1375         char *exec = basename(*argv);
1376
1377         avl_init(&modules, avl_modcmp, true, NULL);
1378         if (!strcmp(exec, "insmod"))
1379                 return main_insmod(argc, argv);
1380
1381         if (!strcmp(exec, "rmmod"))
1382                 return main_rmmod(argc, argv);
1383
1384         if (!strcmp(exec, "lsmod"))
1385                 return main_lsmod(argc, argv);
1386
1387         if (!strcmp(exec, "modinfo"))
1388                 return main_modinfo(argc, argv);
1389
1390         load_options();
1391
1392         if (!strcmp(exec, "modprobe"))
1393                 return main_modprobe(argc, argv);
1394
1395         ulog_open(ULOG_KMSG, LOG_USER, "kmodloader");
1396         return main_loader(argc, argv);
1397 }