libkmod/libkmod-config.c

   1 /*
   2  * libkmod - interface to kernel module operations
   3  *
   4  * Copyright (C) 2011-2013  ProFUSION embedded systems
   5  * Copyright (C) 2013  Intel Corporation. All rights reserved.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <ctype.h>
  22 #include <dirent.h>
  23 #include <errno.h>
  24 #include <stdarg.h>
  25 #include <stddef.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <sys/stat.h>
  31 #include <sys/types.h>
  32
  33 #include <shared/util.h>
  34
  35 #include "libkmod.h"
  36 #include "libkmod-internal.h"
  37
  38 struct kmod_alias {
  39         char *name;
  40         char modname[];
  41 };
  42
  43 struct kmod_options {
  44         char *options;
  45         char modname[];
  46 };
  47
  48 struct kmod_command {
  49         char *command;
  50         char modname[];
  51 };
  52
  53 struct kmod_softdep {
  54         char *name;
  55         const char **pre;
  56         const char **post;
  57         unsigned int n_pre;
  58         unsigned int n_post;
  59 };
  60
  61 const char *kmod_blacklist_get_modname(const struct kmod_list *l)
  62 {
  63         return l->data;
  64 }
  65
  66 const char *kmod_alias_get_name(const struct kmod_list *l) {
  67         const struct kmod_alias *alias = l->data;
  68         return alias->name;
  69 }
  70
  71 const char *kmod_alias_get_modname(const struct kmod_list *l) {
  72         const struct kmod_alias *alias = l->data;
  73         return alias->modname;
  74 }
  75
  76 const char *kmod_option_get_options(const struct kmod_list *l) {
  77         const struct kmod_options *alias = l->data;
  78         return alias->options;
  79 }
  80
  81 const char *kmod_option_get_modname(const struct kmod_list *l) {
  82         const struct kmod_options *alias = l->data;
  83         return alias->modname;
  84 }
  85
  86 const char *kmod_command_get_command(const struct kmod_list *l) {
  87         const struct kmod_command *alias = l->data;
  88         return alias->command;
  89 }
  90
  91 const char *kmod_command_get_modname(const struct kmod_list *l) {
  92         const struct kmod_command *alias = l->data;
  93         return alias->modname;
  94 }
  95
  96 const char *kmod_softdep_get_name(const struct kmod_list *l) {
  97         const struct kmod_softdep *dep = l->data;
  98         return dep->name;
  99 }
 100
 101 const char * const *kmod_softdep_get_pre(const struct kmod_list *l, unsigned int *count) {
 102         const struct kmod_softdep *dep = l->data;
 103         *count = dep->n_pre;
 104         return dep->pre;
 105 }
 106
 107 const char * const *kmod_softdep_get_post(const struct kmod_list *l, unsigned int *count) {
 108         const struct kmod_softdep *dep = l->data;
 109         *count = dep->n_post;
 110         return dep->post;
 111 }
 112
 113 static int kmod_config_add_command(struct kmod_config *config,
 114                                                 const char *modname,
 115                                                 const char *command,
 116                                                 const char *command_name,
 117                                                 struct kmod_list **list)
 118 {
 119         _cleanup_free_ struct kmod_command *cmd;
 120         struct kmod_list *l;
 121         size_t modnamelen = strlen(modname) + 1;
 122         size_t commandlen = strlen(command) + 1;
 123
 124         DBG(config->ctx, "modname='%s' cmd='%s %s'\n", modname, command_name,
 125                                                                 command);
 126
 127         cmd = malloc(sizeof(*cmd) + modnamelen + commandlen);
 128         if (!cmd)
 129                 return -ENOMEM;
 130
 131         cmd->command = sizeof(*cmd) + modnamelen + (char *)cmd;
 132         memcpy(cmd->modname, modname, modnamelen);
 133         memcpy(cmd->command, command, commandlen);
 134
 135         l = kmod_list_append(*list, cmd);
 136         if (!l)
 137                 return -ENOMEM;
 138
 139         *list = l;
 140         cmd = NULL;
 141         return 0;
 142 }
 143
 144 static void kmod_config_free_command(struct kmod_config *config,
 145                                         struct kmod_list *l,
 146                                         struct kmod_list **list)
 147 {
 148         struct kmod_command *cmd = l->data;
 149
 150         free(cmd);
 151         *list = kmod_list_remove(l);
 152 }
 153
 154 static int kmod_config_add_options(struct kmod_config *config,
 155                                 const char *modname, const char *options)
 156 {
 157         _cleanup_free_ struct kmod_options *opt;
 158         struct kmod_list *list;
 159         size_t modnamelen = strlen(modname) + 1;
 160         size_t optionslen = strlen(options) + 1;
 161
 162         DBG(config->ctx, "modname='%s' options='%s'\n", modname, options);
 163
 164         opt = malloc(sizeof(*opt) + modnamelen + optionslen);
 165         if (!opt)
 166                 return -ENOMEM;
 167
 168         opt->options = sizeof(*opt) + modnamelen + (char *)opt;
 169
 170         memcpy(opt->modname, modname, modnamelen);
 171         memcpy(opt->options, options, optionslen);
 172         strchr_replace(opt->options, '\t', ' ');
 173
 174         list = kmod_list_append(config->options, opt);
 175         if (!list)
 176                 return -ENOMEM;
 177
 178         opt = NULL;
 179         config->options = list;
 180         return 0;
 181 }
 182
 183 static void kmod_config_free_options(struct kmod_config *config,
 184                                                         struct kmod_list *l)
 185 {
 186         struct kmod_options *opt = l->data;
 187
 188         free(opt);
 189
 190         config->options = kmod_list_remove(l);
 191 }
 192
 193 static int kmod_config_add_alias(struct kmod_config *config,
 194                                         const char *name, const char *modname)
 195 {
 196         _cleanup_free_ struct kmod_alias *alias;
 197         struct kmod_list *list;
 198         size_t namelen = strlen(name) + 1, modnamelen = strlen(modname) + 1;
 199
 200         DBG(config->ctx, "name=%s modname=%s\n", name, modname);
 201
 202         alias = malloc(sizeof(*alias) + namelen + modnamelen);
 203         if (!alias)
 204                 return -ENOMEM;
 205
 206         alias->name = sizeof(*alias) + modnamelen + (char *)alias;
 207
 208         memcpy(alias->modname, modname, modnamelen);
 209         memcpy(alias->name, name, namelen);
 210
 211         list = kmod_list_append(config->aliases, alias);
 212         if (!list)
 213                 return -ENOMEM;
 214
 215         alias = NULL;
 216         config->aliases = list;
 217         return 0;
 218 }
 219
 220 static void kmod_config_free_alias(struct kmod_config *config,
 221                                                         struct kmod_list *l)
 222 {
 223         struct kmod_alias *alias = l->data;
 224
 225         free(alias);
 226
 227         config->aliases = kmod_list_remove(l);
 228 }
 229
 230 static int kmod_config_add_blacklist(struct kmod_config *config,
 231                                                         const char *modname)
 232 {
 233         _cleanup_free_ char *p;
 234         struct kmod_list *list;
 235
 236         DBG(config->ctx, "modname=%s\n", modname);
 237
 238         p = strdup(modname);
 239         if (!p)
 240                 return -ENOMEM;
 241
 242         list = kmod_list_append(config->blacklists, p);
 243         if (!list)
 244                 return -ENOMEM;
 245
 246         p = NULL;
 247         config->blacklists = list;
 248         return 0;
 249 }
 250
 251 static void kmod_config_free_blacklist(struct kmod_config *config,
 252                                                         struct kmod_list *l)
 253 {
 254         free(l->data);
 255         config->blacklists = kmod_list_remove(l);
 256 }
 257
 258 static int kmod_config_add_softdep(struct kmod_config *config,
 259                                                         const char *modname,
 260                                                         const char *line)
 261 {
 262         struct kmod_list *list;
 263         struct kmod_softdep *dep;
 264         const char *s, *p;
 265         char *itr;
 266         unsigned int n_pre = 0, n_post = 0;
 267         size_t modnamelen = strlen(modname) + 1;
 268         size_t buflen = 0;
 269         bool was_space = false;
 270         enum { S_NONE, S_PRE, S_POST } mode = S_NONE;
 271
 272         DBG(config->ctx, "modname=%s\n", modname);
 273
 274         /* analyze and count */
 275         for (p = s = line; ; s++) {
 276                 size_t plen;
 277
 278                 if (*s != '\0') {
 279                         if (!isspace(*s)) {
 280                                 was_space = false;
 281                                 continue;
 282                         }
 283
 284                         if (was_space) {
 285                                 p = s + 1;
 286                                 continue;
 287                         }
 288                         was_space = true;
 289
 290                         if (p >= s)
 291                                 continue;
 292                 }
 293                 plen = s - p;
 294
 295                 if (plen == sizeof("pre:") - 1 &&
 296                                 memcmp(p, "pre:", sizeof("pre:") - 1) == 0)
 297                         mode = S_PRE;
 298                 else if (plen == sizeof("post:") - 1 &&
 299                                 memcmp(p, "post:", sizeof("post:") - 1) == 0)
 300                         mode = S_POST;
 301                 else if (*s != '\0' || (*s == '\0' && !was_space)) {
 302                         if (mode == S_PRE) {
 303                                 buflen += plen + 1;
 304                                 n_pre++;
 305                         } else if (mode == S_POST) {
 306                                 buflen += plen + 1;
 307                                 n_post++;
 308                         }
 309                 }
 310                 p = s + 1;
 311                 if (*s == '\0')
 312                         break;
 313         }
 314
 315         DBG(config->ctx, "%u pre, %u post\n", n_pre, n_post);
 316
 317         dep = malloc(sizeof(struct kmod_softdep) + modnamelen +
 318                      n_pre * sizeof(const char *) +
 319                      n_post * sizeof(const char *) +
 320                      buflen);
 321         if (dep == NULL) {
 322                 ERR(config->ctx, "out-of-memory modname=%s\n", modname);
 323                 return -ENOMEM;
 324         }
 325         dep->n_pre = n_pre;
 326         dep->n_post = n_post;
 327         dep->pre = (const char **)((char *)dep + sizeof(struct kmod_softdep));
 328         dep->post = dep->pre + n_pre;
 329         dep->name = (char *)(dep->post + n_post);
 330
 331         memcpy(dep->name, modname, modnamelen);
 332
 333         /* copy strings */
 334         itr = dep->name + modnamelen;
 335         n_pre = 0;
 336         n_post = 0;
 337         mode = S_NONE;
 338         for (p = s = line; ; s++) {
 339                 size_t plen;
 340
 341                 if (*s != '\0') {
 342                         if (!isspace(*s)) {
 343                                 was_space = false;
 344                                 continue;
 345                         }
 346
 347                         if (was_space) {
 348                                 p = s + 1;
 349                                 continue;
 350                         }
 351                         was_space = true;
 352
 353                         if (p >= s)
 354                                 continue;
 355                 }
 356                 plen = s - p;
 357
 358                 if (plen == sizeof("pre:") - 1 &&
 359                                 memcmp(p, "pre:", sizeof("pre:") - 1) == 0)
 360                         mode = S_PRE;
 361                 else if (plen == sizeof("post:") - 1 &&
 362                                 memcmp(p, "post:", sizeof("post:") - 1) == 0)
 363                         mode = S_POST;
 364                 else if (*s != '\0' || (*s == '\0' && !was_space)) {
 365                         if (mode == S_PRE) {
 366                                 dep->pre[n_pre] = itr;
 367                                 memcpy(itr, p, plen);
 368                                 itr[plen] = '\0';
 369                                 itr += plen + 1;
 370                                 n_pre++;
 371                         } else if (mode == S_POST) {
 372                                 dep->post[n_post] = itr;
 373                                 memcpy(itr, p, plen);
 374                                 itr[plen] = '\0';
 375                                 itr += plen + 1;
 376                                 n_post++;
 377                         }
 378                 }
 379                 p = s + 1;
 380                 if (*s == '\0')
 381                         break;
 382         }
 383
 384         list = kmod_list_append(config->softdeps, dep);
 385         if (list == NULL) {
 386                 free(dep);
 387                 return -ENOMEM;
 388         }
 389         config->softdeps = list;
 390
 391         return 0;
 392 }
 393
 394 static char *softdep_to_char(struct kmod_softdep *dep) {
 395         const size_t sz_preprefix = sizeof("pre: ") - 1;
 396         const size_t sz_postprefix = sizeof("post: ") - 1;
 397         size_t sz = 1; /* at least '\0' */
 398         size_t sz_pre, sz_post;
 399         const char *start, *end;
 400         char *s, *itr;
 401
 402         /*
 403          * Rely on the fact that dep->pre[] and dep->post[] are strv's that
 404          * point to a contiguous buffer
 405          */
 406         if (dep->n_pre > 0) {
 407                 start = dep->pre[0];
 408                 end = dep->pre[dep->n_pre - 1]
 409                                         + strlen(dep->pre[dep->n_pre - 1]);
 410                 sz_pre = end - start;
 411                 sz += sz_pre + sz_preprefix;
 412         } else
 413                 sz_pre = 0;
 414
 415         if (dep->n_post > 0) {
 416                 start = dep->post[0];
 417                 end = dep->post[dep->n_post - 1]
 418                                         + strlen(dep->post[dep->n_post - 1]);
 419                 sz_post = end - start;
 420                 sz += sz_post + sz_postprefix;
 421         } else
 422                 sz_post = 0;
 423
 424         itr = s = malloc(sz);
 425         if (s == NULL)
 426                 return NULL;
 427
 428         if (sz_pre) {
 429                 char *p;
 430
 431                 memcpy(itr, "pre: ", sz_preprefix);
 432                 itr += sz_preprefix;
 433
 434                 /* include last '\0' */
 435                 memcpy(itr, dep->pre[0], sz_pre + 1);
 436                 for (p = itr; p < itr + sz_pre; p++) {
 437                         if (*p == '\0')
 438                                 *p = ' ';
 439                 }
 440                 itr = p;
 441         }
 442
 443         if (sz_post) {
 444                 char *p;
 445
 446                 memcpy(itr, "post: ", sz_postprefix);
 447                 itr += sz_postprefix;
 448
 449                 /* include last '\0' */
 450                 memcpy(itr, dep->post[0], sz_post + 1);
 451                 for (p = itr; p < itr + sz_post; p++) {
 452                         if (*p == '\0')
 453                                 *p = ' ';
 454                 }
 455                 itr = p;
 456         }
 457
 458         *itr = '\0';
 459
 460         return s;
 461 }
 462
 463 static void kmod_config_free_softdep(struct kmod_config *config,
 464                                                         struct kmod_list *l)
 465 {
 466         free(l->data);
 467         config->softdeps = kmod_list_remove(l);
 468 }
 469
 470 static void kcmdline_parse_result(struct kmod_config *config, char *modname,
 471                                                 char *param, char *value)
 472 {
 473         if (modname == NULL || param == NULL)
 474                 return;
 475
 476         DBG(config->ctx, "%s %s\n", modname, param);
 477
 478         if (streq(modname, "modprobe") && !strncmp(param, "blacklist=", 10)) {
 479                 for (;;) {
 480                         char *t = strsep(&value, ",");
 481                         if (t == NULL)
 482                                 break;
 483
 484                         kmod_config_add_blacklist(config, t);
 485                 }
 486         } else {
 487                 if (underscores(modname) < 0) {
 488                         ERR(config->ctx, "Ignoring bad option on kernel command line while parsing module name: '%s'\n",
 489                             modname);
 490                 }
 491                 kmod_config_add_options(config, modname, param);
 492         }
 493 }
 494
 495 static int kmod_config_parse_kcmdline(struct kmod_config *config)
 496 {
 497         char buf[KCMD_LINE_SIZE];
 498         int fd, err;
 499         char *p, *modname,  *param = NULL, *value = NULL;
 500         bool is_quoted = false, is_module = true;
 501
 502         fd = open("/proc/cmdline", O_RDONLY|O_CLOEXEC);
 503         if (fd < 0) {
 504                 err = -errno;
 505                 DBG(config->ctx, "could not open '/proc/cmdline' for reading: %m\n");
 506                 return err;
 507         }
 508
 509         err = read_str_safe(fd, buf, sizeof(buf));
 510         close(fd);
 511         if (err < 0) {
 512                 ERR(config->ctx, "could not read from '/proc/cmdline': %s\n",
 513                                                         strerror(-err));
 514                 return err;
 515         }
 516
 517         for (p = buf, modname = buf; *p != '\0' && *p != '\n'; p++) {
 518                 if (*p == '"') {
 519                         is_quoted = !is_quoted;
 520                         continue;
 521                 }
 522                 if (is_quoted)
 523                         continue;
 524                 switch (*p) {
 525                 case ' ':
 526                         *p = '\0';
 527                         if (is_module)
 528                                 kcmdline_parse_result(config, modname, param, value);
 529                         param = value = NULL;
 530                         modname = p + 1;
 531                         is_module = true;
 532                         break;
 533                 case '.':
 534                         if (param == NULL) {
 535                                 *p = '\0';
 536                                 param = p + 1;
 537                         }
 538                         break;
 539                 case '=':
 540                         if (param != NULL)
 541                                 value = p + 1;
 542                         else
 543                                 is_module = false;
 544                         break;
 545                 }
 546         }
 547
 548         *p = '\0';
 549         if (is_module)
 550                 kcmdline_parse_result(config, modname, param, value);
 551
 552         return 0;
 553 }
 554
 555 /*
 556  * Take an fd and own it. It will be closed on return. filename is used only
 557  * for debug messages
 558  */
 559 static int kmod_config_parse(struct kmod_config *config, int fd,
 560                                                         const char *filename)
 561 {
 562         struct kmod_ctx *ctx = config->ctx;
 563         char *line;
 564         FILE *fp;
 565         unsigned int linenum = 0;
 566         int err;
 567
 568         fp = fdopen(fd, "r");
 569         if (fp == NULL) {
 570                 err = -errno;
 571                 ERR(config->ctx, "fd %d: %m\n", fd);
 572                 close(fd);
 573                 return err;
 574         }
 575
 576         while ((line = freadline_wrapped(fp, &linenum)) != NULL) {
 577                 char *cmd, *saveptr;
 578
 579                 if (line[0] == '\0' || line[0] == '#')
 580                         goto done_next;
 581
 582                 cmd = strtok_r(line, "\t ", &saveptr);
 583                 if (cmd == NULL)
 584                         goto done_next;
 585
 586                 if (streq(cmd, "alias")) {
 587                         char *alias = strtok_r(NULL, "\t ", &saveptr);
 588                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 589
 590                         if (underscores(alias) < 0 || underscores(modname) < 0)
 591                                 goto syntax_error;
 592
 593                         kmod_config_add_alias(config, alias, modname);
 594                 } else if (streq(cmd, "blacklist")) {
 595                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 596
 597                         if (underscores(modname) < 0)
 598                                 goto syntax_error;
 599
 600                         kmod_config_add_blacklist(config, modname);
 601                 } else if (streq(cmd, "options")) {
 602                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 603                         char *options = strtok_r(NULL, "\0", &saveptr);
 604
 605                         if (underscores(modname) < 0 || options == NULL)
 606                                 goto syntax_error;
 607
 608                         kmod_config_add_options(config, modname, options);
 609                 } else if (streq(cmd, "install")) {
 610                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 611                         char *installcmd = strtok_r(NULL, "\0", &saveptr);
 612
 613                         if (underscores(modname) < 0 || installcmd == NULL)
 614                                 goto syntax_error;
 615
 616                         kmod_config_add_command(config, modname, installcmd,
 617                                         cmd, &config->install_commands);
 618                 } else if (streq(cmd, "remove")) {
 619                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 620                         char *removecmd = strtok_r(NULL, "\0", &saveptr);
 621
 622                         if (underscores(modname) < 0 || removecmd == NULL)
 623                                 goto syntax_error;
 624
 625                         kmod_config_add_command(config, modname, removecmd,
 626                                         cmd, &config->remove_commands);
 627                 } else if (streq(cmd, "softdep")) {
 628                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 629                         char *softdeps = strtok_r(NULL, "\0", &saveptr);
 630
 631                         if (underscores(modname) < 0 || softdeps == NULL)
 632                                 goto syntax_error;
 633
 634                         kmod_config_add_softdep(config, modname, softdeps);
 635                 } else if (streq(cmd, "include")
 636                                 || streq(cmd, "config")) {
 637                         ERR(ctx, "%s: command %s is deprecated and not parsed anymore\n",
 638                                                                 filename, cmd);
 639                 } else {
 640 syntax_error:
 641                         ERR(ctx, "%s line %u: ignoring bad line starting with '%s'\n",
 642                                                 filename, linenum, cmd);
 643                 }
 644
 645 done_next:
 646                 free(line);
 647         }
 648
 649         fclose(fp);
 650
 651         return 0;
 652 }
 653
 654 void kmod_config_free(struct kmod_config *config)
 655 {
 656         while (config->aliases)
 657                 kmod_config_free_alias(config, config->aliases);
 658
 659         while (config->blacklists)
 660                 kmod_config_free_blacklist(config, config->blacklists);
 661
 662         while (config->options)
 663                 kmod_config_free_options(config, config->options);
 664
 665         while (config->install_commands) {
 666                 kmod_config_free_command(config, config->install_commands,
 667                                                 &config->install_commands);
 668         }
 669
 670         while (config->remove_commands) {
 671                 kmod_config_free_command(config, config->remove_commands,
 672                                                 &config->remove_commands);
 673         }
 674
 675         while (config->softdeps)
 676                 kmod_config_free_softdep(config, config->softdeps);
 677
 678         for (; config->paths != NULL;
 679                                 config->paths = kmod_list_remove(config->paths))
 680                 free(config->paths->data);
 681
 682         free(config);
 683 }
 684
 685 static bool conf_files_filter_out(struct kmod_ctx *ctx, DIR *d,
 686                                         const char *path, const char *fn)
 687 {
 688         size_t len = strlen(fn);
 689         struct stat st;
 690
 691         if (fn[0] == '.')
 692                 return true;
 693
 694         if (len < 6 || (!streq(&fn[len - 5], ".conf")
 695                                 && !streq(&fn[len - 6], ".alias")))
 696                 return true;
 697
 698         fstatat(dirfd(d), fn, &st, 0);
 699
 700         if (S_ISDIR(st.st_mode)) {
 701                 ERR(ctx, "Directories inside directories are not supported: "
 702                                                         "%s/%s\n", path, fn);
 703                 return true;
 704         }
 705
 706         return false;
 707 }
 708
 709 struct conf_file {
 710         const char *path;
 711         bool is_single;
 712         char name[];
 713 };
 714
 715 static int conf_files_insert_sorted(struct kmod_ctx *ctx,
 716                                         struct kmod_list **list,
 717                                         const char *path, const char *name)
 718 {
 719         struct kmod_list *lpos, *tmp;
 720         struct conf_file *cf;
 721         size_t namelen;
 722         int cmp = -1;
 723         bool is_single = false;
 724
 725         if (name == NULL) {
 726                 name = basename(path);
 727                 is_single = true;
 728         }
 729
 730         kmod_list_foreach(lpos, *list) {
 731                 cf = lpos->data;
 732
 733                 if ((cmp = strcmp(name, cf->name)) <= 0)
 734                         break;
 735         }
 736
 737         if (cmp == 0) {
 738                 DBG(ctx, "Ignoring duplicate config file: %s/%s\n", path,
 739                                                                         name);
 740                 return -EEXIST;
 741         }
 742
 743         namelen = strlen(name);
 744         cf = malloc(sizeof(*cf) + namelen + 1);
 745         if (cf == NULL)
 746                 return -ENOMEM;
 747
 748         memcpy(cf->name, name, namelen + 1);
 749         cf->path = path;
 750         cf->is_single = is_single;
 751
 752         if (lpos == NULL)
 753                 tmp = kmod_list_append(*list, cf);
 754         else if (lpos == *list)
 755                 tmp = kmod_list_prepend(*list, cf);
 756         else
 757                 tmp = kmod_list_insert_before(lpos, cf);
 758
 759         if (tmp == NULL) {
 760                 free(cf);
 761                 return -ENOMEM;
 762         }
 763
 764         if (lpos == NULL || lpos == *list)
 765                 *list = tmp;
 766
 767         return 0;
 768 }
 769
 770 /*
 771  * Insert configuration files in @list, ignoring duplicates
 772  */
 773 static int conf_files_list(struct kmod_ctx *ctx, struct kmod_list **list,
 774                                                 const char *path,
 775                                                 unsigned long long *path_stamp)
 776 {
 777         DIR *d;
 778         int err;
 779         struct stat st;
 780         struct dirent *dent;
 781
 782         if (stat(path, &st) != 0) {
 783                 err = -errno;
 784                 DBG(ctx, "could not stat '%s': %m\n", path);
 785                 return err;
 786         }
 787
 788         *path_stamp = stat_mstamp(&st);
 789
 790         if (!S_ISDIR(st.st_mode)) {
 791                 conf_files_insert_sorted(ctx, list, path, NULL);
 792                 return 0;
 793         }
 794
 795         d = opendir(path);
 796         if (d == NULL) {
 797                 ERR(ctx, "opendir(%s): %m\n", path);
 798                 return -EINVAL;
 799         }
 800
 801         for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
 802                 if (conf_files_filter_out(ctx, d, path, dent->d_name))
 803                         continue;
 804
 805                 conf_files_insert_sorted(ctx, list, path, dent->d_name);
 806         }
 807
 808         closedir(d);
 809         return 0;
 810 }
 811
 812 int kmod_config_new(struct kmod_ctx *ctx, struct kmod_config **p_config,
 813                                         const char * const *config_paths)
 814 {
 815         struct kmod_config *config;
 816         struct kmod_list *list = NULL;
 817         struct kmod_list *path_list = NULL;
 818         size_t i;
 819
 820         conf_files_insert_sorted(ctx, &list, kmod_get_dirname(ctx), "modules.softdep");
 821
 822         for (i = 0; config_paths[i] != NULL; i++) {
 823                 const char *path = config_paths[i];
 824                 unsigned long long path_stamp = 0;
 825                 size_t pathlen;
 826                 struct kmod_list *tmp;
 827                 struct kmod_config_path *cf;
 828
 829                 if (conf_files_list(ctx, &list, path, &path_stamp) < 0)
 830                         continue;
 831
 832                 pathlen = strlen(path) + 1;
 833                 cf = malloc(sizeof(*cf) + pathlen);
 834                 if (cf == NULL)
 835                         goto oom;
 836
 837                 cf->stamp = path_stamp;
 838                 memcpy(cf->path, path, pathlen);
 839
 840                 tmp = kmod_list_append(path_list, cf);
 841                 if (tmp == NULL)
 842                         goto oom;
 843                 path_list = tmp;
 844         }
 845
 846         *p_config = config = calloc(1, sizeof(struct kmod_config));
 847         if (config == NULL)
 848                 goto oom;
 849
 850         config->paths = path_list;
 851         config->ctx = ctx;
 852
 853         for (; list != NULL; list = kmod_list_remove(list)) {
 854                 char buf[PATH_MAX];
 855                 const char *fn = buf;
 856                 struct conf_file *cf = list->data;
 857                 int fd;
 858
 859                 if (cf->is_single) {
 860                         fn = cf->path;
 861                 } else if (snprintf(buf, sizeof(buf), "%s/%s",
 862                                     cf->path, cf->name) >= (int)sizeof(buf)) {
 863                         ERR(ctx, "Error parsing %s/%s: path too long\n",
 864                             cf->path, cf->name);
 865                         free(cf);
 866                         continue;
 867                 }
 868
 869                 fd = open(fn, O_RDONLY|O_CLOEXEC);
 870                 DBG(ctx, "parsing file '%s' fd=%d\n", fn, fd);
 871
 872                 if (fd >= 0)
 873                         kmod_config_parse(config, fd, fn);
 874
 875                 free(cf);
 876         }
 877
 878         kmod_config_parse_kcmdline(config);
 879
 880         return 0;
 881
 882 oom:
 883         for (; list != NULL; list = kmod_list_remove(list))
 884                 free(list->data);
 885
 886         for (; path_list != NULL; path_list = kmod_list_remove(path_list))
 887                 free(path_list->data);
 888
 889         return -ENOMEM;
 890 }
 891
 892 /**********************************************************************
 893  * struct kmod_config_iter functions
 894  **********************************************************************/
 895
 896 enum config_type {
 897         CONFIG_TYPE_BLACKLIST = 0,
 898         CONFIG_TYPE_INSTALL,
 899         CONFIG_TYPE_REMOVE,
 900         CONFIG_TYPE_ALIAS,
 901         CONFIG_TYPE_OPTION,
 902         CONFIG_TYPE_SOFTDEP,
 903 };
 904
 905 struct kmod_config_iter {
 906         enum config_type type;
 907         bool intermediate;
 908         const struct kmod_list *list;
 909         const struct kmod_list *curr;
 910         void *data;
 911         const char *(*get_key)(const struct kmod_list *l);
 912         const char *(*get_value)(const struct kmod_list *l);
 913 };
 914
 915 static const char *softdep_get_plain_softdep(const struct kmod_list *l)
 916 {
 917         char *s = softdep_to_char(l->data);
 918         return s;
 919 }
 920
 921 static struct kmod_config_iter *kmod_config_iter_new(const struct kmod_ctx* ctx,
 922                                                         enum config_type type)
 923 {
 924         struct kmod_config_iter *iter = calloc(1, sizeof(*iter));
 925         const struct kmod_config *config = kmod_get_config(ctx);
 926
 927         if (iter == NULL)
 928                 return NULL;
 929
 930         iter->type = type;
 931
 932         switch (type) {
 933         case CONFIG_TYPE_BLACKLIST:
 934                 iter->list = config->blacklists;
 935                 iter->get_key = kmod_blacklist_get_modname;
 936                 break;
 937         case CONFIG_TYPE_INSTALL:
 938                 iter->list = config->install_commands;
 939                 iter->get_key = kmod_command_get_modname;
 940                 iter->get_value = kmod_command_get_command;
 941                 break;
 942         case CONFIG_TYPE_REMOVE:
 943                 iter->list = config->remove_commands;
 944                 iter->get_key = kmod_command_get_modname;
 945                 iter->get_value = kmod_command_get_command;
 946                 break;
 947         case CONFIG_TYPE_ALIAS:
 948                 iter->list = config->aliases;
 949                 iter->get_key = kmod_alias_get_name;
 950                 iter->get_value = kmod_alias_get_modname;
 951                 break;
 952         case CONFIG_TYPE_OPTION:
 953                 iter->list = config->options;
 954                 iter->get_key = kmod_option_get_modname;
 955                 iter->get_value = kmod_option_get_options;
 956                 break;
 957         case CONFIG_TYPE_SOFTDEP:
 958                 iter->list = config->softdeps;
 959                 iter->get_key = kmod_softdep_get_name;
 960                 iter->get_value = softdep_get_plain_softdep;
 961                 iter->intermediate = true;
 962                 break;
 963         }
 964
 965         return iter;
 966 }
 967
 968 /**
 969  * SECTION:libkmod-config
 970  * @short_description: retrieve current libkmod configuration
 971  */
 972
 973 /**
 974  * kmod_config_get_blacklists:
 975  * @ctx: kmod library context
 976  *
 977  * Retrieve an iterator to deal with the blacklist maintained inside the
 978  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
 979  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
 980  * be made to initialize the iterator and check if it's valid.
 981  *
 982  * Returns: a new iterator over the blacklists or NULL on failure. Free it
 983  * with kmod_config_iter_free_iter().
 984  */
 985 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_blacklists(const struct kmod_ctx *ctx)
 986 {
 987         if (ctx == NULL)
 988                 return NULL;;
 989
 990         return kmod_config_iter_new(ctx, CONFIG_TYPE_BLACKLIST);
 991 }
 992
 993 /**
 994  * kmod_config_get_install_commands:
 995  * @ctx: kmod library context
 996  *
 997  * Retrieve an iterator to deal with the install commands maintained inside the
 998  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
 999  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1000  * be made to initialize the iterator and check if it's valid.
1001  *
1002  * Returns: a new iterator over the install commands or NULL on failure. Free
1003  * it with kmod_config_iter_free_iter().
1004  */
1005 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_install_commands(const struct kmod_ctx *ctx)
1006 {
1007         if (ctx == NULL)
1008                 return NULL;;
1009
1010         return kmod_config_iter_new(ctx, CONFIG_TYPE_INSTALL);
1011 }
1012
1013 /**
1014  * kmod_config_get_remove_commands:
1015  * @ctx: kmod library context
1016  *
1017  * Retrieve an iterator to deal with the remove commands maintained inside the
1018  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1019  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1020  * be made to initialize the iterator and check if it's valid.
1021  *
1022  * Returns: a new iterator over the remove commands or NULL on failure. Free
1023  * it with kmod_config_iter_free_iter().
1024  */
1025 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *ctx)
1026 {
1027         if (ctx == NULL)
1028                 return NULL;;
1029
1030         return kmod_config_iter_new(ctx, CONFIG_TYPE_REMOVE);
1031 }
1032
1033 /**
1034  * kmod_config_get_aliases:
1035  * @ctx: kmod library context
1036  *
1037  * Retrieve an iterator to deal with the aliases maintained inside the
1038  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1039  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1040  * be made to initialize the iterator and check if it's valid.
1041  *
1042  * Returns: a new iterator over the aliases or NULL on failure. Free it with
1043  * kmod_config_iter_free_iter().
1044  */
1045 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx)
1046 {
1047         if (ctx == NULL)
1048                 return NULL;;
1049
1050         return kmod_config_iter_new(ctx, CONFIG_TYPE_ALIAS);
1051 }
1052
1053 /**
1054  * kmod_config_get_options:
1055  * @ctx: kmod library context
1056  *
1057  * Retrieve an iterator to deal with the options maintained inside the
1058  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1059  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1060  * be made to initialize the iterator and check if it's valid.
1061  *
1062  * Returns: a new iterator over the options or NULL on failure. Free it with
1063  * kmod_config_iter_free_iter().
1064  */
1065 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx)
1066 {
1067         if (ctx == NULL)
1068                 return NULL;;
1069
1070         return kmod_config_iter_new(ctx, CONFIG_TYPE_OPTION);
1071 }
1072
1073 /**
1074  * kmod_config_get_softdeps:
1075  * @ctx: kmod library context
1076  *
1077  * Retrieve an iterator to deal with the softdeps maintained inside the
1078  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1079  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1080  * be made to initialize the iterator and check if it's valid.
1081  *
1082  * Returns: a new iterator over the softdeps or NULL on failure. Free it with
1083  * kmod_config_iter_free_iter().
1084  */
1085 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx)
1086 {
1087         if (ctx == NULL)
1088                 return NULL;;
1089
1090         return kmod_config_iter_new(ctx, CONFIG_TYPE_SOFTDEP);
1091 }
1092
1093 /**
1094  * kmod_config_iter_get_key:
1095  * @iter: iterator over a certain configuration
1096  *
1097  * When using a new allocated iterator, user must perform a call to
1098  * kmod_config_iter_next() to initialize iterator's position and check if it's
1099  * valid.
1100  *
1101  * Returns: the key of the current configuration pointed by @iter.
1102  */
1103 KMOD_EXPORT const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter)
1104 {
1105         if (iter == NULL || iter->curr == NULL)
1106                 return NULL;
1107
1108         return iter->get_key(iter->curr);
1109 }
1110
1111 /**
1112  * kmod_config_iter_get_value:
1113  * @iter: iterator over a certain configuration
1114  *
1115  * When using a new allocated iterator, user must perform a call to
1116  * kmod_config_iter_next() to initialize iterator's position and check if it's
1117  * valid.
1118  *
1119  * Returns: the value of the current configuration pointed by @iter.
1120  */
1121 KMOD_EXPORT const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter)
1122 {
1123         const char *s;
1124
1125         if (iter == NULL || iter->curr == NULL)
1126                 return NULL;
1127
1128         if (iter->get_value == NULL)
1129                 return NULL;
1130
1131         if (iter->intermediate) {
1132                 struct kmod_config_iter *i = (struct kmod_config_iter *)iter;
1133
1134                 free(i->data);
1135                 s = i->data = (void *) iter->get_value(iter->curr);
1136         } else
1137                 s = iter->get_value(iter->curr);
1138
1139         return s;
1140 }
1141
1142 /**
1143  * kmod_config_iter_next:
1144  * @iter: iterator over a certain configuration
1145  *
1146  * Make @iter point to the next item of a certain configuration. It's an
1147  * automatically recycling iterator. When it reaches the end, false is
1148  * returned; then if user wants to iterate again, it's sufficient to call this
1149  * function once more.
1150  *
1151  * Returns: true if next position of @iter is valid or false if its end is
1152  * reached.
1153  */
1154 KMOD_EXPORT bool kmod_config_iter_next(struct kmod_config_iter *iter)
1155 {
1156         if (iter == NULL)
1157                 return false;
1158
1159         if (iter->curr == NULL) {
1160                 iter->curr = iter->list;
1161                 return iter->curr != NULL;
1162         }
1163
1164         iter->curr = kmod_list_next(iter->list, iter->curr);
1165
1166         return iter->curr != NULL;
1167 }
1168
1169 /**
1170  * kmod_config_iter_free_iter:
1171  * @iter: iterator over a certain configuration
1172  *
1173  * Free resources used by the iterator.
1174  */
1175 KMOD_EXPORT void kmod_config_iter_free_iter(struct kmod_config_iter *iter)
1176 {
1177         free(iter->data);
1178         free(iter);
1179 }