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
 521                         if (is_quoted) {
 522                                 /* don't consider a module until closing quotes */
 523                                 is_module = false;
 524                         } else if (param != NULL && value != NULL) {
 525                                 /*
 526                                  * If we are indeed expecting a value and
 527                                  * closing quotes, then this can be considered
 528                                  * a valid option for a module
 529                                  */
 530                                 is_module = true;
 531                         }
 532
 533                         continue;
 534                 }
 535                 if (is_quoted)
 536                         continue;
 537
 538                 switch (*p) {
 539                 case ' ':
 540                         *p = '\0';
 541                         if (is_module)
 542                                 kcmdline_parse_result(config, modname, param, value);
 543                         param = value = NULL;
 544                         modname = p + 1;
 545                         is_module = true;
 546                         break;
 547                 case '.':
 548                         if (param == NULL) {
 549                                 *p = '\0';
 550                                 param = p + 1;
 551                         }
 552                         break;
 553                 case '=':
 554                         if (param != NULL)
 555                                 value = p + 1;
 556                         else
 557                                 is_module = false;
 558                         break;
 559                 }
 560         }
 561
 562         *p = '\0';
 563         if (is_module)
 564                 kcmdline_parse_result(config, modname, param, value);
 565
 566         return 0;
 567 }
 568
 569 /*
 570  * Take an fd and own it. It will be closed on return. filename is used only
 571  * for debug messages
 572  */
 573 static int kmod_config_parse(struct kmod_config *config, int fd,
 574                                                         const char *filename)
 575 {
 576         struct kmod_ctx *ctx = config->ctx;
 577         char *line;
 578         FILE *fp;
 579         unsigned int linenum = 0;
 580         int err;
 581
 582         fp = fdopen(fd, "r");
 583         if (fp == NULL) {
 584                 err = -errno;
 585                 ERR(config->ctx, "fd %d: %m\n", fd);
 586                 close(fd);
 587                 return err;
 588         }
 589
 590         while ((line = freadline_wrapped(fp, &linenum)) != NULL) {
 591                 char *cmd, *saveptr;
 592
 593                 if (line[0] == '\0' || line[0] == '#')
 594                         goto done_next;
 595
 596                 cmd = strtok_r(line, "\t ", &saveptr);
 597                 if (cmd == NULL)
 598                         goto done_next;
 599
 600                 if (streq(cmd, "alias")) {
 601                         char *alias = strtok_r(NULL, "\t ", &saveptr);
 602                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 603
 604                         if (underscores(alias) < 0 || underscores(modname) < 0)
 605                                 goto syntax_error;
 606
 607                         kmod_config_add_alias(config, alias, modname);
 608                 } else if (streq(cmd, "blacklist")) {
 609                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 610
 611                         if (underscores(modname) < 0)
 612                                 goto syntax_error;
 613
 614                         kmod_config_add_blacklist(config, modname);
 615                 } else if (streq(cmd, "options")) {
 616                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 617                         char *options = strtok_r(NULL, "\0", &saveptr);
 618
 619                         if (underscores(modname) < 0 || options == NULL)
 620                                 goto syntax_error;
 621
 622                         kmod_config_add_options(config, modname, options);
 623                 } else if (streq(cmd, "install")) {
 624                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 625                         char *installcmd = strtok_r(NULL, "\0", &saveptr);
 626
 627                         if (underscores(modname) < 0 || installcmd == NULL)
 628                                 goto syntax_error;
 629
 630                         kmod_config_add_command(config, modname, installcmd,
 631                                         cmd, &config->install_commands);
 632                 } else if (streq(cmd, "remove")) {
 633                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 634                         char *removecmd = strtok_r(NULL, "\0", &saveptr);
 635
 636                         if (underscores(modname) < 0 || removecmd == NULL)
 637                                 goto syntax_error;
 638
 639                         kmod_config_add_command(config, modname, removecmd,
 640                                         cmd, &config->remove_commands);
 641                 } else if (streq(cmd, "softdep")) {
 642                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 643                         char *softdeps = strtok_r(NULL, "\0", &saveptr);
 644
 645                         if (underscores(modname) < 0 || softdeps == NULL)
 646                                 goto syntax_error;
 647
 648                         kmod_config_add_softdep(config, modname, softdeps);
 649                 } else if (streq(cmd, "include")
 650                                 || streq(cmd, "config")) {
 651                         ERR(ctx, "%s: command %s is deprecated and not parsed anymore\n",
 652                                                                 filename, cmd);
 653                 } else {
 654 syntax_error:
 655                         ERR(ctx, "%s line %u: ignoring bad line starting with '%s'\n",
 656                                                 filename, linenum, cmd);
 657                 }
 658
 659 done_next:
 660                 free(line);
 661         }
 662
 663         fclose(fp);
 664
 665         return 0;
 666 }
 667
 668 void kmod_config_free(struct kmod_config *config)
 669 {
 670         while (config->aliases)
 671                 kmod_config_free_alias(config, config->aliases);
 672
 673         while (config->blacklists)
 674                 kmod_config_free_blacklist(config, config->blacklists);
 675
 676         while (config->options)
 677                 kmod_config_free_options(config, config->options);
 678
 679         while (config->install_commands) {
 680                 kmod_config_free_command(config, config->install_commands,
 681                                                 &config->install_commands);
 682         }
 683
 684         while (config->remove_commands) {
 685                 kmod_config_free_command(config, config->remove_commands,
 686                                                 &config->remove_commands);
 687         }
 688
 689         while (config->softdeps)
 690                 kmod_config_free_softdep(config, config->softdeps);
 691
 692         for (; config->paths != NULL;
 693                                 config->paths = kmod_list_remove(config->paths))
 694                 free(config->paths->data);
 695
 696         free(config);
 697 }
 698
 699 static bool conf_files_filter_out(struct kmod_ctx *ctx, DIR *d,
 700                                         const char *path, const char *fn)
 701 {
 702         size_t len = strlen(fn);
 703         struct stat st;
 704
 705         if (fn[0] == '.')
 706                 return true;
 707
 708         if (len < 6 || (!streq(&fn[len - 5], ".conf")
 709                                 && !streq(&fn[len - 6], ".alias")))
 710                 return true;
 711
 712         fstatat(dirfd(d), fn, &st, 0);
 713
 714         if (S_ISDIR(st.st_mode)) {
 715                 ERR(ctx, "Directories inside directories are not supported: "
 716                                                         "%s/%s\n", path, fn);
 717                 return true;
 718         }
 719
 720         return false;
 721 }
 722
 723 struct conf_file {
 724         const char *path;
 725         bool is_single;
 726         char name[];
 727 };
 728
 729 static int conf_files_insert_sorted(struct kmod_ctx *ctx,
 730                                         struct kmod_list **list,
 731                                         const char *path, const char *name)
 732 {
 733         struct kmod_list *lpos, *tmp;
 734         struct conf_file *cf;
 735         size_t namelen;
 736         int cmp = -1;
 737         bool is_single = false;
 738
 739         if (name == NULL) {
 740                 name = basename(path);
 741                 is_single = true;
 742         }
 743
 744         kmod_list_foreach(lpos, *list) {
 745                 cf = lpos->data;
 746
 747                 if ((cmp = strcmp(name, cf->name)) <= 0)
 748                         break;
 749         }
 750
 751         if (cmp == 0) {
 752                 DBG(ctx, "Ignoring duplicate config file: %s/%s\n", path,
 753                                                                         name);
 754                 return -EEXIST;
 755         }
 756
 757         namelen = strlen(name);
 758         cf = malloc(sizeof(*cf) + namelen + 1);
 759         if (cf == NULL)
 760                 return -ENOMEM;
 761
 762         memcpy(cf->name, name, namelen + 1);
 763         cf->path = path;
 764         cf->is_single = is_single;
 765
 766         if (lpos == NULL)
 767                 tmp = kmod_list_append(*list, cf);
 768         else if (lpos == *list)
 769                 tmp = kmod_list_prepend(*list, cf);
 770         else
 771                 tmp = kmod_list_insert_before(lpos, cf);
 772
 773         if (tmp == NULL) {
 774                 free(cf);
 775                 return -ENOMEM;
 776         }
 777
 778         if (lpos == NULL || lpos == *list)
 779                 *list = tmp;
 780
 781         return 0;
 782 }
 783
 784 /*
 785  * Insert configuration files in @list, ignoring duplicates
 786  */
 787 static int conf_files_list(struct kmod_ctx *ctx, struct kmod_list **list,
 788                                                 const char *path,
 789                                                 unsigned long long *path_stamp)
 790 {
 791         DIR *d;
 792         int err;
 793         struct stat st;
 794         struct dirent *dent;
 795
 796         if (stat(path, &st) != 0) {
 797                 err = -errno;
 798                 DBG(ctx, "could not stat '%s': %m\n", path);
 799                 return err;
 800         }
 801
 802         *path_stamp = stat_mstamp(&st);
 803
 804         if (!S_ISDIR(st.st_mode)) {
 805                 conf_files_insert_sorted(ctx, list, path, NULL);
 806                 return 0;
 807         }
 808
 809         d = opendir(path);
 810         if (d == NULL) {
 811                 ERR(ctx, "opendir(%s): %m\n", path);
 812                 return -EINVAL;
 813         }
 814
 815         for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
 816                 if (conf_files_filter_out(ctx, d, path, dent->d_name))
 817                         continue;
 818
 819                 conf_files_insert_sorted(ctx, list, path, dent->d_name);
 820         }
 821
 822         closedir(d);
 823         return 0;
 824 }
 825
 826 int kmod_config_new(struct kmod_ctx *ctx, struct kmod_config **p_config,
 827                                         const char * const *config_paths)
 828 {
 829         struct kmod_config *config;
 830         struct kmod_list *list = NULL;
 831         struct kmod_list *path_list = NULL;
 832         size_t i;
 833
 834         conf_files_insert_sorted(ctx, &list, kmod_get_dirname(ctx), "modules.softdep");
 835
 836         for (i = 0; config_paths[i] != NULL; i++) {
 837                 const char *path = config_paths[i];
 838                 unsigned long long path_stamp = 0;
 839                 size_t pathlen;
 840                 struct kmod_list *tmp;
 841                 struct kmod_config_path *cf;
 842
 843                 if (conf_files_list(ctx, &list, path, &path_stamp) < 0)
 844                         continue;
 845
 846                 pathlen = strlen(path) + 1;
 847                 cf = malloc(sizeof(*cf) + pathlen);
 848                 if (cf == NULL)
 849                         goto oom;
 850
 851                 cf->stamp = path_stamp;
 852                 memcpy(cf->path, path, pathlen);
 853
 854                 tmp = kmod_list_append(path_list, cf);
 855                 if (tmp == NULL)
 856                         goto oom;
 857                 path_list = tmp;
 858         }
 859
 860         *p_config = config = calloc(1, sizeof(struct kmod_config));
 861         if (config == NULL)
 862                 goto oom;
 863
 864         config->paths = path_list;
 865         config->ctx = ctx;
 866
 867         for (; list != NULL; list = kmod_list_remove(list)) {
 868                 char buf[PATH_MAX];
 869                 const char *fn = buf;
 870                 struct conf_file *cf = list->data;
 871                 int fd;
 872
 873                 if (cf->is_single) {
 874                         fn = cf->path;
 875                 } else if (snprintf(buf, sizeof(buf), "%s/%s",
 876                                     cf->path, cf->name) >= (int)sizeof(buf)) {
 877                         ERR(ctx, "Error parsing %s/%s: path too long\n",
 878                             cf->path, cf->name);
 879                         free(cf);
 880                         continue;
 881                 }
 882
 883                 fd = open(fn, O_RDONLY|O_CLOEXEC);
 884                 DBG(ctx, "parsing file '%s' fd=%d\n", fn, fd);
 885
 886                 if (fd >= 0)
 887                         kmod_config_parse(config, fd, fn);
 888
 889                 free(cf);
 890         }
 891
 892         kmod_config_parse_kcmdline(config);
 893
 894         return 0;
 895
 896 oom:
 897         for (; list != NULL; list = kmod_list_remove(list))
 898                 free(list->data);
 899
 900         for (; path_list != NULL; path_list = kmod_list_remove(path_list))
 901                 free(path_list->data);
 902
 903         return -ENOMEM;
 904 }
 905
 906 /**********************************************************************
 907  * struct kmod_config_iter functions
 908  **********************************************************************/
 909
 910 enum config_type {
 911         CONFIG_TYPE_BLACKLIST = 0,
 912         CONFIG_TYPE_INSTALL,
 913         CONFIG_TYPE_REMOVE,
 914         CONFIG_TYPE_ALIAS,
 915         CONFIG_TYPE_OPTION,
 916         CONFIG_TYPE_SOFTDEP,
 917 };
 918
 919 struct kmod_config_iter {
 920         enum config_type type;
 921         bool intermediate;
 922         const struct kmod_list *list;
 923         const struct kmod_list *curr;
 924         void *data;
 925         const char *(*get_key)(const struct kmod_list *l);
 926         const char *(*get_value)(const struct kmod_list *l);
 927 };
 928
 929 static const char *softdep_get_plain_softdep(const struct kmod_list *l)
 930 {
 931         char *s = softdep_to_char(l->data);
 932         return s;
 933 }
 934
 935 static struct kmod_config_iter *kmod_config_iter_new(const struct kmod_ctx* ctx,
 936                                                         enum config_type type)
 937 {
 938         struct kmod_config_iter *iter = calloc(1, sizeof(*iter));
 939         const struct kmod_config *config = kmod_get_config(ctx);
 940
 941         if (iter == NULL)
 942                 return NULL;
 943
 944         iter->type = type;
 945
 946         switch (type) {
 947         case CONFIG_TYPE_BLACKLIST:
 948                 iter->list = config->blacklists;
 949                 iter->get_key = kmod_blacklist_get_modname;
 950                 break;
 951         case CONFIG_TYPE_INSTALL:
 952                 iter->list = config->install_commands;
 953                 iter->get_key = kmod_command_get_modname;
 954                 iter->get_value = kmod_command_get_command;
 955                 break;
 956         case CONFIG_TYPE_REMOVE:
 957                 iter->list = config->remove_commands;
 958                 iter->get_key = kmod_command_get_modname;
 959                 iter->get_value = kmod_command_get_command;
 960                 break;
 961         case CONFIG_TYPE_ALIAS:
 962                 iter->list = config->aliases;
 963                 iter->get_key = kmod_alias_get_name;
 964                 iter->get_value = kmod_alias_get_modname;
 965                 break;
 966         case CONFIG_TYPE_OPTION:
 967                 iter->list = config->options;
 968                 iter->get_key = kmod_option_get_modname;
 969                 iter->get_value = kmod_option_get_options;
 970                 break;
 971         case CONFIG_TYPE_SOFTDEP:
 972                 iter->list = config->softdeps;
 973                 iter->get_key = kmod_softdep_get_name;
 974                 iter->get_value = softdep_get_plain_softdep;
 975                 iter->intermediate = true;
 976                 break;
 977         }
 978
 979         return iter;
 980 }
 981
 982 /**
 983  * SECTION:libkmod-config
 984  * @short_description: retrieve current libkmod configuration
 985  */
 986
 987 /**
 988  * kmod_config_get_blacklists:
 989  * @ctx: kmod library context
 990  *
 991  * Retrieve an iterator to deal with the blacklist maintained inside the
 992  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
 993  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
 994  * be made to initialize the iterator and check if it's valid.
 995  *
 996  * Returns: a new iterator over the blacklists or NULL on failure. Free it
 997  * with kmod_config_iter_free_iter().
 998  */
 999 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_blacklists(const struct kmod_ctx *ctx)
1000 {
1001         if (ctx == NULL)
1002                 return NULL;;
1003
1004         return kmod_config_iter_new(ctx, CONFIG_TYPE_BLACKLIST);
1005 }
1006
1007 /**
1008  * kmod_config_get_install_commands:
1009  * @ctx: kmod library context
1010  *
1011  * Retrieve an iterator to deal with the install commands maintained inside the
1012  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1013  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1014  * be made to initialize the iterator and check if it's valid.
1015  *
1016  * Returns: a new iterator over the install commands or NULL on failure. Free
1017  * it with kmod_config_iter_free_iter().
1018  */
1019 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_install_commands(const struct kmod_ctx *ctx)
1020 {
1021         if (ctx == NULL)
1022                 return NULL;;
1023
1024         return kmod_config_iter_new(ctx, CONFIG_TYPE_INSTALL);
1025 }
1026
1027 /**
1028  * kmod_config_get_remove_commands:
1029  * @ctx: kmod library context
1030  *
1031  * Retrieve an iterator to deal with the remove commands maintained inside the
1032  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1033  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1034  * be made to initialize the iterator and check if it's valid.
1035  *
1036  * Returns: a new iterator over the remove commands or NULL on failure. Free
1037  * it with kmod_config_iter_free_iter().
1038  */
1039 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *ctx)
1040 {
1041         if (ctx == NULL)
1042                 return NULL;;
1043
1044         return kmod_config_iter_new(ctx, CONFIG_TYPE_REMOVE);
1045 }
1046
1047 /**
1048  * kmod_config_get_aliases:
1049  * @ctx: kmod library context
1050  *
1051  * Retrieve an iterator to deal with the aliases maintained inside the
1052  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1053  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1054  * be made to initialize the iterator and check if it's valid.
1055  *
1056  * Returns: a new iterator over the aliases or NULL on failure. Free it with
1057  * kmod_config_iter_free_iter().
1058  */
1059 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx)
1060 {
1061         if (ctx == NULL)
1062                 return NULL;;
1063
1064         return kmod_config_iter_new(ctx, CONFIG_TYPE_ALIAS);
1065 }
1066
1067 /**
1068  * kmod_config_get_options:
1069  * @ctx: kmod library context
1070  *
1071  * Retrieve an iterator to deal with the options maintained inside the
1072  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1073  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1074  * be made to initialize the iterator and check if it's valid.
1075  *
1076  * Returns: a new iterator over the options or NULL on failure. Free it with
1077  * kmod_config_iter_free_iter().
1078  */
1079 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx)
1080 {
1081         if (ctx == NULL)
1082                 return NULL;;
1083
1084         return kmod_config_iter_new(ctx, CONFIG_TYPE_OPTION);
1085 }
1086
1087 /**
1088  * kmod_config_get_softdeps:
1089  * @ctx: kmod library context
1090  *
1091  * Retrieve an iterator to deal with the softdeps maintained inside the
1092  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1093  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1094  * be made to initialize the iterator and check if it's valid.
1095  *
1096  * Returns: a new iterator over the softdeps or NULL on failure. Free it with
1097  * kmod_config_iter_free_iter().
1098  */
1099 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx)
1100 {
1101         if (ctx == NULL)
1102                 return NULL;;
1103
1104         return kmod_config_iter_new(ctx, CONFIG_TYPE_SOFTDEP);
1105 }
1106
1107 /**
1108  * kmod_config_iter_get_key:
1109  * @iter: iterator over a certain configuration
1110  *
1111  * When using a new allocated iterator, user must perform a call to
1112  * kmod_config_iter_next() to initialize iterator's position and check if it's
1113  * valid.
1114  *
1115  * Returns: the key of the current configuration pointed by @iter.
1116  */
1117 KMOD_EXPORT const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter)
1118 {
1119         if (iter == NULL || iter->curr == NULL)
1120                 return NULL;
1121
1122         return iter->get_key(iter->curr);
1123 }
1124
1125 /**
1126  * kmod_config_iter_get_value:
1127  * @iter: iterator over a certain configuration
1128  *
1129  * When using a new allocated iterator, user must perform a call to
1130  * kmod_config_iter_next() to initialize iterator's position and check if it's
1131  * valid.
1132  *
1133  * Returns: the value of the current configuration pointed by @iter.
1134  */
1135 KMOD_EXPORT const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter)
1136 {
1137         const char *s;
1138
1139         if (iter == NULL || iter->curr == NULL)
1140                 return NULL;
1141
1142         if (iter->get_value == NULL)
1143                 return NULL;
1144
1145         if (iter->intermediate) {
1146                 struct kmod_config_iter *i = (struct kmod_config_iter *)iter;
1147
1148                 free(i->data);
1149                 s = i->data = (void *) iter->get_value(iter->curr);
1150         } else
1151                 s = iter->get_value(iter->curr);
1152
1153         return s;
1154 }
1155
1156 /**
1157  * kmod_config_iter_next:
1158  * @iter: iterator over a certain configuration
1159  *
1160  * Make @iter point to the next item of a certain configuration. It's an
1161  * automatically recycling iterator. When it reaches the end, false is
1162  * returned; then if user wants to iterate again, it's sufficient to call this
1163  * function once more.
1164  *
1165  * Returns: true if next position of @iter is valid or false if its end is
1166  * reached.
1167  */
1168 KMOD_EXPORT bool kmod_config_iter_next(struct kmod_config_iter *iter)
1169 {
1170         if (iter == NULL)
1171                 return false;
1172
1173         if (iter->curr == NULL) {
1174                 iter->curr = iter->list;
1175                 return iter->curr != NULL;
1176         }
1177
1178         iter->curr = kmod_list_next(iter->list, iter->curr);
1179
1180         return iter->curr != NULL;
1181 }
1182
1183 /**
1184  * kmod_config_iter_free_iter:
1185  * @iter: iterator over a certain configuration
1186  *
1187  * Free resources used by the iterator.
1188  */
1189 KMOD_EXPORT void kmod_config_iter_free_iter(struct kmod_config_iter *iter)
1190 {
1191         free(iter->data);
1192         free(iter);
1193 }