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         was_space = false;
 339         for (p = s = line; ; s++) {
 340                 size_t plen;
 341
 342                 if (*s != '\0') {
 343                         if (!isspace(*s)) {
 344                                 was_space = false;
 345                                 continue;
 346                         }
 347
 348                         if (was_space) {
 349                                 p = s + 1;
 350                                 continue;
 351                         }
 352                         was_space = true;
 353
 354                         if (p >= s)
 355                                 continue;
 356                 }
 357                 plen = s - p;
 358
 359                 if (plen == sizeof("pre:") - 1 &&
 360                                 memcmp(p, "pre:", sizeof("pre:") - 1) == 0)
 361                         mode = S_PRE;
 362                 else if (plen == sizeof("post:") - 1 &&
 363                                 memcmp(p, "post:", sizeof("post:") - 1) == 0)
 364                         mode = S_POST;
 365                 else if (*s != '\0' || (*s == '\0' && !was_space)) {
 366                         if (mode == S_PRE) {
 367                                 dep->pre[n_pre] = itr;
 368                                 memcpy(itr, p, plen);
 369                                 itr[plen] = '\0';
 370                                 itr += plen + 1;
 371                                 n_pre++;
 372                         } else if (mode == S_POST) {
 373                                 dep->post[n_post] = itr;
 374                                 memcpy(itr, p, plen);
 375                                 itr[plen] = '\0';
 376                                 itr += plen + 1;
 377                                 n_post++;
 378                         }
 379                 }
 380                 p = s + 1;
 381                 if (*s == '\0')
 382                         break;
 383         }
 384
 385         list = kmod_list_append(config->softdeps, dep);
 386         if (list == NULL) {
 387                 free(dep);
 388                 return -ENOMEM;
 389         }
 390         config->softdeps = list;
 391
 392         return 0;
 393 }
 394
 395 static char *softdep_to_char(struct kmod_softdep *dep) {
 396         const size_t sz_preprefix = sizeof("pre: ") - 1;
 397         const size_t sz_postprefix = sizeof("post: ") - 1;
 398         size_t sz = 1; /* at least '\0' */
 399         size_t sz_pre, sz_post;
 400         const char *start, *end;
 401         char *s, *itr;
 402
 403         /*
 404          * Rely on the fact that dep->pre[] and dep->post[] are strv's that
 405          * point to a contiguous buffer
 406          */
 407         if (dep->n_pre > 0) {
 408                 start = dep->pre[0];
 409                 end = dep->pre[dep->n_pre - 1]
 410                                         + strlen(dep->pre[dep->n_pre - 1]);
 411                 sz_pre = end - start;
 412                 sz += sz_pre + sz_preprefix;
 413         } else
 414                 sz_pre = 0;
 415
 416         if (dep->n_post > 0) {
 417                 start = dep->post[0];
 418                 end = dep->post[dep->n_post - 1]
 419                                         + strlen(dep->post[dep->n_post - 1]);
 420                 sz_post = end - start;
 421                 sz += sz_post + sz_postprefix;
 422         } else
 423                 sz_post = 0;
 424
 425         itr = s = malloc(sz);
 426         if (s == NULL)
 427                 return NULL;
 428
 429         if (sz_pre) {
 430                 char *p;
 431
 432                 memcpy(itr, "pre: ", sz_preprefix);
 433                 itr += sz_preprefix;
 434
 435                 /* include last '\0' */
 436                 memcpy(itr, dep->pre[0], sz_pre + 1);
 437                 for (p = itr; p < itr + sz_pre; p++) {
 438                         if (*p == '\0')
 439                                 *p = ' ';
 440                 }
 441                 itr = p;
 442         }
 443
 444         if (sz_post) {
 445                 char *p;
 446
 447                 memcpy(itr, "post: ", sz_postprefix);
 448                 itr += sz_postprefix;
 449
 450                 /* include last '\0' */
 451                 memcpy(itr, dep->post[0], sz_post + 1);
 452                 for (p = itr; p < itr + sz_post; p++) {
 453                         if (*p == '\0')
 454                                 *p = ' ';
 455                 }
 456                 itr = p;
 457         }
 458
 459         *itr = '\0';
 460
 461         return s;
 462 }
 463
 464 static void kmod_config_free_softdep(struct kmod_config *config,
 465                                                         struct kmod_list *l)
 466 {
 467         free(l->data);
 468         config->softdeps = kmod_list_remove(l);
 469 }
 470
 471 static void kcmdline_parse_result(struct kmod_config *config, char *modname,
 472                                                 char *param, char *value)
 473 {
 474         if (modname == NULL || param == NULL)
 475                 return;
 476
 477         DBG(config->ctx, "%s %s\n", modname, param);
 478
 479         if (streq(modname, "modprobe") && !strncmp(param, "blacklist=", 10)) {
 480                 for (;;) {
 481                         char *t = strsep(&value, ",");
 482                         if (t == NULL)
 483                                 break;
 484
 485                         kmod_config_add_blacklist(config, t);
 486                 }
 487         } else {
 488                 if (underscores(modname) < 0) {
 489                         ERR(config->ctx, "Ignoring bad option on kernel command line while parsing module name: '%s'\n",
 490                             modname);
 491                 }
 492                 kmod_config_add_options(config, modname, param);
 493         }
 494 }
 495
 496 static int kmod_config_parse_kcmdline(struct kmod_config *config)
 497 {
 498         char buf[KCMD_LINE_SIZE];
 499         int fd, err;
 500         char *p, *modname,  *param = NULL, *value = NULL;
 501         bool is_quoted = false, is_module = true;
 502
 503         fd = open("/proc/cmdline", O_RDONLY|O_CLOEXEC);
 504         if (fd < 0) {
 505                 err = -errno;
 506                 DBG(config->ctx, "could not open '/proc/cmdline' for reading: %m\n");
 507                 return err;
 508         }
 509
 510         err = read_str_safe(fd, buf, sizeof(buf));
 511         close(fd);
 512         if (err < 0) {
 513                 ERR(config->ctx, "could not read from '/proc/cmdline': %s\n",
 514                                                         strerror(-err));
 515                 return err;
 516         }
 517
 518         for (p = buf, modname = buf; *p != '\0' && *p != '\n'; p++) {
 519                 if (*p == '"') {
 520                         is_quoted = !is_quoted;
 521
 522                         if (is_quoted) {
 523                                 /* don't consider a module until closing quotes */
 524                                 is_module = false;
 525                         } else if (param != NULL && value != NULL) {
 526                                 /*
 527                                  * If we are indeed expecting a value and
 528                                  * closing quotes, then this can be considered
 529                                  * a valid option for a module
 530                                  */
 531                                 is_module = true;
 532                         }
 533
 534                         continue;
 535                 }
 536                 if (is_quoted)
 537                         continue;
 538
 539                 switch (*p) {
 540                 case ' ':
 541                         *p = '\0';
 542                         if (is_module)
 543                                 kcmdline_parse_result(config, modname, param, value);
 544                         param = value = NULL;
 545                         modname = p + 1;
 546                         is_module = true;
 547                         break;
 548                 case '.':
 549                         if (param == NULL) {
 550                                 *p = '\0';
 551                                 param = p + 1;
 552                         }
 553                         break;
 554                 case '=':
 555                         if (param != NULL)
 556                                 value = p + 1;
 557                         else
 558                                 is_module = false;
 559                         break;
 560                 }
 561         }
 562
 563         *p = '\0';
 564         if (is_module)
 565                 kcmdline_parse_result(config, modname, param, value);
 566
 567         return 0;
 568 }
 569
 570 /*
 571  * Take an fd and own it. It will be closed on return. filename is used only
 572  * for debug messages
 573  */
 574 static int kmod_config_parse(struct kmod_config *config, int fd,
 575                                                         const char *filename)
 576 {
 577         struct kmod_ctx *ctx = config->ctx;
 578         char *line;
 579         FILE *fp;
 580         unsigned int linenum = 0;
 581         int err;
 582
 583         fp = fdopen(fd, "r");
 584         if (fp == NULL) {
 585                 err = -errno;
 586                 ERR(config->ctx, "fd %d: %m\n", fd);
 587                 close(fd);
 588                 return err;
 589         }
 590
 591         while ((line = freadline_wrapped(fp, &linenum)) != NULL) {
 592                 char *cmd, *saveptr;
 593
 594                 if (line[0] == '\0' || line[0] == '#')
 595                         goto done_next;
 596
 597                 cmd = strtok_r(line, "\t ", &saveptr);
 598                 if (cmd == NULL)
 599                         goto done_next;
 600
 601                 if (streq(cmd, "alias")) {
 602                         char *alias = strtok_r(NULL, "\t ", &saveptr);
 603                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 604
 605                         if (underscores(alias) < 0 || underscores(modname) < 0)
 606                                 goto syntax_error;
 607
 608                         kmod_config_add_alias(config, alias, modname);
 609                 } else if (streq(cmd, "blacklist")) {
 610                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 611
 612                         if (underscores(modname) < 0)
 613                                 goto syntax_error;
 614
 615                         kmod_config_add_blacklist(config, modname);
 616                 } else if (streq(cmd, "options")) {
 617                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 618                         char *options = strtok_r(NULL, "\0", &saveptr);
 619
 620                         if (underscores(modname) < 0 || options == NULL)
 621                                 goto syntax_error;
 622
 623                         kmod_config_add_options(config, modname, options);
 624                 } else if (streq(cmd, "install")) {
 625                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 626                         char *installcmd = strtok_r(NULL, "\0", &saveptr);
 627
 628                         if (underscores(modname) < 0 || installcmd == NULL)
 629                                 goto syntax_error;
 630
 631                         kmod_config_add_command(config, modname, installcmd,
 632                                         cmd, &config->install_commands);
 633                 } else if (streq(cmd, "remove")) {
 634                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 635                         char *removecmd = strtok_r(NULL, "\0", &saveptr);
 636
 637                         if (underscores(modname) < 0 || removecmd == NULL)
 638                                 goto syntax_error;
 639
 640                         kmod_config_add_command(config, modname, removecmd,
 641                                         cmd, &config->remove_commands);
 642                 } else if (streq(cmd, "softdep")) {
 643                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 644                         char *softdeps = strtok_r(NULL, "\0", &saveptr);
 645
 646                         if (underscores(modname) < 0 || softdeps == NULL)
 647                                 goto syntax_error;
 648
 649                         kmod_config_add_softdep(config, modname, softdeps);
 650                 } else if (streq(cmd, "include")
 651                                 || streq(cmd, "config")) {
 652                         ERR(ctx, "%s: command %s is deprecated and not parsed anymore\n",
 653                                                                 filename, cmd);
 654                 } else {
 655 syntax_error:
 656                         ERR(ctx, "%s line %u: ignoring bad line starting with '%s'\n",
 657                                                 filename, linenum, cmd);
 658                 }
 659
 660 done_next:
 661                 free(line);
 662         }
 663
 664         fclose(fp);
 665
 666         return 0;
 667 }
 668
 669 void kmod_config_free(struct kmod_config *config)
 670 {
 671         while (config->aliases)
 672                 kmod_config_free_alias(config, config->aliases);
 673
 674         while (config->blacklists)
 675                 kmod_config_free_blacklist(config, config->blacklists);
 676
 677         while (config->options)
 678                 kmod_config_free_options(config, config->options);
 679
 680         while (config->install_commands) {
 681                 kmod_config_free_command(config, config->install_commands,
 682                                                 &config->install_commands);
 683         }
 684
 685         while (config->remove_commands) {
 686                 kmod_config_free_command(config, config->remove_commands,
 687                                                 &config->remove_commands);
 688         }
 689
 690         while (config->softdeps)
 691                 kmod_config_free_softdep(config, config->softdeps);
 692
 693         for (; config->paths != NULL;
 694                                 config->paths = kmod_list_remove(config->paths))
 695                 free(config->paths->data);
 696
 697         free(config);
 698 }
 699
 700 static bool conf_files_filter_out(struct kmod_ctx *ctx, DIR *d,
 701                                         const char *path, const char *fn)
 702 {
 703         size_t len = strlen(fn);
 704         struct stat st;
 705
 706         if (fn[0] == '.')
 707                 return true;
 708
 709         if (len < 6 || (!streq(&fn[len - 5], ".conf")
 710                                 && !streq(&fn[len - 6], ".alias")))
 711                 return true;
 712
 713         fstatat(dirfd(d), fn, &st, 0);
 714
 715         if (S_ISDIR(st.st_mode)) {
 716                 ERR(ctx, "Directories inside directories are not supported: "
 717                                                         "%s/%s\n", path, fn);
 718                 return true;
 719         }
 720
 721         return false;
 722 }
 723
 724 struct conf_file {
 725         const char *path;
 726         bool is_single;
 727         char name[];
 728 };
 729
 730 static int conf_files_insert_sorted(struct kmod_ctx *ctx,
 731                                         struct kmod_list **list,
 732                                         const char *path, const char *name)
 733 {
 734         struct kmod_list *lpos, *tmp;
 735         struct conf_file *cf;
 736         size_t namelen;
 737         int cmp = -1;
 738         bool is_single = false;
 739
 740         if (name == NULL) {
 741                 name = basename(path);
 742                 is_single = true;
 743         }
 744
 745         kmod_list_foreach(lpos, *list) {
 746                 cf = lpos->data;
 747
 748                 if ((cmp = strcmp(name, cf->name)) <= 0)
 749                         break;
 750         }
 751
 752         if (cmp == 0) {
 753                 DBG(ctx, "Ignoring duplicate config file: %s/%s\n", path,
 754                                                                         name);
 755                 return -EEXIST;
 756         }
 757
 758         namelen = strlen(name);
 759         cf = malloc(sizeof(*cf) + namelen + 1);
 760         if (cf == NULL)
 761                 return -ENOMEM;
 762
 763         memcpy(cf->name, name, namelen + 1);
 764         cf->path = path;
 765         cf->is_single = is_single;
 766
 767         if (lpos == NULL)
 768                 tmp = kmod_list_append(*list, cf);
 769         else if (lpos == *list)
 770                 tmp = kmod_list_prepend(*list, cf);
 771         else
 772                 tmp = kmod_list_insert_before(lpos, cf);
 773
 774         if (tmp == NULL) {
 775                 free(cf);
 776                 return -ENOMEM;
 777         }
 778
 779         if (lpos == NULL || lpos == *list)
 780                 *list = tmp;
 781
 782         return 0;
 783 }
 784
 785 /*
 786  * Insert configuration files in @list, ignoring duplicates
 787  */
 788 static int conf_files_list(struct kmod_ctx *ctx, struct kmod_list **list,
 789                                                 const char *path,
 790                                                 unsigned long long *path_stamp)
 791 {
 792         DIR *d;
 793         int err;
 794         struct stat st;
 795         struct dirent *dent;
 796
 797         if (stat(path, &st) != 0) {
 798                 err = -errno;
 799                 DBG(ctx, "could not stat '%s': %m\n", path);
 800                 return err;
 801         }
 802
 803         *path_stamp = stat_mstamp(&st);
 804
 805         if (!S_ISDIR(st.st_mode)) {
 806                 conf_files_insert_sorted(ctx, list, path, NULL);
 807                 return 0;
 808         }
 809
 810         d = opendir(path);
 811         if (d == NULL) {
 812                 ERR(ctx, "opendir(%s): %m\n", path);
 813                 return -EINVAL;
 814         }
 815
 816         for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
 817                 if (conf_files_filter_out(ctx, d, path, dent->d_name))
 818                         continue;
 819
 820                 conf_files_insert_sorted(ctx, list, path, dent->d_name);
 821         }
 822
 823         closedir(d);
 824         return 0;
 825 }
 826
 827 int kmod_config_new(struct kmod_ctx *ctx, struct kmod_config **p_config,
 828                                         const char * const *config_paths)
 829 {
 830         struct kmod_config *config;
 831         struct kmod_list *list = NULL;
 832         struct kmod_list *path_list = NULL;
 833         size_t i;
 834
 835         conf_files_insert_sorted(ctx, &list, kmod_get_dirname(ctx), "modules.softdep");
 836
 837         for (i = 0; config_paths[i] != NULL; i++) {
 838                 const char *path = config_paths[i];
 839                 unsigned long long path_stamp = 0;
 840                 size_t pathlen;
 841                 struct kmod_list *tmp;
 842                 struct kmod_config_path *cf;
 843
 844                 if (conf_files_list(ctx, &list, path, &path_stamp) < 0)
 845                         continue;
 846
 847                 pathlen = strlen(path) + 1;
 848                 cf = malloc(sizeof(*cf) + pathlen);
 849                 if (cf == NULL)
 850                         goto oom;
 851
 852                 cf->stamp = path_stamp;
 853                 memcpy(cf->path, path, pathlen);
 854
 855                 tmp = kmod_list_append(path_list, cf);
 856                 if (tmp == NULL)
 857                         goto oom;
 858                 path_list = tmp;
 859         }
 860
 861         *p_config = config = calloc(1, sizeof(struct kmod_config));
 862         if (config == NULL)
 863                 goto oom;
 864
 865         config->paths = path_list;
 866         config->ctx = ctx;
 867
 868         for (; list != NULL; list = kmod_list_remove(list)) {
 869                 char buf[PATH_MAX];
 870                 const char *fn = buf;
 871                 struct conf_file *cf = list->data;
 872                 int fd;
 873
 874                 if (cf->is_single) {
 875                         fn = cf->path;
 876                 } else if (snprintf(buf, sizeof(buf), "%s/%s",
 877                                     cf->path, cf->name) >= (int)sizeof(buf)) {
 878                         ERR(ctx, "Error parsing %s/%s: path too long\n",
 879                             cf->path, cf->name);
 880                         free(cf);
 881                         continue;
 882                 }
 883
 884                 fd = open(fn, O_RDONLY|O_CLOEXEC);
 885                 DBG(ctx, "parsing file '%s' fd=%d\n", fn, fd);
 886
 887                 if (fd >= 0)
 888                         kmod_config_parse(config, fd, fn);
 889
 890                 free(cf);
 891         }
 892
 893         kmod_config_parse_kcmdline(config);
 894
 895         return 0;
 896
 897 oom:
 898         for (; list != NULL; list = kmod_list_remove(list))
 899                 free(list->data);
 900
 901         for (; path_list != NULL; path_list = kmod_list_remove(path_list))
 902                 free(path_list->data);
 903
 904         return -ENOMEM;
 905 }
 906
 907 /**********************************************************************
 908  * struct kmod_config_iter functions
 909  **********************************************************************/
 910
 911 enum config_type {
 912         CONFIG_TYPE_BLACKLIST = 0,
 913         CONFIG_TYPE_INSTALL,
 914         CONFIG_TYPE_REMOVE,
 915         CONFIG_TYPE_ALIAS,
 916         CONFIG_TYPE_OPTION,
 917         CONFIG_TYPE_SOFTDEP,
 918 };
 919
 920 struct kmod_config_iter {
 921         enum config_type type;
 922         bool intermediate;
 923         const struct kmod_list *list;
 924         const struct kmod_list *curr;
 925         void *data;
 926         const char *(*get_key)(const struct kmod_list *l);
 927         const char *(*get_value)(const struct kmod_list *l);
 928 };
 929
 930 static const char *softdep_get_plain_softdep(const struct kmod_list *l)
 931 {
 932         char *s = softdep_to_char(l->data);
 933         return s;
 934 }
 935
 936 static struct kmod_config_iter *kmod_config_iter_new(const struct kmod_ctx* ctx,
 937                                                         enum config_type type)
 938 {
 939         struct kmod_config_iter *iter = calloc(1, sizeof(*iter));
 940         const struct kmod_config *config = kmod_get_config(ctx);
 941
 942         if (iter == NULL)
 943                 return NULL;
 944
 945         iter->type = type;
 946
 947         switch (type) {
 948         case CONFIG_TYPE_BLACKLIST:
 949                 iter->list = config->blacklists;
 950                 iter->get_key = kmod_blacklist_get_modname;
 951                 break;
 952         case CONFIG_TYPE_INSTALL:
 953                 iter->list = config->install_commands;
 954                 iter->get_key = kmod_command_get_modname;
 955                 iter->get_value = kmod_command_get_command;
 956                 break;
 957         case CONFIG_TYPE_REMOVE:
 958                 iter->list = config->remove_commands;
 959                 iter->get_key = kmod_command_get_modname;
 960                 iter->get_value = kmod_command_get_command;
 961                 break;
 962         case CONFIG_TYPE_ALIAS:
 963                 iter->list = config->aliases;
 964                 iter->get_key = kmod_alias_get_name;
 965                 iter->get_value = kmod_alias_get_modname;
 966                 break;
 967         case CONFIG_TYPE_OPTION:
 968                 iter->list = config->options;
 969                 iter->get_key = kmod_option_get_modname;
 970                 iter->get_value = kmod_option_get_options;
 971                 break;
 972         case CONFIG_TYPE_SOFTDEP:
 973                 iter->list = config->softdeps;
 974                 iter->get_key = kmod_softdep_get_name;
 975                 iter->get_value = softdep_get_plain_softdep;
 976                 iter->intermediate = true;
 977                 break;
 978         }
 979
 980         return iter;
 981 }
 982
 983 /**
 984  * SECTION:libkmod-config
 985  * @short_description: retrieve current libkmod configuration
 986  */
 987
 988 /**
 989  * kmod_config_get_blacklists:
 990  * @ctx: kmod library context
 991  *
 992  * Retrieve an iterator to deal with the blacklist maintained inside the
 993  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
 994  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
 995  * be made to initialize the iterator and check if it's valid.
 996  *
 997  * Returns: a new iterator over the blacklists or NULL on failure. Free it
 998  * with kmod_config_iter_free_iter().
 999  */
1000 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_blacklists(const struct kmod_ctx *ctx)
1001 {
1002         if (ctx == NULL)
1003                 return NULL;;
1004
1005         return kmod_config_iter_new(ctx, CONFIG_TYPE_BLACKLIST);
1006 }
1007
1008 /**
1009  * kmod_config_get_install_commands:
1010  * @ctx: kmod library context
1011  *
1012  * Retrieve an iterator to deal with the install commands maintained inside the
1013  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1014  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1015  * be made to initialize the iterator and check if it's valid.
1016  *
1017  * Returns: a new iterator over the install commands or NULL on failure. Free
1018  * it with kmod_config_iter_free_iter().
1019  */
1020 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_install_commands(const struct kmod_ctx *ctx)
1021 {
1022         if (ctx == NULL)
1023                 return NULL;;
1024
1025         return kmod_config_iter_new(ctx, CONFIG_TYPE_INSTALL);
1026 }
1027
1028 /**
1029  * kmod_config_get_remove_commands:
1030  * @ctx: kmod library context
1031  *
1032  * Retrieve an iterator to deal with the remove commands maintained inside the
1033  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1034  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1035  * be made to initialize the iterator and check if it's valid.
1036  *
1037  * Returns: a new iterator over the remove commands or NULL on failure. Free
1038  * it with kmod_config_iter_free_iter().
1039  */
1040 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *ctx)
1041 {
1042         if (ctx == NULL)
1043                 return NULL;;
1044
1045         return kmod_config_iter_new(ctx, CONFIG_TYPE_REMOVE);
1046 }
1047
1048 /**
1049  * kmod_config_get_aliases:
1050  * @ctx: kmod library context
1051  *
1052  * Retrieve an iterator to deal with the aliases maintained inside the
1053  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1054  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1055  * be made to initialize the iterator and check if it's valid.
1056  *
1057  * Returns: a new iterator over the aliases or NULL on failure. Free it with
1058  * kmod_config_iter_free_iter().
1059  */
1060 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx)
1061 {
1062         if (ctx == NULL)
1063                 return NULL;;
1064
1065         return kmod_config_iter_new(ctx, CONFIG_TYPE_ALIAS);
1066 }
1067
1068 /**
1069  * kmod_config_get_options:
1070  * @ctx: kmod library context
1071  *
1072  * Retrieve an iterator to deal with the options maintained inside the
1073  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1074  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1075  * be made to initialize the iterator and check if it's valid.
1076  *
1077  * Returns: a new iterator over the options or NULL on failure. Free it with
1078  * kmod_config_iter_free_iter().
1079  */
1080 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx)
1081 {
1082         if (ctx == NULL)
1083                 return NULL;;
1084
1085         return kmod_config_iter_new(ctx, CONFIG_TYPE_OPTION);
1086 }
1087
1088 /**
1089  * kmod_config_get_softdeps:
1090  * @ctx: kmod library context
1091  *
1092  * Retrieve an iterator to deal with the softdeps maintained inside the
1093  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1094  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1095  * be made to initialize the iterator and check if it's valid.
1096  *
1097  * Returns: a new iterator over the softdeps or NULL on failure. Free it with
1098  * kmod_config_iter_free_iter().
1099  */
1100 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx)
1101 {
1102         if (ctx == NULL)
1103                 return NULL;;
1104
1105         return kmod_config_iter_new(ctx, CONFIG_TYPE_SOFTDEP);
1106 }
1107
1108 /**
1109  * kmod_config_iter_get_key:
1110  * @iter: iterator over a certain configuration
1111  *
1112  * When using a new allocated iterator, user must perform a call to
1113  * kmod_config_iter_next() to initialize iterator's position and check if it's
1114  * valid.
1115  *
1116  * Returns: the key of the current configuration pointed by @iter.
1117  */
1118 KMOD_EXPORT const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter)
1119 {
1120         if (iter == NULL || iter->curr == NULL)
1121                 return NULL;
1122
1123         return iter->get_key(iter->curr);
1124 }
1125
1126 /**
1127  * kmod_config_iter_get_value:
1128  * @iter: iterator over a certain configuration
1129  *
1130  * When using a new allocated iterator, user must perform a call to
1131  * kmod_config_iter_next() to initialize iterator's position and check if it's
1132  * valid.
1133  *
1134  * Returns: the value of the current configuration pointed by @iter.
1135  */
1136 KMOD_EXPORT const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter)
1137 {
1138         const char *s;
1139
1140         if (iter == NULL || iter->curr == NULL)
1141                 return NULL;
1142
1143         if (iter->get_value == NULL)
1144                 return NULL;
1145
1146         if (iter->intermediate) {
1147                 struct kmod_config_iter *i = (struct kmod_config_iter *)iter;
1148
1149                 free(i->data);
1150                 s = i->data = (void *) iter->get_value(iter->curr);
1151         } else
1152                 s = iter->get_value(iter->curr);
1153
1154         return s;
1155 }
1156
1157 /**
1158  * kmod_config_iter_next:
1159  * @iter: iterator over a certain configuration
1160  *
1161  * Make @iter point to the next item of a certain configuration. It's an
1162  * automatically recycling iterator. When it reaches the end, false is
1163  * returned; then if user wants to iterate again, it's sufficient to call this
1164  * function once more.
1165  *
1166  * Returns: true if next position of @iter is valid or false if its end is
1167  * reached.
1168  */
1169 KMOD_EXPORT bool kmod_config_iter_next(struct kmod_config_iter *iter)
1170 {
1171         if (iter == NULL)
1172                 return false;
1173
1174         if (iter->curr == NULL) {
1175                 iter->curr = iter->list;
1176                 return iter->curr != NULL;
1177         }
1178
1179         iter->curr = kmod_list_next(iter->list, iter->curr);
1180
1181         return iter->curr != NULL;
1182 }
1183
1184 /**
1185  * kmod_config_iter_free_iter:
1186  * @iter: iterator over a certain configuration
1187  *
1188  * Free resources used by the iterator.
1189  */
1190 KMOD_EXPORT void kmod_config_iter_free_iter(struct kmod_config_iter *iter)
1191 {
1192         free(iter->data);
1193         free(iter);
1194 }