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                 } else {
 492                         kmod_config_add_options(config, modname, param);
 493                 }
 494         }
 495 }
 496
 497 static int kmod_config_parse_kcmdline(struct kmod_config *config)
 498 {
 499         char buf[KCMD_LINE_SIZE];
 500         int fd, err;
 501         char *p, *modname,  *param = NULL, *value = NULL;
 502         bool is_quoted = false, is_module = true;
 503
 504         fd = open("/proc/cmdline", O_RDONLY|O_CLOEXEC);
 505         if (fd < 0) {
 506                 err = -errno;
 507                 DBG(config->ctx, "could not open '/proc/cmdline' for reading: %m\n");
 508                 return err;
 509         }
 510
 511         err = read_str_safe(fd, buf, sizeof(buf));
 512         close(fd);
 513         if (err < 0) {
 514                 ERR(config->ctx, "could not read from '/proc/cmdline': %s\n",
 515                                                         strerror(-err));
 516                 return err;
 517         }
 518
 519         for (p = buf, modname = buf; *p != '\0' && *p != '\n'; p++) {
 520                 if (*p == '"') {
 521                         is_quoted = !is_quoted;
 522
 523                         if (is_quoted) {
 524                                 /* don't consider a module until closing quotes */
 525                                 is_module = false;
 526                         } else if (param != NULL && value != NULL) {
 527                                 /*
 528                                  * If we are indeed expecting a value and
 529                                  * closing quotes, then this can be considered
 530                                  * a valid option for a module
 531                                  */
 532                                 is_module = true;
 533                         }
 534
 535                         continue;
 536                 }
 537                 if (is_quoted)
 538                         continue;
 539
 540                 switch (*p) {
 541                 case ' ':
 542                         *p = '\0';
 543                         if (is_module)
 544                                 kcmdline_parse_result(config, modname, param, value);
 545                         param = value = NULL;
 546                         modname = p + 1;
 547                         is_module = true;
 548                         break;
 549                 case '.':
 550                         if (param == NULL) {
 551                                 *p = '\0';
 552                                 param = p + 1;
 553                         }
 554                         break;
 555                 case '=':
 556                         if (param != NULL)
 557                                 value = p + 1;
 558                         else
 559                                 is_module = false;
 560                         break;
 561                 }
 562         }
 563
 564         *p = '\0';
 565         if (is_module)
 566                 kcmdline_parse_result(config, modname, param, value);
 567
 568         return 0;
 569 }
 570
 571 /*
 572  * Take an fd and own it. It will be closed on return. filename is used only
 573  * for debug messages
 574  */
 575 static int kmod_config_parse(struct kmod_config *config, int fd,
 576                                                         const char *filename)
 577 {
 578         struct kmod_ctx *ctx = config->ctx;
 579         char *line;
 580         FILE *fp;
 581         unsigned int linenum = 0;
 582         int err;
 583
 584         fp = fdopen(fd, "r");
 585         if (fp == NULL) {
 586                 err = -errno;
 587                 ERR(config->ctx, "fd %d: %m\n", fd);
 588                 close(fd);
 589                 return err;
 590         }
 591
 592         while ((line = freadline_wrapped(fp, &linenum)) != NULL) {
 593                 char *cmd, *saveptr;
 594
 595                 if (line[0] == '\0' || line[0] == '#')
 596                         goto done_next;
 597
 598                 cmd = strtok_r(line, "\t ", &saveptr);
 599                 if (cmd == NULL)
 600                         goto done_next;
 601
 602                 if (streq(cmd, "alias")) {
 603                         char *alias = strtok_r(NULL, "\t ", &saveptr);
 604                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 605
 606                         if (underscores(alias) < 0 || underscores(modname) < 0)
 607                                 goto syntax_error;
 608
 609                         kmod_config_add_alias(config, alias, modname);
 610                 } else if (streq(cmd, "blacklist")) {
 611                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 612
 613                         if (underscores(modname) < 0)
 614                                 goto syntax_error;
 615
 616                         kmod_config_add_blacklist(config, modname);
 617                 } else if (streq(cmd, "options")) {
 618                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 619                         char *options = strtok_r(NULL, "\0", &saveptr);
 620
 621                         if (underscores(modname) < 0 || options == NULL)
 622                                 goto syntax_error;
 623
 624                         kmod_config_add_options(config, modname, options);
 625                 } else if (streq(cmd, "install")) {
 626                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 627                         char *installcmd = strtok_r(NULL, "\0", &saveptr);
 628
 629                         if (underscores(modname) < 0 || installcmd == NULL)
 630                                 goto syntax_error;
 631
 632                         kmod_config_add_command(config, modname, installcmd,
 633                                         cmd, &config->install_commands);
 634                 } else if (streq(cmd, "remove")) {
 635                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 636                         char *removecmd = strtok_r(NULL, "\0", &saveptr);
 637
 638                         if (underscores(modname) < 0 || removecmd == NULL)
 639                                 goto syntax_error;
 640
 641                         kmod_config_add_command(config, modname, removecmd,
 642                                         cmd, &config->remove_commands);
 643                 } else if (streq(cmd, "softdep")) {
 644                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 645                         char *softdeps = strtok_r(NULL, "\0", &saveptr);
 646
 647                         if (underscores(modname) < 0 || softdeps == NULL)
 648                                 goto syntax_error;
 649
 650                         kmod_config_add_softdep(config, modname, softdeps);
 651                 } else if (streq(cmd, "include")
 652                                 || streq(cmd, "config")) {
 653                         ERR(ctx, "%s: command %s is deprecated and not parsed anymore\n",
 654                                                                 filename, cmd);
 655                 } else {
 656 syntax_error:
 657                         ERR(ctx, "%s line %u: ignoring bad line starting with '%s'\n",
 658                                                 filename, linenum, cmd);
 659                 }
 660
 661 done_next:
 662                 free(line);
 663         }
 664
 665         fclose(fp);
 666
 667         return 0;
 668 }
 669
 670 void kmod_config_free(struct kmod_config *config)
 671 {
 672         while (config->aliases)
 673                 kmod_config_free_alias(config, config->aliases);
 674
 675         while (config->blacklists)
 676                 kmod_config_free_blacklist(config, config->blacklists);
 677
 678         while (config->options)
 679                 kmod_config_free_options(config, config->options);
 680
 681         while (config->install_commands) {
 682                 kmod_config_free_command(config, config->install_commands,
 683                                                 &config->install_commands);
 684         }
 685
 686         while (config->remove_commands) {
 687                 kmod_config_free_command(config, config->remove_commands,
 688                                                 &config->remove_commands);
 689         }
 690
 691         while (config->softdeps)
 692                 kmod_config_free_softdep(config, config->softdeps);
 693
 694         for (; config->paths != NULL;
 695                                 config->paths = kmod_list_remove(config->paths))
 696                 free(config->paths->data);
 697
 698         free(config);
 699 }
 700
 701 static bool conf_files_filter_out(struct kmod_ctx *ctx, DIR *d,
 702                                         const char *path, const char *fn)
 703 {
 704         size_t len = strlen(fn);
 705         struct stat st;
 706
 707         if (fn[0] == '.')
 708                 return true;
 709
 710         if (len < 6 || (!streq(&fn[len - 5], ".conf")
 711                                 && !streq(&fn[len - 6], ".alias")))
 712                 return true;
 713
 714         fstatat(dirfd(d), fn, &st, 0);
 715
 716         if (S_ISDIR(st.st_mode)) {
 717                 ERR(ctx, "Directories inside directories are not supported: "
 718                                                         "%s/%s\n", path, fn);
 719                 return true;
 720         }
 721
 722         return false;
 723 }
 724
 725 struct conf_file {
 726         const char *path;
 727         bool is_single;
 728         char name[];
 729 };
 730
 731 static int conf_files_insert_sorted(struct kmod_ctx *ctx,
 732                                         struct kmod_list **list,
 733                                         const char *path, const char *name)
 734 {
 735         struct kmod_list *lpos, *tmp;
 736         struct conf_file *cf;
 737         size_t namelen;
 738         int cmp = -1;
 739         bool is_single = false;
 740
 741         if (name == NULL) {
 742                 name = basename(path);
 743                 is_single = true;
 744         }
 745
 746         kmod_list_foreach(lpos, *list) {
 747                 cf = lpos->data;
 748
 749                 if ((cmp = strcmp(name, cf->name)) <= 0)
 750                         break;
 751         }
 752
 753         if (cmp == 0) {
 754                 DBG(ctx, "Ignoring duplicate config file: %s/%s\n", path,
 755                                                                         name);
 756                 return -EEXIST;
 757         }
 758
 759         namelen = strlen(name);
 760         cf = malloc(sizeof(*cf) + namelen + 1);
 761         if (cf == NULL)
 762                 return -ENOMEM;
 763
 764         memcpy(cf->name, name, namelen + 1);
 765         cf->path = path;
 766         cf->is_single = is_single;
 767
 768         if (lpos == NULL)
 769                 tmp = kmod_list_append(*list, cf);
 770         else if (lpos == *list)
 771                 tmp = kmod_list_prepend(*list, cf);
 772         else
 773                 tmp = kmod_list_insert_before(lpos, cf);
 774
 775         if (tmp == NULL) {
 776                 free(cf);
 777                 return -ENOMEM;
 778         }
 779
 780         if (lpos == NULL || lpos == *list)
 781                 *list = tmp;
 782
 783         return 0;
 784 }
 785
 786 /*
 787  * Insert configuration files in @list, ignoring duplicates
 788  */
 789 static int conf_files_list(struct kmod_ctx *ctx, struct kmod_list **list,
 790                                                 const char *path,
 791                                                 unsigned long long *path_stamp)
 792 {
 793         DIR *d;
 794         int err;
 795         struct stat st;
 796         struct dirent *dent;
 797
 798         if (stat(path, &st) != 0) {
 799                 err = -errno;
 800                 DBG(ctx, "could not stat '%s': %m\n", path);
 801                 return err;
 802         }
 803
 804         *path_stamp = stat_mstamp(&st);
 805
 806         if (!S_ISDIR(st.st_mode)) {
 807                 conf_files_insert_sorted(ctx, list, path, NULL);
 808                 return 0;
 809         }
 810
 811         d = opendir(path);
 812         if (d == NULL) {
 813                 ERR(ctx, "opendir(%s): %m\n", path);
 814                 return -EINVAL;
 815         }
 816
 817         for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
 818                 if (conf_files_filter_out(ctx, d, path, dent->d_name))
 819                         continue;
 820
 821                 conf_files_insert_sorted(ctx, list, path, dent->d_name);
 822         }
 823
 824         closedir(d);
 825         return 0;
 826 }
 827
 828 int kmod_config_new(struct kmod_ctx *ctx, struct kmod_config **p_config,
 829                                         const char * const *config_paths)
 830 {
 831         struct kmod_config *config;
 832         struct kmod_list *list = NULL;
 833         struct kmod_list *path_list = NULL;
 834         size_t i;
 835
 836         conf_files_insert_sorted(ctx, &list, kmod_get_dirname(ctx), "modules.softdep");
 837
 838         for (i = 0; config_paths[i] != NULL; i++) {
 839                 const char *path = config_paths[i];
 840                 unsigned long long path_stamp = 0;
 841                 size_t pathlen;
 842                 struct kmod_list *tmp;
 843                 struct kmod_config_path *cf;
 844
 845                 if (conf_files_list(ctx, &list, path, &path_stamp) < 0)
 846                         continue;
 847
 848                 pathlen = strlen(path) + 1;
 849                 cf = malloc(sizeof(*cf) + pathlen);
 850                 if (cf == NULL)
 851                         goto oom;
 852
 853                 cf->stamp = path_stamp;
 854                 memcpy(cf->path, path, pathlen);
 855
 856                 tmp = kmod_list_append(path_list, cf);
 857                 if (tmp == NULL)
 858                         goto oom;
 859                 path_list = tmp;
 860         }
 861
 862         *p_config = config = calloc(1, sizeof(struct kmod_config));
 863         if (config == NULL)
 864                 goto oom;
 865
 866         config->paths = path_list;
 867         config->ctx = ctx;
 868
 869         for (; list != NULL; list = kmod_list_remove(list)) {
 870                 char buf[PATH_MAX];
 871                 const char *fn = buf;
 872                 struct conf_file *cf = list->data;
 873                 int fd;
 874
 875                 if (cf->is_single) {
 876                         fn = cf->path;
 877                 } else if (snprintf(buf, sizeof(buf), "%s/%s",
 878                                     cf->path, cf->name) >= (int)sizeof(buf)) {
 879                         ERR(ctx, "Error parsing %s/%s: path too long\n",
 880                             cf->path, cf->name);
 881                         free(cf);
 882                         continue;
 883                 }
 884
 885                 fd = open(fn, O_RDONLY|O_CLOEXEC);
 886                 DBG(ctx, "parsing file '%s' fd=%d\n", fn, fd);
 887
 888                 if (fd >= 0)
 889                         kmod_config_parse(config, fd, fn);
 890
 891                 free(cf);
 892         }
 893
 894         kmod_config_parse_kcmdline(config);
 895
 896         return 0;
 897
 898 oom:
 899         for (; list != NULL; list = kmod_list_remove(list))
 900                 free(list->data);
 901
 902         for (; path_list != NULL; path_list = kmod_list_remove(path_list))
 903                 free(path_list->data);
 904
 905         return -ENOMEM;
 906 }
 907
 908 /**********************************************************************
 909  * struct kmod_config_iter functions
 910  **********************************************************************/
 911
 912 enum config_type {
 913         CONFIG_TYPE_BLACKLIST = 0,
 914         CONFIG_TYPE_INSTALL,
 915         CONFIG_TYPE_REMOVE,
 916         CONFIG_TYPE_ALIAS,
 917         CONFIG_TYPE_OPTION,
 918         CONFIG_TYPE_SOFTDEP,
 919 };
 920
 921 struct kmod_config_iter {
 922         enum config_type type;
 923         bool intermediate;
 924         const struct kmod_list *list;
 925         const struct kmod_list *curr;
 926         void *data;
 927         const char *(*get_key)(const struct kmod_list *l);
 928         const char *(*get_value)(const struct kmod_list *l);
 929 };
 930
 931 static const char *softdep_get_plain_softdep(const struct kmod_list *l)
 932 {
 933         char *s = softdep_to_char(l->data);
 934         return s;
 935 }
 936
 937 static struct kmod_config_iter *kmod_config_iter_new(const struct kmod_ctx* ctx,
 938                                                         enum config_type type)
 939 {
 940         struct kmod_config_iter *iter = calloc(1, sizeof(*iter));
 941         const struct kmod_config *config = kmod_get_config(ctx);
 942
 943         if (iter == NULL)
 944                 return NULL;
 945
 946         iter->type = type;
 947
 948         switch (type) {
 949         case CONFIG_TYPE_BLACKLIST:
 950                 iter->list = config->blacklists;
 951                 iter->get_key = kmod_blacklist_get_modname;
 952                 break;
 953         case CONFIG_TYPE_INSTALL:
 954                 iter->list = config->install_commands;
 955                 iter->get_key = kmod_command_get_modname;
 956                 iter->get_value = kmod_command_get_command;
 957                 break;
 958         case CONFIG_TYPE_REMOVE:
 959                 iter->list = config->remove_commands;
 960                 iter->get_key = kmod_command_get_modname;
 961                 iter->get_value = kmod_command_get_command;
 962                 break;
 963         case CONFIG_TYPE_ALIAS:
 964                 iter->list = config->aliases;
 965                 iter->get_key = kmod_alias_get_name;
 966                 iter->get_value = kmod_alias_get_modname;
 967                 break;
 968         case CONFIG_TYPE_OPTION:
 969                 iter->list = config->options;
 970                 iter->get_key = kmod_option_get_modname;
 971                 iter->get_value = kmod_option_get_options;
 972                 break;
 973         case CONFIG_TYPE_SOFTDEP:
 974                 iter->list = config->softdeps;
 975                 iter->get_key = kmod_softdep_get_name;
 976                 iter->get_value = softdep_get_plain_softdep;
 977                 iter->intermediate = true;
 978                 break;
 979         }
 980
 981         return iter;
 982 }
 983
 984 /**
 985  * SECTION:libkmod-config
 986  * @short_description: retrieve current libkmod configuration
 987  */
 988
 989 /**
 990  * kmod_config_get_blacklists:
 991  * @ctx: kmod library context
 992  *
 993  * Retrieve an iterator to deal with the blacklist maintained inside the
 994  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
 995  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
 996  * be made to initialize the iterator and check if it's valid.
 997  *
 998  * Returns: a new iterator over the blacklists or NULL on failure. Free it
 999  * with kmod_config_iter_free_iter().
1000  */
1001 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_blacklists(const struct kmod_ctx *ctx)
1002 {
1003         if (ctx == NULL)
1004                 return NULL;;
1005
1006         return kmod_config_iter_new(ctx, CONFIG_TYPE_BLACKLIST);
1007 }
1008
1009 /**
1010  * kmod_config_get_install_commands:
1011  * @ctx: kmod library context
1012  *
1013  * Retrieve an iterator to deal with the install commands maintained inside the
1014  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1015  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1016  * be made to initialize the iterator and check if it's valid.
1017  *
1018  * Returns: a new iterator over the install commands or NULL on failure. Free
1019  * it with kmod_config_iter_free_iter().
1020  */
1021 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_install_commands(const struct kmod_ctx *ctx)
1022 {
1023         if (ctx == NULL)
1024                 return NULL;;
1025
1026         return kmod_config_iter_new(ctx, CONFIG_TYPE_INSTALL);
1027 }
1028
1029 /**
1030  * kmod_config_get_remove_commands:
1031  * @ctx: kmod library context
1032  *
1033  * Retrieve an iterator to deal with the remove commands maintained inside the
1034  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1035  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1036  * be made to initialize the iterator and check if it's valid.
1037  *
1038  * Returns: a new iterator over the remove commands or NULL on failure. Free
1039  * it with kmod_config_iter_free_iter().
1040  */
1041 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *ctx)
1042 {
1043         if (ctx == NULL)
1044                 return NULL;;
1045
1046         return kmod_config_iter_new(ctx, CONFIG_TYPE_REMOVE);
1047 }
1048
1049 /**
1050  * kmod_config_get_aliases:
1051  * @ctx: kmod library context
1052  *
1053  * Retrieve an iterator to deal with the aliases maintained inside the
1054  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1055  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1056  * be made to initialize the iterator and check if it's valid.
1057  *
1058  * Returns: a new iterator over the aliases or NULL on failure. Free it with
1059  * kmod_config_iter_free_iter().
1060  */
1061 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx)
1062 {
1063         if (ctx == NULL)
1064                 return NULL;;
1065
1066         return kmod_config_iter_new(ctx, CONFIG_TYPE_ALIAS);
1067 }
1068
1069 /**
1070  * kmod_config_get_options:
1071  * @ctx: kmod library context
1072  *
1073  * Retrieve an iterator to deal with the options maintained inside the
1074  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1075  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1076  * be made to initialize the iterator and check if it's valid.
1077  *
1078  * Returns: a new iterator over the options or NULL on failure. Free it with
1079  * kmod_config_iter_free_iter().
1080  */
1081 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx)
1082 {
1083         if (ctx == NULL)
1084                 return NULL;;
1085
1086         return kmod_config_iter_new(ctx, CONFIG_TYPE_OPTION);
1087 }
1088
1089 /**
1090  * kmod_config_get_softdeps:
1091  * @ctx: kmod library context
1092  *
1093  * Retrieve an iterator to deal with the softdeps maintained inside the
1094  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1095  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1096  * be made to initialize the iterator and check if it's valid.
1097  *
1098  * Returns: a new iterator over the softdeps or NULL on failure. Free it with
1099  * kmod_config_iter_free_iter().
1100  */
1101 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx)
1102 {
1103         if (ctx == NULL)
1104                 return NULL;;
1105
1106         return kmod_config_iter_new(ctx, CONFIG_TYPE_SOFTDEP);
1107 }
1108
1109 /**
1110  * kmod_config_iter_get_key:
1111  * @iter: iterator over a certain configuration
1112  *
1113  * When using a new allocated iterator, user must perform a call to
1114  * kmod_config_iter_next() to initialize iterator's position and check if it's
1115  * valid.
1116  *
1117  * Returns: the key of the current configuration pointed by @iter.
1118  */
1119 KMOD_EXPORT const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter)
1120 {
1121         if (iter == NULL || iter->curr == NULL)
1122                 return NULL;
1123
1124         return iter->get_key(iter->curr);
1125 }
1126
1127 /**
1128  * kmod_config_iter_get_value:
1129  * @iter: iterator over a certain configuration
1130  *
1131  * When using a new allocated iterator, user must perform a call to
1132  * kmod_config_iter_next() to initialize iterator's position and check if it's
1133  * valid.
1134  *
1135  * Returns: the value of the current configuration pointed by @iter.
1136  */
1137 KMOD_EXPORT const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter)
1138 {
1139         const char *s;
1140
1141         if (iter == NULL || iter->curr == NULL)
1142                 return NULL;
1143
1144         if (iter->get_value == NULL)
1145                 return NULL;
1146
1147         if (iter->intermediate) {
1148                 struct kmod_config_iter *i = (struct kmod_config_iter *)iter;
1149
1150                 free(i->data);
1151                 s = i->data = (void *) iter->get_value(iter->curr);
1152         } else
1153                 s = iter->get_value(iter->curr);
1154
1155         return s;
1156 }
1157
1158 /**
1159  * kmod_config_iter_next:
1160  * @iter: iterator over a certain configuration
1161  *
1162  * Make @iter point to the next item of a certain configuration. It's an
1163  * automatically recycling iterator. When it reaches the end, false is
1164  * returned; then if user wants to iterate again, it's sufficient to call this
1165  * function once more.
1166  *
1167  * Returns: true if next position of @iter is valid or false if its end is
1168  * reached.
1169  */
1170 KMOD_EXPORT bool kmod_config_iter_next(struct kmod_config_iter *iter)
1171 {
1172         if (iter == NULL)
1173                 return false;
1174
1175         if (iter->curr == NULL) {
1176                 iter->curr = iter->list;
1177                 return iter->curr != NULL;
1178         }
1179
1180         iter->curr = kmod_list_next(iter->list, iter->curr);
1181
1182         return iter->curr != NULL;
1183 }
1184
1185 /**
1186  * kmod_config_iter_free_iter:
1187  * @iter: iterator over a certain configuration
1188  *
1189  * Free resources used by the iterator.
1190  */
1191 KMOD_EXPORT void kmod_config_iter_free_iter(struct kmod_config_iter *iter)
1192 {
1193         free(iter->data);
1194         free(iter);
1195 }