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, *p_quote_start, *modname,  *param = NULL, *value = NULL;
 502         bool is_quoted = false, iter = true;
 503         enum state {
 504                 STATE_IGNORE,
 505                 STATE_MODNAME,
 506                 STATE_PARAM,
 507                 STATE_VALUE,
 508                 STATE_COMPLETE,
 509         } state;
 510
 511         fd = open("/proc/cmdline", O_RDONLY|O_CLOEXEC);
 512         if (fd < 0) {
 513                 err = -errno;
 514                 DBG(config->ctx, "could not open '/proc/cmdline' for reading: %m\n");
 515                 return err;
 516         }
 517
 518         err = read_str_safe(fd, buf, sizeof(buf));
 519         close(fd);
 520         if (err < 0) {
 521                 ERR(config->ctx, "could not read from '/proc/cmdline': %s\n",
 522                                                         strerror(-err));
 523                 return err;
 524         }
 525
 526         state = STATE_MODNAME;
 527         p_quote_start = NULL;
 528         for (p = buf, modname = buf; iter; p++) {
 529                 switch (*p) {
 530                 case '"':
 531                         is_quoted = !is_quoted;
 532
 533                         /*
 534                          * only allow starting quote as first char when looking
 535                          * for a modname: anything else is considered ill-formed
 536                          */
 537                         if (is_quoted && state == STATE_MODNAME && p == modname) {
 538                                 p_quote_start = p;
 539                                 modname = p + 1;
 540                         } else if (state != STATE_VALUE) {
 541                                 state = STATE_IGNORE;
 542                         }
 543
 544                         break;
 545                 case '\0':
 546                 case '\n':
 547                         /* Stop iterating on new chars */
 548                         iter = false;
 549                         /* fall-through */
 550                 case ' ':
 551                         if (is_quoted && state == STATE_VALUE) {
 552                                 /* no state change*/;
 553                         } else if (is_quoted) {
 554                                 /* spaces are only allowed in the value part */
 555                                 state = STATE_IGNORE;
 556                         } else if (state == STATE_VALUE || state == STATE_PARAM) {
 557                                 *p = '\0';
 558                                 state = STATE_COMPLETE;
 559                         } else {
 560                                 /*
 561                                  * go to next option, ignoring any possible
 562                                  * partial match we have
 563                                  */
 564                                 modname = p + 1;
 565                                 state = STATE_MODNAME;
 566                                 p_quote_start = NULL;
 567                         }
 568                         break;
 569                 case '.':
 570                         if (state == STATE_MODNAME) {
 571                                 *p = '\0';
 572                                 param = p + 1;
 573                                 state = STATE_PARAM;
 574                         } else if (state == STATE_PARAM) {
 575                                 state = STATE_IGNORE;
 576                         }
 577                         break;
 578                 case '=':
 579                         if (state == STATE_PARAM) {
 580                                 /*
 581                                  * Don't set *p to '\0': the value var shadows
 582                                  * param
 583                                  */
 584                                 value = p + 1;
 585                                 state = STATE_VALUE;
 586                         } else if (state == STATE_MODNAME) {
 587                                 state = STATE_IGNORE;
 588                         }
 589                         break;
 590                 }
 591
 592                 if (state == STATE_COMPLETE) {
 593                         /*
 594                          * We may need to re-quote to unmangle what the
 595                          * bootloader passed. Example: grub passes the option as
 596                          * "parport.dyndbg=file drivers/parport/ieee1284_ops.c +mpf"
 597                          * instead of
 598                          * parport.dyndbg="file drivers/parport/ieee1284_ops.c +mpf"
 599                          */
 600                         if (p_quote_start && p_quote_start < modname) {
 601                                 /*
 602                                  * p_quote_start
 603                                  * |
 604                                  * |modname  param  value
 605                                  * ||        |      |
 606                                  * vv        v      v
 607                                  * "parport\0dyndbg=file drivers/parport/ieee1284_ops.c +mpf" */
 608                                 memmove(p_quote_start, modname, value - modname);
 609                                 value--; modname--; param--;
 610                                 *value = '"';
 611                         }
 612                         kcmdline_parse_result(config, modname, param, value);
 613                         /* start over on next iteration */
 614                         modname = p + 1;
 615                         state = STATE_MODNAME;
 616                         p_quote_start = NULL;
 617                 }
 618         }
 619
 620         return 0;
 621 }
 622
 623 /*
 624  * Take an fd and own it. It will be closed on return. filename is used only
 625  * for debug messages
 626  */
 627 static int kmod_config_parse(struct kmod_config *config, int fd,
 628                                                         const char *filename)
 629 {
 630         struct kmod_ctx *ctx = config->ctx;
 631         char *line;
 632         FILE *fp;
 633         unsigned int linenum = 0;
 634         int err;
 635
 636         fp = fdopen(fd, "r");
 637         if (fp == NULL) {
 638                 err = -errno;
 639                 ERR(config->ctx, "fd %d: %m\n", fd);
 640                 close(fd);
 641                 return err;
 642         }
 643
 644         while ((line = freadline_wrapped(fp, &linenum)) != NULL) {
 645                 char *cmd, *saveptr;
 646
 647                 if (line[0] == '\0' || line[0] == '#')
 648                         goto done_next;
 649
 650                 cmd = strtok_r(line, "\t ", &saveptr);
 651                 if (cmd == NULL)
 652                         goto done_next;
 653
 654                 if (streq(cmd, "alias")) {
 655                         char *alias = strtok_r(NULL, "\t ", &saveptr);
 656                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 657
 658                         if (underscores(alias) < 0 || underscores(modname) < 0)
 659                                 goto syntax_error;
 660
 661                         kmod_config_add_alias(config, alias, modname);
 662                 } else if (streq(cmd, "blacklist")) {
 663                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 664
 665                         if (underscores(modname) < 0)
 666                                 goto syntax_error;
 667
 668                         kmod_config_add_blacklist(config, modname);
 669                 } else if (streq(cmd, "options")) {
 670                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 671                         char *options = strtok_r(NULL, "\0", &saveptr);
 672
 673                         if (underscores(modname) < 0 || options == NULL)
 674                                 goto syntax_error;
 675
 676                         kmod_config_add_options(config, modname, options);
 677                 } else if (streq(cmd, "install")) {
 678                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 679                         char *installcmd = strtok_r(NULL, "\0", &saveptr);
 680
 681                         if (underscores(modname) < 0 || installcmd == NULL)
 682                                 goto syntax_error;
 683
 684                         kmod_config_add_command(config, modname, installcmd,
 685                                         cmd, &config->install_commands);
 686                 } else if (streq(cmd, "remove")) {
 687                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 688                         char *removecmd = strtok_r(NULL, "\0", &saveptr);
 689
 690                         if (underscores(modname) < 0 || removecmd == NULL)
 691                                 goto syntax_error;
 692
 693                         kmod_config_add_command(config, modname, removecmd,
 694                                         cmd, &config->remove_commands);
 695                 } else if (streq(cmd, "softdep")) {
 696                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 697                         char *softdeps = strtok_r(NULL, "\0", &saveptr);
 698
 699                         if (underscores(modname) < 0 || softdeps == NULL)
 700                                 goto syntax_error;
 701
 702                         kmod_config_add_softdep(config, modname, softdeps);
 703                 } else if (streq(cmd, "include")
 704                                 || streq(cmd, "config")) {
 705                         ERR(ctx, "%s: command %s is deprecated and not parsed anymore\n",
 706                                                                 filename, cmd);
 707                 } else {
 708 syntax_error:
 709                         ERR(ctx, "%s line %u: ignoring bad line starting with '%s'\n",
 710                                                 filename, linenum, cmd);
 711                 }
 712
 713 done_next:
 714                 free(line);
 715         }
 716
 717         fclose(fp);
 718
 719         return 0;
 720 }
 721
 722 void kmod_config_free(struct kmod_config *config)
 723 {
 724         while (config->aliases)
 725                 kmod_config_free_alias(config, config->aliases);
 726
 727         while (config->blacklists)
 728                 kmod_config_free_blacklist(config, config->blacklists);
 729
 730         while (config->options)
 731                 kmod_config_free_options(config, config->options);
 732
 733         while (config->install_commands) {
 734                 kmod_config_free_command(config, config->install_commands,
 735                                                 &config->install_commands);
 736         }
 737
 738         while (config->remove_commands) {
 739                 kmod_config_free_command(config, config->remove_commands,
 740                                                 &config->remove_commands);
 741         }
 742
 743         while (config->softdeps)
 744                 kmod_config_free_softdep(config, config->softdeps);
 745
 746         for (; config->paths != NULL;
 747                                 config->paths = kmod_list_remove(config->paths))
 748                 free(config->paths->data);
 749
 750         free(config);
 751 }
 752
 753 static bool conf_files_filter_out(struct kmod_ctx *ctx, DIR *d,
 754                                         const char *path, const char *fn)
 755 {
 756         size_t len = strlen(fn);
 757         struct stat st;
 758
 759         if (fn[0] == '.')
 760                 return true;
 761
 762         if (len < 6 || (!streq(&fn[len - 5], ".conf")
 763                                 && !streq(&fn[len - 6], ".alias")))
 764                 return true;
 765
 766         fstatat(dirfd(d), fn, &st, 0);
 767
 768         if (S_ISDIR(st.st_mode)) {
 769                 ERR(ctx, "Directories inside directories are not supported: "
 770                                                         "%s/%s\n", path, fn);
 771                 return true;
 772         }
 773
 774         return false;
 775 }
 776
 777 struct conf_file {
 778         const char *path;
 779         bool is_single;
 780         char name[];
 781 };
 782
 783 static int conf_files_insert_sorted(struct kmod_ctx *ctx,
 784                                         struct kmod_list **list,
 785                                         const char *path, const char *name)
 786 {
 787         struct kmod_list *lpos, *tmp;
 788         struct conf_file *cf;
 789         size_t namelen;
 790         int cmp = -1;
 791         bool is_single = false;
 792
 793         if (name == NULL) {
 794                 name = basename(path);
 795                 is_single = true;
 796         }
 797
 798         kmod_list_foreach(lpos, *list) {
 799                 cf = lpos->data;
 800
 801                 if ((cmp = strcmp(name, cf->name)) <= 0)
 802                         break;
 803         }
 804
 805         if (cmp == 0) {
 806                 DBG(ctx, "Ignoring duplicate config file: %s/%s\n", path,
 807                                                                         name);
 808                 return -EEXIST;
 809         }
 810
 811         namelen = strlen(name);
 812         cf = malloc(sizeof(*cf) + namelen + 1);
 813         if (cf == NULL)
 814                 return -ENOMEM;
 815
 816         memcpy(cf->name, name, namelen + 1);
 817         cf->path = path;
 818         cf->is_single = is_single;
 819
 820         if (lpos == NULL)
 821                 tmp = kmod_list_append(*list, cf);
 822         else if (lpos == *list)
 823                 tmp = kmod_list_prepend(*list, cf);
 824         else
 825                 tmp = kmod_list_insert_before(lpos, cf);
 826
 827         if (tmp == NULL) {
 828                 free(cf);
 829                 return -ENOMEM;
 830         }
 831
 832         if (lpos == NULL || lpos == *list)
 833                 *list = tmp;
 834
 835         return 0;
 836 }
 837
 838 /*
 839  * Insert configuration files in @list, ignoring duplicates
 840  */
 841 static int conf_files_list(struct kmod_ctx *ctx, struct kmod_list **list,
 842                                                 const char *path,
 843                                                 unsigned long long *path_stamp)
 844 {
 845         DIR *d;
 846         int err;
 847         struct stat st;
 848         struct dirent *dent;
 849
 850         if (stat(path, &st) != 0) {
 851                 err = -errno;
 852                 DBG(ctx, "could not stat '%s': %m\n", path);
 853                 return err;
 854         }
 855
 856         *path_stamp = stat_mstamp(&st);
 857
 858         if (!S_ISDIR(st.st_mode)) {
 859                 conf_files_insert_sorted(ctx, list, path, NULL);
 860                 return 0;
 861         }
 862
 863         d = opendir(path);
 864         if (d == NULL) {
 865                 ERR(ctx, "opendir(%s): %m\n", path);
 866                 return -EINVAL;
 867         }
 868
 869         for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
 870                 if (conf_files_filter_out(ctx, d, path, dent->d_name))
 871                         continue;
 872
 873                 conf_files_insert_sorted(ctx, list, path, dent->d_name);
 874         }
 875
 876         closedir(d);
 877         return 0;
 878 }
 879
 880 int kmod_config_new(struct kmod_ctx *ctx, struct kmod_config **p_config,
 881                                         const char * const *config_paths)
 882 {
 883         struct kmod_config *config;
 884         struct kmod_list *list = NULL;
 885         struct kmod_list *path_list = NULL;
 886         size_t i;
 887
 888         conf_files_insert_sorted(ctx, &list, kmod_get_dirname(ctx), "modules.softdep");
 889
 890         for (i = 0; config_paths[i] != NULL; i++) {
 891                 const char *path = config_paths[i];
 892                 unsigned long long path_stamp = 0;
 893                 size_t pathlen;
 894                 struct kmod_list *tmp;
 895                 struct kmod_config_path *cf;
 896
 897                 if (conf_files_list(ctx, &list, path, &path_stamp) < 0)
 898                         continue;
 899
 900                 pathlen = strlen(path) + 1;
 901                 cf = malloc(sizeof(*cf) + pathlen);
 902                 if (cf == NULL)
 903                         goto oom;
 904
 905                 cf->stamp = path_stamp;
 906                 memcpy(cf->path, path, pathlen);
 907
 908                 tmp = kmod_list_append(path_list, cf);
 909                 if (tmp == NULL)
 910                         goto oom;
 911                 path_list = tmp;
 912         }
 913
 914         *p_config = config = calloc(1, sizeof(struct kmod_config));
 915         if (config == NULL)
 916                 goto oom;
 917
 918         config->paths = path_list;
 919         config->ctx = ctx;
 920
 921         for (; list != NULL; list = kmod_list_remove(list)) {
 922                 char buf[PATH_MAX];
 923                 const char *fn = buf;
 924                 struct conf_file *cf = list->data;
 925                 int fd;
 926
 927                 if (cf->is_single) {
 928                         fn = cf->path;
 929                 } else if (snprintf(buf, sizeof(buf), "%s/%s",
 930                                     cf->path, cf->name) >= (int)sizeof(buf)) {
 931                         ERR(ctx, "Error parsing %s/%s: path too long\n",
 932                             cf->path, cf->name);
 933                         free(cf);
 934                         continue;
 935                 }
 936
 937                 fd = open(fn, O_RDONLY|O_CLOEXEC);
 938                 DBG(ctx, "parsing file '%s' fd=%d\n", fn, fd);
 939
 940                 if (fd >= 0)
 941                         kmod_config_parse(config, fd, fn);
 942
 943                 free(cf);
 944         }
 945
 946         kmod_config_parse_kcmdline(config);
 947
 948         return 0;
 949
 950 oom:
 951         for (; list != NULL; list = kmod_list_remove(list))
 952                 free(list->data);
 953
 954         for (; path_list != NULL; path_list = kmod_list_remove(path_list))
 955                 free(path_list->data);
 956
 957         return -ENOMEM;
 958 }
 959
 960 /**********************************************************************
 961  * struct kmod_config_iter functions
 962  **********************************************************************/
 963
 964 enum config_type {
 965         CONFIG_TYPE_BLACKLIST = 0,
 966         CONFIG_TYPE_INSTALL,
 967         CONFIG_TYPE_REMOVE,
 968         CONFIG_TYPE_ALIAS,
 969         CONFIG_TYPE_OPTION,
 970         CONFIG_TYPE_SOFTDEP,
 971 };
 972
 973 struct kmod_config_iter {
 974         enum config_type type;
 975         bool intermediate;
 976         const struct kmod_list *list;
 977         const struct kmod_list *curr;
 978         void *data;
 979         const char *(*get_key)(const struct kmod_list *l);
 980         const char *(*get_value)(const struct kmod_list *l);
 981 };
 982
 983 static const char *softdep_get_plain_softdep(const struct kmod_list *l)
 984 {
 985         char *s = softdep_to_char(l->data);
 986         return s;
 987 }
 988
 989 static struct kmod_config_iter *kmod_config_iter_new(const struct kmod_ctx* ctx,
 990                                                         enum config_type type)
 991 {
 992         struct kmod_config_iter *iter = calloc(1, sizeof(*iter));
 993         const struct kmod_config *config = kmod_get_config(ctx);
 994
 995         if (iter == NULL)
 996                 return NULL;
 997
 998         iter->type = type;
 999
1000         switch (type) {
1001         case CONFIG_TYPE_BLACKLIST:
1002                 iter->list = config->blacklists;
1003                 iter->get_key = kmod_blacklist_get_modname;
1004                 break;
1005         case CONFIG_TYPE_INSTALL:
1006                 iter->list = config->install_commands;
1007                 iter->get_key = kmod_command_get_modname;
1008                 iter->get_value = kmod_command_get_command;
1009                 break;
1010         case CONFIG_TYPE_REMOVE:
1011                 iter->list = config->remove_commands;
1012                 iter->get_key = kmod_command_get_modname;
1013                 iter->get_value = kmod_command_get_command;
1014                 break;
1015         case CONFIG_TYPE_ALIAS:
1016                 iter->list = config->aliases;
1017                 iter->get_key = kmod_alias_get_name;
1018                 iter->get_value = kmod_alias_get_modname;
1019                 break;
1020         case CONFIG_TYPE_OPTION:
1021                 iter->list = config->options;
1022                 iter->get_key = kmod_option_get_modname;
1023                 iter->get_value = kmod_option_get_options;
1024                 break;
1025         case CONFIG_TYPE_SOFTDEP:
1026                 iter->list = config->softdeps;
1027                 iter->get_key = kmod_softdep_get_name;
1028                 iter->get_value = softdep_get_plain_softdep;
1029                 iter->intermediate = true;
1030                 break;
1031         }
1032
1033         return iter;
1034 }
1035
1036 /**
1037  * SECTION:libkmod-config
1038  * @short_description: retrieve current libkmod configuration
1039  */
1040
1041 /**
1042  * kmod_config_get_blacklists:
1043  * @ctx: kmod library context
1044  *
1045  * Retrieve an iterator to deal with the blacklist maintained inside the
1046  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1047  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1048  * be made to initialize the iterator and check if it's valid.
1049  *
1050  * Returns: a new iterator over the blacklists or NULL on failure. Free it
1051  * with kmod_config_iter_free_iter().
1052  */
1053 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_blacklists(const struct kmod_ctx *ctx)
1054 {
1055         if (ctx == NULL)
1056                 return NULL;;
1057
1058         return kmod_config_iter_new(ctx, CONFIG_TYPE_BLACKLIST);
1059 }
1060
1061 /**
1062  * kmod_config_get_install_commands:
1063  * @ctx: kmod library context
1064  *
1065  * Retrieve an iterator to deal with the install commands maintained inside the
1066  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1067  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1068  * be made to initialize the iterator and check if it's valid.
1069  *
1070  * Returns: a new iterator over the install commands or NULL on failure. Free
1071  * it with kmod_config_iter_free_iter().
1072  */
1073 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_install_commands(const struct kmod_ctx *ctx)
1074 {
1075         if (ctx == NULL)
1076                 return NULL;;
1077
1078         return kmod_config_iter_new(ctx, CONFIG_TYPE_INSTALL);
1079 }
1080
1081 /**
1082  * kmod_config_get_remove_commands:
1083  * @ctx: kmod library context
1084  *
1085  * Retrieve an iterator to deal with the remove commands maintained inside the
1086  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1087  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1088  * be made to initialize the iterator and check if it's valid.
1089  *
1090  * Returns: a new iterator over the remove commands or NULL on failure. Free
1091  * it with kmod_config_iter_free_iter().
1092  */
1093 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *ctx)
1094 {
1095         if (ctx == NULL)
1096                 return NULL;;
1097
1098         return kmod_config_iter_new(ctx, CONFIG_TYPE_REMOVE);
1099 }
1100
1101 /**
1102  * kmod_config_get_aliases:
1103  * @ctx: kmod library context
1104  *
1105  * Retrieve an iterator to deal with the aliases maintained inside the
1106  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1107  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1108  * be made to initialize the iterator and check if it's valid.
1109  *
1110  * Returns: a new iterator over the aliases or NULL on failure. Free it with
1111  * kmod_config_iter_free_iter().
1112  */
1113 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx)
1114 {
1115         if (ctx == NULL)
1116                 return NULL;;
1117
1118         return kmod_config_iter_new(ctx, CONFIG_TYPE_ALIAS);
1119 }
1120
1121 /**
1122  * kmod_config_get_options:
1123  * @ctx: kmod library context
1124  *
1125  * Retrieve an iterator to deal with the options maintained inside the
1126  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1127  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1128  * be made to initialize the iterator and check if it's valid.
1129  *
1130  * Returns: a new iterator over the options or NULL on failure. Free it with
1131  * kmod_config_iter_free_iter().
1132  */
1133 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx)
1134 {
1135         if (ctx == NULL)
1136                 return NULL;;
1137
1138         return kmod_config_iter_new(ctx, CONFIG_TYPE_OPTION);
1139 }
1140
1141 /**
1142  * kmod_config_get_softdeps:
1143  * @ctx: kmod library context
1144  *
1145  * Retrieve an iterator to deal with the softdeps maintained inside the
1146  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1147  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1148  * be made to initialize the iterator and check if it's valid.
1149  *
1150  * Returns: a new iterator over the softdeps or NULL on failure. Free it with
1151  * kmod_config_iter_free_iter().
1152  */
1153 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx)
1154 {
1155         if (ctx == NULL)
1156                 return NULL;;
1157
1158         return kmod_config_iter_new(ctx, CONFIG_TYPE_SOFTDEP);
1159 }
1160
1161 /**
1162  * kmod_config_iter_get_key:
1163  * @iter: iterator over a certain configuration
1164  *
1165  * When using a new allocated iterator, user must perform a call to
1166  * kmod_config_iter_next() to initialize iterator's position and check if it's
1167  * valid.
1168  *
1169  * Returns: the key of the current configuration pointed by @iter.
1170  */
1171 KMOD_EXPORT const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter)
1172 {
1173         if (iter == NULL || iter->curr == NULL)
1174                 return NULL;
1175
1176         return iter->get_key(iter->curr);
1177 }
1178
1179 /**
1180  * kmod_config_iter_get_value:
1181  * @iter: iterator over a certain configuration
1182  *
1183  * When using a new allocated iterator, user must perform a call to
1184  * kmod_config_iter_next() to initialize iterator's position and check if it's
1185  * valid.
1186  *
1187  * Returns: the value of the current configuration pointed by @iter.
1188  */
1189 KMOD_EXPORT const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter)
1190 {
1191         const char *s;
1192
1193         if (iter == NULL || iter->curr == NULL)
1194                 return NULL;
1195
1196         if (iter->get_value == NULL)
1197                 return NULL;
1198
1199         if (iter->intermediate) {
1200                 struct kmod_config_iter *i = (struct kmod_config_iter *)iter;
1201
1202                 free(i->data);
1203                 s = i->data = (void *) iter->get_value(iter->curr);
1204         } else
1205                 s = iter->get_value(iter->curr);
1206
1207         return s;
1208 }
1209
1210 /**
1211  * kmod_config_iter_next:
1212  * @iter: iterator over a certain configuration
1213  *
1214  * Make @iter point to the next item of a certain configuration. It's an
1215  * automatically recycling iterator. When it reaches the end, false is
1216  * returned; then if user wants to iterate again, it's sufficient to call this
1217  * function once more.
1218  *
1219  * Returns: true if next position of @iter is valid or false if its end is
1220  * reached.
1221  */
1222 KMOD_EXPORT bool kmod_config_iter_next(struct kmod_config_iter *iter)
1223 {
1224         if (iter == NULL)
1225                 return false;
1226
1227         if (iter->curr == NULL) {
1228                 iter->curr = iter->list;
1229                 return iter->curr != NULL;
1230         }
1231
1232         iter->curr = kmod_list_next(iter->list, iter->curr);
1233
1234         return iter->curr != NULL;
1235 }
1236
1237 /**
1238  * kmod_config_iter_free_iter:
1239  * @iter: iterator over a certain configuration
1240  *
1241  * Free resources used by the iterator.
1242  */
1243 KMOD_EXPORT void kmod_config_iter_free_iter(struct kmod_config_iter *iter)
1244 {
1245         free(iter->data);
1246         free(iter);
1247 }