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, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stddef.h>
  25 #include <stdarg.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28 #include <string.h>
  29 #include <ctype.h>
  30 #include <sys/stat.h>
  31 #include <sys/types.h>
  32 #include <dirent.h>
  33
  34 #include "libkmod.h"
  35 #include "libkmod-internal.h"
  36
  37 struct kmod_alias {
  38         char *name;
  39         char modname[];
  40 };
  41
  42 struct kmod_options {
  43         char *options;
  44         char modname[];
  45 };
  46
  47 struct kmod_command {
  48         char *command;
  49         char modname[];
  50 };
  51
  52 struct kmod_softdep {
  53         char *name;
  54         const char **pre;
  55         const char **post;
  56         unsigned int n_pre;
  57         unsigned int n_post;
  58 };
  59
  60 const char *kmod_blacklist_get_modname(const struct kmod_list *l)
  61 {
  62         return l->data;
  63 }
  64
  65 const char *kmod_alias_get_name(const struct kmod_list *l) {
  66         const struct kmod_alias *alias = l->data;
  67         return alias->name;
  68 }
  69
  70 const char *kmod_alias_get_modname(const struct kmod_list *l) {
  71         const struct kmod_alias *alias = l->data;
  72         return alias->modname;
  73 }
  74
  75 const char *kmod_option_get_options(const struct kmod_list *l) {
  76         const struct kmod_options *alias = l->data;
  77         return alias->options;
  78 }
  79
  80 const char *kmod_option_get_modname(const struct kmod_list *l) {
  81         const struct kmod_options *alias = l->data;
  82         return alias->modname;
  83 }
  84
  85 const char *kmod_command_get_command(const struct kmod_list *l) {
  86         const struct kmod_command *alias = l->data;
  87         return alias->command;
  88 }
  89
  90 const char *kmod_command_get_modname(const struct kmod_list *l) {
  91         const struct kmod_command *alias = l->data;
  92         return alias->modname;
  93 }
  94
  95 const char *kmod_softdep_get_name(const struct kmod_list *l) {
  96         const struct kmod_softdep *dep = l->data;
  97         return dep->name;
  98 }
  99
 100 const char * const *kmod_softdep_get_pre(const struct kmod_list *l, unsigned int *count) {
 101         const struct kmod_softdep *dep = l->data;
 102         *count = dep->n_pre;
 103         return dep->pre;
 104 }
 105
 106 const char * const *kmod_softdep_get_post(const struct kmod_list *l, unsigned int *count) {
 107         const struct kmod_softdep *dep = l->data;
 108         *count = dep->n_post;
 109         return dep->post;
 110 }
 111
 112 /*
 113  * Replace dashes with underscores.
 114  * Dashes inside character range patterns (e.g. [0-9]) are left unchanged.
 115  */
 116 static char *underscores(struct kmod_ctx *ctx, char *s)
 117 {
 118         unsigned int i;
 119
 120         if (!s)
 121                 return NULL;
 122
 123         for (i = 0; s[i]; i++) {
 124                 switch (s[i]) {
 125                 case '-':
 126                         s[i] = '_';
 127                         break;
 128
 129                 case ']':
 130                         INFO(ctx, "Unmatched bracket in %s\n", s);
 131                         break;
 132
 133                 case '[':
 134                         i += strcspn(&s[i], "]");
 135                         if (!s[i])
 136                                 INFO(ctx, "Unmatched bracket in %s\n", s);
 137                         break;
 138                 }
 139         }
 140         return s;
 141 }
 142
 143 static int kmod_config_add_command(struct kmod_config *config,
 144                                                 const char *modname,
 145                                                 const char *command,
 146                                                 const char *command_name,
 147                                                 struct kmod_list **list)
 148 {
 149         _cleanup_free_ struct kmod_command *cmd;
 150         struct kmod_list *l;
 151         size_t modnamelen = strlen(modname) + 1;
 152         size_t commandlen = strlen(command) + 1;
 153
 154         DBG(config->ctx, "modname='%s' cmd='%s %s'\n", modname, command_name,
 155                                                                 command);
 156
 157         cmd = malloc(sizeof(*cmd) + modnamelen + commandlen);
 158         if (!cmd)
 159                 return -ENOMEM;
 160
 161         cmd->command = sizeof(*cmd) + modnamelen + (char *)cmd;
 162         memcpy(cmd->modname, modname, modnamelen);
 163         memcpy(cmd->command, command, commandlen);
 164
 165         l = kmod_list_append(*list, cmd);
 166         if (!l)
 167                 return -ENOMEM;
 168
 169         *list = l;
 170         cmd = NULL;
 171         return 0;
 172 }
 173
 174 static void kmod_config_free_command(struct kmod_config *config,
 175                                         struct kmod_list *l,
 176                                         struct kmod_list **list)
 177 {
 178         struct kmod_command *cmd = l->data;
 179
 180         free(cmd);
 181         *list = kmod_list_remove(l);
 182 }
 183
 184 static int kmod_config_add_options(struct kmod_config *config,
 185                                 const char *modname, const char *options)
 186 {
 187         _cleanup_free_ struct kmod_options *opt;
 188         struct kmod_list *list;
 189         size_t modnamelen = strlen(modname) + 1;
 190         size_t optionslen = strlen(options) + 1;
 191
 192         DBG(config->ctx, "modname='%s' options='%s'\n", modname, options);
 193
 194         opt = malloc(sizeof(*opt) + modnamelen + optionslen);
 195         if (!opt)
 196                 return -ENOMEM;
 197
 198         opt->options = sizeof(*opt) + modnamelen + (char *)opt;
 199
 200         memcpy(opt->modname, modname, modnamelen);
 201         memcpy(opt->options, options, optionslen);
 202         strchr_replace(opt->options, '\t', ' ');
 203
 204         list = kmod_list_append(config->options, opt);
 205         if (!list)
 206                 return -ENOMEM;
 207
 208         opt = NULL;
 209         config->options = list;
 210         return 0;
 211 }
 212
 213 static void kmod_config_free_options(struct kmod_config *config,
 214                                                         struct kmod_list *l)
 215 {
 216         struct kmod_options *opt = l->data;
 217
 218         free(opt);
 219
 220         config->options = kmod_list_remove(l);
 221 }
 222
 223 static int kmod_config_add_alias(struct kmod_config *config,
 224                                         const char *name, const char *modname)
 225 {
 226         _cleanup_free_ struct kmod_alias *alias;
 227         struct kmod_list *list;
 228         size_t namelen = strlen(name) + 1, modnamelen = strlen(modname) + 1;
 229
 230         DBG(config->ctx, "name=%s modname=%s\n", name, modname);
 231
 232         alias = malloc(sizeof(*alias) + namelen + modnamelen);
 233         if (!alias)
 234                 return -ENOMEM;
 235
 236         alias->name = sizeof(*alias) + modnamelen + (char *)alias;
 237
 238         memcpy(alias->modname, modname, modnamelen);
 239         memcpy(alias->name, name, namelen);
 240
 241         list = kmod_list_append(config->aliases, alias);
 242         if (!list)
 243                 return -ENOMEM;
 244
 245         alias = NULL;
 246         config->aliases = list;
 247         return 0;
 248 }
 249
 250 static void kmod_config_free_alias(struct kmod_config *config,
 251                                                         struct kmod_list *l)
 252 {
 253         struct kmod_alias *alias = l->data;
 254
 255         free(alias);
 256
 257         config->aliases = kmod_list_remove(l);
 258 }
 259
 260 static int kmod_config_add_blacklist(struct kmod_config *config,
 261                                                         const char *modname)
 262 {
 263         _cleanup_free_ char *p;
 264         struct kmod_list *list;
 265
 266         DBG(config->ctx, "modname=%s\n", modname);
 267
 268         p = strdup(modname);
 269         if (!p)
 270                 return -ENOMEM;
 271
 272         list = kmod_list_append(config->blacklists, p);
 273         if (!list)
 274                 return -ENOMEM;
 275
 276         p = NULL;
 277         config->blacklists = list;
 278         return 0;
 279 }
 280
 281 static void kmod_config_free_blacklist(struct kmod_config *config,
 282                                                         struct kmod_list *l)
 283 {
 284         free(l->data);
 285         config->blacklists = kmod_list_remove(l);
 286 }
 287
 288 static int kmod_config_add_softdep(struct kmod_config *config,
 289                                                         const char *modname,
 290                                                         const char *line)
 291 {
 292         struct kmod_list *list;
 293         struct kmod_softdep *dep;
 294         const char *s, *p;
 295         char *itr;
 296         unsigned int n_pre = 0, n_post = 0;
 297         size_t modnamelen = strlen(modname) + 1;
 298         size_t buflen = 0;
 299         bool was_space = false;
 300         enum { S_NONE, S_PRE, S_POST } mode = S_NONE;
 301
 302         DBG(config->ctx, "modname=%s\n", modname);
 303
 304         /* analyze and count */
 305         for (p = s = line; ; s++) {
 306                 size_t plen;
 307
 308                 if (*s != '\0') {
 309                         if (!isspace(*s)) {
 310                                 was_space = false;
 311                                 continue;
 312                         }
 313
 314                         if (was_space) {
 315                                 p = s + 1;
 316                                 continue;
 317                         }
 318                         was_space = true;
 319
 320                         if (p >= s)
 321                                 continue;
 322                 }
 323                 plen = s - p;
 324
 325                 if (plen == sizeof("pre:") - 1 &&
 326                                 memcmp(p, "pre:", sizeof("pre:") - 1) == 0)
 327                         mode = S_PRE;
 328                 else if (plen == sizeof("post:") - 1 &&
 329                                 memcmp(p, "post:", sizeof("post:") - 1) == 0)
 330                         mode = S_POST;
 331                 else if (*s != '\0' || (*s == '\0' && !was_space)) {
 332                         if (mode == S_PRE) {
 333                                 buflen += plen + 1;
 334                                 n_pre++;
 335                         } else if (mode == S_POST) {
 336                                 buflen += plen + 1;
 337                                 n_post++;
 338                         }
 339                 }
 340                 p = s + 1;
 341                 if (*s == '\0')
 342                         break;
 343         }
 344
 345         DBG(config->ctx, "%u pre, %u post\n", n_pre, n_post);
 346
 347         dep = malloc(sizeof(struct kmod_softdep) + modnamelen +
 348                      n_pre * sizeof(const char *) +
 349                      n_post * sizeof(const char *) +
 350                      buflen);
 351         if (dep == NULL) {
 352                 ERR(config->ctx, "out-of-memory modname=%s\n", modname);
 353                 return -ENOMEM;
 354         }
 355         dep->n_pre = n_pre;
 356         dep->n_post = n_post;
 357         dep->pre = (const char **)((char *)dep + sizeof(struct kmod_softdep));
 358         dep->post = dep->pre + n_pre;
 359         dep->name = (char *)(dep->post + n_post);
 360
 361         memcpy(dep->name, modname, modnamelen);
 362
 363         /* copy strings */
 364         itr = dep->name + modnamelen;
 365         n_pre = 0;
 366         n_post = 0;
 367         mode = S_NONE;
 368         for (p = s = line; ; s++) {
 369                 size_t plen;
 370
 371                 if (*s != '\0') {
 372                         if (!isspace(*s)) {
 373                                 was_space = false;
 374                                 continue;
 375                         }
 376
 377                         if (was_space) {
 378                                 p = s + 1;
 379                                 continue;
 380                         }
 381                         was_space = true;
 382
 383                         if (p >= s)
 384                                 continue;
 385                 }
 386                 plen = s - p;
 387
 388                 if (plen == sizeof("pre:") - 1 &&
 389                                 memcmp(p, "pre:", sizeof("pre:") - 1) == 0)
 390                         mode = S_PRE;
 391                 else if (plen == sizeof("post:") - 1 &&
 392                                 memcmp(p, "post:", sizeof("post:") - 1) == 0)
 393                         mode = S_POST;
 394                 else if (*s != '\0' || (*s == '\0' && !was_space)) {
 395                         if (mode == S_PRE) {
 396                                 dep->pre[n_pre] = itr;
 397                                 memcpy(itr, p, plen);
 398                                 itr[plen] = '\0';
 399                                 itr += plen + 1;
 400                                 n_pre++;
 401                         } else if (mode == S_POST) {
 402                                 dep->post[n_post] = itr;
 403                                 memcpy(itr, p, plen);
 404                                 itr[plen] = '\0';
 405                                 itr += plen + 1;
 406                                 n_post++;
 407                         }
 408                 }
 409                 p = s + 1;
 410                 if (*s == '\0')
 411                         break;
 412         }
 413
 414         list = kmod_list_append(config->softdeps, dep);
 415         if (list == NULL) {
 416                 free(dep);
 417                 return -ENOMEM;
 418         }
 419         config->softdeps = list;
 420
 421         return 0;
 422 }
 423
 424 static char *softdep_to_char(struct kmod_softdep *dep) {
 425         const size_t sz_preprefix = sizeof("pre: ") - 1;
 426         const size_t sz_postprefix = sizeof("post: ") - 1;
 427         size_t sz = 1; /* at least '\0' */
 428         size_t sz_pre, sz_post;
 429         const char *start, *end;
 430         char *s, *itr;
 431
 432         /*
 433          * Rely on the fact that dep->pre[] and dep->post[] are strv's that
 434          * point to a contiguous buffer
 435          */
 436         if (dep->n_pre > 0) {
 437                 start = dep->pre[0];
 438                 end = dep->pre[dep->n_pre - 1]
 439                                         + strlen(dep->pre[dep->n_pre - 1]);
 440                 sz_pre = end - start;
 441                 sz += sz_pre + sz_preprefix;
 442         } else
 443                 sz_pre = 0;
 444
 445         if (dep->n_post > 0) {
 446                 start = dep->post[0];
 447                 end = dep->post[dep->n_post - 1]
 448                                         + strlen(dep->post[dep->n_post - 1]);
 449                 sz_post = end - start;
 450                 sz += sz_post + sz_postprefix;
 451         } else
 452                 sz_post = 0;
 453
 454         itr = s = malloc(sz);
 455         if (s == NULL)
 456                 return NULL;
 457
 458         if (sz_pre) {
 459                 char *p;
 460
 461                 memcpy(itr, "pre: ", sz_preprefix);
 462                 itr += sz_preprefix;
 463
 464                 /* include last '\0' */
 465                 memcpy(itr, dep->pre[0], sz_pre + 1);
 466                 for (p = itr; p < itr + sz_pre; p++) {
 467                         if (*p == '\0')
 468                                 *p = ' ';
 469                 }
 470                 itr = p;
 471         }
 472
 473         if (sz_post) {
 474                 char *p;
 475
 476                 memcpy(itr, "post: ", sz_postprefix);
 477                 itr += sz_postprefix;
 478
 479                 /* include last '\0' */
 480                 memcpy(itr, dep->post[0], sz_post + 1);
 481                 for (p = itr; p < itr + sz_post; p++) {
 482                         if (*p == '\0')
 483                                 *p = ' ';
 484                 }
 485                 itr = p;
 486         }
 487
 488         *itr = '\0';
 489
 490         return s;
 491 }
 492
 493 static void kmod_config_free_softdep(struct kmod_config *config,
 494                                                         struct kmod_list *l)
 495 {
 496         free(l->data);
 497         config->softdeps = kmod_list_remove(l);
 498 }
 499
 500 static void kcmdline_parse_result(struct kmod_config *config, char *modname,
 501                                                 char *param, char *value)
 502 {
 503         if (modname == NULL || param == NULL)
 504                 return;
 505
 506         DBG(config->ctx, "%s %s\n", modname, param);
 507
 508         if (streq(modname, "modprobe") && !strncmp(param, "blacklist=", 10)) {
 509                 for (;;) {
 510                         char *t = strsep(&value, ",");
 511                         if (t == NULL)
 512                                 break;
 513
 514                         kmod_config_add_blacklist(config, t);
 515                 }
 516         } else {
 517                 kmod_config_add_options(config,
 518                                 underscores(config->ctx, modname), param);
 519         }
 520 }
 521
 522 static int kmod_config_parse_kcmdline(struct kmod_config *config)
 523 {
 524         char buf[KCMD_LINE_SIZE];
 525         int fd, err;
 526         char *p, *modname,  *param = NULL, *value = NULL, is_module = 1;
 527
 528         fd = open("/proc/cmdline", O_RDONLY|O_CLOEXEC);
 529         if (fd < 0) {
 530                 err = -errno;
 531                 DBG(config->ctx, "could not open '/proc/cmdline' for reading: %m\n");
 532                 return err;
 533         }
 534
 535         err = read_str_safe(fd, buf, sizeof(buf));
 536         close(fd);
 537         if (err < 0) {
 538                 ERR(config->ctx, "could not read from '/proc/cmdline': %s\n",
 539                                                         strerror(-err));
 540                 return err;
 541         }
 542
 543         for (p = buf, modname = buf; *p != '\0' && *p != '\n'; p++) {
 544                 switch (*p) {
 545                 case ' ':
 546                         *p = '\0';
 547                         if (is_module)
 548                                 kcmdline_parse_result(config, modname, param, value);
 549                         param = value = NULL;
 550                         modname = p + 1;
 551                         is_module = 1;
 552                         break;
 553                 case '.':
 554                         if (param == NULL) {
 555                                 *p = '\0';
 556                                 param = p + 1;
 557                         }
 558                         break;
 559                 case '=':
 560                         if (param != NULL)
 561                                 value = p + 1;
 562                         else
 563                                 is_module = 0;
 564                         break;
 565                 }
 566         }
 567
 568         *p = '\0';
 569         if (is_module)
 570                 kcmdline_parse_result(config, modname, param, value);
 571
 572         return 0;
 573 }
 574
 575 /*
 576  * Take an fd and own it. It will be closed on return. filename is used only
 577  * for debug messages
 578  */
 579 static int kmod_config_parse(struct kmod_config *config, int fd,
 580                                                         const char *filename)
 581 {
 582         struct kmod_ctx *ctx = config->ctx;
 583         char *line;
 584         FILE *fp;
 585         unsigned int linenum = 0;
 586         int err;
 587
 588         fp = fdopen(fd, "r");
 589         if (fp == NULL) {
 590                 err = -errno;
 591                 ERR(config->ctx, "fd %d: %m\n", fd);
 592                 close(fd);
 593                 return err;
 594         }
 595
 596         while ((line = getline_wrapped(fp, &linenum)) != NULL) {
 597                 char *cmd, *saveptr;
 598
 599                 if (line[0] == '\0' || line[0] == '#')
 600                         goto done_next;
 601
 602                 cmd = strtok_r(line, "\t ", &saveptr);
 603                 if (cmd == NULL)
 604                         goto done_next;
 605
 606                 if (streq(cmd, "alias")) {
 607                         char *alias = strtok_r(NULL, "\t ", &saveptr);
 608                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 609
 610                         if (alias == NULL || modname == NULL)
 611                                 goto syntax_error;
 612
 613                         kmod_config_add_alias(config,
 614                                                 underscores(ctx, alias),
 615                                                 underscores(ctx, modname));
 616                 } else if (streq(cmd, "blacklist")) {
 617                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 618
 619                         if (modname == NULL)
 620                                 goto syntax_error;
 621
 622                         kmod_config_add_blacklist(config,
 623                                                 underscores(ctx, modname));
 624                 } else if (streq(cmd, "options")) {
 625                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 626                         char *options = strtok_r(NULL, "\0", &saveptr);
 627
 628                         if (modname == NULL || options == NULL)
 629                                 goto syntax_error;
 630
 631                         kmod_config_add_options(config,
 632                                                 underscores(ctx, modname),
 633                                                 options);
 634                 } else if (streq(cmd, "install")) {
 635                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 636                         char *installcmd = strtok_r(NULL, "\0", &saveptr);
 637
 638                         if (modname == NULL || installcmd == NULL)
 639                                 goto syntax_error;
 640
 641                         kmod_config_add_command(config,
 642                                         underscores(ctx, modname),
 643                                         installcmd,
 644                                         cmd, &config->install_commands);
 645                 } else if (streq(cmd, "remove")) {
 646                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 647                         char *removecmd = strtok_r(NULL, "\0", &saveptr);
 648
 649                         if (modname == NULL || removecmd == NULL)
 650                                 goto syntax_error;
 651
 652                         kmod_config_add_command(config,
 653                                         underscores(ctx, modname),
 654                                         removecmd,
 655                                         cmd, &config->remove_commands);
 656                 } else if (streq(cmd, "softdep")) {
 657                         char *modname = strtok_r(NULL, "\t ", &saveptr);
 658                         char *softdeps = strtok_r(NULL, "\0", &saveptr);
 659
 660                         if (modname == NULL || softdeps == NULL)
 661                                 goto syntax_error;
 662
 663                         kmod_config_add_softdep(config,
 664                                         underscores(ctx, modname),
 665                                         softdeps);
 666                 } else if (streq(cmd, "include")
 667                                 || streq(cmd, "config")) {
 668                         ERR(ctx, "%s: command %s is deprecated and not parsed anymore\n",
 669                                                                 filename, cmd);
 670                 } else {
 671 syntax_error:
 672                         ERR(ctx, "%s line %u: ignoring bad line starting with '%s'\n",
 673                                                 filename, linenum, cmd);
 674                 }
 675
 676 done_next:
 677                 free(line);
 678         }
 679
 680         fclose(fp);
 681
 682         return 0;
 683 }
 684
 685 void kmod_config_free(struct kmod_config *config)
 686 {
 687         while (config->aliases)
 688                 kmod_config_free_alias(config, config->aliases);
 689
 690         while (config->blacklists)
 691                 kmod_config_free_blacklist(config, config->blacklists);
 692
 693         while (config->options)
 694                 kmod_config_free_options(config, config->options);
 695
 696         while (config->install_commands) {
 697                 kmod_config_free_command(config, config->install_commands,
 698                                                 &config->install_commands);
 699         }
 700
 701         while (config->remove_commands) {
 702                 kmod_config_free_command(config, config->remove_commands,
 703                                                 &config->remove_commands);
 704         }
 705
 706         while (config->softdeps)
 707                 kmod_config_free_softdep(config, config->softdeps);
 708
 709         for (; config->paths != NULL;
 710                                 config->paths = kmod_list_remove(config->paths))
 711                 free(config->paths->data);
 712
 713         free(config);
 714 }
 715
 716 static bool conf_files_filter_out(struct kmod_ctx *ctx, DIR *d,
 717                                         const char *path, const char *fn)
 718 {
 719         size_t len = strlen(fn);
 720         struct stat st;
 721
 722         if (fn[0] == '.')
 723                 return true;
 724
 725         if (len < 6 || (!streq(&fn[len - 5], ".conf")
 726                                 && !streq(&fn[len - 6], ".alias")))
 727                 return true;
 728
 729         fstatat(dirfd(d), fn, &st, 0);
 730
 731         if (S_ISDIR(st.st_mode)) {
 732                 ERR(ctx, "Directories inside directories are not supported: "
 733                                                         "%s/%s\n", path, fn);
 734                 return true;
 735         }
 736
 737         return false;
 738 }
 739
 740 struct conf_file {
 741         const char *path;
 742         bool is_single;
 743         char name[];
 744 };
 745
 746 static int conf_files_insert_sorted(struct kmod_ctx *ctx,
 747                                         struct kmod_list **list,
 748                                         const char *path, const char *name)
 749 {
 750         struct kmod_list *lpos, *tmp;
 751         struct conf_file *cf;
 752         size_t namelen;
 753         int cmp = -1;
 754         bool is_single = false;
 755
 756         if (name == NULL) {
 757                 name = basename(path);
 758                 is_single = true;
 759         }
 760
 761         kmod_list_foreach(lpos, *list) {
 762                 cf = lpos->data;
 763
 764                 if ((cmp = strcmp(name, cf->name)) <= 0)
 765                         break;
 766         }
 767
 768         if (cmp == 0) {
 769                 DBG(ctx, "Ignoring duplicate config file: %s/%s\n", path,
 770                                                                         name);
 771                 return -EEXIST;
 772         }
 773
 774         namelen = strlen(name);
 775         cf = malloc(sizeof(*cf) + namelen + 1);
 776         if (cf == NULL)
 777                 return -ENOMEM;
 778
 779         memcpy(cf->name, name, namelen + 1);
 780         cf->path = path;
 781         cf->is_single = is_single;
 782
 783         if (lpos == NULL)
 784                 tmp = kmod_list_append(*list, cf);
 785         else if (lpos == *list)
 786                 tmp = kmod_list_prepend(*list, cf);
 787         else
 788                 tmp = kmod_list_insert_before(lpos, cf);
 789
 790         if (tmp == NULL) {
 791                 free(cf);
 792                 return -ENOMEM;
 793         }
 794
 795         if (lpos == NULL || lpos == *list)
 796                 *list = tmp;
 797
 798         return 0;
 799 }
 800
 801 /*
 802  * Insert configuration files in @list, ignoring duplicates
 803  */
 804 static int conf_files_list(struct kmod_ctx *ctx, struct kmod_list **list,
 805                                                 const char *path,
 806                                                 unsigned long long *path_stamp)
 807 {
 808         DIR *d;
 809         int err;
 810         struct stat st;
 811         struct dirent *dent;
 812
 813         if (stat(path, &st) != 0) {
 814                 err = -errno;
 815                 DBG(ctx, "could not stat '%s': %m\n", path);
 816                 return err;
 817         }
 818
 819         *path_stamp = stat_mstamp(&st);
 820
 821         if (!S_ISDIR(st.st_mode)) {
 822                 conf_files_insert_sorted(ctx, list, path, NULL);
 823                 return 0;
 824         }
 825
 826         d = opendir(path);
 827         if (d == NULL) {
 828                 ERR(ctx, "opendir(%s): %m\n", path);
 829                 return -EINVAL;
 830         }
 831
 832         for (dent = readdir(d); dent != NULL; dent = readdir(d)) {
 833                 if (conf_files_filter_out(ctx, d, path, dent->d_name))
 834                         continue;
 835
 836                 conf_files_insert_sorted(ctx, list, path, dent->d_name);
 837         }
 838
 839         closedir(d);
 840         return 0;
 841 }
 842
 843 int kmod_config_new(struct kmod_ctx *ctx, struct kmod_config **p_config,
 844                                         const char * const *config_paths)
 845 {
 846         struct kmod_config *config;
 847         struct kmod_list *list = NULL;
 848         struct kmod_list *path_list = NULL;
 849         size_t i;
 850
 851         conf_files_insert_sorted(ctx, &list, kmod_get_dirname(ctx), "modules.softdep");
 852
 853         for (i = 0; config_paths[i] != NULL; i++) {
 854                 const char *path = config_paths[i];
 855                 unsigned long long path_stamp = 0;
 856                 size_t pathlen;
 857                 struct kmod_list *tmp;
 858                 struct kmod_config_path *cf;
 859
 860                 if (conf_files_list(ctx, &list, path, &path_stamp) < 0)
 861                         continue;
 862
 863                 pathlen = strlen(path) + 1;
 864                 cf = malloc(sizeof(*cf) + pathlen);
 865                 if (cf == NULL)
 866                         goto oom;
 867
 868                 cf->stamp = path_stamp;
 869                 memcpy(cf->path, path, pathlen);
 870
 871                 tmp = kmod_list_append(path_list, cf);
 872                 if (tmp == NULL)
 873                         goto oom;
 874                 path_list = tmp;
 875         }
 876
 877         *p_config = config = calloc(1, sizeof(struct kmod_config));
 878         if (config == NULL)
 879                 goto oom;
 880
 881         config->paths = path_list;
 882         config->ctx = ctx;
 883
 884         for (; list != NULL; list = kmod_list_remove(list)) {
 885                 char fn[PATH_MAX];
 886                 struct conf_file *cf = list->data;
 887                 int fd;
 888
 889                 if (cf->is_single)
 890                         strcpy(fn, cf->path);
 891                 else
 892                         snprintf(fn, sizeof(fn),"%s/%s", cf->path,
 893                                         cf->name);
 894
 895                 fd = open(fn, O_RDONLY|O_CLOEXEC);
 896                 DBG(ctx, "parsing file '%s' fd=%d\n", fn, fd);
 897
 898                 if (fd >= 0)
 899                         kmod_config_parse(config, fd, fn);
 900
 901                 free(cf);
 902         }
 903
 904         kmod_config_parse_kcmdline(config);
 905
 906         return 0;
 907
 908 oom:
 909         for (; list != NULL; list = kmod_list_remove(list))
 910                 free(list->data);
 911
 912         for (; path_list != NULL; path_list = kmod_list_remove(path_list))
 913                 free(path_list->data);
 914
 915         return -ENOMEM;
 916 }
 917
 918 /**********************************************************************
 919  * struct kmod_config_iter functions
 920  **********************************************************************/
 921
 922 enum config_type {
 923         CONFIG_TYPE_BLACKLIST = 0,
 924         CONFIG_TYPE_INSTALL,
 925         CONFIG_TYPE_REMOVE,
 926         CONFIG_TYPE_ALIAS,
 927         CONFIG_TYPE_OPTION,
 928         CONFIG_TYPE_SOFTDEP,
 929 };
 930
 931 struct kmod_config_iter {
 932         enum config_type type;
 933         bool intermediate;
 934         const struct kmod_list *list;
 935         const struct kmod_list *curr;
 936         void *data;
 937         const char *(*get_key)(const struct kmod_list *l);
 938         const char *(*get_value)(const struct kmod_list *l);
 939 };
 940
 941 static const char *softdep_get_plain_softdep(const struct kmod_list *l)
 942 {
 943         char *s = softdep_to_char(l->data);
 944         return s;
 945 }
 946
 947 static struct kmod_config_iter *kmod_config_iter_new(const struct kmod_ctx* ctx,
 948                                                         enum config_type type)
 949 {
 950         struct kmod_config_iter *iter = calloc(1, sizeof(*iter));
 951         const struct kmod_config *config = kmod_get_config(ctx);
 952
 953         if (iter == NULL)
 954                 return NULL;
 955
 956         iter->type = type;
 957
 958         switch (type) {
 959         case CONFIG_TYPE_BLACKLIST:
 960                 iter->list = config->blacklists;
 961                 iter->get_key = kmod_blacklist_get_modname;
 962                 break;
 963         case CONFIG_TYPE_INSTALL:
 964                 iter->list = config->install_commands;
 965                 iter->get_key = kmod_command_get_modname;
 966                 iter->get_value = kmod_command_get_command;
 967                 break;
 968         case CONFIG_TYPE_REMOVE:
 969                 iter->list = config->remove_commands;
 970                 iter->get_key = kmod_command_get_modname;
 971                 iter->get_value = kmod_command_get_command;
 972                 break;
 973         case CONFIG_TYPE_ALIAS:
 974                 iter->list = config->aliases;
 975                 iter->get_key = kmod_alias_get_name;
 976                 iter->get_value = kmod_alias_get_modname;
 977                 break;
 978         case CONFIG_TYPE_OPTION:
 979                 iter->list = config->options;
 980                 iter->get_key = kmod_option_get_modname;
 981                 iter->get_value = kmod_option_get_options;
 982                 break;
 983         case CONFIG_TYPE_SOFTDEP:
 984                 iter->list = config->softdeps;
 985                 iter->get_key = kmod_softdep_get_name;
 986                 iter->get_value = softdep_get_plain_softdep;
 987                 iter->intermediate = true;
 988                 break;
 989         }
 990
 991         return iter;
 992 }
 993
 994 /**
 995  * SECTION:libkmod-config
 996  * @short_description: retrieve current libkmod configuration
 997  */
 998
 999 /**
1000  * kmod_config_get_blacklists:
1001  * @ctx: kmod library context
1002  *
1003  * Retrieve an iterator to deal with the blacklist maintained inside the
1004  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1005  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1006  * be made to initialize the iterator and check if it's valid.
1007  *
1008  * Returns: a new iterator over the blacklists or NULL on failure. Free it
1009  * with kmod_config_iter_free_iter().
1010  */
1011 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_blacklists(const struct kmod_ctx *ctx)
1012 {
1013         if (ctx == NULL)
1014                 return NULL;;
1015
1016         return kmod_config_iter_new(ctx, CONFIG_TYPE_BLACKLIST);
1017 }
1018
1019 /**
1020  * kmod_config_get_install_commands:
1021  * @ctx: kmod library context
1022  *
1023  * Retrieve an iterator to deal with the install commands maintained inside the
1024  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1025  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1026  * be made to initialize the iterator and check if it's valid.
1027  *
1028  * Returns: a new iterator over the install commands or NULL on failure. Free
1029  * it with kmod_config_iter_free_iter().
1030  */
1031 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_install_commands(const struct kmod_ctx *ctx)
1032 {
1033         if (ctx == NULL)
1034                 return NULL;;
1035
1036         return kmod_config_iter_new(ctx, CONFIG_TYPE_INSTALL);
1037 }
1038
1039 /**
1040  * kmod_config_get_remove_commands:
1041  * @ctx: kmod library context
1042  *
1043  * Retrieve an iterator to deal with the remove commands maintained inside the
1044  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1045  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1046  * be made to initialize the iterator and check if it's valid.
1047  *
1048  * Returns: a new iterator over the remove commands or NULL on failure. Free
1049  * it with kmod_config_iter_free_iter().
1050  */
1051 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_remove_commands(const struct kmod_ctx *ctx)
1052 {
1053         if (ctx == NULL)
1054                 return NULL;;
1055
1056         return kmod_config_iter_new(ctx, CONFIG_TYPE_REMOVE);
1057 }
1058
1059 /**
1060  * kmod_config_get_aliases:
1061  * @ctx: kmod library context
1062  *
1063  * Retrieve an iterator to deal with the aliases maintained inside the
1064  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1065  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1066  * be made to initialize the iterator and check if it's valid.
1067  *
1068  * Returns: a new iterator over the aliases or NULL on failure. Free it with
1069  * kmod_config_iter_free_iter().
1070  */
1071 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_aliases(const struct kmod_ctx *ctx)
1072 {
1073         if (ctx == NULL)
1074                 return NULL;;
1075
1076         return kmod_config_iter_new(ctx, CONFIG_TYPE_ALIAS);
1077 }
1078
1079 /**
1080  * kmod_config_get_options:
1081  * @ctx: kmod library context
1082  *
1083  * Retrieve an iterator to deal with the options maintained inside the
1084  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1085  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1086  * be made to initialize the iterator and check if it's valid.
1087  *
1088  * Returns: a new iterator over the options or NULL on failure. Free it with
1089  * kmod_config_iter_free_iter().
1090  */
1091 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_options(const struct kmod_ctx *ctx)
1092 {
1093         if (ctx == NULL)
1094                 return NULL;;
1095
1096         return kmod_config_iter_new(ctx, CONFIG_TYPE_OPTION);
1097 }
1098
1099 /**
1100  * kmod_config_get_softdeps:
1101  * @ctx: kmod library context
1102  *
1103  * Retrieve an iterator to deal with the softdeps maintained inside the
1104  * library. See kmod_config_iter_get_key(), kmod_config_iter_get_value() and
1105  * kmod_config_iter_next(). At least one call to kmod_config_iter_next() must
1106  * be made to initialize the iterator and check if it's valid.
1107  *
1108  * Returns: a new iterator over the softdeps or NULL on failure. Free it with
1109  * kmod_config_iter_free_iter().
1110  */
1111 KMOD_EXPORT struct kmod_config_iter *kmod_config_get_softdeps(const struct kmod_ctx *ctx)
1112 {
1113         if (ctx == NULL)
1114                 return NULL;;
1115
1116         return kmod_config_iter_new(ctx, CONFIG_TYPE_SOFTDEP);
1117 }
1118
1119 /**
1120  * kmod_config_iter_get_key:
1121  * @iter: iterator over a certain configuration
1122  *
1123  * When using a new allocated iterator, user must perform a call to
1124  * kmod_config_iter_next() to initialize iterator's position and check if it's
1125  * valid.
1126  *
1127  * Returns: the key of the current configuration pointed by @iter.
1128  */
1129 KMOD_EXPORT const char *kmod_config_iter_get_key(const struct kmod_config_iter *iter)
1130 {
1131         if (iter == NULL || iter->curr == NULL)
1132                 return NULL;
1133
1134         return iter->get_key(iter->curr);
1135 }
1136
1137 /**
1138  * kmod_config_iter_get_value:
1139  * @iter: iterator over a certain configuration
1140  *
1141  * When using a new allocated iterator, user must perform a call to
1142  * kmod_config_iter_next() to initialize iterator's position and check if it's
1143  * valid.
1144  *
1145  * Returns: the value of the current configuration pointed by @iter.
1146  */
1147 KMOD_EXPORT const char *kmod_config_iter_get_value(const struct kmod_config_iter *iter)
1148 {
1149         const char *s;
1150
1151         if (iter == NULL || iter->curr == NULL)
1152                 return NULL;
1153
1154         if (iter->get_value == NULL)
1155                 return NULL;
1156
1157         if (iter->intermediate) {
1158                 struct kmod_config_iter *i = (struct kmod_config_iter *)iter;
1159
1160                 free(i->data);
1161                 s = i->data = (void *) iter->get_value(iter->curr);
1162         } else
1163                 s = iter->get_value(iter->curr);
1164
1165         return s;
1166 }
1167
1168 /**
1169  * kmod_config_iter_next:
1170  * @iter: iterator over a certain configuration
1171  *
1172  * Make @iter point to the next item of a certain configuration. It's an
1173  * automatically recycling iterator. When it reaches the end, false is
1174  * returned; then if user wants to iterate again, it's sufficient to call this
1175  * function once more.
1176  *
1177  * Returns: true if next position of @iter is valid or false if its end is
1178  * reached.
1179  */
1180 KMOD_EXPORT bool kmod_config_iter_next(struct kmod_config_iter *iter)
1181 {
1182         if (iter == NULL)
1183                 return false;
1184
1185         if (iter->curr == NULL) {
1186                 iter->curr = iter->list;
1187                 return iter->curr != NULL;
1188         }
1189
1190         iter->curr = kmod_list_next(iter->list, iter->curr);
1191
1192         return iter->curr != NULL;
1193 }
1194
1195 /**
1196  * kmod_config_iter_free_iter:
1197  * @iter: iterator over a certain configuration
1198  *
1199  * Free resources used by the iterator.
1200  */
1201 KMOD_EXPORT void kmod_config_iter_free_iter(struct kmod_config_iter *iter)
1202 {
1203         free(iter->data);
1204         free(iter);
1205 }