file.c

   1 /*
   2  * libuci - Library for the Unified Configuration Interface
   3  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU Lesser General Public License for more details.
  13  */
  14
  15 /*
  16  * This file contains the code for parsing uci config files
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <sys/types.h>
  21 #include <sys/file.h>
  22 #include <stdbool.h>
  23 #include <unistd.h>
  24 #include <fcntl.h>
  25 #include <stdio.h>
  26 #include <ctype.h>
  27 #include <glob.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30
  31 #include "uci.h"
  32 #include "uci_internal.h"
  33
  34 #define LINEBUF 32
  35 #define LINEBUF_MAX     4096
  36
  37 /*
  38  * Fetch a new line from the input stream and resize buffer if necessary
  39  */
  40 __private void uci_getln(struct uci_context *ctx, int offset)
  41 {
  42         struct uci_parse_context *pctx = ctx->pctx;
  43         char *p;
  44         int ofs;
  45
  46         if (pctx->buf == NULL) {
  47                 pctx->buf = uci_malloc(ctx, LINEBUF);
  48                 pctx->bufsz = LINEBUF;
  49         }
  50
  51         ofs = offset;
  52         do {
  53                 p = &pctx->buf[ofs];
  54                 p[ofs] = 0;
  55
  56                 p = fgets(p, pctx->bufsz - ofs, pctx->file);
  57                 if (!p || !*p)
  58                         return;
  59
  60                 ofs += strlen(p);
  61                 if (pctx->buf[ofs - 1] == '\n') {
  62                         pctx->line++;
  63                         pctx->buf[ofs - 1] = 0;
  64                         return;
  65                 }
  66
  67                 if (pctx->bufsz > LINEBUF_MAX/2)
  68                         uci_parse_error(ctx, p, "line too long");
  69
  70                 pctx->bufsz *= 2;
  71                 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
  72         } while (1);
  73 }
  74
  75
  76 /*
  77  * parse a character escaped by '\'
  78  * returns true if the escaped character is to be parsed
  79  * returns false if the escaped character is to be ignored
  80  */
  81 static inline bool parse_backslash(struct uci_context *ctx, char **str)
  82 {
  83         /* skip backslash */
  84         *str += 1;
  85
  86         /* undecoded backslash at the end of line, fetch the next line */
  87         if (!**str) {
  88                 *str += 1;
  89                 uci_getln(ctx, *str - ctx->pctx->buf);
  90                 return false;
  91         }
  92
  93         /* FIXME: decode escaped char, necessary? */
  94         return true;
  95 }
  96
  97 /*
  98  * move the string pointer forward until a non-whitespace character or
  99  * EOL is reached
 100  */
 101 static void skip_whitespace(struct uci_context *ctx, char **str)
 102 {
 103 restart:
 104         while (**str && isspace(**str))
 105                 *str += 1;
 106
 107         if (**str == '\\') {
 108                 if (!parse_backslash(ctx, str))
 109                         goto restart;
 110         }
 111 }
 112
 113 static inline void addc(char **dest, char **src)
 114 {
 115         **dest = **src;
 116         *dest += 1;
 117         *src += 1;
 118 }
 119
 120 /*
 121  * parse a double quoted string argument from the command line
 122  */
 123 static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
 124 {
 125         char c;
 126
 127         /* skip quote character */
 128         *str += 1;
 129
 130         while ((c = **str)) {
 131                 switch(c) {
 132                 case '"':
 133                         **target = 0;
 134                         *str += 1;
 135                         return;
 136                 case '\\':
 137                         if (!parse_backslash(ctx, str))
 138                                 continue;
 139                         /* fall through */
 140                 default:
 141                         addc(target, str);
 142                         break;
 143                 }
 144         }
 145         uci_parse_error(ctx, *str, "unterminated \"");
 146 }
 147
 148 /*
 149  * parse a single quoted string argument from the command line
 150  */
 151 static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
 152 {
 153         char c;
 154         /* skip quote character */
 155         *str += 1;
 156
 157         while ((c = **str)) {
 158                 switch(c) {
 159                 case '\'':
 160                         **target = 0;
 161                         *str += 1;
 162                         return;
 163                 default:
 164                         addc(target, str);
 165                 }
 166         }
 167         uci_parse_error(ctx, *str, "unterminated '");
 168 }
 169
 170 /*
 171  * parse a string from the command line and detect the quoting style
 172  */
 173 static void parse_str(struct uci_context *ctx, char **str, char **target)
 174 {
 175         bool next = true;
 176         do {
 177                 switch(**str) {
 178                 case '\'':
 179                         parse_single_quote(ctx, str, target);
 180                         break;
 181                 case '"':
 182                         parse_double_quote(ctx, str, target);
 183                         break;
 184                 case '#':
 185                         **str = 0;
 186                         /* fall through */
 187                 case 0:
 188                         goto done;
 189                 case ';':
 190                         next = false;
 191                         goto done;
 192                 case '\\':
 193                         if (!parse_backslash(ctx, str))
 194                                 continue;
 195                         /* fall through */
 196                 default:
 197                         addc(target, str);
 198                         break;
 199                 }
 200         } while (**str && !isspace(**str));
 201 done:
 202
 203         /*
 204          * if the string was unquoted and we've stopped at a whitespace
 205          * character, skip to the next one, because the whitespace will
 206          * be overwritten by a null byte here
 207          */
 208         if (**str && next)
 209                 *str += 1;
 210
 211         /* terminate the parsed string */
 212         **target = 0;
 213 }
 214
 215 /*
 216  * extract the next argument from the command line
 217  */
 218 static char *next_arg(struct uci_context *ctx, char **str, bool required, bool name)
 219 {
 220         char *val;
 221         char *ptr;
 222
 223         val = ptr = *str;
 224         skip_whitespace(ctx, str);
 225         if(*str[0] == ';') {
 226                 *str[0] = 0;
 227                 *str += 1;
 228         } else {
 229                 parse_str(ctx, str, &ptr);
 230         }
 231         if (!*val) {
 232                 if (required)
 233                         uci_parse_error(ctx, *str, "insufficient arguments");
 234                 goto done;
 235         }
 236
 237         if (name && !uci_validate_name(val))
 238                 uci_parse_error(ctx, val, "invalid character in field");
 239
 240 done:
 241         return val;
 242 }
 243
 244 int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result)
 245 {
 246         UCI_HANDLE_ERR(ctx);
 247         UCI_ASSERT(ctx, str != NULL);
 248         UCI_ASSERT(ctx, result != NULL);
 249
 250         if (ctx->pctx && (ctx->pctx->file != stream))
 251                 uci_cleanup(ctx);
 252
 253         if (!ctx->pctx)
 254                 uci_alloc_parse_context(ctx);
 255
 256         ctx->pctx->file = stream;
 257
 258         if (!*str) {
 259                 uci_getln(ctx, 0);
 260                 *str = ctx->pctx->buf;
 261         }
 262
 263         *result = next_arg(ctx, str, false, false);
 264
 265         return 0;
 266 }
 267
 268 static int
 269 uci_fill_ptr(struct uci_context *ctx, struct uci_ptr *ptr, struct uci_element *e)
 270 {
 271         UCI_ASSERT(ctx, ptr != NULL);
 272         UCI_ASSERT(ctx, e != NULL);
 273
 274         memset(ptr, 0, sizeof(struct uci_ptr));
 275         switch(e->type) {
 276         case UCI_TYPE_OPTION:
 277                 ptr->o = uci_to_option(e);
 278                 goto fill_option;
 279         case UCI_TYPE_SECTION:
 280                 ptr->s = uci_to_section(e);
 281                 goto fill_section;
 282         case UCI_TYPE_PACKAGE:
 283                 ptr->p = uci_to_package(e);
 284                 goto fill_package;
 285         default:
 286                 UCI_THROW(ctx, UCI_ERR_INVAL);
 287         }
 288
 289 fill_option:
 290         ptr->option = ptr->o->e.name;
 291         ptr->s = ptr->o->section;
 292 fill_section:
 293         ptr->section = ptr->s->e.name;
 294         ptr->p = ptr->s->package;
 295 fill_package:
 296         ptr->package = ptr->p->e.name;
 297
 298         ptr->flags |= UCI_LOOKUP_DONE;
 299
 300         return 0;
 301 }
 302
 303
 304
 305 /*
 306  * verify that the end of the line or command is reached.
 307  * throw an error if extra arguments are given on the command line
 308  */
 309 static void assert_eol(struct uci_context *ctx, char **str)
 310 {
 311         char *tmp;
 312
 313         skip_whitespace(ctx, str);
 314         tmp = next_arg(ctx, str, false, false);
 315         if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
 316                 uci_parse_error(ctx, *str, "too many arguments");
 317 }
 318
 319 /*
 320  * switch to a different config, either triggered by uci_load, or by a
 321  * 'package <...>' statement in the import file
 322  */
 323 static void uci_switch_config(struct uci_context *ctx)
 324 {
 325         struct uci_parse_context *pctx;
 326         struct uci_element *e;
 327         const char *name;
 328
 329         pctx = ctx->pctx;
 330         name = pctx->name;
 331
 332         /* add the last config to main config file list */
 333         if (pctx->package) {
 334                 pctx->package->backend = ctx->backend;
 335                 uci_list_add(&ctx->root, &pctx->package->e.list);
 336
 337                 pctx->package = NULL;
 338                 pctx->section = NULL;
 339         }
 340
 341         if (!name)
 342                 return;
 343
 344         /*
 345          * if an older config under the same name exists, unload it
 346          * ignore errors here, e.g. if the config was not found
 347          */
 348         e = uci_lookup_list(&ctx->root, name);
 349         if (e)
 350                 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
 351         pctx->package = uci_alloc_package(ctx, name);
 352 }
 353
 354 /*
 355  * parse the 'package' uci command (next config package)
 356  */
 357 static void uci_parse_package(struct uci_context *ctx, char **str, bool single)
 358 {
 359         char *name = NULL;
 360
 361         /* command string null-terminated by strtok */
 362         *str += strlen(*str) + 1;
 363
 364         name = next_arg(ctx, str, true, true);
 365         assert_eol(ctx, str);
 366         if (single)
 367                 return;
 368
 369         ctx->pctx->name = name;
 370         uci_switch_config(ctx);
 371 }
 372
 373 /*
 374  * parse the 'config' uci command (open a section)
 375  */
 376 static void uci_parse_config(struct uci_context *ctx, char **str)
 377 {
 378         struct uci_parse_context *pctx = ctx->pctx;
 379         struct uci_element *e;
 380         struct uci_ptr ptr;
 381         char *name = NULL;
 382         char *type = NULL;
 383
 384         uci_fixup_section(ctx, ctx->pctx->section);
 385         if (!ctx->pctx->package) {
 386                 if (!ctx->pctx->name)
 387                         uci_parse_error(ctx, *str, "attempting to import a file without a package name");
 388
 389                 uci_switch_config(ctx);
 390         }
 391
 392         /* command string null-terminated by strtok */
 393         *str += strlen(*str) + 1;
 394
 395         type = next_arg(ctx, str, true, false);
 396         if (!uci_validate_type(type))
 397                 uci_parse_error(ctx, type, "invalid character in field");
 398         name = next_arg(ctx, str, false, true);
 399         assert_eol(ctx, str);
 400
 401         if (!name) {
 402                 ctx->internal = !pctx->merge;
 403                 UCI_NESTED(uci_add_section, ctx, pctx->package, type, &pctx->section);
 404         } else {
 405                 uci_fill_ptr(ctx, &ptr, &pctx->package->e);
 406                 e = uci_lookup_list(&pctx->package->sections, name);
 407                 if (e)
 408                         ptr.s = uci_to_section(e);
 409                 ptr.section = name;
 410                 ptr.value = type;
 411
 412                 ctx->internal = !pctx->merge;
 413                 UCI_NESTED(uci_set, ctx, &ptr);
 414                 pctx->section = uci_to_section(ptr.last);
 415         }
 416 }
 417
 418 /*
 419  * parse the 'option' uci command (open a value)
 420  */
 421 static void uci_parse_option(struct uci_context *ctx, char **str, bool list)
 422 {
 423         struct uci_parse_context *pctx = ctx->pctx;
 424         struct uci_element *e;
 425         struct uci_ptr ptr;
 426         char *name = NULL;
 427         char *value = NULL;
 428
 429         if (!pctx->section)
 430                 uci_parse_error(ctx, *str, "option/list command found before the first section");
 431
 432         /* command string null-terminated by strtok */
 433         *str += strlen(*str) + 1;
 434
 435         name = next_arg(ctx, str, true, true);
 436         value = next_arg(ctx, str, false, false);
 437         assert_eol(ctx, str);
 438
 439         uci_fill_ptr(ctx, &ptr, &pctx->section->e);
 440         e = uci_lookup_list(&pctx->section->options, name);
 441         if (e)
 442                 ptr.o = uci_to_option(e);
 443         ptr.option = name;
 444         ptr.value = value;
 445
 446         ctx->internal = !pctx->merge;
 447         if (list)
 448                 UCI_NESTED(uci_add_list, ctx, &ptr);
 449         else
 450                 UCI_NESTED(uci_set, ctx, &ptr);
 451 }
 452
 453 /*
 454  * parse a complete input line, split up combined commands by ';'
 455  */
 456 static void uci_parse_line(struct uci_context *ctx, bool single)
 457 {
 458         struct uci_parse_context *pctx = ctx->pctx;
 459         char *word, *brk;
 460
 461         word = pctx->buf;
 462         do {
 463                 brk = NULL;
 464                 word = strtok_r(word, " \t", &brk);
 465                 if (!word)
 466                         return;
 467
 468                 switch(word[0]) {
 469                         case 0:
 470                         case '#':
 471                                 return;
 472                         case 'p':
 473                                 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
 474                                         uci_parse_package(ctx, &word, single);
 475                                 else
 476                                         goto invalid;
 477                                 break;
 478                         case 'c':
 479                                 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
 480                                         uci_parse_config(ctx, &word);
 481                                 else
 482                                         goto invalid;
 483                                 break;
 484                         case 'o':
 485                                 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
 486                                         uci_parse_option(ctx, &word, false);
 487                                 else
 488                                         goto invalid;
 489                                 break;
 490                         case 'l':
 491                                 if ((word[1] == 0) || !strcmp(word + 1, "ist"))
 492                                         uci_parse_option(ctx, &word, true);
 493                                 else
 494                                         goto invalid;
 495                                 break;
 496                         default:
 497                                 goto invalid;
 498                 }
 499                 continue;
 500 invalid:
 501                 uci_parse_error(ctx, word, "invalid command");
 502         } while (1);
 503 }
 504
 505 /* max number of characters that escaping adds to the string */
 506 #define UCI_QUOTE_ESCAPE        "'\\''"
 507
 508 /*
 509  * escape an uci string for export
 510  */
 511 static char *uci_escape(struct uci_context *ctx, const char *str)
 512 {
 513         const char *end;
 514         int ofs = 0;
 515
 516         if (!ctx->buf) {
 517                 ctx->bufsz = LINEBUF;
 518                 ctx->buf = malloc(LINEBUF);
 519         }
 520
 521         while (1) {
 522                 int len;
 523
 524                 end = strchr(str, '\'');
 525                 if (!end)
 526                         end = str + strlen(str);
 527                 len = end - str;
 528
 529                 /* make sure that we have enough room in the buffer */
 530                 while (ofs + len + sizeof(UCI_QUOTE_ESCAPE) + 1 > ctx->bufsz) {
 531                         ctx->bufsz *= 2;
 532                         ctx->buf = uci_realloc(ctx, ctx->buf, ctx->bufsz);
 533                 }
 534
 535                 /* copy the string until the character before the quote */
 536                 memcpy(&ctx->buf[ofs], str, len);
 537                 ofs += len;
 538
 539                 /* end of string? return the buffer */
 540                 if (*end == 0)
 541                         break;
 542
 543                 memcpy(&ctx->buf[ofs], UCI_QUOTE_ESCAPE, sizeof(UCI_QUOTE_ESCAPE));
 544                 ofs += strlen(&ctx->buf[ofs]);
 545                 str = end + 1;
 546         }
 547
 548         ctx->buf[ofs] = 0;
 549         return ctx->buf;
 550 }
 551
 552 /*
 553  * export a single config package to a file stream
 554  */
 555 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 556 {
 557         struct uci_context *ctx = p->ctx;
 558         struct uci_element *s, *o, *i;
 559
 560         if (header)
 561                 fprintf(stream, "package '%s'\n", uci_escape(ctx, p->e.name));
 562         uci_foreach_element(&p->sections, s) {
 563                 struct uci_section *sec = uci_to_section(s);
 564                 fprintf(stream, "\nconfig '%s'", uci_escape(ctx, sec->type));
 565                 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
 566                         fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
 567                 fprintf(stream, "\n");
 568                 uci_foreach_element(&sec->options, o) {
 569                         struct uci_option *opt = uci_to_option(o);
 570                         switch(opt->type) {
 571                         case UCI_TYPE_STRING:
 572                                 fprintf(stream, "\toption '%s'", uci_escape(ctx, opt->e.name));
 573                                 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->v.string));
 574                                 break;
 575                         case UCI_TYPE_LIST:
 576                                 uci_foreach_element(&opt->v.list, i) {
 577                                         fprintf(stream, "\tlist '%s'", uci_escape(ctx, opt->e.name));
 578                                         fprintf(stream, " '%s'\n", uci_escape(ctx, i->name));
 579                                 }
 580                                 break;
 581                         default:
 582                                 fprintf(stream, "\t# unknown type for option '%s'\n", uci_escape(ctx, opt->e.name));
 583                                 break;
 584                         }
 585                 }
 586         }
 587         fprintf(stream, "\n");
 588 }
 589
 590 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 591 {
 592         struct uci_element *e;
 593
 594         UCI_HANDLE_ERR(ctx);
 595         UCI_ASSERT(ctx, stream != NULL);
 596
 597         if (package)
 598                 uci_export_package(package, stream, header);
 599         else {
 600                 uci_foreach_element(&ctx->root, e) {
 601                         uci_export_package(uci_to_package(e), stream, header);
 602                 }
 603         }
 604
 605         return 0;
 606 }
 607
 608 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
 609 {
 610         struct uci_parse_context *pctx;
 611         UCI_HANDLE_ERR(ctx);
 612
 613         /* make sure no memory from previous parse attempts is leaked */
 614         uci_cleanup(ctx);
 615
 616         uci_alloc_parse_context(ctx);
 617         pctx = ctx->pctx;
 618         pctx->file = stream;
 619         if (*package && single) {
 620                 pctx->package = *package;
 621                 pctx->merge = true;
 622         }
 623
 624         /*
 625          * If 'name' was supplied, assume that the supplied stream does not contain
 626          * the appropriate 'package <name>' string to specify the config name
 627          * NB: the config file can still override the package name
 628          */
 629         if (name) {
 630                 UCI_ASSERT(ctx, uci_validate_package(name));
 631                 pctx->name = name;
 632         }
 633
 634         while (!feof(pctx->file)) {
 635                 uci_getln(ctx, 0);
 636                 UCI_TRAP_SAVE(ctx, error);
 637                 if (pctx->buf[0])
 638                         uci_parse_line(ctx, single);
 639                 UCI_TRAP_RESTORE(ctx);
 640                 continue;
 641 error:
 642                 if (ctx->flags & UCI_FLAG_PERROR)
 643                         uci_perror(ctx, NULL);
 644                 if ((ctx->err != UCI_ERR_PARSE) ||
 645                         (ctx->flags & UCI_FLAG_STRICT))
 646                         UCI_THROW(ctx, ctx->err);
 647         }
 648
 649         uci_fixup_section(ctx, ctx->pctx->section);
 650         if (!pctx->package && name)
 651                 uci_switch_config(ctx);
 652         if (package)
 653                 *package = pctx->package;
 654         if (pctx->merge)
 655                 pctx->package = NULL;
 656
 657         pctx->name = NULL;
 658         uci_switch_config(ctx);
 659
 660         /* no error happened, we can get rid of the parser context now */
 661         uci_cleanup(ctx);
 662
 663         return 0;
 664 }
 665
 666
 667 static char *uci_config_path(struct uci_context *ctx, const char *name)
 668 {
 669         char *filename;
 670
 671         UCI_ASSERT(ctx, uci_validate_package(name));
 672         filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
 673         sprintf(filename, "%s/%s", ctx->confdir, name);
 674
 675         return filename;
 676 }
 677
 678 static void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 679 {
 680         struct uci_package *p = *package;
 681         FILE *f = NULL;
 682         char *name = NULL;
 683         char *path = NULL;
 684
 685         if (!p->path) {
 686                 if (overwrite)
 687                         p->path = uci_config_path(ctx, p->e.name);
 688                 else
 689                         UCI_THROW(ctx, UCI_ERR_INVAL);
 690         }
 691
 692         /* open the config file for writing now, so that it is locked */
 693         f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
 694
 695         /* flush unsaved changes and reload from delta file */
 696         UCI_TRAP_SAVE(ctx, done);
 697         if (p->has_delta) {
 698                 if (!overwrite) {
 699                         name = uci_strdup(ctx, p->e.name);
 700                         path = uci_strdup(ctx, p->path);
 701                         /* dump our own changes to the delta file */
 702                         if (!uci_list_empty(&p->delta))
 703                                 UCI_INTERNAL(uci_save, ctx, p);
 704
 705                         /*
 706                          * other processes might have modified the config
 707                          * as well. dump and reload
 708                          */
 709                         uci_free_package(&p);
 710                         uci_cleanup(ctx);
 711                         UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
 712
 713                         p->path = path;
 714                         p->has_delta = true;
 715                         *package = p;
 716
 717                         /* freed together with the uci_package */
 718                         path = NULL;
 719                 }
 720
 721                 /* flush delta */
 722                 if (!uci_load_delta(ctx, p, true))
 723                         goto done;
 724         }
 725
 726         rewind(f);
 727         if (ftruncate(fileno(f), 0) < 0)
 728                 UCI_THROW(ctx, UCI_ERR_IO);
 729
 730         uci_export(ctx, f, p, false);
 731         UCI_TRAP_RESTORE(ctx);
 732
 733 done:
 734         if (name)
 735                 free(name);
 736         if (path)
 737                 free(path);
 738         uci_close_stream(f);
 739         if (ctx->err)
 740                 UCI_THROW(ctx, ctx->err);
 741 }
 742
 743
 744 /*
 745  * This function returns the filename by returning the string
 746  * after the last '/' character. By checking for a non-'\0'
 747  * character afterwards, directories are ignored (glob marks
 748  * those with a trailing '/'
 749  */
 750 static inline char *get_filename(char *path)
 751 {
 752         char *p;
 753
 754         p = strrchr(path, '/');
 755         p++;
 756         if (!*p)
 757                 return NULL;
 758         return p;
 759 }
 760
 761 static char **uci_list_config_files(struct uci_context *ctx)
 762 {
 763         char **configs;
 764         glob_t globbuf;
 765         int size, i;
 766         char *buf;
 767         char *dir;
 768
 769         dir = uci_malloc(ctx, strlen(ctx->confdir) + 1 + sizeof("/*"));
 770         sprintf(dir, "%s/*", ctx->confdir);
 771         if (glob(dir, GLOB_MARK, NULL, &globbuf) != 0) {
 772                 free(dir);
 773                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 774         }
 775
 776         size = sizeof(char *) * (globbuf.gl_pathc + 1);
 777         for(i = 0; i < globbuf.gl_pathc; i++) {
 778                 char *p;
 779
 780                 p = get_filename(globbuf.gl_pathv[i]);
 781                 if (!p)
 782                         continue;
 783
 784                 size += strlen(p) + 1;
 785         }
 786
 787         configs = uci_malloc(ctx, size);
 788         buf = (char *) &configs[globbuf.gl_pathc + 1];
 789         for(i = 0; i < globbuf.gl_pathc; i++) {
 790                 char *p;
 791
 792                 p = get_filename(globbuf.gl_pathv[i]);
 793                 if (!p)
 794                         continue;
 795
 796                 if (!uci_validate_package(p))
 797                         continue;
 798
 799                 configs[i] = buf;
 800                 strcpy(buf, p);
 801                 buf += strlen(buf) + 1;
 802         }
 803         free(dir);
 804         globfree(&globbuf);
 805         return configs;
 806 }
 807
 808 static struct uci_package *uci_file_load(struct uci_context *ctx, const char *name)
 809 {
 810         struct uci_package *package = NULL;
 811         char *filename;
 812         bool confdir;
 813         FILE *file = NULL;
 814
 815         switch (name[0]) {
 816         case '.':
 817                 /* relative path outside of /etc/config */
 818                 if (name[1] != '/')
 819                         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 820                 /* fall through */
 821         case '/':
 822                 /* absolute path outside of /etc/config */
 823                 filename = uci_strdup(ctx, name);
 824                 name = strrchr(name, '/') + 1;
 825                 confdir = false;
 826                 break;
 827         default:
 828                 /* config in /etc/config */
 829                 filename = uci_config_path(ctx, name);
 830                 confdir = true;
 831                 break;
 832         }
 833
 834         file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
 835         ctx->err = 0;
 836         UCI_TRAP_SAVE(ctx, done);
 837         UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
 838         UCI_TRAP_RESTORE(ctx);
 839
 840         if (package) {
 841                 package->path = filename;
 842                 package->has_delta = confdir;
 843                 uci_load_delta(ctx, package, false);
 844         }
 845
 846 done:
 847         uci_close_stream(file);
 848         if (ctx->err)
 849                 UCI_THROW(ctx, ctx->err);
 850         return package;
 851 }
 852
 853 __private UCI_BACKEND(uci_file_backend, "file",
 854         .load = uci_file_load,
 855         .commit = uci_file_commit,
 856         .list_configs = uci_list_config_files,
 857 );