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 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, bool complete)
 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         if (complete)
 300                 ptr->flags |= UCI_LOOKUP_COMPLETE;
 301
 302         return 0;
 303 }
 304
 305
 306
 307 /*
 308  * verify that the end of the line or command is reached.
 309  * throw an error if extra arguments are given on the command line
 310  */
 311 static void assert_eol(struct uci_context *ctx, char **str)
 312 {
 313         char *tmp;
 314
 315         skip_whitespace(ctx, str);
 316         tmp = next_arg(ctx, str, false, false);
 317         if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
 318                 uci_parse_error(ctx, *str, "too many arguments");
 319 }
 320
 321 /*
 322  * switch to a different config, either triggered by uci_load, or by a
 323  * 'package <...>' statement in the import file
 324  */
 325 static void uci_switch_config(struct uci_context *ctx)
 326 {
 327         struct uci_parse_context *pctx;
 328         struct uci_element *e;
 329         const char *name;
 330
 331         pctx = ctx->pctx;
 332         name = pctx->name;
 333
 334         /* add the last config to main config file list */
 335         if (pctx->package) {
 336                 pctx->package->backend = ctx->backend;
 337                 uci_list_add(&ctx->root, &pctx->package->e.list);
 338
 339                 pctx->package = NULL;
 340                 pctx->section = NULL;
 341         }
 342
 343         if (!name)
 344                 return;
 345
 346         /*
 347          * if an older config under the same name exists, unload it
 348          * ignore errors here, e.g. if the config was not found
 349          */
 350         e = uci_lookup_list(&ctx->root, name);
 351         if (e)
 352                 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
 353         pctx->package = uci_alloc_package(ctx, name);
 354 }
 355
 356 /*
 357  * parse the 'package' uci command (next config package)
 358  */
 359 static void uci_parse_package(struct uci_context *ctx, char **str, bool single)
 360 {
 361         char *name = NULL;
 362
 363         /* command string null-terminated by strtok */
 364         *str += strlen(*str) + 1;
 365
 366         name = next_arg(ctx, str, true, true);
 367         assert_eol(ctx, str);
 368         if (single)
 369                 return;
 370
 371         ctx->pctx->name = name;
 372         uci_switch_config(ctx);
 373 }
 374
 375 /*
 376  * parse the 'config' uci command (open a section)
 377  */
 378 static void uci_parse_config(struct uci_context *ctx, char **str)
 379 {
 380         struct uci_parse_context *pctx = ctx->pctx;
 381         struct uci_element *e;
 382         struct uci_ptr ptr;
 383         char *name = NULL;
 384         char *type = NULL;
 385
 386         uci_fixup_section(ctx, ctx->pctx->section);
 387         if (!ctx->pctx->package) {
 388                 if (!ctx->pctx->name)
 389                         uci_parse_error(ctx, *str, "attempting to import a file without a package name");
 390
 391                 uci_switch_config(ctx);
 392         }
 393
 394         /* command string null-terminated by strtok */
 395         *str += strlen(*str) + 1;
 396
 397         type = next_arg(ctx, str, true, false);
 398         if (!uci_validate_type(type))
 399                 uci_parse_error(ctx, type, "invalid character in field");
 400         name = next_arg(ctx, str, false, true);
 401         assert_eol(ctx, str);
 402
 403         if (!name) {
 404                 ctx->internal = !pctx->merge;
 405                 UCI_NESTED(uci_add_section, ctx, pctx->package, type, &pctx->section);
 406         } else {
 407                 uci_fill_ptr(ctx, &ptr, &pctx->package->e, false);
 408                 e = uci_lookup_list(&pctx->package->sections, name);
 409                 if (e)
 410                         ptr.s = uci_to_section(e);
 411                 ptr.section = name;
 412                 ptr.value = type;
 413
 414                 ctx->internal = !pctx->merge;
 415                 UCI_NESTED(uci_set, ctx, &ptr);
 416                 pctx->section = uci_to_section(ptr.last);
 417         }
 418 }
 419
 420 /*
 421  * parse the 'option' uci command (open a value)
 422  */
 423 static void uci_parse_option(struct uci_context *ctx, char **str, bool list)
 424 {
 425         struct uci_parse_context *pctx = ctx->pctx;
 426         struct uci_element *e;
 427         struct uci_ptr ptr;
 428         char *name = NULL;
 429         char *value = NULL;
 430
 431         if (!pctx->section)
 432                 uci_parse_error(ctx, *str, "option/list command found before the first section");
 433
 434         /* command string null-terminated by strtok */
 435         *str += strlen(*str) + 1;
 436
 437         name = next_arg(ctx, str, true, true);
 438         value = next_arg(ctx, str, false, false);
 439         assert_eol(ctx, str);
 440
 441         uci_fill_ptr(ctx, &ptr, &pctx->section->e, false);
 442         e = uci_lookup_list(&pctx->section->options, name);
 443         if (e)
 444                 ptr.o = uci_to_option(e);
 445         ptr.option = name;
 446         ptr.value = value;
 447
 448         ctx->internal = !pctx->merge;
 449         if (list)
 450                 UCI_NESTED(uci_add_list, ctx, &ptr);
 451         else
 452                 UCI_NESTED(uci_set, ctx, &ptr);
 453 }
 454
 455 /*
 456  * parse a complete input line, split up combined commands by ';'
 457  */
 458 static void uci_parse_line(struct uci_context *ctx, bool single)
 459 {
 460         struct uci_parse_context *pctx = ctx->pctx;
 461         char *word, *brk;
 462
 463         word = pctx->buf;
 464         do {
 465                 brk = NULL;
 466                 word = strtok_r(word, " \t", &brk);
 467                 if (!word)
 468                         return;
 469
 470                 switch(word[0]) {
 471                         case 0:
 472                         case '#':
 473                                 return;
 474                         case 'p':
 475                                 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
 476                                         uci_parse_package(ctx, &word, single);
 477                                 else
 478                                         goto invalid;
 479                                 break;
 480                         case 'c':
 481                                 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
 482                                         uci_parse_config(ctx, &word);
 483                                 else
 484                                         goto invalid;
 485                                 break;
 486                         case 'o':
 487                                 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
 488                                         uci_parse_option(ctx, &word, false);
 489                                 else
 490                                         goto invalid;
 491                                 break;
 492                         case 'l':
 493                                 if ((word[1] == 0) || !strcmp(word + 1, "ist"))
 494                                         uci_parse_option(ctx, &word, true);
 495                                 else
 496                                         goto invalid;
 497                                 break;
 498                         default:
 499                                 goto invalid;
 500                 }
 501                 continue;
 502 invalid:
 503                 uci_parse_error(ctx, word, "invalid command");
 504         } while (1);
 505 }
 506
 507 /* max number of characters that escaping adds to the string */
 508 #define UCI_QUOTE_ESCAPE        "'\\''"
 509
 510 /*
 511  * escape an uci string for export
 512  */
 513 static char *uci_escape(struct uci_context *ctx, const char *str)
 514 {
 515         const char *end;
 516         int ofs = 0;
 517
 518         if (!ctx->buf) {
 519                 ctx->bufsz = LINEBUF;
 520                 ctx->buf = malloc(LINEBUF);
 521         }
 522
 523         while (1) {
 524                 int len;
 525
 526                 end = strchr(str, '\'');
 527                 if (!end)
 528                         end = str + strlen(str);
 529                 len = end - str;
 530
 531                 /* make sure that we have enough room in the buffer */
 532                 while (ofs + len + sizeof(UCI_QUOTE_ESCAPE) + 1 > ctx->bufsz) {
 533                         ctx->bufsz *= 2;
 534                         ctx->buf = uci_realloc(ctx, ctx->buf, ctx->bufsz);
 535                 }
 536
 537                 /* copy the string until the character before the quote */
 538                 memcpy(&ctx->buf[ofs], str, len);
 539                 ofs += len;
 540
 541                 /* end of string? return the buffer */
 542                 if (*end == 0)
 543                         break;
 544
 545                 memcpy(&ctx->buf[ofs], UCI_QUOTE_ESCAPE, sizeof(UCI_QUOTE_ESCAPE));
 546                 ofs += strlen(&ctx->buf[ofs]);
 547                 str = end + 1;
 548         }
 549
 550         ctx->buf[ofs] = 0;
 551         return ctx->buf;
 552 }
 553
 554 /*
 555  * export a single config package to a file stream
 556  */
 557 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 558 {
 559         struct uci_context *ctx = p->ctx;
 560         struct uci_element *s, *o, *i;
 561
 562         if (header)
 563                 fprintf(stream, "package '%s'\n", uci_escape(ctx, p->e.name));
 564         uci_foreach_element(&p->sections, s) {
 565                 struct uci_section *sec = uci_to_section(s);
 566                 fprintf(stream, "\nconfig '%s'", uci_escape(ctx, sec->type));
 567                 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
 568                         fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
 569                 fprintf(stream, "\n");
 570                 uci_foreach_element(&sec->options, o) {
 571                         struct uci_option *opt = uci_to_option(o);
 572                         switch(opt->type) {
 573                         case UCI_TYPE_STRING:
 574                                 fprintf(stream, "\toption '%s'", uci_escape(ctx, opt->e.name));
 575                                 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->v.string));
 576                                 break;
 577                         case UCI_TYPE_LIST:
 578                                 uci_foreach_element(&opt->v.list, i) {
 579                                         fprintf(stream, "\tlist '%s'", uci_escape(ctx, opt->e.name));
 580                                         fprintf(stream, " '%s'\n", uci_escape(ctx, i->name));
 581                                 }
 582                                 break;
 583                         default:
 584                                 fprintf(stream, "\t# unknown type for option '%s'\n", uci_escape(ctx, opt->e.name));
 585                                 break;
 586                         }
 587                 }
 588         }
 589         fprintf(stream, "\n");
 590 }
 591
 592 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 593 {
 594         struct uci_element *e;
 595
 596         UCI_HANDLE_ERR(ctx);
 597         UCI_ASSERT(ctx, stream != NULL);
 598
 599         if (package)
 600                 uci_export_package(package, stream, header);
 601         else {
 602                 uci_foreach_element(&ctx->root, e) {
 603                         uci_export_package(uci_to_package(e), stream, header);
 604                 }
 605         }
 606
 607         return 0;
 608 }
 609
 610 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
 611 {
 612         struct uci_parse_context *pctx;
 613         UCI_HANDLE_ERR(ctx);
 614
 615         /* make sure no memory from previous parse attempts is leaked */
 616         uci_cleanup(ctx);
 617
 618         uci_alloc_parse_context(ctx);
 619         pctx = ctx->pctx;
 620         pctx->file = stream;
 621         if (*package && single) {
 622                 pctx->package = *package;
 623                 pctx->merge = true;
 624         }
 625
 626         /*
 627          * If 'name' was supplied, assume that the supplied stream does not contain
 628          * the appropriate 'package <name>' string to specify the config name
 629          * NB: the config file can still override the package name
 630          */
 631         if (name) {
 632                 UCI_ASSERT(ctx, uci_validate_package(name));
 633                 pctx->name = name;
 634         }
 635
 636         while (!feof(pctx->file)) {
 637                 uci_getln(ctx, 0);
 638                 UCI_TRAP_SAVE(ctx, error);
 639                 if (pctx->buf[0])
 640                         uci_parse_line(ctx, single);
 641                 UCI_TRAP_RESTORE(ctx);
 642                 continue;
 643 error:
 644                 if (ctx->flags & UCI_FLAG_PERROR)
 645                         uci_perror(ctx, NULL);
 646                 if ((ctx->err != UCI_ERR_PARSE) ||
 647                         (ctx->flags & UCI_FLAG_STRICT))
 648                         UCI_THROW(ctx, ctx->err);
 649         }
 650
 651         uci_fixup_section(ctx, ctx->pctx->section);
 652         if (!pctx->package && name)
 653                 uci_switch_config(ctx);
 654         if (package)
 655                 *package = pctx->package;
 656         if (pctx->merge)
 657                 pctx->package = NULL;
 658
 659         pctx->name = NULL;
 660         uci_switch_config(ctx);
 661
 662         /* no error happened, we can get rid of the parser context now */
 663         uci_cleanup(ctx);
 664
 665         return 0;
 666 }
 667
 668
 669 static char *uci_config_path(struct uci_context *ctx, const char *name)
 670 {
 671         char *filename;
 672
 673         UCI_ASSERT(ctx, uci_validate_package(name));
 674         filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
 675         sprintf(filename, "%s/%s", ctx->confdir, name);
 676
 677         return filename;
 678 }
 679
 680 void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 681 {
 682         struct uci_package *p = *package;
 683         FILE *f = NULL;
 684         char *name = NULL;
 685         char *path = NULL;
 686
 687         if (!p->path) {
 688                 if (overwrite)
 689                         p->path = uci_config_path(ctx, p->e.name);
 690                 else
 691                         UCI_THROW(ctx, UCI_ERR_INVAL);
 692         }
 693
 694         /* open the config file for writing now, so that it is locked */
 695         f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
 696
 697         /* flush unsaved changes and reload from delta file */
 698         UCI_TRAP_SAVE(ctx, done);
 699         if (p->has_delta) {
 700                 if (!overwrite) {
 701                         name = uci_strdup(ctx, p->e.name);
 702                         path = uci_strdup(ctx, p->path);
 703                         /* dump our own changes to the delta file */
 704                         if (!uci_list_empty(&p->delta))
 705                                 UCI_INTERNAL(uci_save, ctx, p);
 706
 707                         /*
 708                          * other processes might have modified the config
 709                          * as well. dump and reload
 710                          */
 711                         uci_free_package(&p);
 712                         uci_cleanup(ctx);
 713                         UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
 714
 715                         p->path = path;
 716                         p->has_delta = true;
 717                         *package = p;
 718
 719                         /* freed together with the uci_package */
 720                         path = NULL;
 721                 }
 722
 723                 /* flush delta */
 724                 if (!uci_load_delta(ctx, p, true))
 725                         goto done;
 726         }
 727
 728         rewind(f);
 729         if (ftruncate(fileno(f), 0) < 0)
 730                 UCI_THROW(ctx, UCI_ERR_IO);
 731
 732         uci_export(ctx, f, p, false);
 733         UCI_TRAP_RESTORE(ctx);
 734
 735 done:
 736         if (name)
 737                 free(name);
 738         if (path)
 739                 free(path);
 740         uci_close_stream(f);
 741         if (ctx->err)
 742                 UCI_THROW(ctx, ctx->err);
 743 }
 744
 745
 746 /*
 747  * This function returns the filename by returning the string
 748  * after the last '/' character. By checking for a non-'\0'
 749  * character afterwards, directories are ignored (glob marks
 750  * those with a trailing '/'
 751  */
 752 static inline char *get_filename(char *path)
 753 {
 754         char *p;
 755
 756         p = strrchr(path, '/');
 757         p++;
 758         if (!*p)
 759                 return NULL;
 760         return p;
 761 }
 762
 763 static char **uci_list_config_files(struct uci_context *ctx)
 764 {
 765         char **configs;
 766         glob_t globbuf;
 767         int size, i;
 768         char *buf;
 769         char *dir;
 770
 771         dir = uci_malloc(ctx, strlen(ctx->confdir) + 1 + sizeof("/*"));
 772         sprintf(dir, "%s/*", ctx->confdir);
 773         if (glob(dir, GLOB_MARK, NULL, &globbuf) != 0) {
 774                 free(dir);
 775                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 776         }
 777
 778         size = sizeof(char *) * (globbuf.gl_pathc + 1);
 779         for(i = 0; i < globbuf.gl_pathc; i++) {
 780                 char *p;
 781
 782                 p = get_filename(globbuf.gl_pathv[i]);
 783                 if (!p)
 784                         continue;
 785
 786                 size += strlen(p) + 1;
 787         }
 788
 789         configs = uci_malloc(ctx, size);
 790         buf = (char *) &configs[globbuf.gl_pathc + 1];
 791         for(i = 0; i < globbuf.gl_pathc; i++) {
 792                 char *p;
 793
 794                 p = get_filename(globbuf.gl_pathv[i]);
 795                 if (!p)
 796                         continue;
 797
 798                 if (!uci_validate_package(p))
 799                         continue;
 800
 801                 configs[i] = buf;
 802                 strcpy(buf, p);
 803                 buf += strlen(buf) + 1;
 804         }
 805         free(dir);
 806         globfree(&globbuf);
 807         return configs;
 808 }
 809
 810 static struct uci_package *uci_file_load(struct uci_context *ctx, const char *name)
 811 {
 812         struct uci_package *package = NULL;
 813         char *filename;
 814         bool confdir;
 815         FILE *file = NULL;
 816
 817         switch (name[0]) {
 818         case '.':
 819                 /* relative path outside of /etc/config */
 820                 if (name[1] != '/')
 821                         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 822                 /* fall through */
 823         case '/':
 824                 /* absolute path outside of /etc/config */
 825                 filename = uci_strdup(ctx, name);
 826                 name = strrchr(name, '/') + 1;
 827                 confdir = false;
 828                 break;
 829         default:
 830                 /* config in /etc/config */
 831                 filename = uci_config_path(ctx, name);
 832                 confdir = true;
 833                 break;
 834         }
 835
 836         file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
 837         ctx->err = 0;
 838         UCI_TRAP_SAVE(ctx, done);
 839         UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
 840         UCI_TRAP_RESTORE(ctx);
 841
 842         if (package) {
 843                 package->path = filename;
 844                 package->has_delta = confdir;
 845                 uci_load_delta(ctx, package, false);
 846         }
 847
 848 done:
 849         uci_close_stream(file);
 850         if (ctx->err)
 851                 UCI_THROW(ctx, ctx->err);
 852         return package;
 853 }
 854
 855 __private UCI_BACKEND(uci_file_backend, "file",
 856         .load = uci_file_load,
 857         .commit = uci_file_commit,
 858         .list_configs = uci_list_config_files,
 859 );