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/stat.h>
  22 #include <sys/file.h>
  23 #include <stdbool.h>
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <ctype.h>
  28 #include <glob.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31
  32 #include "uci.h"
  33 #include "uci_internal.h"
  34
  35 #define LINEBUF 32
  36 #define LINEBUF_MAX     4096
  37
  38 /*
  39  * Fetch a new line from the input stream and resize buffer if necessary
  40  */
  41 __private void uci_getln(struct uci_context *ctx, int offset)
  42 {
  43         struct uci_parse_context *pctx = ctx->pctx;
  44         char *p;
  45         int ofs;
  46
  47         if (pctx->buf == NULL) {
  48                 pctx->buf = uci_malloc(ctx, LINEBUF);
  49                 pctx->bufsz = LINEBUF;
  50         }
  51
  52         ofs = offset;
  53         do {
  54                 p = &pctx->buf[ofs];
  55                 p[ofs] = 0;
  56
  57                 p = fgets(p, pctx->bufsz - ofs, pctx->file);
  58                 if (!p || !*p)
  59                         return;
  60
  61                 ofs += strlen(p);
  62                 if (pctx->buf[ofs - 1] == '\n') {
  63                         pctx->line++;
  64                         if (ofs >= 2 && pctx->buf[ofs - 2] == '\r')
  65                                 pctx->buf[ofs - 2] = 0;
  66                         else
  67                                 pctx->buf[ofs - 1] = 0;
  68                         return;
  69                 }
  70
  71                 if (pctx->bufsz > LINEBUF_MAX/2)
  72                         uci_parse_error(ctx, p, "line too long");
  73
  74                 pctx->bufsz *= 2;
  75                 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
  76         } while (1);
  77 }
  78
  79
  80 /*
  81  * parse a character escaped by '\'
  82  * returns true if the escaped character is to be parsed
  83  * returns false if the escaped character is to be ignored
  84  */
  85 static inline bool parse_backslash(struct uci_context *ctx, char **str)
  86 {
  87         /* skip backslash */
  88         *str += 1;
  89
  90         /* undecoded backslash at the end of line, fetch the next line */
  91         if (!**str) {
  92                 *str += 1;
  93                 uci_getln(ctx, *str - ctx->pctx->buf);
  94                 return false;
  95         }
  96
  97         /* FIXME: decode escaped char, necessary? */
  98         return true;
  99 }
 100
 101 /*
 102  * move the string pointer forward until a non-whitespace character or
 103  * EOL is reached
 104  */
 105 static void skip_whitespace(struct uci_context *ctx, char **str)
 106 {
 107 restart:
 108         while (**str && isspace(**str))
 109                 *str += 1;
 110
 111         if (**str == '\\') {
 112                 if (!parse_backslash(ctx, str))
 113                         goto restart;
 114         }
 115 }
 116
 117 static inline void addc(char **dest, char **src)
 118 {
 119         **dest = **src;
 120         *dest += 1;
 121         *src += 1;
 122 }
 123
 124 /*
 125  * parse a double quoted string argument from the command line
 126  */
 127 static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
 128 {
 129         char c;
 130
 131         /* skip quote character */
 132         *str += 1;
 133
 134         while ((c = **str)) {
 135                 switch(c) {
 136                 case '"':
 137                         **target = 0;
 138                         *str += 1;
 139                         return;
 140                 case '\\':
 141                         if (!parse_backslash(ctx, str))
 142                                 continue;
 143                         /* fall through */
 144                 default:
 145                         addc(target, str);
 146                         break;
 147                 }
 148         }
 149         uci_parse_error(ctx, *str, "unterminated \"");
 150 }
 151
 152 /*
 153  * parse a single quoted string argument from the command line
 154  */
 155 static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
 156 {
 157         char c;
 158         /* skip quote character */
 159         *str += 1;
 160
 161         while ((c = **str)) {
 162                 switch(c) {
 163                 case '\'':
 164                         **target = 0;
 165                         *str += 1;
 166                         return;
 167                 default:
 168                         addc(target, str);
 169                 }
 170         }
 171         uci_parse_error(ctx, *str, "unterminated '");
 172 }
 173
 174 /*
 175  * parse a string from the command line and detect the quoting style
 176  */
 177 static void parse_str(struct uci_context *ctx, char **str, char **target)
 178 {
 179         bool next = true;
 180         do {
 181                 switch(**str) {
 182                 case '\'':
 183                         parse_single_quote(ctx, str, target);
 184                         break;
 185                 case '"':
 186                         parse_double_quote(ctx, str, target);
 187                         break;
 188                 case '#':
 189                         **str = 0;
 190                         /* fall through */
 191                 case 0:
 192                         goto done;
 193                 case ';':
 194                         next = false;
 195                         goto done;
 196                 case '\\':
 197                         if (!parse_backslash(ctx, str))
 198                                 continue;
 199                         /* fall through */
 200                 default:
 201                         addc(target, str);
 202                         break;
 203                 }
 204         } while (**str && !isspace(**str));
 205 done:
 206
 207         /*
 208          * if the string was unquoted and we've stopped at a whitespace
 209          * character, skip to the next one, because the whitespace will
 210          * be overwritten by a null byte here
 211          */
 212         if (**str && next)
 213                 *str += 1;
 214
 215         /* terminate the parsed string */
 216         **target = 0;
 217 }
 218
 219 /*
 220  * extract the next argument from the command line
 221  */
 222 static char *next_arg(struct uci_context *ctx, char **str, bool required, bool name)
 223 {
 224         char *val;
 225         char *ptr;
 226
 227         val = ptr = *str;
 228         skip_whitespace(ctx, str);
 229         if(*str[0] == ';') {
 230                 *str[0] = 0;
 231                 *str += 1;
 232         } else {
 233                 parse_str(ctx, str, &ptr);
 234         }
 235         if (!*val) {
 236                 if (required)
 237                         uci_parse_error(ctx, *str, "insufficient arguments");
 238                 goto done;
 239         }
 240
 241         if (name && !uci_validate_name(val))
 242                 uci_parse_error(ctx, val, "invalid character in field");
 243
 244 done:
 245         return val;
 246 }
 247
 248 int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result)
 249 {
 250         UCI_HANDLE_ERR(ctx);
 251         UCI_ASSERT(ctx, str != NULL);
 252         UCI_ASSERT(ctx, result != NULL);
 253
 254         if (ctx->pctx && (ctx->pctx->file != stream))
 255                 uci_cleanup(ctx);
 256
 257         if (!ctx->pctx)
 258                 uci_alloc_parse_context(ctx);
 259
 260         ctx->pctx->file = stream;
 261
 262         if (!*str) {
 263                 uci_getln(ctx, 0);
 264                 *str = ctx->pctx->buf;
 265         }
 266
 267         *result = next_arg(ctx, str, false, false);
 268
 269         return 0;
 270 }
 271
 272 static int
 273 uci_fill_ptr(struct uci_context *ctx, struct uci_ptr *ptr, struct uci_element *e)
 274 {
 275         UCI_ASSERT(ctx, ptr != NULL);
 276         UCI_ASSERT(ctx, e != NULL);
 277
 278         memset(ptr, 0, sizeof(struct uci_ptr));
 279         switch(e->type) {
 280         case UCI_TYPE_OPTION:
 281                 ptr->o = uci_to_option(e);
 282                 goto fill_option;
 283         case UCI_TYPE_SECTION:
 284                 ptr->s = uci_to_section(e);
 285                 goto fill_section;
 286         case UCI_TYPE_PACKAGE:
 287                 ptr->p = uci_to_package(e);
 288                 goto fill_package;
 289         default:
 290                 UCI_THROW(ctx, UCI_ERR_INVAL);
 291         }
 292
 293 fill_option:
 294         ptr->option = ptr->o->e.name;
 295         ptr->s = ptr->o->section;
 296 fill_section:
 297         ptr->section = ptr->s->e.name;
 298         ptr->p = ptr->s->package;
 299 fill_package:
 300         ptr->package = ptr->p->e.name;
 301
 302         ptr->flags |= UCI_LOOKUP_DONE;
 303
 304         return 0;
 305 }
 306
 307
 308
 309 /*
 310  * verify that the end of the line or command is reached.
 311  * throw an error if extra arguments are given on the command line
 312  */
 313 static void assert_eol(struct uci_context *ctx, char **str)
 314 {
 315         char *tmp;
 316
 317         skip_whitespace(ctx, str);
 318         tmp = next_arg(ctx, str, false, false);
 319         if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
 320                 uci_parse_error(ctx, *str, "too many arguments");
 321 }
 322
 323 /*
 324  * switch to a different config, either triggered by uci_load, or by a
 325  * 'package <...>' statement in the import file
 326  */
 327 static void uci_switch_config(struct uci_context *ctx)
 328 {
 329         struct uci_parse_context *pctx;
 330         struct uci_element *e;
 331         const char *name;
 332
 333         pctx = ctx->pctx;
 334         name = pctx->name;
 335
 336         /* add the last config to main config file list */
 337         if (pctx->package) {
 338                 pctx->package->backend = ctx->backend;
 339                 uci_list_add(&ctx->root, &pctx->package->e.list);
 340
 341                 pctx->package = NULL;
 342                 pctx->section = NULL;
 343         }
 344
 345         if (!name)
 346                 return;
 347
 348         /*
 349          * if an older config under the same name exists, unload it
 350          * ignore errors here, e.g. if the config was not found
 351          */
 352         e = uci_lookup_list(&ctx->root, name);
 353         if (e)
 354                 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
 355         pctx->package = uci_alloc_package(ctx, name);
 356 }
 357
 358 /*
 359  * parse the 'package' uci command (next config package)
 360  */
 361 static void uci_parse_package(struct uci_context *ctx, char **str, bool single)
 362 {
 363         char *name = NULL;
 364
 365         /* command string null-terminated by strtok */
 366         *str += strlen(*str) + 1;
 367
 368         name = next_arg(ctx, str, true, true);
 369         assert_eol(ctx, str);
 370         if (single)
 371                 return;
 372
 373         ctx->pctx->name = name;
 374         uci_switch_config(ctx);
 375 }
 376
 377 /*
 378  * parse the 'config' uci command (open a section)
 379  */
 380 static void uci_parse_config(struct uci_context *ctx, char **str)
 381 {
 382         struct uci_parse_context *pctx = ctx->pctx;
 383         struct uci_element *e;
 384         struct uci_ptr ptr;
 385         char *name = NULL;
 386         char *type = NULL;
 387
 388         uci_fixup_section(ctx, ctx->pctx->section);
 389         if (!ctx->pctx->package) {
 390                 if (!ctx->pctx->name)
 391                         uci_parse_error(ctx, *str, "attempting to import a file without a package name");
 392
 393                 uci_switch_config(ctx);
 394         }
 395
 396         /* command string null-terminated by strtok */
 397         *str += strlen(*str) + 1;
 398
 399         type = next_arg(ctx, str, true, false);
 400         if (!uci_validate_type(type))
 401                 uci_parse_error(ctx, type, "invalid character in field");
 402         name = next_arg(ctx, str, false, true);
 403         assert_eol(ctx, str);
 404
 405         if (!name || !name[0]) {
 406                 ctx->internal = !pctx->merge;
 407                 UCI_NESTED(uci_add_section, ctx, pctx->package, type, &pctx->section);
 408         } else {
 409                 uci_fill_ptr(ctx, &ptr, &pctx->package->e);
 410                 e = uci_lookup_list(&pctx->package->sections, name);
 411                 if (e)
 412                         ptr.s = uci_to_section(e);
 413                 ptr.section = name;
 414                 ptr.value = type;
 415
 416                 ctx->internal = !pctx->merge;
 417                 UCI_NESTED(uci_set, ctx, &ptr);
 418                 pctx->section = uci_to_section(ptr.last);
 419         }
 420 }
 421
 422 /*
 423  * parse the 'option' uci command (open a value)
 424  */
 425 static void uci_parse_option(struct uci_context *ctx, char **str, bool list)
 426 {
 427         struct uci_parse_context *pctx = ctx->pctx;
 428         struct uci_element *e;
 429         struct uci_ptr ptr;
 430         char *name = NULL;
 431         char *value = NULL;
 432
 433         if (!pctx->section)
 434                 uci_parse_error(ctx, *str, "option/list command found before the first section");
 435
 436         /* command string null-terminated by strtok */
 437         *str += strlen(*str) + 1;
 438
 439         name = next_arg(ctx, str, true, true);
 440         value = next_arg(ctx, str, false, false);
 441         assert_eol(ctx, str);
 442
 443         uci_fill_ptr(ctx, &ptr, &pctx->section->e);
 444         e = uci_lookup_list(&pctx->section->options, name);
 445         if (e)
 446                 ptr.o = uci_to_option(e);
 447         ptr.option = name;
 448         ptr.value = value;
 449
 450         ctx->internal = !pctx->merge;
 451         if (list)
 452                 UCI_NESTED(uci_add_list, ctx, &ptr);
 453         else
 454                 UCI_NESTED(uci_set, ctx, &ptr);
 455 }
 456
 457 /*
 458  * parse a complete input line, split up combined commands by ';'
 459  */
 460 static void uci_parse_line(struct uci_context *ctx, bool single)
 461 {
 462         struct uci_parse_context *pctx = ctx->pctx;
 463         char *word, *brk;
 464
 465         word = pctx->buf;
 466         do {
 467                 brk = NULL;
 468                 word = strtok_r(word, " \t", &brk);
 469                 if (!word)
 470                         return;
 471
 472                 switch(word[0]) {
 473                         case 0:
 474                         case '#':
 475                                 return;
 476                         case 'p':
 477                                 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
 478                                         uci_parse_package(ctx, &word, single);
 479                                 else
 480                                         goto invalid;
 481                                 break;
 482                         case 'c':
 483                                 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
 484                                         uci_parse_config(ctx, &word);
 485                                 else
 486                                         goto invalid;
 487                                 break;
 488                         case 'o':
 489                                 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
 490                                         uci_parse_option(ctx, &word, false);
 491                                 else
 492                                         goto invalid;
 493                                 break;
 494                         case 'l':
 495                                 if ((word[1] == 0) || !strcmp(word + 1, "ist"))
 496                                         uci_parse_option(ctx, &word, true);
 497                                 else
 498                                         goto invalid;
 499                                 break;
 500                         default:
 501                                 goto invalid;
 502                 }
 503                 continue;
 504 invalid:
 505                 uci_parse_error(ctx, word, "invalid command");
 506         } while (1);
 507 }
 508
 509 /* max number of characters that escaping adds to the string */
 510 #define UCI_QUOTE_ESCAPE        "'\\''"
 511
 512 /*
 513  * escape an uci string for export
 514  */
 515 static const char *uci_escape(struct uci_context *ctx, const char *str)
 516 {
 517         const char *end;
 518         int ofs = 0;
 519
 520         if (!ctx->buf) {
 521                 ctx->bufsz = LINEBUF;
 522                 ctx->buf = malloc(LINEBUF);
 523
 524                 if (!ctx->buf)
 525                         return str;
 526         }
 527
 528         while (1) {
 529                 int len;
 530
 531                 end = strchr(str, '\'');
 532                 if (!end)
 533                         end = str + strlen(str);
 534                 len = end - str;
 535
 536                 /* make sure that we have enough room in the buffer */
 537                 while (ofs + len + sizeof(UCI_QUOTE_ESCAPE) + 1 > ctx->bufsz) {
 538                         ctx->bufsz *= 2;
 539                         ctx->buf = uci_realloc(ctx, ctx->buf, ctx->bufsz);
 540                 }
 541
 542                 /* copy the string until the character before the quote */
 543                 memcpy(&ctx->buf[ofs], str, len);
 544                 ofs += len;
 545
 546                 /* end of string? return the buffer */
 547                 if (*end == 0)
 548                         break;
 549
 550                 memcpy(&ctx->buf[ofs], UCI_QUOTE_ESCAPE, sizeof(UCI_QUOTE_ESCAPE));
 551                 ofs += strlen(&ctx->buf[ofs]);
 552                 str = end + 1;
 553         }
 554
 555         ctx->buf[ofs] = 0;
 556         return ctx->buf;
 557 }
 558
 559 /*
 560  * export a single config package to a file stream
 561  */
 562 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 563 {
 564         struct uci_context *ctx = p->ctx;
 565         struct uci_element *s, *o, *i;
 566
 567         if (header)
 568                 fprintf(stream, "package %s\n", uci_escape(ctx, p->e.name));
 569         uci_foreach_element(&p->sections, s) {
 570                 struct uci_section *sec = uci_to_section(s);
 571                 fprintf(stream, "\nconfig %s", uci_escape(ctx, sec->type));
 572                 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
 573                         fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
 574                 fprintf(stream, "\n");
 575                 uci_foreach_element(&sec->options, o) {
 576                         struct uci_option *opt = uci_to_option(o);
 577                         switch(opt->type) {
 578                         case UCI_TYPE_STRING:
 579                                 fprintf(stream, "\toption %s", uci_escape(ctx, opt->e.name));
 580                                 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->v.string));
 581                                 break;
 582                         case UCI_TYPE_LIST:
 583                                 uci_foreach_element(&opt->v.list, i) {
 584                                         fprintf(stream, "\tlist %s", uci_escape(ctx, opt->e.name));
 585                                         fprintf(stream, " '%s'\n", uci_escape(ctx, i->name));
 586                                 }
 587                                 break;
 588                         default:
 589                                 fprintf(stream, "\t# unknown type for option '%s'\n", uci_escape(ctx, opt->e.name));
 590                                 break;
 591                         }
 592                 }
 593         }
 594         fprintf(stream, "\n");
 595 }
 596
 597 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 598 {
 599         struct uci_element *e;
 600
 601         UCI_HANDLE_ERR(ctx);
 602         UCI_ASSERT(ctx, stream != NULL);
 603
 604         if (package)
 605                 uci_export_package(package, stream, header);
 606         else {
 607                 uci_foreach_element(&ctx->root, e) {
 608                         uci_export_package(uci_to_package(e), stream, header);
 609                 }
 610         }
 611
 612         return 0;
 613 }
 614
 615 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
 616 {
 617         struct uci_parse_context *pctx;
 618         UCI_HANDLE_ERR(ctx);
 619
 620         /* make sure no memory from previous parse attempts is leaked */
 621         uci_cleanup(ctx);
 622
 623         uci_alloc_parse_context(ctx);
 624         pctx = ctx->pctx;
 625         pctx->file = stream;
 626         if (package && *package && single) {
 627                 pctx->package = *package;
 628                 pctx->merge = true;
 629         }
 630
 631         /*
 632          * If 'name' was supplied, assume that the supplied stream does not contain
 633          * the appropriate 'package <name>' string to specify the config name
 634          * NB: the config file can still override the package name
 635          */
 636         if (name) {
 637                 UCI_ASSERT(ctx, uci_validate_package(name));
 638                 pctx->name = name;
 639         }
 640
 641         while (!feof(pctx->file)) {
 642                 uci_getln(ctx, 0);
 643                 UCI_TRAP_SAVE(ctx, error);
 644                 if (pctx->buf[0])
 645                         uci_parse_line(ctx, single);
 646                 UCI_TRAP_RESTORE(ctx);
 647                 continue;
 648 error:
 649                 if (ctx->flags & UCI_FLAG_PERROR)
 650                         uci_perror(ctx, NULL);
 651                 if ((ctx->err != UCI_ERR_PARSE) ||
 652                         (ctx->flags & UCI_FLAG_STRICT))
 653                         UCI_THROW(ctx, ctx->err);
 654         }
 655
 656         uci_fixup_section(ctx, ctx->pctx->section);
 657         if (!pctx->package && name)
 658                 uci_switch_config(ctx);
 659         if (package)
 660                 *package = pctx->package;
 661         if (pctx->merge)
 662                 pctx->package = NULL;
 663
 664         pctx->name = NULL;
 665         uci_switch_config(ctx);
 666
 667         /* no error happened, we can get rid of the parser context now */
 668         uci_cleanup(ctx);
 669
 670         return 0;
 671 }
 672
 673
 674 static char *uci_config_path(struct uci_context *ctx, const char *name)
 675 {
 676         char *filename;
 677
 678         UCI_ASSERT(ctx, uci_validate_package(name));
 679         filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
 680         sprintf(filename, "%s/%s", ctx->confdir, name);
 681
 682         return filename;
 683 }
 684
 685 static void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 686 {
 687         struct uci_package *p = *package;
 688         FILE *f1, *f2 = NULL;
 689         char *name = NULL;
 690         char *path = NULL;
 691         char *filename = NULL;
 692         struct stat statbuf;
 693         bool do_rename = false;
 694
 695         if (!p->path) {
 696                 if (overwrite)
 697                         p->path = uci_config_path(ctx, p->e.name);
 698                 else
 699                         UCI_THROW(ctx, UCI_ERR_INVAL);
 700         }
 701
 702         if ((asprintf(&filename, "%s/.%s.uci-XXXXXX", ctx->confdir, p->e.name) < 0) || !filename)
 703                 UCI_THROW(ctx, UCI_ERR_MEM);
 704
 705         if (!mktemp(filename))
 706                 *filename = 0;
 707
 708         if (!*filename) {
 709                 free(filename);
 710                 UCI_THROW(ctx, UCI_ERR_IO);
 711         }
 712
 713         if ((stat(filename, &statbuf) == 0) && ((statbuf.st_mode & S_IFMT) != S_IFREG))
 714                 UCI_THROW(ctx, UCI_ERR_IO);
 715
 716         /* open the config file for writing now, so that it is locked */
 717         f1 = uci_open_stream(ctx, p->path, SEEK_SET, false, false);
 718
 719         /* flush unsaved changes and reload from delta file */
 720         UCI_TRAP_SAVE(ctx, done);
 721         if (p->has_delta) {
 722                 if (!overwrite) {
 723                         name = uci_strdup(ctx, p->e.name);
 724                         path = uci_strdup(ctx, p->path);
 725                         /* dump our own changes to the delta file */
 726                         if (!uci_list_empty(&p->delta))
 727                                 UCI_INTERNAL(uci_save, ctx, p);
 728
 729                         /*
 730                          * other processes might have modified the config
 731                          * as well. dump and reload
 732                          */
 733                         uci_free_package(&p);
 734                         uci_cleanup(ctx);
 735                         UCI_INTERNAL(uci_import, ctx, f1, name, &p, true);
 736
 737                         p->path = path;
 738                         p->has_delta = true;
 739                         *package = p;
 740
 741                         /* freed together with the uci_package */
 742                         path = NULL;
 743                 }
 744
 745                 /* flush delta */
 746                 if (!uci_load_delta(ctx, p, true))
 747                         goto done;
 748         }
 749
 750         f2 = uci_open_stream(ctx, filename, SEEK_SET, true, true);
 751         uci_export(ctx, f2, p, false);
 752
 753         fflush(f2);
 754         fsync(fileno(f2));
 755         uci_close_stream(f2);
 756
 757         do_rename = true;
 758
 759         UCI_TRAP_RESTORE(ctx);
 760
 761 done:
 762         free(name);
 763         free(path);
 764         uci_close_stream(f1);
 765         if (do_rename && rename(filename, p->path)) {
 766                 unlink(filename);
 767                 UCI_THROW(ctx, UCI_ERR_IO);
 768         }
 769         free(filename);
 770         sync();
 771         if (ctx->err)
 772                 UCI_THROW(ctx, ctx->err);
 773 }
 774
 775
 776 /*
 777  * This function returns the filename by returning the string
 778  * after the last '/' character. By checking for a non-'\0'
 779  * character afterwards, directories are ignored (glob marks
 780  * those with a trailing '/'
 781  */
 782 static inline char *get_filename(char *path)
 783 {
 784         char *p;
 785
 786         p = strrchr(path, '/');
 787         p++;
 788         if (!*p)
 789                 return NULL;
 790         return p;
 791 }
 792
 793 static char **uci_list_config_files(struct uci_context *ctx)
 794 {
 795         char **configs;
 796         glob_t globbuf;
 797         int size, i;
 798         char *buf;
 799         char *dir;
 800
 801         dir = uci_malloc(ctx, strlen(ctx->confdir) + 1 + sizeof("/*"));
 802         sprintf(dir, "%s/*", ctx->confdir);
 803         if (glob(dir, GLOB_MARK, NULL, &globbuf) != 0) {
 804                 free(dir);
 805                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 806         }
 807
 808         size = sizeof(char *) * (globbuf.gl_pathc + 1);
 809         for(i = 0; i < globbuf.gl_pathc; i++) {
 810                 char *p;
 811
 812                 p = get_filename(globbuf.gl_pathv[i]);
 813                 if (!p)
 814                         continue;
 815
 816                 size += strlen(p) + 1;
 817         }
 818
 819         configs = uci_malloc(ctx, size);
 820         buf = (char *) &configs[globbuf.gl_pathc + 1];
 821         for(i = 0; i < globbuf.gl_pathc; i++) {
 822                 char *p;
 823
 824                 p = get_filename(globbuf.gl_pathv[i]);
 825                 if (!p)
 826                         continue;
 827
 828                 if (!uci_validate_package(p))
 829                         continue;
 830
 831                 configs[i] = buf;
 832                 strcpy(buf, p);
 833                 buf += strlen(buf) + 1;
 834         }
 835         free(dir);
 836         globfree(&globbuf);
 837         return configs;
 838 }
 839
 840 static struct uci_package *uci_file_load(struct uci_context *ctx, const char *name)
 841 {
 842         struct uci_package *package = NULL;
 843         char *filename;
 844         bool confdir;
 845         FILE *file = NULL;
 846
 847         switch (name[0]) {
 848         case '.':
 849                 /* relative path outside of /etc/config */
 850                 if (name[1] != '/')
 851                         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 852                 /* fall through */
 853         case '/':
 854                 /* absolute path outside of /etc/config */
 855                 filename = uci_strdup(ctx, name);
 856                 name = strrchr(name, '/') + 1;
 857                 confdir = false;
 858                 break;
 859         default:
 860                 /* config in /etc/config */
 861                 filename = uci_config_path(ctx, name);
 862                 confdir = true;
 863                 break;
 864         }
 865
 866         UCI_TRAP_SAVE(ctx, done);
 867         file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
 868         ctx->err = 0;
 869         UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
 870         UCI_TRAP_RESTORE(ctx);
 871
 872         if (package) {
 873                 package->path = filename;
 874                 package->has_delta = confdir;
 875                 uci_load_delta(ctx, package, false);
 876         }
 877
 878 done:
 879         uci_close_stream(file);
 880         if (ctx->err) {
 881                 free(filename);
 882                 UCI_THROW(ctx, ctx->err);
 883         }
 884         return package;
 885 }
 886
 887 __private UCI_BACKEND(uci_file_backend, "file",
 888         .load = uci_file_load,
 889         .commit = uci_file_commit,
 890         .list_configs = uci_list_config_files,
 891 );