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