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         /* It takes 2 slots for fgets to read 1 char. */
  52         if (offset >= pctx->bufsz - 1) {
  53                 pctx->bufsz *= 2;
  54                 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
  55         }
  56
  57         ofs = offset;
  58         do {
  59                 p = &pctx->buf[ofs];
  60                 p[0] = 0;
  61
  62                 p = fgets(p, pctx->bufsz - ofs, pctx->file);
  63                 if (!p || !*p)
  64                         return;
  65
  66                 ofs += strlen(p);
  67                 if (pctx->buf[ofs - 1] == '\n') {
  68                         pctx->line++;
  69                         return;
  70                 }
  71
  72                 if (pctx->bufsz > LINEBUF_MAX/2)
  73                         uci_parse_error(ctx, "line too long");
  74
  75                 pctx->bufsz *= 2;
  76                 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
  77         } while (1);
  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 bool parse_backslash(struct uci_context *ctx)
  86 {
  87         struct uci_parse_context *pctx = ctx->pctx;
  88
  89         /* skip backslash */
  90         pctx->pos += 1;
  91
  92         /* undecoded backslash at the end of line, fetch the next line */
  93         if (!pctx_cur_char(pctx) ||
  94             pctx_cur_char(pctx) == '\n' ||
  95             (pctx_cur_char(pctx) == '\r' &&
  96              pctx_char(pctx, pctx_pos(pctx) + 1) == '\n' &&
  97              !pctx_char(pctx, pctx_pos(pctx) + 2))) {
  98                 uci_getln(ctx, pctx->pos);
  99                 return false;
 100         }
 101
 102         /* FIXME: decode escaped char, necessary? */
 103         return true;
 104 }
 105
 106 /*
 107  * move the string pointer forward until a non-whitespace character or
 108  * EOL is reached
 109  */
 110 static void skip_whitespace(struct uci_context *ctx)
 111 {
 112         struct uci_parse_context *pctx = ctx->pctx;
 113
 114         while (pctx_cur_char(pctx) && isspace(pctx_cur_char(pctx)))
 115                 pctx->pos += 1;
 116 }
 117
 118 static inline void addc(struct uci_context *ctx, int *pos_dest, int *pos_src)
 119 {
 120         struct uci_parse_context *pctx = ctx->pctx;
 121
 122         pctx_char(pctx, *pos_dest) = pctx_char(pctx, *pos_src);
 123         *pos_dest += 1;
 124         *pos_src += 1;
 125 }
 126
 127 /*
 128  * parse a double quoted string argument from the command line
 129  */
 130 static void parse_double_quote(struct uci_context *ctx, int *target)
 131 {
 132         struct uci_parse_context *pctx = ctx->pctx;
 133         char c;
 134
 135         /* skip quote character */
 136         pctx->pos += 1;
 137
 138         while (1) {
 139                 c = pctx_cur_char(pctx);
 140                 switch(c) {
 141                 case '"':
 142                         pctx->pos += 1;
 143                         return;
 144                 case 0:
 145                         /* Multi-line str value */
 146                         uci_getln(ctx, pctx->pos);
 147                         if (!pctx_cur_char(pctx)) {
 148                                 uci_parse_error(ctx, "EOF with unterminated \"");
 149                         }
 150                         break;
 151                 case '\\':
 152                         if (!parse_backslash(ctx))
 153                                 continue;
 154                         /* fall through */
 155                 default:
 156                         addc(ctx, target, &pctx->pos);
 157                         break;
 158                 }
 159         }
 160 }
 161
 162 /*
 163  * parse a single quoted string argument from the command line
 164  */
 165 static void parse_single_quote(struct uci_context *ctx, int *target)
 166 {
 167         struct uci_parse_context *pctx = ctx->pctx;
 168         char c;
 169         /* skip quote character */
 170         pctx->pos += 1;
 171
 172         while (1) {
 173                 c = pctx_cur_char(pctx);
 174                 switch(c) {
 175                 case '\'':
 176                         pctx->pos += 1;
 177                         return;
 178                 case 0:
 179                         /* Multi-line str value */
 180                         uci_getln(ctx, pctx->pos);
 181                         if (!pctx_cur_char(pctx))
 182                                 uci_parse_error(ctx, "EOF with unterminated '");
 183
 184                         break;
 185                 default:
 186                         addc(ctx, target, &pctx->pos);
 187                 }
 188         }
 189 }
 190
 191 /*
 192  * parse a string from the command line and detect the quoting style
 193  */
 194 static void parse_str(struct uci_context *ctx, int *target)
 195 {
 196         struct uci_parse_context *pctx = ctx->pctx;
 197         bool next = true;
 198         do {
 199                 switch(pctx_cur_char(pctx)) {
 200                 case '\'':
 201                         parse_single_quote(ctx, target);
 202                         break;
 203                 case '"':
 204                         parse_double_quote(ctx, target);
 205                         break;
 206                 case '#':
 207                         pctx_cur_char(pctx) = 0;
 208                         /* fall through */
 209                 case 0:
 210                         goto done;
 211                 case ';':
 212                         next = false;
 213                         goto done;
 214                 case '\\':
 215                         if (!parse_backslash(ctx))
 216                                 continue;
 217                         /* fall through */
 218                 default:
 219                         addc(ctx, target, &pctx->pos);
 220                         break;
 221                 }
 222         } while (pctx_cur_char(pctx) && !isspace(pctx_cur_char(pctx)));
 223 done:
 224
 225         /*
 226          * if the string was unquoted and we've stopped at a whitespace
 227          * character, skip to the next one, because the whitespace will
 228          * be overwritten by a null byte here
 229          */
 230         if (pctx_cur_char(pctx) && next)
 231                 pctx->pos += 1;
 232
 233         /* terminate the parsed string */
 234         pctx_char(pctx, *target) = 0;
 235 }
 236
 237 /*
 238  * extract the next argument from the command line
 239  */
 240 static int next_arg(struct uci_context *ctx, bool required, bool name)
 241 {
 242         struct uci_parse_context *pctx = ctx->pctx;
 243         int val, ptr;
 244
 245         skip_whitespace(ctx);
 246         val = ptr = pctx_pos(pctx);
 247         if (pctx_cur_char(pctx) == ';') {
 248                 pctx_cur_char(pctx) = 0;
 249                 pctx->pos += 1;
 250         } else {
 251                 parse_str(ctx, &ptr);
 252         }
 253         if (!pctx_char(pctx, val)) {
 254                 if (required)
 255                         uci_parse_error(ctx, "insufficient arguments");
 256                 goto done;
 257         }
 258
 259         if (name && !uci_validate_name(pctx_str(pctx, val)))
 260                 uci_parse_error(ctx, "invalid character in name field");
 261
 262 done:
 263         return val;
 264 }
 265
 266 int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result)
 267 {
 268         int ofs_result;
 269
 270         UCI_HANDLE_ERR(ctx);
 271         UCI_ASSERT(ctx, str != NULL);
 272         UCI_ASSERT(ctx, result != NULL);
 273
 274         if (ctx->pctx && (ctx->pctx->file != stream))
 275                 uci_cleanup(ctx);
 276
 277         if (!ctx->pctx)
 278                 uci_alloc_parse_context(ctx);
 279
 280         ctx->pctx->file = stream;
 281
 282         if (!*str) {
 283                 uci_getln(ctx, 0);
 284                 *str = ctx->pctx->buf;
 285         } else {
 286                 UCI_ASSERT(ctx, ctx->pctx->pos == *str - ctx->pctx->buf);
 287         }
 288
 289         /*FIXME do we need to skip empty lines? */
 290         ofs_result = next_arg(ctx, false, false);
 291         *result = pctx_str(ctx->pctx, ofs_result);
 292         *str = pctx_cur_str(ctx->pctx);
 293
 294         return 0;
 295 }
 296
 297 static int
 298 uci_fill_ptr(struct uci_context *ctx, struct uci_ptr *ptr, struct uci_element *e)
 299 {
 300         UCI_ASSERT(ctx, ptr != NULL);
 301         UCI_ASSERT(ctx, e != NULL);
 302
 303         memset(ptr, 0, sizeof(struct uci_ptr));
 304         switch(e->type) {
 305         case UCI_TYPE_OPTION:
 306                 ptr->o = uci_to_option(e);
 307                 goto fill_option;
 308         case UCI_TYPE_SECTION:
 309                 ptr->s = uci_to_section(e);
 310                 goto fill_section;
 311         case UCI_TYPE_PACKAGE:
 312                 ptr->p = uci_to_package(e);
 313                 goto fill_package;
 314         default:
 315                 UCI_THROW(ctx, UCI_ERR_INVAL);
 316         }
 317
 318 fill_option:
 319         ptr->option = ptr->o->e.name;
 320         ptr->s = ptr->o->section;
 321 fill_section:
 322         ptr->section = ptr->s->e.name;
 323         ptr->p = ptr->s->package;
 324 fill_package:
 325         ptr->package = ptr->p->e.name;
 326
 327         ptr->flags |= UCI_LOOKUP_DONE;
 328
 329         return 0;
 330 }
 331
 332
 333
 334 /*
 335  * verify that the end of the line or command is reached.
 336  * throw an error if extra arguments are given on the command line
 337  */
 338 static void assert_eol(struct uci_context *ctx)
 339 {
 340         char *tmp;
 341         int ofs_tmp;
 342
 343         skip_whitespace(ctx);
 344         ofs_tmp = next_arg(ctx, false, false);
 345         tmp = pctx_str(ctx->pctx, ofs_tmp);
 346         if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
 347                 uci_parse_error(ctx, "too many arguments");
 348 }
 349
 350 /*
 351  * switch to a different config, either triggered by uci_load, or by a
 352  * 'package <...>' statement in the import file
 353  */
 354 static void uci_switch_config(struct uci_context *ctx)
 355 {
 356         struct uci_parse_context *pctx;
 357         struct uci_element *e;
 358         const char *name;
 359
 360         pctx = ctx->pctx;
 361         name = pctx->name;
 362
 363         /* add the last config to main config file list */
 364         if (pctx->package) {
 365                 pctx->package->backend = ctx->backend;
 366                 uci_list_add(&ctx->root, &pctx->package->e.list);
 367
 368                 pctx->package = NULL;
 369                 pctx->section = NULL;
 370         }
 371
 372         if (!name)
 373                 return;
 374
 375         /*
 376          * if an older config under the same name exists, unload it
 377          * ignore errors here, e.g. if the config was not found
 378          */
 379         e = uci_lookup_list(&ctx->root, name);
 380         if (e)
 381                 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
 382         pctx->package = uci_alloc_package(ctx, name);
 383 }
 384
 385 /*
 386  * parse the 'package' uci command (next config package)
 387  */
 388 static void uci_parse_package(struct uci_context *ctx, bool single)
 389 {
 390         struct uci_parse_context *pctx = ctx->pctx;
 391         int ofs_name;
 392         char *name;
 393
 394         /* command string null-terminated by strtok */
 395         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 396
 397         ofs_name = next_arg(ctx, true, true);
 398         name = pctx_str(pctx, ofs_name);
 399         assert_eol(ctx);
 400         if (single)
 401                 return;
 402
 403         ctx->pctx->name = name;
 404         uci_switch_config(ctx);
 405 }
 406
 407 /*
 408  * parse the 'config' uci command (open a section)
 409  */
 410 static void uci_parse_config(struct uci_context *ctx)
 411 {
 412         struct uci_parse_context *pctx = ctx->pctx;
 413         struct uci_element *e;
 414         struct uci_ptr ptr;
 415         int ofs_name, ofs_type;
 416         char *name;
 417         char *type;
 418
 419         uci_fixup_section(ctx, ctx->pctx->section);
 420         if (!ctx->pctx->package) {
 421                 if (!ctx->pctx->name)
 422                         uci_parse_error(ctx, "attempting to import a file without a package name");
 423
 424                 uci_switch_config(ctx);
 425         }
 426
 427         /* command string null-terminated by strtok */
 428         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 429
 430         ofs_type = next_arg(ctx, true, false);
 431         type = pctx_str(pctx, ofs_type);
 432         if (!uci_validate_type(type))
 433                 uci_parse_error(ctx, "invalid character in type field");
 434
 435         ofs_name = next_arg(ctx, false, true);
 436         type = pctx_str(pctx, ofs_type);
 437         name = pctx_str(pctx, ofs_name);
 438         assert_eol(ctx);
 439
 440         if (!name || !name[0]) {
 441                 ctx->internal = !pctx->merge;
 442                 UCI_NESTED(uci_add_section, ctx, pctx->package, type, &pctx->section);
 443         } else {
 444                 uci_fill_ptr(ctx, &ptr, &pctx->package->e);
 445                 e = uci_lookup_list(&pctx->package->sections, name);
 446                 if (e)
 447                         ptr.s = uci_to_section(e);
 448                 ptr.section = name;
 449                 ptr.value = type;
 450
 451                 ctx->internal = !pctx->merge;
 452                 UCI_NESTED(uci_set, ctx, &ptr);
 453                 pctx->section = uci_to_section(ptr.last);
 454         }
 455 }
 456
 457 /*
 458  * parse the 'option' uci command (open a value)
 459  */
 460 static void uci_parse_option(struct uci_context *ctx, bool list)
 461 {
 462         struct uci_parse_context *pctx = ctx->pctx;
 463         struct uci_element *e;
 464         struct uci_ptr ptr;
 465         int ofs_name, ofs_value;
 466         char *name = NULL;
 467         char *value = NULL;
 468
 469         if (!pctx->section)
 470                 uci_parse_error(ctx, "option/list command found before the first section");
 471
 472         /* command string null-terminated by strtok */
 473         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 474
 475         ofs_name = next_arg(ctx, true, true);
 476         ofs_value = next_arg(ctx, false, false);
 477         name = pctx_str(pctx, ofs_name);
 478         value = pctx_str(pctx, ofs_value);
 479         assert_eol(ctx);
 480
 481         uci_fill_ptr(ctx, &ptr, &pctx->section->e);
 482         e = uci_lookup_list(&pctx->section->options, name);
 483         if (e)
 484                 ptr.o = uci_to_option(e);
 485         ptr.option = name;
 486         ptr.value = value;
 487
 488         ctx->internal = !pctx->merge;
 489         if (list)
 490                 UCI_NESTED(uci_add_list, ctx, &ptr);
 491         else
 492                 UCI_NESTED(uci_set, ctx, &ptr);
 493 }
 494
 495 /*
 496  * parse a complete input line, split up combined commands by ';'
 497  */
 498 static void uci_parse_line(struct uci_context *ctx, bool single)
 499 {
 500         struct uci_parse_context *pctx = ctx->pctx;
 501         char *word;
 502
 503         /* Skip whitespace characters at the start of line */
 504         skip_whitespace(ctx);
 505         do {
 506                 word = strtok(pctx_cur_str(pctx), " \t");
 507                 if (!word)
 508                         return;
 509
 510                 switch(word[0]) {
 511                         case 0:
 512                         case '#':
 513                                 return;
 514                         case 'p':
 515                                 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
 516                                         uci_parse_package(ctx, single);
 517                                 else
 518                                         goto invalid;
 519                                 break;
 520                         case 'c':
 521                                 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
 522                                         uci_parse_config(ctx);
 523                                 else
 524                                         goto invalid;
 525                                 break;
 526                         case 'o':
 527                                 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
 528                                         uci_parse_option(ctx, false);
 529                                 else
 530                                         goto invalid;
 531                                 break;
 532                         case 'l':
 533                                 if ((word[1] == 0) || !strcmp(word + 1, "ist"))
 534                                         uci_parse_option(ctx, true);
 535                                 else
 536                                         goto invalid;
 537                                 break;
 538                         default:
 539                                 goto invalid;
 540                 }
 541                 continue;
 542 invalid:
 543                 uci_parse_error(ctx, "invalid command");
 544         } while (1);
 545 }
 546
 547 /* max number of characters that escaping adds to the string */
 548 #define UCI_QUOTE_ESCAPE        "'\\''"
 549
 550 /*
 551  * escape an uci string for export
 552  */
 553 static const char *uci_escape(struct uci_context *ctx, const char *str)
 554 {
 555         const char *end;
 556         int ofs = 0;
 557
 558         if (!ctx->buf) {
 559                 ctx->bufsz = LINEBUF;
 560                 ctx->buf = malloc(LINEBUF);
 561
 562                 if (!ctx->buf)
 563                         return str;
 564         }
 565
 566         while (1) {
 567                 int len;
 568
 569                 end = strchr(str, '\'');
 570                 if (!end)
 571                         end = str + strlen(str);
 572                 len = end - str;
 573
 574                 /* make sure that we have enough room in the buffer */
 575                 while (ofs + len + sizeof(UCI_QUOTE_ESCAPE) + 1 > ctx->bufsz) {
 576                         ctx->bufsz *= 2;
 577                         ctx->buf = uci_realloc(ctx, ctx->buf, ctx->bufsz);
 578                 }
 579
 580                 /* copy the string until the character before the quote */
 581                 memcpy(&ctx->buf[ofs], str, len);
 582                 ofs += len;
 583
 584                 /* end of string? return the buffer */
 585                 if (*end == 0)
 586                         break;
 587
 588                 memcpy(&ctx->buf[ofs], UCI_QUOTE_ESCAPE, sizeof(UCI_QUOTE_ESCAPE));
 589                 ofs += strlen(&ctx->buf[ofs]);
 590                 str = end + 1;
 591         }
 592
 593         ctx->buf[ofs] = 0;
 594         return ctx->buf;
 595 }
 596
 597 /*
 598  * export a single config package to a file stream
 599  */
 600 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 601 {
 602         struct uci_context *ctx = p->ctx;
 603         struct uci_element *s, *o, *i;
 604
 605         if (header)
 606                 fprintf(stream, "package %s\n", uci_escape(ctx, p->e.name));
 607         uci_foreach_element(&p->sections, s) {
 608                 struct uci_section *sec = uci_to_section(s);
 609                 fprintf(stream, "\nconfig %s", uci_escape(ctx, sec->type));
 610                 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
 611                         fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
 612                 fprintf(stream, "\n");
 613                 uci_foreach_element(&sec->options, o) {
 614                         struct uci_option *opt = uci_to_option(o);
 615                         switch(opt->type) {
 616                         case UCI_TYPE_STRING:
 617                                 fprintf(stream, "\toption %s", uci_escape(ctx, opt->e.name));
 618                                 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->v.string));
 619                                 break;
 620                         case UCI_TYPE_LIST:
 621                                 uci_foreach_element(&opt->v.list, i) {
 622                                         fprintf(stream, "\tlist %s", uci_escape(ctx, opt->e.name));
 623                                         fprintf(stream, " '%s'\n", uci_escape(ctx, i->name));
 624                                 }
 625                                 break;
 626                         default:
 627                                 fprintf(stream, "\t# unknown type for option '%s'\n", uci_escape(ctx, opt->e.name));
 628                                 break;
 629                         }
 630                 }
 631         }
 632         fprintf(stream, "\n");
 633 }
 634
 635 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 636 {
 637         struct uci_element *e;
 638
 639         UCI_HANDLE_ERR(ctx);
 640         UCI_ASSERT(ctx, stream != NULL);
 641
 642         if (package)
 643                 uci_export_package(package, stream, header);
 644         else {
 645                 uci_foreach_element(&ctx->root, e) {
 646                         uci_export_package(uci_to_package(e), stream, header);
 647                 }
 648         }
 649
 650         return 0;
 651 }
 652
 653 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
 654 {
 655         struct uci_parse_context *pctx;
 656         UCI_HANDLE_ERR(ctx);
 657
 658         /* make sure no memory from previous parse attempts is leaked */
 659         uci_cleanup(ctx);
 660
 661         uci_alloc_parse_context(ctx);
 662         pctx = ctx->pctx;
 663         pctx->file = stream;
 664         if (package && *package && single) {
 665                 pctx->package = *package;
 666                 pctx->merge = true;
 667         }
 668
 669         /*
 670          * If 'name' was supplied, assume that the supplied stream does not contain
 671          * the appropriate 'package <name>' string to specify the config name
 672          * NB: the config file can still override the package name
 673          */
 674         if (name) {
 675                 UCI_ASSERT(ctx, uci_validate_package(name));
 676                 pctx->name = name;
 677         }
 678
 679         while (!feof(pctx->file)) {
 680                 pctx->pos = 0;
 681                 uci_getln(ctx, 0);
 682                 UCI_TRAP_SAVE(ctx, error);
 683                 if (pctx->buf[0])
 684                         uci_parse_line(ctx, single);
 685                 UCI_TRAP_RESTORE(ctx);
 686                 continue;
 687 error:
 688                 if (ctx->flags & UCI_FLAG_PERROR)
 689                         uci_perror(ctx, NULL);
 690                 if ((ctx->err != UCI_ERR_PARSE) ||
 691                         (ctx->flags & UCI_FLAG_STRICT))
 692                         UCI_THROW(ctx, ctx->err);
 693         }
 694
 695         uci_fixup_section(ctx, ctx->pctx->section);
 696         if (!pctx->package && name)
 697                 uci_switch_config(ctx);
 698         if (package)
 699                 *package = pctx->package;
 700         if (pctx->merge)
 701                 pctx->package = NULL;
 702
 703         pctx->name = NULL;
 704         uci_switch_config(ctx);
 705
 706         /* no error happened, we can get rid of the parser context now */
 707         uci_cleanup(ctx);
 708
 709         return 0;
 710 }
 711
 712
 713 static char *uci_config_path(struct uci_context *ctx, const char *name)
 714 {
 715         char *filename;
 716
 717         UCI_ASSERT(ctx, uci_validate_package(name));
 718         filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
 719         sprintf(filename, "%s/%s", ctx->confdir, name);
 720
 721         return filename;
 722 }
 723
 724 static void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 725 {
 726         struct uci_package *p = *package;
 727         FILE *f1, *f2 = NULL;
 728         char *name = NULL;
 729         char *path = NULL;
 730         char *filename = NULL;
 731         struct stat statbuf;
 732         bool do_rename = false;
 733
 734         if (!p->path) {
 735                 if (overwrite)
 736                         p->path = uci_config_path(ctx, p->e.name);
 737                 else
 738                         UCI_THROW(ctx, UCI_ERR_INVAL);
 739         }
 740
 741         if ((asprintf(&filename, "%s/.%s.uci-XXXXXX", ctx->confdir, p->e.name) < 0) || !filename)
 742                 UCI_THROW(ctx, UCI_ERR_MEM);
 743
 744         if (!mktemp(filename))
 745                 *filename = 0;
 746
 747         if (!*filename) {
 748                 free(filename);
 749                 UCI_THROW(ctx, UCI_ERR_IO);
 750         }
 751
 752         if ((stat(filename, &statbuf) == 0) && ((statbuf.st_mode & S_IFMT) != S_IFREG))
 753                 UCI_THROW(ctx, UCI_ERR_IO);
 754
 755         /* open the config file for writing now, so that it is locked */
 756         f1 = uci_open_stream(ctx, p->path, NULL, SEEK_SET, true, true);
 757
 758         /* flush unsaved changes and reload from delta file */
 759         UCI_TRAP_SAVE(ctx, done);
 760         if (p->has_delta) {
 761                 if (!overwrite) {
 762                         name = uci_strdup(ctx, p->e.name);
 763                         path = uci_strdup(ctx, p->path);
 764                         /* dump our own changes to the delta file */
 765                         if (!uci_list_empty(&p->delta))
 766                                 UCI_INTERNAL(uci_save, ctx, p);
 767
 768                         /*
 769                          * other processes might have modified the config
 770                          * as well. dump and reload
 771                          */
 772                         uci_free_package(&p);
 773                         uci_cleanup(ctx);
 774                         UCI_INTERNAL(uci_import, ctx, f1, name, &p, true);
 775
 776                         p->path = path;
 777                         p->has_delta = true;
 778                         *package = p;
 779
 780                         /* freed together with the uci_package */
 781                         path = NULL;
 782                 }
 783
 784                 /* flush delta */
 785                 if (!uci_load_delta(ctx, p, true))
 786                         goto done;
 787         }
 788
 789         f2 = uci_open_stream(ctx, filename, p->path, SEEK_SET, true, true);
 790         uci_export(ctx, f2, p, false);
 791
 792         fflush(f2);
 793         fsync(fileno(f2));
 794         uci_close_stream(f2);
 795
 796         do_rename = true;
 797
 798         UCI_TRAP_RESTORE(ctx);
 799
 800 done:
 801         free(name);
 802         free(path);
 803         uci_close_stream(f1);
 804         if (do_rename && rename(filename, p->path)) {
 805                 unlink(filename);
 806                 UCI_THROW(ctx, UCI_ERR_IO);
 807         }
 808         free(filename);
 809         sync();
 810         if (ctx->err)
 811                 UCI_THROW(ctx, ctx->err);
 812 }
 813
 814
 815 /*
 816  * This function returns the filename by returning the string
 817  * after the last '/' character. By checking for a non-'\0'
 818  * character afterwards, directories are ignored (glob marks
 819  * those with a trailing '/'
 820  */
 821 static inline char *get_filename(char *path)
 822 {
 823         char *p;
 824
 825         p = strrchr(path, '/');
 826         p++;
 827         if (!*p)
 828                 return NULL;
 829         return p;
 830 }
 831
 832 static char **uci_list_config_files(struct uci_context *ctx)
 833 {
 834         char **configs;
 835         glob_t globbuf;
 836         int size, i;
 837         char *buf;
 838         char *dir;
 839
 840         dir = uci_malloc(ctx, strlen(ctx->confdir) + 1 + sizeof("/*"));
 841         sprintf(dir, "%s/*", ctx->confdir);
 842         if (glob(dir, GLOB_MARK, NULL, &globbuf) != 0) {
 843                 free(dir);
 844                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 845         }
 846
 847         size = sizeof(char *) * (globbuf.gl_pathc + 1);
 848         for(i = 0; i < globbuf.gl_pathc; i++) {
 849                 char *p;
 850
 851                 p = get_filename(globbuf.gl_pathv[i]);
 852                 if (!p)
 853                         continue;
 854
 855                 size += strlen(p) + 1;
 856         }
 857
 858         configs = uci_malloc(ctx, size);
 859         buf = (char *) &configs[globbuf.gl_pathc + 1];
 860         for(i = 0; i < globbuf.gl_pathc; i++) {
 861                 char *p;
 862
 863                 p = get_filename(globbuf.gl_pathv[i]);
 864                 if (!p)
 865                         continue;
 866
 867                 if (!uci_validate_package(p))
 868                         continue;
 869
 870                 configs[i] = buf;
 871                 strcpy(buf, p);
 872                 buf += strlen(buf) + 1;
 873         }
 874         free(dir);
 875         globfree(&globbuf);
 876         return configs;
 877 }
 878
 879 static struct uci_package *uci_file_load(struct uci_context *ctx, const char *name)
 880 {
 881         struct uci_package *package = NULL;
 882         char *filename;
 883         bool confdir;
 884         FILE *file = NULL;
 885
 886         switch (name[0]) {
 887         case '.':
 888                 /* relative path outside of /etc/config */
 889                 if (name[1] != '/')
 890                         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 891                 /* fall through */
 892         case '/':
 893                 /* absolute path outside of /etc/config */
 894                 filename = uci_strdup(ctx, name);
 895                 name = strrchr(name, '/') + 1;
 896                 confdir = false;
 897                 break;
 898         default:
 899                 /* config in /etc/config */
 900                 filename = uci_config_path(ctx, name);
 901                 confdir = true;
 902                 break;
 903         }
 904
 905         UCI_TRAP_SAVE(ctx, done);
 906         file = uci_open_stream(ctx, filename, NULL, SEEK_SET, false, false);
 907         ctx->err = 0;
 908         UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
 909         UCI_TRAP_RESTORE(ctx);
 910
 911         if (package) {
 912                 package->path = filename;
 913                 package->has_delta = confdir;
 914                 uci_load_delta(ctx, package, false);
 915         }
 916
 917 done:
 918         uci_close_stream(file);
 919         if (ctx->err) {
 920                 free(filename);
 921                 UCI_THROW(ctx, ctx->err);
 922         }
 923         return package;
 924 }
 925
 926 __private UCI_BACKEND(uci_file_backend, "file",
 927         .load = uci_file_load,
 928         .commit = uci_file_commit,
 929         .list_configs = uci_list_config_files,
 930 );