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, bool package)
 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_str(pctx_str(pctx, val), name, package))
 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         if (!*str)
 282                 uci_getln(ctx, 0);
 283
 284         /*FIXME do we need to skip empty lines? */
 285         ofs_result = next_arg(ctx, false, false, false);
 286         *result = pctx_str(ctx->pctx, ofs_result);
 287         *str = pctx_cur_str(ctx->pctx);
 288
 289         return 0;
 290 }
 291
 292 static int
 293 uci_fill_ptr(struct uci_context *ctx, struct uci_ptr *ptr, struct uci_element *e)
 294 {
 295         UCI_ASSERT(ctx, ptr != NULL);
 296         UCI_ASSERT(ctx, e != NULL);
 297
 298         memset(ptr, 0, sizeof(struct uci_ptr));
 299         switch(e->type) {
 300         case UCI_TYPE_OPTION:
 301                 ptr->o = uci_to_option(e);
 302                 goto fill_option;
 303         case UCI_TYPE_SECTION:
 304                 ptr->s = uci_to_section(e);
 305                 goto fill_section;
 306         case UCI_TYPE_PACKAGE:
 307                 ptr->p = uci_to_package(e);
 308                 goto fill_package;
 309         default:
 310                 UCI_THROW(ctx, UCI_ERR_INVAL);
 311         }
 312
 313 fill_option:
 314         ptr->option = ptr->o->e.name;
 315         ptr->s = ptr->o->section;
 316 fill_section:
 317         ptr->section = ptr->s->e.name;
 318         ptr->p = ptr->s->package;
 319 fill_package:
 320         ptr->package = ptr->p->e.name;
 321
 322         ptr->flags |= UCI_LOOKUP_DONE;
 323
 324         return 0;
 325 }
 326
 327
 328
 329 /*
 330  * verify that the end of the line or command is reached.
 331  * throw an error if extra arguments are given on the command line
 332  */
 333 static void assert_eol(struct uci_context *ctx)
 334 {
 335         char *tmp;
 336         int ofs_tmp;
 337
 338         skip_whitespace(ctx);
 339         ofs_tmp = next_arg(ctx, false, false, false);
 340         tmp = pctx_str(ctx->pctx, ofs_tmp);
 341         if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
 342                 uci_parse_error(ctx, "too many arguments");
 343 }
 344
 345 /*
 346  * switch to a different config, either triggered by uci_load, or by a
 347  * 'package <...>' statement in the import file
 348  */
 349 static void uci_switch_config(struct uci_context *ctx)
 350 {
 351         struct uci_parse_context *pctx;
 352         struct uci_element *e;
 353         const char *name;
 354
 355         pctx = ctx->pctx;
 356         name = pctx->name;
 357
 358         /* add the last config to main config file list */
 359         if (pctx->package) {
 360                 pctx->package->backend = ctx->backend;
 361                 uci_list_add(&ctx->root, &pctx->package->e.list);
 362
 363                 pctx->package = NULL;
 364                 pctx->section = NULL;
 365         }
 366
 367         if (!name)
 368                 return;
 369
 370         /*
 371          * if an older config under the same name exists, unload it
 372          * ignore errors here, e.g. if the config was not found
 373          */
 374         e = uci_lookup_list(&ctx->root, name);
 375         if (e)
 376                 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
 377         pctx->package = uci_alloc_package(ctx, name);
 378 }
 379
 380 /*
 381  * parse the 'package' uci command (next config package)
 382  */
 383 static void uci_parse_package(struct uci_context *ctx, bool single)
 384 {
 385         struct uci_parse_context *pctx = ctx->pctx;
 386         int ofs_name;
 387         char *name;
 388
 389         /* command string null-terminated by strtok */
 390         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 391
 392         ofs_name = next_arg(ctx, true, true, true);
 393         name = pctx_str(pctx, ofs_name);
 394         assert_eol(ctx);
 395         if (single)
 396                 return;
 397
 398         ctx->pctx->name = name;
 399         uci_switch_config(ctx);
 400 }
 401
 402 /*
 403  * parse the 'config' uci command (open a section)
 404  */
 405 static void uci_parse_config(struct uci_context *ctx)
 406 {
 407         struct uci_parse_context *pctx = ctx->pctx;
 408         struct uci_element *e;
 409         struct uci_ptr ptr;
 410         int ofs_name, ofs_type;
 411         char *name;
 412         char *type;
 413
 414         uci_fixup_section(ctx, ctx->pctx->section);
 415         if (!ctx->pctx->package) {
 416                 if (!ctx->pctx->name)
 417                         uci_parse_error(ctx, "attempting to import a file without a package name");
 418
 419                 uci_switch_config(ctx);
 420         }
 421
 422         /* command string null-terminated by strtok */
 423         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 424
 425         ofs_type = next_arg(ctx, true, false, false);
 426         type = pctx_str(pctx, ofs_type);
 427         if (!uci_validate_type(type))
 428                 uci_parse_error(ctx, "invalid character in type field");
 429
 430         ofs_name = next_arg(ctx, false, true, false);
 431         type = pctx_str(pctx, ofs_type);
 432         name = pctx_str(pctx, ofs_name);
 433         assert_eol(ctx);
 434
 435         if (!name || !name[0]) {
 436                 ctx->internal = !pctx->merge;
 437                 UCI_NESTED(uci_add_section, ctx, pctx->package, type, &pctx->section);
 438         } else {
 439                 uci_fill_ptr(ctx, &ptr, &pctx->package->e);
 440                 e = uci_lookup_list(&pctx->package->sections, name);
 441                 if (e)
 442                         ptr.s = uci_to_section(e);
 443                 ptr.section = name;
 444                 ptr.value = type;
 445
 446                 ctx->internal = !pctx->merge;
 447                 UCI_NESTED(uci_set, ctx, &ptr);
 448                 pctx->section = uci_to_section(ptr.last);
 449         }
 450 }
 451
 452 /*
 453  * parse the 'option' uci command (open a value)
 454  */
 455 static void uci_parse_option(struct uci_context *ctx, bool list)
 456 {
 457         struct uci_parse_context *pctx = ctx->pctx;
 458         struct uci_element *e;
 459         struct uci_ptr ptr;
 460         int ofs_name, ofs_value;
 461         char *name = NULL;
 462         char *value = NULL;
 463
 464         if (!pctx->section)
 465                 uci_parse_error(ctx, "option/list command found before the first section");
 466
 467         /* command string null-terminated by strtok */
 468         pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
 469
 470         ofs_name = next_arg(ctx, true, true, false);
 471         ofs_value = next_arg(ctx, false, false, false);
 472         name = pctx_str(pctx, ofs_name);
 473         value = pctx_str(pctx, ofs_value);
 474         assert_eol(ctx);
 475
 476         uci_fill_ptr(ctx, &ptr, &pctx->section->e);
 477         e = uci_lookup_list(&pctx->section->options, name);
 478         if (e)
 479                 ptr.o = uci_to_option(e);
 480         ptr.option = name;
 481         ptr.value = value;
 482
 483         ctx->internal = !pctx->merge;
 484         if (list)
 485                 UCI_NESTED(uci_add_list, ctx, &ptr);
 486         else
 487                 UCI_NESTED(uci_set, ctx, &ptr);
 488 }
 489
 490 /*
 491  * parse a complete input line, split up combined commands by ';'
 492  */
 493 static void uci_parse_line(struct uci_context *ctx, bool single)
 494 {
 495         struct uci_parse_context *pctx = ctx->pctx;
 496         char *word;
 497
 498         /* Skip whitespace characters at the start of line */
 499         skip_whitespace(ctx);
 500         do {
 501                 word = strtok(pctx_cur_str(pctx), " \t");
 502                 if (!word)
 503                         return;
 504
 505                 switch(word[0]) {
 506                         case 0:
 507                         case '#':
 508                                 return;
 509                         case 'p':
 510                                 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
 511                                         uci_parse_package(ctx, single);
 512                                 else
 513                                         goto invalid;
 514                                 break;
 515                         case 'c':
 516                                 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
 517                                         uci_parse_config(ctx);
 518                                 else
 519                                         goto invalid;
 520                                 break;
 521                         case 'o':
 522                                 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
 523                                         uci_parse_option(ctx, false);
 524                                 else
 525                                         goto invalid;
 526                                 break;
 527                         case 'l':
 528                                 if ((word[1] == 0) || !strcmp(word + 1, "ist"))
 529                                         uci_parse_option(ctx, true);
 530                                 else
 531                                         goto invalid;
 532                                 break;
 533                         default:
 534                                 goto invalid;
 535                 }
 536                 continue;
 537 invalid:
 538                 uci_parse_error(ctx, "invalid command");
 539         } while (1);
 540 }
 541
 542 /* max number of characters that escaping adds to the string */
 543 #define UCI_QUOTE_ESCAPE        "'\\''"
 544
 545 /*
 546  * escape an uci string for export
 547  */
 548 static const char *uci_escape(struct uci_context *ctx, const char *str)
 549 {
 550         const char *end;
 551         int ofs = 0;
 552
 553         if (!ctx->buf) {
 554                 ctx->bufsz = LINEBUF;
 555                 ctx->buf = malloc(LINEBUF);
 556
 557                 if (!ctx->buf)
 558                         return str;
 559         }
 560
 561         while (1) {
 562                 int len;
 563
 564                 end = strchr(str, '\'');
 565                 if (!end)
 566                         end = str + strlen(str);
 567                 len = end - str;
 568
 569                 /* make sure that we have enough room in the buffer */
 570                 while (ofs + len + sizeof(UCI_QUOTE_ESCAPE) + 1 > ctx->bufsz) {
 571                         ctx->bufsz *= 2;
 572                         ctx->buf = uci_realloc(ctx, ctx->buf, ctx->bufsz);
 573                 }
 574
 575                 /* copy the string until the character before the quote */
 576                 memcpy(&ctx->buf[ofs], str, len);
 577                 ofs += len;
 578
 579                 /* end of string? return the buffer */
 580                 if (*end == 0)
 581                         break;
 582
 583                 memcpy(&ctx->buf[ofs], UCI_QUOTE_ESCAPE, sizeof(UCI_QUOTE_ESCAPE));
 584                 ofs += strlen(&ctx->buf[ofs]);
 585                 str = end + 1;
 586         }
 587
 588         ctx->buf[ofs] = 0;
 589         return ctx->buf;
 590 }
 591
 592 /*
 593  * export a single config package to a file stream
 594  */
 595 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
 596 {
 597         struct uci_context *ctx = p->ctx;
 598         struct uci_element *s, *o, *i;
 599
 600         if (header)
 601                 fprintf(stream, "package %s\n", uci_escape(ctx, p->e.name));
 602         uci_foreach_element(&p->sections, s) {
 603                 struct uci_section *sec = uci_to_section(s);
 604                 fprintf(stream, "\nconfig %s", uci_escape(ctx, sec->type));
 605                 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
 606                         fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
 607                 fprintf(stream, "\n");
 608                 uci_foreach_element(&sec->options, o) {
 609                         struct uci_option *opt = uci_to_option(o);
 610                         switch(opt->type) {
 611                         case UCI_TYPE_STRING:
 612                                 fprintf(stream, "\toption %s", uci_escape(ctx, opt->e.name));
 613                                 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->v.string));
 614                                 break;
 615                         case UCI_TYPE_LIST:
 616                                 uci_foreach_element(&opt->v.list, i) {
 617                                         fprintf(stream, "\tlist %s", uci_escape(ctx, opt->e.name));
 618                                         fprintf(stream, " '%s'\n", uci_escape(ctx, i->name));
 619                                 }
 620                                 break;
 621                         default:
 622                                 fprintf(stream, "\t# unknown type for option '%s'\n", uci_escape(ctx, opt->e.name));
 623                                 break;
 624                         }
 625                 }
 626         }
 627         fprintf(stream, "\n");
 628 }
 629
 630 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
 631 {
 632         struct uci_element *e;
 633
 634         UCI_HANDLE_ERR(ctx);
 635         UCI_ASSERT(ctx, stream != NULL);
 636
 637         if (package)
 638                 uci_export_package(package, stream, header);
 639         else {
 640                 uci_foreach_element(&ctx->root, e) {
 641                         uci_export_package(uci_to_package(e), stream, header);
 642                 }
 643         }
 644
 645         return 0;
 646 }
 647
 648 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
 649 {
 650         struct uci_parse_context *pctx;
 651         UCI_HANDLE_ERR(ctx);
 652
 653         /* make sure no memory from previous parse attempts is leaked */
 654         uci_cleanup(ctx);
 655
 656         uci_alloc_parse_context(ctx);
 657         pctx = ctx->pctx;
 658         pctx->file = stream;
 659         if (package && *package && single) {
 660                 pctx->package = *package;
 661                 pctx->merge = true;
 662         }
 663
 664         /*
 665          * If 'name' was supplied, assume that the supplied stream does not contain
 666          * the appropriate 'package <name>' string to specify the config name
 667          * NB: the config file can still override the package name
 668          */
 669         if (name) {
 670                 UCI_ASSERT(ctx, uci_validate_package(name));
 671                 pctx->name = name;
 672         }
 673
 674         while (!feof(pctx->file)) {
 675                 pctx->pos = 0;
 676                 uci_getln(ctx, 0);
 677                 UCI_TRAP_SAVE(ctx, error);
 678                 if (pctx->buf[0])
 679                         uci_parse_line(ctx, single);
 680                 UCI_TRAP_RESTORE(ctx);
 681                 continue;
 682 error:
 683                 if (ctx->flags & UCI_FLAG_PERROR)
 684                         uci_perror(ctx, NULL);
 685                 if ((ctx->err != UCI_ERR_PARSE) ||
 686                         (ctx->flags & UCI_FLAG_STRICT))
 687                         UCI_THROW(ctx, ctx->err);
 688         }
 689
 690         uci_fixup_section(ctx, ctx->pctx->section);
 691         if (!pctx->package && name)
 692                 uci_switch_config(ctx);
 693         if (package)
 694                 *package = pctx->package;
 695         if (pctx->merge)
 696                 pctx->package = NULL;
 697
 698         pctx->name = NULL;
 699         uci_switch_config(ctx);
 700
 701         /* no error happened, we can get rid of the parser context now */
 702         uci_cleanup(ctx);
 703
 704         return 0;
 705 }
 706
 707
 708 static char *uci_config_path(struct uci_context *ctx, const char *name)
 709 {
 710         char *filename;
 711
 712         UCI_ASSERT(ctx, uci_validate_package(name));
 713         filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
 714         sprintf(filename, "%s/%s", ctx->confdir, name);
 715
 716         return filename;
 717 }
 718
 719 static void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
 720 {
 721         struct uci_package *p = *package;
 722         FILE *f1, *f2 = NULL;
 723         char *name = NULL;
 724         char *path = NULL;
 725         char *filename = NULL;
 726         struct stat statbuf;
 727         bool do_rename = false;
 728
 729         if (!p->path) {
 730                 if (overwrite)
 731                         p->path = uci_config_path(ctx, p->e.name);
 732                 else
 733                         UCI_THROW(ctx, UCI_ERR_INVAL);
 734         }
 735
 736         if ((asprintf(&filename, "%s/.%s.uci-XXXXXX", ctx->confdir, p->e.name) < 0) || !filename)
 737                 UCI_THROW(ctx, UCI_ERR_MEM);
 738
 739         if (!mktemp(filename))
 740                 *filename = 0;
 741
 742         if (!*filename) {
 743                 free(filename);
 744                 UCI_THROW(ctx, UCI_ERR_IO);
 745         }
 746
 747         if ((stat(filename, &statbuf) == 0) && ((statbuf.st_mode & S_IFMT) != S_IFREG))
 748                 UCI_THROW(ctx, UCI_ERR_IO);
 749
 750         /* open the config file for writing now, so that it is locked */
 751         f1 = uci_open_stream(ctx, p->path, NULL, SEEK_SET, true, true);
 752
 753         /* flush unsaved changes and reload from delta file */
 754         UCI_TRAP_SAVE(ctx, done);
 755         if (p->has_delta) {
 756                 if (!overwrite) {
 757                         name = uci_strdup(ctx, p->e.name);
 758                         path = uci_strdup(ctx, p->path);
 759                         /* dump our own changes to the delta file */
 760                         if (!uci_list_empty(&p->delta))
 761                                 UCI_INTERNAL(uci_save, ctx, p);
 762
 763                         /*
 764                          * other processes might have modified the config
 765                          * as well. dump and reload
 766                          */
 767                         uci_free_package(&p);
 768                         uci_cleanup(ctx);
 769                         UCI_INTERNAL(uci_import, ctx, f1, name, &p, true);
 770
 771                         p->path = path;
 772                         p->has_delta = true;
 773                         *package = p;
 774
 775                         /* freed together with the uci_package */
 776                         path = NULL;
 777                 }
 778
 779                 /* flush delta */
 780                 if (!uci_load_delta(ctx, p, true))
 781                         goto done;
 782         }
 783
 784         f2 = uci_open_stream(ctx, filename, p->path, SEEK_SET, true, true);
 785         uci_export(ctx, f2, p, false);
 786
 787         fflush(f2);
 788         fsync(fileno(f2));
 789         uci_close_stream(f2);
 790
 791         do_rename = true;
 792
 793         UCI_TRAP_RESTORE(ctx);
 794
 795 done:
 796         free(name);
 797         free(path);
 798         uci_close_stream(f1);
 799         if (do_rename && rename(filename, p->path)) {
 800                 unlink(filename);
 801                 UCI_THROW(ctx, UCI_ERR_IO);
 802         }
 803         free(filename);
 804         sync();
 805         if (ctx->err)
 806                 UCI_THROW(ctx, ctx->err);
 807 }
 808
 809
 810 /*
 811  * This function returns the filename by returning the string
 812  * after the last '/' character. By checking for a non-'\0'
 813  * character afterwards, directories are ignored (glob marks
 814  * those with a trailing '/'
 815  */
 816 static inline char *get_filename(char *path)
 817 {
 818         char *p;
 819
 820         p = strrchr(path, '/');
 821         p++;
 822         if (!*p)
 823                 return NULL;
 824         return p;
 825 }
 826
 827 static char **uci_list_config_files(struct uci_context *ctx)
 828 {
 829         char **configs;
 830         glob_t globbuf;
 831         int size, i;
 832         char *buf;
 833         char *dir;
 834
 835         dir = uci_malloc(ctx, strlen(ctx->confdir) + 1 + sizeof("/*"));
 836         sprintf(dir, "%s/*", ctx->confdir);
 837         if (glob(dir, GLOB_MARK, NULL, &globbuf) != 0) {
 838                 free(dir);
 839                 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 840         }
 841
 842         size = sizeof(char *) * (globbuf.gl_pathc + 1);
 843         for(i = 0; i < globbuf.gl_pathc; i++) {
 844                 char *p;
 845
 846                 p = get_filename(globbuf.gl_pathv[i]);
 847                 if (!p)
 848                         continue;
 849
 850                 size += strlen(p) + 1;
 851         }
 852
 853         configs = uci_malloc(ctx, size);
 854         buf = (char *) &configs[globbuf.gl_pathc + 1];
 855         for(i = 0; i < globbuf.gl_pathc; i++) {
 856                 char *p;
 857
 858                 p = get_filename(globbuf.gl_pathv[i]);
 859                 if (!p)
 860                         continue;
 861
 862                 if (!uci_validate_package(p))
 863                         continue;
 864
 865                 configs[i] = buf;
 866                 strcpy(buf, p);
 867                 buf += strlen(buf) + 1;
 868         }
 869         free(dir);
 870         globfree(&globbuf);
 871         return configs;
 872 }
 873
 874 static struct uci_package *uci_file_load(struct uci_context *ctx, const char *name)
 875 {
 876         struct uci_package *package = NULL;
 877         char *filename;
 878         bool confdir;
 879         FILE *file = NULL;
 880
 881         switch (name[0]) {
 882         case '.':
 883                 /* relative path outside of /etc/config */
 884                 if (name[1] != '/')
 885                         UCI_THROW(ctx, UCI_ERR_NOTFOUND);
 886                 /* fall through */
 887         case '/':
 888                 /* absolute path outside of /etc/config */
 889                 filename = uci_strdup(ctx, name);
 890                 name = strrchr(name, '/') + 1;
 891                 confdir = false;
 892                 break;
 893         default:
 894                 /* config in /etc/config */
 895                 filename = uci_config_path(ctx, name);
 896                 confdir = true;
 897                 break;
 898         }
 899
 900         UCI_TRAP_SAVE(ctx, done);
 901         file = uci_open_stream(ctx, filename, NULL, SEEK_SET, false, false);
 902         ctx->err = 0;
 903         UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
 904         UCI_TRAP_RESTORE(ctx);
 905
 906         if (package) {
 907                 package->path = filename;
 908                 package->has_delta = confdir;
 909                 uci_load_delta(ctx, package, false);
 910         }
 911
 912 done:
 913         uci_close_stream(file);
 914         if (ctx->err) {
 915                 free(filename);
 916                 UCI_THROW(ctx, ctx->err);
 917         }
 918         return package;
 919 }
 920
 921 __private UCI_BACKEND(uci_file_backend, "file",
 922         .load = uci_file_load,
 923         .commit = uci_file_commit,
 924         .list_configs = uci_list_config_files,
 925 );