2 * libuci - Library for the Unified Configuration Interface
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
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
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
16 * This file contains the code for parsing uci config files
19 #include <sys/types.h>
27 #define LINEBUF_MAX 4096
30 * Fetch a new line from the input stream and resize buffer if necessary
32 static void uci_getln(struct uci_context *ctx, int offset)
34 struct uci_parse_context *pctx = ctx->pctx;
38 if (pctx->buf == NULL) {
39 pctx->buf = uci_malloc(ctx, LINEBUF);
40 pctx->bufsz = LINEBUF;
48 p = fgets(p, pctx->bufsz - ofs, pctx->file);
53 if (pctx->buf[ofs - 1] == '\n') {
55 pctx->buf[ofs - 1] = 0;
59 if (pctx->bufsz > LINEBUF_MAX/2) {
60 pctx->reason = "line too long";
61 pctx->byte = LINEBUF_MAX;
62 UCI_THROW(ctx, UCI_ERR_PARSE);
66 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
71 * Clean up all extra memory used by the parser and exporter
73 static void uci_file_cleanup(struct uci_context *ctx)
75 struct uci_parse_context *pctx;
89 uci_free_package(pctx->package);
100 * parse a character escaped by '\'
101 * returns true if the escaped character is to be parsed
102 * returns false if the escaped character is to be ignored
104 static inline bool parse_backslash(struct uci_context *ctx, char **str)
109 /* undecoded backslash at the end of line, fetch the next line */
112 uci_getln(ctx, *str - ctx->pctx->buf);
116 /* FIXME: decode escaped char, necessary? */
121 * move the string pointer forward until a non-whitespace character or
124 static void skip_whitespace(struct uci_context *ctx, char **str)
127 while (**str && isspace(**str))
131 if (!parse_backslash(ctx, str))
136 static inline void addc(char **dest, char **src)
144 * parse a double quoted string argument from the command line
146 static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
150 /* skip quote character */
153 while ((c = **str)) {
160 if (!parse_backslash(ctx, str))
168 ctx->pctx->reason = "unterminated \"";
169 ctx->pctx->byte = *str - ctx->pctx->buf;
170 UCI_THROW(ctx, UCI_ERR_PARSE);
174 * parse a single quoted string argument from the command line
176 static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
179 /* skip quote character */
182 while ((c = **str)) {
192 ctx->pctx->reason = "unterminated '";
193 ctx->pctx->byte = *str - ctx->pctx->buf;
194 UCI_THROW(ctx, UCI_ERR_PARSE);
198 * parse a string from the command line and detect the quoting style
200 static void parse_str(struct uci_context *ctx, char **str, char **target)
205 parse_single_quote(ctx, str, target);
208 parse_double_quote(ctx, str, target);
213 if (!parse_backslash(ctx, str))
220 } while (**str && !isspace(**str));
224 * if the string was unquoted and we've stopped at a whitespace
225 * character, skip to the next one, because the whitespace will
226 * be overwritten by a null byte here
231 /* terminate the parsed string */
236 * extract the next argument from the command line
238 static char *next_arg(struct uci_context *ctx, char **str, bool required)
244 skip_whitespace(ctx, str);
245 parse_str(ctx, str, &ptr);
246 if (required && !*val) {
247 ctx->pctx->reason = "insufficient arguments";
248 ctx->pctx->byte = *str - ctx->pctx->buf;
249 UCI_THROW(ctx, UCI_ERR_PARSE);
256 * verify that the end of the line or command is reached.
257 * throw an error if extra arguments are given on the command line
259 static void assert_eol(struct uci_context *ctx, char **str)
263 tmp = next_arg(ctx, str, false);
265 ctx->pctx->reason = "too many arguments";
266 ctx->pctx->byte = tmp - ctx->pctx->buf;
267 UCI_THROW(ctx, UCI_ERR_PARSE);
272 * switch to a different config, either triggered by uci_load, or by a
273 * 'package <...>' statement in the import file
275 static void uci_switch_config(struct uci_context *ctx)
277 struct uci_parse_context *pctx;
283 /* add the last config to main config file list */
285 uci_list_add(&ctx->root, &pctx->package->e.list);
287 pctx->package = NULL;
288 pctx->section = NULL;
295 * if an older config under the same name exists, unload it
296 * ignore errors here, e.g. if the config was not found
298 UCI_TRAP_SAVE(ctx, ignore);
299 uci_unload(ctx, name);
300 UCI_TRAP_RESTORE(ctx);
304 pctx->package = uci_alloc_package(ctx, name);
308 * parse the 'package' uci command (next config package)
310 static void uci_parse_package(struct uci_context *ctx, char **str)
314 /* command string null-terminated by strtok */
315 *str += strlen(*str) + 1;
317 name = next_arg(ctx, str, true);
318 assert_eol(ctx, str);
319 ctx->pctx->name = name;
320 uci_switch_config(ctx);
324 * parse the 'config' uci command (open a section)
326 static void uci_parse_config(struct uci_context *ctx, char **str)
331 if (!ctx->pctx->package) {
332 if (!ctx->pctx->name) {
333 ctx->pctx->byte = *str - ctx->pctx->buf;
334 ctx->pctx->reason = "attempting to import a file without a package name";
335 UCI_THROW(ctx, UCI_ERR_PARSE);
337 uci_switch_config(ctx);
340 /* command string null-terminated by strtok */
341 *str += strlen(*str) + 1;
343 type = next_arg(ctx, str, true);
344 name = next_arg(ctx, str, false);
345 assert_eol(ctx, str);
346 ctx->pctx->section = uci_alloc_section(ctx->pctx->package, type, name);
350 * parse the 'option' uci command (open a value)
352 static void uci_parse_option(struct uci_context *ctx, char **str)
357 if (!ctx->pctx->section) {
358 ctx->pctx->byte = *str - ctx->pctx->buf;
359 ctx->pctx->reason = "option command found before the first section";
360 UCI_THROW(ctx, UCI_ERR_PARSE);
362 /* command string null-terminated by strtok */
363 *str += strlen(*str) + 1;
365 name = next_arg(ctx, str, true);
366 value = next_arg(ctx, str, true);
367 assert_eol(ctx, str);
368 uci_alloc_option(ctx->pctx->section, name, value);
373 * parse a complete input line, split up combined commands by ';'
375 static void uci_parse_line(struct uci_context *ctx)
377 struct uci_parse_context *pctx = ctx->pctx;
378 char *word, *brk = NULL;
380 for (word = strtok_r(pctx->buf, ";", &brk);
382 word = strtok_r(NULL, ";", &brk)) {
385 word = strtok_r(word, " \t", &pbrk);
389 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
390 uci_parse_package(ctx, &word);
393 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
394 uci_parse_config(ctx, &word);
397 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
398 uci_parse_option(ctx, &word);
401 pctx->reason = "unterminated command";
402 pctx->byte = word - pctx->buf;
403 UCI_THROW(ctx, UCI_ERR_PARSE);
409 /* max number of characters that escaping adds to the string */
410 #define UCI_QUOTE_ESCAPE "'\\'"
413 * escape an uci string for export
415 static char *uci_escape(struct uci_context *ctx, char *str)
421 ctx->bufsz = LINEBUF;
422 ctx->buf = malloc(LINEBUF);
426 p = strchr(str, '\'');
433 if (p + sizeof(UCI_QUOTE_ESCAPE) - str >= ctx->bufsz) {
435 ctx->buf = realloc(ctx->buf, ctx->bufsz);
437 UCI_THROW(ctx, UCI_ERR_MEM);
439 memcpy(&ctx->buf[pos], s, len);
442 strcpy(&ctx->buf[pos], UCI_QUOTE_ESCAPE);
443 pos += sizeof(UCI_QUOTE_ESCAPE);
445 } while ((p = strchr(s, '\'')));
452 * export a single config package to a file stream
454 static void uci_export_package(struct uci_package *p, FILE *stream)
456 struct uci_context *ctx = p->ctx;
457 struct uci_element *s, *o;
459 fprintf(stream, "package '%s'\n", uci_escape(ctx, p->e.name));
460 uci_foreach_element(&p->sections, s) {
461 struct uci_section *sec = uci_to_section(s);
462 fprintf(stream, "\nconfig '%s'", uci_escape(ctx, sec->type));
463 fprintf(stream, " '%s'\n", uci_escape(ctx, sec->e.name));
464 uci_foreach_element(&sec->options, o) {
465 struct uci_option *opt = uci_to_option(o);
466 fprintf(stream, "\toption '%s'", uci_escape(ctx, opt->e.name));
467 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->value));
470 fprintf(stream, "\n");
473 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package)
475 struct uci_element *e;
478 UCI_ASSERT(ctx, stream != NULL);
481 uci_export_package(package, stream);
485 uci_foreach_element(&ctx->root, e) {
486 uci_export_package(uci_to_package(e), stream);
492 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package)
494 struct uci_parse_context *pctx;
496 /* make sure no memory from previous parse attempts is leaked */
497 uci_file_cleanup(ctx);
499 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
504 * If 'name' was supplied, assume that the supplied stream does not contain
505 * the appropriate 'package <name>' string to specify the config name
506 * NB: the config file can still override the package name
511 while (!feof(pctx->file)) {
518 *package = pctx->package;
521 uci_switch_config(ctx);
523 /* no error happened, we can get rid of the parser context now */
524 uci_file_cleanup(ctx);
529 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
538 UCI_ASSERT(ctx, name != NULL);
543 /* absolute/relative path outside of /etc/config */
544 filename = (char *) name;
548 filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
549 sprintf(filename, UCI_CONFDIR "/%s", name);
554 if ((stat(filename, &statbuf) < 0) ||
555 ((statbuf.st_mode & S_IFMT) != S_IFREG)) {
556 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
559 fd = open(filename, O_RDONLY);
560 if (filename != name)
564 file = fdopen(fd, "r");
566 UCI_THROW(ctx, UCI_ERR_IO);
569 UCI_TRAP_SAVE(ctx, done);
570 uci_import(ctx, file, name, package);
571 UCI_TRAP_RESTORE(ctx);
580 * This function returns the filename by returning the string
581 * after the last '/' character. By checking for a non-'\0'
582 * character afterwards, directories are ignored (glob marks
583 * those with a trailing '/'
585 static inline char *get_filename(char *path)
589 p = strrchr(path, '/');
596 char **uci_list_configs(struct uci_context *ctx)
603 if (glob(UCI_CONFDIR "/*", GLOB_MARK, NULL, &globbuf) != 0)
606 size = sizeof(char *) * (globbuf.gl_pathc + 1);
607 for(i = 0; i < globbuf.gl_pathc; i++) {
610 p = get_filename(globbuf.gl_pathv[i]);
614 size += strlen(p) + 1;
617 configs = malloc(size);
621 memset(configs, 0, size);
622 buf = (char *) &configs[globbuf.gl_pathc + 1];
623 for(i = 0; i < globbuf.gl_pathc; i++) {
626 p = get_filename(globbuf.gl_pathv[i]);
632 buf += strlen(buf) + 1;