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 Lesser General Public License for more details.
16 * This file contains the code for parsing uci config files
20 #include <sys/types.h>
33 #include "uci_internal.h"
38 * Fetch a new line from the input stream and resize buffer if necessary
40 __private void uci_getln(struct uci_context *ctx, int offset)
42 struct uci_parse_context *pctx = ctx->pctx;
46 if (pctx->buf == NULL) {
47 pctx->buf = uci_malloc(ctx, LINEBUF);
48 pctx->bufsz = LINEBUF;
50 /* It takes 2 slots for fgets to read 1 char. */
51 if (offset >= pctx->bufsz - 1) {
53 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
61 p = fgets(p, pctx->bufsz - ofs, pctx->file);
66 if (pctx->buf[ofs - 1] == '\n') {
72 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
74 UCI_THROW(ctx, UCI_ERR_MEM);
79 * parse a character escaped by '\'
80 * returns true if the escaped character is to be parsed
81 * returns false if the escaped character is to be ignored
83 static bool parse_backslash(struct uci_context *ctx)
85 struct uci_parse_context *pctx = ctx->pctx;
90 /* undecoded backslash at the end of line, fetch the next line */
91 if (!pctx_cur_char(pctx) ||
92 pctx_cur_char(pctx) == '\n' ||
93 (pctx_cur_char(pctx) == '\r' &&
94 pctx_char(pctx, pctx_pos(pctx) + 1) == '\n' &&
95 !pctx_char(pctx, pctx_pos(pctx) + 2))) {
96 uci_getln(ctx, pctx->pos);
100 /* FIXME: decode escaped char, necessary? */
105 * move the string pointer forward until a non-whitespace character or
108 static void skip_whitespace(struct uci_context *ctx)
110 struct uci_parse_context *pctx = ctx->pctx;
112 while (pctx_cur_char(pctx) && isspace(pctx_cur_char(pctx)))
116 static inline void addc(struct uci_context *ctx, int *pos_dest, int *pos_src)
118 struct uci_parse_context *pctx = ctx->pctx;
120 pctx_char(pctx, *pos_dest) = pctx_char(pctx, *pos_src);
126 * parse a double quoted string argument from the command line
128 static void parse_double_quote(struct uci_context *ctx, int *target)
130 struct uci_parse_context *pctx = ctx->pctx;
133 /* skip quote character */
137 c = pctx_cur_char(pctx);
143 /* Multi-line str value */
144 uci_getln(ctx, pctx->pos);
145 if (!pctx_cur_char(pctx)) {
146 uci_parse_error(ctx, "EOF with unterminated \"");
150 if (!parse_backslash(ctx))
154 addc(ctx, target, &pctx->pos);
161 * parse a single quoted string argument from the command line
163 static void parse_single_quote(struct uci_context *ctx, int *target)
165 struct uci_parse_context *pctx = ctx->pctx;
167 /* skip quote character */
171 c = pctx_cur_char(pctx);
177 /* Multi-line str value */
178 uci_getln(ctx, pctx->pos);
179 if (!pctx_cur_char(pctx))
180 uci_parse_error(ctx, "EOF with unterminated '");
184 addc(ctx, target, &pctx->pos);
190 * parse a string from the command line and detect the quoting style
192 static void parse_str(struct uci_context *ctx, int *target)
194 struct uci_parse_context *pctx = ctx->pctx;
197 switch(pctx_cur_char(pctx)) {
199 parse_single_quote(ctx, target);
202 parse_double_quote(ctx, target);
205 pctx_cur_char(pctx) = 0;
213 if (!parse_backslash(ctx))
217 addc(ctx, target, &pctx->pos);
220 } while (pctx_cur_char(pctx) && !isspace(pctx_cur_char(pctx)));
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
228 if (pctx_cur_char(pctx) && next)
231 /* terminate the parsed string */
232 pctx_char(pctx, *target) = 0;
236 * extract the next argument from the command line
238 static int next_arg(struct uci_context *ctx, bool required, bool name, bool package)
240 struct uci_parse_context *pctx = ctx->pctx;
243 skip_whitespace(ctx);
244 val = ptr = pctx_pos(pctx);
245 if (pctx_cur_char(pctx) == ';') {
246 pctx_cur_char(pctx) = 0;
249 parse_str(ctx, &ptr);
251 if (!pctx_char(pctx, val)) {
253 uci_parse_error(ctx, "insufficient arguments");
257 if (name && !uci_validate_str(pctx_str(pctx, val), name, package))
258 uci_parse_error(ctx, "invalid character in name field");
264 int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result)
269 UCI_ASSERT(ctx, str != NULL);
270 UCI_ASSERT(ctx, result != NULL);
272 if (ctx->pctx && (ctx->pctx->file != stream))
276 uci_alloc_parse_context(ctx);
278 ctx->pctx->file = stream;
284 ofs_result = next_arg(ctx, false, false, false);
285 *result = pctx_str(ctx->pctx, ofs_result);
286 *str = pctx_cur_str(ctx->pctx);
292 uci_fill_ptr(struct uci_context *ctx, struct uci_ptr *ptr, struct uci_element *e)
294 UCI_ASSERT(ctx, ptr != NULL);
295 UCI_ASSERT(ctx, e != NULL);
297 memset(ptr, 0, sizeof(struct uci_ptr));
299 case UCI_TYPE_OPTION:
300 ptr->o = uci_to_option(e);
302 case UCI_TYPE_SECTION:
303 ptr->s = uci_to_section(e);
305 case UCI_TYPE_PACKAGE:
306 ptr->p = uci_to_package(e);
309 UCI_THROW(ctx, UCI_ERR_INVAL);
313 ptr->option = ptr->o->e.name;
314 ptr->s = ptr->o->section;
316 ptr->section = ptr->s->e.name;
317 ptr->p = ptr->s->package;
319 ptr->package = ptr->p->e.name;
321 ptr->flags |= UCI_LOOKUP_DONE;
329 * verify that the end of the line or command is reached.
330 * throw an error if extra arguments are given on the command line
332 static void assert_eol(struct uci_context *ctx)
337 skip_whitespace(ctx);
338 ofs_tmp = next_arg(ctx, false, false, false);
339 tmp = pctx_str(ctx->pctx, ofs_tmp);
340 if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
341 uci_parse_error(ctx, "too many arguments");
345 * switch to a different config, either triggered by uci_load, or by a
346 * 'package <...>' statement in the import file
348 static void uci_switch_config(struct uci_context *ctx)
350 struct uci_parse_context *pctx;
351 struct uci_element *e;
357 /* add the last config to main config file list */
359 pctx->package->backend = ctx->backend;
360 uci_list_add(&ctx->root, &pctx->package->e.list);
362 pctx->package = NULL;
363 pctx->section = NULL;
370 * if an older config under the same name exists, unload it
371 * ignore errors here, e.g. if the config was not found
373 e = uci_lookup_list(&ctx->root, name);
375 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
376 pctx->package = uci_alloc_package(ctx, name);
380 * parse the 'package' uci command (next config package)
382 static void uci_parse_package(struct uci_context *ctx, bool single)
384 struct uci_parse_context *pctx = ctx->pctx;
388 /* command string null-terminated by strtok */
389 pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
391 ofs_name = next_arg(ctx, true, true, true);
392 name = pctx_str(pctx, ofs_name);
397 ctx->pctx->name = name;
398 uci_switch_config(ctx);
402 * parse the 'config' uci command (open a section)
404 static void uci_parse_config(struct uci_context *ctx)
406 struct uci_parse_context *pctx = ctx->pctx;
407 struct uci_element *e;
409 int ofs_name, ofs_type;
413 uci_fixup_section(ctx, ctx->pctx->section);
414 if (!ctx->pctx->package) {
415 if (!ctx->pctx->name)
416 uci_parse_error(ctx, "attempting to import a file without a package name");
418 uci_switch_config(ctx);
421 /* command string null-terminated by strtok */
422 pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
424 ofs_type = next_arg(ctx, true, false, false);
425 type = pctx_str(pctx, ofs_type);
426 if (!uci_validate_type(type))
427 uci_parse_error(ctx, "invalid character in type field");
429 ofs_name = next_arg(ctx, false, true, false);
430 type = pctx_str(pctx, ofs_type);
431 name = pctx_str(pctx, ofs_name);
434 if (!name || !name[0]) {
435 ctx->internal = !pctx->merge;
436 UCI_NESTED(uci_add_section, ctx, pctx->package, type, &pctx->section);
438 uci_fill_ptr(ctx, &ptr, &pctx->package->e);
439 e = uci_lookup_list(&pctx->package->sections, name);
441 ptr.s = uci_to_section(e);
443 if ((ctx->flags & UCI_FLAG_STRICT) && strcmp(ptr.s->type, type))
444 uci_parse_error(ctx, "section of different type overwrites prior section with same name");
450 ctx->internal = !pctx->merge;
451 UCI_NESTED(uci_set, ctx, &ptr);
452 pctx->section = uci_to_section(ptr.last);
457 * parse the 'option' uci command (open a value)
459 static void uci_parse_option(struct uci_context *ctx, bool list)
461 struct uci_parse_context *pctx = ctx->pctx;
462 struct uci_element *e;
464 int ofs_name, ofs_value;
469 uci_parse_error(ctx, "option/list command found before the first section");
471 /* command string null-terminated by strtok */
472 pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
474 ofs_name = next_arg(ctx, true, true, false);
475 ofs_value = next_arg(ctx, false, false, false);
476 name = pctx_str(pctx, ofs_name);
477 value = pctx_str(pctx, ofs_value);
480 uci_fill_ptr(ctx, &ptr, &pctx->section->e);
481 e = uci_lookup_list(&pctx->section->options, name);
483 ptr.o = uci_to_option(e);
487 ctx->internal = !pctx->merge;
489 UCI_NESTED(uci_add_list, ctx, &ptr);
491 UCI_NESTED(uci_set, ctx, &ptr);
495 * parse a complete input line, split up combined commands by ';'
497 static void uci_parse_line(struct uci_context *ctx, bool single)
499 struct uci_parse_context *pctx = ctx->pctx;
502 /* Skip whitespace characters at the start of line */
503 skip_whitespace(ctx);
505 word = strtok(pctx_cur_str(pctx), " \t");
514 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
515 uci_parse_package(ctx, single);
520 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
521 uci_parse_config(ctx);
526 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
527 uci_parse_option(ctx, false);
532 if ((word[1] == 0) || !strcmp(word + 1, "ist"))
533 uci_parse_option(ctx, true);
542 uci_parse_error(ctx, "invalid command");
546 /* max number of characters that escaping adds to the string */
547 #define UCI_QUOTE_ESCAPE "'\\''"
550 * escape an uci string for export
552 static const char *uci_escape(struct uci_context *ctx, const char *str)
558 ctx->bufsz = LINEBUF;
559 ctx->buf = malloc(LINEBUF);
568 end = strchr(str, '\'');
570 end = str + strlen(str);
573 /* make sure that we have enough room in the buffer */
574 while (ofs + len + sizeof(UCI_QUOTE_ESCAPE) + 1 > ctx->bufsz) {
576 ctx->buf = uci_realloc(ctx, ctx->buf, ctx->bufsz);
579 /* copy the string until the character before the quote */
580 memcpy(&ctx->buf[ofs], str, len);
583 /* end of string? return the buffer */
587 memcpy(&ctx->buf[ofs], UCI_QUOTE_ESCAPE, sizeof(UCI_QUOTE_ESCAPE));
588 ofs += strlen(&ctx->buf[ofs]);
597 * export a single config package to a file stream
599 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
601 struct uci_context *ctx = p->ctx;
602 struct uci_element *s, *o, *i;
605 fprintf(stream, "package %s\n", uci_escape(ctx, p->e.name));
606 uci_foreach_element(&p->sections, s) {
607 struct uci_section *sec = uci_to_section(s);
608 fprintf(stream, "\nconfig %s", uci_escape(ctx, sec->type));
609 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
610 fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
611 fprintf(stream, "\n");
612 uci_foreach_element(&sec->options, o) {
613 struct uci_option *opt = uci_to_option(o);
615 case UCI_TYPE_STRING:
616 fprintf(stream, "\toption %s", uci_escape(ctx, opt->e.name));
617 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->v.string));
620 uci_foreach_element(&opt->v.list, i) {
621 fprintf(stream, "\tlist %s", uci_escape(ctx, opt->e.name));
622 fprintf(stream, " '%s'\n", uci_escape(ctx, i->name));
626 fprintf(stream, "\t# unknown type for option '%s'\n", uci_escape(ctx, opt->e.name));
631 fprintf(stream, "\n");
634 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
636 struct uci_element *e;
639 UCI_ASSERT(ctx, stream != NULL);
642 uci_export_package(package, stream, header);
644 uci_foreach_element(&ctx->root, e) {
645 uci_export_package(uci_to_package(e), stream, header);
652 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
654 struct uci_parse_context *pctx;
657 /* make sure no memory from previous parse attempts is leaked */
660 uci_alloc_parse_context(ctx);
663 if (package && *package && single) {
664 pctx->package = *package;
669 * If 'name' was supplied, assume that the supplied stream does not contain
670 * the appropriate 'package <name>' string to specify the config name
671 * NB: the config file can still override the package name
674 UCI_ASSERT(ctx, uci_validate_package(name));
678 while (!feof(pctx->file)) {
681 UCI_TRAP_SAVE(ctx, error);
683 uci_parse_line(ctx, single);
684 UCI_TRAP_RESTORE(ctx);
687 if (ctx->flags & UCI_FLAG_PERROR)
688 uci_perror(ctx, NULL);
689 if ((ctx->err != UCI_ERR_PARSE) ||
690 (ctx->flags & UCI_FLAG_STRICT))
691 UCI_THROW(ctx, ctx->err);
694 uci_fixup_section(ctx, ctx->pctx->section);
695 if (!pctx->package && name)
696 uci_switch_config(ctx);
698 *package = pctx->package;
700 pctx->package = NULL;
703 uci_switch_config(ctx);
705 /* no error happened, we can get rid of the parser context now */
712 static char *uci_config_path(struct uci_context *ctx, const char *name)
716 UCI_ASSERT(ctx, uci_validate_package(name));
717 filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
718 sprintf(filename, "%s/%s", ctx->confdir, name);
723 static void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
725 struct uci_package *p = *package;
726 FILE *f1, *f2 = NULL;
729 char *filename = NULL;
731 bool do_rename = false;
735 p->path = uci_config_path(ctx, p->e.name);
737 UCI_THROW(ctx, UCI_ERR_INVAL);
740 if ((asprintf(&filename, "%s/.%s.uci-XXXXXX", ctx->confdir, p->e.name) < 0) || !filename)
741 UCI_THROW(ctx, UCI_ERR_MEM);
743 /* open the config file for writing now, so that it is locked */
744 f1 = uci_open_stream(ctx, p->path, NULL, SEEK_SET, true, true);
746 /* flush unsaved changes and reload from delta file */
747 UCI_TRAP_SAVE(ctx, done);
750 name = uci_strdup(ctx, p->e.name);
751 path = uci_strdup(ctx, p->path);
752 /* dump our own changes to the delta file */
753 if (!uci_list_empty(&p->delta))
754 UCI_INTERNAL(uci_save, ctx, p);
757 * other processes might have modified the config
758 * as well. dump and reload
760 uci_free_package(&p);
762 UCI_INTERNAL(uci_import, ctx, f1, name, &p, true);
768 /* freed together with the uci_package */
773 if (!uci_load_delta(ctx, p, true))
777 if (!mktemp(filename))
782 UCI_THROW(ctx, UCI_ERR_IO);
785 if ((stat(filename, &statbuf) == 0) && ((statbuf.st_mode & S_IFMT) != S_IFREG))
786 UCI_THROW(ctx, UCI_ERR_IO);
788 f2 = uci_open_stream(ctx, filename, p->path, SEEK_SET, true, true);
789 uci_export(ctx, f2, p, false);
793 uci_close_stream(f2);
797 UCI_TRAP_RESTORE(ctx);
802 uci_close_stream(f1);
804 path = realpath(p->path, NULL);
805 if (!path || rename(filename, path)) {
807 UCI_THROW(ctx, UCI_ERR_IO);
813 UCI_THROW(ctx, ctx->err);
818 * This function returns the filename by returning the string
819 * after the last '/' character. By checking for a non-'\0'
820 * character afterwards, directories are ignored (glob marks
821 * those with a trailing '/'
823 static inline char *get_filename(char *path)
827 p = strrchr(path, '/');
834 static char **uci_list_config_files(struct uci_context *ctx)
842 dir = uci_malloc(ctx, strlen(ctx->confdir) + 1 + sizeof("/*"));
843 sprintf(dir, "%s/*", ctx->confdir);
844 if (glob(dir, GLOB_MARK, NULL, &globbuf) != 0) {
846 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
849 size = sizeof(char *) * (globbuf.gl_pathc + 1);
850 for(i = 0; i < globbuf.gl_pathc; i++) {
853 p = get_filename(globbuf.gl_pathv[i]);
857 size += strlen(p) + 1;
860 configs = uci_malloc(ctx, size);
861 buf = (char *) &configs[globbuf.gl_pathc + 1];
862 for(i = 0; i < globbuf.gl_pathc; i++) {
865 p = get_filename(globbuf.gl_pathv[i]);
869 if (!uci_validate_package(p))
874 buf += strlen(buf) + 1;
881 static struct uci_package *uci_file_load(struct uci_context *ctx, const char *name)
883 struct uci_package *package = NULL;
890 /* relative path outside of /etc/config */
892 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
895 /* absolute path outside of /etc/config */
896 filename = uci_strdup(ctx, name);
897 name = strrchr(name, '/') + 1;
901 /* config in /etc/config */
902 filename = uci_config_path(ctx, name);
907 UCI_TRAP_SAVE(ctx, done);
908 file = uci_open_stream(ctx, filename, NULL, SEEK_SET, false, false);
910 UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
911 UCI_TRAP_RESTORE(ctx);
914 package->path = filename;
915 package->has_delta = confdir;
916 uci_load_delta(ctx, package, false);
920 uci_close_stream(file);
923 UCI_THROW(ctx, ctx->err);
928 __private UCI_BACKEND(uci_file_backend, "file",
929 .load = uci_file_load,
930 .commit = uci_file_commit,
931 .list_configs = uci_list_config_files,