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"
36 #define LINEBUF_MAX 4096
39 * Fetch a new line from the input stream and resize buffer if necessary
41 __private
void uci_getln(struct uci_context
*ctx
, int offset
)
43 struct uci_parse_context
*pctx
= ctx
->pctx
;
47 if (pctx
->buf
== NULL
) {
48 pctx
->buf
= uci_malloc(ctx
, LINEBUF
);
49 pctx
->bufsz
= LINEBUF
;
51 /* It takes 2 slots for fgets to read 1 char. */
52 if (offset
>= pctx
->bufsz
- 1) {
54 pctx
->buf
= uci_realloc(ctx
, pctx
->buf
, pctx
->bufsz
);
62 p
= fgets(p
, pctx
->bufsz
- ofs
, pctx
->file
);
67 if (pctx
->buf
[ofs
- 1] == '\n') {
72 if (pctx
->bufsz
> LINEBUF_MAX
/2)
73 uci_parse_error(ctx
, "line too long");
76 pctx
->buf
= uci_realloc(ctx
, pctx
->buf
, pctx
->bufsz
);
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
85 static bool parse_backslash(struct uci_context
*ctx
)
87 struct uci_parse_context
*pctx
= ctx
->pctx
;
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
);
102 /* FIXME: decode escaped char, necessary? */
107 * move the string pointer forward until a non-whitespace character or
110 static void skip_whitespace(struct uci_context
*ctx
)
112 struct uci_parse_context
*pctx
= ctx
->pctx
;
114 while (pctx_cur_char(pctx
) && isspace(pctx_cur_char(pctx
)))
118 static inline void addc(struct uci_context
*ctx
, int *pos_dest
, int *pos_src
)
120 struct uci_parse_context
*pctx
= ctx
->pctx
;
122 pctx_char(pctx
, *pos_dest
) = pctx_char(pctx
, *pos_src
);
128 * parse a double quoted string argument from the command line
130 static void parse_double_quote(struct uci_context
*ctx
, int *target
)
132 struct uci_parse_context
*pctx
= ctx
->pctx
;
135 /* skip quote character */
139 c
= pctx_cur_char(pctx
);
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 \"");
152 if (!parse_backslash(ctx
))
156 addc(ctx
, target
, &pctx
->pos
);
163 * parse a single quoted string argument from the command line
165 static void parse_single_quote(struct uci_context
*ctx
, int *target
)
167 struct uci_parse_context
*pctx
= ctx
->pctx
;
169 /* skip quote character */
173 c
= pctx_cur_char(pctx
);
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 '");
186 addc(ctx
, target
, &pctx
->pos
);
192 * parse a string from the command line and detect the quoting style
194 static void parse_str(struct uci_context
*ctx
, int *target
)
196 struct uci_parse_context
*pctx
= ctx
->pctx
;
199 switch(pctx_cur_char(pctx
)) {
201 parse_single_quote(ctx
, target
);
204 parse_double_quote(ctx
, target
);
207 pctx_cur_char(pctx
) = 0;
215 if (!parse_backslash(ctx
))
219 addc(ctx
, target
, &pctx
->pos
);
222 } while (pctx_cur_char(pctx
) && !isspace(pctx_cur_char(pctx
)));
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
230 if (pctx_cur_char(pctx
) && next
)
233 /* terminate the parsed string */
234 pctx_char(pctx
, *target
) = 0;
238 * extract the next argument from the command line
240 static int next_arg(struct uci_context
*ctx
, bool required
, bool name
)
242 struct uci_parse_context
*pctx
= ctx
->pctx
;
245 skip_whitespace(ctx
);
246 val
= ptr
= pctx_pos(pctx
);
247 if (pctx_cur_char(pctx
) == ';') {
248 pctx_cur_char(pctx
) = 0;
251 parse_str(ctx
, &ptr
);
253 if (!pctx_char(pctx
, val
)) {
255 uci_parse_error(ctx
, "insufficient arguments");
259 if (name
&& !uci_validate_name(pctx_str(pctx
, val
)))
260 uci_parse_error(ctx
, "invalid character in name field");
266 int uci_parse_argument(struct uci_context
*ctx
, FILE *stream
, char **str
, char **result
)
271 UCI_ASSERT(ctx
, str
!= NULL
);
272 UCI_ASSERT(ctx
, result
!= NULL
);
274 if (ctx
->pctx
&& (ctx
->pctx
->file
!= stream
))
278 uci_alloc_parse_context(ctx
);
280 ctx
->pctx
->file
= stream
;
284 *str
= ctx
->pctx
->buf
;
286 UCI_ASSERT(ctx
, ctx
->pctx
->pos
== *str
- ctx
->pctx
->buf
);
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
);
298 uci_fill_ptr(struct uci_context
*ctx
, struct uci_ptr
*ptr
, struct uci_element
*e
)
300 UCI_ASSERT(ctx
, ptr
!= NULL
);
301 UCI_ASSERT(ctx
, e
!= NULL
);
303 memset(ptr
, 0, sizeof(struct uci_ptr
));
305 case UCI_TYPE_OPTION
:
306 ptr
->o
= uci_to_option(e
);
308 case UCI_TYPE_SECTION
:
309 ptr
->s
= uci_to_section(e
);
311 case UCI_TYPE_PACKAGE
:
312 ptr
->p
= uci_to_package(e
);
315 UCI_THROW(ctx
, UCI_ERR_INVAL
);
319 ptr
->option
= ptr
->o
->e
.name
;
320 ptr
->s
= ptr
->o
->section
;
322 ptr
->section
= ptr
->s
->e
.name
;
323 ptr
->p
= ptr
->s
->package
;
325 ptr
->package
= ptr
->p
->e
.name
;
327 ptr
->flags
|= UCI_LOOKUP_DONE
;
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
338 static void assert_eol(struct uci_context
*ctx
)
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");
351 * switch to a different config, either triggered by uci_load, or by a
352 * 'package <...>' statement in the import file
354 static void uci_switch_config(struct uci_context
*ctx
)
356 struct uci_parse_context
*pctx
;
357 struct uci_element
*e
;
363 /* add the last config to main config file list */
365 pctx
->package
->backend
= ctx
->backend
;
366 uci_list_add(&ctx
->root
, &pctx
->package
->e
.list
);
368 pctx
->package
= NULL
;
369 pctx
->section
= NULL
;
376 * if an older config under the same name exists, unload it
377 * ignore errors here, e.g. if the config was not found
379 e
= uci_lookup_list(&ctx
->root
, name
);
381 UCI_THROW(ctx
, UCI_ERR_DUPLICATE
);
382 pctx
->package
= uci_alloc_package(ctx
, name
);
386 * parse the 'package' uci command (next config package)
388 static void uci_parse_package(struct uci_context
*ctx
, bool single
)
390 struct uci_parse_context
*pctx
= ctx
->pctx
;
394 /* command string null-terminated by strtok */
395 pctx
->pos
+= strlen(pctx_cur_str(pctx
)) + 1;
397 ofs_name
= next_arg(ctx
, true, true);
398 name
= pctx_str(pctx
, ofs_name
);
403 ctx
->pctx
->name
= name
;
404 uci_switch_config(ctx
);
408 * parse the 'config' uci command (open a section)
410 static void uci_parse_config(struct uci_context
*ctx
)
412 struct uci_parse_context
*pctx
= ctx
->pctx
;
413 struct uci_element
*e
;
415 int ofs_name
, ofs_type
;
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");
424 uci_switch_config(ctx
);
427 /* command string null-terminated by strtok */
428 pctx
->pos
+= strlen(pctx_cur_str(pctx
)) + 1;
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");
435 ofs_name
= next_arg(ctx
, false, true);
436 type
= pctx_str(pctx
, ofs_type
);
437 name
= pctx_str(pctx
, ofs_name
);
440 if (!name
|| !name
[0]) {
441 ctx
->internal
= !pctx
->merge
;
442 UCI_NESTED(uci_add_section
, ctx
, pctx
->package
, type
, &pctx
->section
);
444 uci_fill_ptr(ctx
, &ptr
, &pctx
->package
->e
);
445 e
= uci_lookup_list(&pctx
->package
->sections
, name
);
447 ptr
.s
= uci_to_section(e
);
451 ctx
->internal
= !pctx
->merge
;
452 UCI_NESTED(uci_set
, ctx
, &ptr
);
453 pctx
->section
= uci_to_section(ptr
.last
);
458 * parse the 'option' uci command (open a value)
460 static void uci_parse_option(struct uci_context
*ctx
, bool list
)
462 struct uci_parse_context
*pctx
= ctx
->pctx
;
463 struct uci_element
*e
;
465 int ofs_name
, ofs_value
;
470 uci_parse_error(ctx
, "option/list command found before the first section");
472 /* command string null-terminated by strtok */
473 pctx
->pos
+= strlen(pctx_cur_str(pctx
)) + 1;
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
);
481 uci_fill_ptr(ctx
, &ptr
, &pctx
->section
->e
);
482 e
= uci_lookup_list(&pctx
->section
->options
, name
);
484 ptr
.o
= uci_to_option(e
);
488 ctx
->internal
= !pctx
->merge
;
490 UCI_NESTED(uci_add_list
, ctx
, &ptr
);
492 UCI_NESTED(uci_set
, ctx
, &ptr
);
496 * parse a complete input line, split up combined commands by ';'
498 static void uci_parse_line(struct uci_context
*ctx
, bool single
)
500 struct uci_parse_context
*pctx
= ctx
->pctx
;
503 /* Skip whitespace characters at the start of line */
504 skip_whitespace(ctx
);
506 word
= strtok(pctx_cur_str(pctx
), " \t");
515 if ((word
[1] == 0) || !strcmp(word
+ 1, "ackage"))
516 uci_parse_package(ctx
, single
);
521 if ((word
[1] == 0) || !strcmp(word
+ 1, "onfig"))
522 uci_parse_config(ctx
);
527 if ((word
[1] == 0) || !strcmp(word
+ 1, "ption"))
528 uci_parse_option(ctx
, false);
533 if ((word
[1] == 0) || !strcmp(word
+ 1, "ist"))
534 uci_parse_option(ctx
, true);
543 uci_parse_error(ctx
, "invalid command");
547 /* max number of characters that escaping adds to the string */
548 #define UCI_QUOTE_ESCAPE "'\\''"
551 * escape an uci string for export
553 static const char *uci_escape(struct uci_context
*ctx
, const char *str
)
559 ctx
->bufsz
= LINEBUF
;
560 ctx
->buf
= malloc(LINEBUF
);
569 end
= strchr(str
, '\'');
571 end
= str
+ strlen(str
);
574 /* make sure that we have enough room in the buffer */
575 while (ofs
+ len
+ sizeof(UCI_QUOTE_ESCAPE
) + 1 > ctx
->bufsz
) {
577 ctx
->buf
= uci_realloc(ctx
, ctx
->buf
, ctx
->bufsz
);
580 /* copy the string until the character before the quote */
581 memcpy(&ctx
->buf
[ofs
], str
, len
);
584 /* end of string? return the buffer */
588 memcpy(&ctx
->buf
[ofs
], UCI_QUOTE_ESCAPE
, sizeof(UCI_QUOTE_ESCAPE
));
589 ofs
+= strlen(&ctx
->buf
[ofs
]);
598 * export a single config package to a file stream
600 static void uci_export_package(struct uci_package
*p
, FILE *stream
, bool header
)
602 struct uci_context
*ctx
= p
->ctx
;
603 struct uci_element
*s
, *o
, *i
;
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
);
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
));
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
));
627 fprintf(stream
, "\t# unknown type for option '%s'\n", uci_escape(ctx
, opt
->e
.name
));
632 fprintf(stream
, "\n");
635 int uci_export(struct uci_context
*ctx
, FILE *stream
, struct uci_package
*package
, bool header
)
637 struct uci_element
*e
;
640 UCI_ASSERT(ctx
, stream
!= NULL
);
643 uci_export_package(package
, stream
, header
);
645 uci_foreach_element(&ctx
->root
, e
) {
646 uci_export_package(uci_to_package(e
), stream
, header
);
653 int uci_import(struct uci_context
*ctx
, FILE *stream
, const char *name
, struct uci_package
**package
, bool single
)
655 struct uci_parse_context
*pctx
;
658 /* make sure no memory from previous parse attempts is leaked */
661 uci_alloc_parse_context(ctx
);
664 if (package
&& *package
&& single
) {
665 pctx
->package
= *package
;
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
675 UCI_ASSERT(ctx
, uci_validate_package(name
));
679 while (!feof(pctx
->file
)) {
682 UCI_TRAP_SAVE(ctx
, error
);
684 uci_parse_line(ctx
, single
);
685 UCI_TRAP_RESTORE(ctx
);
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
);
695 uci_fixup_section(ctx
, ctx
->pctx
->section
);
696 if (!pctx
->package
&& name
)
697 uci_switch_config(ctx
);
699 *package
= pctx
->package
;
701 pctx
->package
= NULL
;
704 uci_switch_config(ctx
);
706 /* no error happened, we can get rid of the parser context now */
713 static char *uci_config_path(struct uci_context
*ctx
, const char *name
)
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
);
724 static void uci_file_commit(struct uci_context
*ctx
, struct uci_package
**package
, bool overwrite
)
726 struct uci_package
*p
= *package
;
727 FILE *f1
, *f2
= NULL
;
730 char *filename
= NULL
;
732 bool do_rename
= false;
736 p
->path
= uci_config_path(ctx
, p
->e
.name
);
738 UCI_THROW(ctx
, UCI_ERR_INVAL
);
741 if ((asprintf(&filename
, "%s/.%s.uci-XXXXXX", ctx
->confdir
, p
->e
.name
) < 0) || !filename
)
742 UCI_THROW(ctx
, UCI_ERR_MEM
);
744 if (!mktemp(filename
))
749 UCI_THROW(ctx
, UCI_ERR_IO
);
752 if ((stat(filename
, &statbuf
) == 0) && ((statbuf
.st_mode
& S_IFMT
) != S_IFREG
))
753 UCI_THROW(ctx
, UCI_ERR_IO
);
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);
758 /* flush unsaved changes and reload from delta file */
759 UCI_TRAP_SAVE(ctx
, done
);
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
);
769 * other processes might have modified the config
770 * as well. dump and reload
772 uci_free_package(&p
);
774 UCI_INTERNAL(uci_import
, ctx
, f1
, name
, &p
, true);
780 /* freed together with the uci_package */
785 if (!uci_load_delta(ctx
, p
, true))
789 f2
= uci_open_stream(ctx
, filename
, p
->path
, SEEK_SET
, true, true);
790 uci_export(ctx
, f2
, p
, false);
794 uci_close_stream(f2
);
798 UCI_TRAP_RESTORE(ctx
);
803 uci_close_stream(f1
);
804 if (do_rename
&& rename(filename
, p
->path
)) {
806 UCI_THROW(ctx
, UCI_ERR_IO
);
811 UCI_THROW(ctx
, ctx
->err
);
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 '/'
821 static inline char *get_filename(char *path
)
825 p
= strrchr(path
, '/');
832 static char **uci_list_config_files(struct uci_context
*ctx
)
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) {
844 UCI_THROW(ctx
, UCI_ERR_NOTFOUND
);
847 size
= sizeof(char *) * (globbuf
.gl_pathc
+ 1);
848 for(i
= 0; i
< globbuf
.gl_pathc
; i
++) {
851 p
= get_filename(globbuf
.gl_pathv
[i
]);
855 size
+= strlen(p
) + 1;
858 configs
= uci_malloc(ctx
, size
);
859 buf
= (char *) &configs
[globbuf
.gl_pathc
+ 1];
860 for(i
= 0; i
< globbuf
.gl_pathc
; i
++) {
863 p
= get_filename(globbuf
.gl_pathv
[i
]);
867 if (!uci_validate_package(p
))
872 buf
+= strlen(buf
) + 1;
879 static struct uci_package
*uci_file_load(struct uci_context
*ctx
, const char *name
)
881 struct uci_package
*package
= NULL
;
888 /* relative path outside of /etc/config */
890 UCI_THROW(ctx
, UCI_ERR_NOTFOUND
);
893 /* absolute path outside of /etc/config */
894 filename
= uci_strdup(ctx
, name
);
895 name
= strrchr(name
, '/') + 1;
899 /* config in /etc/config */
900 filename
= uci_config_path(ctx
, name
);
905 UCI_TRAP_SAVE(ctx
, done
);
906 file
= uci_open_stream(ctx
, filename
, NULL
, SEEK_SET
, false, false);
908 UCI_INTERNAL(uci_import
, ctx
, file
, name
, &package
, true);
909 UCI_TRAP_RESTORE(ctx
);
912 package
->path
= filename
;
913 package
->has_delta
= confdir
;
914 uci_load_delta(ctx
, package
, false);
918 uci_close_stream(file
);
921 UCI_THROW(ctx
, ctx
->err
);
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
,