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>
28 #define LINEBUF_MAX 4096
30 static void uci_parse_error(struct uci_context
*ctx
, char *pos
, char *reason
)
32 struct uci_parse_context
*pctx
= ctx
->pctx
;
34 pctx
->reason
= reason
;
35 pctx
->byte
= pos
- pctx
->buf
;
36 UCI_THROW(ctx
, UCI_ERR_PARSE
);
40 * Fetch a new line from the input stream and resize buffer if necessary
42 static void uci_getln(struct uci_context
*ctx
, int offset
)
44 struct uci_parse_context
*pctx
= ctx
->pctx
;
48 if (pctx
->buf
== NULL
) {
49 pctx
->buf
= uci_malloc(ctx
, LINEBUF
);
50 pctx
->bufsz
= LINEBUF
;
58 p
= fgets(p
, pctx
->bufsz
- ofs
, pctx
->file
);
63 if (pctx
->buf
[ofs
- 1] == '\n') {
65 pctx
->buf
[ofs
- 1] = 0;
69 if (pctx
->bufsz
> LINEBUF_MAX
/2)
70 uci_parse_error(ctx
, p
, "line too long");
73 pctx
->buf
= uci_realloc(ctx
, pctx
->buf
, pctx
->bufsz
);
78 * Clean up all extra memory used by the parser and exporter
80 static void uci_file_cleanup(struct uci_context
*ctx
)
82 struct uci_parse_context
*pctx
;
96 uci_free_package(pctx
->package
);
107 * parse a character escaped by '\'
108 * returns true if the escaped character is to be parsed
109 * returns false if the escaped character is to be ignored
111 static inline bool parse_backslash(struct uci_context
*ctx
, char **str
)
116 /* undecoded backslash at the end of line, fetch the next line */
119 uci_getln(ctx
, *str
- ctx
->pctx
->buf
);
123 /* FIXME: decode escaped char, necessary? */
128 * move the string pointer forward until a non-whitespace character or
131 static void skip_whitespace(struct uci_context
*ctx
, char **str
)
134 while (**str
&& isspace(**str
))
138 if (!parse_backslash(ctx
, str
))
143 static inline void addc(char **dest
, char **src
)
151 * parse a double quoted string argument from the command line
153 static void parse_double_quote(struct uci_context
*ctx
, char **str
, char **target
)
157 /* skip quote character */
160 while ((c
= **str
)) {
167 if (!parse_backslash(ctx
, str
))
175 uci_parse_error(ctx
, *str
, "unterminated \"");
179 * parse a single quoted string argument from the command line
181 static void parse_single_quote(struct uci_context
*ctx
, char **str
, char **target
)
184 /* skip quote character */
187 while ((c
= **str
)) {
197 uci_parse_error(ctx
, *str
, "unterminated '");
201 * parse a string from the command line and detect the quoting style
203 static void parse_str(struct uci_context
*ctx
, char **str
, char **target
)
208 parse_single_quote(ctx
, str
, target
);
211 parse_double_quote(ctx
, str
, target
);
216 if (!parse_backslash(ctx
, str
))
223 } while (**str
&& !isspace(**str
));
227 * if the string was unquoted and we've stopped at a whitespace
228 * character, skip to the next one, because the whitespace will
229 * be overwritten by a null byte here
234 /* terminate the parsed string */
239 * extract the next argument from the command line
241 static char *next_arg(struct uci_context
*ctx
, char **str
, bool required
)
247 skip_whitespace(ctx
, str
);
248 parse_str(ctx
, str
, &ptr
);
249 if (required
&& !*val
)
250 uci_parse_error(ctx
, *str
, "insufficient arguments");
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 uci_parse_error(ctx
, *str
, "too many arguments");
269 * switch to a different config, either triggered by uci_load, or by a
270 * 'package <...>' statement in the import file
272 static void uci_switch_config(struct uci_context
*ctx
)
274 struct uci_parse_context
*pctx
;
275 struct uci_element
*e
;
281 /* add the last config to main config file list */
283 uci_list_add(&ctx
->root
, &pctx
->package
->e
.list
);
285 pctx
->package
= NULL
;
286 pctx
->section
= NULL
;
293 * if an older config under the same name exists, unload it
294 * ignore errors here, e.g. if the config was not found
296 e
= uci_lookup_list(ctx
, &ctx
->root
, name
);
298 UCI_THROW(ctx
, UCI_ERR_DUPLICATE
);
299 pctx
->package
= uci_alloc_package(ctx
, name
);
303 * parse the 'package' uci command (next config package)
305 static void uci_parse_package(struct uci_context
*ctx
, char **str
, bool single
)
309 /* command string null-terminated by strtok */
310 *str
+= strlen(*str
) + 1;
312 name
= next_arg(ctx
, str
, true);
313 assert_eol(ctx
, str
);
317 ctx
->pctx
->name
= name
;
318 uci_switch_config(ctx
);
322 * parse the 'config' uci command (open a section)
324 static void uci_parse_config(struct uci_context
*ctx
, char **str
)
329 if (!ctx
->pctx
->package
) {
330 if (!ctx
->pctx
->name
)
331 uci_parse_error(ctx
, *str
, "attempting to import a file without a package name");
333 uci_switch_config(ctx
);
336 /* command string null-terminated by strtok */
337 *str
+= strlen(*str
) + 1;
339 type
= next_arg(ctx
, str
, true);
340 name
= next_arg(ctx
, str
, false);
341 assert_eol(ctx
, str
);
342 ctx
->pctx
->section
= uci_alloc_section(ctx
->pctx
->package
, type
, name
);
346 * parse the 'option' uci command (open a value)
348 static void uci_parse_option(struct uci_context
*ctx
, char **str
)
353 if (!ctx
->pctx
->section
)
354 uci_parse_error(ctx
, *str
, "option command found before the first section");
356 /* command string null-terminated by strtok */
357 *str
+= strlen(*str
) + 1;
359 name
= next_arg(ctx
, str
, true);
360 value
= next_arg(ctx
, str
, true);
361 assert_eol(ctx
, str
);
362 uci_alloc_option(ctx
->pctx
->section
, name
, value
);
367 * parse a complete input line, split up combined commands by ';'
369 static void uci_parse_line(struct uci_context
*ctx
, bool single
)
371 struct uci_parse_context
*pctx
= ctx
->pctx
;
372 char *word
, *brk
= NULL
;
374 for (word
= strtok_r(pctx
->buf
, ";", &brk
);
376 word
= strtok_r(NULL
, ";", &brk
)) {
379 word
= strtok_r(word
, " \t", &pbrk
);
383 if ((word
[1] == 0) || !strcmp(word
+ 1, "ackage"))
384 uci_parse_package(ctx
, &word
, single
);
387 if ((word
[1] == 0) || !strcmp(word
+ 1, "onfig"))
388 uci_parse_config(ctx
, &word
);
391 if ((word
[1] == 0) || !strcmp(word
+ 1, "ption"))
392 uci_parse_option(ctx
, &word
);
395 uci_parse_error(ctx
, word
, "unterminated command");
401 /* max number of characters that escaping adds to the string */
402 #define UCI_QUOTE_ESCAPE "'\\''"
405 * escape an uci string for export
407 static char *uci_escape(struct uci_context
*ctx
, char *str
)
413 ctx
->bufsz
= LINEBUF
;
414 ctx
->buf
= malloc(LINEBUF
);
418 p
= strchr(str
, '\'');
425 if (p
+ sizeof(UCI_QUOTE_ESCAPE
) - str
>= ctx
->bufsz
) {
427 ctx
->buf
= realloc(ctx
->buf
, ctx
->bufsz
);
429 UCI_THROW(ctx
, UCI_ERR_MEM
);
431 memcpy(&ctx
->buf
[pos
], s
, len
);
434 strcpy(&ctx
->buf
[pos
], UCI_QUOTE_ESCAPE
);
435 pos
+= sizeof(UCI_QUOTE_ESCAPE
);
437 } while ((p
= strchr(s
, '\'')));
444 * export a single config package to a file stream
446 static void uci_export_package(struct uci_package
*p
, FILE *stream
, bool header
)
448 struct uci_context
*ctx
= p
->ctx
;
449 struct uci_element
*s
, *o
;
452 fprintf(stream
, "package '%s'\n", uci_escape(ctx
, p
->e
.name
));
453 uci_foreach_element(&p
->sections
, s
) {
454 struct uci_section
*sec
= uci_to_section(s
);
455 fprintf(stream
, "\nconfig '%s'", uci_escape(ctx
, sec
->type
));
456 fprintf(stream
, " '%s'\n", uci_escape(ctx
, sec
->e
.name
));
457 uci_foreach_element(&sec
->options
, o
) {
458 struct uci_option
*opt
= uci_to_option(o
);
459 fprintf(stream
, "\toption '%s'", uci_escape(ctx
, opt
->e
.name
));
460 fprintf(stream
, " '%s'\n", uci_escape(ctx
, opt
->value
));
463 fprintf(stream
, "\n");
466 int uci_export(struct uci_context
*ctx
, FILE *stream
, struct uci_package
*package
, bool header
)
468 struct uci_element
*e
;
471 UCI_ASSERT(ctx
, stream
!= NULL
);
474 uci_export_package(package
, stream
, header
);
476 uci_foreach_element(&ctx
->root
, e
) {
477 uci_export_package(uci_to_package(e
), stream
, header
);
484 int uci_import(struct uci_context
*ctx
, FILE *stream
, const char *name
, struct uci_package
**package
, bool single
)
486 struct uci_parse_context
*pctx
;
488 /* make sure no memory from previous parse attempts is leaked */
489 uci_file_cleanup(ctx
);
491 pctx
= (struct uci_parse_context
*) uci_malloc(ctx
, sizeof(struct uci_parse_context
));
496 * If 'name' was supplied, assume that the supplied stream does not contain
497 * the appropriate 'package <name>' string to specify the config name
498 * NB: the config file can still override the package name
503 while (!feof(pctx
->file
)) {
506 uci_parse_line(ctx
, single
);
510 *package
= pctx
->package
;
513 uci_switch_config(ctx
);
515 /* no error happened, we can get rid of the parser context now */
516 uci_file_cleanup(ctx
);
521 int uci_load(struct uci_context
*ctx
, const char *name
, struct uci_package
**package
)
530 UCI_ASSERT(ctx
, name
!= NULL
);
535 UCI_THROW(ctx
, UCI_ERR_NOTFOUND
);
538 /* absolute/relative path outside of /etc/config */
539 filename
= uci_strdup(ctx
, name
);
540 name
= strrchr(name
, '/') + 1;
544 filename
= uci_malloc(ctx
, strlen(name
) + sizeof(UCI_CONFDIR
) + 2);
545 sprintf(filename
, UCI_CONFDIR
"/%s", name
);
550 if ((stat(filename
, &statbuf
) < 0) ||
551 ((statbuf
.st_mode
& S_IFMT
) != S_IFREG
)) {
552 UCI_THROW(ctx
, UCI_ERR_NOTFOUND
);
555 fd
= open(filename
, O_RDONLY
);
557 UCI_THROW(ctx
, UCI_ERR_IO
);
559 if (flock(fd
, LOCK_SH
) < 0)
560 UCI_THROW(ctx
, UCI_ERR_IO
);
562 file
= fdopen(fd
, "r");
564 UCI_THROW(ctx
, UCI_ERR_IO
);
567 UCI_TRAP_SAVE(ctx
, done
);
568 uci_import(ctx
, file
, name
, package
, true);
569 UCI_TRAP_RESTORE(ctx
);
572 (*package
)->path
= filename
;
573 (*package
)->confdir
= confdir
;
582 int uci_commit(struct uci_context
*ctx
, struct uci_package
*p
)
586 int err
= UCI_ERR_IO
;
589 UCI_ASSERT(ctx
, p
!= NULL
);
590 UCI_ASSERT(ctx
, p
->path
!= NULL
);
592 fd
= open(p
->path
, O_RDWR
);
596 if (flock(fd
, LOCK_EX
) < 0)
604 UCI_TRAP_SAVE(ctx
, done
);
605 uci_export(ctx
, f
, p
, false);
606 UCI_TRAP_RESTORE(ctx
);
615 UCI_THROW(ctx
, ctx
->errno
);
617 UCI_THROW(ctx
, UCI_ERR_IO
);
623 * This function returns the filename by returning the string
624 * after the last '/' character. By checking for a non-'\0'
625 * character afterwards, directories are ignored (glob marks
626 * those with a trailing '/'
628 static inline char *get_filename(char *path
)
632 p
= strrchr(path
, '/');
639 char **uci_list_configs(struct uci_context
*ctx
)
646 if (glob(UCI_CONFDIR
"/*", GLOB_MARK
, NULL
, &globbuf
) != 0)
649 size
= sizeof(char *) * (globbuf
.gl_pathc
+ 1);
650 for(i
= 0; i
< globbuf
.gl_pathc
; i
++) {
653 p
= get_filename(globbuf
.gl_pathv
[i
]);
657 size
+= strlen(p
) + 1;
660 configs
= malloc(size
);
664 memset(configs
, 0, size
);
665 buf
= (char *) &configs
[globbuf
.gl_pathc
+ 1];
666 for(i
= 0; i
< globbuf
.gl_pathc
; i
++) {
669 p
= get_filename(globbuf
.gl_pathv
[i
]);
675 buf
+= strlen(buf
) + 1;