95469c5f64e7b221621ee27b29fc2e45fb549bba
[project/uci.git] / 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 General Public License for more details.
13 */
14
15 /*
16 * This file contains the code for parsing uci config files
17 */
18
19 #include <sys/types.h>
20 #include <sys/stat.h>
21 #include <stdbool.h>
22 #include <unistd.h>
23 #include <fcntl.h>
24 #include <stdio.h>
25 #include <ctype.h>
26
27 #define LINEBUF 32
28 #define LINEBUF_MAX 4096
29
30 static void uci_parse_error(struct uci_context *ctx, char *pos, char *reason)
31 {
32 struct uci_parse_context *pctx = ctx->pctx;
33
34 pctx->reason = reason;
35 pctx->byte = pos - pctx->buf;
36 UCI_THROW(ctx, UCI_ERR_PARSE);
37 }
38
39 /*
40 * Fetch a new line from the input stream and resize buffer if necessary
41 */
42 static void uci_getln(struct uci_context *ctx, int offset)
43 {
44 struct uci_parse_context *pctx = ctx->pctx;
45 char *p;
46 int ofs;
47
48 if (pctx->buf == NULL) {
49 pctx->buf = uci_malloc(ctx, LINEBUF);
50 pctx->bufsz = LINEBUF;
51 }
52
53 ofs = offset;
54 do {
55 p = &pctx->buf[ofs];
56 p[ofs] = 0;
57
58 p = fgets(p, pctx->bufsz - ofs, pctx->file);
59 if (!p || !*p)
60 return;
61
62 ofs += strlen(p);
63 if (pctx->buf[ofs - 1] == '\n') {
64 pctx->line++;
65 pctx->buf[ofs - 1] = 0;
66 return;
67 }
68
69 if (pctx->bufsz > LINEBUF_MAX/2)
70 uci_parse_error(ctx, p, "line too long");
71
72 pctx->bufsz *= 2;
73 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
74 } while (1);
75 }
76
77 /*
78 * Clean up all extra memory used by the parser and exporter
79 */
80 static void uci_file_cleanup(struct uci_context *ctx)
81 {
82 struct uci_parse_context *pctx;
83
84 if (ctx->buf) {
85 free(ctx->buf);
86 ctx->buf = NULL;
87 ctx->bufsz = 0;
88 }
89
90 pctx = ctx->pctx;
91 if (!pctx)
92 return;
93
94 ctx->pctx = NULL;
95 if (pctx->package)
96 uci_free_package(&pctx->package);
97
98 if (pctx->buf)
99 free(pctx->buf);
100
101 free(pctx);
102 }
103
104 /*
105 * parse a character escaped by '\'
106 * returns true if the escaped character is to be parsed
107 * returns false if the escaped character is to be ignored
108 */
109 static inline bool parse_backslash(struct uci_context *ctx, char **str)
110 {
111 /* skip backslash */
112 *str += 1;
113
114 /* undecoded backslash at the end of line, fetch the next line */
115 if (!**str) {
116 *str += 1;
117 uci_getln(ctx, *str - ctx->pctx->buf);
118 return false;
119 }
120
121 /* FIXME: decode escaped char, necessary? */
122 return true;
123 }
124
125 /*
126 * move the string pointer forward until a non-whitespace character or
127 * EOL is reached
128 */
129 static void skip_whitespace(struct uci_context *ctx, char **str)
130 {
131 restart:
132 while (**str && isspace(**str))
133 *str += 1;
134
135 if (**str == '\\') {
136 if (!parse_backslash(ctx, str))
137 goto restart;
138 }
139 }
140
141 static inline void addc(char **dest, char **src)
142 {
143 **dest = **src;
144 *dest += 1;
145 *src += 1;
146 }
147
148 /*
149 * parse a double quoted string argument from the command line
150 */
151 static void parse_double_quote(struct uci_context *ctx, char **str, char **target)
152 {
153 char c;
154
155 /* skip quote character */
156 *str += 1;
157
158 while ((c = **str)) {
159 switch(c) {
160 case '"':
161 **target = 0;
162 *str += 1;
163 return;
164 case '\\':
165 if (!parse_backslash(ctx, str))
166 continue;
167 /* fall through */
168 default:
169 addc(target, str);
170 break;
171 }
172 }
173 uci_parse_error(ctx, *str, "unterminated \"");
174 }
175
176 /*
177 * parse a single quoted string argument from the command line
178 */
179 static void parse_single_quote(struct uci_context *ctx, char **str, char **target)
180 {
181 char c;
182 /* skip quote character */
183 *str += 1;
184
185 while ((c = **str)) {
186 switch(c) {
187 case '\'':
188 **target = 0;
189 *str += 1;
190 return;
191 default:
192 addc(target, str);
193 }
194 }
195 uci_parse_error(ctx, *str, "unterminated '");
196 }
197
198 /*
199 * parse a string from the command line and detect the quoting style
200 */
201 static void parse_str(struct uci_context *ctx, char **str, char **target)
202 {
203 do {
204 switch(**str) {
205 case '\'':
206 parse_single_quote(ctx, str, target);
207 break;
208 case '"':
209 parse_double_quote(ctx, str, target);
210 break;
211 case 0:
212 goto done;
213 case '\\':
214 if (!parse_backslash(ctx, str))
215 continue;
216 /* fall through */
217 default:
218 addc(target, str);
219 break;
220 }
221 } while (**str && !isspace(**str));
222 done:
223
224 /*
225 * if the string was unquoted and we've stopped at a whitespace
226 * character, skip to the next one, because the whitespace will
227 * be overwritten by a null byte here
228 */
229 if (**str)
230 *str += 1;
231
232 /* terminate the parsed string */
233 **target = 0;
234 }
235
236 /*
237 * extract the next argument from the command line
238 */
239 static char *next_arg(struct uci_context *ctx, char **str, bool required, bool name)
240 {
241 char *val;
242 char *ptr;
243
244 val = ptr = *str;
245 skip_whitespace(ctx, str);
246 parse_str(ctx, str, &ptr);
247 if (!*val) {
248 if (required)
249 uci_parse_error(ctx, *str, "insufficient arguments");
250 goto done;
251 }
252
253 if (name && !uci_validate_name(val))
254 uci_parse_error(ctx, val, "invalid character in field");
255
256 done:
257 return val;
258 }
259
260 /*
261 * verify that the end of the line or command is reached.
262 * throw an error if extra arguments are given on the command line
263 */
264 static void assert_eol(struct uci_context *ctx, char **str)
265 {
266 char *tmp;
267
268 tmp = next_arg(ctx, str, false, false);
269 if (tmp && *tmp)
270 uci_parse_error(ctx, *str, "too many arguments");
271 }
272
273 /*
274 * switch to a different config, either triggered by uci_load, or by a
275 * 'package <...>' statement in the import file
276 */
277 static void uci_switch_config(struct uci_context *ctx)
278 {
279 struct uci_parse_context *pctx;
280 struct uci_element *e;
281 const char *name;
282
283 pctx = ctx->pctx;
284 name = pctx->name;
285
286 /* add the last config to main config file list */
287 if (pctx->package) {
288 uci_list_add(&ctx->root, &pctx->package->e.list);
289
290 pctx->package = NULL;
291 pctx->section = NULL;
292 }
293
294 if (!name)
295 return;
296
297 /*
298 * if an older config under the same name exists, unload it
299 * ignore errors here, e.g. if the config was not found
300 */
301 e = uci_lookup_list(ctx, &ctx->root, name);
302 if (e)
303 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
304 pctx->package = uci_alloc_package(ctx, name);
305 }
306
307 /*
308 * parse the 'package' uci command (next config package)
309 */
310 static void uci_parse_package(struct uci_context *ctx, char **str, bool single)
311 {
312 char *name = NULL;
313
314 /* command string null-terminated by strtok */
315 *str += strlen(*str) + 1;
316
317 name = next_arg(ctx, str, true, true);
318 assert_eol(ctx, str);
319 if (single)
320 return;
321
322 ctx->pctx->name = name;
323 uci_switch_config(ctx);
324 }
325
326 /* Based on an efficient hash function published by D. J. Bernstein */
327 static unsigned int djbhash(unsigned int hash, char *str)
328 {
329 int len = strlen(str);
330 int i;
331
332 /* initial value */
333 if (hash == ~0)
334 hash = 5381;
335
336 for(i = 0; i < len; i++) {
337 hash = ((hash << 5) + hash) + str[i];
338 }
339 return (hash & 0x7FFFFFFF);
340 }
341
342 /* fix up an unnamed section */
343 static void uci_fixup_section(struct uci_context *ctx, struct uci_section *s)
344 {
345 unsigned int hash = ~0;
346 struct uci_element *e;
347 char buf[16];
348
349 if (!s || s->e.name)
350 return;
351
352 /*
353 * Generate a name for unnamed sections. This is used as reference
354 * when locating or updating the section from apps/scripts.
355 * To make multiple concurrent versions somewhat safe for updating,
356 * the name is generated from a hash of its type and name/value
357 * pairs of its option, and it is prefixed by a counter value.
358 * If the order of the unnamed sections changes for some reason,
359 * updates to them will be rejected.
360 */
361 hash = djbhash(hash, s->type);
362 uci_foreach_element(&s->options, e) {
363 hash = djbhash(hash, e->name);
364 hash = djbhash(hash, uci_to_option(e)->value);
365 }
366 sprintf(buf, "cfg%02x%04x", ++s->package->n_section, hash % (1 << 16));
367 s->e.name = uci_strdup(ctx, buf);
368 }
369
370 /*
371 * parse the 'config' uci command (open a section)
372 */
373 static void uci_parse_config(struct uci_context *ctx, char **str)
374 {
375 struct uci_parse_context *pctx = ctx->pctx;
376 char *name = NULL;
377 char *type = NULL;
378
379 uci_fixup_section(ctx, ctx->pctx->section);
380 if (!ctx->pctx->package) {
381 if (!ctx->pctx->name)
382 uci_parse_error(ctx, *str, "attempting to import a file without a package name");
383
384 uci_switch_config(ctx);
385 }
386
387 /* command string null-terminated by strtok */
388 *str += strlen(*str) + 1;
389
390 type = next_arg(ctx, str, true, true);
391 name = next_arg(ctx, str, false, true);
392 assert_eol(ctx, str);
393
394 if (pctx->merge) {
395 UCI_TRAP_SAVE(ctx, error);
396 uci_set(ctx, pctx->package, name, NULL, type);
397 UCI_TRAP_RESTORE(ctx);
398 return;
399 error:
400 UCI_THROW(ctx, ctx->errno);
401 } else
402 pctx->section = uci_alloc_section(pctx->package, type, name);
403 }
404
405 /*
406 * parse the 'option' uci command (open a value)
407 */
408 static void uci_parse_option(struct uci_context *ctx, char **str)
409 {
410 struct uci_parse_context *pctx = ctx->pctx;
411 char *name = NULL;
412 char *value = NULL;
413
414 if (!pctx->section)
415 uci_parse_error(ctx, *str, "option command found before the first section");
416
417 /* command string null-terminated by strtok */
418 *str += strlen(*str) + 1;
419
420 name = next_arg(ctx, str, true, true);
421 value = next_arg(ctx, str, true, false);
422 assert_eol(ctx, str);
423
424 if (pctx->merge) {
425 UCI_TRAP_SAVE(ctx, error);
426 uci_set(ctx, pctx->package, pctx->section->e.name, name, value);
427 UCI_TRAP_RESTORE(ctx);
428 return;
429 error:
430 UCI_THROW(ctx, ctx->errno);
431 } else
432 uci_alloc_option(pctx->section, name, value);
433 }
434
435
436 /*
437 * parse a complete input line, split up combined commands by ';'
438 */
439 static void uci_parse_line(struct uci_context *ctx, bool single)
440 {
441 struct uci_parse_context *pctx = ctx->pctx;
442 char *word, *brk = NULL;
443
444 for (word = strtok_r(pctx->buf, ";", &brk);
445 word;
446 word = strtok_r(NULL, ";", &brk)) {
447
448 char *pbrk = NULL;
449 word = strtok_r(word, " \t", &pbrk);
450
451 switch(word[0]) {
452 case 'p':
453 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
454 uci_parse_package(ctx, &word, single);
455 break;
456 case 'c':
457 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
458 uci_parse_config(ctx, &word);
459 break;
460 case 'o':
461 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
462 uci_parse_option(ctx, &word);
463 break;
464 default:
465 uci_parse_error(ctx, word, "unterminated command");
466 break;
467 }
468 }
469 }
470
471 /* max number of characters that escaping adds to the string */
472 #define UCI_QUOTE_ESCAPE "'\\''"
473
474 /*
475 * escape an uci string for export
476 */
477 static char *uci_escape(struct uci_context *ctx, char *str)
478 {
479 char *s, *p;
480 int pos = 0;
481
482 if (!ctx->buf) {
483 ctx->bufsz = LINEBUF;
484 ctx->buf = malloc(LINEBUF);
485 }
486
487 s = str;
488 p = strchr(str, '\'');
489 if (!p)
490 return str;
491
492 do {
493 int len = p - s;
494 if (len > 0) {
495 if (p + sizeof(UCI_QUOTE_ESCAPE) - str >= ctx->bufsz) {
496 ctx->bufsz *= 2;
497 ctx->buf = realloc(ctx->buf, ctx->bufsz);
498 if (!ctx->buf)
499 UCI_THROW(ctx, UCI_ERR_MEM);
500 }
501 memcpy(&ctx->buf[pos], s, len);
502 pos += len;
503 }
504 strcpy(&ctx->buf[pos], UCI_QUOTE_ESCAPE);
505 pos += sizeof(UCI_QUOTE_ESCAPE);
506 s = p + 1;
507 } while ((p = strchr(s, '\'')));
508
509 return ctx->buf;
510 }
511
512
513 /*
514 * export a single config package to a file stream
515 */
516 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
517 {
518 struct uci_context *ctx = p->ctx;
519 struct uci_element *s, *o;
520
521 if (header)
522 fprintf(stream, "package '%s'\n", uci_escape(ctx, p->e.name));
523 uci_foreach_element(&p->sections, s) {
524 struct uci_section *sec = uci_to_section(s);
525 fprintf(stream, "\nconfig '%s'", uci_escape(ctx, sec->type));
526 if (!sec->anonymous)
527 fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
528 fprintf(stream, "\n");
529 uci_foreach_element(&sec->options, o) {
530 struct uci_option *opt = uci_to_option(o);
531 fprintf(stream, "\toption '%s'", uci_escape(ctx, opt->e.name));
532 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->value));
533 }
534 }
535 fprintf(stream, "\n");
536 }
537
538 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
539 {
540 struct uci_element *e;
541
542 UCI_HANDLE_ERR(ctx);
543 UCI_ASSERT(ctx, stream != NULL);
544
545 if (package)
546 uci_export_package(package, stream, header);
547 else {
548 uci_foreach_element(&ctx->root, e) {
549 uci_export_package(uci_to_package(e), stream, header);
550 }
551 }
552
553 return 0;
554 }
555
556 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
557 {
558 struct uci_parse_context *pctx;
559 UCI_HANDLE_ERR(ctx);
560
561 /* make sure no memory from previous parse attempts is leaked */
562 uci_file_cleanup(ctx);
563
564 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
565 ctx->pctx = pctx;
566 pctx->file = stream;
567 if (*package && single) {
568 pctx->package = *package;
569 pctx->merge = true;
570 }
571
572 /*
573 * If 'name' was supplied, assume that the supplied stream does not contain
574 * the appropriate 'package <name>' string to specify the config name
575 * NB: the config file can still override the package name
576 */
577 if (name)
578 pctx->name = name;
579
580 while (!feof(pctx->file)) {
581 uci_getln(ctx, 0);
582 UCI_TRAP_SAVE(ctx, error);
583 if (pctx->buf[0])
584 uci_parse_line(ctx, single);
585 UCI_TRAP_RESTORE(ctx);
586 continue;
587 error:
588 if (ctx->flags & UCI_FLAG_PERROR)
589 uci_perror(ctx, NULL);
590 if ((ctx->errno != UCI_ERR_PARSE) ||
591 (ctx->flags & UCI_FLAG_STRICT))
592 UCI_THROW(ctx, ctx->errno);
593 }
594
595 uci_fixup_section(ctx, ctx->pctx->section);
596 if (package)
597 *package = pctx->package;
598 if (pctx->merge)
599 pctx->package = NULL;
600
601 pctx->name = NULL;
602 uci_switch_config(ctx);
603
604 /* no error happened, we can get rid of the parser context now */
605 uci_file_cleanup(ctx);
606
607 return 0;
608 }
609
610 /*
611 * open a stream and go to the right position
612 *
613 * note: when opening for write and seeking to the beginning of
614 * the stream, truncate the file
615 */
616 static FILE *uci_open_stream(struct uci_context *ctx, const char *filename, int pos, bool write, bool create)
617 {
618 struct stat statbuf;
619 FILE *file = NULL;
620 int fd, ret;
621 int mode = (write ? O_RDWR : O_RDONLY);
622
623 if (create)
624 mode |= O_CREAT;
625
626 if (!write && ((stat(filename, &statbuf) < 0) ||
627 ((statbuf.st_mode & S_IFMT) != S_IFREG))) {
628 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
629 }
630
631 fd = open(filename, mode, UCI_FILEMODE);
632 if (fd <= 0)
633 goto error;
634
635 if (flock(fd, (write ? LOCK_EX : LOCK_SH)) < 0)
636 goto error;
637
638 ret = lseek(fd, 0, pos);
639
640 if (ret < 0)
641 goto error;
642
643 file = fdopen(fd, (write ? "w+" : "r"));
644 if (file)
645 goto done;
646
647 error:
648 UCI_THROW(ctx, UCI_ERR_IO);
649 done:
650 return file;
651 }
652
653 static void uci_close_stream(FILE *stream)
654 {
655 int fd;
656
657 if (!stream)
658 return;
659
660 fd = fileno(stream);
661 flock(fd, LOCK_UN);
662 fclose(stream);
663 }
664
665 static void uci_parse_history_line(struct uci_context *ctx, struct uci_package *p, char *buf)
666 {
667 bool delete = false;
668 bool rename = false;
669 char *package = NULL;
670 char *section = NULL;
671 char *option = NULL;
672 char *value = NULL;
673
674 if (buf[0] == '-') {
675 delete = true;
676 buf++;
677 } else if (buf[0] == '@') {
678 rename = true;
679 buf++;
680 }
681
682 UCI_INTERNAL(uci_parse_tuple, ctx, buf, &package, &section, &option, &value);
683 if (!package || !section || (!delete && !value))
684 goto error;
685 if (strcmp(package, p->e.name) != 0)
686 goto error;
687 if (!uci_validate_name(section))
688 goto error;
689 if (option && !uci_validate_name(option))
690 goto error;
691
692 if (rename)
693 UCI_INTERNAL(uci_rename, ctx, p, section, option, value);
694 else if (delete)
695 UCI_INTERNAL(uci_delete, ctx, p, section, option);
696 else
697 UCI_INTERNAL(uci_set, ctx, p, section, option, value);
698
699 return;
700 error:
701 UCI_THROW(ctx, UCI_ERR_PARSE);
702 }
703
704 static void uci_parse_history(struct uci_context *ctx, FILE *stream, struct uci_package *p)
705 {
706 struct uci_parse_context *pctx;
707
708 /* make sure no memory from previous parse attempts is leaked */
709 uci_file_cleanup(ctx);
710
711 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
712 ctx->pctx = pctx;
713 pctx->file = stream;
714
715 while (!feof(pctx->file)) {
716 uci_getln(ctx, 0);
717 if (!pctx->buf[0])
718 continue;
719
720 /*
721 * ignore parse errors in single lines, we want to preserve as much
722 * history as possible
723 */
724 UCI_TRAP_SAVE(ctx, error);
725 uci_parse_history_line(ctx, p, pctx->buf);
726 UCI_TRAP_RESTORE(ctx);
727 error:
728 continue;
729 }
730
731 /* no error happened, we can get rid of the parser context now */
732 uci_file_cleanup(ctx);
733 }
734
735 static void uci_load_history(struct uci_context *ctx, struct uci_package *p, bool flush)
736 {
737 char *filename = NULL;
738 FILE *f = NULL;
739
740 if (!p->confdir)
741 return;
742 if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
743 UCI_THROW(ctx, UCI_ERR_MEM);
744
745 UCI_TRAP_SAVE(ctx, done);
746 f = uci_open_stream(ctx, filename, SEEK_SET, flush, false);
747 if (p)
748 uci_parse_history(ctx, f, p);
749 UCI_TRAP_RESTORE(ctx);
750
751 done:
752 if (flush && f) {
753 rewind(f);
754 ftruncate(fileno(f), 0);
755 }
756 if (filename)
757 free(filename);
758 uci_close_stream(f);
759 ctx->errno = 0;
760 }
761
762
763 static char *uci_config_path(struct uci_context *ctx, const char *name)
764 {
765 char *filename;
766
767 if (strchr(name, '/'))
768 UCI_THROW(ctx, UCI_ERR_INVAL);
769 filename = uci_malloc(ctx, strlen(name) + sizeof(UCI_CONFDIR) + 2);
770 sprintf(filename, UCI_CONFDIR "/%s", name);
771
772 return filename;
773 }
774
775 int uci_load(struct uci_context *ctx, const char *name, struct uci_package **package)
776 {
777 char *filename;
778 bool confdir;
779 FILE *file = NULL;
780
781 UCI_HANDLE_ERR(ctx);
782 UCI_ASSERT(ctx, uci_validate_name(name));
783
784 switch (name[0]) {
785 case '.':
786 /* relative path outside of /etc/config */
787 if (name[1] != '/')
788 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
789 /* fall through */
790 case '/':
791 /* absolute path outside of /etc/config */
792 filename = uci_strdup(ctx, name);
793 name = strrchr(name, '/') + 1;
794 confdir = false;
795 break;
796 default:
797 /* config in /etc/config */
798 filename = uci_config_path(ctx, name);
799 confdir = true;
800 break;
801 }
802
803 file = uci_open_stream(ctx, filename, SEEK_SET, false, false);
804 ctx->errno = 0;
805 UCI_TRAP_SAVE(ctx, done);
806 UCI_INTERNAL(uci_import, ctx, file, name, package, true);
807 UCI_TRAP_RESTORE(ctx);
808
809 if (*package) {
810 (*package)->path = filename;
811 (*package)->confdir = confdir;
812 uci_load_history(ctx, *package, false);
813 }
814
815 done:
816 uci_close_stream(file);
817 return ctx->errno;
818 }
819
820 int uci_save(struct uci_context *ctx, struct uci_package *p)
821 {
822 FILE *f = NULL;
823 char *filename = NULL;
824 struct uci_element *e, *tmp;
825
826 UCI_HANDLE_ERR(ctx);
827 UCI_ASSERT(ctx, p != NULL);
828
829 /*
830 * if the config file was outside of the /etc/config path,
831 * don't save the history to a file, update the real file
832 * directly.
833 * does not modify the uci_package pointer
834 */
835 if (!p->confdir)
836 return uci_commit(ctx, &p, false);
837
838 if (uci_list_empty(&p->history))
839 return 0;
840
841 if ((asprintf(&filename, "%s/%s", UCI_SAVEDIR, p->e.name) < 0) || !filename)
842 UCI_THROW(ctx, UCI_ERR_MEM);
843
844 ctx->errno = 0;
845 UCI_TRAP_SAVE(ctx, done);
846 f = uci_open_stream(ctx, filename, SEEK_END, true, true);
847 UCI_TRAP_RESTORE(ctx);
848
849 uci_foreach_element_safe(&p->history, tmp, e) {
850 struct uci_history *h = uci_to_history(e);
851
852 if (h->cmd == UCI_CMD_REMOVE)
853 fprintf(f, "-");
854 else if (h->cmd == UCI_CMD_RENAME)
855 fprintf(f, "@");
856
857 fprintf(f, "%s.%s", p->e.name, h->section);
858 if (e->name)
859 fprintf(f, ".%s", e->name);
860
861 if (h->cmd == UCI_CMD_REMOVE)
862 fprintf(f, "\n");
863 else
864 fprintf(f, "=%s\n", h->value);
865 uci_free_history(h);
866 }
867
868 done:
869 uci_close_stream(f);
870 if (filename)
871 free(filename);
872 if (ctx->errno)
873 UCI_THROW(ctx, ctx->errno);
874
875 return 0;
876 }
877
878 int uci_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
879 {
880 struct uci_package *p;
881 FILE *f = NULL;
882 char *name = NULL;
883 char *path = NULL;
884
885 UCI_HANDLE_ERR(ctx);
886 UCI_ASSERT(ctx, package != NULL);
887 p = *package;
888
889 UCI_ASSERT(ctx, p != NULL);
890 if (!p->path) {
891 if (overwrite)
892 p->path = uci_config_path(ctx, p->e.name);
893 else
894 UCI_THROW(ctx, UCI_ERR_INVAL);
895 }
896
897
898 /* open the config file for writing now, so that it is locked */
899 f = uci_open_stream(ctx, p->path, SEEK_SET, true, true);
900
901 /* flush unsaved changes and reload from history file */
902 UCI_TRAP_SAVE(ctx, done);
903 if (p->confdir) {
904 if (!overwrite) {
905 name = uci_strdup(ctx, p->e.name);
906 path = uci_strdup(ctx, p->path);
907 if (!uci_list_empty(&p->history))
908 UCI_INTERNAL(uci_save, ctx, p);
909 uci_free_package(&p);
910 uci_file_cleanup(ctx);
911 UCI_INTERNAL(uci_import, ctx, f, name, &p, true);
912
913 p->path = path;
914 p->confdir = true;
915 *package = p;
916
917 /* freed together with the uci_package */
918 path = NULL;
919
920 /* check for updated history, just in case */
921 uci_load_history(ctx, p, true);
922 } else {
923 /* flush history */
924 uci_load_history(ctx, NULL, true);
925 }
926 }
927
928 rewind(f);
929 ftruncate(fileno(f), 0);
930
931 uci_export(ctx, f, p, false);
932 UCI_TRAP_RESTORE(ctx);
933
934 done:
935 if (name)
936 free(name);
937 if (path)
938 free(path);
939 uci_close_stream(f);
940 if (ctx->errno)
941 UCI_THROW(ctx, ctx->errno);
942
943 return 0;
944 }
945
946
947 /*
948 * This function returns the filename by returning the string
949 * after the last '/' character. By checking for a non-'\0'
950 * character afterwards, directories are ignored (glob marks
951 * those with a trailing '/'
952 */
953 static inline char *get_filename(char *path)
954 {
955 char *p;
956
957 p = strrchr(path, '/');
958 p++;
959 if (!*p)
960 return NULL;
961 return p;
962 }
963
964 int uci_list_configs(struct uci_context *ctx, char ***list)
965 {
966 char **configs;
967 glob_t globbuf;
968 int size, i;
969 char *buf;
970
971 UCI_HANDLE_ERR(ctx);
972
973 if (glob(UCI_CONFDIR "/*", GLOB_MARK, NULL, &globbuf) != 0)
974 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
975
976 size = sizeof(char *) * (globbuf.gl_pathc + 1);
977 for(i = 0; i < globbuf.gl_pathc; i++) {
978 char *p;
979
980 p = get_filename(globbuf.gl_pathv[i]);
981 if (!p)
982 continue;
983
984 size += strlen(p) + 1;
985 }
986
987 configs = uci_malloc(ctx, size);
988 buf = (char *) &configs[globbuf.gl_pathc + 1];
989 for(i = 0; i < globbuf.gl_pathc; i++) {
990 char *p;
991
992 p = get_filename(globbuf.gl_pathv[i]);
993 if (!p)
994 continue;
995
996 configs[i] = buf;
997 strcpy(buf, p);
998 buf += strlen(buf) + 1;
999 }
1000 *list = configs;
1001
1002 return 0;
1003 }
1004