file: preserve original file mode after commit
[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 Lesser General Public License for more details.
13 */
14
15 /*
16 * This file contains the code for parsing uci config files
17 */
18
19 #define _GNU_SOURCE
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <sys/file.h>
23 #include <stdbool.h>
24 #include <unistd.h>
25 #include <fcntl.h>
26 #include <stdio.h>
27 #include <ctype.h>
28 #include <glob.h>
29 #include <string.h>
30 #include <stdlib.h>
31 #include <errno.h>
32
33 #include "uci.h"
34 #include "uci_internal.h"
35
36 #define LINEBUF 32
37
38 /*
39 * Fetch a new line from the input stream and resize buffer if necessary
40 */
41 __private void uci_getln(struct uci_context *ctx, int offset)
42 {
43 struct uci_parse_context *pctx = ctx->pctx;
44 char *p;
45 int ofs;
46
47 if (pctx->buf == NULL) {
48 pctx->buf = uci_malloc(ctx, LINEBUF);
49 pctx->bufsz = LINEBUF;
50 }
51 /* It takes 2 slots for fgets to read 1 char. */
52 if (offset >= pctx->bufsz - 1) {
53 pctx->bufsz *= 2;
54 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
55 }
56
57 ofs = offset;
58 do {
59 p = &pctx->buf[ofs];
60 p[0] = 0;
61
62 p = fgets(p, pctx->bufsz - ofs, pctx->file);
63 if (!p || !*p)
64 return;
65
66 ofs += strlen(p);
67 if (pctx->buf[ofs - 1] == '\n') {
68 pctx->line++;
69 return;
70 }
71
72 pctx->bufsz *= 2;
73 pctx->buf = uci_realloc(ctx, pctx->buf, pctx->bufsz);
74 } while (1);
75 }
76
77 /*
78 * parse a character escaped by '\'
79 * returns true if the escaped character is to be parsed
80 * returns false if the escaped character is to be ignored
81 */
82 static bool parse_backslash(struct uci_context *ctx)
83 {
84 struct uci_parse_context *pctx = ctx->pctx;
85
86 /* skip backslash */
87 pctx->pos += 1;
88
89 /* undecoded backslash at the end of line, fetch the next line */
90 if (!pctx_cur_char(pctx) ||
91 pctx_cur_char(pctx) == '\n' ||
92 (pctx_cur_char(pctx) == '\r' &&
93 pctx_char(pctx, pctx_pos(pctx) + 1) == '\n' &&
94 !pctx_char(pctx, pctx_pos(pctx) + 2))) {
95 uci_getln(ctx, pctx->pos);
96 return false;
97 }
98
99 /* FIXME: decode escaped char, necessary? */
100 return true;
101 }
102
103 /*
104 * move the string pointer forward until a non-whitespace character or
105 * EOL is reached
106 */
107 static void skip_whitespace(struct uci_context *ctx)
108 {
109 struct uci_parse_context *pctx = ctx->pctx;
110
111 while (pctx_cur_char(pctx) && isspace(pctx_cur_char(pctx)))
112 pctx->pos += 1;
113 }
114
115 static inline void addc(struct uci_context *ctx, int *pos_dest, int *pos_src)
116 {
117 struct uci_parse_context *pctx = ctx->pctx;
118
119 pctx_char(pctx, *pos_dest) = pctx_char(pctx, *pos_src);
120 *pos_dest += 1;
121 *pos_src += 1;
122 }
123
124 /*
125 * parse a double quoted string argument from the command line
126 */
127 static void parse_double_quote(struct uci_context *ctx, int *target)
128 {
129 struct uci_parse_context *pctx = ctx->pctx;
130 char c;
131
132 /* skip quote character */
133 pctx->pos += 1;
134
135 while (1) {
136 c = pctx_cur_char(pctx);
137 switch(c) {
138 case '"':
139 pctx->pos += 1;
140 return;
141 case 0:
142 /* Multi-line str value */
143 uci_getln(ctx, pctx->pos);
144 if (!pctx_cur_char(pctx)) {
145 uci_parse_error(ctx, "EOF with unterminated \"");
146 }
147 break;
148 case '\\':
149 if (!parse_backslash(ctx))
150 continue;
151 /* fall through */
152 default:
153 addc(ctx, target, &pctx->pos);
154 break;
155 }
156 }
157 }
158
159 /*
160 * parse a single quoted string argument from the command line
161 */
162 static void parse_single_quote(struct uci_context *ctx, int *target)
163 {
164 struct uci_parse_context *pctx = ctx->pctx;
165 char c;
166 /* skip quote character */
167 pctx->pos += 1;
168
169 while (1) {
170 c = pctx_cur_char(pctx);
171 switch(c) {
172 case '\'':
173 pctx->pos += 1;
174 return;
175 case 0:
176 /* Multi-line str value */
177 uci_getln(ctx, pctx->pos);
178 if (!pctx_cur_char(pctx))
179 uci_parse_error(ctx, "EOF with unterminated '");
180
181 break;
182 default:
183 addc(ctx, target, &pctx->pos);
184 }
185 }
186 }
187
188 /*
189 * parse a string from the command line and detect the quoting style
190 */
191 static void parse_str(struct uci_context *ctx, int *target)
192 {
193 struct uci_parse_context *pctx = ctx->pctx;
194 bool next = true;
195 do {
196 switch(pctx_cur_char(pctx)) {
197 case '\'':
198 parse_single_quote(ctx, target);
199 break;
200 case '"':
201 parse_double_quote(ctx, target);
202 break;
203 case '#':
204 pctx_cur_char(pctx) = 0;
205 /* fall through */
206 case 0:
207 goto done;
208 case ';':
209 next = false;
210 goto done;
211 case '\\':
212 if (!parse_backslash(ctx))
213 continue;
214 /* fall through */
215 default:
216 addc(ctx, target, &pctx->pos);
217 break;
218 }
219 } while (pctx_cur_char(pctx) && !isspace(pctx_cur_char(pctx)));
220 done:
221
222 /*
223 * if the string was unquoted and we've stopped at a whitespace
224 * character, skip to the next one, because the whitespace will
225 * be overwritten by a null byte here
226 */
227 if (pctx_cur_char(pctx) && next)
228 pctx->pos += 1;
229
230 /* terminate the parsed string */
231 pctx_char(pctx, *target) = 0;
232 }
233
234 /*
235 * extract the next argument from the command line
236 */
237 static int next_arg(struct uci_context *ctx, bool required, bool name, bool package)
238 {
239 struct uci_parse_context *pctx = ctx->pctx;
240 int val, ptr;
241
242 skip_whitespace(ctx);
243 val = ptr = pctx_pos(pctx);
244 if (pctx_cur_char(pctx) == ';') {
245 pctx_cur_char(pctx) = 0;
246 pctx->pos += 1;
247 } else {
248 parse_str(ctx, &ptr);
249 }
250 if (!pctx_char(pctx, val)) {
251 if (required)
252 uci_parse_error(ctx, "insufficient arguments");
253 goto done;
254 }
255
256 if (name && !uci_validate_str(pctx_str(pctx, val), name, package))
257 uci_parse_error(ctx, "invalid character in name field");
258
259 done:
260 return val;
261 }
262
263 int uci_parse_argument(struct uci_context *ctx, FILE *stream, char **str, char **result)
264 {
265 int ofs_result;
266
267 UCI_HANDLE_ERR(ctx);
268 UCI_ASSERT(ctx, str != NULL);
269 UCI_ASSERT(ctx, result != NULL);
270
271 if (ctx->pctx && (ctx->pctx->file != stream))
272 uci_cleanup(ctx);
273
274 if (!ctx->pctx)
275 uci_alloc_parse_context(ctx);
276
277 ctx->pctx->file = stream;
278 if (!*str) {
279 ctx->pctx->pos = 0;
280 uci_getln(ctx, 0);
281 }
282
283 ofs_result = next_arg(ctx, false, false, false);
284 *result = pctx_str(ctx->pctx, ofs_result);
285 *str = pctx_cur_str(ctx->pctx);
286
287 return 0;
288 }
289
290 static int
291 uci_fill_ptr(struct uci_context *ctx, struct uci_ptr *ptr, struct uci_element *e)
292 {
293 UCI_ASSERT(ctx, ptr != NULL);
294 UCI_ASSERT(ctx, e != NULL);
295
296 memset(ptr, 0, sizeof(struct uci_ptr));
297 switch(e->type) {
298 case UCI_TYPE_OPTION:
299 ptr->o = uci_to_option(e);
300 goto fill_option;
301 case UCI_TYPE_SECTION:
302 ptr->s = uci_to_section(e);
303 goto fill_section;
304 case UCI_TYPE_PACKAGE:
305 ptr->p = uci_to_package(e);
306 goto fill_package;
307 default:
308 UCI_THROW(ctx, UCI_ERR_INVAL);
309 }
310
311 fill_option:
312 ptr->option = ptr->o->e.name;
313 ptr->s = ptr->o->section;
314 fill_section:
315 ptr->section = ptr->s->e.name;
316 ptr->p = ptr->s->package;
317 fill_package:
318 ptr->package = ptr->p->e.name;
319
320 ptr->flags |= UCI_LOOKUP_DONE;
321
322 return 0;
323 }
324
325
326
327 /*
328 * verify that the end of the line or command is reached.
329 * throw an error if extra arguments are given on the command line
330 */
331 static void assert_eol(struct uci_context *ctx)
332 {
333 char *tmp;
334 int ofs_tmp;
335
336 skip_whitespace(ctx);
337 ofs_tmp = next_arg(ctx, false, false, false);
338 tmp = pctx_str(ctx->pctx, ofs_tmp);
339 if (*tmp && (ctx->flags & UCI_FLAG_STRICT))
340 uci_parse_error(ctx, "too many arguments");
341 }
342
343 /*
344 * switch to a different config, either triggered by uci_load, or by a
345 * 'package <...>' statement in the import file
346 */
347 static void uci_switch_config(struct uci_context *ctx)
348 {
349 struct uci_parse_context *pctx;
350 struct uci_element *e;
351 const char *name;
352
353 pctx = ctx->pctx;
354 name = pctx->name;
355
356 /* add the last config to main config file list */
357 if (pctx->package) {
358 pctx->package->backend = ctx->backend;
359 uci_list_add(&ctx->root, &pctx->package->e.list);
360
361 pctx->package = NULL;
362 pctx->section = NULL;
363 }
364
365 if (!name)
366 return;
367
368 /*
369 * if an older config under the same name exists, unload it
370 * ignore errors here, e.g. if the config was not found
371 */
372 e = uci_lookup_list(&ctx->root, name);
373 if (e)
374 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
375 pctx->package = uci_alloc_package(ctx, name);
376 }
377
378 /*
379 * parse the 'package' uci command (next config package)
380 */
381 static void uci_parse_package(struct uci_context *ctx, bool single)
382 {
383 struct uci_parse_context *pctx = ctx->pctx;
384 int ofs_name;
385 char *name;
386
387 /* command string null-terminated by strtok */
388 pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
389
390 ofs_name = next_arg(ctx, true, true, true);
391 name = pctx_str(pctx, ofs_name);
392 assert_eol(ctx);
393 if (single)
394 return;
395
396 ctx->pctx->name = name;
397 uci_switch_config(ctx);
398 }
399
400 /*
401 * parse the 'config' uci command (open a section)
402 */
403 static void uci_parse_config(struct uci_context *ctx)
404 {
405 struct uci_parse_context *pctx = ctx->pctx;
406 struct uci_element *e;
407 struct uci_ptr ptr;
408 int ofs_name, ofs_type;
409 char *name;
410 char *type;
411
412 if (!ctx->pctx->package) {
413 if (!ctx->pctx->name)
414 uci_parse_error(ctx, "attempting to import a file without a package name");
415
416 uci_switch_config(ctx);
417 }
418
419 /* command string null-terminated by strtok */
420 pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
421
422 ofs_type = next_arg(ctx, true, false, false);
423 type = pctx_str(pctx, ofs_type);
424 if (!uci_validate_type(type))
425 uci_parse_error(ctx, "invalid character in type field");
426
427 ofs_name = next_arg(ctx, false, true, false);
428 assert_eol(ctx);
429 type = pctx_str(pctx, ofs_type);
430 name = pctx_str(pctx, ofs_name);
431
432 if (!name || !name[0]) {
433 ctx->internal = !pctx->merge;
434 UCI_NESTED(uci_add_section, ctx, pctx->package, type, &pctx->section);
435 } else {
436 uci_fill_ptr(ctx, &ptr, &pctx->package->e);
437 e = uci_lookup_list(&pctx->package->sections, name);
438 if (e) {
439 ptr.s = uci_to_section(e);
440
441 if ((ctx->flags & UCI_FLAG_STRICT) && strcmp(ptr.s->type, type))
442 uci_parse_error(ctx, "section of different type overwrites prior section with same name");
443 }
444
445 ptr.section = name;
446 ptr.value = type;
447
448 ctx->internal = !pctx->merge;
449 UCI_NESTED(uci_set, ctx, &ptr);
450 pctx->section = uci_to_section(ptr.last);
451 }
452 }
453
454 /*
455 * parse the 'option' uci command (open a value)
456 */
457 static void uci_parse_option(struct uci_context *ctx, bool list)
458 {
459 struct uci_parse_context *pctx = ctx->pctx;
460 struct uci_element *e;
461 struct uci_ptr ptr;
462 int ofs_name, ofs_value;
463 char *name = NULL;
464 char *value = NULL;
465
466 if (!pctx->section)
467 uci_parse_error(ctx, "option/list command found before the first section");
468
469 /* command string null-terminated by strtok */
470 pctx->pos += strlen(pctx_cur_str(pctx)) + 1;
471
472 ofs_name = next_arg(ctx, true, true, false);
473 ofs_value = next_arg(ctx, false, false, false);
474 assert_eol(ctx);
475 name = pctx_str(pctx, ofs_name);
476 value = pctx_str(pctx, ofs_value);
477
478 uci_fill_ptr(ctx, &ptr, &pctx->section->e);
479 e = uci_lookup_list(&pctx->section->options, name);
480 if (e)
481 ptr.o = uci_to_option(e);
482 ptr.option = name;
483 ptr.value = value;
484
485 ctx->internal = !pctx->merge;
486 if (list)
487 UCI_NESTED(uci_add_list, ctx, &ptr);
488 else
489 UCI_NESTED(uci_set, ctx, &ptr);
490 }
491
492 /*
493 * parse a complete input line, split up combined commands by ';'
494 */
495 static void uci_parse_line(struct uci_context *ctx, bool single)
496 {
497 struct uci_parse_context *pctx = ctx->pctx;
498 char *word;
499
500 /* Skip whitespace characters at the start of line */
501 skip_whitespace(ctx);
502 do {
503 word = strtok(pctx_cur_str(pctx), " \t");
504 if (!word)
505 return;
506
507 switch(word[0]) {
508 case 0:
509 case '#':
510 return;
511 case 'p':
512 if ((word[1] == 0) || !strcmp(word + 1, "ackage"))
513 uci_parse_package(ctx, single);
514 else
515 goto invalid;
516 break;
517 case 'c':
518 if ((word[1] == 0) || !strcmp(word + 1, "onfig"))
519 uci_parse_config(ctx);
520 else
521 goto invalid;
522 break;
523 case 'o':
524 if ((word[1] == 0) || !strcmp(word + 1, "ption"))
525 uci_parse_option(ctx, false);
526 else
527 goto invalid;
528 break;
529 case 'l':
530 if ((word[1] == 0) || !strcmp(word + 1, "ist"))
531 uci_parse_option(ctx, true);
532 else
533 goto invalid;
534 break;
535 default:
536 goto invalid;
537 }
538 continue;
539 invalid:
540 uci_parse_error(ctx, "invalid command");
541 } while (1);
542 }
543
544 /* max number of characters that escaping adds to the string */
545 #define UCI_QUOTE_ESCAPE "'\\''"
546
547 /*
548 * escape an uci string for export
549 */
550 static const char *uci_escape(struct uci_context *ctx, const char *str)
551 {
552 const char *end;
553 int ofs = 0;
554
555 if (!ctx->buf) {
556 ctx->bufsz = LINEBUF;
557 ctx->buf = malloc(LINEBUF);
558
559 if (!ctx->buf)
560 return str;
561 }
562
563 while (1) {
564 int len;
565
566 end = strchr(str, '\'');
567 if (!end)
568 end = str + strlen(str);
569 len = end - str;
570
571 /* make sure that we have enough room in the buffer */
572 while (ofs + len + (int) sizeof(UCI_QUOTE_ESCAPE) + 1 > ctx->bufsz) {
573 ctx->bufsz *= 2;
574 ctx->buf = uci_realloc(ctx, ctx->buf, ctx->bufsz);
575 }
576
577 /* copy the string until the character before the quote */
578 memcpy(&ctx->buf[ofs], str, len);
579 ofs += len;
580
581 /* end of string? return the buffer */
582 if (*end == 0)
583 break;
584
585 memcpy(&ctx->buf[ofs], UCI_QUOTE_ESCAPE, sizeof(UCI_QUOTE_ESCAPE));
586 ofs += strlen(&ctx->buf[ofs]);
587 str = end + 1;
588 }
589
590 ctx->buf[ofs] = 0;
591 return ctx->buf;
592 }
593
594 /*
595 * export a single config package to a file stream
596 */
597 static void uci_export_package(struct uci_package *p, FILE *stream, bool header)
598 {
599 struct uci_context *ctx = p->ctx;
600 struct uci_element *s, *o, *i;
601
602 if (header)
603 fprintf(stream, "package %s\n", uci_escape(ctx, p->e.name));
604 uci_foreach_element(&p->sections, s) {
605 struct uci_section *sec = uci_to_section(s);
606 fprintf(stream, "\nconfig %s", uci_escape(ctx, sec->type));
607 if (!sec->anonymous || (ctx->flags & UCI_FLAG_EXPORT_NAME))
608 fprintf(stream, " '%s'", uci_escape(ctx, sec->e.name));
609 fprintf(stream, "\n");
610 uci_foreach_element(&sec->options, o) {
611 struct uci_option *opt = uci_to_option(o);
612 switch(opt->type) {
613 case UCI_TYPE_STRING:
614 fprintf(stream, "\toption %s", uci_escape(ctx, opt->e.name));
615 fprintf(stream, " '%s'\n", uci_escape(ctx, opt->v.string));
616 break;
617 case UCI_TYPE_LIST:
618 uci_foreach_element(&opt->v.list, i) {
619 fprintf(stream, "\tlist %s", uci_escape(ctx, opt->e.name));
620 fprintf(stream, " '%s'\n", uci_escape(ctx, i->name));
621 }
622 break;
623 default:
624 fprintf(stream, "\t# unknown type for option '%s'\n", uci_escape(ctx, opt->e.name));
625 break;
626 }
627 }
628 }
629 fprintf(stream, "\n");
630 }
631
632 int uci_export(struct uci_context *ctx, FILE *stream, struct uci_package *package, bool header)
633 {
634 struct uci_element *e;
635
636 UCI_HANDLE_ERR(ctx);
637 UCI_ASSERT(ctx, stream != NULL);
638
639 if (package)
640 uci_export_package(package, stream, header);
641 else {
642 uci_foreach_element(&ctx->root, e) {
643 uci_export_package(uci_to_package(e), stream, header);
644 }
645 }
646
647 return 0;
648 }
649
650 int uci_import(struct uci_context *ctx, FILE *stream, const char *name, struct uci_package **package, bool single)
651 {
652 struct uci_parse_context *pctx;
653 UCI_HANDLE_ERR(ctx);
654
655 /* make sure no memory from previous parse attempts is leaked */
656 uci_cleanup(ctx);
657
658 uci_alloc_parse_context(ctx);
659 pctx = ctx->pctx;
660 pctx->file = stream;
661 if (package && *package && single) {
662 pctx->package = *package;
663 pctx->merge = true;
664 }
665
666 /*
667 * If 'name' was supplied, assume that the supplied stream does not contain
668 * the appropriate 'package <name>' string to specify the config name
669 * NB: the config file can still override the package name
670 */
671 if (name) {
672 UCI_ASSERT(ctx, uci_validate_package(name));
673 pctx->name = name;
674 }
675
676 while (!feof(pctx->file)) {
677 pctx->pos = 0;
678 uci_getln(ctx, 0);
679 UCI_TRAP_SAVE(ctx, error);
680 if (pctx->buf[0])
681 uci_parse_line(ctx, single);
682 UCI_TRAP_RESTORE(ctx);
683 continue;
684 error:
685 if (ctx->flags & UCI_FLAG_PERROR)
686 uci_perror(ctx, NULL);
687 if ((ctx->err != UCI_ERR_PARSE) ||
688 (ctx->flags & UCI_FLAG_STRICT))
689 UCI_THROW(ctx, ctx->err);
690 }
691
692 if (!pctx->package && name)
693 uci_switch_config(ctx);
694 if (package)
695 *package = pctx->package;
696 if (pctx->merge)
697 pctx->package = NULL;
698
699 pctx->name = NULL;
700 uci_switch_config(ctx);
701
702 /* no error happened, we can get rid of the parser context now */
703 uci_cleanup(ctx);
704
705 return 0;
706 }
707
708
709 static char *uci_config_path(struct uci_context *ctx, const char *name)
710 {
711 char *filename;
712
713 UCI_ASSERT(ctx, uci_validate_package(name));
714 filename = uci_malloc(ctx, strlen(name) + strlen(ctx->confdir) + 2);
715 sprintf(filename, "%s/%s", ctx->confdir, name);
716
717 return filename;
718 }
719
720 static void uci_file_commit(struct uci_context *ctx, struct uci_package **package, bool overwrite)
721 {
722 struct uci_package *p = *package;
723 FILE *f1, *f2 = NULL;
724 char *volatile name = NULL;
725 char *volatile path = NULL;
726 char *filename = NULL;
727 volatile bool do_rename = false;
728 int fd;
729
730 if (!p->path) {
731 if (overwrite)
732 p->path = uci_config_path(ctx, p->e.name);
733 else
734 UCI_THROW(ctx, UCI_ERR_INVAL);
735 }
736
737 if ((asprintf(&filename, "%s/.%s.uci-XXXXXX", ctx->confdir, p->e.name) < 0) || !filename)
738 UCI_THROW(ctx, UCI_ERR_MEM);
739
740 /* open the config file for writing now, so that it is locked */
741 f1 = uci_open_stream(ctx, p->path, NULL, SEEK_SET, true, true);
742
743 /* flush unsaved changes and reload from delta file */
744 UCI_TRAP_SAVE(ctx, done);
745 if (p->has_delta) {
746 if (!overwrite) {
747 name = uci_strdup(ctx, p->e.name);
748 path = uci_strdup(ctx, p->path);
749 /* dump our own changes to the delta file */
750 if (!uci_list_empty(&p->delta))
751 UCI_INTERNAL(uci_save, ctx, p);
752
753 /*
754 * other processes might have modified the config
755 * as well. dump and reload
756 */
757 uci_free_package(&p);
758 uci_cleanup(ctx);
759 UCI_INTERNAL(uci_import, ctx, f1, name, &p, true);
760
761 p->path = path;
762 p->has_delta = true;
763 *package = p;
764
765 /* freed together with the uci_package */
766 path = NULL;
767 }
768
769 /* flush delta */
770 if (!uci_load_delta(ctx, p, true))
771 goto done;
772 }
773
774 fd = mkstemp(filename);
775 if (fd == -1)
776 UCI_THROW(ctx, UCI_ERR_IO);
777
778 if ((flock(fd, LOCK_EX) < 0) && (errno != ENOSYS))
779 UCI_THROW(ctx, UCI_ERR_IO);
780
781 if (lseek(fd, 0, SEEK_SET) < 0)
782 UCI_THROW(ctx, UCI_ERR_IO);
783
784 f2 = fdopen(fd, "w+");
785 if (!f2)
786 UCI_THROW(ctx, UCI_ERR_IO);
787
788 uci_export(ctx, f2, p, false);
789
790 fflush(f2);
791 fsync(fileno(f2));
792 uci_close_stream(f2);
793
794 do_rename = true;
795
796 UCI_TRAP_RESTORE(ctx);
797
798 done:
799 free(name);
800 free(path);
801 uci_close_stream(f1);
802 if (do_rename) {
803 path = realpath(p->path, NULL);
804 if (!path || rename(filename, path)) {
805 unlink(filename);
806 UCI_THROW(ctx, UCI_ERR_IO);
807 }
808 free(path);
809 }
810 free(filename);
811 if (ctx->err)
812 UCI_THROW(ctx, ctx->err);
813 }
814
815
816 /*
817 * This function returns the filename by returning the string
818 * after the last '/' character. By checking for a non-'\0'
819 * character afterwards, directories are ignored (glob marks
820 * those with a trailing '/'
821 */
822 static inline char *get_filename(char *path)
823 {
824 char *p;
825
826 p = strrchr(path, '/');
827 p++;
828 if (!*p)
829 return NULL;
830 return p;
831 }
832
833 static char **uci_list_config_files(struct uci_context *ctx)
834 {
835 char **configs;
836 glob_t globbuf;
837 int size, j, skipped;
838 size_t i;
839 char *buf;
840 char *dir;
841
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) {
845 free(dir);
846 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
847 }
848
849 size = sizeof(char *) * (globbuf.gl_pathc + 1);
850 skipped = 0;
851 for(i = 0; i < globbuf.gl_pathc; i++) {
852 char *p;
853
854 p = get_filename(globbuf.gl_pathv[i]);
855 if (!p) {
856 skipped++;
857 continue;
858 }
859
860 size += strlen(p) + 1;
861 }
862
863 configs = uci_malloc(ctx, size - skipped);
864 buf = (char *) &configs[globbuf.gl_pathc + 1 - skipped];
865 j = 0;
866 for(i = 0; i < globbuf.gl_pathc; i++) {
867 char *p;
868
869 p = get_filename(globbuf.gl_pathv[i]);
870 if (!p)
871 continue;
872
873 if (!uci_validate_package(p))
874 continue;
875
876 configs[j++] = buf;
877 strcpy(buf, p);
878 buf += strlen(buf) + 1;
879 }
880 free(dir);
881 globfree(&globbuf);
882 return configs;
883 }
884
885 static struct uci_package *uci_file_load(struct uci_context *ctx,
886 const char *volatile name)
887 {
888 struct uci_package *package = NULL;
889 char *filename;
890 bool confdir;
891 FILE *volatile file = NULL;
892
893 switch (name[0]) {
894 case '.':
895 /* relative path outside of /etc/config */
896 if (name[1] != '/')
897 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
898 /* fall through */
899 case '/':
900 /* absolute path outside of /etc/config */
901 filename = uci_strdup(ctx, name);
902 name = strrchr(name, '/') + 1;
903 confdir = false;
904 break;
905 default:
906 /* config in /etc/config */
907 filename = uci_config_path(ctx, name);
908 confdir = true;
909 break;
910 }
911
912 UCI_TRAP_SAVE(ctx, done);
913 file = uci_open_stream(ctx, filename, NULL, SEEK_SET, false, false);
914 ctx->err = 0;
915 UCI_INTERNAL(uci_import, ctx, file, name, &package, true);
916 UCI_TRAP_RESTORE(ctx);
917
918 if (package) {
919 package->path = filename;
920 package->has_delta = confdir;
921 uci_load_delta(ctx, package, false);
922 }
923
924 done:
925 uci_close_stream(file);
926 if (ctx->err) {
927 free(filename);
928 UCI_THROW(ctx, ctx->err);
929 }
930 return package;
931 }
932
933 __private UCI_BACKEND(uci_file_backend, "file",
934 .load = uci_file_load,
935 .commit = uci_file_commit,
936 .list_configs = uci_list_config_files,
937 );