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uci: expose rpc_uci_purge_savedirs() helper
[project/rpcd.git] / uci.c
1 /*
2 * rpcd - UBUS RPC server
3 *
4 * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <rpcd/uci.h>
20 #include <rpcd/session.h>
21
22 static struct blob_buf buf;
23 static struct uci_context *cursor;
24
25 enum {
26 RPC_G_CONFIG,
27 RPC_G_SECTION,
28 RPC_G_OPTION,
29 RPC_G_TYPE,
30 RPC_G_MATCH,
31 RPC_G_SESSION,
32 __RPC_G_MAX,
33 };
34
35 static const struct blobmsg_policy rpc_uci_get_policy[__RPC_G_MAX] = {
36 [RPC_G_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
37 [RPC_G_SECTION] = { .name = "section", .type = BLOBMSG_TYPE_STRING },
38 [RPC_G_OPTION] = { .name = "option", .type = BLOBMSG_TYPE_STRING },
39 [RPC_G_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
40 [RPC_G_MATCH] = { .name = "match", .type = BLOBMSG_TYPE_TABLE },
41 [RPC_G_SESSION] = { .name = "ubus_rpc_session",
42 .type = BLOBMSG_TYPE_STRING },
43 };
44
45 enum {
46 RPC_A_CONFIG,
47 RPC_A_TYPE,
48 RPC_A_NAME,
49 RPC_A_VALUES,
50 RPC_A_SESSION,
51 __RPC_A_MAX,
52 };
53
54 static const struct blobmsg_policy rpc_uci_add_policy[__RPC_A_MAX] = {
55 [RPC_A_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
56 [RPC_A_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
57 [RPC_A_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
58 [RPC_A_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
59 [RPC_A_SESSION] = { .name = "ubus_rpc_session",
60 .type = BLOBMSG_TYPE_STRING },
61 };
62
63 enum {
64 RPC_S_CONFIG,
65 RPC_S_SECTION,
66 RPC_S_TYPE,
67 RPC_S_MATCH,
68 RPC_S_VALUES,
69 RPC_S_SESSION,
70 __RPC_S_MAX,
71 };
72
73 static const struct blobmsg_policy rpc_uci_set_policy[__RPC_S_MAX] = {
74 [RPC_S_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
75 [RPC_S_SECTION] = { .name = "section", .type = BLOBMSG_TYPE_STRING },
76 [RPC_S_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
77 [RPC_S_MATCH] = { .name = "match", .type = BLOBMSG_TYPE_TABLE },
78 [RPC_S_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
79 [RPC_S_SESSION] = { .name = "ubus_rpc_session",
80 .type = BLOBMSG_TYPE_STRING },
81 };
82
83 enum {
84 RPC_D_CONFIG,
85 RPC_D_SECTION,
86 RPC_D_TYPE,
87 RPC_D_MATCH,
88 RPC_D_OPTION,
89 RPC_D_OPTIONS,
90 RPC_D_SESSION,
91 __RPC_D_MAX,
92 };
93
94 static const struct blobmsg_policy rpc_uci_delete_policy[__RPC_D_MAX] = {
95 [RPC_D_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
96 [RPC_D_SECTION] = { .name = "section", .type = BLOBMSG_TYPE_STRING },
97 [RPC_D_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
98 [RPC_D_MATCH] = { .name = "match", .type = BLOBMSG_TYPE_TABLE },
99 [RPC_D_OPTION] = { .name = "option", .type = BLOBMSG_TYPE_STRING },
100 [RPC_D_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_ARRAY },
101 [RPC_D_SESSION] = { .name = "ubus_rpc_session",
102 .type = BLOBMSG_TYPE_STRING },
103 };
104
105 enum {
106 RPC_R_CONFIG,
107 RPC_R_SECTION,
108 RPC_R_OPTION,
109 RPC_R_NAME,
110 RPC_R_SESSION,
111 __RPC_R_MAX,
112 };
113
114 static const struct blobmsg_policy rpc_uci_rename_policy[__RPC_R_MAX] = {
115 [RPC_R_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
116 [RPC_R_SECTION] = { .name = "section", .type = BLOBMSG_TYPE_STRING },
117 [RPC_R_OPTION] = { .name = "option", .type = BLOBMSG_TYPE_STRING },
118 [RPC_R_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
119 [RPC_R_SESSION] = { .name = "ubus_rpc_session",
120 .type = BLOBMSG_TYPE_STRING },
121 };
122
123 enum {
124 RPC_O_CONFIG,
125 RPC_O_SECTIONS,
126 RPC_O_SESSION,
127 __RPC_O_MAX,
128 };
129
130 static const struct blobmsg_policy rpc_uci_order_policy[__RPC_O_MAX] = {
131 [RPC_O_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
132 [RPC_O_SECTIONS] = { .name = "sections", .type = BLOBMSG_TYPE_ARRAY },
133 [RPC_O_SESSION] = { .name = "ubus_rpc_session",
134 .type = BLOBMSG_TYPE_STRING },
135 };
136
137 enum {
138 RPC_C_CONFIG,
139 RPC_C_SESSION,
140 __RPC_C_MAX,
141 };
142
143 static const struct blobmsg_policy rpc_uci_config_policy[__RPC_C_MAX] = {
144 [RPC_C_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
145 [RPC_C_SESSION] = { .name = "ubus_rpc_session",
146 .type = BLOBMSG_TYPE_STRING },
147 };
148
149 /*
150 * Turn uci error state into ubus return code
151 */
152 static int
153 rpc_uci_status(void)
154 {
155 switch (cursor->err)
156 {
157 case UCI_OK:
158 return UBUS_STATUS_OK;
159
160 case UCI_ERR_INVAL:
161 return UBUS_STATUS_INVALID_ARGUMENT;
162
163 case UCI_ERR_NOTFOUND:
164 return UBUS_STATUS_NOT_FOUND;
165
166 default:
167 return UBUS_STATUS_UNKNOWN_ERROR;
168 }
169 }
170
171 /*
172 * Setup per-session delta save directory. If the passed "sid" blob attribute
173 * pointer is NULL then the precedure was not invoked through the ubus-rpc so
174 * we do not perform session isolation and use the default save directory.
175 */
176 static void
177 rpc_uci_set_savedir(struct blob_attr *sid)
178 {
179 char path[PATH_MAX];
180
181 if (!sid)
182 {
183 uci_set_savedir(cursor, "/tmp/.uci");
184 return;
185 }
186
187 snprintf(path, sizeof(path) - 1,
188 "/tmp/.uci-rpc-%s", (char *)blobmsg_data(sid));
189
190 uci_set_savedir(cursor, path);
191 }
192
193 /*
194 * Test read access to given config. If the passed "sid" blob attribute pointer
195 * is NULL then the precedure was not invoked through the ubus-rpc so we do not
196 * perform access control and always assume true.
197 */
198 static bool
199 rpc_uci_read_access(struct blob_attr *sid, struct blob_attr *config)
200 {
201 rpc_uci_set_savedir(sid);
202
203 if (!sid)
204 return true;
205
206 return rpc_session_access(blobmsg_data(sid), "uci",
207 blobmsg_data(config), "read");
208 }
209
210 /*
211 * Test write access to given config. If the passed "sid" blob attribute pointer
212 * is NULL then the precedure was not invoked through the ubus-rpc so we do not
213 * perform access control and always assume true.
214 */
215 static bool
216 rpc_uci_write_access(struct blob_attr *sid, struct blob_attr *config)
217 {
218 rpc_uci_set_savedir(sid);
219
220 if (!sid)
221 return true;
222
223 return rpc_session_access(blobmsg_data(sid), "uci",
224 blobmsg_data(config), "write");
225 }
226
227 /*
228 * Format applicable blob value as string and place a pointer to the string
229 * buffer in "p". Uses a static string buffer.
230 */
231 static bool
232 rpc_uci_format_blob(struct blob_attr *v, const char **p)
233 {
234 static char buf[21];
235
236 *p = NULL;
237
238 switch (blobmsg_type(v))
239 {
240 case BLOBMSG_TYPE_STRING:
241 if (blobmsg_data_len(v) > 1)
242 *p = blobmsg_data(v);
243 break;
244
245 case BLOBMSG_TYPE_INT64:
246 snprintf(buf, sizeof(buf), "%"PRIu64, blobmsg_get_u64(v));
247 *p = buf;
248 break;
249
250 case BLOBMSG_TYPE_INT32:
251 snprintf(buf, sizeof(buf), "%u", blobmsg_get_u32(v));
252 *p = buf;
253 break;
254
255 case BLOBMSG_TYPE_INT16:
256 snprintf(buf, sizeof(buf), "%u", blobmsg_get_u16(v));
257 *p = buf;
258 break;
259
260 case BLOBMSG_TYPE_INT8:
261 snprintf(buf, sizeof(buf), "%u", !!blobmsg_get_u8(v));
262 *p = buf;
263 break;
264
265 default:
266 break;
267 }
268
269 return !!*p;
270 }
271
272 /*
273 * Lookup the given uci_ptr and enable extended lookup format if the .section
274 * value of the uci_ptr looks like extended syntax. Uses an internal copy
275 * of the given uci_ptr to perform the lookup as failing extended section
276 * lookup operations in libuci will zero our the uci_ptr struct.
277 * Copies the internal uci_ptr back to given the uci_ptr on success.
278 */
279 static int
280 rpc_uci_lookup(struct uci_ptr *ptr)
281 {
282 int rv;
283 struct uci_ptr lookup = *ptr;
284
285 if (!lookup.s && lookup.section && *lookup.section == '@')
286 lookup.flags |= UCI_LOOKUP_EXTENDED;
287
288 rv = uci_lookup_ptr(cursor, &lookup, NULL, true);
289
290 if (!rv)
291 *ptr = lookup;
292
293 return rv;
294 }
295
296 /*
297 * Checks whether the given uci_option object matches the given string value.
298 * 1) If the uci_option is of type list, check whether any of the list elements
299 * equals to the given string
300 * 2) If the uci_option is of type string, parse it into space separated tokens
301 * and check if any of the tokens equals to the given string.
302 * Returns true if a list element or token matched the given string.
303 */
304 static bool
305 rpc_uci_match_option(struct uci_option *o, const char *cmp)
306 {
307 struct uci_element *e;
308 char *s, *p;
309
310 if (o->type == UCI_TYPE_LIST)
311 {
312 uci_foreach_element(&o->v.list, e)
313 if (e->name && !strcmp(e->name, cmp))
314 return true;
315
316 return false;
317 }
318
319 if (!o->v.string)
320 return false;
321
322 s = strdup(o->v.string);
323
324 if (!s)
325 return false;
326
327 for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
328 {
329 if (!strcmp(p, cmp))
330 {
331 free(s);
332 return true;
333 }
334 }
335
336 free(s);
337 return false;
338 }
339
340 /*
341 * Checks whether the given uci_section matches the type and value blob attrs.
342 * 1) Returns false if "type" is given and the section type does not match
343 * the value specified in the "type" string blob attribute, else continue.
344 * 2) Tests whether any key in the "matches" table blob attribute exists in
345 * the given uci_section and whether each value is contained in the
346 * corresponding uci option value (see rpc_uci_match_option()).
347 * 3) A missing or empty "matches" table blob attribute is always considered
348 * to be a match.
349 * Returns true if "type" matches or is NULL and "matches" matches or is NULL.
350 */
351 static bool
352 rpc_uci_match_section(struct uci_section *s,
353 struct blob_attr *type, struct blob_attr *matches)
354 {
355 struct uci_element *e;
356 struct blob_attr *cur;
357 const char *cmp;
358 bool match = false;
359 bool empty = true;
360 int rem;
361
362 if (type && strcmp(s->type, blobmsg_data(type)))
363 return false;
364
365 if (!matches)
366 return true;
367
368 blobmsg_for_each_attr(cur, matches, rem)
369 {
370 if (!rpc_uci_format_blob(cur, &cmp))
371 continue;
372
373 uci_foreach_element(&s->options, e)
374 {
375 if (strcmp(e->name, blobmsg_name(cur)))
376 continue;
377
378 if (!rpc_uci_match_option(uci_to_option(e), cmp))
379 return false;
380
381 match = true;
382 }
383
384 empty = false;
385 }
386
387 return (empty || match);
388 }
389
390 /*
391 * Dump the given uci_option value into the global blobmsg buffer and use
392 * given "name" as key.
393 * 1) If the uci_option is of type list, put a table into the blob buffer and
394 * add each list item as string to it.
395 * 2) If the uci_option is of type string, put its value directly into the blob
396 * buffer.
397 */
398 static void
399 rpc_uci_dump_option(struct uci_option *o, const char *name)
400 {
401 void *c;
402 struct uci_element *e;
403
404 switch (o->type)
405 {
406 case UCI_TYPE_STRING:
407 blobmsg_add_string(&buf, name, o->v.string);
408 break;
409
410 case UCI_TYPE_LIST:
411 c = blobmsg_open_array(&buf, name);
412
413 uci_foreach_element(&o->v.list, e)
414 blobmsg_add_string(&buf, NULL, e->name);
415
416 blobmsg_close_array(&buf, c);
417 break;
418
419 default:
420 break;
421 }
422 }
423
424 /*
425 * Dump the given uci_section object into the global blobmsg buffer and use
426 * given "name" as key.
427 * Puts a table into the blob buffer and puts each section option member value
428 * as value into the table using the option name as key.
429 * Adds three special keys ".anonymous", ".type" and ".name" which specify the
430 * corresponding section properties.
431 */
432 static void
433 rpc_uci_dump_section(struct uci_section *s, const char *name, int index)
434 {
435 void *c;
436 struct uci_option *o;
437 struct uci_element *e;
438
439 c = blobmsg_open_table(&buf, name);
440
441 blobmsg_add_u8(&buf, ".anonymous", s->anonymous);
442 blobmsg_add_string(&buf, ".type", s->type);
443 blobmsg_add_string(&buf, ".name", s->e.name);
444
445 if (index >= 0)
446 blobmsg_add_u32(&buf, ".index", index);
447
448 uci_foreach_element(&s->options, e)
449 {
450 o = uci_to_option(e);
451 rpc_uci_dump_option(o, o->e.name);
452 }
453
454 blobmsg_close_table(&buf, c);
455 }
456
457 /*
458 * Dump the given uci_package object into the global blobmsg buffer and use
459 * given "name" as key.
460 * Puts a table into the blob buffer and puts each package section member as
461 * value into the table using the section name as key.
462 * Only dumps sections matching the given "type" and "matches", see explaination
463 * of rpc_uci_match_section() for details.
464 */
465 static void
466 rpc_uci_dump_package(struct uci_package *p, const char *name,
467 struct blob_attr *type, struct blob_attr *matches)
468 {
469 void *c;
470 struct uci_element *e;
471 int i = -1;
472
473 c = blobmsg_open_table(&buf, name);
474
475 uci_foreach_element(&p->sections, e)
476 {
477 i++;
478
479 if (!rpc_uci_match_section(uci_to_section(e), type, matches))
480 continue;
481
482 rpc_uci_dump_section(uci_to_section(e), e->name, i);
483 }
484
485 blobmsg_close_table(&buf, c);
486 }
487
488
489 static int
490 rpc_uci_get(struct ubus_context *ctx, struct ubus_object *obj,
491 struct ubus_request_data *req, const char *method,
492 struct blob_attr *msg)
493 {
494 struct blob_attr *tb[__RPC_G_MAX];
495 struct uci_package *p = NULL;
496 struct uci_ptr ptr = { 0 };
497
498 blobmsg_parse(rpc_uci_get_policy, __RPC_G_MAX, tb,
499 blob_data(msg), blob_len(msg));
500
501 if (!tb[RPC_G_CONFIG])
502 return UBUS_STATUS_INVALID_ARGUMENT;
503
504 if (!rpc_uci_read_access(tb[RPC_G_SESSION], tb[RPC_G_CONFIG]))
505 return UBUS_STATUS_PERMISSION_DENIED;
506
507 ptr.package = blobmsg_data(tb[RPC_G_CONFIG]);
508 uci_load(cursor, ptr.package, &p);
509
510 if (!p)
511 goto out;
512
513 if (tb[RPC_G_SECTION])
514 {
515 ptr.section = blobmsg_data(tb[RPC_G_SECTION]);
516
517 if (tb[RPC_G_OPTION])
518 ptr.option = blobmsg_data(tb[RPC_G_OPTION]);
519 }
520
521 if (rpc_uci_lookup(&ptr) || !(ptr.flags & UCI_LOOKUP_COMPLETE))
522 goto out;
523
524 blob_buf_init(&buf, 0);
525
526 switch (ptr.last->type)
527 {
528 case UCI_TYPE_PACKAGE:
529 rpc_uci_dump_package(ptr.p, "values", tb[RPC_G_TYPE], tb[RPC_G_MATCH]);
530 break;
531
532 case UCI_TYPE_SECTION:
533 rpc_uci_dump_section(ptr.s, "values", -1);
534 break;
535
536 case UCI_TYPE_OPTION:
537 rpc_uci_dump_option(ptr.o, "value");
538 break;
539
540 default:
541 break;
542 }
543
544 ubus_send_reply(ctx, req, buf.head);
545
546 out:
547 if (p)
548 uci_unload(cursor, p);
549
550 return rpc_uci_status();
551 }
552
553 static int
554 rpc_uci_add(struct ubus_context *ctx, struct ubus_object *obj,
555 struct ubus_request_data *req, const char *method,
556 struct blob_attr *msg)
557 {
558 struct blob_attr *tb[__RPC_A_MAX];
559 struct blob_attr *cur, *elem;
560 struct uci_package *p = NULL;
561 struct uci_section *s;
562 struct uci_ptr ptr = { 0 };
563 int rem, rem2;
564
565 blobmsg_parse(rpc_uci_add_policy, __RPC_A_MAX, tb,
566 blob_data(msg), blob_len(msg));
567
568 if (!tb[RPC_A_CONFIG] || !tb[RPC_A_TYPE])
569 return UBUS_STATUS_INVALID_ARGUMENT;
570
571 if (!rpc_uci_write_access(tb[RPC_A_SESSION], tb[RPC_A_CONFIG]))
572 return UBUS_STATUS_PERMISSION_DENIED;
573
574 ptr.package = blobmsg_data(tb[RPC_A_CONFIG]);
575
576 uci_load(cursor, ptr.package, &p);
577
578 if (!p)
579 goto out;
580
581 /* add named section */
582 if (tb[RPC_A_NAME])
583 {
584 ptr.section = blobmsg_data(tb[RPC_A_NAME]);
585 ptr.value = blobmsg_data(tb[RPC_A_TYPE]);
586 ptr.option = NULL;
587
588 if (rpc_uci_lookup(&ptr) || uci_set(cursor, &ptr))
589 goto out;
590 }
591
592 /* add anon section */
593 else
594 {
595 if (uci_add_section(cursor, p, blobmsg_data(tb[RPC_A_TYPE]), &s) || !s)
596 goto out;
597
598 ptr.section = s->e.name;
599 }
600
601 if (tb[RPC_A_VALUES])
602 {
603 blobmsg_for_each_attr(cur, tb[RPC_A_VALUES], rem)
604 {
605 ptr.o = NULL;
606 ptr.option = blobmsg_name(cur);
607
608 if (rpc_uci_lookup(&ptr) || !ptr.s)
609 continue;
610
611 switch (blobmsg_type(cur))
612 {
613 case BLOBMSG_TYPE_ARRAY:
614 blobmsg_for_each_attr(elem, cur, rem2)
615 if (rpc_uci_format_blob(elem, &ptr.value))
616 uci_add_list(cursor, &ptr);
617 break;
618
619 default:
620 if (rpc_uci_format_blob(cur, &ptr.value))
621 uci_set(cursor, &ptr);
622 break;
623 }
624 }
625 }
626
627 uci_save(cursor, p);
628
629 blob_buf_init(&buf, 0);
630 blobmsg_add_string(&buf, "section", ptr.section);
631 ubus_send_reply(ctx, req, buf.head);
632
633 out:
634 if (p)
635 uci_unload(cursor, p);
636
637 return rpc_uci_status();
638 }
639
640 /*
641 * Turn value from a blob attribute into uci set operation
642 * 1) if the blob is of type array, delete existing option (if any) and
643 * emit uci add_list operations for each element
644 * 2) if the blob is not an array but an option of type list exists,
645 * delete existing list and emit uci set operation for the blob value
646 * 3) in all other cases only emit a set operation if there is no existing
647 * option of if the existing options value differs from the blob value
648 */
649 static void
650 rpc_uci_merge_set(struct blob_attr *opt, struct uci_ptr *ptr)
651 {
652 struct blob_attr *cur;
653 int rem;
654
655 ptr->o = NULL;
656 ptr->option = blobmsg_name(opt);
657
658 if (rpc_uci_lookup(ptr) || !ptr->s)
659 return;
660
661 if (blobmsg_type(opt) == BLOBMSG_TYPE_ARRAY)
662 {
663 if (ptr->o)
664 uci_delete(cursor, ptr);
665
666 blobmsg_for_each_attr(cur, opt, rem)
667 if (rpc_uci_format_blob(cur, &ptr->value))
668 uci_add_list(cursor, ptr);
669 }
670 else if (ptr->o && ptr->o->type == UCI_TYPE_LIST)
671 {
672 uci_delete(cursor, ptr);
673
674 if (rpc_uci_format_blob(opt, &ptr->value))
675 uci_set(cursor, ptr);
676 }
677 else if (rpc_uci_format_blob(opt, &ptr->value))
678 {
679 if (!ptr->o || !ptr->o->v.string || strcmp(ptr->o->v.string, ptr->value))
680 uci_set(cursor, ptr);
681 }
682 }
683
684 static int
685 rpc_uci_set(struct ubus_context *ctx, struct ubus_object *obj,
686 struct ubus_request_data *req, const char *method,
687 struct blob_attr *msg)
688 {
689 struct blob_attr *tb[__RPC_S_MAX];
690 struct blob_attr *cur;
691 struct uci_package *p = NULL;
692 struct uci_element *e;
693 struct uci_ptr ptr = { 0 };
694 int rem;
695
696 blobmsg_parse(rpc_uci_set_policy, __RPC_S_MAX, tb,
697 blob_data(msg), blob_len(msg));
698
699 if (!tb[RPC_S_CONFIG] || !tb[RPC_S_VALUES] ||
700 (!tb[RPC_S_SECTION] && !tb[RPC_S_TYPE] && !tb[RPC_S_MATCH]))
701 return UBUS_STATUS_INVALID_ARGUMENT;
702
703 if (!rpc_uci_write_access(tb[RPC_S_SESSION], tb[RPC_S_CONFIG]))
704 return UBUS_STATUS_PERMISSION_DENIED;
705
706 ptr.package = blobmsg_data(tb[RPC_S_CONFIG]);
707 uci_load(cursor, ptr.package, &p);
708
709 if (!p)
710 goto out;
711
712 if (tb[RPC_S_SECTION])
713 {
714 ptr.section = blobmsg_data(tb[RPC_S_SECTION]);
715 blobmsg_for_each_attr(cur, tb[RPC_S_VALUES], rem)
716 rpc_uci_merge_set(cur, &ptr);
717 }
718 else
719 {
720 uci_foreach_element(&p->sections, e)
721 {
722 if (!rpc_uci_match_section(uci_to_section(e),
723 tb[RPC_S_TYPE], tb[RPC_S_MATCH]))
724 continue;
725
726 ptr.s = NULL;
727 ptr.section = e->name;
728
729 blobmsg_for_each_attr(cur, tb[RPC_S_VALUES], rem)
730 rpc_uci_merge_set(cur, &ptr);
731 }
732 }
733
734 uci_save(cursor, p);
735
736 out:
737 if (p)
738 uci_unload(cursor, p);
739
740 return rpc_uci_status();
741 }
742
743 /*
744 * Delete option or section from uci specified by given blob attribute pointer
745 * 1) if the blob is of type array, delete any option named after each element
746 * 2) if the blob is of type string, delete the option named after its value
747 * 3) if the blob is NULL, delete entire section
748 */
749 static void
750 rpc_uci_merge_delete(struct blob_attr *opt, struct uci_ptr *ptr)
751 {
752 struct blob_attr *cur;
753 int rem;
754
755 if (rpc_uci_lookup(ptr) || !ptr->s)
756 return;
757
758 if (!opt)
759 {
760 ptr->o = NULL;
761 ptr->option = NULL;
762
763 uci_delete(cursor, ptr);
764 }
765 else if (blobmsg_type(opt) == BLOBMSG_TYPE_ARRAY)
766 {
767 blobmsg_for_each_attr(cur, opt, rem)
768 {
769 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
770 continue;
771
772 ptr->o = NULL;
773 ptr->option = blobmsg_data(cur);
774
775 if (rpc_uci_lookup(ptr) || !ptr->o)
776 continue;
777
778 uci_delete(cursor, ptr);
779 }
780 }
781 else if (blobmsg_type(opt) == BLOBMSG_TYPE_STRING)
782 {
783 ptr->o = NULL;
784 ptr->option = blobmsg_data(opt);
785
786 if (rpc_uci_lookup(ptr) || !ptr->o)
787 return;
788
789 uci_delete(cursor, ptr);
790 }
791 }
792
793 static int
794 rpc_uci_delete(struct ubus_context *ctx, struct ubus_object *obj,
795 struct ubus_request_data *req, const char *method,
796 struct blob_attr *msg)
797 {
798 struct blob_attr *tb[__RPC_D_MAX];
799 struct uci_package *p = NULL;
800 struct uci_element *e, *tmp;
801 struct uci_ptr ptr = { 0 };
802
803 blobmsg_parse(rpc_uci_delete_policy, __RPC_D_MAX, tb,
804 blob_data(msg), blob_len(msg));
805
806 if (!tb[RPC_D_CONFIG] ||
807 (!tb[RPC_D_SECTION] && !tb[RPC_D_TYPE] && !tb[RPC_D_MATCH]))
808 return UBUS_STATUS_INVALID_ARGUMENT;
809
810 if (!rpc_uci_write_access(tb[RPC_D_SESSION], tb[RPC_D_CONFIG]))
811 return UBUS_STATUS_PERMISSION_DENIED;
812
813 ptr.package = blobmsg_data(tb[RPC_D_CONFIG]);
814 uci_load(cursor, ptr.package, &p);
815
816 if (!p)
817 goto out;
818
819 if (tb[RPC_D_SECTION])
820 {
821 ptr.section = blobmsg_data(tb[RPC_D_SECTION]);
822
823 if (tb[RPC_D_OPTIONS])
824 rpc_uci_merge_delete(tb[RPC_D_OPTIONS], &ptr);
825 else
826 rpc_uci_merge_delete(tb[RPC_D_OPTION], &ptr);
827 }
828 else
829 {
830 uci_foreach_element_safe(&p->sections, tmp, e)
831 {
832 if (!rpc_uci_match_section(uci_to_section(e),
833 tb[RPC_D_TYPE], tb[RPC_D_MATCH]))
834 continue;
835
836 ptr.s = NULL;
837 ptr.section = e->name;
838
839 if (tb[RPC_D_OPTIONS])
840 rpc_uci_merge_delete(tb[RPC_D_OPTIONS], &ptr);
841 else
842 rpc_uci_merge_delete(tb[RPC_D_OPTION], &ptr);
843 }
844 }
845
846 uci_save(cursor, p);
847
848 out:
849 if (p)
850 uci_unload(cursor, p);
851
852 return rpc_uci_status();
853 }
854
855 static int
856 rpc_uci_rename(struct ubus_context *ctx, struct ubus_object *obj,
857 struct ubus_request_data *req, const char *method,
858 struct blob_attr *msg)
859 {
860 struct blob_attr *tb[__RPC_R_MAX];
861 struct uci_package *p = NULL;
862 struct uci_ptr ptr = { 0 };
863
864 blobmsg_parse(rpc_uci_rename_policy, __RPC_R_MAX, tb,
865 blob_data(msg), blob_len(msg));
866
867 if (!tb[RPC_R_CONFIG] || !tb[RPC_R_SECTION] || !tb[RPC_R_NAME])
868 return UBUS_STATUS_INVALID_ARGUMENT;
869
870 if (!rpc_uci_write_access(tb[RPC_R_SESSION], tb[RPC_R_CONFIG]))
871 return UBUS_STATUS_PERMISSION_DENIED;
872
873 ptr.package = blobmsg_data(tb[RPC_R_CONFIG]);
874 ptr.section = blobmsg_data(tb[RPC_R_SECTION]);
875 ptr.value = blobmsg_data(tb[RPC_R_NAME]);
876
877 if (tb[RPC_R_OPTION])
878 ptr.option = blobmsg_data(tb[RPC_R_OPTION]);
879
880 uci_load(cursor, ptr.package, &p);
881
882 if (!p)
883 goto out;
884
885 if (uci_lookup_ptr(cursor, &ptr, NULL, true))
886 goto out;
887
888 if ((ptr.option && !ptr.o) || !ptr.s)
889 {
890 cursor->err = UCI_ERR_NOTFOUND;
891 goto out;
892 }
893
894 if (uci_rename(cursor, &ptr))
895 goto out;
896
897 uci_save(cursor, p);
898
899 out:
900 if (p)
901 uci_unload(cursor, p);
902
903 return rpc_uci_status();
904 }
905
906 static int
907 rpc_uci_order(struct ubus_context *ctx, struct ubus_object *obj,
908 struct ubus_request_data *req, const char *method,
909 struct blob_attr *msg)
910 {
911 struct blob_attr *tb[__RPC_O_MAX];
912 struct blob_attr *cur;
913 struct uci_package *p = NULL;
914 struct uci_ptr ptr = { 0 };
915 int rem, i = 1;
916
917 blobmsg_parse(rpc_uci_order_policy, __RPC_O_MAX, tb,
918 blob_data(msg), blob_len(msg));
919
920 if (!tb[RPC_O_CONFIG] || !tb[RPC_O_SECTIONS])
921 return UBUS_STATUS_INVALID_ARGUMENT;
922
923 if (!rpc_uci_write_access(tb[RPC_O_SESSION], tb[RPC_O_CONFIG]))
924 return UBUS_STATUS_PERMISSION_DENIED;
925
926 ptr.package = blobmsg_data(tb[RPC_O_CONFIG]);
927
928 uci_load(cursor, ptr.package, &p);
929
930 if (!p)
931 goto out;
932
933 blobmsg_for_each_attr(cur, tb[RPC_O_SECTIONS], rem)
934 {
935 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
936 continue;
937
938 ptr.s = NULL;
939 ptr.section = blobmsg_data(cur);
940
941 if (uci_lookup_ptr(cursor, &ptr, NULL, true) || !ptr.s)
942 continue;
943
944 uci_reorder_section(cursor, ptr.s, i++);
945 }
946
947 uci_save(cursor, p);
948
949 out:
950 if (p)
951 uci_unload(cursor, p);
952
953 return rpc_uci_status();
954 }
955
956 static void
957 rpc_uci_dump_change(struct uci_delta *d)
958 {
959 void *c;
960 const char *types[] = {
961 [UCI_CMD_REORDER] = "order",
962 [UCI_CMD_REMOVE] = "remove",
963 [UCI_CMD_RENAME] = "rename",
964 [UCI_CMD_ADD] = "add",
965 [UCI_CMD_LIST_ADD] = "list-add",
966 [UCI_CMD_LIST_DEL] = "list-del",
967 [UCI_CMD_CHANGE] = "set",
968 };
969
970 if (!d->section)
971 return;
972
973 c = blobmsg_open_array(&buf, NULL);
974
975 blobmsg_add_string(&buf, NULL, types[d->cmd]);
976 blobmsg_add_string(&buf, NULL, d->section);
977
978 if (d->e.name)
979 blobmsg_add_string(&buf, NULL, d->e.name);
980
981 if (d->value)
982 {
983 if (d->cmd == UCI_CMD_REORDER)
984 blobmsg_add_u32(&buf, NULL, strtoul(d->value, NULL, 10));
985 else
986 blobmsg_add_string(&buf, NULL, d->value);
987 }
988
989 blobmsg_close_array(&buf, c);
990 }
991
992 static int
993 rpc_uci_changes(struct ubus_context *ctx, struct ubus_object *obj,
994 struct ubus_request_data *req, const char *method,
995 struct blob_attr *msg)
996 {
997 struct blob_attr *tb[__RPC_C_MAX];
998 struct uci_package *p = NULL;
999 struct uci_element *e;
1000 void *c;
1001
1002 blobmsg_parse(rpc_uci_config_policy, __RPC_C_MAX, tb,
1003 blob_data(msg), blob_len(msg));
1004
1005 if (!tb[RPC_C_CONFIG])
1006 return UBUS_STATUS_INVALID_ARGUMENT;
1007
1008 if (!rpc_uci_read_access(tb[RPC_C_SESSION], tb[RPC_C_CONFIG]))
1009 return UBUS_STATUS_PERMISSION_DENIED;
1010
1011 uci_load(cursor, blobmsg_data(tb[RPC_C_CONFIG]), &p);
1012
1013 if (!p)
1014 goto out;
1015
1016 blob_buf_init(&buf, 0);
1017 c = blobmsg_open_array(&buf, "changes");
1018
1019 uci_foreach_element(&p->saved_delta, e)
1020 rpc_uci_dump_change(uci_to_delta(e));
1021
1022 blobmsg_close_array(&buf, c);
1023
1024 ubus_send_reply(ctx, req, buf.head);
1025
1026 out:
1027 if (p)
1028 uci_unload(cursor, p);
1029
1030 return rpc_uci_status();
1031 }
1032
1033 static int
1034 rpc_uci_revert_commit(struct blob_attr *msg, bool commit)
1035 {
1036 struct blob_attr *tb[__RPC_C_MAX];
1037 struct uci_package *p = NULL;
1038 struct uci_ptr ptr = { 0 };
1039
1040 blobmsg_parse(rpc_uci_config_policy, __RPC_C_MAX, tb,
1041 blob_data(msg), blob_len(msg));
1042
1043 if (!tb[RPC_C_CONFIG])
1044 return UBUS_STATUS_INVALID_ARGUMENT;
1045
1046 if (!rpc_uci_write_access(tb[RPC_C_SESSION], tb[RPC_C_CONFIG]))
1047 return UBUS_STATUS_PERMISSION_DENIED;
1048
1049 ptr.package = blobmsg_data(tb[RPC_C_CONFIG]);
1050
1051 if (commit)
1052 {
1053 uci_load(cursor, ptr.package, &p);
1054
1055 if (p)
1056 {
1057 uci_commit(cursor, &p, false);
1058 uci_unload(cursor, p);
1059 }
1060 }
1061 else
1062 {
1063 if (!uci_lookup_ptr(cursor, &ptr, NULL, true) && ptr.p)
1064 uci_revert(cursor, &ptr);
1065 }
1066
1067 return rpc_uci_status();
1068 }
1069
1070 static int
1071 rpc_uci_revert(struct ubus_context *ctx, struct ubus_object *obj,
1072 struct ubus_request_data *req, const char *method,
1073 struct blob_attr *msg)
1074 {
1075 return rpc_uci_revert_commit(msg, false);
1076 }
1077
1078 static int
1079 rpc_uci_commit(struct ubus_context *ctx, struct ubus_object *obj,
1080 struct ubus_request_data *req, const char *method,
1081 struct blob_attr *msg)
1082 {
1083 return rpc_uci_revert_commit(msg, true);
1084 }
1085
1086 static int
1087 rpc_uci_configs(struct ubus_context *ctx, struct ubus_object *obj,
1088 struct ubus_request_data *req, const char *method,
1089 struct blob_attr *msg)
1090 {
1091 char **configs;
1092 void *c;
1093 int i;
1094
1095 if (uci_list_configs(cursor, &configs))
1096 goto out;
1097
1098 blob_buf_init(&buf, 0);
1099
1100 c = blobmsg_open_array(&buf, "configs");
1101
1102 for (i = 0; configs[i]; i++)
1103 blobmsg_add_string(&buf, NULL, configs[i]);
1104
1105 blobmsg_close_array(&buf, c);
1106
1107 ubus_send_reply(ctx, req, buf.head);
1108
1109 out:
1110 return rpc_uci_status();
1111 }
1112
1113
1114 /*
1115 * Remove given delta save directory (if any).
1116 */
1117 static void
1118 rpc_uci_purge_savedir(const char *path)
1119 {
1120 DIR *d;
1121 struct stat s;
1122 struct dirent *e;
1123 char file[PATH_MAX];
1124
1125 if (stat(path, &s) || !S_ISDIR(s.st_mode))
1126 return;
1127
1128 if ((d = opendir(path)) != NULL)
1129 {
1130 while ((e = readdir(d)) != NULL)
1131 {
1132 snprintf(file, sizeof(file) - 1, "%s/%s", path, e->d_name);
1133
1134 if (stat(file, &s) || !S_ISREG(s.st_mode))
1135 continue;
1136
1137 unlink(file);
1138 }
1139
1140 closedir(d);
1141
1142 rmdir(path);
1143 }
1144 }
1145
1146 /*
1147 * Session destroy callback to purge associated delta directory.
1148 */
1149 static void
1150 rpc_uci_purge_savedir_cb(struct rpc_session *ses, void *priv)
1151 {
1152 char path[PATH_MAX];
1153
1154 snprintf(path, sizeof(path) - 1, "/tmp/.uci-rpc-%s", ses->id);
1155 rpc_uci_purge_savedir(path);
1156 }
1157
1158 /*
1159 * Removes all delta directories which match the /tmp/.uci-rpc-* pattern.
1160 * This is used to clean up garbage when starting rpcd.
1161 */
1162 void rpc_uci_purge_savedirs(void)
1163 {
1164 int i;
1165 glob_t gl;
1166
1167 if (!glob("/tmp/.uci-rpc-*", 0, NULL, &gl))
1168 {
1169 for (i = 0; i < gl.gl_pathc; i++)
1170 rpc_uci_purge_savedir(gl.gl_pathv[i]);
1171
1172 globfree(&gl);
1173 }
1174 }
1175
1176 int rpc_uci_api_init(struct ubus_context *ctx)
1177 {
1178 static const struct ubus_method uci_methods[] = {
1179 { .name = "configs", .handler = rpc_uci_configs },
1180 UBUS_METHOD("get", rpc_uci_get, rpc_uci_get_policy),
1181 UBUS_METHOD("add", rpc_uci_add, rpc_uci_add_policy),
1182 UBUS_METHOD("set", rpc_uci_set, rpc_uci_set_policy),
1183 UBUS_METHOD("delete", rpc_uci_delete, rpc_uci_delete_policy),
1184 UBUS_METHOD("rename", rpc_uci_rename, rpc_uci_rename_policy),
1185 UBUS_METHOD("order", rpc_uci_order, rpc_uci_order_policy),
1186 UBUS_METHOD("changes", rpc_uci_changes, rpc_uci_config_policy),
1187 UBUS_METHOD("revert", rpc_uci_revert, rpc_uci_config_policy),
1188 UBUS_METHOD("commit", rpc_uci_commit, rpc_uci_config_policy),
1189 };
1190
1191 static struct ubus_object_type uci_type =
1192 UBUS_OBJECT_TYPE("luci-rpc-uci", uci_methods);
1193
1194 static struct ubus_object obj = {
1195 .name = "uci",
1196 .type = &uci_type,
1197 .methods = uci_methods,
1198 .n_methods = ARRAY_SIZE(uci_methods),
1199 };
1200
1201 static struct rpc_session_cb cb = {
1202 .cb = rpc_uci_purge_savedir_cb
1203 };
1204
1205 cursor = uci_alloc_context();
1206
1207 if (!cursor)
1208 return UBUS_STATUS_UNKNOWN_ERROR;
1209
1210 rpc_session_destroy_cb(&cb);
1211
1212 return ubus_add_object(ctx, &obj);
1213 }
OpenWrt ubus RPC daemon