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[project/rpcd.git] / uci.c
1 /*
2 * rpcd - UBUS RPC server
3 *
4 * Copyright (C) 2013-2014 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 <libgen.h>
20 #include <glob.h>
21
22 #include <libubox/blobmsg.h>
23 #include <libubox/blobmsg_json.h>
24
25 #include <rpcd/uci.h>
26 #include <rpcd/exec.h>
27 #include <rpcd/session.h>
28
29 static struct blob_buf buf;
30 static struct uci_context *cursor;
31 static struct uloop_timeout apply_timer;
32 static struct ubus_context *apply_ctx;
33
34 char apply_sid[RPC_SID_LEN + 1];
35
36 enum {
37 RPC_G_CONFIG,
38 RPC_G_SECTION,
39 RPC_G_OPTION,
40 RPC_G_TYPE,
41 RPC_G_MATCH,
42 RPC_G_SESSION,
43 __RPC_G_MAX,
44 };
45
46 static const struct blobmsg_policy rpc_uci_get_policy[__RPC_G_MAX] = {
47 [RPC_G_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
48 [RPC_G_SECTION] = { .name = "section", .type = BLOBMSG_TYPE_STRING },
49 [RPC_G_OPTION] = { .name = "option", .type = BLOBMSG_TYPE_STRING },
50 [RPC_G_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
51 [RPC_G_MATCH] = { .name = "match", .type = BLOBMSG_TYPE_TABLE },
52 [RPC_G_SESSION] = { .name = "ubus_rpc_session",
53 .type = BLOBMSG_TYPE_STRING },
54 };
55
56 enum {
57 RPC_A_CONFIG,
58 RPC_A_TYPE,
59 RPC_A_NAME,
60 RPC_A_VALUES,
61 RPC_A_SESSION,
62 __RPC_A_MAX,
63 };
64
65 static const struct blobmsg_policy rpc_uci_add_policy[__RPC_A_MAX] = {
66 [RPC_A_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
67 [RPC_A_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
68 [RPC_A_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
69 [RPC_A_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
70 [RPC_A_SESSION] = { .name = "ubus_rpc_session",
71 .type = BLOBMSG_TYPE_STRING },
72 };
73
74 enum {
75 RPC_S_CONFIG,
76 RPC_S_SECTION,
77 RPC_S_TYPE,
78 RPC_S_MATCH,
79 RPC_S_VALUES,
80 RPC_S_SESSION,
81 __RPC_S_MAX,
82 };
83
84 static const struct blobmsg_policy rpc_uci_set_policy[__RPC_S_MAX] = {
85 [RPC_S_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
86 [RPC_S_SECTION] = { .name = "section", .type = BLOBMSG_TYPE_STRING },
87 [RPC_S_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
88 [RPC_S_MATCH] = { .name = "match", .type = BLOBMSG_TYPE_TABLE },
89 [RPC_S_VALUES] = { .name = "values", .type = BLOBMSG_TYPE_TABLE },
90 [RPC_S_SESSION] = { .name = "ubus_rpc_session",
91 .type = BLOBMSG_TYPE_STRING },
92 };
93
94 enum {
95 RPC_D_CONFIG,
96 RPC_D_SECTION,
97 RPC_D_TYPE,
98 RPC_D_MATCH,
99 RPC_D_OPTION,
100 RPC_D_OPTIONS,
101 RPC_D_SESSION,
102 __RPC_D_MAX,
103 };
104
105 static const struct blobmsg_policy rpc_uci_delete_policy[__RPC_D_MAX] = {
106 [RPC_D_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
107 [RPC_D_SECTION] = { .name = "section", .type = BLOBMSG_TYPE_STRING },
108 [RPC_D_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
109 [RPC_D_MATCH] = { .name = "match", .type = BLOBMSG_TYPE_TABLE },
110 [RPC_D_OPTION] = { .name = "option", .type = BLOBMSG_TYPE_STRING },
111 [RPC_D_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_ARRAY },
112 [RPC_D_SESSION] = { .name = "ubus_rpc_session",
113 .type = BLOBMSG_TYPE_STRING },
114 };
115
116 enum {
117 RPC_R_CONFIG,
118 RPC_R_SECTION,
119 RPC_R_OPTION,
120 RPC_R_NAME,
121 RPC_R_SESSION,
122 __RPC_R_MAX,
123 };
124
125 static const struct blobmsg_policy rpc_uci_rename_policy[__RPC_R_MAX] = {
126 [RPC_R_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
127 [RPC_R_SECTION] = { .name = "section", .type = BLOBMSG_TYPE_STRING },
128 [RPC_R_OPTION] = { .name = "option", .type = BLOBMSG_TYPE_STRING },
129 [RPC_R_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
130 [RPC_R_SESSION] = { .name = "ubus_rpc_session",
131 .type = BLOBMSG_TYPE_STRING },
132 };
133
134 enum {
135 RPC_O_CONFIG,
136 RPC_O_SECTIONS,
137 RPC_O_SESSION,
138 __RPC_O_MAX,
139 };
140
141 static const struct blobmsg_policy rpc_uci_order_policy[__RPC_O_MAX] = {
142 [RPC_O_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
143 [RPC_O_SECTIONS] = { .name = "sections", .type = BLOBMSG_TYPE_ARRAY },
144 [RPC_O_SESSION] = { .name = "ubus_rpc_session",
145 .type = BLOBMSG_TYPE_STRING },
146 };
147
148 enum {
149 RPC_C_CONFIG,
150 RPC_C_SESSION,
151 __RPC_C_MAX,
152 };
153
154 static const struct blobmsg_policy rpc_uci_config_policy[__RPC_C_MAX] = {
155 [RPC_C_CONFIG] = { .name = "config", .type = BLOBMSG_TYPE_STRING },
156 [RPC_C_SESSION] = { .name = "ubus_rpc_session",
157 .type = BLOBMSG_TYPE_STRING },
158 };
159
160 enum {
161 RPC_T_ROLLBACK,
162 RPC_T_TIMEOUT,
163 RPC_T_SESSION,
164 __RPC_T_MAX,
165 };
166
167 static const struct blobmsg_policy rpc_uci_apply_policy[__RPC_T_MAX] = {
168 [RPC_T_ROLLBACK] = { .name = "rollback", .type = BLOBMSG_TYPE_BOOL },
169 [RPC_T_TIMEOUT] = { .name = "timeout", .type = BLOBMSG_TYPE_INT32 },
170 [RPC_T_SESSION] = { .name = "ubus_rpc_session",
171 .type = BLOBMSG_TYPE_STRING },
172 };
173
174 enum {
175 RPC_B_SESSION,
176 __RPC_B_MAX,
177 };
178
179 static const struct blobmsg_policy rpc_uci_rollback_policy[__RPC_B_MAX] = {
180 [RPC_B_SESSION] = { .name = "ubus_rpc_session",
181 .type = BLOBMSG_TYPE_STRING },
182 };
183
184 /*
185 * Validate a uci name
186 */
187 static bool
188 rpc_uci_verify_str(const char *name, bool extended, bool type)
189 {
190 const char *c;
191 char *e;
192
193 if (!name || !*name)
194 return false;
195
196 if (extended && *name != '@')
197 extended = false;
198
199 for (c = name + extended; *c; c++)
200 if (!isalnum(*c) && *c != '_' && ((!type && !extended) || *c != '-'))
201 break;
202
203 if (extended) {
204 if (*c != '[')
205 return false;
206
207 strtol(++c, &e, 10);
208
209 return (e > c && *e == ']' && *(e+1) == 0);
210 }
211
212 return (*c == 0);
213 }
214
215 /*
216 * Check that string is a valid, shell compatible uci name
217 */
218 static bool rpc_uci_verify_name(const char *name) {
219 return rpc_uci_verify_str(name, false, false);
220 }
221
222 /*
223 * Check that string is a valid section type name
224 */
225 static bool rpc_uci_verify_type(const char *type) {
226 return rpc_uci_verify_str(type, false, true);
227 }
228
229 /*
230 * Check that the string is a valid section id, optionally in extended
231 * lookup notation
232 */
233 static bool rpc_uci_verify_section(const char *section) {
234 return rpc_uci_verify_str(section, true, false);
235 }
236
237
238 /*
239 * Turn uci error state into ubus return code
240 */
241 static int
242 rpc_uci_status(void)
243 {
244 switch (cursor->err)
245 {
246 case UCI_OK:
247 return UBUS_STATUS_OK;
248
249 case UCI_ERR_INVAL:
250 return UBUS_STATUS_INVALID_ARGUMENT;
251
252 case UCI_ERR_NOTFOUND:
253 return UBUS_STATUS_NOT_FOUND;
254
255 default:
256 return UBUS_STATUS_UNKNOWN_ERROR;
257 }
258 }
259
260 /*
261 * Clear all save directories from the uci cursor and append the given path
262 * as new save directory.
263 */
264 static void
265 rpc_uci_replace_savedir(const char *path)
266 {
267 struct uci_element *e, *tmp;
268
269 uci_foreach_element_safe(&cursor->delta_path, tmp, e) {
270 if (e->name)
271 free(e->name);
272
273 free(e);
274 }
275
276 cursor->delta_path.prev = &cursor->delta_path;
277 cursor->delta_path.next = &cursor->delta_path;
278
279 if (path)
280 uci_set_savedir(cursor, path);
281 }
282
283 /*
284 * Setup per-session delta save directory. If the passed "sid" blob attribute
285 * pointer is NULL then the precedure was not invoked through the ubus-rpc so
286 * we do not perform session isolation and use the default save directory.
287 */
288 static void
289 rpc_uci_set_savedir(struct blob_attr *sid)
290 {
291 char path[PATH_MAX];
292
293 if (!sid)
294 {
295 rpc_uci_replace_savedir("/tmp/.uci");
296 return;
297 }
298
299 snprintf(path, sizeof(path) - 1,
300 RPC_UCI_SAVEDIR_PREFIX "%s", blobmsg_get_string(sid));
301
302 rpc_uci_replace_savedir(path);
303 }
304
305 /*
306 * Test read access to given config. If the passed "sid" blob attribute pointer
307 * is NULL then the precedure was not invoked through the ubus-rpc so we do not
308 * perform access control and always assume true.
309 */
310 static bool
311 rpc_uci_read_access(struct blob_attr *sid, struct blob_attr *config)
312 {
313 rpc_uci_set_savedir(sid);
314
315 if (!sid)
316 return true;
317
318 return rpc_session_access(blobmsg_data(sid), "uci",
319 blobmsg_data(config), "read");
320 }
321
322 /*
323 * Test write access to given config. If the passed "sid" blob attribute pointer
324 * is NULL then the precedure was not invoked through the ubus-rpc so we do not
325 * perform access control and always assume true.
326 */
327 static bool
328 rpc_uci_write_access(struct blob_attr *sid, struct blob_attr *config)
329 {
330 rpc_uci_set_savedir(sid);
331
332 if (!sid)
333 return true;
334
335 return rpc_session_access(blobmsg_data(sid), "uci",
336 blobmsg_data(config), "write");
337 }
338
339 /*
340 * Format applicable blob value as string and place a pointer to the string
341 * buffer in "p". Uses a static string buffer.
342 */
343 static bool
344 rpc_uci_format_blob(struct blob_attr *v, const char **p)
345 {
346 static char buf[21];
347
348 *p = NULL;
349
350 switch (blobmsg_type(v))
351 {
352 case BLOBMSG_TYPE_STRING:
353 *p = blobmsg_data(v);
354 break;
355
356 case BLOBMSG_TYPE_INT64:
357 snprintf(buf, sizeof(buf), "%"PRIu64, blobmsg_get_u64(v));
358 *p = buf;
359 break;
360
361 case BLOBMSG_TYPE_INT32:
362 snprintf(buf, sizeof(buf), "%u", blobmsg_get_u32(v));
363 *p = buf;
364 break;
365
366 case BLOBMSG_TYPE_INT16:
367 snprintf(buf, sizeof(buf), "%u", blobmsg_get_u16(v));
368 *p = buf;
369 break;
370
371 case BLOBMSG_TYPE_INT8:
372 snprintf(buf, sizeof(buf), "%u", !!blobmsg_get_u8(v));
373 *p = buf;
374 break;
375
376 default:
377 break;
378 }
379
380 return !!*p;
381 }
382
383 /*
384 * Lookup the given uci_ptr and enable extended lookup format if the .section
385 * value of the uci_ptr looks like extended syntax. Uses an internal copy
386 * of the given uci_ptr to perform the lookup as failing extended section
387 * lookup operations in libuci will zero our the uci_ptr struct.
388 * Copies the internal uci_ptr back to given the uci_ptr on success.
389 */
390 static int
391 rpc_uci_lookup(struct uci_ptr *ptr)
392 {
393 int rv;
394 struct uci_ptr lookup = *ptr;
395
396 if (!lookup.s && lookup.section && *lookup.section == '@')
397 lookup.flags |= UCI_LOOKUP_EXTENDED;
398
399 rv = uci_lookup_ptr(cursor, &lookup, NULL, true);
400
401 if (!rv)
402 *ptr = lookup;
403
404 return rv;
405 }
406
407 /*
408 * Checks whether the given uci_option object matches the given string value.
409 * 1) If the uci_option is of type list, check whether any of the list elements
410 * equals to the given string
411 * 2) If the uci_option is of type string, parse it into space separated tokens
412 * and check if any of the tokens equals to the given string.
413 * Returns true if a list element or token matched the given string.
414 */
415 static bool
416 rpc_uci_match_option(struct uci_option *o, const char *cmp)
417 {
418 struct uci_element *e;
419 char *s, *p;
420
421 if (o->type == UCI_TYPE_LIST)
422 {
423 uci_foreach_element(&o->v.list, e)
424 if (e->name && !strcmp(e->name, cmp))
425 return true;
426
427 return false;
428 }
429
430 if (!o->v.string)
431 return false;
432
433 s = strdup(o->v.string);
434
435 if (!s)
436 return false;
437
438 for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
439 {
440 if (!strcmp(p, cmp))
441 {
442 free(s);
443 return true;
444 }
445 }
446
447 free(s);
448 return false;
449 }
450
451 /*
452 * Checks whether the given uci_section matches the type and value blob attrs.
453 * 1) Returns false if "type" is given and the section type does not match
454 * the value specified in the "type" string blob attribute, else continue.
455 * 2) Tests whether any key in the "matches" table blob attribute exists in
456 * the given uci_section and whether each value is contained in the
457 * corresponding uci option value (see rpc_uci_match_option()).
458 * 3) A missing or empty "matches" table blob attribute is always considered
459 * to be a match.
460 * Returns true if "type" matches or is NULL and "matches" matches or is NULL.
461 */
462 static bool
463 rpc_uci_match_section(struct uci_section *s,
464 struct blob_attr *type, struct blob_attr *matches)
465 {
466 struct uci_element *e;
467 struct blob_attr *cur;
468 const char *cmp;
469 bool match = false;
470 bool empty = true;
471 int rem;
472
473 if (type && strcmp(s->type, blobmsg_data(type)))
474 return false;
475
476 if (!matches)
477 return true;
478
479 blobmsg_for_each_attr(cur, matches, rem)
480 {
481 if (!rpc_uci_format_blob(cur, &cmp))
482 continue;
483
484 uci_foreach_element(&s->options, e)
485 {
486 if (strcmp(e->name, blobmsg_name(cur)))
487 continue;
488
489 if (!rpc_uci_match_option(uci_to_option(e), cmp))
490 return false;
491
492 match = true;
493 }
494
495 empty = false;
496 }
497
498 return (empty || match);
499 }
500
501 /*
502 * Dump the given uci_option value into the global blobmsg buffer and use
503 * given "name" as key.
504 * 1) If the uci_option is of type list, put a table into the blob buffer and
505 * add each list item as string to it.
506 * 2) If the uci_option is of type string, put its value directly into the blob
507 * buffer.
508 */
509 static void
510 rpc_uci_dump_option(struct uci_option *o, const char *name)
511 {
512 void *c;
513 struct uci_element *e;
514
515 switch (o->type)
516 {
517 case UCI_TYPE_STRING:
518 blobmsg_add_string(&buf, name, o->v.string);
519 break;
520
521 case UCI_TYPE_LIST:
522 c = blobmsg_open_array(&buf, name);
523
524 uci_foreach_element(&o->v.list, e)
525 blobmsg_add_string(&buf, NULL, e->name);
526
527 blobmsg_close_array(&buf, c);
528 break;
529
530 default:
531 break;
532 }
533 }
534
535 /*
536 * Dump the given uci_section object into the global blobmsg buffer and use
537 * given "name" as key.
538 * Puts a table into the blob buffer and puts each section option member value
539 * as value into the table using the option name as key.
540 * Adds three special keys ".anonymous", ".type" and ".name" which specify the
541 * corresponding section properties.
542 */
543 static void
544 rpc_uci_dump_section(struct uci_section *s, const char *name, int index)
545 {
546 void *c;
547 struct uci_option *o;
548 struct uci_element *e;
549
550 c = blobmsg_open_table(&buf, name);
551
552 blobmsg_add_u8(&buf, ".anonymous", s->anonymous);
553 blobmsg_add_string(&buf, ".type", s->type);
554 blobmsg_add_string(&buf, ".name", s->e.name);
555
556 if (index >= 0)
557 blobmsg_add_u32(&buf, ".index", index);
558
559 uci_foreach_element(&s->options, e)
560 {
561 o = uci_to_option(e);
562 rpc_uci_dump_option(o, o->e.name);
563 }
564
565 blobmsg_close_table(&buf, c);
566 }
567
568 /*
569 * Dump the given uci_package object into the global blobmsg buffer and use
570 * given "name" as key.
571 * Puts a table into the blob buffer and puts each package section member as
572 * value into the table using the section name as key.
573 * Only dumps sections matching the given "type" and "matches", see explaination
574 * of rpc_uci_match_section() for details.
575 */
576 static void
577 rpc_uci_dump_package(struct uci_package *p, const char *name,
578 struct blob_attr *type, struct blob_attr *matches)
579 {
580 void *c;
581 struct uci_element *e;
582 int i = -1;
583
584 c = blobmsg_open_table(&buf, name);
585
586 uci_foreach_element(&p->sections, e)
587 {
588 i++;
589
590 if (!rpc_uci_match_section(uci_to_section(e), type, matches))
591 continue;
592
593 rpc_uci_dump_section(uci_to_section(e), e->name, i);
594 }
595
596 blobmsg_close_table(&buf, c);
597 }
598
599
600 static int
601 rpc_uci_getcommon(struct ubus_context *ctx, struct ubus_request_data *req,
602 struct blob_attr *msg, bool use_state)
603 {
604 struct blob_attr *tb[__RPC_G_MAX];
605 struct uci_package *p = NULL;
606 struct uci_ptr ptr = { 0 };
607
608 blobmsg_parse(rpc_uci_get_policy, __RPC_G_MAX, tb,
609 blob_data(msg), blob_len(msg));
610
611 if (!tb[RPC_G_CONFIG])
612 return UBUS_STATUS_INVALID_ARGUMENT;
613
614 if (!rpc_uci_read_access(tb[RPC_G_SESSION], tb[RPC_G_CONFIG]))
615 return UBUS_STATUS_PERMISSION_DENIED;
616
617 ptr.package = blobmsg_data(tb[RPC_G_CONFIG]);
618
619 if (use_state)
620 uci_set_savedir(cursor, "/var/state");
621
622 if (uci_load(cursor, ptr.package, &p))
623 return rpc_uci_status();
624
625 if (tb[RPC_G_SECTION])
626 {
627 ptr.section = blobmsg_data(tb[RPC_G_SECTION]);
628
629 if (tb[RPC_G_OPTION])
630 ptr.option = blobmsg_data(tb[RPC_G_OPTION]);
631 }
632
633 if (rpc_uci_lookup(&ptr) || !(ptr.flags & UCI_LOOKUP_COMPLETE))
634 goto out;
635
636 blob_buf_init(&buf, 0);
637
638 switch (ptr.last->type)
639 {
640 case UCI_TYPE_PACKAGE:
641 rpc_uci_dump_package(ptr.p, "values", tb[RPC_G_TYPE], tb[RPC_G_MATCH]);
642 break;
643
644 case UCI_TYPE_SECTION:
645 rpc_uci_dump_section(ptr.s, "values", -1);
646 break;
647
648 case UCI_TYPE_OPTION:
649 rpc_uci_dump_option(ptr.o, "value");
650 break;
651
652 default:
653 break;
654 }
655
656 ubus_send_reply(ctx, req, buf.head);
657
658 out:
659 uci_unload(cursor, p);
660
661 return rpc_uci_status();
662 }
663
664 static int
665 rpc_uci_get(struct ubus_context *ctx, struct ubus_object *obj,
666 struct ubus_request_data *req, const char *method,
667 struct blob_attr *msg)
668 {
669 return rpc_uci_getcommon(ctx, req, msg, false);
670 }
671
672 static int
673 rpc_uci_state(struct ubus_context *ctx, struct ubus_object *obj,
674 struct ubus_request_data *req, const char *method,
675 struct blob_attr *msg)
676 {
677 return rpc_uci_getcommon(ctx, req, msg, true);
678 }
679
680 static int
681 rpc_uci_add(struct ubus_context *ctx, struct ubus_object *obj,
682 struct ubus_request_data *req, const char *method,
683 struct blob_attr *msg)
684 {
685 struct blob_attr *tb[__RPC_A_MAX];
686 struct blob_attr *cur, *elem;
687 struct uci_package *p = NULL;
688 struct uci_section *s;
689 struct uci_ptr ptr = { 0 };
690 int rem, rem2, err = 0;
691
692 blobmsg_parse(rpc_uci_add_policy, __RPC_A_MAX, tb,
693 blob_data(msg), blob_len(msg));
694
695 if (!tb[RPC_A_CONFIG] || !tb[RPC_A_TYPE])
696 return UBUS_STATUS_INVALID_ARGUMENT;
697
698 if (!rpc_uci_write_access(tb[RPC_A_SESSION], tb[RPC_A_CONFIG]))
699 return UBUS_STATUS_PERMISSION_DENIED;
700
701 if (!rpc_uci_verify_type(blobmsg_data(tb[RPC_A_TYPE])))
702 return UBUS_STATUS_INVALID_ARGUMENT;
703
704 if (tb[RPC_A_NAME] &&
705 !rpc_uci_verify_name(blobmsg_data(tb[RPC_A_NAME])))
706 return UBUS_STATUS_INVALID_ARGUMENT;
707
708 ptr.package = blobmsg_data(tb[RPC_A_CONFIG]);
709
710 if (uci_load(cursor, ptr.package, &p))
711 return rpc_uci_status();
712
713 /* add named section */
714 if (tb[RPC_A_NAME])
715 {
716 ptr.section = blobmsg_data(tb[RPC_A_NAME]);
717 ptr.value = blobmsg_data(tb[RPC_A_TYPE]);
718 ptr.option = NULL;
719
720 if (rpc_uci_lookup(&ptr) || uci_set(cursor, &ptr))
721 goto out;
722 }
723
724 /* add anon section */
725 else
726 {
727 if (uci_add_section(cursor, p, blobmsg_data(tb[RPC_A_TYPE]), &s) || !s)
728 goto out;
729
730 ptr.section = s->e.name;
731 }
732
733 if (tb[RPC_A_VALUES])
734 {
735 blobmsg_for_each_attr(cur, tb[RPC_A_VALUES], rem)
736 {
737 ptr.flags = 0;
738 ptr.o = NULL;
739 ptr.option = blobmsg_name(cur);
740
741 if (!rpc_uci_verify_name(ptr.option))
742 {
743 if (!err)
744 err = UBUS_STATUS_INVALID_ARGUMENT;
745
746 continue;
747 }
748
749 if (rpc_uci_lookup(&ptr) || !ptr.s)
750 {
751 if (!err)
752 err = UBUS_STATUS_NOT_FOUND;
753
754 continue;
755 }
756
757 switch (blobmsg_type(cur))
758 {
759 case BLOBMSG_TYPE_ARRAY:
760 blobmsg_for_each_attr(elem, cur, rem2)
761 {
762 if (!rpc_uci_format_blob(elem, &ptr.value))
763 {
764 if (!err)
765 err = UBUS_STATUS_INVALID_ARGUMENT;
766
767 continue;
768 }
769
770 uci_add_list(cursor, &ptr);
771 }
772
773 break;
774
775 default:
776 if (!rpc_uci_format_blob(cur, &ptr.value))
777 {
778 if (!err)
779 err = UBUS_STATUS_INVALID_ARGUMENT;
780 }
781 else
782 {
783 uci_set(cursor, &ptr);
784 }
785
786 break;
787 }
788 }
789 }
790
791 if (!err)
792 {
793 uci_save(cursor, p);
794
795 blob_buf_init(&buf, 0);
796 blobmsg_add_string(&buf, "section", ptr.section);
797 ubus_send_reply(ctx, req, buf.head);
798 }
799
800 out:
801 uci_unload(cursor, p);
802
803 return err ? err : rpc_uci_status();
804 }
805
806 /*
807 * Turn value from a blob attribute into uci set operation
808 * 1) if the blob is of type array, delete existing option (if any) and
809 * emit uci add_list operations for each element
810 * 2) if the blob is not an array but an option of type list exists,
811 * delete existing list and emit uci set operation for the blob value
812 * 3) in all other cases only emit a set operation if there is no existing
813 * option of if the existing options value differs from the blob value
814 */
815 static int
816 rpc_uci_merge_set(struct blob_attr *opt, struct uci_ptr *ptr)
817 {
818 struct blob_attr *cur;
819 int rem, rv;
820
821 ptr->flags = 0;
822 ptr->o = NULL;
823 ptr->option = blobmsg_name(opt);
824 ptr->value = NULL;
825
826 if (!rpc_uci_verify_name(ptr->option))
827 return UBUS_STATUS_INVALID_ARGUMENT;
828
829 if (rpc_uci_lookup(ptr) || !ptr->s)
830 return UBUS_STATUS_NOT_FOUND;
831
832 if (blobmsg_type(opt) == BLOBMSG_TYPE_ARRAY)
833 {
834 if (ptr->o) {
835 uci_delete(cursor, ptr);
836 ptr->flags = 0;
837 }
838
839 rv = UBUS_STATUS_INVALID_ARGUMENT;
840
841 blobmsg_for_each_attr(cur, opt, rem)
842 {
843 if (!rpc_uci_format_blob(cur, &ptr->value))
844 continue;
845
846 uci_add_list(cursor, ptr);
847 rv = 0;
848 }
849
850 return rv;
851 }
852 else if (ptr->o && ptr->o->type == UCI_TYPE_LIST)
853 {
854 uci_delete(cursor, ptr);
855 ptr->flags = 0;
856
857 if (!rpc_uci_format_blob(opt, &ptr->value))
858 return UBUS_STATUS_INVALID_ARGUMENT;
859
860 uci_set(cursor, ptr);
861 }
862 else
863 {
864 if (!rpc_uci_format_blob(opt, &ptr->value))
865 return UBUS_STATUS_INVALID_ARGUMENT;
866
867 if (!ptr->o || !ptr->o->v.string || strcmp(ptr->o->v.string, ptr->value))
868 uci_set(cursor, ptr);
869 }
870
871 return 0;
872 }
873
874 static int
875 rpc_uci_set(struct ubus_context *ctx, struct ubus_object *obj,
876 struct ubus_request_data *req, const char *method,
877 struct blob_attr *msg)
878 {
879 struct blob_attr *tb[__RPC_S_MAX];
880 struct blob_attr *cur;
881 struct uci_package *p = NULL;
882 struct uci_element *e;
883 struct uci_ptr ptr = { 0 };
884 int rem, rv, err = 0;
885
886 blobmsg_parse(rpc_uci_set_policy, __RPC_S_MAX, tb,
887 blob_data(msg), blob_len(msg));
888
889 if (!tb[RPC_S_CONFIG] || !tb[RPC_S_VALUES] ||
890 (!tb[RPC_S_SECTION] && !tb[RPC_S_TYPE] && !tb[RPC_S_MATCH]))
891 return UBUS_STATUS_INVALID_ARGUMENT;
892
893 if (!rpc_uci_write_access(tb[RPC_S_SESSION], tb[RPC_S_CONFIG]))
894 return UBUS_STATUS_PERMISSION_DENIED;
895
896 if (tb[RPC_S_SECTION] &&
897 !rpc_uci_verify_section(blobmsg_data(tb[RPC_S_SECTION])))
898 return UBUS_STATUS_INVALID_ARGUMENT;
899
900 ptr.package = blobmsg_data(tb[RPC_S_CONFIG]);
901
902 if (uci_load(cursor, ptr.package, &p))
903 return rpc_uci_status();
904
905 if (tb[RPC_S_SECTION])
906 {
907 ptr.section = blobmsg_data(tb[RPC_S_SECTION]);
908 blobmsg_for_each_attr(cur, tb[RPC_S_VALUES], rem)
909 {
910 rv = rpc_uci_merge_set(cur, &ptr);
911
912 if (rv)
913 err = rv;
914 }
915 }
916 else
917 {
918 uci_foreach_element(&p->sections, e)
919 {
920 if (!rpc_uci_match_section(uci_to_section(e),
921 tb[RPC_S_TYPE], tb[RPC_S_MATCH]))
922 continue;
923
924 ptr.s = NULL;
925 ptr.section = e->name;
926
927 blobmsg_for_each_attr(cur, tb[RPC_S_VALUES], rem)
928 {
929 rv = rpc_uci_merge_set(cur, &ptr);
930
931 if (rv)
932 err = rv;
933 }
934 }
935 }
936
937 if (!err && !ptr.s)
938 err = UBUS_STATUS_NOT_FOUND;
939
940 if (!err)
941 uci_save(cursor, p);
942
943 uci_unload(cursor, p);
944
945 return err ? err : rpc_uci_status();
946 }
947
948 /*
949 * Delete option or section from uci specified by given blob attribute pointer
950 * 1) if the blob is of type array, delete any option named after each element
951 * 2) if the blob is of type string, delete the option named after its value
952 * 3) if the blob is NULL, delete entire section
953 */
954 static int
955 rpc_uci_merge_delete(struct blob_attr *opt, struct uci_ptr *ptr)
956 {
957 struct blob_attr *cur;
958 int rem, rv;
959
960 if (rpc_uci_lookup(ptr) || !ptr->s)
961 return UBUS_STATUS_NOT_FOUND;
962
963 if (!opt)
964 {
965 ptr->o = NULL;
966 ptr->option = NULL;
967
968 uci_delete(cursor, ptr);
969 return 0;
970 }
971 else if (blobmsg_type(opt) == BLOBMSG_TYPE_ARRAY)
972 {
973 rv = UBUS_STATUS_NOT_FOUND;
974
975 blobmsg_for_each_attr(cur, opt, rem)
976 {
977 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
978 continue;
979
980 ptr->o = NULL;
981 ptr->option = blobmsg_data(cur);
982
983 if (rpc_uci_lookup(ptr) || !ptr->o)
984 continue;
985
986 uci_delete(cursor, ptr);
987 ptr->flags = 0;
988 rv = 0;
989 }
990
991 return rv;
992 }
993 else if (blobmsg_type(opt) == BLOBMSG_TYPE_STRING)
994 {
995 ptr->o = NULL;
996 ptr->option = blobmsg_data(opt);
997
998 if (rpc_uci_lookup(ptr) || !ptr->o)
999 return UBUS_STATUS_NOT_FOUND;
1000
1001 uci_delete(cursor, ptr);
1002 return 0;
1003 }
1004
1005 return UBUS_STATUS_INVALID_ARGUMENT;
1006 }
1007
1008 static int
1009 rpc_uci_delete(struct ubus_context *ctx, struct ubus_object *obj,
1010 struct ubus_request_data *req, const char *method,
1011 struct blob_attr *msg)
1012 {
1013 struct blob_attr *tb[__RPC_D_MAX];
1014 struct uci_package *p = NULL;
1015 struct uci_element *e, *tmp;
1016 struct uci_ptr ptr = { 0 };
1017 int err = 0;
1018
1019 blobmsg_parse(rpc_uci_delete_policy, __RPC_D_MAX, tb,
1020 blob_data(msg), blob_len(msg));
1021
1022 if (!tb[RPC_D_CONFIG] ||
1023 (!tb[RPC_D_SECTION] && !tb[RPC_D_TYPE] && !tb[RPC_D_MATCH]))
1024 return UBUS_STATUS_INVALID_ARGUMENT;
1025
1026 if (!rpc_uci_write_access(tb[RPC_D_SESSION], tb[RPC_D_CONFIG]))
1027 return UBUS_STATUS_PERMISSION_DENIED;
1028
1029 if (tb[RPC_D_TYPE] &&
1030 !rpc_uci_verify_type(blobmsg_data(tb[RPC_D_TYPE])))
1031 return UBUS_STATUS_INVALID_ARGUMENT;
1032
1033 if (tb[RPC_D_SECTION] &&
1034 !rpc_uci_verify_section(blobmsg_data(tb[RPC_D_SECTION])))
1035 return UBUS_STATUS_INVALID_ARGUMENT;
1036
1037 ptr.package = blobmsg_data(tb[RPC_D_CONFIG]);
1038
1039 if (uci_load(cursor, ptr.package, &p))
1040 return rpc_uci_status();
1041
1042 if (tb[RPC_D_SECTION])
1043 {
1044 ptr.section = blobmsg_data(tb[RPC_D_SECTION]);
1045
1046 if (tb[RPC_D_OPTIONS])
1047 err = rpc_uci_merge_delete(tb[RPC_D_OPTIONS], &ptr);
1048 else
1049 err = rpc_uci_merge_delete(tb[RPC_D_OPTION], &ptr);
1050 }
1051 else
1052 {
1053 uci_foreach_element_safe(&p->sections, tmp, e)
1054 {
1055 if (!rpc_uci_match_section(uci_to_section(e),
1056 tb[RPC_D_TYPE], tb[RPC_D_MATCH]))
1057 continue;
1058
1059 ptr.s = NULL;
1060 ptr.section = e->name;
1061
1062 if (tb[RPC_D_OPTIONS])
1063 err = rpc_uci_merge_delete(tb[RPC_D_OPTIONS], &ptr);
1064 else
1065 err = rpc_uci_merge_delete(tb[RPC_D_OPTION], &ptr);
1066 }
1067
1068 if (!err && !ptr.section)
1069 err = UBUS_STATUS_NOT_FOUND;
1070 }
1071
1072 if (!err)
1073 uci_save(cursor, p);
1074
1075 uci_unload(cursor, p);
1076
1077 return err ? err : rpc_uci_status();
1078 }
1079
1080 static int
1081 rpc_uci_rename(struct ubus_context *ctx, struct ubus_object *obj,
1082 struct ubus_request_data *req, const char *method,
1083 struct blob_attr *msg)
1084 {
1085 struct blob_attr *tb[__RPC_R_MAX];
1086 struct uci_package *p = NULL;
1087 struct uci_ptr ptr = { 0 };
1088
1089 blobmsg_parse(rpc_uci_rename_policy, __RPC_R_MAX, tb,
1090 blob_data(msg), blob_len(msg));
1091
1092 if (!tb[RPC_R_CONFIG] || !tb[RPC_R_SECTION] || !tb[RPC_R_NAME])
1093 return UBUS_STATUS_INVALID_ARGUMENT;
1094
1095 if (!rpc_uci_write_access(tb[RPC_R_SESSION], tb[RPC_R_CONFIG]))
1096 return UBUS_STATUS_PERMISSION_DENIED;
1097
1098 ptr.package = blobmsg_data(tb[RPC_R_CONFIG]);
1099 ptr.section = blobmsg_data(tb[RPC_R_SECTION]);
1100 ptr.value = blobmsg_data(tb[RPC_R_NAME]);
1101
1102 if (!rpc_uci_verify_name(ptr.value))
1103 return UBUS_STATUS_INVALID_ARGUMENT;
1104
1105 if (tb[RPC_R_OPTION])
1106 ptr.option = blobmsg_data(tb[RPC_R_OPTION]);
1107
1108 if (uci_load(cursor, ptr.package, &p))
1109 return rpc_uci_status();
1110
1111 if (uci_lookup_ptr(cursor, &ptr, NULL, true))
1112 goto out;
1113
1114 if ((ptr.option && !ptr.o) || !ptr.s)
1115 {
1116 cursor->err = UCI_ERR_NOTFOUND;
1117 goto out;
1118 }
1119
1120 if (uci_rename(cursor, &ptr))
1121 goto out;
1122
1123 uci_save(cursor, p);
1124
1125 out:
1126 uci_unload(cursor, p);
1127
1128 return rpc_uci_status();
1129 }
1130
1131 static int
1132 rpc_uci_order(struct ubus_context *ctx, struct ubus_object *obj,
1133 struct ubus_request_data *req, const char *method,
1134 struct blob_attr *msg)
1135 {
1136 struct blob_attr *tb[__RPC_O_MAX];
1137 struct blob_attr *cur;
1138 struct uci_package *p = NULL;
1139 struct uci_ptr ptr = { 0 };
1140 int rem, i = 0, err = 0;
1141
1142 blobmsg_parse(rpc_uci_order_policy, __RPC_O_MAX, tb,
1143 blob_data(msg), blob_len(msg));
1144
1145 if (!tb[RPC_O_CONFIG] || !tb[RPC_O_SECTIONS])
1146 return UBUS_STATUS_INVALID_ARGUMENT;
1147
1148 if (!rpc_uci_write_access(tb[RPC_O_SESSION], tb[RPC_O_CONFIG]))
1149 return UBUS_STATUS_PERMISSION_DENIED;
1150
1151 ptr.package = blobmsg_data(tb[RPC_O_CONFIG]);
1152
1153 if (uci_load(cursor, ptr.package, &p))
1154 return rpc_uci_status();
1155
1156 blobmsg_for_each_attr(cur, tb[RPC_O_SECTIONS], rem)
1157 {
1158 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1159 {
1160 if (!err)
1161 err = UBUS_STATUS_INVALID_ARGUMENT;
1162
1163 continue;
1164 }
1165
1166 ptr.s = NULL;
1167 ptr.section = blobmsg_data(cur);
1168
1169 if (uci_lookup_ptr(cursor, &ptr, NULL, true) || !ptr.s)
1170 {
1171 if (!err)
1172 err = UBUS_STATUS_NOT_FOUND;
1173
1174 continue;
1175 }
1176
1177 uci_reorder_section(cursor, ptr.s, i++);
1178 }
1179
1180 if (!err)
1181 uci_save(cursor, p);
1182
1183 uci_unload(cursor, p);
1184
1185 return err ? err : rpc_uci_status();
1186 }
1187
1188 static void
1189 rpc_uci_dump_change(struct uci_delta *d)
1190 {
1191 void *c;
1192 const char *types[] = {
1193 [UCI_CMD_REORDER] = "order",
1194 [UCI_CMD_REMOVE] = "remove",
1195 [UCI_CMD_RENAME] = "rename",
1196 [UCI_CMD_ADD] = "add",
1197 [UCI_CMD_LIST_ADD] = "list-add",
1198 [UCI_CMD_LIST_DEL] = "list-del",
1199 [UCI_CMD_CHANGE] = "set",
1200 };
1201
1202 if (!d->section)
1203 return;
1204
1205 c = blobmsg_open_array(&buf, NULL);
1206
1207 blobmsg_add_string(&buf, NULL, types[d->cmd]);
1208 blobmsg_add_string(&buf, NULL, d->section);
1209
1210 if (d->e.name)
1211 blobmsg_add_string(&buf, NULL, d->e.name);
1212
1213 if (d->value)
1214 {
1215 if (d->cmd == UCI_CMD_REORDER)
1216 blobmsg_add_u32(&buf, NULL, strtoul(d->value, NULL, 10));
1217 else
1218 blobmsg_add_string(&buf, NULL, d->value);
1219 }
1220
1221 blobmsg_close_array(&buf, c);
1222 }
1223
1224 static int
1225 rpc_uci_changes(struct ubus_context *ctx, struct ubus_object *obj,
1226 struct ubus_request_data *req, const char *method,
1227 struct blob_attr *msg)
1228 {
1229 struct blob_attr *tb[__RPC_C_MAX];
1230 struct uci_package *p = NULL;
1231 struct uci_element *e;
1232 char **configs;
1233 void *c, *d;
1234 int i;
1235
1236 blobmsg_parse(rpc_uci_config_policy, __RPC_C_MAX, tb,
1237 blob_data(msg), blob_len(msg));
1238
1239 if (tb[RPC_C_CONFIG])
1240 {
1241 if (!rpc_uci_read_access(tb[RPC_C_SESSION], tb[RPC_C_CONFIG]))
1242 return UBUS_STATUS_PERMISSION_DENIED;
1243
1244 if (uci_load(cursor, blobmsg_data(tb[RPC_C_CONFIG]), &p))
1245 return rpc_uci_status();
1246
1247 blob_buf_init(&buf, 0);
1248 c = blobmsg_open_array(&buf, "changes");
1249
1250 uci_foreach_element(&p->saved_delta, e)
1251 rpc_uci_dump_change(uci_to_delta(e));
1252
1253 blobmsg_close_array(&buf, c);
1254
1255 uci_unload(cursor, p);
1256
1257 ubus_send_reply(ctx, req, buf.head);
1258
1259 return rpc_uci_status();
1260 }
1261
1262 rpc_uci_set_savedir(tb[RPC_C_SESSION]);
1263
1264 if (uci_list_configs(cursor, &configs))
1265 return rpc_uci_status();
1266
1267 blob_buf_init(&buf, 0);
1268
1269 c = blobmsg_open_table(&buf, "changes");
1270
1271 for (i = 0; configs[i]; i++)
1272 {
1273 if (tb[RPC_C_SESSION] &&
1274 !rpc_session_access(blobmsg_data(tb[RPC_C_SESSION]), "uci",
1275 configs[i], "read"))
1276 continue;
1277
1278 if (uci_load(cursor, configs[i], &p))
1279 continue;
1280
1281 if (!uci_list_empty(&p->saved_delta))
1282 {
1283 d = blobmsg_open_array(&buf, configs[i]);
1284
1285 uci_foreach_element(&p->saved_delta, e)
1286 rpc_uci_dump_change(uci_to_delta(e));
1287
1288 blobmsg_close_array(&buf, d);
1289 }
1290
1291 uci_unload(cursor, p);
1292 }
1293
1294 free(configs);
1295
1296 blobmsg_close_table(&buf, c);
1297
1298 ubus_send_reply(ctx, req, buf.head);
1299
1300 return 0;
1301 }
1302
1303 static void
1304 rpc_uci_trigger_event(struct ubus_context *ctx, const char *config)
1305 {
1306 char *pkg = strdup(config);
1307 static struct blob_buf b;
1308 uint32_t id;
1309
1310 if (!ubus_lookup_id(ctx, "service", &id)) {
1311 void *c;
1312
1313 blob_buf_init(&b, 0);
1314 blobmsg_add_string(&b, "type", "config.change");
1315 c = blobmsg_open_table(&b, "data");
1316 blobmsg_add_string(&b, "package", pkg);
1317 blobmsg_close_table(&b, c);
1318 ubus_invoke(ctx, id, "event", b.head, NULL, 0, 1000);
1319 }
1320 free(pkg);
1321 }
1322
1323 static int
1324 rpc_uci_revert_commit(struct ubus_context *ctx, struct blob_attr *msg, bool commit)
1325 {
1326 struct blob_attr *tb[__RPC_C_MAX];
1327 struct uci_package *p = NULL;
1328 struct uci_ptr ptr = { 0 };
1329
1330 if (apply_sid[0])
1331 return UBUS_STATUS_PERMISSION_DENIED;
1332
1333 blobmsg_parse(rpc_uci_config_policy, __RPC_C_MAX, tb,
1334 blob_data(msg), blob_len(msg));
1335
1336 if (!tb[RPC_C_CONFIG])
1337 return UBUS_STATUS_INVALID_ARGUMENT;
1338
1339 if (!rpc_uci_write_access(tb[RPC_C_SESSION], tb[RPC_C_CONFIG]))
1340 return UBUS_STATUS_PERMISSION_DENIED;
1341
1342 ptr.package = blobmsg_data(tb[RPC_C_CONFIG]);
1343
1344 if (commit)
1345 {
1346 if (!uci_load(cursor, ptr.package, &p))
1347 {
1348 uci_commit(cursor, &p, false);
1349 uci_unload(cursor, p);
1350 rpc_uci_trigger_event(ctx, blobmsg_get_string(tb[RPC_C_CONFIG]));
1351 }
1352 }
1353 else
1354 {
1355 if (!uci_lookup_ptr(cursor, &ptr, NULL, true) && ptr.p)
1356 {
1357 uci_revert(cursor, &ptr);
1358 uci_unload(cursor, ptr.p);
1359 }
1360 }
1361
1362 return rpc_uci_status();
1363 }
1364
1365 static int
1366 rpc_uci_revert(struct ubus_context *ctx, struct ubus_object *obj,
1367 struct ubus_request_data *req, const char *method,
1368 struct blob_attr *msg)
1369 {
1370 return rpc_uci_revert_commit(ctx, msg, false);
1371 }
1372
1373 static int
1374 rpc_uci_commit(struct ubus_context *ctx, struct ubus_object *obj,
1375 struct ubus_request_data *req, const char *method,
1376 struct blob_attr *msg)
1377 {
1378 return rpc_uci_revert_commit(ctx, msg, true);
1379 }
1380
1381 static int
1382 rpc_uci_configs(struct ubus_context *ctx, struct ubus_object *obj,
1383 struct ubus_request_data *req, const char *method,
1384 struct blob_attr *msg)
1385 {
1386 char **configs;
1387 void *c;
1388 int i;
1389
1390 if (uci_list_configs(cursor, &configs))
1391 goto out;
1392
1393 blob_buf_init(&buf, 0);
1394
1395 c = blobmsg_open_array(&buf, "configs");
1396
1397 for (i = 0; configs[i]; i++)
1398 blobmsg_add_string(&buf, NULL, configs[i]);
1399
1400 free(configs);
1401
1402 blobmsg_close_array(&buf, c);
1403
1404 ubus_send_reply(ctx, req, buf.head);
1405
1406 out:
1407 return rpc_uci_status();
1408 }
1409
1410
1411 /*
1412 * Remove given delta save directory (if any).
1413 */
1414 static void
1415 rpc_uci_purge_dir(const char *path)
1416 {
1417 DIR *d;
1418 struct stat s;
1419 struct dirent *e;
1420 char file[PATH_MAX];
1421
1422 if (stat(path, &s) || !S_ISDIR(s.st_mode))
1423 return;
1424
1425 if ((d = opendir(path)) != NULL)
1426 {
1427 while ((e = readdir(d)) != NULL)
1428 {
1429 snprintf(file, sizeof(file) - 1, "%s/%s", path, e->d_name);
1430
1431 if (stat(file, &s) || !S_ISREG(s.st_mode))
1432 continue;
1433
1434 unlink(file);
1435 }
1436
1437 closedir(d);
1438
1439 rmdir(path);
1440 }
1441 }
1442
1443 static int
1444 rpc_uci_apply_config(struct ubus_context *ctx, char *config)
1445 {
1446 struct uci_package *p = NULL;
1447
1448 if (!uci_load(cursor, config, &p)) {
1449 uci_commit(cursor, &p, false);
1450 uci_unload(cursor, p);
1451 }
1452 rpc_uci_trigger_event(ctx, config);
1453
1454 return 0;
1455 }
1456
1457 static void
1458 rpc_uci_copy_file(const char *src, const char *target, const char *file)
1459 {
1460 char tmp[256];
1461 FILE *in, *out;
1462
1463 snprintf(tmp, sizeof(tmp), "%s%s", src, file);
1464 in = fopen(tmp, "rb");
1465 snprintf(tmp, sizeof(tmp), "%s%s", target, file);
1466 out = fopen(tmp, "wb+");
1467 if (in && out)
1468 while (!feof(in)) {
1469 int len = fread(tmp, 1, sizeof(tmp), in);
1470
1471 if(len > 0)
1472 fwrite(tmp, 1, len, out);
1473 }
1474 if(in)
1475 fclose(in);
1476 if(out)
1477 fclose(out);
1478 }
1479
1480 static int
1481 rpc_uci_apply_access(const char *sid, glob_t *gl)
1482 {
1483 struct stat s;
1484 int i, c = 0;
1485
1486 if (gl->gl_pathc < 3)
1487 return UBUS_STATUS_NO_DATA;
1488
1489 for (i = 0; i < gl->gl_pathc; i++) {
1490 char *config = basename(gl->gl_pathv[i]);
1491
1492 if (*config == '.')
1493 continue;
1494 if (stat(gl->gl_pathv[i], &s) || !s.st_size)
1495 continue;
1496 if (!rpc_session_access(sid, "uci", config, "write"))
1497 return UBUS_STATUS_PERMISSION_DENIED;
1498 c++;
1499 }
1500
1501 if (!c)
1502 return UBUS_STATUS_NO_DATA;
1503
1504 return 0;
1505 }
1506
1507 static void
1508 rpc_uci_do_rollback(struct ubus_context *ctx, glob_t *gl)
1509 {
1510 int i, deny;
1511 char tmp[PATH_MAX];
1512
1513 /* Test apply permission to see if the initiator session still exists.
1514 * If it does, restore the delta files as well, else just restore the
1515 * main configuration files. */
1516 deny = apply_sid[0]
1517 ? rpc_uci_apply_access(apply_sid, gl) : UBUS_STATUS_NOT_FOUND;
1518
1519 if (!deny) {
1520 snprintf(tmp, sizeof(tmp), RPC_UCI_SAVEDIR_PREFIX "%s/", apply_sid);
1521 mkdir(tmp, 0700);
1522 }
1523
1524 /* avoid merging unrelated uci changes when restoring old configs */
1525 rpc_uci_replace_savedir("/dev/null");
1526
1527 for (i = 0; i < gl->gl_pathc; i++) {
1528 char *config = basename(gl->gl_pathv[i]);
1529
1530 if (*config == '.')
1531 continue;
1532
1533 rpc_uci_copy_file(RPC_SNAPSHOT_FILES, RPC_UCI_DIR, config);
1534 rpc_uci_apply_config(ctx, config);
1535
1536 if (deny)
1537 continue;
1538
1539 rpc_uci_copy_file(RPC_SNAPSHOT_DELTA, tmp, config);
1540 }
1541
1542 rpc_uci_purge_dir(RPC_SNAPSHOT_FILES);
1543 rpc_uci_purge_dir(RPC_SNAPSHOT_DELTA);
1544
1545 uloop_timeout_cancel(&apply_timer);
1546 memset(apply_sid, 0, sizeof(apply_sid));
1547 apply_ctx = NULL;
1548 }
1549
1550 static void
1551 rpc_uci_apply_timeout(struct uloop_timeout *t)
1552 {
1553 glob_t gl;
1554 char tmp[PATH_MAX];
1555
1556 snprintf(tmp, sizeof(tmp), "%s/*", RPC_SNAPSHOT_FILES);
1557 if (glob(tmp, GLOB_PERIOD, NULL, &gl) < 0)
1558 return;
1559
1560 rpc_uci_do_rollback(apply_ctx, &gl);
1561
1562 globfree(&gl);
1563 }
1564
1565 static int
1566 rpc_uci_apply(struct ubus_context *ctx, struct ubus_object *obj,
1567 struct ubus_request_data *req, const char *method,
1568 struct blob_attr *msg)
1569 {
1570 struct blob_attr *tb[__RPC_T_MAX];
1571 int timeout = RPC_APPLY_TIMEOUT;
1572 char tmp[PATH_MAX];
1573 bool rollback = false;
1574 int ret, i;
1575 char *sid;
1576 glob_t gl;
1577
1578 blobmsg_parse(rpc_uci_apply_policy, __RPC_T_MAX, tb,
1579 blob_data(msg), blob_len(msg));
1580
1581 if (tb[RPC_T_ROLLBACK])
1582 rollback = blobmsg_get_bool(tb[RPC_T_ROLLBACK]);
1583
1584 if (apply_sid[0] && rollback)
1585 return UBUS_STATUS_PERMISSION_DENIED;
1586
1587 if (!tb[RPC_T_SESSION])
1588 return UBUS_STATUS_INVALID_ARGUMENT;
1589
1590 sid = blobmsg_data(tb[RPC_T_SESSION]);
1591
1592 if (tb[RPC_T_TIMEOUT])
1593 timeout = blobmsg_get_u32(tb[RPC_T_TIMEOUT]);
1594
1595 rpc_uci_purge_dir(RPC_SNAPSHOT_FILES);
1596 rpc_uci_purge_dir(RPC_SNAPSHOT_DELTA);
1597
1598 if (!apply_sid[0]) {
1599 rpc_uci_set_savedir(tb[RPC_T_SESSION]);
1600
1601 mkdir(RPC_SNAPSHOT_FILES, 0700);
1602 mkdir(RPC_SNAPSHOT_DELTA, 0700);
1603
1604 snprintf(tmp, sizeof(tmp), RPC_UCI_SAVEDIR_PREFIX "%s/*", sid);
1605 if (glob(tmp, GLOB_PERIOD, NULL, &gl) < 0)
1606 return UBUS_STATUS_NOT_FOUND;
1607
1608 snprintf(tmp, sizeof(tmp), RPC_UCI_SAVEDIR_PREFIX "%s/", sid);
1609
1610 ret = rpc_uci_apply_access(sid, &gl);
1611 if (ret) {
1612 globfree(&gl);
1613 return ret;
1614 }
1615
1616 /* copy SID early because rpc_uci_apply_config() will clobber buf */
1617 if (rollback)
1618 strncpy(apply_sid, sid, RPC_SID_LEN);
1619
1620 for (i = 0; i < gl.gl_pathc; i++) {
1621 char *config = basename(gl.gl_pathv[i]);
1622 struct stat s;
1623
1624 if (*config == '.')
1625 continue;
1626
1627 if (stat(gl.gl_pathv[i], &s) || !s.st_size)
1628 continue;
1629
1630 rpc_uci_copy_file(RPC_UCI_DIR, RPC_SNAPSHOT_FILES, config);
1631 rpc_uci_copy_file(tmp, RPC_SNAPSHOT_DELTA, config);
1632 rpc_uci_apply_config(ctx, config);
1633 }
1634
1635 globfree(&gl);
1636
1637 if (rollback) {
1638 apply_timer.cb = rpc_uci_apply_timeout;
1639 uloop_timeout_set(&apply_timer, timeout * 1000);
1640 apply_ctx = ctx;
1641 }
1642 }
1643
1644 return 0;
1645 }
1646
1647 static int
1648 rpc_uci_confirm(struct ubus_context *ctx, struct ubus_object *obj,
1649 struct ubus_request_data *req, const char *method,
1650 struct blob_attr *msg)
1651 {
1652 struct blob_attr *tb[__RPC_B_MAX];
1653 char *sid;
1654
1655 blobmsg_parse(rpc_uci_rollback_policy, __RPC_B_MAX, tb,
1656 blob_data(msg), blob_len(msg));
1657
1658 if (!tb[RPC_B_SESSION])
1659 return UBUS_STATUS_INVALID_ARGUMENT;
1660
1661 sid = blobmsg_data(tb[RPC_B_SESSION]);
1662
1663 if (!apply_sid[0])
1664 return UBUS_STATUS_NO_DATA;
1665
1666 if (strcmp(apply_sid, sid))
1667 return UBUS_STATUS_PERMISSION_DENIED;
1668
1669 rpc_uci_purge_dir(RPC_SNAPSHOT_FILES);
1670 rpc_uci_purge_dir(RPC_SNAPSHOT_DELTA);
1671
1672 uloop_timeout_cancel(&apply_timer);
1673 memset(apply_sid, 0, sizeof(apply_sid));
1674 apply_ctx = NULL;
1675
1676 return 0;
1677 }
1678
1679 static int
1680 rpc_uci_rollback(struct ubus_context *ctx, struct ubus_object *obj,
1681 struct ubus_request_data *req, const char *method,
1682 struct blob_attr *msg)
1683 {
1684 struct blob_attr *tb[__RPC_B_MAX];
1685 char tmp[PATH_MAX];
1686 glob_t gl;
1687 char *sid;
1688
1689 blobmsg_parse(rpc_uci_rollback_policy, __RPC_B_MAX, tb,
1690 blob_data(msg), blob_len(msg));
1691
1692 if (!apply_sid[0])
1693 return UBUS_STATUS_NO_DATA;
1694
1695 if (!tb[RPC_B_SESSION])
1696 return UBUS_STATUS_INVALID_ARGUMENT;
1697
1698 sid = blobmsg_data(tb[RPC_B_SESSION]);
1699
1700 if (strcmp(apply_sid, sid))
1701 return UBUS_STATUS_PERMISSION_DENIED;
1702
1703 snprintf(tmp, sizeof(tmp), "%s/*", RPC_SNAPSHOT_FILES);
1704 if (glob(tmp, GLOB_PERIOD, NULL, &gl) < 0)
1705 return UBUS_STATUS_NOT_FOUND;
1706
1707 rpc_uci_do_rollback(ctx, &gl);
1708
1709 globfree(&gl);
1710
1711 return 0;
1712 }
1713
1714 static int
1715 rpc_uci_reload(struct ubus_context *ctx, struct ubus_object *obj,
1716 struct ubus_request_data *req, const char *method,
1717 struct blob_attr *msg)
1718 {
1719 char * const cmd[2] = { "/sbin/reload_config", NULL };
1720
1721 if (!fork()) {
1722 /* wait for the RPC call to complete */
1723 sleep(2);
1724 return execv(cmd[0], cmd);
1725 }
1726
1727 return 0;
1728 }
1729
1730 /*
1731 * Session destroy callback to purge associated delta directory.
1732 */
1733 static void
1734 rpc_uci_purge_savedir_cb(struct rpc_session *ses, void *priv)
1735 {
1736 char path[PATH_MAX];
1737
1738 snprintf(path, sizeof(path) - 1, RPC_UCI_SAVEDIR_PREFIX "%s", ses->id);
1739 rpc_uci_purge_dir(path);
1740 }
1741
1742 /*
1743 * Removes all delta directories which match the RPC_UCI_SAVEDIR_PREFIX.
1744 * This is used to clean up garbage when starting rpcd.
1745 */
1746 void rpc_uci_purge_savedirs(void)
1747 {
1748 int i;
1749 glob_t gl;
1750
1751 if (!glob(RPC_UCI_SAVEDIR_PREFIX "*", 0, NULL, &gl))
1752 {
1753 for (i = 0; i < gl.gl_pathc; i++)
1754 rpc_uci_purge_dir(gl.gl_pathv[i]);
1755
1756 globfree(&gl);
1757 }
1758 }
1759
1760 int rpc_uci_api_init(struct ubus_context *ctx)
1761 {
1762 static const struct ubus_method uci_methods[] = {
1763 { .name = "configs", .handler = rpc_uci_configs },
1764 UBUS_METHOD("get", rpc_uci_get, rpc_uci_get_policy),
1765 UBUS_METHOD("state", rpc_uci_state, rpc_uci_get_policy),
1766 UBUS_METHOD("add", rpc_uci_add, rpc_uci_add_policy),
1767 UBUS_METHOD("set", rpc_uci_set, rpc_uci_set_policy),
1768 UBUS_METHOD("delete", rpc_uci_delete, rpc_uci_delete_policy),
1769 UBUS_METHOD("rename", rpc_uci_rename, rpc_uci_rename_policy),
1770 UBUS_METHOD("order", rpc_uci_order, rpc_uci_order_policy),
1771 UBUS_METHOD("changes", rpc_uci_changes, rpc_uci_config_policy),
1772 UBUS_METHOD("revert", rpc_uci_revert, rpc_uci_config_policy),
1773 UBUS_METHOD("commit", rpc_uci_commit, rpc_uci_config_policy),
1774 UBUS_METHOD("apply", rpc_uci_apply, rpc_uci_apply_policy),
1775 UBUS_METHOD("confirm", rpc_uci_confirm, rpc_uci_rollback_policy),
1776 UBUS_METHOD("rollback", rpc_uci_rollback, rpc_uci_rollback_policy),
1777 UBUS_METHOD_NOARG("reload_config", rpc_uci_reload),
1778 };
1779
1780 static struct ubus_object_type uci_type =
1781 UBUS_OBJECT_TYPE("rpcd-plugin-uci", uci_methods);
1782
1783 static struct ubus_object obj = {
1784 .name = "uci",
1785 .type = &uci_type,
1786 .methods = uci_methods,
1787 .n_methods = ARRAY_SIZE(uci_methods),
1788 };
1789
1790 static struct rpc_session_cb cb = {
1791 .cb = rpc_uci_purge_savedir_cb
1792 };
1793
1794 cursor = uci_alloc_context();
1795
1796 if (!cursor)
1797 return UBUS_STATUS_UNKNOWN_ERROR;
1798
1799 rpc_session_destroy_cb(&cb);
1800
1801 return ubus_add_object(ctx, &obj);
1802 }
OpenWrt ubus RPC daemon