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Sources/rpcd/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.o = NULL;
738                         ptr.option = blobmsg_name(cur);
739 
740                         if (!rpc_uci_verify_name(ptr.option))
741                         {
742                                 if (!err)
743                                         err = UBUS_STATUS_INVALID_ARGUMENT;
744 
745                                 continue;
746                         }
747 
748                         if (rpc_uci_lookup(&ptr) || !ptr.s)
749                         {
750                                 if (!err)
751                                         err = UBUS_STATUS_NOT_FOUND;
752 
753                                 continue;
754                         }
755 
756                         switch (blobmsg_type(cur))
757                         {
758                         case BLOBMSG_TYPE_ARRAY:
759                                 blobmsg_for_each_attr(elem, cur, rem2)
760                                 {
761                                         if (!rpc_uci_format_blob(elem, &ptr.value))
762                                         {
763                                                 if (!err)
764                                                         err = UBUS_STATUS_INVALID_ARGUMENT;
765 
766                                                 continue;
767                                         }
768 
769                                         uci_add_list(cursor, &ptr);
770                                 }
771 
772                                 break;
773 
774                         default:
775                                 if (!rpc_uci_format_blob(cur, &ptr.value))
776                                 {
777                                         if (!err)
778                                                 err = UBUS_STATUS_INVALID_ARGUMENT;
779                                 }
780                                 else
781                                 {
782                                         uci_set(cursor, &ptr);
783                                 }
784 
785                                 break;
786                         }
787                 }
788         }
789 
790         if (!err)
791         {
792                 uci_save(cursor, p);
793 
794                 blob_buf_init(&buf, 0);
795                 blobmsg_add_string(&buf, "section", ptr.section);
796                 ubus_send_reply(ctx, req, buf.head);
797         }
798 
799 out:
800         uci_unload(cursor, p);
801 
802         return err ? err : rpc_uci_status();
803 }
804 
805 /*
806  * Turn value from a blob attribute into uci set operation
807  *  1) if the blob is of type array, delete existing option (if any) and
808  *     emit uci add_list operations for each element
809  *  2) if the blob is not an array but an option of type list exists,
810  *     delete existing list and emit uci set operation for the blob value
811  *  3) in all other cases only emit a set operation if there is no existing
812  *     option of if the existing options value differs from the blob value
813  */
814 static int
815 rpc_uci_merge_set(struct blob_attr *opt, struct uci_ptr *ptr)
816 {
817         struct blob_attr *cur;
818         int rem, rv;
819 
820         ptr->flags = 0;
821         ptr->o = NULL;
822         ptr->option = blobmsg_name(opt);
823         ptr->value = NULL;
824 
825         if (!rpc_uci_verify_name(ptr->option))
826                 return UBUS_STATUS_INVALID_ARGUMENT;
827 
828         if (rpc_uci_lookup(ptr) || !ptr->s)
829                 return UBUS_STATUS_NOT_FOUND;
830 
831         if (blobmsg_type(opt) == BLOBMSG_TYPE_ARRAY)
832         {
833                 if (ptr->o)
834                         uci_delete(cursor, ptr);
835 
836                 rv = UBUS_STATUS_INVALID_ARGUMENT;
837 
838                 blobmsg_for_each_attr(cur, opt, rem)
839                 {
840                         if (!rpc_uci_format_blob(cur, &ptr->value))
841                                 continue;
842 
843                         uci_add_list(cursor, ptr);
844                         rv = 0;
845                 }
846 
847                 return rv;
848         }
849         else if (ptr->o && ptr->o->type == UCI_TYPE_LIST)
850         {
851                 uci_delete(cursor, ptr);
852 
853                 if (!rpc_uci_format_blob(opt, &ptr->value))
854                         return UBUS_STATUS_INVALID_ARGUMENT;
855 
856                 uci_set(cursor, ptr);
857         }
858         else
859         {
860                 if (!rpc_uci_format_blob(opt, &ptr->value))
861                         return UBUS_STATUS_INVALID_ARGUMENT;
862 
863                 if (!ptr->o || !ptr->o->v.string || strcmp(ptr->o->v.string, ptr->value))
864                         uci_set(cursor, ptr);
865         }
866 
867         return 0;
868 }
869 
870 static int
871 rpc_uci_set(struct ubus_context *ctx, struct ubus_object *obj,
872             struct ubus_request_data *req, const char *method,
873             struct blob_attr *msg)
874 {
875         struct blob_attr *tb[__RPC_S_MAX];
876         struct blob_attr *cur;
877         struct uci_package *p = NULL;
878         struct uci_element *e;
879         struct uci_ptr ptr = { 0 };
880         int rem, rv, err = 0;
881 
882         blobmsg_parse(rpc_uci_set_policy, __RPC_S_MAX, tb,
883                       blob_data(msg), blob_len(msg));
884 
885         if (!tb[RPC_S_CONFIG] || !tb[RPC_S_VALUES] ||
886                 (!tb[RPC_S_SECTION] && !tb[RPC_S_TYPE] && !tb[RPC_S_MATCH]))
887                 return UBUS_STATUS_INVALID_ARGUMENT;
888 
889         if (!rpc_uci_write_access(tb[RPC_S_SESSION], tb[RPC_S_CONFIG]))
890                 return UBUS_STATUS_PERMISSION_DENIED;
891 
892         if (tb[RPC_S_SECTION] &&
893             !rpc_uci_verify_section(blobmsg_data(tb[RPC_S_SECTION])))
894                 return UBUS_STATUS_INVALID_ARGUMENT;
895 
896         ptr.package = blobmsg_data(tb[RPC_S_CONFIG]);
897 
898         if (uci_load(cursor, ptr.package, &p))
899                 return rpc_uci_status();
900 
901         if (tb[RPC_S_SECTION])
902         {
903                 ptr.section = blobmsg_data(tb[RPC_S_SECTION]);
904                 blobmsg_for_each_attr(cur, tb[RPC_S_VALUES], rem)
905                 {
906                         rv = rpc_uci_merge_set(cur, &ptr);
907 
908                         if (rv)
909                                 err = rv;
910                 }
911         }
912         else
913         {
914                 uci_foreach_element(&p->sections, e)
915                 {
916                         if (!rpc_uci_match_section(uci_to_section(e),
917                                                    tb[RPC_S_TYPE], tb[RPC_S_MATCH]))
918                                 continue;
919 
920                         ptr.s = NULL;
921                         ptr.section = e->name;
922 
923                         blobmsg_for_each_attr(cur, tb[RPC_S_VALUES], rem)
924                         {
925                                 rv = rpc_uci_merge_set(cur, &ptr);
926 
927                                 if (rv)
928                                         err = rv;
929                         }
930                 }
931         }
932 
933         if (!err && !ptr.s)
934                 err = UBUS_STATUS_NOT_FOUND;
935 
936         if (!err)
937                 uci_save(cursor, p);
938 
939         uci_unload(cursor, p);
940 
941         return err ? err : rpc_uci_status();
942 }
943 
944 /*
945  * Delete option or section from uci specified by given blob attribute pointer
946  *  1) if the blob is of type array, delete any option named after each element
947  *  2) if the blob is of type string, delete the option named after its value
948  *  3) if the blob is NULL, delete entire section
949  */
950 static int
951 rpc_uci_merge_delete(struct blob_attr *opt, struct uci_ptr *ptr)
952 {
953         struct blob_attr *cur;
954         int rem, rv;
955 
956         if (rpc_uci_lookup(ptr) || !ptr->s)
957                 return UBUS_STATUS_NOT_FOUND;
958 
959         if (!opt)
960         {
961                 ptr->o = NULL;
962                 ptr->option = NULL;
963 
964                 uci_delete(cursor, ptr);
965                 return 0;
966         }
967         else if (blobmsg_type(opt) == BLOBMSG_TYPE_ARRAY)
968         {
969                 rv = UBUS_STATUS_NOT_FOUND;
970 
971                 blobmsg_for_each_attr(cur, opt, rem)
972                 {
973                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
974                                 continue;
975 
976                         ptr->o = NULL;
977                         ptr->option = blobmsg_data(cur);
978 
979                         if (rpc_uci_lookup(ptr) || !ptr->o)
980                                 continue;
981 
982                         uci_delete(cursor, ptr);
983                         rv = 0;
984                 }
985 
986                 return rv;
987         }
988         else if (blobmsg_type(opt) == BLOBMSG_TYPE_STRING)
989         {
990                 ptr->o = NULL;
991                 ptr->option = blobmsg_data(opt);
992 
993                 if (rpc_uci_lookup(ptr) || !ptr->o)
994                         return UBUS_STATUS_NOT_FOUND;
995 
996                 uci_delete(cursor, ptr);
997                 return 0;
998         }
999 
1000         return UBUS_STATUS_INVALID_ARGUMENT;
1001 }
1002 
1003 static int
1004 rpc_uci_delete(struct ubus_context *ctx, struct ubus_object *obj,
1005                struct ubus_request_data *req, const char *method,
1006                struct blob_attr *msg)
1007 {
1008         struct blob_attr *tb[__RPC_D_MAX];
1009         struct uci_package *p = NULL;
1010         struct uci_element *e, *tmp;
1011         struct uci_ptr ptr = { 0 };
1012         int err = 0;
1013 
1014         blobmsg_parse(rpc_uci_delete_policy, __RPC_D_MAX, tb,
1015                       blob_data(msg), blob_len(msg));
1016 
1017         if (!tb[RPC_D_CONFIG] ||
1018                 (!tb[RPC_D_SECTION] && !tb[RPC_D_TYPE] && !tb[RPC_D_MATCH]))
1019                 return UBUS_STATUS_INVALID_ARGUMENT;
1020 
1021         if (!rpc_uci_write_access(tb[RPC_D_SESSION], tb[RPC_D_CONFIG]))
1022                 return UBUS_STATUS_PERMISSION_DENIED;
1023 
1024         if (tb[RPC_D_TYPE] &&
1025             !rpc_uci_verify_type(blobmsg_data(tb[RPC_D_TYPE])))
1026                 return UBUS_STATUS_INVALID_ARGUMENT;
1027 
1028         if (tb[RPC_D_SECTION] &&
1029             !rpc_uci_verify_section(blobmsg_data(tb[RPC_D_SECTION])))
1030                 return UBUS_STATUS_INVALID_ARGUMENT;
1031 
1032         ptr.package = blobmsg_data(tb[RPC_D_CONFIG]);
1033 
1034         if (uci_load(cursor, ptr.package, &p))
1035                 return rpc_uci_status();
1036 
1037         if (tb[RPC_D_SECTION])
1038         {
1039                 ptr.section = blobmsg_data(tb[RPC_D_SECTION]);
1040 
1041                 if (tb[RPC_D_OPTIONS])
1042                         err = rpc_uci_merge_delete(tb[RPC_D_OPTIONS], &ptr);
1043                 else
1044                         err = rpc_uci_merge_delete(tb[RPC_D_OPTION], &ptr);
1045         }
1046         else
1047         {
1048                 uci_foreach_element_safe(&p->sections, tmp, e)
1049                 {
1050                         if (!rpc_uci_match_section(uci_to_section(e),
1051                                                    tb[RPC_D_TYPE], tb[RPC_D_MATCH]))
1052                                 continue;
1053 
1054                         ptr.s = NULL;
1055                         ptr.section = e->name;
1056 
1057                         if (tb[RPC_D_OPTIONS])
1058                                 err = rpc_uci_merge_delete(tb[RPC_D_OPTIONS], &ptr);
1059                         else
1060                                 err = rpc_uci_merge_delete(tb[RPC_D_OPTION], &ptr);
1061                 }
1062 
1063                 if (!err && !ptr.section)
1064                         err = UBUS_STATUS_NOT_FOUND;
1065         }
1066 
1067         if (!err)
1068                 uci_save(cursor, p);
1069 
1070         uci_unload(cursor, p);
1071 
1072         return err ? err : rpc_uci_status();
1073 }
1074 
1075 static int
1076 rpc_uci_rename(struct ubus_context *ctx, struct ubus_object *obj,
1077                struct ubus_request_data *req, const char *method,
1078                struct blob_attr *msg)
1079 {
1080         struct blob_attr *tb[__RPC_R_MAX];
1081         struct uci_package *p = NULL;
1082         struct uci_ptr ptr = { 0 };
1083 
1084         blobmsg_parse(rpc_uci_rename_policy, __RPC_R_MAX, tb,
1085                       blob_data(msg), blob_len(msg));
1086 
1087         if (!tb[RPC_R_CONFIG] || !tb[RPC_R_SECTION] || !tb[RPC_R_NAME])
1088                 return UBUS_STATUS_INVALID_ARGUMENT;
1089 
1090         if (!rpc_uci_write_access(tb[RPC_R_SESSION], tb[RPC_R_CONFIG]))
1091                 return UBUS_STATUS_PERMISSION_DENIED;
1092 
1093         ptr.package = blobmsg_data(tb[RPC_R_CONFIG]);
1094         ptr.section = blobmsg_data(tb[RPC_R_SECTION]);
1095         ptr.value   = blobmsg_data(tb[RPC_R_NAME]);
1096 
1097         if (!rpc_uci_verify_name(ptr.value))
1098                 return UBUS_STATUS_INVALID_ARGUMENT;
1099 
1100         if (tb[RPC_R_OPTION])
1101                 ptr.option = blobmsg_data(tb[RPC_R_OPTION]);
1102 
1103         if (uci_load(cursor, ptr.package, &p))
1104                 return rpc_uci_status();
1105 
1106         if (uci_lookup_ptr(cursor, &ptr, NULL, true))
1107                 goto out;
1108 
1109         if ((ptr.option && !ptr.o) || !ptr.s)
1110         {
1111                 cursor->err = UCI_ERR_NOTFOUND;
1112                 goto out;
1113         }
1114 
1115         if (uci_rename(cursor, &ptr))
1116                 goto out;
1117 
1118         uci_save(cursor, p);
1119 
1120 out:
1121         uci_unload(cursor, p);
1122 
1123         return rpc_uci_status();
1124 }
1125 
1126 static int
1127 rpc_uci_order(struct ubus_context *ctx, struct ubus_object *obj,
1128               struct ubus_request_data *req, const char *method,
1129               struct blob_attr *msg)
1130 {
1131         struct blob_attr *tb[__RPC_O_MAX];
1132         struct blob_attr *cur;
1133         struct uci_package *p = NULL;
1134         struct uci_ptr ptr = { 0 };
1135         int rem, i = 0, err = 0;
1136 
1137         blobmsg_parse(rpc_uci_order_policy, __RPC_O_MAX, tb,
1138                       blob_data(msg), blob_len(msg));
1139 
1140         if (!tb[RPC_O_CONFIG] || !tb[RPC_O_SECTIONS])
1141                 return UBUS_STATUS_INVALID_ARGUMENT;
1142 
1143         if (!rpc_uci_write_access(tb[RPC_O_SESSION], tb[RPC_O_CONFIG]))
1144                 return UBUS_STATUS_PERMISSION_DENIED;
1145 
1146         ptr.package = blobmsg_data(tb[RPC_O_CONFIG]);
1147 
1148         if (uci_load(cursor, ptr.package, &p))
1149                 return rpc_uci_status();
1150 
1151         blobmsg_for_each_attr(cur, tb[RPC_O_SECTIONS], rem)
1152         {
1153                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
1154                 {
1155                         if (!err)
1156                                 err = UBUS_STATUS_INVALID_ARGUMENT;
1157 
1158                         continue;
1159                 }
1160 
1161                 ptr.s = NULL;
1162                 ptr.section = blobmsg_data(cur);
1163 
1164                 if (uci_lookup_ptr(cursor, &ptr, NULL, true) || !ptr.s)
1165                 {
1166                         if (!err)
1167                                 err = UBUS_STATUS_NOT_FOUND;
1168 
1169                         continue;
1170                 }
1171 
1172                 uci_reorder_section(cursor, ptr.s, i++);
1173         }
1174 
1175         if (!err)
1176                 uci_save(cursor, p);
1177 
1178         uci_unload(cursor, p);
1179 
1180         return err ? err : rpc_uci_status();
1181 }
1182 
1183 static void
1184 rpc_uci_dump_change(struct uci_delta *d)
1185 {
1186         void *c;
1187         const char *types[] = {
1188                 [UCI_CMD_REORDER]  = "order",
1189                 [UCI_CMD_REMOVE]   = "remove",
1190                 [UCI_CMD_RENAME]   = "rename",
1191                 [UCI_CMD_ADD]      = "add",
1192                 [UCI_CMD_LIST_ADD] = "list-add",
1193                 [UCI_CMD_LIST_DEL] = "list-del",
1194                 [UCI_CMD_CHANGE]   = "set",
1195         };
1196 
1197         if (!d->section)
1198                 return;
1199 
1200         c = blobmsg_open_array(&buf, NULL);
1201 
1202         blobmsg_add_string(&buf, NULL, types[d->cmd]);
1203         blobmsg_add_string(&buf, NULL, d->section);
1204 
1205         if (d->e.name)
1206                 blobmsg_add_string(&buf, NULL, d->e.name);
1207 
1208         if (d->value)
1209         {
1210                 if (d->cmd == UCI_CMD_REORDER)
1211                         blobmsg_add_u32(&buf, NULL, strtoul(d->value, NULL, 10));
1212                 else
1213                         blobmsg_add_string(&buf, NULL, d->value);
1214         }
1215 
1216         blobmsg_close_array(&buf, c);
1217 }
1218 
1219 static int
1220 rpc_uci_changes(struct ubus_context *ctx, struct ubus_object *obj,
1221                 struct ubus_request_data *req, const char *method,
1222                 struct blob_attr *msg)
1223 {
1224         struct blob_attr *tb[__RPC_C_MAX];
1225         struct uci_package *p = NULL;
1226         struct uci_element *e;
1227         char **configs;
1228         void *c, *d;
1229         int i;
1230 
1231         blobmsg_parse(rpc_uci_config_policy, __RPC_C_MAX, tb,
1232                       blob_data(msg), blob_len(msg));
1233 
1234         if (tb[RPC_C_CONFIG])
1235         {
1236                 if (!rpc_uci_read_access(tb[RPC_C_SESSION], tb[RPC_C_CONFIG]))
1237                         return UBUS_STATUS_PERMISSION_DENIED;
1238 
1239                 if (uci_load(cursor, blobmsg_data(tb[RPC_C_CONFIG]), &p))
1240                         return rpc_uci_status();
1241 
1242                 blob_buf_init(&buf, 0);
1243                 c = blobmsg_open_array(&buf, "changes");
1244 
1245                 uci_foreach_element(&p->saved_delta, e)
1246                         rpc_uci_dump_change(uci_to_delta(e));
1247 
1248                 blobmsg_close_array(&buf, c);
1249 
1250                 uci_unload(cursor, p);
1251 
1252                 ubus_send_reply(ctx, req, buf.head);
1253 
1254                 return rpc_uci_status();
1255         }
1256 
1257         rpc_uci_set_savedir(tb[RPC_C_SESSION]);
1258 
1259         if (uci_list_configs(cursor, &configs))
1260                 return rpc_uci_status();
1261 
1262         blob_buf_init(&buf, 0);
1263 
1264         c = blobmsg_open_table(&buf, "changes");
1265 
1266         for (i = 0; configs[i]; i++)
1267         {
1268                 if (tb[RPC_C_SESSION] &&
1269                     !rpc_session_access(blobmsg_data(tb[RPC_C_SESSION]), "uci",
1270                                         configs[i], "read"))
1271                         continue;
1272 
1273                 if (uci_load(cursor, configs[i], &p))
1274                         continue;
1275 
1276                 if (!uci_list_empty(&p->saved_delta))
1277                 {
1278                         d = blobmsg_open_array(&buf, configs[i]);
1279 
1280                         uci_foreach_element(&p->saved_delta, e)
1281                                 rpc_uci_dump_change(uci_to_delta(e));
1282 
1283                         blobmsg_close_array(&buf, d);
1284                 }
1285 
1286                 uci_unload(cursor, p);
1287         }
1288 
1289         free(configs);
1290 
1291         blobmsg_close_table(&buf, c);
1292 
1293         ubus_send_reply(ctx, req, buf.head);
1294 
1295         return 0;
1296 }
1297 
1298 static void
1299 rpc_uci_trigger_event(struct ubus_context *ctx, const char *config)
1300 {
1301         char *pkg = strdup(config);
1302         static struct blob_buf b;
1303         uint32_t id;
1304 
1305         if (!ubus_lookup_id(ctx, "service", &id)) {
1306                 void *c;
1307 
1308                 blob_buf_init(&b, 0);
1309                 blobmsg_add_string(&b, "type", "config.change");
1310                 c = blobmsg_open_table(&b, "data");
1311                 blobmsg_add_string(&b, "package", pkg);
1312                 blobmsg_close_table(&b, c);
1313                 ubus_invoke(ctx, id, "event", b.head, NULL, 0, 1000);
1314         }
1315         free(pkg);
1316 }
1317 
1318 static int
1319 rpc_uci_revert_commit(struct ubus_context *ctx, struct blob_attr *msg, bool commit)
1320 {
1321         struct blob_attr *tb[__RPC_C_MAX];
1322         struct uci_package *p = NULL;
1323         struct uci_ptr ptr = { 0 };
1324 
1325         if (apply_sid[0])
1326                 return UBUS_STATUS_PERMISSION_DENIED;
1327 
1328         blobmsg_parse(rpc_uci_config_policy, __RPC_C_MAX, tb,
1329                       blob_data(msg), blob_len(msg));
1330 
1331         if (!tb[RPC_C_CONFIG])
1332                 return UBUS_STATUS_INVALID_ARGUMENT;
1333 
1334         if (!rpc_uci_write_access(tb[RPC_C_SESSION], tb[RPC_C_CONFIG]))
1335                 return UBUS_STATUS_PERMISSION_DENIED;
1336 
1337         ptr.package = blobmsg_data(tb[RPC_C_CONFIG]);
1338 
1339         if (commit)
1340         {
1341                 if (!uci_load(cursor, ptr.package, &p))
1342                 {
1343                         uci_commit(cursor, &p, false);
1344                         uci_unload(cursor, p);
1345                         rpc_uci_trigger_event(ctx, blobmsg_get_string(tb[RPC_C_CONFIG]));
1346                 }
1347         }
1348         else
1349         {
1350                 if (!uci_lookup_ptr(cursor, &ptr, NULL, true) && ptr.p)
1351                 {
1352                         uci_revert(cursor, &ptr);
1353                         uci_unload(cursor, ptr.p);
1354                 }
1355         }
1356 
1357         return rpc_uci_status();
1358 }
1359 
1360 static int
1361 rpc_uci_revert(struct ubus_context *ctx, struct ubus_object *obj,
1362                struct ubus_request_data *req, const char *method,
1363                struct blob_attr *msg)
1364 {
1365         return rpc_uci_revert_commit(ctx, msg, false);
1366 }
1367 
1368 static int
1369 rpc_uci_commit(struct ubus_context *ctx, struct ubus_object *obj,
1370                struct ubus_request_data *req, const char *method,
1371                struct blob_attr *msg)
1372 {
1373         return rpc_uci_revert_commit(ctx, msg, true);
1374 }
1375 
1376 static int
1377 rpc_uci_configs(struct ubus_context *ctx, struct ubus_object *obj,
1378                 struct ubus_request_data *req, const char *method,
1379                 struct blob_attr *msg)
1380 {
1381         char **configs;
1382         void *c;
1383         int i;
1384 
1385         if (uci_list_configs(cursor, &configs))
1386                 goto out;
1387 
1388         blob_buf_init(&buf, 0);
1389 
1390         c = blobmsg_open_array(&buf, "configs");
1391 
1392         for (i = 0; configs[i]; i++)
1393                 blobmsg_add_string(&buf, NULL, configs[i]);
1394 
1395         free(configs);
1396 
1397         blobmsg_close_array(&buf, c);
1398 
1399         ubus_send_reply(ctx, req, buf.head);
1400 
1401 out:
1402         return rpc_uci_status();
1403 }
1404 
1405 
1406 /*
1407  * Remove given delta save directory (if any).
1408  */
1409 static void
1410 rpc_uci_purge_dir(const char *path)
1411 {
1412         DIR *d;
1413         struct stat s;
1414         struct dirent *e;
1415         char file[PATH_MAX];
1416 
1417         if (stat(path, &s) || !S_ISDIR(s.st_mode))
1418                 return;
1419 
1420         if ((d = opendir(path)) != NULL)
1421         {
1422                 while ((e = readdir(d)) != NULL)
1423                 {
1424                         snprintf(file, sizeof(file) - 1, "%s/%s", path, e->d_name);
1425 
1426                         if (stat(file, &s) || !S_ISREG(s.st_mode))
1427                                 continue;
1428 
1429                         unlink(file);
1430                 }
1431 
1432                 closedir(d);
1433 
1434                 rmdir(path);
1435         }
1436 }
1437 
1438 static int
1439 rpc_uci_apply_config(struct ubus_context *ctx, char *config)
1440 {
1441         struct uci_package *p = NULL;
1442 
1443         if (!uci_load(cursor, config, &p)) {
1444                 uci_commit(cursor, &p, false);
1445                 uci_unload(cursor, p);
1446         }
1447         rpc_uci_trigger_event(ctx, config);
1448 
1449         return 0;
1450 }
1451 
1452 static void
1453 rpc_uci_copy_file(const char *src, const char *target, const char *file)
1454 {
1455         char tmp[256];
1456         FILE *in, *out;
1457 
1458         snprintf(tmp, sizeof(tmp), "%s%s", src, file);
1459         in = fopen(tmp, "rb");
1460         snprintf(tmp, sizeof(tmp), "%s%s", target, file);
1461         out = fopen(tmp, "wb+");
1462         if (in && out)
1463                 while (!feof(in)) {
1464                         int len = fread(tmp, 1, sizeof(tmp), in);
1465 
1466                         if(len > 0)
1467                                 fwrite(tmp, 1, len, out);
1468                 }
1469         if(in)
1470                 fclose(in);
1471         if(out)
1472                 fclose(out);
1473 }
1474 
1475 static int
1476 rpc_uci_apply_access(const char *sid, glob_t *gl)
1477 {
1478         struct stat s;
1479         int i, c = 0;
1480 
1481         if (gl->gl_pathc < 3)
1482                 return UBUS_STATUS_NO_DATA;
1483 
1484         for (i = 0; i < gl->gl_pathc; i++) {
1485                 char *config = basename(gl->gl_pathv[i]);
1486 
1487                 if (*config == '.')
1488                         continue;
1489                 if (stat(gl->gl_pathv[i], &s) || !s.st_size)
1490                         continue;
1491                 if (!rpc_session_access(sid, "uci", config, "write"))
1492                         return UBUS_STATUS_PERMISSION_DENIED;
1493                 c++;
1494         }
1495 
1496         if (!c)
1497                 return UBUS_STATUS_NO_DATA;
1498 
1499         return 0;
1500 }
1501 
1502 static void
1503 rpc_uci_do_rollback(struct ubus_context *ctx, glob_t *gl)
1504 {
1505         int i, deny;
1506         char tmp[PATH_MAX];
1507 
1508         /* Test apply permission to see if the initiator session still exists.
1509          * If it does, restore the delta files as well, else just restore the
1510          * main configuration files. */
1511         deny = apply_sid[0]
1512                 ? rpc_uci_apply_access(apply_sid, gl) : UBUS_STATUS_NOT_FOUND;
1513 
1514         if (!deny) {
1515                 snprintf(tmp, sizeof(tmp), RPC_UCI_SAVEDIR_PREFIX "%s/", apply_sid);
1516                 mkdir(tmp, 0700);
1517         }
1518 
1519         /* avoid merging unrelated uci changes when restoring old configs */
1520         rpc_uci_replace_savedir("/dev/null");
1521 
1522         for (i = 0; i < gl->gl_pathc; i++) {
1523                 char *config = basename(gl->gl_pathv[i]);
1524 
1525                 if (*config == '.')
1526                         continue;
1527 
1528                 rpc_uci_copy_file(RPC_SNAPSHOT_FILES, RPC_UCI_DIR, config);
1529                 rpc_uci_apply_config(ctx, config);
1530 
1531                 if (deny)
1532                         continue;
1533 
1534                 rpc_uci_copy_file(RPC_SNAPSHOT_DELTA, tmp, config);
1535         }
1536 
1537         rpc_uci_purge_dir(RPC_SNAPSHOT_FILES);
1538         rpc_uci_purge_dir(RPC_SNAPSHOT_DELTA);
1539 
1540         uloop_timeout_cancel(&apply_timer);
1541         memset(apply_sid, 0, sizeof(apply_sid));
1542         apply_ctx = NULL;
1543 }
1544 
1545 static void
1546 rpc_uci_apply_timeout(struct uloop_timeout *t)
1547 {
1548         glob_t gl;
1549         char tmp[PATH_MAX];
1550 
1551         snprintf(tmp, sizeof(tmp), "%s/*", RPC_SNAPSHOT_FILES);
1552         if (glob(tmp, GLOB_PERIOD, NULL, &gl) < 0)
1553                 return;
1554 
1555         rpc_uci_do_rollback(apply_ctx, &gl);
1556 
1557         globfree(&gl);
1558 }
1559 
1560 static int
1561 rpc_uci_apply(struct ubus_context *ctx, struct ubus_object *obj,
1562               struct ubus_request_data *req, const char *method,
1563               struct blob_attr *msg)
1564 {
1565         struct blob_attr *tb[__RPC_T_MAX];
1566         int timeout = RPC_APPLY_TIMEOUT;
1567         char tmp[PATH_MAX];
1568         bool rollback = false;
1569         int ret, i;
1570         char *sid;
1571         glob_t gl;
1572 
1573         blobmsg_parse(rpc_uci_apply_policy, __RPC_T_MAX, tb,
1574                       blob_data(msg), blob_len(msg));
1575 
1576         if (tb[RPC_T_ROLLBACK])
1577                 rollback = blobmsg_get_bool(tb[RPC_T_ROLLBACK]);
1578 
1579         if (apply_sid[0] && rollback)
1580                 return UBUS_STATUS_PERMISSION_DENIED;
1581 
1582         if (!tb[RPC_T_SESSION])
1583                 return UBUS_STATUS_INVALID_ARGUMENT;
1584 
1585         sid = blobmsg_data(tb[RPC_T_SESSION]);
1586 
1587         if (tb[RPC_T_TIMEOUT])
1588                 timeout = blobmsg_get_u32(tb[RPC_T_TIMEOUT]);
1589 
1590         rpc_uci_purge_dir(RPC_SNAPSHOT_FILES);
1591         rpc_uci_purge_dir(RPC_SNAPSHOT_DELTA);
1592 
1593         if (!apply_sid[0]) {
1594                 rpc_uci_set_savedir(tb[RPC_T_SESSION]);
1595 
1596                 mkdir(RPC_SNAPSHOT_FILES, 0700);
1597                 mkdir(RPC_SNAPSHOT_DELTA, 0700);
1598 
1599                 snprintf(tmp, sizeof(tmp), RPC_UCI_SAVEDIR_PREFIX "%s/*", sid);
1600                 if (glob(tmp, GLOB_PERIOD, NULL, &gl) < 0)
1601                         return UBUS_STATUS_NOT_FOUND;
1602 
1603                 snprintf(tmp, sizeof(tmp), RPC_UCI_SAVEDIR_PREFIX "%s/", sid);
1604 
1605                 ret = rpc_uci_apply_access(sid, &gl);
1606                 if (ret) {
1607                         globfree(&gl);
1608                         return ret;
1609                 }
1610 
1611                 /* copy SID early because rpc_uci_apply_config() will clobber buf */
1612                 if (rollback)
1613                         strncpy(apply_sid, sid, RPC_SID_LEN);
1614 
1615                 for (i = 0; i < gl.gl_pathc; i++) {
1616                         char *config = basename(gl.gl_pathv[i]);
1617                         struct stat s;
1618 
1619                         if (*config == '.')
1620                                 continue;
1621 
1622                         if (stat(gl.gl_pathv[i], &s) || !s.st_size)
1623                                 continue;
1624 
1625                         rpc_uci_copy_file(RPC_UCI_DIR, RPC_SNAPSHOT_FILES, config);
1626                         rpc_uci_copy_file(tmp, RPC_SNAPSHOT_DELTA, config);
1627                         rpc_uci_apply_config(ctx, config);
1628                 }
1629 
1630                 globfree(&gl);
1631 
1632                 if (rollback) {
1633                         apply_timer.cb = rpc_uci_apply_timeout;
1634                         uloop_timeout_set(&apply_timer, timeout * 1000);
1635                         apply_ctx = ctx;
1636                 }
1637         }
1638 
1639         return 0;
1640 }
1641 
1642 static int
1643 rpc_uci_confirm(struct ubus_context *ctx, struct ubus_object *obj,
1644                 struct ubus_request_data *req, const char *method,
1645                 struct blob_attr *msg)
1646 {
1647         struct blob_attr *tb[__RPC_B_MAX];
1648         char *sid;
1649 
1650         blobmsg_parse(rpc_uci_rollback_policy, __RPC_B_MAX, tb,
1651                       blob_data(msg), blob_len(msg));
1652 
1653         if (!tb[RPC_B_SESSION])
1654                 return UBUS_STATUS_INVALID_ARGUMENT;
1655 
1656         sid = blobmsg_data(tb[RPC_B_SESSION]);
1657 
1658         if (!apply_sid[0])
1659                 return UBUS_STATUS_NO_DATA;
1660 
1661         if (strcmp(apply_sid, sid))
1662                 return UBUS_STATUS_PERMISSION_DENIED;
1663 
1664         rpc_uci_purge_dir(RPC_SNAPSHOT_FILES);
1665         rpc_uci_purge_dir(RPC_SNAPSHOT_DELTA);
1666 
1667         uloop_timeout_cancel(&apply_timer);
1668         memset(apply_sid, 0, sizeof(apply_sid));
1669         apply_ctx = NULL;
1670 
1671         return 0;
1672 }
1673 
1674 static int
1675 rpc_uci_rollback(struct ubus_context *ctx, struct ubus_object *obj,
1676                  struct ubus_request_data *req, const char *method,
1677                  struct blob_attr *msg)
1678 {
1679         struct blob_attr *tb[__RPC_B_MAX];
1680         char tmp[PATH_MAX];
1681         glob_t gl;
1682         char *sid;
1683 
1684         blobmsg_parse(rpc_uci_rollback_policy, __RPC_B_MAX, tb,
1685                       blob_data(msg), blob_len(msg));
1686 
1687         if (!apply_sid[0])
1688                 return UBUS_STATUS_NO_DATA;
1689 
1690         if (!tb[RPC_B_SESSION])
1691                 return UBUS_STATUS_INVALID_ARGUMENT;
1692 
1693         sid = blobmsg_data(tb[RPC_B_SESSION]);
1694 
1695         if (strcmp(apply_sid, sid))
1696                 return UBUS_STATUS_PERMISSION_DENIED;
1697 
1698         snprintf(tmp, sizeof(tmp), "%s/*", RPC_SNAPSHOT_FILES);
1699         if (glob(tmp, GLOB_PERIOD, NULL, &gl) < 0)
1700                 return UBUS_STATUS_NOT_FOUND;
1701 
1702         rpc_uci_do_rollback(ctx, &gl);
1703 
1704         globfree(&gl);
1705 
1706         return 0;
1707 }
1708 
1709 static int
1710 rpc_uci_reload(struct ubus_context *ctx, struct ubus_object *obj,
1711                  struct ubus_request_data *req, const char *method,
1712                  struct blob_attr *msg)
1713 {
1714         char * const cmd[2] = { "/sbin/reload_config", NULL };
1715 
1716         if (!fork()) {
1717                 /* wait for the RPC call to complete */
1718                 sleep(2);
1719                 return execv(cmd[0], cmd);
1720         }
1721 
1722         return 0;
1723 }
1724 
1725 /*
1726  * Session destroy callback to purge associated delta directory.
1727  */
1728 static void
1729 rpc_uci_purge_savedir_cb(struct rpc_session *ses, void *priv)
1730 {
1731         char path[PATH_MAX];
1732 
1733         snprintf(path, sizeof(path) - 1, RPC_UCI_SAVEDIR_PREFIX "%s", ses->id);
1734         rpc_uci_purge_dir(path);
1735 }
1736 
1737 /*
1738  * Removes all delta directories which match the RPC_UCI_SAVEDIR_PREFIX.
1739  * This is used to clean up garbage when starting rpcd.
1740  */
1741 void rpc_uci_purge_savedirs(void)
1742 {
1743         int i;
1744         glob_t gl;
1745 
1746         if (!glob(RPC_UCI_SAVEDIR_PREFIX "*", 0, NULL, &gl))
1747         {
1748                 for (i = 0; i < gl.gl_pathc; i++)
1749                         rpc_uci_purge_dir(gl.gl_pathv[i]);
1750 
1751                 globfree(&gl);
1752         }
1753 }
1754 
1755 int rpc_uci_api_init(struct ubus_context *ctx)
1756 {
1757         static const struct ubus_method uci_methods[] = {
1758                 { .name = "configs", .handler = rpc_uci_configs },
1759                 UBUS_METHOD("get",      rpc_uci_get,      rpc_uci_get_policy),
1760                 UBUS_METHOD("state",    rpc_uci_state,    rpc_uci_get_policy),
1761                 UBUS_METHOD("add",      rpc_uci_add,      rpc_uci_add_policy),
1762                 UBUS_METHOD("set",      rpc_uci_set,      rpc_uci_set_policy),
1763                 UBUS_METHOD("delete",   rpc_uci_delete,   rpc_uci_delete_policy),
1764                 UBUS_METHOD("rename",   rpc_uci_rename,   rpc_uci_rename_policy),
1765                 UBUS_METHOD("order",    rpc_uci_order,    rpc_uci_order_policy),
1766                 UBUS_METHOD("changes",  rpc_uci_changes,  rpc_uci_config_policy),
1767                 UBUS_METHOD("revert",   rpc_uci_revert,   rpc_uci_config_policy),
1768                 UBUS_METHOD("commit",   rpc_uci_commit,   rpc_uci_config_policy),
1769                 UBUS_METHOD("apply",    rpc_uci_apply,    rpc_uci_apply_policy),
1770                 UBUS_METHOD("confirm",  rpc_uci_confirm,  rpc_uci_rollback_policy),
1771                 UBUS_METHOD("rollback", rpc_uci_rollback, rpc_uci_rollback_policy),
1772                 UBUS_METHOD_NOARG("reload_config", rpc_uci_reload),
1773         };
1774 
1775         static struct ubus_object_type uci_type =
1776                 UBUS_OBJECT_TYPE("luci-rpc-uci", uci_methods);
1777 
1778         static struct ubus_object obj = {
1779                 .name = "uci",
1780                 .type = &uci_type,
1781                 .methods = uci_methods,
1782                 .n_methods = ARRAY_SIZE(uci_methods),
1783         };
1784 
1785         static struct rpc_session_cb cb = {
1786                 .cb = rpc_uci_purge_savedir_cb
1787         };
1788 
1789         cursor = uci_alloc_context();
1790 
1791         if (!cursor)
1792                 return UBUS_STATUS_UNKNOWN_ERROR;
1793 
1794         rpc_session_destroy_cb(&cb);
1795 
1796         return ubus_add_object(ctx, &obj);
1797 }
1798 

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