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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.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("luci-rpc-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 }
1803 

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