libcoap 4.3.5-develop-72190a8
Loading...
Searching...
No Matches
coap_subscribe.c
Go to the documentation of this file.
1/* coap_subscribe.c -- subscription handling for CoAP
2 * see RFC7641
3 *
4 * Copyright (C) 2010-2019,2022-2024 Olaf Bergmann <bergmann@tzi.org>
5 *
6 * SPDX-License-Identifier: BSD-2-Clause
7 *
8 * This file is part of the CoAP library libcoap. Please see
9 * README for terms of use.
10 */
11
17#include "coap3/coap_libcoap_build.h"
18
19#ifndef min
20#define min(a,b) ((a) < (b) ? (a) : (b))
21#endif
22
23int
24coap_observe_persist_is_supported(void) {
25#if COAP_SERVER_SUPPORT && COAP_WITH_OBSERVE_PERSIST
26 return 1;
27#else /* ! (COAP_SERVER_SUPPORT && COAP_WITH_OBSERVE_PERSIST) */
28 return 0;
29#endif /* ! (COAP_SERVER_SUPPORT && COAP_WITH_OBSERVE_PERSIST) */
30}
31
32#if COAP_SERVER_SUPPORT
33void
34coap_subscription_init(coap_subscription_t *s) {
35 assert(s);
36 memset(s, 0, sizeof(coap_subscription_t));
37}
38
39void
40coap_persist_track_funcs(coap_context_t *context,
41 coap_observe_added_t observe_added,
42 coap_observe_deleted_t observe_deleted,
43 coap_track_observe_value_t track_observe_value,
44 coap_dyn_resource_added_t dyn_resource_added,
45 coap_resource_deleted_t resource_deleted,
46 uint32_t save_freq,
47 void *user_data) {
48 context->observe_added = observe_added;
49 context->observe_deleted = observe_deleted;
50 context->observe_user_data = user_data;
51 context->observe_save_freq = save_freq ? save_freq : 1;
52 context->track_observe_value = track_observe_value;
53 context->dyn_resource_added = dyn_resource_added;
54 context->resource_deleted = resource_deleted;
55}
56
57COAP_API coap_subscription_t *
58coap_persist_observe_add(coap_context_t *context,
59 coap_proto_t e_proto,
60 const coap_address_t *e_listen_addr,
61 const coap_addr_tuple_t *s_addr_info,
62 const coap_bin_const_t *raw_packet,
63 const coap_bin_const_t *oscore_info) {
64 coap_subscription_t *subs;
65
66 coap_lock_lock(context, return NULL);
67 subs = coap_persist_observe_add_lkd(context,
68 e_proto,
69 e_listen_addr,
70 s_addr_info,
71 raw_packet,
72 oscore_info);
73 coap_lock_unlock(context);
74 return subs;
75}
76
77coap_subscription_t *
78coap_persist_observe_add_lkd(coap_context_t *context,
79 coap_proto_t e_proto,
80 const coap_address_t *e_listen_addr,
81 const coap_addr_tuple_t *s_addr_info,
82 const coap_bin_const_t *raw_packet,
83 const coap_bin_const_t *oscore_info) {
84 coap_session_t *session = NULL;
85 const uint8_t *data;
86 size_t data_len;
87 coap_pdu_t *pdu = NULL;
88#if COAP_CONSTRAINED_STACK
89 /* e_packet can be protected by global_lock if needed */
90 static coap_packet_t e_packet;
91#else /* ! COAP_CONSTRAINED_STACK */
92 coap_packet_t e_packet;
93#endif /* ! COAP_CONSTRAINED_STACK */
94 coap_packet_t *packet = &e_packet;
95 coap_tick_t now;
96 coap_string_t *uri_path = NULL;
97 coap_opt_iterator_t opt_iter;
98 coap_opt_t *observe;
99 int observe_action;
100 coap_resource_t *r;
101 coap_subscription_t *s;
102 coap_endpoint_t *ep;
103
104 coap_lock_check_locked(context);
105 if (e_listen_addr == NULL || s_addr_info == NULL || raw_packet == NULL)
106 return NULL;
107
108 /* Will be creating a local 'open' session */
109 if (e_proto != COAP_PROTO_UDP)
110 return NULL;
111
112 ep = context->endpoint;
113 while (ep) {
114 if (ep->proto == e_proto &&
115 memcmp(e_listen_addr, &ep->bind_addr, sizeof(ep->bind_addr)) == 0)
116 break;
117 ep = ep->next;
118 }
119 if (!ep)
120 return NULL;
121
122 /* Build up packet */
123 memcpy(&packet->addr_info, s_addr_info, sizeof(packet->addr_info));
124 packet->ifindex = 0;
125 memcpy(&packet->payload, &raw_packet->s, sizeof(packet->payload));
126 packet->length = raw_packet->length;
127
128 data = raw_packet->s;
129 data_len = raw_packet->length;
130 if (data_len < 4)
131 goto malformed;
132
133 /* Get the session */
134
135 coap_ticks(&now);
136 session = coap_endpoint_get_session(ep, packet, now);
137 if (session == NULL)
138 goto fail;
139 /* Need max space incase PDU is updated with updated token, huge size etc. */
140 pdu = coap_pdu_init(0, 0, 0, 0);
141 if (!pdu)
142 goto fail;
143
144 if (!coap_pdu_parse(session->proto, data, data_len, pdu)) {
145 goto malformed;
146 }
147 pdu->max_size = pdu->used_size;
148
149 if (pdu->code != COAP_REQUEST_CODE_GET &&
150 pdu->code != COAP_REQUEST_CODE_FETCH)
151 goto malformed;
152
153 observe = coap_check_option(pdu, COAP_OPTION_OBSERVE, &opt_iter);
154 if (observe == NULL)
155 goto malformed;
156 observe_action = coap_decode_var_bytes(coap_opt_value(observe),
157 coap_opt_length(observe));
158 if (observe_action != COAP_OBSERVE_ESTABLISH)
159 goto malformed;
160
161 /* Get the resource */
162
163 uri_path = coap_get_uri_path(pdu);
164 if (!uri_path)
165 goto malformed;
166
167 r = coap_get_resource_from_uri_path_lkd(session->context,
168 (coap_str_const_t *)uri_path);
169 if (r == NULL) {
170 coap_log_warn("coap_persist_observe_add: resource '%s' not defined\n",
171 uri_path->s);
172 goto fail;
173 }
174 if (!r->observable) {
175 coap_log_warn("coap_persist_observe_add: resource '%s' not observable\n",
176 uri_path->s);
177 goto fail;
178 }
179 coap_delete_string(uri_path);
180 uri_path = NULL;
181
182 /* Create / update subscription for observing */
183 /* Now set up the subscription */
184 s = coap_add_observer(r, session, &pdu->actual_token, pdu);
185 if (s == NULL)
186 goto fail;
187
188#if COAP_OSCORE_SUPPORT
189 if (oscore_info) {
190 coap_log_debug("persist: OSCORE association being updated\n");
191 /*
192 * Need to track the association used for tracking this observe, done as
193 * a CBOR array. Written in coap_add_observer().
194 *
195 * If an entry is null, then use nil, else a set of bytes
196 *
197 * Currently tracking 5 items
198 * recipient_id
199 * id_context
200 * aad (from oscore_association_t)
201 * partial_iv (from oscore_association_t)
202 * nonce (from oscore_association_t)
203 */
204 oscore_ctx_t *osc_ctx;
205 const uint8_t *info_buf = oscore_info->s;
206 size_t info_buf_len = oscore_info->length;
207 size_t ret = 0;
208 coap_bin_const_t oscore_key_id;
209 coap_bin_const_t partial_iv;
210 coap_bin_const_t aad;
211 coap_bin_const_t id_context;
212 coap_bin_const_t nonce;
213 int have_aad = 0;
214 int have_partial_iv = 0;
215 int have_id_context = 0;
216 int have_nonce = 0;
217
218 ret = oscore_cbor_get_next_element(&info_buf, &info_buf_len);
219 if (ret != CBOR_ARRAY)
220 goto oscore_fail;
221 if (oscore_cbor_get_element_size(&info_buf, &info_buf_len) != 5)
222 goto oscore_fail;
223
224 /* recipient_id */
225 ret = oscore_cbor_get_next_element(&info_buf, &info_buf_len);
226 if (ret != CBOR_BYTE_STRING)
227 goto oscore_fail;
228 oscore_key_id.length = oscore_cbor_get_element_size(&info_buf,
229 &info_buf_len);
230 oscore_key_id.s = info_buf;
231 info_buf += oscore_key_id.length;
232
233 /* id_context */
234 ret = oscore_cbor_get_next_element(&info_buf, &info_buf_len);
235 if (ret == CBOR_BYTE_STRING) {
236 id_context.length = oscore_cbor_get_element_size(&info_buf,
237 &info_buf_len);
238 id_context.s = info_buf;
239 info_buf += id_context.length;
240 have_id_context = 1;
241 } else if (ret == CBOR_SIMPLE_VALUE &&
242 oscore_cbor_get_element_size(&info_buf,
243 &info_buf_len) == CBOR_NULL) {
244 } else
245 goto oscore_fail;
246
247 /* aad */
248 ret = oscore_cbor_get_next_element(&info_buf, &info_buf_len);
249 if (ret == CBOR_BYTE_STRING) {
250 aad.length = oscore_cbor_get_element_size(&info_buf, &info_buf_len);
251 aad.s = info_buf;
252 info_buf += aad.length;
253 have_aad = 1;
254 } else if (ret == CBOR_SIMPLE_VALUE &&
255 oscore_cbor_get_element_size(&info_buf,
256 &info_buf_len) == CBOR_NULL) {
257 } else
258 goto oscore_fail;
259
260 /* partial_iv */
261 ret = oscore_cbor_get_next_element(&info_buf, &info_buf_len);
262 if (ret == CBOR_BYTE_STRING) {
263 partial_iv.length = oscore_cbor_get_element_size(&info_buf,
264 &info_buf_len);
265 partial_iv.s = info_buf;
266 info_buf += partial_iv.length;
267 have_partial_iv = 1;
268 } else if (ret == CBOR_SIMPLE_VALUE &&
269 oscore_cbor_get_element_size(&info_buf,
270 &info_buf_len) == CBOR_NULL) {
271 } else
272 goto oscore_fail;
273
274 /* nonce */
275 ret = oscore_cbor_get_next_element(&info_buf, &info_buf_len);
276 if (ret == CBOR_BYTE_STRING) {
277 nonce.length = oscore_cbor_get_element_size(&info_buf,
278 &info_buf_len);
279 nonce.s = info_buf;
280 info_buf += nonce.length;
281 have_nonce = 1;
282 } else if (ret == CBOR_SIMPLE_VALUE &&
283 oscore_cbor_get_element_size(&info_buf,
284 &info_buf_len) == CBOR_NULL) {
285 } else
286 goto oscore_fail;
287
288 osc_ctx = oscore_find_context(session->context, oscore_key_id,
289 have_id_context ? &id_context : NULL, NULL,
290 &session->recipient_ctx);
291 if (osc_ctx) {
292 session->oscore_encryption = 1;
293 oscore_new_association(session, pdu, &pdu->actual_token,
294 session->recipient_ctx,
295 have_aad ? &aad : NULL,
296 have_nonce ? &nonce : NULL,
297 have_partial_iv ? &partial_iv : NULL,
298 1);
299 coap_log_debug("persist: OSCORE association added\n");
300 oscore_log_hex_value(COAP_LOG_OSCORE, "partial_iv",
301 have_partial_iv ? &partial_iv : NULL);
302 }
303 }
304oscore_fail:
305#else /* ! COAP_OSCORE_SUPPORT */
306 (void)oscore_info;
307#endif /* ! COAP_OSCORE_SUPPORT */
308 coap_delete_pdu(pdu);
309 return s;
310
311malformed:
312 coap_log_warn("coap_persist_observe_add: discard malformed PDU\n");
313fail:
314 coap_delete_string(uri_path);
315 coap_delete_pdu(pdu);
316 return NULL;
317}
318
319#if COAP_WITH_OBSERVE_PERSIST
320#include <stdio.h>
321
322/*
323 * read in active observe entry.
324 */
325static int
326coap_op_observe_read(FILE *fp, coap_subscription_t **observe_key,
327 coap_proto_t *e_proto, coap_address_t *e_listen_addr,
328 coap_addr_tuple_t *s_addr_info,
329 coap_bin_const_t **raw_packet, coap_bin_const_t **oscore_info) {
330 ssize_t size;
331 coap_binary_t *scratch = NULL;
332
333 assert(fp && observe_key && e_proto && e_listen_addr && s_addr_info &&
334 raw_packet && oscore_info);
335
336 *raw_packet = NULL;
337 *oscore_info = NULL;
338
339 if (fread(observe_key, sizeof(*observe_key), 1, fp) == 1) {
340 /* New record 'key proto listen addr_info len raw_packet len oscore' */
341 if (fread(e_proto, sizeof(*e_proto), 1, fp) != 1)
342 goto fail;
343 if (fread(e_listen_addr, sizeof(*e_listen_addr), 1, fp) != 1)
344 goto fail;
345 if (fread(s_addr_info, sizeof(*s_addr_info), 1, fp) != 1)
346 goto fail;
347 if (fread(&size, sizeof(size), 1, fp) != 1)
348 goto fail;
349 if (size < 0 || size > 0x10000)
350 goto fail;
351 scratch = coap_new_binary(size);
352 if ((scratch) == NULL)
353 goto fail;
354 if (fread(scratch->s, scratch->length, 1, fp) != 1)
355 goto fail;
356 *raw_packet = (coap_bin_const_t *)scratch;
357 scratch = NULL;
358 if (fread(&size, sizeof(size), 1, fp) != 1)
359 goto fail;
360 /* If size == -1, then no oscore information */
361 if (size == -1)
362 return 1;
363 else if (size < 0 || size > 0x10000)
364 goto fail;
365 else {
366 scratch = coap_new_binary(size);
367 if (scratch == NULL)
368 goto fail;
369 if (fread(scratch->s, scratch->length, 1, fp) != 1)
370 goto fail;
371 *oscore_info = (coap_bin_const_t *)scratch;
372 }
373 return 1;
374 }
375fail:
376 coap_delete_bin_const(*raw_packet);
377 coap_delete_binary(scratch);
378
379 *observe_key = NULL;
380 memset(e_proto, 0, sizeof(*e_proto));
381 memset(e_listen_addr, 0, sizeof(*e_listen_addr));
382 memset(s_addr_info, 0, sizeof(*s_addr_info));
383 *raw_packet = NULL;
384 return 0;
385}
386
387/*
388 * write out active observe entry.
389 */
390static int
391coap_op_observe_write(FILE *fp, coap_subscription_t *observe_key,
392 coap_proto_t e_proto, coap_address_t e_listen_addr,
393 coap_addr_tuple_t s_addr_info,
394 coap_bin_const_t *raw_packet, coap_bin_const_t *oscore_info) {
395 if (fwrite(&observe_key, sizeof(observe_key), 1, fp) != 1)
396 goto fail;
397 if (fwrite(&e_proto, sizeof(e_proto), 1, fp) != 1)
398 goto fail;
399 if (fwrite(&e_listen_addr, sizeof(e_listen_addr),
400 1, fp) != 1)
401 goto fail;
402 if (fwrite(&s_addr_info, sizeof(s_addr_info), 1, fp) != 1)
403 goto fail;
404 if (fwrite(&raw_packet->length, sizeof(raw_packet->length), 1, fp) != 1)
405 goto fail;
406 if (fwrite(raw_packet->s, raw_packet->length, 1, fp) != 1)
407 goto fail;
408 if (oscore_info) {
409 if (fwrite(&oscore_info->length, sizeof(oscore_info->length), 1, fp) != 1)
410 goto fail;
411 if (fwrite(oscore_info->s, oscore_info->length, 1, fp) != 1)
412 goto fail;
413 } else {
414 ssize_t not_defined = -1;
415
416 if (fwrite(&not_defined, sizeof(not_defined), 1, fp) != 1)
417 goto fail;
418 }
419 return 1;
420fail:
421 return 0;
422}
423
424/*
425 * This should be called before coap_persist_track_funcs() to prevent
426 * coap_op_observe_added() getting unnecessarily called.
427 * It should be called after init_resources() and coap_op_resource_load_disk()
428 * so that all the resources are in place.
429 */
430static void
431coap_op_observe_load_disk(coap_context_t *ctx) {
432 FILE *fp_orig = fopen((const char *)ctx->observe_save_file->s, "r");
433 FILE *fp_new = NULL;
434 coap_subscription_t *observe_key = NULL;
435 coap_proto_t e_proto;
436 coap_address_t e_listen_addr;
437 coap_addr_tuple_t s_addr_info;
438 coap_bin_const_t *raw_packet = NULL;
439 coap_bin_const_t *oscore_info = NULL;
440 char *new = NULL;
441
442 if (fp_orig == NULL)
443 goto fail;
444
445 new = coap_malloc_type(COAP_STRING, ctx->observe_save_file->length + 5);
446 if (!new)
447 goto fail;
448
449 strcpy(new, (const char *)ctx->observe_save_file->s);
450 strcat(new, ".tmp");
451 fp_new = fopen(new, "w+");
452 if (fp_new == NULL)
453 goto fail;
454
455 /* Go through and load oscore entry, updating key on the way */
456 while (1) {
457 if (!coap_op_observe_read(fp_orig, &observe_key, &e_proto, &e_listen_addr,
458 &s_addr_info, &raw_packet, &oscore_info))
459 break;
460 coap_log_debug("persist: New session/observe being created\n");
461 observe_key = coap_persist_observe_add_lkd(ctx, e_proto,
462 &e_listen_addr,
463 &s_addr_info,
464 raw_packet,
465 oscore_info);
466 if (observe_key) {
467 if (!coap_op_observe_write(fp_new, observe_key, e_proto, e_listen_addr,
468 s_addr_info, raw_packet, oscore_info))
469 goto fail;
470 coap_delete_bin_const(raw_packet);
471 raw_packet = NULL;
472 coap_delete_bin_const(oscore_info);
473 oscore_info = NULL;
474 }
475 }
476 coap_delete_bin_const(raw_packet);
477 raw_packet = NULL;
478 coap_delete_bin_const(oscore_info);
479 oscore_info = NULL;
480
481 if (fflush(fp_new) == EOF)
482 goto fail;
483 fclose(fp_new);
484 fclose(fp_orig);
485 /* Either old or new is in place */
486 (void)rename(new, (const char *)ctx->observe_save_file->s);
487 coap_free_type(COAP_STRING, new);
488 return;
489
490fail:
491 coap_delete_bin_const(raw_packet);
492 coap_delete_bin_const(oscore_info);
493 if (fp_new)
494 fclose(fp_new);
495 if (fp_orig)
496 fclose(fp_orig);
497 if (new) {
498 (void)remove(new);
499 }
500 coap_free_type(COAP_STRING, new);
501 return;
502}
503
504/*
505 * client has registered a new observe subscription request.
506 */
507static int
508coap_op_observe_added(coap_session_t *session,
509 coap_subscription_t *a_observe_key,
510 coap_proto_t a_e_proto, coap_address_t *a_e_listen_addr,
511 coap_addr_tuple_t *a_s_addr_info,
512 coap_bin_const_t *a_raw_packet,
513 coap_bin_const_t *a_oscore_info, void *user_data) {
514 FILE *fp_orig = fopen((const char *)session->context->observe_save_file->s,
515 "r");
516 FILE *fp_new = NULL;
517 coap_subscription_t *observe_key = NULL;
518 coap_proto_t e_proto;
519 coap_address_t e_listen_addr;
520 coap_addr_tuple_t s_addr_info;
521 coap_bin_const_t *raw_packet = NULL;
522 coap_bin_const_t *oscore_info = NULL;
523 char *new = NULL;
524
525 (void)user_data;
526
527 new = coap_malloc_type(COAP_STRING,
528 session->context->observe_save_file->length + 5);
529 if (!new)
530 goto fail;
531
532 strcpy(new, (const char *)session->context->observe_save_file->s);
533 strcat(new, ".tmp");
534 fp_new = fopen(new, "w+");
535 if (fp_new == NULL)
536 goto fail;
537
538 /* Go through and delete observe entry if it exists */
539 while (fp_orig) {
540 if (!coap_op_observe_read(fp_orig, &observe_key, &e_proto, &e_listen_addr,
541 &s_addr_info, &raw_packet, &oscore_info))
542 break;
543 if (observe_key != a_observe_key) {
544 if (!coap_op_observe_write(fp_new, observe_key, e_proto, e_listen_addr,
545 s_addr_info, raw_packet, oscore_info))
546 goto fail;
547 }
548 coap_delete_bin_const(raw_packet);
549 raw_packet = NULL;
550 coap_delete_bin_const(oscore_info);
551 oscore_info = NULL;
552 }
553 coap_delete_bin_const(raw_packet);
554 raw_packet = NULL;
555 coap_delete_bin_const(oscore_info);
556 oscore_info = NULL;
557
558 /* Add in new entry to the end */
559 if (!coap_op_observe_write(fp_new, a_observe_key, a_e_proto, *a_e_listen_addr,
560 *a_s_addr_info, a_raw_packet, a_oscore_info))
561 goto fail;
562
563 if (fflush(fp_new) == EOF)
564 goto fail;
565 fclose(fp_new);
566 if (fp_orig)
567 fclose(fp_orig);
568 /* Either old or new is in place */
569 (void)rename(new, (const char *)session->context->observe_save_file->s);
570 coap_free_type(COAP_STRING, new);
571 return 1;
572
573fail:
574 coap_delete_bin_const(raw_packet);
575 coap_delete_bin_const(oscore_info);
576 if (fp_new)
577 fclose(fp_new);
578 if (fp_orig)
579 fclose(fp_orig);
580 if (new) {
581 (void)remove(new);
582 }
583 coap_free_type(COAP_STRING, new);
584 return 0;
585}
586
587/*
588 * client has de-registered a observe subscription request.
589 */
590static int
591coap_op_observe_deleted(coap_session_t *session,
592 coap_subscription_t *d_observe_key,
593 void *user_data) {
594 FILE *fp_orig = fopen((const char *)session->context->observe_save_file->s,
595 "r");
596 FILE *fp_new = NULL;
597 coap_subscription_t *observe_key = NULL;
598 coap_proto_t e_proto;
599 coap_address_t e_listen_addr;
600 coap_addr_tuple_t s_addr_info;
601 coap_bin_const_t *raw_packet = NULL;
602 coap_bin_const_t *oscore_info = NULL;
603 char *new = NULL;
604
605 (void)user_data;
606
607 if (fp_orig == NULL)
608 goto fail;
609 new = coap_malloc_type(COAP_STRING,
610 session->context->observe_save_file->length + 5);
611 if (!new)
612 goto fail;
613
614 strcpy(new, (const char *)session->context->observe_save_file->s);
615 strcat(new, ".tmp");
616 fp_new = fopen(new, "w+");
617 if (fp_new == NULL)
618 goto fail;
619
620 /* Go through and locate observe entry to delete and not copy it across */
621 while (1) {
622 if (!coap_op_observe_read(fp_orig, &observe_key, &e_proto, &e_listen_addr,
623 &s_addr_info, &raw_packet, &oscore_info))
624 break;
625 if (observe_key != d_observe_key) {
626 if (!coap_op_observe_write(fp_new, observe_key, e_proto, e_listen_addr,
627 s_addr_info, (coap_bin_const_t *)raw_packet,
628 (coap_bin_const_t *)oscore_info))
629 goto fail;
630 }
631 coap_delete_bin_const(raw_packet);
632 raw_packet = NULL;
633 coap_delete_bin_const(oscore_info);
634 oscore_info = NULL;
635 }
636 coap_delete_bin_const(raw_packet);
637 raw_packet = NULL;
638 coap_delete_bin_const(oscore_info);
639 oscore_info = NULL;
640
641 if (fflush(fp_new) == EOF)
642 goto fail;
643 fclose(fp_new);
644 fclose(fp_orig);
645 /* Either old or new is in place */
646 (void)rename(new, (const char *)session->context->observe_save_file->s);
647 coap_free_type(COAP_STRING, new);
648 return 1;
649
650fail:
651 coap_delete_bin_const(raw_packet);
652 coap_delete_bin_const(oscore_info);
653 if (fp_new)
654 fclose(fp_new);
655 if (fp_orig)
656 fclose(fp_orig);
657 if (new) {
658 (void)remove(new);
659 }
660 coap_free_type(COAP_STRING, new);
661 return 0;
662}
663
664/*
665 * This should be called before coap_persist_track_funcs() to prevent
666 * coap_op_obs_cnt_track_observe() getting unnecessarily called.
667 * Should be called after coap_op_dyn_resource_load_disk() to make sure that
668 * all the resources are in the right place.
669 */
670static void
671coap_op_obs_cnt_load_disk(coap_context_t *context) {
672 FILE *fp = fopen((const char *)context->obs_cnt_save_file->s, "r");
673 char buf[1500];
674
675 if (fp == NULL)
676 return;
677
678 while (fgets(buf, sizeof(buf), fp) != NULL) {
679 char *cp = strchr(buf, ' ');
680 coap_str_const_t resource_key;
681 uint32_t observe_num;
682 coap_resource_t *r;
683
684 if (!cp)
685 break;
686
687 *cp = '\000';
688 cp++;
689 observe_num = atoi(cp);
690 /*
691 * Need to assume 0 .. (context->observe_save_freq-1) have in addition
692 * been sent so need to round up to latest possible send value
693 */
694 observe_num = ((observe_num + context->observe_save_freq) /
695 context->observe_save_freq) *
696 context->observe_save_freq - 1;
697 resource_key.s = (uint8_t *)buf;
698 resource_key.length = strlen(buf);
699 r = coap_get_resource_from_uri_path_lkd(context, &resource_key);
700 if (r) {
701 coap_log_debug("persist: Initial observe number being updated\n");
702 coap_persist_set_observe_num(r, observe_num);
703 }
704 }
705 fclose(fp);
706}
707
708/*
709 * Called when the observe value of a resource has been changed, but limited
710 * to be called every context->context->observe_save_freq to reduce update
711 * overheads.
712 */
713static int
714coap_op_obs_cnt_track_observe(coap_context_t *context,
715 coap_str_const_t *resource_name,
716 uint32_t n_observe_num,
717 void *user_data) {
718 FILE *fp_orig = fopen((const char *)context->obs_cnt_save_file->s, "r");
719 FILE *fp_new = NULL;
720 char buf[1500];
721 char *new = NULL;
722
723 (void)user_data;
724
725 new = coap_malloc_type(COAP_STRING, context->obs_cnt_save_file->length + 5);
726 if (!new)
727 goto fail;
728
729 strcpy(new, (const char *)context->obs_cnt_save_file->s);
730 strcat(new, ".tmp");
731 fp_new = fopen(new, "w+");
732 if (fp_new == NULL)
733 goto fail;
734
735 /* Go through and locate resource entry to update */
736 while (fp_orig && fgets(buf, sizeof(buf), fp_orig) != NULL) {
737 char *cp = strchr(buf, ' ');
738 uint32_t observe_num;
739 coap_bin_const_t resource_key;
740
741 if (!cp)
742 break;
743
744 *cp = '\000';
745 cp++;
746 observe_num = atoi(cp);
747 resource_key.s = (uint8_t *)buf;
748 resource_key.length = strlen(buf);
749 if (!coap_binary_equal(resource_name, &resource_key)) {
750 if (fprintf(fp_new, "%s %u\n", resource_key.s, observe_num) < 0)
751 goto fail;
752 }
753 }
754 if (fprintf(fp_new, "%s %u\n", resource_name->s, n_observe_num) < 0)
755 goto fail;
756 if (fflush(fp_new) == EOF)
757 goto fail;
758 fclose(fp_new);
759 if (fp_orig)
760 fclose(fp_orig);
761 /* Either old or new is in place */
762 (void)rename(new, (const char *)context->obs_cnt_save_file->s);
763 coap_free_type(COAP_STRING, new);
764 return 1;
765
766fail:
767 if (fp_new)
768 fclose(fp_new);
769 if (fp_orig)
770 fclose(fp_orig);
771 if (new) {
772 (void)remove(new);
773 }
774 coap_free_type(COAP_STRING, new);
775 return 0;
776}
777
778/*
779 * Called when a resource has been deleted.
780 */
781static int
782coap_op_obs_cnt_deleted(coap_context_t *context,
783 coap_str_const_t *resource_name) {
784 FILE *fp_orig = fopen((const char *)context->obs_cnt_save_file->s, "r");
785 FILE *fp_new = NULL;
786 char buf[1500];
787 char *new = NULL;
788
789 if (fp_orig == NULL)
790 goto fail;
791 new = coap_malloc_type(COAP_STRING, context->obs_cnt_save_file->length + 5);
792 if (!new)
793 goto fail;
794
795 strcpy(new, (const char *)context->obs_cnt_save_file->s);
796 strcat(new, ".tmp");
797 fp_new = fopen(new, "w+");
798 if (fp_new == NULL)
799 goto fail;
800
801 /* Go through and locate resource entry to delete */
802 while (fgets(buf, sizeof(buf), fp_orig) != NULL) {
803 char *cp = strchr(buf, ' ');
804 uint32_t observe_num;
805 coap_bin_const_t resource_key;
806
807 if (!cp)
808 break;
809
810 *cp = '\000';
811 cp++;
812 observe_num = atoi(cp);
813 resource_key.s = (uint8_t *)buf;
814 resource_key.length = strlen(buf);
815 if (!coap_binary_equal(resource_name, &resource_key)) {
816 if (fprintf(fp_new, "%s %u\n", resource_key.s, observe_num) < 0)
817 goto fail;
818 }
819 }
820 if (fflush(fp_new) == EOF)
821 goto fail;
822 fclose(fp_new);
823 fclose(fp_orig);
824 /* Either old or new is in place */
825 (void)rename(new, (const char *)context->obs_cnt_save_file->s);
826 coap_free_type(COAP_STRING, new);
827 return 1;
828
829fail:
830 if (fp_new)
831 fclose(fp_new);
832 if (fp_orig)
833 fclose(fp_orig);
834 if (new) {
835 (void)remove(new);
836 }
837 coap_free_type(COAP_STRING, new);
838 return 0;
839}
840
841/*
842 * read in dynamic resource entry, allocating name & raw_packet
843 * which need to be freed off by caller.
844 */
845static int
846coap_op_dyn_resource_read(FILE *fp, coap_proto_t *e_proto,
847 coap_string_t **name,
848 coap_binary_t **raw_packet) {
849 ssize_t size;
850
851 *name = NULL;
852 *raw_packet = NULL;
853
854 if (fread(e_proto, sizeof(*e_proto), 1, fp) == 1) {
855 /* New record 'proto len resource_name len raw_packet' */
856 if (fread(&size, sizeof(size), 1, fp) != 1)
857 goto fail;
858 if (size < 0 || size > 0x10000)
859 goto fail;
860 *name = coap_new_string(size);
861 if (!(*name))
862 goto fail;
863 if (fread((*name)->s, size, 1, fp) != 1)
864 goto fail;
865 if (fread(&size, sizeof(size), 1, fp) != 1)
866 goto fail;
867 if (size < 0 || size > 0x10000)
868 goto fail;
869 *raw_packet = coap_new_binary(size);
870 if (!(*raw_packet))
871 goto fail;
872 if (fread((*raw_packet)->s, size, 1, fp) != 1)
873 goto fail;
874 return 1;
875 }
876fail:
877 return 0;
878}
879
880/*
881 * write out dynamic resource entry.
882 */
883static int
884coap_op_dyn_resource_write(FILE *fp, coap_proto_t e_proto,
885 coap_str_const_t *name,
886 coap_bin_const_t *raw_packet) {
887 if (fwrite(&e_proto, sizeof(e_proto), 1, fp) != 1)
888 goto fail;
889 if (fwrite(&name->length, sizeof(name->length), 1, fp) != 1)
890 goto fail;
891 if (fwrite(name->s, name->length, 1, fp) != 1)
892 goto fail;
893 if (fwrite(&raw_packet->length, sizeof(raw_packet->length), 1, fp) != 1)
894 goto fail;
895 if (fwrite(raw_packet->s, raw_packet->length, 1, fp) != 1)
896 goto fail;
897 return 1;
898fail:
899 return 0;
900}
901
902/*
903 * This should be called before coap_persist_track_funcs() to prevent
904 * coap_op_dyn_resource_added() getting unnecessarily called.
905 *
906 * Each record 'proto len resource_name len raw_packet'
907 */
908static void
909coap_op_dyn_resource_load_disk(coap_context_t *ctx) {
910 FILE *fp_orig = NULL;
911 coap_proto_t e_proto;
912 coap_string_t *name = NULL;
913 coap_binary_t *raw_packet = NULL;
914 coap_resource_t *r;
915 coap_session_t *session = NULL;
916 coap_pdu_t *request = NULL;
917 coap_pdu_t *response = NULL;
918 coap_string_t *query = NULL;
919
920 if (!ctx->unknown_resource)
921 return;
922
923 fp_orig = fopen((const char *)ctx->dyn_resource_save_file->s, "r");
924 if (fp_orig == NULL)
925 return;
926 session = (coap_session_t *)coap_malloc_type(COAP_SESSION,
927 sizeof(coap_session_t));
928 if (!session)
929 goto fail;
930 memset(session, 0, sizeof(coap_session_t));
931 session->context = ctx;
932
933 /* Go through and create each dynamic resource if it does not exist*/
934 while (1) {
935 if (!coap_op_dyn_resource_read(fp_orig, &e_proto, &name, &raw_packet))
936 break;
937 r = coap_get_resource_from_uri_path_lkd(ctx, (coap_str_const_t *)name);
938 if (!r) {
939 /* Create the new resource using the application logic */
940
941 coap_log_debug("persist: dynamic resource being re-created\n");
942 /*
943 * Need max space incase PDU is updated with updated token,
944 * huge size etc.
945 * */
946 request = coap_pdu_init(0, 0, 0, 0);
947 if (!request)
948 goto fail;
949
950 session->proto = e_proto;
951 if (!coap_pdu_parse(session->proto, raw_packet->s,
952 raw_packet->length, request)) {
953 goto fail;
954 }
955 if (!ctx->unknown_resource->handler[request->code-1])
956 goto fail;
957 response = coap_pdu_init(0, 0, 0, 0);
958 if (!response)
959 goto fail;
960 query = coap_get_query(request);
961 /* Call the application handler to set up this dynamic resource */
962 coap_lock_callback_release(ctx,
963 ctx->unknown_resource->handler[request->code-1](ctx->unknown_resource,
964 session, request,
965 query, response),
966 /* context is being freed off */
967 goto fail);
968 coap_delete_string(query);
969 query = NULL;
970 coap_delete_pdu(request);
971 request = NULL;
972 coap_delete_pdu(response);
973 response = NULL;
974 }
975 coap_delete_string(name);
976 coap_delete_binary(raw_packet);
977 }
978fail:
979 coap_delete_string(name);
980 coap_delete_binary(raw_packet);
981 coap_delete_string(query);
982 coap_delete_pdu(request);
983 coap_delete_pdu(response);
984 fclose(fp_orig);
985 coap_free_type(COAP_SESSION, session);
986}
987
988/*
989 * Server has set up a new dynamic resource agains a request for an unknown
990 * resource.
991 */
992static int
993coap_op_dyn_resource_added(coap_session_t *session,
994 coap_str_const_t *resource_name,
995 coap_bin_const_t *packet,
996 void *user_data) {
997 FILE *fp_orig;
998 FILE *fp_new = NULL;
999 char *new = NULL;
1000 coap_context_t *context = session->context;
1001 coap_string_t *name = NULL;
1002 coap_binary_t *raw_packet = NULL;
1003 coap_proto_t e_proto;
1004
1005 (void)user_data;
1006
1007 fp_orig = fopen((const char *)context->dyn_resource_save_file->s, "a");
1008 if (fp_orig == NULL)
1009 return 0;
1010
1011 new = coap_malloc_type(COAP_STRING,
1012 context->dyn_resource_save_file->length + 5);
1013 if (!new)
1014 goto fail;
1015
1016 strcpy(new, (const char *)context->dyn_resource_save_file->s);
1017 strcat(new, ".tmp");
1018 fp_new = fopen(new, "w+");
1019 if (fp_new == NULL)
1020 goto fail;
1021
1022 /* Go through and locate duplicate resource to delete */
1023 while (1) {
1024 if (!coap_op_dyn_resource_read(fp_orig, &e_proto, &name, &raw_packet))
1025 break;
1026 if (!coap_string_equal(resource_name, name)) {
1027 /* Copy across non-matching entry */
1028 if (!coap_op_dyn_resource_write(fp_new, e_proto, (coap_str_const_t *)name,
1029 (coap_bin_const_t *)raw_packet))
1030 break;
1031 }
1032 coap_delete_string(name);
1033 name = NULL;
1034 coap_delete_binary(raw_packet);
1035 raw_packet = NULL;
1036 }
1037 coap_delete_string(name);
1038 coap_delete_binary(raw_packet);
1039 /* Add new entry to the end */
1040 if (!coap_op_dyn_resource_write(fp_new, session->proto,
1041 resource_name, packet))
1042 goto fail;
1043
1044 if (fflush(fp_new) == EOF)
1045 goto fail;
1046 fclose(fp_new);
1047 fclose(fp_orig);
1048 /* Either old or new is in place */
1049 (void)rename(new, (const char *)context->dyn_resource_save_file->s);
1050 coap_free_type(COAP_STRING, new);
1051 return 1;
1052
1053fail:
1054 if (fp_new)
1055 fclose(fp_new);
1056 if (fp_orig)
1057 fclose(fp_orig);
1058 if (new) {
1059 (void)remove(new);
1060 }
1061 coap_free_type(COAP_STRING, new);
1062 return 0;
1063}
1064
1065/*
1066 * Server has deleted a resource
1067 */
1068static int
1069coap_op_resource_deleted(coap_context_t *context,
1070 coap_str_const_t *resource_name,
1071 void *user_data) {
1072 FILE *fp_orig = NULL;
1073 FILE *fp_new = NULL;
1074 char *new = NULL;
1075 coap_proto_t e_proto;
1076 coap_string_t *name = NULL;
1077 coap_binary_t *raw_packet = NULL;
1078 (void)user_data;
1079
1080 coap_op_obs_cnt_deleted(context, resource_name);
1081
1082 fp_orig = fopen((const char *)context->dyn_resource_save_file->s, "r");
1083 if (fp_orig == NULL)
1084 return 1;
1085
1086 new = coap_malloc_type(COAP_STRING,
1087 context->dyn_resource_save_file->length + 5);
1088 if (!new)
1089 goto fail;
1090
1091 strcpy(new, (const char *)context->dyn_resource_save_file->s);
1092 strcat(new, ".tmp");
1093 fp_new = fopen(new, "w+");
1094 if (fp_new == NULL)
1095 goto fail;
1096
1097 /* Go through and locate resource to delete and not copy it across */
1098 while (1) {
1099 if (!coap_op_dyn_resource_read(fp_orig, &e_proto, &name, &raw_packet))
1100 break;
1101 if (!coap_string_equal(resource_name, name)) {
1102 /* Copy across non-matching entry */
1103 if (!coap_op_dyn_resource_write(fp_new, e_proto, (coap_str_const_t *)name,
1104 (coap_bin_const_t *)raw_packet))
1105 break;
1106 }
1107 coap_delete_string(name);
1108 name = NULL;
1109 coap_delete_binary(raw_packet);
1110 raw_packet = NULL;
1111 }
1112 coap_delete_string(name);
1113 coap_delete_binary(raw_packet);
1114
1115 if (fflush(fp_new) == EOF)
1116 goto fail;
1117 fclose(fp_new);
1118 fclose(fp_orig);
1119 /* Either old or new is in place */
1120 (void)rename(new, (const char *)context->dyn_resource_save_file->s);
1121 coap_free_type(COAP_STRING, new);
1122 return 1;
1123
1124fail:
1125 if (fp_new)
1126 fclose(fp_new);
1127 if (fp_orig)
1128 fclose(fp_orig);
1129 if (new) {
1130 (void)remove(new);
1131 }
1132 coap_free_type(COAP_STRING, new);
1133 return 0;
1134}
1135
1136COAP_API int
1137coap_persist_startup(coap_context_t *context,
1138 const char *dyn_resource_save_file,
1139 const char *observe_save_file,
1140 const char *obs_cnt_save_file,
1141 uint32_t save_freq) {
1142 int ret;
1143
1144 coap_lock_lock(context, return 0);
1145 ret = coap_persist_startup_lkd(context,
1146 dyn_resource_save_file,
1147 observe_save_file,
1148 obs_cnt_save_file,
1149 save_freq);
1150 coap_lock_unlock(context);
1151 return ret;
1152}
1153
1154int
1155coap_persist_startup_lkd(coap_context_t *context,
1156 const char *dyn_resource_save_file,
1157 const char *observe_save_file,
1158 const char *obs_cnt_save_file,
1159 uint32_t save_freq) {
1160 coap_lock_check_locked(context);
1161 if (dyn_resource_save_file) {
1162 context->dyn_resource_save_file =
1163 coap_new_bin_const((const uint8_t *)dyn_resource_save_file,
1164 strlen(dyn_resource_save_file));
1165 if (!context->dyn_resource_save_file)
1166 return 0;
1167 coap_op_dyn_resource_load_disk(context);
1168 context->dyn_resource_added = coap_op_dyn_resource_added;
1169 context->resource_deleted = coap_op_resource_deleted;
1170 }
1171 if (obs_cnt_save_file) {
1172 context->obs_cnt_save_file =
1173 coap_new_bin_const((const uint8_t *)obs_cnt_save_file,
1174 strlen(obs_cnt_save_file));
1175 if (!context->obs_cnt_save_file)
1176 return 0;
1177 context->observe_save_freq = save_freq ? save_freq : 1;
1178 coap_op_obs_cnt_load_disk(context);
1179 context->track_observe_value = coap_op_obs_cnt_track_observe;
1180 context->resource_deleted = coap_op_resource_deleted;
1181 }
1182 if (observe_save_file) {
1183 context->observe_save_file =
1184 coap_new_bin_const((const uint8_t *)observe_save_file,
1185 strlen(observe_save_file));
1186 if (!context->observe_save_file)
1187 return 0;
1188 coap_op_observe_load_disk(context);
1189 context->observe_added = coap_op_observe_added;
1190 context->observe_deleted = coap_op_observe_deleted;
1191 }
1192 return 1;
1193}
1194
1195void
1196coap_persist_cleanup(coap_context_t *context) {
1197 coap_delete_bin_const(context->dyn_resource_save_file);
1198 coap_delete_bin_const(context->obs_cnt_save_file);
1199 coap_delete_bin_const(context->observe_save_file);
1200 context->dyn_resource_save_file = NULL;
1201 context->obs_cnt_save_file = NULL;
1202 context->observe_save_file = NULL;
1203
1204 /* Close down any tracking */
1205 coap_persist_track_funcs(context, NULL, NULL, NULL, NULL,
1206 NULL, 0, NULL);
1207}
1208
1209COAP_API void
1210coap_persist_stop(coap_context_t *context) {
1211 if (!context)
1212 return;
1213 coap_lock_lock(context, return);
1214 coap_persist_stop_lkd(context);
1215 coap_lock_unlock(context);
1216}
1217
1218void
1219coap_persist_stop_lkd(coap_context_t *context) {
1220 if (context == NULL)
1221 return;
1222 coap_lock_check_locked(context);
1223 context->observe_no_clear = 1;
1224 coap_persist_cleanup(context);
1225}
1226#else /* ! COAP_WITH_OBSERVE_PERSIST */
1227COAP_API int
1228coap_persist_startup(coap_context_t *context,
1229 const char *dyn_resource_save_file,
1230 const char *observe_save_file,
1231 const char *obs_cnt_save_file,
1232 uint32_t save_freq) {
1233 (void)context;
1234 (void)dyn_resource_save_file;
1235 (void)observe_save_file;
1236 (void)obs_cnt_save_file;
1237 (void)save_freq;
1238 return 0;
1239}
1240
1241COAP_API void
1242coap_persist_stop(coap_context_t *context) {
1243 context->observe_no_clear = 1;
1244 /* Close down any tracking */
1245 coap_persist_track_funcs(context, NULL, NULL, NULL, NULL,
1246 NULL, 0, NULL);
1247}
1248
1249#endif /* ! COAP_WITH_OBSERVE_PERSIST */
1250
1251#endif /* COAP_SERVER_SUPPORT */
coap_libcoap_build.h
Library specific build wrapper for coap_internal.h.
COAP_API
#define COAP_API
Definition coap_libcoap_build.h:41
COAP_SESSION
@ COAP_SESSION
Definition coap_mem.h:51
COAP_STRING
@ COAP_STRING
Definition coap_mem.h:39
coap_malloc_type
void * coap_malloc_type(coap_memory_tag_t type, size_t size)
Allocates a chunk of size bytes and returns a pointer to the newly allocated memory.
coap_free_type
void coap_free_type(coap_memory_tag_t type, void *p)
Releases the memory that was allocated by coap_malloc_type().
coap_opt_t
uint8_t coap_opt_t
Use byte-oriented access methods here because sliding a complex struct coap_opt_t over the data buffe...
Definition coap_option.h:26
coap_tick_t
uint64_t coap_tick_t
This data type represents internal timer ticks with COAP_TICKS_PER_SECOND resolution.
Definition coap_time.h:143
coap_get_resource_from_uri_path_lkd
coap_resource_t * coap_get_resource_from_uri_path_lkd(coap_context_t *context, coap_str_const_t *uri_path)
Returns the resource identified by the unique string uri_path.
coap_ticks
void coap_ticks(coap_tick_t *)
Returns the current value of an internal tick counter.
coap_decode_var_bytes
unsigned int coap_decode_var_bytes(const uint8_t *buf, size_t len)
Decodes multiple-length byte sequences.
Definition coap_encode.c:38
coap_lock_callback_release
#define coap_lock_callback_release(c, func, failed)
Dummy for no thread-safe code.
Definition coap_threadsafe_internal.h:536
coap_lock_unlock
#define coap_lock_unlock(c)
Dummy for no thread-safe code.
Definition coap_threadsafe_internal.h:477
coap_lock_lock
#define coap_lock_lock(c, failed)
Dummy for no thread-safe code.
Definition coap_threadsafe_internal.h:465
coap_lock_check_locked
#define coap_lock_check_locked(c)
Dummy for no thread-safe code.
Definition coap_threadsafe_internal.h:491
coap_log_debug
#define coap_log_debug(...)
Definition coap_debug.h:120
coap_log_warn
#define coap_log_warn(...)
Definition coap_debug.h:102
COAP_LOG_OSCORE
@ COAP_LOG_OSCORE
Definition coap_debug.h:59
coap_persist_observe_add
COAP_API coap_subscription_t * coap_persist_observe_add(coap_context_t *context, coap_proto_t e_proto, const coap_address_t *e_listen_addr, const coap_addr_tuple_t *s_addr_info, const coap_bin_const_t *raw_packet, const coap_bin_const_t *oscore_info)
Set up an active subscription for an observe that was previously active over a coap-server inadvertan...
coap_dyn_resource_added_t
int(* coap_dyn_resource_added_t)(coap_session_t *session, coap_str_const_t *resource_name, coap_bin_const_t *raw_packet, void *user_data)
Callback handler definition called when a dynamic resource is getting created, as defined in coap_per...
Definition coap_subscribe.h:149
coap_persist_set_observe_num
void coap_persist_set_observe_num(coap_resource_t *resource, uint32_t observe_num)
Sets the current observe number value.
coap_resource_deleted_t
int(* coap_resource_deleted_t)(coap_context_t *context, coap_str_const_t *resource_name, void *user_data)
Callback handler definition called when resource is removed, as defined in coap_persist_track_funcs()...
Definition coap_subscribe.h:168
coap_observe_added_t
int(* coap_observe_added_t)(coap_session_t *session, coap_subscription_t *observe_key, coap_proto_t e_proto, coap_address_t *e_listen_addr, coap_addr_tuple_t *s_addr_info, coap_bin_const_t *raw_packet, coap_bin_const_t *oscore_info, void *user_data)
Callback handler definition called when a new observe has been set up, as defined in coap_persist_tra...
Definition coap_subscribe.h:92
COAP_OBSERVE_ESTABLISH
#define COAP_OBSERVE_ESTABLISH
The value COAP_OBSERVE_ESTABLISH in a GET/FETCH request option COAP_OPTION_OBSERVE indicates a new ob...
Definition coap_subscribe.h:33
coap_persist_stop
COAP_API void coap_persist_stop(coap_context_t *context)
Stop tracking persist information, leaving the current persist information in the files defined in co...
coap_persist_track_funcs
void coap_persist_track_funcs(coap_context_t *context, coap_observe_added_t observe_added, coap_observe_deleted_t observe_deleted, coap_track_observe_value_t track_observe_value, coap_dyn_resource_added_t dyn_resource_added, coap_resource_deleted_t resource_deleted, uint32_t save_freq, void *user_data)
Set up callbacks to handle persist tracking so on a coap-server inadvertent restart,...
coap_track_observe_value_t
int(* coap_track_observe_value_t)(coap_context_t *context, coap_str_const_t *resource_name, uint32_t observe_num, void *user_data)
Callback handler definition called when an observe unsolicited response is being sent,...
Definition coap_subscribe.h:131
coap_observe_deleted_t
int(* coap_observe_deleted_t)(coap_session_t *session, coap_subscription_t *observe_key, void *user_data)
Callback handler definition called when an observe is being removed, as defined in coap_persist_track...
Definition coap_subscribe.h:112
coap_persist_startup
COAP_API int coap_persist_startup(coap_context_t *context, const char *dyn_resource_save_file, const char *observe_save_file, const char *obs_cnt_save_file, uint32_t save_freq)
Start up persist tracking using the libcoap module.
coap_opt_length
uint32_t coap_opt_length(const coap_opt_t *opt)
Returns the length of the given option.
Definition coap_option.c:212
coap_check_option
coap_opt_t * coap_check_option(const coap_pdu_t *pdu, coap_option_num_t number, coap_opt_iterator_t *oi)
Retrieves the first option of number number from pdu.
Definition coap_option.c:199
coap_opt_value
const uint8_t * coap_opt_value(const coap_opt_t *opt)
Returns a pointer to the value of the given option.
Definition coap_option.c:249
CBOR_BYTE_STRING
#define CBOR_BYTE_STRING
Definition oscore_cbor.h:62
oscore_cbor_get_element_size
size_t oscore_cbor_get_element_size(const uint8_t **buffer, size_t *buf_len)
Definition oscore_cbor.c:240
CBOR_NULL
#define CBOR_NULL
Definition oscore_cbor.h:72
CBOR_SIMPLE_VALUE
#define CBOR_SIMPLE_VALUE
Definition oscore_cbor.h:67
oscore_cbor_get_next_element
uint8_t oscore_cbor_get_next_element(const uint8_t **buffer, size_t *buf_len)
Definition oscore_cbor.c:227
CBOR_ARRAY
#define CBOR_ARRAY
Definition oscore_cbor.h:64
oscore_new_association
int oscore_new_association(coap_session_t *session, coap_pdu_t *sent_pdu, coap_bin_const_t *token, oscore_recipient_ctx_t *recipient_ctx, coap_bin_const_t *aad, coap_bin_const_t *nonce, coap_bin_const_t *partial_iv, int is_observe)
Definition oscore_context.c:687
oscore_log_hex_value
void oscore_log_hex_value(coap_log_t level, const char *name, coap_bin_const_t *value)
Definition oscore_context.c:235
oscore_find_context
oscore_ctx_t * oscore_find_context(const coap_context_t *c_context, const coap_bin_const_t rcpkey_id, const coap_bin_const_t *ctxkey_id, uint8_t *oscore_r2, oscore_recipient_ctx_t **recipient_ctx)
oscore_find_context - Locate recipient context (and hence OSCORE context)
Definition oscore_context.c:185
coap_delete_pdu
void coap_delete_pdu(coap_pdu_t *pdu)
Dispose of an CoAP PDU and frees associated storage.
Definition coap_pdu.c:183
coap_proto_t
coap_proto_t
CoAP protocol types.
Definition coap_pdu.h:312
coap_pdu_parse
int coap_pdu_parse(coap_proto_t proto, const uint8_t *data, size_t length, coap_pdu_t *pdu)
Parses data into the CoAP PDU structure given in result.
Definition coap_pdu.c:1455
coap_pdu_init
coap_pdu_t * coap_pdu_init(coap_pdu_type_t type, coap_pdu_code_t code, coap_mid_t mid, size_t size)
Creates a new CoAP PDU with at least enough storage space for the given size maximum message size.
Definition coap_pdu.c:99
COAP_OPTION_OBSERVE
#define COAP_OPTION_OBSERVE
Definition coap_pdu.h:123
COAP_PROTO_UDP
@ COAP_PROTO_UDP
Definition coap_pdu.h:314
COAP_REQUEST_CODE_GET
@ COAP_REQUEST_CODE_GET
Definition coap_pdu.h:329
COAP_REQUEST_CODE_FETCH
@ COAP_REQUEST_CODE_FETCH
Definition coap_pdu.h:333
coap_endpoint_get_session
coap_session_t * coap_endpoint_get_session(coap_endpoint_t *endpoint, const coap_packet_t *packet, coap_tick_t now)
Lookup the server session for the packet received on an endpoint, or create a new one.
coap_delete_bin_const
void coap_delete_bin_const(coap_bin_const_t *s)
Deletes the given const binary data and releases any memory allocated.
Definition coap_str.c:120
coap_new_binary
coap_binary_t * coap_new_binary(size_t size)
Returns a new binary object with at least size bytes storage allocated.
Definition coap_str.c:77
coap_new_bin_const
coap_bin_const_t * coap_new_bin_const(const uint8_t *data, size_t size)
Take the specified byte array (text) and create a coap_bin_const_t * Returns a new const binary objec...
Definition coap_str.c:110
coap_delete_binary
void coap_delete_binary(coap_binary_t *s)
Deletes the given coap_binary_t object and releases any memory allocated.
Definition coap_str.c:105
coap_binary_equal
#define coap_binary_equal(binary1, binary2)
Compares the two binary data for equality.
Definition coap_str.h:211
coap_string_equal
#define coap_string_equal(string1, string2)
Compares the two strings for equality.
Definition coap_str.h:197
coap_new_string
coap_string_t * coap_new_string(size_t size)
Returns a new string object with at least size+1 bytes storage allocated.
Definition coap_str.c:21
coap_delete_string
void coap_delete_string(coap_string_t *s)
Deletes the given string and releases any memory allocated.
Definition coap_str.c:46
coap_persist_stop_lkd
void coap_persist_stop_lkd(coap_context_t *context)
Stop tracking persist information, leaving the current persist information in the files defined in co...
coap_persist_cleanup
void coap_persist_cleanup(coap_context_t *context)
Close down persist tracking, releasing any memory used.
coap_persist_observe_add_lkd
coap_subscription_t * coap_persist_observe_add_lkd(coap_context_t *context, coap_proto_t e_proto, const coap_address_t *e_listen_addr, const coap_addr_tuple_t *s_addr_info, const coap_bin_const_t *raw_packet, const coap_bin_const_t *oscore_info)
Set up an active subscription for an observe that was previously active over a coap-server inadvertan...
coap_subscription_init
void coap_subscription_init(coap_subscription_t *)
coap_add_observer
coap_subscription_t * coap_add_observer(coap_resource_t *resource, coap_session_t *session, const coap_bin_const_t *token, const coap_pdu_t *pdu)
Adds the specified peer as observer for resource.
coap_persist_startup_lkd
int coap_persist_startup_lkd(coap_context_t *context, const char *dyn_resource_save_file, const char *observe_save_file, const char *obs_cnt_save_file, uint32_t save_freq)
Start up persist tracking using the libcoap module.
coap_observe_persist_is_supported
int coap_observe_persist_is_supported(void)
Check whether Observe Persist is available.
Definition coap_subscribe.c:24
coap_get_uri_path
coap_string_t * coap_get_uri_path(const coap_pdu_t *request)
Extract uri_path string from request PDU.
Definition coap_uri.c:990
coap_get_query
coap_string_t * coap_get_query(const coap_pdu_t *request)
Extract query string from request PDU according to escape rules in 6.5.8.
Definition coap_uri.c:939
coap_addr_tuple_t
Definition coap_io.h:55
coap_address_t
Multi-purpose address abstraction.
Definition coap_address.h:146
coap_bin_const_t
CoAP binary data definition with const data.
Definition coap_str.h:64
coap_bin_const_t::length
size_t length
length of binary data
Definition coap_str.h:65
coap_bin_const_t::s
const uint8_t * s
read-only binary data
Definition coap_str.h:66
coap_binary_t
CoAP binary data definition.
Definition coap_str.h:56
coap_binary_t::length
size_t length
length of binary data
Definition coap_str.h:57
coap_binary_t::s
uint8_t * s
binary data
Definition coap_str.h:58
coap_context_t
The CoAP stack's global state is stored in a coap_context_t object.
Definition coap_net_internal.h:50
coap_context_t::observe_added
coap_observe_added_t observe_added
Called when there is a new observe subscription request.
Definition coap_net_internal.h:113
coap_context_t::dyn_resource_added
coap_dyn_resource_added_t dyn_resource_added
Callback to save dynamic resource when created.
Definition coap_net_internal.h:122
coap_context_t::observe_user_data
void * observe_user_data
App provided data for use in observe_added or observe_deleted.
Definition coap_net_internal.h:117
coap_context_t::track_observe_value
coap_track_observe_value_t track_observe_value
Callback to save observe value when updated.
Definition coap_net_internal.h:120
coap_context_t::endpoint
coap_endpoint_t * endpoint
the endpoints used for listening
Definition coap_net_internal.h:76
coap_context_t::observe_save_freq
uint32_t observe_save_freq
How frequently to update observe value.
Definition coap_net_internal.h:119
coap_context_t::observe_no_clear
uint8_t observe_no_clear
Observe 4.04 not to be sent on deleting resource.
Definition coap_net_internal.h:191
coap_context_t::observe_deleted
coap_observe_deleted_t observe_deleted
Called when there is a observe subscription de-register request.
Definition coap_net_internal.h:115
coap_context_t::unknown_resource
coap_resource_t * unknown_resource
can be used for handling unknown resources
Definition coap_net_internal.h:55
coap_context_t::resource_deleted
coap_resource_deleted_t resource_deleted
Invoked when resource is deleted.
Definition coap_net_internal.h:124
coap_endpoint_t
Abstraction of virtual endpoint that can be attached to coap_context_t.
Definition coap_session_internal.h:237
coap_endpoint_t::next
struct coap_endpoint_t * next
Definition coap_session_internal.h:238
coap_endpoint_t::bind_addr
coap_address_t bind_addr
local interface address
Definition coap_session_internal.h:244
coap_endpoint_t::proto
coap_proto_t proto
protocol used on this interface
Definition coap_session_internal.h:240
coap_opt_iterator_t
Iterator to run through PDU options.
Definition coap_option.h:168
coap_packet_t
Definition coap_io_internal.h:225
coap_packet_t::length
size_t length
length of payload
Definition coap_io_internal.h:228
coap_packet_t::addr_info
coap_addr_tuple_t addr_info
local and remote addresses
Definition coap_io_internal.h:226
coap_packet_t::payload
unsigned char * payload
payload
Definition coap_io_internal.h:229
coap_packet_t::ifindex
int ifindex
the interface index
Definition coap_io_internal.h:227
coap_pdu_t
structure for CoAP PDUs
Definition coap_pdu_internal.h:135
coap_pdu_t::max_size
size_t max_size
maximum size for token, options and payload, or zero for variable size pdu
Definition coap_pdu_internal.h:154
coap_pdu_t::code
coap_pdu_code_t code
request method (value 1–31) or response code (value 64-255)
Definition coap_pdu_internal.h:137
coap_pdu_t::actual_token
coap_bin_const_t actual_token
Actual token in pdu.
Definition coap_pdu_internal.h:149
coap_pdu_t::used_size
size_t used_size
used bytes of storage for token, options and payload
Definition coap_pdu_internal.h:152
coap_resource_t
Abstraction of resource that can be attached to coap_context_t.
Definition coap_resource_internal.h:53
coap_resource_t::handler
coap_method_handler_t handler[7]
Used to store handlers for the seven coap methods GET, POST, PUT, DELETE, FETCH, PATCH and IPATCH.
Definition coap_resource_internal.h:69
coap_resource_t::observable
unsigned int observable
can be observed
Definition coap_resource_internal.h:57
coap_session_t
Abstraction of virtual session that can be attached to coap_context_t (client) or coap_endpoint_t (se...
Definition coap_session_internal.h:68
coap_session_t::proto
coap_proto_t proto
protocol used
Definition coap_session_internal.h:69
coap_session_t::context
coap_context_t * context
session's context
Definition coap_session_internal.h:86
coap_str_const_t
CoAP string data definition with const data.
Definition coap_str.h:46
coap_str_const_t::s
const uint8_t * s
read-only string data
Definition coap_str.h:48
coap_str_const_t::length
size_t length
length of string
Definition coap_str.h:47
coap_string_t
CoAP string data definition.
Definition coap_str.h:38
coap_string_t::s
uint8_t * s
string data
Definition coap_str.h:40
coap_subscription_t
Number of notifications that may be sent non-confirmable before a confirmable message is sent to dete...
Definition coap_subscribe_internal.h:56
oscore_ctx_t
Definition oscore_context.h:84