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authorMartin Schanzenbach <schanzen@gnunet.org>2023-10-19 12:53:29 +0200
committerMartin Schanzenbach <schanzen@gnunet.org>2023-10-19 12:53:29 +0200
commit7ef64b65a42cdb65ef2e36649ff84fcf4bb00c66 (patch)
tree975a7cebf0ed685ab776152db1be67d01171c6e5 /src/messenger/messenger_api_message.c
parent39e327905f421c470b9cbd5c1ea548261bcae026 (diff)
downloadgnunet-7ef64b65a42cdb65ef2e36649ff84fcf4bb00c66.tar.gz
gnunet-7ef64b65a42cdb65ef2e36649ff84fcf4bb00c66.zip
BUILD: Move messenger to service
Diffstat (limited to 'src/messenger/messenger_api_message.c')
-rw-r--r--src/messenger/messenger_api_message.c1026
1 files changed, 0 insertions, 1026 deletions
diff --git a/src/messenger/messenger_api_message.c b/src/messenger/messenger_api_message.c
deleted file mode 100644
index 1f7e8dbf2..000000000
--- a/src/messenger/messenger_api_message.c
+++ /dev/null
@@ -1,1026 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2020--2023 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20/**
21 * @author Tobias Frisch
22 * @file src/messenger/messenger_api_message.c
23 * @brief messenger api: client and service implementation of GNUnet MESSENGER service
24 */
25
26#include "platform.h"
27#include "messenger_api_message.h"
28
29struct GNUNET_MESSENGER_MessageSignature
30{
31 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
32 struct GNUNET_HashCode hash;
33};
34
35struct GNUNET_MESSENGER_ShortMessage
36{
37 enum GNUNET_MESSENGER_MessageKind kind;
38 struct GNUNET_MESSENGER_MessageBody body;
39};
40
41struct GNUNET_MESSENGER_Message*
42create_message (enum GNUNET_MESSENGER_MessageKind kind)
43{
44 struct GNUNET_MESSENGER_Message *message = GNUNET_new (struct
45 GNUNET_MESSENGER_Message);
46
47 message->header.kind = kind;
48
49 switch (message->header.kind)
50 {
51 case GNUNET_MESSENGER_KIND_NAME:
52 message->body.name.name = NULL;
53 break;
54 case GNUNET_MESSENGER_KIND_TEXT:
55 message->body.text.text = NULL;
56 break;
57 case GNUNET_MESSENGER_KIND_FILE:
58 message->body.file.uri = NULL;
59 break;
60 case GNUNET_MESSENGER_KIND_PRIVATE:
61 message->body.privacy.length = 0;
62 message->body.privacy.data = NULL;
63 break;
64 default:
65 break;
66 }
67
68 return message;
69}
70
71
72struct GNUNET_MESSENGER_Message*
73copy_message (const struct GNUNET_MESSENGER_Message *message)
74{
75 GNUNET_assert (message);
76
77 struct GNUNET_MESSENGER_Message *copy = GNUNET_new (struct
78 GNUNET_MESSENGER_Message);
79
80 GNUNET_memcpy (copy, message, sizeof(struct GNUNET_MESSENGER_Message));
81
82 switch (message->header.kind)
83 {
84 case GNUNET_MESSENGER_KIND_NAME:
85 copy->body.name.name = GNUNET_strdup (message->body.name.name);
86 break;
87 case GNUNET_MESSENGER_KIND_TEXT:
88 copy->body.text.text = GNUNET_strdup (message->body.text.text);
89 break;
90 case GNUNET_MESSENGER_KIND_FILE:
91 copy->body.file.uri = GNUNET_strdup (message->body.file.uri);
92 break;
93 case GNUNET_MESSENGER_KIND_PRIVATE:
94 copy->body.privacy.data = copy->body.privacy.length ? GNUNET_malloc (
95 copy->body.privacy.length) : NULL;
96
97 if (copy->body.privacy.data)
98 {
99 GNUNET_memcpy (copy->body.privacy.data, message->body.privacy.data,
100 copy->body.privacy.length);
101 }
102
103 break;
104 default:
105 break;
106 }
107
108 return copy;
109}
110
111
112static void
113destroy_message_body (enum GNUNET_MESSENGER_MessageKind kind,
114 struct GNUNET_MESSENGER_MessageBody *body)
115{
116 switch (kind)
117 {
118 case GNUNET_MESSENGER_KIND_NAME:
119 GNUNET_free (body->name.name);
120 break;
121 case GNUNET_MESSENGER_KIND_TEXT:
122 GNUNET_free (body->text.text);
123 break;
124 case GNUNET_MESSENGER_KIND_FILE:
125 GNUNET_free (body->file.uri);
126 break;
127 case GNUNET_MESSENGER_KIND_PRIVATE:
128 GNUNET_free (body->privacy.data);
129 break;
130 default:
131 break;
132 }
133}
134
135
136void
137cleanup_message (struct GNUNET_MESSENGER_Message *message)
138{
139 GNUNET_assert (message);
140
141 destroy_message_body (message->header.kind, &(message->body));
142}
143
144
145void
146destroy_message (struct GNUNET_MESSENGER_Message *message)
147{
148 GNUNET_assert (message);
149
150 destroy_message_body (message->header.kind, &(message->body));
151
152 GNUNET_free (message);
153}
154
155
156int
157is_message_session_bound (const struct GNUNET_MESSENGER_Message *message)
158{
159 GNUNET_assert (message);
160
161 if ((GNUNET_MESSENGER_KIND_JOIN == message->header.kind) ||
162 (GNUNET_MESSENGER_KIND_LEAVE == message->header.kind) ||
163 (GNUNET_MESSENGER_KIND_NAME == message->header.kind) ||
164 (GNUNET_MESSENGER_KIND_KEY == message->header.kind) ||
165 (GNUNET_MESSENGER_KIND_ID == message->header.kind))
166 return GNUNET_YES;
167 else
168 return GNUNET_NO;
169}
170
171
172static void
173fold_short_message (const struct GNUNET_MESSENGER_Message *message,
174 struct GNUNET_MESSENGER_ShortMessage *shortened)
175{
176 shortened->kind = message->header.kind;
177
178 GNUNET_memcpy (&(shortened->body), &(message->body), sizeof(struct
179 GNUNET_MESSENGER_MessageBody));
180}
181
182
183static void
184unfold_short_message (struct GNUNET_MESSENGER_ShortMessage *shortened,
185 struct GNUNET_MESSENGER_Message *message)
186{
187 destroy_message_body (message->header.kind, &(message->body));
188
189 message->header.kind = shortened->kind;
190
191 GNUNET_memcpy (&(message->body), &(shortened->body), sizeof(struct
192 GNUNET_MESSENGER_MessageBody));
193}
194
195
196#define member_size(type, member) sizeof(((type*) NULL)->member)
197
198static uint16_t
199get_message_body_kind_size (enum GNUNET_MESSENGER_MessageKind kind)
200{
201 uint16_t length = 0;
202
203 switch (kind)
204 {
205 case GNUNET_MESSENGER_KIND_INFO:
206 length += member_size (struct GNUNET_MESSENGER_Message,
207 body.info.messenger_version);
208 break;
209 case GNUNET_MESSENGER_KIND_PEER:
210 length += member_size (struct GNUNET_MESSENGER_Message, body.peer.peer);
211 break;
212 case GNUNET_MESSENGER_KIND_ID:
213 length += member_size (struct GNUNET_MESSENGER_Message, body.id.id);
214 break;
215 case GNUNET_MESSENGER_KIND_MISS:
216 length += member_size (struct GNUNET_MESSENGER_Message, body.miss.peer);
217 break;
218 case GNUNET_MESSENGER_KIND_MERGE:
219 length += member_size (struct GNUNET_MESSENGER_Message,
220 body.merge.previous);
221 break;
222 case GNUNET_MESSENGER_KIND_REQUEST:
223 length += member_size (struct GNUNET_MESSENGER_Message, body.request.hash);
224 break;
225 case GNUNET_MESSENGER_KIND_INVITE:
226 length += member_size (struct GNUNET_MESSENGER_Message, body.invite.door);
227 length += member_size (struct GNUNET_MESSENGER_Message, body.invite.key);
228 break;
229 case GNUNET_MESSENGER_KIND_TEXT:
230 break;
231 case GNUNET_MESSENGER_KIND_FILE:
232 length += member_size (struct GNUNET_MESSENGER_Message, body.file.key);
233 length += member_size (struct GNUNET_MESSENGER_Message, body.file.hash);
234 length += member_size (struct GNUNET_MESSENGER_Message, body.file.name);
235 break;
236 case GNUNET_MESSENGER_KIND_DELETE:
237 length += member_size (struct GNUNET_MESSENGER_Message, body.deletion.hash);
238 length += member_size (struct GNUNET_MESSENGER_Message,
239 body.deletion.delay);
240 break;
241 default:
242 break;
243 }
244
245 return length;
246}
247
248
249typedef uint32_t kind_t;
250
251uint16_t
252get_message_kind_size (enum GNUNET_MESSENGER_MessageKind kind,
253 int include_header)
254{
255 uint16_t length = 0;
256
257 if (GNUNET_YES == include_header)
258 {
259 length += member_size (struct GNUNET_MESSENGER_Message, header.timestamp);
260 length += member_size (struct GNUNET_MESSENGER_Message, header.sender_id);
261 length += member_size (struct GNUNET_MESSENGER_Message, header.previous);
262 }
263
264 length += sizeof(kind_t);
265
266 return length + get_message_body_kind_size (kind);
267}
268
269
270static uint16_t
271get_message_body_size (enum GNUNET_MESSENGER_MessageKind kind,
272 const struct GNUNET_MESSENGER_MessageBody *body)
273{
274 uint16_t length = 0;
275
276 switch (kind)
277 {
278 case GNUNET_MESSENGER_KIND_INFO:
279 length += GNUNET_CRYPTO_public_key_get_length (&(body->info.host_key));
280 break;
281 case GNUNET_MESSENGER_KIND_JOIN:
282 length += GNUNET_CRYPTO_public_key_get_length (&(body->join.key));
283 break;
284 case GNUNET_MESSENGER_KIND_NAME:
285 length += (body->name.name ? strlen (body->name.name) : 0);
286 break;
287 case GNUNET_MESSENGER_KIND_KEY:
288 length += GNUNET_CRYPTO_public_key_get_length (&(body->key.key));
289 break;
290 case GNUNET_MESSENGER_KIND_TEXT:
291 length += strlen (body->text.text);
292 break;
293 case GNUNET_MESSENGER_KIND_FILE:
294 length += strlen (body->file.uri);
295 break;
296 case GNUNET_MESSENGER_KIND_PRIVATE:
297 length += body->privacy.length;
298 break;
299 default:
300 break;
301 }
302
303 return length;
304}
305
306
307uint16_t
308get_message_size (const struct GNUNET_MESSENGER_Message *message,
309 int include_header)
310{
311 GNUNET_assert (message);
312
313 uint16_t length = 0;
314
315 if (GNUNET_YES == include_header)
316 length += GNUNET_CRYPTO_signature_get_length (
317 &(message->header.signature));
318
319 length += get_message_kind_size (message->header.kind, include_header);
320 length += get_message_body_size (message->header.kind, &(message->body));
321
322 return length;
323}
324
325
326static uint16_t
327get_short_message_size (const struct GNUNET_MESSENGER_ShortMessage *message,
328 int include_body)
329{
330 const uint16_t minimum_size = sizeof(struct GNUNET_HashCode) + sizeof(kind_t);
331
332 if (message)
333 return minimum_size + get_message_body_kind_size (message->kind)
334 + (include_body == GNUNET_YES? get_message_body_size (message->kind,
335 &(message->body))
336 : 0);
337 else
338 return minimum_size;
339}
340
341
342static uint16_t
343calc_usual_padding ()
344{
345 uint16_t padding = 0;
346 uint16_t kind_size;
347
348 for (int i = 0; i <= GNUNET_MESSENGER_KIND_MAX; i++)
349 {
350 kind_size = get_message_kind_size ((enum GNUNET_MESSENGER_MessageKind) i,
351 GNUNET_YES);
352
353 if (kind_size > padding)
354 padding = kind_size;
355 }
356
357 return padding + GNUNET_MESSENGER_PADDING_MIN;
358}
359
360
361#define max(x, y) (x > y? x : y)
362
363static uint16_t
364calc_padded_length (uint16_t length)
365{
366 static uint16_t usual_padding = 0;
367
368 if (! usual_padding)
369 usual_padding = calc_usual_padding ();
370
371 const uint16_t padded_length = max (
372 length + GNUNET_MESSENGER_PADDING_MIN,
373 usual_padding
374 );
375
376 if (padded_length <= GNUNET_MESSENGER_PADDING_LEVEL0)
377 return GNUNET_MESSENGER_PADDING_LEVEL0;
378
379 if (padded_length <= GNUNET_MESSENGER_PADDING_LEVEL1)
380 return GNUNET_MESSENGER_PADDING_LEVEL1;
381
382 if (padded_length <= GNUNET_MESSENGER_PADDING_LEVEL2)
383 return GNUNET_MESSENGER_PADDING_LEVEL2;
384
385 return GNUNET_MESSENGER_MAX_MESSAGE_SIZE;
386
387}
388
389
390#define min(x, y) (x < y? x : y)
391
392#define encode_step_ext(dst, offset, src, size) do { \
393 GNUNET_memcpy (dst + offset, src, size); \
394 offset += size; \
395} while (0)
396
397#define encode_step(dst, offset, src) do { \
398 encode_step_ext (dst, offset, src, sizeof(*src)); \
399} while (0)
400
401#define encode_step_key(dst, offset, src, length) do { \
402 ssize_t result = GNUNET_CRYPTO_write_public_key_to_buffer ( \
403 src, dst + offset, length - offset \
404 ); \
405 if (result < 0) \
406 GNUNET_break (0); \
407 else \
408 offset += result; \
409} while (0)
410
411#define encode_step_signature(dst, offset, src, length) do { \
412 ssize_t result = GNUNET_CRYPTO_write_signature_to_buffer ( \
413 src, dst + offset, length - offset \
414 ); \
415 if (result < 0) \
416 GNUNET_break (0); \
417 else \
418 offset += result; \
419} while (0)
420
421static void
422encode_message_body (enum GNUNET_MESSENGER_MessageKind kind,
423 const struct GNUNET_MESSENGER_MessageBody *body,
424 uint16_t length,
425 char *buffer,
426 uint16_t offset)
427{
428 uint32_t version;
429 switch (kind)
430 {
431 case GNUNET_MESSENGER_KIND_INFO:
432 version = GNUNET_htobe32 (body->info.messenger_version);
433
434 encode_step_key (buffer, offset, &(body->info.host_key), length);
435 encode_step (buffer, offset, &version);
436 break;
437 case GNUNET_MESSENGER_KIND_JOIN:
438 encode_step_key (buffer, offset, &(body->join.key), length);
439 break;
440 case GNUNET_MESSENGER_KIND_NAME:
441 if (body->name.name)
442 encode_step_ext (buffer, offset, body->name.name, min (length - offset,
443 strlen (
444 body->name.name)));
445 break;
446 case GNUNET_MESSENGER_KIND_KEY:
447 encode_step_key (buffer, offset, &(body->key.key), length);
448 break;
449 case GNUNET_MESSENGER_KIND_PEER:
450 encode_step (buffer, offset, &(body->peer.peer));
451 break;
452 case GNUNET_MESSENGER_KIND_ID:
453 encode_step (buffer, offset, &(body->id.id));
454 break;
455 case GNUNET_MESSENGER_KIND_MISS:
456 encode_step (buffer, offset, &(body->miss.peer));
457 break;
458 case GNUNET_MESSENGER_KIND_MERGE:
459 encode_step (buffer, offset, &(body->merge.previous));
460 break;
461 case GNUNET_MESSENGER_KIND_REQUEST:
462 encode_step (buffer, offset, &(body->request.hash));
463 break;
464 case GNUNET_MESSENGER_KIND_INVITE:
465 encode_step (buffer, offset, &(body->invite.door));
466 encode_step (buffer, offset, &(body->invite.key));
467 break;
468 case GNUNET_MESSENGER_KIND_TEXT:
469 encode_step_ext (buffer, offset, body->text.text, min (length - offset,
470 strlen (
471 body->text.text)));
472 break;
473 case GNUNET_MESSENGER_KIND_FILE:
474 encode_step (buffer, offset, &(body->file.key));
475 encode_step (buffer, offset, &(body->file.hash));
476 encode_step_ext (buffer, offset, body->file.name, sizeof(body->file.name));
477 encode_step_ext (buffer, offset, body->file.uri, min (length - offset,
478 strlen (
479 body->file.uri)));
480 break;
481 case GNUNET_MESSENGER_KIND_PRIVATE:
482 encode_step_ext (buffer, offset, body->privacy.data, min (length - offset,
483 body->privacy.
484 length));
485 break;
486 case GNUNET_MESSENGER_KIND_DELETE:
487 encode_step (buffer, offset, &(body->deletion.hash));
488 encode_step (buffer, offset, &(body->deletion.delay));
489 break;
490 default:
491 break;
492 }
493
494 if (offset >= length)
495 return;
496
497 const uint16_t padding = length - offset;
498 const uint16_t used_padding = sizeof(padding) + sizeof(char);
499
500 GNUNET_assert (padding >= used_padding);
501
502 buffer[offset++] = '\0';
503
504 if (padding > used_padding)
505 GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_WEAK, buffer + offset,
506 padding - used_padding);
507
508 GNUNET_memcpy (buffer + length - sizeof(padding), &padding, sizeof(padding));
509}
510
511
512void
513encode_message (const struct GNUNET_MESSENGER_Message *message,
514 uint16_t length,
515 char *buffer,
516 int include_header)
517{
518 GNUNET_assert ((message) && (buffer));
519
520 uint16_t offset = 0;
521
522 if (GNUNET_YES == include_header)
523 encode_step_signature (buffer, offset, &(message->header.signature),
524 length);
525
526 const kind_t kind = GNUNET_htobe32 ((kind_t) message->header.kind);
527
528 if (GNUNET_YES == include_header)
529 {
530 encode_step (buffer, offset, &(message->header.timestamp));
531 encode_step (buffer, offset, &(message->header.sender_id));
532 encode_step (buffer, offset, &(message->header.previous));
533 }
534
535 encode_step (buffer, offset, &kind);
536
537 encode_message_body (message->header.kind, &(message->body), length, buffer,
538 offset);
539}
540
541
542static void
543encode_short_message (const struct GNUNET_MESSENGER_ShortMessage *message,
544 uint16_t length,
545 char *buffer)
546{
547 struct GNUNET_HashCode hash;
548 uint16_t offset = sizeof(hash);
549
550 const kind_t kind = GNUNET_htobe32 ((kind_t) message->kind);
551
552 encode_step (buffer, offset, &kind);
553
554 encode_message_body (message->kind, &(message->body), length, buffer, offset);
555
556 GNUNET_CRYPTO_hash (
557 buffer + sizeof(hash),
558 length - sizeof(hash),
559 &hash
560 );
561
562 GNUNET_memcpy (buffer, &hash, sizeof(hash));
563}
564
565
566#define decode_step_ext(src, offset, dst, size) do { \
567 GNUNET_memcpy (dst, src + offset, size); \
568 offset += size; \
569} while (0)
570
571#define decode_step(src, offset, dst) do { \
572 decode_step_ext (src, offset, dst, sizeof(*dst)); \
573} while (0)
574
575#define decode_step_malloc(src, offset, dst, size, zero) do { \
576 dst = GNUNET_malloc (size + zero); \
577 if (zero) dst[size] = 0; \
578 decode_step_ext (src, offset, dst, size); \
579} while (0)
580
581#define decode_step_key(src, offset, dst, length) do { \
582 enum GNUNET_GenericReturnValue result; \
583 size_t read; \
584 result = GNUNET_CRYPTO_read_public_key_from_buffer ( \
585 src + offset, length - offset, dst, &read \
586 ); \
587 if (GNUNET_SYSERR == result) \
588 GNUNET_break (0); \
589 else \
590 offset += read; \
591} while (0)
592
593static uint16_t
594decode_message_body (enum GNUNET_MESSENGER_MessageKind *kind,
595 struct GNUNET_MESSENGER_MessageBody *body,
596 uint16_t length,
597 const char *buffer,
598 uint16_t offset)
599{
600 uint16_t padding = 0;
601
602 GNUNET_memcpy (&padding, buffer + length - sizeof(padding), sizeof(padding));
603
604 if (padding > length - offset)
605 padding = 0;
606
607 const uint16_t end_zero = length - padding;
608
609 if ((padding) && (buffer[end_zero] != '\0'))
610 padding = 0;
611
612 length -= padding;
613
614 uint32_t version;
615 switch (*kind)
616 {
617 case GNUNET_MESSENGER_KIND_INFO: {
618 decode_step_key (buffer, offset, &(body->info.host_key), length);
619 decode_step (buffer, offset, &version);
620
621 body->info.messenger_version = GNUNET_be32toh (version);
622 break;
623 } case GNUNET_MESSENGER_KIND_JOIN: {
624 decode_step_key (buffer, offset, &(body->join.key), length);
625 break;
626 } case GNUNET_MESSENGER_KIND_NAME:
627 if (length - offset > 0)
628 decode_step_malloc (buffer, offset, body->name.name, length - offset, 1);
629 else
630 body->name.name = NULL;
631 break;
632 case GNUNET_MESSENGER_KIND_KEY:
633 decode_step_key (buffer, offset, &(body->key.key), length);
634 break;
635 case GNUNET_MESSENGER_KIND_PEER:
636 decode_step (buffer, offset, &(body->peer.peer));
637 break;
638 case GNUNET_MESSENGER_KIND_ID:
639 decode_step (buffer, offset, &(body->id.id));
640 break;
641 case GNUNET_MESSENGER_KIND_MISS:
642 decode_step (buffer, offset, &(body->miss.peer));
643 break;
644 case GNUNET_MESSENGER_KIND_MERGE:
645 decode_step (buffer, offset, &(body->merge.previous));
646 break;
647 case GNUNET_MESSENGER_KIND_REQUEST:
648 decode_step (buffer, offset, &(body->request.hash));
649 break;
650 case GNUNET_MESSENGER_KIND_INVITE:
651 decode_step (buffer, offset, &(body->invite.door));
652 decode_step (buffer, offset, &(body->invite.key));
653 break;
654 case GNUNET_MESSENGER_KIND_TEXT:
655 decode_step_malloc (buffer, offset, body->text.text, length - offset, 1);
656 break;
657 case GNUNET_MESSENGER_KIND_FILE:
658 decode_step (buffer, offset, &(body->file.key));
659 decode_step (buffer, offset, &(body->file.hash));
660 decode_step_ext (buffer, offset, body->file.name, sizeof(body->file.name));
661 decode_step_malloc (buffer, offset, body->file.uri, length - offset, 1);
662 break;
663 case GNUNET_MESSENGER_KIND_PRIVATE:
664 body->privacy.length = (length - offset);
665 decode_step_malloc (buffer, offset, body->privacy.data, length - offset, 0);
666 break;
667 case GNUNET_MESSENGER_KIND_DELETE:
668 decode_step (buffer, offset, &(body->deletion.hash));
669 decode_step (buffer, offset, &(body->deletion.delay));
670 break;
671 default:
672 *kind = GNUNET_MESSENGER_KIND_UNKNOWN;
673 break;
674 }
675
676 return padding;
677}
678
679
680int
681decode_message (struct GNUNET_MESSENGER_Message *message,
682 uint16_t length,
683 const char *buffer,
684 int include_header,
685 uint16_t *padding)
686{
687 GNUNET_assert (
688 (message) &&
689 (buffer) &&
690 (length >= get_message_kind_size (GNUNET_MESSENGER_KIND_UNKNOWN,
691 include_header))
692 );
693
694 uint16_t offset = 0;
695
696 if (GNUNET_YES == include_header)
697 {
698 ssize_t result = GNUNET_CRYPTO_read_signature_from_buffer (
699 &(message->header.signature), buffer, length - offset
700 );
701
702 if (result < 0)
703 return GNUNET_NO;
704 else
705 offset += result;
706 }
707
708 const uint16_t count = length - offset;
709
710 if (count < get_message_kind_size (GNUNET_MESSENGER_KIND_UNKNOWN,
711 include_header))
712 return GNUNET_NO;
713
714 kind_t kind;
715
716 if (GNUNET_YES == include_header)
717 {
718 decode_step (buffer, offset, &(message->header.timestamp));
719 decode_step (buffer, offset, &(message->header.sender_id));
720 decode_step (buffer, offset, &(message->header.previous));
721 }
722
723 decode_step (buffer, offset, &kind);
724
725 message->header.kind = (enum GNUNET_MESSENGER_MessageKind) GNUNET_be32toh (
726 kind);
727
728 if (count < get_message_kind_size (message->header.kind, include_header))
729 return GNUNET_NO;
730
731 const uint16_t result = decode_message_body (&(message->header.kind),
732 &(message->body), length, buffer,
733 offset);
734
735 if (padding)
736 *padding = result;
737
738 return GNUNET_YES;
739}
740
741
742static int
743decode_short_message (struct GNUNET_MESSENGER_ShortMessage *message,
744 uint16_t length,
745 const char *buffer)
746{
747 struct GNUNET_HashCode expected, hash;
748 uint16_t offset = sizeof(hash);
749
750 if (length < get_short_message_size (NULL, GNUNET_NO))
751 return GNUNET_NO;
752
753 GNUNET_memcpy (&hash, buffer, sizeof(hash));
754
755 GNUNET_CRYPTO_hash (
756 buffer + sizeof(hash),
757 length - sizeof(hash),
758 &expected
759 );
760
761 if (0 != GNUNET_CRYPTO_hash_cmp (&hash, &expected))
762 return GNUNET_NO;
763
764 kind_t kind;
765
766 decode_step (buffer, offset, &kind);
767
768 message->kind = (enum GNUNET_MESSENGER_MessageKind) GNUNET_be32toh (kind);
769
770 if (length < get_short_message_size (message, GNUNET_NO))
771 return GNUNET_NO;
772
773 decode_message_body (&(message->kind), &(message->body), length, buffer,
774 offset);
775
776 if (GNUNET_MESSENGER_KIND_UNKNOWN == message->kind)
777 return GNUNET_NO;
778
779 return GNUNET_YES;
780}
781
782
783void
784hash_message (const struct GNUNET_MESSENGER_Message *message,
785 uint16_t length,
786 const char *buffer,
787 struct GNUNET_HashCode *hash)
788{
789 GNUNET_assert ((message) && (buffer) && (hash));
790
791 const ssize_t offset = GNUNET_CRYPTO_signature_get_length (
792 &(message->header.signature)
793 );
794
795 GNUNET_CRYPTO_hash (buffer + offset, length - offset, hash);
796}
797
798
799void
800sign_message (struct GNUNET_MESSENGER_Message *message,
801 uint16_t length,
802 char *buffer,
803 const struct GNUNET_HashCode *hash,
804 const struct GNUNET_MESSENGER_Ego *ego)
805{
806 GNUNET_assert ((message) && (buffer) && (hash) && (ego));
807
808 struct GNUNET_MESSENGER_MessageSignature signature;
809
810 signature.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE);
811 signature.purpose.size = htonl (sizeof(signature));
812
813 GNUNET_memcpy (&(signature.hash), hash, sizeof(struct GNUNET_HashCode));
814 GNUNET_CRYPTO_sign (&(ego->priv), &signature, &(message->header.signature));
815
816 uint16_t offset = 0;
817 encode_step_signature (buffer, offset, &(message->header.signature), length);
818}
819
820
821int
822verify_message (const struct GNUNET_MESSENGER_Message *message,
823 const struct GNUNET_HashCode *hash,
824 const struct GNUNET_CRYPTO_PublicKey *key)
825{
826 GNUNET_assert ((message) && (hash) && (key));
827
828 if (ntohl (key->type) != ntohl (message->header.signature.type))
829 return GNUNET_SYSERR;
830
831 struct GNUNET_MESSENGER_MessageSignature signature;
832
833 signature.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE);
834 signature.purpose.size = htonl (sizeof(signature));
835
836 GNUNET_memcpy (&(signature.hash), hash, sizeof(struct GNUNET_HashCode));
837
838 return GNUNET_CRYPTO_signature_verify (
839 GNUNET_SIGNATURE_PURPOSE_CHAT_MESSAGE, &signature,
840 &(message->header.signature), key);
841}
842
843
844int
845encrypt_message (struct GNUNET_MESSENGER_Message *message,
846 const struct GNUNET_CRYPTO_PublicKey *key)
847{
848 GNUNET_assert ((message) && (key));
849
850 struct GNUNET_MESSENGER_ShortMessage shortened;
851
852 fold_short_message (message, &shortened);
853
854 const uint16_t length = get_short_message_size (&shortened, GNUNET_YES);
855 const uint16_t padded_length = calc_padded_length (
856 length + GNUNET_CRYPTO_ENCRYPT_OVERHEAD_BYTES
857 );
858
859 message->header.kind = GNUNET_MESSENGER_KIND_PRIVATE;
860 message->body.privacy.data = GNUNET_malloc (padded_length);
861 message->body.privacy.length = padded_length;
862
863 const uint16_t encoded_length = (
864 padded_length - GNUNET_CRYPTO_ENCRYPT_OVERHEAD_BYTES
865 );
866
867 encode_short_message (&shortened, encoded_length, message->body.privacy.data);
868
869 if (GNUNET_OK != GNUNET_CRYPTO_encrypt (message->body.privacy.data,
870 encoded_length,
871 key,
872 message->body.privacy.data,
873 padded_length))
874 {
875 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Encrypting message failed!\n");
876
877 unfold_short_message (&shortened, message);
878 return GNUNET_NO;
879 }
880
881 destroy_message_body (shortened.kind, &(shortened.body));
882 return GNUNET_YES;
883}
884
885
886int
887decrypt_message (struct GNUNET_MESSENGER_Message *message,
888 const struct GNUNET_CRYPTO_PrivateKey *key)
889{
890 GNUNET_assert ((message) && (key));
891
892 const uint16_t padded_length = message->body.privacy.length;
893
894 if (padded_length < GNUNET_CRYPTO_ENCRYPT_OVERHEAD_BYTES)
895 {
896 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
897 "Message length too short to decrypt!\n");
898
899 return GNUNET_NO;
900 }
901
902 const uint16_t encoded_length = (
903 padded_length - GNUNET_CRYPTO_ENCRYPT_OVERHEAD_BYTES
904 );
905
906 if (GNUNET_OK != GNUNET_CRYPTO_decrypt (message->body.privacy.data,
907 padded_length,
908 key,
909 message->body.privacy.data,
910 encoded_length))
911 {
912 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Decrypting message failed!\n");
913
914 return GNUNET_NO;
915 }
916
917 struct GNUNET_MESSENGER_ShortMessage shortened;
918
919 if (GNUNET_YES != decode_short_message (&shortened,
920 encoded_length,
921 message->body.privacy.data))
922 {
923 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
924 "Decoding decrypted message failed!\n");
925
926 return GNUNET_NO;
927 }
928
929 unfold_short_message (&shortened, message);
930 return GNUNET_YES;
931}
932
933
934struct GNUNET_MQ_Envelope*
935pack_message (struct GNUNET_MESSENGER_Message *message,
936 struct GNUNET_HashCode *hash,
937 const struct GNUNET_MESSENGER_Ego *ego,
938 int mode)
939{
940 GNUNET_assert (message);
941
942 if (ego)
943 message->header.signature.type = ego->priv.type;
944
945 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
946 "Packing message kind=%u and sender: %s\n",
947 message->header.kind, GNUNET_sh2s (&(message->header.sender_id)));
948
949 struct GNUNET_MessageHeader *header;
950
951 const uint16_t length = get_message_size (message, GNUNET_YES);
952 const uint16_t padded_length = calc_padded_length (length);
953
954 struct GNUNET_MQ_Envelope *env;
955 char *buffer;
956
957 if (GNUNET_MESSENGER_PACK_MODE_ENVELOPE == mode)
958 {
959 env = GNUNET_MQ_msg_extra (header, padded_length,
960 GNUNET_MESSAGE_TYPE_CADET_CLI);
961
962 buffer = (char*) &(header[1]);
963 }
964 else
965 {
966 env = NULL;
967
968 buffer = GNUNET_malloc (padded_length);
969 }
970
971 encode_message (message, padded_length, buffer, GNUNET_YES);
972
973 if (hash)
974 {
975 hash_message (message, length, buffer, hash);
976
977 if (ego)
978 sign_message (message, length, buffer, hash, ego);
979 }
980
981 if (GNUNET_MESSENGER_PACK_MODE_ENVELOPE != mode)
982 GNUNET_free (buffer);
983
984 return env;
985}
986
987
988int
989filter_message_sending (const struct GNUNET_MESSENGER_Message *message)
990{
991 switch (message->header.kind)
992 {
993 case GNUNET_MESSENGER_KIND_INFO:
994 return GNUNET_SYSERR; // Reserved for connection handling only!
995 case GNUNET_MESSENGER_KIND_JOIN:
996 return GNUNET_NO; // Use #GNUNET_MESSENGER_enter_room(...) instead!
997 case GNUNET_MESSENGER_KIND_LEAVE:
998 return GNUNET_NO; // Use #GNUNET_MESSENGER_close_room(...) instead!
999 case GNUNET_MESSENGER_KIND_NAME:
1000 return GNUNET_YES;
1001 case GNUNET_MESSENGER_KIND_KEY:
1002 return GNUNET_NO; // Use #GNUNET_MESSENGER_update(...) instead!
1003 case GNUNET_MESSENGER_KIND_PEER:
1004 return GNUNET_NO; // Use #GNUNET_MESSENGER_open_room(...) instead!
1005 case GNUNET_MESSENGER_KIND_ID:
1006 return GNUNET_SYSERR; // Reserved for member id handling only!
1007 case GNUNET_MESSENGER_KIND_MISS:
1008 return GNUNET_SYSERR; // Reserved for connection handling only!
1009 case GNUNET_MESSENGER_KIND_MERGE:
1010 return GNUNET_YES;
1011 case GNUNET_MESSENGER_KIND_REQUEST:
1012 return GNUNET_YES;
1013 case GNUNET_MESSENGER_KIND_INVITE:
1014 return GNUNET_YES;
1015 case GNUNET_MESSENGER_KIND_TEXT:
1016 return GNUNET_YES;
1017 case GNUNET_MESSENGER_KIND_FILE:
1018 return GNUNET_YES;
1019 case GNUNET_MESSENGER_KIND_PRIVATE:
1020 return GNUNET_NO; // Use #GNUNET_MESSENGER_send_message(...) with a contact instead!
1021 case GNUNET_MESSENGER_KIND_DELETE:
1022 return GNUNET_YES;
1023 default:
1024 return GNUNET_SYSERR;
1025 }
1026}
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-28 05:11:45 +0000