diff options
Diffstat (limited to 'src/service/messenger/gnunet-service-messenger_tunnel.c')
-rw-r--r-- | src/service/messenger/gnunet-service-messenger_tunnel.c | 441 |
1 files changed, 441 insertions, 0 deletions
diff --git a/src/service/messenger/gnunet-service-messenger_tunnel.c b/src/service/messenger/gnunet-service-messenger_tunnel.c new file mode 100644 index 000000000..98d0ab1ce --- /dev/null +++ b/src/service/messenger/gnunet-service-messenger_tunnel.c | |||
@@ -0,0 +1,441 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | Copyright (C) 2020--2024 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/gnunet-service-messenger_tunnel.c | ||
23 | * @brief GNUnet MESSENGER service | ||
24 | */ | ||
25 | |||
26 | #include "gnunet-service-messenger_tunnel.h" | ||
27 | |||
28 | #include "gnunet-service-messenger_handle.h" | ||
29 | #include "gnunet-service-messenger_message_recv.h" | ||
30 | #include "gnunet-service-messenger_message_store.h" | ||
31 | #include "gnunet-service-messenger_operation_store.h" | ||
32 | #include "gnunet-service-messenger_operation.h" | ||
33 | |||
34 | #include "messenger_api_util.h" | ||
35 | |||
36 | struct GNUNET_MESSENGER_SrvTunnel* | ||
37 | create_tunnel (struct GNUNET_MESSENGER_SrvRoom *room, | ||
38 | const struct GNUNET_PeerIdentity *door) | ||
39 | { | ||
40 | GNUNET_assert ((room) && (door)); | ||
41 | |||
42 | struct GNUNET_MESSENGER_SrvTunnel *tunnel = GNUNET_new (struct | ||
43 | GNUNET_MESSENGER_SrvTunnel); | ||
44 | |||
45 | tunnel->room = room; | ||
46 | tunnel->channel = NULL; | ||
47 | |||
48 | tunnel->peer = GNUNET_PEER_intern (door); | ||
49 | |||
50 | tunnel->messenger_version = 0; | ||
51 | |||
52 | tunnel->peer_message = NULL; | ||
53 | |||
54 | init_message_state (&(tunnel->state)); | ||
55 | |||
56 | return tunnel; | ||
57 | } | ||
58 | |||
59 | |||
60 | void | ||
61 | destroy_tunnel (struct GNUNET_MESSENGER_SrvTunnel *tunnel) | ||
62 | { | ||
63 | GNUNET_assert (tunnel); | ||
64 | |||
65 | if (tunnel->channel) | ||
66 | GNUNET_CADET_channel_destroy (tunnel->channel); | ||
67 | |||
68 | GNUNET_PEER_change_rc (tunnel->peer, -1); | ||
69 | |||
70 | if (tunnel->peer_message) | ||
71 | GNUNET_free (tunnel->peer_message); | ||
72 | |||
73 | clear_message_state (&(tunnel->state)); | ||
74 | |||
75 | GNUNET_free (tunnel); | ||
76 | } | ||
77 | |||
78 | |||
79 | void | ||
80 | bind_tunnel (struct GNUNET_MESSENGER_SrvTunnel *tunnel, | ||
81 | struct GNUNET_CADET_Channel *channel) | ||
82 | { | ||
83 | GNUNET_assert (tunnel); | ||
84 | |||
85 | if (tunnel->channel) | ||
86 | delayed_disconnect_channel (tunnel->channel); | ||
87 | |||
88 | tunnel->channel = channel; | ||
89 | } | ||
90 | |||
91 | |||
92 | extern void | ||
93 | callback_room_disconnect (struct GNUNET_MESSENGER_SrvRoom *room, | ||
94 | void *cls); | ||
95 | |||
96 | void | ||
97 | callback_tunnel_disconnect (void *cls, | ||
98 | const struct GNUNET_CADET_Channel *channel) | ||
99 | { | ||
100 | struct GNUNET_MESSENGER_SrvTunnel *tunnel = cls; | ||
101 | |||
102 | if (tunnel) | ||
103 | { | ||
104 | tunnel->channel = NULL; | ||
105 | |||
106 | callback_room_disconnect (tunnel->room, cls); | ||
107 | } | ||
108 | } | ||
109 | |||
110 | |||
111 | extern enum GNUNET_GenericReturnValue | ||
112 | callback_verify_room_message (struct GNUNET_MESSENGER_SrvRoom *room, | ||
113 | void *cls, | ||
114 | struct GNUNET_MESSENGER_Message *message, | ||
115 | struct GNUNET_HashCode *hash); | ||
116 | |||
117 | enum GNUNET_GenericReturnValue | ||
118 | check_tunnel_message (void *cls, | ||
119 | const struct GNUNET_MessageHeader *header) | ||
120 | { | ||
121 | struct GNUNET_MESSENGER_SrvTunnel *tunnel = cls; | ||
122 | |||
123 | if (! tunnel) | ||
124 | return GNUNET_SYSERR; | ||
125 | |||
126 | const uint16_t length = ntohs (header->size) - sizeof(*header); | ||
127 | const char *buffer = (const char*) &header[1]; | ||
128 | |||
129 | struct GNUNET_MESSENGER_Message message; | ||
130 | |||
131 | if (length < get_message_kind_size (GNUNET_MESSENGER_KIND_UNKNOWN, | ||
132 | GNUNET_YES)) | ||
133 | { | ||
134 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, | ||
135 | "Tunnel error: Message too short! (%d)\n", length); | ||
136 | return GNUNET_SYSERR; | ||
137 | } | ||
138 | |||
139 | uint16_t padding = 0; | ||
140 | |||
141 | if (GNUNET_YES != decode_message (&message, length, buffer, GNUNET_YES, | ||
142 | &padding)) | ||
143 | { | ||
144 | GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel error: Decoding failed!\n"); | ||
145 | return GNUNET_SYSERR; | ||
146 | } | ||
147 | |||
148 | struct GNUNET_HashCode hash; | ||
149 | hash_message (&message, length - padding, buffer, &hash); | ||
150 | |||
151 | return callback_verify_room_message (tunnel->room, cls, &message, &hash); | ||
152 | } | ||
153 | |||
154 | |||
155 | extern enum GNUNET_GenericReturnValue | ||
156 | update_room_message (struct GNUNET_MESSENGER_SrvRoom *room, | ||
157 | struct GNUNET_MESSENGER_Message *message, | ||
158 | const struct GNUNET_HashCode *hash); | ||
159 | |||
160 | extern void | ||
161 | callback_room_handle_message (struct GNUNET_MESSENGER_SrvRoom *room, | ||
162 | const struct GNUNET_MESSENGER_Message *message, | ||
163 | const struct GNUNET_HashCode *hash); | ||
164 | |||
165 | static void | ||
166 | update_tunnel_last_message (struct GNUNET_MESSENGER_SrvTunnel *tunnel, | ||
167 | const struct GNUNET_HashCode *hash) | ||
168 | { | ||
169 | struct GNUNET_MESSENGER_OperationStore *operation_store = | ||
170 | get_srv_room_operation_store (tunnel->room); | ||
171 | |||
172 | enum GNUNET_GenericReturnValue requested; | ||
173 | requested = (GNUNET_MESSENGER_OP_REQUEST == | ||
174 | get_store_operation_type (operation_store, hash)? | ||
175 | GNUNET_YES : GNUNET_NO); | ||
176 | |||
177 | struct GNUNET_MESSENGER_MessageStore *message_store = | ||
178 | get_srv_room_message_store (tunnel->room); | ||
179 | |||
180 | const struct GNUNET_MESSENGER_Message *message = get_store_message ( | ||
181 | message_store, hash); | ||
182 | |||
183 | if (message) | ||
184 | update_message_state (&(tunnel->state), requested, message, hash); | ||
185 | } | ||
186 | |||
187 | |||
188 | void | ||
189 | handle_tunnel_message (void *cls, const struct GNUNET_MessageHeader *header) | ||
190 | { | ||
191 | struct GNUNET_MESSENGER_SrvTunnel *tunnel = cls; | ||
192 | |||
193 | if (! tunnel) | ||
194 | return; | ||
195 | |||
196 | const uint16_t length = ntohs (header->size) - sizeof(*header); | ||
197 | const char *buffer = (const char*) &header[1]; | ||
198 | |||
199 | struct GNUNET_MESSENGER_Message message; | ||
200 | struct GNUNET_HashCode hash; | ||
201 | |||
202 | uint16_t padding = 0; | ||
203 | |||
204 | decode_message (&message, length, buffer, GNUNET_YES, &padding); | ||
205 | hash_message (&message, length - padding, buffer, &hash); | ||
206 | |||
207 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got message of kind: %s!\n", | ||
208 | GNUNET_MESSENGER_name_of_kind (message.header.kind)); | ||
209 | |||
210 | enum GNUNET_GenericReturnValue new_message; | ||
211 | new_message = update_room_message (tunnel->room, | ||
212 | copy_message (&message), | ||
213 | &hash); | ||
214 | |||
215 | if (GNUNET_YES != new_message) | ||
216 | goto receive_done; | ||
217 | |||
218 | update_tunnel_last_message (tunnel, &hash); | ||
219 | |||
220 | enum GNUNET_GenericReturnValue forward_message = GNUNET_YES; | ||
221 | |||
222 | switch (message.header.kind) | ||
223 | { | ||
224 | case GNUNET_MESSENGER_KIND_INFO: | ||
225 | forward_message = recv_message_info (tunnel->room, tunnel, &message, &hash); | ||
226 | break; | ||
227 | case GNUNET_MESSENGER_KIND_PEER: | ||
228 | forward_message = recv_message_peer (tunnel->room, tunnel, &message, &hash); | ||
229 | break; | ||
230 | case GNUNET_MESSENGER_KIND_MISS: | ||
231 | forward_message = recv_message_miss (tunnel->room, tunnel, &message, &hash); | ||
232 | break; | ||
233 | case GNUNET_MESSENGER_KIND_REQUEST: | ||
234 | forward_message = recv_message_request (tunnel->room, tunnel, &message, | ||
235 | &hash); | ||
236 | break; | ||
237 | default: | ||
238 | break; | ||
239 | } | ||
240 | |||
241 | if (GNUNET_YES == forward_message) | ||
242 | { | ||
243 | forward_srv_room_message (tunnel->room, tunnel, &message, &hash); | ||
244 | callback_room_handle_message (tunnel->room, &message, &hash); | ||
245 | } | ||
246 | |||
247 | receive_done: | ||
248 | cleanup_message (&message); | ||
249 | |||
250 | GNUNET_CADET_receive_done (tunnel->channel); | ||
251 | } | ||
252 | |||
253 | |||
254 | enum GNUNET_GenericReturnValue | ||
255 | connect_tunnel (struct GNUNET_MESSENGER_SrvTunnel *tunnel) | ||
256 | { | ||
257 | GNUNET_assert (tunnel); | ||
258 | |||
259 | if (tunnel->channel) | ||
260 | return GNUNET_NO; | ||
261 | |||
262 | const struct GNUNET_PeerIdentity *door = GNUNET_PEER_resolve2 (tunnel->peer); | ||
263 | |||
264 | struct GNUNET_CADET_Handle *cadet = get_srv_room_cadet (tunnel->room); | ||
265 | const struct GNUNET_HashCode *key = get_srv_room_key (tunnel->room); | ||
266 | |||
267 | struct GNUNET_MQ_MessageHandler handlers[] = { GNUNET_MQ_hd_var_size ( | ||
268 | tunnel_message, | ||
269 | GNUNET_MESSAGE_TYPE_CADET_CLI, | ||
270 | struct | ||
271 | GNUNET_MessageHeader, NULL), | ||
272 | GNUNET_MQ_handler_end () }; | ||
273 | |||
274 | struct GNUNET_HashCode port; | ||
275 | convert_messenger_key_to_port (key, &port); | ||
276 | tunnel->channel = GNUNET_CADET_channel_create (cadet, tunnel, door, &port, | ||
277 | NULL, | ||
278 | callback_tunnel_disconnect, | ||
279 | handlers); | ||
280 | |||
281 | return GNUNET_YES; | ||
282 | } | ||
283 | |||
284 | |||
285 | void | ||
286 | disconnect_tunnel (struct GNUNET_MESSENGER_SrvTunnel *tunnel) | ||
287 | { | ||
288 | GNUNET_assert (tunnel); | ||
289 | |||
290 | if (tunnel->channel) | ||
291 | { | ||
292 | delayed_disconnect_channel (tunnel->channel); | ||
293 | |||
294 | tunnel->channel = NULL; | ||
295 | } | ||
296 | } | ||
297 | |||
298 | |||
299 | enum GNUNET_GenericReturnValue | ||
300 | is_tunnel_connected (const struct GNUNET_MESSENGER_SrvTunnel *tunnel) | ||
301 | { | ||
302 | GNUNET_assert (tunnel); | ||
303 | |||
304 | return (tunnel->channel ? GNUNET_YES : GNUNET_NO); | ||
305 | } | ||
306 | |||
307 | |||
308 | struct GNUNET_MESSENGER_MessageSent | ||
309 | { | ||
310 | struct GNUNET_MESSENGER_SrvTunnel *tunnel; | ||
311 | struct GNUNET_HashCode hash; | ||
312 | }; | ||
313 | |||
314 | static void | ||
315 | callback_tunnel_sent (void *cls) | ||
316 | { | ||
317 | struct GNUNET_MESSENGER_MessageSent *sent = cls; | ||
318 | |||
319 | if (sent->tunnel) | ||
320 | update_tunnel_last_message (sent->tunnel, &(sent->hash)); | ||
321 | |||
322 | GNUNET_free (sent); | ||
323 | } | ||
324 | |||
325 | |||
326 | void | ||
327 | send_tunnel_envelope (struct GNUNET_MESSENGER_SrvTunnel *tunnel, | ||
328 | struct GNUNET_MQ_Envelope *env, | ||
329 | const struct GNUNET_HashCode *hash) | ||
330 | { | ||
331 | GNUNET_assert ((tunnel) && (env) && (hash)); | ||
332 | |||
333 | struct GNUNET_MQ_Handle *mq = GNUNET_CADET_get_mq (tunnel->channel); | ||
334 | |||
335 | struct GNUNET_MESSENGER_MessageSent *sent = GNUNET_new (struct | ||
336 | GNUNET_MESSENGER_MessageSent); | ||
337 | |||
338 | GNUNET_memcpy (&(sent->hash), hash, sizeof(struct GNUNET_HashCode)); | ||
339 | |||
340 | sent->tunnel = tunnel; | ||
341 | |||
342 | GNUNET_MQ_notify_sent (env, callback_tunnel_sent, sent); | ||
343 | GNUNET_MQ_send (mq, env); | ||
344 | } | ||
345 | |||
346 | |||
347 | enum GNUNET_GenericReturnValue | ||
348 | send_tunnel_message (struct GNUNET_MESSENGER_SrvTunnel *tunnel, | ||
349 | void *handle, | ||
350 | struct GNUNET_MESSENGER_Message *message) | ||
351 | { | ||
352 | GNUNET_assert ((tunnel) && (handle)); | ||
353 | |||
354 | if (! message) | ||
355 | return GNUNET_NO; | ||
356 | |||
357 | struct GNUNET_HashCode hash; | ||
358 | struct GNUNET_MQ_Envelope *env = pack_srv_room_message ( | ||
359 | tunnel->room, (struct GNUNET_MESSENGER_SrvHandle*) handle, | ||
360 | message, &hash, GNUNET_MESSENGER_PACK_MODE_ENVELOPE | ||
361 | ); | ||
362 | |||
363 | destroy_message (message); | ||
364 | |||
365 | if (! env) | ||
366 | return GNUNET_NO; | ||
367 | |||
368 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending tunnel message: %s\n", | ||
369 | GNUNET_h2s (&hash)); | ||
370 | |||
371 | send_tunnel_envelope (tunnel, env, &hash); | ||
372 | return GNUNET_YES; | ||
373 | } | ||
374 | |||
375 | |||
376 | void | ||
377 | forward_tunnel_message (struct GNUNET_MESSENGER_SrvTunnel *tunnel, | ||
378 | const struct GNUNET_MESSENGER_Message *message, | ||
379 | const struct GNUNET_HashCode *hash) | ||
380 | { | ||
381 | GNUNET_assert ((tunnel) && (message) && (hash)); | ||
382 | |||
383 | struct GNUNET_MESSENGER_Message *copy = copy_message (message); | ||
384 | struct GNUNET_MQ_Envelope *env = pack_message (copy, NULL, NULL, | ||
385 | GNUNET_MESSENGER_PACK_MODE_ENVELOPE, | ||
386 | NULL); | ||
387 | |||
388 | destroy_message (copy); | ||
389 | |||
390 | if (! env) | ||
391 | return; | ||
392 | |||
393 | GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Forwarding tunnel message: %s\n", | ||
394 | GNUNET_h2s (hash)); | ||
395 | |||
396 | send_tunnel_envelope (tunnel, env, hash); | ||
397 | } | ||
398 | |||
399 | |||
400 | const struct GNUNET_HashCode* | ||
401 | get_tunnel_peer_message (const struct GNUNET_MESSENGER_SrvTunnel *tunnel) | ||
402 | { | ||
403 | GNUNET_assert (tunnel); | ||
404 | |||
405 | return tunnel->peer_message; | ||
406 | } | ||
407 | |||
408 | |||
409 | void | ||
410 | get_tunnel_peer_identity (const struct GNUNET_MESSENGER_SrvTunnel *tunnel, | ||
411 | struct GNUNET_PeerIdentity *peer) | ||
412 | { | ||
413 | GNUNET_assert (tunnel); | ||
414 | |||
415 | GNUNET_PEER_resolve (tunnel->peer, peer); | ||
416 | } | ||
417 | |||
418 | |||
419 | uint32_t | ||
420 | get_tunnel_messenger_version (const struct GNUNET_MESSENGER_SrvTunnel *tunnel) | ||
421 | { | ||
422 | GNUNET_assert (tunnel); | ||
423 | |||
424 | return tunnel->messenger_version; | ||
425 | } | ||
426 | |||
427 | |||
428 | enum GNUNET_GenericReturnValue | ||
429 | update_tunnel_messenger_version (struct GNUNET_MESSENGER_SrvTunnel *tunnel, | ||
430 | uint32_t version) | ||
431 | { | ||
432 | GNUNET_assert (tunnel); | ||
433 | |||
434 | if (version != GNUNET_MESSENGER_VERSION) | ||
435 | return GNUNET_SYSERR; | ||
436 | |||
437 | if (version > tunnel->messenger_version) | ||
438 | tunnel->messenger_version = version; | ||
439 | |||
440 | return GNUNET_OK; | ||
441 | } | ||