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1/*
2 This file is part of GNUnet.
3 (C) 2013 Christian Grothoff (and other contributing authors)
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 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 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet_peer.h
23 * @brief cadet service; dealing with remote peers
24 * @author Bartlomiej Polot
25 *
26 * All functions in this file should use the prefix GMP (Gnunet Cadet Peer)
27 */
28
29#ifndef GNUNET_SERVICE_CADET_PEER_H
30#define GNUNET_SERVICE_CADET_PEER_H
31
32#ifdef __cplusplus
33extern "C"
34{
35#if 0 /* keep Emacsens' auto-indent happy */
36}
37#endif
38#endif
39
40#include "platform.h"
41#include "gnunet_util_lib.h"
42
43/**
44 * Struct containing all information regarding a given peer
45 */
46struct CadetPeer;
47
48/**
49 * Struct containing info about a queued transmission to this peer
50 */
51struct CadetPeerQueue;
52
53#include "gnunet-service-cadet_connection.h"
54
55/**
56 * Callback called when a queued message is sent.
57 *
58 * @param cls Closure.
59 * @param c Connection this message was on.
60 * @param sent Was it really sent? (Could have been canceled)
61 * @param type Type of message sent.
62 * @param pid Packet ID, or 0 if not applicable (create, destroy, etc).
63 * @param fwd Was this a FWD going message?
64 * @param size Size of the message.
65 * @param wait Time spent waiting for core (only the time for THIS message)
66 */
67typedef void (*GMP_sent) (void *cls,
68 struct CadetConnection *c, int sent,
69 uint16_t type, uint32_t pid, int fwd, size_t size,
70 struct GNUNET_TIME_Relative wait);
71
72/******************************************************************************/
73/******************************** API ***********************************/
74/******************************************************************************/
75
76/**
77 * Initialize peer subsystem.
78 *
79 * @param c Configuration.
80 */
81void
82GMP_init (const struct GNUNET_CONFIGURATION_Handle *c);
83
84/**
85 * Shut down the peer subsystem.
86 */
87void
88GMP_shutdown (void);
89
90
91/**
92 * Retrieve the CadetPeer stucture associated with the peer, create one
93 * and insert it in the appropriate structures if the peer is not known yet.
94 *
95 * @param peer_id Full identity of the peer.
96 *
97 * @return Existing or newly created peer structure.
98 */
99struct CadetPeer *
100GMP_get (const struct GNUNET_PeerIdentity *peer_id);
101
102
103/**
104 * Retrieve the CadetPeer stucture associated with the peer, create one
105 * and insert it in the appropriate structures if the peer is not known yet.
106 *
107 * @param peer Short identity of the peer.
108 *
109 * @return Existing or newly created peer structure.
110 */
111struct CadetPeer *
112GMP_get_short (const GNUNET_PEER_Id peer);
113
114/**
115 * Try to establish a new connection to this peer (in its tunnel).
116 * If the peer doesn't have any path to it yet, try to get one.
117 * If the peer already has some path, send a CREATE CONNECTION towards it.
118 *
119 * @param peer Peer to connect to.
120 */
121void
122GMP_connect (struct CadetPeer *peer);
123
124/**
125 * Free a transmission that was already queued with all resources
126 * associated to the request.
127 *
128 * @param queue Queue handler to cancel.
129 * @param clear_cls Is it necessary to free associated cls?
130 * @param sent Was it really sent? (Could have been canceled)
131 * @param pid PID, if relevant (was sent and was a payload message).
132 */
133void
134GMP_queue_destroy (struct CadetPeerQueue *queue, int clear_cls,
135 int sent, uint32_t pid);
136
137/**
138 * @brief Queue and pass message to core when possible.
139 *
140 * @param peer Peer towards which to queue the message.
141 * @param cls Closure (@c type dependant). It will be used by queue_send to
142 * build the message to be sent if not already prebuilt.
143 * @param type Type of the message, 0 for a raw message.
144 * @param size Size of the message.
145 * @param c Connection this message belongs to (cannot be NULL).
146 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
147 * @param cont Continuation to be called once CORE has taken the message.
148 * @param cont_cls Closure for @c cont.
149 *
150 * @return Handle to cancel the message before it is sent. Once cont is called
151 * message has been sent and therefore the handle is no longer valid.
152 */
153struct CadetPeerQueue *
154GMP_queue_add (struct CadetPeer *peer, void *cls, uint16_t type,
155 uint16_t payload_type, uint32_t payload_id,
156 size_t size, struct CadetConnection *c, int fwd,
157 GMP_sent cont, void *cont_cls);
158
159/**
160 * Cancel all queued messages to a peer that belong to a certain connection.
161 *
162 * @param peer Peer towards whom to cancel.
163 * @param c Connection whose queued messages to cancel. Might be destroyed by
164 * the sent continuation call.
165 */
166void
167GMP_queue_cancel (struct CadetPeer *peer, struct CadetConnection *c);
168
169/**
170 * Get the first message for a connection and unqueue it.
171 *
172 * @param peer Neighboring peer.
173 * @param c Connection.
174 *
175 * @return First message for this connection.
176 */
177struct GNUNET_MessageHeader *
178GMP_connection_pop (struct CadetPeer *peer, struct CadetConnection *c);
179
180void
181GMP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c);
182
183/**
184 * Set tunnel.
185 *
186 * @param peer Peer.
187 * @param t Tunnel.
188 */
189void
190GMP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel3 *t);
191
192/**
193 * Check whether there is a direct (core level) connection to peer.
194 *
195 * @param peer Peer to check.
196 *
197 * @return #GNUNET_YES if there is a direct connection.
198 */
199int
200GMP_is_neighbor (const struct CadetPeer *peer);
201
202/**
203 * Create and initialize a new tunnel towards a peer, in case it has none.
204 *
205 * Does not generate any traffic, just creates the local data structures.
206 *
207 * @param peer Peer towards which to create the tunnel.
208 */
209void
210GMP_add_tunnel (struct CadetPeer *peer);
211
212/**
213 * Add a connection to a neighboring peer.
214 *
215 * Store that the peer is the first hop of the connection in one
216 * direction and that on peer disconnect the connection must be
217 * notified and destroyed, for it will no longer be valid.
218 *
219 * @param peer Peer to add connection to.
220 * @param c Connection to add.
221 *
222 * @return GNUNET_OK on success.
223 */
224int
225GMP_add_connection (struct CadetPeer *peer, struct CadetConnection *c);
226
227/**
228 * Add the path to the peer and update the path used to reach it in case this
229 * is the shortest.
230 *
231 * @param peer Destination peer to add the path to.
232 * @param path New path to add. Last peer must be the peer in arg 1.
233 * Path will be either used of freed if already known.
234 * @param trusted Do we trust that this path is real?
235 *
236 * @return path if path was taken, pointer to existing duplicate if exists
237 * NULL on error.
238 */
239struct CadetPeerPath *
240GMP_add_path (struct CadetPeer *peer, struct CadetPeerPath *p, int trusted);
241
242/**
243 * Add the path to the origin peer and update the path used to reach it in case
244 * this is the shortest.
245 * The path is given in peer_info -> destination, therefore we turn the path
246 * upside down first.
247 *
248 * @param peer Peer to add the path to, being the origin of the path.
249 * @param path New path to add after being inversed.
250 * Path will be either used or freed.
251 * @param trusted Do we trust that this path is real?
252 *
253 * @return path if path was taken, pointer to existing duplicate if exists
254 * NULL on error.
255 */
256struct CadetPeerPath *
257GMP_add_path_to_origin (struct CadetPeer *peer,
258 struct CadetPeerPath *path,
259 int trusted);
260
261/**
262 * Adds a path to the info of all the peers in the path
263 *
264 * @param p Path to process.
265 * @param confirmed Whether we know if the path works or not.
266 */
267void
268GMP_add_path_to_all (const struct CadetPeerPath *p, int confirmed);
269
270/**
271 * Remove any path to the peer that has the extact same peers as the one given.
272 *
273 * @param peer Peer to remove the path from.
274 * @param path Path to remove. Is always destroyed .
275 */
276void
277GMP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path);
278
279/**
280 * Remove a connection from a neighboring peer.
281 *
282 * @param peer Peer to remove connection from.
283 * @param c Connection to remove.
284 *
285 * @return GNUNET_OK on success.
286 */
287int
288GMP_remove_connection (struct CadetPeer *peer, const struct CadetConnection *c);
289
290/**
291 * Start the DHT search for new paths towards the peer: we don't have
292 * enough good connections.
293 *
294 * @param peer Destination peer.
295 */
296void
297GMP_start_search (struct CadetPeer *peer);
298
299/**
300 * Stop the DHT search for new paths towards the peer: we already have
301 * enough good connections.
302 *
303 * @param peer Destination peer.
304 */
305void
306GMP_stop_search (struct CadetPeer *peer);
307
308/**
309 * Get the Full ID of a peer.
310 *
311 * @param peer Peer to get from.
312 *
313 * @return Full ID of peer.
314 */
315const struct GNUNET_PeerIdentity *
316GMP_get_id (const struct CadetPeer *peer);
317
318/**
319 * Get the Short ID of a peer.
320 *
321 * @param peer Peer to get from.
322 *
323 * @return Short ID of peer.
324 */
325GNUNET_PEER_Id
326GMP_get_short_id (const struct CadetPeer *peer);
327
328/**
329 * Get the tunnel towards a peer.
330 *
331 * @param peer Peer to get from.
332 *
333 * @return Tunnel towards peer.
334 */
335struct CadetTunnel3 *
336GMP_get_tunnel (const struct CadetPeer *peer);
337
338/**
339 * Set the hello message.
340 *
341 * @param peer Peer whose message to set.
342 * @param hello Hello message.
343 */
344void
345GMP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello);
346
347/**
348 * Get the hello message.
349 *
350 * @param peer Peer whose message to get.
351 *
352 * @return Hello message.
353 */
354struct GNUNET_HELLO_Message *
355GMP_get_hello (struct CadetPeer *peer);
356
357
358/**
359 * Try to connect to a peer on TRANSPORT level.
360 *
361 * @param peer Peer to whom to connect.
362 */
363void
364GMP_try_connect (struct CadetPeer *peer);
365
366/**
367 * Notify a peer that a link between two other peers is broken. If any path
368 * used that link, eliminate it.
369 *
370 * @param peer Peer affected by the change.
371 * @param peer1 Peer whose link is broken.
372 * @param peer2 Peer whose link is broken.
373 */
374void
375GMP_notify_broken_link (struct CadetPeer *peer,
376 struct GNUNET_PeerIdentity *peer1,
377 struct GNUNET_PeerIdentity *peer2);
378
379/**
380 * Count the number of known paths toward the peer.
381 *
382 * @param peer Peer to get path info.
383 *
384 * @return Number of known paths.
385 */
386unsigned int
387GMP_count_paths (const struct CadetPeer *peer);
388
389/**
390 * Iterate all known peers.
391 *
392 * @param iter Iterator.
393 * @param cls Closure for @c iter.
394 */
395void
396GMP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls);
397
398/**
399 * Get the static string for a peer ID.
400 *
401 * @param peer Peer.
402 *
403 * @return Static string for it's ID.
404 */
405const char *
406GMP_2s (const struct CadetPeer *peer);
407
408
409#if 0 /* keep Emacsens' auto-indent happy */
410{
411#endif
412#ifdef __cplusplus
413}
414#endif
415
416/* ifndef GNUNET_CADET_SERVICE_PEER_H */
417#endif
418/* end of gnunet-cadet-service_peer.h */