2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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.
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.
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.
22 * @file transport/transport_api_peer_address_lookup.c
23 * @brief given a peer id, get all known addresses from transport service
25 * This api provides the ability to query the transport service about
26 * the status of connections to a specific peer. Calls back with a
27 * pretty printed string of the address, as formatted by the appropriate
28 * transport plugin, and whether or not the address given is currently
29 * in the 'connected' state (according to the transport service).
33 #include "gnunet_client_lib.h"
34 #include "gnunet_arm_service.h"
35 #include "gnunet_hello_lib.h"
36 #include "gnunet_protocols.h"
37 #include "gnunet_server_lib.h"
38 #include "gnunet_time_lib.h"
39 #include "gnunet_transport_service.h"
40 #include "transport.h"
43 * Context for the address lookup.
45 struct GNUNET_TRANSPORT_PeerAddressLookupContext
48 * Function to call with the human-readable address.
50 GNUNET_TRANSPORT_AddressLookUpCallback cb;
58 * Connection to the service.
60 struct GNUNET_CLIENT_Connection *client;
63 * When should this operation time out?
65 struct GNUNET_TIME_Absolute timeout;
70 * Function called with responses from the service.
72 * @param cls our 'struct GNUNET_TRANSPORT_PeerAddressLookupContext*'
73 * @param msg NULL on timeout or error, otherwise presumably a
74 * message with the human-readable address
77 peer_address_response_processor (void *cls,
78 const struct GNUNET_MessageHeader *msg)
80 struct GNUNET_TRANSPORT_PeerAddressLookupContext *alucb = cls;
81 const struct GNUNET_HELLO_Address *address;
86 alucb->cb (alucb->cb_cls, NULL);
87 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
91 GNUNET_break (ntohs (msg->type) ==
92 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
93 size = ntohs (msg->size);
94 if (size == sizeof (struct GNUNET_MessageHeader))
97 alucb->cb (alucb->cb_cls, NULL );
98 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
102 address = (const struct GNUNET_HELLO_Address *) &msg[1];
104 if (address[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
108 alucb->cb (alucb->cb_cls, NULL );
109 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
114 /* expect more replies */
115 GNUNET_CLIENT_receive (alucb->client, &peer_address_response_processor, alucb,
116 GNUNET_TIME_absolute_get_remaining (alucb->timeout));
118 /* REFACTOR FIX THIS */
119 alucb->cb (alucb->cb_cls, address );
124 * Return all the known addresses for a peer.
126 * @param cfg configuration to use
127 * @param peer peer identity to look up the addresses of
128 * @param timeout how long is the lookup allowed to take at most
129 * @param peer_address_callback function to call with the results
130 * @param peer_address_callback_cls closure for peer_address_callback
131 * @return handle to cancel the operation, NULL on error
133 struct GNUNET_TRANSPORT_PeerAddressLookupContext *
134 GNUNET_TRANSPORT_peer_get_active_addresses (const struct GNUNET_CONFIGURATION_Handle *cfg,
135 const struct GNUNET_PeerIdentity *peer,
137 struct GNUNET_TIME_Relative timeout,
138 GNUNET_TRANSPORT_AddressLookUpCallback peer_address_callback,
139 void *peer_address_callback_cls)
141 struct PeerAddressLookupMessage msg;
142 struct GNUNET_TRANSPORT_PeerAddressLookupContext *alc;
143 struct GNUNET_CLIENT_Connection *client;
145 client = GNUNET_CLIENT_connect ("transport", cfg);
148 msg.header.size = htons (sizeof (struct PeerAddressLookupMessage));
149 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PEER_ADDRESS_LOOKUP);
150 msg.reserved = htonl (0);
151 msg.timeout = GNUNET_TIME_relative_hton (timeout);
152 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
153 alc = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PeerAddressLookupContext));
154 alc->cb = peer_address_callback;
155 alc->cb_cls = peer_address_callback_cls;
156 alc->timeout = GNUNET_TIME_relative_to_absolute (timeout);
157 alc->client = client;
158 GNUNET_assert (GNUNET_OK ==
159 GNUNET_CLIENT_transmit_and_get_response (client, &msg.header,
161 &peer_address_response_processor,
168 * Cancel request for address conversion.
170 * @param alc handle for the request to cancel
173 GNUNET_TRANSPORT_peer_get_active_addresses_cancel (struct
174 GNUNET_TRANSPORT_PeerAddressLookupContext
177 GNUNET_CLIENT_disconnect (alc->client, GNUNET_NO);
182 * Function called with responses from the service.
184 * @param cls our 'struct AddressLookupCtx*'
185 * @param msg NULL on timeout or error, otherwise presumably a
186 * message with the human-readable peer and address
189 peer_address_iteration_response_processor (void *cls,
190 const struct GNUNET_MessageHeader *msg)
192 struct GNUNET_TRANSPORT_PeerAddressLookupContext *alucb = cls;
193 struct AddressIterateResponseMessage *arm;
194 struct GNUNET_HELLO_Address * address;
199 alucb->cb (alucb->cb_cls, NULL);
200 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
205 GNUNET_break (ntohs (msg->type) ==
206 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
207 size = ntohs (msg->size);
208 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received message type %u size %u\n",
209 ntohs (msg->type), size);
210 if (size == sizeof (struct GNUNET_MessageHeader))
213 alucb->cb (alucb->cb_cls, NULL);
214 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
218 if (size < sizeof (struct AddressIterateResponseMessage))
222 alucb->cb (alucb->cb_cls, NULL);
223 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
228 arm = (struct AddressIterateResponseMessage *) &msg[1];
229 address = (struct GNUNET_HELLO_Address *) &arm[1];
231 /* expect more replies */
232 GNUNET_CLIENT_receive (alucb->client, &peer_address_response_processor, alucb,
233 GNUNET_TIME_absolute_get_remaining (alucb->timeout));
234 alucb->cb (alucb->cb_cls, address);
239 * Return all the known addresses for a peer.
241 * @param cfg configuration to use
242 * @param timeout how long is the lookup allowed to take at most
243 * @param peer_address_callback function to call with the results
244 * @param peer_address_callback_cls closure for peer_address_callback
247 GNUNET_TRANSPORT_address_iterate (const struct GNUNET_CONFIGURATION_Handle *cfg,
248 struct GNUNET_TIME_Relative timeout,
249 GNUNET_TRANSPORT_AddressLookUpCallback
250 peer_address_callback,
251 void *peer_address_callback_cls)
253 struct AddressIterateMessage msg;
254 struct GNUNET_TIME_Absolute abs_timeout;
255 struct GNUNET_TRANSPORT_PeerAddressLookupContext *peer_address_lookup_cb;
256 struct GNUNET_CLIENT_Connection *client;
258 client = GNUNET_CLIENT_connect ("transport", cfg);
261 peer_address_callback (peer_address_callback_cls, NULL);
264 abs_timeout = GNUNET_TIME_relative_to_absolute (timeout);
266 msg.header.size = htons (sizeof (struct AddressIterateMessage));
267 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_ITERATE);
268 msg.timeout = GNUNET_TIME_absolute_hton (abs_timeout);
269 peer_address_lookup_cb = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PeerAddressLookupContext));
270 peer_address_lookup_cb->cb = peer_address_callback;
271 peer_address_lookup_cb->cb_cls = peer_address_callback_cls;
272 peer_address_lookup_cb->timeout = abs_timeout;
273 peer_address_lookup_cb->client = client;
274 GNUNET_assert (GNUNET_OK ==
275 GNUNET_CLIENT_transmit_and_get_response (client, &msg.header,
277 &peer_address_iteration_response_processor,
278 peer_address_lookup_cb));
281 /* end of transport_api_peer_address_lookup.c */