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 AddressLookupCtx
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 AddressLookupCtx*'
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 AddressLookupCtx *alucb = cls;
86 alucb->cb (alucb->cb_cls, NULL);
87 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
91 GNUNET_break (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
92 size = ntohs (msg->size);
93 if (size == sizeof (struct GNUNET_MessageHeader))
96 alucb->cb (alucb->cb_cls, NULL);
97 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
101 address = (const char *) &msg[1];
102 if (address[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
106 alucb->cb (alucb->cb_cls, NULL);
107 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
111 /* expect more replies */
112 GNUNET_CLIENT_receive (alucb->client,
113 &peer_address_response_processor, alucb,
114 GNUNET_TIME_absolute_get_remaining
116 alucb->cb (alucb->cb_cls, address);
121 * Return all the known addresses for a peer.
123 * @param cfg configuration to use
124 * @param peer peer identity to look up the addresses of
125 * @param timeout how long is the lookup allowed to take at most
126 * @param peer_address_callback function to call with the results
127 * @param peer_address_callback_cls closure for peer_address_callback
130 GNUNET_TRANSPORT_peer_address_lookup (const struct GNUNET_CONFIGURATION_Handle *cfg,
131 const struct GNUNET_PeerIdentity *peer,
132 struct GNUNET_TIME_Relative timeout,
133 GNUNET_TRANSPORT_AddressLookUpCallback peer_address_callback,
134 void *peer_address_callback_cls)
136 struct PeerAddressLookupMessage msg;
137 struct GNUNET_TIME_Absolute abs_timeout;
138 struct AddressLookupCtx *peer_address_lookup_cb;
139 struct GNUNET_CLIENT_Connection *client;
141 client = GNUNET_CLIENT_connect ("transport", cfg);
144 peer_address_callback (peer_address_callback_cls, NULL);
147 abs_timeout = GNUNET_TIME_relative_to_absolute (timeout);
149 msg.header.size = htons (sizeof(struct PeerAddressLookupMessage));
150 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PEER_ADDRESS_LOOKUP);
151 msg.timeout = GNUNET_TIME_absolute_hton (abs_timeout);
152 memcpy(&msg.peer, peer, sizeof(struct GNUNET_PeerIdentity));
153 peer_address_lookup_cb = GNUNET_malloc (sizeof (struct AddressLookupCtx));
154 peer_address_lookup_cb->cb = peer_address_callback;
155 peer_address_lookup_cb->cb_cls = peer_address_callback_cls;
156 peer_address_lookup_cb->timeout = abs_timeout;
157 peer_address_lookup_cb->client = client;
158 GNUNET_assert (GNUNET_OK ==
159 GNUNET_CLIENT_transmit_and_get_response (client,
163 &peer_address_response_processor,
164 peer_address_lookup_cb));
167 /* end of transport_api_peer_address_lookup.c */