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;
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 char *) &msg[1];
103 if (address[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
107 alucb->cb (alucb->cb_cls, NULL);
108 GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
112 /* expect more replies */
113 GNUNET_CLIENT_receive (alucb->client, &peer_address_response_processor, alucb,
114 GNUNET_TIME_absolute_get_remaining (alucb->timeout));
115 alucb->cb (alucb->cb_cls, address);
120 * Return all the known addresses for a peer.
122 * @param cfg configuration to use
123 * @param peer peer identity to look up the addresses of
124 * @param timeout how long is the lookup allowed to take at most
125 * @param peer_address_callback function to call with the results
126 * @param peer_address_callback_cls closure for peer_address_callback
127 * @return handle to cancel the operation, NULL on error
129 struct GNUNET_TRANSPORT_PeerAddressLookupContext *
130 GNUNET_TRANSPORT_peer_address_lookup (const struct GNUNET_CONFIGURATION_Handle
132 const struct GNUNET_PeerIdentity *peer,
133 struct GNUNET_TIME_Relative timeout,
134 GNUNET_TRANSPORT_AddressLookUpCallback
135 peer_address_callback,
136 void *peer_address_callback_cls)
138 struct PeerAddressLookupMessage msg;
139 struct GNUNET_TRANSPORT_PeerAddressLookupContext *alc;
140 struct GNUNET_CLIENT_Connection *client;
142 client = GNUNET_CLIENT_connect ("transport", cfg);
145 msg.header.size = htons (sizeof (struct PeerAddressLookupMessage));
146 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PEER_ADDRESS_LOOKUP);
147 msg.timeout = GNUNET_TIME_relative_hton (timeout);
148 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
150 GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PeerAddressLookupContext));
151 alc->cb = peer_address_callback;
152 alc->cb_cls = peer_address_callback_cls;
153 alc->timeout = GNUNET_TIME_relative_to_absolute (timeout);
154 alc->client = client;
155 GNUNET_assert (GNUNET_OK ==
156 GNUNET_CLIENT_transmit_and_get_response (client, &msg.header,
158 &peer_address_response_processor,
165 * Cancel request for address conversion.
167 * @param alc handle for the request to cancel
170 GNUNET_TRANSPORT_peer_address_lookup_cancel (struct
171 GNUNET_TRANSPORT_PeerAddressLookupContext
174 GNUNET_CLIENT_disconnect (alc->client, GNUNET_NO);
179 /* end of transport_api_peer_address_lookup.c */