2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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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.
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22 * @file core/core_api_iterate_peers.c
23 * @brief implementation of the peer_iterate function
24 * @author Christian Grothoff
25 * @author Nathan Evans
28 #include "gnunet_core_service.h"
32 struct GNUNET_CORE_RequestContext
35 * Our connection to the service.
37 struct GNUNET_CLIENT_Connection *client;
40 * Handle for transmitting a request.
42 struct GNUNET_CLIENT_TransmitHandle *th;
45 * Function called with the peer.
47 GNUNET_CORE_ConnectEventHandler peer_cb;
52 struct GNUNET_PeerIdentity *peer;
55 * Closure for peer_cb.
63 * Receive reply from core service with information about a peer.
65 * @param cls our 'struct GNUNET_CORE_RequestContext *'
66 * @param msg NULL on error or last entry
69 receive_info (void *cls,
70 const struct GNUNET_MessageHeader *msg)
72 struct GNUNET_CORE_RequestContext *request_context = cls;
73 const struct ConnectNotifyMessage *connect_message;
77 /* Handle last message or error case, disconnect and clean up */
79 ((ntohs (msg->type) == GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END) &&
80 (ntohs (msg->size) == sizeof (struct GNUNET_MessageHeader))) )
82 if (request_context->peer_cb != NULL)
83 request_context->peer_cb (request_context->cb_cls,
85 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
86 GNUNET_free (request_context);
90 msize = ntohs (msg->size);
91 /* Handle incorrect message type or size, disconnect and clean up */
92 if ( (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT) ||
93 (msize < sizeof (struct ConnectNotifyMessage)) )
96 if (request_context->peer_cb != NULL)
97 request_context->peer_cb (request_context->cb_cls,
99 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
100 GNUNET_free (request_context);
103 connect_message = (const struct ConnectNotifyMessage *) msg;
104 ats_count = ntohl (connect_message->ats_count);
105 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
106 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&connect_message->ats)[ats_count].type)) )
109 if (request_context->peer_cb != NULL)
110 request_context->peer_cb (request_context->cb_cls,
112 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
113 GNUNET_free (request_context);
117 if (request_context->peer_cb != NULL)
118 request_context->peer_cb (request_context->cb_cls,
119 &connect_message->peer,
120 &connect_message->ats);
121 GNUNET_CLIENT_receive(request_context->client,
124 GNUNET_TIME_UNIT_FOREVER_REL);
128 * Function called to notify a client about the socket
129 * begin ready to queue more data. "buf" will be
130 * NULL and "size" zero if the socket was closed for
131 * writing in the meantime.
134 * @param size number of bytes available in buf
135 * @param buf where the callee should write the message
136 * @return number of bytes written to buf
139 transmit_request(void *cls,
140 size_t size, void *buf)
142 struct GNUNET_MessageHeader *msg;
143 struct GNUNET_PeerIdentity *peer = cls;
147 msize = sizeof(struct GNUNET_MessageHeader);
149 msize = sizeof(struct GNUNET_MessageHeader) + sizeof(struct GNUNET_PeerIdentity);
151 if ((size < msize) || (buf == NULL))
154 msg = (struct GNUNET_MessageHeader *)buf;
155 msg->size = htons (msize);
158 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED);
159 memcpy(&msg[1], peer, sizeof(struct GNUNET_PeerIdentity));
162 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS);
168 * Iterate over all currently connected peers.
169 * Calls peer_cb with each connected peer, and then
170 * once with NULL to indicate that all peers have
173 * @param cfg configuration to use
174 * @param peer the specific peer to check for
175 * @param peer_cb function to call with the peer information
176 * @param cb_cls closure for peer_cb
178 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
181 GNUNET_CORE_is_peer_connected (const struct GNUNET_CONFIGURATION_Handle *cfg,
182 struct GNUNET_PeerIdentity *peer,
183 GNUNET_CORE_ConnectEventHandler peer_cb,
186 struct GNUNET_CORE_RequestContext *request_context;
187 struct GNUNET_CLIENT_Connection *client;
189 client = GNUNET_CLIENT_connect ("core", cfg);
191 return GNUNET_SYSERR;
192 GNUNET_assert(peer != NULL);
193 request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
194 request_context->client = client;
195 request_context->peer_cb = peer_cb;
196 request_context->cb_cls = cb_cls;
197 request_context->peer = peer;
199 request_context->th = GNUNET_CLIENT_notify_transmit_ready(client,
200 sizeof(struct GNUNET_MessageHeader) + sizeof(struct GNUNET_PeerIdentity),
201 GNUNET_TIME_relative_get_forever(),
205 GNUNET_assert(request_context->th != NULL);
206 GNUNET_CLIENT_receive(client, &receive_info, request_context, GNUNET_TIME_relative_get_forever());
211 * Iterate over all currently connected peers.
212 * Calls peer_cb with each connected peer, and then
213 * once with NULL to indicate that all peers have
216 * @param cfg configuration to use
217 * @param peer_cb function to call with the peer information
218 * @param cb_cls closure for peer_cb
220 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
223 GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
224 GNUNET_CORE_ConnectEventHandler peer_cb,
227 struct GNUNET_CORE_RequestContext *request_context;
228 struct GNUNET_CLIENT_Connection *client;
230 client = GNUNET_CLIENT_connect ("core", cfg);
232 return GNUNET_SYSERR;
233 request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
234 request_context->client = client;
235 request_context->peer_cb = peer_cb;
236 request_context->cb_cls = cb_cls;
238 request_context->th = GNUNET_CLIENT_notify_transmit_ready(client,
239 sizeof(struct GNUNET_MessageHeader),
240 GNUNET_TIME_relative_get_forever(),
245 GNUNET_CLIENT_receive(client, &receive_info, request_context, GNUNET_TIME_relative_get_forever());
249 /* end of core_api_iterate_peers.c */