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3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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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, const struct GNUNET_MessageHeader *msg)
71 struct GNUNET_CORE_RequestContext *request_context = cls;
72 const struct ConnectNotifyMessage *connect_message;
76 /* Handle last message or error case, disconnect and clean up */
78 ((ntohs (msg->type) == GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END) &&
79 (ntohs (msg->size) == sizeof (struct GNUNET_MessageHeader))))
81 if (request_context->peer_cb != NULL)
82 request_context->peer_cb (request_context->cb_cls, NULL, NULL);
83 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
84 GNUNET_free (request_context);
88 msize = ntohs (msg->size);
89 /* Handle incorrect message type or size, disconnect and clean up */
90 if ((ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT) ||
91 (msize < sizeof (struct ConnectNotifyMessage)))
94 if (request_context->peer_cb != NULL)
95 request_context->peer_cb (request_context->cb_cls, NULL, NULL);
96 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
97 GNUNET_free (request_context);
100 connect_message = (const struct ConnectNotifyMessage *) msg;
101 ats_count = ntohl (connect_message->ats_count);
103 sizeof (struct ConnectNotifyMessage) +
104 ats_count * sizeof (struct GNUNET_ATS_Information)) ||
105 (GNUNET_ATS_ARRAY_TERMINATOR !=
106 ntohl ((&connect_message->ats)[ats_count].type)))
109 if (request_context->peer_cb != NULL)
110 request_context->peer_cb (request_context->cb_cls, NULL, NULL);
111 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
112 GNUNET_free (request_context);
116 if (request_context->peer_cb != NULL)
117 request_context->peer_cb (request_context->cb_cls, &connect_message->peer,
118 &connect_message->ats);
119 GNUNET_CLIENT_receive (request_context->client, &receive_info,
120 request_context, GNUNET_TIME_UNIT_FOREVER_REL);
124 * Function called to notify a client about the socket
125 * begin ready to queue more data. "buf" will be
126 * NULL and "size" zero if the socket was closed for
127 * writing in the meantime.
130 * @param size number of bytes available in buf
131 * @param buf where the callee should write the message
132 * @return number of bytes written to buf
135 transmit_request (void *cls, size_t size, void *buf)
137 struct GNUNET_MessageHeader *msg;
138 struct GNUNET_PeerIdentity *peer = cls;
142 msize = sizeof (struct GNUNET_MessageHeader);
145 sizeof (struct GNUNET_MessageHeader) +
146 sizeof (struct GNUNET_PeerIdentity);
148 if ((size < msize) || (buf == NULL))
151 msg = (struct GNUNET_MessageHeader *) buf;
152 msg->size = htons (msize);
155 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED);
156 memcpy (&msg[1], peer, sizeof (struct GNUNET_PeerIdentity));
159 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS);
165 * Iterate over all currently connected peers.
166 * Calls peer_cb with each connected peer, and then
167 * once with NULL to indicate that all peers have
170 * @param cfg configuration to use
171 * @param peer the specific peer to check for
172 * @param peer_cb function to call with the peer information
173 * @param cb_cls closure for peer_cb
175 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
178 GNUNET_CORE_is_peer_connected (const struct GNUNET_CONFIGURATION_Handle *cfg,
179 struct GNUNET_PeerIdentity *peer,
180 GNUNET_CORE_ConnectEventHandler peer_cb,
183 struct GNUNET_CORE_RequestContext *request_context;
184 struct GNUNET_CLIENT_Connection *client;
186 client = GNUNET_CLIENT_connect ("core", cfg);
188 return GNUNET_SYSERR;
189 GNUNET_assert (peer != NULL);
190 request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
191 request_context->client = client;
192 request_context->peer_cb = peer_cb;
193 request_context->cb_cls = cb_cls;
194 request_context->peer = peer;
196 request_context->th =
197 GNUNET_CLIENT_notify_transmit_ready (client,
198 sizeof (struct GNUNET_MessageHeader)
200 sizeof (struct GNUNET_PeerIdentity),
201 GNUNET_TIME_relative_get_forever (),
202 GNUNET_YES, &transmit_request, peer);
203 GNUNET_assert (request_context->th != NULL);
204 GNUNET_CLIENT_receive (client, &receive_info, request_context,
205 GNUNET_TIME_relative_get_forever ());
210 * Iterate over all currently connected peers.
211 * Calls peer_cb with each connected peer, and then
212 * once with NULL to indicate that all peers have
215 * @param cfg configuration to use
216 * @param peer_cb function to call with the peer information
217 * @param cb_cls closure for peer_cb
219 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
222 GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
223 GNUNET_CORE_ConnectEventHandler peer_cb,
226 struct GNUNET_CORE_RequestContext *request_context;
227 struct GNUNET_CLIENT_Connection *client;
229 client = GNUNET_CLIENT_connect ("core", cfg);
231 return GNUNET_SYSERR;
232 request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
233 request_context->client = client;
234 request_context->peer_cb = peer_cb;
235 request_context->cb_cls = cb_cls;
237 request_context->th =
238 GNUNET_CLIENT_notify_transmit_ready (client,
239 sizeof (struct GNUNET_MessageHeader),
240 GNUNET_TIME_relative_get_forever (),
241 GNUNET_YES, &transmit_request, NULL);
243 GNUNET_CLIENT_receive (client, &receive_info, request_context,
244 GNUNET_TIME_relative_get_forever ());
248 /* end of core_api_iterate_peers.c */