2 This file is part of GNUnet.
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
36 * Our connection to the service.
38 struct GNUNET_CLIENT_Connection *client;
41 * Handle for transmitting a request.
43 struct GNUNET_CLIENT_TransmitHandle *th;
46 * Function called with the peer.
48 GNUNET_CORE_ConnectEventHandler peer_cb;
51 * Closure for peer_cb.
59 * Receive reply from core service with information about a peer.
61 * @param cls our 'struct GNUNET_CORE_RequestContext *'
62 * @param msg NULL on error or last entry
65 receive_info (void *cls,
66 const struct GNUNET_MessageHeader *msg)
68 struct GNUNET_CORE_RequestContext *request_context = cls;
69 const struct ConnectNotifyMessage *connect_message;
73 /* Handle last message or error case, disconnect and clean up */
74 msize = ntohs (msg->size);
76 ((ntohs (msg->type) == GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END) &&
77 (msize == sizeof (struct GNUNET_MessageHeader))) )
79 if (request_context->peer_cb != NULL)
80 request_context->peer_cb (request_context->cb_cls,
82 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
83 GNUNET_free (request_context);
87 /* Handle incorrect message type or size, disconnect and clean up */
88 if ( (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT) ||
89 (msize < sizeof (struct ConnectNotifyMessage)) )
92 if (request_context->peer_cb != NULL)
93 request_context->peer_cb (request_context->cb_cls,
95 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
96 GNUNET_free (request_context);
99 connect_message = (const struct ConnectNotifyMessage *) msg;
100 ats_count = ntohl (connect_message->ats_count);
101 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
102 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&connect_message->ats)[ats_count].type)) )
105 if (request_context->peer_cb != NULL)
106 request_context->peer_cb (request_context->cb_cls,
108 GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
109 GNUNET_free (request_context);
113 if (request_context->peer_cb != NULL)
114 request_context->peer_cb (request_context->cb_cls,
115 &connect_message->peer,
116 &connect_message->ats);
117 GNUNET_CLIENT_receive(request_context->client,
120 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,
136 size_t size, void *buf)
138 struct GNUNET_MessageHeader *msg;
139 if ((size < sizeof(struct GNUNET_MessageHeader)) || (buf == NULL))
142 msg = (struct GNUNET_MessageHeader *)buf;
143 msg->size = htons (sizeof (struct GNUNET_MessageHeader));
144 msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS);
145 return sizeof(struct GNUNET_MessageHeader);
149 * Obtain statistics and/or change preferences for the given peer.
151 * @param sched scheduler to use
152 * @param cfg configuration to use
153 * @param peer_cb function to call with the peer information
154 * @param cb_cls closure for peer_cb
155 * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
158 GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
159 GNUNET_CORE_ConnectEventHandler peer_cb,
162 struct GNUNET_CORE_RequestContext *request_context;
163 struct GNUNET_CLIENT_Connection *client;
165 client = GNUNET_CLIENT_connect ("core", cfg);
167 return GNUNET_SYSERR;
168 request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
169 request_context->client = client;
170 request_context->peer_cb = peer_cb;
171 request_context->cb_cls = cb_cls;
173 request_context->th = GNUNET_CLIENT_notify_transmit_ready(client,
174 sizeof(struct GNUNET_MessageHeader),
175 GNUNET_TIME_relative_get_forever(),
180 GNUNET_CLIENT_receive(client, &receive_info, request_context, GNUNET_TIME_relative_get_forever());
184 /* end of core_api_iterate_peers.c */