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-rw-r--r--src/core/core_api_iterate_peers.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/src/core/core_api_iterate_peers.c b/src/core/core_api_iterate_peers.c
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+++ b/src/core/core_api_iterate_peers.c
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+/*
+ This file is part of GNUnet.
+ (C) 2009, 2010 Christian Grothoff (and other contributing authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file core/core_api_iterate_peers.c
+ * @brief implementation of the peer_iterate function
+ * @author Christian Grothoff
+ * @author Nathan Evans
+ */
+#include "platform.h"
+#include "gnunet_core_service.h"
+#include "core.h"
+
+
+struct GNUNET_CORE_RequestContext
+{
+ /**
+ * Our connection to the service.
+ */
+ struct GNUNET_CLIENT_Connection *client;
+
+ /**
+ * Handle for transmitting a request.
+ */
+ struct GNUNET_CLIENT_TransmitHandle *th;
+
+ /**
+ * Function called with the peer.
+ */
+ GNUNET_CORE_ConnectEventHandler peer_cb;
+
+ /**
+ * Peer to check for.
+ */
+ struct GNUNET_PeerIdentity *peer;
+
+ /**
+ * Closure for peer_cb.
+ */
+ void *cb_cls;
+
+};
+
+
+/**
+ * Receive reply from core service with information about a peer.
+ *
+ * @param cls our 'struct GNUNET_CORE_RequestContext *'
+ * @param msg NULL on error or last entry
+ */
+static void
+receive_info (void *cls, const struct GNUNET_MessageHeader *msg)
+{
+ struct GNUNET_CORE_RequestContext *request_context = cls;
+ const struct ConnectNotifyMessage *connect_message;
+ uint32_t ats_count;
+ uint16_t msize;
+
+ /* Handle last message or error case, disconnect and clean up */
+ if ((msg == NULL) ||
+ ((ntohs (msg->type) == GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END) &&
+ (ntohs (msg->size) == sizeof (struct GNUNET_MessageHeader))))
+ {
+ if (request_context->peer_cb != NULL)
+ request_context->peer_cb (request_context->cb_cls, NULL, NULL, 0);
+ GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
+ GNUNET_free (request_context);
+ return;
+ }
+
+ msize = ntohs (msg->size);
+ /* Handle incorrect message type or size, disconnect and clean up */
+ if ((ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT) ||
+ (msize < sizeof (struct ConnectNotifyMessage)))
+ {
+ GNUNET_break (0);
+ if (request_context->peer_cb != NULL)
+ request_context->peer_cb (request_context->cb_cls, NULL, NULL, 0);
+ GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
+ GNUNET_free (request_context);
+ return;
+ }
+ connect_message = (const struct ConnectNotifyMessage *) msg;
+ ats_count = ntohl (connect_message->ats_count);
+ if (msize !=
+ sizeof (struct ConnectNotifyMessage) +
+ ats_count * sizeof (struct GNUNET_ATS_Information))
+ {
+ GNUNET_break (0);
+ if (request_context->peer_cb != NULL)
+ request_context->peer_cb (request_context->cb_cls, NULL, NULL, 0);
+ GNUNET_CLIENT_disconnect (request_context->client, GNUNET_NO);
+ GNUNET_free (request_context);
+ return;
+ }
+ /* Normal case */
+ if (request_context->peer_cb != NULL)
+ request_context->peer_cb (request_context->cb_cls, &connect_message->peer,
+ (const struct GNUNET_ATS_Information *)
+ &connect_message[1], ats_count);
+ GNUNET_CLIENT_receive (request_context->client, &receive_info,
+ request_context, GNUNET_TIME_UNIT_FOREVER_REL);
+}
+
+/**
+ * Function called to notify a client about the socket
+ * begin ready to queue more data. "buf" will be
+ * NULL and "size" zero if the socket was closed for
+ * writing in the meantime.
+ *
+ * @param cls closure
+ * @param size number of bytes available in buf
+ * @param buf where the callee should write the message
+ * @return number of bytes written to buf
+ */
+static size_t
+transmit_request (void *cls, size_t size, void *buf)
+{
+ struct GNUNET_MessageHeader *msg;
+ struct GNUNET_PeerIdentity *peer = cls;
+ int msize;
+
+ if (peer == NULL)
+ msize = sizeof (struct GNUNET_MessageHeader);
+ else
+ msize =
+ sizeof (struct GNUNET_MessageHeader) +
+ sizeof (struct GNUNET_PeerIdentity);
+
+ if ((size < msize) || (buf == NULL))
+ return 0;
+
+ msg = (struct GNUNET_MessageHeader *) buf;
+ msg->size = htons (msize);
+ if (peer != NULL)
+ {
+ msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED);
+ memcpy (&msg[1], peer, sizeof (struct GNUNET_PeerIdentity));
+ }
+ else
+ msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS);
+
+ return msize;
+}
+
+/**
+ * Iterate over all currently connected peers.
+ * Calls peer_cb with each connected peer, and then
+ * once with NULL to indicate that all peers have
+ * been handled.
+ *
+ * @param cfg configuration to use
+ * @param peer the specific peer to check for
+ * @param peer_cb function to call with the peer information
+ * @param cb_cls closure for peer_cb
+ *
+ * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
+ */
+int
+GNUNET_CORE_is_peer_connected (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ struct GNUNET_PeerIdentity *peer,
+ GNUNET_CORE_ConnectEventHandler peer_cb,
+ void *cb_cls)
+{
+ struct GNUNET_CORE_RequestContext *request_context;
+ struct GNUNET_CLIENT_Connection *client;
+
+ client = GNUNET_CLIENT_connect ("core", cfg);
+ if (client == NULL)
+ return GNUNET_SYSERR;
+ GNUNET_assert (peer != NULL);
+ request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
+ request_context->client = client;
+ request_context->peer_cb = peer_cb;
+ request_context->cb_cls = cb_cls;
+ request_context->peer = peer;
+
+ request_context->th =
+ GNUNET_CLIENT_notify_transmit_ready (client,
+ sizeof (struct GNUNET_MessageHeader)
+ +
+ sizeof (struct GNUNET_PeerIdentity),
+ GNUNET_TIME_relative_get_forever (),
+ GNUNET_YES, &transmit_request, peer);
+ GNUNET_assert (request_context->th != NULL);
+ GNUNET_CLIENT_receive (client, &receive_info, request_context,
+ GNUNET_TIME_relative_get_forever ());
+ return GNUNET_OK;
+}
+
+/**
+ * Iterate over all currently connected peers.
+ * Calls peer_cb with each connected peer, and then
+ * once with NULL to indicate that all peers have
+ * been handled.
+ *
+ * @param cfg configuration to use
+ * @param peer_cb function to call with the peer information
+ * @param cb_cls closure for peer_cb
+ *
+ * @return GNUNET_OK if iterating, GNUNET_SYSERR on error
+ */
+int
+GNUNET_CORE_iterate_peers (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ GNUNET_CORE_ConnectEventHandler peer_cb,
+ void *cb_cls)
+{
+ struct GNUNET_CORE_RequestContext *request_context;
+ struct GNUNET_CLIENT_Connection *client;
+
+ client = GNUNET_CLIENT_connect ("core", cfg);
+ if (client == NULL)
+ return GNUNET_SYSERR;
+ request_context = GNUNET_malloc (sizeof (struct GNUNET_CORE_RequestContext));
+ request_context->client = client;
+ request_context->peer_cb = peer_cb;
+ request_context->cb_cls = cb_cls;
+
+ request_context->th =
+ GNUNET_CLIENT_notify_transmit_ready (client,
+ sizeof (struct GNUNET_MessageHeader),
+ GNUNET_TIME_relative_get_forever (),
+ GNUNET_YES, &transmit_request, NULL);
+
+ GNUNET_CLIENT_receive (client, &receive_info, request_context,
+ GNUNET_TIME_relative_get_forever ());
+ return GNUNET_OK;
+}
+
+/* end of core_api_iterate_peers.c */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-21 14:18:36 +0000