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-rw-r--r--src/core/core_api_is_connected.c232
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diff --git a/src/core/core_api_is_connected.c b/src/core/core_api_is_connected.c
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+++ b/src/core/core_api_is_connected.c
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+/*
+ This file is part of GNUnet.
+ (C) 2009, 2010, 2012 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_is_connected.c
+ * @brief implementation of the 'GNUNET_CORE_is_peer_connected function
+ * @author Christian Grothoff
+ * @author Nathan Evans
+ *
+ * TODO:
+ * - define nice structs for the IPC messages in core.h
+ * - consider NOT always sending the 'END' message -- it is redundant!
+ */
+#include "platform.h"
+#include "gnunet_core_service.h"
+#include "core.h"
+
+
+/**
+ * Closure for 'transmit_is_connected_request"
+ */
+struct GNUNET_CORE_ConnectTestHandle
+{
+
+ /**
+ * 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_connect_info (void *cls, const struct GNUNET_MessageHeader *msg)
+{
+ struct GNUNET_CORE_ConnectTestHandle *cth = cls;
+ const struct ConnectNotifyMessage *connect_message;
+ uint32_t ats_count;
+ uint16_t msize;
+
+ if (NULL == msg)
+ {
+ /* core died, failure */
+ cth->peer_cb (cth->cb_cls, NULL, NULL, 0);
+ GNUNET_CORE_is_peer_connected_cancel (cth);
+ return;
+ }
+ if ((ntohs (msg->type) == GNUNET_MESSAGE_TYPE_CORE_ITERATE_PEERS_END) &&
+ (ntohs (msg->size) == sizeof (struct GNUNET_MessageHeader)))
+ {
+ /* end of transmissions */
+ cth->peer_cb (cth->cb_cls, NULL, NULL, 0);
+ GNUNET_CORE_is_peer_connected_cancel (cth);
+ 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);
+ cth->peer_cb (cth->cb_cls, NULL, NULL, 0);
+ GNUNET_CORE_is_peer_connected_cancel (cth);
+ 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);
+ cth->peer_cb (cth->cb_cls, NULL, NULL, 0);
+ GNUNET_CORE_is_peer_connected_cancel (cth);
+ return;
+ }
+ /* Normal case */
+ cth->peer_cb (cth->cb_cls, &connect_message->peer,
+ (const struct GNUNET_ATS_Information *)
+ &connect_message[1], ats_count);
+ GNUNET_CLIENT_receive (cth->client, &receive_connect_info,
+ cth, 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_is_connected_request (void *cls, size_t size, void *buf)
+{
+ struct GNUNET_CORE_ConnectTestHandle *cth = cls;
+ struct GNUNET_MessageHeader *msg;
+ unsigned int msize;
+
+ cth->th = NULL;
+ msize =
+ sizeof (struct GNUNET_MessageHeader) +
+ sizeof (struct GNUNET_PeerIdentity);
+ if ( (NULL == buf) || (0 == size) )
+ {
+ cth->peer_cb (cth->cb_cls,
+ NULL,
+ NULL, 0);
+ GNUNET_CLIENT_disconnect (cth->client);
+ GNUNET_free (cth);
+ return 0;
+ }
+ GNUNET_assert (size >= msize);
+ msg = (struct GNUNET_MessageHeader *) buf;
+ msg->size = htons (msize);
+ msg->type = htons (GNUNET_MESSAGE_TYPE_CORE_PEER_CONNECTED);
+ memcpy (&msg[1], &cth->peer, sizeof (struct GNUNET_PeerIdentity));
+ GNUNET_CLIENT_receive (cth->client, &receive_connect_info, cth,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ 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
+ */
+struct GNUNET_CORE_ConnectTestHandle *
+GNUNET_CORE_is_peer_connected (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ const struct GNUNET_PeerIdentity *peer,
+ GNUNET_CORE_ConnectEventHandler peer_cb,
+ void *cb_cls)
+{
+ struct GNUNET_CORE_ConnectTestHandle *cth;
+ struct GNUNET_CLIENT_Connection *client;
+
+ GNUNET_assert (NULL != peer);
+ GNUNET_assert (NULL != peer_cb);
+ client = GNUNET_CLIENT_connect ("core", cfg);
+ if (NULL == client)
+ return NULL;
+ cth = GNUNET_malloc (sizeof (struct GNUNET_CORE_ConnectTestHandle));
+ cth->peer = *peer;
+ cth->client = client;
+ cth->peer_cb = peer_cb;
+ cth->cb_cls = cb_cls;
+ cth->th =
+ GNUNET_CLIENT_notify_transmit_ready (client,
+ sizeof (struct GNUNET_MessageHeader) +
+ sizeof (struct GNUNET_PeerIdentity),
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ GNUNET_YES, &transmit_is_connected_request, cth);
+ GNUNET_assert (NULL != cth->th);
+ return cth;
+}
+
+
+/**
+ * Abort 'is_connected' test operation.
+ *
+ * @param cth handle for operation to cancel
+ */
+void
+GNUNET_CORE_is_peer_connected_cancel (struct GNUNET_CORE_ConnectTestHandle *cth)
+{
+ if (NULL != cth->th)
+ {
+ GNUNET_CLIENT_notify_transmit_ready_cancel (cth->th);
+ cth->th = NULL;
+ }
+ GNUNET_CLIENT_disconnect (cth->client);
+ GNUNET_free (cth);
+}
+
+
+/* end of core_api_is_connected.c */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-21 15:38:19 +0000