Imported Upstream version 0.9.3upstream/0.9.3

1 files changed, 232 insertions, 0 deletions

diff --git a/src/core/core_api_is_connected.c b/src/core/core_api_is_connected.c
new file mode 100644
index 0000000..2e01b36
--- /dev/null
+++ b/src/core/core_api_is_connected.c
@@ -0,0 +1,232 @@
+/*
+     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 */