[GNUnet-SVN] r15902 - gnunet/src/transport

[gnunet]

Author: nevans
Date: 2011-07-08 18:47:58 +0200 (Fri, 08 Jul 2011)
New Revision: 15902

Added:
   gnunet/src/transport/transport_api_peer_address_lookup.c
Log:
api call for connected peer lookup by peer id

Added: gnunet/src/transport/transport_api_peer_address_lookup.c
===================================================================
--- gnunet/src/transport/transport_api_peer_address_lookup.c                    
        (rev 0)
+++ gnunet/src/transport/transport_api_peer_address_lookup.c    2011-07-08 
16:47:58 UTC (rev 15902)
@@ -0,0 +1,155 @@
+/*
+     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.
+*/
+#include "platform.h"
+#include "gnunet_client_lib.h"
+#include "gnunet_arm_service.h"
+#include "gnunet_hello_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_server_lib.h"
+#include "gnunet_time_lib.h"
+#include "gnunet_transport_service.h"
+#include "transport.h"
+
+/**
+ * Context for the address lookup.
+ */
+struct AddressLookupCtx
+{
+  /**
+   * Function to call with the human-readable address.
+   */
+  GNUNET_TRANSPORT_AddressLookUpCallback cb;
+
+  /**
+   * Closure for cb.
+   */
+  void *cb_cls;
+
+  /**
+   * Connection to the service.
+   */
+  struct GNUNET_CLIENT_Connection *client;
+
+  /**
+   * When should this operation time out?
+   */
+  struct GNUNET_TIME_Absolute timeout;
+};
+
+
+/**
+ * Function called with responses from the service.
+ *
+ * @param cls our 'struct AddressLookupCtx*'
+ * @param msg NULL on timeout or error, otherwise presumably a
+ *        message with the human-readable address
+ */
+static void
+peer_address_response_processor (void *cls,
+                                 const struct GNUNET_MessageHeader *msg)
+{
+  struct AddressLookupCtx *alucb = cls;
+  const char *address;
+  uint16_t size;
+
+  if (msg == NULL)
+    {
+      alucb->cb (alucb->cb_cls, NULL);
+      GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
+      GNUNET_free (alucb);
+      return;
+    }
+  GNUNET_break (ntohs (msg->type) == 
GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_REPLY);
+  size = ntohs (msg->size);
+  if (size == sizeof (struct GNUNET_MessageHeader))
+    {
+      /* done! */
+      alucb->cb (alucb->cb_cls, NULL);
+      GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
+      GNUNET_free (alucb);
+      return;
+    }
+  address = (const char *) &msg[1];
+  if (address[size - sizeof (struct GNUNET_MessageHeader) - 1] != '\0')
+    {
+      /* invalid reply */
+      GNUNET_break (0);
+      alucb->cb (alucb->cb_cls, NULL);
+      GNUNET_CLIENT_disconnect (alucb->client, GNUNET_NO);
+      GNUNET_free (alucb);
+      return;
+    }
+  /* expect more replies */
+  GNUNET_CLIENT_receive (alucb->client,
+                        &peer_address_response_processor, alucb,
+                        GNUNET_TIME_absolute_get_remaining
+                        (alucb->timeout));
+  alucb->cb (alucb->cb_cls, address);
+}
+
+
+/**
+ * Return all the known addresses for a peer.
+ *
+ * @param cfg configuration to use
+ * @param peer peer identity to look up the addresses of
+ * @param timeout how long is the lookup allowed to take at most
+ * @param peer_address_callback function to call with the results
+ * @param peer_address_callback_cls closure for peer_address_callback
+ */
+void
+GNUNET_TRANSPORT_peer_address_lookup (const struct GNUNET_CONFIGURATION_Handle 
*cfg,
+                                      const struct GNUNET_PeerIdentity *peer,
+                                      struct GNUNET_TIME_Relative timeout,
+                                      GNUNET_TRANSPORT_AddressLookUpCallback 
peer_address_callback,
+                                      void *peer_address_callback_cls)
+{
+  struct PeerAddressLookupMessage msg;
+  struct GNUNET_TIME_Absolute abs_timeout;
+  struct AddressLookupCtx *peer_address_lookup_cb;
+  struct GNUNET_CLIENT_Connection *client;
+
+  client = GNUNET_CLIENT_connect ("transport", cfg);
+  if (client == NULL)
+    {
+      peer_address_callback (peer_address_callback_cls, NULL);
+      return;
+    }
+  abs_timeout = GNUNET_TIME_relative_to_absolute (timeout);
+
+  msg.header.size = htons (sizeof(struct PeerAddressLookupMessage));
+  msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_PEER_ADDRESS_LOOKUP);
+  msg.timeout = GNUNET_TIME_absolute_hton (abs_timeout);
+  memcpy(&msg.peer, peer, sizeof(struct GNUNET_PeerIdentity));
+  peer_address_lookup_cb = GNUNET_malloc (sizeof (struct AddressLookupCtx));
+  peer_address_lookup_cb->cb = peer_address_callback;
+  peer_address_lookup_cb->cb_cls = peer_address_callback_cls;
+  peer_address_lookup_cb->timeout = abs_timeout;
+  peer_address_lookup_cb->client = client;
+  GNUNET_assert (GNUNET_OK ==
+                GNUNET_CLIENT_transmit_and_get_response (client,
+                                                         &msg.header,
+                                                         timeout,
+                                                         GNUNET_YES,
+                                                         
&peer_address_response_processor,
+                                                         
peer_address_lookup_cb));
+}
+
+/* end of transport_api_peer_address_lookup.c */