From b632600b500f08d52cc1105314dcca49bd09a189 Mon Sep 17 00:00:00 2001
From: Bart Polot <bart@net.in.tum.de>
Date: Tue, 4 Feb 2014 12:36:36 +0000
Subject: [PATCH] Use stored hellos to try to establish direct connections to
 peers with tunnels

---
 src/mesh/Makefile.am                |  2 ++
 src/mesh/gnunet-service-mesh_peer.c | 46 ++++++++++++++++++++++++++---
 src/mesh/gnunet-service-mesh_peer.h |  4 +--
 3 files changed, 46 insertions(+), 6 deletions(-)

diff --git a/src/mesh/Makefile.am b/src/mesh/Makefile.am
index 5c2dc84dc..fdb55cd58 100644
--- a/src/mesh/Makefile.am
+++ b/src/mesh/Makefile.am
@@ -76,6 +76,7 @@ gnunet_service_mesh_SOURCES = \
 gnunet_service_mesh_CFLAGS = $(AM_CFLAGS)
 gnunet_service_mesh_LDADD = \
   $(top_builddir)/src/util/libgnunetutil.la \
+  $(top_builddir)/src/transport>/libgnunettransport.la \
   $(top_builddir)/src/core/libgnunetcore.la \
   $(top_builddir)/src/dht/libgnunetdht.la \
   $(top_builddir)/src/statistics/libgnunetstatistics.la \
@@ -83,6 +84,7 @@ gnunet_service_mesh_LDADD = \
   $(top_builddir)/src/block/libgnunetblock.la
 gnunet_service_mesh_DEPENDENCIES = \
   $(top_builddir)/src/util/libgnunetutil.la \
+  $(top_builddir)/src/transport/libgnunettransport.la \
   $(top_builddir)/src/core/libgnunetcore.la \
   $(top_builddir)/src/dht/libgnunetdht.la \
   $(top_builddir)/src/statistics/libgnunetstatistics.la \
diff --git a/src/mesh/gnunet-service-mesh_peer.c b/src/mesh/gnunet-service-mesh_peer.c
index 244839f44..55c279c98 100644
--- a/src/mesh/gnunet-service-mesh_peer.c
+++ b/src/mesh/gnunet-service-mesh_peer.c
@@ -22,6 +22,7 @@
 #include "platform.h"
 #include "gnunet_util_lib.h"
 
+#include "gnunet_transport_service.h"
 #include "gnunet_core_service.h"
 #include "gnunet_statistics_service.h"
 
@@ -163,7 +164,7 @@ struct MeshPeer
   /**
    * Hello message.
    */
-  const struct GNUNET_HELLO_Message* hello;
+  struct GNUNET_HELLO_Message* hello;
 };
 
 
@@ -206,6 +207,8 @@ static unsigned long long drop_percent;
  */
 static struct GNUNET_CORE_Handle *core_handle;
 
+static struct GNUNET_TRANSPORT_Handle *transport_handle;
+
 
 /******************************************************************************/
 /***************************** CORE CALLBACKS *********************************/
@@ -1292,12 +1295,17 @@ GMP_init (const struct GNUNET_CONFIGURATION_Handle *c)
                                      NULL,      /* Don't notify about all outbound messages */
                                      GNUNET_NO, /* For header-only out notification */
                                      core_handlers);    /* Register these handlers */
-  if (NULL == core_handle)
+  transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id,
+                                        NULL, /* cls */
+                                        NULL, NULL, NULL); /* Notify callbacks */
+
+  if (NULL == core_handle || NULL == transport_handle)
   {
     GNUNET_break (0);
     GNUNET_SCHEDULER_shutdown ();
     return;
   }
+
 }
 
 /**
@@ -1362,6 +1370,24 @@ GMP_get_short (const GNUNET_PEER_Id peer)
 }
 
 
+/**
+ * Try to connect to a peer on transport level.
+ *
+ * @param cls Closure (peer).
+ * @param tc TaskContext.
+ */
+static void
+try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+  struct MeshPeer *peer = cls;
+
+  if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
+    return;
+
+  GNUNET_TRANSPORT_try_connect (transport_handle,
+                                GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
+}
+
 /**
  * Try to establish a new connection to this peer (in its tunnel).
  * If the peer doesn't have any path to it yet, try to get one.
@@ -1375,9 +1401,21 @@ GMP_connect (struct MeshPeer *peer)
   struct MeshTunnel3 *t;
   struct MeshPeerPath *p;
   struct MeshConnection *c;
+  struct GNUNET_HELLO_Message *hello;
   int rerun_search;
 
   LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GMP_2s (peer));
+
+  /* If we have a current hello, try to connect using it. */
+  hello = GMP_get_hello (peer);
+  if (NULL != hello)
+  {
+    struct GNUNET_MessageHeader *mh;
+
+    mh = GNUNET_HELLO_get_header (hello);
+    GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer);
+  }
+
   t = peer->tunnel;
   c = NULL;
   rerun_search = GNUNET_NO;
@@ -1840,7 +1878,7 @@ GMP_get_tunnel (const struct MeshPeer *peer)
  * @param hello Hello message.
  */
 void
-GMP_set_hello (struct MeshPeer *peer, const struct GNUNET_HELLO_Message *hello)
+GMP_set_hello (struct MeshPeer *peer, struct GNUNET_HELLO_Message *hello)
 {
   struct GNUNET_TIME_Absolute expiration;
   struct GNUNET_TIME_Relative remaining;
@@ -1870,7 +1908,7 @@ GMP_set_hello (struct MeshPeer *peer, const struct GNUNET_HELLO_Message *hello)
  *
  * @return Hello message.
  */
-const struct GNUNET_HELLO_Message *
+struct GNUNET_HELLO_Message *
 GMP_get_hello (struct MeshPeer *peer)
 {
   struct GNUNET_TIME_Absolute expiration;
diff --git a/src/mesh/gnunet-service-mesh_peer.h b/src/mesh/gnunet-service-mesh_peer.h
index d5c189d53..586cf5d06 100644
--- a/src/mesh/gnunet-service-mesh_peer.h
+++ b/src/mesh/gnunet-service-mesh_peer.h
@@ -325,7 +325,7 @@ GMP_get_tunnel (const struct MeshPeer *peer);
  * @param hello Hello message.
  */
 void
-GMP_set_hello (struct MeshPeer *peer, const struct GNUNET_HELLO_Message *hello);
+GMP_set_hello (struct MeshPeer *peer, struct GNUNET_HELLO_Message *hello);
 
 /**
  * Get the hello message.
@@ -334,7 +334,7 @@ GMP_set_hello (struct MeshPeer *peer, const struct GNUNET_HELLO_Message *hello);
  *
  * @return Hello message.
  */
-const struct GNUNET_HELLO_Message *
+struct GNUNET_HELLO_Message *
 GMP_get_hello (struct MeshPeer *peer);
 
 /**
-- 
2.25.1