[GNUnet-SVN] r28391 - gnunet/src/mesh

[gnunet]

Author: bartpolot
Date: 2013-08-05 11:48:32 +0200 (Mon, 05 Aug 2013)
New Revision: 28391

Modified:
   gnunet/src/mesh/gnunet-service-mesh-enc.c
Log:
- wip


Modified: gnunet/src/mesh/gnunet-service-mesh-enc.c
===================================================================
--- gnunet/src/mesh/gnunet-service-mesh-enc.c   2013-08-04 18:43:31 UTC (rev 
28390)
+++ gnunet/src/mesh/gnunet-service-mesh-enc.c   2013-08-05 09:48:32 UTC (rev 
28391)
@@ -4712,7 +4712,192 @@
   return GNUNET_OK;
 }
 
+
 /**
+ * Generic handler for mesh network encrypted traffic.
+ *
+ * @param peer Peer identity this notification is about.
+ * @param message Data message.
+ * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
+ *
+ * @return GNUNET_OK to keep the connection open,
+ *         GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_encrypted (const struct GNUNET_PeerIdentity *peer,
+                       const struct GNUNET_MESH_Encrypted *msg,
+                       int fwd)
+{
+  struct MeshTunnel *t;
+  struct MeshConnection *c;
+  GNUNET_PEER_Id hop;
+  uint32_t pid;
+  uint32_t ttl;
+  uint16_t type;
+  size_t size;
+
+  /* Check size */
+  size = ntohs (msg->header.size);
+  if (size <
+      sizeof (struct GNUNET_MESH_Encrypted) +
+      sizeof (struct GNUNET_MessageHeader))
+  {
+    GNUNET_break (0);
+    return GNUNET_OK;
+  }
+  type = ntohs (msg->header.type);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
+              GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
+
+  /* Check connection */
+  c = connection_get (&msg->tid, ntohl (msg->cid));
+  if (NULL == c)
+  {
+    GNUNET_STATISTICS_update (stats, "# unknown connection", 1, GNUNET_NO);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING connection unknown\n");
+    return GNUNET_OK;
+  }
+  t = c->t;
+
+  /*  Initialize FWD/BCK data */
+  pid = ntohl (msg->pid);
+  if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
+  {
+    GNUNET_STATISTICS_update (stats, "# unsolicited data", 1, GNUNET_NO);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                "WARNING Received PID %u, (prev %u), ACK %u\n",
+                pid, fc->last_pid_recv, fc->last_ack_sent);
+    return GNUNET_OK;
+  }
+  if (NULL != c)
+    tunnel_change_state (t, MESH_TUNNEL_READY);
+  tunnel_reset_timeout (t, fwd);
+  if (NULL != c)
+  {
+    /* TODO signature verification */
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "  it's for us! sending to client\n");
+    GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
+    if (GMC_is_pid_bigger (pid, fc->last_pid_recv))
+    {
+      uint32_t mid;
+
+      mid = ntohl (msg->mid);
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  " pid %u (mid %u) not seen yet\n", pid, mid);
+      fc->last_pid_recv = pid;
+
+      if (GNUNET_NO == t->reliable ||
+          ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
+            GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
+      {
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                    "!!! RECV %u\n", ntohl (msg->mid));
+        if (GNUNET_YES == t->reliable)
+        {
+          /* Is this the exact next expected messasge? */
+          if (mid == rel->mid_recv)
+          {
+            GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
+            rel->mid_recv++;
+            tunnel_send_client_data (t, msg, fwd);
+            tunnel_send_client_buffered_data (t, c, rel);
+          }
+          else
+          {
+            GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
+            tunnel_add_buffered_data (t, msg, rel);
+          }
+        }
+        else /* Tunnel unreliable, send to clients directly */
+        {
+          tunnel_send_client_data (t, msg, fwd);
+        }
+      }
+      else
+      {
+        GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                    " MID %u not expected (%u - %u), dropping!\n",
+                    ntohl (msg->mid), rel->mid_recv, rel->mid_recv + 64);
+      }
+    }
+    else
+    {
+//       GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
+      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+                  " Pid %u not expected (%u+), dropping!\n",
+                  pid, fc->last_pid_recv + 1);
+    }
+    tunnel_send_ack (t, type, fwd);
+    return GNUNET_OK;
+  }
+  fc->last_pid_recv = pid;
+  if (0 == hop)
+  {
+    GNUNET_STATISTICS_update (stats, "# data on dying tunnel", 1, GNUNET_NO);
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "data on dying tunnel %s[%X]\n",
+                GNUNET_PEER_resolve2 (t->id.oid), ntohl (msg->tid));
+    return GNUNET_OK; /* Next hop has destoyed the tunnel, drop */
+  }
+  ttl = ntohl (msg->ttl);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "   ttl: %u\n", ttl);
+  if (ttl == 0)
+  {
+    GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
+    tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, fwd);
+    return GNUNET_OK;
+  }
+
+  if (myid != hop)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "  not for us, retransmitting...\n");
+    send_prebuilt_message (message, hop, t);
+    GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
+  }
+  return GNUNET_OK;
+}
+
+
+/**
+ * Core handler for mesh network traffic going orig->dest.
+ *
+ * @param cls Closure (unused).
+ * @param message Message received.
+ * @param peer Peer who sent the message.
+ *
+ * @return GNUNET_OK to keep the connection open,
+ *         GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_fwd (void *cls, const struct GNUNET_PeerIdentity *peer,
+                     const struct GNUNET_MessageHeader *message)
+{
+  return handle_mesh_encrypted (peer,
+                                (struct GNUNET_MESH_Encrypted *)message,
+                                GNUNET_YES);
+}
+
+/**
+ * Core handler for mesh network traffic going dest->orig.
+ *
+ * @param cls Closure (unused).
+ * @param message Message received.
+ * @param peer Peer who sent the message.
+ *
+ * @return GNUNET_OK to keep the connection open,
+ *         GNUNET_SYSERR to close it (signal serious error)
+ */
+static int
+handle_mesh_bck (void *cls, const struct GNUNET_PeerIdentity *peer,
+                     const struct GNUNET_MessageHeader *message)
+{
+  return handle_mesh_encrypted (peer,
+                                (struct GNUNET_MESH_Encrypted *)message,
+                                GNUNET_NO);
+}
+
+
+/**
  * Core handler for mesh network traffic point-to-point acks.
  *
  * @param cls closure
@@ -4913,15 +5098,11 @@
   {&handle_mesh_connection_ack, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK,
     sizeof (struct GNUNET_MESH_ConnectionACK)},
   {&handle_mesh_connection_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN,
-   sizeof (struct GNUNET_MESH_ConnectionBroken)},
+    sizeof (struct GNUNET_MESH_ConnectionBroken)},
   {&handle_mesh_connection_destroy, 
GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY,
-   sizeof (struct GNUNET_MESH_ConnectionDestroy)},
-  {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
-  {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
-  {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK,
-    sizeof (struct GNUNET_MESH_DataACK)},
-  {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK,
-    sizeof (struct GNUNET_MESH_DataACK)},
+    sizeof (struct GNUNET_MESH_ConnectionDestroy)},
+  {&handle_mesh_fwd, GNUNET_MESSAGE_TYPE_MESH_FWD, 0},
+  {&handle_mesh_bck, GNUNET_MESSAGE_TYPE_MESH_BCK, 0},
   {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
     sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
   {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,