public void TreatTLV(PeerAddress a, TLV tlv)
{
try
{
TLV_utils.DataMessage dm;
switch (tlv.type)
{
case TLV.Type.Data:
dm = tlv_utils.getDataMessage(tlv);
if (dm != null && peers.IsSymetricNeighbor(a))
{
MessageIdentifier mid = new MessageIdentifier();
mid.nonce = dm.nonce;
mid.sender = dm.sender;
// Adding message to the flooding list...
if (!recent_messages.ContainsKey(mid))
{
MessageFloodInfo mii = InitNewFloodInfo(dm.msg);
recent_messages[mid] = mii;
new_message_action(mid.sender, dm.msg);
}
// Ack & Remove from flooding list
com.SendMessage(a, messages.PackTLV(tlv_utils.ack(mid.sender, mid.nonce)));
try { recent_messages[mid].neighbors.Remove(a); } catch { }
}
break;
case TLV.Type.Ack:
dm = tlv_utils.getAckMessage(tlv);
if (dm != null && peers.IsSymetricNeighbor(a))
{
MessageIdentifier mid = new MessageIdentifier();
mid.nonce = dm.nonce;
mid.sender = dm.sender;
try { recent_messages[mid].neighbors.Remove(a); } catch { }
}
break;
}
}
catch { }
}
public DataMessage getAckMessage(TLV tlv)
{
try
{
if (tlv.type != TLV.Type.Ack)
{
return(null);
}
if (tlv.body.Length != 12)
{
return(null);
}
DataMessage dm = new DataMessage();
dm.sender = Utils.ToUInt64(tlv.body, 0);
dm.nonce = Utils.ToUInt32(tlv.body, 8);
dm.msg = null;
return(dm);
}
catch { return(null); }
}
// Read the TLV at the given position, and update the pointer offset. Return null if it is a Pad or an incorrect/unknown TLV.
public TLV Read(byte[] buffer, ref int offset)
{
if (buffer == null)
{
return(null);
}
try
{
byte type = buffer[offset];
offset++;
if (type == (byte)TLV.Type.Pad1)
{
return(null);
}
byte length = buffer[offset];
offset++;
byte[] body = new byte[length];
Array.Copy(buffer, offset, body, 0, length);
offset += length;
if (!Enum.IsDefined(typeof(TLV.Type), (int)type))
{
return(null);
}
TLV t = new TLV();
t.type = (TLV.Type)type;
if (t.type == TLV.Type.PadN)
{
return(null);
}
t.body = body;
return(t);
}
catch
{
Utils.Debug("[ERROR] Invalid TLV !");
// We put the pointer to the end of the buffer to avoid reading incorrect TLVs again.
offset = buffer.Length;
}
return(null);
}
public byte?getGoAwayCode(TLV tlv)
{
try
{
if (tlv.type != TLV.Type.GoAway)
{
return(null);
}
try
{
string msg = Encoding.UTF8.GetString(tlv.body, 1, tlv.body.Length - 1);
if (!String.IsNullOrEmpty(msg))
{
Utils.Debug("[GO_AWAY] " + msg);
}
}
catch { Utils.Debug("[ERROR] GoAway invalid message."); }
return(tlv.body[0]);
}
catch { return(null); }
}
public byte[] PackTLV(TLV t)
{
return(PackBody(tlv_reader.Write(t)));
}
