/// <summary>Used internally by the netcode to process a received connection request.</summary>
private void ReceiveRequest(IPEndPoint remote, ArraySegment <byte> packet)
{
// Make sure packet is not too short for header
if (packet.Count < 4)
{
throw new FormatException(string.Format(
"Connection request from {0} with length {1} is too short for header",
remote, packet.Count
));
}
// Extract header
ushort lengthKey = Serializer.ReadUInt16(packet.Array, packet.Offset);
ushort lengthData = Serializer.ReadUInt16(packet.Array, packet.Offset + 2);
int lengthMessage = packet.Count - lengthKey - lengthData - 4;
// Make sure packet is not too short for data
if (packet.Count < 4 + lengthKey + lengthData)
{
throw new FormatException(string.Format(
"Connection request from {0} with length {1} is less than header (4) + key {2} + data {3}",
remote, packet.Count, lengthKey, lengthData
));
}
// Extract data
ArraySegment <byte> key = new ArraySegment <byte>(packet.Array, packet.Offset + 4, lengthKey);
ArraySegment <byte> random = new ArraySegment <byte>(packet.Array, packet.Offset + 4 + lengthKey, lengthData);
ArraySegment <byte> message = new ArraySegment <byte>(packet.Array, 4 + lengthKey + lengthData, lengthMessage);
// Process connection request
using (ConnectionRequest request = new ConnectionRequest(this, remote, key, random))
using (Reader reader = new Reader(message)) {
Peer peer = FindPeer(remote);
if (peer == null)
{
// Peer does not yet exist, notify listener
Listener.OnHostReceiveRequest(request, reader);
}
else
{
// Peer already exists, automatically accept
// This is done because connection requests can be resent
peer.Accept(request);
}
}
}