/// <summary>
/// Create a connection to a remote endpoint
/// </summary>
public virtual NetConnection Connect(NetEndPoint remoteEndPoint, NetOutgoingMessage hailMessage)
{
if (remoteEndPoint == null)
{
throw new ArgumentNullException("remoteEndPoint");
}
if (m_configuration.DualStack)
{
remoteEndPoint = NetUtility.MapToIPv6(remoteEndPoint);
}
lock (m_connections)
{
if (m_status == NetPeerStatus.NotRunning)
{
throw new NetException("Must call Start() first");
}
if (m_connectionLookup.ContainsKey(remoteEndPoint))
{
throw new NetException("Already connected to that endpoint!");
}
NetConnection hs;
if (m_handshakes.TryGetValue(remoteEndPoint, out hs))
{
// already trying to connect to that endpoint; make another try
switch (hs.m_status)
{
case NetConnectionStatus.InitiatedConnect:
// send another connect
hs.m_connectRequested = true;
break;
case NetConnectionStatus.RespondedConnect:
// send another response
hs.SendConnectResponse(NetTime.Now, false);
break;
default:
// weird
LogWarning("Weird situation; Connect() already in progress to remote endpoint; but hs status is " + hs.m_status);
break;
}
return(hs);
}
NetConnection conn = new NetConnection(this, remoteEndPoint);
conn.SetStatus(NetConnectionStatus.InitiatedConnect, "user called connect");
conn.m_localHailMessage = hailMessage;
// handle on network thread
conn.m_connectRequested = true;
conn.m_connectionInitiator = true;
m_handshakes.Add(remoteEndPoint, conn);
return(conn);
}
}
internal bool ActuallySendPacket(byte[] data, int numBytes, NetEndPoint target, out bool connectionReset)
{
connectionReset = false;
target = NetUtility.MapToIPv6(target);
IPAddress ba = default(IPAddress);
try
{
ba = NetUtility.GetCachedBroadcastAddress();
// TODO: refactor this check outta here
if (target.Address == ba)
{
// Some networks do not allow
// a global broadcast so we use the BroadcastAddress from the configuration
// this can be resolved to a local broadcast addresss e.g 192.168.x.255
target.Address = m_configuration.BroadcastAddress;
m_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true);
}
int bytesSent = m_socket.SendTo(data, 0, numBytes, SocketFlags.None, target);
if (numBytes != bytesSent)
{
LogWarning("Failed to send the full " + numBytes + "; only " + bytesSent + " bytes sent in packet!");
}
// LogDebug("Sent " + numBytes + " bytes");
}
catch (SocketException sx)
{
if (sx.SocketErrorCode == SocketError.WouldBlock)
{
// send buffer full?
LogWarning("Socket threw exception; would block - send buffer full? Increase in NetPeerConfiguration");
return(false);
}
if (sx.SocketErrorCode == SocketError.ConnectionReset)
{
// connection reset by peer, aka connection forcibly closed aka "ICMP port unreachable"
connectionReset = true;
return(false);
}
LogError("Failed to send packet: " + sx);
}
catch (Exception ex)
{
LogError("Failed to send packet: " + ex);
}
finally
{
if (target.Address == ba)
{
m_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, false);
}
}
return(true);
}
/// <summary>
/// Create a connection to a remote endpoint.
/// </summary>
public virtual NetConnection Connect(IPEndPoint remoteEndPoint, NetOutgoingMessage?hailMessage)
{
if (remoteEndPoint == null)
{
throw new ArgumentNullException(nameof(remoteEndPoint));
}
if (Configuration.DualStack)
{
remoteEndPoint = NetUtility.MapToIPv6(remoteEndPoint);
}
if (Status == NetPeerStatus.NotRunning)
{
throw new LidgrenException("Must call Start() first.");
}
if (ConnectionLookup.ContainsKey(remoteEndPoint))
{
throw new LidgrenException("Already connected to that endpoint!");
}
if (Handshakes.TryGetValue(remoteEndPoint, out NetConnection? hs))
{
// already trying to connect to that endpoint; make another try
switch (hs.Status)
{
case NetConnectionStatus.InitiatedConnect:
// send another connect
hs._connectRequested = true;
break;
case NetConnectionStatus.RespondedConnect:
// send another response
hs.SendConnectResponse(NetTime.Now, false);
break;
default:
// weird
LogWarning(NetLogMessage.FromValues(NetLogCode.UnexpectedHandshakeStatus, value: (int)hs.Status));
break;
}
return(hs);
}
var conn = new NetConnection(this, remoteEndPoint);
conn.Status = NetConnectionStatus.InitiatedConnect;
conn.LocalHailMessage = hailMessage;
// handle on network thread
conn._connectRequested = true;
conn._connectionInitiator = true;
Handshakes.TryAdd(remoteEndPoint, conn);
return(conn);
}
// TODO: replace byte[] with Memory<byte> in the future (held back by Socket.SendTo)
// https://github.com/dotnet/runtime/issues/33418
internal NetSocketResult ActuallySendPacket(byte[] data, int byteCount, IPEndPoint target)
{
Socket?socket = Socket;
Debug.Assert(socket != null);
bool broadcasting = false;
try
{
IPAddress?ba = NetUtility.GetBroadcastAddress();
// TODO: refactor this check outta here
if (target.Address.Equals(ba))
{
// Some networks do not allow
// a global broadcast so we use the BroadcastAddress from the configuration
// this can be resolved to a local broadcast addresss e.g 192.168.x.255
_targetCopy.Address = Configuration.BroadcastAddress;
_targetCopy.Port = target.Port;
socket.EnableBroadcast = true;
broadcasting = true;
}
else if (
Configuration.DualStack &&
Configuration.LocalAddress.AddressFamily == AddressFamily.InterNetworkV6)
{
// Maps to IPv6 for Dual Mode
NetUtility.MapToIPv6(target, _targetCopy);
}
else
{
_targetCopy.Port = target.Port;
_targetCopy.Address = target.Address;
}
int bytesSent = socket.SendTo(data, 0, byteCount, SocketFlags.None, _targetCopy);
if (byteCount != bytesSent)
{
LogWarning(NetLogMessage.FromValues(NetLogCode.FullSendFailure,
endPoint: target,
value: bytesSent,
maxValue: byteCount));
}
//LogDebug("Sent " + numBytes + " bytes");
}
catch (SocketException sx)
{
switch (sx.SocketErrorCode)
{
case SocketError.WouldBlock:
// send buffer full?
LogDebug(new NetLogMessage(NetLogCode.SocketWouldBlock, sx));
return(new NetSocketResult(false, false));
case SocketError.ConnectionReset:
// connection reset by peer, aka connection forcibly closed aka "ICMP port unreachable"
return(new NetSocketResult(false, true));
default:
LogError(new NetLogMessage(NetLogCode.SendFailure, sx, target));
break;
}
}
catch (Exception ex)
{
LogError(new NetLogMessage(NetLogCode.SendFailure, ex, target));
}
finally
{
if (broadcasting)
{
socket.EnableBroadcast = false;
}
}
return(new NetSocketResult(true, false));
}
