internal void ReceiveDiscoveryResponse(NetIncomingMessage message)
{
Debug.Assert(message.SenderEndPoint != null);
// Read game info:
DiscoveredGame discoveredGame = DiscoveredGame.ReadFromDiscoveryResponse(owner.appConfig, message);
if (discoveredGame == null) // not a valid response
{
return;
}
// Check if we need to update an existing game:
// (RemoteGameInfo could be versioned, if we were worried about packet ordering)
for (int i = 0; i < discoveryList.Count; i++)
{
if (discoveryList[i].EndPoint.Equals(discoveredGame.EndPoint))
{
discoveryList[i].CopyFrom(discoveredGame);
discoveryListDirty = true;
return;
}
}
// Otherwise just add it:
discoveryList.Add(discoveredGame);
discoveryListDirty = true;
}
internal void CopyFrom(DiscoveredGame other)
{
GameInfo.CopyFrom(other.GameInfo);
EndPoint = other.EndPoint;
expireTime = other.expireTime;
VersionMismatch = other.VersionMismatch;
IsFull = other.IsFull;
applicationData = other.applicationData; // <- assumed to be immutable
}
public void HandleMessage(NetIncomingMessage message, ref bool recycle)
{
Debug.Assert(!didDisconnect);
RemotePeer senderRemotePeer = null;
if (message.SenderConnection != null)
{
senderRemotePeer = message.SenderConnection.Tag as RemotePeer;
}
try
{
switch (message.MessageType)
{
case NetIncomingMessageType.DiscoveryRequest: // (Clients trying to find LAN games)
{
var response = NetPeer.CreateMessage();
DiscoveredGame.WriteDiscoveryResponse(owner.appConfig, response, owner.GameInfo, IsFull,
owner.NetworkApplication.GetDiscoveryData());
NetPeer.SendDiscoveryResponse(response, message.SenderEndPoint);
}
break;
case NetIncomingMessageType.StatusChanged:
var status = (NetConnectionStatus)message.ReadByte();
switch (status)
{
case NetConnectionStatus.Connected:
HandleConnection(message.SenderConnection);
break;
case NetConnectionStatus.Disconnected:
HandleDisconnection(message.SenderConnection, message);
break;
}
break;
case NetIncomingMessageType.UnconnectedData:
HandleUnconnectedMessage(message);
break;
case NetIncomingMessageType.Data:
HandleNetworkManagementFromClient(message);
break;
}
}
catch (NetworkDataException exception)
{
NetworkDataError(senderRemotePeer, exception);
}
}
public static DiscoveredGame FakeGame()
{
const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
var random = new Random();
var name = new string(Enumerable.Repeat(chars, 14).Select(s => s[random.Next(s.Length)]).ToArray());
var game = new DiscoveredGame();
game.GameInfo = new GameInfo(name, false, false);
game.EndPoint = new IPEndPoint(IPAddress.Parse("255.255.255.255"), 65535);
game.IsFull = true;
return(game);
}
public static DiscoveredGame ReadFromDiscoveryResponse(NetworkAppConfig appConfig, NetIncomingMessage message)
{
try
{
// START: Version safe data
// {
var theirAppId = message.ReadString();
if (theirAppId != appConfig.AppId)
{
return(null); // Wrong application
}
var gameName = message.ReadString().FilterName();
var theirAppVersion = message.ReadUInt16();
var theirAppSignatureLength = (int)message.ReadVariableUInt32();
byte[] theirAppSignature;
if (theirAppSignatureLength < 0 ||
theirAppSignatureLength > NetworkAppConfig.ApplicationSignatureMaximumLength)
{
theirAppSignature = null;
}
else
{
theirAppSignature = message.ReadBytes(theirAppSignatureLength);
}
// }
// END: Version safe data
// Check for version mismatch
if (theirAppVersion != appConfig.ApplicationVersion || theirAppSignature == null ||
!appConfig.ApplicationSignature.SequenceEqual(theirAppSignature))
{
var gi = new GameInfo(gameName);
var dg = new DiscoveredGame(message);
dg.GameInfo = gi;
if (theirAppVersion < appConfig.ApplicationVersion)
{
dg.VersionMismatch = -1;
}
else if (theirAppVersion > appConfig.ApplicationVersion)
{
dg.VersionMismatch = 1;
}
else
{
dg.VersionMismatch = 0;
}
Debug.Assert(dg.VersionMismatch.HasValue);
return(dg);
}
// If we get here, all the versioning is correct:
{
var isInternetGame = message.ReadBoolean();
var gi = new GameInfo(gameName, isInternetGame,
false); // <- NOTE: we are assuming that the side-channel handles discovery
var dg = new DiscoveredGame(message);
dg.GameInfo = gi;
dg.IsFull = message.ReadBoolean();
dg.applicationData = message.ReadByteArray();
return(dg);
}
}
catch
{
return(null);
}
}
