internal override async Task <bool> HandleP03FinishHandshake(P03FinishHandshake p)
{
switch (p.ConnectionState)
{
case ConnectionState.CompatibilityMode:
parent.ConnectionVersion = 1; // A VSL 1.1 Server sends this response.
await parent.OnConnectionEstablished();
return(true);
case ConnectionState.Redirect:
parent.ExceptionHandler.CloseConnection("NotSupported",
"This VSL version does not support redirects.",
nameof(PacketHandlerClient));
return(false);
case ConnectionState.NotCompatible:
parent.ExceptionHandler.CloseConnection("ConnectionDenied",
"The specified server denied the connection to this VSL/application version client.",
nameof(PacketHandlerClient));
return(false);
case ConnectionState.Compatible:
parent.ConnectionVersion = p.VSLVersion;
await parent.OnConnectionEstablished();
return(true);
default:
parent.ExceptionHandler.CloseConnection("InvalidConnectionState",
$"The specified ConnectionState.{p.ConnectionState} is invalid",
nameof(PacketHandlerClient));
return(false);
}
}
internal override Task <bool> HandleP03FinishHandshake(P03FinishHandshake p)
{
parent.ExceptionHandler.CloseConnection("InvalidPacket",
"VSL servers can not handle P03FinishHandshake.",
nameof(PacketHandlerServer), nameof(HandleP03FinishHandshake));
return(Task.FromResult(false));
}
internal override async Task <bool> HandleP01KeyExchange(P01KeyExchange p)
{
ushort?vslVersion = VersionManager.GetSharedVersion(parent.Settings.LatestVslVersion, parent.Settings.OldestVslVersion, p.LatestVSL, p.OldestVSL);
ushort?productVersion = VersionManager.GetSharedVersion(latestProduct, oldestProduct, p.LatestProduct, p.OldestProduct);
if (!vslVersion.HasValue || !productVersion.HasValue)
{
return(await parent.Manager.SendPacketAsync(CryptoAlgorithm.None, new P03FinishHandshake(ConnectionState.NotCompatible)));
}
parent.Manager.AesKey = p.AesKey;
parent.ConnectionVersion = vslVersion.Value;
P03FinishHandshake packet;
if (vslVersion.Value < 2)
{
parent.Manager.SendIV = p.ServerIV;
parent.Manager.ReceiveIV = p.ClientIV;
parent.Manager.Ready4Aes = true;
packet = new P03FinishHandshake(ConnectionState.CompatibilityMode);
}
else if (vslVersion.Value == 2)
{
parent.Manager.HmacKey = Util.ConcatBytes(p.ClientIV, p.ServerIV);
parent.Manager.Ready4Aes = true;
packet = new P03FinishHandshake(ConnectionState.Compatible, vslVersion.Value, productVersion.Value);
}
else
{
parent.Manager.SendIV = p.ServerIV;
parent.Manager.ReceiveIV = p.ClientIV;
parent.Manager.HmacKey = Util.ConcatBytes(p.ClientIV, p.ServerIV);
parent.Manager.Ready4Aes = true;
packet = new P03FinishHandshake(ConnectionState.Compatible, vslVersion.Value, productVersion.Value);
}
if (!await parent.Manager.SendPacketAsync(VersionManager.GetNetworkAlgorithm(vslVersion), packet))
{
return(false);
}
await parent.OnConnectionEstablished();
return(true);
}
internal abstract Task <bool> HandleP03FinishHandshake(P03FinishHandshake p);
