private async void ServerOnClientConnected(object sender, TcpClientEventArgs e)
{
_server.BeginAccept();
var client = new Socks5Client(e.Client)
{
ProxySending = args => ProxySending?.Invoke(this, args),
ProxyReceiving = args => ProxyReceiving?.Invoke(this, args)
};
client.InternalClient.ClientDisconnected += (o, args)
=> ClientDisconnected?.Invoke(this, new SocksClientEventArgs(client));
if (await HandleGreeting(client))
ClientConnected?.Invoke(this, new SocksClientEventArgs(client));
else
InvalidClientConnected?.Invoke(this, new TcpClientEventArgs(e.Client));
await HandleConnectionInitiate(client);
var buf = client.Receive(new byte[100]);
client.StartTunneling();
_clients.Add(client);
}
private static async Task<bool> HandleGreeting(Socks5Client client)
{
// TODO: Add state or something?
var greetingRequest = await client.InternalClient.ReceiveSerializable<Socks5GreetingRequest>();
if (greetingRequest == null)
return false;
// TODO: Authentication handling
var greetingResponse = new Socks5GreetingResponse(SocksAuthentication.NoAuthentication);
return await client.InternalClient.SendSerializable(greetingResponse);
}
private static async Task<bool> HandleConnectionInitiate(Socks5Client client)
{
var connectionRequest = await client.InternalClient.ReceiveSerializable<Socks5ConnectionRequest>();
if (connectionRequest == null)
return false;
// TODO: Add validation etc.
var success = await client.ConnectWith(connectionRequest.EndPoint);
var status = success ? SocksResponseStatus.OK : SocksResponseStatus.GeneralFailure;
var connectionResponse = new Socks5ConnectionResponse(status, connectionRequest);
return await client.InternalClient.SendSerializable(connectionResponse);
}
public ClientEventArgs(Socks5Client client)
{
Client = client;
}