C# Proxy using Sockets, how should I do this?

3
votes

I'm writing a proxy using .NET and C#. I haven't done much Socket programming, and I am not sure the best way to go about it. What would be the best way to implement this? Should I use Synchronous Sockets, Asynchronous sockets? Please help!

It must...

  • Accept Connections from the client on two different ports, and be able to receive data on both ports at the same time.

  • Connect to the server on two different ports, and be able to send data on both ports as the same time.

  • Immediately connect to the server and start forwarding packets as soon as a client connection is made.

  • Forward packets in the same order they were received.

  • Be as low latency as possible.

  • I don't need the ability for multiple clients to connect to the proxy, but it would be a nice feature if its easy to implement.

Client --------- Proxy ------- Server
---|-----------------|----------------|
Port <--------> Port <-------> Port
Port <--------> Port <-------> Port

2
c#.netsocketsproxy
Can you limit your code to running on Windows Server 2008? - James Westgate
No, it has to at least run on Windows 7. - Kin

2 Answers

3
votes

I've tinkered with this source code before. It was done well, recommended.

1
votes

Please check out PortFusion! It is a complete, actively-used and -developed distributed reverse proxy solution for all TCP-based traffic. It is written for .NET 4.0 and comes with full source code.

I have tested ReceiveAsync and SendAsync methods introduced in .NET 3.5 but have not found them to reach as high a throughput as is possible with synchronous ones - Async ones should scale better in case of a great number of concurrent clients though.

Maximum throughput for a controlled number clients: use synchronous methods Reaching maximum number of concurrent connections: async