proxysocks

Socks 4 Bind Request Explanation


i was reading this topic http://ftp.icm.edu.pl/packages/socks/socks4/SOCKS4.protocol

What I'm trying to do is:
I have a client/server application, I'm trying to use socks 4 BIND request to bind my server to a remote socks server, and make the clients connect to that socks server and the socks server will make them connect to my server (at least that's how I understand socks BIND request)

But I don't fully understand it (my English is kinda bad), what I'm asking is, is it possible to do so when I don't know any of the remote IPs of the clients? Since the server's BIND request package must contain the address of the remote client and I don't really have than since the clients are from unknown users retrieving status info from my server (or can I use 0 for INANY_ADDR) ?


Solution

  • What you are asking for is not possible with SOCKS, nor is it meant for that purpose. Read the spec again more carefully. The BIND command is meant for use with multi-connection protocols (like FTP), where a primary connection is used to communicate between a client and a server, and BIND facilitates situations where the server needs to connect a secondary connection to the client after the client tells the server where to connect. In that situation, the client would issue a BIND command to SOCKS telling it the server's IP/Port so it only accepts that connection, then send the resulting SOCKS listening IP/Port to the server to connect to.

    What you are asking for is better served by using a router with Port Forwarding rules defined. Then you can open a listening port on the router that accepts any inbound connection and forwards it to your app's listening IP/Port. Most modern routers support uPNP (Universal Plug-N-Play) so you can configure the forwarding rules programmably instead of requiring admin access to the router's configuration software.