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Special Forums IP Networking Proxy Server WebSocket over SSH tunnel - is it possible? Post 302931498 by Vladislav on Tuesday 13th of January 2015 11:13:10 AM
Old 01-13-2015
The setup is quite simple actually - there is a WebSocket server and a WebSocket client connecting to it.

My idea is to be able to indirectly access the WebSocket server by forwarding it's listening port to a machine with a real IP address. (in the case when the server is behind a router or firewall and using standard NAT forwarding / routing is not an option - e.g. on two devices accessing the Internet through a mobile data connection)

The problem is that the WebSocket client will always allocate a random port when initializing the communication and the SSH-relay point has no idea how to handle the responses coming from the server on that port.

What makes it even worse is that SSH will open yet another TCP socket (again on a random port) which will be then used to forward the client's request to the actual WebSocket server over the SSH tunnel.
So, if I want to make this work I will have to build a second SSH tunnel from the WebSocket client, in an attempt to bridge the SSH generated client socket to the original one, which makes this a somewhat complicated task...
 

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bubbros-server(6)						   Games Manual 						 bubbros-server(6)

NAME
bubbros-server - the bub-n-bros server. SYNOPSIS
bubbros-server [ level-file.bin ] [options] DESCRIPTION
bubbros-server starts an http server that acts as a control panel for the server. The server listens on port 8000 by default. The url for the control panel is http://server:port/0xN where 0xN is a random hex number (acts as minimal protection). This url is printed when the server starts. You can start and view games and kill the server from this panel. The control panel also allows you to type in the address of a server to connect to, the script will then open a client to that server. The http server also servers java applet clients for those players who wish to use one. When a game is started the script opens a port for the game server. This port can then be connected to by a client. Clients autodetect servers running on the local network with UDP ping on port 8056. Connection forming The client forms a tcp connection to the server. Or, when using the metaserver, the server forms a connection to the client. If this fails, the client and server try a simultaneous SYN connect. This sometimes works if the server and client are behind firewalls. The server then tries to transmit the data over udp. If it gets no response from the client it will fall back to the existing tcp connection. OPTIONS
-b N, --begin N, --start N Start at board (level) number N. The default is 1. See also the -s option. -h, --help Display help. -i, --infinite Restart the server at the end of the game. Normally the server quits after a certain period of inactivity. This is useful when used with the -m option to make a public server that is available for a long time. -l N, --lives N Limit number of lives to N. If this option is not specified the number of lives will be infinite. -m, --metaserver Register server with the Metaserver (currently) at codespeak.net:8050. This makes your server visible to everybody, and also facil- itates joining through a fascistic firewall. --port TYPE=N Sets default listening ports. If type is LISTEN , sets the game server port to N. The game server port is chosen randomly by default. If the type is HTTP , sets the http server port to N. The http server port defaults to 8000. Another port will be chosen if none was specified and 8000 is already in use. The server also listens to UDP ping on port 8056. -s N, --step N Increase board number with N when a board is completed. Defaults to 1. see also the -b option. OUTPUT
The server outputs helpful debug information concerning the http and game servers. SEE ALSO
bubbros(6) bubbros-client(6) December 7, 2007 bubbros-server(6)
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