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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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libssh2_channel_forward_listen_ex(3)				  libssh2 manual			      libssh2_channel_forward_listen_ex(3)

NAME
libssh2_channel_forward_listen_ex - listen to inbound connections SYNOPSIS
#include <libssh2.h> LIBSSH2_LISTENER * libssh2_channel_forward_listen_ex(LIBSSH2_SESSION *session, char *host, int port, int *bound_port, int queue_maxsize); LIBSSH2_LISTENER * libssh2_channel_forward_listen(LIBSSH2_SESSION *session, int port); DESCRIPTION
Instruct the remote SSH server to begin listening for inbound TCP/IP connections. New connections will be queued by the library until accepted by libssh2_channel_forward_accept(3). session - instance as returned by libssh2_session_init(). host - specific address to bind to on the remote host. Binding to 0.0.0.0 (default when NULL is passed) will bind to all available addresses. port - port to bind to on the remote host. When 0 is passed, the remote host will select the first available dynamic port. bound_port - Populated with the actual port bound on the remote host. Useful when requesting dynamic port numbers. queue_maxsize - Maximum number of pending connections to queue before rejecting further attempts. libssh2_channel_forward_listen(3) is a macro. RETURN VALUE
A newly allocated LIBSSH2_LISTENER instance or NULL on failure. ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed. LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket. LIBSSH2_ERROR_PROTO - An invalid SSH protocol response was received on the socket. LIBSSH2_ERROR_REQUEST_DENIED - The remote server refused the request. LIBSSH2_ERROR_EAGAIN - Marked for non-blocking I/O but the call would block. SEE ALSO
libssh2_channel_forward_accept(3) libssh2 0.15 1 Jun 2007 libssh2_channel_forward_listen_ex(3)
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