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Full Discussion: WebSocket over SSH tunnel - is it possible?
Special Forums IP Networking Proxy Server WebSocket over SSH tunnel - is it possible? Post 302931468 by Vladislav on Tuesday 13th of January 2015 09:22:37 AM
Old 01-13-2015
Computer WebSocket over SSH tunnel - is it possible?
Hello,

I have a video streaming application that utilizes a WebSocket for the server <-> client communication. My goal is to make the video streaming service available over the internet in the cases where neither the server nor client have public IPs.

One way to do this is over a VPN connection, but I prefer not to use a VPN at all. That's why I decided to try and forward the communication over an SSH server via remote port forwarding.

However I am facing an issue - forwarding the server socket is pretty straight-forward, but I have no way to know in advance what the randomly allocated client port will be, so the traffic will flow only in the direction client -> SSH server -> streaming server.

When the SSH relay point receives the responses from the streaming server it does not automatically route them back to the client and the WebSocket handshake cannot be completed.

Do you think it is possible to overcome this issue or should I drop the WebSocket altogether and revert to a normal HTTP / TCP connection?

Thanks!
 

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LEARN ABOUT DEBIAN

libssh2_channel_direct_tcpip_ex

libssh2_channel_direct_tcpip_ex(3)				  libssh2 manual				libssh2_channel_direct_tcpip_ex(3)

NAME

       libssh2_channel_direct_tcpip_ex - Tunnel a TCP connection through an SSH session

SYNOPSIS

       #include <libssh2.h>

       LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip_ex(LIBSSH2_SESSION *session, const char *host, int port, const char *shost, int sport);

       LIBSSH2_CHANNEL * libssh2_channel_direct_tcpip(LIBSSH2_SESSION *session, const char *host, int port);

DESCRIPTION

       session - Session instance as returned by libssh2_session_init_ex(3)

       host - Third party host to connect to using the SSH host as a proxy.

       port - Port on third party host to connect to.

       shost - Host to tell the SSH server the connection originated on.

       sport - Port to tell the SSH server the connection originated from.

       Tunnel  a TCP/IP connection through the SSH transport via the remote host to a third party. Communication from the client to the SSH server
       remains encrypted, communication from the server to the 3rd party host travels in cleartext.

RETURN VALUE

       Pointer to a newly allocated LIBSSH2_CHANNEL instance, or NULL on errors.

ERRORS

       LIBSSH2_ERROR_ALLOC -  An internal memory allocation call failed.

SEE ALSO

       libssh2_session_init_ex(3)

libssh2 0.15							    1 Jun 2007					libssh2_channel_direct_tcpip_ex(3)
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