Re: [SLE] Monitor port and start ssh tunnel. Is there such a beast?

You were absolutely right, xinetd did it. If anyone cares to know the details, here they are: I wanted to be able to create a tunnel automatically when I connect to localhost port 1234 to a remote port 25 in order to tunnel through the office's block on port 25. 1) Create a file in /etc/xinetd.d/ and call it something like tunnel_smtp The content of the file: ---------- BEGIN tunnel_smtp ----------- service tunnel_smtp { type = UNLISTED port = 1234 socket_type = stream protocol = tcp wait = no user = your_user_name disable = no server = /usr/bin/ssh server_args = remote -T socat - TCP4:mail:25 groups = yes bind = 127.0.0.1 } ---------- END tunnel_smtp ----------- Replace with the name of the user you want ssh to connect to the remote server. Replace <remote> with the the address of the remote server ssh will connect to. Replace <mail> with the address of the mail server. If the <remote> and <mail> are the same you can use localhost for <mail> socat has to be installed on the remote server. Instead of socat you can use netcat and then you should be able to replace the server_args line with: server_args = remote -T nc mail smtp I did not test the solution with netcat, only with socat so no guarantees that the line is correct. 2) Start or restart xinet 3) Test that the setup work using telnet telnet localhost 1234 If you see the SMTP server prompt you are done. Type quit<enter> to drop the connection. If you don't see the SMTP server prompt or see an error message make sure that you edited the file correctly and check your logs. Avi Per Jessen wrote:

Avi Schwartz wrote:

...

I am looking for a program that will monitor a configurable local port and when an attempt is made to access that port, it will start SSH to tunnel to a remote server and forward this port through the tunnel. I know I can use SSH to do this tunneling but I would like to find a program which will bring up that tunnel on demand.

I think xinetd is what you're looking for. -- Avi Schwartz http://public.xdi.org/=avi.schwartz

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