Setup dynamic SSH tunnels
TL;dr; Fix one glaring shortcoming of SSH, automatically find a free port for tunnel use.
Usage:
%./TunnelSetup
Tunnel Setup
-c="tunnels.cfg": Tunnel config setup file
-e="help": Execute command: help|attach|detatch|config|forward <local port:ip:remote port>|remote <remote port:ip:local port>
%./TunnelSetup -s -e attach
Tunnel Setup
bjorn@10.0.1.136's password:
Server 10.0.1.136 is now attached
%./TunnelSetup -s -e forward 10022:10.0.1.136:22
Tunnel Setup
Forward tunnel 10022:10.0.1.136:22 active
%./TunnelSetup -s -e remote 10022:10.0.1.4:22
Tunnel Setup
Remote tunnel 10022:10.0.1.4:22 active
%./TunnelSetup.go -s -e autoforward 127.0.0.1:80
Tunnel Setup
Forward tunnel 10000:127.0.0.1:80 active
%./TunnelSetup -s -e config
Tunnel Setup
Configuration:
Instance: 0
Server: 10.0.1.136:10080
SOCKS server on localhost port 10080
Attached to Proxy 10.0.1.136
Tunnels:
Forward 10022:10.0.1.136:22
Remote 10022:10.0.1.4:22
Forward 10000:127.0.0.1:80
%./TunnelSetup -e detach
Tunnel Setup
Stop listening request sent.
Server 10.0.1.136 is now detached
FAQ:
Where can I find a later version of ssh for ancient SuSE (e.g. Version 11p2) so it handles multiplexed forward?
You download it from here: http://download.opensuse.org/repositories/home:/H4T:/branches:/network/SLE_11_SP2/x86_64/openssh-6.2p2-68.1.x86_64.rpm
Then you run
rpm2cpio openssh-6.2p2-68.1.x86_64.rpm | cpio -idmv
In tunnels.cfg you set ssh parameter to the full path to the ssh binary you have extracted.