Configuration:
Laptop with KUbuntu 6.10 running on it.

Problem:
I have a laptop with SSHD running on it. The situation is that SSHD server is only used at home and should be turned off whenever I am connected to network at work/office (security restrictions out there). So, I need somehow to let my laptop start SSHD server only whenever I am at home and connected to home network of course administrated by myself.

Solution:
One possible solution of given problem is to put simple BASH script in /etc/init.d/start_ssh.sh that would start SSHD server or not depending on currently connected NETWORK name. The only problem here is how to get that NETWORK name in BASH (Python/C++/(T)CSH)? Any Ideas?



P.S. I have found some interesting folders in /etc/network/ with names:
if-down.d
if-post-down.d
if-pre-up.d
if-up.d
Maybe as a solution start_ssh.sh script should be put there which will be executed each time network is changed? What is their purpose?

Do you get a different address when you are at work?
ifconfig eth0 | grep inet will tell you your network address.
Then you could write some bash / sed / awk / python / whatever to decide whether to start sshd or not.

Yes, I do get different IP address.

It might be as easy as:
or something similar. Where "192" is the shortest string that uniquely distinguishes your home LAN from work.

The solution is simple as usual. iwconfig will give me Access Point which is unique and can be used in order to get idea where am I working at: Home or Office.

The only problem is how to get the same information for wired connections? Sometimes I am using my cable network card. Any ideas?