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If you have ever tried correcting the MP3 tags for many tracks in your music library, you probably have grown tired of the manual process very quickly, just like me.
Continue reading MusicBrainzAutomatic reverse ssh tunnel – Linux
Purpose: start/maintain/stop a reverse ssh tunnel to an always-on ssh accessible server
Naming conventions:
middleman is the ssh server that will be used to access the client machine
middleman has IP address mm.ip.addr
cuid and mmuid are users with access rights to ssh on client and middleman respectively
On client have nmap, autossh, openssh installed
On server have openssh-server installed and runnig
On client log in as cuid:
ssh-keygen # press enter twice for empty password
cat .ssh/id_rsa.pub | ssh -l mmuid mm.ip.addr sh -c "cat – >> ~/.ssh/authorized_keys"
nano /etc/network/if-up.d/start_autossh_rev_tunnel
#!/bin/bash
#
#echo Checking for autossh…
[ -x /usr/bin/autossh ] || exit 0
#echo Checking for ssh…
[ -x /usr/bin/ssh ] || exit 0
#echo Checking for nc…
[ -x /bin/nc ] || exit 0
#echo Checking for server…
[ ! `/bin/nc -z -w 1 163.1.6.117 22` ] || exit 0
#echo Stopping any already running autossh instances.
killall -q -TERM autossh
sleep 1
#echo Starting reverse ssh tunnel.
su -l -c "/usr/bin/autossh -4 -M29002 -f -N -R 1411:localhost:22 zjl@163.1.6.117 -oLogLevel=error -oUserKnownHostsFile=/dev/null -oStrictHostKeyChecking=no" zjl || exit 0
#echo All done.
exit 0
nano /etc/network/if-up.d/stop_autossh_rev_tunnel
#!/bin/bash
#
#echo Stopping any running autossh instances.
killall -q -TERM autossh
#echo All done.
exit 0
chmod +x /etc/network/if-up.d/stop_autossh_rev_tunnel /etc/network/if-up.d/start_autossh_rev_tunnel
Links:
setting up ssh keys
http://paulkeck.com/ssh/
reverse ssh tunnel
http://www.howtoforge.com/reverse-ssh-tunneling
http://jiang925.com/content/tunnel-through-firewall-using-reverse-ssh-and-vpn-dd-wrt
autossh script to start reverse tunnel
http://forums.gentoo.org/viewtopic-t-875883.html
http://www.vdomck.org/2009/11/ssh-all-time.html
Ubuntu man page(s)
http://manpages.ubuntu.com/manpages/lucid/man5/interfaces.5.html