Did you ever wish you could start certain scripts only when you are bringing the network up and then stop them when bring the network down?
For the longest time, I was using wicd to manage network connections. At some point and time I decided to take a look at NetworkManager.
Using network manager, you can use the dispatcher to run scripts based on network connection, runlevel, etc.
This is how I got it working in gentoo linux and a few example scripts.
The following are the specific packages and versions I have installed:
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net-misc/cnetworkmanager
Latest version available: 0.21.1
Latest version installed: 0.21.1
Size of files: 28 kB
Homepage: http://vidner.net/martin/software/cnetworkmanager/
Description: Command line interface for NetworkManager.
License: GPL-2
* net-misc/networkmanager
Latest version available: 0.8.2-r10
Latest version installed: 0.8.2-r10
Size of files: 1,591 kB
Homepage: http://www.gnome.org/projects/NetworkManager/
Description: Network configuration and management in an easy way. Desktop environment independent.
License: GPL-2
* net-misc/networkmanager-openvpn
Latest version available: 0.8.2-r1
Latest version installed: 0.8.2-r1
Size of files: 394 kB
Homepage: http://www.gnome.org/projects/NetworkManager/
Description: NetworkManager OpenVPN plugin.
License: GPL-2
* net-misc/networkmanager-pptp
Latest version available: 0.8.2
Latest version installed: 0.8.2
Size of files: 375 kB
Homepage: http://www.gnome.org/projects/NetworkManager/
Description: NetworkManager PPTP plugin
License: GPL-2
* net-misc/networkmanager-vpnc
Latest version available: 0.8.2
Latest version installed: 0.8.2
Size of files: 367 kB
Homepage: http://www.gnome.org/projects/NetworkManager/
Description: NetworkManager VPNC plugin
License: GPL-2
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Along with the use flags I have compiled with:
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# emerge -pv networkmanager These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild R ] net-misc/networkmanager-0.8.2-r10 USE="avahi bluetooth connection-sharing dhcpcd gnutls nss resolvconf -dhclient -doc" 0 kB
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Once that is done, disable all net devices from loading through udev. You do that by simply adding this line to /etc/conf.d/rc
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RC_PLUG_SERVICES="!net.*"
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The next part you have to really think about. Any net related service except net.lo really needs to be under the control of network manager. So, what I did was grepped for net in /etc/init.d/* and made a list.
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# grep "use net" /etc/init.d/*
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And the list was:
/etc/init.d/avahi-daemon: use net
/etc/init.d/avahi-dnsconfd: use net
/etc/init.d/clamd: use net
/etc/init.d/cupsd: use net
/etc/init.d/lisa: use net
/etc/init.d/mrtg: # use net-snmpd
/etc/init.d/mysql: use net.lo
/etc/init.d/netperf: use net
/etc/init.d/ntpd: use net dns logger
/etc/init.d/rpcbind: use net
/etc/init.d/rsyncd: use net
/etc/init.d/staticroute: use network
/etc/init.d/xinetd: use net
So then I checked what I currently had listed in my default and battery runlevels, and removed anything that was in the list above that required net from it. This was mysql, iptables, cupsd, ntpd, sshd
I ended up with only this:
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rc-config list | grep default
sysstat default
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Then everything I removed, I created a script to be started by networkmanager.
Here are the scripts I placed in /etc/NetworkManager/dispatcher.d
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echo "ran `date +%Y%m%d`" >> /tmp/nwm-firewall
/etc/init.d/iptables status | grep -q "started"
started=$?
echo $2 >> /tmp/nwm-firewall
echo $started >> /tmp/nwm-firewall
if [[ "$2" == "up" ]] ; then
if [[ "$started" != "0" ]] ; then
rc-config start iptables
fi
else
rc-config stop iptables
fi
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[codesyntax lang=”bash” title=”49-sshd”]
echo "ran `date +%Y%m%d`" >> /tmp/nwm-sshd
/etc/init.d/sshd status | grep -q "started"
started=$?
if [[ "$2" == "up" ]] ; then
if [[ "$started" != "0" ]] ; then
rc-config start sshd
fi
else
rc-config stop sshd
fi
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[codesyntax lang=”bash” title=”50-ntpd”]
echo "ran `date +%Y%m%d`" >> /tmp/nwm-ntpd
/etc/init.d/ntpd status | grep -q "started"
started=$?
if [[ "$2" == "up" ]] ; then
if [[ "$started" != "0" ]] ; then
rc-config start ntpd
fi
else
rc-config stop ntpd
fi
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[codesyntax lang=”bash” title=”51-mysql”]
echo "ran `date +%Y%m%d`" >> /tmp/nwm-mysql
/etc/init.d/mysql status | grep -q "started"
started=$?
if [[ "$2" == "up" ]] ; then
if [[ "$started" != "0" ]] ; then
rc-config start mysql
fi
else
rc-config stop mysql
fi
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[codesyntax lang=”bash” title=”52-cups”]
echo "ran `date +%Y%m%d`" >> /tmp/nwm-cupsd
/etc/init.d/cupsd status | grep -q "started"
started=$?
if [[ "$2" == "up" ]] ; then
if [[ "$started" != "0" ]] ; then
rc-config start cupsd
fi
else
rc-config stop cupsd
fi
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One thing you will notice in the above, there is no shebang line ( #!/bin/bash ) because it is not needed. The files are owned root:root and have 700 permissions.
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dispatcher.d # ls -la total 20 drwxr-xr-x 2 root root 120 May 5 18:28 . drwxr-xr-x 5 root root 90 Apr 27 17:00 .. -rwx------ 1 root root 336 May 5 18:26 48-firewall -rwx------ 1 root root 255 May 5 18:26 49-sshd -rwx------ 1 root root 255 May 5 18:27 50-ntpd -rwx------ 1 root root 259 May 5 18:27 51-mysql -rwx------ 1 root root 259 May 5 18:28 52-cupsd
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So the numbering of the files affects the order they are started or shutdown, lower numbers get started first.
If you look inside /var/log/messages and restart /etc/init.d/NetworkManager you can see any error logs. Also, in my examples above, I echo some stuff to files inside of /tmp for diagnostics, mostly just that the script was ran and the output of the init.d status check.
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