Chapter 20. Running dhclient exit hooks using NetworkManager a dispatcher script

1. The interface name of the device the operation happened on.
2. The action, such as up, when the interface has been activated.

Procedure

1. Create the /etc/NetworkManager/dispatcher.d/12-dhclient-down file with the following content:

   #!/bin/bash
   # Run dhclient.exit-hooks.d scripts
   
   if [ -n "$DHCP4_DHCP_LEASE_TIME" ] ; then
     if [ "$2" = "dhcp4-change" ] || [ "$2" = "up" ] ; then
       if [ -d /etc/dhcp/dhclient-exit-hooks.d ] ; then
         for f in /etc/dhcp/dhclient-exit-hooks.d/*.sh ; do
           if [ -x "${f}" ]; then
             . "${f}"
           fi
         done
       fi
     fi
   fi

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2. Set the root user as owner of the file:

   # chown root:root /etc/NetworkManager/dispatcher.d/12-dhclient-down

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3. Set the permissions so that only the root user can execute it:

   # chmod 0700 /etc/NetworkManager/dispatcher.d/12-dhclient-down

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4. Restore the SELinux context:

   # restorecon /etc/NetworkManager/dispatcher.d/12-dhclient-down

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