#!/bin/sh
# Network Link hotplug agent for use with netplugd
#       requiring the netlink daemon from http://www.red-bean.com/~bos/
#       installed and configured like described in Linux-Magazin 09/2006
#
# netlinkd hotplug params include:
#	ACTION=%s [add or remove]
#	INTERFACE=%s
#
# HISTORY:
#
# 17-Jul-2006	Initial version of this hotplug agent.

cd /etc/hotplug
. ./hotplug.functions
# DEBUG=yes export DEBUG

if [ "${INTERFACE}" = "" ]; then
  mesg Bad NET_LINK invocation: \$INTERFACE is not set
  exit 1
fi

case $ACTION in
add|register)
  if [ -x /sbin/ifup ]; then
    if grep -q "^allow-hotplug[[:space:]].*${INTERFACE}" /etc/network/interfaces; then
      # this $INTERFACE is marked as class hotplug
      if ps -C ifup ho args | grep -q "$INTERFACE"; then
        debug_mesg "Already ifup-ing that interface"
      else
        start-stop-daemon --start --background \
          --pidfile /var/run/hotplug.net.ifup.bogus \
          --startas /etc/hotplug/net.ifup -- "$INTERFACE"
      fi
      exit 0
    fi
  else
    mesg "E: /sbin/ifup not found. You need to install the ifupdown package."
  fi
  ;;
remove|unregister)
  if [ -x /sbin/ifdown ]; then
    if ps -C ifdown ho args | grep -q $INTERFACE; then
      debug_mesg "Already ifdown-ing interface $INTERFACE"
    elif [ ! -e /etc/hotplug/.run/net.enable ]; then
      debug_mesg "The net.enable flag does not exist, $INTERFACE not removed"
    else
      debug_mesg "Invoking ifdown $INTERFACE"
      if [ -e /var/run/netplugd.${INTERFACE} ]; then
        kill `cat /var/run/netplugd.${INTERFACE}`
      fi
      ifdown "${INTERFACE}"
      ifconfig ${INTERFACE} 0.0.0.0 up
      start-stop-daemon --start --background \
        --pidfile /var/run/netplugd.${INTERFACE} \
        --exec /sbin/netplugd -- -i ${INTERFACE} -p /var/run/netplug
    fi
    exit 0
  else
    mesg "E: /sbin/ifdown not found. You need to install the ifupdown package"
  fi
  ;;
*)
  debug_mesg NET_LINK $ACTION event not supported
  exit 1
  ;;
esac