#!/bin/sh
#
# Network hotplug policy agent for Linux 2.4 kernels
#
# Kernel NET hotplug params include:
#	
#	ACTION=%s [register or unregister]
#	INTERFACE=%s
#
# HISTORY:
#
# 25-Feb-2001	Special case ppp and similar (redhat)
# 23-Jan-2001	Log invocation of "ifup" if debugging
# 04-Jan-2001	Initial version of "new" hotplug agent.
#
# $Id: net.agent,v 1.18 2004/03/29 22:23:31 kroah Exp $
#

# Debian-specific note:
# NET_AGENT_POLICY (in /etc/default/hotplug)
#  all - ALL network interfaces will be ifupped
#  auto - only network interfaces marked as "auto" in /etc/network/interfaces
#        will be ifupped.
#  hotplug - hotplug brings up network interfaces with '=hotplug', so
#        you need "mapping hotplug" stanzas in /etc/network/interfaces.
# See /usr/share/doc/hotplug/README.Debian for more details.
#

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

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

if [ "$NET_AGENT_POLICY" = "hotplug" ]; then
    LIFACE='=hotplug'
fi

case $ACTION in
add|register)
    case $INTERFACE in
	# interfaces that are registered after being "up" (?)
	ppp*|ippp*|isdn*|plip*|lo*|irda*|dummy*|ipsec*|tun*|tap*)
	    debug_mesg assuming $INTERFACE is already up
	    exit 0
	    ;;
	# interfaces that are registered then brought up
	*)
	    # Run ifrename as needed - Jean II
	    # Remap interface names based on MAC address. This workaround
	    # the dreaded configuration problem "all my cards are 'eth0'"...
	    # This needs to be done before ifup otherwise ifup will get
	    # confused by the name changed and because iface need to be
	    # down to change its name.
	    if [ -x /sbin/ifrename ] && [ -r /etc/iftab ]; then
		debug_mesg invoke ifrename for $INTERFACE
		NEWNAME=`/sbin/ifrename -i $INTERFACE`
		if [ -n "$NEWNAME" ]; then
		    debug_mesg iface $INTERFACE is remapped to $NEWNAME
		    INTERFACE=$NEWNAME
		fi;
	    fi

	    if [ -x /sbin/ifup ]; then
              if grep -q "^auto[[:space:]].*${INTERFACE}" /etc/network/interfaces; then
		# this $INTERFACE is marked as 'auto'
		autoif=true
	      elif grep -q "^allow-hotplug[[:space:]].*${INTERFACE}" /etc/network/interfaces; then
		# this $INTERFACE is marked as class hotplug
		hotplugif=true
	      fi
	      if grep -q "^iface[[:space:]]*${INTERFACE}[[:space:]]*inet[[:space:]]*static" /etc/network/interfaces; then
		# this $INTERFACE has static IP configuration
		staticif=true
	      fi
	      if [ "${hotplugif}" = "true" -a "${staticif}" != "true" ]; then
	        if [ -x /sbin/netplugd ]; then
	          debug_mesg "iface $INTERFACE will be configured when link is active"
		  ifconfig ${INTERFACE} 0.0.0.0 up
	          start-stop-daemon --start --background \
	            --pidfile /var/run/netplugd.${INTERFACE} \
	            --exec /sbin/netplugd -- -i ${INTERFACE} -p /var/run/netplugd.${INTERFACE}
	        else
	          mesg "E: /sbin/netplugd not found. You need to install netplugd."
	        fi
	        exit 0
	      elif [ "${hotplugif}" = "true" -a "${staticif}" = "true" ]; then
	        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
	      elif [ "${NET_AGENT_POLICY}" = "auto" -a "${autoif}" = "true" ]; then
                IFUPARG="$INTERFACE"
                if [ "$autoif" = "true" ]; then
                  IFUPARG='\('$INTERFACE'\|-a\|--all\)'
                fi
	        if ps -C ifup ho args | grep -q "$IFUPARG"; then
	          debug_mesg "Already ifup-ing that interface"
	        else
	          start-stop-daemon --start --background \
	            --pidfile /var/run/hotplug.net.ifup.bogus \
		    --startas /etc/hotplug/net.ifup -- "$INTERFACE$LIFACE"
		fi
		exit 0
	      fi
	    else
		mesg "E: /sbin/ifup not found. You need to install the ifupdown package."
	    fi
	    ;;
    esac
    mesg $1 $ACTION event not handled
    ;;

remove|unregister)
    # the pppd persist option may have been used, so it should not be killed
    case $INTERFACE in
    ppp[0-9]*)
	exit 0
	;;
    esac
    # Run ifdown because it is not going to remove the data from the
    # ifstate database otherwise.
    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 $INTERFACE"
	    ifdown "$INTERFACE"
	fi
	exit 0
    else
	mesg "E: /sbin/ifdown not found. You need to install the ifupdown package"
    fi
    mesg "$1 $ACTION event not handled"
    ;;

*)
    debug_mesg NET $ACTION event not supported
    exit 1 ;;

esac