examples/dhcp-client-script - maze/iproute2 - Git at Google

 #!/bin/bash
 #
 # dhclient-script for Linux.
 #
 #		This program is free software; you can redistribute it and/or
 #		modify it under the terms of the GNU General Public License
 #		as published by the Free Software Foundation; either version
 #		2 of the License, or (at your option) any later version.
 #
 # Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 #
 # Probably, I did not understand, what this funny feature as "alias"
 # means exactly. For now I suppose, that it is a static address, which
 # we should install and preserve.
 #

 exec >> /var/log/DHS.log 2>&1

 echo dhc-script $* reason=$reason
 set | grep "^\(old_\|new_\|check_\)"

 LOG () {
     echo LOG $* ;
 }

 # convert 8bit mask to length
 # arg: $1 = mask
 #
 Mask8ToLen() {
 	local l=0;

 	while [ $l -le 7 ]; do
 		if [ $[ ( 1 << $l ) + $1 ] -eq 256 ]; then
 			return	$[ 8 - $l ]
 		fi
 		l=$[ $l + 1 ]
 	done
 	return 0;
 }

 # convert inet dotted quad mask to length
 # arg: $1 = dotquad mask
 #
 MaskToLen() {
  local masklen=0
  local mask8=$1

  case $1 in
  0.0.0.0)
 	return 0;
 	;;
  255.*.0.0)
 	masklen=8
 	mask8=${mask8#255.}
 	mask8=${mask8%.0.0}
 	;;
  255.255.*.0)
 	masklen=16
 	mask8=${mask8#255.255.}
 	mask8=${mask8%.0}
 	;;
  255.255.255.*)
 	masklen=24
 	mask8=${mask8#255.255.255.}
 	;;
  *)
 	return 255
 	;;
  esac
  Mask8ToLen $mask8
  return $[ $? + $masklen ]
 }

 # calculate ABC "natural" mask
 # arg: $1 = dotquad address
 #
 ABCMask () {
  local class;

  class=${1%%.*}

  if [ "$1" = "255.255.255.255" ]; then
     echo $1
  elif [ "$1" = "0.0.0.0" ]; then
     echo $1
  elif [ $class -ge 224 ]; then
     echo 240.0.0.0
  elif [ $class -ge 192 ]; then
     echo 255.255.255.0
  elif [ $class -ge 128 ]; then
     echo 255.255.0.0
  else
     echo 255.0.0.0
  fi
 }

 # calculate ABC "natural" mask length
 # arg: $1 = dotquad address
 #
 ABCMaskLen () {
  local class;

  class=${1%%.*}

  if [ "$1" = "255.255.255.255" ]; then
     return 32
  elif [ "$1" = "0.0.0.0" ]; then
     return 0
  elif [ $class -ge 224 ]; then
     return 4;
  elif [ $class -ge 192 ]; then
     return 24;
  elif [ $class -ge 128 ]; then
     return 16;
  else
     return 8;
  fi
 }

 # Delete IP address
 # args: $1 = interface
 #       $2 = address
 #       $3 = mask
 #       $4 = broadcast
 #       $5 = label
 #
 DelINETAddr () {
   local masklen=32
   local addrid=$1

   LOG DelINETAddr $*

   if [ "$5" ]; then
     addrid=$addrid:$5
   fi
   LOG ifconfig $addrid down
   ifconfig $addrid down
 }

 # Add IP address
 # args: $1 = interface
 #       $2 = address
 #       $3 = mask
 #       $4 = broadcast
 #       $5 = label
 #
 AddINETAddr () {
   local mask_arg
   local brd_arg
   local addrid=$1

   LOG AddINETAddr $*

   if [ "$5" ]; then
     addrid=$addrid:$5
   fi
   if [ "$3" ]; then
     mask_arg="netmask $3"
   fi
   if [ "$4" ]; then
     brd_arg="broadcast $4"
   fi

   LOG ifconfig $addrid $2 $mask_arg $brd_arg up
   ifconfig $addrid $2 $mask_arg $brd_arg up
 }

 # Add default routes
 # args: $1 = routers list
 #
 AddDefaultRoutes() {
     local router

     if [ "$1" ]; then
       LOG AddDefaultRoutes $*
       for router in $1; do
         LOG route add default gw $router
         route add default gw $router
       done ;
     fi
 }

 # Delete default routes
 # args: $1 = routers list
 #
 DelDefaultRoutes() {
     local router

     if [ "$1" ]; then
       LOG DelDefaultRoutes $*

       for router in $1; do
         LOG route del default gw $router
         route del default gw $router
       done
     fi
 }

 # ping a host
 # args: $1 = dotquad address of the host
 #
 PingNode() {
     LOG PingNode $*
     if ping -q -c 1 -w 2 $1 ; then
 	return 0;
     fi
     return 1;
 }

 # Check (and add route, if alive) default routers
 # args: $1 = routers list
 # returns: 0 if at least one router is alive.
 #
 CheckRouterList() {
     local router
     local succeed=1

     LOG CheckRouterList $*

     for router in $1; do
       if PingNode $router ; then
 	succeed=0
         route add default gw $router
       fi
     done
     return $succeed
 }

 # Delete/create static routes.
 # args: $1 = operation (del/add)
 #       $2 = routes list in format "dst1 nexthop1 dst2 ..."
 #
 # BEWARE: this feature of DHCP is obsolete, because does not
 #         support subnetting.
 #
 X-StaticRouteList() {
     local op=$1
     local lst="$2"
     local masklen

     LOG X-StaticRouteList $*

     if [ "$lst" ]; then
       set $lst
       while [ $# -gt 1 ]; do
 	route $op -net $1 netmask `ABCMask "$1"` gw $2
 	shift; shift;
       done
    fi
 }

 # Create static routes.
 # arg: $1 = routes list in format "dst1 nexthop1 dst2 ..."
 #
 AddStaticRouteList() {
     LOG AddStaticRouteList $*
     X-StaticRouteList add "$1"
 }

 # Delete static routes.
 # arg: $1 = routes list in format "dst1 nexthop1 dst2 ..."
 #
 DelStaticRouteList() {
     LOG DelStaticRouteList $*
     X-StaticRouteList del "$1"
 }

 # Broadcast unsolicited ARP to update neighbours' caches.
 # args: $1 = interface
 #       $2 = address
 #
 UnsolicitedARP() {
     if [ -f /sbin/arping ]; then
 	/sbin/arping -A -c 1 -I "$1" "$2" &
 	(sleep 2 ; /sbin/arping -U -c 1 -I "$1" "$2" ) &
     fi
 }

 # Duplicate address detection.
 # args: $1 = interface
 #       $2 = test address
 # returns: 0, if DAD succeeded.
 DAD() {
   if [ -f /sbin/arping ]; then
 	/sbin/arping -c 2 -w 3 -D -I "$1" "$2"
 	return $?
   fi
   return 0
 }


 # Setup resolver.
 # args: NO
 #       domain and nameserver list are passed in global variables.
 #
 # NOTE: we try to be careful and not to break user supplied resolv.conf.
 #       The script mangles it, only if it has dhcp magic signature.
 #
 UpdateDNS() {
     local nameserver
     local idstring="#### Generated by DHCPCD"

     LOG UpdateDNS $*

     if [ "$new_domain_name" = "" -a "$new_domain_name_servers" = "" ]; then
 	return 0;
     fi

     echo $idstring > /etc/resolv.conf.dhcp
     if [ "$new_domain_name" ]; then
 	echo search $new_domain_name >> /etc/resolv.conf.dhcp
     fi
     echo options ndots:1 >> /etc/resolv.conf.dhcp

     if [ "$new_domain_name_servers" ]; then
 	for nameserver in $new_domain_name_servers; do
 	    echo nameserver $nameserver >> /etc/resolv.conf.dhcp
 	done
     else
 	echo nameserver 127.0.0.1 >> /etc/resolv.conf.dhcp
     fi

     if [ -f /etc/resolv.conf ]; then
 	if [ "`head -1 /etc/resolv.conf`" != "$idstring" ]; then
 	    return 0
 	fi
 	if [ "$old_domain_name" = "$new_domain_name" -a
 	     "$new_domain_name_servers" = "$old_domain_name_servers" ]; then
 	     return 0
 	fi
     fi
     mv /etc/resolv.conf.dhcp /etc/resolv.conf
 }

 case $reason in
 NBI)
   exit 1
   ;;

 MEDIUM)
   exit 0
   ;;

 PREINIT)
   ifconfig $interface:dhcp down
   ifconfig $interface:dhcp1 down
   if [ -d /proc/sys/net/ipv4/conf/$interface ]; then
     ifconfig $interface:dhcp 10.10.10.10 netmask 255.255.255.255
     ifconfig $interface:dhcp down
     if [ -d /proc/sys/net/ipv4/conf/$interface ]; then
 	LOG The interface $interface already configured.
     fi
   fi
   ifconfig $interface:dhcp up
   exit 0
   ;;

 ARPSEND)
   exit 0
   ;;

 ARPCHECK)
   if DAD "$interface" "$check_ip_address" ; then
     exit 0
   fi
   exit 1
   ;;

 BOUND|RENEW|REBIND|REBOOT)
   if [ "$old_ip_address" -a "$alias_ip_address" -a \
 	"$alias_ip_address" != "$old_ip_address" ]; then
     DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
   fi
   if [ "$old_ip_address" -a "$old_ip_address" != "$new_ip_address" ]; then
     DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp
     DelDefaultRoutes "$old_routers"
     DelStaticRouteList "$old_static_routes"
   fi
   if [ "$old_ip_address" = "" -o "$old_ip_address" != "$new_ip_address" -o \
        "$reason" = "BOUND" -o "$reason" = "REBOOT" ]; then
     AddINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp
     AddStaticRouteList "$new_static_routes"
     AddDefaultRoutes "$new_routers"
     UnsolicitedARP "$interface" "$new_ip_address"
   fi
   if [ "$new_ip_address" != "$alias_ip_address" -a "$alias_ip_address" ]; then
     AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
   fi
   UpdateDNS
   exit 0
   ;;

 EXPIRE|FAIL)
   if [ "$alias_ip_address" ]; then
     DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
   fi
   if [ "$old_ip_address" ]; then
     DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp
     DelDefaultRoutes "$old_routers"
     DelStaticRouteList "$old_static_routes"
   fi
   if [ "$alias_ip_address" ]; then
     AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
   fi
   exit 0
   ;;

 TIMEOUT)
   if [ "$alias_ip_address" ]; then
     DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
   fi
 # Seems, <null address> means, that no more old leases found.
 # Or does it mean bug in dhcpcd? 8) Fail for now.
   if [ "$new_ip_address" = "<null address>" ]; then
     if [ "$old_ip_address" ]; then
 	DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp
     fi
     if [ "$alias_ip_address" ]; then
         AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
     fi
     exit 1
   fi
   if DAD "$interface" "$new_ip_address" ; then
     AddINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp
     UnsolicitedARP "$interface" "$new_ip_address"
     if [ "$alias_ip_address" -a "$alias_ip_address" != "$new_ip_address" ]; then
       AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
       UnsolicitedARP "$interface" "$alias_ip_address"
     fi
     if CheckRouterList "$new_routers" ; then
 	AddStaticRouteList "$new_static_routes"
 	UpdateDNS
 	exit 0
     fi
   fi
   DelINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp
   DelDefaultRoutes "$old_routers"
   DelStaticRouteList "$old_static_routes"
   if [ "$alias_ip_address" ]; then
     AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
   fi
   exit 1
   ;;
 esac

 exit 0
	#!/bin/bash
	#
	# dhclient-script for Linux.
	#
	# This program is free software; you can redistribute it and/or
	# modify it under the terms of the GNU General Public License
	# as published by the Free Software Foundation; either version
	# 2 of the License, or (at your option) any later version.
	#
	# Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
	#
	# Probably, I did not understand, what this funny feature as "alias"
	# means exactly. For now I suppose, that it is a static address, which
	# we should install and preserve.
	#

	exec >> /var/log/DHS.log 2>&1

	echo dhc-script $* reason=$reason
	set \| grep "^\(old_\\|new_\\|check_\)"

	LOG () {
	echo LOG $* ;
	}

	# convert 8bit mask to length
	# arg: $1 = mask
	#
	Mask8ToLen() {
	local l=0;

	while [ $l -le 7 ]; do
	if [ $[ ( 1 << $l ) + $1 ] -eq 256 ]; then
	return $[ 8 - $l ]
	fi
	l=$[ $l + 1 ]
	done
	return 0;
	}

	# convert inet dotted quad mask to length
	# arg: $1 = dotquad mask
	#
	MaskToLen() {
	local masklen=0
	local mask8=$1

	case $1 in
	0.0.0.0)
	return 0;
	;;
	255.*.0.0)
	masklen=8
	mask8=${mask8#255.}
	mask8=${mask8%.0.0}
	;;
	255.255.*.0)
	masklen=16
	mask8=${mask8#255.255.}
	mask8=${mask8%.0}
	;;
	255.255.255.*)
	masklen=24
	mask8=${mask8#255.255.255.}
	;;
	*)
	return 255
	;;
	esac
	Mask8ToLen $mask8
	return $[ $? + $masklen ]
	}

	# calculate ABC "natural" mask
	# arg: $1 = dotquad address
	#
	ABCMask () {
	local class;

	class=${1%%.*}

	if [ "$1" = "255.255.255.255" ]; then
	echo $1
	elif [ "$1" = "0.0.0.0" ]; then
	echo $1
	elif [ $class -ge 224 ]; then
	echo 240.0.0.0
	elif [ $class -ge 192 ]; then
	echo 255.255.255.0
	elif [ $class -ge 128 ]; then
	echo 255.255.0.0
	else
	echo 255.0.0.0
	fi
	}

	# calculate ABC "natural" mask length
	# arg: $1 = dotquad address
	#
	ABCMaskLen () {
	local class;

	class=${1%%.*}

	if [ "$1" = "255.255.255.255" ]; then
	return 32
	elif [ "$1" = "0.0.0.0" ]; then
	return 0
	elif [ $class -ge 224 ]; then
	return 4;
	elif [ $class -ge 192 ]; then
	return 24;
	elif [ $class -ge 128 ]; then
	return 16;
	else
	return 8;
	fi
	}

	# Delete IP address
	# args: $1 = interface
	# $2 = address
	# $3 = mask
	# $4 = broadcast
	# $5 = label
	#
	DelINETAddr () {
	local masklen=32
	local addrid=$1

	LOG DelINETAddr $*

	if [ "$5" ]; then
	addrid=$addrid:$5
	fi
	LOG ifconfig $addrid down
	ifconfig $addrid down
	}

	# Add IP address
	# args: $1 = interface
	# $2 = address
	# $3 = mask
	# $4 = broadcast
	# $5 = label
	#
	AddINETAddr () {
	local mask_arg
	local brd_arg
	local addrid=$1

	LOG AddINETAddr $*

	if [ "$5" ]; then
	addrid=$addrid:$5
	fi
	if [ "$3" ]; then
	mask_arg="netmask $3"
	fi
	if [ "$4" ]; then
	brd_arg="broadcast $4"
	fi

	LOG ifconfig $addrid $2 $mask_arg $brd_arg up
	ifconfig $addrid $2 $mask_arg $brd_arg up
	}

	# Add default routes
	# args: $1 = routers list
	#
	AddDefaultRoutes() {
	local router

	if [ "$1" ]; then
	LOG AddDefaultRoutes $*
	for router in $1; do
	LOG route add default gw $router
	route add default gw $router
	done ;
	fi
	}

	# Delete default routes
	# args: $1 = routers list
	#
	DelDefaultRoutes() {
	local router

	if [ "$1" ]; then
	LOG DelDefaultRoutes $*

	for router in $1; do
	LOG route del default gw $router
	route del default gw $router
	done
	fi
	}

	# ping a host
	# args: $1 = dotquad address of the host
	#
	PingNode() {
	LOG PingNode $*
	if ping -q -c 1 -w 2 $1 ; then
	return 0;
	fi
	return 1;
	}

	# Check (and add route, if alive) default routers
	# args: $1 = routers list
	# returns: 0 if at least one router is alive.
	#
	CheckRouterList() {
	local router
	local succeed=1

	LOG CheckRouterList $*

	for router in $1; do
	if PingNode $router ; then
	succeed=0
	route add default gw $router
	fi
	done
	return $succeed
	}

	# Delete/create static routes.
	# args: $1 = operation (del/add)
	# $2 = routes list in format "dst1 nexthop1 dst2 ..."
	#
	# BEWARE: this feature of DHCP is obsolete, because does not
	# support subnetting.
	#
	X-StaticRouteList() {
	local op=$1
	local lst="$2"
	local masklen

	LOG X-StaticRouteList $*

	if [ "$lst" ]; then
	set $lst
	while [ $# -gt 1 ]; do
	route $op -net $1 netmask `ABCMask "$1"` gw $2
	shift; shift;
	done
	fi
	}

	# Create static routes.
	# arg: $1 = routes list in format "dst1 nexthop1 dst2 ..."
	#
	AddStaticRouteList() {
	LOG AddStaticRouteList $*
	X-StaticRouteList add "$1"
	}

	# Delete static routes.
	# arg: $1 = routes list in format "dst1 nexthop1 dst2 ..."
	#
	DelStaticRouteList() {
	LOG DelStaticRouteList $*
	X-StaticRouteList del "$1"
	}

	# Broadcast unsolicited ARP to update neighbours' caches.
	# args: $1 = interface
	# $2 = address
	#
	UnsolicitedARP() {
	if [ -f /sbin/arping ]; then
	/sbin/arping -A -c 1 -I "$1" "$2" &
	(sleep 2 ; /sbin/arping -U -c 1 -I "$1" "$2" ) &
	fi
	}

	# Duplicate address detection.
	# args: $1 = interface
	# $2 = test address
	# returns: 0, if DAD succeeded.
	DAD() {
	if [ -f /sbin/arping ]; then
	/sbin/arping -c 2 -w 3 -D -I "$1" "$2"
	return $?
	fi
	return 0
	}


	# Setup resolver.
	# args: NO
	# domain and nameserver list are passed in global variables.
	#
	# NOTE: we try to be careful and not to break user supplied resolv.conf.
	# The script mangles it, only if it has dhcp magic signature.
	#
	UpdateDNS() {
	local nameserver
	local idstring="#### Generated by DHCPCD"

	LOG UpdateDNS $*

	if [ "$new_domain_name" = "" -a "$new_domain_name_servers" = "" ]; then
	return 0;
	fi

	echo $idstring > /etc/resolv.conf.dhcp
	if [ "$new_domain_name" ]; then
	echo search $new_domain_name >> /etc/resolv.conf.dhcp
	fi
	echo options ndots:1 >> /etc/resolv.conf.dhcp

	if [ "$new_domain_name_servers" ]; then
	for nameserver in $new_domain_name_servers; do
	echo nameserver $nameserver >> /etc/resolv.conf.dhcp
	done
	else
	echo nameserver 127.0.0.1 >> /etc/resolv.conf.dhcp
	fi

	if [ -f /etc/resolv.conf ]; then
	if [ "`head -1 /etc/resolv.conf`" != "$idstring" ]; then
	return 0
	fi
	if [ "$old_domain_name" = "$new_domain_name" -a
	"$new_domain_name_servers" = "$old_domain_name_servers" ]; then
	return 0
	fi
	fi
	mv /etc/resolv.conf.dhcp /etc/resolv.conf
	}

	case $reason in
	NBI)
	exit 1
	;;

	MEDIUM)
	exit 0
	;;

	PREINIT)
	ifconfig $interface:dhcp down
	ifconfig $interface:dhcp1 down
	if [ -d /proc/sys/net/ipv4/conf/$interface ]; then
	ifconfig $interface:dhcp 10.10.10.10 netmask 255.255.255.255
	ifconfig $interface:dhcp down
	if [ -d /proc/sys/net/ipv4/conf/$interface ]; then
	LOG The interface $interface already configured.
	fi
	fi
	ifconfig $interface:dhcp up
	exit 0
	;;

	ARPSEND)
	exit 0
	;;

	ARPCHECK)
	if DAD "$interface" "$check_ip_address" ; then
	exit 0
	fi
	exit 1
	;;

	BOUND\|RENEW\|REBIND\|REBOOT)
	if [ "$old_ip_address" -a "$alias_ip_address" -a \
	"$alias_ip_address" != "$old_ip_address" ]; then
	DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
	fi
	if [ "$old_ip_address" -a "$old_ip_address" != "$new_ip_address" ]; then
	DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp
	DelDefaultRoutes "$old_routers"
	DelStaticRouteList "$old_static_routes"
	fi
	if [ "$old_ip_address" = "" -o "$old_ip_address" != "$new_ip_address" -o \
	"$reason" = "BOUND" -o "$reason" = "REBOOT" ]; then
	AddINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp
	AddStaticRouteList "$new_static_routes"
	AddDefaultRoutes "$new_routers"
	UnsolicitedARP "$interface" "$new_ip_address"
	fi
	if [ "$new_ip_address" != "$alias_ip_address" -a "$alias_ip_address" ]; then
	AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
	fi
	UpdateDNS
	exit 0
	;;

	EXPIRE\|FAIL)
	if [ "$alias_ip_address" ]; then
	DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
	fi
	if [ "$old_ip_address" ]; then
	DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp
	DelDefaultRoutes "$old_routers"
	DelStaticRouteList "$old_static_routes"
	fi
	if [ "$alias_ip_address" ]; then
	AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
	fi
	exit 0
	;;

	TIMEOUT)
	if [ "$alias_ip_address" ]; then
	DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
	fi
	# Seems, <null address> means, that no more old leases found.
	# Or does it mean bug in dhcpcd? 8) Fail for now.
	if [ "$new_ip_address" = "<null address>" ]; then
	if [ "$old_ip_address" ]; then
	DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp
	fi
	if [ "$alias_ip_address" ]; then
	AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
	fi
	exit 1
	fi
	if DAD "$interface" "$new_ip_address" ; then
	AddINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp
	UnsolicitedARP "$interface" "$new_ip_address"
	if [ "$alias_ip_address" -a "$alias_ip_address" != "$new_ip_address" ]; then
	AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
	UnsolicitedARP "$interface" "$alias_ip_address"
	fi
	if CheckRouterList "$new_routers" ; then
	AddStaticRouteList "$new_static_routes"
	UpdateDNS
	exit 0
	fi
	fi
	DelINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp
	DelDefaultRoutes "$old_routers"
	DelStaticRouteList "$old_static_routes"
	if [ "$alias_ip_address" ]; then
	AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1
	fi
	exit 1
	;;
	esac

	exit 0