--- dhcp-3.1.0a3/client/scripts/linux.orig	2006-07-22 04:24:16.000000000 +0200
+++ dhcp-3.1.0a3/client/scripts/linux	2007-04-16 17:25:06.000000000 +0200
@@ -1,208 +1,227 @@
-#!/bin/bash
+#!/bin/sh
 # dhclient-script for Linux. Dan Halbert, March, 1997.
 # Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
-# No guarantees about this. I'm a novice at the details of Linux
-# networking.
 
 # Notes:
 
 # 0. This script is based on the netbsd script supplied with dhcp-970306.
 
-# 1. ifconfig down apparently deletes all relevant routes and flushes
-# the arp cache, so this doesn't need to be done explicitly.
+# 1. This script was modified to work with iproute2
 
-# 2. The alias address handling here has not been tested AT ALL.
-# I'm just going by the doc of modern Linux ip aliasing, which uses
-# notations like eth0:0, eth0:1, for each alias.
-
-# 3. I have to calculate the network address, and calculate the broadcast
-# address if it is not supplied. This might be much more easily done
-# by the dhclient C code, and passed on.
-
-# 4. TIMEOUT not tested. ping has a flag I don't know, and I'm suspicious
-# of the $1 in its args.
+calc_prefix()
+{
+	local old_IFS=$IFS
+	IFS='.'
+	local netmask=$(echo $1)
+	IFS=$old_IFS
+
+	local ret=0
+	local endp=0
+	for n in $netmask ; do
+		for i in 128 64 32 16 8 4 2 1 ; do
+			if [ $(($n & $i)) -ne 0 ]; then
+				if [ $endp -eq 0 ]; then
+					ret=$(($ret + 1))
+				else
+					echo "32"
+					return
+				fi
+			else
+				endp=1
+			fi
+		done
+	done
+	echo $ret
+}
 
 make_resolv_conf() {
-  if [ x"$new_domain_name_servers" != x ]; then
-    cat /dev/null > /etc/resolv.conf.dhclient
-    chmod 644 /etc/resolv.conf.dhclient
-    if [ x"$new_domain_search" != x ]; then
-      echo search $new_domain_search >> /etc/resolv.conf.dhclient
-    elif [ x"$new_domain_name" != x ]; then
-      # Note that the DHCP 'Domain Name Option' is really just a domain
-      # name, and that this practice of using the domain name option as
-      # a search path is both nonstandard and deprecated.
-      echo search $new_domain_name >> /etc/resolv.conf.dhclient
-    fi
-    for nameserver in $new_domain_name_servers; do
-      echo nameserver $nameserver >>/etc/resolv.conf.dhclient
-    done
-
-    mv /etc/resolv.conf.dhclient /etc/resolv.conf
-  fi
+	if [ -n "$new_domain_name_servers" ]; then
+		:> /etc/resolv.conf.dhclient
+		chmod 644 /etc/resolv.conf.dhclient
+		if [ -n "$new_domain_search" ]; then
+			echo search $new_domain_search >> /etc/resolv.conf.dhclient
+		elif [ -n "$new_domain_name" ]; then
+			# Note that the DHCP 'Domain Name Option' is really just a domain
+			# name, and that this practice of using the domain name option as
+			# a search path is both nonstandard and deprecated.
+			echo search $new_domain_name >> /etc/resolv.conf.dhclient
+		fi
+		for nameserver in $new_domain_name_servers; do
+			echo nameserver $nameserver >>/etc/resolv.conf.dhclient
+		done
+		mv /etc/resolv.conf.dhclient /etc/resolv.conf
+	fi
 }
 
-# Must be used on exit.   Invokes the local dhcp client exit hooks, if any.
+# Must be used on exit.
+# Invokes the local dhcp client exit hooks, if any.
 exit_with_hooks() {
-  exit_status=$1
-  if [ -f /etc/dhclient-exit-hooks ]; then
-    . /etc/dhclient-exit-hooks
-  fi
-# probably should do something with exit status of the local script
-  exit $exit_status
+	exit_status=$1
+	if [ -f /etc/dhclient-exit-hooks ]; then
+		. /etc/dhclient-exit-hooks
+	fi
+	# probably should do something with exit status of the local script
+	exit $exit_status
 }
 
 # Invoke the local dhcp client enter hooks, if they exist.
 if [ -f /etc/dhclient-enter-hooks ]; then
-  exit_status=0
-  . /etc/dhclient-enter-hooks
-  # allow the local script to abort processing of this state
-  # local script must set exit_status variable to nonzero.
-  if [ $exit_status -ne 0 ]; then
-    exit $exit_status
-  fi
-fi
-
-release=`uname -r`
-release=`expr $release : '\(.*\)\..*'`
-relminor=`echo $release |sed -e 's/[0-9]*\.\([0-9][0-9]*\)\(\..*\)*$/\1/'`
-relmajor=`echo $release |sed -e 's/\([0-9][0-9]*\)\..*$/\1/'`
-
-if [ x$new_broadcast_address != x ]; then
-  new_broadcast_arg="broadcast $new_broadcast_address"
-fi
-if [ x$old_broadcast_address != x ]; then
-  old_broadcast_arg="broadcast $old_broadcast_address"
-fi
-if [ x$new_subnet_mask != x ]; then
-  new_subnet_arg="netmask $new_subnet_mask"
-fi
-if [ x$old_subnet_mask != x ]; then
-  old_subnet_arg="netmask $old_subnet_mask"
-fi
-if [ x$alias_subnet_mask != x ]; then
-  alias_subnet_arg="netmask $alias_subnet_mask"
-fi
-
-if [ x$reason = xMEDIUM ]; then
-  # Linux doesn't do mediums (ok, ok, media).
-  exit_with_hooks 0
-fi
-
-if [ x$reason = xPREINIT ]; then
-  if [ x$alias_ip_address != x ]; then
-    # Bring down alias interface. Its routes will disappear too.
-    ifconfig $interface:0- inet 0
-  fi
-  if [ $relmajor -lt 2 ] || ( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] )
-   then
-    ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
-		broadcast 255.255.255.255 up
-    # Add route to make broadcast work. Do not omit netmask.
-    route add default dev $interface netmask 0.0.0.0
-  else
-    ifconfig $interface 0 up
-  fi
-
-  # We need to give the kernel some time to get the interface up.
-  sleep 1
-
-  exit_with_hooks 0
-fi
-
-if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
-  exit_with_hooks 0
-fi
-  
-if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
-   [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
-  current_hostname=`hostname`
-  if [ x$current_hostname = x ] || \
-     [ x$current_hostname = x$old_host_name ]; then
-    if [ x$current_hostname = x ] || \
-       [ x$new_host_name != x$old_host_name ]; then
-      hostname $new_host_name
-    fi
-  fi
-    
-  if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
-		[ x$alias_ip_address != x$old_ip_address ]; then
-    # Possible new alias. Remove old alias.
-    ifconfig $interface:0- inet 0
-  fi
-  if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then
-    # IP address changed. Bringing down the interface will delete all routes,
-    # and clear the ARP cache.
-    ifconfig $interface inet 0 down
-
-  fi
-  if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
-     [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
-
-    ifconfig $interface inet $new_ip_address $new_subnet_arg \
-							$new_broadcast_arg
-    # Add a network route to the computed network address.
-    if [ $relmajor -lt 2 ] || \
-		( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] ); then
-      route add -net $new_network_number $new_subnet_arg dev $interface
-    fi
-    for router in $new_routers; do
-      route add default gw $router
-    done
-  fi
-  if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
-   then
-    ifconfig $interface:0- inet 0
-    ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
-    route add -host $alias_ip_address $interface:0
-  fi
-  make_resolv_conf
-  exit_with_hooks 0
-fi
-
-if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
-   || [ x$reason = xSTOP ]; then
-  if [ x$alias_ip_address != x ]; then
-    # Turn off alias interface.
-    ifconfig $interface:0- inet 0
-  fi
-  if [ x$old_ip_address != x ]; then
-    # Shut down interface, which will delete routes and clear arp cache.
-    ifconfig $interface inet 0 down
-  fi
-  if [ x$alias_ip_address != x ]; then
-    ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
-    route add -host $alias_ip_address $interface:0
-  fi
-  exit_with_hooks 0
-fi
-
-if [ x$reason = xTIMEOUT ]; then
-  if [ x$alias_ip_address != x ]; then
-    ifconfig $interface:0- inet 0
-  fi
-  ifconfig $interface inet $new_ip_address $new_subnet_arg \
-					$new_broadcast_arg
-  set $new_routers
-  ############## what is -w in ping?
-  if ping -q -c 1 $1; then
-    if [ x$new_ip_address != x$alias_ip_address ] && \
-			[ x$alias_ip_address != x ]; then
-      ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
-      route add -host $alias_ip_address dev $interface:0
-    fi
-    if [ $relmajor -lt 2 ] || \
-		( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] ); then
-      route add -net $new_network_number
-    fi
-    for router in $new_routers; do
-      route add default gw $router
-    done
-    make_resolv_conf
-    exit_with_hooks 0
-  fi
-  ifconfig $interface inet 0 down
-  exit_with_hooks 1
-fi
+	exit_status=0
+	. /etc/dhclient-enter-hooks
+	# allow the local script to abort processing of this state
+	# local script must set exit_status variable to nonzero.
+	if [ $exit_status -ne 0 ]; then
+		exit $exit_status
+	fi
+fi
+
+if [ -n "$new_broadcast_address" ]; then
+	new_broadcast_arg="broadcast $new_broadcast_address"
+fi
+if [ -n "$old_broadcast_address" ]; then
+	old_broadcast_arg="broadcast $old_broadcast_address"
+fi
+if [ -n "$new_subnet_mask" ]; then
+	new_subnet_arg="$(calc_prefix $new_subnet_mask)"
+fi
+if [ -n "$old_subnet_mask" ]; then
+	old_subnet_arg="$(calc_prefix $old_subnet_mask)"
+fi
+if [ -n "$alias_subnet_mask" ]; then
+	alias_subnet_arg="$(calc_prefix $alias_subnet_mask)"
+fi
+[ -z "new_subnet_arg" ] && $new_subnet_arg="32"
+[ -z "old_subnet_arg" ] && $old_subnet_arg="32"
+[ -z "alias_subnet_arg" ] && $alias_subnet_arg="32"
+
+case "$reason" in
+  MEDIUM)
+	# Linux doesn't do mediums (ok, ok, media).
+	;;
+
+  PREINIT)
+	if [ -n "$alias_ip_address" ]; then
+		/sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
+	fi
+	/sbin/ip link set $interface up
+
+	# We need to give the kernel some time to get the interface up.
+	sleep 1
+	;;
+
+  BOUND|RENEW|REBIND|REBOOT)
+	current_hostname=`hostname`
+	if [ -z "$current_hostname" ]; then
+		hostname $new_host_name
+	elif [ "$current_hostname" = "$old_host_name" -a \
+	       "$new_host_name" != "$old_host_name" ]; then
+		hostname $new_host_name
+	fi
+
+	if [ -n "$old_ip_address" -a -n "$alias_ip_address" -a \
+	     "$alias_ip_address" != "$old_ip_address" ]; then
+		# Possible new alias. Remove old alias.
+		/sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
+	fi
+	if [ -n "$old_ip_address" -a "$old_ip_address" != "$new_ip_address" ]; then
+		# IP address changed.
+		/sbin/ip addr del $old_ip_address/$old_subnet_arg dev $interface
+		for router in $old_routers; do
+			/sbin/ip route del default via $router
+		done
+		if [ -n "$old_static_routes" ]; then
+			set -- $old_static_routes
+			while [ $# -gt 1 ]; do
+				/sbin/ip route del $1 via $2
+				shift; shift
+			done
+		fi
+	fi
+	if [ -z "$old_ip_address" -o "$old_ip_address" != "$new_ip_address" -o \
+	     "$reason" = "BOUND" -o "$reason" = "REBOOT" ]; then
+		/sbin/ip addr add $new_ip_address/$new_subnet_arg $new_broadcast_arg dev $interface
+		# Add a network route to the computed network address.
+		for router in $new_routers; do
+			/sbin/ip route add default via $router
+		done
+		if [ -n "$new_static_routes" ]; then
+			set -- $new_static_routes
+			while [ $# -gt 1 ]; do
+				/sbin/ip route add $1 via $2
+				shift; shift
+			done
+		fi
+	fi
+	if [ -n "$alias_ip_address" -a "$new_ip_address" != "$alias_ip_address" ]; then
+		/sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
+	fi
+	make_resolv_conf
+	;;
+
+  EXPIRE|FAIL|RELEASE|STOP)
+	if [ -n "$alias_ip_address" ]; then
+		# Turn off alias interface.
+		/sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
+	fi
+	if [ -n "$old_ip_address" ]; then
+		/sbin/ip addr del $old_ip_address/$old_subnet_arg dev $interface
+		for router in $old_routers; do
+			/sbin/ip route del default via $router
+		done
+		if [ -n "$old_static_routes" ]; then
+			set -- $old_static_routes
+			while [ $# -gt 1 ]; do
+				/sbin/ip route del $1 via $2
+				shift; shift
+			done
+		fi
+	fi
+	if [ -n "$alias_ip_address" ]; then
+		/sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
+	fi
+	;;
+
+  TIMEOUT)
+	if [ -n "$alias_ip_address" ]; then
+		/sbin/ip addr del $alias_ip_address/$alias_subnet_arg dev $interface
+	fi
+	/sbin/ip addr add $new_ip_address/$new_subnet_arg $new_broadcast_arg dev $interface
+
+	set $new_routers
+	if ping -q -c 1 $1; then
+		if [ "$new_ip_address" != "$alias_ip_address" ] && \
+		   [ -n "$alias_ip_address" ]; then
+			/sbin/ip addr add $alias_ip_address/$alias_subnet_arg dev $interface
+		fi
+		for router in $new_routers; do
+			/sbin/ip route add default via $router
+		done
+		if [ -n "$new_static_routes" ]; then
+			set -- $new_static_routes
+			while [ $# -gt 1 ]; do
+				/sbin/ip route add $1 via $2
+				shift; shift
+			done
+		fi
+		make_resolv_conf
+		exit_with_hooks 0
+	fi
+
+	/sbin/ip addr del $new_ip_address/$new_subnet_arg dev $interface
+	for router in $old_routers; do
+		/sbin/ip route del default via $router
+	done
+	if [ -n "$old_static_routes" ]; then
+		set -- $old_static_routes
+		while [ $# -gt 1 ]; do
+			/sbin/ip route del $1 via $2
+			shift; shift
+		done
+	fi
+	exit_with_hooks 1
+	;;
+  *)
+	;;
+esac
 
 exit_with_hooks 0