#!/bin/sh

make_resolv_conf() {
 if [ x"$new_domain_name_servers" != x ]; then
cat /dev/null > /etc/resolv.conf.dhclient
 if [ x"$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
 elif [ "x${new_dhcp6_name_servers}" != x ] ; then
cat /dev/null > /etc/resolv.conf.dhclient6
 chmod 644 /etc/resolv.conf.dhclient6

 if [ "x${new_dhcp6_domain_search}" != x ] ; then
echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6
 fi
 for nameserver in ${new_dhcp6_name_servers} ; do
 # If the nameserver has a link-local address
 # add a <zone_id> (interface name) to it.
 case $nameserver in
fe80:*) zone_id="%$interface";;
	FE80:*) zone_id="%$interface";;
	*) zone_id="";;
 esac
 echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6
 done

mv /etc/resolv.conf.dhclient6 /etc/resolv.conf
 fi
}

# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
exit_with_hooks() {
 exit_status=1ドル
 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
}

# This function was largely borrowed from dhclient-script that
# ships with Centos, authored by Jiri Popelka and David Cantrell
# of Redhat. Thanks guys.
add_ipv6_addr_with_DAD() {
 ifconfig ${interface} inet6 ${new_ip6_address}/${new_ip6_prefixlen} alias

if [ ${dad_wait_time} -le 0 ]
 then
 # if we're not waiting for DAD, assume we're good
 return 0
 fi

 # Repeatedly test whether newly added address passed
 # duplicate address detection (DAD)
 i=0
 while [ $i -lt ${dad_wait_time} ]; do
sleep 1 # give the DAD some time

 addr=$(ifconfig ${interface} \
 | grep "${new_ip6_address} prefixlen ${new_ip6_prefixlen}")

 # tentative flag == DAD is still not complete
 tentative=$(echo "${addr}" | grep tentative)
 # dadfailed flag == address is already in use somewhere else
 dadfailed=$(echo "${addr}" | grep duplicated)

 if [ -n "${dadfailed}" ] ; then
 # dad failed, remove the address
 ifconfig ${interface} inet6 ${new_ip6_address}/${new_ip6_prefixlen} -alias
 exit_with_hooks 3
 fi

 if [ -z "${tentative}" ] ; then
 if [ -n "${addr}" ]; then
 # DAD is over
 return 0
 else
 # address was auto-removed (or not added at all)
 exit_with_hooks 3
 fi
 fi
true $(( i++ ))
 done

 return 0
}

# 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

if [ x$new_network_number != x ]; then
echo New Network Number: $new_network_number
fi

if [ x$new_broadcast_address != x ]; then
echo New Broadcast Address: $new_broadcast_address
 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_netmask_arg="netmask $new_subnet_mask"
fi
if [ x$old_subnet_mask != x ]; then
old_netmask_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
eval "ifconfig $interface$medium"
 eval "ifconfig $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1
 sleep 1
 exit_with_hooks 0
fi

###
### DHCPv4 Handlers
###

if [ x$reason = xPREINIT ]; then
 if [ x$alias_ip_address != x ]; then
ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
 fi
ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
		broadcast 255.255.255.255 up
 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
ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
 fi
 if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]
 then
eval "ifconfig $interface inet -alias $old_ip_address$medium"
 route delete $old_ip_address 127.1 >/dev/null 2>&1
 for router in $old_routers; do
route delete default $router >/dev/null 2>&1
 done
 if [ "$old_static_routes" != "" ]; then
set $old_static_routes
 while [ $# -gt 1 ]; do
route delete 1ドル 2ドル
	shift; shift
done
 fi
arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d 1円/p' |sh
 fi
 if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
 [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
eval "ifconfig $interface inet $new_ip_address$new_netmask_arg\
$new_broadcast_arg$medium"
 route add $new_ip_address 127.1 >/dev/null 2>&1
 for router in $new_routers; do
route add default $router >/dev/null 2>&1
 done
 if [ "$new_static_routes" != "" ]; then
set $new_static_routes
 while [ $# -gt 1 ]; do
route add 1ドル 2ドル
	shift; shift
done
 fi
 else 
 # we haven't changed the address, have we changed other options 
 # that we wish to update?
 if [ x$new_routers != x ] && [ x$new_routers != x$old_routers ] ; then
 # if we've changed routers delete the old and add the new.
 $LOGGER "New Routers: $new_routers"
 for router in $old_routers; do
route delete default $router >/dev/null 2>&1
 done
 for router in $new_routers; do
route add default $router >/dev/null 2>&1
 done
 fi
 fi
 if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
 then
ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
 route add $alias_ip_address 127.0.0.1
 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
ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
 fi
 if [ x$old_ip_address != x ]; then
eval "ifconfig $interface inet -alias $old_ip_address$medium"
 route delete $old_ip_address 127.1 >/dev/null 2>&1
 for router in $old_routers; do
route delete default $router >/dev/null 2>&1
 done
 if [ "$old_static_routes" != "" ]; then
set $old_static_routes
 while [ $# -gt 1 ]; do
route delete 1ドル 2ドル
	shift; shift
done
 fi
arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d 1円/p' \
						|sh >/dev/null 2>&1
 fi
 if [ x$alias_ip_address != x ]; then
ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
 route add $alias_ip_address 127.0.0.1
 fi
exit_with_hooks 0
fi

if [ x$reason = xTIMEOUT ]; then
 if [ x$alias_ip_address != x ]; then
ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
 fi
eval "ifconfig $interface inet $new_ip_address$new_netmask_arg\
$new_broadcast_arg$medium"
 sleep 1
 if [ "$new_routers" != "" ]; then
set $new_routers
 if ping -q -c 1 -w 1 1ドル; then
 if [ x$new_ip_address != x$alias_ip_address ] && \
			[ x$alias_ip_address != x ]; then
ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
	route add $alias_ip_address 127.0.0.1
 fi
route add $new_ip_address 127.1 >/dev/null 2>&1
 for router in $new_routers; do
route add default $router >/dev/null 2>&1
 done
set $new_static_routes
 while [ $# -gt 1 ]; do
route add 0ドル 1ドル
	shift; shift
done
make_resolv_conf
 exit_with_hooks 0
 fi
 fi
eval "ifconfig $interface inet -alias $new_ip_address$medium"
 for router in $old_routers; do
route delete default $router >/dev/null 2>&1
 done
 if [ "$old_static_routes" != "" ]; then
set $old_static_routes
 while [ $# -gt 1 ]; do
route delete 1ドル 2ドル
 shift; shift
done
 fi
arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d 1円/p' \
							|sh >/dev/null 2>&1
 exit_with_hooks 1
fi

###
### DHCPv6 Handlers
###

if [ ${reason} = PREINIT6 ] ; then
 # Ensure interface is up.
 ifconfig ${interface} up

 # XXX: Remove any stale addresses from aborted clients.

 # We need to give the kernel some time to active interface
 interface_up_wait_time=5
 i=0
 while [ $i -lt ${interface_up_wait_time} ]; do
ifconfig ${interface} | grep inactive >/dev/null 2>&1
 if [ $? -ne 0 ]; then
break;
 fi
sleep 1
 true $(( i++ ))
 done

 # Wait for duplicate address detection for this interface if the
 # --dad-wait-time parameter has been specified and is greater than
 # zero.
 if [ ${dad_wait_time} -gt 0 ]; then
 # Check if any IPv6 address on this interface is marked as
 # tentative.
 ifconfig ${interface} | grep inet6 | grep tentative \
 >/dev/null 2>&1
 if [ $? -eq 0 ]; then
 # Wait for duplicate address detection to complete or for
 # the timeout specified as --dad-wait-time.
 i=0
 while [ $i -lt ${dad_wait_time} ]; do
 # We're going to poll for the tentative flag every second.
 sleep 1
 ifconfig ${interface} | grep inet6 | grep tentative \
 >/dev/null 2>&1
 if [ $? -ne 0 ]; then
break;
 fi
true $(( i++ ))
 done
 fi
 fi

exit_with_hooks 0
fi

if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then
echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}

 exit_with_hooks 0
fi

if [ ${reason} = BOUND6 ] ; then
 if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
exit_with_hooks 2;
 fi

 # Add address to interface, check for DAD if dad_wait_time > 0
 add_ipv6_addr_with_DAD

 # Check for nameserver options.
 make_resolv_conf

 exit_with_hooks 0
fi

if [ ${reason} = RENEW6 ] || [ ${reason} = REBIND6 ] ; then
 # Make sure nothing has moved around on us.

 # Nameservers/domains/etc.
 if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
 [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
make_resolv_conf
 fi

exit_with_hooks 0
fi

if [ ${reason} = DEPREF6 ] ; then
 if [ x${new_ip6_prefixlen} = x ] ; then
exit_with_hooks 2;
 fi

 # XXX:
 # There doesn't appear to be a way to update an addr to indicate
 # preference.

 exit_with_hooks 0
fi

if [ ${reason} = EXPIRE6 -o ${reason} = RELEASE6 -o ${reason} = STOP6 ] ; then
 if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
exit_with_hooks 2;
 fi

ifconfig ${interface} inet6 -alias ${old_ip6_address}/${old_ip6_prefixlen}

 exit_with_hooks 0
fi

exit_with_hooks 0