#!/bin/sh make_resolv_conf() { if [ "x$new_domain_name" != x ] && [ x"$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 (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 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) for i in $(seq 1 ${dad_wait_time}); do sleep 1 # give the DAD some time addr=$(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 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 $alias_subnet_mask" fi if [ x$new_interface_mtu != x ]; then mtu_arg="mtu $new_interface_mtu" fi if [ x$IF_METRIC != x ]; then metric_arg="metric $IF_METRIC" fi if [ x$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 $2 shift; shift done fi arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d \1/p' |sh fi if [ x$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 $mtu_arg $metric_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 $2 shift; shift done fi else # we haven't changed the address, have we changed other options # that we wish to update? if [ x$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 $2 shift; shift done fi arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d \1/p' \ |sh >/dev/null 2>&1 fi if [ x$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 $mtu_arg $metric_arg $medium" sleep 1 if [ "$new_routers" != "" ]; then set $new_routers if ping -q -c 1 -w 1 $1; then if [ x$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 $1 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 $2 shift; shift done fi arp -n -a | sed -n -e 's/^.*(\(.*\)) at .*$/arp -n -d \1/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 for i in $(seq 0 ${interface_up_wait_time}) do ifconfig ${interface} | grep inactive >/dev/null 2>&1 if [ $? -ne 0 ]; then break; fi sleep 1 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. for i in $(seq 0 $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 [ $? -ne 0 ]; then break; fi done fi fi exit_with_hooks 0 fi if [ x${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