#!/bin/sh 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 $nameserver >>/etc/resolv.conf.dhclient done elif [ "x${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 echo nameserver ${nameserver} >> /etc/resolv.conf.dhclient6 done fi # if both v4 and v6 clients are running, concatenate results cat /etc/resolv.conf.* > /etc/resolv.conf } # 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 } # 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 $exit_status fi fi ### ### DHCPv4 Handlers ### if [ x$new_broadcast_address != x ]; then new_broadcast_arg="broadcast $new_broadcast_address" fi if [ x$new_subnet_mask != x ]; then new_subnet_arg="netmask $new_subnet_mask" fi if [ x$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- 0.0.0.0 fi ifconfig $interface 0.0.0.0 up # We need to give the kernel some time to get the interface up. sleep 1 exit_with_hooks 0 fi if [ x$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 $interface:0- 0.0.0.0 fi if [ x$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 $interface 0.0.0.0 down fi if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \ [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then ifconfig $interface $new_ip_address $new_subnet_arg \ $new_broadcast_arg for router in $new_routers; do if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then route add -host $router dev $interface fi 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- 0.0.0.0 ifconfig $interface:0 $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 $interface:0- 0.0.0.0 fi if [ x$old_ip_address != x ]; then # Shut down interface, which will delete routes and clear arp cache. ifconfig $interface 0.0.0.0 down fi if [ x$alias_ip_address != x ]; then ifconfig $interface:0 $alias_ip_address $alias_subnet_arg route add -host $alias_ip_address $interface:0 fi # remove v4 dns configuration for this interface rm /etc/resolv.conf.dhclient cat /etc/resolv.conf.* > /etc/resolv.conf exit_with_hooks 0 fi if [ x$reason = xTIMEOUT ]; then if [ x$alias_ip_address != x ]; then ifconfig $interface:0- 0.0.0.0 fi ifconfig $interface $new_ip_address $new_subnet_arg \ $new_broadcast_arg set $new_routers 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 $alias_ip_address $alias_subnet_arg route add -host $alias_ip_address dev $interface:0 fi for router in $new_routers; do if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then route add -host $router dev $interface fi route add default gw $router done make_resolv_conf exit_with_hooks 0 fi ifconfig $interface 0.0.0.0 down exit_with_hooks 1 fi ### ### DHCPv6 Handlers ### if [ x$reason = xPREINIT6 ]; then # Ensure interface is up. ifconfig ${interface} up # Remove any stale addresses from aborted clients. ip -f inet6 addr flush dev ${interface} scope global exit_with_hooks 0 fi if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix} exit_with_hooks 0 fi if [ x$reason = xBOUND6 ]; then if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then exit_with_hooks 2; fi ifconfig ${interface} add ${new_ip6_address}/${new_ip6_prefixlen} # Check for nameserver options. make_resolv_conf ### << # Set up softwire tunnel if [ x${new_dhcp6_softwire} != x ] ; then /etc/init.d/dhclient stop ifconfig ${interface} 0.0.0.0 ip -6 tunnel add tun0 mode ipip6 \ remote ${new_dhcp6_softwire} \ local ${new_ip6_address} \ dev ${interface} encaplimit none ip link set tun0 up ip route add default dev tun0 fi ### >> exit_with_hooks 0 fi if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ]; then if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then exit_with_hooks 2; fi ifconfig ${interface} add ${new_ip6_address}/${new_ip6_prefixlen} # 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 [ x$reason = xDEPREF6 ]; then if [ x${new_ip6_address} = x ] ; then exit_with_hooks 2; fi # Busybox ifconfig has no way to communicate this to the kernel, so ignore it exit_with_hooks 0 fi if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ]; then if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then exit_with_hooks 2; fi ifconfig ${interface} del ${old_ip6_address}/${old_ip6_prefixlen} # remove v6 dns configuration for this interface rm /etc/resolv.conf.dhclient6 cat /etc/resolv.conf.* > /etc/resolv.conf ### << # Tear down softwire tunnel if [ x${old_dhcp6_softwire} != x ] ; then ip link set tun0 down ip tunnel del tun0 fi ### >> exit_with_hooks 0 fi exit_with_hooks 0