#!/bin/sh
-# empty dhclient-script to keep dhclient from complaining
+
+# dhclient-script from OpenWRT project
+# http://git.openwrt.org/?p=packages.git;a=blob;f=net/isc-dhcp/files/dhclient-script;h=4afebc0ad20ebac51c5baae5ed01c6713e3a0fd0;hb=HEAD
+
+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
projects / buildroot.git / commitdiff