285 lines
7.9 KiB
Plaintext
285 lines
7.9 KiB
Plaintext
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#!/bin/sh
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# dhclient-script from OpenWRT project
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# http://git.openwrt.org/?p=packages.git;a=blob;f=net/isc-dhcp/files/dhclient-script;h=4afebc0ad20ebac51c5baae5ed01c6713e3a0fd0;hb=HEAD
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make_resolv_conf() {
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if [ x"$new_domain_name_servers" != x ]; then
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cat /dev/null > /etc/resolv.conf.dhclient
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chmod 644 /etc/resolv.conf.dhclient
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if [ x"$new_domain_search" != x ]; then
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echo search $new_domain_search >> /etc/resolv.conf.dhclient
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elif [ x"$new_domain_name" != x ]; then
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# Note that the DHCP 'Domain Name Option' is really just a domain
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# name, and that this practice of using the domain name option as
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# a search path is both nonstandard and deprecated.
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echo search $new_domain_name >> /etc/resolv.conf.dhclient
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fi
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for nameserver in $new_domain_name_servers; do
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echo nameserver $nameserver >>/etc/resolv.conf.dhclient
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done
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elif [ "x${new_dhcp6_name_servers}" != x ] ; then
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cat /dev/null > /etc/resolv.conf.dhclient6
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chmod 644 /etc/resolv.conf.dhclient6
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if [ "x${new_dhcp6_domain_search}" != x ] ; then
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echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6
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fi
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for nameserver in ${new_dhcp6_name_servers} ; do
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echo nameserver ${nameserver} >> /etc/resolv.conf.dhclient6
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done
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fi
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# if both v4 and v6 clients are running, concatenate results
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cat /etc/resolv.conf.* > /etc/resolv.conf
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}
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# Must be used on exit. Invokes the local dhcp client exit hooks, if any.
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exit_with_hooks() {
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exit_status=$1
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if [ -f /etc/dhclient-exit-hooks ]; then
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. /etc/dhclient-exit-hooks
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fi
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# probably should do something with exit status of the local script
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exit $exit_status
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}
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# Invoke the local dhcp client enter hooks, if they exist.
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if [ -f /etc/dhclient-enter-hooks ]; then
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exit_status=0
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. /etc/dhclient-enter-hooks
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# allow the local script to abort processing of this state
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# local script must set exit_status variable to nonzero.
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if [ $exit_status -ne 0 ]; then
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exit $exit_status
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fi
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fi
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###
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### DHCPv4 Handlers
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###
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if [ x$new_broadcast_address != x ]; then
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new_broadcast_arg="broadcast $new_broadcast_address"
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fi
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if [ x$new_subnet_mask != x ]; then
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new_subnet_arg="netmask $new_subnet_mask"
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fi
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if [ x$alias_subnet_mask != x ]; then
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alias_subnet_arg="netmask $alias_subnet_mask"
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fi
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if [ x$reason = xMEDIUM ]; then
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# Linux doesn't do mediums (ok, ok, media).
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exit_with_hooks 0
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fi
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if [ x$reason = xPREINIT ]; then
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if [ x$alias_ip_address != x ]; then
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# Bring down alias interface. Its routes will disappear too.
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ifconfig $interface:0- 0.0.0.0
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fi
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ifconfig $interface 0.0.0.0 up
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# We need to give the kernel some time to get the interface up.
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sleep 1
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exit_with_hooks 0
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fi
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if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
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exit_with_hooks 0
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fi
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if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
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[ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
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current_hostname=`hostname`
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if [ x$current_hostname = x ] || \
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[ x$current_hostname = x$old_host_name ]; then
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if [ x$current_hostname = x ] || \
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[ x$new_host_name != x$old_host_name ]; then
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hostname $new_host_name
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fi
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fi
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if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
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[ x$alias_ip_address != x$old_ip_address ]; then
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# Possible new alias. Remove old alias.
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ifconfig $interface:0- 0.0.0.0
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fi
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if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then
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# IP address changed. Bringing down the interface will delete all routes,
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# and clear the ARP cache.
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ifconfig $interface 0.0.0.0 down
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fi
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if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
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[ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
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ifconfig $interface $new_ip_address $new_subnet_arg \
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$new_broadcast_arg
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for router in $new_routers; do
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if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
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route add -host $router dev $interface
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fi
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route add default gw $router
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done
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fi
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if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
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then
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ifconfig $interface:0- 0.0.0.0
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ifconfig $interface:0 $alias_ip_address $alias_subnet_arg
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route add -host $alias_ip_address $interface:0
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fi
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make_resolv_conf
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exit_with_hooks 0
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fi
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if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
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|| [ x$reason = xSTOP ]; then
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if [ x$alias_ip_address != x ]; then
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# Turn off alias interface.
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ifconfig $interface:0- 0.0.0.0
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fi
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if [ x$old_ip_address != x ]; then
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# Shut down interface, which will delete routes and clear arp cache.
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ifconfig $interface 0.0.0.0 down
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fi
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if [ x$alias_ip_address != x ]; then
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ifconfig $interface:0 $alias_ip_address $alias_subnet_arg
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route add -host $alias_ip_address $interface:0
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fi
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# remove v4 dns configuration for this interface
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rm /etc/resolv.conf.dhclient
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cat /etc/resolv.conf.* > /etc/resolv.conf
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exit_with_hooks 0
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fi
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if [ x$reason = xTIMEOUT ]; then
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if [ x$alias_ip_address != x ]; then
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ifconfig $interface:0- 0.0.0.0
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fi
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ifconfig $interface $new_ip_address $new_subnet_arg \
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$new_broadcast_arg
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set $new_routers
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if ping -q -c 1 $1; then
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if [ x$new_ip_address != x$alias_ip_address ] && \
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[ x$alias_ip_address != x ]; then
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ifconfig $interface:0 $alias_ip_address $alias_subnet_arg
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route add -host $alias_ip_address dev $interface:0
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fi
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for router in $new_routers; do
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if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
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route add -host $router dev $interface
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fi
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route add default gw $router
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done
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make_resolv_conf
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exit_with_hooks 0
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fi
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ifconfig $interface 0.0.0.0 down
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exit_with_hooks 1
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fi
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###
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### DHCPv6 Handlers
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###
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if [ x$reason = xPREINIT6 ]; then
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# Ensure interface is up.
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ifconfig ${interface} up
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# Remove any stale addresses from aborted clients.
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ip -f inet6 addr flush dev ${interface} scope global
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exit_with_hooks 0
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fi
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if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then
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echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}
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exit_with_hooks 0
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fi
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if [ x$reason = xBOUND6 ]; then
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if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
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exit_with_hooks 2;
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fi
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ifconfig ${interface} add ${new_ip6_address}/${new_ip6_prefixlen}
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# Check for nameserver options.
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make_resolv_conf
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### <<
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# Set up softwire tunnel
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if [ x${new_dhcp6_softwire} != x ] ; then
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/etc/init.d/dhclient stop
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ifconfig ${interface} 0.0.0.0
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ip -6 tunnel add tun0 mode ipip6 \
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remote ${new_dhcp6_softwire} \
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local ${new_ip6_address} \
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dev ${interface} encaplimit none
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ip link set tun0 up
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ip route add default dev tun0
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fi
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### >>
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exit_with_hooks 0
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fi
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if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ]; then
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if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
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exit_with_hooks 2;
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fi
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ifconfig ${interface} add ${new_ip6_address}/${new_ip6_prefixlen}
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# Make sure nothing has moved around on us.
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# Nameservers/domains/etc.
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if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
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[ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
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make_resolv_conf
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fi
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exit_with_hooks 0
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fi
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if [ x$reason = xDEPREF6 ]; then
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if [ x${new_ip6_address} = x ] ; then
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exit_with_hooks 2;
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fi
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# Busybox ifconfig has no way to communicate this to the kernel, so ignore it
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exit_with_hooks 0
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fi
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if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ]; then
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if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
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exit_with_hooks 2;
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fi
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ifconfig ${interface} del ${old_ip6_address}/${old_ip6_prefixlen}
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# remove v6 dns configuration for this interface
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rm /etc/resolv.conf.dhclient6
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cat /etc/resolv.conf.* > /etc/resolv.conf
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### <<
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# Tear down softwire tunnel
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if [ x${old_dhcp6_softwire} != x ] ; then
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ip link set tun0 down
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ip tunnel del tun0
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fi
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### >>
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exit_with_hooks 0
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fi
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exit_with_hooks 0
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