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@@ -0,0 +1,439 @@
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+#!/bin/sh
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+
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+# dhclient-script for Linux. Dan Halbert, March, 1997.
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+# Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
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+# Modified for Debian. Matt Zimmerman and Eloy Paris, December 2003
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+# Modified to remove useless tests for antiquated kernel versions that
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+# this doesn't even work with anyway, and introduces a dependency on /usr
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+# being mounted, which causes cosmetic errors on hosts that NFS mount /usr
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+# Andrew Pollock, February 2005
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+# Modified to work on point-to-point links. Andrew Pollock, June 2005
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+# Modified to support passing the parameters called with to the hooks. Andrew Pollock, November 2005
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+
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+# The alias handling in here probably still sucks. -mdz
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+
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+# wait for given file to be writable
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+wait_for_rw() {
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+ local file=$1
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+ # Find out whether we are going to mount / rw
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+ exec 9>&0 </etc/fstab
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+ rootmode=rw
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+ while read dev mnt type opts dump pass junk; do
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+ [ "$mnt" != / ] && continue
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+ case "$opts" in
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+ ro|ro,*|*,ro|*,ro,*)
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+ rootmode=ro
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+ ;;
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+ esac
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+ done
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+ exec 0>&9 9>&-
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+
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+ # Wait for $file to become writable
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+ if [ "$rootmode" = "rw" ]; then
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+ while ! { : >> "$file"; } 2>/dev/null; do
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+ sleep 0.1
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+ done
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+ fi
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+}
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+
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+# update /etc/resolv.conf based on received values
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+make_resolv_conf() {
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+ local new_resolv_conf
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+
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+ # DHCPv4
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+ if [ -n "$new_domain_search" ] || [ -n "$new_domain_name" ] ||
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+ [ -n "$new_domain_name_servers" ]; then
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+ resolv_conf=$(readlink -f "/etc/resolv.conf" 2>/dev/null) ||
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+ resolv_conf="/etc/resolv.conf"
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+
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+ new_resolv_conf="${resolv_conf}.dhclient-new.$$"
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+ wait_for_rw "$new_resolv_conf"
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+ rm -f $new_resolv_conf
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+
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+ if [ -n "$new_domain_name" ]; then
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+ echo domain ${new_domain_name%% *} >>$new_resolv_conf
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+ fi
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+
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+ if [ -n "$new_domain_search" ]; then
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+ if [ -n "$new_domain_name" ]; then
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+ domain_in_search_list=""
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+ for domain in $new_domain_search; do
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+ if [ "$domain" = "${new_domain_name}" ] ||
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+ [ "$domain" = "${new_domain_name}." ]; then
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+ domain_in_search_list="Yes"
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+ fi
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+ done
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+ if [ -z "$domain_in_search_list" ]; then
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+ new_domain_search="$new_domain_name $new_domain_search"
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+ fi
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+ fi
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+ echo "search ${new_domain_search}" >> $new_resolv_conf
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+ elif [ -n "$new_domain_name" ]; then
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+ echo "search ${new_domain_name}" >> $new_resolv_conf
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+ fi
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+
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+ if [ -n "$new_domain_name_servers" ]; then
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+ for nameserver in $new_domain_name_servers; do
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+ echo nameserver $nameserver >>$new_resolv_conf
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+ done
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+ else # keep 'old' nameservers
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+ sed -n /^\w*[Nn][Aa][Mm][Ee][Ss][Ee][Rr][Vv][Ee][Rr]/p $resolv_conf >>$new_resolv_conf
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+ fi
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+
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+ if [ -f $resolv_conf ]; then
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+ chown --reference=$resolv_conf $new_resolv_conf
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+ chmod --reference=$resolv_conf $new_resolv_conf
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+ fi
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+ mv -f $new_resolv_conf $resolv_conf
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+ # DHCPv6
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+ elif [ -n "$new_dhcp6_domain_search" ] || [ -n "$new_dhcp6_name_servers" ]; then
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+ resolv_conf=$(readlink -f "/etc/resolv.conf" 2>/dev/null) ||
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+ resolv_conf="/etc/resolv.conf"
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+
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+ new_resolv_conf="${resolv_conf}.dhclient-new.$$"
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+ wait_for_rw "$new_resolv_conf"
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+ rm -f $new_resolv_conf
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+
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+ if [ -n "$new_dhcp6_domain_search" ]; then
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+ echo "search ${new_dhcp6_domain_search}" >> $new_resolv_conf
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+ fi
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+
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+ if [ -n "$new_dhcp6_name_servers" ]; then
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+ for nameserver in $new_dhcp6_name_servers; do
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+ # append %interface to link-local-address nameservers
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+ if [ "${nameserver##fe80::}" != "$nameserver" ] ||
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+ [ "${nameserver##FE80::}" != "$nameserver" ]; then
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+ nameserver="${nameserver}%${interface}"
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+ fi
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+ echo nameserver $nameserver >>$new_resolv_conf
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+ done
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+ else # keep 'old' nameservers
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+ sed -n /^\w*[Nn][Aa][Mm][Ee][Ss][Ee][Rr][Vv][Ee][Rr]/p $resolv_conf >>$new_resolv_conf
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+ fi
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+
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+ if [ -f $resolv_conf ]; then
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+ chown --reference=$resolv_conf $new_resolv_conf
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+ chmod --reference=$resolv_conf $new_resolv_conf
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+ fi
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+ mv -f $new_resolv_conf $resolv_conf
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+ fi
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+}
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+
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+# set host name
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+set_hostname() {
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+ if [ -n "$new_host_name" ]; then
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+ local current_hostname=$(hostname)
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+
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+ # current host name is empty, '(none)' or 'localhost' or differs from new one from DHCP
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+ if [ -z "$current_hostname" ] ||
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+ [ "$current_hostname" = '(none)' ] ||
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+ [ "$current_hostname" = 'localhost' ] ||
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+ [ "$current_hostname" = "$old_host_name" ]; then
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+ if [ "$new_host_name" != "$current_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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+ fi
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+}
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+
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+# run given script
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+run_hook() {
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+ local script="$1"
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+ local exit_status=0
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+
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+ if [ -f $script ]; then
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+ . $script
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+ exit_status=$?
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+ fi
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+
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+ if [ -n "$exit_status" ] && [ "$exit_status" -ne 0 ]; then
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+ logger -p daemon.err "$script returned non-zero exit status $exit_status"
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+ fi
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+
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+ return $exit_status
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+}
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+
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+# run scripts in given directory
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+run_hookdir() {
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+ local dir="$1"
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+ local exit_status=0
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+
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+ if [ -d "$dir" ]; then
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+ for script in $(run-parts --list $dir); do
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+ run_hook $script
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+ exit_status=$((exit_status|$?))
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+ done
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+ fi
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+
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+ return $exit_status
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+}
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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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+ local exit_status=$1
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+
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+ # Source the documented exit-hook script, if it exists
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+ if ! run_hook /etc/dhcp/dhclient-exit-hooks; then
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+ exit_status=$?
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+ fi
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+
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+ # Now run scripts in the Debian-specific directory.
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+ if ! run_hookdir /etc/dhcp/dhclient-exit-hooks.d; then
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+ exit_status=$?
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+ fi
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+
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+ exit $exit_status
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+}
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+
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+
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+# The 576 MTU is only used for X.25 and dialup connections
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+# where the admin wants low latency. Such a low MTU can cause
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+# problems with UDP traffic, among other things. As such,
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+# disallow MTUs from 576 and below by default, so that broken
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+# MTUs are ignored, but higher stuff is allowed (1492, 1500, etc).
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+if [ -z "$new_interface_mtu" ] || [ "$new_interface_mtu" -le 576 ]; then
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+ new_interface_mtu=''
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+fi
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+
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+
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+# The action starts here
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+
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+# Invoke the local dhcp client enter hooks, if they exist.
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+run_hook /etc/dhcp/dhclient-enter-hooks
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+run_hookdir /etc/dhcp/dhclient-enter-hooks.d
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+
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+# Execute the operation
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+case "$reason" in
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+
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+ ### DHCPv4 Handlers
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+
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+ MEDIUM|ARPCHECK|ARPSEND)
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+ # Do nothing
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+ ;;
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+ PREINIT)
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+ # The DHCP client is requesting that an interface be
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+ # configured as required in order to send packets prior to
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+ # receiving an actual address. - dhclient-script(8)
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+
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+ # ensure interface is up
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+ ip link set dev ${interface} up
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+
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+ if [ -n "$alias_ip_address" ]; then
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+ # flush alias IP from interface
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+ ip -4 addr flush dev ${interface} label ${interface}:0
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+ fi
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+
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+ ;;
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+
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+ BOUND|RENEW|REBIND|REBOOT)
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+ set_hostname
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+
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+ if [ -n "$old_ip_address" ] && [ -n "$alias_ip_address" ] &&
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+ [ "$alias_ip_address" != "$old_ip_address" ]; then
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+ # alias IP may have changed => flush it
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+ ip -4 addr flush dev ${interface} label ${interface}:0
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+ fi
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+
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+ if [ -n "$old_ip_address" ] &&
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+ [ "$old_ip_address" != "$new_ip_address" ]; then
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+ # leased IP has changed => flush it
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+ ip -4 addr flush dev ${interface} label ${interface}
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+ fi
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+
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+ if [ -z "$old_ip_address" ] ||
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+ [ "$old_ip_address" != "$new_ip_address" ] ||
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+ [ "$reason" = "BOUND" ] || [ "$reason" = "REBOOT" ]; then
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+ # new IP has been leased or leased IP changed => set it
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+ ip -4 addr add ${new_ip_address}${new_subnet_mask:+/$new_subnet_mask} \
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+ ${new_broadcast_address:+broadcast $new_broadcast_address} \
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+ ${new_dhcp_lease_time:+valid_lft $new_dhcp_lease_time} \
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+ ${new_dhcp_lease_time:+preferred_lft $new_dhcp_lease_time} \
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+ dev ${interface} label ${interface}
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+
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+ if [ -n "$new_interface_mtu" ]; then
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+ # set MTU
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+ ip link set dev ${interface} mtu ${new_interface_mtu}
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+ fi
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+
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+ # if we have $new_rfc3442_classless_static_routes then we have to
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+ # ignore $new_routers entirely
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+ if [ ! "$new_rfc3442_classless_static_routes" ]; then
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+ # set if_metric if IF_METRIC is set or there's more than one router
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+ if_metric="$IF_METRIC"
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+ if [ "${new_routers%% *}" != "${new_routers}" ]; then
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+ if_metric=${if_metric:-1}
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+ fi
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+
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+ # Is the interface part of a VRF?
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+ # inspired by https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964264
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+ vrf_table="$(ip -d link show dev ${interface} | awk '/vrf_slave/ { print $3 }')"
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+ vrf_cfg=""
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+ if [ "${vrf_table}" ]; then
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+ vrf_cfg="table ${vrf_table}"
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+ fi
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+
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+ for router in $new_routers; do
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+ if [ "$new_subnet_mask" = "255.255.255.255" ]; then
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+ # point-to-point connection => set explicit route
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+ ip -4 route add ${router} dev $interface $vrf_cfg >/dev/null 2>&1
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+ fi
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+
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+ # set default route
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+ ip -4 route add default via ${router} dev ${interface} $vrf_cfg \
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+ ${if_metric:+metric $if_metric} >/dev/null 2>&1
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+
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+ if [ -n "$if_metric" ]; then
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+ if_metric=$((if_metric+1))
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+ fi
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+ done
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+ fi
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+ else # RENEW||REBIND
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+ ip -4 addr change ${new_ip_address}${new_subnet_mask:+/$new_subnet_mask} \
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+ ${new_broadcast_address:+broadcast $new_broadcast_address} \
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+ ${new_dhcp_lease_time:+valid_lft $new_dhcp_lease_time} \
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+ ${new_dhcp_lease_time:+preferred_lft $new_dhcp_lease_time} \
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+ dev ${interface} label ${interface}
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+ fi
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+
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+ if [ -n "$alias_ip_address" ] &&
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+ [ "$new_ip_address" != "$alias_ip_address" ]; then
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+ # separate alias IP given, which may have changed
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+ # => flush it, set it & add host route to it
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+ ip -4 addr flush dev ${interface} label ${interface}:0
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+ ip -4 addr add ${alias_ip_address}${alias_subnet_mask:+/$alias_subnet_mask} \
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+ dev ${interface} label ${interface}:0
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+ ip -4 route add ${alias_ip_address} dev ${interface} >/dev/null 2>&1
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+ fi
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+
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+ # update /etc/resolv.conf
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+ make_resolv_conf
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+
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+ ;;
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+
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+ EXPIRE|FAIL|RELEASE|STOP)
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+ if [ -n "$alias_ip_address" ]; then
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+ # flush alias IP
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+ ip -4 addr flush dev ${interface} label ${interface}:0
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+ fi
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+
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+ if [ -n "$old_ip_address" ]; then
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+ # flush leased IP
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+ ip -4 addr flush dev ${interface} label ${interface}
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+ fi
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+
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+ if [ -n "$alias_ip_address" ]; then
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+ # alias IP given => set it & add host route to it
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+ ip -4 addr add ${alias_ip_address}${alias_subnet_mask:+/$alias_subnet_mask} \
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+ dev ${interface} label ${interface}:0
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+ ip -4 route add ${alias_ip_address} dev ${interface} >/dev/null 2>&1
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+ fi
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+
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+ ;;
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+
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+ TIMEOUT)
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+ if [ -n "$alias_ip_address" ]; then
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+ # flush alias IP
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+ ip -4 addr flush dev ${interface} label ${interface}:0
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+ fi
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+
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+ # set IP from recorded lease
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+ ip -4 addr add ${new_ip_address}${new_subnet_mask:+/$new_subnet_mask} \
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+ ${new_broadcast_address:+broadcast $new_broadcast_address} \
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+ ${new_dhcp_lease_time:+valid_lft $new_dhcp_lease_time} \
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+ ${new_dhcp_lease_time:+preferred_lft $new_dhcp_lease_time} \
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+ dev ${interface} label ${interface}
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+
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+ if [ -n "$new_interface_mtu" ]; then
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+ # set MTU
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+ ip link set dev ${interface} mtu ${new_interface_mtu}
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+ fi
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+
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+ # if there is no router recorded in the lease or the 1st router answers pings
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+ if [ -z "$new_routers" ] || ping -q -c 1 "${new_routers%% *}"; then
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+ # if we have $new_rfc3442_classless_static_routes then we have to
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+ # ignore $new_routers entirely
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+ if [ ! "$new_rfc3442_classless_static_routes" ]; then
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+ if [ -n "$alias_ip_address" ] &&
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+ [ "$new_ip_address" != "$alias_ip_address" ]; then
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+ # separate alias IP given => set up the alias IP & add host route to it
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+ ip -4 addr add ${alias_ip_address}${alias_subnet_mask:+/$alias_subnet_mask} \
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+ dev ${interface} label ${interface}:0
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+ ip -4 route add ${alias_ip_address} dev ${interface} >/dev/null 2>&1
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+ fi
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+
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+ # set if_metric if IF_METRIC is set or there's more than one router
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+ if_metric="$IF_METRIC"
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+ if [ "${new_routers%% *}" != "${new_routers}" ]; then
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+ if_metric=${if_metric:-1}
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+ fi
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+
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+ # set default route
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+ for router in $new_routers; do
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+ ip -4 route add default via ${router} dev ${interface} \
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+ ${if_metric:+metric $if_metric} >/dev/null 2>&1
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+
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+ if [ -n "$if_metric" ]; then
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+ if_metric=$((if_metric+1))
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+ fi
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+ done
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+ fi
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+
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|
+ # update /etc/resolv.conf
|
|
|
+ make_resolv_conf
|
|
|
+ else
|
|
|
+ # flush all IPs from interface
|
|
|
+ ip -4 addr flush dev ${interface}
|
|
|
+ exit_with_hooks 2
|
|
|
+ fi
|
|
|
+
|
|
|
+ ;;
|
|
|
+
|
|
|
+ ### DHCPv6 Handlers
|
|
|
+ # TODO handle prefix change: ?based on ${old_ip6_prefix} and ${new_ip6_prefix}?
|
|
|
+
|
|
|
+ PREINIT6)
|
|
|
+ # ensure interface is up
|
|
|
+ ip link set ${interface} up
|
|
|
+
|
|
|
+ # flush any stale global permanent IPs from interface
|
|
|
+ ip -6 addr flush dev ${interface} scope global permanent
|
|
|
+
|
|
|
+ ;;
|
|
|
+
|
|
|
+ BOUND6|RENEW6|REBIND6)
|
|
|
+ if [ "${new_ip6_address}" ]; then
|
|
|
+ # set leased IP
|
|
|
+ ip -6 addr replace ${new_ip6_address} \
|
|
|
+ dev ${interface} scope global valid_lft ${new_max_life} \
|
|
|
+ preferred_lft ${new_preferred_life}
|
|
|
+ fi
|
|
|
+
|
|
|
+ # update /etc/resolv.conf
|
|
|
+ if [ "${reason}" = BOUND6 ] ||
|
|
|
+ [ "${new_dhcp6_name_servers}" != "${old_dhcp6_name_servers}" ] ||
|
|
|
+ [ "${new_dhcp6_domain_search}" != "${old_dhcp6_domain_search}" ]; then
|
|
|
+ make_resolv_conf
|
|
|
+ fi
|
|
|
+
|
|
|
+ ;;
|
|
|
+
|
|
|
+ DEPREF6)
|
|
|
+ # set preferred lifetime of leased IP to 0
|
|
|
+ ip -6 addr change ${cur_ip6_address} \
|
|
|
+ dev ${interface} scope global preferred_lft 0
|
|
|
+
|
|
|
+ ;;
|
|
|
+
|
|
|
+ EXPIRE6|RELEASE6|STOP6)
|
|
|
+ if [ -z "${old_ip6_address}" ]; then
|
|
|
+ exit_with_hooks 2
|
|
|
+ fi
|
|
|
+
|
|
|
+ # delete leased IP
|
|
|
+ ip -6 addr del ${old_ip6_address} \
|
|
|
+ dev ${interface}
|
|
|
+
|
|
|
+ ;;
|
|
|
+esac
|
|
|
+
|
|
|
+exit_with_hooks 0
|
