8b16439d3f
- Removed linux.dbus-example script since we aren't using dhcdbd now - Remove dhcdbd leftovers from dhclient-script (#306381)
578 lines
18 KiB
Bash
Executable File
578 lines
18 KiB
Bash
Executable File
#!/bin/bash
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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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# No guarantees about this. I'm a novice at the details of Linux
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# networking.
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#
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# Modified by David Cantrell <dcantrell@redhat.com> for Fedora and RHEL
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# Notes:
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# 0. This script is based on the netbsd script supplied with dhcp-970306.
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# 1. ifconfig down apparently deletes all relevant routes and flushes
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# the arp cache, so this doesn't need to be done explicitly.
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# 2. The alias address handling here has not been tested AT ALL.
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# I'm just going by the doc of modern Linux ip aliasing, which uses
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# notations like eth0:0, eth0:1, for each alias.
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# 3. I have to calculate the network address, and calculate the broadcast
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# address if it is not supplied. This might be much more easily done
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# by the dhclient C code, and passed on.
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PATH=/bin:/usr/bin
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function save_previous() {
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if [ -e $1 ]; then
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mv $1 $1.predhclient
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else
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echo ''> $1.predhclient
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fi
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}
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make_resolv_conf() {
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if [ "${PEERDNS}" == "no" ]; then
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return
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fi
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if [ x$reason == xRENEW ] &&
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[ "$new_domain_name" == "$old_domain_name" ] &&
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[ "$new_domain_name_servers" == "$old_domain_name_servers" ]; then
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return
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fi
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if [ -n "$new_domain_name" ] || [ -n "$new_domain_name_servers" ]; then
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cp -fp /etc/resolv.conf /etc/resolv.conf.predhclient
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rscf=`mktemp /tmp/XXXXXX`;
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echo '; generated by /sbin/dhclient-script' > $rscf
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if [ -n "$SEARCH" ]; then
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echo search $SEARCH >> $rscf
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else
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if [ -n "$new_domain_name" ]; then
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echo search $new_domain_name >> $rscf
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fi
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fi
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for nameserver in $new_domain_name_servers; do
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echo nameserver $nameserver >> $rscf
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done
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change_resolv_conf $rscf
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rm -f $rscf
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fi
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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 $exit_status
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fi
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fi
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# Import Red Hat Linux configuration
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cd /etc/sysconfig/network-scripts;
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. /etc/sysconfig/network-scripts/network-functions
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. /etc/rc.d/init.d/functions
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[ -f ../network ] && . ../network
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[ -f ../networking/network ] && . ../networking/network
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CONFIG=$interface
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need_config ${CONFIG}
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if [ -f "${CONFIG}" ]; then
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source_config
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else
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echo $"$0: configuration for $interface not found. Continuing with defaults." >&2
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fi
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source_config
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release=$(uname -r)
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relmajor=$(echo $release | cut -f1 -d'.')
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relminor=$(echo $release | cut -f2 -d'.')
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# simple IP arithmetic functions:
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function quad2num() {
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if [ $# -eq 4 ]; then
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let n="$1<<24|$2<<16|$3<<8|$4"
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echo $n
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return 0
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fi
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echo '0'
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return 1
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}
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function ip2num() {
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IFS='.' quad2num $1
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}
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function num2ip() {
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let n="$1"
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let o1='(n>>24)&0xff'
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let o2='(n>>16)&0xff'
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let o3='(n>>8)&0xff'
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let o4='n & 0xff'
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echo $o1.$o2.$o3.$o4
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}
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function mask() {
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ip=$1
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m=$2
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let ip=$(IFS='.' ip2num $ip)
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let m=$(IFS='.' ip2num $m)
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let n='ip&m'
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num2ip $n
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}
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function mask_bits() {
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ip=$1
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let ip=$(IFS='.' ip2num $ip)
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let bits=0
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for ((bit=1; '((ip&bit)==0) && (bits < 32)'; 'bit<<=1')) do
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let bits+=1
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done
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let n_bits=32-bits
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echo $n_bits
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}
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function class_bits() {
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let ip=$(IFS='.' ip2num $1)
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let bits=32
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let mask='255'
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for ((i=0; i <= 3; i++, 'mask<<=8')); do
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let v='ip&mask'
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if [ "$v" -eq 0 ] ; then
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let bits-=8
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else
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break
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fi
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done
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echo $bits
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}
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function routerReachable() {
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# Handle silly DHCP servers that give us a router not on our subnet:
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router=$1
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routerSubnet=$(mask $router $new_subnet_mask)
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mySubnet=$(mask $new_ip_address $new_subnet_mask)
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unreachable=0
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if [ "$routerSubnet" != "$mySubnet" ]; then
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unreachable=1
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if /sbin/arping -f -q -I $interface -w2 $router; then
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/sbin/ip route add ${router}/32 dev $interface
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if [ $? -eq 0 ]; then
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unreachable=0
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else
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/usr/bin/logger -p local7.notice -t "NET" "dhclient: failed to create host route for unreachable router $router not on subnet $mySubnet";
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fi
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else
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unreachable=1
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if [ -x /usr/bin/logger ]; then
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/usr/bin/logger -p local7.notice -t "NET" "dhclient: DHCP router $router is unreachable on DHCP subnet $mySubnet router subnet $routerSubnet";
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fi
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fi
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fi
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return $unreachable
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}
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function add_default_gateway() {
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router=$1
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metric=''
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if [ $# -gt 1 ] && [ "$2" -gt 0 ]; then
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metric="metric $2"
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fi
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if routerReachable $router ; then
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/sbin/ip route replace default via $router dev $interface $metric
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if [ $? -ne 0 ]; then
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/usr/bin/logger -p local7.notice -t "NET" 'dhclient: failed to create default route: '$router dev $interface $metric
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return 1
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else
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return 0
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fi
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fi
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return 1
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}
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function dhconfig() {
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if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && [ x$alias_ip_address != x$old_ip_address ]; then
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# Possible new alias. Remove old alias.
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ifconfig $interface:0- inet 0
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fi
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if [ x$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
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# routes, and clear the ARP cache.
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ifconfig $interface inet 0 down
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fi
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if [ x$reason = xBOUND ] || [ x$reason = xREBOOT ] ||
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[ x$old_ip_address != x$new_ip_address ] ||
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[ x$old_subnet_mask != x$new_subnet_mask ] ||
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[ x$new_network_number != x$new_network_number ] ||
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[ x$old_broadcast_address != x$new_broadcast_address ] ||
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[ "x$old_routers" != "x$new_routers" ] ||
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[ x$old_interface_mtu != x$new_interface_mtu ] ; then
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ifconfig $interface inet $new_ip_address $new_subnet_arg $new_broadcast_arg
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if [ -n "$new_interface_mtu" ]; then
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/sbin/ip link set $interface mtu $new_interface_mtu
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fi
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if [ -x /etc/dhclient-${interface}-up-hooks ]; then
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. /etc/dhclient-${interface}-up-hooks
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elif [ -x /etc/dhclient-up-hooks ]; then
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. /etc/dhclient-up-hooks
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fi
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prefix_bits=$(mask_bits $new_subnet_mask)
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# Add a network route to the computed network address.
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if [ $relmajor -lt 2 ] || ( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] ); then
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/sbin/ip route replace ${new_network_number}/${prefix_bits} dev $interface
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if [ $added_old_broadcast_route -eq 1 ]; then
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/sbin/ip route del default
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fi
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fi
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if [[ (( -z "$GATEWAYDEV" ) || ( "$GATEWAYDEV" = "$interface" )) && (( -z "$GATEWAY" ) || (( -n "$DHCLIENT_IGNORE_GATEWAY" ) && ( "$DHCLIENT_IGNORE_GATEWAY" = [Yy]* ))) ]]; then
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metric=${METRIC:-''}
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let i=${METRIC:-0}
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default_routers=()
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for router in $new_routers; do
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added_router=0
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for r in ${default_routers[@]}; do
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if [ "$r" == "$router" ]; then
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added_router=1
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fi
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done
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if [ -z "$router" ] || [ "$added_router" -eq 1 ] || [ $(IFS=. ip2num $router) -le 0 ] || [[ ( "$router" = "$new_broadcast_address" ) && ( "$new_subnet_mask" != "255.255.255.255" ) ]]; then
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continue
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fi
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default_routers=(${default_routers[@]} $router)
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add_default_gateway $router $metric
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let i=i+1
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metric=$i
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done
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elif [[ (( -z "$GATEWAYDEV" ) || ( "$GATEWAYDEV" = "$interface" )) && ( -n "$GATEWAY" ) ]]; then
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routerSubnet=$(mask $GATEWAY $new_subnet_mask)
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mySubnet=$(mask $new_ip_address $new_subnet_mask)
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if [ "$routerSubnet" = "$mySubnet" ]; then
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/sbin/ip route replace default via $GATEWAY dev $interface
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fi
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fi
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# static routes
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if [ "x$new_static_routes" != x ]; then
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IFS=', ' static_routes=($new_static_routes)
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route_targets=()
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for((i=0; i<${#static_routes[@]}; i+=2)); do
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target=${static_routes[$i]}
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gateway=${static_routes[$i+1]}
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metric=''
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for t in ${route_targets[@]}; do
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if [ $t == $target ]; then
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if [ -z "$metric" ]; then
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metric=1
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else
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((metric=metric+1))
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fi
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fi
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done
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if [ -n "$metric" ]; then
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metric="metric $metric"
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fi
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if routerReachable $gateway; then
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/sbin/ip route replace ${target}/$(class_bits $target) via ${gateway} dev $interface ${metric}
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if [ $? -ne 0 ]; then
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/usr/bin/logger -p local7.notice -t 'NET' 'dhclient: failed to create static route:' ${target}/`class_bits $target` via ${gateway} dev $interface ${metric}
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else
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route_targets=(${route_targets[@]} $target)
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fi
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fi
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done
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fi
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fi
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if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ]; then
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ifconfig $interface:0- inet 0
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ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
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/sbin/ip route replace ${alias_ip_address}/32 dev $interface:0
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fi
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make_resolv_conf
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if [ -n "$new_host_name" ] && need_hostname; then
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hostname $new_host_name
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fi
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if [ "${PEERNIS}" = no ]; then
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:
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elif [ -n "$new_nis_domain" ]; then
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domainname "$new_nis_domain"
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save_previous /etc/yp.conf
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let contents=0
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echo '# generated by /sbin/dhclient-script' > /etc/yp.conf
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if [ -n "$new_nis_servers" ]; then
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for I in $new_nis_servers; do
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echo "domain $new_nis_domain server $I" >> /etc/yp.conf
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let contents=contents+1
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done
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else
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echo "domain $new_nis_domain broadcast" >> /etc/yp.conf
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let contents=contents+1
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fi
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level=$(/sbin/runlevel)
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level=${level##*\ }
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if [ "$level" = "unknown" ]; then
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level=1
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fi
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if [ $contents -gt 0 ] && [[ "$level" = [0-6] ]] && /sbin/chkconfig --level=$level ypbind >/dev/null 2>&1 && [ -r /var/run/ypbind.pid ] && yppid=$(cat /var/run/ypbind.pid) && [ -d /proc/${yppid} ] && [ "$(if [ -x /sbin/busybox ]; then /sbin/busybox readlink /proc/${yppid}/exe; else echo /sbin/ypbind; fi)" = "/sbin/ypbind" ]; then
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kill -HUP $yppid
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fi
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elif [ -n "$new_nis_servers" ]; then
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save_previous /etc/yp.conf
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echo '# generated by /sbin/dhclient-script' > /etc/yp.conf
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let contents=0
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for I in $new_nis_servers; do
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echo "ypserver $I" >> /etc/yp.conf
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let contents=contents+1
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done
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level=$(/sbin/runlevel)
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level=${level##*\ }
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if [ "$level" = "unknown" ]; then
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level=1
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fi
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if [ $contents -gt 0 ] && [[ "$level" = [0-6] ]] && /sbin/chkconfig --level=$level ypbind >/dev/null 2>&1 && [ -r /var/run/ypbind.pid ] && yppid=$(cat /var/run/ypbind.pid) && [ -d /proc/${yppid} ] && [ "$(if [ -x /sbin/busybox ]; then /sbin/busybox readlink /proc/${yppid}/exe; else echo /sbin/ypbind; fi)" = "/sbin/ypbind" ] ; then
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kill -HUP $yppid
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fi
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fi
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if [ -n "$DHCP_TIME_OFFSET_SETS_TIMEZONE" ] && [[ "$DHCP_TIME_OFFSET_SETS_TIMEZONE" = [yY1]* ]]; then
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if [ -n "$new_time_offset" ]; then
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# DHCP option "time-offset" is requested by default and should be
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# handled. The geographical zone abbreviation cannot be determined
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# from the GMT offset, but the $ZONEINFO/Etc/GMT$offset file can be
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# used - note: this disables DST.
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((z=new_time_offset/3600))
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((hoursWest=$(printf '%+d' $z)))
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if (( $hoursWest < 0 )); then
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# tzdata treats negative 'hours west' as positive 'gmtoff'!
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((hoursWest*=-1))
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fi
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tzfile=/usr/share/zoneinfo/Etc/GMT$(printf '%+d' $hoursWest)
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if [ -e $tzfile ]; then
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/bin/mv -f /etc/localtime /etc/localtime.predhclient
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/bin/cp -fp $tzfile /etc/localtime
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/bin/touch /etc/localtime
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fi
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fi
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fi
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if [ "${PEERNTP}" = no ]; then
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:
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elif [ -n "$new_ntp_servers" ] && [ -e /etc/ntp.conf ]; then
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save_previous /etc/ntp.conf
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/bin/egrep -v '^server .* # added by /sbin/dhclient-script$'< /etc/ntp.conf.predhclient > /etc/ntp.conf
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for s in $new_ntp_servers; do
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echo "server $s # added by /sbin/dhclient-script" >> /etc/ntp.conf
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done
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if [ -x /usr/bin/diff ] && /usr/bin/diff -q /etc/ntp.conf /etc/ntp.conf.predhclient >/dev/null 2>&1; then
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:
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else
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/sbin/service ntpd condrestart >/dev/null 2>&1
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fi
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fi
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}
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if [ x$new_broadcast_address != x ] && [ x$new_subnet_mask != x ] && [ "$new_subnet_mask" != "255.255.255.255" ]; then
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new_broadcast_arg="broadcast $new_broadcast_address"
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fi
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if [ x$old_broadcast_address != x ]; then
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old_broadcast_arg="broadcast $old_broadcast_address"
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fi
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if [ x$new_subnet_mask != x ]; then
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new_subnet_arg="netmask $new_subnet_mask"
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fi
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if [ x$old_subnet_mask != x ]; then
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old_subnet_arg="netmask $old_subnet_mask"
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fi
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if [ x$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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added_old_broadcast_route=0
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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 $interface:0- inet 0
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fi
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if [ x$keep_old_ip = xyes ]; then
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ifconfig $interface up
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elif [ $relmajor -lt 2 ] || ( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] ) then
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ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 broadcast 255.255.255.255 up
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# Add route to make broadcast work. Do not omit netmask.
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/sbin/ip route replace default dev $interface && added_old_broadcast_route=1
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else
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ifconfig $interface 0 up
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fi
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# We need to give the kernel some time to get the interface up.
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# sleep 1
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# I don't think this is necessary with modern kernels - no problems found
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# during testing - JVD, 2005-06-17
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# but just in case:
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if [ -n "$DHCLIENT_DELAY" ] && [ "$DHCLIENT_DELAY" -gt 0 ] ; then
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sleep $DHCLIENT_DELAY
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fi
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exit_with_hooks 0
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fi
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if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
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if [ -z "$new_ip_address" ] || [ -z "$interface" ] || /sbin/arping -q -f -c 2 -w 3 -D -I ${interface} ${new_ip_address}; then
|
|
exit_with_hooks 0
|
|
else
|
|
exit_with_hooks 1
|
|
fi
|
|
fi
|
|
|
|
if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
|
|
[ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
|
|
dhconfig
|
|
exit_with_hooks 0
|
|
fi
|
|
|
|
if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
|
|
|| [ x$reason = xSTOP ]; then
|
|
if [ -f /etc/resolv.conf.predhclient ]; then
|
|
change_resolv_conf /etc/resolv.conf.predhclient
|
|
rm -f /etc/resolv.conf.predhclient
|
|
fi
|
|
|
|
if [ -n "$DHCP_TIME_OFFSET_SETS_TIMEZONE" ] && [[ "$DHCP_TIME_OFFSET_SETS_TIMEZONE" = [yY1]* ]]; then
|
|
if [ -e /etc/localtime.predhclient ]; then
|
|
/bin/rm -f /etc/localtime
|
|
/bin/mv -f /etc/localtime.predhclient /etc/localtime
|
|
/bin/touch /etc/localtime
|
|
fi
|
|
fi
|
|
|
|
if [ -f /etc/ntp.conf.predhclient ]; then
|
|
/bin/rm -f /etc/ntp.conf
|
|
/bin/mv -f /etc/ntp.conf.predhclient /etc/ntp.conf
|
|
service ntpd condrestart >/dev/null 2>&1
|
|
fi
|
|
|
|
if [ -f /etc/yp.conf.predhclient ]; then
|
|
/bin/rm -f /etc/yp.conf
|
|
/bin/mv -f /etc/yp.conf.predhclient /etc/yp.conf
|
|
level=$(/sbin/runlevel)
|
|
level=${level##*\ }
|
|
|
|
if [ "$level" = "unknown" ]; then
|
|
level=1
|
|
fi
|
|
|
|
if [[ "$level" = [0-6] ]] && /sbin/chkconfig --level=$level ypbind >/dev/null 2>&1 && [ -r /var/run/ypbind.pid ] && yppid=$(cat /var/run/ypbind.pid) && [ -d /proc/${yppid} ] && [ "$(if [ -x /sbin/busybox ]; then /sbin/busybox readlink /proc/${yppid}/exe; else echo /sbin/ypbind; fi)" = "/sbin/ypbind" ] ; then
|
|
kill -HUP $yppid
|
|
fi
|
|
fi
|
|
|
|
if [ -x /etc/dhclient-${interface}-down-hooks ]; then
|
|
. /etc/dhclient-${interface}-down-hooks
|
|
elif [ -x /etc/dhclient-down-hooks ]; then
|
|
. /etc/dhclient-down-hooks
|
|
fi
|
|
|
|
if [ x$alias_ip_address != x ]; then
|
|
# Turn off alias interface.
|
|
ifconfig $interface:0- inet 0
|
|
fi
|
|
|
|
if [ x$old_ip_address != x ]; then
|
|
# Shut down interface, which will delete routes and clear arp cache.
|
|
ifconfig $interface inet 0 down
|
|
fi
|
|
|
|
if [ x$alias_ip_address != x ]; then
|
|
ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
|
|
/sbin/ip route replace ${alias_ip_address}/32 $interface:0
|
|
fi
|
|
|
|
exit_with_hooks 0
|
|
fi
|
|
|
|
if [ x$reason = xTIMEOUT ] && [ "x$new_routers" != 'x' ]; then
|
|
if [ x$alias_ip_address != x ]; then
|
|
ifconfig $interface:0- inet 0
|
|
fi
|
|
|
|
ifconfig $interface inet $new_ip_address $new_subnet_arg $new_broadcast_arg
|
|
set $new_routers
|
|
|
|
if ping -q -c 1 -w 10 -I $interface $1; then
|
|
dhconfig
|
|
exit_with_hooks 0
|
|
fi
|
|
|
|
if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 2 ) != 2 )); then
|
|
ifconfig $interface inet 0 down
|
|
fi
|
|
|
|
exit_with_hooks 1
|
|
elif [ x$reason = xTIMEOUT ]; then
|
|
exit_with_hooks 1
|
|
fi
|
|
|
|
exit_with_hooks 0
|