224 lines
7.0 KiB
Bash
Executable File
224 lines
7.0 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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# 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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# 4. TIMEOUT not tested. ping has a flag I don't know, and I'm suspicious
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# of the $1 in its args.
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if [ -n "${dhc_dbus}" ]; then
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/bin/dbus-send \
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--system --dest=com.redhat.dhcp --type=method_call \
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/com/redhat/dhcp/$interface com.redhat.dhcp.set \
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'string:'"`env | /bin/egrep -v '^(PATH|SHLVL|_|PWD|dhc_dbus)\='`";
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if (( ( dhc_dbus & 31 ) == 31 )); then
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exit 0;
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fi;
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fi;
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make_resolv_conf() {
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if [ "x$new_domain_name" != x ] && [ x"$new_domain_name_servers" != x ]; then
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echo search $new_domain_name >/etc/resolv.conf
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chmod 644 /etc/resolv.conf
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for nameserver in $new_domain_name_servers; do
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echo nameserver $nameserver >>/etc/resolv.conf
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done
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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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release=`uname -r`
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release=`expr $release : '\(.*\)\..*'`
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relminor=`echo $release |sed -e 's/[0-9]*\.\([0-9][0-9]*\)\(\..*\)*$/\1/'`
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relmajor=`echo $release |sed -e 's/\([0-9][0-9]*\)\..*$/\1/'`
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if [ x$new_broadcast_address != x ]; then
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new_broadcast_arg="broadcast $new_broadcast_address"
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fi
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if [ x$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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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 [ $relmajor -lt 2 ] || ( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] )
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then
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ifconfig $interface inet 0.0.0.0 netmask 0.0.0.0 \
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broadcast 255.255.255.255 up
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# Add route to make broadcast work. Do not omit netmask.
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route add default dev $interface netmask 0.0.0.0
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else
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ifconfig $interface 0 up
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fi
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# We need to give the kernel some time to get the interface up.
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sleep 1
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exit_with_hooks 0
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fi
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if [ x$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 $new_host_name
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fi
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fi
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if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 2 ) != 2 )); then
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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 $interface:0- inet 0
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fi
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if [ x$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 routes,
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# and clear the ARP cache.
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ifconfig $interface inet 0 down
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fi
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fi
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if [ x$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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if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 2 ) != 2 )); then
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ifconfig $interface inet $new_ip_address $new_subnet_arg \
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$new_broadcast_arg
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fi
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if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 4 ) != 4 )); then
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# Add a network route to the computed network address.
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if [ $relmajor -lt 2 ] || \
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( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] ); then
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route add -net $new_network_number $new_subnet_arg dev $interface
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fi
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for router in $new_routers; do
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route add default gw $router
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done
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fi
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fi
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if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 2 ) != 2 )); then
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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- inet 0
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ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
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route add -host $alias_ip_address $interface:0
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fi
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fi
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if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 1 ) != 1 )); 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 [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 2 ) != 2 )); then
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if [ x$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 $interface:0- inet 0
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fi
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if [ x$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 $interface inet 0 down
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fi
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if [ x$alias_ip_address != x ]; then
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ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
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route add -host $alias_ip_address $interface:0
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fi
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exit_with_hooks 0
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fi
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fi
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if [ x$reason = xTIMEOUT ]; then
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if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 2 ) != 2 )); then
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if [ x$alias_ip_address != x ]; then
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ifconfig $interface:0- inet 0
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fi
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ifconfig $interface inet $new_ip_address $new_subnet_arg \
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$new_broadcast_arg
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fi
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set $new_routers
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############## what is -w in ping?
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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 inet $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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if [ $relmajor -lt 2 ] || \
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( [ $relmajor -eq 2 ] && [ $relminor -eq 0 ] ); then
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route add -net $new_network_number
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fi
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for router in $new_routers; do
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route add default gw $router
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done
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make_resolv_conf
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exit_with_hooks 0
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fi
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if [ -z "${dhc_dbus}" ] || (( ( dhc_dbus & 2 ) != 2 )); then
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ifconfig $interface inet 0 down
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fi
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exit_with_hooks 1
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fi
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exit_with_hooks 0
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