diff options
Diffstat (limited to 'client/scripts/linux')
| -rwxr-xr-x | client/scripts/linux | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/client/scripts/linux b/client/scripts/linux new file mode 100755 index 0000000..e6792c6 --- /dev/null +++ b/client/scripts/linux @@ -0,0 +1,316 @@ +#!/bin/bash +# dhclient-script for Linux. Dan Halbert, March, 1997. +# Updated for Linux 2.[12] by Brian J. Murrell, January 1999. +# No guarantees about this. I'm a novice at the details of Linux +# networking. + +# Notes: + +# 0. This script is based on the netbsd script supplied with dhcp-970306. + +# 1. ifconfig down apparently deletes all relevant routes and flushes +# the arp cache, so this doesn't need to be done explicitly. + +# 2. The alias address handling here has not been tested AT ALL. +# I'm just going by the doc of modern Linux ip aliasing, which uses +# notations like eth0:0, eth0:1, for each alias. + +# 3. I have to calculate the network address, and calculate the broadcast +# address if it is not supplied. This might be much more easily done +# by the dhclient C code, and passed on. + +# 4. TIMEOUT not tested. ping has a flag I don't know, and I'm suspicious +# of the $1 in its args. + +# 'ip' just looks too weird. /sbin/ip looks less weird. +ip=/sbin/ip + +make_resolv_conf() { + if [ x"$new_domain_name_servers" != x ]; then + cat /dev/null > /etc/resolv.conf.dhclient + chmod 644 /etc/resolv.conf.dhclient + if [ x"$new_domain_search" != x ]; then + echo search $new_domain_search >> /etc/resolv.conf.dhclient + elif [ x"$new_domain_name" != x ]; then + # Note that the DHCP 'Domain Name Option' is really just a domain + # name, and that this practice of using the domain name option as + # a search path is both nonstandard and deprecated. + echo search $new_domain_name >> /etc/resolv.conf.dhclient + fi + for nameserver in $new_domain_name_servers; do + echo nameserver $nameserver >>/etc/resolv.conf.dhclient + done + + mv /etc/resolv.conf.dhclient /etc/resolv.conf + elif [ "x${new_dhcp6_name_servers}" != x ] ; then + cat /dev/null > /etc/resolv.conf.dhclient6 + chmod 644 /etc/resolv.conf.dhclient6 + + if [ "x${new_dhcp6_domain_search}" != x ] ; then + echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6 + fi + shopt -s nocasematch + for nameserver in ${new_dhcp6_name_servers} ; do + # If the nameserver has a link-local address + # add a <zone_id> (interface name) to it. + if [[ "$nameserver" =~ ^fe80:: ]] + then + zone_id="%$interface" + else + zone_id= + fi + echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6 + done + shopt -u nocasematch + + mv /etc/resolv.conf.dhclient6 /etc/resolv.conf + fi +} + +# Must be used on exit. Invokes the local dhcp client exit hooks, if any. +exit_with_hooks() { + exit_status=$1 + if [ -f /etc/dhclient-exit-hooks ]; then + . /etc/dhclient-exit-hooks + fi +# probably should do something with exit status of the local script + exit $exit_status +} + +# Invoke the local dhcp client enter hooks, if they exist. +if [ -f /etc/dhclient-enter-hooks ]; then + exit_status=0 + . /etc/dhclient-enter-hooks + # allow the local script to abort processing of this state + # local script must set exit_status variable to nonzero. + if [ $exit_status -ne 0 ]; then + exit $exit_status + fi +fi + +### +### DHCPv4 Handlers +### + +if [ x$new_broadcast_address != x ]; then + new_broadcast_arg="broadcast $new_broadcast_address" +fi +if [ x$old_broadcast_address != x ]; then + old_broadcast_arg="broadcast $old_broadcast_address" +fi +if [ x$new_subnet_mask != x ]; then + new_subnet_arg="netmask $new_subnet_mask" +fi +if [ x$old_subnet_mask != x ]; then + old_subnet_arg="netmask $old_subnet_mask" +fi +if [ x$alias_subnet_mask != x ]; then + alias_subnet_arg="netmask $alias_subnet_mask" +fi +if [ x$new_interface_mtu != x ]; then + mtu_arg="mtu $new_interface_mtu" +fi +if [ x$IF_METRIC != x ]; then + metric_arg="metric $IF_METRIC" +fi + +if [ x$reason = xMEDIUM ]; then + # Linux doesn't do mediums (ok, ok, media). + exit_with_hooks 0 +fi + +if [ x$reason = xPREINIT ]; then + if [ x$alias_ip_address != x ]; then + # Bring down alias interface. Its routes will disappear too. + ifconfig $interface:0- inet 0 + fi + ifconfig $interface 0 up + + # We need to give the kernel some time to get the interface up. + sleep 1 + + exit_with_hooks 0 +fi + +if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then + exit_with_hooks 0 +fi + +if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \ + [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then + current_hostname=`hostname` + if [ x$current_hostname = x ] || \ + [ x$current_hostname = "x(none)" ] || \ + [ x$current_hostname = xlocalhost ] || \ + [ x$current_hostname = x$old_host_name ]; then + if [ x$new_host_name != x$old_host_name ]; then + hostname "$new_host_name" + fi + fi + + if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \ + [ x$alias_ip_address != x$old_ip_address ]; then + # Possible new alias. Remove old alias. + ifconfig $interface:0- inet 0 + fi + if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then + # IP address changed. Bringing down the interface will delete all routes, + # and clear the ARP cache. + ifconfig $interface inet 0 down + + fi + if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \ + [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then + + ifconfig $interface inet $new_ip_address $new_subnet_arg \ + $new_broadcast_arg $mtu_arg + # Add a network route to the computed network address. + for router in $new_routers; do + if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then + route add -host $router dev $interface + fi + route add default gw $router $metric_arg dev $interface + done + else + # we haven't changed the address, have we changed other options + # that we wish to update? + if [ x$new_routers != x ] && [ x$new_routers != x$old_routers ] ; then + # if we've changed routers delete the old and add the new. + for router in $old_routers; do + route del default gw $router + done + for router in $new_routers; do + if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then + route add -host $router dev $interface + fi + route add default gw $router $metric_arg dev $interface + done + fi + fi + if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ]; + then + ifconfig $interface:0- inet 0 + ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg + route add -host $alias_ip_address $interface:0 + fi + make_resolv_conf + exit_with_hooks 0 +fi + +if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \ + || [ x$reason = xSTOP ]; then + if [ x$alias_ip_address != x ]; then + # Turn off alias interface. + ifconfig $interface:0- inet 0 + fi + if [ x$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 + route add -host $alias_ip_address $interface:0 + fi + exit_with_hooks 0 +fi + +if [ x$reason = xTIMEOUT ]; 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 $mtu_arg + set $new_routers + if ping -q -c 1 $1; then + if [ x$new_ip_address != x$alias_ip_address ] && \ + [ x$alias_ip_address != x ]; then + ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg + route add -host $alias_ip_address dev $interface:0 + fi + for router in $new_routers; do + if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then + route add -host $router dev $interface + fi + route add default gw $router $metric_arg dev $interface + done + make_resolv_conf + exit_with_hooks 0 + fi + ifconfig $interface inet 0 down + exit_with_hooks 1 +fi + +### +### DHCPv6 Handlers +### + +if [ x$reason = xPREINIT6 ] ; then + # Ensure interface is up. + ${ip} link set ${interface} up + + # Remove any stale addresses from aborted clients. + ${ip} -f inet6 addr flush dev ${interface} scope global permanent + + exit_with_hooks 0 +fi + +if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then + echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix} + + exit_with_hooks 0 +fi + +if [ x$reason = xBOUND6 ] ; then + if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then + exit_with_hooks 2; + fi + + ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \ + dev ${interface} scope global + + # Check for nameserver options. + make_resolv_conf + + exit_with_hooks 0 +fi + +if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ] ; then + if [ x${new_ip6_address} != x ] && [ x${new_ip6_prefixlen} != x ] ; then + ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \ + dev ${interface} scope global + fi + + # Make sure nothing has moved around on us. + + # Nameservers/domains/etc. + if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] || + [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then + make_resolv_conf + fi + + exit_with_hooks 0 +fi + +if [ x$reason = xDEPREF6 ] ; then + if [ x${new_ip6_prefixlen} = x ] ; then + exit_with_hooks 2; + fi + + ${ip} -f inet6 addr change ${new_ip6_address}/${new_ip6_prefixlen} \ + dev ${interface} scope global preferred_lft 0 + + exit_with_hooks 0 +fi + +if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ] ; then + if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then + exit_with_hooks 2; + fi + + ${ip} -f inet6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \ + dev ${interface} + + exit_with_hooks 0 +fi + +exit_with_hooks 0 |