I made some modifications to dhclient-script to support more options on
some of my linux systems. Please incorporate these into the upstream
version if you think they are reasonable. The mods were based on the
debian package for 2.0b1pl6. I've attached the entire file, but here are
the main points.
1. add support for setting and changing static routes through dhcp
2. set nisdomainname through dhcp
3. set hostname through dhcp
Jim,
I copied you because this isn't a direct reply to your email, but
you may need the static route code. It sounded like "netstat -r"
wasn't returning routes you set on your dhcp server, but the original
dhclient-script I had ignored static route info.
code excerpts:
==============
function update_static_routes () {
local action static_routes destination gateway
action=$1
static_routes="$2 " # add space for easy looping
while [ "$static_routes" ]; do
destination=${static_routes%% *}
static_routes=${static_routes#* }
gateway=${static_routes%% *}
static_routes=${static_routes#* }
route $action $destination gw $gateway
done
}
...
# don't need to test old values for domain/host
# no problems if resetting them to identical value??
if [ x$new_nis_domain != x ]; then
echo $new_nis_domain >/etc/defaultdomain
nisdomainname `cat /etc/defaultdomain`
fi
if [ x$new_host_name != x ]; then
echo $new_host_name >/etc/hostname
hostname --file /etc/hostname
fi
# old and new static routes different?
if [ "x$old_static_routes" != "x$new_static_routes" ]; then
# delete old static routes if they existed
if [ "x$old_static_routes" != "x" ]; then
update_static_routes "del -net" "$old_static_routes"
fi
# add new static routes if they exist
if [ "x$new_static_routes" != "x" ]; then
update_static_routes "add -net" "$new_static_routes"
fi
fi
--
Lee Bradshaw [EMAIL PROTECTED] (preferred)
Alantro Communications leealantro.com
#!/bin/sh
# dhclient-script for Linux. Dan Halbert, March, 1997.
# 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.
function update_static_routes () {
local action static_routes destination gateway
action=$1
static_routes="$2 " # add space for easy looping
while [ "$static_routes" ]; do
destination=${static_routes%% *}
static_routes=${static_routes#* }
gateway=${static_routes%% *}
static_routes=${static_routes#* }
route $action $destination gw $gateway
done
}
if [ x$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 $alias_subnet_mask"
fi
if [ x$reason = xMEDIUM ]; then
# Linux doesn't do mediums (ok, ok, media).
exit 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 inet 0.0.0.0 netmask 0.0.0.0 \
broadcast 255.255.255.255 up
# Add route to make broadcast work. Do not omit netmask.
route add default dev $interface netmask 0.0.0.0
exit 0
fi
if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
exit 0;
fi
if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
[ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
if [ x$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 $interface inet down
fi
if [ x$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
# Add a network route to the computed network address.
route add -net $new_network_number $new_subnet_arg dev $interface
for router in $new_routers; do
route add default gw $router
done
# don't need to test old values for domain/host
# no problems if resetting them to identical value??
if [ x$new_nis_domain != x ]; then
echo $new_nis_domain >/etc/defaultdomain
nisdomainname `cat /etc/defaultdomain`
fi
if [ x$new_host_name != x ]; then
echo $new_host_name >/etc/hostname
hostname --file /etc/hostname
fi
# old and new static routes different?
if [ "x$old_static_routes" != "x$new_static_routes" ]; then
# delete old static routes if they existed
if [ "x$old_static_routes" != "x" ]; then
update_static_routes "del -net" "$old_static_routes"
fi
# add new static routes if they exist
if [ "x$new_static_routes" != "x" ]; then
update_static_routes "add -net" "$new_static_routes"
fi
fi
fi
if [ x$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
echo domain $new_domain_name >/etc/resolv.conf
for nameserver in $new_domain_name_servers; do
echo nameserver $nameserver >>/etc/resolv.conf
done
exit 0
fi
if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ]; then
if [ x$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 $interface inet down
fi
if [ x$alias_ip_address != x ]; then
ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
route add -host $alias_ip_address $interface:0
fi
exit 0
fi
if [ x$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
set $new_routers
############## what is -w in ping?
if ping -q -c 1 -w 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
route add -net $new_network_number
for router in $new_routers; do
route add default gw $router
done
# don't need to test old values for domain/host
# no problems if resetting them to identical value??
if [ x$new_nis_domain != x ]; then
echo $new_nis_domain >/etc/defaultdomain
nisdomainname `cat /etc/defaultdomain`
fi
if [ x$new_host_name != x ]; then
echo $new_host_name >/etc/hostname
hostname --file /etc/hostname
fi
# old and new static routes different?
if [ "x$old_static_routes" != "x$new_static_routes" ]; then
# delete old static routes if they existed
if [ "x$old_static_routes" != "x" ]; then
update_static_routes "del -net" "$old_static_routes"
fi
# add new static routes if they exist
if [ "x$new_static_routes" != "x" ]; then
update_static_routes "add -net" "$new_static_routes"
fi
fi
echo domain $new_domain_name >/etc/resolv.conf.std
for nameserver in $new_domain_name_servers; do
echo nameserver $nameserver >>/etc/resolv.conf.std
done
if [ -f /etc/resolv.conf ]; then
rm -f /etc/resolv.conf
ln /etc/resolv.conf.std /etc/resolv.conf
fi
exit 0
fi
ifconfig $interface inet down
exit 1
fi
exit 0
