> I tried to build DHCP-3.0.6, but failed because it could not cope with
> Linux-3.
> I managed (with some difficulty) to get DHCP-4.2.3 to build, but this
> version does not appear to
> work with the current BLFS-bootscripts.
>
>
what works for me:
dhcp-3.0.6, client only
with linux 3.1 / gcc 4.6.1
export CFLAGS="-Wno-unused"
configure
make
objcopy --strip-all client/dhclient /sbin/dhclient
# feel free to copy the man-pages too
mkdir -p /var/state/dhcp
touch /var/state/dhcp/dhclient.leases
cat >/etc/dhcp.conf _EOF_
interface "eth0" {
prepend domain-name-servers 127.0.0.1;
request subnet-mask, broadcast-address, time-offset, routers,
domain-name, domain-name-servers, host-name;
require subnet-mask, domain-name-servers;
script "/etc/dhclient-script";
}
_EOF_
cat >/etc/dhclient-script <_EOF_
#!/bin/bash
# dhclient-script for Linux. Dan Halbert, March, 1997.
# Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
# Updated to iproute2 by Jim Gifford ([email protected])
# Notes:
# 0. This script is based on the netbsd script supplied with dhcp-970306.
# 1. This script was modified to work with iproute2
# 2. cidr_convert based on a script by Kevin Fleming
([email protected])
# 3. Updated to delete addresses when taking an interface down
([email protected])
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
fi
}
dec2binary()
{
local n=$1
local ret=""
while [ $n != 0 ]; do
ret=$[$n%2]$ret
n=$[$n>>1]
done
echo $ret
}
mask_to_binary()
{
echo `dec2binary $1``dec2binary $2``dec2binary $3``dec2binary $4`
}
cidr_convert()
{
netmask=$1
local mask=`mask_to_binary ${netmask//./ }`
mask=${mask%%0*}
cidr=${#mask}
}
# 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 $exit_status
fi
fi
if [ x$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
cidr_convert $new_subnet_mask
new_subnet_arg="$cidr"
fi
if [ x$old_subnet_mask != x ]; then
cidr_convert $old_subnet_mask
old_subnet_arg="$cidr"
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.
ip link set $interface down
ip addr del $alias_ip_address dev $interface
fi
ip link set $interface up
# We need to give the kernel some time to get the interface up.
sleep 1
exit_with_hooks 0
fi
if [ x$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$current_hostname = x$old_host_name ]; then
if [ x$current_hostname = x ] || \
[ x$new_host_name != x$old_host_name ]; then
hostname $new_host_name
fi
fi
if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address
]; then
# IP address changed. Bring down the interface, delete all routes,
# and clear the ARP cache.
ip link set $interface down
ip addr flush dev $interface
fi
if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address
] || \
[ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
ip link set $interface up
ip addr add $new_ip_address/$new_subnet_arg $new_broadcast_arg \
label $interface dev $interface
# Add a network route to the computed network address.
for router in $new_routers; do
ip route add default via $router
done
fi
make_resolv_conf
exit_with_hooks 0
fi
if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason =
xRELEASE ] \
|| [ x$reason = xSTOP ]; then
if [ x$old_ip_address != x ]; then
# Shut down interface, delete routes, and clear arp cache.
ip link set $interface down
ip addr flush dev $interface
fi
exit_with_hooks 0
fi
if [ x$reason = xTIMEOUT ]; then
ip link set $interface up
ip addr set $new_ip_address/$new_subnet_arg $new_broadcast_arg \
label $interface dev $interface
set $new_routers
for router in $new_routers; do
ip route add default via $router
done
make_resolv_conf
exit_with_hooks 0
ip link set $interface down
ip addr flush dev $interface
exit_with_hooks 1
fi
exit_with_hooks 0
_EOF_
--
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