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#!/bin/sh
# udhcpc config script
# $interface is the name of the device udhcpc is using
# $router is the (space_separated) list of gateways
# $broadcast is the broadcast address
# $ip is the ip address that we get from the dhcp server
# $dns is the list of dns servers we get from the dhcp server
# $domain is the domain of the network
# constants for the resolv.conf and backup files
resolv_conf="/etc/resolv.conf"
resolv_bak="/etc/resolv.backup_dhcp"
case $1 in
deconfig)
# deconfig - put the interface up but deconfigured
# called when udhcpc is started or a lease is lost
# replace resolv.conf with the backup, if the backup exists:
if [ -f "$resolv_bak" ]; then
mv "$resolv_bak" "$resolv_conf"
fi
# set the interface's address to 0.0.0.0 for now
ifconfig $interface 0.0.0.0;;
renew|bound)
# renew - lease is renewed
# bound - move from unbound to bound state
# configure the interface with the given ip, broadcast address, and netmask
ifconfig $interface $ip ${broadcast:+broadcast $broadcast} ${subnet:+netmask $subnet}
# for each given gateway, overwrite the defaults??? hell if I know.
for i in $router; do
route add default gw $i dev $interface
done
if [ ! -f "$resolv_bak" ] && [ -f "$resolv_conf" ]; then
mv "$resolv_conf" "$resolv_bak"
fi
# clear `resolv.conf`
echo -n "" > "$resolv_conf"
# if there's a domain given, add it to `resolv.conf`.
if [ -n "$domain" ]; then
echo "search $domain" >> "$resolv_conf"
fi
# for each given dns server, add it to `resolv.conf`.
for i in $dns; do
echo "nameserver $i" >> "$resolv_conf"
done;;
esac
exit 0
# adapted from http://lists.debian.org/debian-boot/2002/11/msg00500.html
# from https://gist.githubusercontent.com/startling/2165518/raw/415b307b8441c236461296c648b7d975ef9b0dde/gistfile1.sh
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