source: drbl_ui/backup/test_busybox/busybox-1.7.2/examples/udhcp/sample.renew @ 37

#!/bin/sh
# Sample udhcpc bound script

RESOLV_CONF="/etc/udhcpc/resolv.conf"

[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"

/sbin/ifconfig $interface $ip $BROADCAST $NETMASK

if [ -n "$router" ]
then
  echo "deleting routers"
  while /sbin/route del default gw 0.0.0.0 dev $interface
  do :
  done

  metric=0
  for i in $router
  do
    /sbin/route add default gw $i dev $interface metric $((metric++))
  done
fi

echo -n > $RESOLV_CONF
[ -n "$domain" ] && echo domain $domain >> $RESOLV_CONF
for i in $dns
do
  echo adding dns $i
  echo nameserver $i >> $RESOLV_CONF
done