examples/udhcp/sample.renew

   1 #!/bin/sh
   2 # Sample udhcpc renew script
   3
   4 RESOLV_CONF="/etc/udhcpc/resolv.conf"
   5
   6 [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
   7 [ -n "$subnet" ] && NETMASK="netmask $subnet"
   8
   9 /sbin/ifconfig $interface $ip $BROADCAST $NETMASK
  10
  11 if [ -n "$router" ]
  12 then
  13         echo "deleting routers"
  14         while /sbin/route del default gw 0.0.0.0 dev $interface
  15         do :
  16         done
  17
  18         metric=0
  19         for i in $router
  20         do
  21                 if [ "$subnet" = "255.255.255.255" ]; then
  22                         # special case for /32 subnets:
  23                         # /32 instructs kernel to always use routing for all outgoing packets
  24                         # (they can never be sent to local subnet - there is no local subnet for /32).
  25                         # Used in datacenters, avoids the need for private ip-addresses between two hops.
  26                         /sbin/ip route add $i dev $interface
  27                 fi
  28                 /sbin/route add default gw $i dev $interface metric $((metric++))
  29         done
  30 fi
  31
  32 # Only replace resolv.conf if we have at least one DNS server
  33 if [ -n "$dns" ]
  34 then
  35         echo -n > $RESOLV_CONF
  36         [ -n "$domain" ] && echo domain $domain >> $RESOLV_CONF
  37         for i in $dns
  38         do
  39                 echo adding dns $i
  40                 echo nameserver $i >> $RESOLV_CONF
  41         done
  42 fi