examples/udhcp: do not rewrite resolv.conf if no DNS servers. Closes 6788
[oweals/busybox.git] / examples / udhcp / sample.renew
1 #!/bin/sh
2 # Sample udhcpc bound 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                 /sbin/route add default gw $i dev $interface metric $((metric++))
22         done
23 fi
24
25 # Only replace resolv.conf is we have at least one DNS server
26 if [ -n "$dns" ]
27 then
28         echo -n > $RESOLV_CONF
29         [ -n "$domain" ] && echo domain $domain >> $RESOLV_CONF
30         for i in $dns
31         do
32                 echo adding dns $i
33                 echo nameserver $i >> $RESOLV_CONF
34         done
35 fi