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# Update domain name server IPv4 addresses and
# restart udhcpd on reconfiguration of the interface.
RESOLV_CONF="/etc/resolv.conf"
UDHCPD_CONF="/tmp/udhcpd.conf"
UDHCPD_CONF_TEMPLATE="/etc/udhcpd.conf"
if $if_configured; then
[ ! -f "$RESOLV_CONF" ] && return
# Filter resolv.conf to get the IPv4 name servers
# only.
dns=$(grep -F nameserver $RESOLV_CONF | cut -c 12- | grep -E "^[0-9\.]*$")
cat $UDHCPD_CONF_TEMPLATE \
| sed "s!%%DNS%%!$dns!" \
> $UDHCPD_CONF
chmod a+r "$UDHCPD_CONF"
service udhcpd --ifstarted restart
fi
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