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path: root/dhcpcd-hooks/20-dns.conf
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# Set net.<iface>.dnsN properties that contain the
# DNS server addresses given by the DHCP server.

if [[ $interface == p2p* ]]
    then
    intf=p2p
    else
    intf=$interface
fi

set_dns_props()
{
    case "${new_domain_name_servers}" in
    "")   return 0;;
    esac

    count=1
    for i in 1 2 3 4; do
        setprop dhcp.${intf}.dns${i} ""
    done
    
    count=1
    for dnsaddr in ${new_domain_name_servers}; do
        setprop dhcp.${intf}.dns${count} ${dnsaddr}
        count=$(($count + 1))
    done
}

unset_dns_props()
{
    for i in 1 2 3 4; do
        setprop dhcp.${intf}.dns${i} ""
    done
}

case "${reason}" in
BOUND|INFORM|REBIND|REBOOT|RENEW|TIMEOUT)       set_dns_props;;
EXPIRE|FAIL|IPV4LL|RELEASE|STOP)                unset_dns_props;;
esac