dns-1

#!/bin/sh

# debug:
export DEBUG=on

# no debug:
#unset DEBUG

dbg_echo () {
          [[ "$DEBUG" ]] && builtin echo $@
}

export nameserver=$(cat /proc/net/pnp | grep nameserver | awk '{print $2}')

if [ -z "${nameserver}" ]; then
   # we have no namersver entry in /proc/net/pnp
   dbg_echo "no nameserver"
else
   # we do have a nameserver entry in /proc/net/pnp
   dbg_echo "nameserver: ${nameserver}"
   # sysvinit:
   if [ $(pidof /sbin/init) ]; then
      dbg_echo "it's sysvinit"
      # we just make some entry of nameservers in /etc/resolv.conf
      # interface is irrelevant at the moment
      echo "nameserver 192.168.42.254
            nameserver 8.8.8.8
            search res.training" | resolvconf -a dummy.if
   fi
   # systemd:
   if [ $(pidof systemd) ]; then
      dbg_echo "it's systemd"
      dbg_echo "systemd-resolve --interface eth0 --set-dns ${nameserver}"
      systemd-resolve --interface eth0 --set-dns ${nameserver}
   fi
fi