#!/bin/bash

case "${DHCPD_MODE}" in
  4)
    cat >/etc/dhcp/dhcpd.conf <<EOF
default-lease-time ${DHCPD_DEFAULT_LEASE_TIME};
max-lease-time ${DHCPD_MAX_LEASE_TIME};

subnet ${DHCPD_V4_NET} netmask ${DHCPD_V4_SUBNET} {
  range ${DHCPD_V4_RANGE};
EOF

    [ "${DHCPD_V4_GATEWAY}" ] && \
      printf "  option routers ${DHCPD_V4_GATEWAY};\n" >>/etc/dhcp/dhcpd.conf
    [ "${DHCPD_DOMAIN}" ] && \
      printf "  option domain-name \"${DHCPD_V4_DOMAIN}\";\n" >>/etc/dhcp/dhcpd.conf
    [ "${DHCPD_V4_DNS}" ] && \
      printf "  option domain-name-servers ${DHCPD_V4_DNS};\n" >>/etc/dhcp/dhcpd.conf

    cat >>/etc/dhcp/dhcpd.conf <<EOF
    }
EOF
    touch /var/lib/dhcp/dhcpd.leases
    ;;

  6)
    cat >/etc/dhcp/dhcpd.conf <<EOF
default-lease-time ${DHCPD_DEFAULT_LEASE_TIME};
max-lease-time ${DHCPD_MAX_LEASE_TIME};

subnet6 ${DHCPD_V6_NET} {
  range6 ${DHCPD_V6_RANGE};
EOF
    [ "${DHCPD_V6_TEMPORARY_NET}" ] &&
      printf "  range6 ${DHCPD_V6_TEMPORARY_NET} temporary;\n" >>/etc/dhcp/dhcpd.conf
    [ "${DHCPD_V6_DNS}" ] &&
      printf "  option dhcp6.name-servers ${DHCPD_V6_DNS};\n" >>/etc/dhcp/dhcpd.conf
    [ "${DHCPD_DOMAIN}" ] &&
      printf "  option dhcp6.domain-search ${DHCPD_DOMAIN};\n" >>/etc/dhcp/dhcpd.conf

    cat >>/etc/dhcp/dhcpd.conf <<EOF
    }
EOF
    touch /var/lib/dhcp/dhcpd6.leases
    ;;

  *)
    echo Either DHCPD_MODE 4 or 6 is supported
    exit 1
    ;;

esac

/usr/sbin/dhcpd -${DHCPD_MODE} -f -d -cf /etc/dhcp/dhcpd.conf ${DHCPD_INTERFACE}

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