FROM alpine:3.19.0

RUN apk update \
  && apk upgrade \
  && apk add pdns-recursor \
  && rm -rf /var/cache/apk/*

RUN arch=$([ "$(arch)" = 'aarch64' ] && echo -n 'arm64' || echo -n 'x86_64') \
  && wget -qO- https://github.com/kha7iq/subvars/releases/download/v0.1.4/subvars_Linux_${arch}.tar.gz \
    | tar -xzf - -C /usr/local/bin subvars \
  && chmod +x /usr/local/bin/subvars

RUN mkdir -p /etc/pdns/api.d /var/run/pdns-recursor \
  && chown -R recursor: /etc/pdns/api.d /var/run/pdns-recursor

COPY recursor.conf.tpl docker-entrypoint.sh /

ENV VERSION=4.9 \
  PDNS_setuid=recursor \
  PDNS_setgid=recursor \
  PDNS_daemon=no

EXPOSE 53 53/udp

ENTRYPOINT [ "/docker-entrypoint.sh" ]

CMD [ "/usr/sbin/pdns_recursor" ]