FROM docker.io/alpine:latest AS builder

RUN apk add --no-cache build-base linux-headers

COPY mdns-repeater.c /src/
RUN gcc -static -O2 -o /mdns-repeater /src/mdns-repeater.c -lpthread

FROM docker.io/alpine:latest AS runtime

LABEL org.opencontainers.image.created="%%CREATED%%"
LABEL org.opencontainers.image.authors="Ricardo Band <email@ricardo.band>"
LABEL org.opencontainers.image.url="https://git.xengi.de/xengi/mdns-reflector"
LABEL org.opencontainers.image.source="https://git.xengi.de/xengi/mdns-reflector"
LABEL org.opencontainers.image.version="latest"
LABEL org.opencontainers.image.revision="%%COMMIT%%"
LABEL org.opencontainers.image.title="mdns-reflector"
LABEL org.opencontainers.image.description="IPv4 + IPv6 mDNS reflector for MikroTik RouterOS"

COPY --from=builder /mdns-repeater /usr/local/bin/
COPY --chmod=755 entrypoint.sh /
COPY --chmod=755 healthcheck.sh /usr/local/bin/

RUN apk add --no-cache libcap iproute2 su-exec \
 && adduser -D -s /sbin/nologin mdns \
 && setcap 'cap_net_raw,cap_net_bind_service=+ep' /usr/local/bin/mdns-repeater \
 && mkdir -p /tmp \
 && chown mdns:mdns /tmp

HEALTHCHECK --interval=15s --timeout=5s --start-period=5s --retries=3 \
    CMD /usr/local/bin/healthcheck.sh

EXPOSE 5353/udp

ENTRYPOINT ["/entrypoint.sh"]