FROM debian:buster-20210208-slim
RUN apt-get update && apt-get install -y --no-install-recommends \
    curl \
    dnsutils \
    iptables \
    jq \
    nghttp2 \
    tcpdump \
    iproute2 \
    lsof \
    conntrack \
    tshark && \
    rm -rf /var/lib/apt/lists/*

# We still rely on old iptables-legacy syntax.
RUN update-alternatives --set iptables /usr/sbin/iptables-legacy \
    && update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy

ENTRYPOINT [ "tshark", "-i", "any" ]