FROM ubuntu:24.04

RUN apt-get update && \
    apt-get install -y --no-install-recommends \
        socat \
        coreutils \
        patchelf && \
    rm -rf /var/lib/apt/lists/*

RUN useradd --create-home --uid 1337 ctf

COPY reverse_and_polish libc.so.6 ld-linux-x86-64.so.2 /app/
COPY entrypoint.sh /app/entrypoint.sh

RUN chmod +x /app/reverse_and_polish /app/ld-linux-x86-64.so.2 && \
    patchelf --set-interpreter /app/ld-linux-x86-64.so.2 \
             --set-rpath /app \
             /app/reverse_and_polish && \
    sed -i 's/\r$//' /app/entrypoint.sh && \
    chmod +x /app/entrypoint.sh

RUN mkdir -p /data && chown ctf:ctf /data
WORKDIR /data

USER ctf

EXPOSE 1337

ENTRYPOINT ["/app/entrypoint.sh"]
CMD ["socat", "TCP-LISTEN:1337,reuseaddr,fork", "EXEC:stdbuf -i0 -o0 -e0 /app/reverse_and_polish,stderr"]