t38modem Dockerfile
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docker/t38modem/.dockerignore
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docker/t38modem/.dockerignore
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Dockerfile
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docker-compose.yml
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docker/t38modem/Dockerfile
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docker/t38modem/Dockerfile
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ARG PTLIB_VERSION="2.18.6"
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ARG PTLIB_VERSION_PATH="v3.18 Cygni/Stable 6/ptlib-2.18.6"
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ARG OPAL_VERSION="3.18.6"
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ARG OPAL_VERSION_PATH="v3.18 Cygni/Stable 6/opal-3.18.6"
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ARG T38MODEM_VERSION="4.6.2"
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FROM docker.io/debian:12.8-slim AS builder
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ENV DEBIAN_FRONTEND=noninteractive
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RUN apt-get update \
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&& apt-get upgrade -y \
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&& apt-get install -y --no-install-recommends ca-certificates build-essential pkg-config wget libssl-dev libsrtp2-dev libspandsp-dev
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WORKDIR /usr/src
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RUN mkdir /opt/t38modem
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ENV PKG_CONFIG_PATH=/opt/t38modem/lib/pkgconfig
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ENV LD_LIBRARY_PATH=/opt/t38modem/lib
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ARG PTLIB_VERSION
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ARG PTLIB_VERSION_PATH
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RUN wget -q -O- "https://sourceforge.net/projects/opalvoip/files/${PTLIB_VERSION_PATH}.tar.bz2" \
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| tar xj \
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&& cd "ptlib-${PTLIB_VERSION}" \
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&& CPPFLAGS="-O3 -flto=auto" LDFLAGS="-O3 -flto=auto" ./configure --prefix=/opt/t38modem \
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&& make -j$(nproc) \
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&& make install \
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&& rm -rf "/usr/src/ptlib-${PTLIB_VERSION}"
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ARG OPAL_VERSION
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ARG OPAL_VERSION_PATH
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RUN wget -q -O- "https://sourceforge.net/projects/opalvoip/files/${OPAL_VERSION_PATH}.tar.bz2" \
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| tar xj \
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&& cd "opal-${OPAL_VERSION}" \
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&& CPPFLAGS="-O3" ./configure --prefix=/opt/t38modem \
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&& make -j$(nproc) \
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&& make install \
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&& rm -rf "/usr/src/opal-${OPAL_VERSION}"
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ARG T38MODEM_VERSION
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RUN wget -q -O- "https://github.com/hehol/t38modem/archive/refs/tags/${T38MODEM_VERSION}.tar.gz" \
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| tar xz \
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&& cd "t38modem-${T38MODEM_VERSION}" \
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&& CPPFLAGS="-O3 -flto=auto -Wno-narrowing" LDFLAGS="-O3 -flto=auto" make \
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&& mv t38modem /opt/t38modem/bin \
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&& rm -rf "/usr/src/t38modem-${T38MODEM_VERSION}"
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FROM docker.io/debian:12.8-slim AS runner
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LABEL maintainer="dominic@dergrimm.net" \
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org.opencontainers.image.title="t38modem" \
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org.opencontainers.image.description="t38modem bridged over socat TCP" \
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org.opencontainers.image.authors="Dominic Grimm" \
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org.opencontainers.image.source="https://git.dergrimm.net/dergrimm/linux-fax-stack.git"
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ENV DEBIAN_FRONTEND=noninteractive
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RUN apt-get update \
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&& apt-get upgrade -y \
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&& apt-get install -y ca-certificates socat libssl-dev libsrtp2-dev libspandsp-dev \
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&& apt-get clean -y \
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&& apt-get autoremove -y \
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&& apt-get autoclean -y \
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&& rm -rf /tmp/* \
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&& rm -rf /var/lib/apt/lists/*
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WORKDIR /usr/local/t38modem
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COPY --from=builder /opt/t38modem/lib /usr/local/t38modem/lib
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COPY --from=builder /opt/t38modem/bin/t38modem /usr/local/t38modem/bin/t38modem
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COPY services services
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COPY start.sh .
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RUN chmod +x /usr/local/t38modem/services/t38modem.sh /usr/local/t38modem/services/socat.sh /usr/local/t38modem/start.sh
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RUN rm -rf /tmp/*
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ENV PATH="$PATH:/usr/local/t38modem/bin"
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ENV PREFIX="/usr/local/t38modem"
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ENV LD_LIBRARY_PATH="/usr/local/t38modem/lib"
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ARG PTLIB_VERSION
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ARG OPAL_VERSION
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ENV PTLIBPLUGINDIR="/usr/local/t38modem/lib/ptlib-${PTLIB_VERSION}:/usr/local/t38modem/lib/opal-${OPAL_VERSION}"
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ENTRYPOINT [ "/usr/local/t38modem/start.sh" ]
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docker/t38modem/services/socat.sh
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docker/t38modem/services/socat.sh
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#!/usr/bin/env bash
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# $1: PTTY ID
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# $2: TCP server port
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socat -d -d "file:${1},raw,echo=0" "TCP-LISTEN:${2},reuseaddr"
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docker/t38modem/services/t38modem.sh
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docker/t38modem/services/t38modem.sh
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#!/usr/bin/env bash
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PTTY=$(seq -f "+${1}-%g" -s "," "${T38MODEM_MODEM_COUNT}")
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CMD=(
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"t38modem"
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"--ptty" "${PTTY}"
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"--sip-proxy" "${T38MODEM_SIP_USERNAME}:${T38MODEM_SIP_PASSWORD}@${T38MODEM_SIP_SERVER}"
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"--sip-register" "${T38MODEM_SIP_USERNAME}@${T38MODEM_SIP_SERVER},${T38MODEM_SIP_PASSWORD}"
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"--sip-listen" "udp\$:5060"
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"--stun" "${T38MODEM_STUN_SERVER}"
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"--route" "t38:.*=sip:<dn>@${T38MODEM_SIP_SERVER}"
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"--route" "sip:.*=t38:<dn>"
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)
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if [ "$T38MODEM_DISABLE_T38" = true ]; then
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cmd+=("--disable-t38-mode" "--audio")
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fi
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CMD+=("${T38MODEM_CMD_ARGS}")
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exec "${CMD[@]}"
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docker/t38modem/start.sh
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#!/usr/bin/env bash
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exec "${PREFIX}/services/t38modem.sh" /dev/ttyT38 &
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sleep 5
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for i in $(seq "${T38MODEM_MODEM_COUNT}"); do
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PORT="$(("${T38MODEM_START_PORT}" + i - 1))"
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exec "${PREFIX}/services/socat.sh" "/dev/ttyT38-${i}" "${PORT}" &
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done
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wait
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