From 1a3c20b4cb57c0ab78b8c19b159e05368bf61adc Mon Sep 17 00:00:00 2001
From: Dominic Grimm <dominic@dergrimm.net>
Date: Fri, 20 Dec 2024 15:53:12 +0100
Subject: [PATCH] t38modem Dockerfile

---
 docker/t38modem/.dockerignore        |  2 +
 docker/t38modem/Dockerfile           | 81 ++++++++++++++++++++++++++++
 docker/t38modem/services/socat.sh    |  6 +++
 docker/t38modem/services/t38modem.sh | 22 ++++++++
 docker/t38modem/start.sh             | 11 ++++
 5 files changed, 122 insertions(+)
 create mode 100644 docker/t38modem/.dockerignore
 create mode 100644 docker/t38modem/Dockerfile
 create mode 100644 docker/t38modem/services/socat.sh
 create mode 100644 docker/t38modem/services/t38modem.sh
 create mode 100644 docker/t38modem/start.sh

diff --git a/docker/t38modem/.dockerignore b/docker/t38modem/.dockerignore
new file mode 100644
index 0000000..45e1bbd
--- /dev/null
+++ b/docker/t38modem/.dockerignore
@@ -0,0 +1,2 @@
+Dockerfile
+docker-compose.yml
diff --git a/docker/t38modem/Dockerfile b/docker/t38modem/Dockerfile
new file mode 100644
index 0000000..8cfbfe7
--- /dev/null
+++ b/docker/t38modem/Dockerfile
@@ -0,0 +1,81 @@
+ARG PTLIB_VERSION="2.18.6"
+ARG PTLIB_VERSION_PATH="v3.18 Cygni/Stable 6/ptlib-2.18.6"
+
+ARG OPAL_VERSION="3.18.6"
+ARG OPAL_VERSION_PATH="v3.18 Cygni/Stable 6/opal-3.18.6"
+
+ARG T38MODEM_VERSION="4.6.2"
+
+FROM docker.io/debian:12.8-slim AS builder
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update \
+  && apt-get upgrade -y \
+  && apt-get install -y --no-install-recommends ca-certificates build-essential pkg-config wget libssl-dev libsrtp2-dev libspandsp-dev
+
+WORKDIR /usr/src
+RUN mkdir /opt/t38modem
+ENV PKG_CONFIG_PATH=/opt/t38modem/lib/pkgconfig
+ENV LD_LIBRARY_PATH=/opt/t38modem/lib
+
+ARG PTLIB_VERSION
+ARG PTLIB_VERSION_PATH
+RUN wget -q -O- "https://sourceforge.net/projects/opalvoip/files/${PTLIB_VERSION_PATH}.tar.bz2" \
+  | tar xj \
+  && cd "ptlib-${PTLIB_VERSION}" \
+  && CPPFLAGS="-O3 -flto=auto" LDFLAGS="-O3 -flto=auto" ./configure --prefix=/opt/t38modem \
+  && make -j$(nproc) \
+  && make install \
+  && rm -rf "/usr/src/ptlib-${PTLIB_VERSION}"
+
+ARG OPAL_VERSION
+ARG OPAL_VERSION_PATH
+RUN wget -q -O- "https://sourceforge.net/projects/opalvoip/files/${OPAL_VERSION_PATH}.tar.bz2" \
+  | tar xj \
+  && cd "opal-${OPAL_VERSION}" \
+  && CPPFLAGS="-O3" ./configure --prefix=/opt/t38modem \
+  && make -j$(nproc) \
+  && make install \
+  && rm -rf "/usr/src/opal-${OPAL_VERSION}"
+
+ARG T38MODEM_VERSION
+RUN wget -q -O- "https://github.com/hehol/t38modem/archive/refs/tags/${T38MODEM_VERSION}.tar.gz" \
+  | tar xz \
+  && cd "t38modem-${T38MODEM_VERSION}" \
+  && CPPFLAGS="-O3 -flto=auto -Wno-narrowing" LDFLAGS="-O3 -flto=auto" make \
+  && mv t38modem /opt/t38modem/bin \
+  && rm -rf "/usr/src/t38modem-${T38MODEM_VERSION}"
+
+FROM docker.io/debian:12.8-slim AS runner
+LABEL maintainer="dominic@dergrimm.net" \
+  org.opencontainers.image.title="t38modem" \
+  org.opencontainers.image.description="t38modem bridged over socat TCP" \
+  org.opencontainers.image.authors="Dominic Grimm" \
+  org.opencontainers.image.source="https://git.dergrimm.net/dergrimm/linux-fax-stack.git"
+
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update \
+  && apt-get upgrade -y \
+  && apt-get install -y ca-certificates socat libssl-dev libsrtp2-dev libspandsp-dev \
+  && apt-get clean -y \
+  && apt-get autoremove -y \
+  && apt-get autoclean -y \
+  && rm -rf /tmp/* \
+  && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /usr/local/t38modem
+COPY --from=builder /opt/t38modem/lib /usr/local/t38modem/lib
+COPY --from=builder /opt/t38modem/bin/t38modem /usr/local/t38modem/bin/t38modem
+COPY services services
+COPY start.sh .
+RUN chmod +x /usr/local/t38modem/services/t38modem.sh /usr/local/t38modem/services/socat.sh /usr/local/t38modem/start.sh
+
+RUN rm -rf /tmp/*
+
+ENV PATH="$PATH:/usr/local/t38modem/bin"
+ENV PREFIX="/usr/local/t38modem"
+ENV LD_LIBRARY_PATH="/usr/local/t38modem/lib"
+ARG PTLIB_VERSION
+ARG OPAL_VERSION
+ENV PTLIBPLUGINDIR="/usr/local/t38modem/lib/ptlib-${PTLIB_VERSION}:/usr/local/t38modem/lib/opal-${OPAL_VERSION}"
+
+ENTRYPOINT [ "/usr/local/t38modem/start.sh" ]
diff --git a/docker/t38modem/services/socat.sh b/docker/t38modem/services/socat.sh
new file mode 100644
index 0000000..2943066
--- /dev/null
+++ b/docker/t38modem/services/socat.sh
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+# $1: PTTY ID
+# $2: TCP server port
+
+socat -d -d "file:${1},raw,echo=0" "TCP-LISTEN:${2},reuseaddr"
diff --git a/docker/t38modem/services/t38modem.sh b/docker/t38modem/services/t38modem.sh
new file mode 100644
index 0000000..28ecd98
--- /dev/null
+++ b/docker/t38modem/services/t38modem.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+PTTY=$(seq -f "+${1}-%g" -s "," "${T38MODEM_MODEM_COUNT}")
+
+CMD=(
+    "t38modem"
+    "--ptty" "${PTTY}"
+    "--sip-proxy" "${T38MODEM_SIP_USERNAME}:${T38MODEM_SIP_PASSWORD}@${T38MODEM_SIP_SERVER}"
+    "--sip-register" "${T38MODEM_SIP_USERNAME}@${T38MODEM_SIP_SERVER},${T38MODEM_SIP_PASSWORD}"
+    "--sip-listen" "udp\$:5060"
+    "--stun" "${T38MODEM_STUN_SERVER}"
+    "--route" "t38:.*=sip:<dn>@${T38MODEM_SIP_SERVER}"
+    "--route" "sip:.*=t38:<dn>"
+)
+
+if [ "$T38MODEM_DISABLE_T38" = true ]; then
+    cmd+=("--disable-t38-mode" "--audio")
+fi
+
+CMD+=("${T38MODEM_CMD_ARGS}")
+
+exec "${CMD[@]}"
diff --git a/docker/t38modem/start.sh b/docker/t38modem/start.sh
new file mode 100644
index 0000000..fb86e53
--- /dev/null
+++ b/docker/t38modem/start.sh
@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+exec "${PREFIX}/services/t38modem.sh" /dev/ttyT38 &
+sleep 5
+
+for i in $(seq "${T38MODEM_MODEM_COUNT}"); do
+    PORT="$(("${T38MODEM_START_PORT}" + i - 1))"
+    exec "${PREFIX}/services/socat.sh" "/dev/ttyT38-${i}" "${PORT}" &
+done
+
+wait