commit 50b22bba7952498d5d3042adbbf842d923bc8631
Author: Josh J <josh@joshjacobs.net>
Date:   Thu Aug 12 16:12:07 2021 +0100

    Init Commit

diff --git a/Dockerfile b/Dockerfile
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--- /dev/null
+++ b/Dockerfile
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+FROM debian:buster as stage
+ARG PACKAGE_BASEURL=https://download.zerotier.com/debian/buster/pool/main/z/zerotier-one
+ARG ARCH=amd64
+ARG VERSION=1.6.5
+RUN apt-get update -qq && apt-get install -qq --no-install-recommends -y ca-certificates=20200601~deb10u2 curl=7.64.0-4+deb10u2
+RUN curl -sSL -o zerotier-one.deb "${PACKAGE_BASEURL}/zerotier-one_${VERSION}_${ARCH}.deb"
+
+FROM debian:buster
+COPY --from=stage zerotier-one.deb .
+RUN apt-get update -qq && apt-get install -qq --no-install-recommends -y procps=2:3.3.15-2 iptables=1.8.2-4 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+RUN dpkg -i zerotier-one.deb && rm -f zerotier-one.deb
+RUN echo "${VERSION}" >/etc/zerotier-version
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod 755 /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]
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diff --git a/entrypoint.sh b/entrypoint.sh
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+++ b/entrypoint.sh
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+#!/bin/sh
+
+grepzt() {
+  (find /proc -name exe | xargs -I{} readlink {}) 2>/dev/null | grep -q zerotier-one
+  return $?
+}
+
+echo "starting zerotier"
+setsid /usr/sbin/zerotier-one &
+
+while ! grepzt
+do
+  echo "zerotier hasn't started, waiting a second"
+  sleep 1
+done
+
+echo "joining networks: $ZT_NETWORK"
+
+echo "joining $ZT_NETWORK"
+
+while ! zerotier-cli join "$ZT_NETWORK"
+do 
+    echo "joining $ZT_NETWORK failed; trying again in 1s"
+    sleep 1
+done
+
+
+### Set IPTables to allow NATting
+echo "setting up NATting"
+sysctl -w net.ipv4.ip_forward=1
+PHY_IFACE=eth0; ZT_IFACE=$(ls /sys/class/net | grep ^zt)
+
+iptables -t nat -A POSTROUTING -o $PHY_IFACE -j MASQUERADE
+iptables -A FORWARD -i $PHY_IFACE -o $ZT_IFACE -m state --state RELATED,ESTABLISHED -j ACCEPT
+iptables -A FORWARD -i $ZT_IFACE -o $PHY_IFACE -j ACCEPT
+
+echo "iptables --list-rules"
+echo "$(ip a)"
+
+sleep infinity
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