add pptpd

pptpd/Dockerfile

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+#
+# Dockerfile for pptpd
+#
+
+FROM alpine
+MAINTAINER kev<noreply@datageek.info>
+
+RUN apk add -U iptables \
+               ppp \
+               pptpd \
+    && rm -rf /var/cache/apk/*
+
+RUN echo "username * password *"      >> /etc/ppp/chap-secrets \
+    && echo "localip 10.10.10.1"      >> /etc/pptpd.conf \
+    && echo "remoteip 10.10.10.2-254" >> /etc/pptpd.conf \
+    && echo "ms-dns 8.8.8.8"          >> /etc/ppp/pptpd-options \
+    && echo "ms-dns 8.8.4.4"          >> /etc/ppp/pptpd-options
+
+EXPOSE 1723
+
+CMD iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE \
+    && pptpd --fg --logwtmp
+

pptpd/README.md

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+pptpd
+=====
+
+This is still a work in progress, a successful connection has not been made.
+
+You must open the following ports:
+
+- To allow PPTP tunnel maintenance traffic, open `1723/tcp`.
+- To allow PPTP tunneled data to pass through router, open `Protocol 47`.
+

pptpd/chap-secrets

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+# Secrets for authentication using CHAP
+# client    server  secret          IP addresses
+
+username    *       password        *

pptpd/docker-compose.yml

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+pptp:
+  image: vimagick/pptp:latest
+  ports:
+    - "1723:1723"
+  volumes:
+    - ./chap-secrets:/etc/ppp/chap-secrets
+  privileged: true
+  restart: always