Fix Dockerfile and create run script

README.md

@@ -1,6 +1,6 @@
 # openconnect + tinyproxy + microsocks
 
-This Docker image contains an [openconnect client](http://www.infradead.org/openconnect/) (version 8.04 with pulse/juniper support) and the [tinyproxy proxy server](https://tinyproxy.github.io/) for http/s connections (default on port 8888) and the [microsocks proxy](https://github.com/rofl0r/microsocks) for socks5 connections (default on port 8889) in a very small [alpine linux](https://www.alpinelinux.org/) image (around 20 MB).
+This Docker image contains an [openconnect client](http://www.infradead.org/openconnect/) (version 8.04 with pulse/juniper support) and the [tinyproxy proxy server](https://tinyproxy.github.io/) for http/https connections (default on port 8888) and the [microsocks proxy](https://github.com/rofl0r/microsocks) for socks5 connections (default on port 8889) in a very small [alpine linux](https://www.alpinelinux.org/) image (around 20 MB).
 
 You can find the image on docker hub:
 https://hub.docker.com/r/wazum/openconnect-proxy
@@ -17,7 +17,9 @@ set the environment variables in a `.env` file:
 		--servercert <VPN Server Certificate> --protocol=<Protocol> \
 		--reconnect-timeout 86400
 
-_(don't use quotes around the values!)_
+_Don't use quotes around the values!_
+
+See the [openconnect documentation](https://www.infradead.org/openconnect/manual.html) for available options. 
 
 Either set the password in the `.env` file or leave the variable `OPENCONNECT_PASSWORD` unset, so you get prompted when starting up the container.
 
@@ -25,18 +27,14 @@ Optionally set a multi factor authentication code:
 
 	OPENCONNECT_MFA_CODE=<Multi factor authentication code>
 
-You can also change the ports the proxies are listening on (these are the default values):
-
-	HTTPS_PROXY_PORT=8888
-	SOCKS5_PROXY_PORT=8889
-
 # Run container in foreground
 
 To start the container in foreground run:
 
-	docker run -it --rm --privileged --env-file=.env --net host wazum/openconnect-proxy
+	docker run -it --rm --privileged --env-file=.env \
+	  -p 8888:8888 -p 8889:8889 wazum/openconnect-proxy:latest
 
-Either use `--net host` or `-p 8888:8888 -p 8889:8889` to make the proxy ports available on the host.
+The proxies are listening on ports 8888 (http/https) and 8889 (socks). Either use `--net host` or `-p <local port>:8888 -p <local port>:8889` to make the proxy ports available on the host.
 
 Without using a `.env` file set the environment variables on the command line with the docker run option `-e`:
 
@@ -56,7 +54,6 @@ In daemon mode you can view the stderr log with `docker logs`:
 
 # Use container with docker-compose
 
-```
 	vpn:
 	  container_name: openconnect_vpn
 	  image: wazum/openconnect-proxy:latest
@@ -66,19 +63,31 @@ In daemon mode you can view the stderr log with `docker logs`:
 	  ports:
 	    - 8888:8888
 	    - 8889:8889
+	  cap_add:
+	    - NET_ADMIN
 	  networks:
 	    - mynetwork
-```
+
 
 Set the environment variables for _openconnect_ in the `.env` file again (or specify another file) and 
 map the configured ports in the container to your local ports if you want to access the VPN 
 on the host too when running your containers. Otherwise only the docker containers in the same
 network have access to the proxy ports.
 
+# Route traffic through VPN container
+
+Let's say you have a `vpn` container defined as above, then add `network_mode` option to your other containers:
+
+	depends_on:
+	  - vpn
+	network_mode: "service:vpn"
+
+Keep in mind that `networks`, `extra_hosts`, etc. and `network_mode` are mutually exclusive!
+
 # Configure proxy
 
 The container is connected via _openconnect_ and now you can configure your browser
-and other software to use one of the proxies (8888 for http/s or 8889 for socks).
+and other software to use one of the proxies (8888 for http/https or 8889 for socks).
 
 For example FoxyProxy (available for Firefox, Chrome) is a suitable browser extension.
 

build/Dockerfile

@@ -17,6 +17,11 @@ RUN apk add --no-cache ca-certificates wget \
     && cd microsocks-1.0.1 \
     && make \
     && make install \
+    # add vpn-slice with dependencies (dig) https://github.com/dlenski/vpn-slice
+    && apk add --no-cache python3 py3-pip bind-tools && pip3 install --upgrade pip \
+    && pip3 install https://github.com/dlenski/vpn-slice/archive/master.zip \
+    # always add the docker DNS server
+    && grep -qxF 'nameserver 127.0.0.11' /etc/resolv.conf || echo 'nameserver 127.0.0.11' >> /etc/resolv.conf \
     && apk del .build-deps wget
 
 # Use an up-to-date version of vpnc-script
@@ -29,10 +34,7 @@ COPY tinyproxy.conf /etc/tinyproxy.conf
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
-ENV HTTPS_PROXY_PORT=${HTTPS_PROXY_PORT:-8888}
-ENV SOCKS5_PROXY_PORT=${SOCKS5_PROXY_PORT:-8889}
-
-EXPOSE ${HTTPS_PROXY_PORT}
-EXPOSE ${SOCKS5_PROXY_PORT}
+EXPOSE 8888
+EXPOSE 8889
 
 ENTRYPOINT ["/entrypoint.sh"]

build/entrypoint.sh

@@ -1,15 +1,11 @@
 #!/bin/sh
 
-# Set proxy port
-sed "s/^Port .*$/Port $HTTPS_PROXY_PORT/" -i /etc/tinyproxy.conf
+sed "s/^Port .*$/Port 8888/" -i /etc/tinyproxy.conf
+/usr/bin/tinyproxy -c /etc/tinyproxy.conf
 
-# Start proxy
-/usr/bin/tinyproxy -c /etc/tinyproxy.conf && echo "HTTP/S proxy listening on $HTTPS_PROXY_PORT"
-
-# Start socks5 proxy
-/usr/local/bin/microsocks -i 0.0.0.0 -p $SOCKS5_PROXY_PORT & 
-echo "socks5 proxy listening on $SOCKS5_PROXY_PORT"
+/usr/local/bin/microsocks -i 0.0.0.0 -p 8889 & 
 
+run () {
   # Start openconnect
   if [[ -z "${OPENCONNECT_PASSWORD}" ]]; then
   # Ask for password
@@ -21,3 +17,10 @@ elif [[ ! -z "${OPENCONNECT_PASSWORD}" ]]; then
   # Standard authentication
     echo $OPENCONNECT_PASSWORD | openconnect -u $OPENCONNECT_USER $OPENCONNECT_OPTIONS --passwd-on-stdin $OPENCONNECT_URL
   fi
+}
+
+until (run); do
+  echo "openconnect exited. Restarting process in 60 seconds…" >&2
+  sleep 60
+done
+

build/vpnc-script

@@ -501,6 +501,10 @@ $LINE" ;;
 	done
 	exec 6<&-
 
+	# Add default Docker nameserver
+	NEW_RESOLVCONF="$NEW_RESOLVCONF
+nameserver 127.0.0.11"
+
 	for i in $INTERNAL_IP4_DNS ; do
 		NEW_RESOLVCONF="$NEW_RESOLVCONF
 nameserver $i"
@@ -676,6 +680,9 @@ restore_resolvconf_openwrt() {
 # === resolv.conf handling via /sbin/resolvconf (Debian, Ubuntu, Gentoo)) =========
 
 modify_resolvconf_manager() {
+	# Add default Docker nameserver
+	NEW_RESOLVCONF="$NEW_RESOLVCONF
+nameserver 127.0.0.11"
 	NEW_RESOLVCONF=""
 	for i in $INTERNAL_IP4_DNS; do
 		NEW_RESOLVCONF="$NEW_RESOLVCONF

run.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env sh
+
+CONTAINER_TAG=openconnect_vpn
+
+docker build -t "$CONTAINER_TAG" build/
+
+docker run \
+  -it \
+  --privileged \
+  --cap-add NET_ADMIN \
+  -e OPENCONNECT_URL= \
+  -e OPENCONNECT_USER= \
+  -p 9000:8888 \
+  -p 9001:8889 \
+  "$CONTAINER_TAG"