Change port forwarder to socat

Dockerfile

@@ -6,7 +6,7 @@ WORKDIR /app
 
 RUN apt-get update
 
-RUN apt-get install -y gcc automake autoconf libssl-dev pkg-config git make ppp ssh
+RUN apt-get install -y gcc automake autoconf libssl-dev pkg-config git make ppp socat
 
 RUN git clone https://github.com/adrienverge/openfortivpn
 
@@ -24,4 +24,4 @@ WORKDIR /app
 
 CMD bash docker-entrypoint.sh
 
-EXPOSE 2200
+EXPOSE 22

README.md

@@ -5,10 +5,11 @@
 ## Usage
 
 ```bash
-sudo docker run --device=/dev/ppp \
-                --cap-add=NET_ADMIN \
+sudo docker run --cap-add=NET_ADMIN \
+                --device=/dev/ppp \
                 --restart=always \
-                -p 65356:2200 \
+                -d \
+                -p 65356:22 \
                 --name gectunnel pinlin/gectunnel
 ```
 

docker-entrypoint.sh

@@ -6,6 +6,6 @@ sleep 3s
 
 while true
 do
-    ssh -o "ExitOnForwardFailure yes" -NL 2200:192.168.80.240:22 localhost
+    socat TCP-LISTEN:22,fork TCP:192.168.80.240:22
     sleep 1s
 done