fix

.env

@@ -0,0 +1,6 @@
+HOST="https://chisel.example.com"
+LOCAL_PORT="8080"
+REMOTE_PORT="8080"
+USER="user"
+TOKEN="token"
+PROTOCOL="tcp"

Dockerfile

@@ -11,7 +11,7 @@ RUN go build -o chisel main.go
 FROM alpine:latest
 
 RUN apk update && apk upgrade && \
-    apk add --no-cache socat bash
+    apk add --no-cache bash
 
 COPY --from=builder /chisel/chisel /usr/bin/chisel
 COPY ./entrypoint.sh /entrypoint.sh

README.md

@@ -3,14 +3,13 @@ This container allows to forward a local port to a remote system running chisel
 
 # TODO
 - Load Balancing
-- Error Handling
-- UDP
 
 ## Configuration
 The container is configured through environment variables:
 - `$HOST`: The host running chisel server
-- `$LOCAL_PORT`: The local port to forward
 - `$LOCAL_HOST`: The local host address
+- `$LOCAL_PORT`: The local port to forward
 - `$REMOTE_PORT`: The remote port to expose the forward on
 - `$USER`: Authentication User
 - `$TOKEN`: Authentication Token
+- `$PROTOCOL`: The protocol to use (`tcp` / `udp`)

docker-compose.yml

@@ -2,9 +2,4 @@ services:
   forward:
     build: .
     restart: unless-stopped
-    environment:
+    env_file: .env
-      HOST: "https://chisel.example.com"
-      LOCAL_PORT: "8080"
-      REMOTE_PORT: "8080"
-      USER: "user"
-      TOKEN: "token"

entrypoint.sh

@@ -1,5 +1,3 @@
 #!/bin/bash
 
-socat TCP4-LISTEN:$LOCAL_PORT,fork,reuseaddr TCP4:TCP4:$LOCAL_HOST:$LOCAL_PORT &
+chisel client --auth "$USER:$TOKEN" "$HOST" "R:0.0.0.0:$REMOTE_PORT:$LOCAL_HOST:$LOCAL_PORT/${PROTOCOL:-tcp}"
-chisel client --auth "$USER:$TOKEN" "$HOST" "R:$LOCAL_HOST:$LOCAL_PORT:127.0.0.1:$REMOTE_PORT" &
-wait