Better logs and start
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@@ -6,6 +6,7 @@ RUN apk add --no-cache socat netcat-openbsd \
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# Create socket directory and copy/set permissions in single layers
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COPY entrypoint.sh /entrypoint.sh
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COPY VERSION /VERSION
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RUN mkdir -p /socket \
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&& chmod +x /entrypoint.sh
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@@ -4,11 +4,9 @@ A lightweight Docker container that creates a UNIX socket proxy to TCP connectio
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## 🚀 Features
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- **Lightweight**: Based on Alpine Linux (~10-15MB image)
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- **Configurable**: Environment variable driven configuration
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- **Socket Management**: Automatic UNIX socket creation and cleanup
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- **Production Ready**: Includes proper error handling and logging
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- **Multi-variant**: Standard and minimal Docker images available
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## 📋 Use Cases example
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+3
-11
@@ -1,11 +1,10 @@
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version: '3.8'
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---
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services:
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socat-proxy:
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build: .
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environment:
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- TARGET_HOST=${TARGET_HOST:}
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- TARGET_PORT=${TARGET_PORT:}
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- TARGET_HOST=${TARGET_HOST}
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- TARGET_PORT=${TARGET_PORT}
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- UNIX_SOCKET_NAME=${UNIX_SOCKET_NAME}
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- UNIX_SOCKET_PATH=${UNIX_SOCKET_PATH}
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- HOST_SOCKET_PATH=${HOST_SOCKET_PATH}
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@@ -14,10 +13,3 @@ services:
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networks:
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- proxy-network
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restart: unless-stopped
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volumes:
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socket_volume:
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networks:
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proxy-network:
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external: false
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+38
-26
@@ -15,46 +15,58 @@ HOST_SOCKET_PATH=${HOST_SOCKET_PATH%/}
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FULL_HOST_SOCKET_PATH="$HOST_SOCKET_PATH/$UNIX_SOCKET_NAME"
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FULL_UNIX_SOCKET_PATH="$UNIX_SOCKET_PATH/$UNIX_SOCKET_NAME"
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VERSION=$(cat VERSION)
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echo -e "${CYAN}╭────────────────────────────────────────────╮${NC}"
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echo -e "${CYAN}│${NC} Socat-proxy - Version ${VERSION}${NC} ${CYAN}│${NC}"
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echo -e "${CYAN}├────────────────────────────────────────────┤${NC}"
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echo -e "${CYAN}│${NC} Source: https://git.djeex.fr/Djeex/socat-proxy ${CYAN}│${NC}"
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echo -e "${CYAN}│${NC} Mirror: https://github.com/Djeex/socat-proxy ${CYAN}│${NC}"
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echo -e "${CYAN}╰────────────────────────────────────────────╯${NC}"
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copy_default_config
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start_server
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# Validate required environment variables
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if [ -z "$TARGET_HOST" ]; then
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echo "ERROR: TARGET_HOST environment variable is required"
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echo "[✗] TARGET_HOST environment variable is required"
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exit 1
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fi
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if [ -z "$TARGET_PORT" ]; then
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echo "ERROR: TARGET_PORT environment variable is required"
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echo "[✗] TARGET_PORT environment variable is required"
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exit 1
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fi
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if [ -z "$UNIX_SOCKET_NAME" ]; then
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echo "ERROR: UNIX_SOCKET_NAME environment variable is required"
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echo "[✗] UNIX_SOCKET_NAME environment variable is required"
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exit 1
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fi
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if [ -z "$UNIX_SOCKET_PATH" ]; then
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echo "ERROR: UNIX_SOCKET_PATH environment variable is required"
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echo "[✗] UNIX_SOCKET_PATH environment variable is required"
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exit 1
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fi
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if [ -z "$HOST_SOCKET_PATH" ]; then
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echo "ERROR: HOST_SOCKET_PATH environment variable is required"
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echo "[✗] HOST_SOCKET_PATH environment variable is required"
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exit 1
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fi
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echo "Starting socat proxy..."
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echo "TCP target: $TARGET_HOST:$TARGET_PORT"
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echo "HOST path: $HOST_SOCKET_PATH"
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echo "[~] Starting socat proxy..."
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echo "[i] TCP target: $TARGET_HOST:$TARGET_PORT"
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echo "[i] HOST path: $HOST_SOCKET_PATH"
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# Calculate full socket path
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echo "Full host socket path: $FULL_HOST_SOCKET_PATH"
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echo "Full socket path: $FULL_UNIX_SOCKET_PATH"
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echo "[i] Full host socket path: $FULL_HOST_SOCKET_PATH"
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echo "[i] Full socket path: $FULL_UNIX_SOCKET_PATH"
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# Check if socket file/folder exists and handle it
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if [ -e "$FULL_UNIX_SOCKET_PATH" ]; then
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echo "Socket file/folder $FULL_UNIX_SOCKET_PATH exists, removing it..."
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echo "[~] Socket file/folder $FULL_UNIX_SOCKET_PATH exists, removing it..."
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if rm -rf "$FULL_UNIX_SOCKET_PATH"; then
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echo "SUCCESS: Removed existing socket $FULL_UNIX_SOCKET_PATH"
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echo "[✓] Removed existing socket $FULL_UNIX_SOCKET_PATH"
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else
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echo "ERROR: Failed to remove existing socket $FULL_UNIX_SOCKET_PATH"
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echo "[✗] Failed to remove existing socket $FULL_UNIX_SOCKET_PATH"
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exit 1
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fi
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fi
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@@ -62,37 +74,37 @@ fi
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echo "Creating socket directory structure..."
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# Create directory if needed
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if mkdir -p "$UNIX_SOCKET_PATH"; then
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echo "SUCCESS: Created directory $UNIX_SOCKET_PATH"
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echo "[✓] Created directory $UNIX_SOCKET_PATH"
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else
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echo "ERROR: Failed to create directory $UNIX_SOCKET_PATH"
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echo "[✗] Failed to create directory $UNIX_SOCKET_PATH"
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exit 1
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fi
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echo "Creating socket with netcat..."
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# Create socket with nc -lU in background and then kill it to create the socket file
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if timeout 1 nc -lU "$FULL_UNIX_SOCKET_PATH" 2>/dev/null || true; then
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echo "SUCCESS: Socket created at $FULL_UNIX_SOCKET_PATH"
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echo "[✓] Socket created at $FULL_UNIX_SOCKET_PATH"
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else
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echo "WARNING: Socket creation with netcat had issues, but continuing..."
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echo "[!] Socket creation with netcat had issues, but continuing..."
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fi
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echo "Testing connection to target..."
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# Test if we can reach the target before starting socat
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if ! nc -z "$TARGET_HOST" "$TARGET_PORT" 2>/dev/null; then
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echo "WARNING: Cannot connect to $TARGET_HOST:$TARGET_PORT - socat will retry automatically"
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echo "[!] Cannot connect to $TARGET_HOST:$TARGET_PORT - socat will retry automatically"
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else
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echo "SUCCESS: Connection to $TARGET_HOST:$TARGET_PORT is working"
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echo "[✓] Connection to $TARGET_HOST:$TARGET_PORT is working"
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fi
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# Signal handler for graceful shutdown
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cleanup() {
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echo "Received SIGTERM, shutting down gracefully..."
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echo "[!] Received SIGTERM, shutting down gracefully..."
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if [ ! -z "$SOCAT_PID" ]; then
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echo "Stopping socat process (PID: $SOCAT_PID)..."
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echo "[~] Stopping socat process (PID: $SOCAT_PID)..."
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kill "$SOCAT_PID" 2>/dev/null || true
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wait "$SOCAT_PID" 2>/dev/null || true
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fi
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echo "Cleanup completed, exiting..."
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echo "[ ] Cleanup completed, exiting..."
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exit 0
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}
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@@ -103,10 +115,10 @@ echo "Starting socat proxy..."
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# Start socat with verbose logging and redirect to stdout/stderr
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if socat -d -d UNIX-LISTEN:$FULL_UNIX_SOCKET_PATH,fork,unlink-early TCP:$TARGET_HOST:$TARGET_PORT & then
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SOCAT_PID=$!
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echo "SUCCESS: Socat started with PID: $SOCAT_PID"
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echo "Container is ready and running..."
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echo "[✓] Socat started with PID: $SOCAT_PID"
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echo "[~] Container is ready and running..."
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else
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echo "ERROR: Failed to start socat proxy"
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echo "[✗] Failed to start socat proxy"
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exit 1
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fi
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@@ -115,6 +127,6 @@ while kill -0 "$SOCAT_PID" 2>/dev/null; do
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sleep 1
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done
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echo "Socat process has stopped"
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echo "[✓] Socat process has stopped"
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exit 1
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