112 lines
3.2 KiB
Bash
112 lines
3.2 KiB
Bash
#!/bin/sh
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set -e
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# Set default values if not provided
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TARGET_HOST=${TARGET_HOST}
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TARGET_PORT=${TARGET_PORT}
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UNIX_SOCKET_PATH=${UNIX_SOCKET_PATH}
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UNIX_SOCKET_NAME=$(basename "$UNIX_SOCKET_PATH")
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HOST_SOCKET_PATH=${HOST_SOCKET_PATH}
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# Validate required environment variables
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if [ -z "$TARGET_HOST" ]; then
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echo "ERROR: TARGET_HOST environment variable is required"
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exit 1
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fi
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if [ -z "$TARGET_PORT" ]; then
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echo "ERROR: TARGET_PORT environment variable is required"
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exit 1
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fi
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if [ -z "$UNIX_SOCKET_PATH" ]; then
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echo "ERROR: UNIX_SOCKET_PATH environment variable is required"
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exit 1
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fi
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if [ -z "$HOST_SOCKET_PATH" ]; then
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echo "ERROR: HOST_SOCKET_PATH environment variable is required"
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exit 1
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fi
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echo "Starting socat proxy..."
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echo "UNIX socket: $UNIX_SOCKET_PATH"
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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 "Socket name: $UNIX_SOCKET_NAME"
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# Calculate full socket path
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FULL_SOCKET_PATH="$HOST_SOCKET_PATH/$UNIX_SOCKET_NAME"
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echo "Full socket path: $FULL_SOCKET_PATH"
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# Check if socket file/folder exists and handle it
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if [ -e "$FULL_SOCKET_PATH" ]; then
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echo "Socket file/folder $FULL_SOCKET_PATH exists, removing it..."
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if rm -rf "$FULL_SOCKET_PATH"; then
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echo "SUCCESS: Removed existing socket $FULL_SOCKET_PATH"
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else
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echo "ERROR: Failed to remove existing socket $FULL_SOCKET_PATH"
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exit 1
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fi
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fi
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echo "Creating socket directory structure..."
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# Create directory if needed
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if mkdir -p "$HOST_SOCKET_PATH"; then
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echo "SUCCESS: Created directory $HOST_SOCKET_PATH"
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else
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echo "ERROR: Failed to create directory $HOST_SOCKET_PATH"
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exit 1
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fi
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echo "Creating socket with netcat..."
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# Create socket with nc -lU in background and then kill it to create the socket file
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if timeout 1 nc -lU "$FULL_SOCKET_PATH" 2>/dev/null || true; then
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echo "SUCCESS: Socket created at $FULL_SOCKET_PATH"
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else
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echo "WARNING: Socket creation with netcat had issues, but continuing..."
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fi
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echo "Testing connection to target..."
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# Test if we can reach the target before starting socat
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if ! nc -z "$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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else
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echo "SUCCESS: 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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if [ ! -z "$SOCAT_PID" ]; then
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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 "$SOCAT_PID" 2>/dev/null || true
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fi
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echo "Cleanup completed, exiting..."
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exit 0
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}
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# Set up signal trap
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trap cleanup SIGTERM SIGINT
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echo "Starting socat proxy..."
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# Start socat with verbose logging and redirect to stdout/stderr
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if socat -d -d UNIX-LISTEN:$FULL_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: $SOCAT_PID"
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echo "Container is ready and running..."
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else
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echo "ERROR: Failed to start socat proxy"
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exit 1
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fi
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# Keep the script alive and wait for socat process
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while kill -0 "$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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exit 1
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