Web interface for sending Wake-on-LAN (WoL magic packet)

A Golang based HTTP server which will send a Wake-on-LAN package (magic packet) on local network. The request can be sent using web interface or directly using HTTP request with mapped device name in the URL. The only computing device I have running 24x7 is handy-dandy Raspberry Pi 4 (4gb) with docker containers. All other devices like server, laptop and NAS as powered only when I need them. I needed a way to easily turn them on specifically when trying to automate things like nightly builds.

I use this application behind NGINX web proxy which is secured with HTTPS certificate. It has no authentication, but it is a home network and the reason I built this was to have no authentication. I have the same functionality provided in my home router, but I have to login and go through several clicks. Also, this app runs as docker image so even if it is hacked, it reduces the attack surface.

I have bookmarked direct link to device(s) on my browsers to wake them using single HTTP call for ease of access.

Things I use this for:

• to wake-up my home laptop remotely. I use my home laptop remotely over RDP.
• this is also helpful in building routines which will wake up my server and nightly builds and when it is all done, go back to sleep. I don't keep my home lab running 24x7 as it is a waste of energy.
• to turn on my NAS and laptop to start the weekly backup from laptop to NAS.
• to turn on NAS quickly when we are watching movies stored on NAS.

It was tricky to configure the wol feature on my Dell Laptop. NAS and Dell servers were easy to configure. Follow this article for Dell laptop

Bootstrap UI with JS Grid for editing data

The UI features CRUD operation implemented using js-grid.com plugin.

Wake-up directly using HTTP Request

/wolweb/wake/<hostname> - Returns a JSON object

{
  "success":true,
  "message":"Sent magic packet to device Server with Mac 34:E6:D7:33:12:71 on Broadcast IP 192.168.1.255:9",
  "error":null
}

Configure the app

The application will use the following default values if they are not explicitly configured as explained in sections below.

Config	Description	Default
Port	Define the port on which the webserver will listen	8089
Virtual Directory	A virtual directory to mount this application under	/wolweb
Broadcast IP and Port	This is broadcast IP address and port for the local network. Please include the port :9	192.168.1.255:9

You can override the default application configuration by using a config file or by setting environment variables. The application will first load values from config file and look for environment variables and overwrites values from the file with the values which were found in the environment.

Using config.json:

{
    "port": 8089,
    "vdir":"/wolweb",
    "bcastip":"192.168.1.255:9"
}

Using Environment Variables:

Environment variables takes precedence over values in config.json file.

Variable Name	Description
WOLWEBPORT	Override for default HTTP port
WOLWEBVDIR	Override for default virtual directory
WOLWEBBCASTIP	Override for broadcast IP address and port

Devices (targets) - devices.json format

{
    "devices": [
        {
            "name": "Server",
            "mac": "34:E6:D7:33:12:71",
            "ip": "192.168.1.255:9"
        },
        {
            "name": "NAS",
            "mac": "28:C6:8E:36:DC:38",
            "ip": "192.168.1.255:9"
        },
        {
            "name": "Laptop",
            "mac": "18:1D:EA:70:A0:21",
            "ip": "192.168.1.255:9"
        }
    ]
}

Usage with Docker

This project includes Dockerfile (based on Alpine) and docker-compose.yml files which you can use to build the image for your platform and run it using the docker compose file. If interested, I also have alternate Dockerfile (based on Debian). Both of these Dockerfile are tested to run on Raspberry Pi Docker CE. If you want to use this application as-is, you will only need to download these two docker-related files to get started. The docker file will grab the code and compile it for your platform.

I could not get this to run using Docker's bridged network. The only way I was able to make it work was to use host network for the docker container. See this docker/for-linux#637 for details.

With docker-compose

docker-compose up -d

Build and run manually

docker build -t wolweb .
docker run --network host -it wolweb

Extract the compiled application from an image

docker cp wolweb:/wolweb - > wolweb.gz

Build on Windows

I use VS Code with Go extension. To build this project on Windows:

go build -o wolweb.exe .

Build for ASUS Routers (ARM v5)

I initially thought of running this application on my router, so I needed to build the application without having to install build tool on my router. I use the following PowerShell one liner to build targeting the ARM v5 platform on my Windows machine with VS Code:

 $Env:GOOS = "linux"; $Env:GOARCH = "arm"; $Env:GOARM = "5"; go build -o wolweb .

Copy the file over to router and make it executable.

chmod +x wolweb

To see detailed instructions on how to run this application as service on ASUS router with custom firmware asuswrt-merlin see this Wiki guide

NGiNX Config

I am already using NGiNX as web-proxy for accessing multiple services (web interfaces) from single IP and port 443 using free Let's Encrypt HTTPS certificate. For accessing this service, I just added the following configuration under my existing server node.

	location /wolweb {
		proxy_pass http://192.168.1.4:8089/wolweb;
	}

This is also the reason why I have an option in this application to use virtual directory /wolweb as I can easily map all requests for this application. My / is already occupied for other web application in my network.

Credits

Thank you to David Baumann's project https://github.com/dabondi/go-rest-wol for providing the framework which I modified a little to work within constraints of environment.