Command Line Daemon

DNS proxy server you can run on a router, or any other device.

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In order to facilitate simple onboarding, on any type of device (with a keyboard) we've developed an open source command line daemon, known as ctrld. It can be used to configure a Control D Device with a single command, and it can do a whole bunch more.

Why Use This

You may want to use this utility in the following situations:

  • You operate a network, and have to use Legacy DNS for all your LAN clients
  • Want to use Secure DNS protocols on a device that does not support them
  • Want to create an advanced DNS routing policy
  • Want to see all your LAN clients, and create DNS policies for all of them via a web GUI
  • Want to deploy Secure DNS on a roaming client

Quick Install

The simplest way to start using ctrld is to run the installer. Open an terminal and execute this command as admin/system user on any Linux or UNIX-like OS (including MacOS):

sh -c 'sh -c "$(curl -sL https://api.controld.com/dl)" -s RESOLVER_ID_HERE'

Template RESOLVER_ID_HERE with your actual Resolver ID from the relevant Device.

If you'd like to use the same method on Windows, run this in admin cmd:

powershell -Command "(Invoke-WebRequest -Uri 'https://api.controld.com/dl' -UseBasicParsing).Content | Set-Content '%TEMP%\ctrld_install.bat'" && %TEMP%\ctrld_install.bat RESOLVER_ID_HERE

The above scripts will do the following:

  • Detect your OS and architecture
  • Present you with your system info and what it's about to do
  • Once you press y
    • Download the appropriate binary
    • Make it executable
    • Register a system service and start the DNS server
    • Modify the DNS settings on your network adapter to use the local server

In order to skip the interactive confirmation (y/n), simply append forced flag to the installer command. ie. -s RESOLVER_ID_HERE forced for MacOS and Linux, and RESOLVER_ID_HERE forced for Windows + PowerShell. This will perform the installation without any user confirmation or input.

Download Manually

Head over to Github, and download the version of the daemon for your platform. You can find builds for most operating systems in the Releases section.

Currently supported operating systems are:

  • Windows (386, AMD64 and ARM) - use the _windows builds
  • Mac (AMD64 and ARM) - use the _darwin builds
  • Linux (386, AMD64, ARM, MIPS) - use the _linux builds
  • FreeBSD (386, AMD64, ARM) - use the _freebsd builds

Get your resolver ID

When you create a Control D Device, you are issued a set of DNS resolvers. On the screen that shows you your resolvers, you will see "Resolver ID" at the top.

Windows

Start Service

Open Administrative command line, and navigate to the folder where the .exe file is extracted, and run this command. 

ctrld.exe start --cd RESOLVER_ID_HERE

This command will do the following:

  • Fetch your Device's configuration
  • Render a configuration file and store it in the HOME directory
  • Spawn a DNS listener and start a system service that will always run
  • Configure the DNS on the default interface to use the local DNS proxy server

Stop Service

In order to temporarily stop the Control D service, execute the following from Administrative command line:

ctrld.exe stop

🚧

Service is still installed

The above commands will stop the service, and unconfigure the listener it spawned from the default interface. If the system is rebooted, the original configuration will be restored automatically.

Uninstall Service

In order to permanently uninstall ctrld run these 2 commands. 

ctrld.exe stop
ctrld.exe uninstall

MacOS

Start Service

Open terminal, navigate to the folder where the binary file is extracted, and run this command. 

sudo ctrld start --cd RESOLVER_ID_HERE

This command will do the following:

  • Fetch your Device's configuration
  • Render a configuration file and store it in the HOME directory
  • Spawn a DNS listener and start a system service that will always run
  • Configure the DNS on the default interface to use the local DNS proxy server

Stop Service

In order to temporarily stop the Control D service, execute the following command with admin/sudo privilege:

sudo ctrld stop

🚧

Service is still installed

The above commands will stop the service, and unconfigure the listener it spawned from the default interface. If the system is rebooted, the original configuration will be restored automatically.

Uninstall Service

In order to permanently uninstall ctrld run these 2 commands.

sudo ctrld stop
sudo ctrld uninstall

Linux

Start Service

Open terminal, navigate to the folder where the binary file is extracted, and run this command. 

sudo ctrld start --cd RESOLVER_ID_HERE

This command will do the following:

  • Fetch your Device's configuration
  • Render a configuration file and store it in the HOME directory
  • Spawn a DNS listener and start a system service that will always run
  • Configure the DNS on the default interface to use the local DNS proxy server

Stop Service

In order to temporarily stop the Control D service, execute the following command with admin/sudo privilege:

sudo ctrld stop

🚧

Service is still installed

The above commands will stop the service, and unconfigure the listener it spawned from the default interface. If the system is rebooted, the original configuration will be restored automatically.

Uninstall Service

In order to permanently uninstall ctrld run these 2 commands.

sudo ctrld stop
sudo ctrld uninstall

Routers

ctrld currently supports the following routers and firmware:

  • ASUS Merlin
  • DD-WRT
  • Firewalla
  • Fresh Tomato
  • GL.iNet
  • OpenWRT
  • pfSense / OPNsense
  • Synology
  • Ubiquiti UDM, UDR, EdgeOS

All you have to do is SSH into your router and follow the Quick Install instructions at the top of this page. With a single command, you can start using Control D in literally seconds.

Remote Uninstallation

Simply delete the associated Device from the web control panel. This will break DNS on the machine that is using this Device's resolvers.

Then simply reboot the machine. On startup, the service will self-terminate and uninstall itself.

Do More

This is the most basic use of the ctrld daemon. It can do a whole lot more, especially if you run it on a router. What can you do with it? Here are some use cases:

  1. Create unique DNS routing policies based on source IP, device hostname or MAC address
  2. Split horizon DNS with wildcard rules
  3. Use Secure DNS protocols even for devices that don't support them (UDP53-to-DOH)
  4. Run multiple DNS listeners, with unique policies and variable upstreams
  5. Cache DNS records locally

For a full feature set, please check out the README.

Example Configs

Want to craft your own config? No problem, check out some examples.

Troubleshooting

Something not working? Check out the troubleshooting guide.

Updated 6 days ago