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Programming language: Go
License: Apache License 2.0
Latest version: v2.3.1

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 โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•—  โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•— โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•— โ–ˆโ–ˆโ–ˆโ•—   โ–ˆโ–ˆโ•—โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•—
โ–ˆโ–ˆโ•”โ•โ•โ•โ•โ• โ–ˆโ–ˆโ•”โ•โ•โ•โ–ˆโ–ˆโ•—โ–ˆโ–ˆโ•”โ•โ•โ–ˆโ–ˆโ•—โ–ˆโ–ˆโ–ˆโ–ˆโ•—  โ–ˆโ–ˆโ•‘โ–ˆโ–ˆโ•”โ•โ•โ•โ•โ•
โ–ˆโ–ˆโ•‘  โ–ˆโ–ˆโ–ˆโ•—โ–ˆโ–ˆโ•‘   โ–ˆโ–ˆโ•‘โ–ˆโ–ˆโ•‘  โ–ˆโ–ˆโ•‘โ–ˆโ–ˆโ•”โ–ˆโ–ˆโ•— โ–ˆโ–ˆโ•‘โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•—
โ–ˆโ–ˆโ•‘   โ–ˆโ–ˆโ•‘โ–ˆโ–ˆโ•‘   โ–ˆโ–ˆโ•‘โ–ˆโ–ˆโ•‘  โ–ˆโ–ˆโ•‘โ–ˆโ–ˆโ•‘โ•šโ–ˆโ–ˆโ•—โ–ˆโ–ˆโ•‘โ•šโ•โ•โ•โ•โ–ˆโ–ˆโ•‘
โ•šโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•”โ•โ•šโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•”โ•โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•”โ•โ–ˆโ–ˆโ•‘ โ•šโ–ˆโ–ˆโ–ˆโ–ˆโ•‘โ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ–ˆโ•‘
 โ•šโ•โ•โ•โ•โ•โ•  โ•šโ•โ•โ•โ•โ•โ• โ•šโ•โ•โ•โ•โ•โ• โ•šโ•โ•  โ•šโ•โ•โ•โ•โ•šโ•โ•โ•โ•โ•โ•โ•

[Apache licensed][10] Docker Go Report Card Cover.Run GoDoc

GoDNS is a dynamic DNS (DDNS) client tool. It is a rewrite in Go of my early DynDNS open source project.

Currently supports updating A records for subdomains. Doesn't support updating of root domains.

Supported DNS Providers

Provider IPv4 support IPv6 support Root Domain Subdomains
Cloudflare :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark:
Google Domains :white_check_mark: :white_check_mark: :x: :white_check_mark:
DNSPod :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark:
Dynv6 :white_check_mark: :white_check_mark: :x: :white_check_mark:
HE.net (Hurricane Electric) :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark:
AliDNS :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark:
DuckDNS :white_check_mark: :white_check_mark: :x: :white_check_mark:
Dreamhost :white_check_mark: :white_check_mark: :x: :white_check_mark:
No-IP :white_check_mark: :white_check_mark: :x: :white_check_mark:
Scaleway :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark:
Linode :white_check_mark: :white_check_mark: :white_check_mark: :white_check_mark:

Tip: You can follow this issue to view the current status of DDNS for root domains.

Supported Platforms

  • Linux
  • MacOS
  • ARM Linux (Raspberry Pi, etc.)
  • Windows
  • MIPS32 platform

To compile binaries for MIPS (mips or mipsle), run:

  GOOS=linux GOARCH=mips/mipsle GOMIPS=softfloat go build -a

The binary can run on routers as well.

Pre-conditions

To use GoDNS, it is assumed:

  • You registered (now own) a domain
  • Domain was delegated to a supported DNS provider (i.e. it has nameserver NS records pointing at a supported provider)

Alternatively, you can sign in to DuckDNS (with a social account) and get a subdomain on the duckdns.org domain for free.

Installation

Build GoDNS by running (from the root of the repository):

cd cmd/godns        # go to the GoDNS directory
go mod download     # get dependencies
go build            # build

You can also download a compiled binary from the releases.

Usage

Print usage/help by running:

$ ./godns -h
Usage of ./godns:
  -c string
        Specify a config file (default "./config.json")
  -h    Show help

Configuration

Overview

  • Make a copy of [config_sample.json](configs/config_sample.json) and name it as config.json, or make a copy of [config_sample.yaml](configs/config_sample.yaml) and name it as config.yaml.
  • Configure your provider, domain/subdomain info, credentials, etc.
  • Configure a notification medium (e.g. SMTP to receive emails) to get notified when your IP address changes
  • Place the file in the same directory of GoDNS or use the -c=path/to/your/file.json option

Configuration file format

GoDNS supports 2 different configuration file formats:

  • JSON
  • YAML

By default, GoDNS uses JSON config file. However, you can specify to use the YAML format via: ./godns -c /path/to/config.yaml

Configuration properties

  • provider โ€” One of the supported provider to use: Cloudflare, Google, DNSPod, AliDNS, HE, DuckDNS or Dreamhost.
  • email โ€” Email or account name of the DNS provider.
  • password โ€” Password of the DNS provider.
  • login_token โ€” API token of the DNS provider.
  • domains โ€” Domains list, with your sub domains.
  • ip_urls โ€” A URL array for fetching one's public IPv4 address.
  • ipv6_urls โ€” A URL array for fetching one's public IPv6 address.
  • ip_type โ€” Switch deciding if IPv4 or IPv6 should be used (when supported). Available values: IPv4 or IPv6.
  • interval โ€” How often (in seconds) the public IP should be updated.
  • socks5_proxy โ€” Socks5 proxy server.
  • resolver โ€” Address of a public DNS server to use. For instance to use Google's public DNS, you can set 8.8.8.8 when using GoDNS in IPv4 mode or 2001:4860:4860::8888 in IPv6 mode.

Update root domain

By simply putting @ into sub_domains, for example:

"domains": [{
      "domain_name": "example.com",
      "sub_domains": ["@"]
    }]

Configuration examples

Cloudflare

For Cloudflare, you need to provide the email & Global API Key as password (or to use the API token) and config all the domains & subdomains.

By setting the option proxied = true, the record is receiving the performance and security benefits of Cloudflare. This option is only available for Cloudflare.

Using email & Global API Key

{
  "provider": "Cloudflare",
  "email": "[email protected]",
  "password": "Global API Key",
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","test"]
    },{
      "domain_name": "example2.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "socks5_proxy": "",
  "proxied": false
}

Using the API Token

{
  "provider": "Cloudflare",
  "login_token": "API Token",
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","test"]
    },{
      "domain_name": "example2.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "socks5_proxy": ""
}

DNSPod

For DNSPod, you need to provide your API Token(you can create it here), and config all the domains & subdomains.

Example

{
  "provider": "DNSPod",
  "login_token": "your_id,your_token",
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","test"]
    },{
      "domain_name": "example2.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "socks5_proxy": ""
}

Dreamhost

For Dreamhost, you need to provide your API Token(you can create it here), and config all the domains & subdomains.

Example

{
  "provider": "Dreamhost",
  "login_token": "your_api_key",
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","test"]
    },{
      "domain_name": "example2.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "resolver": "ns1.dreamhost.com",
  "socks5_proxy": ""
}

Dynv6

For Dynv6, only need to provide the token, config 1 default domain & subdomains.

Example

{
  "provider": "Dynv6",
  "password": "",
  "login_token": "1234567ABCDEFGabcdefg123456789",
  "domains": [
    {
      "domain_name": "dynv6.net",
      "sub_domains": [
        "myname"
      ]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "socks5_proxy": ""
}

Google Domains

For Google Domains, you need to provide email & password, and config all the domains & subdomains.

Example

{
  "provider": "Google",
  "email": "Your_Username",
  "password": "Your_Password",
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","test"]
    },{
      "domain_name": "example2.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "socks5_proxy": ""
}

AliDNS

For AliDNS, you need to provide AccessKeyID & AccessKeySecret as email & password, and config all the domains & subdomains.

Example

{
  "provider": "AliDNS",
  "email": "AccessKeyID",
  "password": "AccessKeySecret",
  "login_token": "",
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","test"]
    },{
      "domain_name": "example2.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "socks5_proxy": ""
}

DuckDNS

For DuckDNS, the only thing needed is to provide the token, config 1 default domain & subdomains.

Example

{
  "provider": "DuckDNS",
  "password": "",
  "login_token": "3aaaaaaaa-f411-4198-a5dc-8381cac61b87",
  "domains": [
    {
      "domain_name": "www.duckdns.org",
      "sub_domains": [
        "myname"
      ]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "socks5_proxy": ""
}

No-IP

Example

{
  "provider": "NoIP",
  "email": "[email protected]",
  "password": "YourPassword",
  "domains": [
    {
      "domain_name": "ddns.net",
      "sub_domains": ["timothyye6"]
    }
  ],
  "ip_type": "IPv4",
  "ip_urls": ["https://api.ip.sb/ip"],
  "resolver": "8.8.8.8",
  "interval": 300,
  "socks5_proxy": ""
}

HE.net

For HE, email is not needed, just fill the DDNS key as password, and config all the domains & subdomains.

Example

{
  "provider": "HE",
  "password": "Your DDNS Key",
  "login_token": "",
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","test"]
    },{
      "domain_name": "example2.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300,
  "socks5_proxy": ""
}

Provider configuration

Add a new "A record" and make sure that "Enable entry for dynamic dns" is checked:

Fill in your own DDNS key or generate a random DDNS key for this new created "A record":

Remember the DDNS key and set it in the password property in the configuration file.

NOTICE: If you have multiple domains or subdomains, make sure their DDNS key are the same.

Scaleway

For Scaleway, you need to provide an API Secret Key as the login_token (How to generate an API key), and configure the domains and subdomains. domain_name should equal a DNS zone, or the root domain in Scaleway. TTL for the DNS records will be set to the interval value. Make sure A or AAAA records exist for the relevant sub domains, these can be set up in the Scaleway console.

Example

{
  "provider": "Scaleway",
  "login_token": "API Secret Key",
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","@"]
    },{
      "domain_name": "samplednszone.example.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300
}

Linode

To authenticate with the Linode API you will need to provide a Personal Access Token with "Read/Write" access on the "Domain" scope. Linode has a help page about creating access tokens. Pass this token into the login_token field of the config file.

The domain_name field of the config file must be the name of an existing Domain managed by Linode. Linode has a help page about adding domains. The GoDNS Linode handler will not create domains automatically, but will create subdomains automatically.

The GoDNS Linode handler currently uses a fixed TTL of 30 seconds for Linode DNS records.

Example

{
  "provider": "Linode",
  "login_token": ${PERSONAL_ACCESS_TOKEN},
  "domains": [{
      "domain_name": "example.com",
      "sub_domains": ["www","@"]
    },{
      "domain_name": "samplednszone.example.com",
      "sub_domains": ["www","test"]
    }
  ],
  "resolver": "8.8.8.8",
  "ip_urls": ["https://api.ip.sb/ip"],
  "ip_type": "IPv4",
  "interval": 300
}

Notifications

GoDNS can send a notification each time the IP changes.

Email

Emails are sent over SMTP. Update your configuration with the following snippet:

  "notify": {
    "mail": {
      "enabled": true,
      "smtp_server": "smtp.example.com",
      "smtp_username": "user",
      "smtp_password": "password",
      "smtp_port": 25,
      "send_to": "[email protected]"
    }
  }

Each time the IP changes, you will receive an email like that:

Telegram

To receive a Telegram message each time the IP changes, update your configuration with the following snippet:

  "notify": {
    "telegram": {
      "enabled": true,
      "bot_api_key": "11111:aaaa-bbbb",
      "chat_id": "-123456",
      "message_template": "Domain *{{ .Domain }}* is updated to %0A{{ .CurrentIP }}",
      "use_proxy": false
    },
  }

The message_template property supports markdown. New lines needs to be escaped with %0A.

Slack

To receive a Slack message each time the IP changes, update your configuration with the following snippet:

  "notify": {
    "slack": {
      "enabled": true,
      "bot_api_token": "xoxb-xxx",
      "channel": "your_channel",
      "message_template": "Domain *{{ .Domain }}* is updated to \n{{ .CurrentIP }}",
      "use_proxy": false
    },
  }

The message_template property supports markdown. New lines needs to be escaped with \n.

Discord

To receive a Discord message each time the IP changes, update your configuration with the following snippit:

  "notify": {
    "discord": {
          "enabled": true,
          "bot_api_token": "discord_bot_token",
          "channel": "your_channel",
          "message_template": "(Optional) Domain *{{ .Domain }}* is updated to \n{{ .CurrentIP }}",
        }
  }

Pushover

To receive a Pushover message each time the IP changes, update your configuration with the following snippet:

  "notify": {
    "pushover": {
      "enabled": true,
      "token": "abcdefghijklmnopqrstuvwxyz1234",
      "user": "abcdefghijklmnopqrstuvwxyz1234",
      "message_template": "",
      "device": "",
      "title": "",
      "priority": 0,
      "html": 1
    }
  }

The message_template property supports html if the html parameter is 1. If it is left empty a default message will be used. If the device and title parameters are left empty, Pushover will choose defaults see. More details on the priority parameter can be found on the Pushover API description.

Webhook

Webhook is another feature that GoDNS provides to deliver notifications to the other applications while the IP is changed. GoDNS delivers a notification to the target URL via an HTTP GET or POST request.

The configuration section webhook is used for customizing the webhook request. In general, there are 2 fields used for the webhook request:

  • url: The target URL for sending webhook request.
  • request_body: The content for sending POST request, if this field is empty, a HTTP GET request will be sent instead of the HTTP POST request.

Available variables:

  • Domain: The current domain.
  • IP: The new IP address.
  • IPType: The type of the IP: IPV4 or IPV6.

Webhook with HTTP GET reqeust

"webhook": {
  "enabled": true,
  "url": "http://localhost:5000/api/v1/send?domain={{.Domain}}&ip={{.CurrentIP}}&ip_type={{.IPType}}",
  "request_body": ""
}

For this example, a webhook with query string parameters will be sent to the target URL: 

http://localhost:5000/api/v1/send?domain=ddns.example.com&ip=192.168.1.1&ip_type=IPV4

Webhook with HTTP POST request

"webhook": {
  "enabled": true,
  "url": "http://localhost:5000/api/v1/send",
  "request_body": "{ \"domain\": \"{{.Domain}}\", \"ip\": \"{{.CurrentIP}}\", \"ip_type\": \"{{.IPType}}\" }"
}

For this example, a webhook will be triggered when the IP changes, the target URL http://localhost:5000/api/v1/send will receive an HTTP POST request with request body:

{ "domain": "ddns.example.com", "ip": "192.168.1.1", "ip_type": "IPV4" }

Miscellaneous topics

IPv6 support

Most of the providers support IPv6.

To enable the IPv6 support of GoDNS, there are two solutions to choose from:

  1. Use an online service to lookup the external IPv6

For that:

  • Set the ip_type as IPv6, and make sure the ipv6_urls is configured
  • Create an AAAA record instead of an A record in your DNS provider

Configuration example

   {
     "domains": [
       {
         "domain_name": "example.com",
         "sub_domains": [
           "ipv6"
         ]
       }
     ],
     "resolver": "2001:4860:4860::8888",
     "ipv6_urls": ["https://api-ipv6.ip.sb/ip"],
     "ip_type": "IPv6"
   }
  1. Let GoDNS find the IPv6 of the network interface of the machine it is running on (more on that later).

For this to happen, just leave ip_urls and ipv6_urls empty.

Note that the network interface must be configured with an IPv6 for this to work.

Network interface IP address

For some reasons if you want to get the IP address associated to a network interface (instead of performing an online lookup), you can specify it in the configuration file this way:

  "ip_urls": [""],
  "ip_interface": "interface-name",

With interface-name replaced by the name of the network interface, e.g. eth0 on Linux or Local Area Connection on Windows.

Note: If ip_urls is also specified, it will be used to perform an online lookup first and the network interface IP will be used as a fallback in case of failure.

SOCKS5 proxy support

You can make all remote calls go through a SOCKS5 proxy by specifying it in the configuration file this way:

"socks5_proxy": "127.0.0.1:7070"
"use_proxy": true

Display debug info

To display debug info, set debug_info as true to enable this feature. By default, the debug info is disabled.

  "debug_info": true,

Recommended APIs

Running GoDNS

There are a few ways to run GoDNS.

Manually

Note: make sure to set the run_once parameter in your config file so the program will quit after the first run (the default is false).

Can be added to cron or attached to other events on your system.

{
  "...": "...",
  "run_once": true
}

Then run

./godns

As a manual daemon

nohup ./godns &

Note: when the program stops, it will not be restarted.

As a managed daemon (with upstart)

  1. Install upstart first (if not available already)
  2. Copy ./upstart/godns.conf to /etc/init (and tweak it to your needs)
  3. Start the service:
   sudo start godns

As a managed daemon (with systemd)

  1. Install systemd first (it not available already)
  2. Copy ./systemd/godns.service to /lib/systemd/system (and tweak it to your needs)
  3. Start the service:
   sudo systemctl enable godns
   sudo systemctl start godns

As a Docker container

Available docker registries:

Visit https://hub.docker.com/r/timothyye/godns to fetch the latest docker image.
With /path/to/config.json your local configuration file, run:

docker run \
-d --name godns --restart=always \
-v /path/to/config.json:/config.json \
timothyye/godns:latest

As a Windows service

  1. Download the latest version of NSSM

  2. In an administrative prompt, from the folder where NSSM was downloaded, e.g. C:\Downloads\nssm\ win64, run:

   nssm install YOURSERVICENAME

  1. Follow the interface to configure the service. In the "Application" tab just indicate where the godns.exe file is. Optionally you can also define a description on the "Details" tab and define a log file on the "I/O" tab. Finish by clicking on the "Install service" button.

  2. The service will now start along Windows.

Note: you can uninstall the service by running:

nssm remove YOURSERVICENAME

Special Thanks

Thanks JetBrains for sponsoring this project with free open source license.

I like GoLand, it is an amazing and productive tool.


*Note that all licence references and agreements mentioned in the GoDNS README section above are relevant to that project's source code only.