Register w/ Cloudflare DNS

README.md

Dynamic DNS w/ Cloudflare + PowerShell + Windows Scheduled Tasks

Copy registerCloudflare.ps1 to C:\tools\registerCloudflare.ps1

Scheduled Task

Pick a Trigger that makes sense for you. Some examples:

• At computer startup
• Every 6 hours
• When connecting to the network

Use the following for Actions

Program/script: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
-Command "& 'C:\tools\registerCloudflare.ps1' -Email 'user@example.com' -ApiKey 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX' -Domain 'example.com' -Name 'myfriendlyname'"

LICENSE

MIT License

Copyright (c) 2018 Noel Bundick

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

registerCloudflare.ps1

Param(
  [Parameter(Mandatory = $true)]
  [string] $Email,
  [Parameter(Mandatory = $true)]
  [string] $ApiKey,
  [Parameter(Mandatory = $true)]
  [string] $Domain,
  [Parameter(Mandatory = $true)]
  [string] $Name
)

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

$headers = @{
  "Content-Type"="application/json";
  "X-Auth-Key"=$ApiKey;
  "X-Auth-Email"=$Email;
}

$zone = Invoke-WebRequest -UseBasicParsing -Method GET -Headers $headers -Uri "https://api.cloudflare.com/client/v4/zones/" | ConvertFrom-Json | select -ExpandProperty result | ? { $_.name -eq $Domain }

$zoneId = $zone.id
$recordName = "$Name.$Domain"
$record = Invoke-WebRequest -UseBasicParsing -Method GET -Headers $headers -Uri "https://api.cloudflare.com/client/v4/zones/$zoneId/dns_records" | ConvertFrom-Json | select -ExpandProperty result | ? { $_.name -eq $recordName }

$publicIP = Invoke-RestMethod http://ipinfo.io/json | select -ExpandProperty ip
if ($record) {
  Write-Output "Updating DNS record"
  $recordId = $record.id
  $body = @{
    "type" = "A";
    "name" = $Name;
    "content" = $publicIP;
    "proxied" = $false
  }
  $json = ConvertTo-Json $body
  Invoke-WebRequest -UseBasicParsing -Method PUT -Headers $headers -Body $json -Uri "https://api.cloudflare.com/client/v4/zones/$zoneId/dns_records/$recordid" | ConvertFrom-Json | select -ExpandProperty result
} else {
  Write-Output "Creating new DNS record"
  $body = @{
    "type" = "A";
    "name" = $Name;
    "content" = $publicIP;
    "proxied" = $false
  }
  $json = ConvertTo-Json $body
  Invoke-WebRequest -UseBasicParsing -Method POST -Headers $headers -Body $json -Uri "https://api.cloudflare.com/client/v4/zones/$zoneId/dns_records" | ConvertFrom-Json | select -ExpandProperty result
}