cloudflareDDNS-PowerShell

ddns_cf.ps1

Param(
  [Parameter(Mandatory = $true)] [string] $Token,
  [Parameter(Mandatory = $true)] [string] $Zone,
  [Parameter(Mandatory = $false)] [string] $RecordNameV4,
  [Parameter(Mandatory = $false)] [string] $RecordNameV6
)

# add Scheduled Task
# At computer startup
# Every 2 hours
# When connecting to the network
# Program/script: 
# C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -Command "& 'C:\srv\ddns_cf.ps1' -Token 9U.... -Zone 019... -RecordNameV4 xxx.xxx.com -RecordNameV6 xxx.xxx.com"

# TTL in seconds (1=auto)
$RECORD_TTL="1"
$DATE=Get-Date -Format g
$CF_URI = 'https://api.cloudflare.com/client/v4/zones'
$CF_HEADER = @{"Content-Type" = "application/json"; "Authorization" = "Bearer $Token"}
# [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

function Write-Log {
    Param ($Text)
    Write-Host ($DATE + ", " + $Text)
}

function Get-CF-Record {
    Param (
        [Parameter(Mandatory = $true)] [string] $RecordType,
        [Parameter(Mandatory = $true)] [string] $RecordName
    )
    $Uri = "${CF_URI}/${Zone}/dns_records?name=${RecordName}&type=${RecordType}"
    try {
        $Response = Invoke-RestMethod -Uri $Uri -Headers $CF_HEADER
        return $Response.result        
    } catch {
        $Message = "ERROR on " + $RecordName + " Response: " + $_
        Write-Log $Message
    }
}

function Invoke-CF-Record {
    Param (
        [Parameter(Mandatory = $true)] [string] $Zone,
        [Parameter(Mandatory = $true)] [string] $RecordName,
        [Parameter(Mandatory = $true)] [string] $RecordType,
        [Parameter(Mandatory = $false)] [string] $RecordId,
        [Parameter(Mandatory = $true)] [string] $IP
    )
    $Uri = "${CF_URI}/${Zone}/dns_records"
    $Method = "POST"
    if ($RecordId) {
        $Uri = "${CF_URI}/${Zone}/dns_records/${RecordId}"
        $Method = "PUT"
    }
    $Body = @{"id" = $Zone; "type" = $RecordType; "name" = $RecordName; "content" = $IP; "ttl" = $RECORD_TTL; "proxied" = $FALSE} | ConvertTo-Json
    try {
        $Response = Invoke-RestMethod -Method $Method -Uri $Uri -Headers $CF_HEADER -Body $Body
    } catch {
        $Message = "ERROR on " + $RecordName + " Response: " + $_
        Write-Log $Message
    }
}

function Invoke-CF-IP {
    Param (
        [Parameter(Mandatory = $true)] [string] $Zone,
        [Parameter(Mandatory = $true)] [string] $RecordType,
        [Parameter(Mandatory = $true)] [string] $RecordName,
        [Parameter(Mandatory = $true)] [string] $IP
    )

    $record = Get-CF-Record -RecordType A -RecordName $RecordName
    if ($record) {
        if (-Not ($IP -eq $record.content)) {
            try {
                Invoke-CF-Record -Zone $Zone -RecordName $RecordName -RecordType $RecordType -RecordId $record.id -IP $IP
            } catch {
                Write-Log "Update Record ${RecordType} fail"
            }            
        }
    } else {
        try {
            Invoke-CF-Record -Zone $Zone -RecordName $RecordName -RecordType $RecordType -IP $IP
        } catch {
            Write-Log "Update Record ${RecordType} fail"
        }
    }
}

function Get-Public-IP {
    Write-Log "Check IP Address"
    $linkIpList = Get-NetIPAddress -AddressState Preferred -PrefixOrigin Dhcp,RouterAdvertisement
    $linkIpv4List = $linkIpList |? -m AddressFamily IPv4
    $linkIpv6List = $linkIpList |? -m AddressFamily IPv6 |? -m SuffixOrigin Link
    if ($linkIpv4List) { $linkIpv4 = $linkIpv4List.IPAddress }
    if ($linkIpv6List) { $linkIpv6 = $linkIpv6List.IPAddress }
    Write-Log ("Device Link IPv4 Address: " + $linkIpv4)
    Write-Log ("Device Link IPv6 Address: " + $linkIpv6)

    try {
        $ip = Invoke-RestMethod "https://api.ipify.org"
        $publicIpv4 = $ip.Trim()
        Write-Log ("Device Public IPv4 Address: " + $publicIpv4)    
    } catch {
        Write-Log "Get Public Ipv4 fail"
    }

    return { "v4" = $publicIpv4; "v6" = $linkIpv6 }
}

$ip = Get-Public-IP
# update
if ($RecordNameV4) { Invoke-CF-IP -Zone $Zone -RecordType A -RecordName $RecordNameV4 -IP $ip.v4 }
if ($RecordNameV6) { Invoke-CF-IP -Zone $Zone -RecordType AAAA -RecordName $RecordNameV6 -IP $ip.v6 }