DDNS Cloudflare for PowerShell

cloudflare-ddns.ps1

$dns_record = "<Write Here>"
$ttl = 120
$cloudflare_zoneid = "<Write Here>"
$cloudflare_api_token = "<Write Here>"
$log_filename = "ddns.log"

$log_file = "$PSScriptRoot\$log_filename"

Write-Output "INFO [$(Get-Date)] 更新処理を開始します。" | Tee-Object $log_file -Append

$ipv4 = (Invoke-WebRequest -uri 'http://ifconfig.me/ip').Content.Trim()
if (!([bool]$ipv4)) {
    Write-Output "ERROR [$(Get-Date)] IPv4アドレスの取得に失敗しました。" | Tee-Object $log_file -Append
    exit 1
}

$ipv6 = (Invoke-WebRequest -uri 'http://ifconfig.io/ip').Content.Trim()
if (!([bool]$ipv4)) {
    Write-Output "ERROR [$(Get-Date)] IPv6アドレスの取得に失敗しました。" | Tee-Object $log_file -Append
    exit 1
}


$dns_record_ipv4 = (Resolve-DnsName -Name $dns_record -Type A -Server sharon.ns.cloudflare.com).IPAddress
$dns_record_ipv6 = (Resolve-DnsName -Name $dns_record -Type AAAA -Server sharon.ns.cloudflare.com).IPAddress


if ($ipv4 -eq $dns_record_ipv4) {
    Write-Output "INFO [$(Get-Date)] IPv4アドレスが変更されていないため、更新は行いません。" | Tee-Object $log_file -Append
} else {
    Write-Output "INFO [$(Get-Date)] IPv4アドレスが変更されているため、更新を行います。" | Tee-Object $log_file -Append
    $record_info_ipv4_request = @{
        Uri = "https://api.cloudflare.com/client/v4/zones/$cloudflare_zoneid/dns_records?name=$dns_record&type=A"
        Headers = @{
            "Authorization" = "Bearer $cloudflare_api_token"
            "Content-Type" = "application/json"
        }
    }
    $record_info_ipv4_response = Invoke-RestMethod @record_info_ipv4_request
    if ($record_info_ipv4_response.success -ne "True") {
        Write-Output "ERROR [$(Get-Date)] Aレコード情報の取得に失敗しました。" | Tee-Object $log_file -Append
        exit 1
    }
    $record_id_ipv4 = $record_info_ipv4_response.result.id
    $update_dns_ipv4_request = @{
        Uri = "https://api.cloudflare.com/client/v4/zones/$cloudflare_zoneid/dns_records/$record_id_ipv4"
        Method = "PUT"
        Headers = @{
            "Authorization" = "Bearer $cloudflare_api_token"
            "Content-Type" = "application/json"
        }
        Body = @{
            "type" = "A"
            "name" = $dns_record
            "content" = $ipv4
            "ttl" = $ttl
        } | ConvertTo-Json
    }
    $update_dns_ipv4_response = Invoke-RestMethod @update_dns_ipv4_request
    if ($update_dns_ipv4_response.success -ne "True") {
        Write-Output "ERROR [$(Get-Date)] Aレコードの更新に失敗しました。" | Tee-Object $log_file -Append
        exit 1
    }
    Write-Output "INFO [$(Get-Date)] Aレコードの更新が完了しました。" | Tee-Object $log_file -Append
}

if ($ipv6 -eq $dns_record_ipv6) {
    Write-Output "INFO [$(Get-Date)] IPv6アドレスが変更されていないため、更新は行いません。" | Tee-Object $log_file -Append
} else {
    Write-Output "INFO [$(Get-Date)] IPv6アドレスが変更されているため、更新を行います。" | Tee-Object $log_file -Append
    $record_info_ipv6_request = @{
        Uri = "https://api.cloudflare.com/client/v4/zones/$cloudflare_zoneid/dns_records?name=$dns_record&type=AAAA"
        Headers = @{
            "Authorization" = "Bearer $cloudflare_api_token"
            "Content-Type" = "application/json"
        }
    }
    $record_info_ipv6_response = Invoke-RestMethod @record_info_ipv6_request
    if ($record_info_ipv6_response.success -ne "True") {
        Write-Output "ERROR [$(Get-Date)] Aレコード情報の取得に失敗しました。" | Tee-Object $log_file -Append
        exit 1
    }
    $record_id_ipv6 = $record_info_ipv6_response.result.id
    $update_dns_ipv6_request = @{
        Uri = "https://api.cloudflare.com/client/v4/zones/$cloudflare_zoneid/dns_records/$record_id_ipv6"
        Method = "PUT"
        Headers = @{
            "Authorization" = "Bearer $cloudflare_api_token"
            "Content-Type" = "application/json"
        }
        Body = @{
            "type" = "AAAA"
            "name" = $dns_record
            "content" = $ipv6
            "ttl" = $ttl
        } | ConvertTo-Json
    }
    $update_dns_ipv6_response = Invoke-RestMethod @update_dns_ipv6_request
    if ($update_dns_ipv6_response.success -ne "True") {
        Write-Output "ERROR [$(Get-Date)] AAAAレコードの更新に失敗しました。" | Tee-Object $log_file -Append
        exit 1
    }
    Write-Output "INFO [$(Get-Date)] AAAAレコードの更新が完了しました。" | Tee-Object $log_file -Append
}

Write-Output "INFO [$(Get-Date)] 更新処理が完了しました。" | Tee-Object $log_file -Append