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AzDynaDNS Function.ps1
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AzDynaDNS Function.ps1
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using namespace System.Net
param($Request, $TriggerMetadata)
############### Settings ##############
#Only used if Autodetection fails, e.g. multiple DNS zones, etc.
$ResourceGroup = "AzDynDNS"
$ZoneName = "Limenet.eu"
############### /Settings ##############
if (!$request.headers.authorization) {
write-host "No API key"
Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
StatusCode = [HttpStatusCode]::OK
Body = "badauth"
})
exit
}
$Base64APIKey = $request.headers.authorization -split " " | select-object -last 1
$APIKey = [Text.Encoding]::Utf8.GetString([Convert]::FromBase64String($Base64APIKey)) -split ":" | select-object -last 1
if ($APIKey -ne $env:APIKey) {
write-host "Invalid API key"
Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
StatusCode = [HttpStatusCode]::OK
Body = "badauth"
})
exit
}
$AutoDetect = (get-azresource -ResourceType "Microsoft.Network/dnszones")
If ($AutoDetect) {
write-host "Using Autodetect."
$ZoneName = $Autodetect.name
$ResourceGroup = $AutoDetect.ResourceGroupName
}
$Domain = $request.Query.hostname.split('.') | select-object -first 1
$NewIP = $request.Query.myip
write-host "$domain has $newip. Checking record and creating if required."
$ExistingRecord = Get-AzDnsRecordSet -ResourceGroupName $ResourceGroup -ZoneName $ZoneName -Name $Domain -RecordType A -ErrorAction SilentlyContinue
if (!$ExistingRecord) {
write-host "Creating new record for $domain"
New-AzDnsRecordSet -name $domain -Zonename $ZoneName -ResourceGroupName $ResourceGroup -RecordType A -Ttl 60 -DnsRecords (New-AzDnsRecordConfig -Ipv4Address $NewIP)
Push-OutputBinding -Name Response -Value ( [HttpResponseContext]@{
StatusCode = [HttpStatusCode]::OK
Body = "good $newip"
})
exit
}
else {
if ($ExistingRecord.Records[-1].Ipv4Address -ne $NewIP) {
write-host "Updating record for $domain - new IP is $newIP"
$ExistingRecord.Records[-1].Ipv4Address = $NewIP
Set-AzDnsRecordSet -RecordSet $ExistingRecord
Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
StatusCode = [HttpStatusCode]::OK
Body = "good $newip"
})
}
else {
write-host "No Change - $domain IP is still $newIP"
Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
StatusCode = [HttpStatusCode]::OK
Body = "nochg $NewIP"
})
}
exit
}