Problems with PowerShell script on Invoke-WebRequest for HEnet IPv6 DDNS

Question

Problems with PowerShell script on Invoke-WebRequest for HEnet IPv6 DDNS

sebholz 1

Hi, I'm trying to develope a PowerShell script for a dynamic update service on Hurricane Electric service (aka HEnet) on IPv6 AAAA records. I have problems with the Invoke-WebRequest when applying the update, don't know what I'm doing wrong here.
This is my code:

   # Set static content  
   $myPass = "thepassword"  
   $myHost = "thedyn.domain.com"  
   $myWan = "Ethernet"  
     
   #Write-Eventlog  -Logname 'Application' -Source 'HEnet Updater' -EventID 666 -EntryType Information -Message "Starting…"  
     
   # Fetch external IP  
   Write-Host "Fetching external IP..."  
   $response = Get-NetIPAddress -AddressFamily IPv6 -InterfaceAlias "$myWan" -SuffixOrigin "Link" -PrefixOrigin "RouterAdvertisement"  
   $myIP = $response.IPAddress.Trim()  
     
   Write-Host "Value $myIP found, validating..."  
     
   # Validating IP  
   $IPCheck = [bool]("$myIP" -as [ipaddress])  
   Write-Host "Validation result: $IPCheck $myIP"  
     
   If ($IPCheck -eq $false)  
   {  
   Write-Host "Failed to get external IP. Trying with external method."  
     
   $myIP = (Invoke-WebRequest -Uri "http://checkipv6.dyndns.com").Content -replace "(<html><head><title>Current IP Check</title></head><body>Current IP Address: )|(</body></html>)|",""  
   Write-Host "Value $myIP found, assuming as external IP."  
     
   Exit  
   }  
     
   Write-Host "External IP: $myIP"  
     
   # Build URL for update  
   $URL = "http://${myHost}:${myPass}@dyn.dns.he.net/nic/update?hostname=$myHost&myip=$myIP"  
     
   # Print output  
   Write-Host "Updating host $myHost with IP $myIP"  
     
   # Updated  
   $update = Invoke-WebRequest $URL  
     
   # Write to EventLog  
   $strToLog = "Error returned: $update'r'nFull HTTPS string used: $URL"  
   Write-Host "Writing to log: $strToLog"  
   #Write-Eventlog  -Logname 'Application' -Source 'No-IP Updater' -EventID 666 -EntryType Information -Message $strToLog

5 answers

Your answer

Answer 1

MotoX80 36,291

What error are you getting? What response do you get from the web site?

Is $myIP correct? Display the contents of the $url variable before you call invoke-webrequest. Display the contents of the $update variable after the call.

Answer 2

sebholz 1

Hi @MotoX80 , thanks for answering!

Yes $myIP is correct, its a IPv6 address and the outpu in this case is 2xxx:xxxx:xxxx:xxxx:b4e7:4193:4d0c:914b also the script does run a validation on:
$IPCheck = [bool]("$myIP" -as [ipaddress])
Write-Host "Validation result: $IPCheck $myIP"

The $url content is: http://thedyn.domain.com:thepassword[@](/users/na/?userId=9caf6c8e-0000-0003-0000-000000000000).dns.he.net/nic/update?hostname=thedyn.domain.com&myip=2xxx:xxxx:xxxx:xxxx:b4e7:4193:4d0c:914b

As described by dns.he.net website, also if you use this address on a browser it does work.

The result after invoking that address is:
Invoke-WebRequest : El servidor ha cometido una infracción de protocolo. Section=ResponseStatusLine
En C:\Users\Usuario\noip.ps1: 45 Carácter: 11

$update = Invoke-WebRequest "$URL"
~~~~~~~~~~~~~~~~~~~~~~~~
CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebException
FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

Rich Matheisen 47,901 Reputation points

2022-07-22T02:15:15.08+00:00

What's in the StatusCode property of the $result variable?

There may be missing headers in the request. Or perhaps you need to add "-Method POST" to the Invoke-WebRequest.

Probably the best way to see exactly what is happening is to use either Fiddler (fiddler) or tcpTrace (open-tcptrace). If the connection doesn't use HTTPS you may be able to just to WireShark (www.wireshark.org) to capture the packets.
Rich Matheisen 47,901 Reputation points

2022-07-23T02:14:28.96+00:00
FYI, I don't use DYN's services any longer, so I have no account with which to get past the authentication on the site. At this point it's not possible for me to offer any more help. I did try using Fiddler to see what's happening.

I'll offer one question though: Have you tried removing the "hostname:password@" from the URL and instead provided a credential with "-Credential" parameter of the Invoke-WebRequest cmdlet? I know that using the *nix "curl" utility, the user and password are passed as individual parameters. here's an example:

result=$(curl -$1 -s -m 5 "https://dyn.dns.he.net/nic/update" -d "hostname=$2" -d "password=$3")

Answer 3

MotoX80 36,291

Try changing the URL to HTTPS.

# Build URL for update  
$URL = "https://${myHost}:${myPass}@dyn.dns.he.net/nic/update?hostname=$myHost&myip=$myIP"

Answer 4

sebholz 1

Hi, I have already tryed that.
Also by replacing the line with:

(Invoke-WebRequest -Uri "$URL").Content
Invoke-WebRequest -Method GET -Uri "$URL"
Invoke-RestMethod -Uri "$URL"

Even in each case, with http or https.

Answer 5

So, I was able to figure it out in some way, with Wireshark as @Rich Matheisen said I was able to capture the packets, the problem is that the reponse from the server was: 401 Authorization Required
Even if I place the credentials on the $URL on the part http://${myHost}:${myPass}@ there is still some required step and that is to acept the connection with such credentials!
So what I did, Ive change the $URL for:
$URL = "http://dyn.dns.he.net/nic/update?hostname=${myHost}&password=${myPass}&myip=${myIP}"

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Problems with PowerShell script on Invoke-WebRequest for HEnet IPv6 DDNS

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