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DNS-Tools.psm1
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DNS-Tools.psm1
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function Invoke-DNSTimeTest() {
Param(
[Parameter(
Mandatory=$False,
HelpMessage="Server to run Queries against",
Position=0
)]
[ValidateNotNullOrEmpty()]
[String] $Server,
[Parameter(
Mandatory=$False,
HelpMessage="Number of Queries to Run",
Position=1
)]
[ValidateNotNullOrEmpty()]
[Int] $NumberOfTests,
[Parameter(
Mandatory=$False,
HelpMessage="List of URLs to Query for test",
Position=3
)]
[ValidateNotNullOrEmpty()]
[String[]] $ListOfURLs,
[Parameter(
Mandatory=$False,
HelpMessage="Seconds between each query",
Position=4
)]
[ValidateNotNullOrEmpty()]
[Float] $TimeBetweenRequests,
[Parameter(
Mandatory=$False,
HelpMessage="Return JSON instead of Print",
Position=4
)]
[Switch] $ReturnJSON
)
Begin{
$totalMeasurement = 0
if (!$Server){
$Server = "8.8.8.8"
Write-Verbose "Using a default DNS server of 8.8.8.8 (Google DNS)"
}
if (!$NumberOfTests){
$NumberOfTests = 10;
Write-Verbose "Setting 10 as the number of tests.."
}
if(!$ListOfURLs){
$ListOfURLs = ("www.google.com","docs.microsoft.com","www.purple.com","nmsu.edu")
Write-Verbose "Setting Default list of URLs.."
}
if($TimeBetweenRequests -and $TimeBetweenRequests -le .5){
Write-Warning "DNS Packets this fast may be blocked by next-generation firewalls"
}elseif(!$TimeBetweenRequests){
$TimeBetweenRequests = .7
Write-Verbose "Setting default time between requests to .7 seconds"
}
$t = 1;
$totalNumberTests = $NumberOfTests * ($ListOfURLs.Length);
if ($env:TERM) { $Linux = $True }
}
Process{
$now = get-date -DisplayHint DateTime
for($i=1; $i -ile $NumberOfTests; $i++){
$percent = [Float]$t/$totalNumberTests * 100;
Write-Progress -Id 0 -Activity "Running name resolution test against $Server" -Status "Procedures Running:" -PercentComplete $percent
$ListOfURLs | ForEach-Object -Process {
$t++;
Write-Progress -Id 1 -ParentId 0 -Activity "Resolving $_ with $TimeBetweenRequests sec spacing between requests"
if ($Linux) {
$test = Measure-Command {dig -t A $_ @$Server}
}else{
$test = Measure-Command {Resolve-DnsName $_ -Server $Server -Type A}
}
$result = $test.TotalSeconds
$totalMeasurement += $result
Start-Sleep -Seconds $TimeBetweenRequests
}
}
}
End{
$average = $totalMeasurement / $NumberOfTests
if(!$ReturnJSON){
Write-Host "*******************************************************************"
Write-Host " Test Start Time: " $now
Write-Host " DNS Server: " $Server
Write-Host " Average Response Time (sec): " $average
Write-Host " Number of Queries: " $totalNumberTests
Write-Host "*******************************************************************"
}else{
$result = @{
Server=$Server;
AverageResponse=$average;
URLList=$ListOfURLs;
NumQueries=$NumberOfTests;
TimeBetweenQueries=$TimeBetweenRequests;
NumTests=$totalNumberTests;
TimeStamp=$now
} | ConvertTo-Json
return $result
}
}
}
Export-ModuleMember Invoke-DNSTimeTest