Private/AzStackHci.DNS.Helpers.ps1

# ////////////////////////////////////////////////////////////////////////////
# Strict Mode v1 (PS 5.1 safe) - surfaces reads of uninitialised variables at runtime.
Set-StrictMode -Version 1.0

function Get-DnsDiagnosticResolverPolicy {
    try {
        $policy = @(Get-DnsClientNrptPolicy -Effective -ErrorAction Stop)
        if ($policy.Count) { return [pscustomobject]@{ SkipReason = 'NamespacePolicyPresent'; Resolvers = @() } }
        $activeIndexes = @(Get-NetIPInterface -ErrorAction Stop | Where-Object { $_.ConnectionState -eq 'Connected' } | Select-Object -ExpandProperty InterfaceIndex -Unique)
        $configured = @(Get-DnsClientServerAddress -ErrorAction Stop | Where-Object { $_.InterfaceIndex -in $activeIndexes -and @($_.ServerAddresses).Count -gt 0 })
        $indexes = @($configured | Select-Object -ExpandProperty InterfaceIndex -Unique)
        if ($indexes.Count -ne 1) {
            $reason = if ($indexes.Count) { 'AmbiguousInterfaces' } else { 'NoEligibleResolvers' }
            return [pscustomobject]@{ SkipReason = $reason; Resolvers = @() }
        }
        $seen = @{}
        $resolvers = @(foreach ($configuration in $configured) {
            foreach ($server in $configuration.ServerAddresses) {
                if ($seen.ContainsKey([string]$server)) { continue }
                $seen[[string]$server] = $true
                $skipReason = $null
                try {
                    $routes = @(Find-NetRoute -RemoteIPAddress $server -ErrorAction Stop)
                    if (-not $routes.Count -or @($routes | Where-Object { $_.InterfaceIndex -ne $configuration.InterfaceIndex }).Count) { $skipReason = 'RouteMismatch' }
                } catch { $skipReason = 'RouteUnknown' }
                [pscustomobject]@{ DnsServer = [string]$server; InterfaceAlias = [string]$configuration.InterfaceAlias; SkipReason = $skipReason }
            }
        })
        return [pscustomobject]@{ SkipReason = $null; Resolvers = $resolvers }
    } catch {
        return [pscustomobject]@{ SkipReason = 'PolicyUnavailable'; Resolvers = @() }
    }
}

function Invoke-DnsDiagnosticQuery {
    param([string]$Name, [string]$Server)
    try {
        $records = @(Resolve-DnsName -Name $Name -Server $Server -Type A -DnsOnly -NoHostsFile -QuickTimeout -ErrorAction Stop)
        $addresses = @($records | Where-Object { $_.IPAddress } | ForEach-Object { [string[]]$_.IPAddress } | Select-Object -Unique)
        $status = if ($addresses.Count) { 'Success' } else { 'NoRecords' }
        return [pscustomobject]@{ Status = $status; Addresses = $addresses; ErrorCode = $null }
    } catch {
        $code = if ($_.Exception.PSObject.Properties['NativeErrorCode']) { [int]$_.Exception.NativeErrorCode } else { 0 }
        $status = switch ($code) {
            9003 { 'NXDOMAIN' }
            9501 { 'NoRecords' }
            1460 { 'Timeout' }
            10060 { 'Timeout' }
            9002 { 'ServerFailure' }
            9005 { 'Refused' }
            default { 'Error' }
        }
        return [pscustomobject]@{ Status = $status; Addresses = @(); ErrorCode = if ($code) { [string]$code } else { 'ResolutionError' } }
    }
}

function Add-ConnectivityDnsDiagnostics {
    [CmdletBinding()]
    param([AllowEmptyCollection()][object[]]$Rows, [datetime]$Deadline = [datetime]::UtcNow.AddSeconds(60))
    $cache = @{}
    $resolverPolicy = $null
    foreach ($row in $Rows) {
        if (-not $row.PSObject.Properties['DNSFailureCode'] -or -not $row.DNSFailureCode) { continue }
        $diagnostic = [pscustomobject]@{
            NormalResolutionStatus = 'Failed'; NormalResolutionErrorCode = [string]$row.DNSFailureCode
            CollectionStatus = 'Skipped'; SkipReason = $null; ResolverResults = @()
        }
        try {
            $hostname = (Get-DomainFromURL -url $row.URL).Domain.ToLowerInvariant().TrimEnd('.')
            if ($cache.ContainsKey($hostname)) {
                $prior = $cache[$hostname]
                $diagnostic.CollectionStatus = $prior.CollectionStatus
                $diagnostic.SkipReason = $prior.SkipReason
                $diagnostic.ResolverResults = @($prior.ResolverResults)
            } elseif ([datetime]::UtcNow -ge $Deadline) {
                $diagnostic.SkipReason = 'RunBudgetExceeded'
            } else {
                if ($null -eq $resolverPolicy) {
                    $policyDeadline = [datetime]::UtcNow.AddSeconds(10)
                    if ($policyDeadline -gt $Deadline) { $policyDeadline = $Deadline }
                    $snapshot = Invoke-JobWithAnimation -JobName ('DNS-policy-' + [guid]::NewGuid().ToString('N')) -Activity 'DNS diagnostics' -Deadline $policyDeadline -JobScriptBlock (Get-Command Get-DnsDiagnosticResolverPolicy).ScriptBlock
                    if ($snapshot.State -eq 'Completed' -and -not $snapshot.TimedOut -and @($snapshot.Output).Count -eq 1) {
                        $resolverPolicy = $snapshot.Output[0]
                    } else { $resolverPolicy = [pscustomobject]@{ SkipReason = 'PolicyUnavailable'; Resolvers = @() } }
                }
                $diagnostic.SkipReason = $resolverPolicy.SkipReason
                if (-not $diagnostic.SkipReason) {
                    $hostDeadline = [datetime]::UtcNow.AddSeconds(15)
                    if ($hostDeadline -gt $Deadline) { $hostDeadline = $Deadline }
                    $resolverResults = [System.Collections.ArrayList]::new()
                    foreach ($resolver in $resolverPolicy.Resolvers) {
                        $entry = [pscustomobject]@{
                            DnsServer = [string]$resolver.DnsServer; InterfaceAlias = [string]$resolver.InterfaceAlias
                            Status = 'Skipped'; Addresses = @(); DurationMilliseconds = $null
                            PrivateAddresses = @(); HasPrivateAddress = $null; PrivateAddressAssessment = $null
                            ErrorCode = $null; SkipReason = $resolver.SkipReason
                        }
                        if (-not $entry.SkipReason -and [datetime]::UtcNow -ge $hostDeadline) { $entry.SkipReason = 'BudgetExceeded' }
                        if (-not $entry.SkipReason) {
                            $watch = [System.Diagnostics.Stopwatch]::StartNew()
                            try {
                                $queryDeadline = [datetime]::UtcNow.AddSeconds(5)
                                if ($queryDeadline -gt $hostDeadline) { $queryDeadline = $hostDeadline }
                                $query = Invoke-JobWithAnimation -JobName ('DNS-query-' + [guid]::NewGuid().ToString('N')) -Activity 'DNS diagnostics' -Deadline $queryDeadline -ArgumentList @($hostname, $resolver.DnsServer) -JobScriptBlock (Get-Command Invoke-DnsDiagnosticQuery).ScriptBlock
                                if ($query.TimedOut) {
                                    $entry.Status = 'Timeout'; $entry.ErrorCode = 'QueryDeadlineExceeded'
                                } elseif ($query.State -eq 'Completed' -and @($query.Output).Count -eq 1) {
                                    $entry.Status = [string]$query.Output[0].Status
                                    $entry.Addresses = @($query.Output[0].Addresses)
                                    $entry.ErrorCode = $query.Output[0].ErrorCode
                                    if ($entry.Status -eq 'Success') {
                                        $entry.PrivateAddresses = @($entry.Addresses | Where-Object { Test-IPv4IsRfc1918 -IpAddress $_ -ErrorAction Stop })
                                        $entry.HasPrivateAddress = $entry.PrivateAddresses.Count -gt 0
                                        $entry.PrivateAddressAssessment = 'None'
                                        if ($entry.HasPrivateAddress) {
                                            $entry.PrivateAddressAssessment = 'PrivateAddress'
                                            if (@($script:PrivateLinkCriticalEndpoints | Where-Object { $hostname -like $_ }).Count) {
                                                $entry.PrivateAddressAssessment = 'UnsupportedArcPrivateLink'
                                            } elseif (@($script:PrivateLinkProxyBypassEndpoints | Where-Object { $hostname -like $_ }).Count) {
                                                $entry.PrivateAddressAssessment = 'PotentialPaaSPrivateLink'
                                            }
                                        }
                                    }
                                } else { $entry.Status = 'Error'; $entry.ErrorCode = 'QueryWorkerFailed' }
                            } catch {
                                $entry.Status = 'Error'; $entry.ErrorCode = 'DiagnosticCollectionError'
                                $entry.HasPrivateAddress = $null; $entry.PrivateAddressAssessment = $null
                            } finally {
                                $watch.Stop()
                                $entry.DurationMilliseconds = [math]::Round($watch.Elapsed.TotalMilliseconds, 1)
                            }
                        }
                        [void]$resolverResults.Add($entry)
                        $diagnostic.ResolverResults = @($resolverResults)
                    }
                    $diagnostic.ResolverResults = @($resolverResults)
                    $skipped = @($resolverResults | Where-Object { $_.Status -eq 'Skipped' }).Count
                    $incomplete = @($resolverResults | Where-Object { $_.ErrorCode -in @('QueryDeadlineExceeded', 'QueryWorkerFailed', 'DiagnosticCollectionError') }).Count
                    $diagnostic.CollectionStatus = if (-not $resolverResults.Count -or $skipped -eq $resolverResults.Count) { 'Skipped' } elseif ($skipped -or $incomplete) { 'Partial' } else { 'Complete' }
                    if (-not $resolverResults.Count) { $diagnostic.SkipReason = 'NoEligibleResolvers' }
                }
                $cache[$hostname] = $diagnostic
            }
        } catch {
            $diagnostic.CollectionStatus = 'Partial'
            $diagnostic.SkipReason = 'DiagnosticCollectionError'
        } finally {
            Add-Member -InputObject $row -NotePropertyName DNSDiagnostics -NotePropertyValue $diagnostic -Force
        }
    }
}

# Check DNS to for domain name, and return IP address if found
Function Get-DnsRecord {
    param (
        [Parameter(Mandatory=$true)]    
        [ValidateLength(1, 255)]
        [string]$url,

        [Parameter(Mandatory=$false)]
        [switch]$SkipRfc1918Check
    )

    begin {
        # Write-Debug "Get-DnsRecord: Beginning DNS lookup process"
        # Initialize variables
        [bool]$dnsExists = $False
        $dnsFailureCode = 'NoRecords'
    }

    process {
        Write-Debug "Checking to see if $($url) returns an IP address from DNS"
        # Remove variables
        $ipAddress = $null

        # Call Resolve-DnsName with exponential backoff: retry up to $script:DNS_MAX_RETRIES times
        # with increasing delays (1s, 2s, 4s + jitter) to avoid flooding DNS on flaky networks.
        For ($i=1; $i -le $script:DNS_MAX_RETRIES; $i++) {
        
            # Remove variables
            $DNSCheckError = $null
            # Initialize variables
            $DNSCheck = @()
            # Check if the domain name exists in DNS
            if(-not($dnsExists)){
                Write-Debug "DNS attempt $i of 3: Checking DNS server for endpoint '$url'"

                try {
            
                    # Check if the domain name exists in DNS using Resolve-DnsName.
                    # //// Use "5>$null" to suppress internal tracing messages such as "DEBUG: 72136".
                    $DNSCheck = Resolve-DnsName -Name $url -Type A -DnsOnly -ErrorAction Stop -ErrorVariable DNSCheckError 5>$null

                # /////////////////////
                # Error handling logic
                # /////////////////////
                } catch [System.Management.Automation.CommandNotFoundException] { # Catch if Resolve-DnsName is not found, not expected
                    throw "Resolve-DnsName cmdlet is not available. This module requires Windows 8/Server 2012 or later."

                } catch { 
                    $DNSCheckError = $_
                    $dnsFailureCode = if ($_.Exception.PSObject.Properties['NativeErrorCode']) { [string]$_.Exception.NativeErrorCode } else { 'ResolutionError' }
                    # Catch DNS Errors
                    # Check if the error message contains 'DNS name does not exist'
                    if($_.Exception.Message.ToString().Contains('DNS name does not exist')) {
                        Write-Debug "DNS Error for '$url' Exception: $($_.Exception.Message)"
                    } else {
                        # All other DNS errors
                        if($i -eq $script:DNS_MAX_RETRIES){
                            Write-HostAzS "Error: DNS lookup failed for '$url' - Exception Message: $($_.Exception.Message)" -ForegroundColor Red
                        }
                    }
                    # Exponential backoff before next retry: delay = base * 2^(attempt-1) + random jitter
                    if ($i -lt $script:DNS_MAX_RETRIES) {
                        $backoffDelay = $script:DNS_RETRY_BASE_DELAY_SEC * [math]::Pow(2, ($i - 1))
                        $jitter = Get-Random -Minimum 0.0 -Maximum 0.5
                        $totalDelay = [math]::Round($backoffDelay + $jitter, 1)
                        Write-HostAzS "DNS lookup failed for '$url' (attempt $i of $($script:DNS_MAX_RETRIES)), retrying in $($totalDelay)s..." -ForegroundColor Yellow
                        Start-Sleep -Milliseconds (($backoffDelay + $jitter) * 1000)
                    } else {
                        Write-HostAzS "DNS lookup failed for '$url' (attempt $i of $($script:DNS_MAX_RETRIES)), no more retries." -ForegroundColor Red
                    }

                } Finally {
                    # If no DNS errors, set the ipAddress variable to IP address returned from DNS
                    if(-not($DNSCheckError)) {
                        
                        $resolvedAddresses = @($DNSCheck | Where-Object { $_.IPAddress } | ForEach-Object { [string[]]$_.IPAddress })
                        if ($resolvedAddresses.Count) {
                            $ipAddress = $resolvedAddresses[0]
                            $dnsExists = $true
                        } else {
                            $ipAddress = "No Type A record found in DNS"
                            $dnsExists = $false
                            $dnsFailureCode = 'NoRecords'
                        }
                    
                    } else {
                        # DNS Error variable exists, set IP address to "DNS Lookup Failed"
                        $ipAddress = if ($dnsFailureCode -eq '9003') { 'DNS name does not exist' } else { "DNS lookup failed ($dnsFailureCode)" }
                        $dnsExists = $False
                    }

                } # End of Finally block

            } else {
                # DNS already exists, skip further checks, but will be on second loop
                Write-Debug "IP address found from DNS on attempt $($i -1), skipping further name resolution attempts"
                Break
            }

        } # End of For loop three attempts

        if($dnsExists){
            $dnsFailureCode = $null
            Write-Verbose "DNS lookup successful for $url, returned IP Address: $ipAddress"
        } else {
            Write-HostAzS "DNS lookup failed for $url" -ForegroundColor Red
            Write-Verbose  "DNS lookup failed three times for $url - $ipAddress"
        }

        # Test if the IP address is RFC1918 private address
        if(-not($SkipRfc1918Check.IsPresent)){
            # Only test if the SkipRfc1918Check switch is not present
            if($ipAddress -and (-not($ipAddress -in @("No Type A record found in DNS","DNS name does not exist","")))){
                # Check if the IP address is in valid IPv4 format
                if(($IpAddress -match '^(\d{1,3}\.){3}\d{1,3}$')) {
                    # Only test if the IP address is valid
                    Write-Verbose "Testing if returned IP Address '$ipAddress' is an RFC1918 private address"
                    # Check if the IP address is an RFC1918 private address
                    if(Test-IPv4IsRfc1918 -IpAddress $ipAddress){
                        # IP Address is an RFC1918 private address
                        Remove-Variable testUrl -ErrorAction SilentlyContinue
                        # Ensure URL is lowercase for comparison
                        $testUrl = $url.ToLower()

                        # Tier 1: Check if URL matches critical Arc service Private Link endpoints (NOT SUPPORTED)
                        Remove-Variable isUrlArcServicePrivateLink -ErrorAction SilentlyContinue
                        $isUrlArcServicePrivateLink = $script:PrivateLinkCriticalEndpoints | Where-Object { $testUrl -like $_ }

                        # Tier 2: Check if URL matches PaaS services that support Private Link (proxy bypass needed)
                        Remove-Variable isUrlPaaSPrivateLink -ErrorAction SilentlyContinue
                        $isUrlPaaSPrivateLink = $script:PrivateLinkProxyBypassEndpoints | Where-Object { $testUrl -like $_ }

                        # v0.6.8: when a proxy is enabled, VERIFY (not just advise) whether this
                        # RFC1918-resolving endpoint is actually excluded from the forward proxy via
                        # the WinHTTP bypass list or the NO_PROXY environment variable. Computed once
                        # here; Tier 2/3 branches below use it to emit a GREEN (correctly bypassed) or
                        # YELLOW (missing from bypass) result. Tier 1 (critical Arc) is always RED and
                        # ignores this — Arc endpoints must resolve to PUBLIC IPs regardless of bypass.
                        $bypassCheck = $null
                        if ($script:Proxy.Enabled) {
                            $bypassCheck = Test-EndpointBypassed -Fqdn $url -IpAddress $ipAddress `
                                -WinHttpBypass $script:Proxy.ProxyBypass -NoProxyEnv $script:Proxy.NoProxyEnv
                        }

                        if($isUrlArcServicePrivateLink){
                            # Tier 1 — RED: Arc Private Link Scopes NOT supported for Azure Local
                            Write-Debug "URL '$url' matches critical Arc service Private Link endpoint pattern for: '$isUrlArcServicePrivateLink'"
                            Write-HostAzS "CRITICAL: RFC1918 address detected for Arc endpoint '$url'!" -ForegroundColor Red
                            Write-HostAzS "`tArc Private Link Scopes are NOT supported for Azure Local." -ForegroundColor Red
                            Write-HostAzS "`tThis endpoint must resolve to a public IP address. IP returned from DNS: '$ipAddress'" -ForegroundColor Red
                            Write-HostAzS "`tCheck for CNAME Alias in your DNS zones configuration." -ForegroundColor Red
                            Write-HostAzS "`tReference: https://learn.microsoft.com/en-us/azure/azure-local/concepts/firewall-requirements" -ForegroundColor Red
                            Write-HostAzS "Sleeping for 10 seconds..." -ForegroundColor Red
                            Start-Sleep -Seconds 10
                            $script:PrivateLinkCriticalArray += $url

                        } elseif($isUrlPaaSPrivateLink){
                            # Tier 2 — PaaS Private Link supported. Verify it is excluded from the proxy.
                            Write-Debug "URL '$url' matches PaaS Private Link endpoint pattern for: '$isUrlPaaSPrivateLink'"
                            if($script:Proxy.Enabled){
                                if($bypassCheck -and $bypassCheck.Bypassed){
                                    # GREEN — RFC1918 Private Link endpoint correctly excluded from the proxy.
                                    Write-HostAzS "OK: RFC1918 (Private Link) detected for '$url' and correctly excluded from the proxy." -ForegroundColor Green
                                    Write-HostAzS "`tIP: '$ipAddress' | Matched $($bypassCheck.Source) bypass rule: '$($bypassCheck.MatchedRule)'" -ForegroundColor Green
                                    $script:PrivateLinkBypassConfirmedArray += $url
                                } else {
                                    # YELLOW — RFC1918 Private Link endpoint is NOT on the bypass list.
                                    Write-HostAzS "WARNING: RFC1918 (Private Link) detected for '$url' but it is NOT on the proxy bypass list." -ForegroundColor Yellow
                                    Write-HostAzS "`tIP Address returned from DNS: '$ipAddress'" -ForegroundColor Yellow
                                    Write-HostAzS "`tAdd this FQDN (or its subnet) to the WinHTTP bypass list / NO_PROXY so traffic routes via ExpressRoute or VPN, not through the proxy." -ForegroundColor Yellow
                                    $script:PrivateLinkBypassMissingArray += $url
                                }
                            } else {
                                # No proxy configured — routing must still reach the private endpoint via ExpressRoute/VPN.
                                Write-HostAzS "WARNING: RFC1918 address detected for '$url' - Private endpoint in use." -ForegroundColor Yellow
                                Write-HostAzS "`tIP Address returned from DNS: '$ipAddress'" -ForegroundColor Yellow
                                Write-HostAzS "`tEnsure routing is configured to send traffic via ExpressRoute or Site-to-Site VPN." -ForegroundColor Yellow
                            }
                            $script:PrivateLinkProxyBypassArray += $url

                        } else {
                            # Tier 3 — Other RFC1918. Still verify proxy bypass so the operator gets a definitive signal.
                            if($script:Proxy.Enabled){
                                if($bypassCheck -and $bypassCheck.Bypassed){
                                    Write-HostAzS "OK: RFC1918 private address detected for '$url' and correctly excluded from the proxy." -ForegroundColor Green
                                    Write-HostAzS "`tIP: '$ipAddress' | Matched $($bypassCheck.Source) bypass rule: '$($bypassCheck.MatchedRule)'" -ForegroundColor Green
                                    $script:PrivateLinkBypassConfirmedArray += $url
                                } else {
                                    Write-HostAzS "WARNING: RFC1918 private address detected for '$url' but it is NOT on the proxy bypass list." -ForegroundColor Yellow
                                    Write-HostAzS "`tIP returned from DNS: '$ipAddress'. Add this FQDN (or its subnet) to the WinHTTP bypass list / NO_PROXY." -ForegroundColor Yellow
                                    Write-HostAzS "`tAlso check for a CNAME alias of this endpoint in your DNS zones configuration." -ForegroundColor Yellow
                                    $script:PrivateLinkBypassMissingArray += $url
                                }
                            } else {
                                # Tier 3 — YELLOW: Other RFC1918 address, informational
                                Write-HostAzS "INFO: RFC1918 private address detected for '$url'. IP returned from DNS: '$ipAddress'" -ForegroundColor Yellow
                                Write-HostAzS "`tCheck for CNAME Alias of endpoint in your DNS zones configuration." -ForegroundColor Yellow
                            }
                        }

                        $script:PrivateLinkDetected = $true
                        $script:PrivateLinkDetectedArray += $url
                    } else {
                        # Do nothing
                        Write-Verbose "Returned IP Address is NOT an RFC1918 private address."
                    }
                } else {
                    Write-Verbose "Returned IP Address '$ipAddress' is not in valid IPv4 format, skipping RFC1918 private address test"
                }
            } else {
                Write-Debug "Not testing if returned IP Address '$ipAddress' is an RFC1918 private address, as it is not a valid IP address"
            }

        } else {
            Write-Debug "SkipRfc1918Check switch present, skipping RFC1918 private address test"
        }

    } # End of process block

    end {
        # Write-Debug "Get-DnsRecord: DNS lookup process completed"

        # Return True/False and IP Address output as a PSObject.
        $DNSReturnVariable = New-Object PsObject -Property @{
            # True/False
            DNSExists = $dnsExists
            DNSFailureCode = $dnsFailureCode
            # IP Address, or "DNS Lookup Failed"
            IPAddress = $ipAddress
        }
        return $DNSReturnVariable

    } # End of end block

} # End of Get-DnsRecord function


# ////////////////////////////////////////////////////////////////////////////
# Function to test if an IP address is in the RFC 1918 private IP range.
# Returns $true if the IP address is in the private range, otherwise returns $false.
Function Test-IPv4IsRfc1918 {
    param (
        [Parameter(Mandatory = $true)]
        [ValidateNotNull()]
        [ipaddress]$IpAddress
    )

    begin {
        # Write-Debug "Test-IPv4IsRfc1918: Beginning RFC1918 private IP address check for '$IpAddress'"
    }

    process {

        $IpAddressString = $IpAddress.ToString()
        # Validated IP is correct IPv4 format
        if (-not ($IpAddressString -match '^(\d{1,3}\.){3}\d{1,3}$')) {
            Write-Error "Invalid IPv4 address format."
            Return $false
        }

        $octets = $IpAddressString.Split('.')
        if ($octets.Count -ne 4) { Return $false }

        # Convert octets to integers
        $o1 = [int]$octets[0]
        $o2 = [int]$octets[1]

        # 10.0.0.0/8 (10.0.0.0 - 10.255.255.255)
        if ($o1 -eq 10) { Return $true }
        # 172.16.0.0/12 (172.16.0.0 - 172.31.255.255)
        if ($o1 -eq 172 -and $o2 -ge 16 -and $o2 -le 31) { Return $true }
        # 192.168.0.0/16 (192.168.0.0 - 192.168.255.255)
        if ($o1 -eq 192 -and $o2 -eq 168) { Return $true }

        # Not in RFC 1918 private IP range
        Return $false
    } # End of process block

    end {
        # Write-Debug "Test-IPv4IsRfc1918: RFC1918 private IP address check completed"
    }
} # End Function Test-IPv4IsRfc1918

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