VaultServer

1.0.0

Private/GetDomainName.ps1

                                function GetDomainName {

    [CmdletBinding()]

    Param()

    if (!$PSVersionTable.Platform -or $PSVersionTable.Platform -eq "Win32NT") {

        $Domain = $(Get-CimInstance Win32_ComputerSystem).Domain

    }

    if ($PSVersionTable.Platform -eq "Unix") {

        $Domain = domainname

        if (!$Domain -or $Domain -eq "(none)") {

            $ThisHostNamePrep = hostname

            if ($ThisHostNamePrep -match "\.") {

                $HostNameArray = $ThisHostNamePrep -split "\."

                $ThisHostName = $HostNameArray[0]

                $Domain = $HostNameArray[1..$HostNameArray.Count] -join '.'

            }

        }

        if (!$Domain) {

            $EtcHostsContent = Get-Content "/etc/hosts"

            $EtcHostsContentsArray = $(foreach ($HostLine in $EtcHostsContent) {

                $HostLine -split "[\s]" | foreach {$_.Trim()}

            }) | Where-Object {![System.String]::IsNullOrWhiteSpace($_)}

            $PotentialStringsWithDomainName = $EtcHostsContentsArray | Where-Object {

                $_ -notmatch "localhost" -and

                $_ -notmatch "localdomain" -and

                $_ -match "\." -and

                $_ -match "[a-zA-Z]"

            } | Sort-Object | Get-Unique

            if ($PotentialStringsWithDomainName.Count -eq 0) {

                Write-Error "Unable to determine domain for $(hostname)! Please use the -DomainName parameter and try again. Halting!"

                $global:FunctionResult = "1"

                return

            }

            [System.Collections.ArrayList]$PotentialDomainsPrep = @()

            foreach ($Line in $PotentialStringsWithDomainName) {

                if ($Line -match "^\.") {

                    $null = $PotentialDomainsPrep.Add($Line.Substring(1,$($Line.Length-1)))

                }

                else {

                    $null = $PotentialDomainsPrep.Add($Line)

                }

            }

            [System.Collections.ArrayList]$PotentialDomains = @()

            foreach ($PotentialDomain in $PotentialDomainsPrep) {

                $RegexDomainPattern = "^([a-zA-Z0-9][a-zA-Z0-9-_]*\.)*[a-zA-Z0-9]*[a-zA-Z0-9-_]*[[a-zA-Z0-9]+$"

                if ($PotentialDomain -match $RegexDomainPattern) {

                    $FinalPotentialDomain = $PotentialDomain -replace $ThisHostName,""

                    if ($FinalPotentialDomain -match "^\.") {

                        $null = $PotentialDomains.Add($FinalPotentialDomain.Substring(1,$($FinalPotentialDomain.Length-1)))

                    }

                    else {

                        $null = $PotentialDomains.Add($FinalPotentialDomain)

                    }

                }

            }

            if ($PotentialDomains.Count -eq 1) {

                $Domain = $PotentialDomains

            }

            else {

                $Domain = $PotentialDomains[0]

            }

        }

    }

    if ($Domain) {

        $Domain

    }

    else {

        Write-Error "Unable to determine Domain Name! Halting!"

        $global:FunctionResult = "1"

        return

    }

}

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