Private/utils/Test-ComputerNameIsLocalhost.ps1
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<#
The MIT License (MIT) Copyright (c) 2015 Objectivity Bespoke Software Specialists Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. #> function Test-ComputerNameIsLocalhost { <# .SYNOPSIS Checks whether supplied computer name is localhost. .DESCRIPTION It returns true if one of the following is true: - ComputerName = 'localhost' or '127.0.0.1' - ComputerName is equal to (hostname) - ComputerName is equal to one of local IPs - ComputerName is equal to local FQDN Note it does not guarantee to always return $true if ComputerName can be resolved to localhost. .PARAMETER ComputerName Computer name to test. .EXAMPLE Test-ComputerNameIsLocalhost -ComputerName '127.0.0.1' #> [CmdletBinding()] [OutputType([bool])] param( [Parameter(Mandatory=$true)] [string] $ComputerName ) $localhostNames = @('localhost', ([system.environment]::MachineName), '127.0.0.1', '.') try { if (Get-Command -Name Get-NetIPAddress -ErrorAction SilentlyContinue) { $localhostNames += (Get-NetIPAddress -AddressFamily IPv4).IPAddress } } catch { Write-Log -Warn 'Failed to get IP address for localhost' } try { $localhostNames += ([System.Net.Dns]::GetHostEntry([string]$env:computername).HostName) } catch { Write-Log -Warn 'Failed to get FQDN for localhost' } return ($localhostNames -icontains $ComputerName) } |