functions/Resolve-DbaNetworkName.ps1

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Function Resolve-DbaNetworkName
{
<#
.SYNOPSIS
Returns information about the network connection of the target computer including NetBIOS name, IP Address, domain name and fully qualified domain name (FQDN).
 
.DESCRIPTION
Retrieves the IPAddress, ComputerName from one computer.
The object can be used to take action against its name or IPAddress.
 
First ICMP is used to test the connection, and get the connected IPAddress.
 
If your local Powershell version is not higher than 2, WMI is tried to get the computername.
If not, CIM is used, first via WinRM, and if not successful, via DCOM.
 
.PARAMETER ComputerName
The Server that you're connecting to.
This can be the name of a computer, a SMO object, an IP address or a SQL Instance.
 
.PARAMETER Credential
Credential object used to connect to the SQL Server as a different user
 
.PARAMETER Turbo
Resolves without accessing the serer itself. Faster but may be less accurate.
 
.NOTES
Author: Klaas Vandenberghe ( @PowerDBAKlaas )
 
dbatools PowerShell module (https://dbatools.io)
Copyright (C) 2016 Chrissy LeMaire
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.
 
.LINK
 https://dbatools.io/Resolve-DbaNetworkName
 
.EXAMPLE
Resolve-DbaNetworkName -ComputerName ServerA
 
Returns a custom object displaying InputName, ComputerName, IPAddress, DNSHostName, Domain, FQDN for ServerA
  
.EXAMPLE
Resolve-DbaNetworkName -SqlServer sql2016\sqlexpress
 
Returns a custom object displaying InputName, ComputerName, IPAddress, DNSHostName, Domain, FQDN for the SQL instance sql2016\sqlexpress
  
.EXAMPLE
Resolve-DbaNetworkName -SqlServer sql2016\sqlexpress, sql2014
 
Returns a custom object displaying InputName, ComputerName, IPAddress, DNSHostName, Domain, FQDN for the SQL instance sql2016\sqlexpress and sql2014
 
Get-SqlRegisteredServerName -SqlServer sql2014 | Resolve-DbaNetworkName
  
Returns a custom object displaying InputName, ComputerName, IPAddress, DNSHostName, Domain, FQDN for all SQL Servers returned by Get-SqlRegisteredServerName
#>

    [CmdletBinding()]
    param (
        [parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [Alias("cn", "host", "ServerInstance", "Server", "SqlServer")]
        [object]$ComputerName,
        [PsCredential]$Credential,
        [Alias("FastParrot")]
        [switch]$Turbo
    )
    
    PROCESS
    {
        foreach ( $Computer in $ComputerName )
        {
            $conn = $ipaddress = $CIMsession = $null
            
            if ( $Computer.GetType() -eq [Microsoft.SqlServer.Management.Smo.Server] )
            {
                $Computer = $Computer.NetName
            }
            
            $OGComputer = $Computer
            
            if ($Computer -eq "localhost" -or $Computer -eq ".")
            {
                $Computer = $env:COMPUTERNAME
            }
            
            $Computer = $Computer.Split('\')[0]
            Write-Verbose "Connecting to server $Computer"
            
            try
            {
                $ipaddress = ((Test-Connection -ComputerName $Computer -Count 1 -ErrorAction Stop).Ipv4Address).IPAddressToString
            }
            catch
            {
                try
                {
                    $ipaddress = ((Test-Connection -ComputerName "$Computer.$env:USERDNSDOMAIN" -Count 1 -ErrorAction SilentlyContinue).Ipv4Address).IPAddressToString
                    $Computer = "$Computer.$env:USERDNSDOMAIN"
                }
                catch
                {
                    $Computer = $OGComputer
                }
            }
            
            if ($Turbo)
            {
                try
                {
                    $fqdn = [System.Net.Dns]::GetHostByAddress($ipaddress).HostName
                }
                catch
                {
                    try
                    {
                        $fqdn = ([System.Net.Dns]::GetHostEntry($Computer)).HostName
                    }
                    catch
                    {
                        throw "DNS name does not exist"
                    }
                }
                
                if ($fqdn -notmatch "\.")
                {
                    $dnsdomain = $env:USERDNSDOMAIN.ToLower()
                    $fqdn = "$fqdn.$dnsdomain"
                }
                
                $hostname = $fqdn.Split(".")[0]
                
                [PSCustomObject]@{
                    InputName = $OGComputer
                    ComputerName = $hostname.ToUpper()
                    DNSHostname = $hostname
                    IPAddress = $ipaddress
                    Domain = $fqdn.Replace("$hostname.", "")
                    FQDN = $fqdn
                }
                return
            }
            
            if ( $ipaddress )
            {
                Write-Verbose "IP Address from $Computer is $ipaddress"
            }
            else
            {
                Write-Warning "No IP Address returned from Computer $Computer"
            }
            if ( $host.Version.Major -gt 2 )
            {
                Write-Verbose "Your PowerShell Version is $($host.Version.Major)"
                try
                {
                    Write-Verbose "Getting computer information from server $Computer via CIM (WSMan)"
                    if ($Credential)
                    {
                        $CIMsession = New-CimSession -ComputerName $Computer -ErrorAction SilentlyContinue -Credential $Credential
                    }
                    else
                    {
                        $CIMsession = New-CimSession -ComputerName $Computer -ErrorAction SilentlyContinue
                    }
                    
                    $conn = Get-CimInstance -Query "Select Name, Caption, DNSHostName, Domain FROM Win32_computersystem" -CimSession $CIMsession
                }
                catch
                {
                    Write-Verbose "No WSMan connection to $Computer"
                }
                if ( !$conn )
                {
                    try
                    {
                        Write-Verbose "Getting computer information from server $Computer via CIM (DCOM)"
                        $sessionoption = New-CimSessionOption -Protocol DCOM
                        if ($Credential)
                        {
                            $CIMsession = New-CimSession -ComputerName $Computer -SessionOption $sessionoption -ErrorAction SilentlyContinue -Credential $Credential
                            
                        }
                        else
                        {
                            $CIMsession = New-CimSession -ComputerName $Computer -SessionOption $sessionoption -ErrorAction SilentlyContinue
                        }
                        
                        $conn = Get-CimInstance -Query "Select Name, Caption, DNSHostName, Domain FROM Win32_computersystem" -CimSession $CIMsession
                    }
                    catch
                    {
                        Write-Warning "No DCOM connection for CIM to $Computer"
                    }
                }
                if ( !$conn )
                {
                    Write-Verbose "Getting computer information from server $Computer via WMI (DCOM)"
                    
                    if ($Credential)
                    {
                        $conn = Get-WmiObject -ComputerName $Computer -Query "Select Name, Caption, DNSHostName, Domain FROM Win32_computersystem" -ErrorAction SilentlyContinue -Credential $Credential
                    }
                    else
                    {
                        $conn = Get-WmiObject -ComputerName $Computer -Query "Select Name, Caption, DNSHostName, Domain FROM Win32_computersystem" -ErrorAction SilentlyContinue
                    }
                }
                
                if (!$conn)
                {
                    Write-Verbose "Cim and Wmi both failed. Defaulting to .NET"
                    try
                    {
                        $fqdn = ([System.Net.Dns]::GetHostEntry($Computer)).HostName
                        $hostname = $fqdn.Split(".")[0]
                        
                        $conn = [PSCustomObject]@{
                            Name = $Computer
                            DNSHostname = $hostname
                            Domain = $fqdn.Replace("$hostname.", "")
                        }
                    }
                    catch
                    {
                        # ouch, no dice
                    }
                }
            }
            
            
            try
            {
                Write-Verbose "Resolving $($conn.DNSHostname) using GetHostEntry"
                $hostentry = ([System.Net.Dns]::GetHostEntry($conn.DNSHostname)).HostName
            }
            catch
            {
                Write-Verbose "GetHostEntry failed"
            }
            
            $fqdn = "$($conn.DNSHostname).$($conn.Domain)"
            if ($fqdn -eq ".")
            {
                Write-Verbose "No full FQDN found. Setting to null"
                $fqdn = $null
            }
            
            [PSCustomObject]@{
                InputName = $OGComputer
                ComputerName = $conn.Name
                IPAddress = $ipaddress
                DNSHostName = $conn.DNSHostname
                Domain = $conn.Domain
                DNSHostEntry = $hostentry
                FQDN = $fqdn
            }
        }
    }
}