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A repository of PowerShell Scripts to automate a variety of IT related maintenance tasks.

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Resolve-DomainDNS.ps1

Description

@GitHub Copilot - Welcome @BanterBoy, I’m your Copilot and I’m here to help you get things done faster. I can identify issues, explain and even improve code.

You can ask generic questions, but what I’m really good at is helping you with your code. For example:

Generate unit tests for my code Explain the selected code Propose a fix for the bugs in my code If you want to learn more about my capabilities and limitations, check out the Copilot documentation.

I’m powered by AI, so surprises and mistakes are possible. Make sure to verify any generated code or suggestions, and share feedback so that we can learn and improve.

@BanterBoy: - Explain what the script does and why it is useful.

@GitHub Copilot -

Script

function Get-DMARCRecord {
    <#
    .SYNOPSIS
        Get DMARC Record for a domain.
    .DESCRIPTION
        This function uses Resolve-DNSName to get the DMARC Record for a given domain. Objects with a DomainName property,
        such as returned by Get-AcceptedDomain, can be piped to this function.
    .EXAMPLE
        Get-AcceptedDomain | Get-DMARCRecord

        This example gets DMARC records for all domains returned by Get-AcceptedDomain.
    #>
    [CmdletBinding(HelpUri = 'https://ntsystems.it/PowerShell/TAK/Get-DMACRecord/')]
    param (
        # Specify the Domain name to use for the query.
        [Parameter(Mandatory = $true,
            ValueFromPipelineByPropertyName = $true,
            ValueFromPipeline = $true)]
        [string]
        $DomainName,

        # Specify a DNS server to query.
        [string]
        $Server
    )
    process {
        $params = @{
            Name        = "_dmarc.$DomainName"
            ErrorAction = "SilentlyContinue"
        }
        if ($Server) { $params.Add("Server", $Server) }
        $dnsTxt = Resolve-DnsName @params -Type  TXT | Where-Object Type -eq TXT
        $dnsTxt | Select-Object @{Name = "DMARC"; Expression = { "$DomainName`:$s" } }, @{Name = "Record"; Expression = { $_.Strings } }
    }
}

function Get-DKIMRecord {
    <#
    .SYNOPSIS
        Get DKIM Record for a domain.
    .DESCRIPTION
        This function uses Resolve-DNSName to get the DKIM Record for a given domain. Objects with a DomainName property,
        such as returned by Get-AcceptedDomain, can be piped to this function. The function defaults to "selector1" as this
        is typically used with Exchange Online.
    .EXAMPLE
        Get-AcceptedDomain | Get-DKIMRecord

        This example gets DKIM records for all domains returned by Get-AcceptedDomain.
    #>
    [CmdletBinding(HelpUri = 'https://ntsystems.it/PowerShell/TAK/Get-DKIMRecord/')]
    param (
        # Specify the Domain name to use in the query.
        [Parameter(Mandatory = $true,
            ValueFromPipelineByPropertyName = $true,
            ValueFromPipeline = $true)]
        [string]
        $DomainName,

        # Specify a selector name to use in the query.
        [Parameter()]
        [string[]]
        $Selector,

        # Specify a DNS server to query.
        [Parameter()]
        [string]
        $Server
    )
    process {
        foreach ($name in $Selector) {
            $params = @{
                Name        = "$name._domainkey.$DomainName"
                ErrorAction = "SilentlyContinue"
            }
            if ($Server) { $params.Add("Server", $Server) }
            $dnsTxt = Resolve-DnsName @params -Type TXT | Where-Object Type -eq TXT
            $dnsTxt | Select-Object @{Name = "DKIM"; Expression = { "$DomainName`:$s" } }, @{Name = "Record"; Expression = { $_.Strings } }
        }
    }
}

function Get-SPFRecord {
    <#
    .Synopsis
    Get SPF Record for a domain.
    .DESCRIPTION
    This function uses Resolve-DNSName to get the SPF Record for a given domain. Objects with a DomainName property,
    such as returned by Get-AcceptedDomain, can be piped to this function.
    .EXAMPLE
    Get-AcceptedDomain | Get-SPFRecord

    This example gets SPF records for all domains returned by Get-AcceptedDomain.
    #>
    [CmdletBinding(HelpUri = 'https://ntsystems.it/PowerShell/TAK/Get-SPFRecord/')]
    param (
        # Specify the Domain name for the query.
        [Parameter(Mandatory = $true,
            ValueFromPipelineByPropertyName = $true,
            ValueFromPipeline = $true)]
        [string]
        $DomainName,

        # Specify the Domain name for the query.
        [string]
        $Server
    )
    process {
        $params = @{
            Type        = "txt"
            Name        = $DomainName
            ErrorAction = "Stop"
        }
        if ($Server) { $params.Add("Server", $Server) }
        try {
            $dns = Resolve-DnsName @params | Where-Object Strings -Match "spf1"
            $dns | Select-Object @{Name = "DomainName"; Expression = { $_.Name } }, @{Name = "Record"; Expression = { $_.Strings } }
        }
        catch {
            Write-Warning $_
        }
    }
}

Resolve-DnsName -Name $env:USERDOMAIN -Type A -Server 8.8.8.8 -ErrorAction Stop
Get-SPFRecord -DomainName example.co.uk -Server 8.8.4.4 -ErrorAction Stop
Get-DMARCRecord -DomainName example.co.uk -Server 8.8.8.8 -ErrorAction Stop
Get-DKIMRecord -DomainName example.co.uk -Server 8.8.8.8 -ErrorAction Stop

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