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September 6, 2024 17:19
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Powershell Script to extract dhcp config from windows server
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| # Define the DHCP Server | |
| $dhcpServer = "MYSERVER" # Replace with the name or IP address of your DHCP server | |
| # Import the DHCP Server Module (in case it's not loaded) | |
| Import-Module DhcpServer | |
| # Output file for the Linux-compatible dhcpd.conf | |
| $outputFile = "C:\dhcpd.conf" | |
| # Clear the file if it exists, to avoid appending to old data | |
| if (Test-Path $outputFile) { | |
| Remove-Item $outputFile | |
| } | |
| # Retrieve all DHCP scopes (IPv4) | |
| $scopes = Get-DhcpServerv4Scope -ComputerName $dhcpServer | |
| # Retrieve DHCP global options (like DNS, Gateway, etc.) | |
| $globalOptions = Get-DhcpServerv4OptionValue -ComputerName $dhcpServer -ScopeId 0 | |
| # Process each scope to create Linux-compatible config | |
| foreach ($scope in $scopes) { | |
| $scopeID = $scope.ScopeId | |
| $subnetMask = $scope.SubnetMask | |
| $leaseRangeStart = $scope.StartRange | |
| $leaseRangeEnd = $scope.EndRange | |
| $leaseTime = $scope.LeaseDuration.TotalSeconds | |
| # Write the scope block for each scope | |
| Add-Content -Path $outputFile -Value @" | |
| subnet $scopeID netmask $subnetMask { | |
| range $leaseRangeStart $leaseRangeEnd; | |
| default-lease-time $leaseTime; | |
| max-lease-time $leaseTime; | |
| "@ | |
| # Get scope-specific options | |
| $scopeOptions = Get-DhcpServerv4OptionValue -ComputerName $dhcpServer -ScopeId $scopeID | |
| # Write DHCP options for the scope | |
| foreach ($option in $scopeOptions) { | |
| switch ($option.OptionId) { | |
| 3 { # Router/Gateway | |
| $gateway = ($option.Value) | |
| Write-Host "Data $gateway" | |
| Add-Content -Path $outputFile -Value " option routers $gateway;" | |
| } | |
| 6 { # DNS Servers | |
| $dnsServers = ($option.Value) -join ", " | |
| Add-Content -Path $outputFile -Value " option domain-name-servers $dnsServers;" | |
| } | |
| 15 { # Domain Name | |
| $domainName = ($option.Value) | |
| Add-Content -Path $outputFile -Value " option domain-name $domainName;" | |
| } | |
| # Add more options as needed | |
| } | |
| } | |
| # Get DHCP reservations (static leases) for the scope | |
| $reservations = Get-DhcpServerv4Reservation -ComputerName $dhcpServer -ScopeId $scopeID | |
| # Write reservation hosts into the scope block | |
| foreach ($reservation in $reservations) { | |
| $reservationIP = $reservation.IPAddress | |
| $reservationMAC = $reservation.ClientId | |
| $reservationHostname = $reservation.Name | |
| Add-Content -Path $outputFile -Value @" | |
| host $reservationHostname { | |
| hardware ethernet $reservationMAC; | |
| fixed-address $reservationIP; | |
| } | |
| "@ | |
| } | |
| # End of the scope block | |
| Add-Content -Path $outputFile -Value "}\n" | |
| } | |
| # Add global options to the configuration file (if needed) | |
| foreach ($option in $globalOptions) { | |
| switch ($option.OptionId) { | |
| 3 { # Router/Gateway | |
| $gateway = ($option.Value).Data | |
| Add-Content -Path $outputFile -Value "option routers $gateway;" | |
| } | |
| 6 { # DNS Servers | |
| $dnsServers = ($option.Value).Data -join ", " | |
| Add-Content -Path $outputFile -Value "option domain-name-servers $dnsServers;" | |
| } | |
| 15 { # Domain Name | |
| $domainName = ($option.Value).Data | |
| Add-Content -Path $outputFile -Value "option domain-name \"$domainName\";" | |
| } | |
| # Add more global options as needed | |
| } | |
| } | |
| Write-Host "DHCP configuration, including reservations, has been exported to $outputFile in Linux-compatible format." |
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