Created
September 6, 2024 17:23
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Powershell Script, Generate Active DHCP Leases
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| # Define the DHCP Server and the list of Scope IDs (Zones) | |
| $dhcpServer = "MYSERVER" # Replace with the name or IP address of your DHCP server | |
| $scopeIDs = @("10.2.0.0","10.3.0.0","192.168.0.0") # Add all subnets here | |
| # Import the DHCP Server Module (in case it's not loaded) | |
| Import-Module DhcpServer | |
| # Function to convert lease time to Linux format, handling null values | |
| function Convert-LeaseTime($leaseTime) { | |
| if ($leaseTime -ne $null) { | |
| return $leaseTime.ToString("yyyy/MM/dd HH:mm:ss") | |
| } else { | |
| # Handle null by setting a default time or skipping | |
| return "2024/01/01 00:00:00" # Default to Unix epoch time for null values | |
| } | |
| } | |
| # Output file for Linux DHCP leases | |
| $outputFile = "C:\linux-dhcp-leases.txt" | |
| # Clear the file if it exists, to avoid appending to old data | |
| if (Test-Path $outputFile) { | |
| Remove-Item $outputFile | |
| } | |
| # Process each scope and fetch leases | |
| foreach ($scopeID in $scopeIDs) { | |
| Write-Host "Processing leases for scope: $scopeID" | |
| # Get the list of active leases for the specified scope | |
| $leases = Get-DhcpServerv4Lease -ComputerName $dhcpServer -ScopeId $scopeID | |
| # Process each lease and convert it into the Linux DHCP lease format | |
| $leaseData = foreach ($lease in $leases) { | |
| $leaseStartTime = Convert-LeaseTime($lease.AddressStateTime) | |
| $leaseEndTime = Convert-LeaseTime($lease.LeaseExpiryTime) | |
| @" | |
| lease $($lease.IPAddress) { | |
| starts $(($lease.AddressStateTime).DayOfWeek) $leaseStartTime; | |
| ends $(($lease.LeaseExpiryTime).DayOfWeek) $leaseEndTime; | |
| cltt $(($lease.AddressStateTime).DayOfWeek) $leaseStartTime; | |
| binding state active; | |
| next binding state free; | |
| hardware ethernet $($lease.ClientId); | |
| uid "$($lease.ClientId)"; | |
| client-hostname "$($lease.HostName)"; | |
| } | |
| "@ | |
| } | |
| # Append the formatted data to the output file | |
| $leaseData | Out-File -FilePath $outputFile -Append | |
| } | |
| Write-Host "Leases have been exported to $outputFile in Linux-compatible format, including hostnames." |
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