From ea23ddd69e5451abd9f7976018adc8842d0587a7 Mon Sep 17 00:00:00 2001
From: ed <eddavies95@gmail.com>
Date: Thu, 14 Dec 2017 15:15:03 +0000
Subject: [PATCH] Added a method to DatagramSocket to set whether multicast
 loopback should be enabled

---
 modules/juce_core/network/juce_Socket.cpp |  8 ++++++++
 modules/juce_core/network/juce_Socket.h   | 10 ++++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/modules/juce_core/network/juce_Socket.cpp b/modules/juce_core/network/juce_Socket.cpp
index 1fb520b938..4ffcf49f90 100644
--- a/modules/juce_core/network/juce_Socket.cpp
+++ b/modules/juce_core/network/juce_Socket.cpp
@@ -741,6 +741,14 @@ bool DatagramSocket::leaveMulticast (const String& multicastIPAddress)
     return SocketHelpers::multicast (handle, multicastIPAddress, lastBindAddress, false);
 }
 
+bool DatagramSocket::setMulticastLoopbackEnabled (bool enable)
+{
+    if (! isBound || handle < 0)
+        return false;
+
+    return SocketHelpers::setOption<bool> (handle, IPPROTO_IP, IP_MULTICAST_LOOP, enable);
+}
+
 bool DatagramSocket::setEnablePortReuse (bool enabled)
 {
    #if JUCE_ANDROID
diff --git a/modules/juce_core/network/juce_Socket.h b/modules/juce_core/network/juce_Socket.h
index 1b97325adb..fe689b4fe8 100644
--- a/modules/juce_core/network/juce_Socket.h
+++ b/modules/juce_core/network/juce_Socket.h
@@ -315,18 +315,24 @@ public:
     void shutdown();
 
     //==============================================================================
-    /** Join a multicast group
+    /** Join a multicast group.
 
         @returns true if it succeeds.
     */
     bool joinMulticast (const String& multicastIPAddress);
 
-    /** Leave a multicast group
+    /** Leave a multicast group.
 
         @returns true if it succeeds.
     */
     bool leaveMulticast (const String& multicastIPAddress);
 
+    /** Enables or disables multicast loopback.
+
+        @returns true if it succeeds.
+    */
+    bool setMulticastLoopbackEnabled (bool enableLoopback);
+
     //==============================================================================
     /** Allow other applications to re-use the port.