From bcac8c41667f450be0f64d35af6b84bcbeb1fa1a Mon Sep 17 00:00:00 2001
From: Leon Jacobs <leonja511@gmail.com>
Date: Wed, 2 Nov 2016 08:34:53 +0200
Subject: [PATCH] Check if the platform is macOS before trying to set a
 non-exported TCP_KEEPIDLE option

---
 tools/MultiRelay.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/MultiRelay.py b/tools/MultiRelay.py
index 7d8bd6a..3976801 100755
--- a/tools/MultiRelay.py
+++ b/tools/MultiRelay.py
@@ -140,7 +140,9 @@ def ConnectToTarget():
             s.setsockopt(SOL_SOCKET, SO_KEEPALIVE, 1)
             s.setsockopt(IPPROTO_TCP, TCP_KEEPCNT, 15)
             s.setsockopt(IPPROTO_TCP, TCP_KEEPINTVL, 5)
-            s.setsockopt(IPPROTO_TCP, TCP_KEEPIDLE, 5)
+            # macOS does not have TCP_KEEPIDLE
+            if sys.platform != 'darwin':
+                s.setsockopt(IPPROTO_TCP, TCP_KEEPIDLE, 5)
             s.connect(Host)  
             return s
         except: