From 095233e3dc22d0adb5bb80801775ea64c3879f5c Mon Sep 17 00:00:00 2001
From: richtr <rich.tibbett@gmail.com>
Date: Mon, 8 Sep 2014 15:11:55 +0200
Subject: [PATCH] Add IP binding suppression if at least one listener is
 registered

---
 server.go | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/server.go b/server.go
index d426659..6f439b9 100644
--- a/server.go
+++ b/server.go
@@ -52,14 +52,8 @@ type Server struct {
 // NewServer is used to create a new mDNS server from a config
 func NewServer(config *Config) (*Server, error) {
 	// Create the listeners
-	ipv4List, err := net.ListenMulticastUDP("udp4", config.Iface, ipv4Addr)
-	if err != nil {
-		log.Printf("[ERR] mdns: Failed to start IPv4 listener: %v", err)
-	}
-	ipv6List, err := net.ListenMulticastUDP("udp6", config.Iface, ipv6Addr)
-	if err != nil {
-		log.Printf("[ERR] mdns: Failed to start IPv6 listener: %v", err)
-	}
+	ipv4List, _ := net.ListenMulticastUDP("udp4", config.Iface, ipv4Addr)
+	ipv6List, _ := net.ListenMulticastUDP("udp6", config.Iface, ipv6Addr)
 
 	// Check if we have any listener
 	if ipv4List == nil && ipv6List == nil {
@@ -72,8 +66,15 @@ func NewServer(config *Config) (*Server, error) {
 		ipv6List:   ipv6List,
 		shutdownCh: make(chan struct{}),
 	}
-	go s.recv(s.ipv4List)
-	go s.recv(s.ipv6List)
+
+	if ipv4List != nil {
+		go s.recv(s.ipv4List)
+	}
+
+	if ipv6List != nil {
+		go s.recv(s.ipv6List)
+	}
+
 	return s, nil
 }