From c610c53a9e13dcfab373b223461fed3b65d7dde5 Mon Sep 17 00:00:00 2001
From: zelig <viktor.tron@gmail.com>
Date: Fri, 2 Jan 2015 18:54:59 +0000
Subject: [PATCH] if port is empty string, no listening

---
 eth/backend.go | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/eth/backend.go b/eth/backend.go
index 2ca1430d8c..ac696eca7f 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -86,12 +86,15 @@ func New(db ethutil.Database, identity p2p.ClientIdentity, keyManager *crypto.Ke
 	protocols := []p2p.Protocol{ethProto, eth.whisper.Protocol()}
 
 	server := &p2p.Server{
-		Identity:   identity,
-		MaxPeers:   maxPeers,
-		Protocols:  protocols,
-		ListenAddr: ":" + port,
-		Blacklist:  eth.blacklist,
-		NAT:        nat,
+		Identity:  identity,
+		MaxPeers:  maxPeers,
+		Protocols: protocols,
+		Blacklist: eth.blacklist,
+		NAT:       nat,
+	}
+
+	if len(port) > 0 {
+		server.ListenAddr = ":" + port
 	}
 
 	eth.server = server