From 32bd2a8953356d41a8a665896ccebf7f96c0d9a0 Mon Sep 17 00:00:00 2001
From: Alexandre Ratchov <alex@caoua.org>
Date: Mon, 19 Nov 2012 00:13:19 +0100
Subject: [PATCH] use IPV6_V6ONLY

---
 sndiod/listen.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/sndiod/listen.c b/sndiod/listen.c
index 11df33e..e80cd8c 100644
--- a/sndiod/listen.c
+++ b/sndiod/listen.c
@@ -166,6 +166,20 @@ listen_new_tcp(char *addr, unsigned int port)
 			perror("setsockopt");
 			goto bad_close;
 		}
+		if (ai->ai_family == AF_INET6) {
+			/*
+			 * make sure IPv6 sockets are restricted to IPv6
+			 * addresses because we already use a IP socket
+			 * for IP addresses
+			 */
+			opt = 1;
+			if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
+				&opt, sizeof(int)) < 0) {
+				perror("setsockopt");
+				goto bad_close;
+			}
+		}
+			
 		if (bind(s, ai->ai_addr, ai->ai_addrlen) < 0) {
 			perror("bind");
 			goto bad_close;