From e90afb8526d45d7ead8a662c5113e08370937f9d Mon Sep 17 00:00:00 2001
From: Viktor Gotwig <viktor.gotwig@q-loud.de>
Date: Tue, 21 Nov 2017 15:58:25 +0100
Subject: [PATCH] Adding tls host name extension (SNI)

Signed-off-by: Viktor Gotwig <viktor.gotwig@q-loud.de>
---
 lib/net_mosq.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/net_mosq.c b/lib/net_mosq.c
index 73c3207d..d331ef07 100644
--- a/lib/net_mosq.c
+++ b/lib/net_mosq.c
@@ -589,6 +589,14 @@ int net__socket_connect_step3(struct mosquitto *mosq, const char *host, uint16_t
 		}
 		SSL_set_bio(mosq->ssl, bio, bio);
 
+		/*
+		 * required for the SNI resolving
+		 */
+		if(SSL_set_tlsext_host_name(mosq->ssl, host) != 1) {
+			COMPAT_CLOSE(mosq->sock);
+			return MOSQ_ERR_TLS;
+		}
+
 		if(net__socket_connect_tls(mosq)){
 			return MOSQ_ERR_TLS;
 		}