Set SNI Hostname for WSS connection

Author: philippeVerney

src/etp/AbstractClientSessionCRTP.h

@@ -32,7 +32,7 @@ namespace ETP_NS
 
 		void on_connect(boost::system::error_code ec) {
 			if (ec) {
-				std::cerr << "on_connect : " << ec.message() << std::endl;
+				std::cerr << "Websocket on connect : " << ec.message() << std::endl;
 			}
 
 #if BOOST_VERSION < 107000

src/etp/ClientSession.h

@@ -75,7 +75,7 @@ namespace ETP_NS
 		void on_handshake(boost::system::error_code ec)
 		{
 			if (ec) {
-				std::cerr << "on_handshake : " << ec.message() << std::endl;
+				std::cerr << "on WS handshake : " << ec.message() << std::endl;
 				std::cerr << "Sometimes some ETP server require a trailing slash at the end of their URL. Did you also check your optional \"data-partition-id\" additional Header Field?" << std::endl;
 				return;
 			}

src/etp/ssl/HttpsClientSession.h

@@ -74,7 +74,7 @@ namespace ETP_NS
 			if (!SSL_set_tlsext_host_name(stream_.native_handle(), etpServerHost.data()))
 			{
 				boost::system::error_code ec{ static_cast<int>(::ERR_get_error()), boost::asio::error::get_ssl_category() };
-				std::cerr << ec.message() << "\n";
+				std::cerr << "HTTPS on connect (SNI): " << ec.message() << "\n";
 				return;
 			}
 

src/etp/ssl/SslClientSession.h

@@ -66,6 +66,13 @@ namespace ETP_NS
 				std::cerr << "on_resolve : " << ec.message() << std::endl;
 			}
 
+			// Set SNI Hostname (many hosts need this to handshake successfully)
+			if (!SSL_set_tlsext_host_name(ws_.next_layer().native_handle(), etpServerHost.c_str()))
+			{
+				boost::system::error_code ecSNI{ static_cast<int>(::ERR_get_error()), boost::asio::error::get_ssl_category() };
+				std::cerr << "Websocket on connect (SNI): " << ecSNI.message() << std::endl;
+			}
+
 			// Reality check: IPv6 is unlikely to be available yet
 			std::vector<tcp::endpoint> endpoints(results.begin(), results.end());
 			std::stable_partition(endpoints.begin(), endpoints.end(), [](auto entry) {return entry.protocol() == tcp::v4(); });