Enable SNI hostname extension in SecureSocket.

runtime/bin/secure_socket.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/secure_socket.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <stdio.h>
@@ skipping 857 matching lines @@
   if (in_handshake_) {
     FATAL("Connect called twice on the same _SecureFilter.");
   }
 
   int status;
   int error;
   BIO* ssl_side;
   status = BIO_new_bio_pair(&ssl_side, 10000, &socket_side_, 10000);
   CheckStatus(status, "BIO_new_bio_pair", __LINE__);
 
-  if (context == NULL) {
-    DART_CHECK_VALID(Dart_ThrowException(DartUtils::NewDartArgumentError(
-        "Default SecurityContext not implemented, context cannot be null.")));
-  }
-
+  assert(context != NULL);
   ssl_ = SSL_new(context);
   SSL_set_bio(ssl_, ssl_side, ssl_side);
   SSL_set_mode(ssl_, SSL_MODE_AUTO_RETRY);  // TODO(whesse): Is this right?
   SSL_set_ex_data(ssl_, filter_ssl_index, this);
 
   if (is_server_) {
     // Do not request a client certificate.
     // TODO(24069): Allow server to request a client certificate, when desired.
     SSL_set_verify(ssl_, SSL_VERIFY_NONE, NULL);
   } else {
     SetAlpnProtocolList(protocols_handle, ssl_, NULL, false);
+    status = SSL_set_tlsext_host_name(ssl_, hostname);
+    CheckStatus(status, "Set SNI host name", __LINE__);
     // Sets the hostname in the certificate-checking object, so it is checked
     // against the certificate presented by the server.
     X509_VERIFY_PARAM* certificate_checking_parameters = SSL_get0_param(ssl_);
     hostname_ = strdup(hostname);
     X509_VERIFY_PARAM_set_flags(certificate_checking_parameters,
                                 X509_V_FLAG_PARTIAL_CHAIN |
                                 X509_V_FLAG_TRUSTED_FIRST);
     X509_VERIFY_PARAM_set_hostflags(certificate_checking_parameters, 0);
     X509_VERIFY_PARAM_set1_host(certificate_checking_parameters,
                                 hostname_, strlen(hostname_));
@@ skipping 222 matching lines @@
     } else {
       if (SSL_LOG_DATA) Log::Print(
           "WriteEncrypted  BIO_read wrote %d bytes\n", bytes_processed);
     }
   }
   return bytes_processed;
 }
 
 }  // namespace bin
 }  // namespace dart