net: support ALPN.

net/third_party/nss/ssl/ssl3con.c

 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /*
  * SSL3 Protocol
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /* $Id$ */
 
 /* TODO(ekr): Implement HelloVerifyRequest on server side. OK for now. */
@@ skipping 9891 matching lines @@
 
 /* called from ssl3_HandleServerHelloDone
  */
 static SECStatus
 ssl3_SendNextProto(sslSocket *ss)
 {
     SECStatus rv;
     int padding_len;
     static const unsigned char padding[32] = {0};
 
-    if (ss->ssl3.nextProto.len == 0)
+    if (ss->ssl3.nextProto.len == 0 ||
+        ss->ssl3.nextProtoState == SSL_NEXT_PROTO_SELECTED) {
         return SECSuccess;
+    }
 
     PORT_Assert( ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
     PORT_Assert( ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
 
     padding_len = 32 - ((ss->ssl3.nextProto.len + 2) % 32);
 
     rv = ssl3_AppendHandshakeHeader(ss, next_proto, ss->ssl3.nextProto.len +
                                                     2 + padding_len);
     if (rv != SECSuccess) {
         return rv;      /* error code set by AppendHandshakeHeader */
@@ skipping 2054 matching lines @@
             PORT_Free(ss->ssl3.hs.recvdFragments.buf);
         }
     }
 
     ss->ssl3.initialized = PR_FALSE;
 
     SECITEM_FreeItem(&ss->ssl3.nextProto, PR_FALSE);
 }
 
 /* End of ssl3con.c */