Initial "opaque SSL" framework. If an application defines

OPENSSL_NO_SSL_INTERN all ssl related structures are opaque
and internals cannot be directly accessed. Many applications
will need some modification to support this and most likely some
additional functions added to OpenSSL.

The advantage of this option is that any application supporting
it will still be binary compatible if SSL structures change.

ssl/ssl2.h

@@ -155,6 +155,8 @@ extern "C" {
 #define  CERT		char
 #endif
 
+#ifndef OPENSSL_NO_SSL_INTERN
+
 typedef struct ssl2_state_st
 	{
 	int three_byte_header;
@@ -219,6 +221,8 @@ typedef struct ssl2_state_st
 		} tmp;
 	} SSL2_STATE;
 
+#endif
+
 /* SSLv2 */
 /* client */
 #define SSL2_ST_SEND_CLIENT_HELLO_A		(0x10|SSL_ST_CONNECT)