Backport of TLS extension code to OpenSSL 0.9.8.

Include server name and RFC4507bis support.

This is not compiled in by default and must be explicitly enabled with
the Configure option enable-tlsext

ssl/s23_clnt.c

@@ -360,6 +360,13 @@ static int ssl23_client_hello(SSL *s)
 				*(p++)=comp->id;
 				}
 			*(p++)=0; /* Add the NULL method */
+#ifndef OPENSSL_NO_TLSEXT
+			if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
+				{
+				SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
+				return -1;
+				}
+#endif
 			
 			l = p-d;
 			*p = 42;