add option to disable TLS

change dialog test to use TCP if TLS is not available.
Indeed, because of server forwarding statelessly from UDP to TCP, there are unusal BYE retransmissions that generate dialog-unhandled BYE request.

configure.ac

@@ -101,8 +101,18 @@ fi
 AC_SUBST(ANTLR_CFLAGS)
 AC_SUBST(ANTLR_LIBS)
 
-PKG_CHECK_MODULES(GNUTLS, gnutls, [found_gnutls=yes],foo=bar)
-#PKG_CHECK_MODULES(OPENSSL, openssl, [found_openssl=yes],foo=bar)
+AC_ARG_ENABLE(	tls,
+		[  --enable-tls		Enable TLS support (default=yes)],
+		[case "${enableval}" in
+		yes) use_tls=true ;;
+		no)  use_tls=false ;;
+		*) AC_MSG_ERROR(bad value ${enableval} for --enable-tls) ;;
+		esac],[use_tls=true])
+
+if test "$use_tls" = "true" ; then
+	PKG_CHECK_MODULES(GNUTLS, gnutls, [found_gnutls=yes],
+		[AC_MSG_ERROR([Gnutls not found. You can use --disable-tls to turn tls support off.])] )
+fi
 
 AM_CONDITIONAL([BUILD_TLS], [test "x$found_gnutls" = "xyes" || test "x$found_openssl" = "xyes"])
 TLS_CFLAGS=""

tester/belle_sip_dialog_tester.c

@@ -289,7 +289,7 @@ static void do_simple_call(void) {
 	if (belle_sip_provider_get_listening_point(prov, "tls")) {
 		marie_register_req=register_user(stack, prov, "TLS" ,1 ,CALLEE,NULL);
 	} else {
-		marie_register_req=register_user(stack, prov, "UDP" ,1 ,CALLEE,NULL);
+		marie_register_req=register_user(stack, prov, "TCP" ,1 ,CALLEE,NULL);
 	}
 
 	from=belle_sip_header_address_create(NULL,belle_sip_uri_create(CALLER,test_domain));