Check whether IP_MTU is defined.

[meshlink] / src / utcp-test.c

diff --git a/src/utcp-test.c b/src/utcp-test.c
index 992e6f0f9b1952673705a5015601e866ceb12bda..f48ac6948431a0f640895c76a54c0ca078363c8d 100644 (file)
--- a/src/utcp-test.c
+++ b/src/utcp-test.c
@@ -1,16 +1,25 @@
-#define _GNU_SOURCE
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <time.h>
-#include <errno.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netdb.h>
+/*
+    utcp-test.c -- Test application for UTCP
+    Copyright (C) 2014-2020 Guus Sliepen <guus@tinc-vpn.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "system.h"
 #include <poll.h>
-
+#include <time.h>
 
 #include "utcp.h"
 
@@ -148,11 +157,15 @@ static ssize_t do_send(struct utcp *utcp, const void *data, size_t len) {
 }
 
 static void set_mtu(struct utcp *u, int s) {
+#ifdef IP_MTU
+
        if(!mtu) {
                socklen_t optlen = sizeof(mtu);
                getsockopt(s, IPPROTO_IP, IP_MTU, &mtu, &optlen);
        }
 
+#endif
+
        if(!mtu || mtu == 65535) {
                mtu = 1500;
        }