1 files changed, 77 insertions, 0 deletions

diff --git a/src/lib/util/test_tun.c b/src/lib/util/test_tun.c
new file mode 100644
index 000000000..1086ef3ca
--- /dev/null
+++ b/src/lib/util/test_tun.c
@@ -0,0 +1,77 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2010, 2011, 2012 Christian Grothoff
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     or (at your option) any later version.
+
+     GNUnet 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
+     Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+
+/**
+ * @file tun/test_tun.c
+ * @brief test for tun.c
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+
+static int ret;
+
+static void
+test_udp (size_t pll,
+          int pl_fill,
+          uint16_t crc)
+{
+  struct GNUNET_TUN_IPv4Header ip;
+  struct GNUNET_TUN_UdpHeader udp;
+  char payload[pll];
+  struct in_addr src;
+  struct in_addr dst;
+
+  GNUNET_assert (1 == inet_pton (AF_INET, "1.2.3.4", &src));
+  GNUNET_assert (1 == inet_pton (AF_INET, "122.2.3.5", &dst));
+  memset (payload, pl_fill, sizeof(payload));
+  GNUNET_TUN_initialize_ipv4_header (&ip,
+                                     IPPROTO_UDP,
+                                     pll + sizeof(udp),
+                                     &src,
+                                     &dst);
+  udp.source_port = htons (4242);
+  udp.destination_port = htons (4242);
+  udp.len = htons (pll);
+  GNUNET_TUN_calculate_udp4_checksum (&ip,
+                                      &udp,
+                                      payload,
+                                      pll);
+  if (crc != ntohs (udp.crc))
+  {
+    fprintf (stderr, "Got CRC: %u, wanted: %u\n",
+             ntohs (udp.crc),
+             crc);
+    ret = 1;
+  }
+}
+
+
+int
+main (int argc,
+      char **argv)
+{
+  test_udp (4, 3, 22439);
+  test_udp (4, 1, 23467);
+  test_udp (7, 17, 6516);
+  test_udp (12451, 251, 42771);
+  return ret;
+}