1 /* Check that a DNS packet buffer has the expected contents.
2 Copyright (C) 2016-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <support/check_nss.h>
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <support/check.h>
25 #include <support/format_nss.h>
26 #include <support/run_diff.h>
27
28 void
check_dns_packet(const char * query_description,const unsigned char * buffer,size_t length,const char * expected)29 check_dns_packet (const char *query_description,
30 const unsigned char *buffer, size_t length,
31 const char *expected)
32 {
33 char *formatted = support_format_dns_packet (buffer, length);
34 if (strcmp (formatted, expected) != 0)
35 {
36 support_record_failure ();
37 printf ("error: packet comparison failure\n");
38 if (query_description != NULL)
39 printf ("query: %s\n", query_description);
40 support_run_diff ("expected", expected, "actual", formatted);
41 }
42 free (formatted);
43 }
44