support/check_dns_packet.c

   1 /* Check that a DNS packet buffer has the expected contents.
   2    Copyright (C) 2016-2023 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
  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 }