resolv/tst-ns_name_compress.c

   1 /* Test ns_name_compress corner cases.
   2    Copyright (C) 2017-2024 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 <resolv.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <support/check.h>
  23 #include <support/support.h>
  24
  25 /* Check that we can process names which fit into the destination
  26    buffer exactly.  See bug 21359.  */
  27 static void
  28 test_exact_fit (const char *name, size_t length)
  29 {
  30   unsigned char *buf = xmalloc (length + 1);
  31   memset (buf, '$', length + 1);
  32   enum { ptr_count = 5 };
  33   const unsigned char *dnptrs[ptr_count] = { buf, };
  34   int ret = ns_name_compress (name, buf, length,
  35                           dnptrs, dnptrs + ptr_count);
  36   if (ret < 0)
  37     {
  38       support_record_failure ();
  39       printf ("error: ns_name_compress for %s/%zu failed\n", name, length);
  40       return;
  41     }
  42   if ((size_t) ret != length)
  43     {
  44       support_record_failure ();
  45       printf ("error: ns_name_compress for %s/%zu result mismatch: %d\n",
  46               name, length, ret);
  47     }
  48   if (buf[length] != '$')
  49     {
  50       support_record_failure ();
  51       printf ("error: ns_name_compress for %s/%zu padding write\n",
  52               name, length);
  53     }
  54   free (buf);
  55 }
  56
  57 static int
  58 do_test (void)
  59 {
  60   test_exact_fit ("abc", 5);
  61   test_exact_fit ("abc.", 5);
  62   {
  63     char long_name[]
  64       = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa."
  65       "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa."
  66       "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa."
  67       "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.";
  68     TEST_VERIFY (strlen (long_name) == NS_MAXCDNAME - 1);
  69     test_exact_fit (long_name, NS_MAXCDNAME);
  70     long_name[sizeof (long_name) - 1] = '\0';
  71     test_exact_fit (long_name, NS_MAXCDNAME);
  72   }
  73   return 0;
  74 }
  75
  76 #include <support/test-driver.c>