posix/tst-getaddrinfo5.c

   1 /* Test host lookup with double dots at the end, [BZ #16469].
   2    Copyright (C) 2014-2022 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 <sys/types.h>
  20 #include <sys/socket.h>
  21 #include <netdb.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 static int
  26 test (void)
  27 {
  28   static char host1[] = "localhost..";
  29   static char host2[] = "www.gnu.org..";
  30   static char *hosts[] = { host1, host2 };
  31   int i;
  32   int pass = 0;
  33
  34   for (i = 0; i < sizeof (hosts) / sizeof (*hosts); i++)
  35     {
  36       char *host = hosts[i];
  37       size_t len = strlen (host);
  38       struct addrinfo *ai;
  39
  40       /* If the name doesn't resolve with a single dot at the
  41          end, skip it.  */
  42       host[len-1] = 0;
  43       if (getaddrinfo (host, NULL, NULL, &ai) != 0)
  44         {
  45           printf ("resolving \"%s\" failed, skipping this hostname\n", host);
  46           continue;
  47         }
  48       printf ("resolving \"%s\" worked, proceeding to test\n", host);
  49       freeaddrinfo (ai);
  50
  51       /* If it resolved with a single dot, check that it doesn't with
  52          a second trailing dot.  */
  53       host[len-1] = '.';
  54       if (getaddrinfo (host, NULL, NULL, &ai) == 0)
  55         {
  56           printf ("resolving \"%s\" worked, test failed\n", host);
  57           return 1;
  58         }
  59       printf ("resolving \"%s\" failed, test passed\n", host);
  60       pass = 1;
  61     }
  62
  63   /* We want at least one successful name resolution for the test to
  64      succeed.  */
  65   return pass ? 0 : 2;
  66 }
  67
  68 #define TEST_FUNCTION test ()
  69 #include "../test-skeleton.c"