1  /* Test host lookup with double dots at the end, [BZ #16469].
       2     Copyright (C) 2014-2023 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 <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"