1  /* Test to verify that overlong hostname is rejected by clnt_create
       2     and doesn't cause a buffer overflow (bug  22542).
       3  
       4     Copyright (C) 2022-2023 Free Software Foundation, Inc.
       5     This file is part of the GNU C Library.
       6  
       7     The GNU C Library is free software; you can redistribute it and/or
       8     modify it under the terms of the GNU Lesser General Public
       9     License as published by the Free Software Foundation; either
      10     version 2.1 of the License, or (at your option) any later version.
      11  
      12     The GNU C Library is distributed in the hope that it will be useful,
      13     but WITHOUT ANY WARRANTY; without even the implied warranty of
      14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15     Lesser General Public License for more details.
      16  
      17     You should have received a copy of the GNU Lesser General Public
      18     License along with the GNU C Library; if not, see
      19     <http://www.gnu.org/licenses/>.  */
      20  
      21  #include <errno.h>
      22  #include <rpc/clnt.h>
      23  #include <string.h>
      24  #include <support/check.h>
      25  #include <sys/socket.h>
      26  #include <sys/un.h>
      27  
      28  static int
      29  do_test (void)
      30  {
      31    /* Create an arbitrary hostname that's longer than fits in sun_path.  */
      32    char name [sizeof ((struct sockaddr_un*)0)->sun_path * 2];
      33    memset (name, 'x', sizeof name - 1);
      34    name [sizeof name - 1] = '\0';
      35  
      36    errno = 0;
      37    CLIENT *clnt = clnt_create (name, 0, 0, "unix");
      38  
      39    TEST_VERIFY (clnt == NULL);
      40    TEST_COMPARE (errno, EINVAL);
      41    return 0;
      42  }
      43  
      44  #include <support/test-driver.c>