1  /* Fetch the host's network interface list.  Hurd version.
       2     Copyright (C) 2002-2023 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 <ifreq.h>
      20  #include <hurd.h>
      21  #include <hurd/pfinet.h>
      22  #include <sys/mman.h>
      23  
      24  
      25  void
      26  __ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
      27  {
      28    file_t server;
      29  
      30    server = _hurd_socket_server (PF_INET, 0);
      31    if (server == MACH_PORT_NULL)
      32      {
      33      out:
      34        *num_ifs = 0;
      35        *ifreqs = NULL;
      36      }
      37    else
      38      {
      39        char *data = NULL;
      40        mach_msg_type_number_t len = 0;
      41        error_t err = __pfinet_siocgifconf (server, -1, &data, &len);
      42        if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
      43  	{
      44  	  /* On the first use of the socket server during the operation,
      45  	     allow for the old server port dying.  */
      46  	  server = _hurd_socket_server (PF_INET, 1);
      47  	  if (server == MACH_PORT_NULL)
      48  	    goto out;
      49  	  err = __pfinet_siocgifconf (server, -1, (data_t *) ifreqs, &len);
      50  	}
      51        if (err)
      52  	goto out;
      53  
      54        if (len % sizeof (struct ifreq) != 0)
      55  	{
      56  	  __munmap (data, len);
      57  	  __hurd_fail (EGRATUITOUS);
      58  	  goto out;
      59  	}
      60        *num_ifs = len / sizeof (struct ifreq);
      61        *ifreqs = (struct ifreq *) data;
      62      }
      63  
      64  }