1  /* Copyright (C) 1994-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <errno.h>
      19  #include <sys/socket.h>
      20  #include <sys/un.h>
      21  #include <hurd.h>
      22  #include <hurd/fd.h>
      23  #include <hurd/ifsock.h>
      24  #include <hurd/socket.h>
      25  #include <sysdep-cancel.h>
      26  #include "hurd/hurdsocket.h"
      27  
      28  /* Send N bytes of BUF on socket FD to peer at address ADDR (which is
      29     ADDR_LEN bytes long).  Returns the number sent, or -1 for errors.  */
      30  ssize_t
      31  __sendto (int fd,
      32  	  const void *buf,
      33  	  size_t n,
      34  	  int flags,
      35  	  const struct sockaddr_un *addr,
      36  	  socklen_t addr_len)
      37  {
      38    addr_port_t aport = MACH_PORT_NULL;
      39    error_t err;
      40    vm_size_t wrote;
      41  
      42    /* Get an address port for the desired destination address.  */
      43    error_t create_address_port (io_t port,
      44  			       const struct sockaddr_un *addr,
      45  			       socklen_t addr_len,
      46  			       addr_port_t *aport)
      47      {
      48        error_t err_port;
      49  
      50        if (addr->sun_family == AF_LOCAL)
      51  	{
      52  	  char *name = _hurd_sun_path_dupa (addr, addr_len);
      53  	  /* For the local domain, we must look up the name as a file and talk
      54  	     to it with the ifsock protocol.  */
      55  	  file_t file = __file_name_lookup (name, 0, 0);
      56  	  if (file == MACH_PORT_NULL)
      57  	    return errno;
      58  	  err_port = __ifsock_getsockaddr (file, aport);
      59  	  __mach_port_deallocate (__mach_task_self (), file);
      60  	  if (err_port == MIG_BAD_ID || err_port == EOPNOTSUPP)
      61  	    /* The file did not grok the ifsock protocol.  */
      62  	    err_port = ENOTSOCK;
      63  	}
      64        else
      65  	{
      66  	  err_port = __socket_create_address (port,
      67  					      addr->sun_family,
      68  					      (char *) addr,
      69  					      addr_len,
      70  					      aport);
      71  	}
      72  
      73        return err_port;
      74      }
      75  
      76    err = HURD_DPORT_USE_CANCEL (fd,
      77  			({
      78  			  if (addr != NULL)
      79  			    err = create_address_port (port, addr, addr_len,
      80  						       &aport);
      81  			  else
      82  			    err = 0;
      83  			  if (! err)
      84  			    {
      85  			      /* Send the data.  */
      86  			      int cancel_oldtype = LIBC_CANCEL_ASYNC();
      87  			      err = __socket_send (port, aport,
      88  						   flags, buf, n,
      89  						   NULL,
      90  						   MACH_MSG_TYPE_COPY_SEND, 0,
      91  						   NULL, 0, &wrote);
      92  			      LIBC_CANCEL_RESET (cancel_oldtype);
      93  			    }
      94  			  err;
      95  			}));
      96  
      97    if (MACH_PORT_VALID (aport))
      98      __mach_port_deallocate (__mach_task_self (), aport);
      99  
     100    return err ? __hurd_sockfail (fd, flags, err) : wrote;
     101  }
     102  
     103  weak_alias (__sendto, sendto)