sysdeps/mach/hurd/bind.c

   1 /* Copyright (C) 1992, 94, 95, 96 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <sys/socket.h>
  22 #include <hurd.h>
  23 #include <hurd/fd.h>
  24 #include <hurd/socket.h>
  25 #include <hurd/paths.h>
  26 #include <fcntl.h>
  27 #include <stddef.h>
  28 #include <hurd/ifsock.h>
  29 #include <sys/un.h>
  30 #include <string.h>
  31
  32 /* Give the socket FD the local address ADDR (which is LEN bytes long).  */
  33 int
  34 DEFUN(bind, (fd, addr, len),
  35       int fd AND const struct sockaddr_un *addr AND size_t len)
  36 {
  37   addr_port_t aport;
  38   error_t err;
  39
  40   if (addr->sun_family == AF_LOCAL)
  41     {
  42       /* For the local domain, we must create a node in the filesystem
  43          using the ifsock translator and then fetch the address from it.  */
  44       file_t dir, node;
  45       char name[len - offsetof (struct sockaddr_un, sun_path) + 1], *n;
  46
  47       strncpy (name, addr->sun_path, sizeof name - 1);
  48       name[sizeof name - 1] = '\0'; /* Make sure */
  49
  50       dir = __file_name_split (name, &n);
  51       if (dir == MACH_PORT_NULL)
  52         return -1;
  53
  54       /* Create a new, unlinked node in the target directory.  */
  55       err = __dir_mkfile (dir, O_CREAT, 0666 & ~_hurd_umask, &node);
  56
  57       if (! err)
  58         {
  59           file_t ifsock;
  60           /* Set the node's translator to make it a local-domain socket.  */
  61           err = __file_set_translator (node,
  62                                        FS_TRANS_EXCL | FS_TRANS_SET,
  63                                        FS_TRANS_EXCL | FS_TRANS_SET, 0,
  64                                        _HURD_IFSOCK, sizeof _HURD_IFSOCK,
  65                                        MACH_PORT_NULL,
  66                                        MACH_MSG_TYPE_COPY_SEND);
  67           if (! err)
  68             {
  69               /* Link the node, now a socket, into the target directory.  */
  70               err = __dir_link (dir, node, n, 1);
  71               if (err == EEXIST)
  72                 err = EADDRINUSE;
  73             }
  74           __mach_port_deallocate (__mach_task_self (), node);
  75           if (! err)
  76             {
  77               /* Get a port to the ifsock translator.  */
  78               ifsock = __file_name_lookup_under (dir, n, 0, 0);
  79               if (ifsock == MACH_PORT_NULL)
  80                 {
  81                   err = errno;
  82                   /* If we failed, get rid of the node we created.  */
  83                   __dir_unlink (dir, n);
  84                 }
  85             }
  86           if (! err)
  87             {
  88               /* Get the address port.  */
  89               err = __ifsock_getsockaddr (ifsock, &aport);
  90               if (err == MIG_BAD_ID || err == EOPNOTSUPP)
  91                 /* We are not talking to /hurd/ifsock.  Probably someone
  92                    came in after we linked our node, unlinked it, and
  93                    replaced it with a different node, before we did our
  94                    lookup.  Treat it as if our link had failed with EEXIST.  */
  95                 err = EADDRINUSE;
  96             }
  97           __mach_port_deallocate (__mach_task_self (), ifsock);
  98         }
  99       __mach_port_deallocate (__mach_task_self (), dir);
 100
 101       if (err)
 102         return __hurd_fail (err);
 103     }
 104   else
 105     err = EIEIO;
 106
 107   err = HURD_DPORT_USE (fd,
 108                         ({
 109                           if (err)
 110                             err = __socket_create_address (port,
 111                                                            addr->sun_family,
 112                                                            (char *) addr, len,
 113                                                            &aport);
 114                           if (! err)
 115                             {
 116                               err = __socket_bind (port, aport);
 117                               __mach_port_deallocate (__mach_task_self (),
 118                                                       aport);
 119                             }
 120                           err;
 121                         }));
 122
 123   return err ? __hurd_dfail (fd, err) : 0;
 124 }