sysdeps/mach/hurd/bind.c

   1 /* Copyright (C) 1992, 1994, 1995, 1996, 1997 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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/socket.h>
  21 #include <hurd.h>
  22 #include <hurd/fd.h>
  23 #include <hurd/socket.h>
  24 #include <hurd/paths.h>
  25 #include <fcntl.h>
  26 #include <stddef.h>
  27 #include <hurd/ifsock.h>
  28 #include <sys/un.h>
  29 #include <string.h>
  30
  31 /* Give the socket FD the local address ADDR (which is LEN bytes long).  */
  32 int
  33 bind (fd, addrarg, len)
  34      int fd;
  35      __CONST_SOCKADDR_ARG addrarg;
  36      size_t len;
  37 {
  38   addr_port_t aport;
  39   error_t err;
  40   struct sockaddr_un *addr = addrarg.__sockaddr_un__;
  41
  42   if (addr->sun_family == AF_LOCAL)
  43     {
  44       /* For the local domain, we must create a node in the filesystem
  45          using the ifsock translator and then fetch the address from it.  */
  46       file_t dir, node;
  47       char name[len - offsetof (struct sockaddr_un, sun_path) + 1], *n;
  48
  49       strncpy (name, addr->sun_path, sizeof name - 1);
  50       name[sizeof name - 1] = '\0'; /* Make sure */
  51
  52       dir = __file_name_split (name, &n);
  53       if (dir == MACH_PORT_NULL)
  54         return -1;
  55
  56       /* Create a new, unlinked node in the target directory.  */
  57       err = __dir_mkfile (dir, O_CREAT, 0666 & ~_hurd_umask, &node);
  58
  59       if (! err)
  60         {
  61           file_t ifsock;
  62           /* Set the node's translator to make it a local-domain socket.  */
  63           err = __file_set_translator (node,
  64                                        FS_TRANS_EXCL | FS_TRANS_SET,
  65                                        FS_TRANS_EXCL | FS_TRANS_SET, 0,
  66                                        _HURD_IFSOCK, sizeof _HURD_IFSOCK,
  67                                        MACH_PORT_NULL,
  68                                        MACH_MSG_TYPE_COPY_SEND);
  69           if (! err)
  70             {
  71               /* Link the node, now a socket, into the target directory.  */
  72               err = __dir_link (dir, node, n, 1);
  73               if (err == EEXIST)
  74                 err = EADDRINUSE;
  75             }
  76           __mach_port_deallocate (__mach_task_self (), node);
  77           if (! err)
  78             {
  79               /* Get a port to the ifsock translator.  */
  80               ifsock = __file_name_lookup_under (dir, n, 0, 0);
  81               if (ifsock == MACH_PORT_NULL)
  82                 {
  83                   err = errno;
  84                   /* If we failed, get rid of the node we created.  */
  85                   __dir_unlink (dir, n);
  86                 }
  87             }
  88           if (! err)
  89             {
  90               /* Get the address port.  */
  91               err = __ifsock_getsockaddr (ifsock, &aport);
  92               if (err == MIG_BAD_ID || err == EOPNOTSUPP)
  93                 /* We are not talking to /hurd/ifsock.  Probably someone
  94                    came in after we linked our node, unlinked it, and
  95                    replaced it with a different node, before we did our
  96                    lookup.  Treat it as if our link had failed with EEXIST.  */
  97                 err = EADDRINUSE;
  98             }
  99           __mach_port_deallocate (__mach_task_self (), ifsock);
 100         }
 101       __mach_port_deallocate (__mach_task_self (), dir);
 102
 103       if (err)
 104         return __hurd_fail (err);
 105     }
 106   else
 107     err = EIEIO;
 108
 109   err = HURD_DPORT_USE (fd,
 110                         ({
 111                           if (err)
 112                             err = __socket_create_address (port,
 113                                                            addr->sun_family,
 114                                                            (char *) addr, len,
 115                                                            &aport);
 116                           if (! err)
 117                             {
 118                               err = __socket_bind (port, aport);
 119                               __mach_port_deallocate (__mach_task_self (),
 120                                                       aport);
 121                             }
 122                           err;
 123                         }));
 124
 125   return err ? __hurd_dfail (fd, err) : 0;
 126 }