sysdeps/mach/hurd/bind.c

   1 /* Copyright (C) 1992,94,95,96,97,98,2001,02 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    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  (int fd, __CONST_SOCKADDR_ARG addrarg, socklen_t len)
  34 {
  35   addr_port_t aport;
  36   error_t err;
  37   const struct sockaddr_un *addr = addrarg.__sockaddr_un__;
  38
  39   if (addr->sun_family == AF_LOCAL)
  40     {
  41       /* For the local domain, we must create a node in the filesystem
  42          using the ifsock translator and then fetch the address from it.  */
  43       file_t dir, node;
  44       char name[len - offsetof (struct sockaddr_un, sun_path) + 1], *n;
  45
  46       strncpy (name, addr->sun_path, sizeof name - 1);
  47       name[sizeof name - 1] = '\0'; /* Make sure */
  48
  49       dir = __file_name_split (name, &n);
  50       if (dir == MACH_PORT_NULL)
  51         return -1;
  52
  53       /* Create a new, unlinked node in the target directory.  */
  54       err = __dir_mkfile (dir, O_CREAT, 0666 & ~_hurd_umask, &node);
  55
  56       if (! err)
  57         {
  58           /* Set the node's translator to make it a local-domain socket.  */
  59           err = __file_set_translator (node,
  60                                        FS_TRANS_EXCL | FS_TRANS_SET,
  61                                        FS_TRANS_EXCL | FS_TRANS_SET, 0,
  62                                        _HURD_IFSOCK, sizeof _HURD_IFSOCK,
  63                                        MACH_PORT_NULL,
  64                                        MACH_MSG_TYPE_COPY_SEND);
  65           if (! err)
  66             {
  67               /* Link the node, now a socket, into the target directory.  */
  68               err = __dir_link (dir, node, n, 1);
  69               if (err == EEXIST)
  70                 err = EADDRINUSE;
  71             }
  72           __mach_port_deallocate (__mach_task_self (), node);
  73           if (! err)
  74             {
  75               /* Get a port to the ifsock translator.  */
  76               file_t ifsock = __file_name_lookup_under (dir, n, 0, 0);
  77               if (ifsock == MACH_PORT_NULL)
  78                 {
  79                   err = errno;
  80                   /* If we failed, get rid of the node we created.  */
  81                   __dir_unlink (dir, n);
  82                 }
  83               else
  84                 {
  85                   /* Get the address port.  */
  86                   err = __ifsock_getsockaddr (ifsock, &aport);
  87                   if (err == MIG_BAD_ID || err == EOPNOTSUPP)
  88                     /* We are not talking to /hurd/ifsock.  Probably
  89                        someone came in after we linked our node, unlinked
  90                        it, and replaced it with a different node, before we
  91                        did our lookup.  Treat it as if our link had failed
  92                        with EEXIST.  */
  93                     err = EADDRINUSE;
  94                 }
  95               __mach_port_deallocate (__mach_task_self (), ifsock);
  96             }
  97         }
  98       __mach_port_deallocate (__mach_task_self (), dir);
  99
 100       if (err)
 101         return __hurd_fail (err);
 102     }
 103   else
 104     err = EIEIO;
 105
 106   err = HURD_DPORT_USE (fd,
 107                         ({
 108                           if (err)
 109                             err = __socket_create_address (port,
 110                                                            addr->sun_family,
 111                                                            (char *) addr, len,
 112                                                            &aport);
 113                           if (! err)
 114                             {
 115                               err = __socket_bind (port, aport);
 116                               __mach_port_deallocate (__mach_task_self (),
 117                                                       aport);
 118                             }
 119                           err;
 120                         }));
 121
 122   return err ? __hurd_dfail (fd, err) : 0;
 123 }
 124
 125 weak_alias (__bind, bind)