sysdeps/mach/hurd/bind.c

   1 /* Copyright (C) 1992-2014 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    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <sys/socket.h>
  20 #include <hurd.h>
  21 #include <hurd/fd.h>
  22 #include <hurd/socket.h>
  23 #include <hurd/paths.h>
  24 #include <fcntl.h>
  25 #include <stddef.h>
  26 #include <hurd/ifsock.h>
  27 #include <sys/un.h>
  28 #include <string.h>
  29
  30 /* Give the socket FD the local address ADDR (which is LEN bytes long).  */
  31 int
  32 __bind  (int fd, __CONST_SOCKADDR_ARG addrarg, socklen_t len)
  33 {
  34   addr_port_t aport;
  35   error_t err;
  36   const struct sockaddr_un *addr = addrarg.__sockaddr_un__;
  37
  38   if (addr->sun_family == AF_LOCAL)
  39     {
  40       /* For the local domain, we must create a node in the filesystem
  41          using the ifsock translator and then fetch the address from it.  */
  42       file_t dir, node;
  43       char name[len - offsetof (struct sockaddr_un, sun_path) + 1], *n;
  44
  45       strncpy (name, addr->sun_path, sizeof name - 1);
  46       name[sizeof name - 1] = '\0'; /* Make sure */
  47
  48       dir = __file_name_split (name, &n);
  49       if (dir == MACH_PORT_NULL)
  50         return -1;
  51
  52       /* Create a new, unlinked node in the target directory.  */
  53       err = __dir_mkfile (dir, O_CREAT, 0666 & ~_hurd_umask, &node);
  54
  55       if (! err)
  56         {
  57           /* Set the node's translator to make it a local-domain socket.  */
  58           err = __file_set_translator (node,
  59                                        FS_TRANS_EXCL | FS_TRANS_SET,
  60                                        FS_TRANS_EXCL | FS_TRANS_SET, 0,
  61                                        _HURD_IFSOCK, sizeof _HURD_IFSOCK,
  62                                        MACH_PORT_NULL,
  63                                        MACH_MSG_TYPE_COPY_SEND);
  64           if (! err)
  65             {
  66               /* Link the node, now a socket, into the target directory.  */
  67               err = __dir_link (dir, node, n, 1);
  68               if (err == EEXIST)
  69                 err = EADDRINUSE;
  70             }
  71           __mach_port_deallocate (__mach_task_self (), node);
  72           if (! err)
  73             {
  74               /* Get a port to the ifsock translator.  */
  75               file_t ifsock = __file_name_lookup_under (dir, n, 0, 0);
  76               if (ifsock == MACH_PORT_NULL)
  77                 {
  78                   err = errno;
  79                   /* If we failed, get rid of the node we created.  */
  80                   __dir_unlink (dir, n);
  81                 }
  82               else
  83                 {
  84                   /* Get the address port.  */
  85                   err = __ifsock_getsockaddr (ifsock, &aport);
  86                   if (err == MIG_BAD_ID || err == EOPNOTSUPP)
  87                     /* We are not talking to /hurd/ifsock.  Probably
  88                        someone came in after we linked our node, unlinked
  89                        it, and replaced it with a different node, before we
  90                        did our lookup.  Treat it as if our link had failed
  91                        with EEXIST.  */
  92                     err = EADDRINUSE;
  93                 }
  94               __mach_port_deallocate (__mach_task_self (), ifsock);
  95             }
  96         }
  97       __mach_port_deallocate (__mach_task_self (), dir);
  98
  99       if (err)
 100         return __hurd_fail (err);
 101     }
 102   else
 103     err = EIEIO;
 104
 105   err = HURD_DPORT_USE (fd,
 106                         ({
 107                           if (err)
 108                             err = __socket_create_address (port,
 109                                                            addr->sun_family,
 110                                                            (char *) addr, len,
 111                                                            &aport);
 112                           if (! err)
 113                             {
 114                               err = __socket_bind (port, aport);
 115                               __mach_port_deallocate (__mach_task_self (),
 116                                                       aport);
 117                             }
 118                           err;
 119                         }));
 120
 121   return err ? __hurd_dfail (fd, err) : 0;
 122 }
 123
 124 weak_alias (__bind, bind)