sysdeps/mach/hurd/bind.c

   1 /* Copyright (C) 1992-2015 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, ifsock;
  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               enum retry_type doretry;
  67               char retryname[1024];
  68               /* Get a port to the ifsock translator.  */
  69               err = __dir_lookup (node, "", 0, 0, &doretry, retryname, &ifsock);
  70               if (! err && (doretry != FS_RETRY_NORMAL || retryname[0] != '\0'))
  71                 err = EADDRINUSE;
  72             }
  73           if (! err)
  74             {
  75               /* Get the address port.  */
  76               err = __ifsock_getsockaddr (ifsock, &aport);
  77               if (err == MIG_BAD_ID || err == EOPNOTSUPP)
  78                 err = EGRATUITOUS;
  79               if (! err)
  80                 {
  81                   /* Link the node, now a socket with proper mode, into the
  82                      target directory.  */
  83                   err = __dir_link (dir, node, n, 1);
  84                   if (err == EEXIST)
  85                     err = EADDRINUSE;
  86                   if (err)
  87                     __mach_port_deallocate (__mach_task_self (), aport);
  88                 }
  89               __mach_port_deallocate (__mach_task_self (), ifsock);
  90             }
  91           __mach_port_deallocate (__mach_task_self (), node);
  92         }
  93       __mach_port_deallocate (__mach_task_self (), dir);
  94
  95       if (err)
  96         return __hurd_fail (err);
  97     }
  98   else
  99     err = EIEIO;
 100
 101   err = HURD_DPORT_USE (fd,
 102                         ({
 103                           if (err)
 104                             err = __socket_create_address (port,
 105                                                            addr->sun_family,
 106                                                            (char *) addr, len,
 107                                                            &aport);
 108                           if (! err)
 109                             {
 110                               err = __socket_bind (port, aport);
 111                               __mach_port_deallocate (__mach_task_self (),
 112                                                       aport);
 113                             }
 114                           err;
 115                         }));
 116
 117   return err ? __hurd_dfail (fd, err) : 0;
 118 }
 119
 120 weak_alias (__bind, bind)