sysdeps/mach/hurd/bind.c

   1 /* Copyright (C) 1992-2024 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    <https://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 "hurd/hurdsocket.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       char *name = _hurd_sun_path_dupa (addr, len);
  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, ifsock;
  44       char *n;
  45
  46       dir = __file_name_split (name, &n);
  47       if (dir == MACH_PORT_NULL)
  48         return -1;
  49
  50       /* Create a new, unlinked node in the target directory.  */
  51       err = __dir_mkfile (dir, O_CREAT, 0666 & ~_hurd_umask, &node);
  52
  53       if (! err)
  54         {
  55           /* Set the node's translator to make it a local-domain socket.  */
  56           err = __file_set_translator (node,
  57                                        FS_TRANS_EXCL | FS_TRANS_SET,
  58                                        FS_TRANS_EXCL | FS_TRANS_SET, 0,
  59                                        _HURD_IFSOCK, sizeof _HURD_IFSOCK,
  60                                        MACH_PORT_NULL,
  61                                        MACH_MSG_TYPE_COPY_SEND);
  62           if (! err)
  63             {
  64               enum retry_type doretry;
  65               char retryname[1024];
  66               /* Get a port to the ifsock translator.  */
  67               err = __dir_lookup (node, "", 0, 0, &doretry, retryname, &ifsock);
  68               if (! err && (doretry != FS_RETRY_NORMAL || retryname[0] != '\0'))
  69                 err = EADDRINUSE;
  70             }
  71           if (! err)
  72             {
  73               /* Get the address port.  */
  74               err = __ifsock_getsockaddr (ifsock, &aport);
  75               if (err == MIG_BAD_ID || err == EOPNOTSUPP)
  76                 err = EGRATUITOUS;
  77               if (! err)
  78                 {
  79                   /* Link the node, now a socket with proper mode, into the
  80                      target directory.  */
  81                   err = __dir_link (dir, node, n, 1);
  82                   if (err == EEXIST)
  83                     err = EADDRINUSE;
  84                   if (err)
  85                     __mach_port_deallocate (__mach_task_self (), aport);
  86                 }
  87               __mach_port_deallocate (__mach_task_self (), ifsock);
  88             }
  89           __mach_port_deallocate (__mach_task_self (), node);
  90         }
  91       __mach_port_deallocate (__mach_task_self (), dir);
  92
  93       if (err)
  94         return __hurd_fail (err);
  95     }
  96   else
  97     err = EIEIO;
  98
  99   err = HURD_DPORT_USE (fd,
 100                         ({
 101                           if (err)
 102                             err = __socket_create_address (port,
 103                                                            addr->sun_family,
 104                                                            (char *) addr, len,
 105                                                            &aport);
 106                           if (! err)
 107                             {
 108                               err = __socket_bind (port, aport);
 109                               __mach_port_deallocate (__mach_task_self (),
 110                                                       aport);
 111                             }
 112                           err;
 113                         }));
 114
 115   return err ? __hurd_dfail (fd, err) : 0;
 116 }
 117
 118 weak_alias (__bind, bind)