1  /* Copyright (C) 1992-2023 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)