summaryrefslogtreecommitdiff
path: root/libnetfs/file-get-translator.c
blob: 7edc8fd0bf7fc19c5615b32bac46bb2d47adf6e5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
/*
   Copyright (C) 1996, 1999, 2000, 2008 Free Software Foundation, Inc.
   Written by Michael I. Bushnell, p/BSG.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */

#include <string.h>
#include <stdio.h>
#include <hurd/paths.h>
#include "netfs.h"
#include "fs_S.h"
#include <sys/mman.h>

error_t
netfs_S_file_get_translator (struct protid *user,
			     char **trans,
			     mach_msg_type_number_t *translen)
{
  struct node *np;
  error_t err;

  if (!user)
    return EOPNOTSUPP;

  np = user->po->np;
  mutex_lock (&np->lock);
  err = netfs_validate_stat (np, user->user);

  if (err)
    {
      mutex_unlock (&np->lock);
      return err;
    }

  if (S_ISLNK (np->nn_stat.st_mode))
    {
      unsigned int len = sizeof _HURD_SYMLINK + np->nn_stat.st_size + 1;

      if (len  > *translen)
	*trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
      memcpy (*trans, _HURD_SYMLINK, sizeof _HURD_SYMLINK);

      err = netfs_attempt_readlink (user->user, np,
				    *trans + sizeof _HURD_SYMLINK);
      if (!err)
	{
	  (*trans)[sizeof _HURD_SYMLINK + np->nn_stat.st_size] = '\0';
	  *translen = len;
	}
    }
  else if (S_ISCHR (np->nn_stat.st_mode) || S_ISBLK (np->nn_stat.st_mode))
    {
      char *buf;
      unsigned int buflen;

      buflen = asprintf (&buf, "%s%c%d%c%d",
			 (S_ISCHR (np->nn_stat.st_mode)
			  ? _HURD_CHRDEV
			  : _HURD_BLKDEV),
			 '\0', major (np->nn_stat.st_rdev),
			 '\0', minor (np->nn_stat.st_rdev));
      if (buflen < 0)
	err = ENOMEM;
      else
	{
	  buflen++;			/* terminating nul */

	  if (buflen > *translen)
	    *trans = mmap (0, buflen, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
	  memcpy (*trans, buf, buflen);
	  free (buf);
	  *translen = buflen;
	  err = 0;
	}
    }
  else if (S_ISFIFO (np->nn_stat.st_mode))
    {
      unsigned int len;

      len = sizeof _HURD_FIFO;
      if (len > *translen)
	*trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
      memcpy (*trans, _HURD_FIFO, sizeof _HURD_FIFO);
      *translen = len;
      err = 0;
    }
  else if (S_ISSOCK (np->nn_stat.st_mode))
    {
      unsigned int len;

      len = sizeof _HURD_IFSOCK;
      if (len > *translen)
        *trans = mmap (0, len, PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
      memcpy (*trans, _HURD_IFSOCK, sizeof _HURD_IFSOCK);
      *translen = len;
      err = 0;
    }
  else
    err = EINVAL;

  mutex_unlock (&np->lock);

  return err;
}