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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/*
Copyright (C) 1993, 1994 Free Software Foundation
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 the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by Michael I. Bushnell. */
#include "priv.h"
#include "fsys_S.h"
#include <hurd/fsys.h>
#include <fcntl.h>
/* Implement fsys_getroot as described in <hurd/fsys.defs>. */
kern_return_t
diskfs_S_fsys_getroot (fsys_t controlport,
uid_t *uids,
u_int nuids,
uid_t *gids,
u_int ngids,
int flags,
retry_type *retry,
char *retryname,
file_t *returned_port,
mach_msg_type_name_t *returned_port_poly)
{
struct port_info *pt = ports_check_port_type (controlport, PT_CTL);
error_t error = 0;
mode_t type;
struct protid pseudocred;
if (!pt)
return EOPNOTSUPP;
mutex_lock (&diskfs_root_node->lock);
/* This code is similar (but not the same as) the code in
dir-pathtrans.c that does the same thing. Perhaps a way should
be found to share the logic. */
type = diskfs_root_node->dn_stat.st_mode & S_IFMT;
if ((diskfs_node_translated (diskfs_root_node)
|| diskfs_root_node->translator.control != MACH_PORT_NULL)
&& !(flags & O_NOTRANS))
{
/* If this is translated, start the translator (if necessary)
and use it. */
mach_port_t childcontrol = diskfs_root_node->translator.control;
if (childcontrol == MACH_PORT_NULL)
{
if (error = diskfs_start_translator (diskfs_root_node,
diskfs_dotdot_file))
{
mutex_unlock (&diskfs_root_node->lock);
return error;
}
}
mutex_unlock (&diskfs_root_node->lock);
error = fsys_getroot (childcontrol, uids, nuids, gids, ngids,
flags, retry, retryname, returned_port);
if (!error && returned_port != MACH_PORT_NULL)
*returned_port_poly = MACH_MSG_TYPE_MOVE_SEND;
else
*returned_port_poly = MACH_MSG_TYPE_COPY_SEND;
return error;
}
if (type == S_IFLNK && !(flags & (O_NOLINK | O_NOTRANS)))
{
/* Handle symlink interpretation */
char pathbuf[diskfs_root_node->dn_stat.st_size + 1];
int amt;
error = diskfs_node_rdwr (diskfs_root_node, pathbuf, 0,
diskfs_root_node->dn_stat.st_size, 0,
0, &amt);
pathbuf[amt] = '\0';
mutex_unlock (&diskfs_root_node->lock);
if (error)
return error;
if (pathbuf[0] == '/')
{
*retry = FS_RETRY_NORMAL;
*returned_port = MACH_PORT_NULL;
*returned_port_poly = MACH_MSG_TYPE_COPY_SEND;
strcpy (retryname, pathbuf);
return 0;
}
else
{
*retry = FS_RETRY_REAUTH;
*returned_port = diskfs_dotdot_file;
*returned_port_poly = MACH_MSG_TYPE_COPY_SEND;
strcpy (retryname, pathbuf);
return 0;
}
}
if ((type == S_IFSOCK || type == S_IFBLK
|| type == S_IFCHR || type == S_IFIFO)
&& (flags & (O_READ|O_WRITE|O_EXEC)))
error = EOPNOTSUPP;
/* diskfs_access requires a cred; so we give it one. */
pseudocred.uids = uids;
pseudocred.gids = gids;
pseudocred.nuids = nuids;
pseudocred.ngids = ngids;
if (!error && (flags & O_READ))
error = diskfs_access (diskfs_root_node, S_IREAD, &pseudocred);
if (!error && (flags & O_EXEC))
error = diskfs_access (diskfs_root_node, S_IEXEC, &pseudocred);
if (!error && (flags & (O_WRITE)))
{
if (type == S_IFDIR)
error = EISDIR;
else if (diskfs_readonly)
error = EROFS;
else
error = diskfs_access (diskfs_root_node, S_IWRITE, &pseudocred);
}
if (error)
{
mutex_unlock (&diskfs_root_node->lock);
return error;
}
flags &= ~(O_READ | O_WRITE | O_EXEC); /* XXX wrong */
*returned_port = (ports_get_right
(diskfs_make_protid
(diskfs_make_peropen (diskfs_root_node, flags),
uids, nuids, gids, ngids)));
*returned_port_poly = MACH_MSG_TYPE_MAKE_SEND;
mutex_unlock (&diskfs_root_node->lock);
ports_done_with_port (pt);
return 0;
}
|
