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
|
/* Usermux leaf node functions
Copyright (C) 1997 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
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 <stdio.h>
#include <string.h>
#include <pwd.h>
#include <argz.h>
#include <hurd/paths.h>
#include "usermux.h"
/* Read the contents of NODE (a symlink), for USER, into BUF. */
error_t
netfs_attempt_readlink (struct iouser *user, struct node *node, char *buf)
{
assert (node->nn->name);
/* For symlink nodes, the translator spec just contains the link target. */
memcpy (buf, node->nn->trans, node->nn->trans_len);
fshelp_touch (&node->nn_stat, TOUCH_ATIME, usermux_maptime);
return 0;
}
/* For locked node NODE with S_IPTRANS set in its mode, look up the name of
its translator. Store the name into newly malloced storage, and return it
in *ARGZ; set *ARGZ_LEN to the total length.
For usermux, this creates a new translator string by instantiating the
global translator template. */
error_t
netfs_get_translator (struct node *node, char **trans, size_t *trans_len)
{
if (! node->nn->name)
return EINVAL;
else
{
fshelp_touch (&node->nn_stat, TOUCH_ATIME, usermux_maptime);
*trans = 0;
*trans_len = 0;
if (S_ISLNK (node->nn_stat.st_mode))
argz_add (trans, trans_len, _HURD_SYMLINK);
return
argz_append (trans, trans_len, node->nn->trans, node->nn->trans_len);
}
}
/* Create a new leaf node in MUX, with a name NAME, and return the new node
with a single reference in NODE. */
error_t
create_user_node (struct usermux *mux, struct usermux_name *name,
struct passwd *pw, struct node **node)
{
error_t err;
struct node *new;
struct netnode *nn = malloc (sizeof (struct netnode));
if (! nn)
return ENOMEM;
nn->mux = mux;
nn->name = name;
new = netfs_make_node (nn);
if (! new)
{
free (nn);
return ENOMEM;
}
new->nn_stat = mux->stat_template;
new->nn_stat.st_ino = pw->pw_uid + USERMUX_FILENO_UID_OFFSET;
if (strcmp (mux->trans_template, _HURD_SYMLINK) == 0
&& mux->trans_template_len == sizeof _HURD_SYMLINK)
{
err = argz_create_sep (pw->pw_dir, 0, &nn->trans, &nn->trans_len);
new->nn_stat.st_mode = (S_IFLNK | 0666);
new->nn_stat.st_size = nn->trans_len;
}
else
{
unsigned replace_count = 0;
nn->trans = 0; /* Initialize return value. */
nn->trans_len = 0;
err = argz_append (&nn->trans, &nn->trans_len,
mux->trans_template, mux->trans_template_len);
/* Perform any substitutions. */
if (!err && mux->user_pat && *mux->user_pat)
err = argz_replace (&nn->trans, &nn->trans_len,
mux->user_pat, pw->pw_name,
&replace_count);
if (!err && mux->home_pat && *mux->home_pat)
err = argz_replace (&nn->trans, &nn->trans_len,
mux->home_pat, pw->pw_dir,
&replace_count);
if (!err && mux->uid_pat && *mux->uid_pat)
{
char uid_buf[10];
snprintf (uid_buf, sizeof uid_buf, "%d", pw->pw_uid);
err = argz_replace (&nn->trans, &nn->trans_len,
mux->uid_pat, uid_buf,
&replace_count);
}
if (!err && replace_count == 0)
/* Default, if no instances of any pattern occur, is to append the
user home dir. */
err = argz_add (&nn->trans, &nn->trans_len, pw->pw_dir);
if (err && nn->trans_len > 0)
free (nn->trans);
new->nn_stat.st_mode = (S_IFREG | S_IPTRANS | 0666);
new->nn_stat.st_size = 0;
}
if (err)
{
free (nn);
free (new);
return err;
}
fshelp_touch (&new->nn_stat, TOUCH_ATIME|TOUCH_MTIME|TOUCH_CTIME,
usermux_maptime);
name->node = new;
*node = new;
return 0;
}
|
