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
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
*
* This program 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 version 2 of the License.
*
* This program 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "udev.h"
#include "udev_selinux.h"
int create_path(const char *path)
{
char p[PATH_SIZE];
char *pos;
struct stat stats;
int ret;
strlcpy(p, path, sizeof(p));
pos = strrchr(p, '/');
if (pos == p || pos == NULL)
return 0;
while (pos[-1] == '/')
pos--;
pos[0] = '\0';
dbg("stat '%s'\n", p);
if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
return 0;
if (create_path(p) != 0)
return -1;
dbg("mkdir '%s'\n", p);
selinux_setfscreatecon(p, NULL, S_IFDIR|0755);
ret = mkdir(p, 0755);
selinux_resetfscreatecon();
if (ret == 0)
return 0;
if (errno == EEXIST)
if (stat(p, &stats) == 0 && (stats.st_mode & S_IFMT) == S_IFDIR)
return 0;
return -1;
}
int delete_path(const char *path)
{
char p[PATH_SIZE];
char *pos;
int retval;
strcpy (p, path);
pos = strrchr(p, '/');
if (pos == p || pos == NULL)
return 0;
while (1) {
*pos = '\0';
pos = strrchr(p, '/');
/* don't remove the last one */
if ((pos == p) || (pos == NULL))
break;
/* remove if empty */
retval = rmdir(p);
if (errno == ENOENT)
retval = 0;
if (retval) {
if (errno == ENOTEMPTY)
return 0;
err("rmdir(%s) failed: %s\n", p, strerror(errno));
break;
}
dbg("removed '%s'\n", p);
}
return 0;
}
/* Reset permissions on the device node, before unlinking it to make sure,
* that permisions of possible hard links will be removed too.
*/
int unlink_secure(const char *filename)
{
int retval;
retval = chown(filename, 0, 0);
if (retval)
err("chown(%s, 0, 0) failed: %s\n", filename, strerror(errno));
retval = chmod(filename, 0000);
if (retval)
err("chmod(%s, 0000) failed: %s\n", filename, strerror(errno));
retval = unlink(filename);
if (errno == ENOENT)
retval = 0;
if (retval)
err("unlink(%s) failed: %s\n", filename, strerror(errno));
return retval;
}
int file_map(const char *filename, char **buf, size_t *bufsize)
{
struct stat stats;
int fd;
fd = open(filename, O_RDONLY);
if (fd < 0) {
return -1;
}
if (fstat(fd, &stats) < 0) {
close(fd);
return -1;
}
*buf = mmap(NULL, stats.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (*buf == MAP_FAILED) {
close(fd);
return -1;
}
*bufsize = stats.st_size;
close(fd);
return 0;
}
void file_unmap(void *buf, size_t bufsize)
{
munmap(buf, bufsize);
}
/* return number of chars until the next newline, skip escaped newline */
size_t buf_get_line(const char *buf, size_t buflen, size_t cur)
{
int escape = 0;
size_t count;
for (count = cur; count < buflen; count++) {
if (!escape && buf[count] == '\n')
break;
if (buf[count] == '\\')
escape = 1;
else
escape = 0;
}
return count - cur;
}
|
