1 #include <unistd.h>
2 #include <sys/types.h>
3 #include <fcntl.h>
4 #include <stdlib.h>
5 #include <errno.h>
6 #include <string.h>
7 #include "selinux_internal.h"
8 #include <stdio.h>
9 #include "policy.h"
10 #include "dso.h"
11 #include <limits.h>
12
security_policyvers(void)13 int security_policyvers(void)
14 {
15 int fd, ret;
16 char path[PATH_MAX];
17 char buf[20];
18 unsigned vers = DEFAULT_POLICY_VERSION;
19
20 if (!selinux_mnt) {
21 errno = ENOENT;
22 return -1;
23 }
24
25 snprintf(path, sizeof path, "%s/policyvers", selinux_mnt);
26 fd = open(path, O_RDONLY);
27 if (fd < 0) {
28 if (errno == ENOENT)
29 return vers;
30 else
31 return -1;
32 }
33 memset(buf, 0, sizeof buf);
34 ret = read(fd, buf, sizeof buf - 1);
35 close(fd);
36 if (ret < 0)
37 return -1;
38
39 if (sscanf(buf, "%u", &vers) != 1)
40 return -1;
41
42 return vers;
43 }
44
45 hidden_def(security_policyvers)
46