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#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <dlfcn.h>
#include <sys/vfs.h>
#include <stdint.h>
#include <limits.h>
#include "dso.h"
#include "policy.h"
#include "selinux_internal.h"
#include "setrans_internal.h"
char *selinux_mnt = NULL;
int selinux_page_size = 0;
int obj_class_compat = 1;
static void init_selinuxmnt(void)
{
char *buf=NULL, *p;
FILE *fp;
struct statfs sfbuf;
int rc;
size_t len;
ssize_t num;
int exists = 0;
if (selinux_mnt)
return;
/* We check to see if the preferred mount point for selinux file
* system has a selinuxfs. */
do {
rc = statfs(SELINUXMNT, &sfbuf);
} while (rc < 0 && errno == EINTR);
if (rc == 0) {
if ((uint32_t)sfbuf.f_type == (uint32_t)SELINUX_MAGIC) {
selinux_mnt = strdup(SELINUXMNT);
return;
}
}
/* Drop back to detecting it the long way. */
fp = fopen("/proc/filesystems", "r");
if (!fp)
return;
__fsetlocking(fp, FSETLOCKING_BYCALLER);
while ((num = getline(&buf, &len, fp)) != -1) {
if (strstr(buf, "selinuxfs")) {
exists = 1;
break;
}
}
fclose(fp);
if (!exists)
return;
/* At this point, the usual spot doesn't have an selinuxfs so
* we look around for it */
fp = fopen("/proc/mounts", "r");
if (!fp)
return;
__fsetlocking(fp, FSETLOCKING_BYCALLER);
while ((num = getline(&buf, &len, fp)) != -1) {
char *tmp;
p = strchr(buf, ' ');
if (!p)
goto out;
p++;
tmp = strchr(p, ' ');
if (!tmp)
goto out;
if (!strncmp(tmp + 1, "selinuxfs ", 10)) {
*tmp = '\0';
break;
}
}
/* If we found something, dup it */
if (num > 0)
selinux_mnt = strdup(p);
out:
free(buf);
fclose(fp);
return;
}
static void fini_selinuxmnt(void)
{
free(selinux_mnt);
selinux_mnt = NULL;
}
void set_selinuxmnt(char *mnt)
{
selinux_mnt = strdup(mnt);
}
hidden_def(set_selinuxmnt)
static void init_lib(void) __attribute__ ((constructor));
static void init_lib(void)
{
selinux_page_size = sysconf(_SC_PAGE_SIZE);
init_selinuxmnt();
}
static void fini_lib(void) __attribute__ ((destructor));
static void fini_lib(void)
{
fini_selinuxmnt();
}
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