1 files changed, 128 insertions, 0 deletions
diff --git a/libselinux/src/init.c b/libselinux/src/init.c
new file mode 100644
index 00000000..9cdbb06e
--- /dev/null
+++ b/libselinux/src/init.c
@@ -0,0 +1,128 @@
+#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;
+
+	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;
+		}
+	} 
+
+	/* 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_obj_class_compat(void)
+{
+	char path[PATH_MAX];
+	struct stat s;
+
+	if (!selinux_mnt)
+		return;
+
+	snprintf(path,PATH_MAX,"%s/class",selinux_mnt);
+	if (stat(path,&s) < 0)
+		return;
+
+	if (S_ISDIR(s.st_mode))
+		obj_class_compat = 0;
+}
+
+static void fini_obj_class_compat(void)
+{
+	obj_class_compat = 1;
+}
+
+static void init_lib(void) __attribute__ ((constructor));
+static void init_lib(void)
+{
+	selinux_page_size = sysconf(_SC_PAGE_SIZE);
+	init_selinuxmnt();
+	init_obj_class_compat();
+	init_context_translations();
+}
+
+static void fini_lib(void) __attribute__ ((destructor));
+static void fini_lib(void)
+{
+	fini_selinuxmnt();
+	fini_obj_class_compat();
+	fini_context_translations();
+}