1 files changed, 88 insertions, 0 deletions
diff --git a/src/util.c b/src/util.c
new file mode 100755
index 00000000..da32cc55
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,88 @@
+/*
+ *
+ *  Connection Manager
+ *
+ *  Copyright (C) 2014  Intel Corporation. All rights reserved.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include "connman.h"
+
+#define URANDOM "/dev/urandom"
+
+int f = -1;
+
+int __connman_util_get_random(uint64_t *val)
+{
+	int r = 0;
+
+	if (!val)
+		return -EINVAL;
+
+	if (read(f, val, sizeof(uint64_t)) < 0) {
+		r = -errno;
+		connman_warn_once("Could not read from "URANDOM);
+		*val = random();
+	}
+
+	return r;
+}
+
+int __connman_util_init(void)
+{
+	int r = 0;
+
+	if (f > 0)
+		return 0;
+
+	f = open(URANDOM, O_RDONLY);
+	if (f < 0) {
+		r = -errno;
+		connman_warn("Could not open "URANDOM);
+		srandom(time(NULL));
+	} else {
+		uint64_t val;
+
+		r = __connman_util_get_random(&val);
+		if (r < 0)
+			srandom(time(NULL));
+		else
+			srandom(val);
+	}
+
+	return r;
+}
+
+void __connman_util_cleanup(void)
+{
+	if (f > 0)
+		close(f);
+
+	f = -1;
+}