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-rwxr-xr-xsrc/util.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/src/util.c b/src/util.c
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--- /dev/null
+++ b/src/util.c
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+/*
+ *
+ * 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;
+}