1 files changed, 67 insertions, 0 deletions
diff --git a/src/openvpn/session_id.c b/src/openvpn/session_id.c
new file mode 100644
index 0000000..2e07b54
--- /dev/null
+++ b/src/openvpn/session_id.c
@@ -0,0 +1,67 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ *  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 (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+ * Each session is identified by a random 8-byte session identifier.
+ *
+ * For efficiency, the session id is only transmitted over the control
+ * channel (which only sees traffic occasionally when keys are being
+ * negotiated).  The data channel sees a smaller version of the session-id --
+ * it is called the key_id and is currently 2 bits long.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#include "syshead.h"
+
+#if defined(ENABLE_CRYPTO) && defined(ENABLE_SSL)
+
+#include "error.h"
+#include "common.h"
+#include "crypto.h"
+#include "session_id.h"
+
+#include "memdbg.h"
+
+const struct session_id x_session_id_zero;
+
+void
+session_id_random (struct session_id *sid)
+{
+  prng_bytes (sid->id, SID_SIZE);
+}
+
+const char *
+session_id_print (const struct session_id *sid, struct gc_arena *gc)
+{
+  return format_hex (sid->id, SID_SIZE, 0, gc);
+}
+
+#else
+static void dummy(void) {}
+#endif /* ENABLE_CRYPTO && ENABLE_SSL*/