1 files changed, 86 insertions, 0 deletions
diff --git a/openvpn/session_id.h b/openvpn/session_id.h
new file mode 100644
index 0000000..d569c09
--- /dev/null
+++ b/openvpn/session_id.h
@@ -0,0 +1,86 @@
+/*
+ *  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) 2002-2005 OpenVPN Solutions LLC <info@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).
+ */
+
+#if defined(USE_CRYPTO) && defined(USE_SSL)
+
+#ifndef SESSION_ID_H
+#define SESSION_ID_H
+
+#include "basic.h"
+#include "buffer.h"
+
+struct session_id
+{
+  uint8_t id[8];
+};
+
+extern const struct session_id x_session_id_zero;
+
+#define SID_SIZE (sizeof (x_session_id_zero.id))
+
+static inline bool
+session_id_equal (const struct session_id *sid1,
+		  const struct session_id *sid2)
+{
+  return !memcmp (sid1->id, sid2->id, SID_SIZE);
+}
+
+static inline bool
+session_id_defined (const struct session_id *sid1)
+{
+  return memcmp (sid1->id, &x_session_id_zero.id, SID_SIZE) != 0;
+}
+
+static inline bool
+session_id_read (struct session_id *sid, struct buffer *buf)
+{
+  return buf_read (buf, sid->id, SID_SIZE);
+}
+
+static inline bool
+session_id_write_prepend (const struct session_id *sid, struct buffer *buf)
+{
+  return buf_write_prepend (buf, sid->id, SID_SIZE);
+}
+
+static inline bool
+session_id_write (const struct session_id *sid, struct buffer *buf)
+{
+  return buf_write (buf, sid->id, SID_SIZE);
+}
+
+void session_id_random (struct session_id *sid);
+
+const char *session_id_print (const struct session_id *sid, struct gc_arena *gc);
+
+#endif /* SESSION_ID_H */
+#endif /* USE_CRYPTO && USE_SSL */