/* *  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) 2002-2004 James Yonan <jim@yonan.net> * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  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 boolsession_id_equal (const struct session_id *sid1,		  const struct session_id *sid2){  return !memcmp (sid1->id, sid2->id, SID_SIZE);}static inline boolsession_id_defined (const struct session_id *sid1){  return memcmp (sid1->id, &x_session_id_zero.id, SID_SIZE) != 0;}static inline boolsession_id_read (struct session_id *sid, struct buffer *buf){  return buf_read (buf, sid->id, SID_SIZE);}static inline boolsession_id_write_prepend (const struct session_id *sid, struct buffer *buf){  return buf_write_prepend (buf, sid->id, SID_SIZE);}static inline boolsession_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 */