1/* 2 * OpenVPN -- An application to securely tunnel IP networks 3 * over a single UDP port, with support for SSL/TLS-based 4 * session authentication and key exchange, 5 * packet encryption, packet authentication, and 6 * packet compression. 7 * 8 * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 12 * as published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program (see the file COPYING included with this 21 * distribution); if not, write to the Free Software Foundation, Inc., 22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 */ 24 25/* 26 * Each session is identified by a random 8-byte session identifier. 27 * 28 * For efficiency, the session id is only transmitted over the control 29 * channel (which only sees traffic occasionally when keys are being 30 * negotiated). 31 */ 32 33#if defined(ENABLE_CRYPTO) && defined(ENABLE_SSL) 34 35#ifndef SESSION_ID_H 36#define SESSION_ID_H 37 38#include "basic.h" 39#include "buffer.h" 40 41struct session_id 42{ 43 uint8_t id[8]; 44}; 45 46extern const struct session_id x_session_id_zero; 47 48#define SID_SIZE (sizeof (x_session_id_zero.id)) 49 50static inline bool 51session_id_equal (const struct session_id *sid1, 52 const struct session_id *sid2) 53{ 54 return !memcmp (sid1->id, sid2->id, SID_SIZE); 55} 56 57static inline bool 58session_id_defined (const struct session_id *sid1) 59{ 60 return memcmp (sid1->id, &x_session_id_zero.id, SID_SIZE) != 0; 61} 62 63static inline bool 64session_id_read (struct session_id *sid, struct buffer *buf) 65{ 66 return buf_read (buf, sid->id, SID_SIZE); 67} 68 69static inline bool 70session_id_write_prepend (const struct session_id *sid, struct buffer *buf) 71{ 72 return buf_write_prepend (buf, sid->id, SID_SIZE); 73} 74 75static inline bool 76session_id_write (const struct session_id *sid, struct buffer *buf) 77{ 78 return buf_write (buf, sid->id, SID_SIZE); 79} 80 81void session_id_random (struct session_id *sid); 82 83const char *session_id_print (const struct session_id *sid, struct gc_arena *gc); 84 85#endif /* SESSION_ID_H */ 86#endif /* ENABLE_CRYPTO && ENABLE_SSL */ 87