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
8 * Copyright (C) 2002-2009 OpenVPN Technologies, Inc. <sales@openvpn.net>
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.
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.
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
26 * Each session is identified by a random 8-byte session identifier.
28 * For efficiency, the session id is only transmitted over the control
29 * channel (which only sees traffic occasionally when keys are being
33 #if defined(USE_CRYPTO) && defined(USE_SSL)
46 extern const struct session_id x_session_id_zero
;
48 #define SID_SIZE (sizeof (x_session_id_zero.id))
51 session_id_equal (const struct session_id
*sid1
,
52 const struct session_id
*sid2
)
54 return !memcmp (sid1
->id
, sid2
->id
, SID_SIZE
);
58 session_id_defined (const struct session_id
*sid1
)
60 return memcmp (sid1
->id
, &x_session_id_zero
.id
, SID_SIZE
) != 0;
64 session_id_read (struct session_id
*sid
, struct buffer
*buf
)
66 return buf_read (buf
, sid
->id
, SID_SIZE
);
70 session_id_write_prepend (const struct session_id
*sid
, struct buffer
*buf
)
72 return buf_write_prepend (buf
, sid
->id
, SID_SIZE
);
76 session_id_write (const struct session_id
*sid
, struct buffer
*buf
)
78 return buf_write (buf
, sid
->id
, SID_SIZE
);
81 void session_id_random (struct session_id
*sid
);
83 const char *session_id_print (const struct session_id
*sid
, struct gc_arena
*gc
);
85 #endif /* SESSION_ID_H */
86 #endif /* USE_CRYPTO && USE_SSL */