1/* 2 * OpenVPN -- An application to securely tunnel IP networks 3 * over a single TCP/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#ifndef PING_H 26#define PING_H 27 28#include "init.h" 29#include "forward.h" 30 31/* 32 * Initial default --ping-restart before --pull 33 */ 34#define PRE_PULL_INITIAL_PING_RESTART 120 /* in seconds */ 35 36extern const uint8_t ping_string[]; 37 38/* PING_STRING_SIZE must be sizeof (ping_string) */ 39#define PING_STRING_SIZE 16 40 41static inline bool 42is_ping_msg (const struct buffer* buf) 43{ 44 return buf_string_match (buf, ping_string, PING_STRING_SIZE); 45} 46 47#endif 48