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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2021 OpenVPN Inc <sales@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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef PING_H
#define PING_H
#include "init.h"
#include "forward.h"
/*
* Initial default --ping-restart before --pull
*/
#define PRE_PULL_INITIAL_PING_RESTART 120 /* in seconds */
extern const uint8_t ping_string[];
/* PING_STRING_SIZE must be sizeof (ping_string) */
#define PING_STRING_SIZE 16
static inline bool
is_ping_msg(const struct buffer *buf)
{
return buf_string_match(buf, ping_string, PING_STRING_SIZE);
}
/**
* Trigger the correct signal on a --ping timeout
* depending if --ping-exit is set (SIGTERM) or not
* (SIGUSR1)
*/
void trigger_ping_timeout_signal(struct context *c);
void check_ping_send_dowork(struct context *c);
/*
* Should we exit or restart due to ping (or other authenticated packet)
* not received in n seconds?
*/
static inline void
check_ping_restart(struct context *c)
{
if (c->options.ping_rec_timeout
&& event_timeout_trigger(&c->c2.ping_rec_interval,
&c->c2.timeval,
(!c->options.ping_timer_remote
|| link_socket_actual_defined(&c->c1.link_socket_addr.actual))
? ETT_DEFAULT : 15))
{
trigger_ping_timeout_signal(c);
}
}
/*
* Should we ping the remote?
*/
static inline void
check_ping_send(struct context *c)
{
if (c->options.ping_send_timeout
&& event_timeout_trigger(&c->c2.ping_send_interval,
&c->c2.timeval,
!TO_LINK_DEF(c) ? ETT_DEFAULT : 1))
{
check_ping_send_dowork(c);
}
}
#endif /* ifndef PING_H */
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