mirror of
https://github.com/OpenVPN/openvpn.git
synced 2024-09-20 12:02:28 +02:00
1bda73a7b0
git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@2959 e7ae566f-a301-0410-adde-c780ea21d3b5
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
|
|
* 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) 2002-2005 OpenVPN Solutions LLC <info@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 (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
|
|
*/
|
|
|
|
#include "syshead.h"
|
|
|
|
#include "ping.h"
|
|
|
|
#include "memdbg.h"
|
|
|
|
#include "ping-inline.h"
|
|
|
|
/*
|
|
* This random string identifies an OpenVPN ping packet.
|
|
* It should be of sufficient length and randomness
|
|
* so as not to collide with other tunnel data.
|
|
*
|
|
* PING_STRING_SIZE must be sizeof (ping_string)
|
|
*/
|
|
const uint8_t ping_string[] = {
|
|
0x2a, 0x18, 0x7b, 0xf3, 0x64, 0x1e, 0xb4, 0xcb,
|
|
0x07, 0xed, 0x2d, 0x0a, 0x98, 0x1f, 0xc7, 0x48
|
|
};
|
|
|
|
/*
|
|
* Should we exit or restart due to ping (or other authenticated packet)
|
|
* not received in n seconds?
|
|
*/
|
|
void
|
|
check_ping_restart_dowork (struct context *c)
|
|
{
|
|
struct gc_arena gc = gc_new ();
|
|
switch (c->options.ping_rec_timeout_action)
|
|
{
|
|
case PING_EXIT:
|
|
msg (M_INFO, "%sInactivity timeout (--ping-exit), exiting",
|
|
format_common_name (c, &gc));
|
|
c->sig->signal_received = SIGTERM;
|
|
c->sig->signal_text = "ping-exit";
|
|
break;
|
|
case PING_RESTART:
|
|
msg (M_INFO, "%sInactivity timeout (--ping-restart), restarting",
|
|
format_common_name (c, &gc));
|
|
c->sig->signal_received = SIGUSR1; /* SOFT-SIGUSR1 -- Ping Restart */
|
|
c->sig->signal_text = "ping-restart";
|
|
break;
|
|
default:
|
|
ASSERT (0);
|
|
}
|
|
gc_free (&gc);
|
|
}
|
|
|
|
/*
|
|
* Should we ping the remote?
|
|
*/
|
|
void
|
|
check_ping_send_dowork (struct context *c)
|
|
{
|
|
c->c2.buf = c->c2.buffers->aux_buf;
|
|
ASSERT (buf_init (&c->c2.buf, FRAME_HEADROOM (&c->c2.frame)));
|
|
ASSERT (buf_safe (&c->c2.buf, MAX_RW_SIZE_TUN (&c->c2.frame)));
|
|
ASSERT (buf_write (&c->c2.buf, ping_string, sizeof (ping_string)));
|
|
|
|
/*
|
|
* We will treat the ping like any other outgoing packet,
|
|
* encrypt, sign, etc.
|
|
*/
|
|
encrypt_sign (c, true);
|
|
dmsg (D_PING, "SENT PING");
|
|
}
|