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
8
* Copyright (C) 2002-2010 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
31
#include "ping-inline.h"
34
* This random string identifies an OpenVPN ping packet.
35
* It should be of sufficient length and randomness
36
* so as not to collide with other tunnel data.
38
* PING_STRING_SIZE must be sizeof (ping_string)
40
const uint8_t ping_string[] = {
41
0x2a, 0x18, 0x7b, 0xf3, 0x64, 0x1e, 0xb4, 0xcb,
42
0x07, 0xed, 0x2d, 0x0a, 0x98, 0x1f, 0xc7, 0x48
46
* Should we exit or restart due to ping (or other authenticated packet)
47
* not received in n seconds?
50
check_ping_restart_dowork (struct context *c)
52
struct gc_arena gc = gc_new ();
53
switch (c->options.ping_rec_timeout_action)
56
msg (M_INFO, "%sInactivity timeout (--ping-exit), exiting",
57
format_common_name (c, &gc));
58
c->sig->signal_received = SIGTERM;
59
c->sig->signal_text = "ping-exit";
62
msg (M_INFO, "%sInactivity timeout (--ping-restart), restarting",
63
format_common_name (c, &gc));
64
c->sig->signal_received = SIGUSR1; /* SOFT-SIGUSR1 -- Ping Restart */
65
c->sig->signal_text = "ping-restart";
74
* Should we ping the remote?
77
check_ping_send_dowork (struct context *c)
79
c->c2.buf = c->c2.buffers->aux_buf;
80
ASSERT (buf_init (&c->c2.buf, FRAME_HEADROOM (&c->c2.frame)));
81
ASSERT (buf_safe (&c->c2.buf, MAX_RW_SIZE_TUN (&c->c2.frame)));
82
ASSERT (buf_write (&c->c2.buf, ping_string, sizeof (ping_string)));
85
* We will treat the ping like any other outgoing packet,
88
encrypt_sign (c, true);
89
dmsg (D_PING, "SENT PING");