mirror of
https://github.com/OpenVPN/openvpn.git
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c67d59cd5c
* Added code to make sure that the local PATH environmental variable points to the Windows system32 directory. * Added new --ip-win32 adaptive mode which tries 'dynamic' and then fails over to 'netsh' if the DHCP negotiation fails. * Made --ip-win32 adaptive the default. git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@739 e7ae566f-a301-0410-adde-c780ea21d3b5
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* OpenVPN -- An application to securely tunnel IP networks
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* over a single TCP/UDP port, with support for SSL/TLS-based
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* session authentication and key exchange,
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* packet encryption, packet authentication, and
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* packet compression.
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*
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* Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see the file COPYING included with this
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* distribution); if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef WIN32
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#include "config-win32.h"
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#else
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#include "config.h"
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#endif
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#include "syshead.h"
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#include "ping.h"
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#include "memdbg.h"
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#include "ping-inline.h"
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/*
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* This random string identifies an OpenVPN ping packet.
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* It should be of sufficient length and randomness
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* so as not to collide with other tunnel data.
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*
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* PING_STRING_SIZE must be sizeof (ping_string)
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*/
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const uint8_t ping_string[] = {
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0x2a, 0x18, 0x7b, 0xf3, 0x64, 0x1e, 0xb4, 0xcb,
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0x07, 0xed, 0x2d, 0x0a, 0x98, 0x1f, 0xc7, 0x48
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};
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/*
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* Should we exit or restart due to ping (or other authenticated packet)
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* not received in n seconds?
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*/
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void
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check_ping_restart_dowork (struct context *c)
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{
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struct gc_arena gc = gc_new ();
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switch (c->options.ping_rec_timeout_action)
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{
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case PING_EXIT:
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msg (M_INFO, "%sInactivity timeout (--ping-exit), exiting",
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format_common_name (c, &gc));
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c->sig->signal_received = SIGTERM;
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c->sig->signal_text = "ping-exit";
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break;
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case PING_RESTART:
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msg (M_INFO, "%sInactivity timeout (--ping-restart), restarting",
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format_common_name (c, &gc));
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c->sig->signal_received = SIGUSR1; /* SOFT-SIGUSR1 -- Ping Restart */
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c->sig->signal_text = "ping-restart";
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break;
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default:
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ASSERT (0);
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}
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gc_free (&gc);
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}
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/*
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* Should we ping the remote?
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*/
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void
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check_ping_send_dowork (struct context *c)
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{
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c->c2.buf = c->c2.buffers->aux_buf;
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ASSERT (buf_init (&c->c2.buf, FRAME_HEADROOM (&c->c2.frame)));
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ASSERT (buf_safe (&c->c2.buf, MAX_RW_SIZE_TUN (&c->c2.frame)));
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ASSERT (buf_write (&c->c2.buf, ping_string, sizeof (ping_string)));
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/*
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* We will treat the ping like any other outgoing packet,
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* encrypt, sign, etc.
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*/
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encrypt_sign (c, true);
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dmsg (D_PING, "SENT PING");
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}
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