tinc/src/darwin/device.c

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/*
device.c -- Interaction with MacOS/X tun device
Copyright (C) 2001-2002 Ivo Timmermans <ivo@o2w.nl>,
2001-2002 Guus Sliepen <guus@sliepen.eu.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: device.c,v 1.1.2.2 2002/06/21 10:11:34 guus Exp $
*/
#include "config.h"
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <net/if.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>
#include <utils.h>
#include "conf.h"
#include "net.h"
#include "subnet.h"
#include "system.h"
#define DEFAULT_DEVICE "/dev/tun0"
int device_fd = -1;
int device_type;
char *device;
char *interface;
char *device_info;
int device_total_in = 0;
int device_total_out = 0;
extern subnet_t mymac;
/*
open the local ethertap device
*/
int setup_device(void)
{
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if(!get_config_string(lookup_config(config_tree, "Device"), &device))
device = DEFAULT_DEVICE;
if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
interface = rindex(device, '/')?rindex(device, '/')+1:device;
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if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
{
syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
return -1;
}
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/* Set default MAC address for ethertap devices */
mymac.type = SUBNET_MAC;
mymac.net.mac.address.x[0] = 0xfe;
mymac.net.mac.address.x[1] = 0xfd;
mymac.net.mac.address.x[2] = 0x00;
mymac.net.mac.address.x[3] = 0x00;
mymac.net.mac.address.x[4] = 0x00;
mymac.net.mac.address.x[5] = 0x00;
device_info = _("MacOS/X tun device");
syslog(LOG_INFO, _("%s is a %s"), device, device_info);
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return 0;
}
void close_device(void)
{
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close(device_fd);
}
/*
read, encrypt and send data that is
available through the ethertap device
*/
int read_packet(vpn_packet_t *packet)
{
int lenin;
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if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0)
{
syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, device, strerror(errno));
return -1;
}
memcpy(packet->data, mymac.net.mac.address.x, 6);
memcpy(packet->data + 6, mymac.net.mac.address.x, 6);
packet->data[12] = 0x08;
packet->data[13] = 0x00;
packet->len = lenin + 14;
device_total_in += packet->len;
if(debug_lvl >= DEBUG_TRAFFIC)
syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"),
packet->len, device_info);
return 0;
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}
int write_packet(vpn_packet_t *packet)
{
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if(debug_lvl >= DEBUG_TRAFFIC)
syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
packet->len, device_info);
if(write(device_fd, packet->data + 14, packet->len - 14) < 0)
{
syslog(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, strerror(errno));
return -1;
}
device_total_out += packet->len;
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}
void dump_device_stats(void)
{
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syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
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}