154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
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/*
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device.c -- Interaction with MacOS/X tun device
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Copyright (C) 2001-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
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2001-2002 Guus Sliepen <guus@sliepen.warande.net>
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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 as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: device.c,v 1.1.2.1 2002/06/10 14:33:40 guus Exp $
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*/
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#include "config.h"
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <net/if.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <string.h>
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#include <utils.h>
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#include "conf.h"
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#include "net.h"
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#include "subnet.h"
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#include "system.h"
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#define DEFAULT_DEVICE "/dev/tun0"
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int device_fd = -1;
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int device_type;
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char *device;
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char *interface;
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char *device_info;
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int device_total_in = 0;
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int device_total_out = 0;
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extern subnet_t mymac;
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/*
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open the local ethertap device
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*/
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int setup_device(void)
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{
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cp
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if(!get_config_string(lookup_config(config_tree, "Device"), &device))
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device = DEFAULT_DEVICE;
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if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
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interface = rindex(device, '/')?rindex(device, '/')+1:device;
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cp
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if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
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{
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syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
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return -1;
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}
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cp
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/* Set default MAC address for ethertap devices */
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mymac.type = SUBNET_MAC;
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mymac.net.mac.address.x[0] = 0xfe;
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mymac.net.mac.address.x[1] = 0xfd;
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mymac.net.mac.address.x[2] = 0x00;
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mymac.net.mac.address.x[3] = 0x00;
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mymac.net.mac.address.x[4] = 0x00;
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mymac.net.mac.address.x[5] = 0x00;
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device_info = _("MacOS/X tun device");
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syslog(LOG_INFO, _("%s is a %s"), device, device_info);
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cp
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return 0;
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}
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void close_device(void)
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{
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cp
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close(device_fd);
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}
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/*
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read, encrypt and send data that is
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available through the ethertap device
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*/
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int read_packet(vpn_packet_t *packet)
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{
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int lenin;
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cp
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if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0)
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{
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syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info, device, strerror(errno));
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return -1;
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}
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memcpy(packet->data, mymac.net.mac.address.x, 6);
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memcpy(packet->data + 6, mymac.net.mac.address.x, 6);
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packet->data[12] = 0x08;
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packet->data[13] = 0x00;
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packet->len = lenin + 14;
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device_total_in += packet->len;
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"),
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packet->len, device_info);
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return 0;
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cp
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}
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int write_packet(vpn_packet_t *packet)
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{
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cp
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if(debug_lvl >= DEBUG_TRAFFIC)
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syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
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packet->len, device_info);
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if(write(device_fd, packet->data + 14, packet->len - 14) < 0)
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{
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syslog(LOG_ERR, _("Error while writing to %s %s: %s"), device_info, device, strerror(errno));
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return -1;
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}
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device_total_out += packet->len;
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cp
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}
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void dump_device_stats(void)
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{
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cp
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syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
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syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
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syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
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cp
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}
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