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- /*
- device.c -- Interaction with FreeBSD tap device
- Copyright (C) 2001-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2001-2002 Guus Sliepen <guus@sliepen.warande.net>
- 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 2002/02/10 21:57:54 guus Exp $
- */
- #include "config.h"
- #include <stdio.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/tap0"
- 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)
- {
- cp
- if(!get_config_string(lookup_config(config_tree, "Device"), &device))
- device = DEFAULT_DEVICE;
- if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
- interface = netname;
- cp
- if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
- {
- syslog(LOG_ERR, _("Could not open %s: %m"), device);
- return -1;
- }
- cp
- /* 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 = _("FreeBSD tap device");
- syslog(LOG_INFO, _("%s is a %s"), device, device_info);
- cp
- return 0;
- }
- void close_device(void)
- {
- cp
- close(device_fd);
- }
- /*
- read, encrypt and send data that is
- available through the ethertap device
- */
- int read_packet(vpn_packet_t *packet)
- {
- int lenin;
- cp
- if((lenin = read(device_fd, packet->data, MTU)) <= 0)
- {
- syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device);
- return -1;
- }
- packet->len = lenin;
- 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;
- cp
- }
- int write_packet(vpn_packet_t *packet)
- {
- cp
- 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, packet->len) < 0)
- {
- syslog(LOG_ERR, _("Error while writing to %s %s: %m"), device_info, device);
- return -1;
- }
- device_total_out += packet->len;
- cp
- }
- void dump_device_stats(void)
- {
- cp
- 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);
- cp
- }
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