-/*
- device.c -- Interaction with MacOS/X tun device
- Copyright (C) 2001-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
- 2001-2004 Guus Sliepen <guus@tinc-vpn.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.
-
- $Id$
-*/
-
-#include "system.h"
-
-#include "conf.h"
-#include "logger.h"
-#include "net.h"
-#include "route.h"
-#include "utils.h"
-
-#define DEFAULT_DEVICE "/dev/tun0"
-
-typedef enum device_type {
- DEVICE_TYPE_TUN,
- DEVICE_TYPE_TAP,
-} device_type_t;
-
-int device_fd = -1;
-char *device;
-char *iface;
-char *device_info;
-static int device_total_in = 0;
-static int device_total_out = 0;
-static device_type_t device_type = DEVICE_TYPE_TUN;
-
-bool setup_device(void)
-{
- char *type;
-
- cp();
-
- if(!get_config_string(lookup_config(config_tree, "Device"), &device))
- device = DEFAULT_DEVICE;
-
- if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
- iface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
-
- if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
- logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
- return false;
- }
-
- if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
- if(!strcasecmp(type, "tun"))
- device_type = DEVICE_TYPE_TUN;
- else if(!strcasecmp(type, "tap"))
- device_type = DEVICE_TYPE_TAP;
- else {
- logger(LOG_ERR, _("Unknown device type %s!"), type);
- return false;
- }
- } else {
- if(strstr(device, "tap"))
- device_type = DEVICE_TYPE_TAP;
- }
-
- switch(device_type) {
- default:
- device_type = DEVICE_TYPE_TUN;
- case DEVICE_TYPE_TUN:
- device_info = _("MacOS/X tun device");
- break;
- case DEVICE_TYPE_TAP:
- if(routing_mode == RMODE_ROUTER)
- overwrite_mac = true;
- device_info = _("MacOS/X tap device");
- break;
- }
-
- logger(LOG_INFO, _("%s is a %s"), device, device_info);
-
- return true;
-}
-
-void close_device(void)
-{
- cp();
-
- close(device_fd);
-}
-
-bool read_packet(vpn_packet_t *packet)
-{
- int lenin;
-
- cp();
-
- switch(device_type) {
- case DEVICE_TYPE_TUN:
- if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
- logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
- device, strerror(errno));
- return false;
- }
-
- switch(packet->data[14] >> 4) {
- case 4:
- packet->data[12] = 0x08;
- packet->data[13] = 0x00;
- break;
- case 6:
- packet->data[12] = 0x86;
- packet->data[13] = 0xDD;
- break;
- default:
- ifdebug(TRAFFIC) logger(LOG_ERR,
- _ ("Unknown IP type %d while reading packet from %s %s"),
- packet->data[14] >> 4, device_info, device);
- return false;
- }
-
- packet->len = lenin + 14;
- break;
- case DEVICE_TYPE_TAP:
- if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
- logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
- device, strerror(errno));
- return false;
- }
-
- packet->len = lenin;
- break;
- default:
- return false;
- }
-
- device_total_in += packet->len;
-
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"),
- packet->len, device_info);
-
- return true;
-}
-
-bool write_packet(vpn_packet_t *packet)
-{
- cp();
-
- ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
- packet->len, device_info);
-
- switch(device_type) {
- case DEVICE_TYPE_TUN:
- if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
- logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
- device, strerror(errno));
- return false;
- }
- break;
- case DEVICE_TYPE_TAP:
- if(write(device_fd, packet->data, packet->len) < 0) {
- logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
- device, strerror(errno));
- return false;
- }
- break;
- default:
- return false;
- }
-
- device_total_out += packet->len;
-
- return true;
-}
-
-void dump_device_stats(void)
-{
- cp();
-
- logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
- logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
- logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
-}
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