/*
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>
+ 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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: device.c,v 1.1.2.7 2003/07/06 22:11:33 guus Exp $
+ $Id$
*/
-#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 <string.h>
+#include "system.h"
-#include <utils.h>
#include "conf.h"
-#include "net.h"
#include "logger.h"
-
-#include "system.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;
-int device_type;
char *device;
-char *interface;
+char *iface;
char *device_info;
-int device_total_in = 0;
-int device_total_out = 0;
+static int device_total_in = 0;
+static int device_total_out = 0;
+static device_type_t device_type = DEVICE_TYPE_TUN;
-/*
- open the local ethertap device
-*/
-int setup_device(void)
+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"), &interface))
- interface = rindex(device, '/') ? rindex(device, '/') + 1 : 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(DEBUG_ALWAYS, LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
- return -1;
+ logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
+ return false;
}
- device_info = _("MacOS/X tun device");
+ 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(DEBUG_ALWAYS, LOG_INFO, _("%s is a %s"), device, device_info);
+ logger(LOG_INFO, _("%s is a %s"), device, device_info);
- return 0;
+ return true;
}
void close_device(void)
close(device_fd);
}
-/*
- read, encrypt and send data that is
- available through the ethertap device
-*/
-int read_packet(vpn_packet_t *packet)
+bool read_packet(vpn_packet_t *packet)
{
int lenin;
cp();
- if((lenin = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
- device, strerror(errno));
- return -1;
+ 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;
}
-
- packet->data[12] = 0x08;
- packet->data[13] = 0x00;
-
- packet->len = lenin + 14;
-
+
device_total_in += packet->len;
- logger(DEBUG_TRAFFIC, LOG_DEBUG, _("Read packet of %d bytes from %s"),
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"),
packet->len, device_info);
- return 0;
+ return true;
}
-int write_packet(vpn_packet_t *packet)
+bool write_packet(vpn_packet_t *packet)
{
cp();
- logger(DEBUG_TRAFFIC, LOG_DEBUG, _("Writing packet of %d bytes to %s"),
+ ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
packet->len, device_info);
- if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
- device, strerror(errno));
- return -1;
+ 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(DEBUG_ALWAYS, LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
- logger(DEBUG_ALWAYS, LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
- logger(DEBUG_ALWAYS, LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
+ 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);
}
projects / tinc / blobdiff