/*
device.c -- Interaction with Linux ethertap and tun/tap device
- Copyright (C) 2001 Ivo Timmermans <itimmermans@bigfoot.com>,
- 2001 Guus Sliepen <guus@sliepen.warande.net>
+ 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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: device.c,v 1.1.2.1 2001/10/12 15:16:03 guus Exp $
+ $Id: device.c,v 1.1.2.5 2002/02/10 21:57:54 guus Exp $
*/
+#include "config.h"
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <net/if.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
#ifdef HAVE_TUNTAP
#ifdef LINUX_IF_TUN_H
#include LINUX_IF_TUN_H
#define DEFAULT_DEVICE "/dev/tap0"
#endif
+#include <utils.h>
+#include "conf.h"
+#include "net.h"
+#include "subnet.h"
+
+#include "system.h"
+
#define DEVICE_TYPE_ETHERTAP 0
#define DEVICE_TYPE_TUNTAP 1
int device_fd = -1;
int device_type;
-char *device_fname;
+char *device;
+char *interface;
+char ifrname[IFNAMSIZ];
char *device_info;
int device_total_in = 0;
int device_total_out = 0;
+extern subnet_t mymac;
+
/*
open the local ethertap device
*/
struct ifreq ifr;
cp
- if(!get_config_string(lookup_config(config_tree, "Device"), &device_fname)))
- device_fname = DEFAULT_DEVICE;
+ 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_fname, O_RDWR | O_NONBLOCK)) < 0)
+ if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
{
- syslog(LOG_ERR, _("Could not open %s: %m"), device_fname);
+ syslog(LOG_ERR, _("Could not open %s: %m"), device);
return -1;
}
cp
- device_fd = device_fd;
-
/* Set default MAC address for ethertap devices */
mymac.type = SUBNET_MAC;
memset(&ifr, 0, sizeof(ifr));
cp
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
- if (netname)
- strncpy(ifr.ifr_name, netname, IFNAMSIZ);
+ if (interface)
+ strncpy(ifr.ifr_name, interface, IFNAMSIZ);
cp
if (!ioctl(device_fd, TUNSETIFF, (void *) &ifr))
{
- device_info = _("Linux tun/tap device");
+ device_info = _("Linux tun/tap device");
device_type = DEVICE_TYPE_TUNTAP;
+ strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
+ interface = ifrname;
}
else
if (!ioctl(device_fd, (('T'<< 8) | 202), (void *) &ifr))
{
- syslog(LOG_WARNING, _("Old ioctl() request was needed for %s"), device_fname);
- device_type = TAP_TYPE_TUNTAP;
+ syslog(LOG_WARNING, _("Old ioctl() request was needed for %s"), device);
+ device_type = DEVICE_TYPE_TUNTAP;
device_info = _("Linux tun/tap device");
+ strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
+ interface = ifrname;
}
else
#endif
{
device_info = _("Linux ethertap device");
- device_type = TAP_TYPE_ETHERTAP;
+ device_type = DEVICE_TYPE_ETHERTAP;
}
- syslog(LOG_INFO, _("%s is a %s"), device_fname, device_info);
+ 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
{
if((lenin = read(device_fd, packet->data, MTU)) <= 0)
{
- syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device_fname);
+ syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device);
return -1;
}
}
else /* ethertap */
{
- struct iovec vector[2] = {{packet->len, 2}, {packet->data, MTU}};
-
- if((lenin = readv(device_fd, vector, 2)) <= 0)
+ if((lenin = read(device_fd, packet->data - 2, MTU + 2)) <= 0)
{
- syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device_fname);
+ syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device);
return -1;
}
packet->len = lenin - 2;
}
-#endif
device_total_in += packet->len;
if(debug_lvl >= DEBUG_TRAFFIC)
{
- syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), device_info, packet.len);
+ syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len, device_info);
}
return 0;
{
if(write(device_fd, packet->data, packet->len) < 0)
{
- syslog(LOG_ERR, _("Can't write to %s %s: %m"), device_info, packet.len);
+ syslog(LOG_ERR, _("Can't write to %s %s: %m"), device_info, device);
return -1;
}
}
else/* ethertap */
{
- struct iovec vector[2] = {{packet->len, 2}, {packet->data, MTU}};
-
- if(writev(device_fd, vector, 2) < 0)
+ *(short int *)(packet->data - 2) = packet->len;
+ if(write(device_fd, packet->data - 2, packet->len + 2) < 0)
{
- syslog(LOG_ERR, _("Can't write to %s %s: %m"), device_info, packet.len);
+ syslog(LOG_ERR, _("Can't write to %s %s: %m"), device_info, device);
return -1;
}
}
device_total_out += packet->len;
+cp
+ return 0;
+}
+
+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
}