/*
device.c -- Interaction with Linux ethertap and tun/tap device
- Copyright (C) 2001-2003 Ivo Timmermans <ivo@o2w.nl>,
- 2001-2003 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 2001-2005 Ivo Timmermans,
+ 2001-2009 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 1.1.2.19 2003/07/18 13:41:36 guus Exp $
+ $Id$
*/
#include "system.h"
-#ifdef HAVE_TUNTAP
-#ifdef LINUX_IF_TUN_H
-#include LINUX_IF_TUN_H
-#else
+#ifdef HAVE_LINUX_IF_TUN_H
#include <linux/if_tun.h>
-#endif
#define DEFAULT_DEVICE "/dev/net/tun"
#else
#define DEFAULT_DEVICE "/dev/tap0"
#include "net.h"
#include "route.h"
#include "utils.h"
+#include "xalloc.h"
-enum {
+typedef enum device_type_t {
DEVICE_TYPE_ETHERTAP,
DEVICE_TYPE_TUN,
DEVICE_TYPE_TAP,
-};
+} device_type_t;
int device_fd = -1;
-int device_type;
-char *device;
-char *iface;
-char ifrname[IFNAMSIZ];
-char *device_info;
+static device_type_t device_type;
+char *device = NULL;
+char *iface = NULL;
+static char ifrname[IFNAMSIZ];
+static 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;
-int setup_device(void)
+bool setup_device(void)
{
struct ifreq ifr;
cp();
if(!get_config_string(lookup_config(config_tree, "Device"), &device))
- device = DEFAULT_DEVICE;
+ device = xstrdup(DEFAULT_DEVICE);
if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
-#ifdef HAVE_TUNTAP
- iface = netname;
+#ifdef HAVE_LINUX_IF_TUN_H
+ if (netname != NULL)
+ iface = xstrdup(netname);
#else
- iface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
+ iface = xstrdup(rindex(device, '/') ? rindex(device, '/') + 1 : device);
#endif
device_fd = open(device, O_RDWR | O_NONBLOCK);
if(device_fd < 0) {
logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
- return -1;
+ return false;
}
-#ifdef HAVE_TUNTAP
+#ifdef HAVE_LINUX_IF_TUN_H
/* Ok now check if this is an old ethertap or a new tun/tap thingie */
memset(&ifr, 0, sizeof(ifr));
if(iface)
strncpy(ifr.ifr_name, iface, IFNAMSIZ);
- if(!ioctl(device_fd, TUNSETIFF, (void *) &ifr)) {
+ if(!ioctl(device_fd, TUNSETIFF, &ifr)) {
strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
- iface = ifrname;
- } else if(!ioctl(device_fd, (('T' << 8) | 202), (void *) &ifr)) {
+ if(iface) free(iface);
+ iface = xstrdup(ifrname);
+ } else if(!ioctl(device_fd, (('T' << 8) | 202), &ifr)) {
logger(LOG_WARNING, _("Old ioctl() request was needed for %s"), device);
strncpy(ifrname, ifr.ifr_name, IFNAMSIZ);
- iface = ifrname;
+ if(iface) free(iface);
+ iface = xstrdup(ifrname);
} else
#endif
{
if(routing_mode == RMODE_ROUTER)
- overwrite_mac = 1;
+ overwrite_mac = true;
device_info = _("Linux ethertap device");
device_type = DEVICE_TYPE_ETHERTAP;
- iface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
+ if(iface)
+ free(iface);
+ iface = xstrdup(rindex(device, '/') ? rindex(device, '/') + 1 : device);
}
logger(LOG_INFO, _("%s is a %s"), device, device_info);
- return 0;
+ return true;
}
void close_device(void)
cp();
close(device_fd);
+
+ free(device);
+ free(iface);
}
-int read_packet(vpn_packet_t *packet)
+bool read_packet(vpn_packet_t *packet)
{
int lenin;
if(lenin <= 0) {
logger(LOG_ERR, _("Error while reading from %s %s: %s"),
device_info, device, strerror(errno));
- return -1;
+ return false;
}
packet->len = lenin + 10;
if(lenin <= 0) {
logger(LOG_ERR, _("Error while reading from %s %s: %s"),
device_info, device, strerror(errno));
- return -1;
+ return false;
}
packet->len = lenin;
if(lenin <= 0) {
logger(LOG_ERR, _("Error while reading from %s %s: %s"),
device_info, device, strerror(errno));
- return -1;
+ return false;
}
packet->len = lenin - 2;
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();
if(write(device_fd, packet->data + 10, packet->len - 10) < 0) {
logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
strerror(errno));
- return -1;
+ return false;
}
break;
case DEVICE_TYPE_TAP:
if(write(device_fd, packet->data, packet->len) < 0) {
logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
strerror(errno));
- return -1;
+ return false;
}
break;
case DEVICE_TYPE_ETHERTAP:
if(write(device_fd, packet->data - 2, packet->len + 2) < 0) {
logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
strerror(errno));
- return -1;
+ return false;
}
break;
}
device_total_out += packet->len;
- return 0;
+ return true;
}
void dump_device_stats(void)
projects / tinc / blobdiff