tinc/src/raw_socket/device.c
Guus Sliepen b069da90d6 Consistently allocate device and iface variables on the heap.
This fixes a segfault when no Device has been specified and tinc exits, and it
would try to free() a static string. Thanks to Borg for spottin.
2009-01-03 22:06:10 +01:00

142 lines
3.3 KiB
C

/*
device.c -- raw socket
Copyright (C) 2002-2005 Ivo Timmermans,
2002-2006 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 <netpacket/packet.h>
#include "conf.h"
#include "net.h"
#include "logger.h"
#include "utils.h"
#include "route.h"
#include "xalloc.h"
int device_fd = -1;
char *device;
char *iface;
static char ifrname[IFNAMSIZ];
static char *device_info;
static int device_total_in = 0;
static int device_total_out = 0;
bool setup_device(void)
{
struct ifreq ifr;
struct sockaddr_ll sa;
cp();
if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
iface = xstrdup("eth0");
if(!get_config_string(lookup_config(config_tree, "Device"), &device))
device = xstrdup(iface);
device_info = _("raw socket");
if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
logger(LOG_ERR, _("Could not open %s: %s"), device_info,
strerror(errno));
return false;
}
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {
close(device_fd);
logger(LOG_ERR, _("Can't find interface %s: %s"), iface,
strerror(errno));
return false;
}
memset(&sa, '0', sizeof(sa));
sa.sll_family = AF_PACKET;
sa.sll_protocol = htons(ETH_P_ALL);
sa.sll_ifindex = ifr.ifr_ifindex;
if(bind(device_fd, (struct sockaddr *) &sa, (socklen_t) sizeof(sa))) {
logger(LOG_ERR, _("Could not bind %s to %s: %s"), device, iface, strerror(errno));
return false;
}
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();
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;
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);
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 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);
}