tinc/src/raw_socket/device.c

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/*
device.c -- raw socket
Copyright (C) 2002-2004 Ivo Timmermans <ivo@tinc-vpn.org>,
2002-2004 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.
$Id$
*/
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#include "system.h"
#include <netpacket/packet.h>
#include "conf.h"
#include "net.h"
#include "logger.h"
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#include "utils.h"
#include "route.h"
int device_fd = -1;
char *device;
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char *iface;
char ifrname[IFNAMSIZ];
char *device_info;
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static int device_total_in = 0;
static int device_total_out = 0;
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bool setup_device(void)
{
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struct ifreq ifr;
struct sockaddr_ll sa;
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cp();
if(!get_config_string
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(lookup_config(config_tree, "Interface"), &iface))
iface = "eth0";
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if(!get_config_string(lookup_config(config_tree, "Device"), &device))
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device = iface;
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device_info = _("raw socket");
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if((device_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0) {
logger(LOG_ERR, _("Could not open %s: %s"), device_info,
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strerror(errno));
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return false;
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}
memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
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if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {
close(device_fd);
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logger(LOG_ERR, _("Can't find interface %s: %s"), iface,
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strerror(errno));
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return false;
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}
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))) {
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logger(LOG_ERR, _("Could not bind %s to %s: %s"), device, iface, strerror(errno));
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return false;
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}
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logger(LOG_INFO, _("%s is a %s"), device, device_info);
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return true;
}
void close_device(void)
{
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cp();
close(device_fd);
}
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bool read_packet(vpn_packet_t *packet)
{
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int lenin;
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cp();
if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
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device, strerror(errno));
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return false;
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}
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packet->len = lenin;
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device_total_in += packet->len;
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
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device_info);
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return true;
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}
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bool write_packet(vpn_packet_t *packet)
{
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cp();
ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
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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,
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strerror(errno));
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return false;
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}
device_total_out += packet->len;
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return true;
}
void dump_device_stats(void)
{
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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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}