b069da90d6
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.
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
/*
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device.c -- raw socket
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Copyright (C) 2002-2005 Ivo Timmermans,
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2002-2006 Guus Sliepen <guus@tinc-vpn.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*/
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#include "system.h"
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#include <netpacket/packet.h>
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#include "conf.h"
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#include "net.h"
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#include "logger.h"
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#include "utils.h"
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#include "route.h"
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#include "xalloc.h"
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int device_fd = -1;
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char *device;
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char *iface;
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static char ifrname[IFNAMSIZ];
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static char *device_info;
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static int device_total_in = 0;
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static int device_total_out = 0;
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bool setup_device(void)
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{
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struct ifreq ifr;
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struct sockaddr_ll sa;
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cp();
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if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
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iface = xstrdup("eth0");
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if(!get_config_string(lookup_config(config_tree, "Device"), &device))
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device = xstrdup(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) {
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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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}
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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)) {
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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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}
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memset(&sa, '0', sizeof(sa));
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sa.sll_family = AF_PACKET;
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sa.sll_protocol = htons(ETH_P_ALL);
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sa.sll_ifindex = ifr.ifr_ifindex;
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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;
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}
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void close_device(void)
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{
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cp();
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close(device_fd);
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}
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bool read_packet(vpn_packet_t *packet)
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{
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int lenin;
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cp();
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if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
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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;
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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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{
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cp();
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ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
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packet->len, device_info);
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if(write(device_fd, packet->data, packet->len) < 0) {
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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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}
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device_total_out += packet->len;
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return true;
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}
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void dump_device_stats(void)
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{
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cp();
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logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
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logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
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logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);
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}
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