8ac096b5bf
This allows tincctl to receive log messages from a running tincd, independent of what is logged to syslog or to file. Tincctl can receive debug messages with an arbitrary level.
157 lines
4 KiB
C
157 lines
4 KiB
C
/*
|
|
device.c -- raw socket
|
|
Copyright (C) 2002-2005 Ivo Timmermans,
|
|
2002-2012 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.,
|
|
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include "system.h"
|
|
|
|
#ifdef HAVE_NETPACKET_PACKET_H
|
|
#include <netpacket/packet.h>
|
|
#endif
|
|
|
|
#include "conf.h"
|
|
#include "device.h"
|
|
#include "net.h"
|
|
#include "logger.h"
|
|
#include "utils.h"
|
|
#include "route.h"
|
|
#include "xalloc.h"
|
|
|
|
#if defined(PF_PACKET) && defined(ETH_P_ALL) && defined(AF_PACKET)
|
|
static char *device_info;
|
|
|
|
static uint64_t device_total_in = 0;
|
|
static uint64_t device_total_out = 0;
|
|
|
|
static bool setup_device(void) {
|
|
struct ifreq ifr;
|
|
struct sockaddr_ll sa;
|
|
|
|
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(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s", device_info,
|
|
strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
memset(&ifr, 0, sizeof ifr);
|
|
|
|
#ifdef FD_CLOEXEC
|
|
fcntl(device_fd, F_SETFD, FD_CLOEXEC);
|
|
#endif
|
|
|
|
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
|
|
if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {
|
|
close(device_fd);
|
|
logger(DEBUG_ALWAYS, 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(DEBUG_ALWAYS, LOG_ERR, "Could not bind %s to %s: %s", device, iface, strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
|
|
|
|
return true;
|
|
}
|
|
|
|
static void close_device(void) {
|
|
close(device_fd);
|
|
|
|
free(device);
|
|
free(iface);
|
|
}
|
|
|
|
static bool read_packet(vpn_packet_t *packet) {
|
|
int inlen;
|
|
|
|
if((inlen = read(device_fd, packet->data, MTU)) <= 0) {
|
|
logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info,
|
|
device, strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
packet->len = inlen;
|
|
|
|
device_total_in += packet->len;
|
|
|
|
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len,
|
|
device_info);
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool write_packet(vpn_packet_t *packet) {
|
|
logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s",
|
|
packet->len, device_info);
|
|
|
|
if(write(device_fd, packet->data, packet->len) < 0) {
|
|
logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device,
|
|
strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
device_total_out += packet->len;
|
|
|
|
return true;
|
|
}
|
|
|
|
static void dump_device_stats(void) {
|
|
logger(DEBUG_ALWAYS, LOG_DEBUG, "Statistics for %s %s:", device_info, device);
|
|
logger(DEBUG_ALWAYS, LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
|
|
logger(DEBUG_ALWAYS, LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
|
|
}
|
|
|
|
const devops_t raw_socket_devops = {
|
|
.setup = setup_device,
|
|
.close = close_device,
|
|
.read = read_packet,
|
|
.write = write_packet,
|
|
.dump_stats = dump_device_stats,
|
|
};
|
|
|
|
#else
|
|
|
|
static bool not_supported(void) {
|
|
logger(DEBUG_ALWAYS, LOG_ERR, "Raw socket device not supported on this platform");
|
|
return false;
|
|
}
|
|
|
|
const devops_t raw_socket_devops = {
|
|
.setup = not_supported,
|
|
.close = NULL,
|
|
.read = NULL,
|
|
.write = NULL,
|
|
.dump_stats = NULL,
|
|
};
|
|
#endif
|