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/*
device.c -- VDE plug
Copyright (C) 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"
#include <libvdeplug_dyn.h>
#include "conf.h"
#include "device.h"
#include "net.h"
#include "logger.h"
#include "utils.h"
#include "route.h"
#include "xalloc.h"
static struct vdepluglib plug;
static struct vdeconn *conn = NULL;
static int port = 0;
static char *group = NULL;
static const char *device_info = "VDE socket";
extern char *identname;
extern volatile bool running;
static uint64_t device_total_in = 0;
static uint64_t device_total_out = 0;
static bool setup_device(void) {
libvdeplug_dynopen(plug);
if(!plug.dl_handle) {
logger(LOG_ERR, "Could not open libvdeplug library!");
return false;
}
if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
xasprintf(&device, RUNSTATEDIR "/vde.ctl");
}
get_config_string(lookup_config(config_tree, "Interface"), &iface);
get_config_int(lookup_config(config_tree, "VDEPort"), &port);
get_config_string(lookup_config(config_tree, "VDEGroup"), &group);
struct vde_open_args args = {
.port = port,
.group = group,
.mode = 0700,
};
conn = plug.vde_open(device, identname, &args);
if(!conn) {
logger(LOG_ERR, "Could not open VDE socket %s", device);
return false;
}
device_fd = plug.vde_datafd(conn);
#ifdef FD_CLOEXEC
fcntl(device_fd, F_SETFD, FD_CLOEXEC);
#endif
logger(LOG_INFO, "%s is a %s", device, device_info);
if(routing_mode == RMODE_ROUTER) {
overwrite_mac = true;
}
return true;
}
static void close_device(void) {
if(conn) {
plug.vde_close(conn);
}
if(plug.dl_handle) {
libvdeplug_dynclose(plug);
}
free(device);
free(iface);
}
static bool read_packet(vpn_packet_t *packet) {
int lenin = (ssize_t)plug.vde_recv(conn, packet->data, MTU, 0);
if(lenin <= 0) {
logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
running = false;
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;
}
static bool write_packet(vpn_packet_t *packet) {
if((ssize_t)plug.vde_send(conn, packet->data, packet->len, 0) < 0) {
if(errno != EINTR && errno != EAGAIN) {
logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
running = false;
}
return false;
}
device_total_out += packet->len;
return true;
}
static void dump_device_stats(void) {
logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
}
const devops_t vde_devops = {
.setup = setup_device,
.close = close_device,
.read = read_packet,
.write = write_packet,
.dump_stats = dump_device_stats,
};
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