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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 char *device_info;
- 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, LOCALSTATEDIR "/run/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);
- device_info = "VDE socket";
- 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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