6b92ac505d
The offset value indicates where the actual payload starts, so we can process both legacy and SPTPS UDP packets without having to do casting tricks and/or moving memory around.
132 lines
3.2 KiB
C
132 lines
3.2 KiB
C
/*
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device.c -- VDE plug
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Copyright (C) 2013 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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "system.h"
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#include <libvdeplug_dyn.h>
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#include "conf.h"
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#include "device.h"
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#include "names.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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static struct vdepluglib plug;
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static struct vdeconn *conn = NULL;
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static int port = 0;
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static char *group = NULL;
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static char *device_info;
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static bool setup_device(void) {
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libvdeplug_dynopen(plug);
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if(!plug.dl_handle) {
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logger(DEBUG_ALWAYS, LOG_ERR, "Could not open libvdeplug library!");
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return false;
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}
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if(!get_config_string(lookup_config(config_tree, "Device"), &device))
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xasprintf(&device, LOCALSTATEDIR "/run/vde.ctl");
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get_config_string(lookup_config(config_tree, "Interface"), &iface);
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get_config_int(lookup_config(config_tree, "VDEPort"), &port);
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get_config_string(lookup_config(config_tree, "VDEGroup"), &group);
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device_info = "VDE socket";
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struct vde_open_args args = {
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.port = port,
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.group = group,
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.mode = 0700,
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};
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conn = plug.vde_open(device, identname, &args);
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if(!conn) {
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logger(DEBUG_ALWAYS, LOG_ERR, "Could not open VDE socket %s", device);
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return false;
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}
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device_fd = plug.vde_datafd(conn);
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#ifdef FD_CLOEXEC
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fcntl(device_fd, F_SETFD, FD_CLOEXEC);
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#endif
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logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
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if(routing_mode == RMODE_ROUTER)
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overwrite_mac = true;
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return true;
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}
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static void close_device(void) {
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if(conn) {
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plug.vde_close(conn); conn = NULL;
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}
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if(plug.dl_handle)
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libvdeplug_dynclose(plug);
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free(device); device = NULL;
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free(iface); iface = NULL;
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device_info = NULL;
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}
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static bool read_packet(vpn_packet_t *packet) {
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int lenin = (ssize_t)plug.vde_recv(conn, DATA(packet), MTU, 0);
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if(lenin <= 0) {
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logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
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event_exit();
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return false;
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}
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packet->len = lenin;
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logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, device_info);
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return true;
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}
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static bool write_packet(vpn_packet_t *packet) {
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if((ssize_t)plug.vde_send(conn, DATA(packet), packet->len, 0) < 0) {
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if(errno != EINTR && errno != EAGAIN) {
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logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
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event_exit();
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}
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return false;
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}
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return true;
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}
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const devops_t vde_devops = {
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.setup = setup_device,
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.close = close_device,
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.read = read_packet,
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.write = write_packet,
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};
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