struct nlif_handle *nl_init_interface_handler(void)
{
struct nlif_handle *h;
h = nlif_open();
if (h == NULL)
return NULL;
if (nlif_query(h) == -1) {
free(h);
return NULL;
}
fcntl(nlif_fd(h), F_SETFL, O_NONBLOCK);
return h;
}
static void iface_activity_cb(struct ev_loop *loop, ev_io *w, int revents)
{
struct nlif_handle *nlif_handle = w->data;
ev_io_stop(loop, w);
if (revents & EV_ERROR) {
int if_fd;
iface_table_close(nlif_handle);
nlif_handle = iface_table_open();
if (!nlif_handle)
exit(EXIT_FAILURE);
if_fd = nlif_fd(nlif_handle);
if (if_fd < 0) {
exit(EXIT_FAILURE);
}
ev_io_set(w, if_fd, EV_READ);
}
if (revents & EV_READ) {
iface_treat_message(nlif_handle);
}
ev_io_start(loop, w);
}
/**
* \brief Packet server thread function.
*
* Connect to netfilter to ask a netlink. Read packet
* on this link. Check if packet useful for NuFW. If yes, add it to packet
* list and/or send it to NuAuth.
*
* When using NetFilter queue, it uses treat_packet() as callback.
* In ipq mode it uses an internal packet parser and process mechanism.
*
* \return NULL
*/
void *packetsrv(void *void_arg)
{
int fatal_error = 0;
ev_io iface_watcher;
ev_timer timer;
int fd;
#ifdef HAVE_NFQ_INDEV_NAME
struct nlif_handle *nlif_handle;
int if_fd;
#endif
#ifdef HAVE_NFQ_INDEV_NAME
nlif_handle = iface_table_open();
if (!nlif_handle)
exit(EXIT_FAILURE);
if_fd = nlif_fd(nlif_handle);
if (if_fd < 0) {
exit(EXIT_FAILURE);
}
fd = packetsrv_open((void *) nlif_handle);
#else
fd = packetsrv_open(NULL);
#endif
if (fd < 0) {
exit(EXIT_FAILURE);
}
log_area_printf(DEBUG_AREA_MAIN | DEBUG_AREA_PACKET, DEBUG_LEVEL_DEBUG,
"[+] Packet server started");
nufw_loop = ev_loop_new(0);
/* add io for nfq */
ev_io_init(&nufw_nfq_watcher , packetsrv_activity_cb, fd, EV_READ);
nufw_nfq_watcher.data = nlif_handle;
ev_io_start(nufw_loop, &nufw_nfq_watcher);
#ifdef HAVE_NFQ_INDEV_NAME
/* add io for iface */
ev_io_init(&iface_watcher , iface_activity_cb, if_fd, EV_READ);
iface_watcher.data = nlif_handle;
ev_io_start(nufw_loop, &iface_watcher);
#endif
fd = nussl_session_get_fd(tls.session);
if (fd >= 0) {
ev_io_init(&tls.ev_io, tls_activity_cb,
nussl_session_get_fd(tls.session), EV_READ);
tls.ev_io.data = &nufw_nfq_watcher;
ev_io_start(nufw_loop, &tls.ev_io);
}
p_pckt_rx = 0;
p_pckt_tx = 0;
ev_timer_init(&timer, cleaning_timer_cb, 0, 1.0 * CLEANING_DELAY);
timer.data = &nufw_nfq_watcher;
ev_timer_start(nufw_loop, &timer);
/* start loop */
ev_loop(nufw_loop, 0);
ev_loop_destroy(nufw_loop);
#ifdef HAVE_NFQ_INDEV_NAME
iface_table_close(nlif_handle);
#endif
packetsrv_close(!fatal_error);
log_area_printf(DEBUG_AREA_MAIN | DEBUG_AREA_PACKET,
DEBUG_LEVEL_WARNING,
"[+] Leave packet server thread");
return NULL;
}