/**
* Main event loop for OpenVPN in UDP server mode.
* @ingroup eventloop
*
* This function implements OpenVPN's main event loop for UDP server mode.
* At this time, OpenVPN does not yet support multithreading. This
* function's name is therefore slightly misleading.
*
* @param top - Top-level context structure.
*/
static void
tunnel_server_udp_single_threaded (struct context *top)
{
struct multi_context multi;
top->mode = CM_TOP;
context_clear_2 (top);
/* initialize top-tunnel instance */
init_instance_handle_signals (top, top->es, CC_HARD_USR1_TO_HUP);
if (IS_SIG (top))
return;
/* initialize global multi_context object */
multi_init (&multi, top, false, MC_SINGLE_THREADED);
/* initialize our cloned top object */
multi_top_init (&multi, top, true);
/* initialize management interface */
init_management_callback_multi (&multi);
/* finished with initialization */
initialization_sequence_completed (top, ISC_SERVER); /* --mode server --proto udp */
/* per-packet event loop */
while (true)
{
perf_push (PERF_EVENT_LOOP);
/* set up and do the io_wait() */
multi_get_timeout (&multi, &multi.top.c2.timeval);
io_wait (&multi.top, p2mp_iow_flags (&multi));
MULTI_CHECK_SIG (&multi);
/* check on status of coarse timers */
multi_process_per_second_timers (&multi);
/* timeout? */
if (multi.top.c2.event_set_status == ES_TIMEOUT)
{
multi_process_timeout (&multi, MPP_PRE_SELECT|MPP_CLOSE_ON_SIGNAL);
}
else
{
/* process I/O */
multi_process_io_udp (&multi);
MULTI_CHECK_SIG (&multi);
}
perf_pop ();
}
/* shut down management interface */
uninit_management_callback_multi (&multi);
/* save ifconfig-pool */
multi_ifconfig_pool_persist (&multi, true);
/* tear down tunnel instance (unless --persist-tun) */
multi_uninit (&multi);
multi_top_free (&multi);
close_instance (top);
}
/*
* Top level event loop for single-threaded operation.
* TCP mode.
*/
void
tunnel_server_tcp(struct context *top)
{
struct multi_context multi;
int status;
top->mode = CM_TOP;
context_clear_2(top);
/* initialize top-tunnel instance */
init_instance_handle_signals(top, top->es, CC_HARD_USR1_TO_HUP);
if (IS_SIG(top))
{
return;
}
/* initialize global multi_context object */
multi_init(&multi, top, true, MC_SINGLE_THREADED);
/* initialize our cloned top object */
multi_top_init(&multi, top);
/* initialize management interface */
init_management_callback_multi(&multi);
/* finished with initialization */
initialization_sequence_completed(top, ISC_SERVER); /* --mode server --proto tcp-server */
#ifdef ENABLE_ASYNC_PUSH
multi.top.c2.inotify_fd = inotify_init();
if (multi.top.c2.inotify_fd < 0)
{
msg(D_MULTI_ERRORS | M_ERRNO, "MULTI: inotify_init error");
}
#endif
/* per-packet event loop */
while (true)
{
perf_push(PERF_EVENT_LOOP);
/* wait on tun/socket list */
multi_get_timeout(&multi, &multi.top.c2.timeval);
status = multi_tcp_wait(&multi.top, multi.mtcp);
MULTI_CHECK_SIG(&multi);
/* check on status of coarse timers */
multi_process_per_second_timers(&multi);
/* timeout? */
if (status > 0)
{
/* process the I/O which triggered select */
multi_tcp_process_io(&multi);
MULTI_CHECK_SIG(&multi);
}
else if (status == 0)
{
multi_tcp_action(&multi, NULL, TA_TIMEOUT, false);
}
perf_pop();
}
#ifdef ENABLE_ASYNC_PUSH
close(top->c2.inotify_fd);
#endif
/* shut down management interface */
uninit_management_callback_multi(&multi);
/* save ifconfig-pool */
multi_ifconfig_pool_persist(&multi, true);
/* tear down tunnel instance (unless --persist-tun) */
multi_uninit(&multi);
multi_top_free(&multi);
close_instance(top);
}
