/*
* Top level event loop for single-threaded operation.
* UDP mode.
*/
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);
}
static struct multi_instance *
multi_tcp_dispatch(struct multi_context *m, struct multi_instance *mi, const int action)
{
const unsigned int mpp_flags = MPP_PRE_SELECT|MPP_RECORD_TOUCH;
struct multi_instance *touched = mi;
m->mpp_touched = &touched;
dmsg(D_MULTI_DEBUG, "MULTI TCP: multi_tcp_dispatch a=%s mi=" ptr_format,
pract(action),
(ptr_type)mi);
switch (action)
{
case TA_TUN_READ:
read_incoming_tun(&m->top);
if (!IS_SIG(&m->top))
{
multi_process_incoming_tun(m, mpp_flags);
}
break;
case TA_SOCKET_READ:
case TA_SOCKET_READ_RESIDUAL:
ASSERT(mi);
ASSERT(mi->context.c2.link_socket);
set_prefix(mi);
read_incoming_link(&mi->context);
clear_prefix();
if (!IS_SIG(&mi->context))
{
multi_process_incoming_link(m, mi, mpp_flags);
if (!IS_SIG(&mi->context))
{
stream_buf_read_setup(mi->context.c2.link_socket);
}
}
break;
case TA_TIMEOUT:
multi_process_timeout(m, mpp_flags);
break;
case TA_TUN_WRITE:
multi_process_outgoing_tun(m, mpp_flags);
break;
case TA_TUN_WRITE_TIMEOUT:
multi_process_drop_outgoing_tun(m, mpp_flags);
break;
case TA_SOCKET_WRITE_READY:
ASSERT(mi);
multi_tcp_process_outgoing_link_ready(m, mi, mpp_flags);
break;
case TA_SOCKET_WRITE:
multi_tcp_process_outgoing_link(m, false, mpp_flags);
break;
case TA_SOCKET_WRITE_DEFERRED:
multi_tcp_process_outgoing_link(m, true, mpp_flags);
break;
case TA_INITIAL:
ASSERT(mi);
multi_tcp_set_global_rw_flags(m, mi);
multi_process_post(m, mi, mpp_flags);
break;
default:
msg(M_FATAL, "MULTI TCP: multi_tcp_dispatch, unhandled action=%d", action);
}
m->mpp_touched = NULL;
return touched;
}
