/* Adds an event to the appropriate nsp event list, handles housekeeping such as
* adjusting the descriptor select/poll lists, registering the timeout value,
* etc. */
void nsock_pool_add_event(struct npool *nsp, struct nevent *nse) {
nsock_log_debug("NSE #%lu: Adding event (timeout in %ldms)",
nse->id,
(long)TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod));
nsp->events_pending++;
if (!nse->event_done && nse->timeout.tv_sec) {
/* This event is expirable, add it to the queue */
gh_heap_push(&nsp->expirables, &nse->expire);
}
/* Now we do the event type specific actions */
switch (nse->type) {
case NSE_TYPE_CONNECT:
case NSE_TYPE_CONNECT_SSL:
if (!nse->event_done) {
assert(nse->iod->sd >= 0);
socket_count_read_inc(nse->iod);
socket_count_write_inc(nse->iod);
update_events(nse->iod, nsp, EV_READ|EV_WRITE|EV_EXCEPT, EV_NONE);
}
iod_add_event(nse->iod, nse);
break;
case NSE_TYPE_READ:
if (!nse->event_done) {
assert(nse->iod->sd >= 0);
socket_count_read_inc(nse->iod);
update_events(nse->iod, nsp, EV_READ, EV_NONE);
#if HAVE_OPENSSL
if (nse->iod->ssl)
nse->sslinfo.ssl_desire = SSL_ERROR_WANT_READ;
#endif
}
iod_add_event(nse->iod, nse);
break;
case NSE_TYPE_WRITE:
if (!nse->event_done) {
assert(nse->iod->sd >= 0);
socket_count_write_inc(nse->iod);
update_events(nse->iod, nsp, EV_WRITE, EV_NONE);
#if HAVE_OPENSSL
if (nse->iod->ssl)
nse->sslinfo.ssl_desire = SSL_ERROR_WANT_WRITE;
#endif
}
iod_add_event(nse->iod, nse);
break;
case NSE_TYPE_TIMER:
/* nothing to do */
break;
#if HAVE_PCAP
case NSE_TYPE_PCAP_READ: {
mspcap *mp = (mspcap *)nse->iod->pcap;
assert(mp);
if (mp->pcap_desc >= 0) { /* pcap descriptor present */
if (!nse->event_done) {
socket_count_readpcap_inc(nse->iod);
update_events(nse->iod, nsp, EV_READ, EV_NONE);
}
nsock_log_debug_all("PCAP NSE #%lu: Adding event to READ_EVENTS", nse->id);
#if PCAP_BSD_SELECT_HACK
/* when using BSD hack we must do pcap_next() after select().
* Let's insert this pcap to bot queues, to selectable and nonselectable.
* This will result in doing pcap_next_ex() just before select() */
nsock_log_debug_all("PCAP NSE #%lu: Adding event to PCAP_READ_EVENTS", nse->id);
#endif
} else {
/* pcap isn't selectable. Add it to pcap-specific queue. */
nsock_log_debug_all("PCAP NSE #%lu: Adding event to PCAP_READ_EVENTS", nse->id);
}
iod_add_event(nse->iod, nse);
break;
}
#endif
default:
fatal("Unknown nsock event type (%d)", nse->type);
}
/* It can happen that the event already completed. In which case we can
* already deliver it, even though we're probably not inside nsock_loop(). */
if (nse->event_done) {
event_dispatch_and_delete(nsp, nse, 1);
update_first_events(nse);
nevent_unref(nsp, nse);
}
}
void process_event(struct npool *nsp, gh_list_t *evlist, struct nevent *nse, int ev) {
int match_r = 0, match_w = 0;
#if HAVE_OPENSSL
int desire_r = 0, desire_w = 0;
#endif
nsock_log_debug_all("Processing event %lu (timeout in %ldms, done=%d)",
nse->id,
(long)TIMEVAL_MSEC_SUBTRACT(nse->timeout, nsock_tod),
nse->event_done);
if (!nse->event_done) {
switch (nse->type) {
case NSE_TYPE_CONNECT:
case NSE_TYPE_CONNECT_SSL:
if (ev != EV_NONE)
handle_connect_result(nsp, nse, NSE_STATUS_SUCCESS);
if (event_timedout(nse))
handle_connect_result(nsp, nse, NSE_STATUS_TIMEOUT);
break;
case NSE_TYPE_READ:
match_r = ev & EV_READ;
match_w = ev & EV_WRITE;
#if HAVE_OPENSSL
desire_r = nse->sslinfo.ssl_desire == SSL_ERROR_WANT_READ;
desire_w = nse->sslinfo.ssl_desire == SSL_ERROR_WANT_WRITE;
if (nse->iod->ssl && ((desire_r && match_r) || (desire_w && match_w)))
handle_read_result(nsp, nse, NSE_STATUS_SUCCESS);
else
#endif
if (!nse->iod->ssl && match_r)
handle_read_result(nsp, nse, NSE_STATUS_SUCCESS);
if (event_timedout(nse))
handle_read_result(nsp, nse, NSE_STATUS_TIMEOUT);
break;
case NSE_TYPE_WRITE:
match_r = ev & EV_READ;
match_w = ev & EV_WRITE;
#if HAVE_OPENSSL
desire_r = nse->sslinfo.ssl_desire == SSL_ERROR_WANT_READ;
desire_w = nse->sslinfo.ssl_desire == SSL_ERROR_WANT_WRITE;
if (nse->iod->ssl && ((desire_r && match_r) || (desire_w && match_w)))
handle_write_result(nsp, nse, NSE_STATUS_SUCCESS);
else
#endif
if (!nse->iod->ssl && match_w)
handle_write_result(nsp, nse, NSE_STATUS_SUCCESS);
if (event_timedout(nse))
handle_write_result(nsp, nse, NSE_STATUS_TIMEOUT);
break;
case NSE_TYPE_TIMER:
if (event_timedout(nse))
handle_timer_result(nsp, nse, NSE_STATUS_SUCCESS);
break;
#if HAVE_PCAP
case NSE_TYPE_PCAP_READ:{
nsock_log_debug_all("PCAP iterating %lu", nse->id);
if (ev & EV_READ) {
/* buffer empty? check it! */
if (fs_length(&(nse->iobuf)) == 0)
do_actual_pcap_read(nse);
}
/* if already received something */
if (fs_length(&(nse->iobuf)) > 0)
handle_pcap_read_result(nsp, nse, NSE_STATUS_SUCCESS);
if (event_timedout(nse))
handle_pcap_read_result(nsp, nse, NSE_STATUS_TIMEOUT);
#if PCAP_BSD_SELECT_HACK
/* If event occurred, and we're in BSD_HACK mode, then this event was added
* to two queues. read_event and pcap_read_event
* Of course we should destroy it only once.
* I assume we're now in read_event, so just unlink this event from
* pcap_read_event */
if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0
&& nse->event_done
&& evlist == &nsp->read_events) {
/* event is done, list is read_events and we're in BSD_HACK mode.
* So unlink event from pcap_read_events */
update_first_events(nse);
gh_list_remove(&nsp->pcap_read_events, &nse->nodeq_pcap);
nsock_log_debug_all("PCAP NSE #%lu: Removing event from PCAP_READ_EVENTS",
nse->id);
}
if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0
&& nse->event_done
&& evlist == &nsp->pcap_read_events) {
update_first_events(nse);
gh_list_remove(&nsp->read_events, &nse->nodeq_io);
nsock_log_debug_all("PCAP NSE #%lu: Removing event from READ_EVENTS",
nse->id);
}
#endif
break;
}
#endif
default:
fatal("Event has unknown type (%d)", nse->type);
}
}
if (nse->event_done) {
/* Security sanity check: don't return a functional SSL iod without
* setting an SSL data structure. */
if (nse->type == NSE_TYPE_CONNECT_SSL && nse->status == NSE_STATUS_SUCCESS)
assert(nse->iod->ssl != NULL);
nsock_log_debug_all("NSE #%lu: Sending event", nse->id);
/* WooHoo! The event is ready to be sent */
event_dispatch_and_delete(nsp, nse, 1);
}
}
/* An internal function for cancelling an event when you already have a pointer
* to the struct nevent (use nsock_event_cancel if you just have an ID). The
* event_list passed in should correspond to the type of the event. For example,
* with NSE_TYPE_READ, you would pass in &nsp->read_events;. elem is the list
* element in event_list which holds the event. Pass a nonzero for notify if
* you want the program owning the event to be notified that it has been
* cancelled */
int nevent_delete(struct npool *nsp, struct nevent *nse, gh_list_t *event_list,
gh_lnode_t *elem, int notify) {
if (nse->event_done) {
/* This event has already been marked for death somewhere else -- it will be
* gone soon (and if we try to kill it now all hell will break loose due to
* reentrancy. */
return 0;
}
nsock_log_info("%s on event #%li (type %s)", __func__, nse->id,
nse_type2str(nse->type));
/* Now that we found the event... we go through the motions of cleanly
* cancelling it */
switch (nse->type) {
case NSE_TYPE_CONNECT:
case NSE_TYPE_CONNECT_SSL:
handle_connect_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
case NSE_TYPE_READ:
handle_read_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
case NSE_TYPE_WRITE:
handle_write_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
case NSE_TYPE_TIMER:
handle_timer_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
#if HAVE_PCAP
case NSE_TYPE_PCAP_READ:
handle_pcap_read_result(nsp, nse, NSE_STATUS_CANCELLED);
break;
#endif
default:
fatal("Invalid nsock event type (%d)", nse->type);
}
assert(nse->event_done);
if (nse->timeout.tv_sec)
gh_heap_remove(&nsp->expirables, &nse->expire);
if (event_list) {
update_first_events(nse);
gh_list_remove(event_list, elem);
}
gh_list_append(&nsp->free_events, &nse->nodeq_io);
nsock_log_debug_all("NSE #%lu: Removing event from list", nse->id);
#if HAVE_PCAP
#if PCAP_BSD_SELECT_HACK
if (nse->type == NSE_TYPE_PCAP_READ) {
nsock_log_debug_all("PCAP NSE #%lu: CANCEL TEST pcap=%p read=%p curr=%p sd=%i",
nse->id, &nsp->pcap_read_events, &nsp->read_events,
event_list,((mspcap *)nse->iod->pcap)->pcap_desc);
/* If event occurred, and we're in BSD_HACK mode, then this event was added to
* two queues. read_event and pcap_read_event Of course we should
* destroy it only once. I assume we're now in read_event, so just unlink
* this event from pcap_read_event */
if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0 && event_list == &nsp->read_events) {
/* event is done, list is read_events and we're in BSD_HACK mode. So unlink
* event from pcap_read_events */
gh_list_remove(&nsp->pcap_read_events, &nse->nodeq_pcap);
nsock_log_debug_all("PCAP NSE #%lu: Removing event from PCAP_READ_EVENTS", nse->id);
}
if (((mspcap *)nse->iod->pcap)->pcap_desc >= 0 && event_list == &nsp->pcap_read_events) {
/* event is done, list is read_events and we're in BSD_HACK mode.
* So unlink event from read_events */
gh_list_remove(&nsp->read_events, &nse->nodeq_io);
nsock_log_debug_all("PCAP NSE #%lu: Removing event from READ_EVENTS", nse->id);
}
}
#endif
#endif
event_dispatch_and_delete(nsp, nse, notify);
return 1;
}
