/* Returns whether something was read */
int pcap_read_on_nonselect(struct npool *nsp) {
gh_lnode_t *current, *next;
struct nevent *nse;
int ret = 0;
for (current = gh_list_first_elem(&nsp->pcap_read_events);
current != NULL;
current = next) {
nse = lnode_nevent2(current);
if (do_actual_pcap_read(nse) == 1) {
/* something received */
ret++;
break;
}
next = gh_lnode_next(current);
}
return ret;
}
/* Iterate through all the event lists (such as connect_events, read_events,
* timer_events, etc) and take action for those that have completed (due to
* timeout, i/o, etc) */
void iterate_through_event_lists(struct npool *nsp) {
gh_lnode_t *current, *next, *last;
last = gh_list_last_elem(&nsp->active_iods);
for (current = gh_list_first_elem(&nsp->active_iods);
current != NULL && gh_lnode_prev(current) != last;
current = next) {
struct niod *nsi = container_of(current, struct niod, nodeq);
process_iod_events(nsp, nsi, get_evmask(nsp, nsi));
next = gh_lnode_next(current);
if (nsi->state == NSIOD_STATE_DELETED) {
gh_list_remove(&nsp->active_iods, current);
gh_list_prepend(&nsp->free_iods, current);
}
}
/* iterate through timers and expired events */
process_expired_events(nsp);
}
void process_iod_events(struct npool *nsp, struct niod *nsi, int ev) {
int i = 0;
/* store addresses of the pointers to the first elements of each kind instead
* of storing the values, as a connect can add a read for instance */
gh_lnode_t **start_elems[] = {
&nsi->first_connect,
&nsi->first_read,
&nsi->first_write,
#if HAVE_PCAP
&nsi->first_pcap_read,
#endif
NULL
};
gh_list_t *evlists[] = {
&nsp->connect_events,
&nsp->read_events,
&nsp->write_events,
#if HAVE_PCAP
&nsp->pcap_read_events,
#endif
NULL
};
assert(nsp == nsi->nsp);
nsock_log_debug_all("Processing events on IOD %lu (ev=%d)", nsi->id, ev);
/* We keep the events separate because we want to handle them in the
* order: connect => read => write => timer for several reasons:
*
* 1) Makes sure we have gone through all the net i/o events before
* a timer expires (would be a shame to timeout after the data was
* available but before we delivered the events
*
* 2) The connect() results often lead to a read or write that can be
* processed in the same cycle. In the same way, read() often
* leads to write().
*/
for (i = 0; evlists[i] != NULL; i++) {
gh_lnode_t *current, *next, *last;
/* for each list, get the last event and don't look past it as an event
* could add another event in the same list and so on... */
last = gh_list_last_elem(evlists[i]);
for (current = *start_elems[i];
current != NULL && gh_lnode_prev(current) != last;
current = next) {
struct nevent *nse;
#if HAVE_PCAP
if (evlists[i] == &nsi->nsp->pcap_read_events)
nse = lnode_nevent2(current);
else
#endif
nse = lnode_nevent(current);
/* events are grouped by IOD. Break if we're done with the events for the
* current IOD */
if (nse->iod != nsi)
break;
process_event(nsp, evlists[i], nse, ev);
next = gh_lnode_next(current);
if (nse->event_done) {
/* event is done, remove it from the event list and update IOD pointers
* to the first events of each kind */
update_first_events(nse);
gh_list_remove(evlists[i], current);
gh_list_append(&nsp->free_events, &nse->nodeq_io);
if (nse->timeout.tv_sec)
gh_heap_remove(&nsp->expirables, &nse->expire);
}
}
}
}
/* If nsock_iod_new returned success, you must free the iod when you are done with
* it to conserve memory (and in some cases, sockets). After this call,
* nsockiod may no longer be used -- you need to create a new one with
* nsock_iod_new(). pending_response tells what to do with any events that are
* pending on this nsock_iod. This can be NSOCK_PENDING_NOTIFY (send a KILL
* notification to each event), NSOCK_PENDING_SILENT (do not send notification
* to the killed events), or NSOCK_PENDING_ERROR (print an error message and
* quit the program) */
void nsock_iod_delete(nsock_iod nsockiod, enum nsock_del_mode pending_response) {
struct niod *nsi = (struct niod *)nsockiod;
gh_lnode_t *evlist_ar[3];
gh_list_t *corresp_list[3];
int i;
gh_lnode_t *current, *next;
assert(nsi);
if (nsi->state == NSIOD_STATE_DELETED) {
/* This nsi is already marked as deleted, will probably be removed from the
* list very soon. Just return to avoid breaking reentrancy. */
return;
}
nsock_log_info("nsock_iod_delete (IOD #%lu)", nsi->id);
if (nsi->events_pending > 0) {
/* shit -- they killed the struct niod while an event was still pending on it.
* Maybe I should store the pending events in the iod. On the other hand,
* this should be a pretty rare occurrence and so I'll save space and hassle
* by just locating the events here by searching through the active events
* list */
if (pending_response == NSOCK_PENDING_ERROR)
fatal("nsock_iod_delete called with argument NSOCK_PENDING_ERROR on a nsock_iod that has %d pending event(s) associated with it", nsi->events_pending);
assert(pending_response == NSOCK_PENDING_NOTIFY || pending_response == NSOCK_PENDING_SILENT);
evlist_ar[0] = nsi->first_connect;
evlist_ar[1] = nsi->first_read;
evlist_ar[2] = nsi->first_write;
corresp_list[0] = &nsi->nsp->connect_events;
corresp_list[1] = &nsi->nsp->read_events;
corresp_list[2] = &nsi->nsp->write_events;
for (i = 0; i < 3 && nsi->events_pending > 0; i++) {
for (current = evlist_ar[i]; current != NULL; current = next) {
struct nevent *nse;
next = gh_lnode_next(current);
nse = lnode_nevent(current);
/* we're done with this list of events for the current IOD */
if (nse->iod != nsi)
break;
nevent_delete(nsi->nsp, nse, corresp_list[i], current, pending_response == NSOCK_PENDING_NOTIFY);
}
}
}
if (nsi->events_pending != 0)
fatal("Trying to delete NSI, but could not find %d of the purportedly pending events on that IOD.\n", nsi->events_pending);
/* Make sure we no longer select on this socket, in case the socket counts
* weren't already decremented to zero. */
if (nsi->sd >= 0)
socket_count_zero(nsi, nsi->nsp);
free(nsi->hostname);
#if HAVE_OPENSSL
/* Close any SSL resources */
if (nsi->ssl) {
/* No longer free session because copy nsi stores is not reference counted */
#if 0
if (nsi->ssl_session)
SSL_SESSION_free(nsi->ssl_session);
nsi->ssl_session = NULL;
#endif
if (SSL_shutdown(nsi->ssl) == -1) {
nsock_log_info("nsock_iod_delete: SSL shutdown failed (%s) on NSI %li",
ERR_reason_error_string(SSL_get_error(nsi->ssl, -1)), nsi->id);
}
/* I don't really care if the SSL_shutdown() succeeded politely. I could
* make the SD blocking temporarily for this, but I'm hoping it will succeed
* 95% of the time because we can usually write to a socket. */
SSL_free(nsi->ssl);
nsi->ssl = NULL;
}
#endif
if (nsi->sd >= 0 && nsi->sd != STDIN_FILENO) {
close(nsi->sd);
nsi->sd = -1;
}
nsi->state = NSIOD_STATE_DELETED;
nsi->userdata = NULL;
if (nsi->ipoptslen)
free(nsi->ipopts);
#if HAVE_PCAP
if (nsi->pcap){
mspcap *mp = (mspcap *)nsi->pcap;
if (mp->pt){
pcap_close(mp->pt);
mp->pt = NULL;
}
if (mp->pcap_desc) {
/* pcap_close() will close the associated pcap descriptor */
mp->pcap_desc = -1;
}
if (mp->pcap_device) {
free(mp->pcap_device);
mp->pcap_device = NULL;
}
free(mp);
nsi->pcap = NULL;
}
#endif
if (nsi->px_ctx)
proxy_chain_context_delete(nsi->px_ctx);
}
/* Cancel an event (such as a timer or read request). If notify is nonzero, the
* requester will be sent an event CANCELLED status back to the given handler.
* But in some cases there is no need to do this (like if the function deleting
* it is the one which created it), in which case 0 can be passed to skip the
* step. This function returns zero if the event is not found, nonzero
* otherwise. */
int nsock_event_cancel(nsock_pool ms_pool, nsock_event_id id, int notify) {
mspool *nsp = (mspool *)ms_pool;
enum nse_type type;
unsigned int i;
gh_list_t *event_list = NULL, *event_list2 = NULL;
gh_lnode_t *current, *next;
msevent *nse = NULL;
assert(nsp);
type = get_event_id_type(id);
nsock_log_info(nsp, "Event #%li (type %s) cancelled", id, nse_type2str(type));
/* First we figure out what list it is in */
switch (type) {
case NSE_TYPE_CONNECT:
case NSE_TYPE_CONNECT_SSL:
event_list = &nsp->connect_events;
break;
case NSE_TYPE_READ:
event_list = &nsp->read_events;
break;
case NSE_TYPE_WRITE:
event_list = &nsp->write_events;
break;
case NSE_TYPE_TIMER:
for (i = 0; i < gh_heap_count(&nsp->expirables); i++) {
gh_hnode_t *hnode;
hnode = gh_heap_find(&nsp->expirables, i);
nse = container_of(hnode, msevent, expire);
if (nse->id == id)
return msevent_cancel(nsp, nse, NULL, NULL, notify);
}
return 0;
#if HAVE_PCAP
case NSE_TYPE_PCAP_READ:
event_list = &nsp->read_events;
event_list2 = &nsp->pcap_read_events;
break;
#endif
default:
fatal("Bogus event type in nsock_event_cancel"); break;
}
/* Now we try to find the event in the list */
for (current = gh_list_first_elem(event_list); current != NULL; current = next) {
next = gh_lnode_next(current);
nse = lnode_msevent(current);
if (nse->id == id)
break;
}
if (current == NULL && event_list2) {
event_list = event_list2;
for (current = gh_list_first_elem(event_list); current != NULL; current = next) {
next = gh_lnode_next(current);
nse = lnode_msevent2(current);
if (nse->id == id)
break;
}
}
if (current == NULL)
return 0;
return msevent_cancel(nsp, nse, event_list, current, notify);
}
/* If nsp_new returned success, you must free the nsp when you are done with it
* to conserve memory (and in some cases, sockets). After this call, nsp may no
* longer be used. Any pending events are sent an NSE_STATUS_KILL callback and
* all outstanding iods are deleted. */
void nsp_delete(nsock_pool ms_pool) {
mspool *nsp = (mspool *)ms_pool;
msevent *nse;
msiod *nsi;
int i;
gh_lnode_t *current, *next;
gh_list_t *event_lists[] = {
&nsp->connect_events,
&nsp->read_events,
&nsp->write_events,
#if HAVE_PCAP
&nsp->pcap_read_events,
#endif
NULL
};
assert(nsp);
/* First I go through all the events sending NSE_STATUS_KILL */
for (i = 0; event_lists[i] != NULL; i++) {
while (gh_list_count(event_lists[i]) > 0) {
gh_lnode_t *lnode = gh_list_pop(event_lists[i]);
assert(lnode);
#if HAVE_PCAP
if (event_lists[i] == &nsp->pcap_read_events)
nse = lnode_msevent2(lnode);
else
#endif
nse = lnode_msevent(lnode);
assert(nse);
nse->status = NSE_STATUS_KILL;
nsock_trace_handler_callback(nsp, nse);
nse->handler(nsp, nse, nse->userdata);
if (nse->iod) {
nse->iod->events_pending--;
assert(nse->iod->events_pending >= 0);
}
msevent_delete(nsp, nse);
}
gh_list_free(event_lists[i]);
}
/* Kill timers too, they're not in event lists */
while (gh_heap_count(&nsp->expirables) > 0) {
gh_hnode_t *hnode;
hnode = gh_heap_pop(&nsp->expirables);
nse = container_of(hnode, msevent, expire);
if (nse->type == NSE_TYPE_TIMER) {
nse->status = NSE_STATUS_KILL;
nsock_trace_handler_callback(nsp, nse);
nse->handler(nsp, nse, nse->userdata);
msevent_delete(nsp, nse);
gh_list_append(&nsp->free_events, &nse->nodeq_io);
}
}
gh_heap_free(&nsp->expirables);
/* foreach msiod */
for (current = gh_list_first_elem(&nsp->active_iods);
current != NULL;
current = next) {
next = gh_lnode_next(current);
nsi = container_of(current, msiod, nodeq);
nsi_delete(nsi, NSOCK_PENDING_ERROR);
gh_list_remove(&nsp->active_iods, current);
gh_list_prepend(&nsp->free_iods, &nsi->nodeq);
}
/* Now we free all the memory in the free iod list */
while ((current = gh_list_pop(&nsp->free_iods))) {
nsi = container_of(current, msiod, nodeq);
free(nsi);
}
while ((current = gh_list_pop(&nsp->free_events))) {
nse = lnode_msevent(current);
free(nse);
}
gh_list_free(&nsp->active_iods);
gh_list_free(&nsp->free_iods);
gh_list_free(&nsp->free_events);
nsock_engine_destroy(nsp);
#if HAVE_OPENSSL
if (nsp->sslctx != NULL)
SSL_CTX_free(nsp->sslctx);
#endif
free(nsp);
}
