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libwebsockets/lib/service.c
Petar Paradzik b66e8e1898 cgi: fix not getting POLLHUP on fd associated to CGI STDOUT 
Signed-off-by: Petar Paradzik <petar.paradzik@sartura.hr>
2017-08-26 11:59:58 +08:00

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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2015 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "private-libwebsockets.h"
static int
lws_calllback_as_writeable(struct lws *wsi)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
int n;
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_WRITEABLE_CB, 1);
#if defined(LWS_WITH_STATS)
{
uint64_t ul = time_in_microseconds() - wsi->active_writable_req_us;
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_MS_WRITABLE_DELAY, ul);
lws_stats_atomic_max(wsi->context, pt, LWSSTATS_MS_WORST_WRITABLE_DELAY, ul);
wsi->active_writable_req_us = 0;
}
#endif
switch (wsi->mode) {
case LWSCM_RAW:
n = LWS_CALLBACK_RAW_WRITEABLE;
break;
case LWSCM_RAW_FILEDESC:
n = LWS_CALLBACK_RAW_WRITEABLE_FILE;
break;
case LWSCM_WS_CLIENT:
n = LWS_CALLBACK_CLIENT_WRITEABLE;
break;
case LWSCM_WSCL_ISSUE_HTTP_BODY:
n = LWS_CALLBACK_CLIENT_HTTP_WRITEABLE;
break;
case LWSCM_WS_SERVING:
n = LWS_CALLBACK_SERVER_WRITEABLE;
break;
default:
n = LWS_CALLBACK_HTTP_WRITEABLE;
break;
}
return user_callback_handle_rxflow(wsi->protocol->callback,
wsi, (enum lws_callback_reasons) n,
wsi->user_space, NULL, 0);
}
LWS_VISIBLE int
lws_handle_POLLOUT_event(struct lws *wsi, struct lws_pollfd *pollfd)
{
int write_type = LWS_WRITE_PONG;
struct lws_tokens eff_buf;
#ifdef LWS_USE_HTTP2
struct lws *wsi2;
#endif
int ret, m, n;
// lwsl_err("%s: %p\n", __func__, wsi);
wsi->leave_pollout_active = 0;
wsi->handling_pollout = 1;
/*
* if another thread wants POLLOUT on us, from here on while
* handling_pollout is set, he will only set leave_pollout_active.
* If we are going to disable POLLOUT, we will check that first.
*/
/*
* user callback is lowest priority to get these notifications
* actually, since other pending things cannot be disordered
*/
/* Priority 1: pending truncated sends are incomplete ws fragments
* If anything else sent first the protocol would be
* corrupted.
*/
if (wsi->trunc_len) {
if (lws_issue_raw(wsi, wsi->trunc_alloc + wsi->trunc_offset,
wsi->trunc_len) < 0) {
lwsl_info("%s signalling to close\n", __func__);
goto bail_die;
}
/* leave POLLOUT active either way */
goto bail_ok;
} else
if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
wsi->socket_is_permanently_unusable = 1;
goto bail_die; /* retry closing now */
}
if (wsi->mode == LWSCM_WSCL_ISSUE_HTTP_BODY)
goto user_service;
#ifdef LWS_USE_HTTP2
/* Priority 2: protocol packets
*/
if (wsi->pps) {
lwsl_info("servicing pps %d\n", wsi->pps);
switch (wsi->pps) {
case LWS_PPS_HTTP2_MY_SETTINGS:
case LWS_PPS_HTTP2_ACK_SETTINGS:
lws_http2_do_pps_send(lws_get_context(wsi), wsi);
break;
default:
break;
}
wsi->pps = LWS_PPS_NONE;
lws_rx_flow_control(wsi, 1);
goto bail_ok; /* leave POLLOUT active */
}
#endif
#ifdef LWS_WITH_CGI
if (wsi->cgi) {
/* also one shot */
if (pollfd)
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failed at set pollfd\n");
return 1;
}
goto user_service_go_again;
}
#endif
/* Priority 3: pending control packets (pong or close)
*
* 3a: close notification packet requested from close api
*/
if (wsi->state == LWSS_WAITING_TO_SEND_CLOSE_NOTIFICATION) {
lwsl_debug("sending close packet\n");
wsi->waiting_to_send_close_frame = 0;
n = lws_write(wsi, &wsi->u.ws.ping_payload_buf[LWS_PRE],
wsi->u.ws.close_in_ping_buffer_len,
LWS_WRITE_CLOSE);
if (n >= 0) {
wsi->state = LWSS_AWAITING_CLOSE_ACK;
lws_set_timeout(wsi, PENDING_TIMEOUT_CLOSE_ACK, 1);
lwsl_debug("sent close indication, awaiting ack\n");
goto bail_ok;
}
goto bail_die;
}
/* else, the send failed and we should just hang up */
if ((wsi->state == LWSS_ESTABLISHED &&
wsi->u.ws.ping_pending_flag) ||
(wsi->state == LWSS_RETURNED_CLOSE_ALREADY &&
wsi->u.ws.payload_is_close)) {
if (wsi->u.ws.payload_is_close)
write_type = LWS_WRITE_CLOSE;
n = lws_write(wsi, &wsi->u.ws.ping_payload_buf[LWS_PRE],
wsi->u.ws.ping_payload_len, write_type);
if (n < 0)
goto bail_die;
/* well he is sent, mark him done */
wsi->u.ws.ping_pending_flag = 0;
if (wsi->u.ws.payload_is_close)
/* oh... a close frame was it... then we are done */
goto bail_die;
/* otherwise for PING, leave POLLOUT active either way */
goto bail_ok;
}
if (wsi->state == LWSS_ESTABLISHED &&
!wsi->socket_is_permanently_unusable &&
wsi->u.ws.send_check_ping) {
lwsl_info("issuing ping on wsi %p\n", wsi);
wsi->u.ws.send_check_ping = 0;
n = lws_write(wsi, &wsi->u.ws.ping_payload_buf[LWS_PRE],
0, LWS_WRITE_PING);
if (n < 0)
goto bail_die;
/*
* we apparently were able to send the PING in a reasonable time
* now reset the clock on our peer to be able to send the
* PONG in a reasonable time.
*/
lws_set_timeout(wsi, PENDING_TIMEOUT_WS_PONG_CHECK_GET_PONG,
wsi->context->timeout_secs);
goto bail_ok;
}
/* Priority 4: if we are closing, not allowed to send more data frags
* which means user callback or tx ext flush banned now
*/
if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY)
goto user_service;
/* Priority 5: Tx path extension with more to send
*
* These are handled as new fragments each time around
* So while we must block new writeable callback to enforce
* payload ordering, but since they are always complete
* fragments control packets can interleave OK.
*/
if (wsi->state == LWSS_ESTABLISHED && wsi->u.ws.tx_draining_ext) {
lwsl_ext("SERVICING TX EXT DRAINING\n");
if (lws_write(wsi, NULL, 0, LWS_WRITE_CONTINUATION) < 0)
goto bail_die;
/* leave POLLOUT active */
goto bail_ok;
}
/* Priority 6: user can get the callback
*/
m = lws_ext_cb_active(wsi, LWS_EXT_CB_IS_WRITEABLE, NULL, 0);
if (m)
goto bail_die;
#ifndef LWS_NO_EXTENSIONS
if (!wsi->extension_data_pending)
goto user_service;
#endif
/*
* check in on the active extensions, see if they
* had pending stuff to spill... they need to get the
* first look-in otherwise sequence will be disordered
*
* NULL, zero-length eff_buf means just spill pending
*/
ret = 1;
if (wsi->mode == LWSCM_RAW || wsi->mode == LWSCM_RAW_FILEDESC)
ret = 0;
while (ret == 1) {
/* default to nobody has more to spill */
ret = 0;
eff_buf.token = NULL;
eff_buf.token_len = 0;
/* give every extension a chance to spill */
m = lws_ext_cb_active(wsi,
LWS_EXT_CB_PACKET_TX_PRESEND,
&eff_buf, 0);
if (m < 0) {
lwsl_err("ext reports fatal error\n");
goto bail_die;
}
if (m)
/*
* at least one extension told us he has more
* to spill, so we will go around again after
*/
ret = 1;
/* assuming they gave us something to send, send it */
if (eff_buf.token_len) {
n = lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
eff_buf.token_len);
if (n < 0) {
lwsl_info("closing from POLLOUT spill\n");
goto bail_die;
}
/*
* Keep amount spilled small to minimize chance of this
*/
if (n != eff_buf.token_len) {
lwsl_err("Unable to spill ext %d vs %d\n",
eff_buf.token_len, n);
goto bail_die;
}
} else
continue;
/* no extension has more to spill */
if (!ret)
continue;
/*
* There's more to spill from an extension, but we just sent
* something... did that leave the pipe choked?
*/
if (!lws_send_pipe_choked(wsi))
/* no we could add more */
continue;
lwsl_info("choked in POLLOUT service\n");
/*
* Yes, he's choked. Leave the POLLOUT masked on so we will
* come back here when he is unchoked. Don't call the user
* callback to enforce ordering of spilling, he'll get called
* when we come back here and there's nothing more to spill.
*/
goto bail_ok;
}
#ifndef LWS_NO_EXTENSIONS
wsi->extension_data_pending = 0;
#endif
user_service:
/* one shot */
if (wsi->parent_carries_io) {
wsi->handling_pollout = 0;
wsi->leave_pollout_active = 0;
return lws_calllback_as_writeable(wsi);
}
if (pollfd) {
int eff = wsi->leave_pollout_active;
if (!eff)
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failed at set pollfd\n");
goto bail_die;
}
wsi->handling_pollout = 0;
/* cannot get leave_pollout_active set after the above */
if (!eff && wsi->leave_pollout_active)
/* got set inbetween sampling eff and clearing
* handling_pollout, force POLLOUT on */
lws_calllback_as_writeable(wsi);
wsi->leave_pollout_active = 0;
}
if (wsi->mode != LWSCM_WSCL_ISSUE_HTTP_BODY &&
!wsi->hdr_parsing_completed)
goto bail_ok;
#ifdef LWS_WITH_CGI
user_service_go_again:
#endif
#ifdef LWS_USE_HTTP2
/*
* we are the 'network wsi' for potentially many muxed child wsi with
* no network connection of their own, who have to use us for all their
* network actions. So we use a round-robin scheme to share out the
* POLLOUT notifications to our children.
*
* But because any child could exhaust the socket's ability to take
* writes, we can only let one child get notified each time.
*
* In addition children may be closed / deleted / added between POLLOUT
* notifications, so we can't hold pointers
*/
if (wsi->mode != LWSCM_HTTP2_SERVING) {
lwsl_info("%s: non http2\n", __func__);
goto notify;
}
wsi->u.http2.requested_POLLOUT = 0;
if (!wsi->u.http2.initialized) {
lwsl_info("pollout on uninitialized http2 conn\n");
goto bail_ok;
}
lwsl_info("%s: doing children\n", __func__);
wsi2 = wsi;
do {
wsi2 = wsi2->u.http2.next_child_wsi;
lwsl_info("%s: child %p\n", __func__, wsi2);
if (!wsi2)
continue;
if (!wsi2->u.http2.requested_POLLOUT)
continue;
wsi2->u.http2.requested_POLLOUT = 0;
if (lws_calllback_as_writeable(wsi2)) {
lwsl_debug("Closing POLLOUT child\n");
lws_close_free_wsi(wsi2, LWS_CLOSE_STATUS_NOSTATUS);
}
wsi2 = wsi;
} while (wsi2 != NULL && !lws_send_pipe_choked(wsi));
lwsl_info("%s: completed\n", __func__);
goto bail_ok;
notify:
#endif
wsi->handling_pollout = 0;
wsi->leave_pollout_active = 0;
return lws_calllback_as_writeable(wsi);
/*
* since these don't disable the POLLOUT, they are always doing the
* right thing for leave_pollout_active whether it was set or not.
*/
bail_ok:
wsi->handling_pollout = 0;
wsi->leave_pollout_active = 0;
return 0;
bail_die:
wsi->handling_pollout = 0;
wsi->leave_pollout_active = 0;
return -1;
}
int
lws_service_timeout_check(struct lws *wsi, unsigned int sec)
{
//#if LWS_POSIX
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
int n = 0;
//#endif
(void)n;
/*
* if extensions want in on it (eg, we are a mux parent)
* give them a chance to service child timeouts
*/
if (lws_ext_cb_active(wsi, LWS_EXT_CB_1HZ, NULL, sec) < 0)
return 0;
if (!wsi->pending_timeout)
return 0;
/*
* if we went beyond the allowed time, kill the
* connection
*/
if ((time_t)sec > wsi->pending_timeout_limit) {
//#if LWS_POSIX
if (wsi->desc.sockfd != LWS_SOCK_INVALID && wsi->position_in_fds_table >= 0)
n = pt->fds[wsi->position_in_fds_table].events;
lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_TIMEOUTS, 1);
/* no need to log normal idle keepalive timeout */
if (wsi->pending_timeout != PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE)
lwsl_notice("wsi %p: TIMEDOUT WAITING on %d (did hdr %d, ah %p, wl %d, pfd events %d) %llu vs %llu\n",
(void *)wsi, wsi->pending_timeout,
wsi->hdr_parsing_completed, wsi->u.hdr.ah,
pt->ah_wait_list_length, n, (unsigned long long)sec, (unsigned long long)wsi->pending_timeout_limit);
//#endif
/*
* Since he failed a timeout, he already had a chance to do
* something and was unable to... that includes situations like
* half closed connections. So process this "failed timeout"
* close as a violent death and don't try to do protocol
* cleanup like flush partials.
*/
wsi->socket_is_permanently_unusable = 1;
if (wsi->mode == LWSCM_WSCL_WAITING_SSL)
wsi->vhost->protocols[0].callback(wsi,
LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
wsi->user_space, (void *)"Timed out waiting SSL", 21);
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 1;
}
return 0;
}
int lws_rxflow_cache(struct lws *wsi, unsigned char *buf, int n, int len)
{
/* his RX is flowcontrolled, don't send remaining now */
if (wsi->rxflow_buffer) {
/* rxflow while we were spilling prev rxflow */
lwsl_info("stalling in existing rxflow buf\n");
return 1;
}
/* a new rxflow, buffer it and warn caller */
lwsl_info("new rxflow input buffer len %d\n", len - n);
wsi->rxflow_buffer = lws_malloc(len - n);
if (!wsi->rxflow_buffer)
return -1;
wsi->rxflow_len = len - n;
wsi->rxflow_pos = 0;
memcpy(wsi->rxflow_buffer, buf + n, len - n);
return 0;
}
/* this is used by the platform service code to stop us waiting for network
* activity in poll() when we have something that already needs service
*/
LWS_VISIBLE LWS_EXTERN int
lws_service_adjust_timeout(struct lws_context *context, int timeout_ms, int tsi)
{
struct lws_context_per_thread *pt = &context->pt[tsi];
int n;
/* Figure out if we really want to wait in poll()
* We only need to wait if really nothing already to do and we have
* to wait for something from network
*/
/* 1) if we know we are draining rx ext, do not wait in poll */
if (pt->rx_draining_ext_list)
return 0;
#ifdef LWS_OPENSSL_SUPPORT
/* 2) if we know we have non-network pending data, do not wait in poll */
if (lws_ssl_anybody_has_buffered_read_tsi(context, tsi)) {
lwsl_info("ssl buffered read\n");
return 0;
}
#endif
/* 3) if any ah has pending rx, do not wait in poll */
for (n = 0; n < context->max_http_header_pool; n++)
if (pt->ah_pool[n].rxpos != pt->ah_pool[n].rxlen) {
/* any ah with pending rx must be attached to someone */
if (!pt->ah_pool[n].wsi) {
lwsl_err("%s: assert: no wsi attached to ah\n", __func__);
assert(0);
}
return 0;
}
return timeout_ms;
}
/*
* guys that need POLLIN service again without waiting for network action
* can force POLLIN here if not flowcontrolled, so they will get service.
*
* Return nonzero if anybody got their POLLIN faked
*/
int
lws_service_flag_pending(struct lws_context *context, int tsi)
{
struct lws_context_per_thread *pt = &context->pt[tsi];
#ifdef LWS_OPENSSL_SUPPORT
struct lws *wsi_next;
#endif
struct lws *wsi;
int forced = 0;
int n;
/* POLLIN faking */
/*
* 1) For all guys with already-available ext data to drain, if they are
* not flowcontrolled, fake their POLLIN status
*/
wsi = pt->rx_draining_ext_list;
while (wsi) {
pt->fds[wsi->position_in_fds_table].revents |=
pt->fds[wsi->position_in_fds_table].events & LWS_POLLIN;
if (pt->fds[wsi->position_in_fds_table].revents & LWS_POLLIN) {
forced = 1;
break;
}
wsi = wsi->u.ws.rx_draining_ext_list;
}
#ifdef LWS_OPENSSL_SUPPORT
/*
* 2) For all guys with buffered SSL read data already saved up, if they
* are not flowcontrolled, fake their POLLIN status so they'll get
* service to use up the buffered incoming data, even though their
* network socket may have nothing
*/
wsi = pt->pending_read_list;
while (wsi) {
wsi_next = wsi->pending_read_list_next;
pt->fds[wsi->position_in_fds_table].revents |=
pt->fds[wsi->position_in_fds_table].events & LWS_POLLIN;
if (pt->fds[wsi->position_in_fds_table].revents & LWS_POLLIN) {
forced = 1;
/*
* he's going to get serviced now, take him off the
* list of guys with buffered SSL. If he still has some
* at the end of the service, he'll get put back on the
* list then.
*/
lws_ssl_remove_wsi_from_buffered_list(wsi);
}
wsi = wsi_next;
}
#endif
/*
* 3) For any wsi who have an ah with pending RX who did not
* complete their current headers, and are not flowcontrolled,
* fake their POLLIN status so they will be able to drain the
* rx buffered in the ah
*/
for (n = 0; n < context->max_http_header_pool; n++)
if (pt->ah_pool[n].rxpos != pt->ah_pool[n].rxlen &&
!pt->ah_pool[n].wsi->hdr_parsing_completed) {
pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].revents |=
pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].events &
LWS_POLLIN;
if (pt->fds[pt->ah_pool[n].wsi->position_in_fds_table].revents &
LWS_POLLIN)
forced = 1;
}
return forced;
}
#ifndef LWS_NO_CLIENT
LWS_VISIBLE int
lws_http_client_read(struct lws *wsi, char **buf, int *len)
{
int rlen, n;
rlen = lws_ssl_capable_read(wsi, (unsigned char *)*buf, *len);
*len = 0;
/* allow the source to signal he has data again next time */
lws_change_pollfd(wsi, 0, LWS_POLLIN);
if (rlen == LWS_SSL_CAPABLE_ERROR) {
lwsl_notice("%s: SSL capable error\n", __func__);
return -1;
}
if (rlen == 0)
return -1;
if (rlen < 0)
return 0;
*len = rlen;
wsi->client_rx_avail = 0;
/*
* server may insist on transfer-encoding: chunked,
* so http client must deal with it
*/
spin_chunks:
while (wsi->chunked && (wsi->chunk_parser != ELCP_CONTENT) && *len) {
switch (wsi->chunk_parser) {
case ELCP_HEX:
if ((*buf)[0] == '\x0d') {
wsi->chunk_parser = ELCP_CR;
break;
}
n = char_to_hex((*buf)[0]);
if (n < 0) {
lwsl_debug("chunking failure\n");
return -1;
}
wsi->chunk_remaining <<= 4;
wsi->chunk_remaining |= n;
break;
case ELCP_CR:
if ((*buf)[0] != '\x0a') {
lwsl_debug("chunking failure\n");
return -1;
}
wsi->chunk_parser = ELCP_CONTENT;
lwsl_info("chunk %d\n", wsi->chunk_remaining);
if (wsi->chunk_remaining)
break;
lwsl_info("final chunk\n");
goto completed;
case ELCP_CONTENT:
break;
case ELCP_POST_CR:
if ((*buf)[0] != '\x0d') {
lwsl_debug("chunking failure\n");
return -1;
}
wsi->chunk_parser = ELCP_POST_LF;
break;
case ELCP_POST_LF:
if ((*buf)[0] != '\x0a')
return -1;
wsi->chunk_parser = ELCP_HEX;
wsi->chunk_remaining = 0;
break;
}
(*buf)++;
(*len)--;
}
if (wsi->chunked && !wsi->chunk_remaining)
return 0;
if (wsi->u.http.content_remain &&
wsi->u.http.content_remain < *len)
n = (int)wsi->u.http.content_remain;
else
n = *len;
if (wsi->chunked && wsi->chunk_remaining &&
wsi->chunk_remaining < n)
n = wsi->chunk_remaining;
#ifdef LWS_WITH_HTTP_PROXY
/* hubbub */
if (wsi->perform_rewrite)
lws_rewrite_parse(wsi->rw, (unsigned char *)*buf, n);
else
#endif
if (user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ,
wsi->user_space, *buf, n)) {
lwsl_debug("%s: LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ returned -1\n", __func__);
return -1;
}
if (wsi->chunked && wsi->chunk_remaining) {
(*buf) += n;
wsi->chunk_remaining -= n;
*len -= n;
}
if (wsi->chunked && !wsi->chunk_remaining)
wsi->chunk_parser = ELCP_POST_CR;
if (wsi->chunked && *len)
goto spin_chunks;
if (wsi->chunked)
return 0;
/* if we know the content length, decrement the content remaining */
if (wsi->u.http.content_length > 0)
wsi->u.http.content_remain -= n;
if (wsi->u.http.content_remain || !wsi->u.http.content_length)
return 0;
completed:
if (user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_COMPLETED_CLIENT_HTTP,
wsi->user_space, NULL, 0)) {
lwsl_debug("Completed call returned -1\n");
return -1;
}
if (lws_http_transaction_completed_client(wsi)) {
lwsl_notice("%s: transaction completed says -1\n", __func__);
return -1;
}
return 0;
}
#endif
static int
lws_is_ws_with_ext(struct lws *wsi)
{
#if defined(LWS_NO_EXTENSIONS)
return 0;
#else
return wsi->state == LWSS_ESTABLISHED &&
!!wsi->count_act_ext;
#endif
}
LWS_VISIBLE int
lws_service_fd_tsi(struct lws_context *context, struct lws_pollfd *pollfd, int tsi)
{
struct lws_context_per_thread *pt = &context->pt[tsi];
lws_sockfd_type our_fd = 0, tmp_fd;
struct lws_tokens eff_buf;
unsigned int pending = 0;
struct lws *wsi, *wsi1;
char draining_flow = 0;
int timed_out = 0;
time_t now;
int n = 0, m;
int more;
if (!context->protocol_init_done)
lws_protocol_init(context);
time(&now);
/*
* handle case that system time was uninitialized when lws started
* at boot, and got initialized a little later
*/
if (context->time_up < 1464083026 && now > 1464083026)
context->time_up = now;
/* TODO: if using libev, we should probably use timeout watchers... */
if (context->last_timeout_check_s != now) {
context->last_timeout_check_s = now;
#if defined(LWS_WITH_STATS)
if (!tsi && now - context->last_dump > 10) {
lws_stats_log_dump(context);
context->last_dump = now;
}
#endif
lws_plat_service_periodic(context);
lws_check_deferred_free(context, 0);
/* retire unused deprecated context */
#if !defined(LWS_PLAT_OPTEE) && !defined(LWS_WITH_ESP32)
#if LWS_POSIX && !defined(_WIN32)
if (context->deprecated && !context->count_wsi_allocated) {
lwsl_notice("%s: ending deprecated context\n", __func__);
kill(getpid(), SIGINT);
return 0;
}
#endif
#endif
/* global timeout check once per second */
if (pollfd)
our_fd = pollfd->fd;
/*
* Phase 1: check every wsi on the timeout check list
*/
wsi = context->pt[tsi].timeout_list;
while (wsi) {
/* we have to take copies, because he may be deleted */
wsi1 = wsi->timeout_list;
tmp_fd = wsi->desc.sockfd;
if (lws_service_timeout_check(wsi, (unsigned int)now)) {
/* he did time out... */
if (tmp_fd == our_fd)
/* it was the guy we came to service! */
timed_out = 1;
/* he's gone, no need to mark as handled */
}
wsi = wsi1;
}
/*
* Phase 2: double-check active ah timeouts independent of wsi
* timeout status
*/
for (n = 0; n < context->max_http_header_pool; n++)
if (pt->ah_pool[n].in_use && pt->ah_pool[n].wsi &&
pt->ah_pool[n].assigned &&
now - pt->ah_pool[n].assigned > 60) {
int len;
char buf[256];
const unsigned char *c;
/*
* a single ah session somehow got held for
* an unreasonable amount of time.
*
* Dump info on the connection...
*/
wsi = pt->ah_pool[n].wsi;
buf[0] = '\0';
lws_get_peer_simple(wsi, buf, sizeof(buf));
lwsl_notice("ah excessive hold: wsi %p\n"
" peer address: %s\n"
" ah rxpos %u, rxlen %u, pos %u\n",
wsi, buf, pt->ah_pool[n].rxpos,
pt->ah_pool[n].rxlen,
pt->ah_pool[n].pos);
m = 0;
do {
c = lws_token_to_string(m);
if (!c)
break;
len = lws_hdr_total_length(wsi, m);
if (!len || len > sizeof(buf) - 1) {
m++;
continue;
}
lws_hdr_copy(wsi, buf, sizeof buf, m);
buf[sizeof(buf) - 1] = '\0';
lwsl_notice(" %s = %s\n",
(const char *)c, buf);
m++;
} while (1);
/* ... and then drop the connection */
if (wsi->desc.sockfd == our_fd)
/* it was the guy we came to service! */
timed_out = 1;
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
}
#ifdef LWS_WITH_CGI
/*
* Phase 3: handle cgi timeouts
*/
lws_cgi_kill_terminated(pt);
#endif
#if 0
{
char s[300], *p = s;
for (n = 0; n < context->count_threads; n++)
p += sprintf(p, " %7lu (%5d), ",
context->pt[n].count_conns,
context->pt[n].fds_count);
lwsl_notice("load: %s\n", s);
}
#endif
}
/*
* at intervals, check for ws connections needing ping-pong checks
*/
if (context->ws_ping_pong_interval &&
context->last_ws_ping_pong_check_s < now + 10) {
struct lws_vhost *vh = context->vhost_list;
context->last_ws_ping_pong_check_s = now;
while (vh) {
for (n = 0; n < vh->count_protocols; n++) {
wsi = vh->same_vh_protocol_list[n];
while (wsi) {
if (wsi->state == LWSS_ESTABLISHED &&
!wsi->socket_is_permanently_unusable &&
!wsi->u.ws.send_check_ping &&
wsi->u.ws.time_next_ping_check &&
wsi->u.ws.time_next_ping_check < now) {
lwsl_info("requesting ping-pong on wsi %p\n", wsi);
wsi->u.ws.send_check_ping = 1;
lws_set_timeout(wsi, PENDING_TIMEOUT_WS_PONG_CHECK_SEND_PING,
context->timeout_secs);
lws_callback_on_writable(wsi);
wsi->u.ws.time_next_ping_check = now +
wsi->context->ws_ping_pong_interval;
}
wsi = wsi->same_vh_protocol_next;
}
}
vh = vh->vhost_next;
}
}
/* the socket we came to service timed out, nothing to do */
if (timed_out)
return 0;
/* just here for timeout management? */
if (!pollfd)
return 0;
/* no, here to service a socket descriptor */
wsi = wsi_from_fd(context, pollfd->fd);
if (!wsi)
/* not lws connection ... leave revents alone and return */
return 0;
/*
* so that caller can tell we handled, past here we need to
* zero down pollfd->revents after handling
*/
#if LWS_POSIX
/* handle session socket closed */
if ((!(pollfd->revents & pollfd->events & LWS_POLLIN)) &&
(pollfd->revents & LWS_POLLHUP)) {
wsi->socket_is_permanently_unusable = 1;
lwsl_debug("Session Socket %p (fd=%d) dead\n",
(void *)wsi, pollfd->fd);
goto close_and_handled;
}
#ifdef _WIN32
if (pollfd->revents & LWS_POLLOUT)
wsi->sock_send_blocking = FALSE;
#endif
#endif
// lwsl_debug("fd=%d, revents=%d, mode=%d, state=%d\n", pollfd->fd, pollfd->revents, (int)wsi->mode, (int)wsi->state);
if ((!(pollfd->revents & pollfd->events & LWS_POLLIN)) &&
(pollfd->revents & LWS_POLLHUP)) {
lwsl_debug("pollhup\n");
wsi->socket_is_permanently_unusable = 1;
goto close_and_handled;
}
#ifdef LWS_OPENSSL_SUPPORT
if ((wsi->state == LWSS_SHUTDOWN) && lws_is_ssl(wsi) && wsi->ssl)
{
n = SSL_shutdown(wsi->ssl);
lwsl_debug("SSL_shutdown=%d for fd %d\n", n, wsi->desc.sockfd);
if (n == 1)
{
n = shutdown(wsi->desc.sockfd, SHUT_WR);
goto close_and_handled;
}
else if (n == 0)
{
lws_change_pollfd(wsi, LWS_POLLOUT, LWS_POLLIN);
n = 0;
goto handled;
}
else /* n < 0 */
{
int shutdown_error = SSL_get_error(wsi->ssl, n);
lwsl_debug("SSL_shutdown returned %d, SSL_get_error: %d\n", n, shutdown_error);
if (shutdown_error == SSL_ERROR_WANT_READ) {
lws_change_pollfd(wsi, LWS_POLLOUT, LWS_POLLIN);
n = 0;
goto handled;
} else if (shutdown_error == SSL_ERROR_WANT_WRITE) {
lws_change_pollfd(wsi, LWS_POLLOUT, LWS_POLLOUT);
n = 0;
goto handled;
}
// actual error occurred, just close the connection
n = shutdown(wsi->desc.sockfd, SHUT_WR);
goto close_and_handled;
}
}
#endif
/* okay, what we came here to do... */
switch (wsi->mode) {
case LWSCM_HTTP_SERVING:
case LWSCM_HTTP_CLIENT:
case LWSCM_HTTP_SERVING_ACCEPTED:
case LWSCM_SERVER_LISTENER:
case LWSCM_SSL_ACK_PENDING:
case LWSCM_SSL_ACK_PENDING_RAW:
if (wsi->state == LWSS_CLIENT_HTTP_ESTABLISHED)
goto handled;
#ifdef LWS_WITH_CGI
if (wsi->cgi && (pollfd->revents & LWS_POLLOUT)) {
n = lws_handle_POLLOUT_event(wsi, pollfd);
if (n)
goto close_and_handled;
goto handled;
}
#endif
/* fallthru */
case LWSCM_RAW:
n = lws_server_socket_service(context, wsi, pollfd);
if (n) /* closed by above */
return 1;
goto handled;
case LWSCM_RAW_FILEDESC:
if (pollfd->revents & LWS_POLLOUT) {
n = lws_calllback_as_writeable(wsi);
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failed at set pollfd\n");
return 1;
}
if (n)
goto close_and_handled;
}
n = LWS_CALLBACK_RAW_RX;
if (wsi->mode == LWSCM_RAW_FILEDESC)
n = LWS_CALLBACK_RAW_RX_FILE;
if (pollfd->revents & LWS_POLLIN) {
if (user_callback_handle_rxflow(
wsi->protocol->callback,
wsi, n,
wsi->user_space, NULL, 0)) {
lwsl_debug("raw rx callback closed it\n");
goto close_and_handled;
}
}
if (pollfd->revents & LWS_POLLHUP)
goto close_and_handled;
n = 0;
goto handled;
case LWSCM_WS_SERVING:
case LWSCM_WS_CLIENT:
case LWSCM_HTTP2_SERVING:
case LWSCM_HTTP_CLIENT_ACCEPTED:
/* 1: something requested a callback when it was OK to write */
if (wsi->state == LWSS_WAITING_TO_SEND_CLOSE_NOTIFICATION)
lwsl_notice("xxx\n");
if ((pollfd->revents & LWS_POLLOUT) &&
((wsi->state == LWSS_ESTABLISHED ||
wsi->state == LWSS_HTTP2_ESTABLISHED ||
wsi->state == LWSS_HTTP2_ESTABLISHED_PRE_SETTINGS ||
wsi->state == LWSS_RETURNED_CLOSE_ALREADY ||
wsi->state == LWSS_WAITING_TO_SEND_CLOSE_NOTIFICATION ||
wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE)) &&
lws_handle_POLLOUT_event(wsi, pollfd)) {
if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY)
wsi->state = LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE;
lwsl_info("lws_service_fd: closing\n");
goto close_and_handled;
}
if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY ||
wsi->state == LWSS_WAITING_TO_SEND_CLOSE_NOTIFICATION ||
wsi->state == LWSS_AWAITING_CLOSE_ACK) {
/*
* we stopped caring about anything except control
* packets. Force flow control off, defeat tx
* draining.
*/
lws_rx_flow_control(wsi, 1);
wsi->u.ws.tx_draining_ext = 0;
}
if (wsi->u.ws.tx_draining_ext)
/* we cannot deal with new RX until the TX ext
* path has been drained. It's because new
* rx will, eg, crap on the wsi rx buf that
* may be needed to retain state.
*
* TX ext drain path MUST go through event loop
* to avoid blocking.
*/
break;
if (!(wsi->rxflow_change_to & LWS_RXFLOW_ALLOW))
/* We cannot deal with any kind of new RX
* because we are RX-flowcontrolled.
*/
break;
/* 2: RX Extension needs to be drained
*/
if (wsi->state == LWSS_ESTABLISHED &&
wsi->u.ws.rx_draining_ext) {
lwsl_ext("%s: RX EXT DRAINING: Service\n", __func__);
#ifndef LWS_NO_CLIENT
if (wsi->mode == LWSCM_WS_CLIENT) {
n = lws_client_rx_sm(wsi, 0);
if (n < 0)
/* we closed wsi */
n = 0;
} else
#endif
n = lws_rx_sm(wsi, 0);
goto handled;
}
if (wsi->u.ws.rx_draining_ext)
/*
* We have RX EXT content to drain, but can't do it
* right now. That means we cannot do anything lower
* priority either.
*/
break;
/* 3: RX Flowcontrol buffer needs to be drained
*/
if (wsi->rxflow_buffer) {
lwsl_info("draining rxflow (len %d)\n",
wsi->rxflow_len - wsi->rxflow_pos
);
/* well, drain it */
eff_buf.token = (char *)wsi->rxflow_buffer +
wsi->rxflow_pos;
eff_buf.token_len = wsi->rxflow_len - wsi->rxflow_pos;
draining_flow = 1;
goto drain;
}
/* 4: any incoming (or ah-stashed incoming rx) data ready?
* notice if rx flow going off raced poll(), rx flow wins
*/
if (!(pollfd->revents & pollfd->events & LWS_POLLIN))
break;
read:
/* all the union members start with hdr, so even in ws mode
* we can deal with the ah via u.hdr
*/
if (wsi->u.hdr.ah) {
lwsl_info("%s: %p: inherited ah rx\n", __func__, wsi);
eff_buf.token_len = wsi->u.hdr.ah->rxlen -
wsi->u.hdr.ah->rxpos;
eff_buf.token = (char *)wsi->u.hdr.ah->rx +
wsi->u.hdr.ah->rxpos;
} else {
if (wsi->mode != LWSCM_HTTP_CLIENT_ACCEPTED) {
/*
* extension may not consume everything (eg, pmd may be constrained
* as to what it can output...) has to go in per-wsi rx buf area.
* Otherwise in large temp serv_buf area.
*/
eff_buf.token = (char *)pt->serv_buf;
if (lws_is_ws_with_ext(wsi)) {
eff_buf.token_len = wsi->u.ws.rx_ubuf_alloc;
} else {
eff_buf.token_len = context->pt_serv_buf_size;
}
if ((unsigned int)eff_buf.token_len > context->pt_serv_buf_size)
eff_buf.token_len = context->pt_serv_buf_size;
eff_buf.token_len = lws_ssl_capable_read(wsi,
(unsigned char *)eff_buf.token, pending ? pending :
eff_buf.token_len);
switch (eff_buf.token_len) {
case 0:
lwsl_info("%s: zero length read\n", __func__);
goto close_and_handled;
case LWS_SSL_CAPABLE_MORE_SERVICE:
lwsl_info("SSL Capable more service\n");
n = 0;
goto handled;
case LWS_SSL_CAPABLE_ERROR:
lwsl_info("Closing when error\n");
goto close_and_handled;
}
// lwsl_notice("Actual RX %d\n", eff_buf.token_len);
}
}
drain:
#ifndef LWS_NO_CLIENT
if (wsi->mode == LWSCM_HTTP_CLIENT_ACCEPTED &&
!wsi->told_user_closed) {
/*
* In SSL mode we get POLLIN notification about
* encrypted data in.
*
* But that is not necessarily related to decrypted
* data out becoming available; in may need to perform
* other in or out before that happens.
*
* simply mark ourselves as having readable data
* and turn off our POLLIN
*/
wsi->client_rx_avail = 1;
lws_change_pollfd(wsi, LWS_POLLIN, 0);
/* let user code know, he'll usually ask for writeable
* callback and drain / re-enable it there
*/
if (user_callback_handle_rxflow(
wsi->protocol->callback,
wsi, LWS_CALLBACK_RECEIVE_CLIENT_HTTP,
wsi->user_space, NULL, 0)) {
lwsl_notice("LWS_CALLBACK_RECEIVE_CLIENT_HTTP closed it\n");
goto close_and_handled;
}
n = 0;
goto handled;
}
#endif
/*
* give any active extensions a chance to munge the buffer
* before parse. We pass in a pointer to an lws_tokens struct
* prepared with the default buffer and content length that's in
* there. Rather than rewrite the default buffer, extensions
* that expect to grow the buffer can adapt .token to
* point to their own per-connection buffer in the extension
* user allocation. By default with no extensions or no
* extension callback handling, just the normal input buffer is
* used then so it is efficient.
*/
do {
more = 0;
m = lws_ext_cb_active(wsi, LWS_EXT_CB_PACKET_RX_PREPARSE,
&eff_buf, 0);
if (m < 0)
goto close_and_handled;
if (m)
more = 1;
/* service incoming data */
if (eff_buf.token_len) {
/*
* if draining from rxflow buffer, not
* critical to track what was used since at the
* use it bumps wsi->rxflow_pos. If we come
* around again it will pick up from where it
* left off.
*/
// lwsl_notice("doing lws_read from pt->serv_buf %p %p for len %d\n", pt->serv_buf, eff_buf.token, (int)eff_buf.token_len);
n = lws_read(wsi, (unsigned char *)eff_buf.token,
eff_buf.token_len);
if (n < 0) {
/* we closed wsi */
n = 0;
goto handled;
}
}
eff_buf.token = NULL;
eff_buf.token_len = 0;
} while (more);
if (wsi->u.hdr.ah) {
lwsl_notice("%s: %p: detaching\n",
__func__, wsi);
lws_header_table_force_to_detachable_state(wsi);
/* we can run the normal ah detach flow despite
* being in ws union mode, since all union members
* start with hdr */
lws_header_table_detach(wsi, 0);
}
pending = lws_ssl_pending(wsi);
if (pending) {
if (lws_is_ws_with_ext(wsi))
pending = pending > wsi->u.ws.rx_ubuf_alloc ?
wsi->u.ws.rx_ubuf_alloc : pending;
else
pending = pending > context->pt_serv_buf_size ?
context->pt_serv_buf_size : pending;
goto read;
}
if (draining_flow && wsi->rxflow_buffer &&
wsi->rxflow_pos == wsi->rxflow_len) {
lwsl_info("flow buffer: drained\n");
lws_free_set_NULL(wsi->rxflow_buffer);
/* having drained the rxflow buffer, can rearm POLLIN */
#ifdef LWS_NO_SERVER
n =
#endif
_lws_rx_flow_control(wsi);
/* n ignored, needed for NO_SERVER case */
}
break;
#ifdef LWS_WITH_CGI
case LWSCM_CGI: /* we exist to handle a cgi's stdin/out/err data...
* do the callback on our master wsi
*/
{
struct lws_cgi_args args;
if (wsi->cgi_channel >= LWS_STDOUT &&
!(pollfd->revents & pollfd->events & LWS_POLLIN))
break;
if (wsi->cgi_channel == LWS_STDIN &&
!(pollfd->revents & pollfd->events & LWS_POLLOUT))
break;
if (wsi->cgi_channel == LWS_STDIN)
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failed at set pollfd\n");
return 1;
}
args.ch = wsi->cgi_channel;
args.stdwsi = &wsi->parent->cgi->stdwsi[0];
args.hdr_state = wsi->hdr_state;
//lwsl_err("CGI LWS_STDOUT waiting wsi %p mode %d state %d\n",
// wsi->parent, wsi->parent->mode, wsi->parent->state);
if (user_callback_handle_rxflow(
wsi->parent->protocol->callback,
wsi->parent, LWS_CALLBACK_CGI,
wsi->parent->user_space,
(void *)&args, 0))
return 1;
break;
}
#endif
default:
#ifdef LWS_NO_CLIENT
break;
#else
if ((pollfd->revents & LWS_POLLOUT) &&
lws_handle_POLLOUT_event(wsi, pollfd)) {
lwsl_debug("POLLOUT event closed it\n");
goto close_and_handled;
}
n = lws_client_socket_service(context, wsi, pollfd);
if (n)
return 1;
goto handled;
#endif
}
n = 0;
goto handled;
close_and_handled:
lwsl_debug("%p: Close and handled\n", wsi);
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
/*
* pollfd may point to something else after the close
* due to pollfd swapping scheme on delete on some platforms
* we can't clear revents now because it'd be the wrong guy's revents
*/
return 1;
handled:
pollfd->revents = 0;
return n;
}
LWS_VISIBLE int
lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd)
{
return lws_service_fd_tsi(context, pollfd, 0);
}
LWS_VISIBLE int
lws_service(struct lws_context *context, int timeout_ms)
{
return lws_plat_service(context, timeout_ms);
}
LWS_VISIBLE int
lws_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
{
return _lws_plat_service_tsi(context, timeout_ms, tsi);
}
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