void
lws_cgi_remove_and_kill(struct lws *wsi)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
struct lws_cgi **pcgi = &pt->http.cgi_list;
/* remove us from the cgi list */
lwsl_debug("%s: remove cgi %p from list\n", __func__, wsi->http.cgi);
while (*pcgi) {
if (*pcgi == wsi->http.cgi) {
/* drop us from the pt cgi list */
*pcgi = (*pcgi)->cgi_list;
break;
}
pcgi = &(*pcgi)->cgi_list;
}
if (wsi->http.cgi->headers_buf) {
lwsl_debug("close: freed cgi headers\n");
lws_free_set_NULL(wsi->http.cgi->headers_buf);
}
/* we have a cgi going, we must kill it */
wsi->http.cgi->being_closed = 1;
lws_cgi_kill(wsi);
}
void
lws_close_free_wsi(struct lws *wsi, enum lws_close_status reason)
{
struct lws_context_per_thread *pt;
struct lws **pwsi, *wsi1, *wsi2;
struct lws_context *context;
struct lws_tokens eff_buf;
int n, m, ret;
if (!wsi)
return;
context = wsi->context;
pt = &context->pt[(int)wsi->tsi];
/* if we have children, close them first */
if (wsi->child_list) {
wsi2 = wsi->child_list;
while (wsi2) {
//lwsl_notice("%s: closing %p: close child %p\n",
// __func__, wsi, wsi2);
wsi1 = wsi2->sibling_list;
//lwsl_notice("%s: closing %p: next sibling %p\n",
// __func__, wsi2, wsi1);
wsi2->parent = NULL;
/* stop it doing shutdown processing */
wsi2->socket_is_permanently_unusable = 1;
lws_close_free_wsi(wsi2, reason);
wsi2 = wsi1;
}
wsi->child_list = NULL;
}
#ifdef LWS_WITH_CGI
if (wsi->mode == LWSCM_CGI) {
/* we are not a network connection, but a handler for CGI io */
if (wsi->parent && wsi->parent->cgi)
/* end the binding between us and master */
wsi->parent->cgi->stdwsi[(int)wsi->cgi_channel] = NULL;
wsi->socket_is_permanently_unusable = 1;
goto just_kill_connection;
}
if (wsi->cgi) {
/* we have a cgi going, we must kill it */
wsi->cgi->being_closed = 1;
lws_cgi_kill(wsi);
}
#endif
if (wsi->mode == LWSCM_HTTP_SERVING_ACCEPTED &&
wsi->u.http.fd != LWS_INVALID_FILE) {
lws_plat_file_close(wsi, wsi->u.http.fd);
wsi->u.http.fd = LWS_INVALID_FILE;
context->protocols[0].callback(wsi, LWS_CALLBACK_CLOSED_HTTP,
wsi->user_space, NULL, 0);
}
if (wsi->socket_is_permanently_unusable ||
reason == LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY ||
wsi->state == LWSS_SHUTDOWN)
goto just_kill_connection;
wsi->state_pre_close = wsi->state;
switch (wsi->state_pre_close) {
case LWSS_DEAD_SOCKET:
return;
/* we tried the polite way... */
case LWSS_AWAITING_CLOSE_ACK:
goto just_kill_connection;
case LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE:
if (wsi->trunc_len) {
lws_callback_on_writable(wsi);
return;
}
lwsl_info("wsi %p completed LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE\n", wsi);
goto just_kill_connection;
default:
if (wsi->trunc_len) {
lwsl_info("wsi %p entering LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE\n", wsi);
wsi->state = LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE;
lws_set_timeout(wsi, PENDING_FLUSH_STORED_SEND_BEFORE_CLOSE, 5);
return;
}
break;
}
if (wsi->mode == LWSCM_WSCL_WAITING_CONNECT ||
wsi->mode == LWSCM_WSCL_ISSUE_HANDSHAKE)
goto just_kill_connection;
if (wsi->mode == LWSCM_HTTP_SERVING)
context->protocols[0].callback(wsi, LWS_CALLBACK_CLOSED_HTTP,
wsi->user_space, NULL, 0);
if (wsi->mode == LWSCM_HTTP_CLIENT)
context->protocols[0].callback(wsi, LWS_CALLBACK_CLOSED_CLIENT_HTTP,
wsi->user_space, NULL, 0);
/*
* are his extensions okay with him closing? Eg he might be a mux
* parent and just his ch1 aspect is closing?
*/
if (lws_ext_cb_active(wsi,
LWS_EXT_CB_CHECK_OK_TO_REALLY_CLOSE, NULL, 0) > 0) {
lwsl_ext("extension vetoed close\n");
return;
}
/*
* flush any tx pending from extensions, since we may send close packet
* if there are problems with send, just nuke the connection
*/
do {
ret = 0;
eff_buf.token = NULL;
eff_buf.token_len = 0;
/* show every extension the new incoming data */
m = lws_ext_cb_active(wsi,
LWS_EXT_CB_FLUSH_PENDING_TX, &eff_buf, 0);
if (m < 0) {
lwsl_ext("Extension reports fatal error\n");
goto just_kill_connection;
}
if (m)
/*
* at least one extension told us he has more
* to spill, so we will go around again after
*/
ret = 1;
/* assuming they left us something to send, send it */
if (eff_buf.token_len)
if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
eff_buf.token_len) !=
eff_buf.token_len) {
lwsl_debug("close: ext spill failed\n");
goto just_kill_connection;
}
} while (ret);
/*
* signal we are closing, lws_write will
* add any necessary version-specific stuff. If the write fails,
* no worries we are closing anyway. If we didn't initiate this
* close, then our state has been changed to
* LWSS_RETURNED_CLOSE_ALREADY and we will skip this.
*
* Likewise if it's a second call to close this connection after we
* sent the close indication to the peer already, we are in state
* LWSS_AWAITING_CLOSE_ACK and will skip doing this a second time.
*/
if (wsi->state_pre_close == LWSS_ESTABLISHED &&
(wsi->u.ws.close_in_ping_buffer_len || /* already a reason */
(reason != LWS_CLOSE_STATUS_NOSTATUS &&
(reason != LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY)))) {
lwsl_debug("sending close indication...\n");
/* if no prepared close reason, use 1000 and no aux data */
if (!wsi->u.ws.close_in_ping_buffer_len) {
wsi->u.ws.close_in_ping_buffer_len = 2;
wsi->u.ws.ping_payload_buf[LWS_PRE] =
(reason >> 16) & 0xff;
wsi->u.ws.ping_payload_buf[LWS_PRE + 1] =
reason & 0xff;
}
LWS_EXTERN int
lws_cgi_kill_terminated(struct lws_context_per_thread *pt)
{
struct lws_cgi **pcgi, *cgi = NULL;
int status, n = 1;
while (n > 0) {
/* find finished guys but don't reap yet */
n = waitpid(-1, &status, WNOHANG);
if (n <= 0)
continue;
lwsl_debug("%s: observed PID %d terminated\n", __func__, n);
pcgi = &pt->http.cgi_list;
/* check all the subprocesses on the cgi list */
while (*pcgi) {
/* get the next one first as list may change */
cgi = *pcgi;
pcgi = &(*pcgi)->cgi_list;
if (cgi->pid <= 0)
continue;
/* finish sending cached headers */
if (cgi->headers_buf)
continue;
/* wait for stdout to be drained */
if (cgi->content_length > cgi->content_length_seen)
continue;
if (cgi->content_length) {
lwsl_debug("%s: wsi %p: expected content "
"length seen: %lld\n", __func__,
cgi->wsi,
(unsigned long long)cgi->content_length_seen);
}
/* reap it */
waitpid(n, &status, WNOHANG);
/*
* he's already terminated so no need for kill()
* but we should do the terminated cgi callback
* and close him if he's not already closing
*/
if (n == cgi->pid) {
lwsl_debug("%s: found PID %d on cgi list\n",
__func__, n);
if (!cgi->content_length) {
/*
* well, if he sends chunked...
* give him 2s after the
* cgi terminated to send buffered
*/
cgi->chunked_grace++;
continue;
}
/* defeat kill() */
cgi->pid = 0;
lws_cgi_kill(cgi->wsi);
break;
}
cgi = NULL;
}
/* if not found on the cgi list, as he's one of ours, reap */
if (!cgi) {
lwsl_debug("%s: reading PID %d although no cgi match\n",
__func__, n);
waitpid(n, &status, WNOHANG);
}
}
pcgi = &pt->http.cgi_list;
/* check all the subprocesses on the cgi list */
while (*pcgi) {
/* get the next one first as list may change */
cgi = *pcgi;
pcgi = &(*pcgi)->cgi_list;
if (cgi->pid <= 0)
continue;
/* we deferred killing him after reaping his PID */
if (cgi->chunked_grace) {
cgi->chunked_grace++;
if (cgi->chunked_grace < 2)
continue;
goto finish_him;
}
/* finish sending cached headers */
if (cgi->headers_buf)
continue;
/* wait for stdout to be drained */
if (cgi->content_length > cgi->content_length_seen)
continue;
if (cgi->content_length)
lwsl_debug("%s: wsi %p: expected "
"content len seen: %lld\n", __func__,
cgi->wsi,
(unsigned long long)cgi->content_length_seen);
/* reap it */
if (waitpid(cgi->pid, &status, WNOHANG) > 0) {
if (!cgi->content_length) {
/*
* well, if he sends chunked...
* give him 2s after the
* cgi terminated to send buffered
*/
cgi->chunked_grace++;
continue;
}
finish_him:
lwsl_debug("%s: found PID %d on cgi list\n",
__func__, cgi->pid);
/* defeat kill() */
cgi->pid = 0;
lws_cgi_kill(cgi->wsi);
break;
}
}
return 0;
}
