2 * libwebsockets - small server side websockets and web server implementation
4 * Copyright (C) 2010-2014 Andy Green <andy@warmcat.com>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation:
9 * version 2.1 of the License.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
22 #include "private-libwebsockets.h"
24 int log_level = LLL_ERR | LLL_WARN | LLL_NOTICE;
25 static void (*lwsl_emit)(int level, const char *line) = lwsl_emit_stderr;
27 static const char * const log_level_names[] = {
41 libwebsocket_close_and_free_session(struct libwebsocket_context *context,
42 struct libwebsocket *wsi, enum lws_close_status reason)
46 unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 2 +
47 LWS_SEND_BUFFER_POST_PADDING];
48 struct lws_tokens eff_buf;
53 old_state = wsi->state;
55 if (wsi->socket_is_permanently_unusable ||
56 reason == LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY)
57 goto just_kill_connection;
60 case WSI_STATE_DEAD_SOCKET:
63 /* we tried the polite way... */
64 case WSI_STATE_AWAITING_CLOSE_ACK:
65 goto just_kill_connection;
67 case WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE:
68 if (wsi->truncated_send_len) {
69 libwebsocket_callback_on_writable(context, wsi);
72 lwsl_info("wsi %p completed WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE\n", wsi);
73 goto just_kill_connection;
75 if (wsi->truncated_send_len) {
76 lwsl_info("wsi %p entering WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE\n", wsi);
77 wsi->state = WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE;
78 libwebsocket_set_timeout(wsi, PENDING_FLUSH_STORED_SEND_BEFORE_CLOSE, 5);
84 wsi->u.ws.close_reason = reason;
86 if (wsi->mode == LWS_CONNMODE_WS_CLIENT_WAITING_CONNECT ||
87 wsi->mode == LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE) {
89 context->protocols[0].callback(context, wsi,
90 LWS_CALLBACK_CLIENT_CONNECTION_ERROR, wsi->user_space, NULL, 0);
92 lws_free_header_table(wsi);
93 goto just_kill_connection;
96 if (wsi->mode == LWS_CONNMODE_HTTP_SERVING)
97 context->protocols[0].callback(context, wsi,
98 LWS_CALLBACK_CLOSED_HTTP, wsi->user_space, NULL, 0);
100 if (wsi->mode == LWS_CONNMODE_HTTP_SERVING_ACCEPTED) {
101 if (wsi->u.http.fd != LWS_INVALID_FILE) {
102 lwsl_debug("closing http file\n");
103 compatible_file_close(wsi->u.http.fd);
104 wsi->u.http.fd = LWS_INVALID_FILE;
105 context->protocols[0].callback(context, wsi,
106 LWS_CALLBACK_CLOSED_HTTP, wsi->user_space, NULL, 0);
111 * are his extensions okay with him closing? Eg he might be a mux
112 * parent and just his ch1 aspect is closing?
115 if (lws_ext_callback_for_each_active(wsi,
116 LWS_EXT_CALLBACK_CHECK_OK_TO_REALLY_CLOSE, NULL, 0) > 0) {
117 lwsl_ext("extension vetoed close\n");
122 * flush any tx pending from extensions, since we may send close packet
123 * if there are problems with send, just nuke the connection
128 eff_buf.token = NULL;
129 eff_buf.token_len = 0;
131 /* show every extension the new incoming data */
133 m = lws_ext_callback_for_each_active(wsi,
134 LWS_EXT_CALLBACK_FLUSH_PENDING_TX, &eff_buf, 0);
136 lwsl_ext("Extension reports fatal error\n");
137 goto just_kill_connection;
141 * at least one extension told us he has more
142 * to spill, so we will go around again after
146 /* assuming they left us something to send, send it */
148 if (eff_buf.token_len)
149 if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
150 eff_buf.token_len) != eff_buf.token_len) {
151 lwsl_debug("close: ext spill failed\n");
152 goto just_kill_connection;
157 * signal we are closing, libwebsocket_write will
158 * add any necessary version-specific stuff. If the write fails,
159 * no worries we are closing anyway. If we didn't initiate this
160 * close, then our state has been changed to
161 * WSI_STATE_RETURNED_CLOSE_ALREADY and we will skip this.
163 * Likewise if it's a second call to close this connection after we
164 * sent the close indication to the peer already, we are in state
165 * WSI_STATE_AWAITING_CLOSE_ACK and will skip doing this a second time.
168 if (old_state == WSI_STATE_ESTABLISHED &&
169 reason != LWS_CLOSE_STATUS_NOSTATUS &&
170 reason != LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY) {
172 lwsl_debug("sending close indication...\n");
174 /* make valgrind happy */
175 memset(buf, 0, sizeof(buf));
176 n = libwebsocket_write(wsi,
177 &buf[LWS_SEND_BUFFER_PRE_PADDING + 2],
181 * we have sent a nice protocol level indication we
182 * now wish to close, we should not send anything more
185 wsi->state = WSI_STATE_AWAITING_CLOSE_ACK;
188 * ...and we should wait for a reply for a bit
192 libwebsocket_set_timeout(wsi,
193 PENDING_TIMEOUT_CLOSE_ACK, 1);
195 lwsl_debug("sent close indication, awaiting ack\n");
200 lwsl_info("close: sending close packet failed, hanging up\n");
202 /* else, the send failed and we should just hang up */
205 just_kill_connection:
207 lwsl_debug("close: just_kill_connection\n");
210 * we won't be servicing or receiving anything further from this guy
211 * delete socket from the internal poll list if still present
214 lws_ssl_remove_wsi_from_buffered_list(context, wsi);
216 remove_wsi_socket_from_fds(context, wsi);
218 wsi->state = WSI_STATE_DEAD_SOCKET;
220 lws_free2(wsi->rxflow_buffer);
222 if (wsi->mode == LWS_CONNMODE_HTTP2_SERVING && wsi->u.hdr.ah) {
223 lws_free2(wsi->u.hdr.ah);
226 if ((old_state == WSI_STATE_ESTABLISHED ||
227 wsi->mode == LWS_CONNMODE_WS_SERVING ||
228 wsi->mode == LWS_CONNMODE_WS_CLIENT)) {
230 lws_free2(wsi->u.ws.rx_user_buffer);
232 if (wsi->truncated_send_malloc) {
233 /* not going to be completed... nuke it */
234 lws_free2(wsi->truncated_send_malloc);
235 wsi->truncated_send_len = 0;
237 if (wsi->u.ws.ping_payload_buf) {
238 lws_free2(wsi->u.ws.ping_payload_buf);
239 wsi->u.ws.ping_payload_alloc = 0;
240 wsi->u.ws.ping_payload_len = 0;
241 wsi->u.ws.ping_pending_flag = 0;
245 /* tell the user it's all over for this guy */
247 if (wsi->protocol && wsi->protocol->callback &&
248 ((old_state == WSI_STATE_ESTABLISHED) ||
249 (old_state == WSI_STATE_RETURNED_CLOSE_ALREADY) ||
250 (old_state == WSI_STATE_AWAITING_CLOSE_ACK) ||
251 (old_state == WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE))) {
252 lwsl_debug("calling back CLOSED\n");
253 wsi->protocol->callback(context, wsi, LWS_CALLBACK_CLOSED,
254 wsi->user_space, NULL, 0);
255 } else if (wsi->mode == LWS_CONNMODE_HTTP_SERVING_ACCEPTED) {
256 lwsl_debug("calling back CLOSED_HTTP\n");
257 context->protocols[0].callback(context, wsi,
258 LWS_CALLBACK_CLOSED_HTTP, wsi->user_space, NULL, 0 );
259 } else if (wsi->mode == LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY) {
260 lwsl_debug("Connection closed before server reply\n");
261 context->protocols[0].callback(context, wsi,
262 LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
263 wsi->user_space, NULL, 0 );
265 lwsl_debug("not calling back closed mode=%d state=%d\n",
266 wsi->mode, old_state);
268 /* deallocate any active extension contexts */
270 if (lws_ext_callback_for_each_active(wsi, LWS_EXT_CALLBACK_DESTROY, NULL, 0) < 0)
271 lwsl_warn("extension destruction failed\n");
272 #ifndef LWS_NO_EXTENSIONS
273 for (n = 0; n < wsi->count_active_extensions; n++)
274 lws_free(wsi->active_extensions_user[n]);
277 * inform all extensions in case they tracked this guy out of band
278 * even though not active on him specifically
280 if (lws_ext_callback_for_each_extension_type(context, wsi,
281 LWS_EXT_CALLBACK_DESTROY_ANY_WSI_CLOSING, NULL, 0) < 0)
282 lwsl_warn("ext destroy wsi failed\n");
284 /* lwsl_info("closing fd=%d\n", wsi->sock); */
286 if (!lws_ssl_close(wsi) && wsi->sock >= 0) {
287 n = shutdown(wsi->sock, SHUT_RDWR);
289 lwsl_debug("closing: shutdown ret %d\n", LWS_ERRNO);
291 n = compatible_close(wsi->sock);
293 lwsl_debug("closing: close ret %d\n", LWS_ERRNO);
296 /* outermost destroy notification for wsi (user_space still intact) */
297 context->protocols[0].callback(context, wsi,
298 LWS_CALLBACK_WSI_DESTROY, wsi->user_space, NULL, 0);
300 if (wsi->protocol && wsi->protocol->per_session_data_size &&
301 wsi->user_space && !wsi->user_space_externally_allocated)
302 lws_free(wsi->user_space);
304 /* As a precaution, free the header table in case it lingered: */
305 lws_free_header_table(wsi);
310 libwebsockets_get_addresses(struct libwebsocket_context *context,
311 void *ads, char *name, int name_len,
312 char *rip, int rip_len)
314 struct addrinfo ai, *res;
321 if (LWS_IPV6_ENABLED(context)) {
322 if (!lws_plat_inet_ntop(AF_INET6, &((struct sockaddr_in6 *)ads)->sin6_addr, rip, rip_len)) {
323 lwsl_err("inet_ntop", strerror(LWS_ERRNO));
327 // Strip off the IPv4 to IPv6 header if one exists
328 if (strncmp(rip, "::ffff:", 7) == 0)
329 memmove(rip, rip + 7, strlen(rip) - 6);
331 getnameinfo((struct sockaddr *)ads,
332 sizeof(struct sockaddr_in6), name,
333 name_len, NULL, 0, 0);
339 memset(&ai, 0, sizeof ai);
340 ai.ai_family = PF_UNSPEC;
341 ai.ai_socktype = SOCK_STREAM;
342 ai.ai_flags = AI_CANONNAME;
344 if (getnameinfo((struct sockaddr *)ads,
345 sizeof(struct sockaddr_in),
346 name, name_len, NULL, 0, 0))
352 if (getaddrinfo(name, NULL, &ai, &res))
356 switch (res->ai_family) {
358 p = &((struct sockaddr_in *)res->ai_addr)->sin_addr;
369 lws_plat_inet_ntop(AF_INET, p, rip, rip_len);
375 * libwebsockets_get_peer_addresses() - Get client address information
376 * @context: Libwebsockets context
377 * @wsi: Local struct libwebsocket associated with
378 * @fd: Connection socket descriptor
379 * @name: Buffer to take client address name
380 * @name_len: Length of client address name buffer
381 * @rip: Buffer to take client address IP dotted quad
382 * @rip_len: Length of client address IP buffer
384 * This function fills in @name and @rip with the name and IP of
385 * the client connected with socket descriptor @fd. Names may be
386 * truncated if there is not enough room. If either cannot be
387 * determined, they will be returned as valid zero-length strings.
391 libwebsockets_get_peer_addresses(struct libwebsocket_context *context,
392 struct libwebsocket *wsi, int fd, char *name, int name_len,
393 char *rip, int rip_len)
397 struct sockaddr_in6 sin6;
399 struct sockaddr_in sin4;
406 lws_latency_pre(context, wsi);
409 if (LWS_IPV6_ENABLED(context)) {
419 if (getpeername(fd, p, &len) < 0) {
420 lwsl_warn("getpeername: %s\n", strerror(LWS_ERRNO));
424 ret = libwebsockets_get_addresses(context, p, name, name_len, rip, rip_len);
427 lws_latency(context, wsi, "libwebsockets_get_peer_addresses", ret, 1);
431 * libwebsocket_context_user() - get the user data associated with the context
432 * @context: Websocket context
434 * This returns the optional user allocation that can be attached to
435 * the context the sockets live in at context_create time. It's a way
436 * to let all sockets serviced in the same context share data without
437 * using globals statics in the user code.
440 libwebsocket_context_user(struct libwebsocket_context *context)
442 return context->user_space;
447 * libwebsocket_callback_all_protocol() - Callback all connections using
448 * the given protocol with the given reason
450 * @protocol: Protocol whose connections will get callbacks
451 * @reason: Callback reason index
455 libwebsocket_callback_all_protocol(
456 const struct libwebsocket_protocols *protocol, int reason)
458 struct libwebsocket_context *context = protocol->owning_server;
460 struct libwebsocket *wsi;
462 for (n = 0; n < context->fds_count; n++) {
463 wsi = wsi_from_fd(context, context->fds[n].fd);
466 if (wsi->protocol == protocol)
467 protocol->callback(context, wsi,
468 reason, wsi->user_space, NULL, 0);
475 * libwebsocket_set_timeout() - marks the wsi as subject to a timeout
477 * You will not need this unless you are doing something special
479 * @wsi: Websocket connection instance
480 * @reason: timeout reason
481 * @secs: how many seconds
485 libwebsocket_set_timeout(struct libwebsocket *wsi,
486 enum pending_timeout reason, int secs)
492 wsi->pending_timeout_limit = now + secs;
493 wsi->pending_timeout = reason;
498 * libwebsocket_get_socket_fd() - returns the socket file descriptor
500 * You will not need this unless you are doing something special
502 * @wsi: Websocket connection instance
506 libwebsocket_get_socket_fd(struct libwebsocket *wsi)
513 lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi,
514 const char *action, int ret, int completed)
516 unsigned long long u;
519 u = time_in_microseconds();
522 wsi->latency_start = u;
523 if (!wsi->action_start)
524 wsi->action_start = u;
528 if (wsi->action_start == wsi->latency_start)
530 "Completion first try lat %lluus: %p: ret %d: %s\n",
531 u - wsi->latency_start,
532 (void *)wsi, ret, action);
535 "Completion %lluus: lat %lluus: %p: ret %d: %s\n",
536 u - wsi->action_start,
537 u - wsi->latency_start,
538 (void *)wsi, ret, action);
539 wsi->action_start = 0;
541 sprintf(buf, "lat %lluus: %p: ret %d: %s\n",
542 u - wsi->latency_start, (void *)wsi, ret, action);
544 if (u - wsi->latency_start > context->worst_latency) {
545 context->worst_latency = u - wsi->latency_start;
546 strcpy(context->worst_latency_info, buf);
548 lwsl_latency("%s", buf);
555 * libwebsocket_rx_flow_control() - Enable and disable socket servicing for
558 * If the output side of a server process becomes choked, this allows flow
559 * control for the input side.
561 * @wsi: Websocket connection instance to get callback for
562 * @enable: 0 = disable read servicing for this connection, 1 = enable
566 libwebsocket_rx_flow_control(struct libwebsocket *wsi, int enable)
568 if (enable == (wsi->rxflow_change_to & LWS_RXFLOW_ALLOW))
571 lwsl_info("libwebsocket_rx_flow_control(0x%p, %d)\n", wsi, enable);
572 wsi->rxflow_change_to = LWS_RXFLOW_PENDING_CHANGE | !!enable;
578 * libwebsocket_rx_flow_allow_all_protocol() - Allow all connections with this protocol to receive
580 * When the user server code realizes it can accept more input, it can
581 * call this to have the RX flow restriction removed from all connections using
582 * the given protocol.
584 * @protocol: all connections using this protocol will be allowed to receive
588 libwebsocket_rx_flow_allow_all_protocol(
589 const struct libwebsocket_protocols *protocol)
591 struct libwebsocket_context *context = protocol->owning_server;
593 struct libwebsocket *wsi;
595 for (n = 0; n < context->fds_count; n++) {
596 wsi = wsi_from_fd(context, context->fds[n].fd);
599 if (wsi->protocol == protocol)
600 libwebsocket_rx_flow_control(wsi, LWS_RXFLOW_ALLOW);
606 * libwebsocket_canonical_hostname() - returns this host's hostname
608 * This is typically used by client code to fill in the host parameter
609 * when making a client connection. You can only call it after the context
612 * @context: Websocket context
614 LWS_VISIBLE extern const char *
615 libwebsocket_canonical_hostname(struct libwebsocket_context *context)
617 return (const char *)context->canonical_hostname;
620 int user_callback_handle_rxflow(callback_function callback_function,
621 struct libwebsocket_context *context,
622 struct libwebsocket *wsi,
623 enum libwebsocket_callback_reasons reason, void *user,
624 void *in, size_t len)
628 n = callback_function(context, wsi, reason, user, in, len);
630 n = _libwebsocket_rx_flow_control(wsi);
637 * libwebsocket_set_proxy() - Setups proxy to libwebsocket_context.
638 * @context: pointer to struct libwebsocket_context you want set proxy to
639 * @proxy: pointer to c string containing proxy in format address:port
641 * Returns 0 if proxy string was parsed and proxy was setup.
642 * Returns -1 if @proxy is NULL or has incorrect format.
644 * This is only required if your OS does not provide the http_proxy
645 * environment variable (eg, OSX)
647 * IMPORTANT! You should call this function right after creation of the
648 * libwebsocket_context and before call to connect. If you call this
649 * function after connect behavior is undefined.
650 * This function will override proxy settings made on libwebsocket_context
651 * creation with genenv() call.
655 libwebsocket_set_proxy(struct libwebsocket_context *context, const char *proxy)
662 strncpy(context->http_proxy_address, proxy,
663 sizeof(context->http_proxy_address) - 1);
664 context->http_proxy_address[
665 sizeof(context->http_proxy_address) - 1] = '\0';
667 p = strchr(context->http_proxy_address, ':');
669 lwsl_err("http_proxy needs to be ads:port\n");
674 context->http_proxy_port = atoi(p + 1);
676 lwsl_notice(" Proxy %s:%u\n", context->http_proxy_address,
677 context->http_proxy_port);
683 * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket
685 * @wsi: pointer to struct websocket you want to know the protocol of
688 * Some apis can act on all live connections of a given protocol,
689 * this is how you can get a pointer to the active protocol if needed.
692 LWS_VISIBLE const struct libwebsocket_protocols *
693 libwebsockets_get_protocol(struct libwebsocket *wsi)
695 return wsi->protocol;
699 libwebsocket_is_final_fragment(struct libwebsocket *wsi)
701 return wsi->u.ws.final;
704 LWS_VISIBLE unsigned char
705 libwebsocket_get_reserved_bits(struct libwebsocket *wsi)
707 return wsi->u.ws.rsv;
711 libwebsocket_ensure_user_space(struct libwebsocket *wsi)
713 lwsl_info("%s: %p protocol %p\n", __func__, wsi, wsi->protocol);
717 /* allocate the per-connection user memory (if any) */
719 if (wsi->protocol->per_session_data_size && !wsi->user_space) {
720 wsi->user_space = lws_zalloc(wsi->protocol->per_session_data_size);
721 if (wsi->user_space == NULL) {
722 lwsl_err("Out of memory for conn user space\n");
726 lwsl_info("%s: %p protocol pss %u, user_space=%d\n", __func__, wsi, wsi->protocol->per_session_data_size, wsi->user_space);
730 LWS_VISIBLE void lwsl_emit_stderr(int level, const char *line)
733 unsigned long long now;
737 for (n = 0; n < LLL_COUNT; n++)
738 if (level == (1 << n)) {
739 now = time_in_microseconds() / 100;
740 sprintf(buf, "[%llu:%04d] %s: ", (unsigned long long) now / 10000,
741 (int)(now % 10000), log_level_names[n]);
745 fprintf(stderr, "%s%s", buf, line);
749 LWS_VISIBLE void _lws_logv(int filter, const char *format, va_list vl)
753 if (!(log_level & filter))
756 vsnprintf(buf, sizeof(buf), format, vl);
757 buf[sizeof(buf) - 1] = '\0';
759 lwsl_emit(filter, buf);
762 LWS_VISIBLE void _lws_log(int filter, const char *format, ...)
766 va_start(ap, format);
767 _lws_logv(filter, format, ap);
772 * lws_set_log_level() - Set the logging bitfield
773 * @level: OR together the LLL_ debug contexts you want output from
774 * @log_emit_function: NULL to leave it as it is, or a user-supplied
775 * function to perform log string emission instead of
776 * the default stderr one.
778 * log level defaults to "err", "warn" and "notice" contexts enabled and
779 * emission on stderr.
782 LWS_VISIBLE void lws_set_log_level(int level, void (*log_emit_function)(int level,
786 if (log_emit_function)
787 lwsl_emit = log_emit_function;
791 * lws_use_ssl() - Find out if connection is using SSL
792 * @wsi: websocket connection to check
794 * Returns 0 if the connection is not using SSL, 1 if using SSL and
795 * using verified cert, and 2 if using SSL but the cert was not
796 * checked (appears for client wsi told to skip check on connection)
799 lws_is_ssl(struct libwebsocket *wsi)
801 #ifdef LWS_OPENSSL_SUPPORT
809 * lws_partial_buffered() - find out if lws buffered the last write
810 * @wsi: websocket connection to check
812 * Returns 1 if you cannot use libwebsocket_write because the last
813 * write on this connection is still buffered, and can't be cleared without
814 * returning to the service loop and waiting for the connection to be
817 * If you will try to do >1 libwebsocket_write call inside a single
818 * WRITEABLE callback, you must check this after every write and bail if
819 * set, ask for a new writeable callback and continue writing from there.
821 * This is never set at the start of a writeable callback, but any write
826 lws_partial_buffered(struct libwebsocket *wsi)
828 return !!wsi->truncated_send_len;
831 void lws_set_protocol_write_pending(struct libwebsocket_context *context,
832 struct libwebsocket *wsi,
833 enum lws_pending_protocol_send pend)
835 lwsl_info("setting pps %d\n", pend);
838 lwsl_err("pps overwrite\n");
840 libwebsocket_rx_flow_control(wsi, 0);
841 libwebsocket_callback_on_writable(context, wsi);
845 lws_get_peer_write_allowance(struct libwebsocket *wsi)
848 /* only if we are using HTTP2 on this connection */
849 if (wsi->mode != LWS_CONNMODE_HTTP2_SERVING)
851 /* user is only interested in how much he can send, or that he can't */
852 if (wsi->u.http2.tx_credit <= 0)
855 return wsi->u.http2.tx_credit;
862 lws_union_transition(struct libwebsocket *wsi, enum connection_mode mode)
864 memset(&wsi->u, 0, sizeof(wsi->u));