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[] = {
42 libwebsocket_close_and_free_session(struct libwebsocket_context *context,
43 struct libwebsocket *wsi, enum lws_close_status reason)
47 unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 2 +
48 LWS_SEND_BUFFER_POST_PADDING];
49 struct lws_tokens eff_buf;
54 old_state = wsi->state;
56 if (wsi->socket_is_permanently_unusable)
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;
83 wsi->u.ws.close_reason = reason;
85 if (wsi->mode == LWS_CONNMODE_WS_CLIENT_WAITING_CONNECT ||
86 wsi->mode == LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE) {
88 context->protocols[0].callback(context, wsi,
89 LWS_CALLBACK_CLIENT_CONNECTION_ERROR, wsi->user_space, NULL, 0);
91 lws_free_header_table(wsi);
92 goto just_kill_connection;
95 if (wsi->mode == LWS_CONNMODE_HTTP_SERVING_ACCEPTED) {
96 if (wsi->u.http.fd != LWS_INVALID_FILE) {
97 lwsl_debug("closing http file\n");
98 compatible_file_close(wsi->u.http.fd);
99 wsi->u.http.fd = LWS_INVALID_FILE;
100 context->protocols[0].callback(context, wsi,
101 LWS_CALLBACK_CLOSED_HTTP, wsi->user_space, NULL, 0);
106 * are his extensions okay with him closing? Eg he might be a mux
107 * parent and just his ch1 aspect is closing?
110 if (lws_ext_callback_for_each_active(wsi,
111 LWS_EXT_CALLBACK_CHECK_OK_TO_REALLY_CLOSE, NULL, 0) > 0) {
112 lwsl_ext("extension vetoed close\n");
117 * flush any tx pending from extensions, since we may send close packet
118 * if there are problems with send, just nuke the connection
123 eff_buf.token = NULL;
124 eff_buf.token_len = 0;
126 /* show every extension the new incoming data */
128 m = lws_ext_callback_for_each_active(wsi,
129 LWS_EXT_CALLBACK_FLUSH_PENDING_TX, &eff_buf, 0);
131 lwsl_ext("Extension reports fatal error\n");
132 goto just_kill_connection;
136 * at least one extension told us he has more
137 * to spill, so we will go around again after
141 /* assuming they left us something to send, send it */
143 if (eff_buf.token_len)
144 if (lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
145 eff_buf.token_len) != eff_buf.token_len) {
146 lwsl_debug("close: ext spill failed\n");
147 goto just_kill_connection;
152 * signal we are closing, libwebsocket_write will
153 * add any necessary version-specific stuff. If the write fails,
154 * no worries we are closing anyway. If we didn't initiate this
155 * close, then our state has been changed to
156 * WSI_STATE_RETURNED_CLOSE_ALREADY and we will skip this.
158 * Likewise if it's a second call to close this connection after we
159 * sent the close indication to the peer already, we are in state
160 * WSI_STATE_AWAITING_CLOSE_ACK and will skip doing this a second time.
163 if (old_state == WSI_STATE_ESTABLISHED &&
164 reason != LWS_CLOSE_STATUS_NOSTATUS) {
166 lwsl_debug("sending close indication...\n");
168 /* make valgrind happy */
169 memset(buf, 0, sizeof(buf));
170 n = libwebsocket_write(wsi,
171 &buf[LWS_SEND_BUFFER_PRE_PADDING + 2],
175 * we have sent a nice protocol level indication we
176 * now wish to close, we should not send anything more
179 wsi->state = WSI_STATE_AWAITING_CLOSE_ACK;
182 * ...and we should wait for a reply for a bit
186 libwebsocket_set_timeout(wsi,
187 PENDING_TIMEOUT_CLOSE_ACK, 1);
189 lwsl_debug("sent close indication, awaiting ack\n");
194 lwsl_info("close: sending close packet failed, hanging up\n");
196 /* else, the send failed and we should just hang up */
199 just_kill_connection:
201 lwsl_debug("close: just_kill_connection\n");
204 * we won't be servicing or receiving anything further from this guy
205 * delete socket from the internal poll list if still present
208 remove_wsi_socket_from_fds(context, wsi);
210 wsi->state = WSI_STATE_DEAD_SOCKET;
212 lws_free2(wsi->rxflow_buffer);
214 if (wsi->mode == LWS_CONNMODE_HTTP2_SERVING && wsi->u.hdr.ah) {
215 lws_free2(wsi->u.hdr.ah);
218 if ((old_state == WSI_STATE_ESTABLISHED ||
219 wsi->mode == LWS_CONNMODE_WS_SERVING ||
220 wsi->mode == LWS_CONNMODE_WS_CLIENT)) {
222 lws_free2(wsi->u.ws.rx_user_buffer);
224 if (wsi->truncated_send_malloc) {
225 /* not going to be completed... nuke it */
226 lws_free2(wsi->truncated_send_malloc);
227 wsi->truncated_send_len = 0;
229 if (wsi->u.ws.ping_payload_buf) {
230 lws_free2(wsi->u.ws.ping_payload_buf);
231 wsi->u.ws.ping_payload_alloc = 0;
232 wsi->u.ws.ping_payload_len = 0;
236 /* tell the user it's all over for this guy */
238 if (wsi->protocol && wsi->protocol->callback &&
239 ((old_state == WSI_STATE_ESTABLISHED) ||
240 (old_state == WSI_STATE_RETURNED_CLOSE_ALREADY) ||
241 (old_state == WSI_STATE_AWAITING_CLOSE_ACK) ||
242 (old_state == WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE))) {
243 lwsl_debug("calling back CLOSED\n");
244 wsi->protocol->callback(context, wsi, LWS_CALLBACK_CLOSED,
245 wsi->user_space, NULL, 0);
246 } else if (wsi->mode == LWS_CONNMODE_HTTP_SERVING_ACCEPTED) {
247 lwsl_debug("calling back CLOSED_HTTP\n");
248 context->protocols[0].callback(context, wsi,
249 LWS_CALLBACK_CLOSED_HTTP, wsi->user_space, NULL, 0 );
251 lwsl_debug("not calling back closed\n");
253 /* deallocate any active extension contexts */
255 if (lws_ext_callback_for_each_active(wsi, LWS_EXT_CALLBACK_DESTROY, NULL, 0) < 0)
256 lwsl_warn("extension destruction failed\n");
257 #ifndef LWS_NO_EXTENSIONS
258 for (n = 0; n < wsi->count_active_extensions; n++)
259 lws_free(wsi->active_extensions_user[n]);
262 * inform all extensions in case they tracked this guy out of band
263 * even though not active on him specifically
265 if (lws_ext_callback_for_each_extension_type(context, wsi,
266 LWS_EXT_CALLBACK_DESTROY_ANY_WSI_CLOSING, NULL, 0) < 0)
267 lwsl_warn("ext destroy wsi failed\n");
269 /* lwsl_info("closing fd=%d\n", wsi->sock); */
271 if (!lws_ssl_close(wsi) && wsi->sock >= 0) {
272 n = shutdown(wsi->sock, SHUT_RDWR);
274 lwsl_debug("closing: shutdown ret %d\n", LWS_ERRNO);
276 n = compatible_close(wsi->sock);
278 lwsl_debug("closing: close ret %d\n", LWS_ERRNO);
281 /* outermost destroy notification for wsi (user_space still intact) */
282 context->protocols[0].callback(context, wsi,
283 LWS_CALLBACK_WSI_DESTROY, wsi->user_space, NULL, 0);
285 if (wsi->protocol && wsi->protocol->per_session_data_size &&
286 wsi->user_space && !wsi->user_space_externally_allocated)
287 lws_free(wsi->user_space);
289 /* As a precaution, free the header table in case it lingered: */
290 lws_free_header_table(wsi);
295 * libwebsockets_get_peer_addresses() - Get client address information
296 * @context: Libwebsockets context
297 * @wsi: Local struct libwebsocket associated with
298 * @fd: Connection socket descriptor
299 * @name: Buffer to take client address name
300 * @name_len: Length of client address name buffer
301 * @rip: Buffer to take client address IP dotted quad
302 * @rip_len: Length of client address IP buffer
304 * This function fills in @name and @rip with the name and IP of
305 * the client connected with socket descriptor @fd. Names may be
306 * truncated if there is not enough room. If either cannot be
307 * determined, they will be returned as valid zero-length strings.
311 libwebsockets_get_peer_addresses(struct libwebsocket_context *context,
312 struct libwebsocket *wsi, int fd, char *name, int name_len,
313 char *rip, int rip_len)
317 struct sockaddr_in6 sin6;
319 struct sockaddr_in sin4;
320 struct hostent *host;
321 struct hostent *host1;
326 struct sockaddr_un *un;
333 lws_latency_pre(context, wsi);
336 if (LWS_IPV6_ENABLED(context)) {
339 if (getpeername(fd, (struct sockaddr *) &sin6, &len) < 0) {
340 lwsl_warn("getpeername: %s\n", strerror(LWS_ERRNO));
344 if (!lws_plat_inet_ntop(AF_INET6, &sin6.sin6_addr, rip, rip_len)) {
345 lwsl_err("inet_ntop", strerror(LWS_ERRNO));
349 // Strip off the IPv4 to IPv6 header if one exists
350 if (strncmp(rip, "::ffff:", 7) == 0)
351 memmove(rip, rip + 7, strlen(rip) - 6);
353 getnameinfo((struct sockaddr *)&sin6,
354 sizeof(struct sockaddr_in6), name,
355 name_len, NULL, 0, 0);
361 if (getpeername(fd, (struct sockaddr *) &sin4, &len) < 0) {
362 lwsl_warn("getpeername: %s\n", strerror(LWS_ERRNO));
365 host = gethostbyaddr((char *) &sin4.sin_addr,
366 sizeof(sin4.sin_addr), AF_INET);
368 lwsl_warn("gethostbyaddr: %s\n", strerror(LWS_ERRNO));
372 strncpy(name, host->h_name, name_len);
373 name[name_len - 1] = '\0';
375 host1 = gethostbyname(host->h_name);
378 p = (unsigned char *)host1;
381 p = (unsigned char *)host1->h_addr_list[n++];
384 if ((host1->h_addrtype != AF_INET)
386 && (host1->h_addrtype != AF_LOCAL)
391 if (host1->h_addrtype == AF_INET)
392 sprintf(ip, "%u.%u.%u.%u",
393 p[0], p[1], p[2], p[3]);
396 un = (struct sockaddr_un *)p;
397 strncpy(ip, un->sun_path, sizeof(ip) - 1);
398 ip[sizeof(ip) - 1] = '\0';
402 strncpy(rip, ip, rip_len);
403 rip[rip_len - 1] = '\0';
409 lws_latency(context, wsi, "libwebsockets_get_peer_addresses", ret, 1);
415 * libwebsocket_context_user() - get the user data associated with the context
416 * @context: Websocket context
418 * This returns the optional user allocation that can be attached to
419 * the context the sockets live in at context_create time. It's a way
420 * to let all sockets serviced in the same context share data without
421 * using globals statics in the user code.
424 libwebsocket_context_user(struct libwebsocket_context *context)
426 return context->user_space;
431 * libwebsocket_callback_all_protocol() - Callback all connections using
432 * the given protocol with the given reason
434 * @protocol: Protocol whose connections will get callbacks
435 * @reason: Callback reason index
439 libwebsocket_callback_all_protocol(
440 const struct libwebsocket_protocols *protocol, int reason)
442 struct libwebsocket_context *context = protocol->owning_server;
444 struct libwebsocket *wsi;
446 for (n = 0; n < context->fds_count; n++) {
447 wsi = context->lws_lookup[context->fds[n].fd];
450 if (wsi->protocol == protocol)
451 protocol->callback(context, wsi,
452 reason, wsi->user_space, NULL, 0);
459 * libwebsocket_set_timeout() - marks the wsi as subject to a timeout
461 * You will not need this unless you are doing something special
463 * @wsi: Websocket connection instance
464 * @reason: timeout reason
465 * @secs: how many seconds
469 libwebsocket_set_timeout(struct libwebsocket *wsi,
470 enum pending_timeout reason, int secs)
476 wsi->pending_timeout_limit = now + secs;
477 wsi->pending_timeout = reason;
482 * libwebsocket_get_socket_fd() - returns the socket file descriptor
484 * You will not need this unless you are doing something special
486 * @wsi: Websocket connection instance
490 libwebsocket_get_socket_fd(struct libwebsocket *wsi)
497 lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi,
498 const char *action, int ret, int completed)
500 unsigned long long u;
503 u = time_in_microseconds();
506 wsi->latency_start = u;
507 if (!wsi->action_start)
508 wsi->action_start = u;
512 if (wsi->action_start == wsi->latency_start)
514 "Completion first try lat %lluus: %p: ret %d: %s\n",
515 u - wsi->latency_start,
516 (void *)wsi, ret, action);
519 "Completion %lluus: lat %lluus: %p: ret %d: %s\n",
520 u - wsi->action_start,
521 u - wsi->latency_start,
522 (void *)wsi, ret, action);
523 wsi->action_start = 0;
525 sprintf(buf, "lat %lluus: %p: ret %d: %s\n",
526 u - wsi->latency_start, (void *)wsi, ret, action);
528 if (u - wsi->latency_start > context->worst_latency) {
529 context->worst_latency = u - wsi->latency_start;
530 strcpy(context->worst_latency_info, buf);
532 lwsl_latency("%s", buf);
539 * libwebsocket_rx_flow_control() - Enable and disable socket servicing for
542 * If the output side of a server process becomes choked, this allows flow
543 * control for the input side.
545 * @wsi: Websocket connection instance to get callback for
546 * @enable: 0 = disable read servicing for this connection, 1 = enable
550 libwebsocket_rx_flow_control(struct libwebsocket *wsi, int enable)
552 if (enable == (wsi->rxflow_change_to & LWS_RXFLOW_ALLOW))
555 lwsl_info("libwebsocket_rx_flow_control(0x%p, %d)\n", wsi, enable);
556 wsi->rxflow_change_to = LWS_RXFLOW_PENDING_CHANGE | !!enable;
562 * libwebsocket_rx_flow_allow_all_protocol() - Allow all connections with this protocol to receive
564 * When the user server code realizes it can accept more input, it can
565 * call this to have the RX flow restriction removed from all connections using
566 * the given protocol.
568 * @protocol: all connections using this protocol will be allowed to receive
572 libwebsocket_rx_flow_allow_all_protocol(
573 const struct libwebsocket_protocols *protocol)
575 struct libwebsocket_context *context = protocol->owning_server;
577 struct libwebsocket *wsi;
579 for (n = 0; n < context->fds_count; n++) {
580 wsi = context->lws_lookup[context->fds[n].fd];
583 if (wsi->protocol == protocol)
584 libwebsocket_rx_flow_control(wsi, LWS_RXFLOW_ALLOW);
590 * libwebsocket_canonical_hostname() - returns this host's hostname
592 * This is typically used by client code to fill in the host parameter
593 * when making a client connection. You can only call it after the context
596 * @context: Websocket context
598 LWS_VISIBLE extern const char *
599 libwebsocket_canonical_hostname(struct libwebsocket_context *context)
601 return (const char *)context->canonical_hostname;
604 int user_callback_handle_rxflow(callback_function callback_function,
605 struct libwebsocket_context *context,
606 struct libwebsocket *wsi,
607 enum libwebsocket_callback_reasons reason, void *user,
608 void *in, size_t len)
612 n = callback_function(context, wsi, reason, user, in, len);
614 n = _libwebsocket_rx_flow_control(wsi);
621 * libwebsocket_set_proxy() - Setups proxy to libwebsocket_context.
622 * @context: pointer to struct libwebsocket_context you want set proxy to
623 * @proxy: pointer to c string containing proxy in format address:port
625 * Returns 0 if proxy string was parsed and proxy was setup.
626 * Returns -1 if @proxy is NULL or has incorrect format.
628 * This is only required if your OS does not provide the http_proxy
629 * environment variable (eg, OSX)
631 * IMPORTANT! You should call this function right after creation of the
632 * libwebsocket_context and before call to connect. If you call this
633 * function after connect behavior is undefined.
634 * This function will override proxy settings made on libwebsocket_context
635 * creation with genenv() call.
639 libwebsocket_set_proxy(struct libwebsocket_context *context, const char *proxy)
646 strncpy(context->http_proxy_address, proxy,
647 sizeof(context->http_proxy_address) - 1);
648 context->http_proxy_address[
649 sizeof(context->http_proxy_address) - 1] = '\0';
651 p = strchr(context->http_proxy_address, ':');
653 lwsl_err("http_proxy needs to be ads:port\n");
658 context->http_proxy_port = atoi(p + 1);
660 lwsl_notice(" Proxy %s:%u\n", context->http_proxy_address,
661 context->http_proxy_port);
667 * libwebsockets_get_protocol() - Returns a protocol pointer from a websocket
669 * @wsi: pointer to struct websocket you want to know the protocol of
672 * Some apis can act on all live connections of a given protocol,
673 * this is how you can get a pointer to the active protocol if needed.
676 LWS_VISIBLE const struct libwebsocket_protocols *
677 libwebsockets_get_protocol(struct libwebsocket *wsi)
679 return wsi->protocol;
683 libwebsocket_is_final_fragment(struct libwebsocket *wsi)
685 return wsi->u.ws.final;
688 LWS_VISIBLE unsigned char
689 libwebsocket_get_reserved_bits(struct libwebsocket *wsi)
691 return wsi->u.ws.rsv;
695 libwebsocket_ensure_user_space(struct libwebsocket *wsi)
697 lwsl_info("%s: %p protocol %p\n", __func__, wsi, wsi->protocol);
701 /* allocate the per-connection user memory (if any) */
703 if (wsi->protocol->per_session_data_size && !wsi->user_space) {
704 wsi->user_space = lws_zalloc(wsi->protocol->per_session_data_size);
705 if (wsi->user_space == NULL) {
706 lwsl_err("Out of memory for conn user space\n");
710 lwsl_info("%s: %p protocol pss %u, user_space=%d\n", __func__, wsi, wsi->protocol->per_session_data_size, wsi->user_space);
714 LWS_VISIBLE void lwsl_emit_stderr(int level, const char *line)
717 unsigned long long now;
721 for (n = 0; n < LLL_COUNT; n++)
722 if (level == (1 << n)) {
723 now = time_in_microseconds() / 100;
724 sprintf(buf, "[%lu:%04d] %s: ", (unsigned long) now / 10000,
725 (int)(now % 10000), log_level_names[n]);
729 fprintf(stderr, "%s%s", buf, line);
733 LWS_VISIBLE void _lws_log(int filter, const char *format, ...)
738 if (!(log_level & filter))
741 va_start(ap, format);
742 vsnprintf(buf, sizeof(buf), format, ap);
743 buf[sizeof(buf) - 1] = '\0';
746 lwsl_emit(filter, buf);
750 * lws_set_log_level() - Set the logging bitfield
751 * @level: OR together the LLL_ debug contexts you want output from
752 * @log_emit_function: NULL to leave it as it is, or a user-supplied
753 * function to perform log string emission instead of
754 * the default stderr one.
756 * log level defaults to "err", "warn" and "notice" contexts enabled and
757 * emission on stderr.
760 LWS_VISIBLE void lws_set_log_level(int level, void (*log_emit_function)(int level,
764 if (log_emit_function)
765 lwsl_emit = log_emit_function;
769 * lws_use_ssl() - Find out if connection is using SSL
770 * @wsi: websocket connection to check
772 * Returns 0 if the connection is not using SSL, 1 if using SSL and
773 * using verified cert, and 2 if using SSL but the cert was not
774 * checked (appears for client wsi told to skip check on connection)
777 lws_is_ssl(struct libwebsocket *wsi)
779 #ifdef LWS_OPENSSL_SUPPORT
787 * lws_partial_buffered() - find out if lws buffered the last write
788 * @wsi: websocket connection to check
790 * Returns 1 if you cannot use libwebsocket_write because the last
791 * write on this connection is still buffered, and can't be cleared without
792 * returning to the service loop and waiting for the connection to be
795 * If you will try to do >1 libwebsocket_write call inside a single
796 * WRITEABLE callback, you must check this after every write and bail if
797 * set, ask for a new writeable callback and continue writing from there.
799 * This is never set at the start of a writeable callback, but any write
804 lws_partial_buffered(struct libwebsocket *wsi)
806 return !!wsi->truncated_send_len;
809 void lws_set_protocol_write_pending(struct libwebsocket_context *context,
810 struct libwebsocket *wsi,
811 enum lws_pending_protocol_send pend)
813 lwsl_info("setting pps %d\n", pend);
816 lwsl_err("pps overwrite\n");
818 libwebsocket_rx_flow_control(wsi, 0);
819 libwebsocket_callback_on_writable(context, wsi);
823 lws_get_peer_write_allowance(struct libwebsocket *wsi)
826 /* only if we are using HTTP2 on this connection */
827 if (wsi->mode != LWS_CONNMODE_HTTP2_SERVING)
829 /* user is only interested in how much he can send, or that he can't */
830 if (wsi->u.http2.tx_credit <= 0)
833 return wsi->u.http2.tx_credit;
840 lws_union_transition(struct libwebsocket *wsi, enum connection_mode mode)
842 memset(&wsi->u, 0, sizeof(wsi->u));