2 * libwebsockets - small server side websockets and web server implementation
4 * Copyright (C) 2010-2016 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 #ifndef LIBWEBSOCKET_H_3060898B846849FF9F88F5DB59B5950C
23 #define LIBWEBSOCKET_H_3060898B846849FF9F88F5DB59B5950C
29 #include "mbed-drivers/mbed.h"
30 #include "sal-iface-eth/EthernetInterface.h"
31 #include "sockets/TCPListener.h"
32 #include "sal-stack-lwip/lwipv4_init.h"
36 using namespace mbed::Sockets::v0;
48 awaiting_on_writeable(0)
53 void set_wsi(struct lws *_wsi) { wsi = _wsi; }
54 int actual_onRX(Socket *s);
56 void onError(Socket *s, socket_error_t err);
57 void onDisconnect(TCPStream *s);
58 void onSent(Socket *s, uint16_t len);
59 void serialized_writeable(struct lws *wsi);
67 char awaiting_on_writeable;
70 class lws_conn_listener : lws_conn {
73 srv(SOCKET_STACK_LWIP_IPV4)
75 srv.setOnError(TCPStream::ErrorHandler_t(this,
76 &lws_conn_listener::onError));
79 void start(const uint16_t port);
83 void onError(Socket *s, socket_error_t err);
84 void onIncoming(TCPListener *s, void *impl);
85 void onDisconnect(TCPStream *s);
105 #include "lws_config.h"
107 #if defined(WIN32) || defined(_WIN32)
108 #ifndef WIN32_LEAN_AND_MEAN
109 #define WIN32_LEAN_AND_MEAN
112 #include <winsock2.h>
113 #include <ws2tcpip.h>
119 #define strcasecmp stricmp
120 #define getdtablesize() 30000
122 #define LWS_INLINE __inline
124 #define LWS_WARN_UNUSED_RESULT
125 #define LWS_WARN_DEPRECATED
129 #define LWS_EXTERN extern __declspec(dllexport)
131 #define LWS_EXTERN extern __declspec(dllimport)
137 #define LWS_INVALID_FILE INVALID_HANDLE_VALUE
138 #define LWS_O_RDONLY _O_RDONLY
140 #else /* NOT WIN32 */
143 #if defined(__NetBSD__)
144 #include <sys/cdefs.h>
145 #include <netinet/in.h>
148 #define LWS_INLINE inline
149 #define LWS_O_RDONLY O_RDONLY
151 #ifndef MBED_OPERATORS
154 #define LWS_INVALID_FILE -1
156 #define getdtablesize() (20)
157 #define LWS_INVALID_FILE NULL
160 #if defined(__GNUC__)
161 #define LWS_VISIBLE __attribute__((visibility("default")))
162 #define LWS_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))
163 #define LWS_WARN_DEPRECATED __attribute__ ((deprecated))
166 #define LWS_WARN_UNUSED_RESULT
167 #define LWS_WARN_DEPRECATED
170 #if defined(__ANDROID__)
172 #define getdtablesize() sysconf(_SC_OPEN_MAX)
179 #endif /* LWS_USE_LIBEV */
182 #endif /* LWS_USE_LIBUV */
185 #define LWS_EXTERN extern
191 #include <sys/time.h>
195 #ifdef LWS_OPENSSL_SUPPORT
197 #ifdef USE_OLD_CYASSL
198 #include <cyassl/openssl/ssl.h>
200 #include <wolfssl/openssl/ssl.h>
201 #endif /* not USE_OLD_CYASSL */
203 #include <openssl/ssl.h>
204 #endif /* not USE_WOLFSSL */
207 #define CONTEXT_PORT_NO_LISTEN -1
209 enum lws_log_levels {
219 LLL_LATENCY = 1 << 9,
221 LLL_COUNT = 10 /* set to count of valid flags */
224 LWS_VISIBLE LWS_EXTERN void _lws_log(int filter, const char *format, ...);
225 LWS_VISIBLE LWS_EXTERN void _lws_logv(int filter, const char *format, va_list vl);
227 /* notice, warn and log are always compiled in */
228 #define lwsl_notice(...) _lws_log(LLL_NOTICE, __VA_ARGS__)
229 #define lwsl_warn(...) _lws_log(LLL_WARN, __VA_ARGS__)
230 #define lwsl_err(...) _lws_log(LLL_ERR, __VA_ARGS__)
232 * weaker logging can be deselected at configure time using --disable-debug
233 * that gets rid of the overhead of checking while keeping _warn and _err
238 #define lwsl_info(...) _lws_log(LLL_INFO, __VA_ARGS__)
239 #define lwsl_debug(...) _lws_log(LLL_DEBUG, __VA_ARGS__)
240 #define lwsl_parser(...) _lws_log(LLL_PARSER, __VA_ARGS__)
241 #define lwsl_header(...) _lws_log(LLL_HEADER, __VA_ARGS__)
242 #define lwsl_ext(...) _lws_log(LLL_EXT, __VA_ARGS__)
243 #define lwsl_client(...) _lws_log(LLL_CLIENT, __VA_ARGS__)
244 #define lwsl_latency(...) _lws_log(LLL_LATENCY, __VA_ARGS__)
245 LWS_VISIBLE LWS_EXTERN void lwsl_hexdump(void *buf, size_t len);
249 #define lwsl_info(...) {}
250 #define lwsl_debug(...) {}
251 #define lwsl_parser(...) {}
252 #define lwsl_header(...) {}
253 #define lwsl_ext(...) {}
254 #define lwsl_client(...) {}
255 #define lwsl_latency(...) {}
256 #define lwsl_hexdump(a, b)
260 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
262 /* api change list for user code to test against */
264 #define LWS_FEATURE_SERVE_HTTP_FILE_HAS_OTHER_HEADERS_ARG
266 /* the struct lws_protocols has the id field present */
267 #define LWS_FEATURE_PROTOCOLS_HAS_ID_FIELD
269 /* you can call lws_get_peer_write_allowance */
270 #define LWS_FEATURE_PROTOCOLS_HAS_PEER_WRITE_ALLOWANCE
272 /* extra parameter introduced in 917f43ab821 */
273 #define LWS_FEATURE_SERVE_HTTP_FILE_HAS_OTHER_HEADERS_LEN
275 /* File operations stuff exists */
276 #define LWS_FEATURE_FOPS
279 * NOTE: These public enums are part of the abi. If you want to add one,
280 * add it at where specified so existing users are unaffected.
282 enum lws_context_options {
283 LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT = (1 << 1),
284 LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME = (1 << 2),
285 LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT = (1 << 3),
286 LWS_SERVER_OPTION_LIBEV = (1 << 4),
287 LWS_SERVER_OPTION_DISABLE_IPV6 = (1 << 5),
288 LWS_SERVER_OPTION_DISABLE_OS_CA_CERTS = (1 << 6),
289 LWS_SERVER_OPTION_PEER_CERT_NOT_REQUIRED = (1 << 7),
290 LWS_SERVER_OPTION_VALIDATE_UTF8 = (1 << 8),
291 LWS_SERVER_OPTION_SSL_ECDH = (1 << 9),
292 LWS_SERVER_OPTION_LIBUV = (1 << 10),
294 /****** add new things just above ---^ ******/
298 * NOTE: These public enums are part of the abi. If you want to add one,
299 * add it at where specified so existing users are unaffected.
301 enum lws_callback_reasons {
302 LWS_CALLBACK_ESTABLISHED = 0,
303 LWS_CALLBACK_CLIENT_CONNECTION_ERROR = 1,
304 LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH = 2,
305 LWS_CALLBACK_CLIENT_ESTABLISHED = 3,
306 LWS_CALLBACK_CLOSED = 4,
307 LWS_CALLBACK_CLOSED_HTTP = 5,
308 LWS_CALLBACK_RECEIVE = 6,
309 LWS_CALLBACK_RECEIVE_PONG = 7,
310 LWS_CALLBACK_CLIENT_RECEIVE = 8,
311 LWS_CALLBACK_CLIENT_RECEIVE_PONG = 9,
312 LWS_CALLBACK_CLIENT_WRITEABLE = 10,
313 LWS_CALLBACK_SERVER_WRITEABLE = 11,
314 LWS_CALLBACK_HTTP = 12,
315 LWS_CALLBACK_HTTP_BODY = 13,
316 LWS_CALLBACK_HTTP_BODY_COMPLETION = 14,
317 LWS_CALLBACK_HTTP_FILE_COMPLETION = 15,
318 LWS_CALLBACK_HTTP_WRITEABLE = 16,
319 LWS_CALLBACK_FILTER_NETWORK_CONNECTION = 17,
320 LWS_CALLBACK_FILTER_HTTP_CONNECTION = 18,
321 LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED = 19,
322 LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION = 20,
323 LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS = 21,
324 LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS = 22,
325 LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION = 23,
326 LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER = 24,
327 LWS_CALLBACK_CONFIRM_EXTENSION_OKAY = 25,
328 LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED = 26,
329 LWS_CALLBACK_PROTOCOL_INIT = 27,
330 LWS_CALLBACK_PROTOCOL_DESTROY = 28,
331 LWS_CALLBACK_WSI_CREATE /* always protocol[0] */ = 29,
332 LWS_CALLBACK_WSI_DESTROY /* always protocol[0] */ = 30,
333 LWS_CALLBACK_GET_THREAD_ID = 31,
335 /* external poll() management support */
336 LWS_CALLBACK_ADD_POLL_FD = 32,
337 LWS_CALLBACK_DEL_POLL_FD = 33,
338 LWS_CALLBACK_CHANGE_MODE_POLL_FD = 34,
339 LWS_CALLBACK_LOCK_POLL = 35,
340 LWS_CALLBACK_UNLOCK_POLL = 36,
342 LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY = 37,
343 LWS_CALLBACK_WS_PEER_INITIATED_CLOSE = 38,
345 LWS_CALLBACK_WS_EXT_DEFAULTS = 39,
347 /****** add new things just above ---^ ******/
349 LWS_CALLBACK_USER = 1000, /* user code can use any including / above */
354 typedef SOCKET lws_sockfd_type;
355 typedef HANDLE lws_filefd_type;
356 #define lws_sockfd_valid(sfd) (!!sfd)
364 #if defined(MBED_OPERATORS)
365 /* it's a class lws_conn * */
366 typedef void * lws_sockfd_type;
367 typedef void * lws_filefd_type;
368 #define lws_sockfd_valid(sfd) (!!sfd)
374 #define POLLIN 0x0001
375 #define POLLPRI 0x0002
376 #define POLLOUT 0x0004
377 #define POLLERR 0x0008
378 #define POLLHUP 0x0010
379 #define POLLNVAL 0x0020
383 void * mbed3_create_tcp_stream_socket(void);
384 void mbed3_delete_tcp_stream_socket(void *sockfd);
385 void mbed3_tcp_stream_bind(void *sock, int port, struct lws *);
386 void mbed3_tcp_stream_accept(void *sock, struct lws *);
388 typedef int lws_sockfd_type;
389 typedef int lws_filefd_type;
390 #define lws_sockfd_valid(sfd) (sfd >= 0)
393 #define lws_pollfd pollfd
396 /* argument structure for all external poll related calls
399 struct lws_pollargs {
400 lws_sockfd_type fd; /* applicable socket descriptor */
401 int events; /* the new event mask */
402 int prev_events; /* the previous event mask */
406 * struct lws_plat_file_ops - Platform-specific file operations
408 * These provide platform-agnostic ways to deal with filesystem access in the
409 * library and in the user code.
411 * @open: Open file (always binary access if plat supports it)
412 * filelen is filled on exit to be the length of the file
413 * flags should be set to O_RDONLY or O_RDWR
415 * @seek_cur: Seek from current position
416 * @read: Read fron file *amount is set on exit to amount read
417 * @write: Write to file *amount is set on exit as amount written
419 struct lws_plat_file_ops {
420 lws_filefd_type (*open)(struct lws *wsi, const char *filename,
421 unsigned long *filelen, int flags);
422 int (*close)(struct lws *wsi, lws_filefd_type fd);
423 unsigned long (*seek_cur)(struct lws *wsi, lws_filefd_type fd,
424 long offset_from_cur_pos);
425 int (*read)(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
426 unsigned char *buf, unsigned long len);
427 int (*write)(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
428 unsigned char *buf, unsigned long len);
430 /* Add new things just above here ---^
431 * This is part of the ABI, don't needlessly break compatibility */
435 * NOTE: These public enums are part of the abi. If you want to add one,
436 * add it at where specified so existing users are unaffected.
438 enum lws_extension_callback_reasons {
439 LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT = 0,
440 LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT = 1,
441 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT = 2,
442 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT = 3,
443 LWS_EXT_CB_CONSTRUCT = 4,
444 LWS_EXT_CB_CLIENT_CONSTRUCT = 5,
445 LWS_EXT_CB_CHECK_OK_TO_REALLY_CLOSE = 6,
446 LWS_EXT_CB_CHECK_OK_TO_PROPOSE_EXTENSION = 7,
447 LWS_EXT_CB_DESTROY = 8,
448 LWS_EXT_CB_DESTROY_ANY_WSI_CLOSING = 9,
449 LWS_EXT_CB_ANY_WSI_ESTABLISHED = 10,
450 LWS_EXT_CB_PACKET_RX_PREPARSE = 11,
451 LWS_EXT_CB_PACKET_TX_PRESEND = 12,
452 LWS_EXT_CB_PACKET_TX_DO_SEND = 13,
453 LWS_EXT_CB_HANDSHAKE_REPLY_TX = 14,
454 LWS_EXT_CB_FLUSH_PENDING_TX = 15,
455 LWS_EXT_CB_EXTENDED_PAYLOAD_RX = 16,
456 LWS_EXT_CB_CAN_PROXY_CLIENT_CONNECTION = 17,
458 LWS_EXT_CB_REQUEST_ON_WRITEABLE = 19,
459 LWS_EXT_CB_IS_WRITEABLE = 20,
460 LWS_EXT_CB_PAYLOAD_TX = 21,
461 LWS_EXT_CB_PAYLOAD_RX = 22,
462 LWS_EXT_CB_OPTION_DEFAULT = 23,
463 LWS_EXT_CB_OPTION_SET = 24,
464 LWS_EXT_CB_OPTION_CONFIRM = 25,
466 /****** add new things just above ---^ ******/
470 * NOTE: These public enums are part of the abi. If you want to add one,
471 * add it at where specified so existing users are unaffected.
473 enum lws_write_protocol {
475 LWS_WRITE_BINARY = 1,
476 LWS_WRITE_CONTINUATION = 2,
479 /* special 04+ opcodes */
481 /* LWS_WRITE_CLOSE is handled by lws_close_reason() */
485 /* Same as write_http but we know this write ends the transaction */
486 LWS_WRITE_HTTP_FINAL = 7,
490 LWS_WRITE_HTTP_HEADERS = 8,
492 /****** add new things just above ---^ ******/
496 LWS_WRITE_NO_FIN = 0x40,
498 * client packet payload goes out on wire unmunged
499 * only useful for security tests since normal servers cannot
500 * decode the content if used
502 LWS_WRITE_CLIENT_IGNORE_XOR_MASK = 0x80
506 * you need these to look at headers that have been parsed if using the
507 * LWS_CALLBACK_FILTER_CONNECTION callback. If a header from the enum
508 * list below is absent, .token = NULL and token_len = 0. Otherwise .token
509 * points to .token_len chars containing that header content.
518 * these have to be kept in sync with lextable.h / minilex.c
520 * NOTE: These public enums are part of the abi. If you want to add one,
521 * add it at where specified so existing users are unaffected.
523 enum lws_token_indexes {
524 WSI_TOKEN_GET_URI = 0,
525 WSI_TOKEN_POST_URI = 1,
526 WSI_TOKEN_OPTIONS_URI = 2,
528 WSI_TOKEN_CONNECTION = 4,
529 WSI_TOKEN_UPGRADE = 5,
530 WSI_TOKEN_ORIGIN = 6,
532 WSI_TOKEN_CHALLENGE = 8,
533 WSI_TOKEN_EXTENSIONS = 9,
536 WSI_TOKEN_PROTOCOL = 12,
537 WSI_TOKEN_ACCEPT = 13,
538 WSI_TOKEN_NONCE = 14,
540 WSI_TOKEN_HTTP2_SETTINGS = 16,
541 WSI_TOKEN_HTTP_ACCEPT = 17,
542 WSI_TOKEN_HTTP_AC_REQUEST_HEADERS = 18,
543 WSI_TOKEN_HTTP_IF_MODIFIED_SINCE = 19,
544 WSI_TOKEN_HTTP_IF_NONE_MATCH = 20,
545 WSI_TOKEN_HTTP_ACCEPT_ENCODING = 21,
546 WSI_TOKEN_HTTP_ACCEPT_LANGUAGE = 22,
547 WSI_TOKEN_HTTP_PRAGMA = 23,
548 WSI_TOKEN_HTTP_CACHE_CONTROL = 24,
549 WSI_TOKEN_HTTP_AUTHORIZATION = 25,
550 WSI_TOKEN_HTTP_COOKIE = 26,
551 WSI_TOKEN_HTTP_CONTENT_LENGTH = 27,
552 WSI_TOKEN_HTTP_CONTENT_TYPE = 28,
553 WSI_TOKEN_HTTP_DATE = 29,
554 WSI_TOKEN_HTTP_RANGE = 30,
555 WSI_TOKEN_HTTP_REFERER = 31,
557 WSI_TOKEN_VERSION = 33,
558 WSI_TOKEN_SWORIGIN = 34,
560 WSI_TOKEN_HTTP_COLON_AUTHORITY = 35,
561 WSI_TOKEN_HTTP_COLON_METHOD = 36,
562 WSI_TOKEN_HTTP_COLON_PATH = 37,
563 WSI_TOKEN_HTTP_COLON_SCHEME = 38,
564 WSI_TOKEN_HTTP_COLON_STATUS = 39,
566 WSI_TOKEN_HTTP_ACCEPT_CHARSET = 40,
567 WSI_TOKEN_HTTP_ACCEPT_RANGES = 41,
568 WSI_TOKEN_HTTP_ACCESS_CONTROL_ALLOW_ORIGIN = 42,
569 WSI_TOKEN_HTTP_AGE = 43,
570 WSI_TOKEN_HTTP_ALLOW = 44,
571 WSI_TOKEN_HTTP_CONTENT_DISPOSITION = 45,
572 WSI_TOKEN_HTTP_CONTENT_ENCODING = 46,
573 WSI_TOKEN_HTTP_CONTENT_LANGUAGE = 47,
574 WSI_TOKEN_HTTP_CONTENT_LOCATION = 48,
575 WSI_TOKEN_HTTP_CONTENT_RANGE = 49,
576 WSI_TOKEN_HTTP_ETAG = 50,
577 WSI_TOKEN_HTTP_EXPECT = 51,
578 WSI_TOKEN_HTTP_EXPIRES = 52,
579 WSI_TOKEN_HTTP_FROM = 53,
580 WSI_TOKEN_HTTP_IF_MATCH = 54,
581 WSI_TOKEN_HTTP_IF_RANGE = 55,
582 WSI_TOKEN_HTTP_IF_UNMODIFIED_SINCE = 56,
583 WSI_TOKEN_HTTP_LAST_MODIFIED = 57,
584 WSI_TOKEN_HTTP_LINK = 58,
585 WSI_TOKEN_HTTP_LOCATION = 59,
586 WSI_TOKEN_HTTP_MAX_FORWARDS = 60,
587 WSI_TOKEN_HTTP_PROXY_AUTHENTICATE = 61,
588 WSI_TOKEN_HTTP_PROXY_AUTHORIZATION = 62,
589 WSI_TOKEN_HTTP_REFRESH = 63,
590 WSI_TOKEN_HTTP_RETRY_AFTER = 64,
591 WSI_TOKEN_HTTP_SERVER = 65,
592 WSI_TOKEN_HTTP_SET_COOKIE = 66,
593 WSI_TOKEN_HTTP_STRICT_TRANSPORT_SECURITY = 67,
594 WSI_TOKEN_HTTP_TRANSFER_ENCODING = 68,
595 WSI_TOKEN_HTTP_USER_AGENT = 69,
596 WSI_TOKEN_HTTP_VARY = 70,
597 WSI_TOKEN_HTTP_VIA = 71,
598 WSI_TOKEN_HTTP_WWW_AUTHENTICATE = 72,
600 WSI_TOKEN_PATCH_URI = 73,
601 WSI_TOKEN_PUT_URI = 74,
602 WSI_TOKEN_DELETE_URI = 75,
604 WSI_TOKEN_HTTP_URI_ARGS = 76,
605 WSI_TOKEN_PROXY = 77,
606 WSI_TOKEN_HTTP_X_REAL_IP = 78,
608 /****** add new things just above ---^ ******/
610 /* use token storage to stash these internally, not for
613 _WSI_TOKEN_CLIENT_SENT_PROTOCOLS,
614 _WSI_TOKEN_CLIENT_PEER_ADDRESS,
615 _WSI_TOKEN_CLIENT_URI,
616 _WSI_TOKEN_CLIENT_HOST,
617 _WSI_TOKEN_CLIENT_ORIGIN,
619 /* always last real token index*/
622 /* parser state additions, no storage associated */
625 WSI_TOKEN_SKIPPING_SAW_CR,
626 WSI_PARSING_COMPLETE,
627 WSI_INIT_TOKEN_MUXURL,
630 struct lws_token_limits {
631 unsigned short token_limit[WSI_TOKEN_COUNT];
638 1000 indicates a normal closure, meaning that the purpose for
639 which the connection was established has been fulfilled.
643 1001 indicates that an endpoint is "going away", such as a server
644 going down or a browser having navigated away from a page.
648 1002 indicates that an endpoint is terminating the connection due
653 1003 indicates that an endpoint is terminating the connection
654 because it has received a type of data it cannot accept (e.g., an
655 endpoint that understands only text data MAY send this if it
656 receives a binary message).
660 Reserved. The specific meaning might be defined in the future.
664 1005 is a reserved value and MUST NOT be set as a status code in a
665 Close control frame by an endpoint. It is designated for use in
666 applications expecting a status code to indicate that no status
667 code was actually present.
671 1006 is a reserved value and MUST NOT be set as a status code in a
672 Close control frame by an endpoint. It is designated for use in
673 applications expecting a status code to indicate that the
674 connection was closed abnormally, e.g., without sending or
675 receiving a Close control frame.
679 1007 indicates that an endpoint is terminating the connection
680 because it has received data within a message that was not
681 consistent with the type of the message (e.g., non-UTF-8 [RFC3629]
682 data within a text message).
686 1008 indicates that an endpoint is terminating the connection
687 because it has received a message that violates its policy. This
688 is a generic status code that can be returned when there is no
689 other more suitable status code (e.g., 1003 or 1009) or if there
690 is a need to hide specific details about the policy.
694 1009 indicates that an endpoint is terminating the connection
695 because it has received a message that is too big for it to
700 1010 indicates that an endpoint (client) is terminating the
701 connection because it has expected the server to negotiate one or
702 more extension, but the server didn't return them in the response
703 message of the WebSocket handshake. The list of extensions that
704 are needed SHOULD appear in the /reason/ part of the Close frame.
705 Note that this status code is not used by the server, because it
706 can fail the WebSocket handshake instead.
710 1011 indicates that a server is terminating the connection because
711 it encountered an unexpected condition that prevented it from
712 fulfilling the request.
716 1015 is a reserved value and MUST NOT be set as a status code in a
717 Close control frame by an endpoint. It is designated for use in
718 applications expecting a status code to indicate that the
719 connection was closed due to a failure to perform a TLS handshake
720 (e.g., the server certificate can't be verified).
724 * NOTE: These public enums are part of the abi. If you want to add one,
725 * add it at where specified so existing users are unaffected.
727 enum lws_close_status {
728 LWS_CLOSE_STATUS_NOSTATUS = 0,
729 LWS_CLOSE_STATUS_NORMAL = 1000,
730 LWS_CLOSE_STATUS_GOINGAWAY = 1001,
731 LWS_CLOSE_STATUS_PROTOCOL_ERR = 1002,
732 LWS_CLOSE_STATUS_UNACCEPTABLE_OPCODE = 1003,
733 LWS_CLOSE_STATUS_RESERVED = 1004,
734 LWS_CLOSE_STATUS_NO_STATUS = 1005,
735 LWS_CLOSE_STATUS_ABNORMAL_CLOSE = 1006,
736 LWS_CLOSE_STATUS_INVALID_PAYLOAD = 1007,
737 LWS_CLOSE_STATUS_POLICY_VIOLATION = 1008,
738 LWS_CLOSE_STATUS_MESSAGE_TOO_LARGE = 1009,
739 LWS_CLOSE_STATUS_EXTENSION_REQUIRED = 1010,
740 LWS_CLOSE_STATUS_UNEXPECTED_CONDITION = 1011,
741 LWS_CLOSE_STATUS_TLS_FAILURE = 1015,
743 /****** add new things just above ---^ ******/
745 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY = 9999,
749 HTTP_STATUS_OK = 200,
750 HTTP_STATUS_NO_CONTENT = 204,
752 HTTP_STATUS_BAD_REQUEST = 400,
753 HTTP_STATUS_UNAUTHORIZED,
754 HTTP_STATUS_PAYMENT_REQUIRED,
755 HTTP_STATUS_FORBIDDEN,
756 HTTP_STATUS_NOT_FOUND,
757 HTTP_STATUS_METHOD_NOT_ALLOWED,
758 HTTP_STATUS_NOT_ACCEPTABLE,
759 HTTP_STATUS_PROXY_AUTH_REQUIRED,
760 HTTP_STATUS_REQUEST_TIMEOUT,
761 HTTP_STATUS_CONFLICT,
763 HTTP_STATUS_LENGTH_REQUIRED,
764 HTTP_STATUS_PRECONDITION_FAILED,
765 HTTP_STATUS_REQ_ENTITY_TOO_LARGE,
766 HTTP_STATUS_REQ_URI_TOO_LONG,
767 HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE,
768 HTTP_STATUS_REQ_RANGE_NOT_SATISFIABLE,
769 HTTP_STATUS_EXPECTATION_FAILED,
771 HTTP_STATUS_INTERNAL_SERVER_ERROR = 500,
772 HTTP_STATUS_NOT_IMPLEMENTED,
773 HTTP_STATUS_BAD_GATEWAY,
774 HTTP_STATUS_SERVICE_UNAVAILABLE,
775 HTTP_STATUS_GATEWAY_TIMEOUT,
776 HTTP_STATUS_HTTP_VERSION_NOT_SUPPORTED,
781 /* needed even with extensions disabled for create context */
782 struct lws_extension;
785 * typedef lws_callback_function() - User server actions
786 * @wsi: Opaque websocket instance pointer
787 * @reason: The reason for the call
788 * @user: Pointer to per-session user data allocated by library
789 * @in: Pointer used for some callback reasons
790 * @len: Length set for some callback reasons
792 * This callback is the way the user controls what is served. All the
793 * protocol detail is hidden and handled by the library.
795 * For each connection / session there is user data allocated that is
796 * pointed to by "user". You set the size of this user data area when
797 * the library is initialized with lws_create_server.
799 * You get an opportunity to initialize user data when called back with
800 * LWS_CALLBACK_ESTABLISHED reason.
802 * LWS_CALLBACK_ESTABLISHED: after the server completes a handshake with
803 * an incoming client. If you built the library
804 * with ssl support, @in is a pointer to the
805 * ssl struct associated with the connection or
808 * LWS_CALLBACK_CLIENT_CONNECTION_ERROR: the request client connection has
809 * been unable to complete a handshake with the remote server. If
810 * in is non-NULL, you can find an error string of length len where
813 * LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH: this is the last chance for the
814 * client user code to examine the http headers
815 * and decide to reject the connection. If the
816 * content in the headers is interesting to the
817 * client (url, etc) it needs to copy it out at
818 * this point since it will be destroyed before
819 * the CLIENT_ESTABLISHED call
821 * LWS_CALLBACK_CLIENT_ESTABLISHED: after your client connection completed
822 * a handshake with the remote server
824 * LWS_CALLBACK_CLOSED: when the websocket session ends
826 * LWS_CALLBACK_CLOSED_HTTP: when a HTTP (non-websocket) session ends
828 * LWS_CALLBACK_RECEIVE: data has appeared for this server endpoint from a
829 * remote client, it can be found at *in and is
832 * LWS_CALLBACK_CLIENT_RECEIVE_PONG: if you elected to see PONG packets,
833 * they appear with this callback reason. PONG
834 * packets only exist in 04+ protocol
836 * LWS_CALLBACK_CLIENT_RECEIVE: data has appeared from the server for the
837 * client connection, it can be found at *in and
840 * LWS_CALLBACK_HTTP: an http request has come from a client that is not
841 * asking to upgrade the connection to a websocket
842 * one. This is a chance to serve http content,
843 * for example, to send a script to the client
844 * which will then open the websockets connection.
845 * @in points to the URI path requested and
846 * lws_serve_http_file() makes it very
847 * simple to send back a file to the client.
848 * Normally after sending the file you are done
849 * with the http connection, since the rest of the
850 * activity will come by websockets from the script
851 * that was delivered by http, so you will want to
852 * return 1; to close and free up the connection.
853 * That's important because it uses a slot in the
854 * total number of client connections allowed set
857 * LWS_CALLBACK_HTTP_BODY: the next @len bytes data from the http
858 * request body HTTP connection is now available in @in.
860 * LWS_CALLBACK_HTTP_BODY_COMPLETION: the expected amount of http request
861 * body has been delivered
863 * LWS_CALLBACK_HTTP_WRITEABLE: you can write more down the http protocol
866 * LWS_CALLBACK_HTTP_FILE_COMPLETION: a file requested to be send down
867 * http link has completed.
869 * LWS_CALLBACK_CLIENT_WRITEABLE:
870 * LWS_CALLBACK_SERVER_WRITEABLE: If you call
871 * lws_callback_on_writable() on a connection, you will
872 * get one of these callbacks coming when the connection socket
873 * is able to accept another write packet without blocking.
874 * If it already was able to take another packet without blocking,
875 * you'll get this callback at the next call to the service loop
876 * function. Notice that CLIENTs get LWS_CALLBACK_CLIENT_WRITEABLE
877 * and servers get LWS_CALLBACK_SERVER_WRITEABLE.
879 * LWS_CALLBACK_FILTER_NETWORK_CONNECTION: called when a client connects to
880 * the server at network level; the connection is accepted but then
881 * passed to this callback to decide whether to hang up immediately
882 * or not, based on the client IP. @in contains the connection
883 * socket's descriptor. Since the client connection information is
884 * not available yet, @wsi still pointing to the main server socket.
885 * Return non-zero to terminate the connection before sending or
886 * receiving anything. Because this happens immediately after the
887 * network connection from the client, there's no websocket protocol
888 * selected yet so this callback is issued only to protocol 0.
890 * LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED: A new client just had
891 * been connected, accepted, and instantiated into the pool. This
892 * callback allows setting any relevant property to it. Because this
893 * happens immediately after the instantiation of a new client,
894 * there's no websocket protocol selected yet so this callback is
895 * issued only to protocol 0. Only @wsi is defined, pointing to the
896 * new client, and the return value is ignored.
898 * LWS_CALLBACK_FILTER_HTTP_CONNECTION: called when the request has
899 * been received and parsed from the client, but the response is
900 * not sent yet. Return non-zero to disallow the connection.
901 * @user is a pointer to the connection user space allocation,
902 * @in is the URI, eg, "/"
903 * In your handler you can use the public APIs
904 * lws_hdr_total_length() / lws_hdr_copy() to access all of the
905 * headers using the header enums lws_token_indexes from
906 * libwebsockets.h to check for and read the supported header
907 * presence and content before deciding to allow the http
908 * connection to proceed or to kill the connection.
910 * LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION: called when the handshake has
911 * been received and parsed from the client, but the response is
912 * not sent yet. Return non-zero to disallow the connection.
913 * @user is a pointer to the connection user space allocation,
914 * @in is the requested protocol name
915 * In your handler you can use the public APIs
916 * lws_hdr_total_length() / lws_hdr_copy() to access all of the
917 * headers using the header enums lws_token_indexes from
918 * libwebsockets.h to check for and read the supported header
919 * presence and content before deciding to allow the handshake
920 * to proceed or to kill the connection.
922 * LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS: if configured for
923 * including OpenSSL support, this callback allows your user code
924 * to perform extra SSL_CTX_load_verify_locations() or similar
925 * calls to direct OpenSSL where to find certificates the client
926 * can use to confirm the remote server identity. @user is the
929 * LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS: if configured for
930 * including OpenSSL support, this callback allows your user code
931 * to load extra certifcates into the server which allow it to
932 * verify the validity of certificates returned by clients. @user
933 * is the server's OpenSSL SSL_CTX*
935 * LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY: if configured for
936 * including OpenSSL support but no private key file has been
937 * specified (ssl_private_key_filepath is NULL), this is called to
938 * allow the user to set the private key directly via libopenssl
939 * and perform further operations if required; this might be useful
940 * in situations where the private key is not directly accessible
941 * by the OS, for example if it is stored on a smartcard
942 * @user is the server's OpenSSL SSL_CTX*
944 * LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION: if the
945 * libwebsockets context was created with the option
946 * LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT, then this
947 * callback is generated during OpenSSL verification of the cert
948 * sent from the client. It is sent to protocol[0] callback as
949 * no protocol has been negotiated on the connection yet.
950 * Notice that the libwebsockets context and wsi are both NULL
951 * during this callback. See
952 * http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
953 * to understand more detail about the OpenSSL callback that
954 * generates this libwebsockets callback and the meanings of the
955 * arguments passed. In this callback, @user is the x509_ctx,
956 * @in is the ssl pointer and @len is preverify_ok
957 * Notice that this callback maintains libwebsocket return
958 * conventions, return 0 to mean the cert is OK or 1 to fail it.
959 * This also means that if you don't handle this callback then
960 * the default callback action of returning 0 allows the client
963 * LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER: this callback happens
964 * when a client handshake is being compiled. @user is NULL,
965 * @in is a char **, it's pointing to a char * which holds the
966 * next location in the header buffer where you can add
967 * headers, and @len is the remaining space in the header buffer,
968 * which is typically some hundreds of bytes. So, to add a canned
969 * cookie, your handler code might look similar to:
971 * char **p = (char **)in;
976 * *p += sprintf(*p, "Cookie: a=b\x0d\x0a");
980 * Notice if you add anything, you just have to take care about
981 * the CRLF on the line you added. Obviously this callback is
982 * optional, if you don't handle it everything is fine.
984 * Notice the callback is coming to protocols[0] all the time,
985 * because there is no specific protocol handshook yet.
987 * LWS_CALLBACK_CONFIRM_EXTENSION_OKAY: When the server handshake code
988 * sees that it does support a requested extension, before
989 * accepting the extension by additing to the list sent back to
990 * the client it gives this callback just to check that it's okay
991 * to use that extension. It calls back to the requested protocol
992 * and with @in being the extension name, @len is 0 and @user is
993 * valid. Note though at this time the ESTABLISHED callback hasn't
994 * happened yet so if you initialize @user content there, @user
995 * content during this callback might not be useful for anything.
996 * Notice this callback comes to protocols[0].
998 * LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED: When a client
999 * connection is being prepared to start a handshake to a server,
1000 * each supported extension is checked with protocols[0] callback
1001 * with this reason, giving the user code a chance to suppress the
1002 * claim to support that extension by returning non-zero. If
1003 * unhandled, by default 0 will be returned and the extension
1004 * support included in the header to the server. Notice this
1005 * callback comes to protocols[0].
1007 * LWS_CALLBACK_PROTOCOL_INIT: One-time call per protocol so it can
1008 * do initial setup / allocations etc
1010 * LWS_CALLBACK_PROTOCOL_DESTROY: One-time call per protocol indicating
1011 * this protocol won't get used at all after this callback, the
1012 * context is getting destroyed. Take the opportunity to
1013 * deallocate everything that was allocated by the protocol.
1015 * LWS_CALLBACK_WSI_CREATE: outermost (earliest) wsi create notification
1017 * LWS_CALLBACK_WSI_DESTROY: outermost (latest) wsi destroy notification
1019 * The next five reasons are optional and only need taking care of if you
1020 * will be integrating libwebsockets sockets into an external polling
1023 * For these calls, @in points to a struct lws_pollargs that
1024 * contains @fd, @events and @prev_events members
1026 * LWS_CALLBACK_ADD_POLL_FD: libwebsocket deals with its poll() loop
1027 * internally, but in the case you are integrating with another
1028 * server you will need to have libwebsocket sockets share a
1029 * polling array with the other server. This and the other
1030 * POLL_FD related callbacks let you put your specialized
1031 * poll array interface code in the callback for protocol 0, the
1032 * first protocol you support, usually the HTTP protocol in the
1034 * This callback happens when a socket needs to be
1035 * added to the polling loop: @in points to a struct
1036 * lws_pollargs; the @fd member of the struct is the file
1037 * descriptor, and @events contains the active events.
1039 * If you are using the internal polling loop (the "service"
1040 * callback), you can just ignore these callbacks.
1042 * LWS_CALLBACK_DEL_POLL_FD: This callback happens when a socket descriptor
1043 * needs to be removed from an external polling array. @in is
1044 * again the struct lws_pollargs containing the @fd member
1045 * to be removed. If you are using the internal polling
1046 * loop, you can just ignore it.
1048 * LWS_CALLBACK_CHANGE_MODE_POLL_FD: This callback happens when
1049 * libwebsockets wants to modify the events for a connectiion.
1050 * @in is the struct lws_pollargs with the @fd to change.
1051 * The new event mask is in @events member and the old mask is in
1052 * the @prev_events member.
1053 * If you are using the internal polling loop, you can just ignore
1056 * LWS_CALLBACK_LOCK_POLL:
1057 * LWS_CALLBACK_UNLOCK_POLL: These allow the external poll changes driven
1058 * by libwebsockets to participate in an external thread locking
1059 * scheme around the changes, so the whole thing is threadsafe.
1060 * These are called around three activities in the library,
1061 * - inserting a new wsi in the wsi / fd table (len=1)
1062 * - deleting a wsi from the wsi / fd table (len=1)
1063 * - changing a wsi's POLLIN/OUT state (len=0)
1064 * Locking and unlocking external synchronization objects when
1065 * len == 1 allows external threads to be synchronized against
1066 * wsi lifecycle changes if it acquires the same lock for the
1067 * duration of wsi dereference from the other thread context.
1069 * LWS_CALLBACK_WS_PEER_INITIATED_CLOSE:
1070 * The peer has sent an unsolicited Close WS packet. @in and
1071 * @len are the optional close code (first 2 bytes, network
1072 * order) and the optional additional information which is not
1073 * defined in the standard, and may be a string or non-human-
1075 * If you return 0 lws will echo the close and then close the
1076 * connection. If you return nonzero lws will just close the
1080 lws_callback_function(struct lws *wsi, enum lws_callback_reasons reason,
1081 void *user, void *in, size_t len);
1084 * typedef lws_extension_callback_function() - Hooks to allow extensions to operate
1085 * @context: Websockets context
1086 * @ext: This extension
1087 * @wsi: Opaque websocket instance pointer
1088 * @reason: The reason for the call
1089 * @user: Pointer to ptr to per-session user data allocated by library
1090 * @in: Pointer used for some callback reasons
1091 * @len: Length set for some callback reasons
1093 * Each extension that is active on a particular connection receives
1094 * callbacks during the connection lifetime to allow the extension to
1095 * operate on websocket data and manage itself.
1097 * Libwebsockets takes care of allocating and freeing "user" memory for
1098 * each active extension on each connection. That is what is pointed to
1099 * by the @user parameter.
1101 * LWS_EXT_CB_CONSTRUCT: called when the server has decided to
1102 * select this extension from the list provided by the client,
1103 * just before the server will send back the handshake accepting
1104 * the connection with this extension active. This gives the
1105 * extension a chance to initialize its connection context found
1108 * LWS_EXT_CB_CLIENT_CONSTRUCT: same as LWS_EXT_CB_CONSTRUCT
1109 * but called when client is instantiating this extension. Some
1110 * extensions will work the same on client and server side and then
1111 * you can just merge handlers for both CONSTRUCTS.
1113 * LWS_EXT_CB_DESTROY: called when the connection the extension was
1114 * being used on is about to be closed and deallocated. It's the
1115 * last chance for the extension to deallocate anything it has
1116 * allocated in the user data (pointed to by @user) before the
1117 * user data is deleted. This same callback is used whether you
1118 * are in client or server instantiation context.
1120 * LWS_EXT_CB_PACKET_RX_PREPARSE: when this extension was active on
1121 * a connection, and a packet of data arrived at the connection,
1122 * it is passed to this callback to give the extension a chance to
1123 * change the data, eg, decompress it. @user is pointing to the
1124 * extension's private connection context data, @in is pointing
1125 * to an lws_tokens struct, it consists of a char * pointer called
1126 * token, and an int called token_len. At entry, these are
1127 * set to point to the received buffer and set to the content
1128 * length. If the extension will grow the content, it should use
1129 * a new buffer allocated in its private user context data and
1130 * set the pointed-to lws_tokens members to point to its buffer.
1132 * LWS_EXT_CB_PACKET_TX_PRESEND: this works the same way as
1133 * LWS_EXT_CB_PACKET_RX_PREPARSE above, except it gives the
1134 * extension a chance to change websocket data just before it will
1135 * be sent out. Using the same lws_token pointer scheme in @in,
1136 * the extension can change the buffer and the length to be
1137 * transmitted how it likes. Again if it wants to grow the
1138 * buffer safely, it should copy the data into its own buffer and
1139 * set the lws_tokens token pointer to it.
1141 * LWS_EXT_CB_ARGS_VALIDATE:
1144 lws_extension_callback_function(struct lws_context *context,
1145 const struct lws_extension *ext, struct lws *wsi,
1146 enum lws_extension_callback_reasons reason,
1147 void *user, void *in, size_t len);
1150 * struct lws_protocols - List of protocols and handlers server
1152 * @name: Protocol name that must match the one given in the client
1153 * Javascript new WebSocket(url, 'protocol') name.
1154 * @callback: The service callback used for this protocol. It allows the
1155 * service action for an entire protocol to be encapsulated in
1156 * the protocol-specific callback
1157 * @per_session_data_size: Each new connection using this protocol gets
1158 * this much memory allocated on connection establishment and
1159 * freed on connection takedown. A pointer to this per-connection
1160 * allocation is passed into the callback in the 'user' parameter
1161 * @rx_buffer_size: if you want atomic frames delivered to the callback, you
1162 * should set this to the size of the biggest legal frame that
1163 * you support. If the frame size is exceeded, there is no
1164 * error, but the buffer will spill to the user callback when
1165 * full, which you can detect by using
1166 * lws_remaining_packet_payload(). Notice that you
1167 * just talk about frame size here, the LWS_PRE
1168 * and post-padding are automatically also allocated on top.
1169 * @id: ignored by lws, but useful to contain user information bound
1170 * to the selected protocol. For example if this protocol was
1171 * called "myprotocol-v2", you might set id to 2, and the user
1172 * code that acts differently according to the version can do so by
1173 * switch (wsi->protocol->id), user code might use some bits as
1174 * capability flags based on selected protocol version, etc.
1175 * @user: User provided context data at the protocol level.
1176 * Accessible via lws_get_protocol(wsi)->user
1177 * This should not be confused with wsi->user, it is not the same.
1178 * The library completely ignores any value in here.
1180 * This structure represents one protocol supported by the server. An
1181 * array of these structures is passed to lws_create_server()
1182 * allows as many protocols as you like to be handled by one server.
1184 * The first protocol given has its callback used for user callbacks when
1185 * there is no agreed protocol name, that's true during HTTP part of the
1186 * connection and true if the client did not send a Protocol: header.
1189 struct lws_protocols {
1191 lws_callback_function *callback;
1192 size_t per_session_data_size;
1193 size_t rx_buffer_size;
1197 /* Add new things just above here ---^
1198 * This is part of the ABI, don't needlessly break compatibility */
1201 enum lws_ext_options_types {
1206 /* Add new things just above here ---^
1207 * This is part of the ABI, don't needlessly break compatibility */
1211 * struct lws_ext_options - Option arguments to the extension. These are
1212 * used in the negotiation at ws upgrade time.
1213 * The helper function lws_ext_parse_options()
1214 * uses these to generate callbacks
1216 * @name: Option name, eg, "server_no_context_takeover"
1217 * @type: What kind of args the option can take
1219 struct lws_ext_options {
1221 enum lws_ext_options_types type;
1223 /* Add new things just above here ---^
1224 * This is part of the ABI, don't needlessly break compatibility */
1227 struct lws_ext_option_arg {
1234 * struct lws_extension - An extension we know how to cope with
1236 * @name: Formal extension name, eg, "permessage-deflate"
1237 * @callback: Service callback
1238 * @client_offer: String containing exts and options client offers
1241 struct lws_extension {
1243 lws_extension_callback_function *callback;
1244 const char *client_offer;
1246 /* Add new things just above here ---^
1247 * This is part of the ABI, don't needlessly break compatibility */
1251 * The internal exts are part of the public abi
1252 * If we add more extensions, publish the callback here ------v
1255 extern int lws_extension_callback_pm_deflate(
1256 struct lws_context *context, const struct lws_extension *ext,
1257 struct lws *wsi, enum lws_extension_callback_reasons reason,
1258 void *user, void *in, size_t len);
1262 * struct lws_context_creation_info - parameters to create context with
1264 * @port: Port to listen on... you can use CONTEXT_PORT_NO_LISTEN to
1265 * suppress listening on any port, that's what you want if you are
1266 * not running a websocket server at all but just using it as a
1268 * @iface: NULL to bind the listen socket to all interfaces, or the
1269 * interface name, eg, "eth2"
1270 * @protocols: Array of structures listing supported protocols and a protocol-
1271 * specific callback for each one. The list is ended with an
1272 * entry that has a NULL callback pointer.
1273 * It's not const because we write the owning_server member
1274 * @extensions: NULL or array of lws_extension structs listing the
1275 * extensions this context supports. If you configured with
1276 * --without-extensions, you should give NULL here.
1277 * @token_limits: NULL or struct lws_token_limits pointer which is initialized
1278 * with a token length limit for each possible WSI_TOKEN_***
1279 * @ssl_cert_filepath: If libwebsockets was compiled to use ssl, and you want
1280 * to listen using SSL, set to the filepath to fetch the
1281 * server cert from, otherwise NULL for unencrypted
1282 * @ssl_private_key_filepath: filepath to private key if wanting SSL mode;
1283 * if this is set to NULL but sll_cert_filepath is set, the
1284 * OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY callback is called
1285 * to allow setting of the private key directly via openSSL
1287 * @ssl_ca_filepath: CA certificate filepath or NULL
1288 * @ssl_cipher_list: List of valid ciphers to use (eg,
1289 * "RC4-MD5:RC4-SHA:AES128-SHA:AES256-SHA:HIGH:!DSS:!aNULL"
1290 * or you can leave it as NULL to get "DEFAULT"
1291 * @http_proxy_address: If non-NULL, attempts to proxy via the given address.
1292 * If proxy auth is required, use format
1293 * "username:password@server:port"
1294 * @http_proxy_port: If http_proxy_address was non-NULL, uses this port at
1296 * @gid: group id to change to after setting listen socket, or -1.
1297 * @uid: user id to change to after setting listen socket, or -1.
1298 * @options: 0, or LWS_SERVER_OPTION_... bitfields
1299 * @user: optional user pointer that can be recovered via the context
1300 * pointer using lws_context_user
1301 * @ka_time: 0 for no keepalive, otherwise apply this keepalive timeout to
1302 * all libwebsocket sockets, client or server
1303 * @ka_probes: if ka_time was nonzero, after the timeout expires how many
1304 * times to try to get a response from the peer before giving up
1305 * and killing the connection
1306 * @ka_interval: if ka_time was nonzero, how long to wait before each ka_probes
1308 * @provided_client_ssl_ctx: If non-null, swap out libwebsockets ssl
1309 * implementation for the one provided by provided_ssl_ctx.
1310 * Libwebsockets no longer is responsible for freeing the context
1311 * if this option is selected.
1312 * @max_http_header_data: The max amount of header payload that can be handled
1313 * in an http request (unrecognized header payload is dropped)
1314 * @max_http_header_pool: The max number of connections with http headers that
1315 * can be processed simultaneously (the corresponding memory is
1316 * allocated for the lifetime of the context). If the pool is
1317 * busy new incoming connections must wait for accept until one
1319 * @count_threads: how many contexts to create in an array, 0 = 1
1320 * @fd_limit_per_thread: nonzero means restrict each service thread to this
1321 * many fds, 0 means the default which is divide the process fd
1322 * limit by the number of threads.
1323 * @timeout_secs: various processes involving network roundtrips in the
1324 * library are protected from hanging forever by timeouts. If
1325 * nonzero, this member lets you set the timeout used in seconds.
1326 * Otherwise a default timeout is used.
1329 struct lws_context_creation_info {
1332 const struct lws_protocols *protocols;
1333 const struct lws_extension *extensions;
1334 const struct lws_token_limits *token_limits;
1335 const char *ssl_private_key_password;
1336 const char *ssl_cert_filepath;
1337 const char *ssl_private_key_filepath;
1338 const char *ssl_ca_filepath;
1339 const char *ssl_cipher_list;
1340 const char *http_proxy_address;
1341 unsigned int http_proxy_port;
1344 unsigned int options;
1349 #ifdef LWS_OPENSSL_SUPPORT
1350 SSL_CTX *provided_client_ssl_ctx;
1351 #else /* maintain structure layout either way */
1352 void *provided_client_ssl_ctx;
1355 short max_http_header_data;
1356 short max_http_header_pool;
1358 unsigned int count_threads;
1359 unsigned int fd_limit_per_thread;
1360 unsigned int timeout_secs;
1362 /* Add new things just above here ---^
1363 * This is part of the ABI, don't needlessly break compatibility
1365 * The below is to ensure later library versions with new
1366 * members added above will see 0 (default) even if the app
1367 * was not built against the newer headers.
1374 * struct lws_client_connect_info - parameters to connect with when using
1375 * lws_client_connect_via_info()
1377 * @context: lws context to create connection in
1378 * @address: remote address to connect to
1379 * @port: remote port to connect to
1380 * @ssl_connection: nonzero for ssl
1382 * @host: content of host header
1383 * @origin: content of origin header
1384 * @protocol: list of ws protocols
1385 * @ietf_version_or_minus_one: currently leave at 0 or -1
1386 * @userdata: if non-NULL, use this as wsi user_data instead of malloc it
1387 * @client_exts: array of extensions that may be used on connection
1390 struct lws_client_connect_info {
1391 struct lws_context *context;
1392 const char *address;
1398 const char *protocol;
1399 int ietf_version_or_minus_one;
1401 const struct lws_extension *client_exts;
1403 /* Add new things just above here ---^
1404 * This is part of the ABI, don't needlessly break compatibility
1406 * The below is to ensure later library versions with new
1407 * members added above will see 0 (default) even if the app
1408 * was not built against the newer headers.
1414 LWS_VISIBLE LWS_EXTERN void
1415 lws_set_log_level(int level,
1416 void (*log_emit_function)(int level, const char *line));
1418 LWS_VISIBLE LWS_EXTERN void
1419 lwsl_emit_syslog(int level, const char *line);
1421 LWS_VISIBLE LWS_EXTERN struct lws_context *
1422 lws_create_context(struct lws_context_creation_info *info);
1424 LWS_VISIBLE LWS_EXTERN int
1425 lws_set_proxy(struct lws_context *context, const char *proxy);
1427 LWS_VISIBLE LWS_EXTERN void
1428 lws_context_destroy(struct lws_context *context);
1430 LWS_VISIBLE LWS_EXTERN int
1431 lws_service(struct lws_context *context, int timeout_ms);
1433 LWS_VISIBLE LWS_EXTERN int
1434 lws_service_tsi(struct lws_context *context, int timeout_ms, int tsi);
1436 LWS_VISIBLE LWS_EXTERN void
1437 lws_cancel_service_pt(struct lws *wsi);
1439 LWS_VISIBLE LWS_EXTERN void
1440 lws_cancel_service(struct lws_context *context);
1442 LWS_VISIBLE LWS_EXTERN int
1443 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
1446 LWS_VISIBLE LWS_EXTERN const unsigned char *
1447 lws_token_to_string(enum lws_token_indexes token);
1449 LWS_VISIBLE LWS_EXTERN int
1450 lws_add_http_header_by_name(struct lws *wsi, const unsigned char *name,
1451 const unsigned char *value, int length,
1452 unsigned char **p, unsigned char *end);
1453 LWS_VISIBLE LWS_EXTERN int
1454 lws_finalize_http_header(struct lws *wsi, unsigned char **p,
1455 unsigned char *end);
1456 LWS_VISIBLE LWS_EXTERN int
1457 lws_add_http_header_by_token(struct lws *wsi, enum lws_token_indexes token,
1458 const unsigned char *value, int length,
1459 unsigned char **p, unsigned char *end);
1460 LWS_VISIBLE LWS_EXTERN int
1461 lws_add_http_header_content_length(struct lws *wsi,
1462 unsigned long content_length,
1463 unsigned char **p, unsigned char *end);
1464 LWS_VISIBLE LWS_EXTERN int
1465 lws_add_http_header_status(struct lws *wsi,
1466 unsigned int code, unsigned char **p,
1467 unsigned char *end);
1469 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1470 lws_http_transaction_completed(struct lws *wsi);
1472 #ifdef LWS_USE_LIBEV
1473 typedef void (lws_ev_signal_cb_t)(EV_P_ struct ev_signal *w, int revents);
1475 LWS_VISIBLE LWS_EXTERN int
1476 lws_ev_sigint_cfg(struct lws_context *context, int use_ev_sigint,
1477 lws_ev_signal_cb_t *cb);
1479 LWS_VISIBLE LWS_EXTERN int
1480 lws_ev_initloop(struct lws_context *context, struct ev_loop *loop, int tsi);
1483 lws_ev_sigint_cb(struct ev_loop *loop, struct ev_signal *watcher, int revents);
1484 #endif /* LWS_USE_LIBEV */
1486 #ifdef LWS_USE_LIBUV
1487 typedef void (lws_uv_signal_cb_t)(uv_loop_t *l, uv_signal_t *w, int revents);
1489 LWS_VISIBLE LWS_EXTERN int
1490 lws_uv_sigint_cfg(struct lws_context *context, int use_uv_sigint,
1491 lws_uv_signal_cb_t *cb);
1493 LWS_VISIBLE LWS_EXTERN void
1494 lws_libuv_run(const struct lws_context *context, int tsi);
1497 lws_libuv_stop(struct lws_context *context);
1499 LWS_VISIBLE LWS_EXTERN int
1500 lws_uv_initloop(struct lws_context *context, uv_loop_t *loop, uv_signal_cb cb, int tsi);
1502 LWS_VISIBLE LWS_EXTERN uv_loop_t *
1503 lws_uv_getloop(struct lws_context *context, int tsi);
1506 lws_uv_sigint_cb(uv_loop_t *loop, uv_signal_t *watcher, int revents);
1507 #endif /* LWS_USE_LIBUV */
1509 LWS_VISIBLE LWS_EXTERN int
1510 lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd);
1512 LWS_VISIBLE LWS_EXTERN int
1513 lws_service_fd_tsi(struct lws_context *context, struct lws_pollfd *pollfd,
1516 LWS_VISIBLE LWS_EXTERN void *
1517 lws_context_user(struct lws_context *context);
1519 LWS_VISIBLE LWS_EXTERN void *
1520 lws_wsi_user(struct lws *wsi);
1523 * NOTE: These public enums are part of the abi. If you want to add one,
1524 * add it at where specified so existing users are unaffected.
1526 enum pending_timeout {
1527 NO_PENDING_TIMEOUT = 0,
1528 PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE = 1,
1529 PENDING_TIMEOUT_AWAITING_CONNECT_RESPONSE = 2,
1530 PENDING_TIMEOUT_ESTABLISH_WITH_SERVER = 3,
1531 PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE = 4,
1532 PENDING_TIMEOUT_AWAITING_PING = 5,
1533 PENDING_TIMEOUT_CLOSE_ACK = 6,
1534 PENDING_TIMEOUT_AWAITING_EXTENSION_CONNECT_RESPONSE = 7,
1535 PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE = 8,
1536 PENDING_TIMEOUT_SSL_ACCEPT = 9,
1537 PENDING_TIMEOUT_HTTP_CONTENT = 10,
1538 PENDING_TIMEOUT_AWAITING_CLIENT_HS_SEND = 11,
1539 PENDING_FLUSH_STORED_SEND_BEFORE_CLOSE = 12,
1540 PENDING_TIMEOUT_SHUTDOWN_FLUSH = 13,
1542 /****** add new things just above ---^ ******/
1545 LWS_VISIBLE LWS_EXTERN void
1546 lws_set_timeout(struct lws *wsi, enum pending_timeout reason, int secs);
1551 * When sending with websocket protocol
1555 * LWS_WRITE_CONTINUATION,
1559 * the send buffer has to have LWS_PRE bytes valid BEFORE
1560 * the buffer pointer you pass to lws_write().
1562 * This allows us to add protocol info before and after the data, and send as
1563 * one packet on the network without payload copying, for maximum efficiency.
1565 * So for example you need this kind of code to use lws_write with a
1568 * char buf[LWS_PRE + 128];
1570 * // fill your part of the buffer... for example here it's all zeros
1571 * memset(&buf[LWS_PRE], 0, 128);
1573 * lws_write(wsi, &buf[LWS_PRE], 128, LWS_WRITE_TEXT);
1575 * When sending HTTP, with
1578 * LWS_WRITE_HTTP_HEADERS
1579 * LWS_WRITE_HTTP_FINAL
1581 * there is no protocol data prepended, and don't need to take care about the
1582 * LWS_PRE bytes valid before the buffer pointer.
1584 * LWS_PRE is at least the frame nonce + 2 header + 8 length
1585 * LWS_SEND_BUFFER_POST_PADDING is deprecated, it's now 0 and can be left off.
1586 * The example apps no longer use it.
1588 * Pad LWS_PRE to the CPU word size, so that word references
1589 * to the address immediately after the padding won't cause an unaligned access
1590 * error. Sometimes for performance reasons the recommended padding is even
1591 * larger than sizeof(void *).
1594 #if !defined(LWS_SIZEOFPTR)
1595 #define LWS_SIZEOFPTR (sizeof (void *))
1597 #if !defined(u_int64_t)
1598 #define u_int64_t unsigned long long
1602 #define _LWS_PAD_SIZE 16 /* Intel recommended for best performance */
1604 #define _LWS_PAD_SIZE LWS_SIZEOFPTR /* Size of a pointer on the target arch */
1606 #define _LWS_PAD(n) (((n) % _LWS_PAD_SIZE) ? \
1607 ((n) + (_LWS_PAD_SIZE - ((n) % _LWS_PAD_SIZE))) : (n))
1608 #define LWS_PRE _LWS_PAD(4 + 10)
1609 /* used prior to 1.7 and retained for backward compatibility */
1610 #define LWS_SEND_BUFFER_PRE_PADDING LWS_PRE
1611 #define LWS_SEND_BUFFER_POST_PADDING 0
1613 LWS_VISIBLE LWS_EXTERN int
1614 lws_write(struct lws *wsi, unsigned char *buf, size_t len,
1615 enum lws_write_protocol protocol);
1618 * lws_close_reason - Set reason and aux data to send with Close packet
1619 * If you are going to return nonzero from the callback
1620 * requesting the connection to close, you can optionally
1621 * call this to set the reason the peer will be told if
1624 * @wsi: The websocket connection to set the close reason on
1625 * @status: A valid close status from websocket standard
1626 * @buf: NULL or buffer containing up to 124 bytes of auxiliary data
1627 * @len: Length of data in @buf to send
1629 LWS_VISIBLE LWS_EXTERN void
1630 lws_close_reason(struct lws *wsi, enum lws_close_status status,
1631 unsigned char *buf, size_t len);
1633 /* helper for case where buffer may be const */
1634 #define lws_write_http(wsi, buf, len) \
1635 lws_write(wsi, (unsigned char *)(buf), len, LWS_WRITE_HTTP)
1637 LWS_VISIBLE LWS_EXTERN int
1638 lws_serve_http_file(struct lws *wsi, const char *file, const char *content_type,
1639 const char *other_headers, int other_headers_len);
1640 LWS_VISIBLE LWS_EXTERN int
1641 lws_serve_http_file_fragment(struct lws *wsi);
1643 LWS_VISIBLE LWS_EXTERN int
1644 lws_return_http_status(struct lws *wsi, unsigned int code,
1645 const char *html_body);
1647 LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
1648 lws_get_protocol(struct lws *wsi);
1650 LWS_VISIBLE LWS_EXTERN int
1651 lws_callback_on_writable(struct lws *wsi);
1653 LWS_VISIBLE LWS_EXTERN int
1654 lws_callback_on_writable_all_protocol(const struct lws_context *context,
1655 const struct lws_protocols *protocol);
1657 LWS_VISIBLE LWS_EXTERN int
1658 lws_callback_all_protocol(struct lws_context *context,
1659 const struct lws_protocols *protocol, int reason);
1661 LWS_VISIBLE LWS_EXTERN int
1662 lws_get_socket_fd(struct lws *wsi);
1664 LWS_VISIBLE LWS_EXTERN int
1665 lws_is_final_fragment(struct lws *wsi);
1667 LWS_VISIBLE LWS_EXTERN unsigned char
1668 lws_get_reserved_bits(struct lws *wsi);
1670 LWS_VISIBLE LWS_EXTERN int
1671 lws_rx_flow_control(struct lws *wsi, int enable);
1673 LWS_VISIBLE LWS_EXTERN void
1674 lws_rx_flow_allow_all_protocol(const struct lws_context *context,
1675 const struct lws_protocols *protocol);
1677 LWS_VISIBLE LWS_EXTERN size_t
1678 lws_remaining_packet_payload(struct lws *wsi);
1681 * if the protocol does not have any guidance, returns -1. Currently only
1682 * http2 connections get send window information from this API. But your code
1683 * should use it so it can work properly with any protocol.
1685 * If nonzero return is the amount of payload data the peer or intermediary has
1686 * reported it has buffer space for. That has NO relationship with the amount
1687 * of buffer space your OS can accept on this connection for a write action.
1689 * This number represents the maximum you could send to the peer or intermediary
1690 * on this connection right now without it complaining.
1692 * lws manages accounting for send window updates and payload writes
1693 * automatically, so this number reflects the situation at the peer or
1694 * intermediary dynamically.
1696 LWS_VISIBLE LWS_EXTERN size_t
1697 lws_get_peer_write_allowance(struct lws *wsi);
1699 /* deprecated, use lws_client_connect_via_info() */
1700 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1701 lws_client_connect(struct lws_context *clients, const char *address,
1702 int port, int ssl_connection, const char *path,
1703 const char *host, const char *origin, const char *protocol,
1704 int ietf_version_or_minus_one) LWS_WARN_DEPRECATED;
1705 /* deprecated, use lws_client_connect_via_info() */
1706 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1707 lws_client_connect_extended(struct lws_context *clients, const char *address,
1708 int port, int ssl_connection, const char *path,
1709 const char *host, const char *origin,
1710 const char *protocol, int ietf_version_or_minus_one,
1711 void *userdata) LWS_WARN_DEPRECATED;
1713 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1714 lws_client_connect_via_info(struct lws_client_connect_info * ccinfo);
1716 LWS_VISIBLE LWS_EXTERN struct lws *
1717 lws_adopt_socket(struct lws_context *context, lws_sockfd_type accept_fd);
1719 LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
1720 lws_canonical_hostname(struct lws_context *context);
1723 LWS_VISIBLE LWS_EXTERN void
1724 lws_get_peer_addresses(struct lws *wsi, lws_sockfd_type fd, char *name,
1725 int name_len, char *rip, int rip_len);
1727 LWS_VISIBLE LWS_EXTERN int
1728 lws_get_random(struct lws_context *context, void *buf, int len);
1730 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1731 lws_daemonize(const char *_lock_path);
1733 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1734 lws_send_pipe_choked(struct lws *wsi);
1736 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1737 lws_partial_buffered(struct lws *wsi);
1739 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1740 lws_frame_is_binary(struct lws *wsi);
1742 LWS_VISIBLE LWS_EXTERN int
1743 lws_is_ssl(struct lws *wsi);
1744 #ifdef LWS_SHA1_USE_OPENSSL_NAME
1745 #define lws_SHA1 SHA1
1747 LWS_VISIBLE LWS_EXTERN unsigned char *
1748 lws_SHA1(const unsigned char *d, size_t n, unsigned char *md);
1751 LWS_VISIBLE LWS_EXTERN int
1752 lws_b64_encode_string(const char *in, int in_len, char *out, int out_size);
1754 LWS_VISIBLE LWS_EXTERN int
1755 lws_b64_decode_string(const char *in, char *out, int out_size);
1757 LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
1758 lws_get_library_version(void);
1760 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1761 lws_parse_uri(char *p, const char **prot, const char **ads, int *port,
1765 * Access to http headers
1767 * In lws the client http headers are temporarily malloc'd only for the
1768 * duration of the http part of the handshake. It's because in most cases,
1769 * the header content is ignored for the whole rest of the connection lifetime
1770 * and would then just be taking up space needlessly.
1772 * During LWS_CALLBACK_HTTP when the URI path is delivered is the last time
1773 * the http headers are still allocated, you can use these apis then to
1774 * look at and copy out interesting header content (cookies, etc)
1776 * Notice that the header total length reported does not include a terminating
1777 * '\0', however you must allocate for it when using the _copy apis. So the
1778 * length reported for a header containing "123" is 3, but you must provide
1779 * a buffer of length 4 so that "123\0" may be copied into it, or the copy
1780 * will fail with a nonzero return code.
1783 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1784 lws_hdr_total_length(struct lws *wsi, enum lws_token_indexes h);
1786 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1787 lws_hdr_fragment_length(struct lws *wsi, enum lws_token_indexes h, int frag_idx);
1790 * copies the whole, aggregated header, even if it was delivered in
1791 * several actual headers piece by piece
1793 LWS_VISIBLE LWS_EXTERN int
1794 lws_hdr_copy(struct lws *wsi, char *dest, int len, enum lws_token_indexes h);
1797 * copies only fragment frag_idx of a header. Normally this is only useful
1798 * to parse URI arguments like ?x=1&y=2, token index WSI_TOKEN_HTTP_URI_ARGS
1799 * fragment 0 will contain "x=1" and fragment 1 "y=2"
1801 LWS_VISIBLE LWS_EXTERN int
1802 lws_hdr_copy_fragment(struct lws *wsi, char *dest, int len,
1803 enum lws_token_indexes h, int frag_idx);
1806 /* get the active file operations struct */
1807 LWS_VISIBLE LWS_EXTERN struct lws_plat_file_ops * LWS_WARN_UNUSED_RESULT
1808 lws_get_fops(struct lws_context *context);
1810 LWS_VISIBLE LWS_EXTERN struct lws_context * LWS_WARN_UNUSED_RESULT
1811 lws_get_context(const struct lws *wsi);
1813 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1814 lws_get_count_threads(struct lws_context *context);
1817 * Wsi-associated File Operations access helpers
1819 * Use these helper functions if you want to access a file from the perspective
1820 * of a specific wsi, which is usually the case. If you just want contextless
1821 * file access, use the fops callbacks directly with NULL wsi instead of these
1824 * If so, then it calls the platform handler or user overrides where present
1825 * (as defined in info->fops)
1827 * The advantage from all this is user code can be portable for file operations
1828 * without having to deal with differences between platforms.
1831 static LWS_INLINE lws_filefd_type LWS_WARN_UNUSED_RESULT
1832 lws_plat_file_open(struct lws *wsi, const char *filename,
1833 unsigned long *filelen, int flags)
1835 return lws_get_fops(lws_get_context(wsi))->open(wsi, filename,
1839 static LWS_INLINE int
1840 lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
1842 return lws_get_fops(lws_get_context(wsi))->close(wsi, fd);
1845 static LWS_INLINE unsigned long
1846 lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
1848 return lws_get_fops(lws_get_context(wsi))->seek_cur(wsi, fd, offset);
1851 static LWS_INLINE int LWS_WARN_UNUSED_RESULT
1852 lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
1853 unsigned char *buf, unsigned long len)
1855 return lws_get_fops(lws_get_context(wsi))->read(wsi, fd, amount, buf,
1859 static LWS_INLINE int LWS_WARN_UNUSED_RESULT
1860 lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
1861 unsigned char *buf, unsigned long len)
1863 return lws_get_fops(lws_get_context(wsi))->write(wsi, fd, amount, buf,
1868 * Note: this is not normally needed as a user api. It's provided in case it is
1869 * useful when integrating with other app poll loop service code.
1871 LWS_VISIBLE LWS_EXTERN int
1872 lws_read(struct lws *wsi, unsigned char *buf, size_t len);
1874 #ifndef LWS_NO_EXTENSIONS
1877 * There is no longer a set internal extensions table. The table is provided
1878 * by user code along with application-specific settings. See the test
1879 * client and server for how to do.
1881 static LWS_INLINE LWS_WARN_DEPRECATED const struct lws_extension *
1882 lws_get_internal_extensions() { return NULL; }
1883 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1884 lws_ext_parse_options(const struct lws_extension *ext, struct lws *wsi,
1885 void *ext_user, const struct lws_ext_options *opts,
1886 const char *o, int len);
1890 * custom allocator support
1892 LWS_VISIBLE LWS_EXTERN void
1893 lws_set_allocator(void *(*realloc)(void *ptr, size_t size));