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
128 #define LWS_EXTERN extern __declspec(dllexport)
130 #define LWS_EXTERN extern __declspec(dllimport)
136 #define LWS_INVALID_FILE INVALID_HANDLE_VALUE
137 #define LWS_O_RDONLY _O_RDONLY
139 #else /* NOT WIN32 */
142 #define LWS_INLINE inline
143 #define LWS_O_RDONLY O_RDONLY
145 #ifndef MBED_OPERATORS
148 #define LWS_INVALID_FILE -1
150 #define getdtablesize() (20)
151 #define LWS_INVALID_FILE NULL
154 #if defined(__GNUC__)
155 #define LWS_VISIBLE __attribute__((visibility("default")))
156 #define LWS_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))
159 #define LWS_WARN_UNUSED_RESULT
162 #if defined(__ANDROID__)
163 #define getdtablesize() 1024
170 #endif /* LWS_USE_LIBEV */
173 #define LWS_EXTERN extern
179 #include <sys/time.h>
183 #ifdef LWS_OPENSSL_SUPPORT
185 #ifdef USE_OLD_CYASSL
186 #include <cyassl/openssl/ssl.h>
188 #include <wolfssl/openssl/ssl.h>
189 #endif /* not USE_OLD_CYASSL */
191 #include <openssl/ssl.h>
192 #endif /* not USE_WOLFSSL */
195 #define CONTEXT_PORT_NO_LISTEN -1
197 enum lws_log_levels {
207 LLL_LATENCY = 1 << 9,
209 LLL_COUNT = 10 /* set to count of valid flags */
212 LWS_VISIBLE LWS_EXTERN void _lws_log(int filter, const char *format, ...);
213 LWS_VISIBLE LWS_EXTERN void _lws_logv(int filter, const char *format, va_list vl);
215 /* notice, warn and log are always compiled in */
216 #define lwsl_notice(...) _lws_log(LLL_NOTICE, __VA_ARGS__)
217 #define lwsl_warn(...) _lws_log(LLL_WARN, __VA_ARGS__)
218 #define lwsl_err(...) _lws_log(LLL_ERR, __VA_ARGS__)
220 * weaker logging can be deselected at configure time using --disable-debug
221 * that gets rid of the overhead of checking while keeping _warn and _err
226 #define lwsl_info(...) _lws_log(LLL_INFO, __VA_ARGS__)
227 #define lwsl_debug(...) _lws_log(LLL_DEBUG, __VA_ARGS__)
228 #define lwsl_parser(...) _lws_log(LLL_PARSER, __VA_ARGS__)
229 #define lwsl_header(...) _lws_log(LLL_HEADER, __VA_ARGS__)
230 #define lwsl_ext(...) _lws_log(LLL_EXT, __VA_ARGS__)
231 #define lwsl_client(...) _lws_log(LLL_CLIENT, __VA_ARGS__)
232 #define lwsl_latency(...) _lws_log(LLL_LATENCY, __VA_ARGS__)
233 LWS_VISIBLE LWS_EXTERN void lwsl_hexdump(void *buf, size_t len);
237 #define lwsl_info(...) {}
238 #define lwsl_debug(...) {}
239 #define lwsl_parser(...) {}
240 #define lwsl_header(...) {}
241 #define lwsl_ext(...) {}
242 #define lwsl_client(...) {}
243 #define lwsl_latency(...) {}
244 #define lwsl_hexdump(a, b)
248 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
250 /* api change list for user code to test against */
252 #define LWS_FEATURE_SERVE_HTTP_FILE_HAS_OTHER_HEADERS_ARG
254 /* the struct lws_protocols has the id field present */
255 #define LWS_FEATURE_PROTOCOLS_HAS_ID_FIELD
257 /* you can call lws_get_peer_write_allowance */
258 #define LWS_FEATURE_PROTOCOLS_HAS_PEER_WRITE_ALLOWANCE
260 /* extra parameter introduced in 917f43ab821 */
261 #define LWS_FEATURE_SERVE_HTTP_FILE_HAS_OTHER_HEADERS_LEN
263 /* File operations stuff exists */
264 #define LWS_FEATURE_FOPS
267 * NOTE: These public enums are part of the abi. If you want to add one,
268 * add it at where specified so existing users are unaffected.
270 enum lws_context_options {
271 LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT = (1 << 1),
272 LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME = (1 << 2),
273 LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT = (1 << 3),
274 LWS_SERVER_OPTION_LIBEV = (1 << 4),
275 LWS_SERVER_OPTION_DISABLE_IPV6 = (1 << 5),
276 LWS_SERVER_OPTION_DISABLE_OS_CA_CERTS = (1 << 6),
277 LWS_SERVER_OPTION_PEER_CERT_NOT_REQUIRED = (1 << 7),
278 LWS_SERVER_OPTION_VALIDATE_UTF8 = (1 << 8),
279 LWS_SERVER_OPTION_SSL_ECDH = (1 << 9),
281 /****** add new things just above ---^ ******/
285 * NOTE: These public enums are part of the abi. If you want to add one,
286 * add it at where specified so existing users are unaffected.
288 enum lws_callback_reasons {
289 LWS_CALLBACK_ESTABLISHED = 0,
290 LWS_CALLBACK_CLIENT_CONNECTION_ERROR = 1,
291 LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH = 2,
292 LWS_CALLBACK_CLIENT_ESTABLISHED = 3,
293 LWS_CALLBACK_CLOSED = 4,
294 LWS_CALLBACK_CLOSED_HTTP = 5,
295 LWS_CALLBACK_RECEIVE = 6,
296 LWS_CALLBACK_RECEIVE_PONG = 7,
297 LWS_CALLBACK_CLIENT_RECEIVE = 8,
298 LWS_CALLBACK_CLIENT_RECEIVE_PONG = 9,
299 LWS_CALLBACK_CLIENT_WRITEABLE = 10,
300 LWS_CALLBACK_SERVER_WRITEABLE = 11,
301 LWS_CALLBACK_HTTP = 12,
302 LWS_CALLBACK_HTTP_BODY = 13,
303 LWS_CALLBACK_HTTP_BODY_COMPLETION = 14,
304 LWS_CALLBACK_HTTP_FILE_COMPLETION = 15,
305 LWS_CALLBACK_HTTP_WRITEABLE = 16,
306 LWS_CALLBACK_FILTER_NETWORK_CONNECTION = 17,
307 LWS_CALLBACK_FILTER_HTTP_CONNECTION = 18,
308 LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED = 19,
309 LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION = 20,
310 LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS = 21,
311 LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS = 22,
312 LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION = 23,
313 LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER = 24,
314 LWS_CALLBACK_CONFIRM_EXTENSION_OKAY = 25,
315 LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED = 26,
316 LWS_CALLBACK_PROTOCOL_INIT = 27,
317 LWS_CALLBACK_PROTOCOL_DESTROY = 28,
318 LWS_CALLBACK_WSI_CREATE /* always protocol[0] */ = 29,
319 LWS_CALLBACK_WSI_DESTROY /* always protocol[0] */ = 30,
320 LWS_CALLBACK_GET_THREAD_ID = 31,
322 /* external poll() management support */
323 LWS_CALLBACK_ADD_POLL_FD = 32,
324 LWS_CALLBACK_DEL_POLL_FD = 33,
325 LWS_CALLBACK_CHANGE_MODE_POLL_FD = 34,
326 LWS_CALLBACK_LOCK_POLL = 35,
327 LWS_CALLBACK_UNLOCK_POLL = 36,
329 LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY = 37,
330 LWS_CALLBACK_WS_PEER_INITIATED_CLOSE = 38,
332 LWS_CALLBACK_WS_EXT_DEFAULTS = 39,
334 /****** add new things just above ---^ ******/
336 LWS_CALLBACK_USER = 1000, /* user code can use any including / above */
341 typedef SOCKET lws_sockfd_type;
342 typedef HANDLE lws_filefd_type;
343 #define lws_sockfd_valid(sfd) (!!sfd)
351 #if defined(MBED_OPERATORS)
352 /* it's a class lws_conn * */
353 typedef void * lws_sockfd_type;
354 typedef void * lws_filefd_type;
355 #define lws_sockfd_valid(sfd) (!!sfd)
361 #define POLLIN 0x0001
362 #define POLLPRI 0x0002
363 #define POLLOUT 0x0004
364 #define POLLERR 0x0008
365 #define POLLHUP 0x0010
366 #define POLLNVAL 0x0020
370 void * mbed3_create_tcp_stream_socket(void);
371 void mbed3_delete_tcp_stream_socket(void *sockfd);
372 void mbed3_tcp_stream_bind(void *sock, int port, struct lws *);
373 void mbed3_tcp_stream_accept(void *sock, struct lws *);
375 typedef int lws_sockfd_type;
376 typedef int lws_filefd_type;
377 #define lws_sockfd_valid(sfd) (sfd >= 0)
380 #define lws_pollfd pollfd
383 /* argument structure for all external poll related calls
386 struct lws_pollargs {
387 lws_sockfd_type fd; /* applicable socket descriptor */
388 int events; /* the new event mask */
389 int prev_events; /* the previous event mask */
393 * struct lws_plat_file_ops - Platform-specific file operations
395 * These provide platform-agnostic ways to deal with filesystem access in the
396 * library and in the user code.
398 * @open: Open file (always binary access if plat supports it)
399 * filelen is filled on exit to be the length of the file
400 * flags should be set to O_RDONLY or O_RDWR
402 * @seek_cur: Seek from current position
403 * @read: Read fron file *amount is set on exit to amount read
404 * @write: Write to file *amount is set on exit as amount written
406 struct lws_plat_file_ops {
407 lws_filefd_type (*open)(struct lws *wsi, const char *filename,
408 unsigned long *filelen, int flags);
409 int (*close)(struct lws *wsi, lws_filefd_type fd);
410 unsigned long (*seek_cur)(struct lws *wsi, lws_filefd_type fd,
411 long offset_from_cur_pos);
412 int (*read)(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
413 unsigned char *buf, unsigned long len);
414 int (*write)(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
415 unsigned char *buf, unsigned long len);
417 /* Add new things just above here ---^
418 * This is part of the ABI, don't needlessly break compatibilty */
422 * NOTE: These public enums are part of the abi. If you want to add one,
423 * add it at where specified so existing users are unaffected.
425 enum lws_extension_callback_reasons {
426 LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT = 0,
427 LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT = 1,
428 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT = 2,
429 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT = 3,
430 LWS_EXT_CB_CONSTRUCT = 4,
431 LWS_EXT_CB_CLIENT_CONSTRUCT = 5,
432 LWS_EXT_CB_CHECK_OK_TO_REALLY_CLOSE = 6,
433 LWS_EXT_CB_CHECK_OK_TO_PROPOSE_EXTENSION = 7,
434 LWS_EXT_CB_DESTROY = 8,
435 LWS_EXT_CB_DESTROY_ANY_WSI_CLOSING = 9,
436 LWS_EXT_CB_ANY_WSI_ESTABLISHED = 10,
437 LWS_EXT_CB_PACKET_RX_PREPARSE = 11,
438 LWS_EXT_CB_PACKET_TX_PRESEND = 12,
439 LWS_EXT_CB_PACKET_TX_DO_SEND = 13,
440 LWS_EXT_CB_HANDSHAKE_REPLY_TX = 14,
441 LWS_EXT_CB_FLUSH_PENDING_TX = 15,
442 LWS_EXT_CB_EXTENDED_PAYLOAD_RX = 16,
443 LWS_EXT_CB_CAN_PROXY_CLIENT_CONNECTION = 17,
445 LWS_EXT_CB_REQUEST_ON_WRITEABLE = 19,
446 LWS_EXT_CB_IS_WRITEABLE = 20,
447 LWS_EXT_CB_PAYLOAD_TX = 21,
448 LWS_EXT_CB_PAYLOAD_RX = 22,
449 LWS_EXT_CB_OPTION_DEFAULT = 23,
450 LWS_EXT_CB_OPTION_SET = 24,
451 LWS_EXT_CB_OPTION_CONFIRM = 25,
453 /****** add new things just above ---^ ******/
457 * NOTE: These public enums are part of the abi. If you want to add one,
458 * add it at where specified so existing users are unaffected.
460 enum lws_write_protocol {
462 LWS_WRITE_BINARY = 1,
463 LWS_WRITE_CONTINUATION = 2,
466 /* special 04+ opcodes */
468 /* LWS_WRITE_CLOSE is handled by lws_close_reason() */
472 /* Same as write_http but we know this write ends the transaction */
473 LWS_WRITE_HTTP_FINAL = 7,
477 LWS_WRITE_HTTP_HEADERS = 8,
479 /****** add new things just above ---^ ******/
483 LWS_WRITE_NO_FIN = 0x40,
485 * client packet payload goes out on wire unmunged
486 * only useful for security tests since normal servers cannot
487 * decode the content if used
489 LWS_WRITE_CLIENT_IGNORE_XOR_MASK = 0x80
493 * you need these to look at headers that have been parsed if using the
494 * LWS_CALLBACK_FILTER_CONNECTION callback. If a header from the enum
495 * list below is absent, .token = NULL and token_len = 0. Otherwise .token
496 * points to .token_len chars containing that header content.
505 * these have to be kept in sync with lextable.h / minilex.c
507 * NOTE: These public enums are part of the abi. If you want to add one,
508 * add it at where specified so existing users are unaffected.
510 enum lws_token_indexes {
511 WSI_TOKEN_GET_URI = 0,
512 WSI_TOKEN_POST_URI = 1,
513 WSI_TOKEN_OPTIONS_URI = 2,
515 WSI_TOKEN_CONNECTION = 4,
516 WSI_TOKEN_UPGRADE = 5,
517 WSI_TOKEN_ORIGIN = 6,
519 WSI_TOKEN_CHALLENGE = 8,
520 WSI_TOKEN_EXTENSIONS = 9,
523 WSI_TOKEN_PROTOCOL = 12,
524 WSI_TOKEN_ACCEPT = 13,
525 WSI_TOKEN_NONCE = 14,
527 WSI_TOKEN_HTTP2_SETTINGS = 16,
528 WSI_TOKEN_HTTP_ACCEPT = 17,
529 WSI_TOKEN_HTTP_AC_REQUEST_HEADERS = 18,
530 WSI_TOKEN_HTTP_IF_MODIFIED_SINCE = 19,
531 WSI_TOKEN_HTTP_IF_NONE_MATCH = 20,
532 WSI_TOKEN_HTTP_ACCEPT_ENCODING = 21,
533 WSI_TOKEN_HTTP_ACCEPT_LANGUAGE = 22,
534 WSI_TOKEN_HTTP_PRAGMA = 23,
535 WSI_TOKEN_HTTP_CACHE_CONTROL = 24,
536 WSI_TOKEN_HTTP_AUTHORIZATION = 25,
537 WSI_TOKEN_HTTP_COOKIE = 26,
538 WSI_TOKEN_HTTP_CONTENT_LENGTH = 27,
539 WSI_TOKEN_HTTP_CONTENT_TYPE = 28,
540 WSI_TOKEN_HTTP_DATE = 29,
541 WSI_TOKEN_HTTP_RANGE = 30,
542 WSI_TOKEN_HTTP_REFERER = 31,
544 WSI_TOKEN_VERSION = 33,
545 WSI_TOKEN_SWORIGIN = 34,
547 WSI_TOKEN_HTTP_COLON_AUTHORITY = 35,
548 WSI_TOKEN_HTTP_COLON_METHOD = 36,
549 WSI_TOKEN_HTTP_COLON_PATH = 37,
550 WSI_TOKEN_HTTP_COLON_SCHEME = 38,
551 WSI_TOKEN_HTTP_COLON_STATUS = 39,
553 WSI_TOKEN_HTTP_ACCEPT_CHARSET = 40,
554 WSI_TOKEN_HTTP_ACCEPT_RANGES = 41,
555 WSI_TOKEN_HTTP_ACCESS_CONTROL_ALLOW_ORIGIN = 42,
556 WSI_TOKEN_HTTP_AGE = 43,
557 WSI_TOKEN_HTTP_ALLOW = 44,
558 WSI_TOKEN_HTTP_CONTENT_DISPOSITION = 45,
559 WSI_TOKEN_HTTP_CONTENT_ENCODING = 46,
560 WSI_TOKEN_HTTP_CONTENT_LANGUAGE = 47,
561 WSI_TOKEN_HTTP_CONTENT_LOCATION = 48,
562 WSI_TOKEN_HTTP_CONTENT_RANGE = 49,
563 WSI_TOKEN_HTTP_ETAG = 50,
564 WSI_TOKEN_HTTP_EXPECT = 51,
565 WSI_TOKEN_HTTP_EXPIRES = 52,
566 WSI_TOKEN_HTTP_FROM = 53,
567 WSI_TOKEN_HTTP_IF_MATCH = 54,
568 WSI_TOKEN_HTTP_IF_RANGE = 55,
569 WSI_TOKEN_HTTP_IF_UNMODIFIED_SINCE = 56,
570 WSI_TOKEN_HTTP_LAST_MODIFIED = 57,
571 WSI_TOKEN_HTTP_LINK = 58,
572 WSI_TOKEN_HTTP_LOCATION = 59,
573 WSI_TOKEN_HTTP_MAX_FORWARDS = 60,
574 WSI_TOKEN_HTTP_PROXY_AUTHENTICATE = 61,
575 WSI_TOKEN_HTTP_PROXY_AUTHORIZATION = 62,
576 WSI_TOKEN_HTTP_REFRESH = 63,
577 WSI_TOKEN_HTTP_RETRY_AFTER = 64,
578 WSI_TOKEN_HTTP_SERVER = 65,
579 WSI_TOKEN_HTTP_SET_COOKIE = 66,
580 WSI_TOKEN_HTTP_STRICT_TRANSPORT_SECURITY = 67,
581 WSI_TOKEN_HTTP_TRANSFER_ENCODING = 68,
582 WSI_TOKEN_HTTP_USER_AGENT = 69,
583 WSI_TOKEN_HTTP_VARY = 70,
584 WSI_TOKEN_HTTP_VIA = 71,
585 WSI_TOKEN_HTTP_WWW_AUTHENTICATE = 72,
587 WSI_TOKEN_PATCH_URI = 73,
588 WSI_TOKEN_PUT_URI = 74,
589 WSI_TOKEN_DELETE_URI = 75,
591 WSI_TOKEN_HTTP_URI_ARGS = 76,
592 WSI_TOKEN_PROXY = 77,
593 WSI_TOKEN_HTTP_X_REAL_IP = 78,
595 /****** add new things just above ---^ ******/
597 /* use token storage to stash these internally, not for
600 _WSI_TOKEN_CLIENT_SENT_PROTOCOLS,
601 _WSI_TOKEN_CLIENT_PEER_ADDRESS,
602 _WSI_TOKEN_CLIENT_URI,
603 _WSI_TOKEN_CLIENT_HOST,
604 _WSI_TOKEN_CLIENT_ORIGIN,
606 /* always last real token index*/
609 /* parser state additions */
612 WSI_TOKEN_SKIPPING_SAW_CR,
613 WSI_PARSING_COMPLETE,
614 WSI_INIT_TOKEN_MUXURL,
617 struct lws_token_limits {
618 unsigned short token_limit[WSI_TOKEN_COUNT];
625 1000 indicates a normal closure, meaning that the purpose for
626 which the connection was established has been fulfilled.
630 1001 indicates that an endpoint is "going away", such as a server
631 going down or a browser having navigated away from a page.
635 1002 indicates that an endpoint is terminating the connection due
640 1003 indicates that an endpoint is terminating the connection
641 because it has received a type of data it cannot accept (e.g., an
642 endpoint that understands only text data MAY send this if it
643 receives a binary message).
647 Reserved. The specific meaning might be defined in the future.
651 1005 is a reserved value and MUST NOT be set as a status code in a
652 Close control frame by an endpoint. It is designated for use in
653 applications expecting a status code to indicate that no status
654 code was actually present.
658 1006 is a reserved value and MUST NOT be set as a status code in a
659 Close control frame by an endpoint. It is designated for use in
660 applications expecting a status code to indicate that the
661 connection was closed abnormally, e.g., without sending or
662 receiving a Close control frame.
666 1007 indicates that an endpoint is terminating the connection
667 because it has received data within a message that was not
668 consistent with the type of the message (e.g., non-UTF-8 [RFC3629]
669 data within a text message).
673 1008 indicates that an endpoint is terminating the connection
674 because it has received a message that violates its policy. This
675 is a generic status code that can be returned when there is no
676 other more suitable status code (e.g., 1003 or 1009) or if there
677 is a need to hide specific details about the policy.
681 1009 indicates that an endpoint is terminating the connection
682 because it has received a message that is too big for it to
687 1010 indicates that an endpoint (client) is terminating the
688 connection because it has expected the server to negotiate one or
689 more extension, but the server didn't return them in the response
690 message of the WebSocket handshake. The list of extensions that
691 are needed SHOULD appear in the /reason/ part of the Close frame.
692 Note that this status code is not used by the server, because it
693 can fail the WebSocket handshake instead.
697 1011 indicates that a server is terminating the connection because
698 it encountered an unexpected condition that prevented it from
699 fulfilling the request.
703 1015 is a reserved value and MUST NOT be set as a status code in a
704 Close control frame by an endpoint. It is designated for use in
705 applications expecting a status code to indicate that the
706 connection was closed due to a failure to perform a TLS handshake
707 (e.g., the server certificate can't be verified).
711 * NOTE: These public enums are part of the abi. If you want to add one,
712 * add it at where specified so existing users are unaffected.
714 enum lws_close_status {
715 LWS_CLOSE_STATUS_NOSTATUS = 0,
716 LWS_CLOSE_STATUS_NORMAL = 1000,
717 LWS_CLOSE_STATUS_GOINGAWAY = 1001,
718 LWS_CLOSE_STATUS_PROTOCOL_ERR = 1002,
719 LWS_CLOSE_STATUS_UNACCEPTABLE_OPCODE = 1003,
720 LWS_CLOSE_STATUS_RESERVED = 1004,
721 LWS_CLOSE_STATUS_NO_STATUS = 1005,
722 LWS_CLOSE_STATUS_ABNORMAL_CLOSE = 1006,
723 LWS_CLOSE_STATUS_INVALID_PAYLOAD = 1007,
724 LWS_CLOSE_STATUS_POLICY_VIOLATION = 1008,
725 LWS_CLOSE_STATUS_MESSAGE_TOO_LARGE = 1009,
726 LWS_CLOSE_STATUS_EXTENSION_REQUIRED = 1010,
727 LWS_CLOSE_STATUS_UNEXPECTED_CONDITION = 1011,
728 LWS_CLOSE_STATUS_TLS_FAILURE = 1015,
730 /****** add new things just above ---^ ******/
732 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY = 9999,
736 HTTP_STATUS_OK = 200,
737 HTTP_STATUS_NO_CONTENT = 204,
739 HTTP_STATUS_BAD_REQUEST = 400,
740 HTTP_STATUS_UNAUTHORIZED,
741 HTTP_STATUS_PAYMENT_REQUIRED,
742 HTTP_STATUS_FORBIDDEN,
743 HTTP_STATUS_NOT_FOUND,
744 HTTP_STATUS_METHOD_NOT_ALLOWED,
745 HTTP_STATUS_NOT_ACCEPTABLE,
746 HTTP_STATUS_PROXY_AUTH_REQUIRED,
747 HTTP_STATUS_REQUEST_TIMEOUT,
748 HTTP_STATUS_CONFLICT,
750 HTTP_STATUS_LENGTH_REQUIRED,
751 HTTP_STATUS_PRECONDITION_FAILED,
752 HTTP_STATUS_REQ_ENTITY_TOO_LARGE,
753 HTTP_STATUS_REQ_URI_TOO_LONG,
754 HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE,
755 HTTP_STATUS_REQ_RANGE_NOT_SATISFIABLE,
756 HTTP_STATUS_EXPECTATION_FAILED,
758 HTTP_STATUS_INTERNAL_SERVER_ERROR = 500,
759 HTTP_STATUS_NOT_IMPLEMENTED,
760 HTTP_STATUS_BAD_GATEWAY,
761 HTTP_STATUS_SERVICE_UNAVAILABLE,
762 HTTP_STATUS_GATEWAY_TIMEOUT,
763 HTTP_STATUS_HTTP_VERSION_NOT_SUPPORTED,
768 /* needed even with extensions disabled for create context */
769 struct lws_extension;
772 * typedef lws_callback_function() - User server actions
773 * @wsi: Opaque websocket instance pointer
774 * @reason: The reason for the call
775 * @user: Pointer to per-session user data allocated by library
776 * @in: Pointer used for some callback reasons
777 * @len: Length set for some callback reasons
779 * This callback is the way the user controls what is served. All the
780 * protocol detail is hidden and handled by the library.
782 * For each connection / session there is user data allocated that is
783 * pointed to by "user". You set the size of this user data area when
784 * the library is initialized with lws_create_server.
786 * You get an opportunity to initialize user data when called back with
787 * LWS_CALLBACK_ESTABLISHED reason.
789 * LWS_CALLBACK_ESTABLISHED: after the server completes a handshake with
790 * an incoming client. If you built the library
791 * with ssl support, @in is a pointer to the
792 * ssl struct associated with the connection or
795 * LWS_CALLBACK_CLIENT_CONNECTION_ERROR: the request client connection has
796 * been unable to complete a handshake with the remote server. If
797 * in is non-NULL, you can find an error string of length len where
800 * LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH: this is the last chance for the
801 * client user code to examine the http headers
802 * and decide to reject the connection. If the
803 * content in the headers is interesting to the
804 * client (url, etc) it needs to copy it out at
805 * this point since it will be destroyed before
806 * the CLIENT_ESTABLISHED call
808 * LWS_CALLBACK_CLIENT_ESTABLISHED: after your client connection completed
809 * a handshake with the remote server
811 * LWS_CALLBACK_CLOSED: when the websocket session ends
813 * LWS_CALLBACK_CLOSED_HTTP: when a HTTP (non-websocket) session ends
815 * LWS_CALLBACK_RECEIVE: data has appeared for this server endpoint from a
816 * remote client, it can be found at *in and is
819 * LWS_CALLBACK_CLIENT_RECEIVE_PONG: if you elected to see PONG packets,
820 * they appear with this callback reason. PONG
821 * packets only exist in 04+ protocol
823 * LWS_CALLBACK_CLIENT_RECEIVE: data has appeared from the server for the
824 * client connection, it can be found at *in and
827 * LWS_CALLBACK_HTTP: an http request has come from a client that is not
828 * asking to upgrade the connection to a websocket
829 * one. This is a chance to serve http content,
830 * for example, to send a script to the client
831 * which will then open the websockets connection.
832 * @in points to the URI path requested and
833 * lws_serve_http_file() makes it very
834 * simple to send back a file to the client.
835 * Normally after sending the file you are done
836 * with the http connection, since the rest of the
837 * activity will come by websockets from the script
838 * that was delivered by http, so you will want to
839 * return 1; to close and free up the connection.
840 * That's important because it uses a slot in the
841 * total number of client connections allowed set
844 * LWS_CALLBACK_HTTP_BODY: the next @len bytes data from the http
845 * request body HTTP connection is now available in @in.
847 * LWS_CALLBACK_HTTP_BODY_COMPLETION: the expected amount of http request
848 * body has been delivered
850 * LWS_CALLBACK_HTTP_WRITEABLE: you can write more down the http protocol
853 * LWS_CALLBACK_HTTP_FILE_COMPLETION: a file requested to be send down
854 * http link has completed.
856 * LWS_CALLBACK_CLIENT_WRITEABLE:
857 * LWS_CALLBACK_SERVER_WRITEABLE: If you call
858 * lws_callback_on_writable() on a connection, you will
859 * get one of these callbacks coming when the connection socket
860 * is able to accept another write packet without blocking.
861 * If it already was able to take another packet without blocking,
862 * you'll get this callback at the next call to the service loop
863 * function. Notice that CLIENTs get LWS_CALLBACK_CLIENT_WRITEABLE
864 * and servers get LWS_CALLBACK_SERVER_WRITEABLE.
866 * LWS_CALLBACK_FILTER_NETWORK_CONNECTION: called when a client connects to
867 * the server at network level; the connection is accepted but then
868 * passed to this callback to decide whether to hang up immediately
869 * or not, based on the client IP. @in contains the connection
870 * socket's descriptor. Since the client connection information is
871 * not available yet, @wsi still pointing to the main server socket.
872 * Return non-zero to terminate the connection before sending or
873 * receiving anything. Because this happens immediately after the
874 * network connection from the client, there's no websocket protocol
875 * selected yet so this callback is issued only to protocol 0.
877 * LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED: A new client just had
878 * been connected, accepted, and instantiated into the pool. This
879 * callback allows setting any relevant property to it. Because this
880 * happens immediately after the instantiation of a new client,
881 * there's no websocket protocol selected yet so this callback is
882 * issued only to protocol 0. Only @wsi is defined, pointing to the
883 * new client, and the return value is ignored.
885 * LWS_CALLBACK_FILTER_HTTP_CONNECTION: called when the request has
886 * been received and parsed from the client, but the response is
887 * not sent yet. Return non-zero to disallow the connection.
888 * @user is a pointer to the connection user space allocation,
889 * @in is the URI, eg, "/"
890 * In your handler you can use the public APIs
891 * lws_hdr_total_length() / lws_hdr_copy() to access all of the
892 * headers using the header enums lws_token_indexes from
893 * libwebsockets.h to check for and read the supported header
894 * presence and content before deciding to allow the http
895 * connection to proceed or to kill the connection.
897 * LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION: called when the handshake has
898 * been received and parsed from the client, but the response is
899 * not sent yet. Return non-zero to disallow the connection.
900 * @user is a pointer to the connection user space allocation,
901 * @in is the requested protocol name
902 * In your handler you can use the public APIs
903 * lws_hdr_total_length() / lws_hdr_copy() to access all of the
904 * headers using the header enums lws_token_indexes from
905 * libwebsockets.h to check for and read the supported header
906 * presence and content before deciding to allow the handshake
907 * to proceed or to kill the connection.
909 * LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS: if configured for
910 * including OpenSSL support, this callback allows your user code
911 * to perform extra SSL_CTX_load_verify_locations() or similar
912 * calls to direct OpenSSL where to find certificates the client
913 * can use to confirm the remote server identity. @user is the
916 * LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS: if configured for
917 * including OpenSSL support, this callback allows your user code
918 * to load extra certifcates into the server which allow it to
919 * verify the validity of certificates returned by clients. @user
920 * is the server's OpenSSL SSL_CTX*
922 * LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY: if configured for
923 * including OpenSSL support but no private key file has been
924 * specified (ssl_private_key_filepath is NULL), this is called to
925 * allow the user to set the private key directly via libopenssl
926 * and perform further operations if required; this might be useful
927 * in situations where the private key is not directly accessible
928 * by the OS, for example if it is stored on a smartcard
929 * @user is the server's OpenSSL SSL_CTX*
931 * LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION: if the
932 * libwebsockets context was created with the option
933 * LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT, then this
934 * callback is generated during OpenSSL verification of the cert
935 * sent from the client. It is sent to protocol[0] callback as
936 * no protocol has been negotiated on the connection yet.
937 * Notice that the libwebsockets context and wsi are both NULL
938 * during this callback. See
939 * http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
940 * to understand more detail about the OpenSSL callback that
941 * generates this libwebsockets callback and the meanings of the
942 * arguments passed. In this callback, @user is the x509_ctx,
943 * @in is the ssl pointer and @len is preverify_ok
944 * Notice that this callback maintains libwebsocket return
945 * conventions, return 0 to mean the cert is OK or 1 to fail it.
946 * This also means that if you don't handle this callback then
947 * the default callback action of returning 0 allows the client
950 * LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER: this callback happens
951 * when a client handshake is being compiled. @user is NULL,
952 * @in is a char **, it's pointing to a char * which holds the
953 * next location in the header buffer where you can add
954 * headers, and @len is the remaining space in the header buffer,
955 * which is typically some hundreds of bytes. So, to add a canned
956 * cookie, your handler code might look similar to:
958 * char **p = (char **)in;
963 * *p += sprintf(*p, "Cookie: a=b\x0d\x0a");
967 * Notice if you add anything, you just have to take care about
968 * the CRLF on the line you added. Obviously this callback is
969 * optional, if you don't handle it everything is fine.
971 * Notice the callback is coming to protocols[0] all the time,
972 * because there is no specific protocol handshook yet.
974 * LWS_CALLBACK_CONFIRM_EXTENSION_OKAY: When the server handshake code
975 * sees that it does support a requested extension, before
976 * accepting the extension by additing to the list sent back to
977 * the client it gives this callback just to check that it's okay
978 * to use that extension. It calls back to the requested protocol
979 * and with @in being the extension name, @len is 0 and @user is
980 * valid. Note though at this time the ESTABLISHED callback hasn't
981 * happened yet so if you initialize @user content there, @user
982 * content during this callback might not be useful for anything.
983 * Notice this callback comes to protocols[0].
985 * LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED: When a client
986 * connection is being prepared to start a handshake to a server,
987 * each supported extension is checked with protocols[0] callback
988 * with this reason, giving the user code a chance to suppress the
989 * claim to support that extension by returning non-zero. If
990 * unhandled, by default 0 will be returned and the extension
991 * support included in the header to the server. Notice this
992 * callback comes to protocols[0].
994 * LWS_CALLBACK_PROTOCOL_INIT: One-time call per protocol so it can
995 * do initial setup / allocations etc
997 * LWS_CALLBACK_PROTOCOL_DESTROY: One-time call per protocol indicating
998 * this protocol won't get used at all after this callback, the
999 * context is getting destroyed. Take the opportunity to
1000 * deallocate everything that was allocated by the protocol.
1002 * LWS_CALLBACK_WSI_CREATE: outermost (earliest) wsi create notification
1004 * LWS_CALLBACK_WSI_DESTROY: outermost (latest) wsi destroy notification
1006 * The next five reasons are optional and only need taking care of if you
1007 * will be integrating libwebsockets sockets into an external polling
1010 * For these calls, @in points to a struct lws_pollargs that
1011 * contains @fd, @events and @prev_events members
1013 * LWS_CALLBACK_ADD_POLL_FD: libwebsocket deals with its poll() loop
1014 * internally, but in the case you are integrating with another
1015 * server you will need to have libwebsocket sockets share a
1016 * polling array with the other server. This and the other
1017 * POLL_FD related callbacks let you put your specialized
1018 * poll array interface code in the callback for protocol 0, the
1019 * first protocol you support, usually the HTTP protocol in the
1021 * This callback happens when a socket needs to be
1022 * added to the polling loop: @in points to a struct
1023 * lws_pollargs; the @fd member of the struct is the file
1024 * descriptor, and @events contains the active events.
1026 * If you are using the internal polling loop (the "service"
1027 * callback), you can just ignore these callbacks.
1029 * LWS_CALLBACK_DEL_POLL_FD: This callback happens when a socket descriptor
1030 * needs to be removed from an external polling array. @in is
1031 * again the struct lws_pollargs containing the @fd member
1032 * to be removed. If you are using the internal polling
1033 * loop, you can just ignore it.
1035 * LWS_CALLBACK_CHANGE_MODE_POLL_FD: This callback happens when
1036 * libwebsockets wants to modify the events for a connectiion.
1037 * @in is the struct lws_pollargs with the @fd to change.
1038 * The new event mask is in @events member and the old mask is in
1039 * the @prev_events member.
1040 * If you are using the internal polling loop, you can just ignore
1043 * LWS_CALLBACK_LOCK_POLL:
1044 * LWS_CALLBACK_UNLOCK_POLL: These allow the external poll changes driven
1045 * by libwebsockets to participate in an external thread locking
1046 * scheme around the changes, so the whole thing is threadsafe.
1047 * These are called around three activities in the library,
1048 * - inserting a new wsi in the wsi / fd table (len=1)
1049 * - deleting a wsi from the wsi / fd table (len=1)
1050 * - changing a wsi's POLLIN/OUT state (len=0)
1051 * Locking and unlocking external synchronization objects when
1052 * len == 1 allows external threads to be synchronized against
1053 * wsi lifecycle changes if it acquires the same lock for the
1054 * duration of wsi dereference from the other thread context.
1056 * LWS_CALLBACK_WS_PEER_INITIATED_CLOSE:
1057 * The peer has sent an unsolicited Close WS packet. @in and
1058 * @len are the optional close code (first 2 bytes, network
1059 * order) and the optional additional information which is not
1060 * defined in the standard, and may be a string or non-human-
1062 * If you return 0 lws will echo the close and then close the
1063 * connection. If you return nonzero lws will just close the
1067 lws_callback_function(struct lws *wsi, enum lws_callback_reasons reason,
1068 void *user, void *in, size_t len);
1071 * typedef lws_extension_callback_function() - Hooks to allow extensions to operate
1072 * @context: Websockets context
1073 * @ext: This extension
1074 * @wsi: Opaque websocket instance pointer
1075 * @reason: The reason for the call
1076 * @user: Pointer to ptr to per-session user data allocated by library
1077 * @in: Pointer used for some callback reasons
1078 * @len: Length set for some callback reasons
1080 * Each extension that is active on a particular connection receives
1081 * callbacks during the connection lifetime to allow the extension to
1082 * operate on websocket data and manage itself.
1084 * Libwebsockets takes care of allocating and freeing "user" memory for
1085 * each active extension on each connection. That is what is pointed to
1086 * by the @user parameter.
1088 * LWS_EXT_CB_CONSTRUCT: called when the server has decided to
1089 * select this extension from the list provided by the client,
1090 * just before the server will send back the handshake accepting
1091 * the connection with this extension active. This gives the
1092 * extension a chance to initialize its connection context found
1095 * LWS_EXT_CB_CLIENT_CONSTRUCT: same as LWS_EXT_CB_CONSTRUCT
1096 * but called when client is instantiating this extension. Some
1097 * extensions will work the same on client and server side and then
1098 * you can just merge handlers for both CONSTRUCTS.
1100 * LWS_EXT_CB_DESTROY: called when the connection the extension was
1101 * being used on is about to be closed and deallocated. It's the
1102 * last chance for the extension to deallocate anything it has
1103 * allocated in the user data (pointed to by @user) before the
1104 * user data is deleted. This same callback is used whether you
1105 * are in client or server instantiation context.
1107 * LWS_EXT_CB_PACKET_RX_PREPARSE: when this extension was active on
1108 * a connection, and a packet of data arrived at the connection,
1109 * it is passed to this callback to give the extension a chance to
1110 * change the data, eg, decompress it. @user is pointing to the
1111 * extension's private connection context data, @in is pointing
1112 * to an lws_tokens struct, it consists of a char * pointer called
1113 * token, and an int called token_len. At entry, these are
1114 * set to point to the received buffer and set to the content
1115 * length. If the extension will grow the content, it should use
1116 * a new buffer allocated in its private user context data and
1117 * set the pointed-to lws_tokens members to point to its buffer.
1119 * LWS_EXT_CB_PACKET_TX_PRESEND: this works the same way as
1120 * LWS_EXT_CB_PACKET_RX_PREPARSE above, except it gives the
1121 * extension a chance to change websocket data just before it will
1122 * be sent out. Using the same lws_token pointer scheme in @in,
1123 * the extension can change the buffer and the length to be
1124 * transmitted how it likes. Again if it wants to grow the
1125 * buffer safely, it should copy the data into its own buffer and
1126 * set the lws_tokens token pointer to it.
1128 * LWS_EXT_CB_ARGS_VALIDATE:
1131 lws_extension_callback_function(struct lws_context *context,
1132 const struct lws_extension *ext, struct lws *wsi,
1133 enum lws_extension_callback_reasons reason,
1134 void *user, void *in, size_t len);
1137 * struct lws_protocols - List of protocols and handlers server
1139 * @name: Protocol name that must match the one given in the client
1140 * Javascript new WebSocket(url, 'protocol') name.
1141 * @callback: The service callback used for this protocol. It allows the
1142 * service action for an entire protocol to be encapsulated in
1143 * the protocol-specific callback
1144 * @per_session_data_size: Each new connection using this protocol gets
1145 * this much memory allocated on connection establishment and
1146 * freed on connection takedown. A pointer to this per-connection
1147 * allocation is passed into the callback in the 'user' parameter
1148 * @rx_buffer_size: if you want atomic frames delivered to the callback, you
1149 * should set this to the size of the biggest legal frame that
1150 * you support. If the frame size is exceeded, there is no
1151 * error, but the buffer will spill to the user callback when
1152 * full, which you can detect by using
1153 * lws_remaining_packet_payload(). Notice that you
1154 * just talk about frame size here, the LWS_PRE
1155 * and post-padding are automatically also allocated on top.
1156 * @id: ignored by lws, but useful to contain user information bound
1157 * to the selected protocol. For example if this protocol was
1158 * called "myprotocol-v2", you might set id to 2, and the user
1159 * code that acts differently according to the version can do so by
1160 * switch (wsi->protocol->id), user code might use some bits as
1161 * capability flags based on selected protocol version, etc.
1162 * @user: User provided context data at the protocol level.
1163 * Accessible via lws_get_protocol(wsi)->user
1164 * This should not be confused with wsi->user, it is not the same.
1165 * The library completely ignores any value in here.
1167 * This structure represents one protocol supported by the server. An
1168 * array of these structures is passed to lws_create_server()
1169 * allows as many protocols as you like to be handled by one server.
1171 * The first protocol given has its callback used for user callbacks when
1172 * there is no agreed protocol name, that's true during HTTP part of the
1173 * connection and true if the client did not send a Protocol: header.
1176 struct lws_protocols {
1178 lws_callback_function *callback;
1179 size_t per_session_data_size;
1180 size_t rx_buffer_size;
1184 /* Add new things just above here ---^
1185 * This is part of the ABI, don't needlessly break compatibilty */
1188 enum lws_ext_options_types {
1193 /* Add new things just above here ---^
1194 * This is part of the ABI, don't needlessly break compatibilty */
1198 * struct lws_ext_options - Option arguments to the extension. These are
1199 * used in the negotiation at ws upgrade time.
1200 * The helper function lws_ext_parse_options()
1201 * uses these to generate callbacks
1203 * @name: Option name, eg, "server_no_context_takeover"
1204 * @type: What kind of args the option can take
1206 struct lws_ext_options {
1208 enum lws_ext_options_types type;
1210 /* Add new things just above here ---^
1211 * This is part of the ABI, don't needlessly break compatibilty */
1214 struct lws_ext_option_arg {
1221 * struct lws_extension - An extension we know how to cope with
1223 * @name: Formal extension name, eg, "permessage-deflate"
1224 * @callback: Service callback
1225 * @client_offer: String containing exts and options client offers
1228 struct lws_extension {
1230 lws_extension_callback_function *callback;
1231 const char *client_offer;
1233 /* Add new things just above here ---^
1234 * This is part of the ABI, don't needlessly break compatibilty */
1238 * The internal exts are part of the public abi
1239 * If we add more extensions, publish the callback here
1242 extern int lws_extension_callback_pm_deflate(
1243 struct lws_context *context, const struct lws_extension *ext,
1244 struct lws *wsi, enum lws_extension_callback_reasons reason,
1245 void *user, void *in, size_t len);
1249 * struct lws_context_creation_info - parameters to create context with
1251 * @port: Port to listen on... you can use CONTEXT_PORT_NO_LISTEN to
1252 * suppress listening on any port, that's what you want if you are
1253 * not running a websocket server at all but just using it as a
1255 * @iface: NULL to bind the listen socket to all interfaces, or the
1256 * interface name, eg, "eth2"
1257 * @protocols: Array of structures listing supported protocols and a protocol-
1258 * specific callback for each one. The list is ended with an
1259 * entry that has a NULL callback pointer.
1260 * It's not const because we write the owning_server member
1261 * @extensions: NULL or array of lws_extension structs listing the
1262 * extensions this context supports. If you configured with
1263 * --without-extensions, you should give NULL here.
1264 * @token_limits: NULL or struct lws_token_limits pointer which is initialized
1265 * with a token length limit for each possible WSI_TOKEN_***
1266 * @ssl_cert_filepath: If libwebsockets was compiled to use ssl, and you want
1267 * to listen using SSL, set to the filepath to fetch the
1268 * server cert from, otherwise NULL for unencrypted
1269 * @ssl_private_key_filepath: filepath to private key if wanting SSL mode;
1270 * if this is set to NULL but sll_cert_filepath is set, the
1271 * OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY callback is called
1272 * to allow setting of the private key directly via openSSL
1274 * @ssl_ca_filepath: CA certificate filepath or NULL
1275 * @ssl_cipher_list: List of valid ciphers to use (eg,
1276 * "RC4-MD5:RC4-SHA:AES128-SHA:AES256-SHA:HIGH:!DSS:!aNULL"
1277 * or you can leave it as NULL to get "DEFAULT"
1278 * @http_proxy_address: If non-NULL, attempts to proxy via the given address.
1279 * If proxy auth is required, use format
1280 * "username:password@server:port"
1281 * @http_proxy_port: If http_proxy_address was non-NULL, uses this port at
1283 * @gid: group id to change to after setting listen socket, or -1.
1284 * @uid: user id to change to after setting listen socket, or -1.
1285 * @options: 0, or LWS_SERVER_OPTION_... bitfields
1286 * @user: optional user pointer that can be recovered via the context
1287 * pointer using lws_context_user
1288 * @ka_time: 0 for no keepalive, otherwise apply this keepalive timeout to
1289 * all libwebsocket sockets, client or server
1290 * @ka_probes: if ka_time was nonzero, after the timeout expires how many
1291 * times to try to get a response from the peer before giving up
1292 * and killing the connection
1293 * @ka_interval: if ka_time was nonzero, how long to wait before each ka_probes
1295 * @provided_client_ssl_ctx: If non-null, swap out libwebsockets ssl
1296 * implementation for the one provided by provided_ssl_ctx.
1297 * Libwebsockets no longer is responsible for freeing the context
1298 * if this option is selected.
1299 * @max_http_header_data: The max amount of header payload that can be handled
1300 * in an http request (unrecognized header payload is dropped)
1301 * @max_http_header_pool: The max number of connections with http headers that
1302 * can be processed simultaneously (the corresponding memory is
1303 * allocated for the lifetime of the context). If the pool is
1304 * busy new incoming connections must wait for accept until one
1306 * @count_threads: how many contexts to create in an array, 0 = 1
1307 * @fd_limit_per_thread: nonzero means restrict each service thread to this
1308 * many fds, 0 means the default which is divide the process fd
1309 * limit by the number of threads.
1313 struct lws_context_creation_info {
1316 const struct lws_protocols *protocols;
1317 const struct lws_extension *extensions;
1318 const struct lws_token_limits *token_limits;
1319 const char *ssl_private_key_password;
1320 const char *ssl_cert_filepath;
1321 const char *ssl_private_key_filepath;
1322 const char *ssl_ca_filepath;
1323 const char *ssl_cipher_list;
1324 const char *http_proxy_address;
1325 unsigned int http_proxy_port;
1328 unsigned int options;
1333 #ifdef LWS_OPENSSL_SUPPORT
1334 SSL_CTX *provided_client_ssl_ctx;
1335 #else /* maintain structure layout either way */
1336 void *provided_client_ssl_ctx;
1339 short max_http_header_data;
1340 short max_http_header_pool;
1342 unsigned int count_threads;
1343 unsigned int fd_limit_per_thread;
1345 /* Add new things just above here ---^
1346 * This is part of the ABI, don't needlessly break compatibility
1348 * The below is to ensure later library versions with new
1349 * members added above will see 0 (default) even if the app
1350 * was not built against the newer headers.
1357 * struct lws_client_connect_info - parameters to connect with when using
1358 * lws_client_connect_via_info()
1360 * @context: lws context to create connection in
1361 * @address: remote address to connect to
1362 * @port: remote port to connect to
1363 * @ssl_connection: nonzero for ssl
1365 * @host: content of host header
1366 * @origin: content of origin header
1367 * @protocol: list of ws protocols
1368 * @ietf_version_or_minus_one: currently leave at 0 or -1
1369 * @userdata: if non-NULL, use this as wsi user_data instead of malloc it
1370 * @client_exts: array of extensions that may be used on connection
1373 struct lws_client_connect_info {
1374 struct lws_context *context;
1375 const char *address;
1381 const char *protocol;
1382 int ietf_version_or_minus_one;
1384 const struct lws_extension *client_exts;
1386 /* Add new things just above here ---^
1387 * This is part of the ABI, don't needlessly break compatibility
1389 * The below is to ensure later library versions with new
1390 * members added above will see 0 (default) even if the app
1391 * was not built against the newer headers.
1397 LWS_VISIBLE LWS_EXTERN void
1398 lws_set_log_level(int level,
1399 void (*log_emit_function)(int level, const char *line));
1401 LWS_VISIBLE LWS_EXTERN void
1402 lwsl_emit_syslog(int level, const char *line);
1404 LWS_VISIBLE LWS_EXTERN struct lws_context *
1405 lws_create_context(struct lws_context_creation_info *info);
1407 LWS_VISIBLE LWS_EXTERN int
1408 lws_set_proxy(struct lws_context *context, const char *proxy);
1410 LWS_VISIBLE LWS_EXTERN void
1411 lws_context_destroy(struct lws_context *context);
1413 LWS_VISIBLE LWS_EXTERN int
1414 lws_service(struct lws_context *context, int timeout_ms);
1416 LWS_VISIBLE LWS_EXTERN int
1417 lws_service_tsi(struct lws_context *context, int timeout_ms, int tsi);
1419 LWS_VISIBLE LWS_EXTERN void
1420 lws_cancel_service_pt(struct lws *wsi);
1422 LWS_VISIBLE LWS_EXTERN void
1423 lws_cancel_service(struct lws_context *context);
1425 LWS_VISIBLE LWS_EXTERN int
1426 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
1429 LWS_VISIBLE LWS_EXTERN const unsigned char *
1430 lws_token_to_string(enum lws_token_indexes token);
1432 LWS_VISIBLE LWS_EXTERN int
1433 lws_add_http_header_by_name(struct lws *wsi, const unsigned char *name,
1434 const unsigned char *value, int length,
1435 unsigned char **p, unsigned char *end);
1436 LWS_VISIBLE LWS_EXTERN int
1437 lws_finalize_http_header(struct lws *wsi, unsigned char **p,
1438 unsigned char *end);
1439 LWS_VISIBLE LWS_EXTERN int
1440 lws_add_http_header_by_token(struct lws *wsi, enum lws_token_indexes token,
1441 const unsigned char *value, int length,
1442 unsigned char **p, unsigned char *end);
1443 LWS_VISIBLE LWS_EXTERN int
1444 lws_add_http_header_content_length(struct lws *wsi,
1445 unsigned long content_length,
1446 unsigned char **p, unsigned char *end);
1447 LWS_VISIBLE LWS_EXTERN int
1448 lws_add_http_header_status(struct lws *wsi,
1449 unsigned int code, unsigned char **p,
1450 unsigned char *end);
1452 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1453 lws_http_transaction_completed(struct lws *wsi);
1455 #ifdef LWS_USE_LIBEV
1456 typedef void (lws_ev_signal_cb)(EV_P_ struct ev_signal *w, int revents);
1458 LWS_VISIBLE LWS_EXTERN int
1459 lws_sigint_cfg(struct lws_context *context, int use_ev_sigint,
1460 lws_ev_signal_cb *cb);
1462 LWS_VISIBLE LWS_EXTERN int
1463 lws_initloop(struct lws_context *context, struct ev_loop *loop);
1466 lws_sigint_cb(struct ev_loop *loop, struct ev_signal *watcher, int revents);
1467 #endif /* LWS_USE_LIBEV */
1469 LWS_VISIBLE LWS_EXTERN int
1470 lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd);
1472 LWS_VISIBLE LWS_EXTERN int
1473 lws_service_fd_tsi(struct lws_context *context, struct lws_pollfd *pollfd,
1476 LWS_VISIBLE LWS_EXTERN void *
1477 lws_context_user(struct lws_context *context);
1479 LWS_VISIBLE LWS_EXTERN void *
1480 lws_wsi_user(struct lws *wsi);
1483 * NOTE: These public enums are part of the abi. If you want to add one,
1484 * add it at where specified so existing users are unaffected.
1486 enum pending_timeout {
1487 NO_PENDING_TIMEOUT = 0,
1488 PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE = 1,
1489 PENDING_TIMEOUT_AWAITING_CONNECT_RESPONSE = 2,
1490 PENDING_TIMEOUT_ESTABLISH_WITH_SERVER = 3,
1491 PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE = 4,
1492 PENDING_TIMEOUT_AWAITING_PING = 5,
1493 PENDING_TIMEOUT_CLOSE_ACK = 6,
1494 PENDING_TIMEOUT_AWAITING_EXTENSION_CONNECT_RESPONSE = 7,
1495 PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE = 8,
1496 PENDING_TIMEOUT_SSL_ACCEPT = 9,
1497 PENDING_TIMEOUT_HTTP_CONTENT = 10,
1498 PENDING_TIMEOUT_AWAITING_CLIENT_HS_SEND = 11,
1499 PENDING_FLUSH_STORED_SEND_BEFORE_CLOSE = 12,
1500 PENDING_TIMEOUT_SHUTDOWN_FLUSH = 13,
1502 /****** add new things just above ---^ ******/
1505 LWS_VISIBLE LWS_EXTERN void
1506 lws_set_timeout(struct lws *wsi, enum pending_timeout reason, int secs);
1511 * When sending with websocket protocol
1515 * LWS_WRITE_CONTINUATION,
1519 * the send buffer has to have LWS_PRE bytes valid BEFORE
1520 * the buffer pointer you pass to lws_write().
1522 * This allows us to add protocol info before and after the data, and send as
1523 * one packet on the network without payload copying, for maximum efficiency.
1525 * So for example you need this kind of code to use lws_write with a
1528 * char buf[LWS_PRE + 128];
1530 * // fill your part of the buffer... for example here it's all zeros
1531 * memset(&buf[LWS_PRE], 0, 128);
1533 * lws_write(wsi, &buf[LWS_PRE], 128, LWS_WRITE_TEXT);
1535 * When sending HTTP, with
1538 * LWS_WRITE_HTTP_HEADERS
1539 * LWS_WRITE_HTTP_FINAL
1541 * there is no protocol data prepended, and don't need to take care about the
1542 * LWS_PRE bytes valid before the buffer pointer.
1544 * LWS_PRE is at least the frame nonce + 2 header + 8 length
1545 * LWS_SEND_BUFFER_POST_PADDING is deprecated, it's now 0 and can be left off.
1546 * The example apps no longer use it.
1548 * Pad LWS_PRE to the CPU word size, so that word references
1549 * to the address immediately after the padding won't cause an unaligned access
1550 * error. Sometimes for performance reasons the recommended padding is even
1551 * larger than sizeof(void *).
1554 #if !defined(LWS_SIZEOFPTR)
1555 #define LWS_SIZEOFPTR (sizeof (void *))
1557 #if !defined(u_int64_t)
1558 #define u_int64_t unsigned long long
1562 #define _LWS_PAD_SIZE 16 /* Intel recommended for best performance */
1564 #define _LWS_PAD_SIZE LWS_SIZEOFPTR /* Size of a pointer on the target arch */
1566 #define _LWS_PAD(n) (((n) % _LWS_PAD_SIZE) ? \
1567 ((n) + (_LWS_PAD_SIZE - ((n) % _LWS_PAD_SIZE))) : (n))
1568 #define LWS_PRE _LWS_PAD(4 + 10)
1569 /* used prior to 1.7 and retained for backward compatibility */
1570 #define LWS_SEND_BUFFER_PRE_PADDING LWS_PRE
1571 #define LWS_SEND_BUFFER_POST_PADDING 0
1573 LWS_VISIBLE LWS_EXTERN int
1574 lws_write(struct lws *wsi, unsigned char *buf, size_t len,
1575 enum lws_write_protocol protocol);
1578 * lws_close_reason - Set reason and aux data to send with Close packet
1579 * If you are going to return nonzero from the callback
1580 * requesting the connection to close, you can optionally
1581 * call this to set the reason the peer will be told if
1584 * @wsi: The websocket connection to set the close reason on
1585 * @status: A valid close status from websocket standard
1586 * @buf: NULL or buffer containing up to 124 bytes of auxiliary data
1587 * @len: Length of data in @buf to send
1589 LWS_VISIBLE LWS_EXTERN void
1590 lws_close_reason(struct lws *wsi, enum lws_close_status status,
1591 unsigned char *buf, size_t len);
1593 /* helper for case where buffer may be const */
1594 #define lws_write_http(wsi, buf, len) \
1595 lws_write(wsi, (unsigned char *)(buf), len, LWS_WRITE_HTTP)
1597 LWS_VISIBLE LWS_EXTERN int
1598 lws_serve_http_file(struct lws *wsi, const char *file, const char *content_type,
1599 const char *other_headers, int other_headers_len);
1600 LWS_VISIBLE LWS_EXTERN int
1601 lws_serve_http_file_fragment(struct lws *wsi);
1603 LWS_VISIBLE LWS_EXTERN int
1604 lws_return_http_status(struct lws *wsi, unsigned int code,
1605 const char *html_body);
1607 LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
1608 lws_get_protocol(struct lws *wsi);
1610 LWS_VISIBLE LWS_EXTERN int
1611 lws_callback_on_writable(struct lws *wsi);
1613 LWS_VISIBLE LWS_EXTERN int
1614 lws_callback_on_writable_all_protocol(const struct lws_context *context,
1615 const struct lws_protocols *protocol);
1617 LWS_VISIBLE LWS_EXTERN int
1618 lws_callback_all_protocol(struct lws_context *context,
1619 const struct lws_protocols *protocol, int reason);
1621 LWS_VISIBLE LWS_EXTERN int
1622 lws_get_socket_fd(struct lws *wsi);
1624 LWS_VISIBLE LWS_EXTERN int
1625 lws_is_final_fragment(struct lws *wsi);
1627 LWS_VISIBLE LWS_EXTERN unsigned char
1628 lws_get_reserved_bits(struct lws *wsi);
1630 LWS_VISIBLE LWS_EXTERN int
1631 lws_rx_flow_control(struct lws *wsi, int enable);
1633 LWS_VISIBLE LWS_EXTERN void
1634 lws_rx_flow_allow_all_protocol(const struct lws_context *context,
1635 const struct lws_protocols *protocol);
1637 LWS_VISIBLE LWS_EXTERN size_t
1638 lws_remaining_packet_payload(struct lws *wsi);
1641 * if the protocol does not have any guidance, returns -1. Currently only
1642 * http2 connections get send window information from this API. But your code
1643 * should use it so it can work properly with any protocol.
1645 * If nonzero return is the amount of payload data the peer or intermediary has
1646 * reported it has buffer space for. That has NO relationship with the amount
1647 * of buffer space your OS can accept on this connection for a write action.
1649 * This number represents the maximum you could send to the peer or intermediary
1650 * on this connection right now without it complaining.
1652 * lws manages accounting for send window updates and payload writes
1653 * automatically, so this number reflects the situation at the peer or
1654 * intermediary dynamically.
1656 LWS_VISIBLE LWS_EXTERN size_t
1657 lws_get_peer_write_allowance(struct lws *wsi);
1659 /* deprecated, use lws_client_connect_via_info() */
1660 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1661 lws_client_connect(struct lws_context *clients, const char *address,
1662 int port, int ssl_connection, const char *path,
1663 const char *host, const char *origin, const char *protocol,
1664 int ietf_version_or_minus_one);
1665 /* deprecated, use lws_client_connect_via_info() */
1666 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1667 lws_client_connect_extended(struct lws_context *clients, const char *address,
1668 int port, int ssl_connection, const char *path,
1669 const char *host, const char *origin,
1670 const char *protocol, int ietf_version_or_minus_one,
1673 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1674 lws_client_connect_via_info(struct lws_client_connect_info * ccinfo);
1676 LWS_VISIBLE LWS_EXTERN struct lws *
1677 lws_adopt_socket(struct lws_context *context, lws_sockfd_type accept_fd);
1679 LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
1680 lws_canonical_hostname(struct lws_context *context);
1683 LWS_VISIBLE LWS_EXTERN void
1684 lws_get_peer_addresses(struct lws *wsi, lws_sockfd_type fd, char *name,
1685 int name_len, char *rip, int rip_len);
1687 LWS_VISIBLE LWS_EXTERN int
1688 lws_get_random(struct lws_context *context, void *buf, int len);
1690 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1691 lws_daemonize(const char *_lock_path);
1693 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1694 lws_send_pipe_choked(struct lws *wsi);
1696 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1697 lws_partial_buffered(struct lws *wsi);
1699 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1700 lws_frame_is_binary(struct lws *wsi);
1702 LWS_VISIBLE LWS_EXTERN int
1703 lws_is_ssl(struct lws *wsi);
1704 #ifdef LWS_SHA1_USE_OPENSSL_NAME
1705 #define lws_SHA1 SHA1
1707 LWS_VISIBLE LWS_EXTERN unsigned char *
1708 lws_SHA1(const unsigned char *d, size_t n, unsigned char *md);
1711 LWS_VISIBLE LWS_EXTERN int
1712 lws_b64_encode_string(const char *in, int in_len, char *out, int out_size);
1714 LWS_VISIBLE LWS_EXTERN int
1715 lws_b64_decode_string(const char *in, char *out, int out_size);
1717 LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
1718 lws_get_library_version(void);
1720 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1721 lws_parse_uri(char *p, const char **prot, const char **ads, int *port,
1725 * Access to http headers
1727 * In lws the client http headers are temporarily malloc'd only for the
1728 * duration of the http part of the handshake. It's because in most cases,
1729 * the header content is ignored for the whole rest of the connection lifetime
1730 * and would then just be taking up space needlessly.
1732 * During LWS_CALLBACK_HTTP when the URI path is delivered is the last time
1733 * the http headers are still allocated, you can use these apis then to
1734 * look at and copy out interesting header content (cookies, etc)
1736 * Notice that the header total length reported does not include a terminating
1737 * '\0', however you must allocate for it when using the _copy apis. So the
1738 * length reported for a header containing "123" is 3, but you must provide
1739 * a buffer of length 4 so that "123\0" may be copied into it, or the copy
1740 * will fail with a nonzero return code.
1743 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1744 lws_hdr_total_length(struct lws *wsi, enum lws_token_indexes h);
1746 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1747 lws_hdr_fragment_length(struct lws *wsi, enum lws_token_indexes h, int frag_idx);
1750 * copies the whole, aggregated header, even if it was delivered in
1751 * several actual headers piece by piece
1753 LWS_VISIBLE LWS_EXTERN int
1754 lws_hdr_copy(struct lws *wsi, char *dest, int len, enum lws_token_indexes h);
1757 * copies only fragment frag_idx of a header. Normally this is only useful
1758 * to parse URI arguments like ?x=1&y=2, token index WSI_TOKEN_HTTP_URI_ARGS
1759 * fragment 0 will contain "x=1" and fragment 1 "y=2"
1761 LWS_VISIBLE LWS_EXTERN int
1762 lws_hdr_copy_fragment(struct lws *wsi, char *dest, int len,
1763 enum lws_token_indexes h, int frag_idx);
1766 /* get the active file operations struct */
1767 LWS_VISIBLE LWS_EXTERN struct lws_plat_file_ops * LWS_WARN_UNUSED_RESULT
1768 lws_get_fops(struct lws_context *context);
1770 LWS_VISIBLE LWS_EXTERN struct lws_context * LWS_WARN_UNUSED_RESULT
1771 lws_get_context(const struct lws *wsi);
1773 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1774 lws_get_count_threads(struct lws_context *context);
1777 * Wsi-associated File Operations access helpers
1779 * Use these helper functions if you want to access a file from the perspective
1780 * of a specific wsi, which is usually the case. If you just want contextless
1781 * file access, use the fops callbacks directly with NULL wsi instead of these
1784 * If so, then it calls the platform handler or user overrides where present
1785 * (as defined in info->fops)
1787 * The advantage from all this is user code can be portable for file operations
1788 * without having to deal with differences between platforms.
1791 static LWS_INLINE lws_filefd_type LWS_WARN_UNUSED_RESULT
1792 lws_plat_file_open(struct lws *wsi, const char *filename,
1793 unsigned long *filelen, int flags)
1795 return lws_get_fops(lws_get_context(wsi))->open(wsi, filename,
1799 static LWS_INLINE int
1800 lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
1802 return lws_get_fops(lws_get_context(wsi))->close(wsi, fd);
1805 static LWS_INLINE unsigned long
1806 lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
1808 return lws_get_fops(lws_get_context(wsi))->seek_cur(wsi, fd, offset);
1811 static LWS_INLINE int LWS_WARN_UNUSED_RESULT
1812 lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
1813 unsigned char *buf, unsigned long len)
1815 return lws_get_fops(lws_get_context(wsi))->read(wsi, fd, amount, buf,
1819 static LWS_INLINE int LWS_WARN_UNUSED_RESULT
1820 lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
1821 unsigned char *buf, unsigned long len)
1823 return lws_get_fops(lws_get_context(wsi))->write(wsi, fd, amount, buf,
1828 * Note: this is not normally needed as a user api. It's provided in case it is
1829 * useful when integrating with other app poll loop service code.
1831 LWS_VISIBLE LWS_EXTERN int
1832 lws_read(struct lws *wsi, unsigned char *buf, size_t len);
1834 #ifndef LWS_NO_EXTENSIONS
1836 #define lws_get_internal_extensions() NULL
1837 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1838 lws_ext_parse_options(const struct lws_extension *ext, struct lws *wsi,
1839 void *ext_user, const struct lws_ext_options *opts, const char *o, int len);
1843 * custom allocator support
1845 LWS_VISIBLE LWS_EXTERN void
1846 lws_set_allocator(void *(*realloc)(void *ptr, size_t size));