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>
120 #define _O_RDONLY 0x0000
121 #define O_RDONLY _O_RDONLY
124 // Visual studio older than 2015 and WIN_CE has only _stricmp
125 #if (defined(_MSC_VER) && _MSC_VER < 1900) || defined(_WIN32_WCE)
126 #define strcasecmp _stricmp
128 #define strcasecmp stricmp
130 #define getdtablesize() 30000
132 #define LWS_INLINE __inline
134 #define LWS_WARN_UNUSED_RESULT
135 #define LWS_WARN_DEPRECATED
139 #define LWS_EXTERN extern __declspec(dllexport)
141 #define LWS_EXTERN extern __declspec(dllimport)
147 #define LWS_INVALID_FILE INVALID_HANDLE_VALUE
148 #define LWS_O_RDONLY _O_RDONLY
150 #if !defined(_MSC_VER) || _MSC_VER < 1900 /* Visual Studio 2015 already defines this in <stdio.h> */
151 #define snprintf _snprintf
155 #define __func__ __FUNCTION__
158 #else /* NOT WIN32 */
161 #if defined(__NetBSD__) || defined(__FreeBSD__)
162 #include <netinet/in.h>
165 #define LWS_INLINE inline
166 #define LWS_O_RDONLY O_RDONLY
168 #ifndef MBED_OPERATORS
171 #define LWS_INVALID_FILE -1
173 #define getdtablesize() (20)
174 #define LWS_INVALID_FILE NULL
177 #if defined(__GNUC__)
179 /* warn_unused_result attribute only supported by GCC 3.4 or later */
180 #if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
181 #define LWS_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
183 #define LWS_WARN_UNUSED_RESULT
186 #define LWS_VISIBLE __attribute__((visibility("default")))
187 #define LWS_WARN_DEPRECATED __attribute__ ((deprecated))
190 #define LWS_WARN_UNUSED_RESULT
191 #define LWS_WARN_DEPRECATED
194 #if defined(__ANDROID__)
196 #define getdtablesize() sysconf(_SC_OPEN_MAX)
203 #endif /* LWS_USE_LIBEV */
206 #endif /* LWS_USE_LIBUV */
209 #define LWS_EXTERN extern
215 #include <sys/time.h>
219 #ifdef LWS_OPENSSL_SUPPORT
222 #ifdef USE_OLD_CYASSL
223 #include <cyassl/openssl/ssl.h>
224 #include <cyassl/error-ssl.h>
226 #include <wolfssl/openssl/ssl.h>
227 #include <wolfssl/error-ssl.h>
228 #endif /* not USE_OLD_CYASSL */
230 #if defined(LWS_USE_POLARSSL)
231 #include <polarssl/ssl.h>
232 struct lws_polarssl_context {
234 x509_crt certificate;
237 typedef struct lws_polarssl_context SSL_CTX;
238 typedef ssl_context SSL;
240 #if defined(LWS_USE_MBEDTLS)
241 #include <mbedtls/ssl.h>
243 #include <openssl/ssl.h>
244 #include <openssl/err.h>
245 #endif /* not USE_MBEDTLS */
246 #endif /* not USE_POLARSSL */
247 #endif /* not USE_WOLFSSL */
251 #define CONTEXT_PORT_NO_LISTEN -1
253 enum lws_log_levels {
263 LLL_LATENCY = 1 << 9,
265 LLL_COUNT = 10 /* set to count of valid flags */
268 LWS_VISIBLE LWS_EXTERN void _lws_log(int filter, const char *format, ...);
269 LWS_VISIBLE LWS_EXTERN void _lws_logv(int filter, const char *format, va_list vl);
270 LWS_VISIBLE LWS_EXTERN int
271 lwsl_timestamp(int level, char *p, int len);
273 /* notice, warn and log are always compiled in */
274 #define lwsl_notice(...) _lws_log(LLL_NOTICE, __VA_ARGS__)
275 #define lwsl_warn(...) _lws_log(LLL_WARN, __VA_ARGS__)
276 #define lwsl_err(...) _lws_log(LLL_ERR, __VA_ARGS__)
278 * weaker logging can be deselected at configure time using --disable-debug
279 * that gets rid of the overhead of checking while keeping _warn and _err
284 #define lwsl_info(...) _lws_log(LLL_INFO, __VA_ARGS__)
285 #define lwsl_debug(...) _lws_log(LLL_DEBUG, __VA_ARGS__)
286 #define lwsl_parser(...) _lws_log(LLL_PARSER, __VA_ARGS__)
287 #define lwsl_header(...) _lws_log(LLL_HEADER, __VA_ARGS__)
288 #define lwsl_ext(...) _lws_log(LLL_EXT, __VA_ARGS__)
289 #define lwsl_client(...) _lws_log(LLL_CLIENT, __VA_ARGS__)
290 #define lwsl_latency(...) _lws_log(LLL_LATENCY, __VA_ARGS__)
291 LWS_VISIBLE LWS_EXTERN void lwsl_hexdump(void *buf, size_t len);
295 #define lwsl_info(...) {}
296 #define lwsl_debug(...) {}
297 #define lwsl_parser(...) {}
298 #define lwsl_header(...) {}
299 #define lwsl_ext(...) {}
300 #define lwsl_client(...) {}
301 #define lwsl_latency(...) {}
302 #define lwsl_hexdump(a, b)
308 #ifndef lws_container_of
309 #define lws_container_of(P,T,M) ((T *)((char *)(P) - offsetof(T, M)))
314 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
316 /* api change list for user code to test against */
318 #define LWS_FEATURE_SERVE_HTTP_FILE_HAS_OTHER_HEADERS_ARG
320 /* the struct lws_protocols has the id field present */
321 #define LWS_FEATURE_PROTOCOLS_HAS_ID_FIELD
323 /* you can call lws_get_peer_write_allowance */
324 #define LWS_FEATURE_PROTOCOLS_HAS_PEER_WRITE_ALLOWANCE
326 /* extra parameter introduced in 917f43ab821 */
327 #define LWS_FEATURE_SERVE_HTTP_FILE_HAS_OTHER_HEADERS_LEN
329 /* File operations stuff exists */
330 #define LWS_FEATURE_FOPS
333 * NOTE: These public enums are part of the abi. If you want to add one,
334 * add it at where specified so existing users are unaffected.
336 enum lws_context_options {
337 LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT = (1 << 1) |
339 LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME = (1 << 2),
340 LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT = (1 << 3) |
342 LWS_SERVER_OPTION_LIBEV = (1 << 4),
343 LWS_SERVER_OPTION_DISABLE_IPV6 = (1 << 5),
344 LWS_SERVER_OPTION_DISABLE_OS_CA_CERTS = (1 << 6),
345 LWS_SERVER_OPTION_PEER_CERT_NOT_REQUIRED = (1 << 7),
346 LWS_SERVER_OPTION_VALIDATE_UTF8 = (1 << 8),
347 LWS_SERVER_OPTION_SSL_ECDH = (1 << 9) |
349 LWS_SERVER_OPTION_LIBUV = (1 << 10),
350 LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS = (1 << 11) |
353 LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT = (1 << 12),
354 LWS_SERVER_OPTION_EXPLICIT_VHOSTS = (1 << 13),
355 LWS_SERVER_OPTION_UNIX_SOCK = (1 << 14),
356 LWS_SERVER_OPTION_STS = (1 << 15),
358 /****** add new things just above ---^ ******/
361 #define lws_check_opt(c, f) (((c) & (f)) == (f))
364 * NOTE: These public enums are part of the abi. If you want to add one,
365 * add it at where specified so existing users are unaffected.
367 enum lws_callback_reasons {
368 LWS_CALLBACK_ESTABLISHED = 0,
369 LWS_CALLBACK_CLIENT_CONNECTION_ERROR = 1,
370 LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH = 2,
371 LWS_CALLBACK_CLIENT_ESTABLISHED = 3,
372 LWS_CALLBACK_CLOSED = 4,
373 LWS_CALLBACK_CLOSED_HTTP = 5,
374 LWS_CALLBACK_RECEIVE = 6,
375 LWS_CALLBACK_RECEIVE_PONG = 7,
376 LWS_CALLBACK_CLIENT_RECEIVE = 8,
377 LWS_CALLBACK_CLIENT_RECEIVE_PONG = 9,
378 LWS_CALLBACK_CLIENT_WRITEABLE = 10,
379 LWS_CALLBACK_SERVER_WRITEABLE = 11,
380 LWS_CALLBACK_HTTP = 12,
381 LWS_CALLBACK_HTTP_BODY = 13,
382 LWS_CALLBACK_HTTP_BODY_COMPLETION = 14,
383 LWS_CALLBACK_HTTP_FILE_COMPLETION = 15,
384 LWS_CALLBACK_HTTP_WRITEABLE = 16,
385 LWS_CALLBACK_FILTER_NETWORK_CONNECTION = 17,
386 LWS_CALLBACK_FILTER_HTTP_CONNECTION = 18,
387 LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED = 19,
388 LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION = 20,
389 LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS = 21,
390 LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS = 22,
391 LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION = 23,
392 LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER = 24,
393 LWS_CALLBACK_CONFIRM_EXTENSION_OKAY = 25,
394 LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED = 26,
395 LWS_CALLBACK_PROTOCOL_INIT = 27,
396 LWS_CALLBACK_PROTOCOL_DESTROY = 28,
397 LWS_CALLBACK_WSI_CREATE /* always protocol[0] */ = 29,
398 LWS_CALLBACK_WSI_DESTROY /* always protocol[0] */ = 30,
399 LWS_CALLBACK_GET_THREAD_ID = 31,
401 /* external poll() management support */
402 LWS_CALLBACK_ADD_POLL_FD = 32,
403 LWS_CALLBACK_DEL_POLL_FD = 33,
404 LWS_CALLBACK_CHANGE_MODE_POLL_FD = 34,
405 LWS_CALLBACK_LOCK_POLL = 35,
406 LWS_CALLBACK_UNLOCK_POLL = 36,
408 LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY = 37,
409 LWS_CALLBACK_WS_PEER_INITIATED_CLOSE = 38,
411 LWS_CALLBACK_WS_EXT_DEFAULTS = 39,
413 LWS_CALLBACK_CGI = 40,
414 LWS_CALLBACK_CGI_TERMINATED = 41,
415 LWS_CALLBACK_CGI_STDIN_DATA = 42,
416 LWS_CALLBACK_CGI_STDIN_COMPLETED = 43,
417 LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP = 44,
418 LWS_CALLBACK_CLOSED_CLIENT_HTTP = 45,
419 LWS_CALLBACK_RECEIVE_CLIENT_HTTP = 46,
420 LWS_CALLBACK_COMPLETED_CLIENT_HTTP = 47,
421 LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ = 48,
423 /****** add new things just above ---^ ******/
425 LWS_CALLBACK_USER = 1000, /* user code can use any including / above */
430 typedef SOCKET lws_sockfd_type;
431 typedef HANDLE lws_filefd_type;
432 #define lws_sockfd_valid(sfd) (!!sfd)
440 #if defined(MBED_OPERATORS)
441 /* it's a class lws_conn * */
442 typedef void * lws_sockfd_type;
443 typedef void * lws_filefd_type;
444 #define lws_sockfd_valid(sfd) (!!sfd)
450 #define POLLIN 0x0001
451 #define POLLPRI 0x0002
452 #define POLLOUT 0x0004
453 #define POLLERR 0x0008
454 #define POLLHUP 0x0010
455 #define POLLNVAL 0x0020
459 void * mbed3_create_tcp_stream_socket(void);
460 void mbed3_delete_tcp_stream_socket(void *sockfd);
461 void mbed3_tcp_stream_bind(void *sock, int port, struct lws *);
462 void mbed3_tcp_stream_accept(void *sock, struct lws *);
464 typedef int lws_sockfd_type;
465 typedef int lws_filefd_type;
466 #define lws_sockfd_valid(sfd) (sfd >= 0)
469 #define lws_pollfd pollfd
472 /* argument structure for all external poll related calls
475 struct lws_pollargs {
476 lws_sockfd_type fd; /* applicable socket descriptor */
477 int events; /* the new event mask */
478 int prev_events; /* the previous event mask */
482 * struct lws_plat_file_ops - Platform-specific file operations
484 * These provide platform-agnostic ways to deal with filesystem access in the
485 * library and in the user code.
487 * @open: Open file (always binary access if plat supports it)
488 * filelen is filled on exit to be the length of the file
489 * flags should be set to O_RDONLY or O_RDWR
491 * @seek_cur: Seek from current position
492 * @read: Read fron file *amount is set on exit to amount read
493 * @write: Write to file *amount is set on exit as amount written
495 struct lws_plat_file_ops {
496 lws_filefd_type (*open)(struct lws *wsi, const char *filename,
497 unsigned long *filelen, int flags);
498 int (*close)(struct lws *wsi, lws_filefd_type fd);
499 unsigned long (*seek_cur)(struct lws *wsi, lws_filefd_type fd,
500 long offset_from_cur_pos);
501 int (*read)(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
502 unsigned char *buf, unsigned long len);
503 int (*write)(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
504 unsigned char *buf, unsigned long len);
506 /* Add new things just above here ---^
507 * This is part of the ABI, don't needlessly break compatibility */
511 * NOTE: These public enums are part of the abi. If you want to add one,
512 * add it at where specified so existing users are unaffected.
514 enum lws_extension_callback_reasons {
515 LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT = 0,
516 LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT = 1,
517 LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT = 2,
518 LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT = 3,
519 LWS_EXT_CB_CONSTRUCT = 4,
520 LWS_EXT_CB_CLIENT_CONSTRUCT = 5,
521 LWS_EXT_CB_CHECK_OK_TO_REALLY_CLOSE = 6,
522 LWS_EXT_CB_CHECK_OK_TO_PROPOSE_EXTENSION = 7,
523 LWS_EXT_CB_DESTROY = 8,
524 LWS_EXT_CB_DESTROY_ANY_WSI_CLOSING = 9,
525 LWS_EXT_CB_ANY_WSI_ESTABLISHED = 10,
526 LWS_EXT_CB_PACKET_RX_PREPARSE = 11,
527 LWS_EXT_CB_PACKET_TX_PRESEND = 12,
528 LWS_EXT_CB_PACKET_TX_DO_SEND = 13,
529 LWS_EXT_CB_HANDSHAKE_REPLY_TX = 14,
530 LWS_EXT_CB_FLUSH_PENDING_TX = 15,
531 LWS_EXT_CB_EXTENDED_PAYLOAD_RX = 16,
532 LWS_EXT_CB_CAN_PROXY_CLIENT_CONNECTION = 17,
534 LWS_EXT_CB_REQUEST_ON_WRITEABLE = 19,
535 LWS_EXT_CB_IS_WRITEABLE = 20,
536 LWS_EXT_CB_PAYLOAD_TX = 21,
537 LWS_EXT_CB_PAYLOAD_RX = 22,
538 LWS_EXT_CB_OPTION_DEFAULT = 23,
539 LWS_EXT_CB_OPTION_SET = 24,
540 LWS_EXT_CB_OPTION_CONFIRM = 25,
541 LWS_EXT_CB_NAMED_OPTION_SET = 26,
543 /****** add new things just above ---^ ******/
547 * NOTE: These public enums are part of the abi. If you want to add one,
548 * add it at where specified so existing users are unaffected.
550 enum lws_write_protocol {
552 LWS_WRITE_BINARY = 1,
553 LWS_WRITE_CONTINUATION = 2,
556 /* special 04+ opcodes */
558 /* LWS_WRITE_CLOSE is handled by lws_close_reason() */
562 /* Same as write_http but we know this write ends the transaction */
563 LWS_WRITE_HTTP_FINAL = 7,
567 LWS_WRITE_HTTP_HEADERS = 8,
569 /****** add new things just above ---^ ******/
573 LWS_WRITE_NO_FIN = 0x40,
575 * client packet payload goes out on wire unmunged
576 * only useful for security tests since normal servers cannot
577 * decode the content if used
579 LWS_WRITE_CLIENT_IGNORE_XOR_MASK = 0x80
583 * you need these to look at headers that have been parsed if using the
584 * LWS_CALLBACK_FILTER_CONNECTION callback. If a header from the enum
585 * list below is absent, .token = NULL and token_len = 0. Otherwise .token
586 * points to .token_len chars containing that header content.
595 * these have to be kept in sync with lextable.h / minilex.c
597 * NOTE: These public enums are part of the abi. If you want to add one,
598 * add it at where specified so existing users are unaffected.
600 enum lws_token_indexes {
601 WSI_TOKEN_GET_URI = 0,
602 WSI_TOKEN_POST_URI = 1,
603 WSI_TOKEN_OPTIONS_URI = 2,
605 WSI_TOKEN_CONNECTION = 4,
606 WSI_TOKEN_UPGRADE = 5,
607 WSI_TOKEN_ORIGIN = 6,
609 WSI_TOKEN_CHALLENGE = 8,
610 WSI_TOKEN_EXTENSIONS = 9,
613 WSI_TOKEN_PROTOCOL = 12,
614 WSI_TOKEN_ACCEPT = 13,
615 WSI_TOKEN_NONCE = 14,
617 WSI_TOKEN_HTTP2_SETTINGS = 16,
618 WSI_TOKEN_HTTP_ACCEPT = 17,
619 WSI_TOKEN_HTTP_AC_REQUEST_HEADERS = 18,
620 WSI_TOKEN_HTTP_IF_MODIFIED_SINCE = 19,
621 WSI_TOKEN_HTTP_IF_NONE_MATCH = 20,
622 WSI_TOKEN_HTTP_ACCEPT_ENCODING = 21,
623 WSI_TOKEN_HTTP_ACCEPT_LANGUAGE = 22,
624 WSI_TOKEN_HTTP_PRAGMA = 23,
625 WSI_TOKEN_HTTP_CACHE_CONTROL = 24,
626 WSI_TOKEN_HTTP_AUTHORIZATION = 25,
627 WSI_TOKEN_HTTP_COOKIE = 26,
628 WSI_TOKEN_HTTP_CONTENT_LENGTH = 27,
629 WSI_TOKEN_HTTP_CONTENT_TYPE = 28,
630 WSI_TOKEN_HTTP_DATE = 29,
631 WSI_TOKEN_HTTP_RANGE = 30,
632 WSI_TOKEN_HTTP_REFERER = 31,
634 WSI_TOKEN_VERSION = 33,
635 WSI_TOKEN_SWORIGIN = 34,
637 WSI_TOKEN_HTTP_COLON_AUTHORITY = 35,
638 WSI_TOKEN_HTTP_COLON_METHOD = 36,
639 WSI_TOKEN_HTTP_COLON_PATH = 37,
640 WSI_TOKEN_HTTP_COLON_SCHEME = 38,
641 WSI_TOKEN_HTTP_COLON_STATUS = 39,
643 WSI_TOKEN_HTTP_ACCEPT_CHARSET = 40,
644 WSI_TOKEN_HTTP_ACCEPT_RANGES = 41,
645 WSI_TOKEN_HTTP_ACCESS_CONTROL_ALLOW_ORIGIN = 42,
646 WSI_TOKEN_HTTP_AGE = 43,
647 WSI_TOKEN_HTTP_ALLOW = 44,
648 WSI_TOKEN_HTTP_CONTENT_DISPOSITION = 45,
649 WSI_TOKEN_HTTP_CONTENT_ENCODING = 46,
650 WSI_TOKEN_HTTP_CONTENT_LANGUAGE = 47,
651 WSI_TOKEN_HTTP_CONTENT_LOCATION = 48,
652 WSI_TOKEN_HTTP_CONTENT_RANGE = 49,
653 WSI_TOKEN_HTTP_ETAG = 50,
654 WSI_TOKEN_HTTP_EXPECT = 51,
655 WSI_TOKEN_HTTP_EXPIRES = 52,
656 WSI_TOKEN_HTTP_FROM = 53,
657 WSI_TOKEN_HTTP_IF_MATCH = 54,
658 WSI_TOKEN_HTTP_IF_RANGE = 55,
659 WSI_TOKEN_HTTP_IF_UNMODIFIED_SINCE = 56,
660 WSI_TOKEN_HTTP_LAST_MODIFIED = 57,
661 WSI_TOKEN_HTTP_LINK = 58,
662 WSI_TOKEN_HTTP_LOCATION = 59,
663 WSI_TOKEN_HTTP_MAX_FORWARDS = 60,
664 WSI_TOKEN_HTTP_PROXY_AUTHENTICATE = 61,
665 WSI_TOKEN_HTTP_PROXY_AUTHORIZATION = 62,
666 WSI_TOKEN_HTTP_REFRESH = 63,
667 WSI_TOKEN_HTTP_RETRY_AFTER = 64,
668 WSI_TOKEN_HTTP_SERVER = 65,
669 WSI_TOKEN_HTTP_SET_COOKIE = 66,
670 WSI_TOKEN_HTTP_STRICT_TRANSPORT_SECURITY = 67,
671 WSI_TOKEN_HTTP_TRANSFER_ENCODING = 68,
672 WSI_TOKEN_HTTP_USER_AGENT = 69,
673 WSI_TOKEN_HTTP_VARY = 70,
674 WSI_TOKEN_HTTP_VIA = 71,
675 WSI_TOKEN_HTTP_WWW_AUTHENTICATE = 72,
677 WSI_TOKEN_PATCH_URI = 73,
678 WSI_TOKEN_PUT_URI = 74,
679 WSI_TOKEN_DELETE_URI = 75,
681 WSI_TOKEN_HTTP_URI_ARGS = 76,
682 WSI_TOKEN_PROXY = 77,
683 WSI_TOKEN_HTTP_X_REAL_IP = 78,
684 WSI_TOKEN_HTTP1_0 = 79,
686 /****** add new things just above ---^ ******/
688 /* use token storage to stash these internally, not for
691 _WSI_TOKEN_CLIENT_SENT_PROTOCOLS,
692 _WSI_TOKEN_CLIENT_PEER_ADDRESS,
693 _WSI_TOKEN_CLIENT_URI,
694 _WSI_TOKEN_CLIENT_HOST,
695 _WSI_TOKEN_CLIENT_ORIGIN,
696 _WSI_TOKEN_CLIENT_METHOD,
698 /* always last real token index*/
701 /* parser state additions, no storage associated */
704 WSI_TOKEN_SKIPPING_SAW_CR,
705 WSI_PARSING_COMPLETE,
706 WSI_INIT_TOKEN_MUXURL,
709 struct lws_token_limits {
710 unsigned short token_limit[WSI_TOKEN_COUNT];
717 1000 indicates a normal closure, meaning that the purpose for
718 which the connection was established has been fulfilled.
722 1001 indicates that an endpoint is "going away", such as a server
723 going down or a browser having navigated away from a page.
727 1002 indicates that an endpoint is terminating the connection due
732 1003 indicates that an endpoint is terminating the connection
733 because it has received a type of data it cannot accept (e.g., an
734 endpoint that understands only text data MAY send this if it
735 receives a binary message).
739 Reserved. The specific meaning might be defined in the future.
743 1005 is a reserved value and MUST NOT be set as a status code in a
744 Close control frame by an endpoint. It is designated for use in
745 applications expecting a status code to indicate that no status
746 code was actually present.
750 1006 is a reserved value and MUST NOT be set as a status code in a
751 Close control frame by an endpoint. It is designated for use in
752 applications expecting a status code to indicate that the
753 connection was closed abnormally, e.g., without sending or
754 receiving a Close control frame.
758 1007 indicates that an endpoint is terminating the connection
759 because it has received data within a message that was not
760 consistent with the type of the message (e.g., non-UTF-8 [RFC3629]
761 data within a text message).
765 1008 indicates that an endpoint is terminating the connection
766 because it has received a message that violates its policy. This
767 is a generic status code that can be returned when there is no
768 other more suitable status code (e.g., 1003 or 1009) or if there
769 is a need to hide specific details about the policy.
773 1009 indicates that an endpoint is terminating the connection
774 because it has received a message that is too big for it to
779 1010 indicates that an endpoint (client) is terminating the
780 connection because it has expected the server to negotiate one or
781 more extension, but the server didn't return them in the response
782 message of the WebSocket handshake. The list of extensions that
783 are needed SHOULD appear in the /reason/ part of the Close frame.
784 Note that this status code is not used by the server, because it
785 can fail the WebSocket handshake instead.
789 1011 indicates that a server is terminating the connection because
790 it encountered an unexpected condition that prevented it from
791 fulfilling the request.
795 1015 is a reserved value and MUST NOT be set as a status code in a
796 Close control frame by an endpoint. It is designated for use in
797 applications expecting a status code to indicate that the
798 connection was closed due to a failure to perform a TLS handshake
799 (e.g., the server certificate can't be verified).
803 * NOTE: These public enums are part of the abi. If you want to add one,
804 * add it at where specified so existing users are unaffected.
806 enum lws_close_status {
807 LWS_CLOSE_STATUS_NOSTATUS = 0,
808 LWS_CLOSE_STATUS_NORMAL = 1000,
809 LWS_CLOSE_STATUS_GOINGAWAY = 1001,
810 LWS_CLOSE_STATUS_PROTOCOL_ERR = 1002,
811 LWS_CLOSE_STATUS_UNACCEPTABLE_OPCODE = 1003,
812 LWS_CLOSE_STATUS_RESERVED = 1004,
813 LWS_CLOSE_STATUS_NO_STATUS = 1005,
814 LWS_CLOSE_STATUS_ABNORMAL_CLOSE = 1006,
815 LWS_CLOSE_STATUS_INVALID_PAYLOAD = 1007,
816 LWS_CLOSE_STATUS_POLICY_VIOLATION = 1008,
817 LWS_CLOSE_STATUS_MESSAGE_TOO_LARGE = 1009,
818 LWS_CLOSE_STATUS_EXTENSION_REQUIRED = 1010,
819 LWS_CLOSE_STATUS_UNEXPECTED_CONDITION = 1011,
820 LWS_CLOSE_STATUS_TLS_FAILURE = 1015,
822 /****** add new things just above ---^ ******/
824 LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY = 9999,
828 HTTP_STATUS_OK = 200,
829 HTTP_STATUS_NO_CONTENT = 204,
831 HTTP_STATUS_MOVED_PERMANENTLY = 301,
832 HTTP_STATUS_FOUND = 302,
833 HTTP_STATUS_SEE_OTHER = 303,
835 HTTP_STATUS_BAD_REQUEST = 400,
836 HTTP_STATUS_UNAUTHORIZED,
837 HTTP_STATUS_PAYMENT_REQUIRED,
838 HTTP_STATUS_FORBIDDEN,
839 HTTP_STATUS_NOT_FOUND,
840 HTTP_STATUS_METHOD_NOT_ALLOWED,
841 HTTP_STATUS_NOT_ACCEPTABLE,
842 HTTP_STATUS_PROXY_AUTH_REQUIRED,
843 HTTP_STATUS_REQUEST_TIMEOUT,
844 HTTP_STATUS_CONFLICT,
846 HTTP_STATUS_LENGTH_REQUIRED,
847 HTTP_STATUS_PRECONDITION_FAILED,
848 HTTP_STATUS_REQ_ENTITY_TOO_LARGE,
849 HTTP_STATUS_REQ_URI_TOO_LONG,
850 HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE,
851 HTTP_STATUS_REQ_RANGE_NOT_SATISFIABLE,
852 HTTP_STATUS_EXPECTATION_FAILED,
854 HTTP_STATUS_INTERNAL_SERVER_ERROR = 500,
855 HTTP_STATUS_NOT_IMPLEMENTED,
856 HTTP_STATUS_BAD_GATEWAY,
857 HTTP_STATUS_SERVICE_UNAVAILABLE,
858 HTTP_STATUS_GATEWAY_TIMEOUT,
859 HTTP_STATUS_HTTP_VERSION_NOT_SUPPORTED,
864 /* needed even with extensions disabled for create context */
865 struct lws_extension;
868 * typedef lws_callback_function() - User server actions
869 * @wsi: Opaque websocket instance pointer
870 * @reason: The reason for the call
871 * @user: Pointer to per-session user data allocated by library
872 * @in: Pointer used for some callback reasons
873 * @len: Length set for some callback reasons
875 * This callback is the way the user controls what is served. All the
876 * protocol detail is hidden and handled by the library.
878 * For each connection / session there is user data allocated that is
879 * pointed to by "user". You set the size of this user data area when
880 * the library is initialized with lws_create_server.
882 * You get an opportunity to initialize user data when called back with
883 * LWS_CALLBACK_ESTABLISHED reason.
885 * LWS_CALLBACK_ESTABLISHED: after the server completes a handshake with
886 * an incoming client. If you built the library
887 * with ssl support, @in is a pointer to the
888 * ssl struct associated with the connection or
891 * LWS_CALLBACK_CLIENT_CONNECTION_ERROR: the request client connection has
892 * been unable to complete a handshake with the remote server. If
893 * in is non-NULL, you can find an error string of length len where
896 * LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH: this is the last chance for the
897 * client user code to examine the http headers
898 * and decide to reject the connection. If the
899 * content in the headers is interesting to the
900 * client (url, etc) it needs to copy it out at
901 * this point since it will be destroyed before
902 * the CLIENT_ESTABLISHED call
904 * LWS_CALLBACK_CLIENT_ESTABLISHED: after your client connection completed
905 * a handshake with the remote server
907 * LWS_CALLBACK_CLOSED: when the websocket session ends
909 * LWS_CALLBACK_CLOSED_HTTP: when a HTTP (non-websocket) session ends
911 * LWS_CALLBACK_RECEIVE: data has appeared for this server endpoint from a
912 * remote client, it can be found at *in and is
915 * LWS_CALLBACK_CLIENT_RECEIVE_PONG: if you elected to see PONG packets,
916 * they appear with this callback reason. PONG
917 * packets only exist in 04+ protocol
919 * LWS_CALLBACK_CLIENT_RECEIVE: data has appeared from the server for the
920 * client connection, it can be found at *in and
923 * LWS_CALLBACK_HTTP: an http request has come from a client that is not
924 * asking to upgrade the connection to a websocket
925 * one. This is a chance to serve http content,
926 * for example, to send a script to the client
927 * which will then open the websockets connection.
928 * @in points to the URI path requested and
929 * lws_serve_http_file() makes it very
930 * simple to send back a file to the client.
931 * Normally after sending the file you are done
932 * with the http connection, since the rest of the
933 * activity will come by websockets from the script
934 * that was delivered by http, so you will want to
935 * return 1; to close and free up the connection.
936 * That's important because it uses a slot in the
937 * total number of client connections allowed set
940 * LWS_CALLBACK_HTTP_BODY: the next @len bytes data from the http
941 * request body HTTP connection is now available in @in.
943 * LWS_CALLBACK_HTTP_BODY_COMPLETION: the expected amount of http request
944 * body has been delivered
946 * LWS_CALLBACK_HTTP_WRITEABLE: you can write more down the http protocol
949 * LWS_CALLBACK_HTTP_FILE_COMPLETION: a file requested to be send down
950 * http link has completed.
952 * LWS_CALLBACK_CLIENT_WRITEABLE:
953 * LWS_CALLBACK_SERVER_WRITEABLE: If you call
954 * lws_callback_on_writable() on a connection, you will
955 * get one of these callbacks coming when the connection socket
956 * is able to accept another write packet without blocking.
957 * If it already was able to take another packet without blocking,
958 * you'll get this callback at the next call to the service loop
959 * function. Notice that CLIENTs get LWS_CALLBACK_CLIENT_WRITEABLE
960 * and servers get LWS_CALLBACK_SERVER_WRITEABLE.
962 * LWS_CALLBACK_FILTER_NETWORK_CONNECTION: called when a client connects to
963 * the server at network level; the connection is accepted but then
964 * passed to this callback to decide whether to hang up immediately
965 * or not, based on the client IP. @in contains the connection
966 * socket's descriptor. Since the client connection information is
967 * not available yet, @wsi still pointing to the main server socket.
968 * Return non-zero to terminate the connection before sending or
969 * receiving anything. Because this happens immediately after the
970 * network connection from the client, there's no websocket protocol
971 * selected yet so this callback is issued only to protocol 0.
973 * LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED: A new client just had
974 * been connected, accepted, and instantiated into the pool. This
975 * callback allows setting any relevant property to it. Because this
976 * happens immediately after the instantiation of a new client,
977 * there's no websocket protocol selected yet so this callback is
978 * issued only to protocol 0. Only @wsi is defined, pointing to the
979 * new client, and the return value is ignored.
981 * LWS_CALLBACK_FILTER_HTTP_CONNECTION: called when the request has
982 * been received and parsed from the client, but the response is
983 * not sent yet. Return non-zero to disallow the connection.
984 * @user is a pointer to the connection user space allocation,
985 * @in is the URI, eg, "/"
986 * In your handler you can use the public APIs
987 * lws_hdr_total_length() / lws_hdr_copy() to access all of the
988 * headers using the header enums lws_token_indexes from
989 * libwebsockets.h to check for and read the supported header
990 * presence and content before deciding to allow the http
991 * connection to proceed or to kill the connection.
993 * LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION: called when the handshake has
994 * been received and parsed from the client, but the response is
995 * not sent yet. Return non-zero to disallow the connection.
996 * @user is a pointer to the connection user space allocation,
997 * @in is the requested protocol name
998 * In your handler you can use the public APIs
999 * lws_hdr_total_length() / lws_hdr_copy() to access all of the
1000 * headers using the header enums lws_token_indexes from
1001 * libwebsockets.h to check for and read the supported header
1002 * presence and content before deciding to allow the handshake
1003 * to proceed or to kill the connection.
1005 * LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS: if configured for
1006 * including OpenSSL support, this callback allows your user code
1007 * to perform extra SSL_CTX_load_verify_locations() or similar
1008 * calls to direct OpenSSL where to find certificates the client
1009 * can use to confirm the remote server identity. @user is the
1012 * LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS: if configured for
1013 * including OpenSSL support, this callback allows your user code
1014 * to load extra certifcates into the server which allow it to
1015 * verify the validity of certificates returned by clients. @user
1016 * is the server's OpenSSL SSL_CTX*
1018 * LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY: if configured for
1019 * including OpenSSL support but no private key file has been
1020 * specified (ssl_private_key_filepath is NULL), this is called to
1021 * allow the user to set the private key directly via libopenssl
1022 * and perform further operations if required; this might be useful
1023 * in situations where the private key is not directly accessible
1024 * by the OS, for example if it is stored on a smartcard
1025 * @user is the server's OpenSSL SSL_CTX*
1027 * LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION: if the
1028 * libwebsockets context was created with the option
1029 * LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT, then this
1030 * callback is generated during OpenSSL verification of the cert
1031 * sent from the client. It is sent to protocol[0] callback as
1032 * no protocol has been negotiated on the connection yet.
1033 * Notice that the libwebsockets context and wsi are both NULL
1034 * during this callback. See
1035 * http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html
1036 * to understand more detail about the OpenSSL callback that
1037 * generates this libwebsockets callback and the meanings of the
1038 * arguments passed. In this callback, @user is the x509_ctx,
1039 * @in is the ssl pointer and @len is preverify_ok
1040 * Notice that this callback maintains libwebsocket return
1041 * conventions, return 0 to mean the cert is OK or 1 to fail it.
1042 * This also means that if you don't handle this callback then
1043 * the default callback action of returning 0 allows the client
1046 * LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER: this callback happens
1047 * when a client handshake is being compiled. @user is NULL,
1048 * @in is a char **, it's pointing to a char * which holds the
1049 * next location in the header buffer where you can add
1050 * headers, and @len is the remaining space in the header buffer,
1051 * which is typically some hundreds of bytes. So, to add a canned
1052 * cookie, your handler code might look similar to:
1054 * char **p = (char **)in;
1059 * *p += sprintf(*p, "Cookie: a=b\x0d\x0a");
1063 * Notice if you add anything, you just have to take care about
1064 * the CRLF on the line you added. Obviously this callback is
1065 * optional, if you don't handle it everything is fine.
1067 * Notice the callback is coming to protocols[0] all the time,
1068 * because there is no specific protocol handshook yet.
1070 * LWS_CALLBACK_CONFIRM_EXTENSION_OKAY: When the server handshake code
1071 * sees that it does support a requested extension, before
1072 * accepting the extension by additing to the list sent back to
1073 * the client it gives this callback just to check that it's okay
1074 * to use that extension. It calls back to the requested protocol
1075 * and with @in being the extension name, @len is 0 and @user is
1076 * valid. Note though at this time the ESTABLISHED callback hasn't
1077 * happened yet so if you initialize @user content there, @user
1078 * content during this callback might not be useful for anything.
1079 * Notice this callback comes to protocols[0].
1081 * LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED: When a client
1082 * connection is being prepared to start a handshake to a server,
1083 * each supported extension is checked with protocols[0] callback
1084 * with this reason, giving the user code a chance to suppress the
1085 * claim to support that extension by returning non-zero. If
1086 * unhandled, by default 0 will be returned and the extension
1087 * support included in the header to the server. Notice this
1088 * callback comes to protocols[0].
1090 * LWS_CALLBACK_PROTOCOL_INIT: One-time call per protocol so it can
1091 * do initial setup / allocations etc
1093 * LWS_CALLBACK_PROTOCOL_DESTROY: One-time call per protocol indicating
1094 * this protocol won't get used at all after this callback, the
1095 * context is getting destroyed. Take the opportunity to
1096 * deallocate everything that was allocated by the protocol.
1098 * LWS_CALLBACK_WSI_CREATE: outermost (earliest) wsi create notification
1100 * LWS_CALLBACK_WSI_DESTROY: outermost (latest) wsi destroy notification
1102 * The next five reasons are optional and only need taking care of if you
1103 * will be integrating libwebsockets sockets into an external polling
1106 * For these calls, @in points to a struct lws_pollargs that
1107 * contains @fd, @events and @prev_events members
1109 * LWS_CALLBACK_ADD_POLL_FD: libwebsocket deals with its poll() loop
1110 * internally, but in the case you are integrating with another
1111 * server you will need to have libwebsocket sockets share a
1112 * polling array with the other server. This and the other
1113 * POLL_FD related callbacks let you put your specialized
1114 * poll array interface code in the callback for protocol 0, the
1115 * first protocol you support, usually the HTTP protocol in the
1117 * This callback happens when a socket needs to be
1118 * added to the polling loop: @in points to a struct
1119 * lws_pollargs; the @fd member of the struct is the file
1120 * descriptor, and @events contains the active events.
1122 * If you are using the internal polling loop (the "service"
1123 * callback), you can just ignore these callbacks.
1125 * LWS_CALLBACK_DEL_POLL_FD: This callback happens when a socket descriptor
1126 * needs to be removed from an external polling array. @in is
1127 * again the struct lws_pollargs containing the @fd member
1128 * to be removed. If you are using the internal polling
1129 * loop, you can just ignore it.
1131 * LWS_CALLBACK_CHANGE_MODE_POLL_FD: This callback happens when
1132 * libwebsockets wants to modify the events for a connectiion.
1133 * @in is the struct lws_pollargs with the @fd to change.
1134 * The new event mask is in @events member and the old mask is in
1135 * the @prev_events member.
1136 * If you are using the internal polling loop, you can just ignore
1139 * LWS_CALLBACK_LOCK_POLL:
1140 * LWS_CALLBACK_UNLOCK_POLL: These allow the external poll changes driven
1141 * by libwebsockets to participate in an external thread locking
1142 * scheme around the changes, so the whole thing is threadsafe.
1143 * These are called around three activities in the library,
1144 * - inserting a new wsi in the wsi / fd table (len=1)
1145 * - deleting a wsi from the wsi / fd table (len=1)
1146 * - changing a wsi's POLLIN/OUT state (len=0)
1147 * Locking and unlocking external synchronization objects when
1148 * len == 1 allows external threads to be synchronized against
1149 * wsi lifecycle changes if it acquires the same lock for the
1150 * duration of wsi dereference from the other thread context.
1152 * LWS_CALLBACK_WS_PEER_INITIATED_CLOSE:
1153 * The peer has sent an unsolicited Close WS packet. @in and
1154 * @len are the optional close code (first 2 bytes, network
1155 * order) and the optional additional information which is not
1156 * defined in the standard, and may be a string or non-human-
1158 * If you return 0 lws will echo the close and then close the
1159 * connection. If you return nonzero lws will just close the
1163 lws_callback_function(struct lws *wsi, enum lws_callback_reasons reason,
1164 void *user, void *in, size_t len);
1167 * typedef lws_extension_callback_function() - Hooks to allow extensions to operate
1168 * @context: Websockets context
1169 * @ext: This extension
1170 * @wsi: Opaque websocket instance pointer
1171 * @reason: The reason for the call
1172 * @user: Pointer to ptr to per-session user data allocated by library
1173 * @in: Pointer used for some callback reasons
1174 * @len: Length set for some callback reasons
1176 * Each extension that is active on a particular connection receives
1177 * callbacks during the connection lifetime to allow the extension to
1178 * operate on websocket data and manage itself.
1180 * Libwebsockets takes care of allocating and freeing "user" memory for
1181 * each active extension on each connection. That is what is pointed to
1182 * by the @user parameter.
1184 * LWS_EXT_CB_CONSTRUCT: called when the server has decided to
1185 * select this extension from the list provided by the client,
1186 * just before the server will send back the handshake accepting
1187 * the connection with this extension active. This gives the
1188 * extension a chance to initialize its connection context found
1191 * LWS_EXT_CB_CLIENT_CONSTRUCT: same as LWS_EXT_CB_CONSTRUCT
1192 * but called when client is instantiating this extension. Some
1193 * extensions will work the same on client and server side and then
1194 * you can just merge handlers for both CONSTRUCTS.
1196 * LWS_EXT_CB_DESTROY: called when the connection the extension was
1197 * being used on is about to be closed and deallocated. It's the
1198 * last chance for the extension to deallocate anything it has
1199 * allocated in the user data (pointed to by @user) before the
1200 * user data is deleted. This same callback is used whether you
1201 * are in client or server instantiation context.
1203 * LWS_EXT_CB_PACKET_RX_PREPARSE: when this extension was active on
1204 * a connection, and a packet of data arrived at the connection,
1205 * it is passed to this callback to give the extension a chance to
1206 * change the data, eg, decompress it. @user is pointing to the
1207 * extension's private connection context data, @in is pointing
1208 * to an lws_tokens struct, it consists of a char * pointer called
1209 * token, and an int called token_len. At entry, these are
1210 * set to point to the received buffer and set to the content
1211 * length. If the extension will grow the content, it should use
1212 * a new buffer allocated in its private user context data and
1213 * set the pointed-to lws_tokens members to point to its buffer.
1215 * LWS_EXT_CB_PACKET_TX_PRESEND: this works the same way as
1216 * LWS_EXT_CB_PACKET_RX_PREPARSE above, except it gives the
1217 * extension a chance to change websocket data just before it will
1218 * be sent out. Using the same lws_token pointer scheme in @in,
1219 * the extension can change the buffer and the length to be
1220 * transmitted how it likes. Again if it wants to grow the
1221 * buffer safely, it should copy the data into its own buffer and
1222 * set the lws_tokens token pointer to it.
1224 * LWS_EXT_CB_ARGS_VALIDATE:
1227 lws_extension_callback_function(struct lws_context *context,
1228 const struct lws_extension *ext, struct lws *wsi,
1229 enum lws_extension_callback_reasons reason,
1230 void *user, void *in, size_t len);
1233 * struct lws_protocols - List of protocols and handlers server
1235 * @name: Protocol name that must match the one given in the client
1236 * Javascript new WebSocket(url, 'protocol') name.
1237 * @callback: The service callback used for this protocol. It allows the
1238 * service action for an entire protocol to be encapsulated in
1239 * the protocol-specific callback
1240 * @per_session_data_size: Each new connection using this protocol gets
1241 * this much memory allocated on connection establishment and
1242 * freed on connection takedown. A pointer to this per-connection
1243 * allocation is passed into the callback in the 'user' parameter
1244 * @rx_buffer_size: if you want atomic frames delivered to the callback, you
1245 * should set this to the size of the biggest legal frame that
1246 * you support. If the frame size is exceeded, there is no
1247 * error, but the buffer will spill to the user callback when
1248 * full, which you can detect by using
1249 * lws_remaining_packet_payload(). Notice that you
1250 * just talk about frame size here, the LWS_PRE
1251 * and post-padding are automatically also allocated on top.
1252 * @id: ignored by lws, but useful to contain user information bound
1253 * to the selected protocol. For example if this protocol was
1254 * called "myprotocol-v2", you might set id to 2, and the user
1255 * code that acts differently according to the version can do so by
1256 * switch (wsi->protocol->id), user code might use some bits as
1257 * capability flags based on selected protocol version, etc.
1258 * @user: User provided context data at the protocol level.
1259 * Accessible via lws_get_protocol(wsi)->user
1260 * This should not be confused with wsi->user, it is not the same.
1261 * The library completely ignores any value in here.
1263 * This structure represents one protocol supported by the server. An
1264 * array of these structures is passed to lws_create_server()
1265 * allows as many protocols as you like to be handled by one server.
1267 * The first protocol given has its callback used for user callbacks when
1268 * there is no agreed protocol name, that's true during HTTP part of the
1269 * connection and true if the client did not send a Protocol: header.
1272 struct lws_protocols {
1274 lws_callback_function *callback;
1275 size_t per_session_data_size;
1276 size_t rx_buffer_size;
1280 /* Add new things just above here ---^
1281 * This is part of the ABI, don't needlessly break compatibility */
1284 enum lws_ext_options_types {
1289 /* Add new things just above here ---^
1290 * This is part of the ABI, don't needlessly break compatibility */
1294 * struct lws_ext_options - Option arguments to the extension. These are
1295 * used in the negotiation at ws upgrade time.
1296 * The helper function lws_ext_parse_options()
1297 * uses these to generate callbacks
1299 * @name: Option name, eg, "server_no_context_takeover"
1300 * @type: What kind of args the option can take
1302 struct lws_ext_options {
1304 enum lws_ext_options_types type;
1306 /* Add new things just above here ---^
1307 * This is part of the ABI, don't needlessly break compatibility */
1310 struct lws_ext_option_arg {
1311 const char *option_name; /* may be NULL, option_index used then */
1318 * struct lws_extension - An extension we know how to cope with
1320 * @name: Formal extension name, eg, "permessage-deflate"
1321 * @callback: Service callback
1322 * @client_offer: String containing exts and options client offers
1325 struct lws_extension {
1327 lws_extension_callback_function *callback;
1328 const char *client_offer;
1330 /* Add new things just above here ---^
1331 * This is part of the ABI, don't needlessly break compatibility */
1335 #ifdef LWS_WITH_PLUGINS
1337 /* PLUGINS implies LIBUV */
1339 #define LWS_PLUGIN_API_MAGIC 180
1341 struct lws_plugin_capability {
1342 unsigned int api_magic; /* caller fills this in, plugin fills rest */
1343 const struct lws_protocols *protocols;
1344 int count_protocols;
1345 const struct lws_extension *extensions;
1346 int count_extensions;
1349 typedef int (*lws_plugin_init_func)(struct lws_context *,
1350 struct lws_plugin_capability *);
1351 typedef int (*lws_plugin_destroy_func)(struct lws_context *);
1353 struct lws_plugin *list;
1354 #if (UV_VERSION_MAJOR > 0)
1360 struct lws_plugin_capability caps;
1366 * The internal exts are part of the public abi
1367 * If we add more extensions, publish the callback here ------v
1371 int lws_extension_callback_pm_deflate(
1372 struct lws_context *context, const struct lws_extension *ext,
1373 struct lws *wsi, enum lws_extension_callback_reasons reason,
1374 void *user, void *in, size_t len);
1376 LWS_VISIBLE LWS_EXTERN int
1377 lws_set_extension_option(struct lws *wsi, const char *ext_name,
1378 const char *opt_name, const char *opt_val);
1380 struct lws_protocol_vhost_options {
1381 const struct lws_protocol_vhost_options *next;
1382 const struct lws_protocol_vhost_options *options;
1387 struct lws_http_mount {
1388 struct lws_http_mount *mount_next;
1389 const char *mountpoint; /* mountpoint in http pathspace, eg, "/" */
1390 const char *origin; /* path to be mounted, eg, "/var/www/warmcat.com" */
1391 const char *def; /* default target, eg, "index.html" */
1393 const struct lws_protocol_vhost_options *cgienv;
1394 const struct lws_protocol_vhost_options *extra_mimetypes;
1399 unsigned int cache_reusable:1;
1400 unsigned int cache_revalidate:1;
1401 unsigned int cache_intermediaries:1;
1403 unsigned char origin_protocol;
1404 unsigned char mountpoint_len;
1408 * struct lws_context_creation_info - parameters to create context with
1410 * This is also used to create vhosts.... if LWS_SERVER_OPTION_EXPLICIT_VHOSTS
1411 * is not given, then for backwards compatibility one vhost is created at
1412 * context-creation time using the info from this struct.
1414 * If LWS_SERVER_OPTION_EXPLICIT_VHOSTS is given, then no vhosts are created
1415 * at the same time as the context, they are expected to be created afterwards.
1417 * @port: VHOST: Port to listen on... you can use CONTEXT_PORT_NO_LISTEN to
1418 * suppress listening on any port, that's what you want if you are
1419 * not running a websocket server at all but just using it as a
1421 * @iface: VHOST: NULL to bind the listen socket to all interfaces, or the
1422 * interface name, eg, "eth2"
1423 * If options specifies LWS_SERVER_OPTION_UNIX_SOCK, this member is
1424 * the pathname of a UNIX domain socket. you can use the UNIX domain
1425 * sockets in abstract namespace, by prepending an @ symbole to the
1427 * @protocols: VHOST: Array of structures listing supported protocols and a protocol-
1428 * specific callback for each one. The list is ended with an
1429 * entry that has a NULL callback pointer.
1430 * It's not const because we write the owning_server member
1431 * @extensions: VHOST: NULL or array of lws_extension structs listing the
1432 * extensions this context supports. If you configured with
1433 * --without-extensions, you should give NULL here.
1434 * @token_limits: CONTEXT: NULL or struct lws_token_limits pointer which is initialized
1435 * with a token length limit for each possible WSI_TOKEN_***
1436 * @ssl_cert_filepath: VHOST: If libwebsockets was compiled to use ssl, and you want
1437 * to listen using SSL, set to the filepath to fetch the
1438 * server cert from, otherwise NULL for unencrypted
1439 * @ssl_private_key_filepath: VHOST: filepath to private key if wanting SSL mode;
1440 * if this is set to NULL but sll_cert_filepath is set, the
1441 * OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY callback is called
1442 * to allow setting of the private key directly via openSSL
1444 * @ssl_ca_filepath: VHOST: CA certificate filepath or NULL
1445 * @ssl_cipher_list: VHOST: List of valid ciphers to use (eg,
1446 * "RC4-MD5:RC4-SHA:AES128-SHA:AES256-SHA:HIGH:!DSS:!aNULL"
1447 * or you can leave it as NULL to get "DEFAULT"
1448 * @http_proxy_address: VHOST: If non-NULL, attempts to proxy via the given address.
1449 * If proxy auth is required, use format
1450 * "username:password@server:port"
1451 * @http_proxy_port: VHOST: If http_proxy_address was non-NULL, uses this port at
1453 * @gid: CONTEXT: group id to change to after setting listen socket, or -1.
1454 * @uid: CONTEXT: user id to change to after setting listen socket, or -1.
1455 * @options: VHOST + CONTEXT: 0, or LWS_SERVER_OPTION_... bitfields
1456 * @user: CONTEXT: optional user pointer that can be recovered via the context
1457 * pointer using lws_context_user
1458 * @ka_time: CONTEXT: 0 for no keepalive, otherwise apply this keepalive timeout to
1459 * all libwebsocket sockets, client or server
1460 * @ka_probes: CONTEXT: if ka_time was nonzero, after the timeout expires how many
1461 * times to try to get a response from the peer before giving up
1462 * and killing the connection
1463 * @ka_interval: CONTEXT: if ka_time was nonzero, how long to wait before each ka_probes
1465 * @provided_client_ssl_ctx: CONTEXT: If non-null, swap out libwebsockets ssl
1466 * implementation for the one provided by provided_ssl_ctx.
1467 * Libwebsockets no longer is responsible for freeing the context
1468 * if this option is selected.
1469 * @max_http_header_data: CONTEXT: The max amount of header payload that can be handled
1470 * in an http request (unrecognized header payload is dropped)
1471 * @max_http_header_pool: CONTEXT: The max number of connections with http headers that
1472 * can be processed simultaneously (the corresponding memory is
1473 * allocated for the lifetime of the context). If the pool is
1474 * busy new incoming connections must wait for accept until one
1476 * @count_threads: CONTEXT: how many contexts to create in an array, 0 = 1
1477 * @fd_limit_per_thread: CONTEXT: nonzero means restrict each service thread to this
1478 * many fds, 0 means the default which is divide the process fd
1479 * limit by the number of threads.
1480 * @timeout_secs: VHOST: various processes involving network roundtrips in the
1481 * library are protected from hanging forever by timeouts. If
1482 * nonzero, this member lets you set the timeout used in seconds.
1483 * Otherwise a default timeout is used.
1484 * @ecdh_curve: VHOST: if NULL, defaults to initializing server with "prime256v1"
1485 * @vhost_name: VHOST: name of vhost, must match external DNS name used to
1486 * access the site, like "warmcat.com" as it's used to match
1487 * Host: header and / or SNI name for SSL.
1488 * @plugin_dirs: CONTEXT: NULL, or NULL-terminated array of directories to
1489 * scan for lws protocol plugins at context creation time
1490 * @pvo: VHOST: pointer to optional linked list of per-vhost
1491 * options made accessible to protocols
1492 * @keepalive_timeout: VHOST: (default = 0 = 60s) seconds to allow remote
1493 * client to hold on to an idle HTTP/1.1 connection
1494 * @log_filepath: VHOST: filepath to append logs to... this is opened before
1495 * any dropping of initial privileges
1496 * @mounts: VHOST: optional linked list of mounts for this vhost
1497 * @server_string: CONTEXT: string used in HTTP headers to identify server
1498 * software, if NULL, "libwebsockets".
1499 * @pt_serv_buf_size: CONTEXT: 0 = default of 4096. This buffer is used by
1500 * various service related features including file serving, it
1501 * defines the max chunk of file that can be sent at once.
1502 * At the risk of lws having to buffer failed large sends, it
1503 * can be increased to, eg, 128KiB to improve throughput.
1506 struct lws_context_creation_info {
1508 const char *iface; /* VH */
1509 const struct lws_protocols *protocols; /* VH */
1510 const struct lws_extension *extensions; /* VH */
1511 const struct lws_token_limits *token_limits; /* context */
1512 const char *ssl_private_key_password; /* VH */
1513 const char *ssl_cert_filepath; /* VH */
1514 const char *ssl_private_key_filepath; /* VH */
1515 const char *ssl_ca_filepath; /* VH */
1516 const char *ssl_cipher_list; /* VH */
1517 const char *http_proxy_address; /* VH */
1518 unsigned int http_proxy_port; /* VH */
1519 int gid; /* context */
1520 int uid; /* context */
1521 unsigned int options; /* VH + context */
1522 void *user; /* context */
1523 int ka_time; /* context */
1524 int ka_probes; /* context */
1525 int ka_interval; /* context */
1526 #ifdef LWS_OPENSSL_SUPPORT
1527 SSL_CTX *provided_client_ssl_ctx; /* context */
1528 #else /* maintain structure layout either way */
1529 void *provided_client_ssl_ctx;
1532 short max_http_header_data; /* context */
1533 short max_http_header_pool; /* context */
1535 unsigned int count_threads; /* context */
1536 unsigned int fd_limit_per_thread; /* context */
1537 unsigned int timeout_secs; /* VH */
1538 const char *ecdh_curve; /* VH */
1539 const char *vhost_name; /* VH */
1540 const char * const *plugin_dirs; /* context */
1541 const struct lws_protocol_vhost_options *pvo; /* VH */
1542 int keepalive_timeout; /* VH */
1543 const char *log_filepath; /* VH */
1544 const struct lws_http_mount *mounts; /* VH */
1545 const char *server_string; /* context */
1546 unsigned int pt_serv_buf_size; /* context */
1548 /* Add new things just above here ---^
1549 * This is part of the ABI, don't needlessly break compatibility
1551 * The below is to ensure later library versions with new
1552 * members added above will see 0 (default) even if the app
1553 * was not built against the newer headers.
1560 * struct lws_client_connect_info - parameters to connect with when using
1561 * lws_client_connect_via_info()
1563 * @context: lws context to create connection in
1564 * @address: remote address to connect to
1565 * @port: remote port to connect to
1566 * @ssl_connection: nonzero for ssl
1568 * @host: content of host header
1569 * @origin: content of origin header
1570 * @protocol: list of ws protocols
1571 * @ietf_version_or_minus_one: currently leave at 0 or -1
1572 * @userdata: if non-NULL, use this as wsi user_data instead of malloc it
1573 * @client_exts: array of extensions that may be used on connection
1574 * @method: if non-NULL, do this http method instead of ws[s] upgrade.
1575 * use "GET" to be a simple http client connection
1576 * @parent_wsi: if another wsi is responsible for this connection, give it here.
1577 * this is used to make sure if the parent closes so do any
1578 * child connections first.
1579 * @uri_replace_from: if non-NULL, when this string is found in URIs in
1580 * text/html content-encoding, it's replaced with @uri_replace_to
1581 * @uri_replace_to: see above
1582 * @vhost: vhost to bind to (used to determine related SSL_CTX)
1585 struct lws_client_connect_info {
1586 struct lws_context *context;
1587 const char *address;
1593 const char *protocol;
1594 int ietf_version_or_minus_one;
1596 const struct lws_extension *client_exts;
1598 struct lws *parent_wsi;
1599 const char *uri_replace_from;
1600 const char *uri_replace_to;
1601 struct lws_vhost *vhost;
1603 /* Add new things just above here ---^
1604 * This is part of the ABI, don't needlessly break compatibility
1606 * The below is to ensure later library versions with new
1607 * members added above will see 0 (default) even if the app
1608 * was not built against the newer headers.
1619 LWSMPRO_REDIR_HTTP = 4,
1620 LWSMPRO_REDIR_HTTPS = 5,
1621 LWSMPRO_CALLBACK = 6,
1624 LWS_VISIBLE LWS_EXTERN int
1625 lws_json_dump_vhost(const struct lws_vhost *vh, char *buf, int len);
1627 LWS_VISIBLE LWS_EXTERN int
1628 lws_json_dump_context(const struct lws_context *context, char *buf, int len);
1630 LWS_VISIBLE LWS_EXTERN void
1631 lws_set_log_level(int level,
1632 void (*log_emit_function)(int level, const char *line));
1634 LWS_VISIBLE LWS_EXTERN void
1635 lwsl_emit_syslog(int level, const char *line);
1637 LWS_VISIBLE LWS_EXTERN struct lws_context *
1638 lws_create_context(struct lws_context_creation_info *info);
1642 LWS_EXTERN LWS_VISIBLE struct lws_vhost *
1643 lws_create_vhost(struct lws_context *context,
1644 struct lws_context_creation_info *info);
1646 LWS_VISIBLE LWS_EXTERN int
1647 lws_init_vhost_client_ssl(const struct lws_context_creation_info *info,
1648 struct lws_vhost *vhost);
1650 /* deprecated: use lws_get_vhost() */
1651 LWS_VISIBLE LWS_EXTERN struct lws_vhost *
1652 lws_vhost_get(struct lws *wsi) LWS_WARN_DEPRECATED;
1654 LWS_VISIBLE LWS_EXTERN struct lws_vhost *
1655 lws_get_vhost(struct lws *wsi);
1657 /* deprecated: use lws_get_protocol */
1658 LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
1659 lws_protocol_get(struct lws *wsi) LWS_WARN_DEPRECATED;
1661 LWS_VISIBLE LWS_EXTERN void *
1662 lws_protocol_vh_priv_zalloc(struct lws_vhost *vhost, const struct lws_protocols *prot,
1664 LWS_VISIBLE LWS_EXTERN void *
1665 lws_protocol_vh_priv_get(struct lws_vhost *vhost, const struct lws_protocols *prot);
1667 LWS_VISIBLE LWS_EXTERN int
1668 lws_finalize_startup(struct lws_context *context);
1670 LWS_VISIBLE LWS_EXTERN int
1671 lws_set_proxy(struct lws_vhost *vhost, const char *proxy);
1673 LWS_VISIBLE LWS_EXTERN void
1674 lws_context_destroy(struct lws_context *context);
1676 LWS_VISIBLE LWS_EXTERN int
1677 lws_service(struct lws_context *context, int timeout_ms);
1679 LWS_VISIBLE LWS_EXTERN int
1680 lws_service_tsi(struct lws_context *context, int timeout_ms, int tsi);
1682 LWS_VISIBLE LWS_EXTERN void
1683 lws_cancel_service_pt(struct lws *wsi);
1685 LWS_VISIBLE LWS_EXTERN void
1686 lws_cancel_service(struct lws_context *context);
1688 LWS_VISIBLE LWS_EXTERN int
1689 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
1692 LWS_VISIBLE LWS_EXTERN const unsigned char *
1693 lws_token_to_string(enum lws_token_indexes token);
1695 /* all the below must be LWS_WARN_UNUSED_RESULT as they can run short */
1697 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1698 lws_add_http_header_by_name(struct lws *wsi, const unsigned char *name,
1699 const unsigned char *value, int length,
1700 unsigned char **p, unsigned char *end);
1701 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1702 lws_finalize_http_header(struct lws *wsi, unsigned char **p,
1703 unsigned char *end);
1704 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1705 lws_add_http_header_by_token(struct lws *wsi, enum lws_token_indexes token,
1706 const unsigned char *value, int length,
1707 unsigned char **p, unsigned char *end);
1708 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1709 lws_add_http_header_content_length(struct lws *wsi,
1710 unsigned long content_length,
1711 unsigned char **p, unsigned char *end);
1712 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1713 lws_add_http_header_status(struct lws *wsi,
1714 unsigned int code, unsigned char **p,
1715 unsigned char *end);
1717 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1718 lws_http_redirect(struct lws *wsi, int code, const unsigned char *loc, int len,
1719 unsigned char **p, unsigned char *end);
1721 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1722 lws_http_transaction_completed(struct lws *wsi);
1724 #ifdef LWS_USE_LIBEV
1725 typedef void (lws_ev_signal_cb_t)(EV_P_ struct ev_signal *w, int revents);
1727 LWS_VISIBLE LWS_EXTERN int
1728 lws_ev_sigint_cfg(struct lws_context *context, int use_ev_sigint,
1729 lws_ev_signal_cb_t *cb);
1731 LWS_VISIBLE LWS_EXTERN int
1732 lws_ev_initloop(struct lws_context *context, struct ev_loop *loop, int tsi);
1734 LWS_VISIBLE LWS_EXTERN void
1735 lws_ev_sigint_cb(struct ev_loop *loop, struct ev_signal *watcher, int revents);
1736 #endif /* LWS_USE_LIBEV */
1738 #ifdef LWS_USE_LIBUV
1739 LWS_VISIBLE LWS_EXTERN int
1740 lws_uv_sigint_cfg(struct lws_context *context, int use_uv_sigint,
1743 LWS_VISIBLE LWS_EXTERN void
1744 lws_libuv_run(const struct lws_context *context, int tsi);
1746 LWS_VISIBLE LWS_EXTERN void
1747 lws_libuv_stop(struct lws_context *context);
1749 LWS_VISIBLE LWS_EXTERN int
1750 lws_uv_initloop(struct lws_context *context, uv_loop_t *loop, int tsi);
1752 LWS_VISIBLE LWS_EXTERN uv_loop_t *
1753 lws_uv_getloop(struct lws_context *context, int tsi);
1755 LWS_VISIBLE LWS_EXTERN void
1756 lws_uv_sigint_cb(uv_signal_t *watcher, int signum);
1757 #endif /* LWS_USE_LIBUV */
1759 LWS_VISIBLE LWS_EXTERN int
1760 lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd);
1762 LWS_VISIBLE LWS_EXTERN int
1763 lws_service_fd_tsi(struct lws_context *context, struct lws_pollfd *pollfd,
1766 LWS_VISIBLE LWS_EXTERN void *
1767 lws_context_user(struct lws_context *context);
1769 LWS_VISIBLE LWS_EXTERN void *
1770 lws_wsi_user(struct lws *wsi);
1773 * NOTE: These public enums are part of the abi. If you want to add one,
1774 * add it at where specified so existing users are unaffected.
1776 enum pending_timeout {
1777 NO_PENDING_TIMEOUT = 0,
1778 PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE = 1,
1779 PENDING_TIMEOUT_AWAITING_CONNECT_RESPONSE = 2,
1780 PENDING_TIMEOUT_ESTABLISH_WITH_SERVER = 3,
1781 PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE = 4,
1782 PENDING_TIMEOUT_AWAITING_PING = 5,
1783 PENDING_TIMEOUT_CLOSE_ACK = 6,
1784 PENDING_TIMEOUT_AWAITING_EXTENSION_CONNECT_RESPONSE = 7,
1785 PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE = 8,
1786 PENDING_TIMEOUT_SSL_ACCEPT = 9,
1787 PENDING_TIMEOUT_HTTP_CONTENT = 10,
1788 PENDING_TIMEOUT_AWAITING_CLIENT_HS_SEND = 11,
1789 PENDING_FLUSH_STORED_SEND_BEFORE_CLOSE = 12,
1790 PENDING_TIMEOUT_SHUTDOWN_FLUSH = 13,
1791 PENDING_TIMEOUT_CGI = 14,
1792 PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE = 15,
1794 /****** add new things just above ---^ ******/
1797 LWS_VISIBLE LWS_EXTERN void
1798 lws_set_timeout(struct lws *wsi, enum pending_timeout reason, int secs);
1803 * When sending with websocket protocol
1807 * LWS_WRITE_CONTINUATION,
1811 * the send buffer has to have LWS_PRE bytes valid BEFORE
1812 * the buffer pointer you pass to lws_write().
1814 * This allows us to add protocol info before and after the data, and send as
1815 * one packet on the network without payload copying, for maximum efficiency.
1817 * So for example you need this kind of code to use lws_write with a
1820 * char buf[LWS_PRE + 128];
1822 * // fill your part of the buffer... for example here it's all zeros
1823 * memset(&buf[LWS_PRE], 0, 128);
1825 * lws_write(wsi, &buf[LWS_PRE], 128, LWS_WRITE_TEXT);
1827 * When sending HTTP, with
1830 * LWS_WRITE_HTTP_HEADERS
1831 * LWS_WRITE_HTTP_FINAL
1833 * there is no protocol data prepended, and don't need to take care about the
1834 * LWS_PRE bytes valid before the buffer pointer.
1836 * LWS_PRE is at least the frame nonce + 2 header + 8 length
1837 * LWS_SEND_BUFFER_POST_PADDING is deprecated, it's now 0 and can be left off.
1838 * The example apps no longer use it.
1840 * Pad LWS_PRE to the CPU word size, so that word references
1841 * to the address immediately after the padding won't cause an unaligned access
1842 * error. Sometimes for performance reasons the recommended padding is even
1843 * larger than sizeof(void *).
1846 #if !defined(LWS_SIZEOFPTR)
1847 #define LWS_SIZEOFPTR (sizeof (void *))
1849 #if !defined(u_int64_t)
1850 #define u_int64_t unsigned long long
1854 #define _LWS_PAD_SIZE 16 /* Intel recommended for best performance */
1856 #define _LWS_PAD_SIZE LWS_SIZEOFPTR /* Size of a pointer on the target arch */
1858 #define _LWS_PAD(n) (((n) % _LWS_PAD_SIZE) ? \
1859 ((n) + (_LWS_PAD_SIZE - ((n) % _LWS_PAD_SIZE))) : (n))
1860 #define LWS_PRE _LWS_PAD(4 + 10)
1861 /* used prior to 1.7 and retained for backward compatibility */
1862 #define LWS_SEND_BUFFER_PRE_PADDING LWS_PRE
1863 #define LWS_SEND_BUFFER_POST_PADDING 0
1865 LWS_VISIBLE LWS_EXTERN int
1866 lws_write(struct lws *wsi, unsigned char *buf, size_t len,
1867 enum lws_write_protocol protocol);
1870 * lws_close_reason - Set reason and aux data to send with Close packet
1871 * If you are going to return nonzero from the callback
1872 * requesting the connection to close, you can optionally
1873 * call this to set the reason the peer will be told if
1876 * @wsi: The websocket connection to set the close reason on
1877 * @status: A valid close status from websocket standard
1878 * @buf: NULL or buffer containing up to 124 bytes of auxiliary data
1879 * @len: Length of data in @buf to send
1881 LWS_VISIBLE LWS_EXTERN void
1882 lws_close_reason(struct lws *wsi, enum lws_close_status status,
1883 unsigned char *buf, size_t len);
1885 /* helper for case where buffer may be const */
1886 #define lws_write_http(wsi, buf, len) \
1887 lws_write(wsi, (unsigned char *)(buf), len, LWS_WRITE_HTTP)
1889 LWS_VISIBLE LWS_EXTERN int
1890 lws_serve_http_file(struct lws *wsi, const char *file, const char *content_type,
1891 const char *other_headers, int other_headers_len);
1892 LWS_VISIBLE LWS_EXTERN int
1893 lws_serve_http_file_fragment(struct lws *wsi);
1895 LWS_VISIBLE LWS_EXTERN int
1896 lws_return_http_status(struct lws *wsi, unsigned int code,
1897 const char *html_body);
1899 LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
1900 lws_get_protocol(struct lws *wsi);
1902 LWS_VISIBLE LWS_EXTERN int
1903 lws_callback_on_writable(struct lws *wsi);
1905 LWS_VISIBLE LWS_EXTERN int
1906 lws_callback_on_writable_all_protocol(const struct lws_context *context,
1907 const struct lws_protocols *protocol);
1909 LWS_VISIBLE LWS_EXTERN int
1910 lws_callback_on_writable_all_protocol_vhost(const struct lws_vhost *vhost,
1911 const struct lws_protocols *protocol);
1913 LWS_VISIBLE LWS_EXTERN int
1914 lws_callback_all_protocol(struct lws_context *context,
1915 const struct lws_protocols *protocol, int reason);
1917 LWS_VISIBLE LWS_EXTERN int
1918 lws_callback_all_protocol_vhost(struct lws_vhost *vh,
1919 const struct lws_protocols *protocol, int reason);
1921 LWS_VISIBLE LWS_EXTERN int
1922 lws_get_socket_fd(struct lws *wsi);
1924 LWS_VISIBLE LWS_EXTERN int
1925 lws_is_final_fragment(struct lws *wsi);
1927 LWS_VISIBLE LWS_EXTERN unsigned char
1928 lws_get_reserved_bits(struct lws *wsi);
1930 LWS_VISIBLE LWS_EXTERN int
1931 lws_rx_flow_control(struct lws *wsi, int enable);
1933 LWS_VISIBLE LWS_EXTERN void
1934 lws_rx_flow_allow_all_protocol(const struct lws_context *context,
1935 const struct lws_protocols *protocol);
1937 LWS_VISIBLE LWS_EXTERN size_t
1938 lws_remaining_packet_payload(struct lws *wsi);
1941 * if the protocol does not have any guidance, returns -1. Currently only
1942 * http2 connections get send window information from this API. But your code
1943 * should use it so it can work properly with any protocol.
1945 * If nonzero return is the amount of payload data the peer or intermediary has
1946 * reported it has buffer space for. That has NO relationship with the amount
1947 * of buffer space your OS can accept on this connection for a write action.
1949 * This number represents the maximum you could send to the peer or intermediary
1950 * on this connection right now without it complaining.
1952 * lws manages accounting for send window updates and payload writes
1953 * automatically, so this number reflects the situation at the peer or
1954 * intermediary dynamically.
1956 LWS_VISIBLE LWS_EXTERN size_t
1957 lws_get_peer_write_allowance(struct lws *wsi);
1959 /* deprecated, use lws_client_connect_via_info() */
1960 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1961 lws_client_connect(struct lws_context *clients, const char *address,
1962 int port, int ssl_connection, const char *path,
1963 const char *host, const char *origin, const char *protocol,
1964 int ietf_version_or_minus_one) LWS_WARN_DEPRECATED;
1965 /* deprecated, use lws_client_connect_via_info() */
1966 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1967 lws_client_connect_extended(struct lws_context *clients, const char *address,
1968 int port, int ssl_connection, const char *path,
1969 const char *host, const char *origin,
1970 const char *protocol, int ietf_version_or_minus_one,
1971 void *userdata) LWS_WARN_DEPRECATED;
1973 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
1974 lws_client_connect_via_info(struct lws_client_connect_info * ccinfo);
1976 LWS_VISIBLE LWS_EXTERN struct lws *
1977 lws_adopt_socket(struct lws_context *context, lws_sockfd_type accept_fd);
1978 LWS_VISIBLE LWS_EXTERN struct lws *
1979 lws_adopt_socket_readbuf(struct lws_context *context, lws_sockfd_type accept_fd,
1980 const char *readbuf, size_t len);
1982 LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
1983 lws_canonical_hostname(struct lws_context *context);
1986 LWS_VISIBLE LWS_EXTERN void
1987 lws_get_peer_addresses(struct lws *wsi, lws_sockfd_type fd, char *name,
1988 int name_len, char *rip, int rip_len);
1990 LWS_VISIBLE LWS_EXTERN const char *
1991 lws_get_peer_simple(struct lws *wsi, char *name, int namelen);
1993 LWS_VISIBLE LWS_EXTERN int
1994 lws_get_random(struct lws_context *context, void *buf, int len);
1996 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
1997 lws_daemonize(const char *_lock_path);
1999 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
2000 lws_send_pipe_choked(struct lws *wsi);
2002 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
2003 lws_partial_buffered(struct lws *wsi);
2005 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
2006 lws_frame_is_binary(struct lws *wsi);
2008 LWS_VISIBLE LWS_EXTERN int
2009 lws_is_ssl(struct lws *wsi);
2011 LWS_VISIBLE LWS_EXTERN int
2012 lws_is_cgi(struct lws *wsi);
2014 #ifdef LWS_SHA1_USE_OPENSSL_NAME
2015 #define lws_SHA1 SHA1
2017 LWS_VISIBLE LWS_EXTERN unsigned char *
2018 lws_SHA1(const unsigned char *d, size_t n, unsigned char *md);
2021 LWS_VISIBLE LWS_EXTERN int
2022 lws_b64_encode_string(const char *in, int in_len, char *out, int out_size);
2024 LWS_VISIBLE LWS_EXTERN int
2025 lws_b64_decode_string(const char *in, char *out, int out_size);
2027 LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
2028 lws_get_library_version(void);
2030 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
2031 lws_parse_uri(char *p, const char **prot, const char **ads, int *port,
2035 * Access to http headers
2037 * In lws the client http headers are temporarily malloc'd only for the
2038 * duration of the http part of the handshake. It's because in most cases,
2039 * the header content is ignored for the whole rest of the connection lifetime
2040 * and would then just be taking up space needlessly.
2042 * During LWS_CALLBACK_HTTP when the URI path is delivered is the last time
2043 * the http headers are still allocated, you can use these apis then to
2044 * look at and copy out interesting header content (cookies, etc)
2046 * Notice that the header total length reported does not include a terminating
2047 * '\0', however you must allocate for it when using the _copy apis. So the
2048 * length reported for a header containing "123" is 3, but you must provide
2049 * a buffer of length 4 so that "123\0" may be copied into it, or the copy
2050 * will fail with a nonzero return code.
2053 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
2054 lws_hdr_total_length(struct lws *wsi, enum lws_token_indexes h);
2056 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
2057 lws_hdr_fragment_length(struct lws *wsi, enum lws_token_indexes h, int frag_idx);
2060 * copies the whole, aggregated header, even if it was delivered in
2061 * several actual headers piece by piece
2063 LWS_VISIBLE LWS_EXTERN int
2064 lws_hdr_copy(struct lws *wsi, char *dest, int len, enum lws_token_indexes h);
2067 * copies only fragment frag_idx of a header. Normally this is only useful
2068 * to parse URI arguments like ?x=1&y=2, token index WSI_TOKEN_HTTP_URI_ARGS
2069 * fragment 0 will contain "x=1" and fragment 1 "y=2"
2071 LWS_VISIBLE LWS_EXTERN int
2072 lws_hdr_copy_fragment(struct lws *wsi, char *dest, int len,
2073 enum lws_token_indexes h, int frag_idx);
2076 /* get the active file operations struct */
2077 LWS_VISIBLE LWS_EXTERN struct lws_plat_file_ops * LWS_WARN_UNUSED_RESULT
2078 lws_get_fops(struct lws_context *context);
2080 LWS_VISIBLE LWS_EXTERN struct lws_context * LWS_WARN_UNUSED_RESULT
2081 lws_get_context(const struct lws *wsi);
2083 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
2084 lws_get_count_threads(struct lws_context *context);
2086 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
2087 lws_get_parent(const struct lws *wsi);
2089 LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
2090 lws_get_child(const struct lws *wsi);
2093 enum lws_enum_stdinouterr {
2099 enum lws_cgi_hdr_state {
2109 struct lws_cgi_args {
2110 struct lws **stdwsi; /* get fd with lws_get_socket_fd() */
2111 enum lws_enum_stdinouterr ch;
2112 unsigned char *data; /* for messages with payload */
2113 enum lws_cgi_hdr_state hdr_state;
2117 LWS_VISIBLE LWS_EXTERN int
2118 lws_cgi(struct lws *wsi, const char * const *exec_array,
2119 int script_uri_path_len, int timeout_secs,
2120 const struct lws_protocol_vhost_options *mp_cgienv);
2122 LWS_VISIBLE LWS_EXTERN int
2123 lws_cgi_write_split_stdout_headers(struct lws *wsi);
2125 LWS_VISIBLE LWS_EXTERN int
2126 lws_cgi_kill(struct lws *wsi);
2129 LWS_VISIBLE LWS_EXTERN int
2130 lws_http_client_read(struct lws *wsi, char **buf, int *len);
2135 LWS_VISIBLE LWS_EXTERN int
2136 lwsws_get_config_globals(struct lws_context_creation_info *info, const char *d,
2137 char **config_strings, int *len);
2139 LWS_VISIBLE LWS_EXTERN int
2140 lwsws_get_config_vhosts(struct lws_context *context,
2141 struct lws_context_creation_info *info, const char *d,
2142 char **config_strings, int *len);
2145 * Wsi-associated File Operations access helpers
2147 * Use these helper functions if you want to access a file from the perspective
2148 * of a specific wsi, which is usually the case. If you just want contextless
2149 * file access, use the fops callbacks directly with NULL wsi instead of these
2152 * If so, then it calls the platform handler or user overrides where present
2153 * (as defined in info->fops)
2155 * The advantage from all this is user code can be portable for file operations
2156 * without having to deal with differences between platforms.
2159 static LWS_INLINE lws_filefd_type LWS_WARN_UNUSED_RESULT
2160 lws_plat_file_open(struct lws *wsi, const char *filename,
2161 unsigned long *filelen, int flags)
2163 return lws_get_fops(lws_get_context(wsi))->open(wsi, filename,
2167 static LWS_INLINE int
2168 lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
2170 return lws_get_fops(lws_get_context(wsi))->close(wsi, fd);
2173 static LWS_INLINE unsigned long
2174 lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
2176 return lws_get_fops(lws_get_context(wsi))->seek_cur(wsi, fd, offset);
2179 static LWS_INLINE int LWS_WARN_UNUSED_RESULT
2180 lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
2181 unsigned char *buf, unsigned long len)
2183 return lws_get_fops(lws_get_context(wsi))->read(wsi, fd, amount, buf,
2187 static LWS_INLINE int LWS_WARN_UNUSED_RESULT
2188 lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
2189 unsigned char *buf, unsigned long len)
2191 return lws_get_fops(lws_get_context(wsi))->write(wsi, fd, amount, buf,
2196 * Note: this is not normally needed as a user api. It's provided in case it is
2197 * useful when integrating with other app poll loop service code.
2199 LWS_VISIBLE LWS_EXTERN int
2200 lws_read(struct lws *wsi, unsigned char *buf, size_t len);
2202 #ifndef LWS_NO_EXTENSIONS
2205 * There is no longer a set internal extensions table. The table is provided
2206 * by user code along with application-specific settings. See the test
2207 * client and server for how to do.
2209 static LWS_INLINE LWS_WARN_DEPRECATED const struct lws_extension *
2210 lws_get_internal_extensions() { return NULL; }
2211 LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
2212 lws_ext_parse_options(const struct lws_extension *ext, struct lws *wsi,
2213 void *ext_user, const struct lws_ext_options *opts,
2214 const char *o, int len);
2218 * custom allocator support
2220 LWS_VISIBLE LWS_EXTERN void
2221 lws_set_allocator(void *(*realloc)(void *ptr, size_t size));