2 * libwebsockets - small server side websockets and web server implementation
4 * Copyright (C) 2010 - 2013 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 // System introspection configs.
24 #include "lws_config.h"
27 #define inline __inline
33 #if _MSC_VER > 1000 || defined(_WIN32)
49 #elif _MSC_VER > 1000 || defined(_WIN32)
59 #define LWS_NO_DAEMONIZE
61 #define compatible_close(fd) closesocket(fd);
73 #include <sys/types.h>
74 #include <sys/socket.h>
76 #ifdef HAVE_SYS_PRCTL_H
77 #include <sys/prctl.h>
80 #include <netinet/in.h>
81 #include <netinet/tcp.h>
82 #include <arpa/inet.h>
88 #define compatible_close(fd) close(fd);
91 #ifdef LWS_OPENSSL_SUPPORT
93 #include <cyassl/openssl/ssl.h>
94 #include <cyassl/error.h>
96 SHA1(const unsigned char *d, size_t n, unsigned char *md);
98 #include <openssl/ssl.h>
99 #include <openssl/evp.h>
100 #include <openssl/err.h>
101 #include <openssl/md5.h>
102 #include <openssl/sha.h>
103 #endif /* not USE_CYASSL */
106 #include "libwebsockets.h"
109 * Mac OSX as well as iOS do not define the MSG_NOSIGNAL flag,
110 * but happily have something equivalent in the SO_NOSIGPIPE flag.
113 #define MSG_NOSIGNAL SO_NOSIGPIPE
116 #ifndef LWS_MAX_HEADER_NAME_LENGTH
117 #define LWS_MAX_HEADER_NAME_LENGTH 64
119 #ifndef LWS_MAX_HEADER_LEN
120 #define LWS_MAX_HEADER_LEN 4096
122 #ifndef LWS_INITIAL_HDR_ALLOC
123 #define LWS_INITIAL_HDR_ALLOC 256
125 #ifndef LWS_ADDITIONAL_HDR_ALLOC
126 #define LWS_ADDITIONAL_HDR_ALLOC 64
128 #ifndef LWS_MAX_PROTOCOLS
129 #define LWS_MAX_PROTOCOLS 5
131 #ifndef LWS_MAX_EXTENSIONS_ACTIVE
132 #define LWS_MAX_EXTENSIONS_ACTIVE 3
134 #ifndef SPEC_LATEST_SUPPORTED
135 #define SPEC_LATEST_SUPPORTED 13
137 #ifndef AWAITING_TIMEOUT
138 #define AWAITING_TIMEOUT 5
140 #ifndef CIPHERS_LIST_STRING
141 #define CIPHERS_LIST_STRING "DEFAULT"
143 #ifndef LWS_SOMAXCONN
144 #define LWS_SOMAXCONN SOMAXCONN
147 #define MAX_WEBSOCKET_04_KEY_LEN 128
148 #define LWS_MAX_SOCKET_IO_BUF 4096
150 #ifndef SYSTEM_RANDOM_FILEPATH
151 #define SYSTEM_RANDOM_FILEPATH "/dev/urandom"
153 #ifndef LWS_MAX_ZLIB_CONN_BUFFER
154 #define LWS_MAX_ZLIB_CONN_BUFFER (64 * 1024)
158 * if not in a connection storm, check for incoming
159 * connections this many normal connection services
161 #define LWS_LISTEN_SERVICE_MODULO 10
163 enum lws_websocket_opcodes_07 {
164 LWS_WS_OPCODE_07__CONTINUATION = 0,
165 LWS_WS_OPCODE_07__TEXT_FRAME = 1,
166 LWS_WS_OPCODE_07__BINARY_FRAME = 2,
168 LWS_WS_OPCODE_07__NOSPEC__MUX = 7,
170 /* control extensions 8+ */
172 LWS_WS_OPCODE_07__CLOSE = 8,
173 LWS_WS_OPCODE_07__PING = 9,
174 LWS_WS_OPCODE_07__PONG = 0xa,
178 enum lws_connection_states {
180 WSI_STATE_HTTP_ISSUING_FILE,
181 WSI_STATE_HTTP_HEADERS,
182 WSI_STATE_DEAD_SOCKET,
183 WSI_STATE_ESTABLISHED,
184 WSI_STATE_CLIENT_UNCONNECTED,
185 WSI_STATE_RETURNED_CLOSE_ALREADY,
186 WSI_STATE_AWAITING_CLOSE_ACK,
189 enum lws_rx_parse_state {
192 LWS_RXPS_04_MASK_NONCE_1,
193 LWS_RXPS_04_MASK_NONCE_2,
194 LWS_RXPS_04_MASK_NONCE_3,
196 LWS_RXPS_04_FRAME_HDR_1,
197 LWS_RXPS_04_FRAME_HDR_LEN,
198 LWS_RXPS_04_FRAME_HDR_LEN16_2,
199 LWS_RXPS_04_FRAME_HDR_LEN16_1,
200 LWS_RXPS_04_FRAME_HDR_LEN64_8,
201 LWS_RXPS_04_FRAME_HDR_LEN64_7,
202 LWS_RXPS_04_FRAME_HDR_LEN64_6,
203 LWS_RXPS_04_FRAME_HDR_LEN64_5,
204 LWS_RXPS_04_FRAME_HDR_LEN64_4,
205 LWS_RXPS_04_FRAME_HDR_LEN64_3,
206 LWS_RXPS_04_FRAME_HDR_LEN64_2,
207 LWS_RXPS_04_FRAME_HDR_LEN64_1,
209 LWS_RXPS_07_COLLECT_FRAME_KEY_1,
210 LWS_RXPS_07_COLLECT_FRAME_KEY_2,
211 LWS_RXPS_07_COLLECT_FRAME_KEY_3,
212 LWS_RXPS_07_COLLECT_FRAME_KEY_4,
214 LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED
218 enum connection_mode {
219 LWS_CONNMODE_HTTP_SERVING,
221 LWS_CONNMODE_WS_SERVING,
222 LWS_CONNMODE_WS_CLIENT,
224 /* transient, ssl delay hiding */
225 LWS_CONNMODE_SSL_ACK_PENDING,
227 /* transient modes */
228 LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY,
229 LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE,
230 LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY,
231 LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT,
232 LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD,
234 /* special internal types */
235 LWS_CONNMODE_SERVER_LISTENER,
238 struct libwebsocket_protocols;
241 struct libwebsocket_context {
243 struct libwebsocket **lws_lookup; /* fd to wsi */
247 char http_proxy_address[256];
248 char canonical_hostname[1024];
249 unsigned int http_proxy_port;
250 unsigned int options;
251 unsigned long last_timeout_check_s;
254 * usable by anything in the service code, but only if the scope
255 * does not last longer than the service action (since next service
256 * of any socket can likewise use it and overwrite)
258 unsigned char service_buffer[LWS_MAX_SOCKET_IO_BUF];
260 int started_with_parent;
263 int listen_service_modulo;
264 int listen_service_count;
265 int listen_service_fd;
266 int listen_service_extraseen;
273 unsigned long worst_latency;
274 char worst_latency_info[256];
277 #ifdef LWS_OPENSSL_SUPPORT
280 SSL_CTX *ssl_client_ctx;
282 struct libwebsocket_protocols *protocols;
284 #ifndef LWS_NO_EXTENSIONS
285 struct libwebsocket_extension *extensions;
291 enum pending_timeout {
292 NO_PENDING_TIMEOUT = 0,
293 PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE,
294 PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
295 PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE,
296 PENDING_TIMEOUT_AWAITING_PING,
297 PENDING_TIMEOUT_CLOSE_ACK,
298 PENDING_TIMEOUT_AWAITING_EXTENSION_CONNECT_RESPONSE,
299 PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE,
300 PENDING_TIMEOUT_SSL_ACCEPT,
305 * This is totally opaque to code using the library. It's exported as a
306 * forward-reference pointer-only declaration; the user can use the pointer with
307 * other APIs to get information out of it.
310 struct _lws_http_mode_related {
312 unsigned long filepos;
313 unsigned long filelen;
316 struct _lws_header_related {
317 char name_buffer[LWS_MAX_HEADER_NAME_LENGTH];
318 unsigned char name_buffer_pos;
319 struct lws_tokens hdrs[WSI_TOKEN_COUNT];
321 unsigned char parser_state; /* enum lws_token_indexes */
322 int current_alloc_len;
323 #ifndef LWS_NO_CLIENT
324 char initial_handshake_hash_base64[30];
328 struct _lws_websocket_related {
329 char *rx_user_buffer;
330 int rx_user_buffer_head;
331 unsigned char masking_key_04[20];
332 unsigned char frame_masking_nonce_04[4];
333 unsigned char frame_mask_04[20];
334 unsigned char frame_mask_index;
335 size_t rx_packet_length;
336 unsigned char opcode;
337 unsigned int final:1;
339 unsigned int frame_is_binary:1;
341 unsigned int all_zero_nonce:1;
342 enum lws_close_status close_reason;
343 unsigned char *rxflow_buffer;
346 int rxflow_change_to;
347 unsigned int this_frame_masked:1;
350 struct libwebsocket {
352 /* lifetime members */
354 const struct libwebsocket_protocols *protocol;
355 #ifndef LWS_NO_EXTENSIONS
356 struct libwebsocket_extension *
357 active_extensions[LWS_MAX_EXTENSIONS_ACTIVE];
358 void *active_extensions_user[LWS_MAX_EXTENSIONS_ACTIVE];
359 unsigned char count_active_extensions;
360 unsigned int extension_data_pending:1;
361 struct libwebsocket *extension_handles;
362 struct libwebsocket *candidate_children_list;
364 unsigned char ietf_spec_revision;
366 char mode; /* enum connection_mode */
367 char state; /* enum lws_connection_states */
368 char lws_rx_parse_state; /* enum lws_rx_parse_state */
369 char rx_frame_type; /* enum libwebsocket_write_protocol */
371 char pending_timeout; /* enum pending_timeout */
372 unsigned long pending_timeout_limit;
375 int position_in_fds_table;
377 unsigned long action_start;
378 unsigned long latency_start;
383 /* members with mutually exclusive lifetimes are unionized */
386 struct _lws_http_mode_related http;
387 struct _lws_header_related hdr;
388 struct _lws_websocket_related ws;
391 #ifndef LWS_NO_CLIENT
396 callback_function *c_callback;
399 unsigned short c_port;
402 #ifdef LWS_OPENSSL_SUPPORT
405 unsigned int use_ssl:2;
410 static inline void lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi, const char *action, int ret, int completion) { while (0); }
411 static inline void lws_latency_pre(struct libwebsocket_context *context, struct libwebsocket *wsi) { while (0); }
413 #define lws_latency_pre(_context, _wsi) lws_latency(_context, _wsi, NULL, 0, 0)
415 lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi, const char *action, int ret, int completion);
419 libwebsocket_client_rx_sm(struct libwebsocket *wsi, unsigned char c);
422 libwebsocket_parse(struct libwebsocket *wsi, unsigned char c);
425 libwebsocket_interpret_incoming_packet(struct libwebsocket *wsi,
426 unsigned char *buf, size_t len);
429 lws_b64_selftest(void);
431 extern struct libwebsocket *
432 wsi_from_fd(struct libwebsocket_context *context, int fd);
435 insert_wsi_socket_into_fds(struct libwebsocket_context *context, struct libwebsocket *wsi);
438 libwebsocket_set_timeout(struct libwebsocket *wsi,
439 enum pending_timeout reason, int secs);
442 lws_issue_raw(struct libwebsocket *wsi, unsigned char *buf, size_t len);
446 libwebsocket_service_timeout_check(struct libwebsocket_context *context,
447 struct libwebsocket *wsi, unsigned int sec);
449 extern struct libwebsocket *
450 __libwebsocket_client_connect_2(struct libwebsocket_context *context,
451 struct libwebsocket *wsi);
453 extern struct libwebsocket *
454 libwebsocket_create_new_server_wsi(struct libwebsocket_context *context);
457 libwebsockets_generate_client_handshake(struct libwebsocket_context *context,
458 struct libwebsocket *wsi, char *pkt);
461 lws_handle_POLLOUT_event(struct libwebsocket_context *context,
462 struct libwebsocket *wsi, struct pollfd *pollfd);
463 #ifndef LWS_NO_EXTENSIONS
465 lws_any_extension_handled(struct libwebsocket_context *context,
466 struct libwebsocket *wsi,
467 enum libwebsocket_extension_callback_reasons r,
468 void *v, size_t len);
471 lws_get_extension_user_matching_ext(struct libwebsocket *wsi,
472 struct libwebsocket_extension *ext);
476 lws_client_interpret_server_handshake(struct libwebsocket_context *context,
477 struct libwebsocket *wsi);
480 libwebsocket_rx_sm(struct libwebsocket *wsi, unsigned char c);
483 lws_issue_raw_ext_access(struct libwebsocket *wsi,
484 unsigned char *buf, size_t len);
487 _libwebsocket_rx_flow_control(struct libwebsocket *wsi);
490 user_callback_handle_rxflow(callback_function, struct libwebsocket_context * context,
491 struct libwebsocket *wsi,
492 enum libwebsocket_callback_reasons reason, void *user,
493 void *in, size_t len);
496 lws_set_socket_options(struct libwebsocket_context *context, int fd);
498 #ifndef LWS_OPENSSL_SUPPORT
501 SHA1(const unsigned char *d, size_t n, unsigned char *md);