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 1024
122 #ifndef LWS_MAX_PROTOCOLS
123 #define LWS_MAX_PROTOCOLS 5
125 #ifndef LWS_MAX_EXTENSIONS_ACTIVE
126 #define LWS_MAX_EXTENSIONS_ACTIVE 3
128 #ifndef SPEC_LATEST_SUPPORTED
129 #define SPEC_LATEST_SUPPORTED 13
131 #ifndef AWAITING_TIMEOUT
132 #define AWAITING_TIMEOUT 5
134 #ifndef CIPHERS_LIST_STRING
135 #define CIPHERS_LIST_STRING "DEFAULT"
137 #ifndef LWS_SOMAXCONN
138 #define LWS_SOMAXCONN SOMAXCONN
141 #define MAX_WEBSOCKET_04_KEY_LEN 128
142 #define LWS_MAX_SOCKET_IO_BUF 4096
144 #ifndef SYSTEM_RANDOM_FILEPATH
145 #define SYSTEM_RANDOM_FILEPATH "/dev/urandom"
147 #ifndef LWS_MAX_ZLIB_CONN_BUFFER
148 #define LWS_MAX_ZLIB_CONN_BUFFER (64 * 1024)
152 * if not in a connection storm, check for incoming
153 * connections this many normal connection services
155 #define LWS_LISTEN_SERVICE_MODULO 10
157 enum lws_websocket_opcodes_07 {
158 LWS_WS_OPCODE_07__CONTINUATION = 0,
159 LWS_WS_OPCODE_07__TEXT_FRAME = 1,
160 LWS_WS_OPCODE_07__BINARY_FRAME = 2,
162 LWS_WS_OPCODE_07__NOSPEC__MUX = 7,
164 /* control extensions 8+ */
166 LWS_WS_OPCODE_07__CLOSE = 8,
167 LWS_WS_OPCODE_07__PING = 9,
168 LWS_WS_OPCODE_07__PONG = 0xa,
172 enum lws_connection_states {
174 WSI_STATE_HTTP_ISSUING_FILE,
175 WSI_STATE_HTTP_HEADERS,
176 WSI_STATE_DEAD_SOCKET,
177 WSI_STATE_ESTABLISHED,
178 WSI_STATE_CLIENT_UNCONNECTED,
179 WSI_STATE_RETURNED_CLOSE_ALREADY,
180 WSI_STATE_AWAITING_CLOSE_ACK,
183 enum lws_rx_parse_state {
186 LWS_RXPS_04_MASK_NONCE_1,
187 LWS_RXPS_04_MASK_NONCE_2,
188 LWS_RXPS_04_MASK_NONCE_3,
190 LWS_RXPS_04_FRAME_HDR_1,
191 LWS_RXPS_04_FRAME_HDR_LEN,
192 LWS_RXPS_04_FRAME_HDR_LEN16_2,
193 LWS_RXPS_04_FRAME_HDR_LEN16_1,
194 LWS_RXPS_04_FRAME_HDR_LEN64_8,
195 LWS_RXPS_04_FRAME_HDR_LEN64_7,
196 LWS_RXPS_04_FRAME_HDR_LEN64_6,
197 LWS_RXPS_04_FRAME_HDR_LEN64_5,
198 LWS_RXPS_04_FRAME_HDR_LEN64_4,
199 LWS_RXPS_04_FRAME_HDR_LEN64_3,
200 LWS_RXPS_04_FRAME_HDR_LEN64_2,
201 LWS_RXPS_04_FRAME_HDR_LEN64_1,
203 LWS_RXPS_07_COLLECT_FRAME_KEY_1,
204 LWS_RXPS_07_COLLECT_FRAME_KEY_2,
205 LWS_RXPS_07_COLLECT_FRAME_KEY_3,
206 LWS_RXPS_07_COLLECT_FRAME_KEY_4,
208 LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED
212 enum connection_mode {
213 LWS_CONNMODE_HTTP_SERVING,
215 LWS_CONNMODE_WS_SERVING,
216 LWS_CONNMODE_WS_CLIENT,
218 /* transient, ssl delay hiding */
219 LWS_CONNMODE_SSL_ACK_PENDING,
221 /* transient modes */
222 LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY,
223 LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE,
224 LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY,
225 LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT,
226 LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD,
228 /* special internal types */
229 LWS_CONNMODE_SERVER_LISTENER,
232 struct libwebsocket_protocols;
235 struct libwebsocket_context {
237 struct libwebsocket **lws_lookup; /* fd to wsi */
241 char http_proxy_address[256];
242 char canonical_hostname[1024];
243 unsigned int http_proxy_port;
244 unsigned int options;
245 unsigned long last_timeout_check_s;
248 * usable by anything in the service code, but only if the scope
249 * does not last longer than the service action (since next service
250 * of any socket can likewise use it and overwrite)
252 unsigned char service_buffer[LWS_MAX_SOCKET_IO_BUF];
254 int started_with_parent;
257 int listen_service_modulo;
258 int listen_service_count;
259 int listen_service_fd;
260 int listen_service_extraseen;
267 unsigned long worst_latency;
268 char worst_latency_info[256];
271 #ifdef LWS_OPENSSL_SUPPORT
274 SSL_CTX *ssl_client_ctx;
276 struct libwebsocket_protocols *protocols;
278 #ifndef LWS_NO_EXTENSIONS
279 struct libwebsocket_extension *extensions;
285 enum pending_timeout {
286 NO_PENDING_TIMEOUT = 0,
287 PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE,
288 PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
289 PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE,
290 PENDING_TIMEOUT_AWAITING_PING,
291 PENDING_TIMEOUT_CLOSE_ACK,
292 PENDING_TIMEOUT_AWAITING_EXTENSION_CONNECT_RESPONSE,
293 PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE,
294 PENDING_TIMEOUT_SSL_ACCEPT,
299 * This is totally opaque to code using the library. It's exported as a
300 * forward-reference pointer-only declaration; the user can use the pointer with
301 * other APIs to get information out of it.
304 struct _lws_http_mode_related {
306 unsigned long filepos;
307 unsigned long filelen;
310 struct lws_fragments {
311 unsigned short offset;
313 unsigned char next_frag_index;
316 struct allocated_headers {
317 unsigned short next_frag_index;
319 unsigned char frag_index[WSI_TOKEN_COUNT];
320 struct lws_fragments frags[WSI_TOKEN_COUNT * 2];
321 char data[LWS_MAX_HEADER_LEN];
324 struct _lws_header_related {
325 char name_buffer[LWS_MAX_HEADER_NAME_LENGTH];
326 unsigned char name_buffer_pos;
327 struct allocated_headers *ah;
329 unsigned char parser_state; /* enum lws_token_indexes */
330 int current_alloc_len;
331 #ifndef LWS_NO_CLIENT
332 char initial_handshake_hash_base64[30];
336 struct _lws_websocket_related {
337 char *rx_user_buffer;
338 int rx_user_buffer_head;
339 unsigned char frame_masking_nonce_04[4];
340 unsigned char frame_mask_index;
341 size_t rx_packet_length;
342 unsigned char opcode;
343 unsigned int final:1;
345 unsigned int frame_is_binary:1;
346 unsigned int all_zero_nonce:1;
347 enum lws_close_status close_reason;
348 unsigned char *rxflow_buffer;
351 int rxflow_change_to;
352 unsigned int this_frame_masked:1;
355 struct libwebsocket {
357 /* lifetime members */
359 const struct libwebsocket_protocols *protocol;
360 #ifndef LWS_NO_EXTENSIONS
361 struct libwebsocket_extension *
362 active_extensions[LWS_MAX_EXTENSIONS_ACTIVE];
363 void *active_extensions_user[LWS_MAX_EXTENSIONS_ACTIVE];
364 unsigned char count_active_extensions;
365 unsigned int extension_data_pending:1;
367 unsigned char ietf_spec_revision;
369 char mode; /* enum connection_mode */
370 char state; /* enum lws_connection_states */
371 char lws_rx_parse_state; /* enum lws_rx_parse_state */
372 char rx_frame_type; /* enum libwebsocket_write_protocol */
374 char pending_timeout; /* enum pending_timeout */
375 unsigned long pending_timeout_limit;
378 int position_in_fds_table;
380 unsigned long action_start;
381 unsigned long latency_start;
386 /* members with mutually exclusive lifetimes are unionized */
389 struct _lws_http_mode_related http;
390 struct _lws_header_related hdr;
391 struct _lws_websocket_related ws;
394 #ifndef LWS_NO_CLIENT
399 callback_function *c_callback;
402 unsigned short c_port;
405 #ifdef LWS_OPENSSL_SUPPORT
408 unsigned int use_ssl:2;
413 static inline void lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi, const char *action, int ret, int completion) { while (0); }
414 static inline void lws_latency_pre(struct libwebsocket_context *context, struct libwebsocket *wsi) { while (0); }
416 #define lws_latency_pre(_context, _wsi) lws_latency(_context, _wsi, NULL, 0, 0)
418 lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi, const char *action, int ret, int completion);
422 libwebsocket_client_rx_sm(struct libwebsocket *wsi, unsigned char c);
425 libwebsocket_parse(struct libwebsocket *wsi, unsigned char c);
428 libwebsocket_interpret_incoming_packet(struct libwebsocket *wsi,
429 unsigned char *buf, size_t len);
432 lws_b64_selftest(void);
434 extern struct libwebsocket *
435 wsi_from_fd(struct libwebsocket_context *context, int fd);
438 insert_wsi_socket_into_fds(struct libwebsocket_context *context, struct libwebsocket *wsi);
441 libwebsocket_set_timeout(struct libwebsocket *wsi,
442 enum pending_timeout reason, int secs);
445 lws_issue_raw(struct libwebsocket *wsi, unsigned char *buf, size_t len);
449 libwebsocket_service_timeout_check(struct libwebsocket_context *context,
450 struct libwebsocket *wsi, unsigned int sec);
452 extern struct libwebsocket *
453 __libwebsocket_client_connect_2(struct libwebsocket_context *context,
454 struct libwebsocket *wsi);
456 extern struct libwebsocket *
457 libwebsocket_create_new_server_wsi(struct libwebsocket_context *context);
460 libwebsockets_generate_client_handshake(struct libwebsocket_context *context,
461 struct libwebsocket *wsi, char *pkt);
464 lws_handle_POLLOUT_event(struct libwebsocket_context *context,
465 struct libwebsocket *wsi, struct pollfd *pollfd);
466 #ifndef LWS_NO_EXTENSIONS
468 lws_any_extension_handled(struct libwebsocket_context *context,
469 struct libwebsocket *wsi,
470 enum libwebsocket_extension_callback_reasons r,
471 void *v, size_t len);
474 lws_get_extension_user_matching_ext(struct libwebsocket *wsi,
475 struct libwebsocket_extension *ext);
479 lws_client_interpret_server_handshake(struct libwebsocket_context *context,
480 struct libwebsocket *wsi);
483 libwebsocket_rx_sm(struct libwebsocket *wsi, unsigned char c);
486 lws_issue_raw_ext_access(struct libwebsocket *wsi,
487 unsigned char *buf, size_t len);
490 _libwebsocket_rx_flow_control(struct libwebsocket *wsi);
493 user_callback_handle_rxflow(callback_function, struct libwebsocket_context * context,
494 struct libwebsocket *wsi,
495 enum libwebsocket_callback_reasons reason, void *user,
496 void *in, size_t len);
499 lws_set_socket_options(struct libwebsocket_context *context, int fd);
502 lws_allocate_header_table(struct libwebsocket *wsi);
505 lws_hdr_simple_ptr(struct libwebsocket *wsi, enum lws_token_indexes h);
507 #ifndef LWS_OPENSSL_SUPPORT
510 SHA1(const unsigned char *d, size_t n, unsigned char *md);