| /* |
| * libwebsockets - small server side websockets and web server implementation |
| * |
| * Copyright (C) 2010 - 2013 Andy Green <andy@warmcat.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation: |
| * version 2.1 of the License. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| * MA 02110-1301 USA |
| */ |
| #ifdef CMAKE_BUILD |
| #include "lws_config.h" |
| #endif |
| |
| #if _MSC_VER > 1000 || defined(_WIN32) |
| #else |
| #include <unistd.h> |
| #include <strings.h> |
| #endif |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <limits.h> |
| #ifdef __MINGW64__ |
| #else |
| #ifdef __MINGW32__ |
| #elif _MSC_VER > 1000 || defined(_WIN32) |
| #else |
| #include <netdb.h> |
| #endif |
| #endif |
| #include <stdarg.h> |
| |
| #include <sys/stat.h> |
| |
| #ifndef inline |
| #ifdef __inline |
| #define inline __inline |
| #elif defined(__inline__) |
| #define inline __inline__ |
| #endif |
| #endif |
| |
| #ifdef WIN32 |
| #define LWS_NO_DAEMONIZE |
| |
| #ifndef PATH_MAX |
| #define PATH_MAX MAX_PATH |
| #endif |
| |
| #define compatible_close(fd) closesocket(fd); |
| #ifdef __MINGW64__ |
| #else |
| #ifdef __MINGW32__ |
| #else |
| #include <time.h > |
| #endif |
| #endif |
| #include <winsock2.h> |
| #include <ws2ipdef.h> |
| #include <windows.h> |
| #else |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #ifndef LWS_NO_FORK |
| #ifdef HAVE_SYS_PRCTL_H |
| #include <sys/prctl.h> |
| #endif |
| #endif |
| #include <netinet/in.h> |
| #include <netinet/tcp.h> |
| #include <arpa/inet.h> |
| |
| #include <poll.h> |
| #include <sys/mman.h> |
| #include <sys/time.h> |
| |
| #define compatible_close(fd) close(fd); |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| #include <openssl/ssl.h> |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #include <openssl/md5.h> |
| #include <openssl/sha.h> |
| #endif |
| |
| #include "libwebsockets.h" |
| |
| /* |
| * Mac OSX as well as iOS do not define the MSG_NOSIGNAL flag, |
| * but happily have something equivalent in the SO_NOSIGPIPE flag. |
| */ |
| #ifdef __APPLE__ |
| #define MSG_NOSIGNAL SO_NOSIGPIPE |
| #endif |
| |
| #ifndef LWS_MAX_HEADER_NAME_LENGTH |
| #define LWS_MAX_HEADER_NAME_LENGTH 64 |
| #endif |
| #ifndef LWS_MAX_HEADER_LEN |
| #define LWS_MAX_HEADER_LEN 4096 |
| #endif |
| #ifndef LWS_INITIAL_HDR_ALLOC |
| #define LWS_INITIAL_HDR_ALLOC 256 |
| #endif |
| #ifndef LWS_ADDITIONAL_HDR_ALLOC |
| #define LWS_ADDITIONAL_HDR_ALLOC 64 |
| #endif |
| #ifndef MAX_USER_RX_BUFFER |
| #define MAX_USER_RX_BUFFER 4096 |
| #endif |
| #ifndef LWS_MAX_PROTOCOLS |
| #define LWS_MAX_PROTOCOLS 10 |
| #endif |
| #ifndef LWS_MAX_EXTENSIONS_ACTIVE |
| #define LWS_MAX_EXTENSIONS_ACTIVE 10 |
| #endif |
| #ifndef SPEC_LATEST_SUPPORTED |
| #define SPEC_LATEST_SUPPORTED 13 |
| #endif |
| #ifndef AWAITING_TIMEOUT |
| #define AWAITING_TIMEOUT 5 |
| #endif |
| #ifndef CIPHERS_LIST_STRING |
| #define CIPHERS_LIST_STRING "DEFAULT" |
| #endif |
| #ifndef LWS_SOMAXCONN |
| #define LWS_SOMAXCONN SOMAXCONN |
| #endif |
| |
| #define MAX_WEBSOCKET_04_KEY_LEN 128 |
| |
| #ifndef SYSTEM_RANDOM_FILEPATH |
| #define SYSTEM_RANDOM_FILEPATH "/dev/urandom" |
| #endif |
| #ifndef LWS_MAX_ZLIB_CONN_BUFFER |
| #define LWS_MAX_ZLIB_CONN_BUFFER (64 * 1024) |
| #endif |
| |
| /* |
| * if not in a connection storm, check for incoming |
| * connections this many normal connection services |
| */ |
| #define LWS_LISTEN_SERVICE_MODULO 10 |
| |
| enum lws_websocket_opcodes_07 { |
| LWS_WS_OPCODE_07__CONTINUATION = 0, |
| LWS_WS_OPCODE_07__TEXT_FRAME = 1, |
| LWS_WS_OPCODE_07__BINARY_FRAME = 2, |
| |
| LWS_WS_OPCODE_07__NOSPEC__MUX = 7, |
| |
| /* control extensions 8+ */ |
| |
| LWS_WS_OPCODE_07__CLOSE = 8, |
| LWS_WS_OPCODE_07__PING = 9, |
| LWS_WS_OPCODE_07__PONG = 0xa, |
| }; |
| |
| |
| enum lws_connection_states { |
| WSI_STATE_HTTP, |
| WSI_STATE_HTTP_ISSUING_FILE, |
| WSI_STATE_HTTP_HEADERS, |
| WSI_STATE_DEAD_SOCKET, |
| WSI_STATE_ESTABLISHED, |
| WSI_STATE_CLIENT_UNCONNECTED, |
| WSI_STATE_RETURNED_CLOSE_ALREADY, |
| WSI_STATE_AWAITING_CLOSE_ACK, |
| }; |
| |
| enum lws_rx_parse_state { |
| LWS_RXPS_NEW, |
| |
| LWS_RXPS_04_MASK_NONCE_1, |
| LWS_RXPS_04_MASK_NONCE_2, |
| LWS_RXPS_04_MASK_NONCE_3, |
| |
| LWS_RXPS_04_FRAME_HDR_1, |
| LWS_RXPS_04_FRAME_HDR_LEN, |
| LWS_RXPS_04_FRAME_HDR_LEN16_2, |
| LWS_RXPS_04_FRAME_HDR_LEN16_1, |
| LWS_RXPS_04_FRAME_HDR_LEN64_8, |
| LWS_RXPS_04_FRAME_HDR_LEN64_7, |
| LWS_RXPS_04_FRAME_HDR_LEN64_6, |
| LWS_RXPS_04_FRAME_HDR_LEN64_5, |
| LWS_RXPS_04_FRAME_HDR_LEN64_4, |
| LWS_RXPS_04_FRAME_HDR_LEN64_3, |
| LWS_RXPS_04_FRAME_HDR_LEN64_2, |
| LWS_RXPS_04_FRAME_HDR_LEN64_1, |
| |
| LWS_RXPS_07_COLLECT_FRAME_KEY_1, |
| LWS_RXPS_07_COLLECT_FRAME_KEY_2, |
| LWS_RXPS_07_COLLECT_FRAME_KEY_3, |
| LWS_RXPS_07_COLLECT_FRAME_KEY_4, |
| |
| LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED |
| }; |
| |
| |
| enum connection_mode { |
| LWS_CONNMODE_HTTP_SERVING, |
| |
| LWS_CONNMODE_WS_SERVING, |
| LWS_CONNMODE_WS_CLIENT, |
| |
| /* transient, ssl delay hiding */ |
| LWS_CONNMODE_SSL_ACK_PENDING, |
| |
| /* transient modes */ |
| LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY, |
| LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE, |
| LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY, |
| LWS_CONNMODE_WS_CLIENT_WAITING_EXTENSION_CONNECT, |
| LWS_CONNMODE_WS_CLIENT_PENDING_CANDIDATE_CHILD, |
| |
| /* special internal types */ |
| LWS_CONNMODE_SERVER_LISTENER, |
| }; |
| |
| struct libwebsocket_protocols; |
| struct libwebsocket; |
| |
| struct libwebsocket_context { |
| struct pollfd *fds; |
| struct libwebsocket **lws_lookup; /* fd to wsi */ |
| int fds_count; |
| int max_fds; |
| int listen_port; |
| char http_proxy_address[256]; |
| char canonical_hostname[1024]; |
| unsigned int http_proxy_port; |
| unsigned int options; |
| unsigned long last_timeout_check_s; |
| |
| int started_with_parent; |
| |
| int fd_random; |
| int listen_service_modulo; |
| int listen_service_count; |
| int listen_service_fd; |
| int listen_service_extraseen; |
| |
| #ifdef LWS_LATENCY |
| unsigned long worst_latency; |
| char worst_latency_info[256]; |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| int use_ssl; |
| SSL_CTX *ssl_ctx; |
| SSL_CTX *ssl_client_ctx; |
| #endif |
| struct libwebsocket_protocols *protocols; |
| int count_protocols; |
| #ifndef LWS_NO_EXTENSIONS |
| struct libwebsocket_extension *extensions; |
| #endif |
| void *user_space; |
| }; |
| |
| |
| enum pending_timeout { |
| NO_PENDING_TIMEOUT = 0, |
| PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE, |
| PENDING_TIMEOUT_ESTABLISH_WITH_SERVER, |
| PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE, |
| PENDING_TIMEOUT_AWAITING_PING, |
| PENDING_TIMEOUT_CLOSE_ACK, |
| PENDING_TIMEOUT_AWAITING_EXTENSION_CONNECT_RESPONSE, |
| PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE, |
| PENDING_TIMEOUT_SSL_ACCEPT, |
| }; |
| |
| |
| /* |
| * This is totally opaque to code using the library. It's exported as a |
| * forward-reference pointer-only declaration; the user can use the pointer with |
| * other APIs to get information out of it. |
| */ |
| |
| struct _lws_http_mode_related { |
| char filepath[PATH_MAX]; |
| unsigned long filepos; |
| unsigned long filelen; |
| }; |
| |
| struct _lws_header_related { |
| char name_buffer[LWS_MAX_HEADER_NAME_LENGTH]; |
| int name_buffer_pos; |
| int lextable_pos; |
| enum lws_token_indexes parser_state; |
| int current_alloc_len; |
| #ifndef LWS_NO_CLIENT |
| char initial_handshake_hash_base64[30]; |
| #endif |
| }; |
| |
| struct _lws_websocket_related { |
| char rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING + MAX_USER_RX_BUFFER + |
| LWS_SEND_BUFFER_POST_PADDING]; |
| int rx_user_buffer_head; |
| unsigned char masking_key_04[20]; |
| unsigned char frame_masking_nonce_04[4]; |
| unsigned char frame_mask_04[20]; |
| unsigned char frame_mask_index; |
| size_t rx_packet_length; |
| unsigned char opcode; |
| unsigned char final; |
| unsigned char rsv; |
| int frame_is_binary:1; |
| int pings_vs_pongs; |
| char all_zero_nonce; |
| enum lws_close_status close_reason; |
| unsigned char *rxflow_buffer; |
| int rxflow_len; |
| int rxflow_pos; |
| int rxflow_change_to; |
| char this_frame_masked; |
| }; |
| |
| struct libwebsocket { |
| |
| /* lifetime members */ |
| |
| const struct libwebsocket_protocols *protocol; |
| #ifndef LWS_NO_EXTENSIONS |
| struct libwebsocket_extension * |
| active_extensions[LWS_MAX_EXTENSIONS_ACTIVE]; |
| void *active_extensions_user[LWS_MAX_EXTENSIONS_ACTIVE]; |
| int count_active_extensions; |
| char extension_data_pending; |
| struct libwebsocket *extension_handles; |
| struct libwebsocket *candidate_children_list; |
| #endif |
| int ietf_spec_revision; |
| |
| enum connection_mode mode; |
| enum lws_connection_states state; |
| enum lws_rx_parse_state lws_rx_parse_state; |
| |
| enum pending_timeout pending_timeout; |
| unsigned long pending_timeout_limit; |
| |
| int sock; |
| int position_in_fds_table; |
| #ifdef LWS_LATENCY |
| unsigned long action_start; |
| unsigned long latency_start; |
| #endif |
| |
| void *user_space; |
| |
| /* members with mutually exclusive lifetimes are unionized */ |
| |
| union u { |
| struct _lws_http_mode_related http; |
| struct _lws_header_related hdr; |
| struct _lws_websocket_related ws; |
| } u; |
| |
| struct lws_tokens utf8_token[WSI_TOKEN_COUNT]; |
| |
| enum libwebsocket_write_protocol rx_frame_type; |
| |
| #ifndef LWS_NO_CLIENT |
| char *c_path; |
| char *c_host; |
| char *c_origin; |
| char *c_protocol; |
| callback_function *c_callback; |
| |
| char *c_address; |
| int c_port; |
| #endif |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| SSL *ssl; |
| BIO *client_bio; |
| int use_ssl; |
| #endif |
| }; |
| |
| #ifndef LWS_LATENCY |
| static void lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi, const char *action, int ret, int completion) { while (0); } |
| static void lws_latency_pre(struct libwebsocket_context *context, struct libwebsocket *wsi) { while (0); } |
| #else |
| #define lws_latency_pre(_context, _wsi) lws_latency(_context, _wsi, NULL, 0, 0) |
| extern void |
| lws_latency(struct libwebsocket_context *context, struct libwebsocket *wsi, const char *action, int ret, int completion); |
| #endif |
| |
| extern int |
| libwebsocket_client_rx_sm(struct libwebsocket *wsi, unsigned char c); |
| |
| extern int |
| libwebsocket_parse(struct libwebsocket *wsi, unsigned char c); |
| |
| extern int |
| libwebsocket_interpret_incoming_packet(struct libwebsocket *wsi, |
| unsigned char *buf, size_t len); |
| |
| extern int |
| lws_b64_selftest(void); |
| |
| extern struct libwebsocket * |
| wsi_from_fd(struct libwebsocket_context *context, int fd); |
| |
| extern int |
| insert_wsi_socket_into_fds(struct libwebsocket_context *context, struct libwebsocket *wsi); |
| |
| extern void |
| libwebsocket_set_timeout(struct libwebsocket *wsi, |
| enum pending_timeout reason, int secs); |
| |
| extern int |
| lws_issue_raw(struct libwebsocket *wsi, unsigned char *buf, size_t len); |
| |
| |
| extern void |
| libwebsocket_service_timeout_check(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, unsigned int sec); |
| |
| extern struct libwebsocket * |
| __libwebsocket_client_connect_2(struct libwebsocket_context *context, |
| struct libwebsocket *wsi); |
| |
| extern struct libwebsocket * |
| libwebsocket_create_new_server_wsi(struct libwebsocket_context *context); |
| |
| extern char * |
| libwebsockets_generate_client_handshake(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, char *pkt); |
| |
| extern int |
| lws_handle_POLLOUT_event(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, struct pollfd *pollfd); |
| #ifndef LWS_NO_EXTENSIONS |
| extern int |
| lws_any_extension_handled(struct libwebsocket_context *context, |
| struct libwebsocket *wsi, |
| enum libwebsocket_extension_callback_reasons r, |
| void *v, size_t len); |
| |
| extern void * |
| lws_get_extension_user_matching_ext(struct libwebsocket *wsi, |
| struct libwebsocket_extension *ext); |
| #endif |
| |
| extern int |
| lws_client_interpret_server_handshake(struct libwebsocket_context *context, |
| struct libwebsocket *wsi); |
| |
| extern int |
| libwebsocket_rx_sm(struct libwebsocket *wsi, unsigned char c); |
| |
| extern int |
| lws_issue_raw_ext_access(struct libwebsocket *wsi, |
| unsigned char *buf, size_t len); |
| |
| extern int |
| _libwebsocket_rx_flow_control(struct libwebsocket *wsi); |
| |
| extern int |
| user_callback_handle_rxflow(callback_function, struct libwebsocket_context * context, |
| struct libwebsocket *wsi, |
| enum libwebsocket_callback_reasons reason, void *user, |
| void *in, size_t len); |
| |
| #ifndef LWS_OPENSSL_SUPPORT |
| |
| unsigned char * |
| SHA1(const unsigned char *d, size_t n, unsigned char *md); |
| |
| void |
| MD5(const unsigned char *input, int ilen, unsigned char *output); |
| |
| #endif |
