/* * libwebsockets - small server side websockets and web server implementation * * Copyright (C) 2010 Andy Green * * 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 */ #include #include #include #include #include #include #include #include #include #ifdef __MINGW64__ #else #ifdef __MINGW32__ #else #include #endif #endif #include #include #ifdef WIN32 #ifdef __MINGW64__ #else #ifdef __MINGW32__ #else #include #endif #endif #include #include #include #else #include #include #ifndef LWS_NO_FORK #ifdef HAVE_SYS_PRCTL_H #include #endif #endif #include #include #include #include #include #include #endif #ifdef LWS_OPENSSL_SUPPORT #include #include #include #include #include #endif #include "libwebsockets.h" #if 0 #define DEBUG #endif #ifdef DEBUG #ifdef WIN32 static #else static inline #endif void debug(const char *format, ...) { va_list ap; va_start(ap, format); vfprintf(stderr, format, ap); va_end(ap); } #else #ifdef WIN32 static #else static inline #endif void debug(const char *format, ...) { } #endif /* * 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 #define FD_HASHTABLE_MODULUS 32 #define MAX_CLIENTS 100 #define LWS_MAX_HEADER_NAME_LENGTH 64 #define LWS_MAX_HEADER_LEN 4096 #define LWS_INITIAL_HDR_ALLOC 256 #define LWS_ADDITIONAL_HDR_ALLOC 64 #define MAX_USER_RX_BUFFER 4096 #define MAX_BROADCAST_PAYLOAD 2048 #define LWS_MAX_PROTOCOLS 10 #define LWS_MAX_EXTENSIONS_ACTIVE 10 #define SPEC_LATEST_SUPPORTED 13 #define MAX_WEBSOCKET_04_KEY_LEN 128 #define SYSTEM_RANDOM_FILEPATH "/dev/urandom" enum lws_websocket_opcodes_04 { LWS_WS_OPCODE_04__CONTINUATION = 0, LWS_WS_OPCODE_04__CLOSE = 1, LWS_WS_OPCODE_04__PING = 2, LWS_WS_OPCODE_04__PONG = 3, LWS_WS_OPCODE_04__TEXT_FRAME = 4, LWS_WS_OPCODE_04__BINARY_FRAME = 5, LWS_WS_OPCODE_04__RESERVED_6 = 6, LWS_WS_OPCODE_04__RESERVED_7 = 7, LWS_WS_OPCODE_04__RESERVED_8 = 8, LWS_WS_OPCODE_04__RESERVED_9 = 9, LWS_WS_OPCODE_04__RESERVED_A = 0xa, LWS_WS_OPCODE_04__RESERVED_B = 0xb, LWS_WS_OPCODE_04__RESERVED_C = 0xc, LWS_WS_OPCODE_04__RESERVED_D = 0xd, LWS_WS_OPCODE_04__RESERVED_E = 0xe, LWS_WS_OPCODE_04__RESERVED_F = 0xf, }; 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_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_SEEN_76_FF, LWS_RXPS_PULLING_76_LENGTH, LWS_RXPS_EAT_UNTIL_76_FF, 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_WS_SERVING, LWS_CONNMODE_WS_CLIENT, /* 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, LWS_CONNMODE_BROADCAST_PROXY_LISTENER, LWS_CONNMODE_BROADCAST_PROXY }; #define LWS_FD_HASH(fd) ((fd ^ (fd >> 8) ^ (fd >> 16)) % FD_HASHTABLE_MODULUS) struct libwebsocket_fd_hashtable { struct libwebsocket *wsi[MAX_CLIENTS + 1]; int length; }; struct libwebsocket_protocols; struct libwebsocket_context { struct libwebsocket_fd_hashtable fd_hashtable[FD_HASHTABLE_MODULUS]; struct pollfd fds[MAX_CLIENTS * FD_HASHTABLE_MODULUS + 1]; int fds_count; 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 fd_random; #ifdef LWS_OPENSSL_SUPPORT int use_ssl; SSL_CTX *ssl_ctx; SSL_CTX *ssl_client_ctx; #endif struct libwebsocket_protocols *protocols; int count_protocols; struct libwebsocket_extension *extensions; }; 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, }; /* * 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 libwebsocket { const struct libwebsocket_protocols *protocol; struct libwebsocket_extension * active_extensions[LWS_MAX_EXTENSIONS_ACTIVE]; void *active_extensions_user[LWS_MAX_EXTENSIONS_ACTIVE]; int count_active_extensions; enum lws_connection_states state; char name_buffer[LWS_MAX_HEADER_NAME_LENGTH]; int name_buffer_pos; int current_alloc_len; enum lws_token_indexes parser_state; struct lws_tokens utf8_token[WSI_TOKEN_COUNT]; int ietf_spec_revision; char rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING + MAX_USER_RX_BUFFER + LWS_SEND_BUFFER_POST_PADDING]; int rx_user_buffer_head; enum libwebsocket_write_protocol rx_frame_type; int protocol_index_for_broadcast_proxy; enum pending_timeout pending_timeout; unsigned long pending_timeout_limit; int sock; enum lws_rx_parse_state lws_rx_parse_state; char extension_data_pending; struct libwebsocket *candidate_children_list; struct libwebsocket *extension_handles; /* 04 protocol specific */ char key_b64[150]; 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; int pings_vs_pongs; unsigned char (*xor_mask)(struct libwebsocket *, unsigned char); char all_zero_nonce; enum lws_close_status close_reason; /* 07 specific */ char this_frame_masked; /* client support */ char initial_handshake_hash_base64[30]; enum connection_mode mode; char *c_path; char *c_host; char *c_origin; char *c_protocol; callback_function *c_callback; char *c_address; int c_port; #ifdef LWS_OPENSSL_SUPPORT SSL *ssl; BIO *client_bio; int use_ssl; #endif void *user_space; }; 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 libwebsocket_read(struct libwebsocket_context *context, struct libwebsocket *wsi, unsigned char *buf, size_t len); extern int lws_b64_selftest(void); extern unsigned char xor_no_mask(struct libwebsocket *wsi, unsigned char c); extern unsigned char xor_mask_04(struct libwebsocket *wsi, unsigned char c); extern unsigned char xor_mask_05(struct libwebsocket *wsi, unsigned char c); extern struct libwebsocket * wsi_from_fd(struct libwebsocket_context *context, int fd); extern int insert_wsi(struct libwebsocket_context *context, struct libwebsocket *wsi); extern int delete_from_fd(struct libwebsocket_context *context, int fd); 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); 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); 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); #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