| /* |
| * libwebsockets - small server side websockets and web server implementation |
| * |
| * Copyright (C) 2010 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 |
| */ |
| |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <strings.h> |
| #include <ctype.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <signal.h> |
| #include <netdb.h> |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/socket.h> |
| #ifndef LWS_NO_FORK |
| #include <sys/prctl.h> |
| #endif |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| #include <poll.h> |
| #include <sys/mman.h> |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| #include <openssl/ssl.h> |
| #include <openssl/evp.h> |
| #include <openssl/err.h> |
| #endif |
| |
| #include <openssl/md5.h> |
| #include <openssl/sha.h> |
| #include "libwebsockets.h" |
| |
| #if 0 |
| #define DEBUG |
| #endif |
| |
| #ifdef DEBUG |
| static inline void debug(const char *format, ...) |
| { |
| va_list ap; |
| va_start(ap, format); vfprintf(stderr, format, ap); va_end(ap); |
| } |
| #else |
| static inline void debug(const char *format, ...) |
| { |
| } |
| #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 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, |
| }; |
| |
| 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 |
| }; |
| |
| 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_PAYLOAD_UNTIL_LENGTH_EXHAUSTED |
| }; |
| |
| |
| enum connection_mode { |
| LWS_CONNMODE_WS_SERVING, |
| LWS_CONNMODE_WS_CLIENT, |
| |
| /* 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; |
| |
| 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; |
| }; |
| |
| |
| |
| /* |
| * 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; |
| |
| 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; |
| int protocol_index_for_broadcast_proxy; |
| |
| int sock; |
| |
| enum lws_rx_parse_state lws_rx_parse_state; |
| |
| /* 04 protocol specific */ |
| |
| 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; |
| |
| /* client support */ |
| char initial_handshake_hash_base64[30]; |
| enum connection_mode mode; |
| |
| #ifdef LWS_OPENSSL_SUPPORT |
| SSL *ssl; |
| BIO *client_bio; |
| #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 *this, struct libwebsocket *wsi, |
| unsigned char * buf, size_t len); |
| |
| extern int |
| lws_b64_encode_string(const char *in, int in_len, char *out, int out_size); |
| |
| extern int |
| lws_b64_decode_string(const char *in, char *out, int out_size); |
| |
| 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 *this, int fd); |
| |
| extern int |
| insert_wsi(struct libwebsocket_context *this, struct libwebsocket *wsi); |
| |
| extern int |
| delete_from_fd(struct libwebsocket_context *this, int fd); |