mirror of
https://github.com/warmcat/libwebsockets.git
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312 lines
7.3 KiB
C
312 lines
7.3 KiB
C
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 Andy Green <andy@warmcat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation:
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <netdb.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#ifndef LWS_NO_FORK
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#include <sys/prctl.h>
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#endif
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <poll.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#ifdef LWS_OPENSSL_SUPPORT
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#include <openssl/ssl.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/md5.h>
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#include <openssl/sha.h>
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#endif
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#include "libwebsockets.h"
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#if 0
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#define DEBUG
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#endif
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#ifdef DEBUG
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static inline void debug(const char *format, ...)
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{
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va_list ap;
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va_start(ap, format); vfprintf(stderr, format, ap); va_end(ap);
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}
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#else
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static inline void debug(const char *format, ...)
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{
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}
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#endif
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/*
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* Mac OSX as well as iOS do not define the MSG_NOSIGNAL flag,
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* but happily have something equivalent in the SO_NOSIGPIPE flag.
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*/
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#ifdef __APPLE__
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#define MSG_NOSIGNAL SO_NOSIGPIPE
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#endif
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#define FD_HASHTABLE_MODULUS 32
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#define MAX_CLIENTS 100
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#define LWS_MAX_HEADER_NAME_LENGTH 64
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#define LWS_MAX_HEADER_LEN 4096
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#define LWS_INITIAL_HDR_ALLOC 256
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#define LWS_ADDITIONAL_HDR_ALLOC 64
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#define MAX_USER_RX_BUFFER 4096
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#define MAX_BROADCAST_PAYLOAD 2048
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#define LWS_MAX_PROTOCOLS 10
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#define MAX_WEBSOCKET_04_KEY_LEN 128
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#define SYSTEM_RANDOM_FILEPATH "/dev/urandom"
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enum lws_websocket_opcodes_04 {
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LWS_WS_OPCODE_04__CONTINUATION = 0,
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LWS_WS_OPCODE_04__CLOSE = 1,
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LWS_WS_OPCODE_04__PING = 2,
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LWS_WS_OPCODE_04__PONG = 3,
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LWS_WS_OPCODE_04__TEXT_FRAME = 4,
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LWS_WS_OPCODE_04__BINARY_FRAME = 5,
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};
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enum lws_connection_states {
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WSI_STATE_HTTP,
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WSI_STATE_HTTP_HEADERS,
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WSI_STATE_DEAD_SOCKET,
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WSI_STATE_ESTABLISHED,
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WSI_STATE_CLIENT_UNCONNECTED,
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WSI_STATE_RETURNED_CLOSE_ALREADY,
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};
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enum lws_rx_parse_state {
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LWS_RXPS_NEW,
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LWS_RXPS_SEEN_76_FF,
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LWS_RXPS_PULLING_76_LENGTH,
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LWS_RXPS_EAT_UNTIL_76_FF,
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LWS_RXPS_04_MASK_NONCE_1,
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LWS_RXPS_04_MASK_NONCE_2,
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LWS_RXPS_04_MASK_NONCE_3,
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LWS_RXPS_04_FRAME_HDR_1,
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LWS_RXPS_04_FRAME_HDR_LEN,
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LWS_RXPS_04_FRAME_HDR_LEN16_2,
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LWS_RXPS_04_FRAME_HDR_LEN16_1,
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LWS_RXPS_04_FRAME_HDR_LEN64_8,
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LWS_RXPS_04_FRAME_HDR_LEN64_7,
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LWS_RXPS_04_FRAME_HDR_LEN64_6,
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LWS_RXPS_04_FRAME_HDR_LEN64_5,
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LWS_RXPS_04_FRAME_HDR_LEN64_4,
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LWS_RXPS_04_FRAME_HDR_LEN64_3,
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LWS_RXPS_04_FRAME_HDR_LEN64_2,
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LWS_RXPS_04_FRAME_HDR_LEN64_1,
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LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED
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};
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enum connection_mode {
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LWS_CONNMODE_WS_SERVING,
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LWS_CONNMODE_WS_CLIENT,
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/* transient modes */
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LWS_CONNMODE_WS_CLIENT_WAITING_PROXY_REPLY,
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LWS_CONNMODE_WS_CLIENT_ISSUE_HANDSHAKE,
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LWS_CONNMODE_WS_CLIENT_WAITING_SERVER_REPLY,
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/* special internal types */
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LWS_CONNMODE_SERVER_LISTENER,
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LWS_CONNMODE_BROADCAST_PROXY_LISTENER,
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LWS_CONNMODE_BROADCAST_PROXY
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};
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#define LWS_FD_HASH(fd) ((fd ^ (fd >> 8) ^ (fd >> 16)) % FD_HASHTABLE_MODULUS)
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struct libwebsocket_fd_hashtable {
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struct libwebsocket *wsi[MAX_CLIENTS + 1];
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int length;
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};
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struct libwebsocket_protocols;
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struct libwebsocket_context {
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struct libwebsocket_fd_hashtable fd_hashtable[FD_HASHTABLE_MODULUS];
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struct pollfd fds[MAX_CLIENTS * FD_HASHTABLE_MODULUS + 1];
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int fds_count;
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int listen_port;
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char http_proxy_address[256];
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char canonical_hostname[1024];
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unsigned int http_proxy_port;
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unsigned int options;
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unsigned long last_timeout_check_s;
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int fd_random;
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#ifdef LWS_OPENSSL_SUPPORT
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int use_ssl;
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SSL_CTX *ssl_ctx;
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SSL_CTX *ssl_client_ctx;
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#endif
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struct libwebsocket_protocols *protocols;
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int count_protocols;
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};
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enum pending_timeout {
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NO_PENDING_TIMEOUT = 0,
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PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE,
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PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
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PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE,
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PENDING_TIMEOUT_AWAITING_PING,
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};
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/*
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* This is totally opaque to code using the library. It's exported as a
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* forward-reference pointer-only declaration; the user can use the pointer with
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* other APIs to get information out of it.
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*/
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struct libwebsocket {
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const struct libwebsocket_protocols *protocol;
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enum lws_connection_states state;
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char name_buffer[LWS_MAX_HEADER_NAME_LENGTH];
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int name_buffer_pos;
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int current_alloc_len;
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enum lws_token_indexes parser_state;
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struct lws_tokens utf8_token[WSI_TOKEN_COUNT];
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int ietf_spec_revision;
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char rx_user_buffer[LWS_SEND_BUFFER_PRE_PADDING + MAX_USER_RX_BUFFER +
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LWS_SEND_BUFFER_POST_PADDING];
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int rx_user_buffer_head;
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int protocol_index_for_broadcast_proxy;
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enum pending_timeout pending_timeout;
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unsigned long pending_timeout_limit;
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int sock;
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enum lws_rx_parse_state lws_rx_parse_state;
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/* 04 protocol specific */
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char key_b64[150];
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unsigned char masking_key_04[20];
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unsigned char frame_masking_nonce_04[4];
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unsigned char frame_mask_04[20];
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unsigned char frame_mask_index;
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size_t rx_packet_length;
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unsigned char opcode;
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unsigned char final;
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int pings_vs_pongs;
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unsigned char (*xor_mask)(struct libwebsocket *, unsigned char);
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char all_zero_nonce;
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/* client support */
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char initial_handshake_hash_base64[30];
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enum connection_mode mode;
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char *c_path;
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char *c_host;
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char *c_origin;
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char *c_protocol;
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#ifdef LWS_OPENSSL_SUPPORT
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SSL *ssl;
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BIO *client_bio;
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int use_ssl;
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#endif
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void *user_space;
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};
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extern int
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libwebsocket_client_rx_sm(struct libwebsocket *wsi, unsigned char c);
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extern int
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libwebsocket_parse(struct libwebsocket *wsi, unsigned char c);
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extern int
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libwebsocket_interpret_incoming_packet(struct libwebsocket *wsi,
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unsigned char *buf, size_t len);
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extern int
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libwebsocket_read(struct libwebsocket_context *this, struct libwebsocket *wsi,
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unsigned char * buf, size_t len);
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extern int
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lws_b64_encode_string(const char *in, int in_len, char *out, int out_size);
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extern int
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lws_b64_decode_string(const char *in, char *out, int out_size);
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extern int
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lws_b64_selftest(void);
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extern unsigned char
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xor_no_mask(struct libwebsocket *wsi, unsigned char c);
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extern unsigned char
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xor_mask_04(struct libwebsocket *wsi, unsigned char c);
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extern unsigned char
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xor_mask_05(struct libwebsocket *wsi, unsigned char c);
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extern struct libwebsocket *
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wsi_from_fd(struct libwebsocket_context *this, int fd);
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extern int
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insert_wsi(struct libwebsocket_context *this, struct libwebsocket *wsi);
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extern int
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delete_from_fd(struct libwebsocket_context *this, int fd);
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extern void
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libwebsocket_set_timeout(struct libwebsocket *wsi,
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enum pending_timeout reason, int secs);
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#ifndef LWS_OPENSSL_SUPPORT
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unsigned char *
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SHA1(const unsigned char *d, size_t n, unsigned char *md);
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void
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MD5(const unsigned char *input, int ilen, unsigned char *output);
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#endif
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