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libwebsockets/lib/private-libwebsockets.h
Andy Green a41314f3bf introduce x google mux very draft indeed 
This is initial x-google-mux support.  It's disabled by default
since it's very pre-alpha.

1) To enable it, reconfigure with --enable-x-google-mux

2) It conflicts with deflate-stream, use the -u switch on
   the test client to disable deflate-stream

3) It deviates from the google standard by sending full
   headers in the addchannel subcommand rather than just
   changed ones from original connect

4) Quota is not implemented yet

5) Close of subchannel is not really implemented yet

6) Google opcode 0xf is changed to 0x7 to account for
   v7 protocol changes to opcode layout

However despite those caveats, in fact it can run the
test client reliably over one socket (both dumb-increment
and lws-mirror-protocol), you can open a browser on the
same test server too and see the circles, etc.

Signed-off-by: Andy Green <andy@warmcat.com>
2011-05-23 10:00:03 +01:00

426 lines
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/*
* 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 <stdarg.h>
#include <sys/stat.h>
#ifdef WIN32
#include <time.h >
#include <winsock2.h>
#include <ws2ipdef.h>
#include <windows.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#ifndef LWS_NO_FORK
#include <sys/prctl.h>
#endif
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <poll.h>
#include <sys/mman.h>
#include <sys/time.h>
#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"
#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 7
#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;
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);
#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
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