libwebsockets.h

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/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2016 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
 */

#ifndef LIBWEBSOCKET_H_3060898B846849FF9F88F5DB59B5950C
#define LIBWEBSOCKET_H_3060898B846849FF9F88F5DB59B5950C

#ifdef __cplusplus
#include <cstddef>
#include <cstdarg>
#ifdef MBED_OPERATORS
#include "mbed-drivers/mbed.h"
#include "sal-iface-eth/EthernetInterface.h"
#include "sockets/TCPListener.h"
#include "sal-stack-lwip/lwipv4_init.h"

namespace {
}
using namespace mbed::Sockets::v0;


struct sockaddr_in;
struct lws;

class lws_conn {
        public:
        lws_conn():
                ts(NULL),
                wsi(NULL),
                writeable(1),
                awaiting_on_writeable(0)
        {
        }

public:
        void set_wsi(struct lws *_wsi) { wsi = _wsi; }
        int actual_onRX(Socket *s);
        void onRX(Socket *s);
        void onError(Socket *s, socket_error_t err);
        void onDisconnect(TCPStream *s);
        void onSent(Socket *s, uint16_t len);
        void serialized_writeable(struct lws *wsi);

public:
        TCPStream *ts;

public:
        struct lws *wsi;
        char writeable;
        char awaiting_on_writeable;
};

class lws_conn_listener : lws_conn {
public:
        lws_conn_listener():
                srv(SOCKET_STACK_LWIP_IPV4)
        {
                srv.setOnError(TCPStream::ErrorHandler_t(this,
                                &lws_conn_listener::onError));
        }

        void start(const uint16_t port); 
protected:
        void onRX(Socket *s); 
        void onError(Socket *s, socket_error_t err); 
        void onIncoming(TCPListener *s, void *impl); 
        void onDisconnect(TCPStream *s); 
public:
        TCPListener srv;
};

#endif

extern "C" {
#else
#include <stdarg.h>
#endif

#if defined(MBED_OPERATORS) || defined(LWS_WITH_ESP8266)
struct sockaddr_in;
#define LWS_POSIX 0
#else
#define LWS_POSIX 1
#endif

#include "lws_config.h"

#if defined(WIN32) || defined(_WIN32)
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

#include <winsock2.h>
#include <ws2tcpip.h>
#include <stddef.h>
#include <basetsd.h>
#ifndef _WIN32_WCE
#include <stdint.h>
#include <fcntl.h>
#else
#define _O_RDONLY       0x0000
#define O_RDONLY        _O_RDONLY
#endif

// Visual studio older than 2015 and WIN_CE has only _stricmp
#if (defined(_MSC_VER) && _MSC_VER < 1900) || defined(_WIN32_WCE)
#define strcasecmp _stricmp
#else
#define strcasecmp stricmp
#endif
#define getdtablesize() 30000

#define LWS_INLINE __inline
#define LWS_VISIBLE
#define LWS_WARN_UNUSED_RESULT
#define LWS_WARN_DEPRECATED

#ifdef LWS_DLL
#ifdef LWS_INTERNAL
#define LWS_EXTERN extern __declspec(dllexport)
#else
#define LWS_EXTERN extern __declspec(dllimport)
#endif
#else
#define LWS_EXTERN
#endif

#define LWS_INVALID_FILE INVALID_HANDLE_VALUE
#define LWS_O_RDONLY _O_RDONLY

#if !defined(_MSC_VER) || _MSC_VER < 1900 /* Visual Studio 2015 already defines this in <stdio.h> */
#define snprintf _snprintf
#endif

#ifndef __func__
#define __func__ __FUNCTION__
#endif

#else /* NOT WIN32 */
#include <unistd.h>

#if defined(__NetBSD__) || defined(__FreeBSD__)
#include <netinet/in.h>
#endif

#define LWS_INLINE inline
#define LWS_O_RDONLY O_RDONLY

#if !defined(MBED_OPERATORS) && !defined(LWS_WITH_ESP8266)
#include <poll.h>
#include <netdb.h>
#define LWS_INVALID_FILE -1
#else
#define getdtablesize() (20)
#define LWS_INVALID_FILE NULL
#endif

#if defined(__GNUC__)

/* warn_unused_result attribute only supported by GCC 3.4 or later */
#if __GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
#define LWS_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
#else
#define LWS_WARN_UNUSED_RESULT
#endif

#define LWS_VISIBLE __attribute__((visibility("default")))
#define LWS_WARN_DEPRECATED __attribute__ ((deprecated))
#else
#define LWS_VISIBLE
#define LWS_WARN_UNUSED_RESULT
#define LWS_WARN_DEPRECATED
#endif

#if defined(__ANDROID__)
#include <unistd.h>
#define getdtablesize() sysconf(_SC_OPEN_MAX)
#endif

#endif

#ifdef LWS_USE_LIBEV
#include <ev.h>
#endif /* LWS_USE_LIBEV */
#ifdef LWS_USE_LIBUV
#include <uv.h>
#endif /* LWS_USE_LIBUV */

#ifndef LWS_EXTERN
#define LWS_EXTERN extern
#endif

#ifdef _WIN32
#define random rand
#else
#include <sys/time.h>
#include <unistd.h>
#endif

#ifdef LWS_OPENSSL_SUPPORT

#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
#include <cyassl/openssl/ssl.h>
#include <cyassl/error-ssl.h>
#else
#include <wolfssl/openssl/ssl.h>
#include <wolfssl/error-ssl.h>
#endif /* not USE_OLD_CYASSL */
#else
#if defined(LWS_USE_POLARSSL)
#include <polarssl/ssl.h>
struct lws_polarssl_context {
        x509_crt ca; 
        x509_crt certificate; 
        rsa_context key; 
};
typedef struct lws_polarssl_context SSL_CTX;
typedef ssl_context SSL;
#else
#if defined(LWS_USE_MBEDTLS)
#include <mbedtls/ssl.h>
#else
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif /* not USE_MBEDTLS */
#endif /* not USE_POLARSSL */
#endif /* not USE_WOLFSSL */
#endif


#define CONTEXT_PORT_NO_LISTEN -1


enum lws_log_levels {
        LLL_ERR = 1 << 0,
        LLL_WARN = 1 << 1,
        LLL_NOTICE = 1 << 2,
        LLL_INFO = 1 << 3,
        LLL_DEBUG = 1 << 4,
        LLL_PARSER = 1 << 5,
        LLL_HEADER = 1 << 6,
        LLL_EXT = 1 << 7,
        LLL_CLIENT = 1 << 8,
        LLL_LATENCY = 1 << 9,

        LLL_COUNT = 10 /* set to count of valid flags */
};

LWS_VISIBLE LWS_EXTERN void _lws_log(int filter, const char *format, ...);
LWS_VISIBLE LWS_EXTERN void _lws_logv(int filter, const char *format, va_list vl);
LWS_VISIBLE LWS_EXTERN int
lwsl_timestamp(int level, char *p, int len);

#define lwsl_err(...) _lws_log(LLL_ERR, __VA_ARGS__)

#if !defined(LWS_WITH_NO_LOGS)
/* notice, warn and log are always compiled in */
#define lwsl_warn(...) _lws_log(LLL_WARN, __VA_ARGS__)
#define lwsl_notice(...) _lws_log(LLL_NOTICE, __VA_ARGS__)
#endif
/*
 *  weaker logging can be deselected at configure time using --disable-debug
 *  that gets rid of the overhead of checking while keeping _warn and _err
 *  active
 */

#if defined(LWS_WITH_ESP8266)
#undef _DEBUG
#endif

#ifdef _DEBUG
#if defined(LWS_WITH_NO_LOGS)
/* notice, warn and log are always compiled in */
//#define lwsl_err(...) _lws_log(LLL_ERR, __VA_ARGS__)
#define lwsl_warn(...) _lws_log(LLL_WARN, __VA_ARGS__)
#define lwsl_notice(...) _lws_log(LLL_NOTICE, __VA_ARGS__)
#endif
#define lwsl_info(...) _lws_log(LLL_INFO, __VA_ARGS__)
#define lwsl_debug(...) _lws_log(LLL_DEBUG, __VA_ARGS__)
#define lwsl_parser(...) _lws_log(LLL_PARSER, __VA_ARGS__)
#define lwsl_header(...)  _lws_log(LLL_HEADER, __VA_ARGS__)
#define lwsl_ext(...)  _lws_log(LLL_EXT, __VA_ARGS__)
#define lwsl_client(...) _lws_log(LLL_CLIENT, __VA_ARGS__)
#define lwsl_latency(...) _lws_log(LLL_LATENCY, __VA_ARGS__)

LWS_VISIBLE LWS_EXTERN void lwsl_hexdump(void *buf, size_t len);

#else /* no debug */
#if defined(LWS_WITH_NO_LOGS)
//#define lwsl_err(...) do {} while(0)
#define lwsl_warn(...) do {} while(0)
#define lwsl_notice(...) do {} while(0)
#endif
#define lwsl_info(...) do {} while(0)
#define lwsl_debug(...) do {} while(0)
#define lwsl_parser(...) do {} while(0)
#define lwsl_header(...) do {} while(0)
#define lwsl_ext(...) do {} while(0)
#define lwsl_client(...) do {} while(0)
#define lwsl_latency(...) do {} while(0)
#define lwsl_hexdump(a, b)

#endif

LWS_VISIBLE LWS_EXTERN void
lws_set_log_level(int level,
                  void (*log_emit_function)(int level, const char *line));

LWS_VISIBLE LWS_EXTERN void
lwsl_emit_syslog(int level, const char *line);



#include <stddef.h>

#ifndef lws_container_of
#define lws_container_of(P,T,M) ((T *)((char *)(P) - offsetof(T, M)))
#endif


struct lws;
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
#endif

/* api change list for user code to test against */

#define LWS_FEATURE_SERVE_HTTP_FILE_HAS_OTHER_HEADERS_ARG

/* the struct lws_protocols has the id field present */
#define LWS_FEATURE_PROTOCOLS_HAS_ID_FIELD

/* you can call lws_get_peer_write_allowance */
#define LWS_FEATURE_PROTOCOLS_HAS_PEER_WRITE_ALLOWANCE

/* extra parameter introduced in 917f43ab821 */
#define LWS_FEATURE_SERVE_HTTP_FILE_HAS_OTHER_HEADERS_LEN

/* File operations stuff exists */
#define LWS_FEATURE_FOPS


#if defined(_WIN32)
typedef SOCKET lws_sockfd_type;
typedef HANDLE lws_filefd_type;
#define lws_sockfd_valid(sfd) (!!sfd)
struct lws_pollfd {
        lws_sockfd_type fd; 
        SHORT events; 
        SHORT revents; 
};
#define LWS_POLLHUP (FD_CLOSE)
#define LWS_POLLIN (FD_READ | FD_ACCEPT)
#define LWS_POLLOUT (FD_WRITE)
#else

#if defined(MBED_OPERATORS)
/* it's a class lws_conn * */
typedef void * lws_sockfd_type;
typedef void * lws_filefd_type;
#define lws_sockfd_valid(sfd) (!!sfd)
struct pollfd {
        lws_sockfd_type fd; 
        short events; 
        short revents; 
};
#define POLLIN          0x0001
#define POLLPRI         0x0002
#define POLLOUT         0x0004
#define POLLERR         0x0008
#define POLLHUP         0x0010
#define POLLNVAL        0x0020

struct lws;

void * mbed3_create_tcp_stream_socket(void);
void mbed3_delete_tcp_stream_socket(void *sockfd);
void mbed3_tcp_stream_bind(void *sock, int port, struct lws *);
void mbed3_tcp_stream_accept(void *sock, struct lws *);
#else
#if defined(LWS_WITH_ESP8266)

#include <user_interface.h>
#include <espconn.h>

typedef struct espconn * lws_sockfd_type;
typedef void * lws_filefd_type;
#define lws_sockfd_valid(sfd) (!!sfd)
struct pollfd {
        lws_sockfd_type fd; 
        short events; 
        short revents; 
};
#define POLLIN          0x0001
#define POLLPRI         0x0002
#define POLLOUT         0x0004
#define POLLERR         0x0008
#define POLLHUP         0x0010
#define POLLNVAL        0x0020

struct lws_vhost;

lws_sockfd_type esp8266_create_tcp_listen_socket(struct lws_vhost *vh);
void esp8266_tcp_stream_accept(lws_sockfd_type fd, struct lws *wsi);

#include <os_type.h>
#include <osapi.h>
#include "ets_sys.h"

int ets_snprintf(char *str, size_t size, const char *format, ...);
#define snprintf  ets_snprintf

typedef os_timer_t uv_timer_t;
typedef void uv_cb_t(uv_timer_t *);

void os_timer_disarm(void *);
void os_timer_setfn(os_timer_t *, os_timer_func_t *, void *);

void ets_timer_arm_new(os_timer_t *, int, int, int);

//void os_timer_arm(os_timer_t *, int, int);

#define UV_VERSION_MAJOR 1

#define lws_uv_getloop(a, b) (NULL)

static inline void uv_timer_init(void *l, uv_timer_t *t)
{
        (void)l;
        memset(t, 0, sizeof(*t));
        os_timer_disarm(t);
}

static inline void uv_timer_start(uv_timer_t *t, uv_cb_t *cb, int first, int rep)
{
        os_timer_setfn(t, (os_timer_func_t *)cb, t);
        /* ms, repeat */
        os_timer_arm(t, first, !!rep);
}

static inline void uv_timer_stop(uv_timer_t *t)
{
        os_timer_disarm(t);
}

#else
typedef int lws_sockfd_type;
typedef int lws_filefd_type;
#define lws_sockfd_valid(sfd) (sfd >= 0)
#endif
#endif

#define lws_pollfd pollfd
#define LWS_POLLHUP (POLLHUP|POLLERR)
#define LWS_POLLIN (POLLIN)
#define LWS_POLLOUT (POLLOUT)
#endif

struct lws_pollargs {
        lws_sockfd_type fd;     
        int events;             
        int prev_events;        
};

struct lws_tokens;
struct lws_token_limits;


/*
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */
enum lws_close_status {
        LWS_CLOSE_STATUS_NOSTATUS                               =    0,
        LWS_CLOSE_STATUS_NORMAL                                 = 1000,
        LWS_CLOSE_STATUS_GOINGAWAY                              = 1001,
        LWS_CLOSE_STATUS_PROTOCOL_ERR                           = 1002,
        LWS_CLOSE_STATUS_UNACCEPTABLE_OPCODE                    = 1003,
        LWS_CLOSE_STATUS_RESERVED                               = 1004,
        LWS_CLOSE_STATUS_NO_STATUS                              = 1005,
        LWS_CLOSE_STATUS_ABNORMAL_CLOSE                         = 1006,
        LWS_CLOSE_STATUS_INVALID_PAYLOAD                        = 1007,
        LWS_CLOSE_STATUS_POLICY_VIOLATION                       = 1008,
        LWS_CLOSE_STATUS_MESSAGE_TOO_LARGE                      = 1009,
        LWS_CLOSE_STATUS_EXTENSION_REQUIRED                     = 1010,
        LWS_CLOSE_STATUS_UNEXPECTED_CONDITION                   = 1011,
        LWS_CLOSE_STATUS_TLS_FAILURE                            = 1015,
        /****** add new things just above ---^ ******/

        LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY               = 9999,
};

LWS_VISIBLE LWS_EXTERN void
lws_close_reason(struct lws *wsi, enum lws_close_status status,
                 unsigned char *buf, size_t len);


struct lws;
struct lws_context;
/* needed even with extensions disabled for create context */
struct lws_extension;



/*
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */
enum lws_callback_reasons {
        LWS_CALLBACK_ESTABLISHED                                =  0,
        LWS_CALLBACK_CLIENT_CONNECTION_ERROR                    =  1,
        LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH                =  2,
        LWS_CALLBACK_CLIENT_ESTABLISHED                         =  3,
        LWS_CALLBACK_CLOSED                                     =  4,
        LWS_CALLBACK_CLOSED_HTTP                                =  5,
        LWS_CALLBACK_RECEIVE                                    =  6,
        LWS_CALLBACK_RECEIVE_PONG                               =  7,
        LWS_CALLBACK_CLIENT_RECEIVE                             =  8,
        LWS_CALLBACK_CLIENT_RECEIVE_PONG                        =  9,
        LWS_CALLBACK_CLIENT_WRITEABLE                           = 10,
        LWS_CALLBACK_SERVER_WRITEABLE                           = 11,
        LWS_CALLBACK_HTTP                                       = 12,
        LWS_CALLBACK_HTTP_BODY                                  = 13,
        LWS_CALLBACK_HTTP_BODY_COMPLETION                       = 14,
        LWS_CALLBACK_HTTP_FILE_COMPLETION                       = 15,
        LWS_CALLBACK_HTTP_WRITEABLE                             = 16,
        LWS_CALLBACK_FILTER_NETWORK_CONNECTION                  = 17,
        LWS_CALLBACK_FILTER_HTTP_CONNECTION                     = 18,
        LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED             = 19,
        LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION                 = 20,
        LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS     = 21,
        LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS     = 22,
        LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION   = 23,
        LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER             = 24,
        LWS_CALLBACK_CONFIRM_EXTENSION_OKAY                     = 25,
        LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED         = 26,
        LWS_CALLBACK_PROTOCOL_INIT                              = 27,
        LWS_CALLBACK_PROTOCOL_DESTROY                           = 28,
        LWS_CALLBACK_WSI_CREATE                                 = 29,
        LWS_CALLBACK_WSI_DESTROY                                = 30,
        LWS_CALLBACK_GET_THREAD_ID                              = 31,
        /* external poll() management support */
        LWS_CALLBACK_ADD_POLL_FD                                = 32,
        LWS_CALLBACK_DEL_POLL_FD                                = 33,
        LWS_CALLBACK_CHANGE_MODE_POLL_FD                        = 34,
        LWS_CALLBACK_LOCK_POLL                                  = 35,
        LWS_CALLBACK_UNLOCK_POLL                                = 36,
        LWS_CALLBACK_OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY       = 37,
        LWS_CALLBACK_WS_PEER_INITIATED_CLOSE                    = 38,
        LWS_CALLBACK_WS_EXT_DEFAULTS                            = 39,
        LWS_CALLBACK_CGI                                        = 40,
        LWS_CALLBACK_CGI_TERMINATED                             = 41,
        LWS_CALLBACK_CGI_STDIN_DATA                             = 42,
        LWS_CALLBACK_CGI_STDIN_COMPLETED                        = 43,
        LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP                    = 44,
        LWS_CALLBACK_CLOSED_CLIENT_HTTP                         = 45,
        LWS_CALLBACK_RECEIVE_CLIENT_HTTP                        = 46,
        LWS_CALLBACK_COMPLETED_CLIENT_HTTP                      = 47,
        LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ                   = 48,
        LWS_CALLBACK_HTTP_BIND_PROTOCOL                         = 49,
        LWS_CALLBACK_HTTP_DROP_PROTOCOL                         = 50,
        LWS_CALLBACK_CHECK_ACCESS_RIGHTS                        = 51,
        LWS_CALLBACK_PROCESS_HTML                               = 52,
        LWS_CALLBACK_ADD_HEADERS                                = 53,
        LWS_CALLBACK_SESSION_INFO                               = 54,
        LWS_CALLBACK_GS_EVENT                                   = 55,
        LWS_CALLBACK_HTTP_PMO                                   = 56,
        /****** add new things just above ---^ ******/

        LWS_CALLBACK_USER = 1000,
};



typedef int
lws_callback_function(struct lws *wsi, enum lws_callback_reasons reason,
                    void *user, void *in, size_t len);


/*
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */
enum lws_extension_callback_reasons {
        LWS_EXT_CB_SERVER_CONTEXT_CONSTRUCT             =  0,
        LWS_EXT_CB_CLIENT_CONTEXT_CONSTRUCT             =  1,
        LWS_EXT_CB_SERVER_CONTEXT_DESTRUCT              =  2,
        LWS_EXT_CB_CLIENT_CONTEXT_DESTRUCT              =  3,
        LWS_EXT_CB_CONSTRUCT                            =  4,
        LWS_EXT_CB_CLIENT_CONSTRUCT                     =  5,
        LWS_EXT_CB_CHECK_OK_TO_REALLY_CLOSE             =  6,
        LWS_EXT_CB_CHECK_OK_TO_PROPOSE_EXTENSION        =  7,
        LWS_EXT_CB_DESTROY                              =  8,
        LWS_EXT_CB_DESTROY_ANY_WSI_CLOSING              =  9,
        LWS_EXT_CB_ANY_WSI_ESTABLISHED                  = 10,
        LWS_EXT_CB_PACKET_RX_PREPARSE                   = 11,
        LWS_EXT_CB_PACKET_TX_PRESEND                    = 12,
        LWS_EXT_CB_PACKET_TX_DO_SEND                    = 13,
        LWS_EXT_CB_HANDSHAKE_REPLY_TX                   = 14,
        LWS_EXT_CB_FLUSH_PENDING_TX                     = 15,
        LWS_EXT_CB_EXTENDED_PAYLOAD_RX                  = 16,
        LWS_EXT_CB_CAN_PROXY_CLIENT_CONNECTION          = 17,
        LWS_EXT_CB_1HZ                                  = 18,
        LWS_EXT_CB_REQUEST_ON_WRITEABLE                 = 19,
        LWS_EXT_CB_IS_WRITEABLE                         = 20,
        LWS_EXT_CB_PAYLOAD_TX                           = 21,
        LWS_EXT_CB_PAYLOAD_RX                           = 22,
        LWS_EXT_CB_OPTION_DEFAULT                       = 23,
        LWS_EXT_CB_OPTION_SET                           = 24,
        LWS_EXT_CB_OPTION_CONFIRM                       = 25,
        LWS_EXT_CB_NAMED_OPTION_SET                     = 26,

        /****** add new things just above ---^ ******/
};

enum lws_ext_options_types {
        EXTARG_NONE, 
        EXTARG_DEC,  
        EXTARG_OPT_DEC 
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};

struct lws_ext_options {
        const char *name; 
        enum lws_ext_options_types type; 
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};

struct lws_ext_option_arg {
        const char *option_name; 
        int option_index; 
        const char *start; 
        int len; 
};

typedef int
lws_extension_callback_function(struct lws_context *context,
                              const struct lws_extension *ext, struct lws *wsi,
                              enum lws_extension_callback_reasons reason,
                              void *user, void *in, size_t len);

struct lws_extension {
        const char *name; 
        lws_extension_callback_function *callback; 
        const char *client_offer; 
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};

LWS_VISIBLE LWS_EXTERN int
lws_set_extension_option(struct lws *wsi, const char *ext_name,
                         const char *opt_name, const char *opt_val);

#ifndef LWS_NO_EXTENSIONS
/* lws_get_internal_extensions() - DEPRECATED
 *
 * \Deprecated There is no longer a set internal extensions table.  The table is provided
 * by user code along with application-specific settings.  See the test
 * client and server for how to do.
 */
static LWS_INLINE LWS_WARN_DEPRECATED const struct lws_extension *
lws_get_internal_extensions() { return NULL; }

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_ext_parse_options(const struct lws_extension *ext, struct lws *wsi,
                       void *ext_user, const struct lws_ext_options *opts,
                       const char *o, int len);
#endif

LWS_EXTERN
int lws_extension_callback_pm_deflate(
        struct lws_context *context, const struct lws_extension *ext,
        struct lws *wsi, enum lws_extension_callback_reasons reason,
        void *user, void *in, size_t len);

/*
 * The internal exts are part of the public abi
 * If we add more extensions, publish the callback here  ------v
 */


struct lws_protocols {
        const char *name;
        lws_callback_function *callback;
        size_t per_session_data_size;
        size_t rx_buffer_size;
        unsigned int id;
        void *user; 
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};

struct lws_vhost;

LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
lws_vhost_name_to_protocol(struct lws_vhost *vh, const char *name);

LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
lws_get_protocol(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN const struct lws_protocols *
lws_protocol_get(struct lws *wsi) LWS_WARN_DEPRECATED;

LWS_VISIBLE LWS_EXTERN void *
lws_protocol_vh_priv_zalloc(struct lws_vhost *vhost, const struct lws_protocols *prot,
                            int size);

LWS_VISIBLE LWS_EXTERN void *
lws_protocol_vh_priv_get(struct lws_vhost *vhost, const struct lws_protocols *prot);

LWS_VISIBLE LWS_EXTERN int
lws_finalize_startup(struct lws_context *context);

#ifdef LWS_WITH_PLUGINS

/* PLUGINS implies LIBUV */

#define LWS_PLUGIN_API_MAGIC 180

struct lws_plugin_capability {
        unsigned int api_magic; 
        const struct lws_protocols *protocols; 
        int count_protocols; 
        const struct lws_extension *extensions; 
        int count_extensions; 
};

typedef int (*lws_plugin_init_func)(struct lws_context *,
                                    struct lws_plugin_capability *);
typedef int (*lws_plugin_destroy_func)(struct lws_context *);

struct lws_plugin {
        struct lws_plugin *list; 
#if (UV_VERSION_MAJOR > 0)
        uv_lib_t lib; 
#else
        void *l; 
#endif
        char name[64]; 
        struct lws_plugin_capability caps; 
};

#endif




#define LWSGS_EMAIL_CONTENT_SIZE 16384

/* SHA-1 binary and hexified versions */
typedef struct { unsigned char bin[20]; } lwsgw_hash_bin;
typedef struct { char id[41];  } lwsgw_hash;

enum lwsgs_auth_bits {
        LWSGS_AUTH_LOGGED_IN = 1, 
        LWSGS_AUTH_ADMIN = 2,   
        LWSGS_AUTH_VERIFIED = 4,  
        LWSGS_AUTH_FORGOT_FLOW = 8,     
};

struct lws_session_info {
        char username[32]; 
        char email[100]; 
        char ip[72]; 
        unsigned int mask; 
        char session[42]; 
};

enum lws_gs_event {
        LWSGSE_CREATED, 
        LWSGSE_DELETED  
};

struct lws_gs_event_args {
        enum lws_gs_event event; 
        const char *username; 
        const char *email; 
};




/*
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */

enum lws_context_options {
        LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT     = (1 << 1) |
                                                                  (1 << 12),
        LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME            = (1 << 2),
        LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT             = (1 << 3) |
                                                                  (1 << 12),
        LWS_SERVER_OPTION_LIBEV                                 = (1 << 4),
        LWS_SERVER_OPTION_DISABLE_IPV6                          = (1 << 5),
        LWS_SERVER_OPTION_DISABLE_OS_CA_CERTS                   = (1 << 6),
        LWS_SERVER_OPTION_PEER_CERT_NOT_REQUIRED                = (1 << 7),
        LWS_SERVER_OPTION_VALIDATE_UTF8                         = (1 << 8),
        LWS_SERVER_OPTION_SSL_ECDH                              = (1 << 9) |
                                                                  (1 << 12),
        LWS_SERVER_OPTION_LIBUV                                 = (1 << 10),
        LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS                = (1 << 11) |
                                                                  (1 << 12),
        LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT                    = (1 << 12),
        LWS_SERVER_OPTION_EXPLICIT_VHOSTS                       = (1 << 13),
        LWS_SERVER_OPTION_UNIX_SOCK                             = (1 << 14),
        LWS_SERVER_OPTION_STS                                   = (1 << 15),
        LWS_SERVER_OPTION_IPV6_V6ONLY_MODIFY                    = (1 << 16),
        LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE                     = (1 << 17),
        /****** add new things just above ---^ ******/
};

#define lws_check_opt(c, f) (((c) & (f)) == (f))

struct lws_context_creation_info {
        int port;
        const char *iface;
        const struct lws_protocols *protocols;
        const struct lws_extension *extensions;
        const struct lws_token_limits *token_limits;
        const char *ssl_private_key_password;
        const char *ssl_cert_filepath;
        const char *ssl_private_key_filepath;
        const char *ssl_ca_filepath;
        const char *ssl_cipher_list;
        const char *http_proxy_address;
        unsigned int http_proxy_port;
        int gid;
        int uid;
        unsigned int options;
        void *user;
        int ka_time;
        int ka_probes;
        int ka_interval;
#ifdef LWS_OPENSSL_SUPPORT
        SSL_CTX *provided_client_ssl_ctx;
#else /* maintain structure layout either way */
        void *provided_client_ssl_ctx; 
#endif

        short max_http_header_data;
        short max_http_header_pool;
        unsigned int count_threads;
        unsigned int fd_limit_per_thread;
        unsigned int timeout_secs;
        const char *ecdh_curve;
        const char *vhost_name;
        const char * const *plugin_dirs;
        const struct lws_protocol_vhost_options *pvo;
        int keepalive_timeout;
        const char *log_filepath;
        const struct lws_http_mount *mounts;
        const char *server_string;
        unsigned int pt_serv_buf_size;
        unsigned int max_http_header_data2;
        long ssl_options_set;
        long ssl_options_clear;
        unsigned short ws_ping_pong_interval;
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility
         *
         * The below is to ensure later library versions with new
         * members added above will see 0 (default) even if the app
         * was not built against the newer headers.
         */

        void *_unused[8]; 
};

LWS_VISIBLE LWS_EXTERN struct lws_context *
lws_create_context(struct lws_context_creation_info *info);

LWS_VISIBLE LWS_EXTERN void
lws_context_destroy(struct lws_context *context);

LWS_VISIBLE LWS_EXTERN int
lws_set_proxy(struct lws_vhost *vhost, const char *proxy);


struct lws_vhost;

LWS_EXTERN LWS_VISIBLE struct lws_vhost *
lws_create_vhost(struct lws_context *context,
                 struct lws_context_creation_info *info);

LWS_VISIBLE LWS_EXTERN int
lwsws_get_config_globals(struct lws_context_creation_info *info, const char *d,
                         char **config_strings, int *len);

LWS_VISIBLE LWS_EXTERN int
lwsws_get_config_vhosts(struct lws_context *context,
                        struct lws_context_creation_info *info, const char *d,
                        char **config_strings, int *len);

LWS_VISIBLE LWS_EXTERN struct lws_vhost *
lws_vhost_get(struct lws *wsi) LWS_WARN_DEPRECATED;

LWS_VISIBLE LWS_EXTERN struct lws_vhost *
lws_get_vhost(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int
lws_json_dump_vhost(const struct lws_vhost *vh, char *buf, int len);

LWS_VISIBLE LWS_EXTERN int
lws_json_dump_context(const struct lws_context *context, char *buf, int len);

LWS_VISIBLE LWS_EXTERN void *
lws_context_user(struct lws_context *context);


struct lws_protocol_vhost_options {
        const struct lws_protocol_vhost_options *next; 
        const struct lws_protocol_vhost_options *options; 
        const char *name; 
        const char *value; 
};

enum lws_mount_protocols {
        LWSMPRO_HTTP            = 0, 
        LWSMPRO_HTTPS           = 1, 
        LWSMPRO_FILE            = 2, 
        LWSMPRO_CGI             = 3, 
        LWSMPRO_REDIR_HTTP      = 4, 
        LWSMPRO_REDIR_HTTPS     = 5, 
        LWSMPRO_CALLBACK        = 6, 
};

struct lws_http_mount {
        const struct lws_http_mount *mount_next;
        const char *mountpoint;
        const char *origin;
        const char *def;
        const char *protocol;
        const struct lws_protocol_vhost_options *cgienv;
        const struct lws_protocol_vhost_options *extra_mimetypes;
        const struct lws_protocol_vhost_options *interpret;
        int cgi_timeout;
        int cache_max_age;
        unsigned int auth_mask;
        unsigned int cache_reusable:1; 
        unsigned int cache_revalidate:1; 
        unsigned int cache_intermediaries:1; 
        unsigned char origin_protocol; 
        unsigned char mountpoint_len; 
};


enum lws_client_connect_ssl_connection_flags {
        LCCSCF_USE_SSL                          = (1 << 0),
        LCCSCF_ALLOW_SELFSIGNED                 = (1 << 1),
        LCCSCF_SKIP_SERVER_CERT_HOSTNAME_CHECK  = (1 << 2)
};

struct lws_client_connect_info {
        struct lws_context *context;
        const char *address;
        int port;
        int ssl_connection;
        const char *path;
        const char *host;
        const char *origin;
        const char *protocol;
        int ietf_version_or_minus_one;
        void *userdata;
        const struct lws_extension *client_exts;
        const char *method;
        struct lws *parent_wsi;
        const char *uri_replace_from;
        const char *uri_replace_to;
        struct lws_vhost *vhost;
        struct lws **pwsi;
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility
         *
         * The below is to ensure later library versions with new
         * members added above will see 0 (default) even if the app
         * was not built against the newer headers.
         */

        void *_unused[4]; 
};

LWS_VISIBLE LWS_EXTERN struct lws *
lws_client_connect_via_info(struct lws_client_connect_info * ccinfo);

/* deprecated, use lws_client_connect_via_info() */
LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
lws_client_connect(struct lws_context *clients, const char *address,
                   int port, int ssl_connection, const char *path,
                   const char *host, const char *origin, const char *protocol,
                   int ietf_version_or_minus_one) LWS_WARN_DEPRECATED;
/* deprecated, use lws_client_connect_via_info() */
LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
lws_client_connect_extended(struct lws_context *clients, const char *address,
                            int port, int ssl_connection, const char *path,
                            const char *host, const char *origin,
                            const char *protocol, int ietf_version_or_minus_one,
                            void *userdata) LWS_WARN_DEPRECATED;

LWS_VISIBLE LWS_EXTERN int
lws_init_vhost_client_ssl(const struct lws_context_creation_info *info,
                          struct lws_vhost *vhost);

LWS_VISIBLE LWS_EXTERN int
lws_http_client_read(struct lws *wsi, char **buf, int *len);


LWS_VISIBLE LWS_EXTERN int
lws_service(struct lws_context *context, int timeout_ms);

LWS_VISIBLE LWS_EXTERN int
lws_service_tsi(struct lws_context *context, int timeout_ms, int tsi);

LWS_VISIBLE LWS_EXTERN void
lws_cancel_service_pt(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN void
lws_cancel_service(struct lws_context *context);

LWS_VISIBLE LWS_EXTERN int
lws_service_fd(struct lws_context *context, struct lws_pollfd *pollfd);

LWS_VISIBLE LWS_EXTERN int
lws_service_fd_tsi(struct lws_context *context, struct lws_pollfd *pollfd,
                   int tsi);




LWS_VISIBLE LWS_EXTERN const char *
lws_get_mimetype(const char *file, const struct lws_http_mount *m);

LWS_VISIBLE LWS_EXTERN int
lws_serve_http_file(struct lws *wsi, const char *file, const char *content_type,
                    const char *other_headers, int other_headers_len);
LWS_VISIBLE LWS_EXTERN int
lws_serve_http_file_fragment(struct lws *wsi);


enum http_status {
        HTTP_STATUS_OK                                          = 200,
        HTTP_STATUS_NO_CONTENT                                  = 204,

        HTTP_STATUS_MOVED_PERMANENTLY                           = 301,
        HTTP_STATUS_FOUND                                       = 302,
        HTTP_STATUS_SEE_OTHER                                   = 303,

        HTTP_STATUS_BAD_REQUEST                                 = 400,
        HTTP_STATUS_UNAUTHORIZED,
        HTTP_STATUS_PAYMENT_REQUIRED,
        HTTP_STATUS_FORBIDDEN,
        HTTP_STATUS_NOT_FOUND,
        HTTP_STATUS_METHOD_NOT_ALLOWED,
        HTTP_STATUS_NOT_ACCEPTABLE,
        HTTP_STATUS_PROXY_AUTH_REQUIRED,
        HTTP_STATUS_REQUEST_TIMEOUT,
        HTTP_STATUS_CONFLICT,
        HTTP_STATUS_GONE,
        HTTP_STATUS_LENGTH_REQUIRED,
        HTTP_STATUS_PRECONDITION_FAILED,
        HTTP_STATUS_REQ_ENTITY_TOO_LARGE,
        HTTP_STATUS_REQ_URI_TOO_LONG,
        HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE,
        HTTP_STATUS_REQ_RANGE_NOT_SATISFIABLE,
        HTTP_STATUS_EXPECTATION_FAILED,

        HTTP_STATUS_INTERNAL_SERVER_ERROR                       = 500,
        HTTP_STATUS_NOT_IMPLEMENTED,
        HTTP_STATUS_BAD_GATEWAY,
        HTTP_STATUS_SERVICE_UNAVAILABLE,
        HTTP_STATUS_GATEWAY_TIMEOUT,
        HTTP_STATUS_HTTP_VERSION_NOT_SUPPORTED,
};

struct lws_process_html_args {
        char *p; 
        int len; 
        int max_len; 
        int final; 
};

typedef const char *(*lws_process_html_state_cb)(void *data, int index);

struct lws_process_html_state {
        char *start; 
        char swallow[16]; 
        int pos; 
        void *data; 
        const char * const *vars; 
        int count_vars; 
        lws_process_html_state_cb replace; 
};

LWS_VISIBLE LWS_EXTERN int
lws_chunked_html_process(struct lws_process_html_args *args,
                         struct lws_process_html_state *s);


struct lws_tokens {
        char *token; 
        int token_len; 
};

/* enum lws_token_indexes
 * these have to be kept in sync with lextable.h / minilex.c
 *
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */
enum lws_token_indexes {
        WSI_TOKEN_GET_URI                                       =  0,
        WSI_TOKEN_POST_URI                                      =  1,
        WSI_TOKEN_OPTIONS_URI                                   =  2,
        WSI_TOKEN_HOST                                          =  3,
        WSI_TOKEN_CONNECTION                                    =  4,
        WSI_TOKEN_UPGRADE                                       =  5,
        WSI_TOKEN_ORIGIN                                        =  6,
        WSI_TOKEN_DRAFT                                         =  7,
        WSI_TOKEN_CHALLENGE                                     =  8,
        WSI_TOKEN_EXTENSIONS                                    =  9,
        WSI_TOKEN_KEY1                                          = 10,
        WSI_TOKEN_KEY2                                          = 11,
        WSI_TOKEN_PROTOCOL                                      = 12,
        WSI_TOKEN_ACCEPT                                        = 13,
        WSI_TOKEN_NONCE                                         = 14,
        WSI_TOKEN_HTTP                                          = 15,
        WSI_TOKEN_HTTP2_SETTINGS                                = 16,
        WSI_TOKEN_HTTP_ACCEPT                                   = 17,
        WSI_TOKEN_HTTP_AC_REQUEST_HEADERS                       = 18,
        WSI_TOKEN_HTTP_IF_MODIFIED_SINCE                        = 19,
        WSI_TOKEN_HTTP_IF_NONE_MATCH                            = 20,
        WSI_TOKEN_HTTP_ACCEPT_ENCODING                          = 21,
        WSI_TOKEN_HTTP_ACCEPT_LANGUAGE                          = 22,
        WSI_TOKEN_HTTP_PRAGMA                                   = 23,
        WSI_TOKEN_HTTP_CACHE_CONTROL                            = 24,
        WSI_TOKEN_HTTP_AUTHORIZATION                            = 25,
        WSI_TOKEN_HTTP_COOKIE                                   = 26,
        WSI_TOKEN_HTTP_CONTENT_LENGTH                           = 27,
        WSI_TOKEN_HTTP_CONTENT_TYPE                             = 28,
        WSI_TOKEN_HTTP_DATE                                     = 29,
        WSI_TOKEN_HTTP_RANGE                                    = 30,
        WSI_TOKEN_HTTP_REFERER                                  = 31,
        WSI_TOKEN_KEY                                           = 32,
        WSI_TOKEN_VERSION                                       = 33,
        WSI_TOKEN_SWORIGIN                                      = 34,

        WSI_TOKEN_HTTP_COLON_AUTHORITY                          = 35,
        WSI_TOKEN_HTTP_COLON_METHOD                             = 36,
        WSI_TOKEN_HTTP_COLON_PATH                               = 37,
        WSI_TOKEN_HTTP_COLON_SCHEME                             = 38,
        WSI_TOKEN_HTTP_COLON_STATUS                             = 39,

        WSI_TOKEN_HTTP_ACCEPT_CHARSET                           = 40,
        WSI_TOKEN_HTTP_ACCEPT_RANGES                            = 41,
        WSI_TOKEN_HTTP_ACCESS_CONTROL_ALLOW_ORIGIN              = 42,
        WSI_TOKEN_HTTP_AGE                                      = 43,
        WSI_TOKEN_HTTP_ALLOW                                    = 44,
        WSI_TOKEN_HTTP_CONTENT_DISPOSITION                      = 45,
        WSI_TOKEN_HTTP_CONTENT_ENCODING                         = 46,
        WSI_TOKEN_HTTP_CONTENT_LANGUAGE                         = 47,
        WSI_TOKEN_HTTP_CONTENT_LOCATION                         = 48,
        WSI_TOKEN_HTTP_CONTENT_RANGE                            = 49,
        WSI_TOKEN_HTTP_ETAG                                     = 50,
        WSI_TOKEN_HTTP_EXPECT                                   = 51,
        WSI_TOKEN_HTTP_EXPIRES                                  = 52,
        WSI_TOKEN_HTTP_FROM                                     = 53,
        WSI_TOKEN_HTTP_IF_MATCH                                 = 54,
        WSI_TOKEN_HTTP_IF_RANGE                                 = 55,
        WSI_TOKEN_HTTP_IF_UNMODIFIED_SINCE                      = 56,
        WSI_TOKEN_HTTP_LAST_MODIFIED                            = 57,
        WSI_TOKEN_HTTP_LINK                                     = 58,
        WSI_TOKEN_HTTP_LOCATION                                 = 59,
        WSI_TOKEN_HTTP_MAX_FORWARDS                             = 60,
        WSI_TOKEN_HTTP_PROXY_AUTHENTICATE                       = 61,
        WSI_TOKEN_HTTP_PROXY_AUTHORIZATION                      = 62,
        WSI_TOKEN_HTTP_REFRESH                                  = 63,
        WSI_TOKEN_HTTP_RETRY_AFTER                              = 64,
        WSI_TOKEN_HTTP_SERVER                                   = 65,
        WSI_TOKEN_HTTP_SET_COOKIE                               = 66,
        WSI_TOKEN_HTTP_STRICT_TRANSPORT_SECURITY                = 67,
        WSI_TOKEN_HTTP_TRANSFER_ENCODING                        = 68,
        WSI_TOKEN_HTTP_USER_AGENT                               = 69,
        WSI_TOKEN_HTTP_VARY                                     = 70,
        WSI_TOKEN_HTTP_VIA                                      = 71,
        WSI_TOKEN_HTTP_WWW_AUTHENTICATE                         = 72,

        WSI_TOKEN_PATCH_URI                                     = 73,
        WSI_TOKEN_PUT_URI                                       = 74,
        WSI_TOKEN_DELETE_URI                                    = 75,

        WSI_TOKEN_HTTP_URI_ARGS                                 = 76,
        WSI_TOKEN_PROXY                                         = 77,
        WSI_TOKEN_HTTP_X_REAL_IP                                = 78,
        WSI_TOKEN_HTTP1_0                                       = 79,

        /****** add new things just above ---^ ******/

        /* use token storage to stash these internally, not for
         * user use */

        _WSI_TOKEN_CLIENT_SENT_PROTOCOLS,
        _WSI_TOKEN_CLIENT_PEER_ADDRESS,
        _WSI_TOKEN_CLIENT_URI,
        _WSI_TOKEN_CLIENT_HOST,
        _WSI_TOKEN_CLIENT_ORIGIN,
        _WSI_TOKEN_CLIENT_METHOD,

        /* always last real token index*/
        WSI_TOKEN_COUNT,

        /* parser state additions, no storage associated */
        WSI_TOKEN_NAME_PART,
        WSI_TOKEN_SKIPPING,
        WSI_TOKEN_SKIPPING_SAW_CR,
        WSI_PARSING_COMPLETE,
        WSI_INIT_TOKEN_MUXURL,
};

struct lws_token_limits {
        unsigned short token_limit[WSI_TOKEN_COUNT]; 
};

LWS_VISIBLE LWS_EXTERN const unsigned char *
lws_token_to_string(enum lws_token_indexes token);


LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_hdr_total_length(struct lws *wsi, enum lws_token_indexes h);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_hdr_fragment_length(struct lws *wsi, enum lws_token_indexes h, int frag_idx);

LWS_VISIBLE LWS_EXTERN int
lws_hdr_copy(struct lws *wsi, char *dest, int len, enum lws_token_indexes h);

LWS_VISIBLE LWS_EXTERN int
lws_hdr_copy_fragment(struct lws *wsi, char *dest, int len,
                      enum lws_token_indexes h, int frag_idx);

LWS_VISIBLE LWS_EXTERN const char *
lws_get_urlarg_by_name(struct lws *wsi, const char *name, char *buf, int len);


LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_add_http_header_status(struct lws *wsi,
                           unsigned int code, unsigned char **p,
                           unsigned char *end);
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_add_http_header_by_name(struct lws *wsi, const unsigned char *name,
                            const unsigned char *value, int length,
                            unsigned char **p, unsigned char *end);
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_add_http_header_by_token(struct lws *wsi, enum lws_token_indexes token,
                             const unsigned char *value, int length,
                             unsigned char **p, unsigned char *end);
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_add_http_header_content_length(struct lws *wsi,
                                   unsigned long content_length,
                                   unsigned char **p, unsigned char *end);
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_finalize_http_header(struct lws *wsi, unsigned char **p,
                         unsigned char *end);


enum lws_spa_fileupload_states {
        LWS_UFS_CONTENT,
        LWS_UFS_FINAL_CONTENT,
        LWS_UFS_OPEN
};

typedef int (*lws_spa_fileupload_cb)(void *data, const char *name,
                        const char *filename, char *buf, int len,
                        enum lws_spa_fileupload_states state);

struct lws_spa;

LWS_VISIBLE LWS_EXTERN struct lws_spa *
lws_spa_create(struct lws *wsi, const char * const *param_names,
               int count_params, int max_storage, lws_spa_fileupload_cb opt_cb,
               void *opt_data);

LWS_VISIBLE LWS_EXTERN int
lws_spa_process(struct lws_spa *spa, const char *in, int len);

LWS_VISIBLE LWS_EXTERN int
lws_spa_finalize(struct lws_spa *spa);

LWS_VISIBLE LWS_EXTERN int
lws_spa_get_length(struct lws_spa *spa, int n);

LWS_VISIBLE LWS_EXTERN const char *
lws_spa_get_string(struct lws_spa *spa, int n);

LWS_VISIBLE LWS_EXTERN int
lws_spa_destroy(struct lws_spa *spa);


LWS_VISIBLE LWS_EXTERN const char *
lws_urlencode(char *escaped, const char *string, int len);

/*
 * URLDECODE 1 / 2
 *
 * This simple urldecode only operates until the first '\0' and requires the
 * data to exist all at once
 */
LWS_VISIBLE LWS_EXTERN int
lws_urldecode(char *string, const char *escaped, int len);

LWS_VISIBLE LWS_EXTERN int
lws_return_http_status(struct lws *wsi, unsigned int code,
                       const char *html_body);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_http_redirect(struct lws *wsi, int code, const unsigned char *loc, int len,
                  unsigned char **p, unsigned char *end);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_http_transaction_completed(struct lws *wsi);


LWS_VISIBLE LWS_EXTERN const char *
lws_sql_purify(char *escaped, const char *string, int len);

LWS_VISIBLE LWS_EXTERN const char *
lws_json_purify(char *escaped, const char *string, int len);


#ifdef LWS_USE_LIBEV
typedef void (lws_ev_signal_cb_t)(EV_P_ struct ev_signal *w, int revents);

LWS_VISIBLE LWS_EXTERN int
lws_ev_sigint_cfg(struct lws_context *context, int use_ev_sigint,
                  lws_ev_signal_cb_t *cb);

LWS_VISIBLE LWS_EXTERN int
lws_ev_initloop(struct lws_context *context, struct ev_loop *loop, int tsi);

LWS_VISIBLE LWS_EXTERN void
lws_ev_sigint_cb(struct ev_loop *loop, struct ev_signal *watcher, int revents);
#endif /* LWS_USE_LIBEV */


#ifdef LWS_USE_LIBUV
LWS_VISIBLE LWS_EXTERN int
lws_uv_sigint_cfg(struct lws_context *context, int use_uv_sigint,
                  uv_signal_cb cb);

LWS_VISIBLE LWS_EXTERN void
lws_libuv_run(const struct lws_context *context, int tsi);

LWS_VISIBLE LWS_EXTERN void
lws_libuv_stop(struct lws_context *context);

LWS_VISIBLE LWS_EXTERN int
lws_uv_initloop(struct lws_context *context, uv_loop_t *loop, int tsi);

LWS_VISIBLE LWS_EXTERN uv_loop_t *
lws_uv_getloop(struct lws_context *context, int tsi);

LWS_VISIBLE LWS_EXTERN void
lws_uv_sigint_cb(uv_signal_t *watcher, int signum);
#endif /* LWS_USE_LIBUV */


/*
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */
enum pending_timeout {
        NO_PENDING_TIMEOUT                                      =  0,
        PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE                 =  1,
        PENDING_TIMEOUT_AWAITING_CONNECT_RESPONSE               =  2,
        PENDING_TIMEOUT_ESTABLISH_WITH_SERVER                   =  3,
        PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE                =  4,
        PENDING_TIMEOUT_AWAITING_PING                           =  5,
        PENDING_TIMEOUT_CLOSE_ACK                               =  6,
        PENDING_TIMEOUT_AWAITING_EXTENSION_CONNECT_RESPONSE     =  7,
        PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE                   =  8,
        PENDING_TIMEOUT_SSL_ACCEPT                              =  9,
        PENDING_TIMEOUT_HTTP_CONTENT                            = 10,
        PENDING_TIMEOUT_AWAITING_CLIENT_HS_SEND                 = 11,
        PENDING_FLUSH_STORED_SEND_BEFORE_CLOSE                  = 12,
        PENDING_TIMEOUT_SHUTDOWN_FLUSH                          = 13,
        PENDING_TIMEOUT_CGI                                     = 14,
        PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE                     = 15,
        PENDING_TIMEOUT_WS_PONG_CHECK_SEND_PING                 = 16,
        PENDING_TIMEOUT_WS_PONG_CHECK_GET_PONG                  = 17,

        /****** add new things just above ---^ ******/
};

LWS_VISIBLE LWS_EXTERN void
lws_set_timeout(struct lws *wsi, enum pending_timeout reason, int secs);

#if !defined(LWS_SIZEOFPTR)
#define LWS_SIZEOFPTR (sizeof (void *))
#endif
#if !defined(u_int64_t)
#define u_int64_t unsigned long long
#endif

#if defined(__x86_64__)
#define _LWS_PAD_SIZE 16        /* Intel recommended for best performance */
#else
#define _LWS_PAD_SIZE LWS_SIZEOFPTR   /* Size of a pointer on the target arch */
#endif
#define _LWS_PAD(n) (((n) % _LWS_PAD_SIZE) ? \
                ((n) + (_LWS_PAD_SIZE - ((n) % _LWS_PAD_SIZE))) : (n))
#define LWS_PRE _LWS_PAD(4 + 10)
/* used prior to 1.7 and retained for backward compatibility */
#define LWS_SEND_BUFFER_PRE_PADDING LWS_PRE
#define LWS_SEND_BUFFER_POST_PADDING 0

/*
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */
enum lws_write_protocol {
        LWS_WRITE_TEXT                                          = 0,
        LWS_WRITE_BINARY                                        = 1,
        LWS_WRITE_CONTINUATION                                  = 2,
        LWS_WRITE_HTTP                                          = 3,
        /* LWS_WRITE_CLOSE is handled by lws_close_reason() */
        LWS_WRITE_PING                                          = 5,
        LWS_WRITE_PONG                                          = 6,

        /* Same as write_http but we know this write ends the transaction */
        LWS_WRITE_HTTP_FINAL                                    = 7,

        /* HTTP2 */

        LWS_WRITE_HTTP_HEADERS                                  = 8,
        /****** add new things just above ---^ ******/

        /* flags */

        LWS_WRITE_NO_FIN = 0x40,
        LWS_WRITE_CLIENT_IGNORE_XOR_MASK = 0x80
};


LWS_VISIBLE LWS_EXTERN int
lws_write(struct lws *wsi, unsigned char *buf, size_t len,
          enum lws_write_protocol protocol);

/* helper for case where buffer may be const */
#define lws_write_http(wsi, buf, len) \
        lws_write(wsi, (unsigned char *)(buf), len, LWS_WRITE_HTTP)



LWS_VISIBLE LWS_EXTERN int
lws_callback_on_writable(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int
lws_callback_on_writable_all_protocol(const struct lws_context *context,
                                      const struct lws_protocols *protocol);

LWS_VISIBLE LWS_EXTERN int
lws_callback_on_writable_all_protocol_vhost(const struct lws_vhost *vhost,
                                      const struct lws_protocols *protocol);

LWS_VISIBLE LWS_EXTERN int
lws_callback_all_protocol(struct lws_context *context,
                          const struct lws_protocols *protocol, int reason);

LWS_VISIBLE LWS_EXTERN int
lws_callback_all_protocol_vhost(struct lws_vhost *vh,
                          const struct lws_protocols *protocol, int reason);

LWS_VISIBLE LWS_EXTERN int
lws_callback_vhost_protocols(struct lws *wsi, int reason, void *in, int len);

LWS_VISIBLE LWS_EXTERN int
lws_callback_http_dummy(struct lws *wsi, enum lws_callback_reasons reason,
                    void *user, void *in, size_t len);

LWS_VISIBLE LWS_EXTERN int
lws_get_socket_fd(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN size_t
lws_get_peer_write_allowance(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int
lws_rx_flow_control(struct lws *wsi, int enable);

LWS_VISIBLE LWS_EXTERN void
lws_rx_flow_allow_all_protocol(const struct lws_context *context,
                               const struct lws_protocols *protocol);

LWS_VISIBLE LWS_EXTERN size_t
lws_remaining_packet_payload(struct lws *wsi);



LWS_VISIBLE LWS_EXTERN struct lws *
lws_adopt_socket(struct lws_context *context, lws_sockfd_type accept_fd);
LWS_VISIBLE LWS_EXTERN struct lws *
lws_adopt_socket_readbuf(struct lws_context *context, lws_sockfd_type accept_fd,
                const char *readbuf, size_t len);


LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
lws_canonical_hostname(struct lws_context *context);

LWS_VISIBLE LWS_EXTERN void
lws_get_peer_addresses(struct lws *wsi, lws_sockfd_type fd, char *name,
                       int name_len, char *rip, int rip_len);

LWS_VISIBLE LWS_EXTERN const char *
lws_get_peer_simple(struct lws *wsi, char *name, int namelen);
#ifndef LWS_WITH_ESP8266

LWS_VISIBLE LWS_EXTERN int
lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
                    size_t addrlen);
#endif


LWS_VISIBLE LWS_EXTERN int
lws_get_random(struct lws_context *context, void *buf, int len);
LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_daemonize(const char *_lock_path);
LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
lws_get_library_version(void);

LWS_VISIBLE LWS_EXTERN void *
lws_wsi_user(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_parse_uri(char *p, const char **prot, const char **ads, int *port,
              const char **path);

LWS_VISIBLE LWS_EXTERN unsigned long
lws_now_secs(void);

LWS_VISIBLE LWS_EXTERN struct lws_context * LWS_WARN_UNUSED_RESULT
lws_get_context(const struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_get_count_threads(struct lws_context *context);

LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
lws_get_parent(const struct lws *wsi);

LWS_VISIBLE LWS_EXTERN struct lws * LWS_WARN_UNUSED_RESULT
lws_get_child(const struct lws *wsi);


/*
 * \deprecated DEPRECATED Note: this is not normally needed as a user api.
 * It's provided in case it is
 * useful when integrating with other app poll loop service code.
 */
LWS_VISIBLE LWS_EXTERN int
lws_read(struct lws *wsi, unsigned char *buf, size_t len);

LWS_VISIBLE LWS_EXTERN void
lws_set_allocator(void *(*realloc)(void *ptr, size_t size));


LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_send_pipe_choked(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int
lws_is_final_fragment(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN unsigned char
lws_get_reserved_bits(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_partial_buffered(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_frame_is_binary(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int
lws_is_ssl(struct lws *wsi);
LWS_VISIBLE LWS_EXTERN int
lws_is_cgi(struct lws *wsi);


#ifdef LWS_SHA1_USE_OPENSSL_NAME
#define lws_SHA1 SHA1
#else

LWS_VISIBLE LWS_EXTERN unsigned char *
lws_SHA1(const unsigned char *d, size_t n, unsigned char *md);
#endif

LWS_VISIBLE LWS_EXTERN int
lws_b64_encode_string(const char *in, int in_len, char *out, int out_size);
LWS_VISIBLE LWS_EXTERN int
lws_b64_decode_string(const char *in, char *out, int out_size);


#ifdef LWS_WITH_CGI
enum lws_enum_stdinouterr {
        LWS_STDIN = 0,
        LWS_STDOUT = 1,
        LWS_STDERR = 2,
};

enum lws_cgi_hdr_state {
        LCHS_HEADER,
        LCHS_CR1,
        LCHS_LF1,
        LCHS_CR2,
        LCHS_LF2,
        LHCS_PAYLOAD,
        LCHS_SINGLE_0A,
};

struct lws_cgi_args {
        struct lws **stdwsi; 
        enum lws_enum_stdinouterr ch; 
        unsigned char *data; 
        enum lws_cgi_hdr_state hdr_state; 
        int len; 
};


LWS_VISIBLE LWS_EXTERN int
lws_cgi(struct lws *wsi, const char * const *exec_array,
        int script_uri_path_len, int timeout_secs,
        const struct lws_protocol_vhost_options *mp_cgienv);

LWS_VISIBLE LWS_EXTERN int
lws_cgi_write_split_stdout_headers(struct lws *wsi);

LWS_VISIBLE LWS_EXTERN int
lws_cgi_kill(struct lws *wsi);
#endif



struct lws_plat_file_ops {
        lws_filefd_type (*open)(struct lws *wsi, const char *filename,
                                unsigned long *filelen, int flags);
        int (*close)(struct lws *wsi, lws_filefd_type fd);
        unsigned long (*seek_cur)(struct lws *wsi, lws_filefd_type fd,
                                  long offset_from_cur_pos);
        int (*read)(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
                    unsigned char *buf, unsigned long len);
        int (*write)(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
                     unsigned char *buf, unsigned long len);
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility */
};

LWS_VISIBLE LWS_EXTERN struct lws_plat_file_ops * LWS_WARN_UNUSED_RESULT
lws_get_fops(struct lws_context *context);

static LWS_INLINE lws_filefd_type LWS_WARN_UNUSED_RESULT
lws_plat_file_open(struct lws *wsi, const char *filename,
                   unsigned long *filelen, int flags)
{
        return lws_get_fops(lws_get_context(wsi))->open(wsi, filename,
                                                    filelen, flags);
}

static LWS_INLINE int
lws_plat_file_close(struct lws *wsi, lws_filefd_type fd)
{
        return lws_get_fops(lws_get_context(wsi))->close(wsi, fd);
}

static LWS_INLINE unsigned long
lws_plat_file_seek_cur(struct lws *wsi, lws_filefd_type fd, long offset)
{
        return lws_get_fops(lws_get_context(wsi))->seek_cur(wsi, fd, offset);
}
static LWS_INLINE int LWS_WARN_UNUSED_RESULT
lws_plat_file_read(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
                   unsigned char *buf, unsigned long len)
{
        return lws_get_fops(lws_get_context(wsi))->read(wsi, fd, amount, buf,
                                                        len);
}
static LWS_INLINE int LWS_WARN_UNUSED_RESULT
lws_plat_file_write(struct lws *wsi, lws_filefd_type fd, unsigned long *amount,
                    unsigned char *buf, unsigned long len)
{
        return lws_get_fops(lws_get_context(wsi))->write(wsi, fd, amount, buf,
                                                         len);
}

#ifdef LWS_WITH_SMTP

enum lwsgs_smtp_states {
        LGSSMTP_IDLE, 
        LGSSMTP_CONNECTING, 
        LGSSMTP_CONNECTED, 
        LGSSMTP_SENT_HELO, 
        LGSSMTP_SENT_FROM, 
        LGSSMTP_SENT_TO, 
        LGSSMTP_SENT_DATA, 
        LGSSMTP_SENT_BODY, 
        LGSSMTP_SENT_QUIT, 
};

struct lws_email {
        void *data;
        uv_loop_t *loop;
        char email_smtp_ip[32]; 
        char email_helo[32];    
        char email_from[100];   
        char email_to[100];     
        unsigned int max_content_size;
        /* Fill all the callbacks before init */

        int (*on_next)(struct lws_email *email);
        int (*on_sent)(struct lws_email *email);
        int (*on_get_body)(struct lws_email *email, char *buf, int len);
        /* private things */
        uv_timer_t timeout_email; 
        enum lwsgs_smtp_states estate; 
        uv_connect_t email_connect_req; 
        uv_tcp_t email_client; 
        time_t email_connect_started; 
        char email_buf[256]; 
        char *content; 
};

LWS_VISIBLE LWS_EXTERN int
lws_email_init(struct lws_email *email, uv_loop_t *loop, int max_content);

LWS_VISIBLE LWS_EXTERN void
lws_email_check(struct lws_email *email);
LWS_VISIBLE LWS_EXTERN void
lws_email_destroy(struct lws_email *email);

#endif


#ifdef __cplusplus
}
#endif

#endif