lws-context-vhost.h

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/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2021 Andy Green <andy@warmcat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
/*! \defgroup context-and-vhost context and vhost related functions
 * ##Context and Vhost releated functions
 * \ingroup lwsapi
 *
 *
 *  LWS requires that there is one context, in which you may define multiple
 *  vhosts.  Each vhost is a virtual host, with either its own listen port
 *  or sharing an existing one.  Each vhost has its own SSL context that can
 *  be set up individually or left disabled.
 *
 *  If you don't care about multiple "site" support, you can ignore it and
 *  lws will create a single default vhost at context creation time.
 */
///@{
 
/*
 * 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.
 */
 
 
#define LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT      ((1ll << 1) |
                                                                  (1ll << 12))
        /**< (VH) Don't allow the connection unless the client has a
         * client cert that we recognize; provides
         * LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT */
#define LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME              (1ll << 2)
        /**< (CTX) Don't try to get the server's hostname */
#define LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT              ((1ll << 3) |
                                                                  (1ll << 12))
        /**< (VH) Allow non-SSL (plaintext) connections on the same
         * port as SSL is listening.  If combined with
         * LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS it will try to
         * force http connections on an https listener (eg, http://x.com:443) to
         * redirect to an explicit https connection (eg, https://x.com)
         */
#define LWS_SERVER_OPTION_LIBEV                                  (1ll << 4)
        /**< (CTX) Use libev event loop */
#define LWS_SERVER_OPTION_DISABLE_IPV6                           (1ll << 5)
        /**< (VH) Disable IPV6 support */
#define LWS_SERVER_OPTION_DISABLE_OS_CA_CERTS                    (1ll << 6)
        /**< (VH) Don't load OS CA certs, you will need to load your
         * own CA cert(s) */
#define LWS_SERVER_OPTION_PEER_CERT_NOT_REQUIRED                 (1ll << 7)
        /**< (VH) Accept connections with no valid Cert (eg, selfsigned) */
#define LWS_SERVER_OPTION_VALIDATE_UTF8                          (1ll << 8)
        /**< (VH) Check UT-8 correctness */
#define LWS_SERVER_OPTION_SSL_ECDH                               ((1ll << 9) |
                                                                  (1ll << 12))
        /**< (VH)  initialize ECDH ciphers */
#define LWS_SERVER_OPTION_LIBUV                                 (1ll << 10)
        /**< (CTX)  Use libuv event loop */
#define LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS                ((1ll << 11) |
                                                                 (1ll << 12))
        /**< (VH) Use an http redirect to force the client to ask for https.
         * Notice if your http server issues the STS header and the client has
         * ever seen that, the client will fail the http connection before it
         * can actually do the redirect.
         *
         * Combine with LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS to handle, eg,
         * http://x.com:443 -> https://x.com
         *
         * (deprecated: use mount redirection) */
#define LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT                     (1ll << 12)
        /**< (CTX) Initialize the SSL library at all */
#define LWS_SERVER_OPTION_EXPLICIT_VHOSTS                        (1ll << 13)
        /**< (CTX) Only create the context when calling context
         * create api, implies user code will create its own vhosts */
#define LWS_SERVER_OPTION_UNIX_SOCK                              (1ll << 14)
        /**< (VH) Use Unix socket */
#define LWS_SERVER_OPTION_STS                                    (1ll << 15)
        /**< (VH) Send Strict Transport Security header, making
         * clients subsequently go to https even if user asked for http */
#define LWS_SERVER_OPTION_IPV6_V6ONLY_MODIFY                     (1ll << 16)
        /**< (VH) Enable LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE to take effect */
#define LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE                      (1ll << 17)
        /**< (VH) if set, only ipv6 allowed on the vhost */
#define LWS_SERVER_OPTION_UV_NO_SIGSEGV_SIGFPE_SPIN              (1ll << 18)
        /**< (CTX) Libuv only: Do not spin on SIGSEGV / SIGFPE.  A segfault
         * normally makes the lib spin so you can attach a debugger to it
         * even if it happened without a debugger in place.  You can disable
         * that by giving this option.
         */
#define LWS_SERVER_OPTION_JUST_USE_RAW_ORIGIN                    (1ll << 19)
        /**< For backwards-compatibility reasons, by default
         * lws prepends "http://" to the origin you give in the client
         * connection info struct.  If you give this flag when you create
         * the context, only the string you give in the client connect
         * info for .origin (if any) will be used directly.
         */
#define LWS_SERVER_OPTION_FALLBACK_TO_RAW /* use below name */   (1ll << 20)
#define LWS_SERVER_OPTION_FALLBACK_TO_APPLY_LISTEN_ACCEPT_CONFIG (1ll << 20)
        /**< (VH) if invalid http is coming in the first line, then abandon
         * trying to treat the connection as http, and belatedly apply the
         * .listen_accept_role / .listen_accept_protocol info struct members to
         * the connection.  If they are NULL, for backwards-compatibility the
         * connection is bound to "raw-skt" role, and in order of priority:
         * 1) the vh protocol with a pvo named "raw", 2) the vh protocol with a
         * pvo named "default", or 3) protocols[0].
         *
         * Must be combined with LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT
         * to work with a socket listening with tls.
         */
 
#define LWS_SERVER_OPTION_LIBEVENT                              (1ll << 21)
        /**< (CTX) Use libevent event loop */
 
#define LWS_SERVER_OPTION_ONLY_RAW /* Use below name instead */ (1ll << 22)
#define LWS_SERVER_OPTION_ADOPT_APPLY_LISTEN_ACCEPT_CONFIG      (1ll << 22)
        /**< (VH) All connections to this vhost / port are bound to the
         * role and protocol given in .listen_accept_role /
         * .listen_accept_protocol.
         *
         * If those explicit user-controlled names are NULL, for backwards-
         * compatibility the connection is bound to "raw-skt" role, and in order
         * of priority: 1) the vh protocol with a pvo named "raw", 2) the vh
         * protocol with a pvo named "default", or 3) protocols[0].
         *
         * It's much preferred to specify the role + protocol using the
         * .listen_accept_role and .listen_accept_protocol in the info struct.
         */
#define LWS_SERVER_OPTION_ALLOW_LISTEN_SHARE                    (1ll << 23)
        /**< (VH) Set to allow multiple listen sockets on one interface +
         * address + port.  The default is to strictly allow only one
         * listen socket at a time.  This is automatically selected if you
         * have multiple service threads.  Linux only.
         */
#define LWS_SERVER_OPTION_CREATE_VHOST_SSL_CTX                  (1ll << 24)
        /**< (VH) Force setting up the vhost SSL_CTX, even though the user
         * code doesn't explicitly provide a cert in the info struct.  It
         * implies the user code is going to provide a cert at the
         * LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS callback, which
         * provides the vhost SSL_CTX * in the user parameter.
         */
#define LWS_SERVER_OPTION_SKIP_PROTOCOL_INIT                    (1ll << 25)
        /**< (VH) You probably don't want this.  It forces this vhost to not
         * call LWS_CALLBACK_PROTOCOL_INIT on its protocols.  It's used in the
         * special case of a temporary vhost bound to a single protocol.
         */
#define LWS_SERVER_OPTION_IGNORE_MISSING_CERT                   (1ll << 26)
        /**< (VH) Don't fail if the vhost TLS cert or key are missing, just
         * continue.  The vhost won't be able to serve anything, but if for
         * example the ACME plugin was configured to fetch a cert, this lets
         * you bootstrap your vhost from having no cert to start with.
         */
#define LWS_SERVER_OPTION_VHOST_UPG_STRICT_HOST_CHECK           (1ll << 27)
        /**< (VH) On this vhost, if the connection is being upgraded, insist
         * that there's a Host: header and that the contents match the vhost
         * name + port (443 / 80 are assumed if no :port given based on if the
         * connection is using TLS).
         *
         * By default, without this flag, on upgrade lws just checks that the
         * Host: header was given without checking the contents... this is to
         * allow lax hostname mappings like localhost / 127.0.0.1, and CNAME
         * mappings like www.mysite.com / mysite.com
         */
#define LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE (1ll << 28)
        /**< (VH) Send lws default HTTP headers recommended by Mozilla
         * Observatory for security.  This is a helper option that sends canned
         * headers on each http response enabling a VERY strict Content Security
         * Policy.  The policy is so strict, for example it won't let the page
         * run its own inline JS nor show images or take CSS from a different
         * server.  In many cases your JS only comes from your server as do the
         * image sources and CSS, so that is what you want... attackers hoping
         * to inject JS into your DOM are completely out of luck since even if
         * they succeed, it will be rejected for execution by the browser
         * according to the strict CSP.  In other cases you have to deviate from
         * the complete strictness, in which case don't use this flag: use the
         * .headers member in the vhost init described in struct
         * lws_context_creation_info instead to send the adapted headers
         * yourself.
         */
 
#define LWS_SERVER_OPTION_ALLOW_HTTP_ON_HTTPS_LISTENER           (1ll << 29)
        /**< (VH) If you really want to allow HTTP connections on a tls
         * listener, you can do it with this combined with
         * LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT.  But this is allowing
         * accidental loss of the security assurances provided by tls depending
         * on the client using http when he meant https... it's not
         * recommended.
         */
#define LWS_SERVER_OPTION_FAIL_UPON_UNABLE_TO_BIND               (1ll << 30)
        /**< (VH) When instantiating a new vhost and the specified port is
         * already in use, a null value shall be return to signal the error.
         */
 
#define LWS_SERVER_OPTION_H2_JUST_FIX_WINDOW_UPDATE_OVERFLOW     (1ll << 31)
        /**< (VH) Indicates the connections using this vhost should ignore
         * h2 WINDOW_UPDATE from broken peers and fix them up */
 
#define LWS_SERVER_OPTION_VH_H2_HALF_CLOSED_LONG_POLL            (1ll << 32)
        /**< (VH) Tell the vhost to treat half-closed remote clients as
         * entered into an immortal (ie, not subject to normal timeouts) long
         * poll mode.
         */
 
#define LWS_SERVER_OPTION_GLIB                                   (1ll << 33)
        /**< (CTX) Use glib event loop */
 
#define LWS_SERVER_OPTION_H2_PRIOR_KNOWLEDGE                     (1ll << 34)
        /**< (VH) Tell the vhost to treat plain text http connections as
         * H2 with prior knowledge (no upgrade request involved)
         */
 
#define LWS_SERVER_OPTION_NO_LWS_SYSTEM_STATES                   (1ll << 35)
        /**< (CTX) Disable lws_system state, eg, because we are a secure streams
         * proxy client that is not trying to track system state by itself. */
 
#define LWS_SERVER_OPTION_SS_PROXY                               (1ll << 36)
        /**< (VH) We are being a SS Proxy listen socket for the vhost */
 
#define LWS_SERVER_OPTION_SDEVENT                                (1ll << 37)
        /**< (CTX) Use sd-event loop */
 
#define LWS_SERVER_OPTION_ULOOP                                  (1ll << 38)
        /**< (CTX) Use libubox / uloop event loop */
 
#define LWS_SERVER_OPTION_DISABLE_TLS_SESSION_CACHE              (1ll << 39)
        /**< (VHOST) Disallow use of client tls caching (on by default) */
 
 
        /****** add new things just above ---^ ******/
 
 
#define lws_check_opt(c, f) ((((uint64_t)c) & ((uint64_t)f)) == ((uint64_t)f))
 
struct lws_plat_file_ops;
struct lws_ss_policy;
struct lws_ss_plugin;
struct lws_metric_policy;
struct lws_sss_ops;
 
typedef int (*lws_context_ready_cb_t)(struct lws_context *context);
 
#if defined(LWS_WITH_NETWORK)
typedef int (*lws_peer_limits_notify_t)(struct lws_context *ctx,
                                        lws_sockfd_type sockfd,
                                        lws_sockaddr46 *sa46);
#endif
 
/** struct lws_context_creation_info - parameters to create context and /or vhost with
 *
 * This is also used to create vhosts.... if LWS_SERVER_OPTION_EXPLICIT_VHOSTS
 * is not given, then for backwards compatibility one vhost is created at
 * context-creation time using the info from this struct.
 *
 * If LWS_SERVER_OPTION_EXPLICIT_VHOSTS is given, then no vhosts are created
 * at the same time as the context, they are expected to be created afterwards.
 */
struct lws_context_creation_info {
#if defined(LWS_WITH_NETWORK)
        const char *iface;
        /**< VHOST: NULL to bind the listen socket to all interfaces, or the
         * interface name, eg, "eth2"
         * If options specifies LWS_SERVER_OPTION_UNIX_SOCK, this member is
         * the pathname of a UNIX domain socket. you can use the UNIX domain
         * sockets in abstract namespace, by prepending an at symbol to the
         * socket name. */
        const struct lws_protocols *protocols;
        /**< VHOST: Array of structures listing supported protocols and a
         * protocol-specific callback for each one.  The list is ended with an
         * entry that has a NULL callback pointer.  SEE ALSO .pprotocols below,
         * which gives an alternative way to provide an array of pointers to
         * protocol structs. */
#if defined(LWS_ROLE_WS)
        const struct lws_extension *extensions;
        /**< VHOST: NULL or array of lws_extension structs listing the
         * extensions this context supports. */
#endif
#if defined(LWS_ROLE_H1) || defined(LWS_ROLE_H2)
        const struct lws_token_limits *token_limits;
        /**< CONTEXT: NULL or struct lws_token_limits pointer which is
         * initialized with a token length limit for each possible WSI_TOKEN_ */
        const char *http_proxy_address;
        /**< VHOST: If non-NULL, attempts to proxy via the given address.
         * If proxy auth is required, use format
         * "username:password\@server:port" */
        const struct lws_protocol_vhost_options *headers;
                /**< VHOST: pointer to optional linked list of per-vhost
                 * canned headers that are added to server responses */
 
        const struct lws_protocol_vhost_options *reject_service_keywords;
        /**< CONTEXT: Optional list of keywords and rejection codes + text.
         *
         * The keywords are checked for existing in the user agent string.
         *
         * Eg, "badrobot" "404 Not Found"
         */
        const struct lws_protocol_vhost_options *pvo;
        /**< VHOST: pointer to optional linked list of per-vhost
         * options made accessible to protocols */
        const char *log_filepath;
        /**< VHOST: filepath to append logs to... this is opened before
         *              any dropping of initial privileges */
        const struct lws_http_mount *mounts;
        /**< VHOST: optional linked list of mounts for this vhost */
        const char *server_string;
        /**< CONTEXT: string used in HTTP headers to identify server
         * software, if NULL, "libwebsockets". */
 
        const char *error_document_404;
        /**< VHOST: If non-NULL, when asked to serve a non-existent file,
         *          lws attempts to server this url path instead.  Eg,
         *          "/404.html" */
        int port;
        /**< VHOST: Port to listen on. Use CONTEXT_PORT_NO_LISTEN to suppress
         * listening for a client. Use CONTEXT_PORT_NO_LISTEN_SERVER if you are
         * writing a server but you are using \ref sock-adopt instead of the
         * built-in listener.
         *
         * You can also set port to 0, in which case the kernel will pick
         * a random port that is not already in use.  You can find out what
         * port the vhost is listening on using lws_get_vhost_listen_port() */
 
        unsigned int http_proxy_port;
        /**< VHOST: If http_proxy_address was non-NULL, uses this port */
        unsigned int max_http_header_data2;
        /**< CONTEXT: if max_http_header_data is 0 and this
         * is nonzero, this will be used in place of the default.  It's
         * like this for compatibility with the original short version,
         * this is unsigned int length. */
        unsigned int max_http_header_pool2;
        /**< CONTEXT: if max_http_header_pool is 0 and this
         * is nonzero, this will be used in place of the default.  It's
         * like this for compatibility with the original short version:
         * this is unsigned int length. */
 
        int keepalive_timeout;
        /**< VHOST: (default = 0 = 5s, 31s for http/2) seconds to allow remote
         * client to hold on to an idle HTTP/1.1 connection.  Timeout lifetime
         * applied to idle h2 network connections */
        uint32_t        http2_settings[7];
        /**< VHOST:  if http2_settings[0] is nonzero, the values given in
         *            http2_settings[1]..[6] are used instead of the lws
         *            platform default values.
         *            Just leave all at 0 if you don't care.
         */
 
        unsigned short max_http_header_data;
        /**< CONTEXT: The max amount of header payload that can be handled
         * in an http request (unrecognized header payload is dropped) */
        unsigned short max_http_header_pool;
        /**< CONTEXT: The max number of connections with http headers that
         * can be processed simultaneously (the corresponding memory is
         * allocated and deallocated dynamically as needed).  If the pool is
         * fully busy new incoming connections must wait for accept until one
         * becomes free. 0 = allow as many ah as number of availble fds for
         * the process */
 
#endif
 
#if defined(LWS_WITH_TLS)
        const char *ssl_private_key_password;
        /**< VHOST: NULL or the passphrase needed for the private key. (For
         * backwards compatibility, this can also be used to pass the client
         * cert passphrase when setting up a vhost client SSL context, but it is
         * preferred to use .client_ssl_private_key_password for that.) */
        const char *ssl_cert_filepath;
        /**< VHOST: If libwebsockets was compiled to use ssl, and you want
         * to listen using SSL, set to the filepath to fetch the
         * server cert from, otherwise NULL for unencrypted.  (For backwards
         * compatibility, this can also be used to pass the client certificate
         * when setting up a vhost client SSL context, but it is preferred to
         * use .client_ssl_cert_filepath for that.)
         *
         * Notice you can alternatively set a single DER or PEM from a memory
         * buffer as the vhost tls cert using \p server_ssl_cert_mem and
         * \p server_ssl_cert_mem_len.
         */
        const char *ssl_private_key_filepath;
        /**<  VHOST: filepath to private key if wanting SSL mode;
         * if this is set to NULL but ssl_cert_filepath is set, the
         * OPENSSL_CONTEXT_REQUIRES_PRIVATE_KEY callback is called
         * to allow setting of the private key directly via openSSL
         * library calls.   (For backwards compatibility, this can also be used
         * to pass the client cert private key filepath when setting up a
         * vhost client SSL context, but it is preferred to use
         * .client_ssl_private_key_filepath for that.)
         *
         * Notice you can alternatively set a DER or PEM private key from a
         * memory buffer as the vhost tls private key using
         * \p server_ssl_private_key_mem and \p server_ssl_private_key_mem_len.
         */
        const char *ssl_ca_filepath;
        /**< VHOST: CA certificate filepath or NULL.  (For backwards
         * compatibility, this can also be used to pass the client CA
         * filepath when setting up a vhost client SSL context,
         * but it is preferred to use .client_ssl_ca_filepath for that.)
         *
         * Notice you can alternatively set a DER or PEM CA cert from a memory
         * buffer using \p server_ssl_ca_mem and \p server_ssl_ca_mem_len.
         */
        const char *ssl_cipher_list;
        /**< VHOST: List of valid ciphers to use ON TLS1.2 AND LOWER ONLY (eg,
         * "RC4-MD5:RC4-SHA:AES128-SHA:AES256-SHA:HIGH:!DSS:!aNULL"
         * or you can leave it as NULL to get "DEFAULT" (For backwards
         * compatibility, this can also be used to pass the client cipher
         * list when setting up a vhost client SSL context,
         * but it is preferred to use .client_ssl_cipher_list for that.)
         * SEE .tls1_3_plus_cipher_list and .client_tls_1_3_plus_cipher_list
         * for the equivalent for tls1.3.
         */
        const char *ecdh_curve;
        /**< VHOST: if NULL, defaults to initializing server with
         *   "prime256v1" */
        const char *tls1_3_plus_cipher_list;
        /**< VHOST: List of valid ciphers to use for incoming server connections
         * ON TLS1.3 AND ABOVE (eg, "TLS_CHACHA20_POLY1305_SHA256" on this vhost
         * or you can leave it as NULL to get "DEFAULT".
         * SEE .client_tls_1_3_plus_cipher_list to do the same on the vhost
         * client SSL_CTX.
         */
 
        const void *server_ssl_cert_mem;
        /**< VHOST: Alternative for \p ssl_cert_filepath that allows setting
         * from memory instead of from a file.  At most one of
         * \p ssl_cert_filepath or \p server_ssl_cert_mem should be non-NULL. */
        const void *server_ssl_private_key_mem;
        /**<  VHOST: Alternative for \p ssl_private_key_filepath allowing
         * init from a private key in memory instead of a file.  At most one
         * of \p ssl_private_key_filepath or \p server_ssl_private_key_mem
         * should be non-NULL. */
        const void *server_ssl_ca_mem;
        /**< VHOST: Alternative for \p ssl_ca_filepath allowing
         * init from a CA cert in memory instead of a file.  At most one
         * of \p ssl_ca_filepath or \p server_ssl_ca_mem should be non-NULL. */
 
        long ssl_options_set;
        /**< VHOST: Any bits set here will be set as server SSL options */
        long ssl_options_clear;
        /**< VHOST: Any bits set here will be cleared as server SSL options */
        int simultaneous_ssl_restriction;
        /**< CONTEXT: 0 (no limit) or limit of simultaneous SSL sessions
         * possible.*/
        int simultaneous_ssl_handshake_restriction;
        /**< CONTEXT: 0 (no limit) or limit of simultaneous SSL handshakes ongoing */
        int ssl_info_event_mask;
        /**< VHOST: mask of ssl events to be reported on LWS_CALLBACK_SSL_INFO
         * callback for connections on this vhost.  The mask values are of
         * the form SSL_CB_ALERT, defined in openssl/ssl.h.  The default of
         * 0 means no info events will be reported.
         */
        unsigned int server_ssl_cert_mem_len;
        /**< VHOST: Server SSL context init: length of server_ssl_cert_mem in
         * bytes */
        unsigned int server_ssl_private_key_mem_len;
        /**< VHOST: length of \p server_ssl_private_key_mem in memory */
        unsigned int server_ssl_ca_mem_len;
        /**< VHOST: length of \p server_ssl_ca_mem in memory */
 
        const char *alpn;
        /**< CONTEXT: If non-NULL, default list of advertised alpn, comma-
         *            separated
         *
         *     VHOST: If non-NULL, per-vhost list of advertised alpn, comma-
         *            separated
         */
 
 
#if defined(LWS_WITH_CLIENT)
        const char *client_ssl_private_key_password;
        /**< VHOST: Client SSL context init: NULL or the passphrase needed
         * for the private key */
        const char *client_ssl_cert_filepath;
        /**< VHOST: Client SSL context init: The certificate the client
         * should present to the peer on connection */
        const void *client_ssl_cert_mem;
        /**< VHOST: Client SSL context init: client certificate memory buffer or
         * NULL... use this to load client cert from memory instead of file */
        unsigned int client_ssl_cert_mem_len;
        /**< VHOST: Client SSL context init: length of client_ssl_cert_mem in
         * bytes */
        const char *client_ssl_private_key_filepath;
        /**<  VHOST: Client SSL context init: filepath to client private key
         * if this is set to NULL but client_ssl_cert_filepath is set, you
         * can handle the LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS
         * callback of protocols[0] to allow setting of the private key directly
         * via tls library calls */
        const void *client_ssl_key_mem;
        /**< VHOST: Client SSL context init: client key memory buffer or
         * NULL... use this to load client key from memory instead of file */
        const char *client_ssl_ca_filepath;
        /**< VHOST: Client SSL context init: CA certificate filepath or NULL */
        const void *client_ssl_ca_mem;
        /**< VHOST: Client SSL context init: CA certificate memory buffer or
         * NULL... use this to load CA cert from memory instead of file */
 
        const char *client_ssl_cipher_list;
        /**< VHOST: Client SSL context init: List of valid ciphers to use (eg,
        * "RC4-MD5:RC4-SHA:AES128-SHA:AES256-SHA:HIGH:!DSS:!aNULL"
        * or you can leave it as NULL to get "DEFAULT" */
        const char *client_tls_1_3_plus_cipher_list;
        /**< VHOST: List of valid ciphers to use for outgoing client connections
         * ON TLS1.3 AND ABOVE on this vhost (eg,
         * "TLS_CHACHA20_POLY1305_SHA256") or you can leave it as NULL to get
         * "DEFAULT".
         */
 
        long ssl_client_options_set;
        /**< VHOST: Any bits set here will be set as CLIENT SSL options */
        long ssl_client_options_clear;
        /**< VHOST: Any bits set here will be cleared as CLIENT SSL options */
 
 
        unsigned int client_ssl_ca_mem_len;
        /**< VHOST: Client SSL context init: length of client_ssl_ca_mem in
         * bytes */
        unsigned int client_ssl_key_mem_len;
        /**< VHOST: Client SSL context init: length of client_ssl_key_mem in
         * bytes */
 
#endif
 
#if !defined(LWS_WITH_MBEDTLS)
        SSL_CTX *provided_client_ssl_ctx;
        /**< CONTEXT: If non-null, swap out libwebsockets ssl
          * implementation for the one provided by provided_ssl_ctx.
          * Libwebsockets no longer is responsible for freeing the context
          * if this option is selected. */
#else /* WITH_MBEDTLS */
        const char *mbedtls_client_preload_filepath;
        /**< CONTEXT: If NULL, no effect.  Otherwise it should point to a
         * filepath where every created client SSL_CTX is preloaded from the
         * system trust bundle.
         *
         * This sets a processwide variable that affects all contexts.
         *
         * Requires that the mbedtls provides mbedtls_x509_crt_parse_file(),
         * else disabled.
         */
#endif
#endif
 
        int ka_time;
        /**< CONTEXT: 0 for no TCP keepalive, otherwise apply this keepalive
         * timeout to all libwebsocket sockets, client or server */
        int ka_probes;
        /**< CONTEXT: if ka_time was nonzero, after the timeout expires how many
         * times to try to get a response from the peer before giving up
         * and killing the connection */
        int ka_interval;
        /**< CONTEXT: if ka_time was nonzero, how long to wait before each ka_probes
         * attempt */
        unsigned int timeout_secs;
        /**< VHOST: various processes involving network roundtrips in the
         * library are protected from hanging forever by timeouts.  If
         * nonzero, this member lets you set the timeout used in seconds.
         * Otherwise a default timeout is used. */
        unsigned int connect_timeout_secs;
        /**< VHOST: client connections have this long to find a working server
         * from the DNS results, or the whole connection times out.  If zero,
         * a default timeout is used */
        int bind_iface;
        /**< VHOST: nonzero to strictly bind sockets to the interface name in
         * .iface (eg, "eth2"), using SO_BIND_TO_DEVICE.
         *
         * Requires SO_BINDTODEVICE support from your OS and CAP_NET_RAW
         * capability.
         *
         * Notice that common things like access network interface IP from
         * your local machine use your lo / loopback interface and will be
         * disallowed by this.
         */
        unsigned int timeout_secs_ah_idle;
        /**< VHOST: seconds to allow a client to hold an ah without using it.
         * 0 defaults to 10s. */
#endif /* WITH_NETWORK */
 
#if defined(LWS_WITH_TLS_SESSIONS)
        uint32_t                        tls_session_timeout;
        /**< VHOST: seconds until timeout/ttl for newly created sessions.
         * 0 means default timeout (defined per protocol, usually 300s). */
        uint32_t                        tls_session_cache_max;
        /**< VHOST: 0 for default limit of 10, or the maximum number of
         * client tls sessions we are willing to cache */
#endif
 
        gid_t gid;
        /**< CONTEXT: group id to change to after setting listen socket,
         *   or -1. See also .username below. */
        uid_t uid;
        /**< CONTEXT: user id to change to after setting listen socket,
         *   or -1.  See also .groupname below. */
        uint64_t options;
        /**< VHOST + CONTEXT: 0, or LWS_SERVER_OPTION_... bitfields */
        void *user;
        /**< VHOST + CONTEXT: optional user pointer that will be associated
         * with the context when creating the context (and can be retrieved by
         * lws_context_user(context), or with the vhost when creating the vhost
         * (and can be retrieved by lws_vhost_user(vhost)).  You will need to
         * use LWS_SERVER_OPTION_EXPLICIT_VHOSTS and create the vhost separately
         * if you care about giving the context and vhost different user pointer
         * values.
         */
        unsigned int count_threads;
        /**< CONTEXT: how many contexts to create in an array, 0 = 1 */
        unsigned int fd_limit_per_thread;
        /**< CONTEXT: nonzero means restrict each service thread to this
         * many fds, 0 means the default which is divide the process fd
         * limit by the number of threads.
         *
         * Note if this is nonzero, and fd_limit_per_thread multiplied by the
         * number of service threads is less than the process ulimit, then lws
         * restricts internal lookup table allocation to the smaller size, and
         * switches to a less efficient lookup scheme.  You should use this to
         * trade off speed against memory usage if you know the lws context
         * will only use a handful of fds.
         *
         * Bear in mind lws may use some fds internally, for example for the
         * cancel pipe, so you may need to allow for some extras for normal
         * operation.
         */
        const char *vhost_name;
        /**< VHOST: name of vhost, must match external DNS name used to
         * access the site, like "warmcat.com" as it's used to match
         * Host: header and / or SNI name for SSL.
         * CONTEXT: NULL, or the name to associate with the context for
         * context-specific logging
         */
#if defined(LWS_WITH_PLUGINS)
        const char * const *plugin_dirs;
        /**< CONTEXT: NULL, or NULL-terminated array of directories to
         * scan for lws protocol plugins at context creation time */
#endif
        void *external_baggage_free_on_destroy;
        /**< CONTEXT: NULL, or pointer to something externally malloc'd, that
         * should be freed when the context is destroyed.  This allows you to
         * automatically sync the freeing action to the context destruction
         * action, so there is no need for an external free() if the context
         * succeeded to create.
         */
 
 
        unsigned int pt_serv_buf_size;
        /**< CONTEXT: 0 = default of 4096.  This buffer is used by
         * various service related features including file serving, it
         * defines the max chunk of file that can be sent at once.
         * At the risk of lws having to buffer failed large sends, it
         * can be increased to, eg, 128KiB to improve throughput. */
#if defined(LWS_WITH_FILE_OPS)
        const struct lws_plat_file_ops *fops;
        /**< CONTEXT: NULL, or pointer to an array of fops structs, terminated
         * by a sentinel with NULL .open.
         *
         * If NULL, lws provides just the platform file operations struct for
         * backwards compatibility.
         */
#endif
 
#if defined(LWS_WITH_SOCKS5)
        const char *socks_proxy_address;
        /**< VHOST: If non-NULL, attempts to proxy via the given address.
         * If proxy auth is required, use format
         * "username:password\@server:port" */
        unsigned int socks_proxy_port;
        /**< VHOST: If socks_proxy_address was non-NULL, uses this port
         * if nonzero, otherwise requires "server:port" in .socks_proxy_address
         */
#endif
 
#if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
        cap_value_t caps[4];
        /**< CONTEXT: array holding Linux capabilities you want to
         * continue to be available to the server after it transitions
         * to a noprivileged user.  Usually none are needed but for, eg,
         * .bind_iface, CAP_NET_RAW is required.  This gives you a way
         * to still have the capability but drop root.
         */
        char count_caps;
        /**< CONTEXT: count of Linux capabilities in .caps[].  0 means
         * no capabilities will be inherited from root (the default) */
#endif
        void **foreign_loops;
        /**< CONTEXT: This is ignored if the context is not being started with
         *              an event loop, ie, .options has a flag like
         *              LWS_SERVER_OPTION_LIBUV.
         *
         *              NULL indicates lws should start its own even loop for
         *              each service thread, and deal with closing the loops
         *              when the context is destroyed.
         *
         *              Non-NULL means it points to an array of external
         *              ("foreign") event loops that are to be used in turn for
         *              each service thread.  In the default case of 1 service
         *              thread, it can just point to one foreign event loop.
         */
        void (*signal_cb)(void *event_lib_handle, int signum);
        /**< CONTEXT: NULL: default signal handling.  Otherwise this receives
         *              the signal handler callback.  event_lib_handle is the
         *              native event library signal handle, eg uv_signal_t *
         *              for libuv.
         */
        struct lws_context **pcontext;
        /**< CONTEXT: if non-NULL, at the end of context destroy processing,
         * the pointer pointed to by pcontext is written with NULL.  You can
         * use this to let foreign event loops know that lws context destruction
         * is fully completed.
         */
        void (*finalize)(struct lws_vhost *vh, void *arg);
        /**< VHOST: NULL, or pointer to function that will be called back
         *          when the vhost is just about to be freed.  The arg parameter
         *          will be set to whatever finalize_arg is below.
         */
        void *finalize_arg;
        /**< VHOST: opaque pointer lws ignores but passes to the finalize
         *          callback.  If you don't care, leave it NULL.
         */
        const char *listen_accept_role;
        /**< VHOST: NULL for default, or force accepted incoming connections to
         * bind to this role.  Uses the role names from their ops struct, eg,
         * "raw-skt".
         */
        const char *listen_accept_protocol;
        /**< VHOST: NULL for default, or force accepted incoming connections to
         * bind to this vhost protocol name.
         */
        const struct lws_protocols **pprotocols;
        /**< VHOST: NULL: use .protocols, otherwise ignore .protocols and use
         * this array of pointers to protocols structs.  The end of the array
         * is marked by a NULL pointer.
         *
         * This is preferred over .protocols, because it allows the protocol
         * struct to be opaquely defined elsewhere, with just a pointer to it
         * needed to create the context with it.  .protocols requires also
         * the type of the user data to be known so its size can be given.
         */
 
        const char *username; /**< CONTEXT: string username for post-init
         * permissions.  Like .uid but takes a string username. */
        const char *groupname; /**< CONTEXT: string groupname for post-init
         * permissions.  Like .gid but takes a string groupname. */
        const char *unix_socket_perms; /**< VHOST: if your vhost is listening
         * on a unix socket, you can give a "username:groupname" string here
         * to control the owner:group it's created with.  It's always created
         * with 0660 mode. */
        const lws_system_ops_t *system_ops;
        /**< CONTEXT: hook up lws_system_ apis to system-specific
         * implementations */
        const lws_retry_bo_t *retry_and_idle_policy;
        /**< VHOST: optional retry and idle policy to apply to this vhost.
         *   Currently only the idle parts are applied to the connections.
         */
#if defined(LWS_WITH_SYS_STATE)
        lws_state_notify_link_t * const *register_notifier_list;
        /**< CONTEXT: NULL, or pointer to an array of notifiers that should
         * be registered during context creation, so they can see state change
         * events from very early on.  The array should end with a NULL. */
#endif
#if defined(LWS_WITH_SECURE_STREAMS)
#if defined(LWS_WITH_SECURE_STREAMS_STATIC_POLICY_ONLY)
        const struct lws_ss_policy *pss_policies; /**< CONTEXT: point to first
         * in a linked-list of streamtype policies prepared by user code */
#else
        const char *pss_policies_json; /**< CONTEXT: point to a string
         * containing a JSON description of the secure streams policies.  Set
         * to NULL if not using Secure Streams.
         * If the platform supports files and the string does not begin with
         * '{', lws treats the string as a filepath to open to get the JSON
         * policy.
         */
#endif
        const struct lws_ss_plugin **pss_plugins; /**< CONTEXT: point to an array
         * of pointers to plugin structs here, terminated with a NULL ptr.
         * Set to NULL if not using Secure Streams. */
        const char *ss_proxy_bind; /**< CONTEXT: NULL, or: ss_proxy_port == 0:
         * point to a string giving the Unix Domain Socket address to use (start
         * with @ for abstract namespace), ss_proxy_port nonzero: set the
         * network interface address (not name, it's ambiguous for ipv4/6) to
         * bind the tcp connection to the proxy to */
        const char *ss_proxy_address; /**< CONTEXT: NULL, or if ss_proxy_port
         * nonzero: the tcp address of the ss proxy to connect to */
        uint16_t ss_proxy_port; /* 0 = if connecting to ss proxy, do it via a
         * Unix Domain Socket, "+@proxy.ss.lws" if ss_proxy_bind is NULL else
         * the socket path given in ss_proxy_bind (start it with a + or +@);
         * nonzero means connect via a tcp socket to the tcp address in
         * ss_proxy_bind and the given port */
        const struct lws_transport_proxy_ops *txp_ops_ssproxy; /**< CONTEXT: NULL, or
         * custom sss transport ops used for ss proxy communication.  NULL means
         * to use the default wsi-based proxy server */
        const void *txp_ssproxy_info; /**< CONTEXT: NULL, or extra transport-
         * specifi creation info to be used at \p txp_ops_ssproxy creation */
        const struct lws_transport_client_ops *txp_ops_sspc; /**< CONTEXT: NULL, or
         * custom sss transport ops used for ss client communication to the ss
         * proxy.  NULL means to use the default wsi-based client support */
#endif
 
#if defined(LWS_WITH_SECURE_STREAMS_PROXY_API)
#endif
 
        int rlimit_nofile;
        /**< 0 = inherit the initial ulimit for files / sockets from the startup
         * environment.  Nonzero = try to set the limit for this process.
         */
#if defined(LWS_WITH_PEER_LIMITS)
        lws_peer_limits_notify_t pl_notify_cb;
        /**< CONTEXT: NULL, or a callback to receive notifications each time a
         * connection is being dropped because of peer limits.
         *
         * The callback provides the context, and an lws_sockaddr46 with the
         * peer address and port.
         */
        unsigned short ip_limit_ah;
        /**< CONTEXT: max number of ah a single IP may use simultaneously
         *            0 is no limit. This is a soft limit: if the limit is
         *            reached, connections from that IP will wait in the ah
         *            waiting list and not be able to acquire an ah until
         *            a connection belonging to the IP relinquishes one it
         *            already has.
         */
        unsigned short ip_limit_wsi;
        /**< CONTEXT: max number of wsi a single IP may use simultaneously.
         *            0 is no limit.  This is a hard limit, connections from
         *            the same IP will simply be dropped once it acquires the
         *            amount of simultaneous wsi / accepted connections
         *            given here.
         */
 
#endif /* PEER_LIMITS */
 
#if defined(LWS_WITH_SYS_FAULT_INJECTION)
        lws_fi_ctx_t                            fic;
        /**< CONTEXT | VHOST: attach external Fault Injection context to the
         * lws_context or vhost.  If creating the context + default vhost in
         * one step, only the context binds to \p fi.  When creating a vhost
         * otherwise this can bind to the vhost so the faults can be injected
         * from the start.
         */
#endif
 
#if defined(LWS_WITH_SYS_SMD)
        lws_smd_notification_cb_t               early_smd_cb;
        /**< CONTEXT: NULL, or an smd notification callback that will be registered
         * immediately after the smd in the context is initialized.  This ensures
         * you can get all notifications without having to intercept the event loop
         * creation, eg, when using an event library.  Other callbacks can be
         * registered later manually without problems.
         */
        void                                    *early_smd_opaque;
        lws_smd_class_t                         early_smd_class_filter;
        lws_usec_t                              smd_ttl_us;
        /**< CONTEXT: SMD messages older than this many us are removed from the
         * queue and destroyed even if not fully delivered yet.  If zero,
         * defaults to 2 seconds (5 second for FREERTOS).
         */
        uint16_t                                smd_queue_depth;
        /**< CONTEXT: Maximum queue depth, If zero defaults to 40
         * (20 for FREERTOS) */
#endif
 
#if defined(LWS_WITH_SYS_METRICS)
        const struct lws_metric_policy          *metrics_policies;
        /**< CONTEXT: non-SS policy metrics policies */
        const char                              *metrics_prefix;
        /**< CONTEXT: prefix for this context's metrics, used to distinguish
         * metrics pooled from different processes / applications, so, eg what
         * would be "cpu.svc" if this is NULL becomes "myapp.cpu.svc" is this is
         * set to "myapp".  Policies are applied using the name with the prefix,
         * if present.
         */
#endif
 
        int                                     fo_listen_queue;
        /**< VHOST: 0 = no TCP_FASTOPEN, nonzero = enable TCP_FASTOPEN if the
         * platform supports it, with the given queue length for the listen
         * socket.
         */
 
        const struct lws_plugin_evlib           *event_lib_custom;
        /**< CONTEXT: If non-NULL, override event library selection so it uses
         * this custom event library implementation, instead of default internal
         * loop.  Don't set any other event lib context creation flags in that
         * case. it will be used automatically.  This is useful for integration
         * where an existing application is using its own handrolled event loop
         * instead of an event library, it provides a way to allow lws to use
         * the custom event loop natively as if it were an "event library".
         */
 
#if defined(LWS_WITH_TLS_JIT_TRUST)
        size_t                                  jitt_cache_max_footprint;
        /**< CONTEXT: 0 for no limit, else max bytes used by JIT Trust cache...
         * LRU items are evicted to keep under this limit */
        int                                     vh_idle_grace_ms;
        /**< CONTEXT: 0 for default of 5000ms, or number of ms JIT Trust vhosts
         * are allowed to live without active connections using them. */
#endif
 
        lws_log_cx_t                            *log_cx;
        /**< CONTEXT: NULL to use the default, process-scope logging context,
         * else a specific logging context to associate with this context */
 
#if defined(LWS_WITH_CACHE_NSCOOKIEJAR) && defined(LWS_WITH_CLIENT)
        const char                              *http_nsc_filepath;
        /**< CONTEXT: Filepath to use for http netscape cookiejar file */
 
        size_t                                  http_nsc_heap_max_footprint;
        /**< CONTEXT: 0, or limit in bytes for heap usage of memory cookie
         * cache */
        size_t                                  http_nsc_heap_max_items;
        /**< CONTEXT: 0, or the max number of items allowed in the cookie cache
         * before destroying lru items to keep it under the limit */
        size_t                                  http_nsc_heap_max_payload;
        /**< CONTEXT: 0, or the maximum size of a single cookie we are able to
         * handle */
#endif
 
#if defined(LWS_WITH_SYS_ASYNC_DNS)
        const char                              **async_dns_servers;
        /**< CONTEXT: NULL, or a pointer to an array of strings containing the
         * numeric IP like "8.8.8.8" or "2001:4860:4860::8888" for a list of DNS
         * server to forcibly add.  If given, the list of strings must be
         * terminated with a NULL.
         */
#endif
 
        /* 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[2]; /**< dummy */
};
 
/**
 * lws_create_context() - Create the websocket handler
 * \param info: pointer to struct with parameters
 *
 *      This function creates the listening socket (if serving) and takes care
 *      of all initialization in one step.
 *
 *      If option LWS_SERVER_OPTION_EXPLICIT_VHOSTS is given, no vhost is
 *      created; you're expected to create your own vhosts afterwards using
 *      lws_create_vhost().  Otherwise a vhost named "default" is also created
 *      using the information in the vhost-related members, for compatibility.
 *
 *      After initialization, it returns a struct lws_context * that
 *      represents this server.  After calling, user code needs to take care
 *      of calling lws_service() with the context pointer to get the
 *      server's sockets serviced.  This must be done in the same process
 *      context as the initialization call.
 *
 *      The protocol callback functions are called for a handful of events
 *      including http requests coming in, websocket connections becoming
 *      established, and data arriving; it's also called periodically to allow
 *      async transmission.
 *
 *      HTTP requests are sent always to the FIRST protocol in protocol, since
 *      at that time websocket protocol has not been negotiated.  Other
 *      protocols after the first one never see any HTTP callback activity.
 *
 *      The server created is a simple http server by default; part of the
 *      websocket standard is upgrading this http connection to a websocket one.
 *
 *      This allows the same server to provide files like scripts and favicon /
 *      images or whatever over http and dynamic data over websockets all in
 *      one place; they're all handled in the user callback.
 */
LWS_VISIBLE LWS_EXTERN struct lws_context *
lws_create_context(const struct lws_context_creation_info *info);
 
 
/**
 * lws_context_destroy() - Destroy the websocket context
 * \param context:      Websocket context
 *
 *      This function closes any active connections and then frees the
 *      context.  After calling this, any further use of the context is
 *      undefined.
 */
LWS_VISIBLE LWS_EXTERN void
lws_context_destroy(struct lws_context *context);
 
typedef int (*lws_reload_func)(void);
 
/**
 * lws_context_deprecate() - Deprecate the websocket context
 *
 * \param context:      Websocket context
 * \param cb: Callback notified when old context listen sockets are closed
 *
 *      This function is used on an existing context before superceding it
 *      with a new context.
 *
 *      It closes any listen sockets in the context, so new connections are
 *      not possible.
 *
 *      And it marks the context to be deleted when the number of active
 *      connections into it falls to zero.
 *
 *      This is aimed at allowing seamless configuration reloads.
 *
 *      The callback cb will be called after the listen sockets are actually
 *      closed and may be reopened.  In the callback the new context should be
 *      configured and created.  (With libuv, socket close happens async after
 *      more loop events).
 */
LWS_VISIBLE LWS_EXTERN void
lws_context_deprecate(struct lws_context *context, lws_reload_func cb);
 
LWS_VISIBLE LWS_EXTERN int
lws_context_is_deprecated(struct lws_context *context);
 
/**
 * lws_set_proxy() - Setups proxy to lws_context.
 * \param vhost:        pointer to struct lws_vhost you want set proxy for
 * \param proxy: pointer to c string containing proxy in format address:port
 *
 * Returns 0 if proxy string was parsed and proxy was setup.
 * Returns -1 if proxy is NULL or has incorrect format.
 *
 * This is only required if your OS does not provide the http_proxy
 * environment variable (eg, OSX)
 *
 *   IMPORTANT! You should call this function right after creation of the
 *   lws_context and before call to connect. If you call this
 *   function after connect behavior is undefined.
 *   This function will override proxy settings made on lws_context
 *   creation with genenv() call.
 */
LWS_VISIBLE LWS_EXTERN int
lws_set_proxy(struct lws_vhost *vhost, const char *proxy);
 
/**
 * lws_set_socks() - Setup socks to lws_context.
 * \param vhost:        pointer to struct lws_vhost you want set socks for
 * \param socks: pointer to c string containing socks in format address:port
 *
 * Returns 0 if socks string was parsed and socks was setup.
 * Returns -1 if socks is NULL or has incorrect format.
 *
 * This is only required if your OS does not provide the socks_proxy
 * environment variable (eg, OSX)
 *
 *   IMPORTANT! You should call this function right after creation of the
 *   lws_context and before call to connect. If you call this
 *   function after connect behavior is undefined.
 *   This function will override proxy settings made on lws_context
 *   creation with genenv() call.
 */
LWS_VISIBLE LWS_EXTERN int
lws_set_socks(struct lws_vhost *vhost, const char *socks);
 
struct lws_vhost;
 
/**
 * lws_create_vhost() - Create a vhost (virtual server context)
 * \param context:      pointer to result of lws_create_context()
 * \param info:         pointer to struct with parameters
 *
 * This function creates a virtual server (vhost) using the vhost-related
 * members of the info struct.  You can create many vhosts inside one context
 * if you created the context with the option LWS_SERVER_OPTION_EXPLICIT_VHOSTS
 */
LWS_VISIBLE LWS_EXTERN struct lws_vhost *
lws_create_vhost(struct lws_context *context,
                 const struct lws_context_creation_info *info);
 
/**
 * lws_vhost_destroy() - Destroy a vhost (virtual server context)
 *
 * \param vh:           pointer to result of lws_create_vhost()
 *
 * This function destroys a vhost.  Normally, if you just want to exit,
 * then lws_destroy_context() will take care of everything.  If you want
 * to destroy an individual vhost and all connections and allocations, you
 * can do it with this.
 *
 * If the vhost has a listen sockets shared by other vhosts, it will be given
 * to one of the vhosts sharing it rather than closed.
 *
 * The vhost close is staged according to the needs of the event loop, and if
 * there are multiple service threads.  At the point the vhost itself if
 * about to be freed, if you provided a finalize callback and optional arg at
 * vhost creation time, it will be called just before the vhost is freed.
 */
LWS_VISIBLE LWS_EXTERN void
lws_vhost_destroy(struct lws_vhost *vh);
 
/**
 * lwsws_get_config_globals() - Parse a JSON server config file
 * \param info:         pointer to struct with parameters
 * \param d:            filepath of the config file
 * \param config_strings: storage for the config strings extracted from JSON,
 *                        the pointer is incremented as strings are stored
 * \param len:          pointer to the remaining length left in config_strings
 *                        the value is decremented as strings are stored
 *
 * This function prepares a n lws_context_creation_info struct with global
 * settings from a file d.
 *
 * Requires CMake option LWS_WITH_LEJP_CONF to have been enabled
 */
LWS_VISIBLE LWS_EXTERN int
lwsws_get_config_globals(struct lws_context_creation_info *info, const char *d,
                         char **config_strings, int *len);
 
/**
 * lwsws_get_config_vhosts() - Create vhosts from a JSON server config file
 * \param context:      pointer to result of lws_create_context()
 * \param info:         pointer to struct with parameters
 * \param d:            filepath of the config file
 * \param config_strings: storage for the config strings extracted from JSON,
 *                        the pointer is incremented as strings are stored
 * \param len:          pointer to the remaining length left in config_strings
 *                        the value is decremented as strings are stored
 *
 * This function creates vhosts into a context according to the settings in
 *JSON files found in directory d.
 *
 * Requires CMake option LWS_WITH_LEJP_CONF to have been enabled
 */
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_get_vhost() - return the vhost a wsi belongs to
 *
 * \param wsi: which connection
 */
LWS_VISIBLE LWS_EXTERN struct lws_vhost *
lws_get_vhost(struct lws *wsi);
 
/**
 * lws_get_vhost_name() - returns the name of a vhost
 *
 * \param vhost: which vhost
 */
LWS_VISIBLE LWS_EXTERN const char *
lws_get_vhost_name(struct lws_vhost *vhost);
 
/**
 * lws_get_vhost_by_name() - returns the vhost with the requested name, or NULL
 *
 * \param context: the lws_context to look in
 * \param name: vhost name we are looking for
 *
 * Returns NULL, or the vhost with the name \p name
 */
LWS_VISIBLE LWS_EXTERN struct lws_vhost *
lws_get_vhost_by_name(struct lws_context *context, const char *name);
 
/**
 * lws_get_vhost_port() - returns the port a vhost listens on, or -1
 *
 * \param vhost: which vhost
 */
LWS_VISIBLE LWS_EXTERN int
lws_get_vhost_port(struct lws_vhost *vhost);
 
/**
 * lws_get_vhost_user() - returns the user pointer for the vhost
 *
 * \param vhost: which vhost
 */
LWS_VISIBLE LWS_EXTERN void *
lws_get_vhost_user(struct lws_vhost *vhost);
 
/**
 * lws_get_vhost_iface() - returns the binding for the vhost listen socket
 *
 * \param vhost: which vhost
 */
LWS_VISIBLE LWS_EXTERN const char *
lws_get_vhost_iface(struct lws_vhost *vhost);
 
/**
 * lws_vhost_user() - get the user data associated with the vhost
 * \param vhost: Websocket vhost
 *
 * This returns the optional user pointer that can be attached to
 * a vhost when it was created.  Lws never dereferences this pointer, it only
 * sets it when the vhost is created, and returns it using this api.
 */
LWS_VISIBLE LWS_EXTERN void *
lws_vhost_user(struct lws_vhost *vhost);
 
/**
 * lws_context_user() - get the user data associated with the context
 * \param context: Websocket context
 *
 * This returns the optional user allocation that can be attached to
 * the context the sockets live in at context_create time.  It's a way
 * to let all sockets serviced in the same context share data without
 * using globals statics in the user code.
 */
LWS_VISIBLE LWS_EXTERN void *
lws_context_user(struct lws_context *context);
 
LWS_VISIBLE LWS_EXTERN const char *
lws_vh_tag(struct lws_vhost *vh);
 
LWS_VISIBLE LWS_EXTERN void
_lws_context_info_defaults(struct lws_context_creation_info *info,
                           const char *sspol);
 
LWS_VISIBLE LWS_EXTERN void
lws_default_loop_exit(struct lws_context *cx);
 
LWS_VISIBLE LWS_EXTERN void
lws_context_default_loop_run_destroy(struct lws_context *cx);
 
LWS_VISIBLE LWS_EXTERN int
lws_cmdline_passfail(int argc, const char **argv, int actual);
 
/**
 * lws_context_is_being_destroyed() - find out if context is being destroyed
 *
 * \param context: the struct lws_context pointer
 *
 * Returns nonzero if the context has had lws_context_destroy() called on it...
 * when using event library loops the destroy process can be asynchronous.  In
 * the special case of libuv foreign loops, the failure to create the context
 * may have to do work on the foreign loop to reverse the partial creation,
 * meaning a failed context create cannot unpick what it did and return NULL.
 *
 * In that condition, a valid context that is already started the destroy
 * process is returned, and this test api will return nonzero as a way to
 * find out the create is in the middle of failing.
 */
LWS_VISIBLE LWS_EXTERN int
lws_context_is_being_destroyed(struct lws_context *context);
 
/*! \defgroup vhost-mounts Vhost mounts and options
 * \ingroup context-and-vhost-creation
 *
 * ##Vhost mounts and options
 */
///@{
/** struct lws_protocol_vhost_options - linked list of per-vhost protocol
 *                                      name=value options
 *
 * This provides a general way to attach a linked-list of name=value pairs,
 * which can also have an optional child link-list using the options member.
 */
struct lws_protocol_vhost_options {
        const struct lws_protocol_vhost_options *next; /**< linked list */
        const struct lws_protocol_vhost_options *options; /**< child linked-list of more options for this node */
        const char *name; /**< name of name=value pair */
        const char *value; /**< value of name=value pair */
};
 
/** enum lws_mount_protocols
 * This specifies the mount protocol for a mountpoint, whether it is to be
 * served from a filesystem, or it is a cgi etc.
 */
enum lws_mount_protocols {
        LWSMPRO_HTTP            = 0, /**< http reverse proxy */
        LWSMPRO_HTTPS           = 1, /**< https reverse proxy */
        LWSMPRO_FILE            = 2, /**< serve from filesystem directory */
        LWSMPRO_CGI             = 3, /**< pass to CGI to handle */
        LWSMPRO_REDIR_HTTP      = 4, /**< redirect to http:// url */
        LWSMPRO_REDIR_HTTPS     = 5, /**< redirect to https:// url */
        LWSMPRO_CALLBACK        = 6, /**< hand by named protocol's callback */
};
 
/** enum lws_authentication_mode
 * This specifies the authentication mode of the mount. The basic_auth_login_file mount parameter
 * is ignored unless LWSAUTHM_DEFAULT is set.
 */
enum lws_authentication_mode {
        LWSAUTHM_DEFAULT = 0, /**< default authenticate only if basic_auth_login_file is provided */
        LWSAUTHM_BASIC_AUTH_CALLBACK = 1 << 28 /**< Basic auth with a custom verifier */
};
 
/** The authentication mode is stored in the top 4 bits of lws_http_mount.auth_mask */
#define AUTH_MODE_MASK 0xF0000000
 
/** struct lws_http_mount
 *
 * arguments for mounting something in a vhost's url namespace
 */
struct lws_http_mount {
        const struct lws_http_mount *mount_next;
        /**< pointer to next struct lws_http_mount */
        const char *mountpoint;
        /**< mountpoint in http pathspace, eg, "/" */
        const char *origin;
        /**< path to be mounted, eg, "/var/www/warmcat.com" */
        const char *def;
        /**< default target, eg, "index.html" */
        const char *protocol;
        /**<"protocol-name" to handle mount */
 
        const struct lws_protocol_vhost_options *cgienv;
        /**< optional linked-list of cgi options.  These are created
         * as environment variables for the cgi process
         */
        const struct lws_protocol_vhost_options *extra_mimetypes;
        /**< optional linked-list of mimetype mappings */
        const struct lws_protocol_vhost_options *interpret;
        /**< optional linked-list of files to be interpreted */
 
        int cgi_timeout;
        /**< seconds cgi is allowed to live, if cgi://mount type */
        int cache_max_age;
        /**< max-age for reuse of client cache of files, seconds */
        unsigned int auth_mask;
        /**< bits set here must be set for authorized client session */
 
        unsigned int cache_reusable:1; /**< set if client cache may reuse this */
        unsigned int cache_revalidate:1; /**< set if client cache should revalidate on use */
        unsigned int cache_intermediaries:1; /**< set if intermediaries are allowed to cache */
        unsigned int cache_no:1; /**< set if client should check cache always*/
 
        unsigned char origin_protocol; /**< one of enum lws_mount_protocols */
        unsigned char mountpoint_len; /**< length of mountpoint string */
 
        const char *basic_auth_login_file;
        /**<NULL, or filepath to use to check basic auth logins against. (requires LWSAUTHM_DEFAULT) */
 
        /* Add new things just above here ---^
         * This is part of the ABI, don't needlessly break compatibility
         */
};
 
///@}
///@}