/* * libwebsockets - small server side websockets and web server implementation * * Copyright (C) 2010-2018 Andy Green * * 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 * * included from libwebsockets.h */ /*! \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. */ /** enum lws_context_options - context and vhost options */ enum lws_context_options { LWS_SERVER_OPTION_REQUIRE_VALID_OPENSSL_CLIENT_CERT = (1 << 1) | (1 << 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 */ LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME = (1 << 2), /**< (CTX) Don't try to get the server's hostname */ LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT = (1 << 3) | (1 << 12), /**< (VH) Allow non-SSL (plaintext) connections on the same * port as SSL is listening... undermines the security of SSL; * provides LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT */ LWS_SERVER_OPTION_LIBEV = (1 << 4), /**< (CTX) Use libev event loop */ LWS_SERVER_OPTION_DISABLE_IPV6 = (1 << 5), /**< (VH) Disable IPV6 support */ LWS_SERVER_OPTION_DISABLE_OS_CA_CERTS = (1 << 6), /**< (VH) Don't load OS CA certs, you will need to load your * own CA cert(s) */ LWS_SERVER_OPTION_PEER_CERT_NOT_REQUIRED = (1 << 7), /**< (VH) Accept connections with no valid Cert (eg, selfsigned) */ LWS_SERVER_OPTION_VALIDATE_UTF8 = (1 << 8), /**< (VH) Check UT-8 correctness */ LWS_SERVER_OPTION_SSL_ECDH = (1 << 9) | (1 << 12), /**< (VH) initialize ECDH ciphers */ LWS_SERVER_OPTION_LIBUV = (1 << 10), /**< (CTX) Use libuv event loop */ LWS_SERVER_OPTION_REDIRECT_HTTP_TO_HTTPS = (1 << 11) | (1 << 12), /**< (VH) Use http redirect to force http to https * (deprecated: use mount redirection) */ LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT = (1 << 12), /**< (CTX) Initialize the SSL library at all */ LWS_SERVER_OPTION_EXPLICIT_VHOSTS = (1 << 13), /**< (CTX) Only create the context when calling context * create api, implies user code will create its own vhosts */ LWS_SERVER_OPTION_UNIX_SOCK = (1 << 14), /**< (VH) Use Unix socket */ LWS_SERVER_OPTION_STS = (1 << 15), /**< (VH) Send Strict Transport Security header, making * clients subsequently go to https even if user asked for http */ LWS_SERVER_OPTION_IPV6_V6ONLY_MODIFY = (1 << 16), /**< (VH) Enable LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE to take effect */ LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE = (1 << 17), /**< (VH) if set, only ipv6 allowed on the vhost */ LWS_SERVER_OPTION_UV_NO_SIGSEGV_SIGFPE_SPIN = (1 << 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. */ LWS_SERVER_OPTION_JUST_USE_RAW_ORIGIN = (1 << 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. */ LWS_SERVER_OPTION_FALLBACK_TO_RAW = (1 << 20), /**< (VH) if invalid http is coming in the first line, */ LWS_SERVER_OPTION_LIBEVENT = (1 << 21), /**< (CTX) Use libevent event loop */ LWS_SERVER_OPTION_ONLY_RAW = (1 << 22), /**< (VH) All connections to this vhost / port are RAW as soon as * the connection is accepted, no HTTP is going to be coming. */ LWS_SERVER_OPTION_ALLOW_LISTEN_SHARE = (1 << 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. */ LWS_SERVER_OPTION_CREATE_VHOST_SSL_CTX = (1 << 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. */ LWS_SERVER_OPTION_SKIP_PROTOCOL_INIT = (1 << 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. */ LWS_SERVER_OPTION_IGNORE_MISSING_CERT = (1 << 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. */ LWS_SERVER_OPTION_VHOST_UPG_STRICT_HOST_CHECK = (1 << 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 */ LWS_SERVER_OPTION_HTTP_HEADERS_SECURITY_BEST_PRACTICES_ENFORCE = (1 << 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. */ /****** add new things just above ---^ ******/ }; #define lws_check_opt(c, f) (((c) & (f)) == (f)) struct lws_plat_file_ops; /** 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 { 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() */ 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. */ const struct lws_extension *extensions; /**< VHOST: NULL or array of lws_extension structs listing the * extensions this context supports. */ 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 *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.) */ 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.) */ 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.) */ 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 *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" */ unsigned int http_proxy_port; /**< VHOST: If http_proxy_address was non-NULL, uses this port */ int gid; /**< CONTEXT: group id to change to after setting listen socket, * or -1. */ int uid; /**< CONTEXT: user id to change to after setting listen socket, * or -1. */ unsigned int 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. */ 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 */ #if defined(LWS_WITH_TLS) && !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 /* maintain structure layout either way */ void *provided_client_ssl_ctx; /**< dummy if ssl disabled */ #endif 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 */ 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. */ 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. */ const char *ecdh_curve; /**< VHOST: if NULL, defaults to initializing server with * "prime256v1" */ 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. */ const char * const *plugin_dirs; /**< CONTEXT: NULL, or NULL-terminated array of directories to * scan for lws protocol plugins at context creation time */ const struct lws_protocol_vhost_options *pvo; /**< VHOST: pointer to optional linked list of per-vhost * options made accessible to protocols */ int keepalive_timeout; /**< VHOST: (default = 0 = 5s) seconds to allow remote * client to hold on to an idle HTTP/1.1 connection */ 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". */ 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. */ 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. */ 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 */ unsigned short ws_ping_pong_interval; /**< CONTEXT: 0 for none, else interval in seconds between sending * PINGs on idle websocket connections. When the PING is sent, * the PONG must come within the normal timeout_secs timeout period * or the connection will be dropped. * Any RX or TX traffic on the connection restarts the interval timer, * so a connection which always sends or receives something at intervals * less than the interval given here will never send PINGs / expect * PONGs. Conversely as soon as the ws connection is established, an * idle connection will do the PING / PONG roundtrip as soon as * ws_ping_pong_interval seconds has passed without traffic */ 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" */ 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. */ 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:T he certificate the client * should present to the peer on connection */ 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 openSSL library calls */ 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 */ unsigned int client_ssl_ca_mem_len; /**< VHOST: Client SSL context init: length of client_ssl_ca_mem in * bytes */ 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 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. */ int simultaneous_ssl_restriction; /**< CONTEXT: 0 (no limit) or limit of simultaneous SSL sessions * possible.*/ 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 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 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. */ 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 timeout_secs_ah_idle; /**< VHOST: seconds to allow a client to hold an ah without using it. * 0 defaults to 10s. */ 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. */ 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. */ 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" */ 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 */ 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. */ 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. */ 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 */ 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 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". */ /* 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]; /**< 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_vhost_get() - \deprecated deprecated: use lws_get_vhost() */ LWS_VISIBLE LWS_EXTERN struct lws_vhost * lws_vhost_get(struct lws *wsi) LWS_WARN_DEPRECATED; /** * 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_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_json_dump_vhost() - describe vhost state and stats in JSON * * \param vh: the vhost * \param buf: buffer to fill with JSON * \param len: max length of buf */ LWS_VISIBLE LWS_EXTERN int lws_json_dump_vhost(const struct lws_vhost *vh, char *buf, int len); /** * lws_json_dump_context() - describe context state and stats in JSON * * \param context: the context * \param buf: buffer to fill with JSON * \param len: max length of buf * \param hide_vhosts: nonzero to not provide per-vhost mount etc information * * Generates a JSON description of vhost state into buf */ LWS_VISIBLE LWS_EXTERN int lws_json_dump_context(const struct lws_context *context, char *buf, int len, int hide_vhosts); /** * 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); /*! \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 */ }; /** 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 char origin_protocol; /**< one of enum lws_mount_protocols */ unsigned char mountpoint_len; /**< length of mountpoint string */ const char *basic_auth_login_file; /**