lws-callbacks.h

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/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2019 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.
 */

 
struct lws_ssl_info {
        int where;
        int ret;
};
 
enum lws_cert_update_state {
        LWS_CUS_IDLE,
        LWS_CUS_STARTING,
        LWS_CUS_SUCCESS,
        LWS_CUS_FAILED,
 
        LWS_CUS_CREATE_KEYS,
        LWS_CUS_REG,
        LWS_CUS_AUTH,
        LWS_CUS_CHALLENGE,
        LWS_CUS_CREATE_REQ,
        LWS_CUS_REQ,
        LWS_CUS_CONFIRM,
        LWS_CUS_ISSUE,
};
 
enum {
        LWS_TLS_REQ_ELEMENT_COUNTRY,
        LWS_TLS_REQ_ELEMENT_STATE,
        LWS_TLS_REQ_ELEMENT_LOCALITY,
        LWS_TLS_REQ_ELEMENT_ORGANIZATION,
        LWS_TLS_REQ_ELEMENT_COMMON_NAME,
        LWS_TLS_REQ_ELEMENT_SUBJECT_ALT_NAME,
        LWS_TLS_REQ_ELEMENT_EMAIL,
 
        LWS_TLS_REQ_ELEMENT_COUNT,
 
        LWS_TLS_SET_DIR_URL = LWS_TLS_REQ_ELEMENT_COUNT,
        LWS_TLS_SET_AUTH_PATH,
        LWS_TLS_SET_CERT_PATH,
        LWS_TLS_SET_KEY_PATH,
 
        LWS_TLS_TOTAL_COUNT
};
 
struct lws_acme_cert_aging_args {
        struct lws_vhost *vh;
        const char *element_overrides[LWS_TLS_TOTAL_COUNT]; /* NULL = use pvo */
};
 
/*
 * With LWS_CALLBACK_FILTER_NETWORK_CONNECTION callback, user_data pointer
 * points to one of these
 */
 
struct lws_filter_network_conn_args {
        struct sockaddr_storage         cli_addr;
        socklen_t                       clilen;
        lws_sockfd_type                  accept_fd;
};
 
/*
 * NOTE: These public enums are part of the abi.  If you want to add one,
 * add it at where specified so existing users are unaffected.
 */
enum lws_callback_reasons {
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to wsi and protocol binding lifecycle -----
         */
 
        LWS_CALLBACK_PROTOCOL_INIT                            = 27,
 
        LWS_CALLBACK_PROTOCOL_DESTROY                              = 28,
 
        LWS_CALLBACK_WSI_CREATE                                  = 29,
 
        LWS_CALLBACK_WSI_DESTROY                                = 30,
 
        LWS_CALLBACK_WSI_TX_CREDIT_GET                            = 103,
 
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to Server TLS -----
         */
 
        LWS_CALLBACK_OPENSSL_LOAD_EXTRA_CLIENT_VERIFY_CERTS  = 21,
 
        LWS_CALLBACK_OPENSSL_LOAD_EXTRA_SERVER_VERIFY_CERTS  = 22,
 
        LWS_CALLBACK_OPENSSL_PERFORM_CLIENT_CERT_VERIFICATION      = 23,
 
        LWS_CALLBACK_SSL_INFO                                      = 67,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to Client TLS -----
         */
 
        LWS_CALLBACK_OPENSSL_PERFORM_SERVER_CERT_VERIFICATION = 58,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to HTTP Server  -----
         */
 
        LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED          = 19,
 
        LWS_CALLBACK_HTTP                                      = 12,
 
        LWS_CALLBACK_HTTP_BODY                                    = 13,
 
        LWS_CALLBACK_HTTP_BODY_COMPLETION                      = 14,
 
        LWS_CALLBACK_HTTP_FILE_COMPLETION                      = 15,
 
        LWS_CALLBACK_HTTP_WRITEABLE                          = 16,
 
        LWS_CALLBACK_CLOSED_HTTP                                =  5,
 
        LWS_CALLBACK_FILTER_HTTP_CONNECTION                  = 18,
 
        LWS_CALLBACK_ADD_HEADERS                                = 53,
 
        LWS_CALLBACK_VERIFY_BASIC_AUTHORIZATION = 102,
 
        LWS_CALLBACK_CHECK_ACCESS_RIGHTS                        = 51,
 
        LWS_CALLBACK_PROCESS_HTML                              = 52,
 
        LWS_CALLBACK_HTTP_BIND_PROTOCOL                          = 49,
 
        LWS_CALLBACK_HTTP_DROP_PROTOCOL                          = 50,
 
        LWS_CALLBACK_HTTP_CONFIRM_UPGRADE                      = 86,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to HTTP Client  -----
         */
 
        LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP                        = 44,
 
        LWS_CALLBACK_CLOSED_CLIENT_HTTP                          = 45,
 
        LWS_CALLBACK_RECEIVE_CLIENT_HTTP_READ                      = 48,
 
        LWS_CALLBACK_RECEIVE_CLIENT_HTTP                        = 46,
        LWS_CALLBACK_COMPLETED_CLIENT_HTTP                    = 47,
 
        LWS_CALLBACK_CLIENT_HTTP_WRITEABLE                    = 57,
 
        LWS_CALLBACK_CLIENT_HTTP_REDIRECT                      = 104,
 
        LWS_CALLBACK_CLIENT_HTTP_BIND_PROTOCOL                    = 85,
        LWS_CALLBACK_CLIENT_HTTP_DROP_PROTOCOL                    = 76,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to Websocket Server -----
         */
 
        LWS_CALLBACK_ESTABLISHED                                =  0,
 
        LWS_CALLBACK_CLOSED                                  =  4,
 
        LWS_CALLBACK_SERVER_WRITEABLE                              = 11,
 
        LWS_CALLBACK_RECEIVE                                        =  6,
 
        LWS_CALLBACK_RECEIVE_PONG                              =  7,
 
        LWS_CALLBACK_WS_PEER_INITIATED_CLOSE                        = 38,
 
        LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION                  = 20,
 
        LWS_CALLBACK_CONFIRM_EXTENSION_OKAY                  = 25,
 
        LWS_CALLBACK_WS_SERVER_BIND_PROTOCOL                        = 77,
        LWS_CALLBACK_WS_SERVER_DROP_PROTOCOL                        = 78,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to Websocket Client -----
         */
 
        LWS_CALLBACK_CLIENT_CONNECTION_ERROR                        =  1,
 
        LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH                =  2,
 
        LWS_CALLBACK_CLIENT_ESTABLISHED                          =  3,
 
        LWS_CALLBACK_CLIENT_CLOSED                            = 75,
 
        LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER          = 24,
 
        LWS_CALLBACK_CLIENT_RECEIVE                          =  8,
 
        LWS_CALLBACK_CLIENT_RECEIVE_PONG                        =  9,
 
        LWS_CALLBACK_CLIENT_WRITEABLE                              = 10,
 
        LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED          = 26,
 
        LWS_CALLBACK_WS_EXT_DEFAULTS                                = 39,
 
 
        LWS_CALLBACK_FILTER_NETWORK_CONNECTION                    = 17,
 
        LWS_CALLBACK_WS_CLIENT_BIND_PROTOCOL                        = 79,
        LWS_CALLBACK_WS_CLIENT_DROP_PROTOCOL                        = 80,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to external poll loop integration  -----
         */
 
        LWS_CALLBACK_GET_THREAD_ID                            = 31,
 
        /* external poll() management support */
        LWS_CALLBACK_ADD_POLL_FD                                = 32,
 
        LWS_CALLBACK_DEL_POLL_FD                                = 33,
 
        LWS_CALLBACK_CHANGE_MODE_POLL_FD                        = 34,
 
        LWS_CALLBACK_LOCK_POLL                                    = 35,
 
        LWS_CALLBACK_UNLOCK_POLL                                = 36,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to CGI serving -----
         */
 
        LWS_CALLBACK_CGI                                        = 40,
 
        LWS_CALLBACK_CGI_TERMINATED                          = 41,
 
        LWS_CALLBACK_CGI_STDIN_DATA                          = 42,
 
        LWS_CALLBACK_CGI_STDIN_COMPLETED                        = 43,
 
        LWS_CALLBACK_CGI_PROCESS_ATTACH                          = 70,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to Generic Sessions -----
         */
 
        LWS_CALLBACK_SESSION_INFO                              = 54,
 
        LWS_CALLBACK_GS_EVENT                                      = 55,
 
        LWS_CALLBACK_HTTP_PMO                                      = 56,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to RAW PROXY -----
         */
 
        LWS_CALLBACK_RAW_PROXY_CLI_RX                              = 89,
 
        LWS_CALLBACK_RAW_PROXY_SRV_RX                              = 90,
 
        LWS_CALLBACK_RAW_PROXY_CLI_CLOSE                        = 91,
 
        LWS_CALLBACK_RAW_PROXY_SRV_CLOSE                        = 92,
 
        LWS_CALLBACK_RAW_PROXY_CLI_WRITEABLE                        = 93,
 
        LWS_CALLBACK_RAW_PROXY_SRV_WRITEABLE                        = 94,
 
        LWS_CALLBACK_RAW_PROXY_CLI_ADOPT                        = 95,
 
        LWS_CALLBACK_RAW_PROXY_SRV_ADOPT                        = 96,
 
        LWS_CALLBACK_RAW_PROXY_CLI_BIND_PROTOCOL                = 97,
        LWS_CALLBACK_RAW_PROXY_SRV_BIND_PROTOCOL                = 98,
        LWS_CALLBACK_RAW_PROXY_CLI_DROP_PROTOCOL                = 99,
        LWS_CALLBACK_RAW_PROXY_SRV_DROP_PROTOCOL                = 100,
 
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to RAW sockets -----
         */
 
        LWS_CALLBACK_RAW_RX                                  = 59,
 
        LWS_CALLBACK_RAW_CLOSE                                    = 60,
 
        LWS_CALLBACK_RAW_WRITEABLE                            = 61,
 
        LWS_CALLBACK_RAW_ADOPT                                    = 62,
 
        LWS_CALLBACK_RAW_CONNECTED                            = 101,
 
        LWS_CALLBACK_RAW_SKT_BIND_PROTOCOL                    = 81,
        LWS_CALLBACK_RAW_SKT_DROP_PROTOCOL                    = 82,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to RAW file handles -----
         */
 
        LWS_CALLBACK_RAW_ADOPT_FILE                          = 63,
 
        LWS_CALLBACK_RAW_RX_FILE                                = 64,
 
        LWS_CALLBACK_RAW_WRITEABLE_FILE                          = 65,
 
        LWS_CALLBACK_RAW_CLOSE_FILE                          = 66,
 
        LWS_CALLBACK_RAW_FILE_BIND_PROTOCOL                  = 83,
        LWS_CALLBACK_RAW_FILE_DROP_PROTOCOL                  = 84,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to generic wsi events -----
         */
 
        LWS_CALLBACK_TIMER                                    = 73,
 
        LWS_CALLBACK_EVENT_WAIT_CANCELLED                      = 71,
 
        LWS_CALLBACK_CHILD_CLOSING                            = 69,
 
        LWS_CALLBACK_CONNECTING                                  = 105,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to TLS certificate management -----
         */
 
        LWS_CALLBACK_VHOST_CERT_AGING                              = 72,
 
        LWS_CALLBACK_VHOST_CERT_UPDATE                            = 74,
 
        /* ---------------------------------------------------------------------
         * ----- Callbacks related to MQTT Client  -----
         */
 
        LWS_CALLBACK_MQTT_NEW_CLIENT_INSTANTIATED              = 200,
        LWS_CALLBACK_MQTT_IDLE                                    = 201,
        LWS_CALLBACK_MQTT_CLIENT_ESTABLISHED                        = 202,
        LWS_CALLBACK_MQTT_SUBSCRIBED                                = 203,
        LWS_CALLBACK_MQTT_CLIENT_WRITEABLE                    = 204,
        LWS_CALLBACK_MQTT_CLIENT_RX                          = 205,
        LWS_CALLBACK_MQTT_UNSUBSCRIBED                            = 206,
        LWS_CALLBACK_MQTT_DROP_PROTOCOL                          = 207,
        LWS_CALLBACK_MQTT_CLIENT_CLOSED                          = 208,
        LWS_CALLBACK_MQTT_ACK                                      = 209,
        LWS_CALLBACK_MQTT_RESEND                                = 210,
        LWS_CALLBACK_MQTT_UNSUBSCRIBE_TIMEOUT                      = 211,
        LWS_CALLBACK_MQTT_SHADOW_TIMEOUT                        = 212,
 
        /****** add new things just above ---^ ******/
 
        LWS_CALLBACK_USER = 1000,
};
 
 

typedef int
lws_callback_function(struct lws *wsi, enum lws_callback_reasons reason,
                    void *user, void *in, size_t len);
 
#define LWS_CB_REASON_AUX_BF__CGI               1
#define LWS_CB_REASON_AUX_BF__PROXY             2
#define LWS_CB_REASON_AUX_BF__CGI_CHUNK_END     4
#define LWS_CB_REASON_AUX_BF__CGI_HEADERS       8
#define LWS_CB_REASON_AUX_BF__PROXY_TRANS_END   16
#define LWS_CB_REASON_AUX_BF__PROXY_HEADERS     32