| /* |
| * libwebsockets - small server side websockets and web server implementation |
| * |
| * Copyright (C) 2010-2015 Andy Green <andy@warmcat.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation: |
| * version 2.1 of the License. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| * MA 02110-1301 USA |
| */ |
| |
| #include "private-libwebsockets.h" |
| |
| #ifndef LWS_BUILD_HASH |
| #define LWS_BUILD_HASH "unknown-build-hash" |
| #endif |
| |
| static const char *library_version = LWS_LIBRARY_VERSION " " LWS_BUILD_HASH; |
| |
| /** |
| * lws_get_library_version: get version and git hash library built from |
| * |
| * returns a const char * to a string like "1.1 178d78c" |
| * representing the library version followed by the git head hash it |
| * was built from |
| */ |
| |
| LWS_VISIBLE const char * |
| lws_get_library_version(void) |
| { |
| return library_version; |
| } |
| |
| /** |
| * lws_create_context() - Create the websocket handler |
| * @info: pointer to struct with parameters |
| * |
| * This function creates the listening socket (if serving) and takes care |
| * of all initialization in one step. |
| * |
| * 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 callack 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 struct lws_context * |
| lws_create_context(struct lws_context_creation_info *info) |
| { |
| struct lws_context *context = NULL; |
| char *p; |
| #if LWS_POSIX |
| int pid_daemon = get_daemonize_pid(); |
| #endif |
| |
| lwsl_notice("Initial logging level %d\n", log_level); |
| |
| lwsl_notice("Libwebsockets version: %s\n", library_version); |
| #if LWS_POSIX |
| #ifdef LWS_USE_IPV6 |
| if (!(info->options & LWS_SERVER_OPTION_DISABLE_IPV6)) |
| lwsl_notice("IPV6 compiled in and enabled\n"); |
| else |
| lwsl_notice("IPV6 compiled in but disabled\n"); |
| #else |
| lwsl_notice("IPV6 not compiled in\n"); |
| #endif |
| #endif |
| lws_feature_status_libev(info); |
| lwsl_info(" LWS_MAX_HEADER_LEN: %u\n", LWS_MAX_HEADER_LEN); |
| lwsl_info(" LWS_MAX_PROTOCOLS: %u\n", LWS_MAX_PROTOCOLS); |
| |
| lwsl_info(" SPEC_LATEST_SUPPORTED: %u\n", SPEC_LATEST_SUPPORTED); |
| lwsl_info(" AWAITING_TIMEOUT: %u\n", AWAITING_TIMEOUT); |
| #if LWS_POSIX |
| lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH); |
| lwsl_info(" LWS_MAX_ZLIB_CONN_BUFFER: %u\n", LWS_MAX_ZLIB_CONN_BUFFER); |
| #endif |
| if (lws_plat_context_early_init()) |
| return NULL; |
| |
| context = lws_zalloc(sizeof(struct lws_context)); |
| if (!context) { |
| lwsl_err("No memory for websocket context\n"); |
| return NULL; |
| } |
| #if LWS_POSIX |
| if (pid_daemon) { |
| context->started_with_parent = pid_daemon; |
| lwsl_notice(" Started with daemon pid %d\n", pid_daemon); |
| } |
| #endif |
| |
| context->listen_service_extraseen = 0; |
| context->protocols = info->protocols; |
| context->token_limits = info->token_limits; |
| context->listen_port = info->port; |
| context->http_proxy_port = 0; |
| context->http_proxy_address[0] = '\0'; |
| context->options = info->options; |
| context->iface = info->iface; |
| context->ka_time = info->ka_time; |
| context->ka_interval = info->ka_interval; |
| context->ka_probes = info->ka_probes; |
| |
| if (!info->ka_interval && info->ka_time > 0) { |
| lwsl_err("info->ka_interval can't be 0 if ka_time used\n"); |
| return NULL; |
| } |
| |
| #ifdef LWS_USE_LIBEV |
| /* (Issue #264) In order to *avoid breaking backwards compatibility*, we |
| * enable libev mediated SIGINT handling with a default handler of |
| * lws_sigint_cb. The handler can be overridden or disabled |
| * by invoking lws_sigint_cfg after creating the context, but |
| * before invoking lws_initloop: |
| */ |
| context->use_ev_sigint = 1; |
| context->lws_ev_sigint_cb = &lws_sigint_cb; |
| #endif /* LWS_USE_LIBEV */ |
| |
| /* to reduce this allocation, */ |
| context->max_fds = getdtablesize(); |
| lwsl_notice(" static allocation: %u + (%u x %u fds) = %u bytes\n", |
| sizeof(struct lws_context), |
| sizeof(struct lws_pollfd) + |
| sizeof(struct lws *), |
| context->max_fds, |
| sizeof(struct lws_context) + |
| ((sizeof(struct lws_pollfd) + |
| sizeof(struct lws *)) * |
| context->max_fds)); |
| |
| context->fds = lws_zalloc(sizeof(struct lws_pollfd) * |
| context->max_fds); |
| if (context->fds == NULL) { |
| lwsl_err("Unable to allocate fds array for %d connections\n", |
| context->max_fds); |
| goto bail; |
| } |
| |
| if (lws_plat_init_lookup(context)) |
| goto bail; |
| |
| if (lws_plat_init_fd_tables(context)) |
| goto bail; |
| |
| lws_context_init_extensions(info, context); |
| |
| context->user_space = info->user; |
| |
| strcpy(context->canonical_hostname, "unknown"); |
| |
| lws_server_get_canonical_hostname(context, info); |
| |
| /* either use proxy from info, or try get it from env var */ |
| |
| if (info->http_proxy_address) { |
| /* override for backwards compatibility */ |
| if (info->http_proxy_port) |
| context->http_proxy_port = info->http_proxy_port; |
| lws_set_proxy(context, info->http_proxy_address); |
| } else { |
| #ifdef LWS_HAVE_GETENV |
| p = getenv("http_proxy"); |
| if (p) |
| lws_set_proxy(context, p); |
| #endif |
| } |
| |
| lwsl_notice( |
| " per-conn mem: %u + %u headers + protocol rx buf\n", |
| sizeof(struct lws), |
| sizeof(struct allocated_headers)); |
| |
| if (lws_context_init_server_ssl(info, context)) |
| goto bail; |
| |
| if (lws_context_init_client_ssl(info, context)) |
| goto bail; |
| |
| if (lws_context_init_server(info, context)) |
| goto bail; |
| |
| /* |
| * drop any root privs for this process |
| * to listen on port < 1023 we would have needed root, but now we are |
| * listening, we don't want the power for anything else |
| */ |
| lws_plat_drop_app_privileges(info); |
| |
| /* initialize supported protocols */ |
| |
| for (context->count_protocols = 0; |
| info->protocols[context->count_protocols].callback; |
| context->count_protocols++) { |
| |
| // lwsl_notice(" Protocol: %s\n", |
| // info->protocols[context->count_protocols].name); |
| |
| info->protocols[context->count_protocols].owning_server = |
| context; |
| info->protocols[context->count_protocols].protocol_index = |
| context->count_protocols; |
| |
| /* |
| * inform all the protocols that they are doing their one-time |
| * initialization if they want to |
| */ |
| info->protocols[context->count_protocols].callback(context, |
| NULL, LWS_CALLBACK_PROTOCOL_INIT, NULL, NULL, 0); |
| } |
| |
| /* |
| * give all extensions a chance to create any per-context |
| * allocations they need |
| */ |
| |
| if (info->port != CONTEXT_PORT_NO_LISTEN) { |
| if (lws_ext_callback_for_each_extension_type(context, NULL, |
| LWS_EXT_CALLBACK_SERVER_CONTEXT_CONSTRUCT, |
| NULL, 0) < 0) |
| goto bail; |
| } else |
| if (lws_ext_callback_for_each_extension_type(context, NULL, |
| LWS_EXT_CALLBACK_CLIENT_CONTEXT_CONSTRUCT, |
| NULL, 0) < 0) |
| goto bail; |
| |
| return context; |
| |
| bail: |
| lws_context_destroy(context); |
| return NULL; |
| } |
| |
| /** |
| * lws_context_destroy() - Destroy the websocket context |
| * @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 void |
| lws_context_destroy(struct lws_context *context) |
| { |
| /* Note that this is used for freeing partially allocated structs as well |
| * so make sure you don't try to free something uninitialized */ |
| int n; |
| struct lws_protocols *protocol = NULL; |
| |
| lwsl_notice("%s\n", __func__); |
| |
| if (!context) |
| return; |
| |
| #ifdef LWS_LATENCY |
| if (context->worst_latency_info[0]) |
| lwsl_notice("Worst latency: %s\n", context->worst_latency_info); |
| #endif |
| |
| for (n = 0; n < context->fds_count; n++) { |
| struct lws *wsi = |
| wsi_from_fd(context, context->fds[n].fd); |
| if (!wsi) |
| continue; |
| lws_close_and_free_session(context, |
| wsi, LWS_CLOSE_STATUS_NOSTATUS_CONTEXT_DESTROY /* no protocol close */); |
| n--; |
| } |
| |
| /* |
| * give all extensions a chance to clean up any per-context |
| * allocations they might have made |
| */ |
| // TODO: I am not sure, but are we never supposed to be able to run a server |
| // and client at the same time for a given context? |
| // Otherwise both of these callbacks should always be called! |
| if (context->listen_port != CONTEXT_PORT_NO_LISTEN) { |
| if (lws_ext_callback_for_each_extension_type(context, NULL, |
| LWS_EXT_CALLBACK_SERVER_CONTEXT_DESTRUCT, NULL, 0) < 0) { |
| lwsl_err("Got error from server extension callback on cleanup"); |
| } |
| } else { |
| if (lws_ext_callback_for_each_extension_type(context, NULL, |
| LWS_EXT_CALLBACK_CLIENT_CONTEXT_DESTRUCT, NULL, 0) < 0) { |
| lwsl_err("Got error from client extension callback on cleanup"); |
| } |
| } |
| |
| /* |
| * inform all the protocols that they are done and will have no more |
| * callbacks |
| */ |
| protocol = context->protocols; |
| if (protocol) { |
| while (protocol->callback) { |
| protocol->callback(context, NULL, LWS_CALLBACK_PROTOCOL_DESTROY, |
| NULL, NULL, 0); |
| protocol++; |
| } |
| } |
| |
| lws_plat_context_early_destroy(context); |
| |
| lws_ssl_context_destroy(context); |
| |
| if (context->fds) |
| lws_free(context->fds); |
| |
| lws_plat_context_late_destroy(context); |
| |
| lws_free(context); |
| } |