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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2014 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;
}
/**
* libwebsocket_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 libwebsocket_context * that
* represents this server. After calling, user code needs to take care
* of calling libwebsocket_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.
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*
* 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 libwebsocket_context *
libwebsocket_create_context(struct lws_context_creation_info *info)
{
struct libwebsocket_context *context = NULL;
char *p;
#ifndef LWS_NO_DAEMONIZE
int pid_daemon = get_daemonize_pid();
#endif
lwsl_notice("Initial logging level %d\n", log_level);
lwsl_notice("Library version: %s\n", library_version);
#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
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lwsl_info(" LWS_MAX_HEADER_LEN: %u\n", LWS_MAX_HEADER_LEN);
lwsl_info(" LWS_MAX_PROTOCOLS: %u\n", LWS_MAX_PROTOCOLS);
#ifndef LWS_NO_EXTENSIONS
lwsl_info(" LWS_MAX_EXTENSIONS_ACTIVE: %u\n",
LWS_MAX_EXTENSIONS_ACTIVE);
#else
lwsl_notice(" Configured without extension support\n");
#endif
lwsl_info(" SPEC_LATEST_SUPPORTED: %u\n", SPEC_LATEST_SUPPORTED);
lwsl_info(" AWAITING_TIMEOUT: %u\n", AWAITING_TIMEOUT);
lwsl_info(" SYSTEM_RANDOM_FILEPATH: '%s'\n", SYSTEM_RANDOM_FILEPATH);
lwsl_info(" LWS_MAX_ZLIB_CONN_BUFFER: %u\n", LWS_MAX_ZLIB_CONN_BUFFER);
if (lws_plat_context_early_init())
return NULL;
context = (struct libwebsocket_context *)
malloc(sizeof(struct libwebsocket_context));
if (!context) {
lwsl_err("No memory for websocket context\n");
return NULL;
}
memset(context, 0, sizeof(*context));
#ifndef LWS_NO_DAEMONIZE
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->listen_port = info->port;
context->http_proxy_port = 0;
context->http_proxy_address[0] = '\0';
context->options = info->options;
context->iface = info->iface;
/* to reduce this allocation, */
context->max_fds = getdtablesize();
lwsl_notice(" static allocation: %u + (%u x %u fds) = %u bytes\n",
sizeof(struct libwebsocket_context),
sizeof(struct libwebsocket_pollfd) +
sizeof(struct libwebsocket *),
context->max_fds,
sizeof(struct libwebsocket_context) +
((sizeof(struct libwebsocket_pollfd) +
sizeof(struct libwebsocket *)) *
context->max_fds));
context->fds = (struct libwebsocket_pollfd *)
malloc(sizeof(struct libwebsocket_pollfd) *
context->max_fds);
if (context->fds == NULL) {
lwsl_err("Unable to allocate fds array for %d connections\n",
context->max_fds);
free(context);
return NULL;
}
context->lws_lookup = (struct libwebsocket **)
malloc(sizeof(struct libwebsocket *) * context->max_fds);
if (context->lws_lookup == NULL) {
lwsl_err(
"Unable to allocate lws_lookup array for %d connections\n",
context->max_fds);
free(context->fds);
free(context);
return NULL;
}
memset(context->lws_lookup, 0, sizeof(struct libwebsocket *) *
context->max_fds);
if (lws_plat_init_fd_tables(context)) {
free(context->lws_lookup);
free(context->fds);
free(context);
return NULL;
}
#ifndef LWS_NO_EXTENSIONS
context->extensions = info->extensions;
#endif
context->user_space = info->user;
strcpy(context->canonical_hostname, "unknown");
#ifndef LWS_NO_SERVER
if (!(info->options & LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME)) {
/* find canonical hostname */
gethostname((char *)context->canonical_hostname,
sizeof(context->canonical_hostname) - 1);
lwsl_notice(" canonical_hostname = %s\n",
context->canonical_hostname);
}
#endif
/* split the proxy ads:port if given */
if (info->http_proxy_address) {
strncpy(context->http_proxy_address, info->http_proxy_address,
sizeof(context->http_proxy_address) - 1);
context->http_proxy_address[
sizeof(context->http_proxy_address) - 1] = '\0';
context->http_proxy_port = info->http_proxy_port;
} else {
#ifdef HAVE_GETENV
p = getenv("http_proxy");
if (p) {
strncpy(context->http_proxy_address, p,
sizeof(context->http_proxy_address) - 1);
context->http_proxy_address[
sizeof(context->http_proxy_address) - 1] = '\0';
p = strchr(context->http_proxy_address, ':');
if (p == NULL) {
lwsl_err("http_proxy needs to be ads:port\n");
goto bail;
}
*p = '\0';
context->http_proxy_port = atoi(p + 1);
}
#endif
}
lwsl_notice(" Proxy %s:%u\n",
context->http_proxy_address,
context->http_proxy_port);
lwsl_notice(
" per-conn mem: %u + %u headers + protocol rx buf\n",
sizeof(struct libwebsocket),
sizeof(struct allocated_headers));
if (lws_context_init_server_ssl(info, context))
if (lws_context_init_client_ssl(info, context))
Andy Green
committed
goto bail;
Andy Green
committed
if (lws_context_init_server(info, context))
goto bail;
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/*
* 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_parser(" 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:
libwebsocket_context_destroy(context);
return NULL;
}
/**
* libwebsocket_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
libwebsocket_context_destroy(struct libwebsocket_context *context)
{
int n;
struct libwebsocket_protocols *protocol = context->protocols;
#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 libwebsocket *wsi =
context->lws_lookup[context->fds[n].fd];
if (!wsi)
continue;
libwebsocket_close_and_free_session(context,
wsi, LWS_CLOSE_STATUS_NOSTATUS /* no protocol close */);
n--;
}
/*
* give all extensions a chance to clean up any per-context
* allocations they might have made
*/
if (context->listen_port) {
Andy Green
committed
if (lws_ext_callback_for_each_extension_type(context, NULL,
LWS_EXT_CALLBACK_SERVER_CONTEXT_DESTRUCT, NULL, 0) < 0)
Andy Green
committed
if (lws_ext_callback_for_each_extension_type(context, NULL,
LWS_EXT_CALLBACK_CLIENT_CONTEXT_DESTRUCT, NULL, 0) < 0)
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return;
/*
* inform all the protocols that they are done and will have no more
* callbacks
*/
while (protocol->callback) {
protocol->callback(context, NULL, LWS_CALLBACK_PROTOCOL_DESTROY,
NULL, NULL, 0);
protocol++;
}
lws_plat_context_early_destroy(context);
#ifdef LWS_OPENSSL_SUPPORT
if (context->ssl_ctx)
SSL_CTX_free(context->ssl_ctx);
if (context->ssl_client_ctx)
SSL_CTX_free(context->ssl_client_ctx);
ERR_remove_state(0);
ERR_free_strings();
EVP_cleanup();
CRYPTO_cleanup_all_ex_data();
#endif
if (context->fds)
free(context->fds);
if (context->lws_lookup)
free(context->lws_lookup);
free(context);
lws_plat_context_late_destroy(context);
}