llcommandhandler.cpp
上传用户:king477883
上传日期:2021-03-01
资源大小:9553k
文件大小:7k
- /**
- * @file llcommandhandler.cpp
- * @brief Central registry for text-driven "commands", most of
- * which manipulate user interface. For example, the command
- * "agent (uuid) about" will open the UI for an avatar's profile.
- *
- * $LicenseInfo:firstyear=2007&license=viewergpl$
- *
- * Copyright (c) 2007-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #include "llviewerprecompiledheaders.h"
- #include "llcommandhandler.h"
- #include "llnotificationsutil.h"
- #include "llcommanddispatcherlistener.h"
- #include "stringize.h"
- // system includes
- #include <boost/tokenizer.hpp>
- #define THROTTLE_PERIOD 15 // required secs between throttled commands
- static LLCommandDispatcherListener sCommandDispatcherListener;
- //---------------------------------------------------------------------------
- // Underlying registry for command handlers, not directly accessible.
- //---------------------------------------------------------------------------
- struct LLCommandHandlerInfo
- {
- LLCommandHandler::EUntrustedAccess mUntrustedBrowserAccess;
- LLCommandHandler* mHandler; // safe, all of these are static objects
- };
- class LLCommandHandlerRegistry
- {
- public:
- static LLCommandHandlerRegistry& instance();
- void add(const char* cmd,
- LLCommandHandler::EUntrustedAccess untrusted_access,
- LLCommandHandler* handler);
- bool dispatch(const std::string& cmd,
- const LLSD& params,
- const LLSD& query_map,
- LLMediaCtrl* web,
- bool trusted_browser);
- private:
- friend LLSD LLCommandDispatcher::enumerate();
- std::map<std::string, LLCommandHandlerInfo> mMap;
- };
- // static
- LLCommandHandlerRegistry& LLCommandHandlerRegistry::instance()
- {
- // Force this to be initialized on first call, because we're going
- // to be adding items to the std::map before main() and we can't
- // rely on a global being initialized in the right order.
- static LLCommandHandlerRegistry instance;
- return instance;
- }
- void LLCommandHandlerRegistry::add(const char* cmd,
- LLCommandHandler::EUntrustedAccess untrusted_access,
- LLCommandHandler* handler)
- {
- LLCommandHandlerInfo info;
- info.mUntrustedBrowserAccess = untrusted_access;
- info.mHandler = handler;
- mMap[cmd] = info;
- }
- bool LLCommandHandlerRegistry::dispatch(const std::string& cmd,
- const LLSD& params,
- const LLSD& query_map,
- LLMediaCtrl* web,
- bool trusted_browser)
- {
- static bool slurl_blocked = false;
- static bool slurl_throttled = false;
- static F64 last_throttle_time = 0.0;
- F64 cur_time = 0.0;
- std::map<std::string, LLCommandHandlerInfo>::iterator it = mMap.find(cmd);
- if (it == mMap.end()) return false;
- const LLCommandHandlerInfo& info = it->second;
- if (!trusted_browser)
- {
- switch (info.mUntrustedBrowserAccess)
- {
- case LLCommandHandler::UNTRUSTED_ALLOW:
- // fall through and let the command be handled
- break;
- case LLCommandHandler::UNTRUSTED_BLOCK:
- // block request from external browser, but report as
- // "handled" because it was well formatted.
- LL_WARNS_ONCE("SLURL") << "Blocked SLURL command from untrusted browser" << LL_ENDL;
- if (! slurl_blocked)
- {
- LLNotificationsUtil::add("BlockedSLURL");
- slurl_blocked = true;
- }
- return true;
- case LLCommandHandler::UNTRUSTED_THROTTLE:
- cur_time = LLTimer::getElapsedSeconds();
- if (cur_time < last_throttle_time + THROTTLE_PERIOD)
- {
- // block request from external browser if it happened
- // within THROTTLE_PERIOD secs of the last command
- LL_WARNS_ONCE("SLURL") << "Throttled SLURL command from untrusted browser" << LL_ENDL;
- if (! slurl_throttled)
- {
- LLNotificationsUtil::add("ThrottledSLURL");
- slurl_throttled = true;
- }
- return true;
- }
- last_throttle_time = cur_time;
- break;
- }
- }
- if (!info.mHandler) return false;
- return info.mHandler->handle(params, query_map, web);
- }
- //---------------------------------------------------------------------------
- // Automatic registration of commands, runs before main()
- //---------------------------------------------------------------------------
- LLCommandHandler::LLCommandHandler(const char* cmd,
- EUntrustedAccess untrusted_access)
- {
- LLCommandHandlerRegistry::instance().add(cmd, untrusted_access, this);
- }
- LLCommandHandler::~LLCommandHandler()
- {
- // Don't care about unregistering these, all the handlers
- // should be static objects.
- }
- //---------------------------------------------------------------------------
- // Public interface
- //---------------------------------------------------------------------------
- // static
- bool LLCommandDispatcher::dispatch(const std::string& cmd,
- const LLSD& params,
- const LLSD& query_map,
- LLMediaCtrl* web,
- bool trusted_browser)
- {
- return LLCommandHandlerRegistry::instance().dispatch(
- cmd, params, query_map, web, trusted_browser);
- }
- static std::string lookup(LLCommandHandler::EUntrustedAccess value);
- LLSD LLCommandDispatcher::enumerate()
- {
- LLSD response;
- LLCommandHandlerRegistry& registry(LLCommandHandlerRegistry::instance());
- for (std::map<std::string, LLCommandHandlerInfo>::const_iterator chi(registry.mMap.begin()),
- chend(registry.mMap.end());
- chi != chend; ++chi)
- {
- LLSD info;
- info["untrusted"] = chi->second.mUntrustedBrowserAccess;
- info["untrusted_str"] = lookup(chi->second.mUntrustedBrowserAccess);
- response[chi->first] = info;
- }
- return response;
- }
- /*------------------------------ lookup stuff ------------------------------*/
- struct symbol_info
- {
- const char* name;
- LLCommandHandler::EUntrustedAccess value;
- };
- #define ent(SYMBOL)
- {
- #SYMBOL + 28, /* skip "LLCommandHandler::UNTRUSTED_" prefix */
- SYMBOL
- }
- symbol_info symbols[] =
- {
- ent(LLCommandHandler::UNTRUSTED_ALLOW), // allow commands from untrusted browsers
- ent(LLCommandHandler::UNTRUSTED_BLOCK), // ignore commands from untrusted browsers
- ent(LLCommandHandler::UNTRUSTED_THROTTLE) // allow untrusted, but only a few per min.
- };
- #undef ent
- static std::string lookup(LLCommandHandler::EUntrustedAccess value)
- {
- for (symbol_info *sii(symbols), *siend(symbols + (sizeof(symbols)/sizeof(symbols[0])));
- sii != siend; ++sii)
- {
- if (sii->value == value)
- {
- return sii->name;
- }
- }
- return STRINGIZE("UNTRUSTED_" << value);
- }