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/**
* @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.
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* 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 only.
*
* 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
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#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);
}
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