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/*
* barrier -- mouse and keyboard sharing utility
* Copyright (C) 2012-2016 Symless Ltd.
* Copyright (C) 2012 Nick Bolton
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* found in the file LICENSE that should have accompanied this file.
*
* This package 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ipc/IpcClientProxy.h"
#include "ipc/Ipc.h"
#include "ipc/IpcMessage.h"
#include "barrier/ProtocolUtil.h"
#include "io/IStream.h"
#include "arch/Arch.h"
#include "base/TMethodEventJob.h"
#include "base/Log.h"
//
// IpcClientProxy
//
IpcClientProxy::IpcClientProxy(barrier::IStream& stream, IEventQueue* events) :
m_stream(stream),
m_clientType(kIpcClientUnknown),
m_disconnecting(false),
m_events(events)
{
m_events->adoptHandler(
m_events->forIStream().inputReady(), stream.getEventTarget(),
new TMethodEventJob<IpcClientProxy>(
this, &IpcClientProxy::handleData));
m_events->adoptHandler(
m_events->forIStream().outputError(), stream.getEventTarget(),
new TMethodEventJob<IpcClientProxy>(
this, &IpcClientProxy::handleWriteError));
m_events->adoptHandler(
m_events->forIStream().inputShutdown(), stream.getEventTarget(),
new TMethodEventJob<IpcClientProxy>(
this, &IpcClientProxy::handleDisconnect));
m_events->adoptHandler(
m_events->forIStream().outputShutdown(), stream.getEventTarget(),
new TMethodEventJob<IpcClientProxy>(
this, &IpcClientProxy::handleWriteError));
}
IpcClientProxy::~IpcClientProxy()
{
m_events->removeHandler(
m_events->forIStream().inputReady(), m_stream.getEventTarget());
m_events->removeHandler(
m_events->forIStream().outputError(), m_stream.getEventTarget());
m_events->removeHandler(
m_events->forIStream().inputShutdown(), m_stream.getEventTarget());
m_events->removeHandler(
m_events->forIStream().outputShutdown(), m_stream.getEventTarget());
// don't delete the stream while it's being used.
{
std::lock_guard<std::mutex> lock_read(m_readMutex);
std::lock_guard<std::mutex> lock_write(m_writeMutex);
delete &m_stream;
}
}
void
IpcClientProxy::handleDisconnect(const Event&, void*)
{
disconnect();
LOG((CLOG_DEBUG "ipc client disconnected"));
}
void
IpcClientProxy::handleWriteError(const Event&, void*)
{
disconnect();
LOG((CLOG_DEBUG "ipc client write error"));
}
void
IpcClientProxy::handleData(const Event&, void*)
{
// don't allow the dtor to destroy the stream while we're using it.
std::lock_guard<std::mutex> lock(m_readMutex);
LOG((CLOG_DEBUG "start ipc handle data"));
UInt8 code[4];
UInt32 n = m_stream.read(code, 4);
while (n != 0) {
LOG((CLOG_DEBUG "ipc read: %c%c%c%c",
code[0], code[1], code[2], code[3]));
IpcMessage* m = nullptr;
if (memcmp(code, kIpcMsgHello, 4) == 0) {
m = parseHello();
}
else if (memcmp(code, kIpcMsgCommand, 4) == 0) {
m = parseCommand();
}
else {
LOG((CLOG_ERR "invalid ipc message"));
disconnect();
}
// don't delete with this event; the data is passed to a new event.
Event e(m_events->forIpcClientProxy().messageReceived(), this, NULL, Event::kDontFreeData);
e.setDataObject(m);
m_events->addEvent(e);
n = m_stream.read(code, 4);
}
LOG((CLOG_DEBUG "finished ipc handle data"));
}
void
IpcClientProxy::send(const IpcMessage& message)
{
// don't allow other threads to write until we've finished the entire
// message. stream write is locked, but only for that single write.
// also, don't allow the dtor to destroy the stream while we're using it.
std::lock_guard<std::mutex> lock(m_writeMutex);
LOG((CLOG_DEBUG4 "ipc write: %d", message.type()));
switch (message.type()) {
case kIpcLogLine: {
const IpcLogLineMessage& llm = static_cast<const IpcLogLineMessage&>(message);
const String logLine = llm.logLine();
ProtocolUtil::writef(&m_stream, kIpcMsgLogLine, &logLine);
break;
}
case kIpcShutdown:
ProtocolUtil::writef(&m_stream, kIpcMsgShutdown);
break;
default:
LOG((CLOG_ERR "ipc message not supported: %d", message.type()));
break;
}
}
IpcHelloMessage*
IpcClientProxy::parseHello()
{
UInt8 type;
ProtocolUtil::readf(&m_stream, kIpcMsgHello + 4, &type);
m_clientType = static_cast<EIpcClientType>(type);
// must be deleted by event handler.
return new IpcHelloMessage(m_clientType);
}
IpcCommandMessage*
IpcClientProxy::parseCommand()
{
String command;
UInt8 elevate;
ProtocolUtil::readf(&m_stream, kIpcMsgCommand + 4, &command, &elevate);
// must be deleted by event handler.
return new IpcCommandMessage(command, elevate != 0);
}
void
IpcClientProxy::disconnect()
{
LOG((CLOG_DEBUG "ipc disconnect, closing stream"));
m_disconnecting = true;
m_stream.close();
m_events->addEvent(Event(m_events->forIpcClientProxy().disconnected(), this));
}
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