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barrier/lib/synergy/CClientApp.cpp

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/*
* synergy -- mouse and keyboard sharing utility
* Copyright (C) 2002 Chris Schoeneman
*
* 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 COPYING 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.
*/
#include "CClientApp.h"
#include "CLog.h"
#include "CArch.h"
#include "XSocket.h"
#include "Version.h"
#include "ProtocolTypes.h"
#include "CString.h"
#include "CScreen.h"
#include "CEvent.h"
#include "CClient.h"
#include "CNetworkAddress.h"
#include "IArchTaskBarReceiver.h"
#include "IEventQueue.h"
#include "TMethodEventJob.h"
#include "CTCPSocketFactory.h"
#include "XScreen.h"
#include "LogOutputters.h"
#include "CSocketMultiplexer.h"
#include "CEventQueue.h"
#if SYSAPI_WIN32
#include "CArchMiscWindows.h"
#endif
#if WINAPI_MSWINDOWS
#include "CMSWindowsScreen.h"
#elif WINAPI_XWINDOWS
#include "CXWindowsScreen.h"
#elif WINAPI_CARBON
#include "COSXScreen.h"
#endif
#include <iostream>
#include <stdio.h>
#define RETRY_TIME 1.0
CClientApp::CClientApp() :
CApp(new CArgs()),
s_client(NULL),
s_clientScreen(NULL)
{
}
CClientApp::~CClientApp()
{
}
CClientApp::CArgs::CArgs() :
m_yscroll(0),
m_serverAddress(NULL)
{
}
CClientApp::CArgs::~CArgs()
{
}
bool
CClientApp::parseArg(const int& argc, const char* const* argv, int& i)
{
if (CApp::parseArg(argc, argv, i)) {
// found common arg
return true;
}
else if (isArg(i, argc, argv, NULL, "--camp")) {
// ignore -- included for backwards compatibility
}
else if (isArg(i, argc, argv, NULL, "--no-camp")) {
// ignore -- included for backwards compatibility
}
else if (isArg(i, argc, argv, NULL, "--yscroll", 1)) {
// define scroll
args().m_yscroll = atoi(argv[++i]);
}
else {
// option not supported here
return false;
}
// argument was valid
return true;
}
void
CClientApp::parseArgs(int argc, const char* const* argv)
{
// asserts values, sets defaults, and parses args
int i;
CApp::parseArgs(argc, argv, i);
// exactly one non-option argument (server-address)
if (i == argc) {
LOG((CLOG_PRINT "%s: a server address or name is required" BYE,
args().m_pname, args().m_pname));
m_bye(kExitArgs);
}
if (i + 1 != argc) {
LOG((CLOG_PRINT "%s: unrecognized option `%s'" BYE,
args().m_pname, argv[i], args().m_pname));
m_bye(kExitArgs);
}
// save server address
try {
*args().m_serverAddress = CNetworkAddress(argv[i], kDefaultPort);
args().m_serverAddress->resolve();
}
catch (XSocketAddress& e) {
// allow an address that we can't look up if we're restartable.
// we'll try to resolve the address each time we connect to the
// server. a bad port will never get better. patch by Brent
// Priddy.
if (!args().m_restartable || e.getError() == XSocketAddress::kBadPort) {
LOG((CLOG_PRINT "%s: %s" BYE,
args().m_pname, e.what(), args().m_pname));
m_bye(kExitFailed);
}
}
// set log filter
if (!CLOG->setFilter(args().m_logFilter)) {
LOG((CLOG_PRINT "%s: unrecognized log level `%s'" BYE,
args().m_pname, args().m_logFilter, args().m_pname));
m_bye(kExitArgs);
}
// identify system
LOG((CLOG_INFO "%s Client on %s %s", kAppVersion, ARCH->getOSName().c_str(), ARCH->getPlatformName().c_str()));
loggingFilterWarning();
}
void
CClientApp::help()
{
#if WINAPI_XWINDOWS
# define WINAPI_ARG \
" [--display <display>]"
# define WINAPI_INFO \
" --display <display> connect to the X server at <display>\n"
#else
# define WINAPI_ARG
# define WINAPI_INFO
#endif
char buffer[2000];
sprintf(
buffer,
"Usage: %s"
" [--yscroll <delta>]"
WINAPI_ARG
HELP_COMMON_ARGS
" <server-address>"
"\n\n"
"Connect to a synergy mouse/keyboard sharing server.\n"
"\n"
HELP_COMMON_INFO_1
WINAPI_INFO
" --yscroll <delta> defines the vertical scrolling delta, which is\n"
HELP_COMMON_INFO_2
"\n"
"* marks defaults.\n"
"\n"
"The server address is of the form: [<hostname>][:<port>]. The hostname\n"
"must be the address or hostname of the server. The port overrides the\n"
"default port, %d.\n",
args().m_pname, kDefaultPort
);
std::cout << buffer << std::endl;
}
const char*
CClientApp::daemonName() const
{
#if SYSAPI_WIN32
return "Synergy+ Client";
#elif SYSAPI_UNIX
return "synergyc";
#endif
}
const char*
CClientApp::daemonInfo() const
{
#if SYSAPI_WIN32
return "Allows another computer to share it's keyboard and mouse with this computer.";
#elif SYSAPI_UNIX
return "";
#endif
}
CScreen*
CClientApp::createScreen()
{
#if WINAPI_MSWINDOWS
return new CScreen(new CMSWindowsScreen(false, args().m_noHooks));
#elif WINAPI_XWINDOWS
return new CScreen(new CXWindowsScreen(args().m_display, false, args().m_yscroll));
#elif WINAPI_CARBON
return new CScreen(new COSXScreen(false));
#endif
}
void
CClientApp::updateStatus()
{
s_taskBarReceiver->updateStatus(s_client, "");
}
void
CClientApp::updateStatus(const CString& msg)
{
s_taskBarReceiver->updateStatus(s_client, msg);
}
void
CClientApp::resetRestartTimeout()
{
// retry time can nolonger be changed
//s_retryTime = 0.0;
}
double
CClientApp::nextRestartTimeout()
{
// retry at a constant rate (Issue 52)
return RETRY_TIME;
/*
// choose next restart timeout. we start with rapid retries
// then slow down.
if (s_retryTime < 1.0) {
s_retryTime = 1.0;
}
else if (s_retryTime < 3.0) {
s_retryTime = 3.0;
}
else {
s_retryTime = 5.0;
}
return s_retryTime;
*/
}
void
CClientApp::handleScreenError(const CEvent&, void*)
{
LOG((CLOG_CRIT "error on screen"));
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
CScreen*
CClientApp::openClientScreen()
{
CScreen* screen = createScreen();
EVENTQUEUE->adoptHandler(IScreen::getErrorEvent(),
screen->getEventTarget(),
new TMethodEventJob<CClientApp>(
this, &CClientApp::handleScreenError));
return screen;
}
void
CClientApp::closeClientScreen(CScreen* screen)
{
if (screen != NULL) {
EVENTQUEUE->removeHandler(IScreen::getErrorEvent(),
screen->getEventTarget());
delete screen;
}
}
void
CClientApp::handleClientRestart(const CEvent&, void* vtimer)
{
// discard old timer
CEventQueueTimer* timer = reinterpret_cast<CEventQueueTimer*>(vtimer);
EVENTQUEUE->deleteTimer(timer);
EVENTQUEUE->removeHandler(CEvent::kTimer, timer);
// reconnect
startClient();
}
void
CClientApp::scheduleClientRestart(double retryTime)
{
// install a timer and handler to retry later
LOG((CLOG_DEBUG "retry in %.0f seconds", retryTime));
CEventQueueTimer* timer = EVENTQUEUE->newOneShotTimer(retryTime, NULL);
EVENTQUEUE->adoptHandler(CEvent::kTimer, timer,
new TMethodEventJob<CClientApp>(this, &CClientApp::handleClientRestart, timer));
}
void
CClientApp::handleClientConnected(const CEvent&, void*)
{
LOG((CLOG_NOTE "connected to server"));
resetRestartTimeout();
updateStatus();
}
void
CClientApp::handleClientFailed(const CEvent& e, void*)
{
CClient::CFailInfo* info =
reinterpret_cast<CClient::CFailInfo*>(e.getData());
updateStatus(CString("Failed to connect to server: ") + info->m_what);
if (!args().m_restartable || !info->m_retry) {
LOG((CLOG_ERR "failed to connect to server: %s", info->m_what.c_str()));
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
else {
LOG((CLOG_WARN "failed to connect to server: %s", info->m_what.c_str()));
if (!s_suspended) {
scheduleClientRestart(nextRestartTimeout());
}
}
delete info;
}
void
CClientApp::handleClientDisconnected(const CEvent&, void*)
{
LOG((CLOG_NOTE "disconnected from server"));
if (!args().m_restartable) {
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
else if (!s_suspended) {
s_client->connect();
}
updateStatus();
}
CClient*
CClientApp::openClient(const CString& name, const CNetworkAddress& address, CScreen* screen)
{
CClient* client = new CClient(
name, address, new CTCPSocketFactory, NULL, screen);
try {
EVENTQUEUE->adoptHandler(
CClient::getConnectedEvent(),
client->getEventTarget(),
new TMethodEventJob<CClientApp>(this, &CClientApp::handleClientConnected));
EVENTQUEUE->adoptHandler(
CClient::getConnectionFailedEvent(),
client->getEventTarget(),
new TMethodEventJob<CClientApp>(this, &CClientApp::handleClientFailed));
EVENTQUEUE->adoptHandler(
CClient::getDisconnectedEvent(),
client->getEventTarget(),
new TMethodEventJob<CClientApp>(this, &CClientApp::handleClientDisconnected));
} catch (std::bad_alloc &ba) {
delete client;
throw ba;
}
return client;
}
void
CClientApp::closeClient(CClient* client)
{
if (client == NULL) {
return;
}
EVENTQUEUE->removeHandler(CClient::getConnectedEvent(), client);
EVENTQUEUE->removeHandler(CClient::getConnectionFailedEvent(), client);
EVENTQUEUE->removeHandler(CClient::getDisconnectedEvent(), client);
delete client;
}
int
CClientApp::foregroundStartup(int argc, char** argv)
{
initApp(argc, argv);
// never daemonize
return mainLoop();
}
bool
CClientApp::startClient()
{
double retryTime;
CScreen* clientScreen = NULL;
try {
if (s_clientScreen == NULL) {
clientScreen = openClientScreen();
s_client = openClient(args().m_name,
*args().m_serverAddress, clientScreen);
s_clientScreen = clientScreen;
LOG((CLOG_NOTE "started client"));
}
s_client->connect();
updateStatus();
return true;
}
catch (XScreenUnavailable& e) {
LOG((CLOG_WARN "cannot open secondary screen: %s", e.what()));
closeClientScreen(clientScreen);
updateStatus(CString("Cannot open secondary screen: ") + e.what());
retryTime = e.getRetryTime();
}
catch (XScreenOpenFailure& e) {
LOG((CLOG_CRIT "cannot open secondary screen: %s", e.what()));
closeClientScreen(clientScreen);
return false;
}
catch (XBase& e) {
LOG((CLOG_CRIT "failed to start client: %s", e.what()));
closeClientScreen(clientScreen);
return false;
}
if (args().m_restartable) {
scheduleClientRestart(retryTime);
return true;
}
else {
// don't try again
return false;
}
}
void
CClientApp::stopClient()
{
closeClient(s_client);
closeClientScreen(s_clientScreen);
s_client = NULL;
s_clientScreen = NULL;
}
int
CClientApp::mainLoop()
{
// create socket multiplexer. this must happen after daemonization
// on unix because threads evaporate across a fork().
CSocketMultiplexer multiplexer;
// create the event queue
CEventQueue eventQueue;
// start client, etc
ARCH->util().startNode();
// run event loop. if startClient() failed we're supposed to retry
// later. the timer installed by startClient() will take care of
// that.
CEvent event;
DAEMON_RUNNING(true);
EVENTQUEUE->getEvent(event);
while (event.getType() != CEvent::kQuit) {
EVENTQUEUE->dispatchEvent(event);
CEvent::deleteData(event);
EVENTQUEUE->getEvent(event);
}
DAEMON_RUNNING(false);
// close down
LOG((CLOG_DEBUG1 "stopping client"));
stopClient();
updateStatus();
LOG((CLOG_NOTE "stopped client"));
return kExitSuccess;
}
static
int
daemonMainLoopStatic(int argc, const char** argv)
{
return CClientApp::instance().daemonMainLoop(argc, argv);
}
int
CClientApp::standardStartup(int argc, char** argv)
{
initApp(argc, argv);
// daemonize if requested
if (args().m_daemon) {
return ARCH->daemonize(daemonName(), &daemonMainLoopStatic);
}
else {
return mainLoop();
}
}
int
CClientApp::runInner(int argc, char** argv, ILogOutputter* outputter, StartupFunc startup, CreateTaskBarReceiverFunc createTaskBarReceiver)
{
// general initialization
args().m_serverAddress = new CNetworkAddress;
args().m_pname = ARCH->getBasename(argv[0]);
// install caller's output filter
if (outputter != NULL) {
CLOG->insert(outputter);
}
// save log messages
// use heap memory because CLog deletes outputters on destruction
CBufferedLogOutputter* logBuffer = new CBufferedLogOutputter(1000);
CLOG->insert(logBuffer, true);
// make the task bar receiver. the user can control this app
// through the task bar.
s_taskBarReceiver = createTaskBarReceiver(logBuffer);
int result;
try
{
// run
result = startup(argc, argv);
}
catch (...)
{
// done with task bar receiver
delete s_taskBarReceiver;
delete args().m_serverAddress;
throw;
}
return result;
}
void
CClientApp::startNode()
{
// start the client. if this return false then we've failed and
// we shouldn't retry.
LOG((CLOG_DEBUG1 "starting client"));
if (!startClient()) {
m_bye(kExitFailed);
}
}
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