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barrier/lib/synergy/CServerApp.cpp

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/*
* synergy -- mouse and keyboard sharing utility
* Copyright (C) 2002 Chris Schoeneman, Nick Bolton, Sorin Sbarnea
*
* 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.
*
* 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 "CServerApp.h"
#include "CLog.h"
#include "CArch.h"
#include "XSocket.h"
#include "Version.h"
#include "IEventQueue.h"
#include "CServer.h"
#include "CClientListener.h"
#include "CClientProxy.h"
#include "TMethodEventJob.h"
#include "CServerTaskBarReceiver.h"
#include "CPrimaryClient.h"
#include "CScreen.h"
#include "CSocketMultiplexer.h"
#include "CEventQueue.h"
#include "LogOutputters.h"
#include "CFunctionEventJob.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>
#include <fstream>
#include "XScreen.h"
#include "CTCPSocketFactory.h"
CEvent::Type CServerApp::s_reloadConfigEvent = CEvent::kUnknown;
CServerApp::CServerApp(CreateTaskBarReceiverFunc createTaskBarReceiver) :
CApp(createTaskBarReceiver, new CArgs()),
s_server(NULL),
s_forceReconnectEvent(CEvent::kUnknown),
s_resetServerEvent(CEvent::kUnknown),
s_serverState(kUninitialized),
s_serverScreen(NULL),
s_primaryClient(NULL),
s_listener(NULL),
s_timer(NULL)
{
}
CServerApp::~CServerApp()
{
}
CServerApp::CArgs::CArgs() :
m_synergyAddress(NULL),
m_config(NULL)
{
}
CServerApp::CArgs::~CArgs()
{
}
bool
CServerApp::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, "-a", "--address", 1)) {
// save listen address
try {
*args().m_synergyAddress = CNetworkAddress(argv[i + 1],
kDefaultPort);
args().m_synergyAddress->resolve();
}
catch (XSocketAddress& e) {
LOG((CLOG_PRINT "%s: %s" BYE,
args().m_pname, e.what(), args().m_pname));
m_bye(kExitArgs);
}
++i;
}
else if (isArg(i, argc, argv, "-c", "--config", 1)) {
// save configuration file path
args().m_configFile = argv[++i];
}
else {
// option not supported here
return false;
}
// argument was valid
return true;
}
void
CServerApp::parseArgs(int argc, const char* const* argv)
{
// asserts values, sets defaults, and parses args
int i;
CApp::parseArgs(argc, argv, i);
// no non-option arguments are allowed
if (i != argc) {
LOG((CLOG_PRINT "%s: unrecognized option `%s'" BYE,
args().m_pname, argv[i], args().m_pname));
m_bye(kExitArgs);
}
// 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 Server on %s %s", kAppVersion, ARCH->getOSName().c_str(), ARCH->getPlatformName().c_str()));
loggingFilterWarning();
}
void
CServerApp::help()
{
// window api args (windows/x-windows/carbon)
#if WINAPI_XWINDOWS
# define WINAPI_ARGS \
" [--display <display>]"
# define WINAPI_INFO \
" --display <display> connect to the X server at <display>\n"
#else
# define WINAPI_ARGS
# define WINAPI_INFO
#endif
char buffer[2000];
sprintf(
buffer,
"Usage: %s"
" [--address <address>]"
" [--config <pathname>]"
WINAPI_ARGS
HELP_SYS_ARGS
HELP_COMMON_ARGS
"\n\n"
"Start the synergy mouse/keyboard sharing server.\n"
"\n"
" -a, --address <address> listen for clients on the given address.\n"
" -c, --config <pathname> use the named configuration file instead.\n"
HELP_COMMON_INFO_1
WINAPI_INFO
HELP_SYS_INFO
HELP_COMMON_INFO_2
"\n"
"* marks defaults.\n"
"\n"
"The argument for --address is of the form: [<hostname>][:<port>]. The\n"
"hostname must be the address or hostname of an interface on the system.\n"
"The default is to listen on all interfaces. The port overrides the\n"
"default port, %d.\n"
"\n"
"If no configuration file pathname is provided then the first of the\n"
"following to load successfully sets the configuration:\n"
" %s\n"
" %s\n",
args().m_pname, kDefaultPort,
ARCH->concatPath(ARCH->getUserDirectory(), USR_CONFIG_NAME).c_str(),
ARCH->concatPath(ARCH->getSystemDirectory(), SYS_CONFIG_NAME).c_str()
);
std::cout << buffer << std::endl;
}
void
CServerApp::reloadSignalHandler(CArch::ESignal, void*)
{
EVENTQUEUE->addEvent(CEvent(getReloadConfigEvent(),
IEventQueue::getSystemTarget()));
}
void
CServerApp::reloadConfig(const CEvent&, void*)
{
LOG((CLOG_DEBUG "reload configuration"));
if (loadConfig(args().m_configFile)) {
if (s_server != NULL) {
s_server->setConfig(*args().m_config);
}
LOG((CLOG_NOTE "reloaded configuration"));
}
}
void
CServerApp::loadConfig()
{
bool loaded = false;
// load the config file, if specified
if (!args().m_configFile.empty()) {
loaded = loadConfig(args().m_configFile);
}
// load the default configuration if no explicit file given
else {
// get the user's home directory
CString path = ARCH->getUserDirectory();
if (!path.empty()) {
// complete path
path = ARCH->concatPath(path, USR_CONFIG_NAME);
// now try loading the user's configuration
if (loadConfig(path)) {
loaded = true;
args().m_configFile = path;
}
}
if (!loaded) {
// try the system-wide config file
path = ARCH->getSystemDirectory();
if (!path.empty()) {
path = ARCH->concatPath(path, SYS_CONFIG_NAME);
if (loadConfig(path)) {
loaded = true;
args().m_configFile = path;
}
}
}
}
if (!loaded) {
LOG((CLOG_PRINT "%s: no configuration available", args().m_pname));
m_bye(kExitConfig);
}
}
bool
CServerApp::loadConfig(const CString& pathname)
{
try {
// load configuration
LOG((CLOG_DEBUG "opening configuration \"%s\"", pathname.c_str()));
std::ifstream configStream(pathname.c_str());
if (!configStream.is_open()) {
// report failure to open configuration as a debug message
// since we try several paths and we expect some to be
// missing.
LOG((CLOG_DEBUG "cannot open configuration \"%s\"",
pathname.c_str()));
return false;
}
configStream >> *args().m_config;
LOG((CLOG_DEBUG "configuration read successfully"));
return true;
}
catch (XConfigRead& e) {
// report error in configuration file
LOG((CLOG_ERR "cannot read configuration \"%s\": %s",
pathname.c_str(), e.what()));
}
return false;
}
CEvent::Type
CServerApp::getReloadConfigEvent()
{
return CEvent::registerTypeOnce(s_reloadConfigEvent, "reloadConfig");
}
void
CServerApp::forceReconnect(const CEvent&, void*)
{
if (s_server != NULL) {
s_server->disconnect();
}
}
CEvent::Type
CServerApp::getForceReconnectEvent()
{
return CEvent::registerTypeOnce(s_forceReconnectEvent, "forceReconnect");
}
CEvent::Type
CServerApp::getResetServerEvent()
{
return CEvent::registerTypeOnce(s_resetServerEvent, "resetServer");
}
void
CServerApp::handleClientConnected(const CEvent&, void* vlistener)
{
CClientListener* listener = reinterpret_cast<CClientListener*>(vlistener);
CClientProxy* client = listener->getNextClient();
if (client != NULL) {
s_server->adoptClient(client);
updateStatus();
}
}
void
CServerApp::handleClientsDisconnected(const CEvent&, void*)
{
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
void
CServerApp::closeServer(CServer* server)
{
if (server == NULL) {
return;
}
// tell all clients to disconnect
server->disconnect();
// wait for clients to disconnect for up to timeout seconds
double timeout = 3.0;
CEventQueueTimer* timer = EVENTQUEUE->newOneShotTimer(timeout, NULL);
EVENTQUEUE->adoptHandler(CEvent::kTimer, timer,
new TMethodEventJob<CServerApp>(this, &CServerApp::handleClientsDisconnected));
EVENTQUEUE->adoptHandler(CServer::getDisconnectedEvent(), server,
new TMethodEventJob<CServerApp>(this, &CServerApp::handleClientsDisconnected));
CEvent event;
EVENTQUEUE->getEvent(event);
while (event.getType() != CEvent::kQuit) {
EVENTQUEUE->dispatchEvent(event);
CEvent::deleteData(event);
EVENTQUEUE->getEvent(event);
}
EVENTQUEUE->removeHandler(CEvent::kTimer, timer);
EVENTQUEUE->deleteTimer(timer);
EVENTQUEUE->removeHandler(CServer::getDisconnectedEvent(), server);
// done with server
delete server;
}
void
CServerApp::stopRetryTimer()
{
if (s_timer != NULL) {
EVENTQUEUE->deleteTimer(s_timer);
EVENTQUEUE->removeHandler(CEvent::kTimer, NULL);
s_timer = NULL;
}
}
void
CServerApp::updateStatus()
{
updateStatus("");
}
void CServerApp::updateStatus( const CString& msg )
{
if (m_taskBarReceiver)
{
m_taskBarReceiver->updateStatus(s_server, msg);
}
}
void
CServerApp::closeClientListener(CClientListener* listen)
{
if (listen != NULL) {
EVENTQUEUE->removeHandler(CClientListener::getConnectedEvent(), listen);
delete listen;
}
}
void
CServerApp::stopServer()
{
if (s_serverState == kStarted) {
closeClientListener(s_listener);
closeServer(s_server);
s_server = NULL;
s_listener = NULL;
s_serverState = kInitialized;
}
else if (s_serverState == kStarting) {
stopRetryTimer();
s_serverState = kInitialized;
}
assert(s_server == NULL);
assert(s_listener == NULL);
}
void
CServerApp::closePrimaryClient(CPrimaryClient* primaryClient)
{
delete primaryClient;
}
void
CServerApp::closeServerScreen(CScreen* screen)
{
if (screen != NULL) {
EVENTQUEUE->removeHandler(IScreen::getErrorEvent(),
screen->getEventTarget());
EVENTQUEUE->removeHandler(IScreen::getSuspendEvent(),
screen->getEventTarget());
EVENTQUEUE->removeHandler(IScreen::getResumeEvent(),
screen->getEventTarget());
delete screen;
}
}
void CServerApp::cleanupServer()
{
stopServer();
if (s_serverState == kInitialized) {
closePrimaryClient(s_primaryClient);
closeServerScreen(s_serverScreen);
s_primaryClient = NULL;
s_serverScreen = NULL;
s_serverState = kUninitialized;
}
else if (s_serverState == kInitializing ||
s_serverState == kInitializingToStart) {
stopRetryTimer();
s_serverState = kUninitialized;
}
assert(s_primaryClient == NULL);
assert(s_serverScreen == NULL);
assert(s_serverState == kUninitialized);
}
void
CServerApp::retryHandler(const CEvent&, void*)
{
// discard old timer
assert(s_timer != NULL);
stopRetryTimer();
// try initializing/starting the server again
switch (s_serverState) {
case kUninitialized:
case kInitialized:
case kStarted:
assert(0 && "bad internal server state");
break;
case kInitializing:
LOG((CLOG_DEBUG1 "retry server initialization"));
s_serverState = kUninitialized;
if (!initServer()) {
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
break;
case kInitializingToStart:
LOG((CLOG_DEBUG1 "retry server initialization"));
s_serverState = kUninitialized;
if (!initServer()) {
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
else if (s_serverState == kInitialized) {
LOG((CLOG_DEBUG1 "starting server"));
if (!startServer()) {
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
}
break;
case kStarting:
LOG((CLOG_DEBUG1 "retry starting server"));
s_serverState = kInitialized;
if (!startServer()) {
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
break;
}
}
bool CServerApp::initServer()
{
// skip if already initialized or initializing
if (s_serverState != kUninitialized) {
return true;
}
double retryTime;
CScreen* serverScreen = NULL;
CPrimaryClient* primaryClient = NULL;
try {
CString name = args().m_config->getCanonicalName(args().m_name);
serverScreen = openServerScreen();
primaryClient = openPrimaryClient(name, serverScreen);
s_serverScreen = serverScreen;
s_primaryClient = primaryClient;
s_serverState = kInitialized;
updateStatus();
return true;
}
catch (XScreenUnavailable& e) {
LOG((CLOG_WARN "cannot open primary screen: %s", e.what()));
closePrimaryClient(primaryClient);
closeServerScreen(serverScreen);
updateStatus(CString("cannot open primary screen: ") + e.what());
retryTime = e.getRetryTime();
}
catch (XScreenOpenFailure& e) {
LOG((CLOG_CRIT "cannot open primary screen: %s", e.what()));
closePrimaryClient(primaryClient);
closeServerScreen(serverScreen);
return false;
}
catch (XBase& e) {
LOG((CLOG_CRIT "failed to start server: %s", e.what()));
closePrimaryClient(primaryClient);
closeServerScreen(serverScreen);
return false;
}
if (args().m_restartable) {
// install a timer and handler to retry later
assert(s_timer == NULL);
LOG((CLOG_DEBUG "retry in %.0f seconds", retryTime));
s_timer = EVENTQUEUE->newOneShotTimer(retryTime, NULL);
EVENTQUEUE->adoptHandler(CEvent::kTimer, s_timer,
new TMethodEventJob<CServerApp>(this, &CServerApp::retryHandler));
s_serverState = kInitializing;
return true;
}
else {
// don't try again
return false;
}
}
CScreen* CServerApp::openServerScreen()
{
CScreen* screen = createScreen();
EVENTQUEUE->adoptHandler(IScreen::getErrorEvent(),
screen->getEventTarget(),
new TMethodEventJob<CServerApp>(
this, &CServerApp::handleScreenError));
EVENTQUEUE->adoptHandler(IScreen::getSuspendEvent(),
screen->getEventTarget(),
new TMethodEventJob<CServerApp>(
this, &CServerApp::handleSuspend));
EVENTQUEUE->adoptHandler(IScreen::getResumeEvent(),
screen->getEventTarget(),
new TMethodEventJob<CServerApp>(
this, &CServerApp::handleResume));
return screen;
}
bool
CServerApp::startServer()
{
// skip if already started or starting
if (s_serverState == kStarting || s_serverState == kStarted) {
return true;
}
// initialize if necessary
if (s_serverState != kInitialized) {
if (!initServer()) {
// hard initialization failure
return false;
}
if (s_serverState == kInitializing) {
// not ready to start
s_serverState = kInitializingToStart;
return true;
}
assert(s_serverState == kInitialized);
}
double retryTime;
CClientListener* listener = NULL;
try {
listener = openClientListener(args().m_config->getSynergyAddress());
s_server = openServer(*args().m_config, s_primaryClient);
s_listener = listener;
updateStatus();
LOG((CLOG_NOTE "started server"));
s_serverState = kStarted;
return true;
}
catch (XSocketAddressInUse& e) {
LOG((CLOG_WARN "cannot listen for clients: %s", e.what()));
closeClientListener(listener);
updateStatus(CString("cannot listen for clients: ") + e.what());
retryTime = 10.0;
}
catch (XBase& e) {
LOG((CLOG_CRIT "failed to start server: %s", e.what()));
closeClientListener(listener);
return false;
}
if (args().m_restartable) {
// install a timer and handler to retry later
assert(s_timer == NULL);
LOG((CLOG_DEBUG "retry in %.0f seconds", retryTime));
s_timer = EVENTQUEUE->newOneShotTimer(retryTime, NULL);
EVENTQUEUE->adoptHandler(CEvent::kTimer, s_timer,
new TMethodEventJob<CServerApp>(this, &CServerApp::retryHandler));
s_serverState = kStarting;
return true;
}
else {
// don't try again
return false;
}
}
CScreen*
CServerApp::createScreen()
{
#if WINAPI_MSWINDOWS
return new CScreen(new CMSWindowsScreen(true, args().m_noHooks));
#elif WINAPI_XWINDOWS
return new CScreen(new CXWindowsScreen(
args().m_display, true, args().m_disableXInitThreads));
#elif WINAPI_CARBON
return new CScreen(new COSXScreen(true));
#endif
}
CPrimaryClient*
CServerApp::openPrimaryClient(const CString& name, CScreen* screen)
{
LOG((CLOG_DEBUG1 "creating primary screen"));
return new CPrimaryClient(name, screen);
}
void
CServerApp::handleScreenError(const CEvent&, void*)
{
LOG((CLOG_CRIT "error on screen"));
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
void
CServerApp::handleSuspend(const CEvent&, void*)
{
if (!m_suspended) {
LOG((CLOG_INFO "suspend"));
stopServer();
m_suspended = true;
}
}
void
CServerApp::handleResume(const CEvent&, void*)
{
if (m_suspended) {
LOG((CLOG_INFO "resume"));
startServer();
m_suspended = false;
}
}
CClientListener*
CServerApp::openClientListener(const CNetworkAddress& address)
{
CClientListener* listen =
new CClientListener(address, new CTCPSocketFactory, NULL);
EVENTQUEUE->adoptHandler(CClientListener::getConnectedEvent(), listen,
new TMethodEventJob<CServerApp>(
this, &CServerApp::handleClientConnected, listen));
return listen;
}
CServer*
CServerApp::openServer(const CConfig& config, CPrimaryClient* primaryClient)
{
CServer* server = new CServer(config, primaryClient);
try {
EVENTQUEUE->adoptHandler(
CServer::getDisconnectedEvent(), server,
new TMethodEventJob<CServerApp>(this, &CServerApp::handleNoClients));
} catch (std::bad_alloc &ba) {
delete server;
throw ba;
}
return server;
}
void CServerApp::handleNoClients( const CEvent&, void* )
{
updateStatus();
}
int CServerApp::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;
// if configuration has no screens then add this system
// as the default
if (args().m_config->begin() == args().m_config->end()) {
args().m_config->addScreen(args().m_name);
}
// set the contact address, if provided, in the config.
// otherwise, if the config doesn't have an address, use
// the default.
if (args().m_synergyAddress->isValid()) {
args().m_config->setSynergyAddress(*args().m_synergyAddress);
}
else if (!args().m_config->getSynergyAddress().isValid()) {
args().m_config->setSynergyAddress(CNetworkAddress(kDefaultPort));
}
// canonicalize the primary screen name
CString primaryName = args().m_config->getCanonicalName(args().m_name);
if (primaryName.empty()) {
LOG((CLOG_CRIT "unknown screen name `%s'", args().m_name.c_str()));
return kExitFailed;
}
// start server, etc
ARCH->util().startNode();
// handle hangup signal by reloading the server's configuration
ARCH->setSignalHandler(CArch::kHANGUP, &reloadSignalHandler, NULL);
EVENTQUEUE->adoptHandler(getReloadConfigEvent(),
IEventQueue::getSystemTarget(),
new TMethodEventJob<CServerApp>(this, &CServerApp::reloadConfig));
// handle force reconnect event by disconnecting clients. they'll
// reconnect automatically.
EVENTQUEUE->adoptHandler(getForceReconnectEvent(),
IEventQueue::getSystemTarget(),
new TMethodEventJob<CServerApp>(this, &CServerApp::forceReconnect));
// to work around the sticky meta keys problem, we'll give users
// the option to reset the state of synergys
EVENTQUEUE->adoptHandler(getResetServerEvent(),
IEventQueue::getSystemTarget(),
new TMethodEventJob<CServerApp>(this, &CServerApp::resetServer));
// run event loop. if startServer() failed we're supposed to retry
// later. the timer installed by startServer() 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 server"));
EVENTQUEUE->removeHandler(getForceReconnectEvent(),
IEventQueue::getSystemTarget());
EVENTQUEUE->removeHandler(getReloadConfigEvent(),
IEventQueue::getSystemTarget());
cleanupServer();
updateStatus();
LOG((CLOG_NOTE "stopped server"));
return kExitSuccess;
}
void CServerApp::resetServer(const CEvent&, void*)
{
LOG((CLOG_DEBUG1 "resetting server"));
stopServer();
cleanupServer();
startServer();
}
int
CServerApp::runInner(int argc, char** argv, ILogOutputter* outputter, StartupFunc startup)
{
// general initialization
args().m_synergyAddress = new CNetworkAddress;
args().m_config = new CConfig;
args().m_pname = ARCH->getBasename(argv[0]);
// install caller's output filter
if (outputter != NULL) {
CLOG->insert(outputter);
}
// run
int result = startup(argc, argv);
if (m_taskBarReceiver)
{
// done with task bar receiver
delete m_taskBarReceiver;
}
delete args().m_config;
delete args().m_synergyAddress;
return result;
}
int daemonMainLoopStatic(int argc, const char** argv) {
return CServerApp::instance().daemonMainLoop(argc, argv);
}
int
CServerApp::standardStartup(int argc, char** argv)
{
initApp(argc, argv);
// daemonize if requested
if (args().m_daemon) {
return ARCH->daemonize(daemonName(), daemonMainLoopStatic);
}
else {
return mainLoop();
}
}
int
CServerApp::foregroundStartup(int argc, char** argv)
{
initApp(argc, argv);
// never daemonize
return mainLoop();
}
static
int
mainLoopStatic()
{
return CServerApp::instance().mainLoop();
}
const char*
CServerApp::daemonName() const
{
#if SYSAPI_WIN32
return "Synergy Server";
#elif SYSAPI_UNIX
return "synergys";
#endif
}
const char*
CServerApp::daemonInfo() const
{
#if SYSAPI_WIN32
return "Shares this computers mouse and keyboard with other computers.";
#elif SYSAPI_UNIX
return "";
#endif
}
void
CServerApp::startNode()
{
// start the server. if this return false then we've failed and
// we shouldn't retry.
LOG((CLOG_DEBUG1 "starting server"));
if (!startServer()) {
m_bye(kExitFailed);
}
}
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