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barrier/cmd/synergyc/synergyc.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 "CClient.h"
#include "CScreen.h"
#include "ProtocolTypes.h"
#include "Version.h"
#include "XScreen.h"
#include "CNetworkAddress.h"
#include "CSocketMultiplexer.h"
#include "CTCPSocketFactory.h"
#include "XSocket.h"
#include "CThread.h"
#include "CEventQueue.h"
#include "CFunctionEventJob.h"
#include "CLog.h"
#include "CString.h"
#include "LogOutputters.h"
#include "CArch.h"
#include "XArch.h"
#include <cstring>
#define DAEMON_RUNNING(running_)
#if WINDOWS_LIKE
#include "CMSWindowsScreen.h"
#include "CArchMiscWindows.h"
#include "CMSWindowsClientTaskBarReceiver.h"
#include "resource.h"
#undef DAEMON_RUNNING
#define DAEMON_RUNNING(running_) CArchMiscWindows::daemonRunning(running_)
#elif UNIX_LIKE
#include "CXWindowsScreen.h"
#include "CXWindowsClientTaskBarReceiver.h"
#endif
// platform dependent name of a daemon
#if WINDOWS_LIKE
#define DAEMON_NAME "Synergy Client"
#elif UNIX_LIKE
#define DAEMON_NAME "synergyc"
#endif
//
// program arguments
//
#define ARG CArgs::s_instance
class CArgs {
public:
CArgs() :
m_pname(NULL),
m_backend(false),
m_restartable(true),
m_daemon(true),
m_logFilter(NULL)
{ s_instance = this; }
~CArgs() { s_instance = NULL; }
public:
static CArgs* s_instance;
const char* m_pname;
bool m_backend;
bool m_restartable;
bool m_daemon;
const char* m_logFilter;
CString m_name;
CNetworkAddress m_serverAddress;
};
CArgs* CArgs::s_instance = NULL;
//
// platform dependent factories
//
static
CScreen*
createScreen()
{
#if WINDOWS_LIKE
return new CScreen(new CMSWindowsScreen(false));
#elif UNIX_LIKE
return new CScreen(new CXWindowsScreen(false));
#endif
}
//
// platform independent main
//
static CClient* s_client = NULL;
static CScreen* s_clientScreen = NULL;
static CClientTaskBarReceiver* s_taskBarReceiver = NULL;
static double s_retryTime = 0.0;
static
void
updateStatus()
{
s_taskBarReceiver->updateStatus(s_client, "");
}
static
void
updateStatus(const CString& msg)
{
s_taskBarReceiver->updateStatus(s_client, msg);
}
static
void
resetRestartTimeout()
{
s_retryTime = 0.0;
}
static
double
nextRestartTimeout()
{
// 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 if (s_retryTime < 5.0) {
s_retryTime = 5.0;
}
else if (s_retryTime < 15.0) {
s_retryTime = 15.0;
}
else if (s_retryTime < 30.0) {
s_retryTime = 30.0;
}
else {
s_retryTime = 60.0;
}
return s_retryTime;
}
static
void
handleScreenError(const CEvent&, void*)
{
LOG((CLOG_CRIT "error on screen"));
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
static
CScreen*
openClientScreen()
{
CScreen* screen = createScreen();
EVENTQUEUE->adoptHandler(IScreen::getErrorEvent(),
screen->getEventTarget(),
new CFunctionEventJob(
&handleScreenError));
return screen;
}
static
void
closeClientScreen(CScreen* screen)
{
if (screen != NULL) {
EVENTQUEUE->removeHandler(IScreen::getErrorEvent(),
screen->getEventTarget());
delete screen;
}
}
static
void
handleClientRestart(const CEvent&, void* vtimer)
{
// discard old timer
CEventQueueTimer* timer = reinterpret_cast<CEventQueueTimer*>(vtimer);
EVENTQUEUE->deleteTimer(timer);
EVENTQUEUE->removeHandler(CEvent::kTimer, NULL);
// reconnect
s_client->connect();
updateStatus();
}
static
void
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 CFunctionEventJob(&handleClientRestart, timer));
}
static
void
handleClientConnected(const CEvent&, void*)
{
LOG((CLOG_DEBUG "connected to server"));
resetRestartTimeout();
updateStatus();
}
static
void
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 (!ARG->m_restartable || !info->m_retry) {
LOG((CLOG_ERR "failed to connect to server: %s", info->m_what));
}
else {
LOG((CLOG_WARN "failed to connect to server: %s", info->m_what));
scheduleClientRestart(nextRestartTimeout());
}
}
static
void
handleClientDisconnected(const CEvent&, void*)
{
LOG((CLOG_NOTE "disconnected from server"));
if (!ARG->m_restartable) {
EVENTQUEUE->addEvent(CEvent(CEvent::kQuit));
}
else {
s_client->connect();
}
updateStatus();
}
static
CClient*
openClient(const CString& name, const CNetworkAddress& address, CScreen* screen)
{
CClient* client = new CClient(name, address,
new CTCPSocketFactory, NULL, screen);
EVENTQUEUE->adoptHandler(CClient::getConnectedEvent(),
client->getEventTarget(),
new CFunctionEventJob(handleClientConnected));
EVENTQUEUE->adoptHandler(CClient::getConnectionFailedEvent(),
client->getEventTarget(),
new CFunctionEventJob(handleClientFailed));
EVENTQUEUE->adoptHandler(CClient::getDisconnectedEvent(),
client->getEventTarget(),
new CFunctionEventJob(handleClientDisconnected));
return client;
}
static
void
closeClient(CClient* client)
{
if (client == NULL) {
return;
}
EVENTQUEUE->removeHandler(CClient::getConnectedEvent(), client);
EVENTQUEUE->removeHandler(CClient::getConnectionFailedEvent(), client);
EVENTQUEUE->removeHandler(CClient::getDisconnectedEvent(), client);
delete client;
}
static
bool
startClient()
{
double retryTime;
CScreen* clientScreen = NULL;
try {
clientScreen = openClientScreen();
s_client = openClient(ARG->m_name,
ARG->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 (ARG->m_restartable) {
scheduleClientRestart(retryTime);
return true;
}
else {
// don't try again
return false;
}
}
static
void
stopClient()
{
closeClient(s_client);
closeClientScreen(s_clientScreen);
s_client = NULL;
s_clientScreen = NULL;
}
static
int
realMain()
{
// start the client. if this return false then we've failed and
// we shouldn't retry.
LOG((CLOG_DEBUG1 "starting client"));
if (!startClient()) {
return kExitFailed;
}
// run event loop. if startClient() failed we're supposed to retry
// later. the timer installed by startClient() will take care of
// that.
DAEMON_RUNNING(true);
CEvent event;
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
void
realMainEntry(void* vresult)
{
*reinterpret_cast<int*>(vresult) = realMain();
}
static
int
runMainInThread(void)
{
int result = 0;
CThread appThread(new CFunctionJob(&realMainEntry, &result));
try {
#if WINDOWS_LIKE
MSG msg;
while (appThread.waitForEvent(-1.0) == CThread::kEvent) {
// check for a quit event
if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
if (msg.message == WM_QUIT) {
CThread::getCurrentThread().cancel();
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
#else
appThread.wait(-1.0);
#endif
return result;
}
catch (XThread&) {
appThread.cancel();
appThread.wait(-1.0);
throw;
}
}
*/
//
// command line parsing
//
#define BYE "\nTry `%s --help' for more information."
static void (*bye)(int) = &exit;
static
void
version()
{
LOG((CLOG_PRINT "%s %s, protocol version %d.%d\n%s",
ARG->m_pname,
kVersion,
kProtocolMajorVersion,
kProtocolMinorVersion,
kCopyright));
}
static
void
help()
{
LOG((CLOG_PRINT
"Usage: %s"
" [--daemon|--no-daemon]"
" [--debug <level>]"
" [--name <screen-name>]"
" [--restart|--no-restart]"
" <server-address>\n"
"\n"
"Start the synergy mouse/keyboard sharing server.\n"
"\n"
" -d, --debug <level> filter out log messages with priorty below level.\n"
" level may be: FATAL, ERROR, WARNING, NOTE, INFO,\n"
" DEBUG, DEBUG1, DEBUG2.\n"
" -f, --no-daemon run the client in the foreground.\n"
"* --daemon run the client as a daemon.\n"
" -n, --name <screen-name> use screen-name instead the hostname to identify\n"
" ourself to the server.\n"
" -1, --no-restart do not try to restart the client if it fails for\n"
" some reason.\n"
"* --restart restart the client automatically if it fails.\n"
" -h, --help display this help and exit.\n"
" --version display version information and exit.\n"
"\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"
"\n"
"Where log messages go depends on the platform and whether or not the\n"
"client is running as a daemon.",
ARG->m_pname, kDefaultPort));
}
static
bool
isArg(int argi, int argc, const char* const* argv,
const char* name1, const char* name2,
int minRequiredParameters = 0)
{
if ((name1 != NULL && strcmp(argv[argi], name1) == 0) ||
(name2 != NULL && strcmp(argv[argi], name2) == 0)) {
// match. check args left.
if (argi + minRequiredParameters >= argc) {
LOG((CLOG_PRINT "%s: missing arguments for `%s'" BYE,
ARG->m_pname, argv[argi], ARG->m_pname));
bye(kExitArgs);
}
return true;
}
// no match
return false;
}
static
void
parse(int argc, const char* const* argv)
{
assert(ARG->m_pname != NULL);
assert(argv != NULL);
assert(argc >= 1);
// set defaults
ARG->m_name = ARCH->getHostName();
// parse options
int i;
for (i = 1; i < argc; ++i) {
if (isArg(i, argc, argv, "-d", "--debug", 1)) {
// change logging level
ARG->m_logFilter = argv[++i];
}
else if (isArg(i, argc, argv, "-n", "--name", 1)) {
// save screen name
ARG->m_name = argv[++i];
}
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, "-f", "--no-daemon")) {
// not a daemon
ARG->m_daemon = false;
}
else if (isArg(i, argc, argv, NULL, "--daemon")) {
// daemonize
ARG->m_daemon = true;
}
else if (isArg(i, argc, argv, "-1", "--no-restart")) {
// don't try to restart
ARG->m_restartable = false;
}
else if (isArg(i, argc, argv, NULL, "--restart")) {
// try to restart
ARG->m_restartable = true;
}
else if (isArg(i, argc, argv, "-z", NULL)) {
ARG->m_backend = true;
}
else if (isArg(i, argc, argv, "-h", "--help")) {
help();
bye(kExitSuccess);
}
else if (isArg(i, argc, argv, NULL, "--version")) {
version();
bye(kExitSuccess);
}
else if (isArg(i, argc, argv, "--", NULL)) {
// remaining arguments are not options
++i;
break;
}
else if (argv[i][0] == '-') {
LOG((CLOG_PRINT "%s: unrecognized option `%s'" BYE,
ARG->m_pname, argv[i], ARG->m_pname));
bye(kExitArgs);
}
else {
// this and remaining arguments are not options
break;
}
}
// exactly one non-option argument (server-address)
if (i == argc) {
LOG((CLOG_PRINT "%s: a server address or name is required" BYE,
ARG->m_pname, ARG->m_pname));
bye(kExitArgs);
}
if (i + 1 != argc) {
LOG((CLOG_PRINT "%s: unrecognized option `%s'" BYE,
ARG->m_pname, argv[i], ARG->m_pname));
bye(kExitArgs);
}
// save server address
try {
ARG->m_serverAddress = CNetworkAddress(argv[i], kDefaultPort);
}
catch (XSocketAddress& e) {
LOG((CLOG_PRINT "%s: %s" BYE,
ARG->m_pname, e.what(), ARG->m_pname));
bye(kExitFailed);
}
// increase default filter level for daemon. the user must
// explicitly request another level for a daemon.
if (ARG->m_daemon && ARG->m_logFilter == NULL) {
#if WINDOWS_LIKE
if (CArchMiscWindows::isWindows95Family()) {
// windows 95 has no place for logging so avoid showing
// the log console window.
ARG->m_logFilter = "FATAL";
}
else
#endif
{
ARG->m_logFilter = "NOTE";
}
}
// set log filter
if (!CLOG->setFilter(ARG->m_logFilter)) {
LOG((CLOG_PRINT "%s: unrecognized log level `%s'" BYE,
ARG->m_pname, ARG->m_logFilter, ARG->m_pname));
bye(kExitArgs);
}
}
//
// platform dependent entry points
//
#if WINDOWS_LIKE
static bool s_hasImportantLogMessages = false;
//
// CMessageBoxOutputter
//
// This class writes severe log messages to a message box
//
class CMessageBoxOutputter : public ILogOutputter {
public:
CMessageBoxOutputter() { }
virtual ~CMessageBoxOutputter() { }
// ILogOutputter overrides
virtual void open(const char*) { }
virtual void close() { }
virtual bool write(ELevel level, const char* message);
virtual const char* getNewline() const { return ""; }
};
bool
CMessageBoxOutputter::write(ELevel level, const char* message)
{
// note any important messages the user may need to know about
if (level <= CLog::kWARNING) {
s_hasImportantLogMessages = true;
}
// FATAL and PRINT messages get a dialog box if not running as
// backend. if we're running as a backend the user will have
// a chance to see the messages when we exit.
if (!ARG->m_backend && level <= CLog::kFATAL) {
MessageBox(NULL, message, ARG->m_pname, MB_OK | MB_ICONWARNING);
return false;
}
else {
return true;
}
}
static
void
byeThrow(int x)
{
CArchMiscWindows::daemonFailed(x);
}
static
int
daemonStartup(int argc, const char** argv)
{
CSystemLogger sysLogger(DAEMON_NAME);
// have to cancel this thread to quit
s_taskBarReceiver->setQuitJob(new CQuitJob(CThread::getCurrentThread()));
// catch errors that would normally exit
bye = &byeThrow;
// parse command line
parse(argc, argv);
// cannot run as backend if running as a service
ARG->m_backend = false;
// run as a service
return CArchMiscWindows::runDaemon(realMain);
}
static
int
daemonStartup95(int, const char**)
{
CSystemLogger sysLogger(DAEMON_NAME);
return runMainInThread();
}
static
int
run(int argc, char** argv)
{
// windows NT family starts services using no command line options.
// since i'm not sure how to tell the difference between that and
// a user providing no options we'll assume that if there are no
// arguments and we're on NT then we're being invoked as a service.
// users on NT can use `--daemon' or `--no-daemon' to force us out
// of the service code path.
if (argc <= 1 && !CArchMiscWindows::isWindows95Family()) {
try {
return ARCH->daemonize(DAEMON_NAME, &daemonStartup);
}
catch (XArchDaemon& e) {
LOG((CLOG_CRIT "failed to start as a service: %s" BYE, e.what().c_str(), ARG->m_pname));
}
return kExitFailed;
}
// parse command line
parse(argc, argv);
// daemonize if requested
if (ARG->m_daemon) {
// start as a daemon
if (CArchMiscWindows::isWindows95Family()) {
try {
return ARCH->daemonize(DAEMON_NAME, &daemonStartup95);
}
catch (XArchDaemon& e) {
LOG((CLOG_CRIT "failed to start as a service: %s" BYE, e.what().c_str(), ARG->m_pname));
}
return kExitFailed;
}
else {
// cannot start a service from the command line so just
// run normally (except with log messages redirected).
CSystemLogger sysLogger(DAEMON_NAME);
return runMainInThread();
}
}
else {
// run
return runMainInThread();
}
}
int WINAPI
WinMain(HINSTANCE instance, HINSTANCE, LPSTR, int)
{
CArch arch(instance);
CLOG;
CArgs args;
// save instance
CMSWindowsScreen::init(instance);
// get program name
ARG->m_pname = ARCH->getBasename(__argv[0]);
// send PRINT and FATAL output to a message box
CLOG->insert(new CMessageBoxOutputter);
// save log messages
CBufferedLogOutputter logBuffer(1000);
CLOG->insert(&logBuffer, true);
// make the task bar receiver. the user can control this app
// through the task bar.
s_taskBarReceiver = new CMSWindowsClientTaskBarReceiver(instance,
&logBuffer);
s_taskBarReceiver->setQuitJob(new CQuitJob(CThread::getCurrentThread()));
int result;
try {
// run in foreground or as a daemon
result = run(__argc, __argv);
}
catch (...) {
// note that we don't rethrow thread cancellation. we'll
// be exiting soon so it doesn't matter. what we'd like
// is for everything after this try/catch to be in a
// finally block.
result = kExitFailed;
}
// done with task bar receiver
delete s_taskBarReceiver;
// done with log buffer
CLOG->remove(&logBuffer);
// let user examine any messages if we're running as a backend
// by putting up a dialog box before exiting.
if (ARG->m_backend && s_hasImportantLogMessages) {
char msg[1024];
msg[0] = '\0';
LoadString(instance, IDS_FAILED, msg, sizeof(msg) / sizeof(msg[0]));
MessageBox(NULL, msg, ARG->m_pname, MB_OK | MB_ICONWARNING);
}
delete CLOG;
return result;
}
#elif UNIX_LIKE
static
int
daemonStartup(int, const char**)
{
CSystemLogger sysLogger(DAEMON_NAME);
return realMain();
}
int
main(int argc, char** argv)
{
CArch arch;
CLOG;
// go really fast
CThread::getCurrentThread().setPriority(-14);
CSocketMultiplexer multiplexer;
CEventQueue eventQueue;
// get program name
CArgs args;
ARG->m_pname = ARCH->getBasename(argv[0]);
// make the task bar receiver. the user can control this app
// through the task bar.
s_taskBarReceiver = new CXWindowsClientTaskBarReceiver;
// parse command line
parse(argc, argv);
// daemonize if requested
int result;
if (ARG->m_daemon) {
try {
result = ARCH->daemonize(DAEMON_NAME, &daemonStartup);
}
catch (XArchDaemon&) {
LOG((CLOG_CRIT "failed to daemonize"));
result = kExitFailed;
}
}
else {
result = realMain();
}
// done with task bar receiver
delete s_taskBarReceiver;
return result;
}
#else
#error no main() for platform
#endif
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