barrier/client/client.cpp

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#include "CClient.h"
#include "CString.h"
#include "CLog.h"
#include "CCondVar.h"
#include "CLock.h"
#include "CMutex.h"
#include "CNetwork.h"
#include "CNetworkAddress.h"
#include "CPlatform.h"
#include "CThread.h"
#include "XThread.h"
#include "ProtocolTypes.h"
#include "Version.h"
#include <assert.h>
// platform dependent name of a daemon
#if defined(CONFIG_PLATFORM_WIN32)
#define DAEMON "service"
#define DAEMON_NAME "Synergy Client"
#elif defined(CONFIG_PLATFORM_UNIX)
#define DAEMON "daemon"
#define DAEMON_NAME "synergy"
#endif
//
// program arguments
//
static const char* pname = NULL;
static bool s_restartable = true;
static bool s_daemon = true;
static bool s_install = false;
static bool s_uninstall = false;
static const char* s_logFilter = NULL;
static CNetworkAddress s_serverAddress;
//
// logging thread safety
//
static CMutex* s_logMutex = NULL;
static void logLock(bool lock)
{
assert(s_logMutex != NULL);
if (lock) {
s_logMutex->lock();
}
else {
s_logMutex->unlock();
}
}
//
// platform independent main
//
static CClient* s_client = NULL;
static int realMain(CMutex* mutex)
{
try {
// initialize threading library
CThread::init();
// make logging thread safe
CMutex logMutex;
s_logMutex = &logMutex;
CLog::setLock(&logLock);
bool locked = true;
try {
// create client
s_client = new CClient("secondary"); // FIXME
// run client
if (mutex != NULL) {
mutex->unlock();
}
locked = false;
s_client->run(s_serverAddress);
locked = true;
if (mutex != NULL) {
mutex->lock();
}
// clean up
delete s_client;
s_client = NULL;
CNetwork::cleanup();
CLog::setLock(NULL);
s_logMutex = NULL;
}
catch (...) {
// clean up
if (!locked && mutex != NULL) {
mutex->lock();
}
delete s_client;
s_client = NULL;
CNetwork::cleanup();
CLog::setLock(NULL);
s_logMutex = NULL;
throw;
}
}
catch (XBase& e) {
log((CLOG_CRIT "failed: %s", e.what()));
return 16;
}
catch (XThread&) {
// terminated
return 1;
}
return 0;
}
static int restartMain()
{
return realMain(NULL);
}
// invoke realMain and wait for it. if s_restartable then keep
// restarting realMain until it returns a terminate code.
static int restartableMain()
{
if (s_restartable) {
CPlatform platform;
return platform.restart(restartMain, 16);
}
else {
return realMain(NULL);
}
}
//
// command line parsing
//
#define BYE "\nTry `%s --help' for more information."
static void (*bye)(int) = &exit;
static void version()
{
log((CLOG_PRINT
"%s %d.%d.%d, protocol version %d.%d\n"
"%s",
pname,
kMajorVersion,
kMinorVersion,
kReleaseVersion,
kProtocolMajorVersion,
kProtocolMinorVersion,
kCopyright));
}
static void help()
{
log((CLOG_PRINT
"Usage: %s"
" [--debug <level>]"
" [--"DAEMON"|--no-"DAEMON"]"
" [--restart|--no-restart]"
" [--install]"
" <server-address>\n"
"or\n"
" --uninstall\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"
" -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"
" --install install server as a "DAEMON".\n"
" --uninstall uninstall server "DAEMON".\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".",
pname, kDefaultPort));
}
static bool isArg(int argi,
int argc, const char** 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,
pname, argv[argi], pname));
bye(2);
}
return true;
}
// no match
return false;
}
static void parse(int argc, const char** argv)
{
assert(pname != NULL);
assert(argv != NULL);
assert(argc >= 1);
// parse options
int i;
for (i = 1; i < argc; ++i) {
if (isArg(i, argc, argv, "-d", "--debug", 1)) {
// change logging level
s_logFilter = argv[++i];
}
else if (isArg(i, argc, argv, "-f", "--no-"DAEMON)) {
// not a daemon
s_daemon = false;
}
else if (isArg(i, argc, argv, NULL, "--"DAEMON)) {
// daemonize
s_daemon = true;
}
else if (isArg(i, argc, argv, "-1", "--no-restart")) {
// don't try to restart
s_restartable = false;
}
else if (isArg(i, argc, argv, NULL, "--restart")) {
// try to restart
s_restartable = true;
}
else if (isArg(i, argc, argv, "-h", "--help")) {
help();
bye(0);
}
else if (isArg(i, argc, argv, NULL, "--version")) {
version();
bye(0);
}
else if (isArg(i, argc, argv, NULL, "--install")) {
#if !defined(CONFIG_PLATFORM_WIN32)
log((CLOG_PRINT "%s: `%s' not permitted on this platform" BYE,
pname, argv[i], pname));
bye(2);
#endif
s_install = true;
if (s_uninstall) {
log((CLOG_PRINT "%s: `--install' and `--uninstall'"
" are mutually exclusive" BYE,
pname, argv[i], pname));
bye(2);
}
}
else if (isArg(i, argc, argv, NULL, "--uninstall")) {
#if !defined(CONFIG_PLATFORM_WIN32)
log((CLOG_PRINT "%s: `%s' not permitted on this platform" BYE,
pname, argv[i], pname));
bye(2);
#endif
s_uninstall = true;
if (s_install) {
log((CLOG_PRINT "%s: `--install' and `--uninstall'"
" are mutually exclusive" BYE,
pname, argv[i], pname));
bye(2);
}
}
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,
pname, argv[i], pname));
bye(2);
}
else {
// this and remaining arguments are not options
break;
}
}
// exactly one non-option argument (server-address) unless using
// --uninstall.
if (s_uninstall) {
if (i != argc) {
log((CLOG_PRINT "%s: unrecognized option `%s' to `%s'" BYE,
pname, argv[i], pname,
s_install ? "--install" : "--uninstall"));
bye(2);
}
}
else {
if (i == argc) {
log((CLOG_PRINT "%s: a server address or name is required" BYE,
pname, pname));
bye(1);
}
if (i + 1 != argc) {
log((CLOG_PRINT "%s: unrecognized option `%s'" BYE,
pname, argv[i], pname));
bye(2);
}
// save server address
try {
s_serverAddress = CNetworkAddress(argv[i], kDefaultPort);
}
catch (XSocketAddress&) {
log((CLOG_PRINT "%s: invalid server address" BYE,
pname, pname));
bye(2);
}
}
// increase default filter level for daemon. the user must
// explicitly request another level for a daemon.
if (s_daemon && s_logFilter == NULL) {
#if defined(CONFIG_PLATFORM_WIN32)
if (CPlatform::isWindows95Family()) {
// windows 95 has no place for logging so avoid showing
// the log console window.
s_logFilter = "FATAL";
}
else
#endif
{
s_logFilter = "NOTE";
}
}
// set log filter
if (!CLog::setFilter(s_logFilter)) {
log((CLOG_PRINT "%s: unrecognized log level `%s'" BYE,
pname, s_logFilter, pname));
bye(2);
}
}
//
// platform dependent entry points
//
#if defined(CONFIG_PLATFORM_WIN32)
#include "CMSWindowsScreen.h"
static bool logMessageBox(int priority, const char* msg)
{
if (priority <= CLog::kFATAL) {
MessageBox(NULL, msg, pname, MB_OK | MB_ICONWARNING);
return true;
}
else {
return false;
}
}
static void byeThrow(int x)
{
throw CWin32Platform::CDaemonFailed(x);
}
static void daemonStop(void)
{
s_client->quit();
}
static int daemonStartup(IPlatform* iplatform,
int argc, const char** argv)
{
// get platform pointer
CWin32Platform* platform = static_cast<CWin32Platform*>(iplatform);
// catch errors that would normally exit
bye = &byeThrow;
// parse command line
s_install = false;
s_uninstall = false;
parse(argc, argv);
if (s_install || s_uninstall) {
// not allowed to install/uninstall from service
throw CWin32Platform::CDaemonFailed(1);
}
// run as a service
return platform->runDaemon(realMain, daemonStop);
}
static int daemonStartup95(IPlatform*, int, const char**)
{
return realMain(NULL);
}
static bool logDiscard(int, const char*)
{
return true;
}
static bool s_die = false;
static void checkParse(int e)
{
// anything over 1 means invalid args. 1 means missing args.
// 0 means graceful exit. we plan to exit for anything but
// 1 (missing args); the service control manager may supply
// the missing arguments so we don't exit in that case.
s_die = (e != 1);
throw s_die;
}
int WINAPI WinMain(HINSTANCE instance, HINSTANCE, LPSTR, int)
{
CPlatform platform;
// save instance
CMSWindowsScreen::init(instance);
// get program name
pname = platform.getBasename(__argv[0]);
// initialize network library
CNetwork::init();
// parse command line without reporting errors but recording if
// the app would've exited. this is too avoid showing a dialog
// box if we're being started as a service because we shouldn't
// take too long to startup in that case. this mostly works but
// will choke if the service control manager passes --install
// or --uninstall (but that's unlikely).
CLog::setOutputter(&logDiscard);
bye = &checkParse;
try {
parse(__argc, const_cast<const char**>(__argv));
}
catch (...) {
// ignore
}
// if we're not starting as an NT service then reparse the command
// line normally.
if (s_die || !s_daemon || s_install || s_uninstall ||
CWin32Platform::isWindows95Family()) {
// send PRINT and FATAL output to a message box
CLog::setOutputter(&logMessageBox);
// exit on bye
bye = &exit;
// reparse
parse(__argc, const_cast<const char**>(__argv));
}
// if starting as a daemon then we ignore the startup command line
// here. we'll parse the command line passed in when the service
// control manager calls us back.
else {
// do nothing
}
// install/uninstall
if (s_install) {
// get the full path to this program
TCHAR path[MAX_PATH];
if (GetModuleFileName(NULL, path,
sizeof(path) / sizeof(path[0])) == 0) {
log((CLOG_CRIT "cannot determine absolute path to program"));
return 16;
}
// construct the command line to start the service with
CString commandLine = "--"DAEMON;
if (s_restartable) {
commandLine += " --restart";
}
else {
commandLine += " --no-restart";
}
if (s_logFilter != NULL) {
commandLine += " --debug ";
commandLine += s_logFilter;
}
commandLine += " ";
commandLine += s_serverAddress.getHostname().c_str();
// install
if (!platform.installDaemon(DAEMON_NAME,
"Shares this system's mouse and keyboard with others.",
path, commandLine.c_str())) {
log((CLOG_CRIT "failed to install service"));
return 16;
}
log((CLOG_PRINT "installed successfully"));
return 0;
}
else if (s_uninstall) {
if (!platform.uninstallDaemon(DAEMON_NAME)) {
log((CLOG_CRIT "failed to uninstall service"));
return 16;
}
log((CLOG_PRINT "uninstalled successfully"));
return 0;
}
// daemonize if requested
int result;
if (s_daemon) {
if (CWin32Platform::isWindows95Family()) {
result = platform.daemonize(DAEMON_NAME, &daemonStartup95);
}
else {
result = platform.daemonize(DAEMON_NAME, &daemonStartup);
}
if (result == -1) {
log((CLOG_CRIT "failed to start as a service"));
return 16;
}
}
else {
result = restartableMain();
}
return result;
}
#elif defined(CONFIG_PLATFORM_UNIX)
static int daemonStartup(IPlatform*, int, const char**)
{
return restartableMain();
}
int main(int argc, char** argv)
{
CPlatform platform;
// get program name
pname = platform.getBasename(argv[0]);
// initialize network library
CNetwork::init();
// parse command line
parse(argc, const_cast<const char**>(argv));
// daemonize if requested
int result;
if (s_daemon) {
result = platform.daemonize(DAEMON_NAME, &daemonStartup);
if (result == -1) {
log((CLOG_CRIT "failed to daemonize"));
return 16;
}
}
else {
result = restartableMain();
}
return result;
}
#else
#error no main() for platform
#endif