vncserver.cpp

realvnc是一个非常流行的远程控制程序

// NOTIFICATION HANDLING!

// Connect/disconnect notification
BOOL
vncServer::AddNotify(HWND hwnd)
{
	omni_mutex_lock l(m_clientsLock);

	// Add the window handle to the list
	m_notifyList.push_front(hwnd);

	return TRUE;
}

BOOL
vncServer::RemNotify(HWND hwnd)
{
	omni_mutex_lock l(m_clientsLock);

	// Remove the window handle from the list
	vncNotifyList::iterator i;
	for (i=m_notifyList.begin(); i!=m_notifyList.end(); i++)
	{
		if ((*i) == hwnd)
		{
			// Found the handle, so remove it
			m_notifyList.erase(i);
			return TRUE;
		}
	}

	return FALSE;
}

// Send a notification message
void
vncServer::DoNotify(UINT message, WPARAM wparam, LPARAM lparam)
{
	omni_mutex_lock l(m_clientsLock);

	// Send the given message to all the notification windows
	vncNotifyList::iterator i;
	for (i=m_notifyList.begin(); i!=m_notifyList.end(); i++)
	{
		PostMessage((*i), message, wparam, lparam);
	}
}

void
vncServer::UpdateMouse()
{
	vncClientList::iterator i;
	
	omni_mutex_lock l(m_clientsLock);

	// Post this mouse update to all the connected clients
	for (i = m_authClients.begin(); i != m_authClients.end(); i++)
	{
		// Post the update
		GetClient(*i)->UpdateMouse();
	}
}

void
vncServer::UpdateClipText(const char* text)
{
	vncClientList::iterator i;
	
	omni_mutex_lock l(m_clientsLock);

	// Post this update to all the connected clients
	for (i = m_authClients.begin(); i != m_authClients.end(); i++)
	{
		// Post the update
		GetClient(*i)->UpdateClipText(text);
	}
}

void
vncServer::UpdatePalette()
{
	vncClientList::iterator i;
	
	omni_mutex_lock l(m_clientsLock);

	// Post this update to all the connected clients
	for (i = m_authClients.begin(); i != m_authClients.end(); i++)
	{
		// Post the update
		GetClient(*i)->UpdatePalette();
	}
}

void
vncServer::UpdateLocalFormat()
{
	vncClientList::iterator i;
	
	omni_mutex_lock l(m_clientsLock);

	// Post this update to all the connected clients
	for (i = m_authClients.begin(); i != m_authClients.end(); i++)
	{
		// Post the update
		GetClient(*i)->UpdateLocalFormat();
	}
}

void
vncServer::UpdateLocalClipText(LPSTR text)
{
	omni_mutex_lock l(m_desktopLock);

	if (m_desktop != NULL)
		m_desktop->SetClipText(text);
}

// Name and port number handling
void
vncServer::SetName(const char * name)
{
	// Set the name of the desktop
	if (m_name != NULL)
	{
		free(m_name);
		m_name = NULL;
	}
	
	m_name = strdup(name);
}

void
vncServer::SetPort(const UINT port)
{
    if (m_port != port)
    {
	/////////////////////////////////
	// Adjust the listen socket

	// Set the port number to use
	m_port = port;

	// If there is already a listening socket then close and re-open it...
	BOOL socketon = SockConnected();

	SockConnect(FALSE);
	if (socketon)
	    SockConnect(TRUE);

    }
}

UINT
vncServer::GetPort()
{
	return m_port;
}

void
vncServer::SetPassword(const char *passwd)
{
	memcpy(m_password, passwd, MAXPWLEN);
}

void
vncServer::GetPassword(char *passwd)
{
	memcpy(passwd, m_password, MAXPWLEN);
}

// Remote input handling
void
vncServer::EnableRemoteInputs(BOOL enable)
{
	m_enable_remote_inputs = enable;
}

BOOL vncServer::RemoteInputsEnabled()
{
	return m_enable_remote_inputs;
}

// Local input handling
void
vncServer::DisableLocalInputs(BOOL disable)
{
	m_disable_local_inputs = disable;
}

BOOL vncServer::LocalInputsDisabled()
{
	return m_disable_local_inputs;
}

// Socket connection handling
BOOL
vncServer::SockConnect(BOOL On)
{
	// Are we being asked to switch socket connects on or off?
	if (On)
	{
		// Is there a listening socket?
		if (m_socketConn == NULL)
		{
			m_socketConn = new vncSockConnect();
			if (m_socketConn == NULL)
				return FALSE;

			// Are we to use automatic port selection?
			if (m_autoportselect)
			{
				BOOL ok = FALSE;

				// Yes, so cycle through the ports, looking for a free one!
				for (int i=0; i < 99; i++)
				{
					m_port = DISPLAY_TO_PORT(i);

					vnclog.Print(LL_CLIENTS, VNCLOG("trying port number %d\n"), m_port);

					// Attempt to connect to the port
					VSocket tempsock;
					if (tempsock.Create())
					{
						if (!tempsock.Connect("localhost", m_port))
						{
							// Couldn't connect, so this port is probably usable!
							if (m_socketConn->Init(this, m_port))
							{
								ok = TRUE;
								break;
							}
						}
					}
				}

				if (!ok)
				{
					delete m_socketConn;
					m_socketConn = NULL;
					return FALSE;
				}
			} else
			{
				// No autoportselect
				if (!m_socketConn->Init(this, m_port))
				{
					delete m_socketConn;
					m_socketConn = NULL;
					return FALSE;
				}
			}

			// Now let's start the HTTP connection stuff
			EnableHTTPConnect(m_enableHttpConn);
		}
	}
	else
	{
		// *** JNW - Trying to fix up a lock-up when the listening socket closes
		KillAuthClients();
		KillUnauthClients();
		WaitUntilAuthEmpty();
		WaitUntilUnauthEmpty();

		// Is there a listening socket?
		if (m_socketConn != NULL)
		{
			// Close the socket
			delete m_socketConn;
			m_socketConn = NULL;
		}

		// Is there an HTTP socket active?
		EnableHTTPConnect(m_enableHttpConn);
	}

	return TRUE;
}

BOOL
vncServer::SockConnected()
{
	return m_socketConn != NULL;
}

BOOL
vncServer::EnableHTTPConnect(BOOL enable) {
	m_enableHttpConn = enable;
	if (enable && m_socketConn) {
		if (m_httpConn == NULL)
		{
			m_httpConn = new vncHTTPConnect;
			if (m_httpConn != NULL)
			{
				// Start up the HTTP server
				if (!m_httpConn->Init(this,
				    PORT_TO_DISPLAY(m_port) + HTTP_PORT_OFFSET))
				{
					delete m_httpConn;
					m_httpConn = NULL;
					return FALSE;
				}
			}
		}
	} else {
		if (m_httpConn != NULL)
		{
			// Close the socket
			delete m_httpConn;
			m_httpConn = NULL;
		}
	}

	return TRUE;
}

BOOL
vncServer::SetLoopbackOnly(BOOL loopbackOnly)
{
	if (loopbackOnly != m_loopbackOnly)
	{
		m_loopbackOnly = loopbackOnly;
		BOOL socketConn = SockConnected();
		SockConnect(FALSE);
		SockConnect(socketConn);
	}
	return TRUE;
}

BOOL
vncServer::LoopbackOnly()
{
	return m_loopbackOnly;
}

// CORBA connection handling
BOOL
vncServer::CORBAConnect(BOOL On)
{
	// Are we being asked to switch CORBA connects on or off?
	if (On)
	{
		// Is there a CORBA object?
		if (m_corbaConn == NULL)
		{
			m_corbaConn = new vncCorbaConnect();
		}
		if (m_corbaConn == NULL)
			return FALSE;
		if (!m_corbaConn->Init(this))
		{
			delete m_corbaConn;
			m_corbaConn = NULL;
			return FALSE;
		}
	}
	else
	{
		// Is there a listening socket?
		if (m_corbaConn != NULL)
		{
			// Close the socket
			delete m_corbaConn;
			m_corbaConn = NULL;
		}
	}

	return TRUE;
}

BOOL
vncServer::CORBAConnected()
{
	return m_corbaConn != NULL;
}

void
vncServer::GetScreenInfo(int &width, int &height, int &depth)
{
	rfbServerInitMsg scrinfo;

	omni_mutex_lock l(m_desktopLock);

	vnclog.Print(LL_INTINFO, VNCLOG("GetScreenInfo called\n"));

	// Is a desktop object currently active?
	if (m_desktop == NULL)
	{
		vncDesktop desktop;

		// No, so create a dummy desktop and interrogate it
		if (!desktop.Init(this))
		{
			scrinfo.framebufferWidth = 0;
			scrinfo.framebufferHeight = 0;
			scrinfo.format.bitsPerPixel = 0;
		}
		else
		{
			desktop.FillDisplayInfo(&scrinfo);
		}
	}
	else
	{
		m_desktop->FillDisplayInfo(&scrinfo);
	}

	// Get the info from the scrinfo structure
	width = scrinfo.framebufferWidth;
	height = scrinfo.framebufferHeight;
	depth = scrinfo.format.bitsPerPixel;
}

void
vncServer::SetAuthHosts(const char*hostlist) {
	omni_mutex_lock l(m_clientsLock);

	if (hostlist == 0) {
		vnclog.Print(LL_INTINFO, VNCLOG("authhosts cleared\n"));
		m_auth_hosts = 0;
		return;
	}

	vnclog.Print(LL_INTINFO, VNCLOG("authhosts set to \"%s\"\n"), hostlist);
	if (m_auth_hosts != 0)
		free(m_auth_hosts);

	m_auth_hosts = strdup(hostlist);
}

char*
vncServer::AuthHosts() {
	omni_mutex_lock l(m_clientsLock);

	if (m_auth_hosts == 0)
		return strdup("");
	else
		return strdup(m_auth_hosts);
}

inline BOOL
MatchStringToTemplate(const char *addr, UINT addrlen,
				      const char *filtstr, UINT filtlen) {
	if (filtlen == 0)
		return 1;
	if (addrlen < filtlen)
		return 0;
	for (int x = 0; x < filtlen; x++) {
		if (addr[x] != filtstr[x])
			return 0;
	}
	if ((addrlen > filtlen) && (addr[filtlen] != '.'))
		return 0;
	return 1;
}

vncServer::AcceptQueryReject
vncServer::VerifyHost(const char *hostname) {
	omni_mutex_lock l(m_clientsLock);

	// -=- Is the specified host blacklisted?
	vncServer::BlacklistEntry	*current = m_blacklist;
	vncServer::BlacklistEntry	*previous = 0;
	SYSTEMTIME					systime;
	FILETIME					ftime;
	LARGE_INTEGER				now;

	// Get the current time as a 64-bit value
	GetSystemTime(&systime);
	SystemTimeToFileTime(&systime, &ftime);
	now.LowPart=ftime.dwLowDateTime;now.HighPart=ftime.dwHighDateTime;
	now.QuadPart /= 10000000; // Convert it into seconds

	while (current) {

		// Has the blacklist entry timed out?
		if ((now.QuadPart - current->_lastRefTime.QuadPart) > 0) {

			// Yes.  Is it a "blocked" entry?
			if (current->_blocked) {
				// Yes, so unblock it & re-set the reference time
				current->_blocked = FALSE;
				current->_lastRefTime.QuadPart = now.QuadPart + 10;
			} else {
				// No, so remove it
				if (previous)
					previous->_next = current->_next;
				else
					m_blacklist = current->_next;
				vncServer::BlacklistEntry *next = current->_next;
				free(current->_machineName);
				delete current;
				current = next;
				continue;
			}

		}

		// Is this the entry we're interested in?
		if ((strcmp(current->_machineName, hostname) == 0) &&
			(current->_blocked)) {
			// Machine is blocked, so just reject it
			return vncServer::aqrReject;
		}

		previous = current;
		current = current->_next;
	}

	// Has a hostname been specified?
	if (hostname == 0) {
		vnclog.Print(LL_INTWARN, VNCLOG("verify failed - null hostname\n"));
		return vncServer::aqrReject;
	}

	// Set the state machine into the correct mode & process the filter
	enum vh_Mode {vh_ExpectDelimiter, vh_ExpectIncludeExclude, vh_ExpectPattern};
	vh_Mode machineMode = vh_ExpectIncludeExclude;
	
	vncServer::AcceptQueryReject verifiedHost = vncServer::aqrAccept;

	vncServer::AcceptQueryReject patternType = vncServer::aqrReject;
	UINT authHostsPos = 0;
	UINT patternStart = 0;
	UINT hostNameLen = strlen(hostname);

	// Run through the auth hosts string until we hit the end
	if (m_auth_hosts) {
		while (1) {

			// Which mode are we in?
			switch (machineMode) {

				// ExpectIncludeExclude - we should see a + or -.
			case vh_ExpectIncludeExclude:
				if (m_auth_hosts[authHostsPos] == '+') {
					patternType = vncServer::aqrAccept;
					patternStart = authHostsPos+1;
					machineMode = vh_ExpectPattern;
				} else if (m_auth_hosts[authHostsPos] == '-') {	
					patternType = vncServer::aqrReject;
					patternStart = authHostsPos+1;
					machineMode = vh_ExpectPattern;
				} else if (m_auth_hosts[authHostsPos] == '?') {	
					patternType = vncServer::aqrQuery;
					patternStart = authHostsPos+1;
					machineMode = vh_ExpectPattern;
				} else if (m_auth_hosts[authHostsPos] != '\0') {
					vnclog.Print(LL_INTWARN, VNCLOG("verify host - malformed AuthHosts string\n"));
					machineMode = vh_ExpectDelimiter;
				}
				break;

				// ExpectPattern - we expect to see a valid pattern
			case vh_ExpectPattern:
				// ExpectDelimiter - we're scanning for the next ':', skipping a pattern
			case vh_ExpectDelimiter:
				if ((m_auth_hosts[authHostsPos] == ':') ||
					(m_auth_hosts[authHostsPos] == '\0')) {
					if (machineMode == vh_ExpectPattern) {
						if (patternStart == 0) {
							vnclog.Print(LL_INTWARN, VNCLOG("verify host - pattern processing failed!\n"));
						} else {
							// Process the match
							if (MatchStringToTemplate(hostname, hostNameLen,
								&(m_auth_hosts[patternStart]), authHostsPos-patternStart)) {
								// The hostname matched - apply the include/exclude rule
								verifiedHost = patternType;
							}
						}
					}

					// We now expect another + or -
					machineMode = vh_ExpectIncludeExclude;
				}
				break;
			}

			// Have we hit the end of the pattern string?
			if (m_auth_hosts[authHostsPos] == '\0')
				break;
			authHostsPos++;
		}
	}

	// Based on the server's QuerySetting, adjust the verification result
	switch (verifiedHost) {
	case vncServer::aqrAccept:
		if (QuerySetting() >= 3)
			verifiedHost = vncServer::aqrQuery;
		break;
	case vncServer::aqrQuery:
		if (QuerySetting() <= 1)
			verifiedHost = vncServer::aqrAccept;
		else if (QuerySetting() == 4)
			verifiedHost = vncServer::aqrReject;
		break;
	case vncServer::aqrReject:
		if (QuerySetting() == 0)
			verifiedHost = vncServer::aqrQuery;
		break;
	};

	return verifiedHost;
}

void
vncServer::AddAuthHostsBlacklist(const char *machine) {
	omni_mutex_lock l(m_clientsLock);

	// -=- Is the specified host blacklisted?
	vncServer::BlacklistEntry	*current = m_blacklist;

	// Get the current time as a 64-bit value
	SYSTEMTIME					systime;
	FILETIME					ftime;
	LARGE_INTEGER				now;
	GetSystemTime(&systime);
	SystemTimeToFileTime(&systime, &ftime);
	now.LowPart=ftime.dwLowDateTime;now.HighPart=ftime.dwHighDateTime;
	now.QuadPart /= 10000000; // Convert it into seconds

	while (current) {

		// Is this the entry we're interested in?
		if (strcmp(current->_machineName, machine) == 0) {

			// If the host is already blocked then ignore
			if (current->_blocked)
				return;

			// Set the RefTime & failureCount
			current->_lastRefTime.QuadPart = now.QuadPart + 10;
			current->_failureCount++;

			if (current->_failureCount > 5)
				current->_blocked = TRUE;
			return;
		}

		current = current->_next;
	}

	// Didn't find the entry
	current = new vncServer::BlacklistEntry;
	current->_blocked = FALSE;
	current->_failureCount = 0;
	current->_lastRefTime.QuadPart = now.QuadPart + 10;
	current->_machineName = strdup(machine);
	current->_next = m_blacklist;
	m_blacklist = current;
}

void
vncServer::RemAuthHostsBlacklist(const char *machine) {
	omni_mutex_lock l(m_clientsLock);

	// -=- Is the specified host blacklisted?
	vncServer::BlacklistEntry	*current = m_blacklist;
	vncServer::BlacklistEntry	*previous = 0;

	while (current) {

		// Is this the entry we're interested in?
		if (strcmp(current->_machineName, machine) == 0) {
			if (previous)
				previous->_next = current->_next;
			else
				m_blacklist = current->_next;
			vncServer::BlacklistEntry *next = current->_next;
			free (current->_machineName);
			delete current;
			current = next;
			continue;
		}

		previous = current;
		current = current->_next;
	}
}