Mercurial > hg > trac > TreeVNC > TreeVNC
view src/main/java/jp/ac/u_ryukyu/treevnc/server/GetBroadCastProxy.java @ 126:775ce6a14f89
find root.
author | oc |
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date | Fri, 06 Jun 2014 19:17:32 +0900 |
parents | 40d400a7ec84 |
children |
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package jp.ac.u_ryukyu.treevnc.server; import java.io.IOException; import java.io.PrintStream; import java.net.DatagramPacket; import java.net.InetAddress; import java.net.MulticastSocket; import java.net.Socket; import java.net.SocketAddress; import java.net.UnknownHostException; import jp.ac.u_ryukyu.treevnc.client.TreeVncProtocol; import com.glavsoft.rfb.protocol.ProtocolContext; import com.glavsoft.viewer.swing.ConnectionParams; //import TextBoxProxy; public class GetBroadCastProxy implements Runnable { public static final String McastAddr = "224.0.0.1"; static final int BufSize = 1024; private boolean stopFlag = false; private VncProxyService vps; public static String MULTICAST_FIND_TREEVNC_ROOT = "TREEVNC-who:"; private MulticastSocket soc; private String bCast; public GetBroadCastProxy(VncProxyService _vps,String desktopName,String host){ String myaddress = getMyAddress(); // getMyAddress is not always connectable eg. in private segment. vps = _vps; bCast = vps.getRfb().getAcceptPort()+":"+host+":" +desktopName+":"+myaddress+":"; } /** * To find TreeVNC root, a client sends me a multicast, reply our address to him. * It contains a port to receive, so multiple TREEVNC clients can run on a PC. */ private void replyToRootSearchMulticast() { byte[] buf = new byte[BufSize]; try { InetAddress mAddr = InetAddress.getByName(McastAddr); soc = new MulticastSocket(ConnectionParams.DEFAULT_VNC_ROOT_FINDER); DatagramPacket recvPacket = new DatagramPacket(buf, BufSize); soc.joinGroup(mAddr); while (!stopFlag) { soc.receive(recvPacket); // String address = getAddress(recvPacket.getSocketAddress()); byte[] reply = recvPacket.getData(); int len = recvPacket.getLength(); if (len != 12) { continue; } if ((reply[0]&0xff) != ProtocolContext.FIND_ROOT) { continue; } int port = 0; port = reply[8]; port = port * 256 + reply[9]; port = port * 256 + reply[10]; port = port * 256 + reply[11]; TreeVncProtocol t = new TreeVncProtocol("", port); try { t.findRootReply(getMyAddress(), vps.getRfb().getAcceptPort()); } catch (IOException e) { e.printStackTrace(); } if(stopFlag) break; } } catch (Exception e) { } } public int parse_code( byte[] bs,int offset,int len ) { int intval = 0; for( int i = offset; i < len ; i++ ) { if (bs[i]==0 ) return intval; intval = intval * 10 + ( bs[ i ] - '0' ); } return intval; } /** * To find me (TreeVNC root) ,a client send a broadcast with port number. * Send the parameter to connect to him. * The client's GetDataClient will receive this message. * * @param addr * @param port * @param str */ private void replyToClient(String addr, int port_,String str_) { final String address = addr; final int port = port_; final String str = str_; TreeVncProtocol t = new TreeVncProtocol("", port_); try { t.findRootReply(str_, port_); } catch (IOException e) { e.printStackTrace(); } Runnable sender = new Runnable() { public void run() { try { Thread.sleep(1000); Socket socket = new Socket(address, port); // This is a TCP stream to reply PrintStream os = new PrintStream(socket.getOutputStream()); os.println(str); os.print(Integer.toString(port)); os.close(); socket.close(); } catch (IOException e) { System.out.println("Connection faild"); } catch (InterruptedException e) { System.out.println("Connection faild"); } } }; new Thread(sender).start(); } private String getAddress(SocketAddress addr) { String str = addr.toString(); str = str.substring(1,str.indexOf(":")); return str; } public void run() { replyToRootSearchMulticast(); } public void setStopFlag(boolean stopFlag) { this.stopFlag = stopFlag; } public boolean isStopFlag() { return stopFlag; } /** * getLocalHost() returns hostname's address. It may not connectable, but * it gives readable hostname. Do not use it to connect. * @return */ String getMyAddress () { InetAddress addr = null; try { addr = InetAddress.getLocalHost(); } catch (UnknownHostException e) { return "localhost"; } return addr.getHostAddress(); } }