protocols/proxy.java at master · ratheep/protocols · GitHub

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import java.net.* ;

import java.io.* ;

import java.util.* ;

/* Comments would be added later

* - Ratheep

* */

class Logger

{

static PrintWriter out;

String loggerName;

boolean enabled;

private static HashMap<String,Logger> loggers=new HashMap<String,Logger>();

public static Logger logger(String loggername)

{

return loggers.get(loggername);

}

public static void file(String filename)

{

try

{

out=new PrintWriter(new FileWriter(filename),true);

}

catch(IOException ie)

{

System.err.println("File Error");

}

public static PrintWriter sys()

{

PrintWriter temp=out;

out=new PrintWriter(System.out,true);

return temp;

}

public Logger(String name)

{

loggerName=name;

loggers.put(name,this);

enable();

}

public void enable()

{

enabled=true;

}

public void disable()

{

enabled=false;

}

public void println(String toPrint)

{

if(enabled)

{

out.println(Thread.currentThread()+ " : " + loggerName + " : "+ toPrint);

out.flush();

}

public void write(byte[] bytes)

{

if(enabled)

{

out.println(Thread.currentThread()+" : "+loggerName + " : Bytes : \n" );

for(byte b:bytes)

out.print(b);

}

public static void close()

{

out.close();

}

public void finalize()

{

close();

}

//////////////////////////////////////////////////////////////////////////////////////////////////////

class Headers

{

ArrayList <String> keys ;

HashMap<String,String> headers ;

Logger log=new Logger("Headers");

public Headers()

{

keys = new ArrayList<String>();

headers = new HashMap<String,String>();

}

public void parse(BufferedReader br)

{

String headerLine;

try

{

while((headerLine=br.readLine())!=null )

{

if( headerLine.equals("")) break;

String [] hdrWords = headerLine.split(":",2);

headers.put(hdrWords[0],hdrWords[1].trim());

keys.add(hdrWords[0]);

log.println("Parse: "+hdrWords[0]+ ": " +hdrWords[1]);

}

catch(IOException e)

{

log.println("IO at parse error");

}

public void copy(Headers hdrs)

{

headers.clear();

keys.clear();

for(String el: hdrs.keys)

{

//log.println(el + " " + hdrs.value(el) );

keys.add(el);

headers.put(el,hdrs.value(el));

}

public void print(PrintWriter pw)

{

for(String el:keys)

{

pw.print( el +": " + value(el)+ "\r\n" );

log.println("print: "+el + ": " + value(el) );

}

pw.flush();

}

public void clear()

{

headers.clear();

keys.clear();

}

public String value(String key)

{

String ret="";

String val=headers.get(key);

if(val!=null)

ret=val;

return ret;

}

public void modify(String key,String value)

{

keys.add(key);

headers.put(key,value);

}

class HTTPMessage

{

OutputStream netOut ;

InputStream netIn ;

ByteArrayInputStream bin ;

ByteArrayOutputStream bout ;

BufferedReader reader ;

PrintWriter writer ;

Headers headers;

boolean proxyAlive ;

boolean keepAlive ;

int messageLength ;

Socket remoteSocket ;

ByteArrayOutputStream bhex ;

String prefix ;

public boolean transferEncoding = false ;

public boolean tunneling = false ;

Logger log=new Logger("HTTPMessage");

public HTTPMessage(Socket socket)

{

remoteSocket= socket;

try

{

netIn = socket.getInputStream();

netOut = socket.getOutputStream();

}

catch(IOException e)

{

log.println("Socket Problem");

}

headers = new Headers();

}

public void readHeaderSection()

{

int n;

int n1=0;

int n2=0;

int n3=0;

byte[] bytes;

bout=new ByteArrayOutputStream();

try

{

while( (n=netIn.read()) !=-1)

{

bout.write(n);

if( n3==13 && n2==10 && n1==13 && n==10 )

{

break;

}

n3=n2;

n2=n1;

n1=n;

}

bout.flush();

}

catch(IOException e)

{

}

bytes=bout.toByteArray();

bin = new ByteArrayInputStream(bytes);

try

{

reader=new BufferedReader(new InputStreamReader(bin,"UTF-8"));

}

catch(Exception e)

{

log.println("Error Buffered reader creation");

}

public void writeHeaders()

{

headers.print(writer);

log.println("Written headers");

}

public void writeHeaderSection()

{

byte [] bytes;

writer.print("\r\n");

writer.flush();

bytes=bout.toByteArray();

try

{

netOut.write(bytes);

netOut.flush();

}

catch(IOException ie)

{

log.println("Request:writeHeaderSection");

}

public void writeMessage(InputStream in,int length)

{

int ch;

int count =0;

try

{

if(transferEncoding)

{

log.println("Entering Chunking");

int prevCh=0;

String lenStr="";

try

{

while((ch=in.read())!=-1)

{

log.println(""+ch);

if(prevCh==13 && ch==10)

{

log.println("broke");

break;

}

if(ch!=10 && ch!=13)

lenStr = lenStr+(char)ch;

prevCh = ch;

}

length = Integer.parseInt(lenStr,16);

String prefix=lenStr+"\r\n" ;

netOut.write(prefix.getBytes());

while(length!=0)

{

log.println("Chunking " + length);

count=0;

while( count != length &&(ch=in.read())!=-1 )

{

count ++;

netOut.write(ch );

}

netOut.flush();

lenStr="";

while((ch=in.read())!=-1)

{

netOut.write(ch);

if(prevCh==13 && ch==10)

{

log.println("broke");

break;

}

prevCh = ch;

}

while((ch=in.read())!=-1)

{

if(prevCh==13 && ch==10)

{

log.println("broke");

break;

}

if(ch!=10 && ch!=13)

lenStr = lenStr+(char)ch;

prevCh = ch;

}

length = Integer.parseInt(lenStr,16);

log.println("last len field " + length);

prefix=lenStr+"\r\n" ;

netOut.write(prefix.getBytes());

}

catch(IOException ie)

{

log.println("IO reading chunk len");

ie.printStackTrace();

}

else

{

log.println("Blocks at write message");

while( count != length &&(ch=in.read())!=-1 )

{

count ++;

netOut.write(ch );

netOut.flush();

}

System.out.println("count" + count);

netOut.flush();

log.println("UnBlocks at write message");

}

catch(IOException ie)

{

}

class HTTPRequest extends HTTPMessage

{

String version ;

String method ;

String url ;

public HTTPRequest(Socket socket)

{

super(socket);

log=new Logger("HTTPRequest");

}

public void readRequestLine()

{

try

{

log.println("Blocks");

String requestLine = reader.readLine();

log.println("Un Blocks");

log.println(requestLine);

String rlWords[] = requestLine.split("\\s",3);

method = rlWords[0].trim();

url = rlWords[1].trim();

version = rlWords[2].trim();

log.println("method : " + method);

log.println("Version : " + version);

log.println("url : " + url);

}

catch(IOException ie)

{

ie.printStackTrace();

}

public void readHeaders()

{

headers.parse(reader);

}

public void reset()

{

method=url=version=null;

headers.clear();

}

public int calculateLength()

{

boolean get = method.equals("GET");

boolean connect = method.equals("CONNECT");

boolean transfercoding = headers.value("Transfer-Encoding").equals("chunked");

String contLenStr = headers.value("Content-Length");

boolean contentLength = !contLenStr.equals("");

if(get)

{

messageLength=0;

}

else if(connect)

{

tunneling=true;

messageLength=0;

}

else if(transfercoding)

{

int ch;

int prevCh=0;

String lenStr="";

ByteArrayOutputStream bhex=new ByteArrayOutputStream() ;

transferEncoding=true;

try

{

while((ch=netIn.read())!=-1)

{

//\r\n = 13 10

if( ch==13 || ch==10) log.println("Number Error");

if(prevCh==13 && ch==10) break;

lenStr = lenStr+(char)ch;

bhex.write(ch);

prevCh = ch;

}

bhex.flush();

}

catch(IOException ie)

{

log.println("IO reading chunk len");

}

try

{

messageLength=Integer.parseInt(lenStr.trim(),16);

}catch(Exception e)

{

}

else if(contentLength)

{

messageLength=Integer.parseInt(contLenStr);

}

else

{

messageLength = -1;

}

return messageLength;

}

//////////////////writing

public void writeRequestLine()

{

bout = new ByteArrayOutputStream();

writer = new PrintWriter(bout);

String requestLine = method + " " + url + " " + version ;

writer.print(requestLine + "\r\n");

writer.flush();

log.println("Request: " + requestLine);

}

class HTTPResponse extends HTTPMessage

{

String code;

String reason;

String version;

int messageLength;

public HTTPResponse(Socket socket)

{

super(socket);

log=new Logger("HTTPResponse");

}

public void readStatusLine()

{

try

{

log.println("Blocks");

String statusLine = reader.readLine();

log.println("Un Blocks");

log.println(statusLine);

String rlWords[] = statusLine.split("\\s",3);

version = rlWords[0].trim();

code = rlWords[1].trim();

reason = rlWords[2].trim();

log.println("version : " + version );

log.println("reason : " + reason);

log.println("code : " + code);

}

catch(IOException ie)

{

ie.printStackTrace();

}

public void readHeaders()

{

headers.parse(reader);

}

public int calculateLength()

{

String contLenStr = headers.value("Content-Length");

boolean contentLength = !contLenStr.equals("");

boolean transfercoding = headers.value("Transfer-Encoding").equals("chunked");

boolean code100 = code.equals("100");

boolean code101 = code.equals("101");

boolean code204 = code.equals("204");

boolean code304 = code.equals("304");

if(code100||code101||code204||code304)

{

messageLength=0;

}

else if(contentLength)

{

messageLength=Integer.parseInt(contLenStr);

}

else if(transfercoding)

{

transferEncoding=true;

}

else

{

messageLength = -1;

}

return messageLength;

}

public void reset()

{

code=reason=version=null;

headers.clear();

}

public void writeStatusLine()

{

bout = new ByteArrayOutputStream();

writer = new PrintWriter(bout);

String statusLine = version + " " + code + " " + reason ;

writer.print(statusLine + "\r\n");

writer.flush();

log.println("Response Status Line Written: " + statusLine);

}

////////////////////////////////////////////////////////////////////////////////////////////////////////

class BidirectionalThread extends Thread

{

Socket inSocket;

Socket outSocket;

Logger log=new Logger("BidirectionalThread");

BidirectionalThread rc=null;

public BidirectionalThread()

{

}

public BidirectionalThread(Socket clientSock,Socket remoteSock)

{

inSocket = remoteSock;

outSocket = clientSock ;

BidirectionalThread bt=new BidirectionalThread();

bt.inSocket = clientSock;

bt.outSocket= remoteSock;

rc=bt;

bt.start();

bt.setName("C->R");

this.setName("R->C");

this.start();

}

public void run()

{

int ch;

try

{

log.println("Thread Started"+this);

InputStream in=inSocket.getInputStream();

OutputStream out=outSocket.getOutputStream();

while((ch=in.read())!=-1)

{

//System.err.print(""+ this + (char)ch);

out.write(ch);

}

if(rc!=null)

rc.terminate();

log.println("Thread Ended"+this);

}

catch(IOException ie)

{

ie.printStackTrace();

}

public void socketClose()

{

try

{

inSocket.close();

outSocket.close();

}

catch(Exception e)

{

e.printStackTrace();

}

public void terminate()

{

if(rc!=null)rc.socketClose();

//rc.stop();

}

class ThreadServer extends Thread

{

Socket clientSocket;

Socket remoteSocket;

Logger log=new Logger("ThreadServer");

public void copyBytes(InputStream in,OutputStream out,int length)

{

if(length == 0 ) return ;

if(length == -1)

{

int ch;

try

{

while((ch=in.read())!=-1)

{

out.write(ch);

}

catch(IOException e)

{

log.println("Copy");

}

public ThreadServer()

{

super();

this.start();

}

public ThreadServer(Socket clientSocket)

{

super();

this.clientSocket=clientSocket;

try

{

remoteSocket=new Socket("proxy.cognizant.com",6050);

}

catch(Exception e)

{

e.printStackTrace();

}

this.start();

}

public void run()

{

log.println("Run Called");

boolean keepAlive = false ;

boolean proxyKeepAlive = false ;

boolean alive = true ;

boolean remoteAlive = true ;

boolean remoteKeepAlive = false ;

HTTPRequest clientRequest =null;

HTTPResponse clientResponse =null;

HTTPRequest remoteRequest =null;

HTTPResponse remoteResponse =null;

while( alive )

{

if(!proxyKeepAlive)

{

clientRequest= new HTTPRequest(clientSocket);

clientResponse=new HTTPResponse(clientSocket);

}

else

{

clientRequest.reset();

}

if( !remoteKeepAlive )

{

remoteRequest= new HTTPRequest(remoteSocket);

remoteResponse = new HTTPResponse(remoteSocket);

}

clientRequest.readHeaderSection();

clientRequest.readRequestLine();

clientRequest.readHeaders();

int len=clientRequest.calculateLength();

remoteRequest.version=clientRequest.version;

remoteRequest.url=clientRequest.url;

remoteRequest.method=clientRequest.method;

//log.println("Calc Length=" +len );

remoteRequest.writeRequestLine();

remoteRequest.headers.copy(clientRequest.headers);

remoteRequest.writeHeaders();

remoteRequest.writeHeaderSection();

remoteRequest.writeMessage(clientRequest.netIn,len);

log.println("Request over");

log.println("Getting Response");

remoteResponse.readHeaderSection();

remoteResponse.readStatusLine();

remoteResponse.readHeaders();

log.println("Headers retrieved from remote response");

log.println("Writing to client");

clientResponse.code = remoteResponse.code;

clientResponse.version = remoteResponse.version;

clientResponse.reason = remoteResponse.reason;

clientResponse.writeStatusLine();

clientResponse.headers.copy(remoteResponse.headers);

//clientResponse.headers.modify("Proxy-Connection","Close");

clientResponse.writeHeaders();

clientResponse.writeHeaderSection();

boolean dontClose=false;

if(clientRequest.tunneling)

{

if(remoteResponse.code.equals("200"))

{

dontClose=true;

log.println("Entering Bidirectional Thread");

new BidirectionalThread(clientSocket,remoteSocket);

}

else

{

int len2=remoteResponse.calculateLength();

log.println("Remote Response Length=" + len2);

clientResponse.transferEncoding=remoteResponse.transferEncoding;

clientResponse.writeMessage(remoteResponse.netIn,len2);

}

int ch;

/*try

{

log.println("Blocks");

while((ch=remoteRequest.netIn.read())!=-1)

{

System.out.print((char)ch);

System.out.flush();

}

log.println("UnBlocks");

}

catch(IOException ie)

{

ie.printStackTrace();

}

log.println("Request Processed");

proxyKeepAlive=false;

alive=false;

try

{

if(!dontClose)

{

sleep(100);

clientSocket.close();

remoteSocket.close();

}

else

{

log.println("Bidirection Request Processed");

}

catch(InterruptedException ie)

{

}

catch(IOException ie)

{

ie.printStackTrace();

}

class proxy

{

ServerSocket serverSocket;

Logger log=new Logger("Proxy");

public proxy()

{

try

{

serverSocket=new ServerSocket(9090,5);

}

catch(Exception e)

{

e.printStackTrace();

}

public void process()

{

Socket clientSocket;

try

{

while((clientSocket= serverSocket.accept())!=null)

{

log.println("New Connection accepted");

ThreadServer ts=new ThreadServer(clientSocket);

}

catch(Exception e)

{

log.println("Error");

e.printStackTrace();

}

public static void main(String args[])

{

Logger log=new Logger("Main");

Logger.sys();

//Logger.file("test.log");

log.println("Starting");

proxy hs=new proxy();

hs.process();

Logger.close();

}

protocols/proxy.java at master · ratheep/protocols · GitHub

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