Wireshark connectivity using java and string compare from text file

[Riddhi Kakadia]

Hi All,

I am trying to write a code which does following things:

1. capture wireshark traces
2. convert pcap file to text file
3. search string from that text file
4. stop taking wireshark traces

I have implemented it as below:

public void startWiresharkCapture(String filename, int i) throws Exception
	{	
		try
		{
				sout("Starting wireshark traces");
				
				String line;
				String execStr = "C:\\Program Files\\Wireshark\\tshark.exe -i 2 -a duration:"+i;                       
				File file = new File("C:\\"+filename);
				Writer output = new BufferedWriter(new FileWriter(file));
				sout(execStr);
				Runtime rt = Runtime.getRuntime() ;
			    Process p = rt.exec(execStr);                                        //problem here
				
sout("command executed....");
				
				BufferedReader bri = new BufferedReader (new InputStreamReader(p.getInputStream()));
				
				while ((line = bri.readLine()) != null) 
				{				
					output.append(line+"\n");				
				}
				output.close();
				bri.close();
				
				p.destroy();
			
		}
		catch(Exception exc)
		{
			exc.printStackTrace();
			System.out.println("Error running wireshark");
		}
	}

public boolean WiresharkTextFound(String filename, String text) throws Exception{
		
		BufferedReader br = new BufferedReader(new FileReader("C:\\"+filename));
		String line;
		while((line=br.readLine())!=null)
		{
			if(line.contains(text))
				return true;
		}
		
		return false;
	}

The problem is with line //problem here. I want to run traces in background.
I want to modify the above code so that,

-->start wireshark traces
-->do something like (open browser and open webpage)
-->stop wireshark
-->compare

But the problem is that //it does not go out from the //problem here line. and so i cannot go to the next step. Any ideas on implementation?

[Henry Wong]

Riddhi Kakadia wrote:

But the problem is that //it does not go out from the //problem here line. and so i cannot go to the next step. Any ideas on implementation?

Not sure if this question is even thread related.

Is the issue related with being able to call runtime.exec()? Or is the question about starting a thread to do so. If the first, then this is not a thread question. If the second, then what is the issue? The example doesn't start a separate thread at all.

Henry

[Ulf Dittmer]

Make sure you follow all the advice given in this article.