Information Technology Blogs

Regular Expression For IP Address Validator

2009-08-18T04:03:00.000-07:00

private boolean

validateAnIpAddressWithRegularExpression(String iPaddress){

final Pattern IP_PATTERN =

Pattern.compile("b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).)"

+ "{3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)b");

return IP_PATTERN.matcher(iPaddress).matches();

}

Importing outlook contacts in evolution

2009-08-18T03:05:00.000-07:00

1. Open outlook
2. Go to File -> Import and export
3. Select "Export to a file" from the menu and click "Next"
4. Select "Comma separated values" and click "Next"
5. Write down the file name and select "Allow duplicates to be created"
6. Select the folder you want to transfer ("Contacts" in this regard)
7. Click "Next" and click "Finish"

Now boot in Linux and run Evolution.
1. Go to File -> Import
2. Click "Forward"
3. Select "Import a single file" and click " Forward"
4. Browse for the file in the file menu and select it and click "Forward"
5. Select "Personal" and click "Forward"
6. Finally click "Import"

Generating SNMP Traps Using SNMP4j

2009-07-03T04:19:00.000-07:00

SNMP V1 Trap Generation

-------------------------------------------------------------------------------------------------

import java.io.ByteArrayOutputStream;
import java.net.InetAddress;
import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.PDUv1;
import org.snmp4j.Snmp;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.IpAddress;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.Variable;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.util.DefaultPDUFactory;

public class TrapGeneraterV1 {

public static void main(String args[]) {
try {
PDUv1 pdu = (PDUv1) DefaultPDUFactory.createPDU(SnmpConstants.version1);
pdu.setType(PDU.V1TRAP);
VariableBinding vb = new VariableBinding();
VariableBinding vb1 = new VariableBinding();
//OID oid=new OID(arg0);
vb.setOid(new OID("1.2.3.3.25.22.1"));
Variable v = new OctetString("Test Trap");
vb.setVariable(v);
vb1.setOid(new OID("1.2.3.3.25.22.1"));
Variable v1 = new OctetString("System 192.168.1.5 is Down ");
vb1.setVariable(v1);
pdu.setAgentAddress(new IpAddress(InetAddress.getLocalHost()));
pdu.add(vb);
pdu.add(vb1);
ByteArrayOutputStream out = new ByteArrayOutputStream();
pdu.encodeBER(out);
DefaultUdpTransportMapping tm = new DefaultUdpTransportMapping();
Snmp snmp = new Snmp(tm);
tm.listen();
OctetString community = new OctetString("public");
Address add = GenericAddress.parse("udp" + ":" + "192.168.1.246" + "/" + 162);
CommunityTarget target = new CommunityTarget(add, community);
target.setVersion(SnmpConstants.version1);
target.setRetries(0);
target.setTimeout(5000);
snmp.send(pdu, target);
} catch (Exception ex) {
ex.printStackTrace();
}

}
}

------------------------------------------------------------------------------------------------

SNMP V2 Traps Generation

import java.io.ByteArrayOutputStream;
import java.net.InetAddress;
import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.PDUv1;
import org.snmp4j.Snmp;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.IpAddress;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.Variable;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;
import org.snmp4j.util.DefaultPDUFactory;

public class TrapGeneraterV2 {

public static void main(String args[]) {
try {
PDU pdu = (PDU) DefaultPDUFactory.createPDU(SnmpConstants.version2c);
pdu.setType(PDU.TRAP);
VariableBinding vb = new VariableBinding();
//OID oid=new OID(arg0);
vb.setOid(new OID("1.2.3.3.25.22.1"));
Variable v = new OctetString("Test Trap");
vb.setVariable(v);

VariableBinding vb1 = new VariableBinding();
//OID oid=new OID(arg0);
vb1.setOid(new OID("1.2.3.3.25.22.1"));
Variable v1 = new OctetString("Device Unavailable IP : 192.168.1.61");
vb1.setVariable(v1);
pdu.add(vb1);
pdu.add(vb);

.setGenericTrap(SnmpConstants.getGenericTrapID(SnmpConstants.coldStart));

ByteArrayOutputStream out = new ByteArrayOutputStream();
pdu.encodeBER(out);

DefaultUdpTransportMapping tm = new DefaultUdpTransportMapping();
Snmp snmp = new Snmp(tm);
tm.listen();
OctetString community = new OctetString("public");
Address add = GenericAddress.parse("udp" + ":" + "192.168.1.246" + "/" + 162);
CommunityTarget target = new CommunityTarget(add, community);
target.setVersion(SnmpConstants.version2c);
target.setRetries(0);
target.setTimeout(5000);
snmp.send(pdu, target);

} catch (Exception ex) {
ex.printStackTrace();
}

}
}

SNMP DataTypes

2009-04-07T22:05:00.000-07:00

SNMP version 1 uses this following datatypes :

OBJECT IDENTIFIER

For a BIT STRING that is 32 bits less, turn it into a 32-bit INTEGER (calculating the number represented by the bits). If there are more than 32 bits, turn it into an OCTET STRING.

A few primitive datatypes , specific to SNMP applications, were added to the built-in primitives. These included :

Simple datatypes added to SNMP v2 :

³¹

³²

⁶⁴

³²

TCP/IP module missing in npqtplugin4.dll.it may be infected by virus

2009-03-17T21:55:00.000-07:00

TCP/IP module missing in npqtplugin4.dll.it may be infected by virus

Step1 : download mbam from www.malwarebytes.org ,install it and get updates.
Step2 : start scan using mbean ,it shows infected files and registry enties and removes them .
Step3 : it asks for restart ,click ok.

Step4: go to c drive ,tools->folderoptions->view->select show hidden files and folders

Step5: delete autorun.bat and thb.ico .
some times show hidden files and files option will not work though you selected option .
so in this case u need to delete above files using dos commands.
Step6: Restart you machine .

2009-02-22T05:06:00.000-08:00

Good java learning site :
http://www.javapassion.com/

Performing Inserts, Updates, and Deletes Im JSF

2008-11-02T03:42:00.000-08:00

Please See The Following Link:

http://www.netbeans.org/kb/60/web/inserts-updates-deletes.html

How to Find System architecture

2008-06-26T17:47:00.000-07:00

you don't know which architecture you're running you can run the following command:

$ uname -m
x86_64
...or...
i686

Ethernet Promisc Mode

2008-06-15T08:52:00.000-07:00

URL : http://www.hackosis.com/index.php/2007/12/11/what-is-promiscuous-mode-and-how-do-i-use-it/

Promiscuous is defined as distributed or applied without order. It means the same in the world of information technology. When a network adapter is in promiscuous mode it accepts all network packets whether they are intended for the specific machine or not.

Normally a node on the network will check the network packet before accepting to make sure it is the intended recipient. Promiscuous mode can be used for many things, such as troubleshooting network problems, software problems, recovering passwords, and also stealing information (can’t everything be used for both good or evil?).

Example of HTTP TCP/IP Packet:

image by Netmon Inc

Using Promiscuous Mode in Linux:

Enable promiscuous mode:

sudo ifconfig eth0 promisc

Disable promiscuous mode:

sudo ifconfig eth0 -promisc

How do I use it?

Thankfully, there are some applications that will take care of this for you:

Using Promiscuous Mode in Windows:

Recent Microsoft Windows operating systems have made it complicated to say the least to simply enable promiscuous mode. WinPcap is a library built specifically for being promiscuous and helping with the task of capturing network packets.

How do I use it?

Thankfully, there are some applications that will take care of this for you:

Wireshark | AirSnort (install guide) | Cain

Sorry Mac users, I don’t have Mac OS X v10.4 “Tiger” yet.

I hope you enjoy being promiscuous as much as I do. Keep in mind that running these programs at your school or other public networks could get you into trouble — promiscuous mode can be detected. FYI, if you are on a switched network (most modern networks are switched), you may have some trouble getting packets without ARP poisoning. Have fun and if any programs were missed, do leave a tip in the comments. Look forward to future posts on similar subjects at Hackosis. dontstealmyrsshackosis

Install Java In Linux

2008-06-14T22:46:00.000-07:00

C this Blog
http://vmunzenmayer.blogspot.com/

http://fedoranews.org/cms/node/2451

For YUM help
http://element14.wordpress.com/2007/08/08/how-to-use-yum/

Raw Socket

2008-06-08T23:55:00.000-07:00

Its a good link for learning raw sockets

security-freak.net

The 10 Things You Need to Know About Java SE 6 'Mustang'

2008-01-17T02:44:00.000-08:00

http://blogs.sun.com/dannycoward/entry/the_10_things_you_need

HttpConnection in java

2007-09-28T00:22:00.000-07:00

The user name and password are optional, so updating the Java code won't require updating any LotusScript code using the Java code. The way we've implemented this is by setting up variables, initially empty strings, to hold the user name and password. If the variables are empty strings at the time the URL is read, then nothing extra is done. If the variables have been set through a new method added to the class (setUserNameAndPassword), then those will be used to access the web page. The updated Java here still goes into a Java library, just like the previous tips:

import java.io.*;
import java.net.*;
import java.util.*;

public class GetHTML {

private Vector result = new Vector(); // An array of each line of HTML
private String userName = "";
private String password = "";

public void readHTML(String urlToRead) {
URL url; // The URL to read
HttpURLConnection conn; // The actual connection to the web page
BufferedReader rd; // Used to read results from the web page
String line; // An individual line of the web page HTML
try {
url = new URL(urlToRead);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
if ( (userName.equals("") == false) && (password.equals("") == false) ) {
String userPwd = userName + ":" + password;
String encoding = new sun.misc.BASE64Encoder().encode(userPwd.getBytes());
conn.setRequestProperty("Authorization", "Basic " + encoding);
}
rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
while ((line = rd.readLine()) != null) {
result.addElement(line);
}
rd.close();
} catch (Exception e) {
e.printStackTrace();
}
}

public int numLines() {
return result.size();
}

public String getHTML(int pos) {
if (pos < result.size()) {
return (String)result.elementAt(pos);
} else {
return "";
}
}

public void setUserNameAndPassword(String u, String p) {
userName = u;
password = p;
}
}

Hl7 Simple server Implementation

2006-08-24T02:27:00.000-07:00

/*
* HL7Server.java
*
* Created on August 12, 2006, 11:39 AM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/

package aaaaaaa;

import ca.uhn.hl7v2.app.Application;
import ca.uhn.hl7v2.app.Connection;
import ca.uhn.hl7v2.app.DefaultApplication;
import ca.uhn.hl7v2.app.Responder;
import ca.uhn.hl7v2.app.SimpleServer;
import ca.uhn.hl7v2.llp.LowerLayerProtocol;
import ca.uhn.hl7v2.parser.PipeParser;
import java.util.Vector;

/**
*
* @author srinivas
*/
public class MyHL7Service {

/** Creates a new instance of HL7Server */
public MyHL7Service() {
}
public static void main(String arg[]){
// 1 .In order to receive HL7 message create simple server object
// 2 .then write a class which implements Application intercafe and implement those methods accoding to ur needs
//and finally register Application obect with simpleserver
// 3. if u want a connection Listener thn implement ConnectionListener interface and register with simple server
//here i wrote implementations MisApplications and MISConnection Listener
//copy these 3 classes compile and run and this program is ready to receive the mesages
//u run amessage tester which wil send HL7 messages to the particular ip and port using
//java -jar hapi-0.5beta.jar

PipeParser pipe=new PipeParser();
SimpleServer simpleserver=new SimpleServer(2100,LowerLayerProtocol.makeLLP(),pipe);
simpleserver.start();
Application app=new MyApplication();
MyConnectionListener conlistener=new MyConnectionListener();
simpleserver.registerConnectionListener(conlistener);
simpleserver.registerApplication("*","*",app);
conlistener.showConnections();

}
}

2 . Connection Listener

/*
* MyConnectionListener.java
*
* Created on August 14, 2006, 12:44 PM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/

package aaaaaaa;

import ca.uhn.hl7v2.app.Connection;
import ca.uhn.hl7v2.app.ConnectionListener;
import java.io.File;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Vector;

/**
*
* @author srinivas
*/
public class MyConnectionListener implements ConnectionListener{
Vector con=new Vector();

public MyConnectionListener() {
}

public void connectionReceived(Connection connection) {
System.out.println(" Received from =="+connection.getRemoteAddress().getHostAddress());
con.add(connection.getRemoteAddress().getHostAddress());
System.out.println("got call to the server from ip=="+connection.getRemoteAddress().toString());
}
public void connectionDiscarded(Connection connection) {
for(String str:con){
if(str.equals(connection.getRemoteAddress().getHostAddress())){
con.remove(str);
System.out.println("Connection discarded ="+connection.getRemoteAddress().toString());

}
}

}
public void showConnections(){
System.out.println("=========Available connections are=======");
for(String str:con){

System.out.println(str);
}
System.out.println("=========================================");
}
}

3 Application

/*
* MyApplication.java
*
* Created on August 23, 2006, 10:00 AM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/

package aaaaaaa;

import ca.uhn.hl7v2.HL7Exception;
import ca.uhn.hl7v2.app.Application;
import ca.uhn.hl7v2.app.ApplicationException;
import ca.uhn.hl7v2.model.Message;
import ca.uhn.hl7v2.parser.DefaultXMLParser;
import ca.uhn.hl7v2.parser.PipeParser;
import ca.uhn.hl7v2.parser.XMLParser;

/**
*
* @author srinivas
*/
public class MyApplication implements Application{
String msg;
Message mesage;
/** Creates a new instance of MyApplication */
public MyApplication() {
}

public Message processMessage(Message message) throws ApplicationException, HL7Exception {
System.out.println("got call to theMisApplication ");
System.out.println("messageReceived *******************");
XMLParser xmlParser = new DefaultXMLParser();
PipeParser pipe=new PipeParser();
msg=pipe.encode(message);
msg.replace('\r', '\n');
String str=xmlParser.encode(message);
//Here im priinting the messages
// whrite the code and use this incoming message according to ur requirement
System.out.println(msg);
System.out.println(str);
return pipe.parse(msg);
}

public boolean canProcess(Message message) {
boolean flag=true;
PipeParser pipe=new PipeParser();
try{
msg=pipe.encode(message);
message= pipe.parse(msg);
}catch(Exception e){
flag=false;
e.printStackTrace();
}
System.out.println("got call to theMisApplication can process Method");
return flag;
}

}

copy the classes comlile and run u wil receive the hl7 messages .This u can modify according to ur needs