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/*
 * Here's a sample kernel module showing the use of jprobes to dump
 * the arguments of third-party network driver for Bercut ETN.
 *
 * For more information on theory of operation of jprobes, see
 * Documentation/kprobes.txt
 *
 * Build and insert the kernel module as done in the kprobe example.
 * You will see the trace data in /var/log/messages and on the
 * console whenever do_fork() is invoked to create a new process.

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Git Cheat Sheets and Examples

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Linux NetFilter, IP Tables and Conntrack Diagrams

IPTABLES TABLES and CHAINS

IPTables has the following 4 built-in tables.

1) Filter Table

Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.

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1. Convert our ".jks" file to ".p12" (PKCS12 key store format):
 
keytool -importkeystore -srckeystore oldkeystore.jks -destkeystore newkeystore.p12 -deststoretype PKCS12
 
1.1. List new keystore file contents:
 
keytool -deststoretype PKCS12 -keystore newkeystore.p12 -list
 
2. Extract pem (certificate) from ".p12" keysotre file:
 

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Introduction to Kafka

Kafka acts as a kind of write-ahead log (WAL) that records messages to a persistent store (disk) and allows subscribers to read and apply these changes to their own stores in a system appropriate time-frame.

Terminology:

• Producers send messages to brokers
• Consumers read messages from brokers
• Messages are sent to a topic

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import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

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import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

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public class Im4javaUtil implements ImageUtil {

    private static final Logger logger = LoggerFactory.getLogger(Im4javaUtil.class);

    private static String tmpdir;
    
    private static boolean WINDOW_OS = false;
    
    static {
        String osName = System.getProperty("os.name").toLowerCase();

hushi55

import org.apache.log4j.Logger;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

@SuppressWarnings("all")
public class SimpleImageInfo {