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HackxCrack PDF Perl Manual (III): First Basic Program Manual SQL

Like with the Manual of Perl, I will start a series of articles to learn the language of SQL databases. It is a very basic manual aimed at those who do not have knowledge about it or a very basic knowledge. I appreciate any suggestions or corrections. Introduction
SQL stands for Structured Query Language , language communication standard widely used databases. Some of its features is the saving of time, flexibility and security in the maintenance of data. Most
management systems modern relational databases like MySQL , MS SQL Server, Microsoft Access, MSDE, Oracle, DB2, Sybase, Postgres and Informix use SQL as a language standard. Despite being used by major RDBMS , each of which implements specific functions which need not necessarily work in others.
This manual will explain the most common SQL commands and how to apply on the basis of known data.

defined functions defined in the standard SQL: SELECT

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(I): Introduction to German law outlawing

Germany is the first European country to introduce tougher laws in this country, laws that will prevent (or so he thinks the government) hacker activities. The so-called Anti-hacking Law

said that create or own security tools that could potentially be used in attacks is prohibited.

Some amendments of this law clearly defines that even a local attack

Denial of Service (against an application) will be considered a crime. "Hackers" - which in his opinion - are the people who commit such attacks, could be sentenced to more than 10 years in prison. Controversy is the best word to describe what goes through the head of security professionals from Germany, who do not know whether they do or do not work. For example, create and own tools, as this can be used for various purposes ...

is, not tools can be used to run tests on a network, as these can cause a Denial of Service (DoS) and that password crackers or talk. The fact is that, by law, any security company will be committing an illegality, as in analyzing a network are using a port scanner. This clearly shows that the German government did not take into account the views of these professionals.

security consultants expect some modifications, such as those in the law of "computer misuse" in the UK. Many security-related groups are removing the tools that may be related to this law, as in the group "The Hackers Choice

, or are moving to Holland, as the creators of KisMAC (a network sniffer) on its website reads" German says: Good-bye KisMAC ! "
But what tools can be used to hack?

Your browser (you can use to exploit flaws in Web applications). Or just a console terminal telnet ... ... ... vi ... notepad?

For many drivers do not need any other tool to invade a system.

The Chaos Computer Club

(respected German hacker group) summarizes the situation: " seems that German politicians have now decided that the country is free of security problems
. " That with his pen and his total lack of knowledge created another stupid law that will not solve any problem
.
And the security companies? or close or be "criminal" ...

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security tools

Before you start writing code is a series of tasks to be taken into account if we do it right. Of course we can simply open a text editor, write some lines of code and run it, if you need something short, fast and sweet would be fine, but if you're writing a script that we use in the future or pass to another person or group must follow some basic guidelines and highly recommended: Planning program flow organize to reuse parts, if necessary Document, document, document.

Comments
A comment is just a text or notes within the code, which is not interpreted, the Perl interpreter
simply ignored.
is used to add information about the code or sections of it.


To write comments in Perl
using the # symbol. Any text after # until the end of line is a comment. # This is a comment

Perl has no multiline comment marker, so to comment multiple lines put a # at the beginning of each.

# Sample # comment

• multi
.

Templates, a good habit
A good habit is to make a template as a basis for our scripts, so we get that all we write are similar and consistent meaning to it.
It should include information on who wrote it, when, what does and what version is. Moreover, if we are creating any subroutine in the script, we should also indicate what should happen, what is returned and a description of the function.
An example template would be:

[header script]
# / usr / bin / perl-w
#------------------- -
# Script Name: # Script Version: # Date: # Author: # Description:
# Revision History:
# 1.0 /
: original version #------------
--------
[END header script]



[Header function]


#--------------------

# Function # # Version Adde
Input: # Output: # Description:
#------

-------------- [END header function]




Frontline

The first line of our programs must begin with
#! and path to the Perl interpreter. It is not always necessary but highly recommended, as it indicates the program where to find the interpreter and used to pass options at runtime. For example, to run the script Warning mode (and the interpreter is in / usr / bin) should be our first line:
# / usr / bin / perl-w

This will run our script activating several useful warnings, but there are many different options, for more information it is best to consult the manual for perl.




Related articles:



Perl Manual: Introduction