Ahsun Taquveem Chohan

A- INTRODUCTION
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A-1. WHAT IS A DENIAL OF SERVICE ATTACK
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Denial of service is about without permission knocking off services, for example through crashing the whole system. This kind of attacks are easy to launch and it is hard to protect a system against them. The basic problem is that Unix assumes that users on the system or on other systems will be well behaved

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I will teach you how to create a basic script that allow people to upload files and stores details of their uploads in a database. Follow up, it is not hard at all…. If you have questions, feel free to ask

First we need to create the database table with the following SQL:

CREATE TABLE `uploads` (
`id` int(10) unsigned NOT NULL auto_increment,
`whenuploaded` datetime NOT NULL default '0000-00-00 00:00:00',
`ipaddress` varchar(15) NOT NULL default 'unknown',
`imageloc` varchar(255) NOT NULL default 'unknown',
`imagesize` int(10) unsigned default NULL,
`imagetype` varchar(30) default NULL,
PRIMARY KEY (`id`)
) TYPE=MyISAM;

Then here’s the PHP code you need at the top of the page where you’re going to have your upload form. You need to change the database access details at the top and the ‘defines’ to specify your domain and path names. Create the DEST_DIR directory on the server with 777 permissions.

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