Packet Sniffer Sniffers are programs that can capture/sniff/detect network traffic packet by packet and analyse them for various reasons. Commonly used in the field of network security. Wireshark is a very common packet sniffer/protocol analyzer. Packet sniffers can be written in python too. In this article we are going to write a few very simple… Read More »
MPDF Many php applications need to create pdf of documents like invoice , receipt and even id card etc. In this article we shall create a pdf invoice using the mpdf pdf creation library. Mpdf is made in php without any other external library. Mpdf parses css much better than any other free pdf libraries… Read More »
Packet Sniffer Example of a packet sniffer is Wireshark. Packet sniffers pick up the packets going in and out of a system and analyse them and present them to user for further analysis. In this post we are going to code a simple packet sniffer in php. The basic theory this packet sniffer is that… Read More »
Php functions like zip_open return an error number if they fail. To get the corresponding error message from the error number , use the following function. function zip_error_message($errno) { // using constant name as a string to make this function PHP4 compatible $zipFileFunctionsErrors = array( 'ZIPARCHIVE::ER_MULTIDISK' => 'Multi-disk zip archives not supported.', 'ZIPARCHIVE::ER_RENAME' => 'Renaming… Read More »
When a browser makes a request to a php script, the browser sends some http headers which can look like this : Host: localhost Connection: keep-alive User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Accept-Charset: UTF-8,*;q=0.5 Cookie: username=admin; password=21232ffc3; PHPSESSID=o5m4e2td1m66c4pkjdag9vs0u2 The php script under request ,… Read More »
In this article we are going to login into Google Adsense and retrieve earnings. Google Adsense now has a new interface and so needs a different kind of coding. In this example we shall fetch “yesterday’s” earnings sitewise. Create a Report to be fetched : First open the sitewise report in the Performance Tab in… Read More »
PHP has a useful function called dns_get_record that can be used to get different types of records for a give domain , very easily. These include the nameserver records, A records, CNAME records, MX records, SOA records etc. The following examples are using the interactive shell, but you would use the function the same way… Read More »
PHP Handlers PHP handlers are a link between a webserver(say Apache) and the PHP libraries. PHP handlers enable a webserver to load the PHP library in a certain manner and execute the PHP code and return the output to the webserver. There are many different kind of PHP handler setups available. Each has its own… Read More »
Suphp Suphp php handler is an apache module (mod_suphp) that runs php scripts with ownership and permission of a specific user. This is seen as a security enhancement since the system can keep track of which user’s php script is running (and causing problems if any). In shared hosting environments suphp is very popular since… Read More »
Monitor the network bandwidth used by each process with nethogs command on Linux
Ngrep ngrep or network grep is a command line program that can be used to analyze and search network packets for a given regex pattern or string. ngrep uses the pcap library to capture network packets and gnu regex library to perform regex searches. ngrep is like tcpdump + grep. In this article we shall… Read More »
To connect to your bsnl broadband connection using the 110TC1 router follow the simple steps : 1. Switch on the modem , connect the ethernet wire , and connect the phoneline/adsl line. 2. Open http://192.168.1.1 in your browser. Use the following username password to login username : admin password : admin or password It should… Read More »
Note: The Operating System in use is Ubuntu Linux (11.04) My Gem Environment – $ gem env RubyGems Environment: – RUBYGEMS VERSION: 1.8.11 – RUBY VERSION: 1.9.2 (2010-08-18 patchlevel 0) [x86_64-linux] – INSTALLATION DIRECTORY: /usr/local/lib/ruby/gems/1.9.1 – RUBY EXECUTABLE: /usr/local/bin/ruby – EXECUTABLE DIRECTORY: /usr/local/bin – RUBYGEMS PLATFORMS: – ruby – x86_64-linux – GEM PATHS: – /usr/local/lib/ruby/gems/1.9.1… Read More »
Hping Hping is a command line tool that can be used to generate packets on the network for scanning and diagnosis purpose. Its similar to the ping command that generates and sends icmp packets to a remote host to check if its alive or not. But hping has more features. Besides icmp, it can also… Read More »
There are many instances when you want to take the screenshot of a webpage from within a php script or the command line. On ubuntu there are several ways to do it and most of them produce a webkit , gecko or khtml rendered screenshot image. Some of the methods require X session to open… Read More »
VNC stands for Virtual Network Computing or in simple terms its ‘Remote Desktop’. It allows a system to access the desktop of another system. Now lets see how vnc can be done on ubuntu. Install Packages $ sudo apt-get install vnc4server xvnc4viewer 1. vnc4server – This is the vnc server application. It is run on… Read More »
In this tutorial, I am going to show you a simple way to write a Hit Counter script in PHP to save and display the number of visits to your website. We will basically store and increment the hits in a file, that can be used to display the total hit count as well. The… Read More »
A port scanner is a program designed to probe a server or host for open ports. Looking at open ports, one can tell what services might be running on the remote server. We earlier made a TCP Connect port scanner in C here – https://www.binarytides.com/tcp-connect-port-scanner-code-c-winsock/ and here – https://www.binarytides.com/tcp-connect-port-scanner-c-code-linux-sockets/ Now we shall try making the… Read More »
Here is a list of port scanners that work on Ubuntu/Linux. 1. Angry IP Scanner Download and Install from http://www.angryip.org/ Fast and easy to use network scanner and port scanner. To scan ports got to Tools > Preferences > Ports > Port Selection Enter the ports you want to scan Start the scan. 4. Nmap… Read More »
The getimagesize function of php provides lot of information about an image file , including its type. The type can be used to check if the file is a valid image file or not. To check if a file is an image or not, use the function function is_image($path) { $a = getimagesize($path); $image_type =… Read More »