Tag Archives: php telnet connection

Knowing when to fold ( i.e. SSH is better than Telnet )

You have probably seen my  previous post on connecting to Telnet through PHP although it was a novel idea I have just learned that (from a Novell site. No pun intended.) Telnet is very insecure!! To make things clearer Telnet usually creates connections as below;

Telnet-Client-server-unencrypted

Up here you can see a hacker can sniff the client-server connection and actually steal the user name and password sent by client. This really won’t do since if someone can spoof/hack/attack our embedded system which we will be adding to home appliances things may go awry. i.e. you will start seeing automated vacuum cleaners attacking your cat. ( Statistics show that H4X0Rz hate cats. )

Hence we can clearly see we need another way for the server and client to talk to each other. After some short Googling I am thinking of using SSH which is native to Linux/Unix based systems. Where the connection will be as below ;

SSH-client-server-encryptedAs you can see the SSH encryption creates a safer environment for the client and the server plus any DNS attacks and eavesdropping is clearly impossible. (if not probable.)

Henceforth a new PHP and Python (this time I will write the server+client in Python) shall be written. Please expect updates.

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Connecting to PHP using telnet and sending data to the same port using Java

Hi there! Have been busy busy busy. What I needed was a way to the following;
Very Simple LayoutAbove you are looking at a very simple layout. ( Almost childishly simple ) The embedded device has Linux installed with a supposedly very light JVM ( Java Virtual Machine ) So if I am to send data to and from the server and display it to the user I have to do some scripting both in Java and in PHP. Let us first take a look at our universal Java-Socket program which basically opens and listens to a certain port (socket );

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