part 2 Ep(2)Adding raw input to our port scanner
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Port scanner in Python
This post will show how you can make a small and easy-to-use port scanner program written in Python. There are many ways of doing this with Python, and I’m going to do it using the built-in module Socket.
Sockets
The socket module in Python provides access to the BSD socket interface. It includes the socket class, for handling the actual data channel, and functions for network-related tasks such as converting a server’s name to an address and formatting data to be sent across the network.
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Source Sockets are widely used on the Internet, as they are behind any kind of network communications done by your computer.
The INET sockets, account for at least 99% of the sockets in use. The web browser’s that you use opens a socket and connects to the web server.
Any network communication goes through a socket.
For more reading about the socket module, please see the official documentation.
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Socket functions
Before we get started with our sample program, let’s see some of the socket functions we are going to use.
Syntax for creating a socket
sock = socket.socket (socket_family, socket_type)
Creates a stream socket
sock = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
AF_INET
Socket Family (here Address Family version 4 or IPv4)
SOCK_STREAM Socket type TCP connections
SOCK_DGRAM Socket type UDP connections
Translate a host name to IPv4 address format
gethostbyname(“host”)
Translate a host name to IPv4 address format, extended interface
socket.gethostbyname_ex(“host”)
Get the fqdn (fully qualified domain name)
socket.getfqdn(“8.8.8.8”)
Returns the hostname of the machine..
socket.gethostname()
Exception handling
socket.error
Making a program using Python Sockets
This small port scanner program will try to connect on every port you define for a particular host. The first thing we must do is import the socket library and other libraries that we need.
ipv4
