Dynamically assigned TCP port scanning
This time, we will create an echo server that can dynamically open a TCP port to check a connection. As with the previous UDP port detection, we will use epoll. TCP works a little differently than UDP. In TCP, the client tries to connect to the bound socket. And the server socket creates a new socket through the accept function and then communicates with this socket. <tcp/ip socket communication process> Multiple port tests To test ports in a specific band, all ports in the corresponding area should be opened and bind operation should be performed. If there is a port where the bind operation failed, take action after confirming that this port is already in use by another process. The TCP example is a little more complicated than the UDP example because it creates a new socket and communicates through the processes of listen and accept. #!/usr/bin/env python import socket import time import select import logging import argparse log...
