portscan.py

import sys
import socket

def main():
	args = sys.argv
	if len(args) < 2:
		print("[!]Falta argumentos para o programa! Saindo...")
		sys.exit(1)
	ip = args[1]
	portas = args[2] if len(args) >= 3 else "1:65536"
	portas = (x for x in range(int(portas.split(":")[0]), int(portas.split(":")[1])+1))
	scan(ip, portas)

def banner(sckt, ip, porta):
	try:
		sckt.settimeout(1)
		sckt.connect((ip, porta))
		banner = sckt.recv(1024).decode().strip()
		assert banner
		return banner
	except:
		return "Unknown"

def child(ip, port):
	try:
		s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) 
		s.settimeout(0.3)
		if s.connect_ex((ip, port)) == 0:
			print("{}/tcp open".format(port), end="|")
			print(banner(s, ip, port))
	except:
		pass

def scan(ip, portas):
	for c in portas:
		child(ip, c)

if __name__ == '__main__':
	main()