TCP - Retour au collège

Rédaction d'un script python

import socket
import re
from math import *

def netcat(HOST,PORT):

    # Create a socket object
    s = socket.socket()        

    # connect to the server on local computer
    s.connect((HOST, PORT))

    # receive data from the server and decoding to get the string.
    res = s.recv(1024).decode()

    print(res)
    # read number
    regex = "([0-9]+)"

    # Search regex
    search = re.findall(regex, res)

    # caclul square
    first_res = sqrt(int(search[1]))
    print(f'The first res : {first_res}')

    # second calcul
    second_res = first_res * int(search[2])
    print(f'The second res : {second_res}')

    # round the result
    round_res = round(second_res,2)
    print(f'The last res : {round_res}')

    # send result
    s.sendall((str(round_res)+"\n").encode())

    return s.recv(1024).decode()


def main():
    print(netcat("challenge01.root-me.org",52002))

if __name__ == "__main__":
    main()

Flag :

RM{TCP_C0nnecT_4nD_m4Th}