###### tags: `python` `TCPclient` `TCPserver`

# TCPclient/TCPserver

import socket
import argparse
import time
parser = argparse.ArgumentParser(
    description="Meohw hecker client programs",
    formatter_class=argparse.RawDescriptionHelpFormatter,
    epilog="example\n"
    "python tcpClient.py -i meowhecker.com -p 6669 "
    )
# User interface 
parser.add_argument("-i", "--RHOST", help="input the server name", default="127.0.0.1", required=True)
parser.add_argument("-p", "--RPORT", type=int, help="input the server ports", default="6669", required=True)
group = parser.add_mutually_exclusive_group()
group.add_argument("-q", "--quite", help="don't display ditail information", action="store_true")
group.add_argument("-v", "--verbose", help="show detial information", action="store_true")
args= parser.parse_args()

def main():
    client=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    client.connect((args.RHOST,args.RPORT))
    client.send(bytes("fwer564 ","utf-8"))
    '''
    message = client.recv(1024)
    print(message.decode("utf-8"))
    '''
    fullMessage=""
    while 1:
        message = client.recv(8)  # flow control (The receiver tells the sender how many bytes he could send) 1byte = char
        if len(message)<=0:
            break
        else:
            fullMessage += message.decode("utf-8")        
    print(fullMessage)

if __name__ == "__main__":
    main()
    connectFlag=1
    #group
    
    if args.verbose and connectFlag == 1:
        x=0
        while 1:
            x+=1
            print(f"Throught time = {x}")
            time.sleep(1)

## Textwarp module

[Reference web](https://docs.python.org/3/library/textwrap.html)
> It's convenient module to print text

### textwarp.dedent('''text''')

>Remove any leading whitespace in every line in text.

## TCP server

import socket
import threading
import argparse
import textwrap
parser=argparse.ArgumentParser(
        description="TCP meowhecer sever ",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="example= tcpServer.py -i meowhecker.com -r 6669\n"
        )
parser.add_argument("-i", "--LHOST", help="set self host address !!", default="meowhecker.com",required=True)
parser.add_argument("-p", "--LPORT", type=int, help="set self host Port !!", default=6669, required=True)
args = parser.parse_args()
       
def clientHandler(socketClient):  # job 1 
    with socketClient as sockets:
        password = sockets.recv(1024)
        print(f'Receive from clientHost, password is {password.decode("utf-8")}')

        socketClient.send(bytes(  #Due to TCP is stream-oriented, we need to use byts() or b'' to send and incoding
            textwrap.dedent('''
                welcome to meowhecer TCP server!!!!!!!!!
                meow meow meow meow~~ 
                ServerACK'''),
            "utf-8" 
            ))       #send (bytes("messages","encoding"))
        socketClient.close()  # if you don't close, it will occur problems but I don't know why XD oh noooooooo!

def server(LHOST,LPORT):
    server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    server.bind((LHOST,LPORT))
    server.listen(10) # queue 
    print(f'[*] listening on {LHOST}:{LPORT}')

    while 1:
        socketClient, address = server.accept()
        print(f'[*] Connection form {address[0]}:{address[1]} has been edstablished !!!!')
        thread = threading.Thread(target=clientHandler,args=(socketClient,))
        thread.start()
        thread.join() #無聊亂寫 haaaaa (Berfore subthreading job has been all down, the following program will wait for it. 
        
if __name__=="__main__":
    server(args.LHOST,args.LPORT)