How do I recv data to a string

See more:

Linux

Python

shell

networking

i am trying to make my own root shell for my server so that i can work on the in side of it, but ever time i try and check if the input == "exit" it just don't check it and continues. sorry is this is spelled wrong, i am not english. i just can't see what i am doing wrong. plus i am trying to have to work with more then one client and will be adding a login and well i need to know how to compare the recv data and check it so that the login works and well i just don't know whats going wrong.

What I have tried:

import socket
import threading
import json
import hashlib
from subprocess import PIPE, Popen

decode_utf8 = lambda data: data.decode("utf-8")

def main():
    s = socket.socket()
    s.bind(('127.0.0.1', 12344))
    s.listen(5)
    while True:
        r, addr = s.accept()
        print("Connected to by {}".format(str(addr)))
        threading.Thread(target=login(r)).start()

def login(r):
    read = open('data.json', 'r')
    data = json.load(read)
    while True:
        input_user = r.recv(1024)
        user = decode_utf8(input_user)
        try:
            password = data[str(user)]['password']
            input_user = r.recv(1024)
            pwd = decode_utf8(input_user)
            passdata = hashlib.sha256(pwd.encode().hexdigest()
            if passdata == password:
                rootShell(r)
            else:
                r.send('Wrong Password or Username')
                r.close()
        except:
            r.send('Wrong Password or Username')
            r.close()

def rootShell(r):
    while True:
        input_data = r.recv(1024)
        data = decode_utf8(input_data)
        print(data)
        try:
            if data.lower().startswith("exit"):
                r.send('Goodbye and see you later')
                r.close()
            else:
                r.send(cmdline(data))
        except:
            r.send("Error Running Command")

def cmdline(command):
    process = Popen(
        args=command,
        stdout=PIPE,
        shell=True
    )
    return process.communicate()[0]

main()