day26作业

1.整理TCP三次握手、四次挥手图

2.基于TCP开发一款远程CMD程序
客户端连接服务器后，可以向服务器发送命令
服务器收到命令后执行，无论执行是否成功，无论执行几遍，都将执行结果返回给客户端
注意: 执行系统指令使用subprocess模块完成.

# 服务端.py
import socket
import subprocess
sever = socket.socket()

sever.bind(('127.0.0.1',1111))

sever.listen(5)
while True:
    conn,addr = sever.accept()

    while True:
        try:
            data = conn.recv(1024).decode('utf8')
            if data =='q':
                break
            res = subprocess.Popen(data,shell=True,stderr=subprocess.PIPE,stdout=subprocess.PIPE)

            data1 = res.stdout.read()
            data2 = res.stderr.read()

            conn.send(data1+data2)

        except Exception as e:
            print(e)

    conn.close()

# 客户端,py
import socket
client = socket.socket()

client.connect(('127.0.0.1',1111))

while True:
    msg = input('>>>')

    client.send(msg.encode('utf8'))
    if msg == 'q':
        break

    data = client.recv(1024).decode('gbk')

    print(data)

client.close()