#server端
import os
import hmac
import socket
secret_key = b'alex_sb'def auth(conn):msg = os.urandom(32) #生成一个随机的字符串conn.send(msg)   #发送到client端result = hmac.new(secret_key,msg)  #处理这个随机字符串，得到一个结果client_digest = conn.recv(1024)   #接收client端处理的结果if result.hexdigest() == client_digest.decode('utf-8'):print('是合法的连接')   #对比成功可以继续通信return Trueelse:print('不合法的连接')   #成功closereturn Falsesk = socket.socket()
sk.bind(('127.0.0.1',9000))
sk.listen()
conn,addr = sk.accept()
if auth(conn):print(conn.recv(1024))#正常的和client端进行沟通了
    conn.close()
else:conn.close()
sk.close()

#client端
import hmac
import socket
key = b'alex_sb'
def auth(sk):msg = sk.recv(32)result = hmac.new(key,msg)res = result.hexdigest()sk.send(res.encode('utf-8'))sk = socket.socket()
sk.connect(('127.0.0.1',9000))
auth(sk)
sk.send(b'upload')
# 进行其他正常的和server端的沟通
sk.close()

import socketserver
#tcp协议的server端就不需要导入socket
# socketserver:进一步封装
#        ↓
# socket 底层模块class Myserver(socketserver.BaseRequestHandler):def handle(self):conn = self.requestwhile True:conn.send(b'hello')print(conn.recv(1024))server = socketserver.ThreadingTCPServer(('127.0.0.1',9000),Myserver)
server.serve_forever()

#server端
import socket
sk = socket.socket()
sk.bind(('127.0.0.1',9000))
sk.listen()
while True:conn,addr = sk.accept()while True:conn.send(b'hello')print(conn.recv(1024))#client端
import socket
sk = socket.socket()
sk.connect(('127.0.0.1',9000))
while True:ret = sk.recv(1024)print(ret)sk.send(b'byebye')
sk.close()

# blocking 阻塞
import socket
sk = socket.socket()
sk.bind(('127.0.0.1',9000))
sk.setblocking(False)
sk.listen()
while 1:try:conn,addr = sk.accept() #如果没有人来连接我，我就不在这里等待，非阻塞print(sk)breakexcept BlockingIOError:pass
conn.recv(1024)