socket模块综合

1.客户端的链接合法性验证:

　　恶意的登录:扫描端口(0-65535)

　　 tcp没有做登录客户端时:

　　　使用hmac生成对随机字符串的摘要

import os
import hmac
import socket

def auth(conn):
    msg = os.urandom(32) #生成一个随机字符串
    conn.send(msg) #发送到客户端
    result = hmac.new(secret_key,msg) #处理这个字符串,得到一个结果
    # print(result)
    client_digest = conn.recv(1024)  # 接收客户端返回的处理结果
    if result.hexdigest() == client_digest.decode('utf-8'):
        print('合法的链接') #对比成功可以继续通信
        return True
    else:
        print('非法链接')
        return False
secret_key = b'123'
sk = socket.socket()
sk.bind(('192.168.16.33',8088))
sk.listen()
conn,addr = sk.accept()
# print(conn)
if auth(conn):
    print(conn.recv(1024))
    conn.close()
else:
    conn.close()
sk.close()

　　

import hmac
import socket
sk = socket.socket()
sk.connect(('192.168.16.33',8088))

def auth(sk):
    # print(sk)
    msg = sk.recv(1024)
    result = hmac.new(key,msg)
    # print(result)
    res = result.hexdigest()
    sk.send(res.encode('utf-8'))

key = b'123'
auth(sk)
sk.send(b'upload')
sk.close()　

 2:socketserver模块;

　　tcp协议,一个服务端同时与对个客户端同时通信

　　

import socketserver
class Myserver(socketserver.BaseRequestHandler):
    def handle(self):
        conn = self.request
        while True:
            conn.send(b'abc')
            print(conn.recv(1024))
server = socketserver.ThreadingTCPServer(('192.168.16.33',8088),Myserver)
server.serve_forever()

　　

import socket

sk = socket.socket()
sk.connect(('192.168.16.33',8088))
while True:
    ret = sk.recv(1024)
    print(ret)
    sk.send(b'byebye')
sk.close()