SocketServer模块，hmac模块验证client合法性

 hmac模块：

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1.模块初识：

import hmac
# h = hmac.new() #括号里要给它连个bytes类型，一个是自定义的secret_key，一个是你想进行加密的bytes
# 密文 = h.digest()
# hmac.compare_digest() #括号内传另外一个密文，看是否相等

h = hmac.new(b'secret',b'382835896')
digest = h.digest()
print(digest)
#>>>>  b'xa4<
xf8xec0x7fx8aoxecxa7(xf7[txfb'

h = hmac.new(b'secret',b'382835896')
digest2 = h.digest()
print(hmac.compare_digest(digest,digest2)) #返回true

2.使用hmac模块，验证client端的合法性

import os
import hmac
import socket
secret_key = b'wwl'
sk = socket.socket()
sk.bind(('127.0.0.1',8080))
sk.listen()
def check_client(conn):
    msg = os.urandom(32)
    conn.send(msg)
    h = hmac.new(secret_key,msg)
    digest = h.digest()
    client_digest = conn.recv(1024)
    return hmac.compare_digest(digest,client_digest)

conn,addr = sk.accept()
res = check_client(conn)
if res:
    print('合法的客户端')
    conn.close()
else:
    print('不合法的客户端')
    conn.close()
sk.close()

import socket
import hmac

secret_key = b'wwl111'
sk = socket.socket()
sk.connect(('127.0.0.1',8080))

msg = sk.recv(1024)
h = hmac.new(secret_key,msg)
client_digest = h.digest()
sk.send(client_digest)
sk.close()

socketserver模块：

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解读socketserver源码 —— http://www.cnblogs.com/Eva-J/p/5081851.html 

socketserver模块可以开启server端的多线程，让多个client端访问server端：

import socketserver
class MyServer(socketserver.BaseRequestHandler):
    def handle(self):#原来socket写的程序里所有和conn有关的操作，都挪到handle方法里
        #self.request#相当于conn  #一旦客户端断开连接了，handle方法也应该结束
        while True:
            msg = self.request.recv(1024).decode('utf-8')
            if msg == 'q':break
            print(msg)
            info = input('%s>>>> '%msg[:2])
            self.request.send(info.encode('utf-8'))

if __name__ == '__main__':
    server = socketserver.ThreadingTCPServer(('127.0.0.1',8080),MyServer)
    server.serve_forever()

import socket
sk = socket.socket()
sk.connect(('127.0.0.1',8080))
while True:
    msg = input('>>>> ')
    if msg == 'q':
        break
    sk.send(msg.encode('utf-8'))
    ret = sk.recv(1024).decode('utf-8')
    print(ret)
sk.close()