Python: verify the legality of client connections and the socketserver and pythonsocketserver

Python: verify the legality of client connections and the socketserver and pythonsocketserver
1. verify the validity of client links

1 from socket import * 2 import hmac, OS 3 4 secret_key = B 'linhaifeng bang '5 def conn_auth (conn): 6''' 7 authenticate client link 8: param conn: 9: return: 10 '''11 print ('start verifying validity of the new link ') 12 msg = OS. urandom (32) 13 conn. sendall (msg) 14 h = hmac. new (secret_key, msg) 15 digest = h. digest () 16 respone = conn. recv (len (digest) 17 return hmac. compare_digest (respone, digest) 18 19 def data_handler (conn, bufsize = 1024): 20 if not conn_auth (conn): 21 print ('this link is invalid, close ') 22 conn. close () 23 return24 print ('Connection valid, start communication') 25 while True: 26 data = conn. recv (bufsize) 27 if not data: break28 conn. sendall (data. upper () 29 30 def server_handler (ip_port, bufsize, backlog = 5): 31 ''' 32 only processes links 33: param ip_port: 34: return: 35 ''' 36 tcp_socket_server = socket (AF_INET, SOCK_STREAM) 37 bytes (ip_port) 38 tcp_socket_server.listen (backlog) 39 while True: 40 conn, addr = tcp_socket_server.accept () 41 print ('new connection [% s: % s] '% (addr [0], addr [1]) 42 data_handler (conn, bufsize) 43 44 if _ name _ = '_ main _': 45 ip_port = ('2017. 0.0.1 ', 9999) 46 bufsize = 102447 server_handler (ip_port, bufsize)

Server

1 _ author _ = 'linhaifeng' 2 from socket import * 3 import hmac, OS 4 5 secret_key = B 'Linhaifeng bang '6 def conn_auth (conn ): 7''' 8. Verify the connection from the client to the server. 9: param conn: 10: return: 11 ''' 12 msg = conn. recv (32) 13 h = hmac. new (secret_key, msg) 14 digest = h. digest () 15 conn. sendall (digest) 16 17 def client_handler (ip_port, bufsize = 1024): 18 tcp_socket_client = socket (AF_INET, SOCK_STREAM) 19 bytes (ip_port) 20 21 conn_auth (tcp_socket_client) 22 23 while True: 24 data = input ('>> :'). strip () 25 if not data: continue26 if data = 'quit': break27 28 tcp_socket_client.sendall (data. encode ('utf-8') 29 respone = tcp_socket_client.recv (bufsize) 30 print (respone. decode ('utf-8') 31 tcp_socket_client.close () 32 33 if _ name _ = '_ main _': 34 ip_port = ('2017. 0.0.1 ', 9999) 35 bufsize = 102436 client_handler (ip_port, bufsize)

Client 2. socketserver

Import socketserverclass Myserver (socketserver. baseRequestHandler): def handle (self): self. data = self. request. recv (1, 1024 ). strip () print ("{} wrote :". format (self. client_address [0]) print (self. data) self. request. sendall (self. data. upper () if _ name _ = "_ main _": HOST, PORT = "127.0.0.1", 9999 # Set allow_reuse_address to allow the server to reuse the socketserver address. TCPServer. allow_reuse_address = True # create a server and bind the service address to 127.0.0.1: 9999 server = socketserver. TCPServer (HOST, PORT), Myserver) # Let the server run forever, unless the program server is forcibly stopped. serve_forever ()

Server

Import socketHOST, PORT = "127.0.0.1", 9999 data = "hello" # create a socket link. SOCK_STREAM indicates that the TCP protocol with socket is used. socket (socket. AF_INET, socket. SOCK_STREAM) as sock: sock. connect (HOST, PORT) # link to the client sock. sendall (bytes (data + "\ n", "UTF-8") # send data to the server encoded ED = str (sock. recv (1024), "UTF-8") # receives data print ("Sent :{}" from the server :{}". format (data) print ("Received :{}". format (encoded ed ))

Client