Python---socket module

Here is a socket programming example that emulates the SSH Remote execution command

The socket establishes the connection process and simulates the call process.

socket_server.py

#!/usr/bin/env python#-*-coding:utf-8-*-ImportSocketImportSubprocess#Import Execution Command Module#define "calling card"Ip_port= ('127.0.0.1', 9998)#Defining tuples#"Buy a cell phone"S=socket.socket ()#binding protocol, raw complete sockets#"bind card and Phone"S.bind (Ip_port)#Binding ip+ protocol + port: used to uniquely identify a process, ip_port must be a tuple format#"Powering on"S.listen (5)#to define the maximum number of pending connections#waiting for a call whileTrue:#used to repeatedly receive a new connectionConn,addr=s.accept ()#receives a client connection request, returns conn (equivalent to a specific connection), addr is the client Ip+port    #Receive Message     whileTrue:#used to repeatedly send and receive messages based on a connection           #Snapping Client exception shutdown (CTRL + C)           #If the client shuts down unexpectedly (Close () is not executed), the connection exception is caused and the service side is also abnormal           Try: Recv_data=CONN.RECV (1024)#message received, blocked after receipt, receive size between 1024 and 8192                #print (len (recv_data))                #if the client exits normally (close () is executed), the server recv function will receive an empty message, and the servers side also exits                ifLen (recv_data) = =0:Print("client exits normally")                     BreakP=subprocess. Popen (str (recv_data,encoding='UTF8'), shell=true,stdout=subprocess. PIPE)#Execute system CommandRes=p.stdout.read ()#Get standard output                #If you execute a command error, the standard output is empty, you must determine if the standard output is empty, if the null send_data is ' cmd err ', it will cause the client recv () to block                ifLen (res) = =0:send_data='cmd err'                Else:                    #the standard output of the Windows Platform command is GBK encoding, which needs to be converted to a string first (because the strings in various encodings are the same)Send_data=str (res,encoding='GBK')                #Convert to UTF8, note that Python3 needs to be converted to bytes in order to send, Python2 can send the string directlySend_data=bytes (send_data,encoding='UTF8')                #solving Sticky pack problemsready_tag='ready|%s'%Len (send_data) conn.send (bytes (ready_tag,encoding='UTF8'))#tell client side data lengthFEEDBACK=CONN.RECV (1024)#Receive confirmation InformationFeedback=str (feedback,encoding='UTF8')#The received is also bytes, which need to be converted into a string                ifFeedback.startswith ('Start'):#If the confirmation message starts with "Start"Conn.send (Send_data)#The execution result of the Send command           exceptException:Print("Client Exception Exit")             Break    #"Hang up the phone"Conn.close ()

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socket_client.py

#!/usr/bin/env python#-*-coding:utf-8-*-ImportSocketip_port=('127.0.0.1', 9998)#"Buy a cell phone"s=Socket.socket ()#"Dial-up"S.connect (Ip_port)#connection Server, if a good connection already exists on the server, then Hang whileTrue:#to loop a message based on a connection established by connectSend_data=input (">>:"). Strip ()ifSend_data = ='Exit': Break    ifLen (send_data) = = 0:Continues.send (bytes (send_data,encoding='UTF8'))    #solving Sticky pack problemsREADY_TAG=S.RECV (1024)#to charge bytes with data length: ready|9998Ready_tag=str (ready_tag,encoding='UTF8')    ifReady_tag.startswith (' Ready'):#ready|9998Msg_size=int (Ready_tag.split ('|') [-1])#get the length of data to receivestart_tag='Start's.send (bytes (start_tag,encoding='UTF8'))#Send confirmation message "Start"    #Loop over received data based on the length of data received to receiveRecv_size=0 recv_msg=b"'    #represents an empty byte     whileRecv_size <Msg_size:recv_data=S.RECV (1024) recv_msg+=Recv_data recv_size+=Len (recv_data)Print('MSG Size%s rece size%s'%(msg_size,recv_size))Print(Str (recv_msg,encoding='UTF8'))    #Hang up the phoneS.close ()

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Python---socket module