Python学习笔记1：简单实现ssh客户端和服务端

 1 __author__ = "PyDev2018"
 2 
 3 import socket,os
 4 server = socket.socket()
 5 server.bind((‘127.0.0.1‘,10090))
 6 
 7 server.listen()
 8 
 9 while True:
10     conn,addr = server.accept()
11     print("New conn: ",addr)
12     while True:
13         data = conn.recv(1024)
14         if not data:
15             print("客户端已断开！")
16             break
17         print("执行指令：",data)
18         cmd_res = os.popen(data.decode(‘utf-8‘)).read()
19         print("命令返回值size：",len(cmd_res)) #这里数据有可能为空
20         if len(cmd_res) == 0:
21             cmd_res = "cmd has no output!"
22         conn.send(str(len(cmd_res.encode(‘utf-8‘))).encode("utf-8"))  #先把回显的大小发给客户端,回显可能有中文，先decode一次，防止len错误
23         client_ack = conn.recv(1024) #隔开两次发送数据，防止粘包
24         conn.send(cmd_res.encode(‘utf-8‘))
25         print("命令返回值发送完毕！")
26 server.close()

 1 __author__ = ‘PyDev2018‘
 2 
 3 import socket
 4 client = socket.socket()
 5 
 6 client.connect((‘localhost‘,10090))
 7 
 8 while True:
 9     cmd = input(">>>:").strip()
10     if len(cmd) == 0:continue
11     client.send(cmd.encode("utf-8"))
12     cmd_res_size = client.recv(1024) #接受返回值的大小
13     print("命令返回值的大小为：",cmd_res_size)
14     client.send("已经接收到返回值大小".encode("utf-8"))  #防止粘包
15     received_size = 0 #已经接收到的数据大小
16     received_data = b‘‘ 
17     while received_size < int(cmd_res_size.decode()):
18         data = client.recv(1024)
19         received_size += len(data) #这里记录总接收的数据
20         received_data += data
21         
22     else:
23         print(received_data.decode("utf-8"))
24         print("接收返回值ok!",received_size)
25         
26 
27 client.close()