socket练习--ssh

服务器端：

# -*-coding:utf-8-*-
# Author:sunhao

import socket
import os

server = socket.socket()

ip_port = ('127.0.0.1',6969)

server.bind(ip_port)

server.listen()

while True:

    conn,f = server.accept()
    print("new connect:",f)

    while True:
        print("等待新指令")

        data = conn.recv(1024)
        if not data:
            print("客户端断开")

            break
        print("执行指令",data)

        res = os.popen(data.decode()).read()


        print("before send",len(res.encode()))



        if len(res) == 0:
            res = "cmd has bo output"

        conn.send(str(len(res.encode())).encode('utf-8'))   #先发数据大小给客户端    会发生粘包

        client_ack=conn.recv(1024)         #解决粘包

        conn.send(res.encode("utf-8"))

        print("send done")






server.close()

　　

 客户端：

# -*-coding:utf-8-*-
# Author:sunhao


import socket


client = socket.socket()
ip_port = ('127.0.0.1',6969)

client.connect(ip_port)

print("连接开始")
while True:

    command = input(">>>:").strip()

    if len(command) == 0:
        continue

    client.send(command.encode("utf-8"))

    cmd_res_size=client.recv(1024)  #接受命令结果的长度

    print("命令结果的大小",cmd_res_size)

    client.send("准备好接收了".encode('utf-8'))   #解决粘包

    recived_size=0
    recived_data=b''

    while recived_size < int(cmd_res_size.decode()):

        print("----------",cmd_res_size.decode())
        print("##############", type(cmd_res_size.decode()))

        data=client.recv(1024)

        print("&&&&&&&&&&",len(data))

        recived_size += len(data)  #每次收到的有可能小于1024 所以用len判断
        recived_data += data



    else:

        print("cmd recive done",recived_size)

        print(recived_data.decode())




client.close()