Socket_SSH-1

服务器端：

import socket,os
server=socket.socket()
server.bind(('localhost',9999))
server.listen()
while True:
    conn,addr=server.accept()
    print("new conn:",addr)
    while True:
        print("等待新指令")
        data=conn.recv(1024)
        if not data:
            print("客户端已经断开")
            break
        print("执行指令：",data)
        cmd_res=os.popen(data.decode()).read() 
#接收字符串，执行结果也是字符串.os.popen()函数调用系统命令nmap进行扫描,
#但用os.popen就可以读出执行的内容,popen返回的是file read的对象,对其进行读取使用read(),就可看到执行的输出:
        if len(cmd_res)==0:
            cmd_res="cmd has no output.."
        print("before send",len(cmd_res))
        conn.send(cmd_res.encode("utf-8"))
        print("send done")

 客户端：

import socket
client=socket.socket()
client.connect(("localhost",9999))
while True:
    cmd=input(">>:").strip()
    if len(cmd)==0:continue
    client.send(cmd.encode("utf-8"))
    cmd_res=client.recv(1024)
    print(cmd_res.decode())
server.close()

 服务器端运行结果：

new conn: ('127.0.0.1', 64074)
等待新指令
执行指令： b'dir'
before send 466
send done
等待新指令
执行指令： b'pwd'
'pwd' is not recognized as an internal or external command,
operable program or batch file.
before send 19
send done
等待新指令

  客户端运行结果：

>>:dir
b' Volume in drive C is OSDisk
 Volume Serial Number is 002E-D604

 Directory of C:\abccdxddd\Oldboy\Py_Exercise\Day8

08/03/2017  11:18 AM    <DIR>          .
08/03/2017  11:18 AM    <DIR>          ..
08/03/2017  11:17 AM               650 socket_server_ssh.py
08/03/2017  11:18 AM               250 sock_server_client.py
08/02/2017  01:50 PM               187 ????.py
               3 File(s)          1,087 bytes
               2 Dir(s)  146,482,311,168 bytes free
'
>>:pwd
b'cmd has no output..'
>>: