Python实现限制主机登录

import paramiko
import datetime 
import time
f=open('./hostnames.txt','r') #准备主机文件，一台主机占一行
hostnames=f.readlines()

for hostname in hostnames:
    hostname=hostname.strip()
    ssh_client=paramiko.SSHClient()
    ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh_client.connect(hostname=hostname,username='python',password='123456')  #连接登录网络设备
    print('Sucessfully conneted to ',hostname)

    cmd=ssh_client.invoke_shell()
    cmd.send('sys\n')

    cmd.send('acl number 3000\n')
    cmd.send(f'rule 10 permit ip source 192.168.99.0 0.0.0.255 destination {hostname} 0\n')
    cmd.send('rule 20 deny ip\n')                                  #通过ACL规则只允许源地址为192.168.99.0网段的主机连接

    cmd.send('user-interface vty 0 4\n')                            
    cmd.send('acl 3000 inbound\n')


    cmd.send('rsa local-key-pair  create\n')
    cmd.send('y\n')
    cmd.send('2048\n')

    result=cmd.recv(66666)
    result=result.decode('ascii')
    print(result)
    
    print('The operation has finished!!!')
    
    time.sleep(2)
    ssh_client.close()