如何解决Telnet 设备自动化
我尝试使用 telnet 协议通过 python 连接到设备以执行一些自动化(例如某些旧的 Cisco 路由器), 为此,我正在使用 napalm 库(基于 napalm 库,后者基于 telnetlib 库)
问题是当我直接使用 telnetlib 库时它工作正常,但是当我使用 napalm 或 Netmiko 它给出了这个错误:获取 Telnet 登录失败。
有人遇到过这种情况吗?
PS:我尝试了一些在互联网上找到的解决方案,但没有任何效果。
提前致谢。
此代码有效(telnetlib 库):
import telnetlib
import time
from pprint import pprint
def to_bytes(line):
return f"{line}\n".encode("utf-8")
def send_show_command(ip,username,password,enable,commands):
with telnetlib.Telnet(ip) as telnet:
telnet.read_until(b"Username")
telnet.write(to_bytes(username))
telnet.read_until(b"Password")
telnet.write(to_bytes(password))
index,m,output = telnet.expect([b">",b"#"])
if index == 0:
telnet.write(b"enable\n")
telnet.read_until(b"Password")
telnet.write(to_bytes(enable))
telnet.read_until(b"#",timeout=5)
telnet.write(b"terminal length 0\n")
telnet.read_until(b"#",timeout=5)
time.sleep(3)
telnet.read_very_eager()
result = {}
for command in commands:
telnet.write(to_bytes(command))
output = telnet.read_until(b"#",timeout=5).decode("utf-8")
result[command] = output.replace("\r\n","\n")
return result
if __name__ == "__main__":
devices = ["1.1.1.1"]
commands = ["sh ip int br"]
for ip in devices:
result = send_show_command(ip,"username","password","",commands)
pprint(result,width=120)
from napalm import get_network_driver
from pprint import pprint
driver = get_network_driver('ios')
conn_method = {'port': 23,'transport': 'telnet','global_delay_factor': 2,'secret': ''}
host = '1.1.1.1'
user = 'username'
passwd = 'password'
with driver(hostname=host,username=user,password=passwd,optional_args=conn_method ) as device:
print('Getting facts')
pprint(device.get_facts())
import os
from netmiko import ConnectHandler
switch = {
'device_type': 'cisco_ios_telnet','ip': '1.1.1.1',"username": "username","password": "password","timeout": 15
}
net_connect = ConnectHandler(**switch)
print(net_connect)
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