Paramiko 读取 SSH 协议横幅时出错

Question

我在处理此错误时遇到问题：“读取 SSH 协议横幅时出错”+ str(e) paramiko.ssh_exception.SSHException：读取 SSH 协议横幅时出错。

这是我正在尝试运行的代码：

from netmiko import ConnectHandler

from netmiko.ssh_exception import  NetMikoTimeoutException
from paramiko.ssh_exception import SSHException



ip_list = ['192.168.1.77','192.168.1.73','192.168.1.75','192.168.1.74']
for ip in ip_list:
    cisco = {
        'device_type': 'cisco_ios',
        'host':   ip,
        'username': 'gianluca',
        'password': 'gianluca',
        'secret': 'gianluca',
        "fast_cli": False
    }
    try:
        net_connect = ConnectHandler(**cisco)
    except NetMikoTimeoutException:
        print(f'Machine with ip address {ip} is not reachable')
        continue

    except SSHException:
    
        print(f'Ssh not enabled on Machine with ip address {ip}')
        continue

    except:
        print(f'Oops, something went wrong on the Machine with ip address {ip}!')
        continue

    net_connect.enable()   
    net_connect.send_config_from_file('bbb.txt')
    print(f'Machine with ip address {ip} was configured correctly')

但是当我到达一台没有启用 ssh 的机器时，我收到一条大的红色错误消息，如下所示：

Exception: Error reading SSH protocol banner
Traceback (most recent call last):
  File "C:\Users\gianluca.platania\AppData\Local\Programs\Thonny\lib\site-packages\paramiko\transport.py", line 2211, in _check_banner
    buf = self.packetizer.readline(timeout)
  File "C:\Users\gianluca.platania\AppData\Local\Programs\Thonny\lib\site-packages\paramiko\packet.py", line 380, in readline
    buf += self._read_timeout(timeout)
  File "C:\Users\gianluca.platania\AppData\Local\Programs\Thonny\lib\site-packages\paramiko\packet.py", line 609, in _read_timeout
    raise EOFError()
EOFError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\gianluca.platania\AppData\Local\Programs\Thonny\lib\site-packages\paramiko\transport.py", line 2039, in run
    self._check_banner()
  File "C:\Users\gianluca.platania\AppData\Local\Programs\Thonny\lib\site-packages\paramiko\transport.py", line 2216, in _check_banner
    "Error reading SSH protocol banner" + str(e)
paramiko.ssh_exception.SSHException: Error reading SSH protocol banner

我试图不让它出现在处理异常，但似乎没有任何作用。有什么想法吗？

PS：我在 thonny 上也遇到这个错误： 未安装“paramiko.ssh_exception”的库存根（或与 Python 3.7 不兼容）

Answer 1

在我看来，问题在于你永远不会关闭或断开连接。因此，您必须使用 try 和 finally 语句断开每个连接

net_connect = None
try:
   net_connect = ConnectHandler(**cisco)
   
finally:
   if net_connect:
       net_connect.disconnect()

有关更多信息，请阅读 文档

注意：finally 块总是被调用，无论是否产生异常