坚持使用Python中的read_all()函数

Question

我用python编写了一个小代码，使用telnet库自动执行多个思科路由器上的配置任务。在第一次迭代中一切正常，问题是我在函数 read_all（） 的第二次迭代中超时。如果我从 telnetlib 中删除超时参数。Telnet（） 函数，我永远停留在同一个迭代中。

from telnet import telnet
import xlrd
class handler:
 excel_sheet=None
 ipv4_devices=None
 ipv6_devices=None
 config=None
 telnet=None
def __init__(self):
 self.excel_sheet = xlrd.open_workbook("ipv4_devices.xlsx")
 self.config=open("config.txt","r")
 output_init = open("output.txt","w+")
 output_init.write("")
 output_init.close()  
def execute(self):
 row = None
 column = None
 self.ipv4_devices = self.excel_sheet.sheet_by_index(0)
 for row in range(self.ipv4_devices.nrows-1):
  self.telnet = telnet(self.ipv4_devices.cell_value(row+1,0),self.ipv4_devices.cell_value(row+1,1), self.ipv4_devices.cell_value(row+1,2), self.ipv4_devices.cell_value(row+1,3), self.config)
 self.telnet.do_telnet()
 self.telnet=None
self.config.close()

上面是我的 Handler.py 文件，它反过来调用我的 telnet.py 文件，其中包含实际的telnet代码。

import sys
import telnetlib
class telnet:
 ipv4_address=None
 port=0
 username=None 
 passphrase=None
 config=None
 def __init__(self, ipv4_address=None, port=23, username=None, passphrase=None, config=None):
  if (ipv4_address is not None) and (username is not None) and (passphrase is not None) and (config is not None) : 
   self.ipv4_address = ipv4_address
   self.port = port
   self.username = username
   self.passphrase = passphrase
   self.config = config
  else:
   exit()  
 def do_telnet(self):
  output = open("output.txt","a")
  remote= telnetlib.Telnet(self.ipv4_address,int(self.port))
  remote.read_until("Username: ")
  remote.write(self.username.encode('ascii')+"n")
  remote.read_until("Password: ")
  remote.write(self.passphrase.encode('ascii')+"n")
  remote.write(self.config.read().encode('ascii')+"n")
  output.write(remote.read_all()+"n"+"  -------  "+"n")
  remote.close()
  output.close()

下面是我超时时收到的错误

Traceback (most recent call last):
  File "Automate.py", line 5, in <module>
    automate_it.execute()
  File "/home/abdultayyeb/Desktop/Automation/handler.py", line 30, in execute
    self.telnet.do_telnet()
  File "/home/abdultayyeb/Desktop/Automation/telnet.py", line 31, in do_telnet
    output.write(remote.read_all()+"n"+"  -------  "+"n")
  File "/usr/lib/python2.7/telnetlib.py", line 385, in read_all
    self.fill_rawq()
  File "/usr/lib/python2.7/telnetlib.py", line 576, in fill_rawq
    buf = self.sock.recv(50)
  socket.timeout: timed out

Answer 1

我建议重写它以使用netmiko，因为它将处理处理Cisco IOS的特殊性。

关键是将您的设备类型指定为 cisco_ios_telnet .

这将具有额外的好处，即在将系统转换为SSH时无需重写代码。 您只需将设备类型从cisco_ios_telnet更改为cisco_ios

https://pynet.twb-tech.com/blog/automation/netmiko.html