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如何在Python3中使用telnetlib模塊連接網(wǎng)絡(luò)設(shè)備

更新時(shí)間：2020年09月21日 08:35:40 作者：chier11

這篇文章主要介紹了如何在Python3中使用telnetlib模塊連接網(wǎng)絡(luò)設(shè)備,文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值,需要的朋友可以參考下

Python中專門提供了telnetlib庫(kù)，用來(lái)完成基于telnet協(xié)議的通信功能。

python3下使用telnetlib模塊連接網(wǎng)絡(luò)設(shè)備經(jīng)常會(huì)遇到字節(jié)與字符不匹配的問(wèn)題

問(wèn)題提示如下：

import telnetlib
Host = "10.10.10.10"
# 連接Telnet服務(wù)器
tn = telnetlib.Telnet(Host, port=23, timeout=10)
tn.set_debuglevel(0)

# 輸入登錄用戶名
tn.read_until(b'login: ')
tn.write(b"admin" + b'\n')

# 輸入登錄密碼
tn.read_until(b'Password: ')
tn.write(b"Admin@1234" + b'\n')

tn.read_until(b'#')
tn.write(b"cd /home/sd" + b'\n')

tn.read_until(b'#')
tn.write(b"ls -al" + b'\n')

r = tn.read_until(b'#').decode('ASCII')
r1 = r.split(r"\r\n")
for i in r1:
  print(i)

tn.close()

以下是設(shè)備實(shí)例：

>>> tn=telnetlib.Telnet("10.10.0.6",timeout=2)
>>> tn.read_until(b'login: ',timeout=2)
b"\r\n******************************************************************
****\r\n* Copyright (c) 2004-2018 New H3C Technologies Co., Ltd. All rig
rved.*\r\n* Without the owner's prior written consent,
    *\r\n* no decompiling or reverse-engineering shall be allowed.
     *\r\n**********************************************************
************\r\n\r\nlogin: "
>>> tn.write(b'admin'+b'\n')
>>> tn.read_until(b'Password: ',timeout=2)
b'jgtl\r\r\nPassword: '
>>> tn.write(b'Admin@123'+b'\n')
>>> tn.read_until(b'>')
b'\r\n<bangong-01>'
>>> tn.write(b'ping 10.10.0.7')
>>> tn.read_until(b'>')

以上是命令行執(zhí)行的過(guò)程。寫(xiě)成腳本需要考慮兩個(gè)問(wèn)題，一個(gè)是變量的替換如何編碼解封，一個(gè)是輸出結(jié)果加解碼

#-*- coding:utf-8 -*-
import telnetlib
import re
import csv
import sys
import time
from datetime import datetime

host_dict={
  "ip":"10.10.0.6",
  "user":"admin",
  "pwd":"Admin@123"
}

def get_loss(addrlist):
  host=host_dict["ip"]
  user=host_dict["user"]
  pwd=host_dict["pwd"]
  print (host)
  resultlist = []
  #try:
  tn = telnetlib.Telnet(host, timeout=2)
  print ("AA")
  if len(host_dict["pwd"]) and len(host_dict["user"]):
    print ("BB")
    tn.read_until(b"login: ", timeout=3)
    #tn.write(b"admin"+b"\n")
    tn.write(user.encode()+b"\n")
    tn.read_until(b"Password: ", timeout=3)
    #tn.write(b"Admin@123"+b"\n")
    tn.write(pwd.encode()+ b"\n")
    # p_error = re.compile("found at")

  if tn.read_until(b">", timeout=4).find(b">") != -1:
    print("Connect to {host} ...... ".format(host=host))
    tn.write(b"ping 127.0.0.1\n")
    print (tn.read_until(b'01>'))
  else:
    print("%s Wrong username or password!!!" % host)
    return ""
  #tn.read_until(b">")

  if len(addrlist) != 0:
    for i in range(len(addrlist)-1):
      tep = {}
      command = "ping " + addrlist[i]
      print("command:", command)
      tn.write(command.encode() + b"\n")
      result = str(tn.read_until(b"01>"))
      print(result)
      re_loss = re.compile("\d+\.\d+%")
      loss = re_loss.findall(result)
      tep[host] = loss[0]
      resultlist.append(tep)
      #if p_error.search(result.decode()):
      #  print("There is a error in this command: {0}".format(c.decode()))
  tn.close()
  #except Exception as e:
    #if e:
    #  print ("Connect to {host} Failed!!!".format(host=host),e)
    #return ""
  return resultlist

if __name__=="__main__":
  addrlist=['10.10.0.2','10.10.0.5']
  print ("get_loss",get_loss(addrlist))

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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