Python中专门提供了telnetlib库，用来完成基于telnet协议的通信功能。

python3下使用telnetlib模块连接网络设备经常会遇到字节与字符不匹配的问题

问题提示如下：

import telnetlibHost = "10.10.10.10"# 连接Telnet服务器tn = telnetlib.Telnet(Host, port=23, timeout=10)tn.set_debuglevel(0)# 输入登录用户名tn.read_until(b'login: ')tn.write(b"admin" + b'\n')# 输入登录密码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()

以下是设备实例：

>>> 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 rigrved.*\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'>')

以上是命令行执行的过程。写成脚本需要考虑两个问题，一个是变量的替换如何编码解封，一个是输出结果加解码

#-*- coding:utf-8 -*-import telnetlibimport reimport csvimport sysimport timefrom datetime import datetimehost_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 resultlistif __name__=="__main__": addrlist=['10.10.0.2','10.10.0.5'] print ("get_loss",get_loss(addrlist))

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