讓python 3代碼在telnetlib超時後繼續

我試圖直接使用IP地址加載文件，telnet給他們，發送一些命令並保存輸出。我得到它的工作和輸出看起來如預期。讓python 3代碼在telnetlib超時後繼續

我的問題是，如果有一個IP地址在文件中，在無法訪問和telnetlib超時。然後完整的腳本停止。我想忽略超時的IP地址並繼續處理文件的其餘部分。

#!/usr/bin/env python3 

import pexpect 
import getpass 
import telnetlib 
import socket 

ipfile = input("Enter site (IP address file): ") 
user = input("Enter username: ") 
password = getpass.getpass("Enter password") 
outputfile = ((ipfile)+".output") 

f = open(outputfile, 'w') 
f.write("") 
f.close() 

with open(ipfile) as ips: 
    all_ips = [x.rstrip() for x in ips] # get all ips in a list and strip newline 
for ip in all_ips: 
    tn = telnetlib.Telnet(ip,23,2) 
    tn.read_until(b"Username: ") 
    tn.write(user.encode('ascii') + b"\n") 
    if password: 
    tn.read_until(b"Password: ") 
    tn.write(password.encode('ascii') + b"\n") 
    tn.write(b"term len 0\n") 
    tn.write(b"sh inven\n") 
    tn.write(b"logout\n") 
# print(tn.read_all().decode('ascii')) 
    with open(outputfile,"ab") as f: #write to a file 
     f.write(tn.read_all())

我得到的錯誤是

Traceback (most recent call last): 
    File "./test4.py", line 22, in <module> 
    tn = telnetlib.Telnet(ip, 23,2) 
    File "/usr/lib/python3.5/telnetlib.py", line 218, in __init__ 
    self.open(host, port, timeout) 
    File "/usr/lib/python3.5/telnetlib.py", line 234, in open 
    self.sock = socket.create_connection((host, port), timeout) 
    File "/usr/lib/python3.5/socket.py", line 711, in create_connection 
raise err 
    File "/usr/lib/python3.5/socket.py", line 702, in create_connection 
    sock.connect(sa) 
socket.timeout: timed out

來源

2017-09-28 SIMC

如果你特別想趕上一個套接字超時，你可以做以下...

import socket 
import telnetlib 

ip = '127.0.0.1' 

try: 
    tn = telnetlib.Telnet(ip, 23, 2) 
except socket.timeout: 
    print("connection time out caught.") 
    # handle error cases here...

來源

2017-09-28 19:56:28 Kyle

您需要做的唯一事情1.導入套接字模塊。 2.在觸發套接字超時的代碼周圍放置一個「try」「except」塊（看起來像第22行，看着堆棧跟蹤）。 – Kyle

1：導入套接字。完成。 2：我可以把第22行的「嘗試」，這是有道理的。除了我不能確定。如果我把它放在「tn = telnetlib.Telnet（ip，23,2）」下面的第24行中，如果沒有超時，它可以正常工作。我超時發生它再次失敗 – SIMC

我想我得到了它。

#!/usr/bin/env python3 

import pexpect 
import getpass 
import telnetlib 
import socket 

ipfile = input("Enter site (IP address file): ") 
user = input("Enter username: ") 
password = getpass.getpass("Enter password: ") 
outputfile = ((ipfile)+".output") 

f = open(outputfile, 'w') 
f.write("") 
f.close() 

with open(ipfile) as ips: 
    all_ips = [x.rstrip() for x in ips] # get all ips in a list and strip newline 
for ip in all_ips: 
try: 
    tn = telnetlib.Telnet(ip,23,2) 
    tn.read_until(b"Username: ") 
    tn.write(user.encode('ascii') + b"\n") 
    if password: 
    tn.read_until(b"Password: ") 
    tn.write(password.encode('ascii') + b"\n") 
    tn.write(b"term len 0\n") 
    tn.write(b"sh inven\n") 
    tn.write(b"logout\n") 
# print(tn.read_all().decode('ascii')) 
    with open(outputfile,"ab") as f: #write to a fil 
     f.write(tn.read_all()) 
except socket.timeout: 
    print((ip)+" timeout")

來源

2017-09-28 21:11:15 SIMC

讓python 3代碼在telnetlib超時後繼續

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