Python Socket - Test for devices with Telnet enable

Question

I have a bunch of devices that I have to do an script to know if telnet is enable or not. So I did the following script:

import socket

file = open('list', 'r')
file = file.readlines()
list = []
port = 23 


s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)


for i in file:
    i=i.replace('\n','')
    list.append(i)
for i in host:
    try:
        s.connect((i, port))
        s.shutdown(2)
        print (i+' Telnet is enable') 
    except:
        print (i+' Telnet is disable')

The problem is that after the first test that show telnet is enable, all of the devices are showing as been disable. I check the error that I get and the error is the following:

socket.error: (133, 'Transport endpoint is already connected')

I know that has to do with closing the first session, but I'm not able to. Thanks in advance

if I do s.close() and then I try to open a new one, I get this error 'socket.error: (9, 'Bad file descriptor')' — amb1s1
– amb1s1, Commented Mar 4, 2013 at 14:45
@amb1s1 You'll need to close the old socket and create a new one, ie put the s = socket.socket(... inside the loop. — Joachim Isaksson
– Joachim Isaksson, Commented Mar 4, 2013 at 14:47

2 revs · Accepted Answer · 2020-06-20 09:12:55Z

0

Since feature requests to mark a comment as an answer remain declined, I copy the above solution here.

You'll need to close the old socket and create a new one, ie put the s = socket.socket(... inside the loop. – Joachim Isaksson

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