Come risolvere DNS in Python?

Question

Ho uno script DNS che consentono agli utenti di risolvere i nomi DNS da nomi di siti web digitando su un comando di Windows pronta.

Ho guardato attraverso diverse guide sulla risoluzione DNS, ma il mio script non posso ancora sembrano risolvere i nomi (www.google.com) o (google.com) a indirizzo IP.

Lo script genera un errore di

Traceback (most recent call last):
  File "C:\python\main_menu.py", line 37, in ?
    execfile('C:\python\showdns.py')
  File "C:\python\showdns.py", line 3, in ?
    x = input ("\nPlease enter a domain name that you wish to translate: ")
  File "<string>", line 0, in ?
NameError: name 'google' is not defined

Il codice:

import socket

x = input ("\nPlease enter a domain name that you wish to translate: ")

print ("\n\nThe IP Address of the Domain Name is: "+socket.gethostbyname_ex(x))

x = raw_input("\nSelect enter to proceed back to Main Menu\n")
if x == '1': 
execfile('C:\python\main_menu.py')

Si prega di dare consigli sui codici. Grazie!

Answer 1

input () è la funzione sbagliato usare qui. Si valuta in realtà la stringa che l'utente ha inserito.

gethostbyname_ex rendimenti molto più di una stringa. Così la vostra istruzione di stampa avrebbe fallito anche.

Nel vostro caso questo codice dovrebbe funzionare:

import socket

x = raw_input ("\nPlease enter a domain name that you wish to translate: ")  

data = socket.gethostbyname_ex(x)
print ("\n\nThe IP Address of the Domain Name is: "+repr(data))  

x = raw_input("\nSelect enter to proceed back to Main Menu\n")  
if x == '1':   
    execfile('C:\python\main_menu.py')  

Answer 2

#!/user/bin/env python
"""
Resolve the DNS/IP address of a given domain
data returned is in the format:
(name, aliaslist, addresslist)
@filename resolveDNS.py
@version 1.01 (python ver 2.7.3)
@author LoanWolffe
"""
import socket

def getIP(d):
    """
    This method returns the first IP address string
    that responds as the given domain name
    """
    try:
        data = socket.gethostbyname(d)
        ip = repr(data)
        return ip
    except Exception:
        # fail gracefully!
        return False
#
def getIPx(d):
    """
    This method returns an array containing
    one or more IP address strings that respond
    as the given domain name
    """
    try:
        data = socket.gethostbyname_ex(d)
        ipx = repr(data[2])
        return ipx
    except Exception:
        # fail gracefully!
        return False
#
def getHost(ip):
    """
    This method returns the 'True Host' name for a
    given IP address
    """
    try:
        data = socket.gethostbyaddr(ip)
        host = repr(data[0])
        return host
    except Exception:
        # fail gracefully
        return False
#
def getAlias(d):
    """
    This method returns an array containing
    a list of aliases for the given domain
    """
    try:
        data = socket.gethostbyname_ex(d)
        alias = repr(data[1])
        #print repr(data)
        return alias
    except Exception:
        # fail gracefully
        return False
#

# test it

x = raw_input("Domain name or IP address? > ")


a = getIP(x)
b = getIPx(x)
c = getHost(x)
d = getAlias(x)

print " IP ", a
print " IPx ", b
print " Host ", c
print " Alias ", d

Answer 3

Usa raw_input invece di input.