如何在 Python 中解析 DNS？
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How to resolve DNS in Python?
提问by JavaNoob
I have a DNS script which allow users to resolve DNS names by typing website names on a Windows command prompt.
我有一个 DNS 脚本，它允许用户通过在 Windows 命令提示符下键入网站名称来解析 DNS 名称。
I have looked through several guides on the DNS resolve but my script can't still seem to resolve the names (www.google.com) or (google.com) to IP address.
我已经浏览了几个关于 DNS 解析的指南，但我的脚本似乎仍然无法将名称 (www.google.com) 或 (google.com) 解析为 IP 地址。
The script outputs an error of
该脚本输出错误
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
The code:
编码：
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')
Please give advice on the codes. Thanks!
请提供有关代码的建议。谢谢！
采纳答案by Patrice Neff
input() is the wrong function to use here. It actually evaluates the string that the user entered.
input() 是在这里使用的错误函数。它实际上评估用户输入的字符串。
Also gethostbyname_exreturns more than just a string. So your print statement would also have failed.
此外gethostbyname_ex回报不仅仅是一个字符串。所以你的打印语句也会失败。
In your case this code should work:
在您的情况下，此代码应该有效：
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')
回答by Alan Haggai Alavi
Use raw_inputinstead of input.
使用raw_input代替input。
回答by Loanwolffe
#!/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
