[Tutor] Validating String contains IP address

[Ed Manning]

What's the best way to validate a string contains a IP address 
Sent from my iPad
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Re: [Tutor] Validating String contains IP address

[Ed Manning]

Hello 

what am I going wrong here? i need to validate this is an IP or ask the 
question again 

untrust_ip_address = raw_input('\nEnter the  untrust IP ''"Example 
172.20.2.3/28"'':')
while not ipaddress.ip_network untrust_ip_address:
   untrust_ip_address = raw_input('\nEnter the  untrust IP ''"Example 
172.20.2.3/28"'':')
 
 
> On Apr 1, 2017, at 12:29 PM, Alex Kleider  wrote:
> 
> On 2017-03-31 18:01, Mats Wichmann wrote:
>> On 03/31/2017 06:44 PM, Alex Kleider wrote:
>>> On 2017-03-31 16:35, Ed Manning wrote:
>>>> What's the best way to validate a string contains a IP address
>>>> Sent from my iPad
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>>> The re module perhaps?
> 
>> This assumes "an IP address" is the four dotted numbers characteristic
>> of IPv4. These days that's a bad assumption unless you're absolutely
>> sure an IPv6 address can never appear.  Can you?
> 
> Good point! I hadn't considered IPV6 and didn't know about the ipaddress 
> module.
> Live and learn.

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Re: [Tutor] Validating String contains IP address

[Ed Manning]

Thank you very much 

Sent from my iPhone

> On Apr 3, 2017, at 7:04 PM, Martin A. Brown  wrote:
> 
> 
> Hello there,
> 
>> what am I going wrong here? i need to validate this is an IP or ask 
>> the question again
>> 
>> untrust_ip_address = raw_input('\nEnter the  untrust IP ''"Example 
>> 172.20.2.3/28"'':')
> 
> This is a representation of an IP address along with the mask length for the
> prefix:
> 
>  172.20.2.3/28 
> 
> That is not, strictly speaking an IP, because there is ancillary 
> information included.  This corresponds to:
> 
>  172.20.2.3 IP address
>  172.20.2.0/28  prefix
> 
> The form you are showing is found on some systems, for example in 
> the output from `ip address show` on Linux systems, but it is a 
> commonly understood form.  Look further at the library that I 
> recommended last week, and I think you will find a solution.
> 
>> while not ipaddress.ip_network untrust_ip_address:
>>  untrust_ip_address = raw_input('\nEnter the  untrust IP ''"Example 
>> 172.20.2.3/28"'':')
> 
> You might try using the ipaddress library in the following way:
> 
 i = ipaddress.ip_interface(u'172.20.2.3/28')
 i.ip
>  IPv4Address(u'172.20.2.3')
 i.network
>  IPv4Network(u'172.20.2.0/28')
 i.with_prefixlen
>  u'172.20.2.3/28'
> 
> Good luck,
> 
> -Martin
> 
> -- 
> Martin A. Brown
> http://linux-ip.net/
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