[erlang-questions] is inet:gethostbyname( IP ) correct?

[Robert Raschke]

This is part of the IP address spec (not sure where to look to find it,
though). I've seen addresses specified like this on and off in various
locations on a wide variety of OSes, for example in a /etc/hosts file you
can write:

localhost  127.1

Robby

On Tue, Oct 13, 2009 at 8:06 PM, caio ariede <caio.ariede@REDACTED> wrote:

> Interesting case.
>
> The result doesn't appear to be an issue, but a feature of the
> gethostbyname
> original implementation, in C code.
>
> You get the same result, testing with PHP:
>
> $ php -r 'var_dump(gethostbyname("12.27"));'
> string(9) "12.0.0.27"
>
> And other interesting results:
>
> $ php -r 'var_dump(gethostbyname("255.2.256"));'
> string(9) "255.2.1.0"
>
> But I can't see where it's really useful.
>
> Caio Ariede
> http://caioariede.com/
>
>
> On Tue, Oct 13, 2009 at 3:15 PM, Garry Hodgson <garry@REDACTED
> >wrote:
>
> > recently, a bug in my code caused us to pass a string
> > representing a floating point number to inet:gethostbyname().
> > i would have expected it to return an error, but instead it
> > returned an ip address, but one that made no sense to me:
> >
> > 1> inet:gethostbyname( '12.27' ).
> > {ok,{hostent,"12.27",[],inet,4,[{12,0,0,27}]}}
> >
> > so my question is, is this behavior correct, and if so, what
> > exactly does it mean that a lookup of '12.27' maps to '12.0.0.27'?
> >
> > thanks
> >
> > --
> > Garry Hodgson
> > Lead Member of Technical Staff
> > AT&T Chief Security Office (CSO)
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