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

info <>
Wed Oct 14 15:34:12 CEST 2009


For me this function always returns {error,timeout} and I didn't find the reason even with the help of Raimo Niskanen !


At the end of my last mail you have the references.
Regards,

Roberto Aloi
Erlang Training and Consulting Ltd.
http://www.erlang-consulting.com
http://aloiroberto.wordpress.com

Robert Raschke wrote:
> 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  < > 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  <
> >     
> > > 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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> > >       
>
>   


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