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

info <>
Thu Oct 15 15:02:40 CEST 2009


Dear Raimo,
I can resume: I discovered that gethostbyname call inet_gethost.c 
I don't understand inet_gethost.c :-(
Where "goes" this problem for finding the information ?
If we know where and what, we could perhaps find what is missing in my windows 2003 ...
Hope to read you soon !
John

On Wed, Oct 14, 2009 at 03:34:12PM +0200, info wrote:
> For me this function always returns {error,timeout} and I didn't find the reason even with the help of Raimo Niskanen !

Sorry about that, but your problem became a just too spooky
Windows 2003 problem and that is not really my turf, and
you seemed to have a possible workaround through inet_res.
But it has been on my todo list to have a second look
at the whole conversation when I could find the time...

> 
> 
> 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)
>  >  >  >
>  >  >  > "This e-mail and any files transmitted with it are AT&T property, are
>  >  >  > confidential, and are intended solely for the use of the individual or
>  >  >  > entity to whom this e-mail is addressed. If you are not one of the named
>  >  >  > recipient(s) or otherwise have reason to believe that you have received
>  >  >  >       
>  >  > this
>  >  >     
>  >  >  > message in error, please notify the sender and delete this message
>  >  >  > immediately from your computer. Any other use, retention, dissemination,
>  >  >  > forwarding, printing, or copying of this e-mail is strictly prohibited."
>  >  >  >
>  >  >  > ________________________________________________________________
>  >  >  > erlang-questions mailing list. See http://www.erlang.org/faq.html
>  >  >  > erlang-questions (at) erlang.org
>  >  >  >
>  >  >  >
>  >  >  >       
>  >
>  >   
> 
> 
> ________________________________________________________________
> erlang-questions mailing list. See http://www.erlang.org/faq.html
> erlang-questions (at) erlang.org

-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB

________________________________________________________________
erlang-questions mailing list. See http://www.erlang.org/faq.html
erlang-questions (at) erlang.org


More information about the erlang-questions mailing list