[usocket-devel] Determining the local host address from wildcard host

[Elliott Slaughter]

On Mon, Mar 8, 2010 at 10:50 AM, R. Matthew Emerson <rme at clozure.com> wrote:

>
> On Mar 7, 2010, at 2:36 PM, Elliott Slaughter wrote:
>
> > What I am actually trying to do is to search for other nodes on the local
> network which are also running my application. My idea was to construct one
> or more broadcast addresses, send UDP packets to each of them, and listen
> for responses. This may not be the best way to go about this (and
> suggestions would be appreciated), but if I choose this route, I would want
> to know the IP address of each of the interfaces together with its subnet
> mask.
> >
> > On 2010-03-07, at 07:20 , Elliott Slaughter wrote:
> >
> > if you really need this, you might look at the implementation for
> %get-ip-interfaces in clozure.
> > it uses getifaddrs in a fairly transparent manner, so, if you're
> unix-based, you should be ok with it.
> >
> > I need this to work on Windows and *nix, which is why I can't use IOlib
> or other Unix-based solutions. That said, Clozure does run on Windows, so
> hopefully the code you mentioned has already been ported.
>
> There's an internal function ccl::%get-ip-interfaces that's conditionalized
> for a bunch of platforms.  I can't really recommend that you use it, of
> course, but it might be something to look at.
>

I glanced over the source briefly, and might give porting it to CFFI a shot
when I can find some free time.

I wonder if you could use zeroconf/bonjour?  It sounds like your application
> might be a good fit. There's a reference to a CL interface at
> http://www.cliki.net/CL-ZEROCONF (though I don't know how
> complete/portable it is).
>

I knew about Bonjour but didn't know about the CL interface for it. From
looking around the source, it isn't obvious what it depends on (e.g. does it
need Bonjour to be installed on the system?), although I did find a todo
note saying it doesn't run on Windows yet.

-- 
Elliott Slaughter

"Don't worry about what anybody else is going to do. The best way to predict
the future is to invent it." - Alan Kay
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