dynamic dns update

[Jason Schoon]

On 7/26/06, Paul Fox <pgf at brightstareng.com> wrote:
>
> > >  > The busybox client does have the necessary option to tell the
> > >  > server to do this.  It is (currently) undocumented in the
> > >  > usage, but if you specify a -F <domain name> the client will
> > >  > pass the information to the server and tell it to an update.
> > >
> > > well, looky there.  you're absolutely right.  thanks.  i didn't
> > > realize we had that.
> >
> > I'd like to add this to the docs, but the code comment is a
> > bit vague.  (dns format not fqdn?)
>
> i suspect the first data item in the dhcp option is a flags word,
> which we set to '1', meaning "client requests both A and RR
> records".  the other three bits referred to in that comment are
> unimplemented in our code.  "dns format" in this case refers to
> the counted-string domainname representation that the DNS
> protocol uses, where there are no dots in the data, but instead a
> byte is used as a counter for every name part.  hence the
> "<4>host<6>domain..." etc part of the comment.
>
> >
> > Can you just go "-F thingy.google.com" and expect udhcpc to work right?
>
> i'll defer to jason on this, since i've never tried it.
>
>
That "should" work (i.e. -F thingy.google.com), that is how I implemented it
when I added this functionality to my own DHCP client.  I am still in the
process of switching over to use udhcpc instead, but I have only "ethereal"
tested it, not against a server that supports DDNS yet.
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