On Thu, 22 Apr 2004, Marc Aurele La France wrote:
> On Tue, 20 Apr 2004, Peter Breitenlohner wrote:
>
> > 2. `getaddrinfo("host", NULL, NULL, &ai)' (as used by xdm) produced a 10sec
> > timeout, whereas `getaddrinfo("host.domain", NULL, NULL, &ai)' as well as
> > `gethostbyname("host")' give an immediate answer.
>
> > 2.1. the glibc-2.[23].x implementation of
> > `getaddrinfo("host", NULL, NULL, &ai)'
> > first queries the nameserver for "host.domain" and then for "host" (whereas
> > `gethostbyname("host")' only queries for "host.domain"). I don't have the
> > slightest idea what's the reason for this pecularity (feature or bug) of
> > getaddrinfo since from the nameserver's point of view a domainname "host"
> > without any dots doesn't make much sense.
> You seem to be implying that "host.domain" isn't resolvable, which doesn't make
> much sense.
That's not what I wanted to say. "host.domain" definitely is resolvable; its
"host" that the nameserver cannot resolve.
`getaddrinfo("host", NULL, NULL, &ai)'
first queries the nameserver for "host.domain" and receives an almost
instantaneous answer(*). Nevertheless it then queries the nameserver for
"host" and depending on circumstances either gets an answer, presumably a
negative one, or a timeout. It then queries again for "host.domain" (to get
additional info or because the first answer was discarded ?) and finally
returns the correct result.
(*) up to this point
`getaddrinfo("host", NULL, NULL, &ai)',
`getaddrinfo("host.domain", NULL, NULL, &ai)', and
`gethostbyname("host")'
basically do the same (although I haven't decoded the DNS packets).
Peter Breitenlohner <[EMAIL PROTECTED]>
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