AnyEvent resolves hostnames always via DNS

[Piotr Roszatycki]

Hi.

Yesterday I noticed, that AnyEvent::Socket::resolve_sockaddr works
different than on every Linux box
and it lookups DNS even if address is in /etc/hosts.

The most default configuration of Name Service Switch:

  $ grep hosts /etc/nsswitch.conf
  hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4

The order of resolving a socket address is important because
/etc/hosts works even if i.e. nameserver is unavailable (problem with
network or DNS itself, firewalled intranet, etc.). It also makes a
possible local overring (spoofing) some addresses outside our network.

AnyEvent works differently: it uses DNS even if address is already
found in /etc/hosts. AnyEvent::DNS reads /etc/resolv.conf and uses its
options so I think /etc/nsswitch.conf might honor it too. At least
some $ENV{PERL_ANYEVENT_*} settings could disable mandatory DNS
lookup.

Is it possible to change the default AnyEvent's behavior and make some
applications working without DNS?

Thanks.
-- 
 .''`.    Piotr Roszatycki
: :' :    mailto:Piotr.Roszatycki at gmail.com
`. `'     mailto:dexter at cpan.org
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