NAME

AnyEvent::DNS::EtcHosts - Use /etc/hosts before DNS

SYNOPSIS

  use AnyEvent::DNS::EtcHosts;

  use AnyEvent::DNS;
  my $cv = AE::cv;
  AnyEvent::DNS::any 'example.com', sub {
      say foreach map { $_->[4] } grep { $_->[1] =~ /^(a|aaaa)$/ } @_;
      $cv->send;
  };

  use AnyEvent::Socket;
  my $cv = AE::cv;
  AnyEvent::Socket::resolve_sockaddr $domain, $service, $proto, $family, undef, sub {
      say foreach map { format_address((AnyEvent::Socket::unpack_sockaddr($_->[3]))[1]) } @_;
      $cv->send;
  };

DESCRIPTION

AnyEvent::DNS::EtcHosts changes AnyEvent::DNS behavior. The /etc/hosts file is searched before DNS, so it is possible to override DNS entries.

The DNS lookups are emulated. This resolver returns the standard DNS reply based on /etc/hosts file rather than real DNS.

You can choose different file by changing PERL_ANYEVENT_HOSTS environment variable.

This module also disables original AnyEvent::Socket's helper function which reads /etc/hosts file after DNS entry was not found. It prevents to read this file twice.

The AnyEvent::Socket resolver searches IPv4 and IPv6 addresses separately. If you don't want to check the addresses in DNS, both IPv4 and IPv6 addresses should be placed in /etc/hosts or the protocol family should be set explicitly for resolve_sockaddr function.

IMPORTS

use AnyEvent::DNS::EtcHosts %args;

  use AnyEvent::DNS::EtcHosts server => '8.8.8.8';

  $ perl -MAnyEvent::DNS::EtcHosts script.pl

Enables this module globally. Additional arguments will be passed to AnyEvent::DNS constructor.

no AnyEvent::DNS::EtcHosts;

Disables this module globally.

METHODS

register

  require AnyEvent::DNS::EtcHosts;

  $guard = AnyEvent::DNS::EtcHosts->register(%args);

  undef $guard;

Enables this module in lexical scope. The module will be disabled out of scope. Additional arguments will be passed to AnyEvent::DNS constructor.

If you want to use AnyEvent::DNS::EtcHosts in lexical scope only, you should use require rather than use keyword, because import method enables AnyEvent::DNS::EtcHosts globally.

request

  $resolver->request($req, $cb->($res))

This is wrapper for AnyEvent::DNS->request method.

SEE ALSO

AnyEvent::DNS, AnyEvent::Socket.

BUGS

This module might be incompatible with further versions of AnyEvent module.

If you find the bug or want to implement new features, please report it at https://github.com/dex4er/perl-AnyEvent-DNS-EtcHosts/issues

The code repository is available at http://github.com/dex4er/perl-AnyEvent-DNS-EtcHosts

AUTHORS

Piotr Roszatycki <dexter@cpan.org>

Helper functions taken from AnyEvent::Socket 7.05 by Marc Lehmann <schmorp@schmorp.de>

LICENSE

Copyright (c) 2013 Piotr Roszatycki <dexter@cpan.org>.

This is free software; you can redistribute it and/or modify it under the same terms as perl itself.

See http://dev.perl.org/licenses/artistic.html

cpanm AnyEvent::DNS::EtcHosts

perl -MCPAN -e shell
install AnyEvent::DNS::EtcHosts