#!/usr/bin/perl
use strict;
use warnings;
use IO::Async::Loop;
use IO::Async::Resolver::DNS;
my $loop = IO::Async::Loop->new;
my $resolver = $loop->resolver;
$resolver->res_query(
dname => $ARGV[0],
type => "MX",
on_resolved => sub {
my ( $pkt, @mxes ) = @_;
foreach my $mx ( @mxes ) {
printf "preference=%d exchange=%s\n",
$mx->{preference}, $mx->{exchange};
if( my $addresses = $mx->{address} ) {
printf " address=%s\n", $_ for @$addresses;
}
else {
print " address unknown\n";
}
}
$loop->stop;
},
on_error => sub { die "Cannot resolve - $_[-1]" },
);
$loop->run;