Okay, let's rephrase my previous question with more code.

I'm successfully sending out an mDNS query with the following code, and I see mDNS replies over tcpdump. But the UDP watcher never fires, or at least the on_recv callback never gets called:

use strict;
use AnyEvent;
#use AnyEvent::DNS;
use AnyEvent::Handle::UDP;
use AnyEvent::Socket ();
use Socket;
# try this

my $cb = sub {};

my($proto) = shift;

my $fqdn = "$proto.local";
#my $data = AnyEvent::DNS::dns_pack { rd => 1, qd => [[$fqdn, "ptr"]] 
+};
my $d = Net::DNS::Packet->new($fqdn, "PTR");
my $data = $d->data;

my($name, $alias, $udp_proto) = AnyEvent::Socket::getprotobyname('udp'
+);
socket my($sock), PF_INET, SOCK_DGRAM, $udp_proto;
AnyEvent::Util::fh_nonblocking $sock, 1;
bind $sock, sockaddr_in(0, Socket::inet_aton('0.0.0.0'));

my %found;
my $callback = sub {};

my $t; 
$t = AnyEvent::Handle::UDP->new(
    fh => $sock,
    #bind => ['0.0.0.0', 5353],
    timeout => 3,
    on_timeout => sub {
print STDERR "WTF? timeout...\n";
        #undef $t;
        #$cb->(values %found);
    },
    on_recv => sub {
print STDERR "callback!!\n";
        my $buf = shift;
        my $handle = shift;
        #my $res = AnyEvent::DNS::dns_unpack $buf;
        my ($res,$err) = Net::DNS::Packet->new(\$buf, 1);

        my @rr  = grep { lc $_->[0] eq $fqdn && $_->[1] eq 'ptr' } @{ 
+$res->{an} };
        my @srv = grep { $_->[1] eq 'srv' } @{$res->{ar}};

        if (@rr == 1 && @srv == 1) {
            my $name = $rr[0]->[3];
            $name =~ s/\.$fqdn$//;

            my $service = {
                name => $name,
                host => $srv[0]->[6],
                port => $srv[0]->[5],
                proto => $proto,
            };

            $found{$rr[0]->[3]} ||= do {
                $callback->($service) if $callback;
                $service;
            };
        }
    },
);

send $sock, $data, 0, sockaddr_in(5353, Socket::inet_aton('224.0.0.251
+'));
#    defined wantarray && AnyEvent::Util::guard { undef $t };

AnyEvent->condvar->recv;
[download]

There are a couple of varieties of packing the message above, both seem to elicit replies, but neither reply gets caught by the AnyEvent::Handle::UDP watcher.

AnyEvent monks, come from your caves and help a lost soul!

Eric.

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