NAME
EV::ADNS - lightweight asynchronous dns queries using EV and libadns
SYNOPSIS
use EV;
use EV::ADNS;
EV::ADNS::submit "example.com", EV::ADNS::r_a, 0, sub {
my ($status, $expires, @a) = @_;
warn $a[0]; # "127.13.166.3" etc.
};
EV::loop;
DESCRIPTION
This is a simple interface to libadns (asynchronous dns) that integrates
well and automatically into the EV event loop. The documentation for
libadns is vital to understand this module, see
.
You can use it only with EV (directly or indirectly, e.g. via Glib::EV).
Apart from loading and using the "submit" function you need not do
anything (except run an EV event loop).
OVERVIEW
All the constants/enums from adns.h are available in the EV::ADNS
namespace, without the "adns_" prefix, e.g. "adns_r_a" becomes
"EV::ADNS::r_a", "adns__qtf_deref" becomes "EV::ADNS::_qtf_deref" and so
on.
FUNCTIONS
$query = EV::ADNS::submit "domain", $rrtype, $flags, $cb
Submits a new request to be handled. See the "adns_submit" C
function description for more details. The function optionally
returns a query object which can be used to cancel an in-progress
request. You do not need to store the query object, even if you
ignore it the query will proceed.
The callback will be invoked with a result status, the time the
resource record validity expires and zero or more resource records,
one scalar per result record. Example:
sub adns_cb {
my ($status, $expires, @rr) = @_;
if ($status == EV::ADNS::s_ok) {
use JSON::XS;
warn to_json \@rr;
}
}
The format of result records varies considerably, here is some
cursory documentation of how each record will look like, depending
on the query type:
EV::ADNS::rr_a
An IPv4 address in dotted quad (string) form.
EV::ADNS::r_ns_raw, EV::ADNS::r_cname, EV::ADNS::r_ptr,
EV::ADNS::r_ptr_raw
The resource record as a simple string.
EV::ADNS::r_txt
An arrayref of strings.
EV::ADNS::r_ns
A "host address", a hostname with any number of addresses (hint
records).
Currently only the hostname will be stored, so this is alway an
arrayref with a single element of the hostname. Future versions
might add additional address entries.
EV::ADNS::r_hinfo
An arrayref consisting of the two strings.
EV::ADNS::r_rp, EV::ADNS::r_rp_raw
An arrayref with two strings.
EV::ADNS::r_mx
An arrayref consisting of the priority and a "host address" (see
"EV::ADNS::r_ns"). Example:
[10, "mail10.example.com"]
EV::ADNS::r_mx_raw
An arrayref consisting of the priority and the hostname, e.g.
"[10, "mail.example.com"]".
EV::ADNS::r_soa, EV::ADNS::r_soa_raw
An arrayref consisting of the primary nameserver, admin name,
serial, refresh, retry expire and minimum times, e.g.:
["ns.example.net", "hostmaster@example.net", 2000001102, 86400, 21600, 2592000, 172800]
The "raw" form doesn't mangle the e-mail address.
EV::ADNS::r_srv_raw
An arrayref consisting of the priority, weight, port and
hostname, e.g.:
[10, 10, 5060, "sip1.example.net"]
EV::ADNS::r_srv
The same as "EV::ADNS::r_srv_raw", but the hostname is replaced
by a "host address" (see "EV::ADNS::r_ns").
EV::ADNS::r_unknown
A single octet string with the raw contents.
anything else
Currently "undef".
$query->cancel
Cancels a request that is in progress.
SEE ALSO
EV, Net::ADNS another interface to adns, maybe better, but without real
support to integrate it into other event loops.
AUTHOR
Marc Lehmann
http://home.schmorp.de/