| 1 |
=head1 NAME |
| 2 |
|
| 3 |
EV::ADNS - lightweight asynchronous dns queries using EV and libadns |
| 4 |
|
| 5 |
=head1 SYNOPSIS |
| 6 |
|
| 7 |
use EV; |
| 8 |
use EV::ADNS; |
| 9 |
|
| 10 |
EV::ADNS::submit "example.com", EV::ADNS::r_a, 0, sub { |
| 11 |
my ($status, $expires, @a) = @_; |
| 12 |
warn $a[0]; # "127.13.166.3" etc. |
| 13 |
}; |
| 14 |
|
| 15 |
EV::loop; |
| 16 |
|
| 17 |
=head1 DESCRIPTION |
| 18 |
|
| 19 |
This is a simple interface to libadns (asynchronous dns) that |
| 20 |
integrates well and automatically into the EV event loop. The |
| 21 |
documentation for libadns is vital to understand this module, see |
| 22 |
L<http://www.chiark.greenend.org.uk/~ian/adns/>. |
| 23 |
|
| 24 |
You can use it only with EV (directly or indirectly, e.g. via |
| 25 |
L<Glib::EV>). Apart from loading and using the C<submit> function you need |
| 26 |
not do anything (except run an EV event loop). |
| 27 |
|
| 28 |
=head1 OVERVIEW |
| 29 |
|
| 30 |
All the constants/enums from F<adns.h> are available in the EV::ADNS |
| 31 |
namespace, without the C<adns_> prefix, e.g. C<adns_r_a> becomes |
| 32 |
C<EV::ADNS::r_a>, C<adns__qtf_deref> becomes C<EV::ADNS::_qtf_deref> and |
| 33 |
so on. |
| 34 |
|
| 35 |
=head1 FUNCTIONS |
| 36 |
|
| 37 |
=over 4 |
| 38 |
|
| 39 |
=item $query = EV::ADNS::submit "domain", $rrtype, $flags, $cb |
| 40 |
|
| 41 |
Submits a new request to be handled. See the C<adns_submit> C function |
| 42 |
description for more details. The function optionally returns a query |
| 43 |
object which can be used to cancel an in-progress request. You do not need |
| 44 |
to store the query object, even if you ignore it the query will proceed. |
| 45 |
|
| 46 |
The callback will be invoked with a result status, the time the resource |
| 47 |
record validity expires and zero or more resource records, one scalar per |
| 48 |
result record. Example: |
| 49 |
|
| 50 |
sub adns_cb { |
| 51 |
my ($status, $expires, @rr) = @_; |
| 52 |
if ($status == EV::ADNS::s_ok) { |
| 53 |
use JSON::XS; |
| 54 |
warn to_json \@rr; |
| 55 |
} |
| 56 |
} |
| 57 |
|
| 58 |
The format of result records varies considerably, here is some cursory |
| 59 |
documentation of how each record will look like, depending on the query |
| 60 |
type: |
| 61 |
|
| 62 |
=over 4 |
| 63 |
|
| 64 |
=item EV::ADNS::rr_a |
| 65 |
|
| 66 |
An IPv4 address in dotted quad (string) form. |
| 67 |
|
| 68 |
=item EV::ADNS::r_ns_raw, EV::ADNS::r_cname, EV::ADNS::r_ptr, EV::ADNS::r_ptr_raw |
| 69 |
|
| 70 |
The resource record as a simple string. |
| 71 |
|
| 72 |
=item EV::ADNS::r_txt |
| 73 |
|
| 74 |
An arrayref of strings. |
| 75 |
|
| 76 |
=item EV::ADNS::r_ns |
| 77 |
|
| 78 |
A "host address", a hostname with any number of addresses (hint records). |
| 79 |
|
| 80 |
Currently only the hostname will be stored, so this is alway an arrayref |
| 81 |
with a single element of the hostname. Future versions might add |
| 82 |
additional address entries. |
| 83 |
|
| 84 |
=item EV::ADNS::r_hinfo |
| 85 |
|
| 86 |
An arrayref consisting of the two strings. |
| 87 |
|
| 88 |
=item EV::ADNS::r_rp, EV::ADNS::r_rp_raw |
| 89 |
|
| 90 |
An arrayref with two strings. |
| 91 |
|
| 92 |
=item EV::ADNS::r_mx |
| 93 |
|
| 94 |
An arrayref consisting of the priority and a "host address" (see |
| 95 |
C<EV::ADNS::r_ns>). Example: |
| 96 |
|
| 97 |
[10, "mail10.example.com"] |
| 98 |
|
| 99 |
=item EV::ADNS::r_mx_raw |
| 100 |
|
| 101 |
An arrayref consisting of the priority and the hostname, e.g. C<[10, |
| 102 |
"mail.example.com"]>. |
| 103 |
|
| 104 |
=item EV::ADNS::r_soa, EV::ADNS::r_soa_raw |
| 105 |
|
| 106 |
An arrayref consisting of the primary nameserver, admin name, serial, |
| 107 |
refresh, retry expire and minimum times, e.g.: |
| 108 |
|
| 109 |
["ns.example.net", "hostmaster@example.net", 2000001102, 86400, 21600, 2592000, 172800] |
| 110 |
|
| 111 |
The "raw" form doesn't mangle the e-mail address. |
| 112 |
|
| 113 |
=item EV::ADNS::r_srv_raw |
| 114 |
|
| 115 |
An arrayref consisting of the priority, weight, port and hostname, e.g.: |
| 116 |
|
| 117 |
[10, 10, 5060, "sip1.example.net"] |
| 118 |
|
| 119 |
=item EV::ADNS::r_srv |
| 120 |
|
| 121 |
The same as C<EV::ADNS::r_srv_raw>, but the hostname is replaced by a "host |
| 122 |
address" (see C<EV::ADNS::r_ns>). |
| 123 |
|
| 124 |
=item EV::ADNS::r_unknown |
| 125 |
|
| 126 |
A single octet string with the raw contents. |
| 127 |
|
| 128 |
=item anything else |
| 129 |
|
| 130 |
Currently C<undef>. |
| 131 |
|
| 132 |
=back |
| 133 |
|
| 134 |
=item $query->cancel |
| 135 |
|
| 136 |
Cancels a request that is in progress. |
| 137 |
|
| 138 |
=back |
| 139 |
|
| 140 |
=cut |
| 141 |
|
| 142 |
package EV::ADNS; |
| 143 |
|
| 144 |
use Carp (); |
| 145 |
use EV (); |
| 146 |
|
| 147 |
BEGIN { |
| 148 |
$VERSION = '0.3'; |
| 149 |
|
| 150 |
require XSLoader; |
| 151 |
XSLoader::load (EV::ADNS, $VERSION); |
| 152 |
} |
| 153 |
|
| 154 |
=head1 SEE ALSO |
| 155 |
|
| 156 |
L<EV>, L<Net::ADNS> another interface to adns, maybe better, but without |
| 157 |
real support to integrate it into other event loops. |
| 158 |
|
| 159 |
=head1 AUTHOR |
| 160 |
|
| 161 |
Marc Lehmann <schmorp@schmorp.de> |
| 162 |
http://home.schmorp.de/ |
| 163 |
|
| 164 |
=cut |
| 165 |
|
| 166 |
1 |
| 167 |
|
