EV-ADNS/ADNS.pm

=head1 NAME

EV::ADNS - lightweight asynchronous dns queries using EV and libadns

=head1 SYNOPSIS

 use EV;
 use EV::ADNS;

 EV::ADNS::submit "example.com", EV::ADNS::r_addr, EV::ADNS::qf_cname_loose, sub {
    my ($status, $expires, @a) = @_;
    warn $a[0]; # "127.13.166.3" etc.
 };

 EV::run;

=head1 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
L<http://www.chiark.greenend.org.uk/~ian/adns/>.

You can use it only with EV (directly or indirectly, e.g. via
L<Glib::EV>). Apart from loading and using the C<submit> function you need
not do anything (except run an EV event loop).

=head1 OVERVIEW

All the constants/enums from F<adns.h> are available in the EV::ADNS
namespace, without the C<adns_> prefix, i.e. C<adns_r_a> becomes
C<EV::ADNS::r_a> and so on.

=head1 FUNCTIONS

=over 4

=item $query = EV::ADNS::submit "domain", $rrtype, $flags, $cb

Submits a new request to be handled. See the C<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 encode_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:

=over 4

=item EV::ADNS::r_addr

IPv4 and/or IPV6 addresses in string form.

=item EV::ADNS::r_a

IPv4 addresses in dotted quad (string) form.

=item EV::ADNS::r_aaaa

IPv6 addresses in string form.

=item 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.

=item EV::ADNS::r_txt

An arrayref of strings.

=item EV::ADNS::r_ns

A "host address", a hostname with any number of addresses (hint records).

The record will be an arrayref with domainname, adns status and any number
of associated addresses: C<< ["domain", adns_status, addr...] >>.

=item EV::ADNS::r_hinfo

An arrayref consisting of the two strings.

=item EV::ADNS::r_rp, EV::ADNS::r_rp_raw

An arrayref with two strings.

=item EV::ADNS::r_mx

An arrayref consisting of the priority and a "host address" (see
C<EV::ADNS::r_ns>). Example:

   [10, [["alt3.aspmx.l.google.com", 0, "64.233.189.27", "2404:6800:4008:c07::1a"]]]

=item EV::ADNS::r_mx_raw

An arrayref consisting of the priority and the hostname, e.g. C<[10,
"mail.example.com"]>.

=item 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.

=item EV::ADNS::r_srv_raw

An arrayref consisting of the priority, weight, port and hostname, e.g.:

   [10, 10, 5060, "sip1.example.net"]

=item EV::ADNS::r_srv

The same as C<EV::ADNS::r_srv_raw>, but the hostname is replaced by a "host
address" (see C<EV::ADNS::r_ns>).

=item EV::ADNS::r_unknown

A single octet string with the raw contents.

=item anything else

Currently C<undef>.

=back

=item $query->cancel

Cancels a request that is in progress.

=item EV::ADNS::reinit undef, $resolvdata_or_undef

Cancels all outstanding queries, frees all adns state and reinitialises
it. It is highly recommended to only call this when there are no
outstanding requests.

The first argument must currently be specified as C<undef>.

The second argument can be missing or C<undef>; in which case the normal
initialisation is done (such as reading the F<resolv.conf>), or it might
be a stirng, in which case no config files or environment variables will
be read and the given string will be interpreted as the F<resolv.conf>
contents.

=back

=cut

package EV::ADNS;

use Carp ();
use EV ();

BEGIN {
   $VERSION = '3.0';

   require XSLoader;
   XSLoader::load (EV::ADNS, $VERSION);
}

=head1 SEE ALSO

L<EV>, L<Net::ADNS> another interface to adns, maybe better, but without
real support to integrate it into other event loops.

=head1 AUTHOR

 Marc Lehmann <schmorp@schmorp.de>
 http://home.schmorp.de/

=cut

1

Revision:	1.15
Committed:	Fri Oct 16 23:58:20 2015 UTC (8 years, 8 months ago) by root
Branch:	MAIN
Changes since 1.14:	+10 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	=head1 NAME
2
3	root	1.5	EV::ADNS - lightweight asynchronous dns queries using EV and libadns
4	root	1.1
5			=head1 SYNOPSIS
6
7	root	1.3	use EV;
8	root	1.1	use EV::ADNS;
9
10	root	1.14	EV::ADNS::submit "example.com", EV::ADNS::r_addr, EV::ADNS::qf_cname_loose, sub {
11	root	1.2	my ($status, $expires, @a) = @_;
12			warn $a[0]; # "127.13.166.3" etc.
13			};
14
15	root	1.14	EV::run;
16	root	1.3
17	root	1.1	=head1 DESCRIPTION
18
19	root	1.2	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	root	1.14	namespace, without the C<adns_> prefix, i.e. C<adns_r_a> becomes
32			C<EV::ADNS::r_a> and so on.
33	root	1.2
34			=head1 FUNCTIONS
35
36			=over 4
37
38			=item $query = EV::ADNS::submit "domain", $rrtype, $flags, $cb
39
40			Submits a new request to be handled. See the C<adns_submit> C function
41			description for more details. The function optionally returns a query
42			object which can be used to cancel an in-progress request. You do not need
43	root	1.14	to store the query object, even if you ignore it, the query will proceed.
44	root	1.2
45			The callback will be invoked with a result status, the time the resource
46			record validity expires and zero or more resource records, one scalar per
47			result record. Example:
48
49			sub adns_cb {
50			my ($status, $expires, @rr) = @_;
51			if ($status == EV::ADNS::s_ok) {
52			use JSON::XS;
53	root	1.7	warn encode_json \@rr;
54	root	1.2	}
55			}
56
57			The format of result records varies considerably, here is some cursory
58			documentation of how each record will look like, depending on the query
59			type:
60
61			=over 4
62
63	root	1.15	=item EV::ADNS::r_addr
64	root	1.2
65	root	1.15	IPv4 and/or IPV6 addresses in string form.
66
67			=item EV::ADNS::r_a
68
69			IPv4 addresses in dotted quad (string) form.
70
71			=item EV::ADNS::r_aaaa
72
73			IPv6 addresses in string form.
74	root	1.2
75	root	1.5	=item EV::ADNS::r_ns_raw, EV::ADNS::r_cname, EV::ADNS::r_ptr, EV::ADNS::r_ptr_raw
76	root	1.2
77			The resource record as a simple string.
78
79	root	1.5	=item EV::ADNS::r_txt
80	root	1.2
81			An arrayref of strings.
82
83	root	1.5	=item EV::ADNS::r_ns
84	root	1.2
85			A "host address", a hostname with any number of addresses (hint records).
86
87	root	1.14	The record will be an arrayref with domainname, adns status and any number
88			of associated addresses: C<< ["domain", adns_status, addr...] >>.
89	root	1.2
90	root	1.5	=item EV::ADNS::r_hinfo
91	root	1.2
92			An arrayref consisting of the two strings.
93
94	root	1.5	=item EV::ADNS::r_rp, EV::ADNS::r_rp_raw
95	root	1.2
96			An arrayref with two strings.
97
98	root	1.5	=item EV::ADNS::r_mx
99	root	1.2
100			An arrayref consisting of the priority and a "host address" (see
101	root	1.5	C<EV::ADNS::r_ns>). Example:
102	root	1.2
103	root	1.14	[10, [["alt3.aspmx.l.google.com", 0, "64.233.189.27", "2404:6800:4008:c07::1a"]]]
104	root	1.2
105	root	1.5	=item EV::ADNS::r_mx_raw
106	root	1.2
107			An arrayref consisting of the priority and the hostname, e.g. C<[10,
108			"mail.example.com"]>.
109
110	root	1.5	=item EV::ADNS::r_soa, EV::ADNS::r_soa_raw
111	root	1.2
112			An arrayref consisting of the primary nameserver, admin name, serial,
113			refresh, retry expire and minimum times, e.g.:
114
115	root	1.5	["ns.example.net", "hostmaster@example.net", 2000001102, 86400, 21600, 2592000, 172800]
116	root	1.2
117			The "raw" form doesn't mangle the e-mail address.
118
119	root	1.5	=item EV::ADNS::r_srv_raw
120	root	1.2
121			An arrayref consisting of the priority, weight, port and hostname, e.g.:
122
123	root	1.5	[10, 10, 5060, "sip1.example.net"]
124	root	1.2
125	root	1.5	=item EV::ADNS::r_srv
126	root	1.2
127	root	1.5	The same as C<EV::ADNS::r_srv_raw>, but the hostname is replaced by a "host
128			address" (see C<EV::ADNS::r_ns>).
129	root	1.2
130	root	1.5	=item EV::ADNS::r_unknown
131	root	1.2
132			A single octet string with the raw contents.
133
134			=item anything else
135
136			Currently C<undef>.
137
138			=back
139
140			=item $query->cancel
141
142			Cancels a request that is in progress.
143
144	root	1.14	=item EV::ADNS::reinit undef, $resolvdata_or_undef
145
146			Cancels all outstanding queries, frees all adns state and reinitialises
147			it. It is highly recommended to only call this when there are no
148			outstanding requests.
149
150			The first argument must currently be specified as C<undef>.
151
152			The second argument can be missing or C<undef>; in which case the normal
153			initialisation is done (such as reading the F<resolv.conf>), or it might
154			be a stirng, in which case no config files or environment variables will
155			be read and the given string will be interpreted as the F<resolv.conf>
156			contents.
157
158	root	1.2	=back
159
160	root	1.1	=cut
161
162			package EV::ADNS;
163
164			use Carp ();
165			use EV ();
166
167			BEGIN {
168	root	1.14	$VERSION = '3.0';
169	root	1.1
170			require XSLoader;
171			XSLoader::load (EV::ADNS, $VERSION);
172			}
173
174			=head1 SEE ALSO
175
176	root	1.2	L<EV>, L<Net::ADNS> another interface to adns, maybe better, but without
177			real support to integrate it into other event loops.
178	root	1.1
179			=head1 AUTHOR
180
181			Marc Lehmann <schmorp@schmorp.de>
182			http://home.schmorp.de/
183
184			=cut
185
186			1
187