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_addr, 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 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: EV::ADNS::r_a, EV::ADNS::r_addr 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/