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, EV::ADNS::qf_cname_loose, sub { my ($status, $expires, @a) = @_; warn $a[0]; # "127.13.166.3" etc. }; EV::run; 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, i.e. "adns_r_a" becomes "EV::ADNS::r_a" 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). The record will be an arrayref with domainname, adns status and any number of associated addresses: "["domain", adns_status, addr...]". 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, [["alt3.aspmx.l.google.com", 0, "64.233.189.27", "2404:6800:4008:c07::1a"]]] 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. 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 "undef". The second argument can be missing or "undef"; in which case the normal initialisation is done (such as reading the 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 resolv.conf contents. 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/