dos with bad srv record

[Domrachev Ivan]

if srv record is bad formed then djabberd crashes. debug logs:
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33 DEBUG DJabberd.Connection.ServerIn             Got a dialback result, orig: first.tester.com, recv: conference.second.tester.com
833 DEBUG DJabberd.DNS                             pkt = Net::DNS::Packet=HASH(0x1190a78)
833 DEBUG DJabberd.DNS                             sock = IO::Socket::INET=GLOB(0x1842668)
833 DEBUG DJabberd.DNS                             DNS socket IO::Socket::INET=GLOB(0x1842668) became readable for 'srv'
833 DEBUG DJabberd.DNS                             DNS socket IO::Socket::INET=GLOB(0x1842668) for 'srv' found stuff, now doing hostname look
up on 192.168.0.216.tester.com
833 DEBUG DJabberd.DNS                             Skipping lookup for '192.168.0.216.tester.com', it is already the IP
833 DEBUG DJabberd.Connection.DialbackVerify       Attempting to connect to '192.168.0.216.tester.com'
Bad arg length for Socket::pack_sockaddr_in, length is 0, should be 4 at /usr/local/lib/perl5/5.8.8/mach/Socket.pm line 373.
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srv record looks like:
_xmpp-server._tcp.conference.first.tester.com 192.168.0.216.tester.com.