There are a few bugs in dnrd that should probably be fixed by the author
but could be made to work on bsd:

1.  Initialization in common.h of recv_addr is broken, causing at least the
'-a' switch not to work.  Instead of assuming positions of fields in the
struct across platforms I thought it safer to do a standard initialization
in main().

2.  The buffer overflow code in udp.c:dnsrecv() is off by one, rejecting
messages where the size exactly fills the available buffer.  I also changed
to the calls to dnsrecv to pass 512 as the max size instead of the buffers
that seem to be padded by 4 bytes for a reason I don't understand.  This
causes a calling named to resend packets.  Eventually one seems to get
through but response times can be painfully slow.