nsd users - Jan 2006 - message ``sendto failed: Invalid argument''

Not sure whether this is a bug report or an RFE, so I'll give it a try here.
In my NSD 2.3.3's logs there are quite a couple of entries like

[1138286782] nsd[42]: error: sendto failed: Invalid argument

They originate from server.c and the reason usually is an attempt to send
a response to UDP port 0. Source port 0 is legal but it means something
like "I do not care what the response is", so it doesn't make much
sense
for DNS queries. I could filter those packets, of course.
Then, the log message is not too instructive due to lack of detail.
It could be something else but a dst port 0 sendto() attempt and if
a particular querier appears too often it might be intersting as well.
So, nsd could (silently) ignore DNS packets with src port 0 or log the
error with more detail or both. Opinions?

-Peter

[On 26 Jan, @18:32, Peter Koch wrote in "message ``sendto failed: Inval
..."]
> So, nsd could (silently) ignore DNS packets with src port 0 or log the
> error with more detail or both. Opinions?
 
Hmm... the current behavoir of NSD should be changed IMO. The danger
is that if we log such queries we create a small DOS attack (which is
also present now). So I would like to silently ignore such queries,
maybe only log them when NSD is compiled with --enable-checking.

regards,

--
grtz,
  - Miek

  http://www.miek.nl              http://www.nlnetlabs.nl
  PGP: 6A3C F450 6D4E 7C6B C23C  F982 258B 85CF 3880 D0F6
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