DW:

DW:
 - A fix for problems relating to large DNS replies.  RFC 1035 says
   that DNS/UDP messages must be 512 octets or less.  Some servers
   (BIND on OS/2) are sending larger packets, but Squid was only
   reading the first 512 octets.  This could cause buffer overruns
   in rfc1035.c.

   This patch changes recv() to use the maximum UDP socket buffer
   size.  However, if we get a large reply we tell rfc1035.c that
   we only got 512 octets.  Thus, its a little safer if that code
   has bugs and reads past 512.