cvs commit: src/lib/libc/net getaddrinfo.c

Hiroki Sato hrs at
Wed Feb 2 07:11:29 PST 2005

hrs         2005/02/02 07:10:55 PST

DragonFly src repository

  Modified files:
    lib/libc/net         getaddrinfo.c 
  Query A records before AAAA records in getaddrinfo() when AF_UNSPEC
  is specified.  Some broken DNS servers return NXDOMAIN against
  non-existent AAAA queries, even when it should return NOERROR
  with empty return records.  This is a problem for an IPv4/IPv6 dual
  stack node since the NXDOMAIN returned by the first query of
  an AAAA record makes it give up querying the A record.  Also, this
  behavior has been recognized as a potential denial-of-service attack.
  Note that although the query order has been changed, the result
  linked-list of (struct addrinfo) set by getaddrinfo() is still
  in order of AF_INET6 -> AF_INET.
  Revision  Changes    Path
  1.5       +11 -10    src/lib/libc/net/getaddrinfo.c

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