tree 3e7510ff856dc3f549aa884b737b410576503e27
parent 6078986fec03a1dcc236c34816c71b0e05018fda
author Mikio Hara <mikioh.mikioh@gmail.com> 1501013324 +0900
committer Mikio Hara <mikioh.mikioh@gmail.com> 1522446864 +0000

dns/dnsmessage: add basic support for EDNS(0)

This change introduces OPTResourse type to support DNS messages
containing various extension options as defined in RFC 6891.
Parsing and building OPT pseudo records requires allocations like TXT
records.

Also adds DNSSECAllowed, ExtendedRCode and SetEDNS0 methods to
ResourceHeader for convenience.

Updates golang/go#6464.
Updates golang/go#16218.

Change-Id: Ib72cea277201e4122c6b5effa320084ff351c886
Reviewed-on: https://go-review.googlesource.com/47170
Reviewed-by: Ian Gudger <igudger@google.com>