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Default to scrubbing replies in the server (#2012)

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Every plugin needs to deal with EDNS0 and should call Scrub to make a
message fit the client's buffer. Move this functionality into the server
and wrapping the ResponseWriter into a ScrubWriter that handles these
bits for us. Result:

Less code and faster, because multiple chained plugins could all be
calling scrub and SizeAndDo - now there is just one place.

Most tests in file/* and dnssec/* needed adjusting because in those unit
tests you don't see OPT RRs anymore. The DNSSEC signer was also looking
at the returned OPT RR to see if it needed to sign - as those are now
added by the server (and thus later), this needed to change slightly.

Scrub itself still exist (for backward compat reasons), but has been
made a noop. Scrub has been renamed to scrub as it should not be used by
external plugins.

Fixes: #2010

Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben 2018-08-29 12:26:22 +01:00 • committed by GitHub
parent eb51e8bac9
commit ba1efee4f1
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27 changed files with 65 additions and 156 deletions
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5
plugin/file/glue_test.go
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@ -11,8 +11,7 @@ import (
"github.com/miekg/dns"
)
// another personal zone (helps in testing as my secondary is NSD
// atoom = atom in English.
// another personal zone (helps in testing as my secondary is NSD, atoom = atom in English.
var atoomTestCases = []test.Case{
{
Qname: atoom, Qtype: dns.TypeNS, Do: true,
@ -23,7 +22,7 @@ var atoomTestCases = []test.Case{
test.RRSIG("atoom.net. 1800 IN RRSIG NS 8 2 1800 20170112031301 20161213031301 53289 atoom.net. DLe+G1 jlw="),
},
Extra: []dns.RR{
test.OPT(4096, true),
// test.OPT(4096, true), // added by server, not test in this unit test.
test.A("linode.atoom.net. 1800 IN A 176.58.119.54"),
test.AAAA("linode.atoom.net. 1800 IN AAAA 2a01:7e00::f03c:91ff:fe79:234c"),
test.RRSIG("linode.atoom.net. 1800 IN RRSIG A 8 3 1800 20170112031301 20161213031301 53289 atoom.net. Z4Ka4OLDoyxj72CL vkI="),