* experimental dnstap support into proxy

* proxy reports dnstap errors

* refactoring

* add a message builder for less dnstap code

* msg lint

* context

* proxy by DNS: dnstap comments

* TapBuilder

* resolves conflict

* dnstap into ServeDNS

* testing

* more tests

* `go lint`

* doc update

* mw/kubernetes: move fallthrough tests out

Remove the testcase duplication and put fallthrough tests in separate
file.

Also make some names shorter and more descriptive.

* fix test build

* fix corefile

fail startup when dnssec middleware has keys configured that can't be
used to sign any of the responses it should sign.

More tests added, including ones that actually trigger setup failures.

Check for a nil message and if we have a question section. Request is
usually called with an external Msg that already saw validation checks,
but we may also call it from message we create of our own, that may or
may not adhire to this. Just be more robust in this case.

This PR reverts a previous commit that was applied to master.

Check if msg is nil in DefaultErrorFunc. If this is the case log this
and short cut the function.

Hoping to get more insight in #925

* mw/kubernetes: split integration tests

* separate file and test for api fallthrough, does not need all other
  servers to be started.
* more split ups: make it clear when or when not we need an upstream server,
  as just needlessly start it in doIntegrationTests.
* use identifiers from dns package -> "TypeSRV" -> dns.TypeSRV, as there
  is no need to reinvent these.

* updates

* deploy work-around

* re-add weird sleep

Reloading caddy won't kill the health handler. Only on final shutdown
we stop the handler.

Currently when reloading CoreDNS with -SIGUSR1 the health handler stops
answering - there is a test for this but it doesn't capture whole
process reloading, sadly. This PR keeps the handler alive during reloads
and only stops on process shutdown.

* dep ensure -update

Run "dep ensure -update` to update all dependencies.

No code changes; just the dependencies.

* dep prune

* add new venderod

This add the infrastructure to let other middleware report their health
status back to the health middleware. A health.Healther interface is
introduced and a middleware needs to implement that. A middleware
that supports healthchecks is statically configured.

Every second each supported middleware is queried and the global health
state is updated.

Actual tests have been disabled as no other middleware implements this
at the moment.

Go vet warning: fix use of context.

Fixes #997

Also make *auto*'s reload test less flaky by retrying
and then giving up.

To align with #992
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* mw/kubernetes: add configurable TTL

Add ttl option to kubernetes. This defaults to 5s but allows
configuration to go up to 3600.

Configure the tests so that a few actually check for the 5s, while the
rest use the TTL of 303 which is ignored by the checking code.

Fixes #935

* fix tests

* and more

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

Start CoreDNS instance in call Restart() on it.

changes in Caddy caused mw/root tests to fail: https://github.com/mholt/caddy/commit/4cce8c7b6bf08ffff5e30999aa49259324d58f5d (#990)

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

block chaos queries, unless the chaos or proxy middleware is loaded. We
respond with REFUSED.

This removes the need for each middleware to do this class != ClassINET
if-then.

Also make config.Registry non-public.

* Remove createTestServer

* more cleanups

* comment tweak

* sort

* sigh

Split up the handler_test in four files that all tests their specific
bits. Removed the CNAME sort as there was only 1 answer with a CNAME
and that was a single one.

See #942, this fixes (a bit) the tests in middleware.

* Add set EDNS0 with variable substitution

* Change variable from $ to {}. Un-export constants

* Update README

* Change getRuleData() to ruleData(); Change to use string match from regexp

* tests: CoreDNSServerAndPorts

Copy from kubernetes.go and renamed to fit the style, adapted almost
all callers.

This is a mechanicl change, no testdata was changed.

* typos

Increate the sleep duration; this is not a proper fix. The problem here
is that this is in test that just starts a CoreDNS instance and thus we
don't have levers to make "time speed up". It might be worth checking if
there is some LD_PRELOAD hackery that fakes time for the entire test?

Fixes #945 (not really, but closing with this)

* Small golint cleanup

Mostly docs in autopath.

* duh

Do the return early and dedent the rest of the function.

* mw/kubernetes: add apex test

This adds small test case for apex queries: SOA and HINFO.

Fix (obvious) parse bug in parse.go.

* Test Ns request also here

Based up on: #939, but redone in a new PR with some cherry-picked
commits:
aacb91ef0b927683b21d6ee39dbddbd001334854
5dc34247b7d0136d9fe035f6b10d6b3e14ee7f2c

This removes kPod and Kservice and creates []msg.Service from k.findPods
and k.findServices.

Updated few tests which I *think* are correct; they look correct to me.

* mw/kubernetes: don't export Pod-mode constants.

* merged

* mw/kubernetes: resync to opts

Only used to initialize the cache that already has a dnsControlopts, so
remove it from the main kubernetes struct.

* Fix test

* mw/kubernetes: LabelSelector to options as well

Labels select is also only used for init. Don't carry it in the main
kubernetes struct.

* remove this test: can't happen

Caddyfile parser will only call setup when it sees kubernetes.

* erge gone wrong

* mw/kubernetes: rewrite parseRequest

Stop looking at the qtype in parseRequest and make k.Namespace a map.
Fallout from this is that pkg/strings as it is not used anymore. Also
add a few helper functions to make unexposed namespaces easier to see in
the code.

Add wildcard tests to the middleware tests.

* Fix tests

Add a whole bunch of comments to document what we are trying to do.

* This is now answered

* up coverage

* duh

* Update testcase

* Make it nodata

Upstream allows file structured like /etc/resolv.conf. Update docs.

Fixes #709

Fixes #965

* core: hide registerHandler

Remove RegisterHandler and just make it implicit when we look at the
handler compilation step.

* Rename GetHandler to just Handler

Update callers and make auto check Hander in OnStartup.

* Up test coverage in erratic

* up test coverage

Briefly highlight that autopath might return the wrong results to pods
in different namespaces.

Fixes #778

$INCLUDE was fixed in miekg/dns, create tests in CoreDNS so that we know
we have the latest version.

Fixes #880

Yes, the previous Go version is important but this doubles the wait on
travis. This drops 1.7 from travis. This means we wait for bug reports
to show up, or tell people to use the precompiled binaries are docker
containers.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

It looks like the cached path
- `$GOPATH/src`
- `$GOPATH/pkg`
overlaps with the source path of
`$GOPATH/src/github.com/coredns/coredns`.

Disable the cache for now.

May enable cache in the future if we could exclude
`$GOPATH/src/github.com/coredns/coredns` from `$GOPATH/src`.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>