Define two consts Pod and Svc, makes it stand out a little more
when used in switches in case.

We have opted for a new type, but then you need to convert them
all the time with string(Foo).

* Treat absence of port/service in SRV as wildcard

Normally, a SRV-request should have the form
_<service>._<port>.<name>.<zone>. The k8s peer-finder which is used for
bootstrapping by some applications will however query for SRV at
<name>.<zone>.

To compensate for this behaviour, treat the absence of _<service> and
_<port> as wildcards.

* Modified tests with new SRV behaviour

Added a testcase for a SRV request without port & service
Removed now valid query from invalidSRVQueries

* Forgot to run gofmt on test/kubernetes_test.go

Drop the interfaceAddr interfaces and just use a function. Cleanup
all fallout from that. Remove the use of global variables and cleanup
the tests a bit.

* Added Pod testing

* Cleanup

* fixed formatting

* mw/kubernete: small cleanup

Small cleanup, avoid pointer to []msg.Services and just returns the
msg.Service.

* Actually compile

* testss

SOA would blindly add "." + zone, which when using the root
zone would create a unparseable packet with "name.."

Pull down example middleware and compile it in (this should compile)
then check if dns.example is included in the list of plugins
(middlewares)

Cleanup various READMEs to use the same naming scheme for certs, keys,
and cacerts.

Fixes #762

and skip the download process.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Add Dockerfile for automatic build in DockerHub
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Use build hooks to build docker images with SOURCE_BRANCH
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Stop vendoring go dns and x/net/context

* dep ensure run

* Fix Makefile

* Fix typo

* Delete context vendor dir

Lower-case dnstap in the readme and update Makefile.release to point to
the new website.

Don't hold on to the *first* wildcard you'll find, but keep searching,
there may be one even deeper in the tree.
Also add multi level wildcard test

Fixes #776

middleware/dnstap add

* mw/file: wildcard at apex fix

This adds a test case (that does passes!)

* completer test

* hosts middleware should return NoError if other records exist in the zone

* return RcodeSuccess for hosts queries for non A,AAAA records if the zone exists

* return NXDOMAIN instead of REFUSED when zone is not found

* fix aaaa response

* unit tests

* Add unit tests & cnames

* more progress

* fix

* next mw dependent unit tests

* add tests for OnNXDOMAIN

* Add AAAA and ndots unit tests; fix request.NewWithQuestion

* Correct default value in README

* add CNAMEs to readme

* review

* fix autopath examples

* fix and test CNAME response order

* add wildcard parameter to allow resolving multiple name to the same IP

* first test for the reverse wildcard middleware

* update wildcard keyword test to pass code coverage

* rewrite readme

* remove breaks

* missed a break

* nits

* show options as optional
* add note to pods insecure
* add minimal configuration example.
* add a note about replacing kube-dns in the summary
* move deployment section into summary.

* Update README.md

* replace options sections with bullets

and indent all sub sections to match bullet indentation.
not sure if this will render in github properly - it doesn't in the in-line editor preview.

* fix indentation

Contrary to various on-line guides and editors, github now requires 2 spaces to indent paragraphs with bulleted sections above (not just 1).

* Update README.md

* Update README.md

* Update README.md

* fix label syntax

It's just a single EXPRESSION.  The EXPRESSION itself has its own kubernetes label expression format.

* Update README.md

* Update README.md

* Switches out Unhealthy bool for OkUntil timestamp

* Make sure servers are healthy forever if there are no health checks

* Moves health check off into a go routine to avoid blocking conditions

* Improved logging info

* Fixes initial date

* Fixes health checking; alters tests to adapt to async health checking

* Moves future variable into static upstream and populates it in more places

* Restores silencing of stdout during testing

* Restores silencing of stdout during testing

* keeps check url string once built

* Removes debug message

* uses zero value to signal no checking; reduces in-mutex code to a fetch

* initial commit

* add config options

* add readme

* rewording

* revert unlreated change

* normalize host domain path

* add ndots opt, allow > 1 host domains, pull host domains from resolv.conf

* implementing review feedback

* update readme

* use dns lib, config format, defaults

* Correct autopath example.

This fix disables codecov/patch and codecov/changes status
report as the project has already been well covered by
codecov/project status. The codecov/patch and codecov/changes status
are misleading.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

While adding a parallel performance benchmark I stumbled on a race
condition (another reason to add performance benchmarks!), so this
PR makes sure the msg is created in a race free manor and adds the
parallel benchmark.

* change IPv4 separator from - to .

* fix reverse middleware tests and README to adapt with . instead of -

This fix adjusted codecov config (codecov.yml) so that
commit status is success as long as coverage > 40%.

This fix fixes #752.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>