Ignore most of the source code - this should lead to smaller docker
images.

Due to the one-off nature of releases 1.0.4 we need to manually bump
the version in master.

Resolves: #1313

* plugin/dnssec: filter bitmap also for NXDOMAIN responses

We change nxdomain to nodata, so at the point when we receive the
reply it can be nxdomain or nodata. In both cases we should filter the
nsec bitmap.

Change the code and add explicit tests for this.

* More tests

* plugin/health: add lameduck mode

Add a way to configure lameduck more, i.e. set health to false, stop
polling plugins. Then wait for a duration before shutting down. As the
health middleware is configured early on in the plugin list, it will
hold up all other shutdown, meaning we still answer queries.

* Add New

* More tests

* golint

* remove confusing text

* plugin/dnssec: check validityperiod of RRSIGs

Somehow we missed implementing this. If a sig a retrieved from the
cache, but not valid anymore, regenerate it instead of server invalid
signatures.

Fixes #1378

* drop from cache after 3/4 validity

* six days means 6 days

* Improve plugin/cache metrics

* Add coredns_cache_prefetch_total metric to track number of prefetches.
* Remove unnecessary Cache.get() call which would incorrectly increment
  cache counters.
* Initialize all counters and gauges at zero.

* Allow prefetching of a single request per ttl

The original implementation didn't allow prefetching queries which are
only requested once during the duration of a TTL. The minimum amount of
queries which had to be seen was therefore capped at 2.

This change also implements a real prefetch test. The existing test was
a noop and always passed regardless of any prefetch implementation.

* Fix prefetching for items with a short TTL

The default prefetch threshold (percentage) is 10% of the lifetime of a
cache item. With the previous implementation, this disabled prefetching
for all items with a TTL < 10s (the resulting percentage would be 0, at
which point a cached item is already discarded).

This change uses a time based threshold calculation and ensures that
a prefetch is triggered at a TTL of 1 at the latest.

* Fix wrong duration reporting of cached responses

The logging and metrics plugins (among others) included the duration of
a cache prefetch in the request latency of client request. This change
fixes this wrong reporting and executes the prefetch request in a
goroutine in the background.

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

This fix is an enhancement of external plugin enabling.
Previously, it was already able to build a customerized
coredns with plugins enabled selectively, without changing
coredns source code. However, all default plugins are
actually bundled because of the import rule:
```
"github.com/coredns/coredns/coremain"
```

The issue is best described with the following:
```
root@localhost:/go/src/github.com/coredns/coredns/sample# cat sample.go
package main

import (
        _ "github.com/coredns/forward"

        "github.com/coredns/coredns/coremain"
        "github.com/coredns/coredns/core/dnsserver"
)

var directives = []string{
        "forward",
        "startup",
        "shutdown",
}

func init() {
        dnsserver.Directives = directives
}

func main() {
        coremain.Run()
}
root@localhost:/go/src/github.com/coredns/coredns/sample#
root@localhost:/go/src/github.com/coredns/coredns/sample# go build -v sample.go
root@localhost:/go/src/github.com/coredns/coredns/sample# ./sample -plugins
root@localhost:/go/src/github.com/coredns/coredns/sample# ./sample -plugins
Server types:
  dns

Caddyfile loaders:
  flag
  default

Other plugins:
  dns.auto
  dns.autopath
  dns.bind
  dns.cache
  dns.chaos
  dns.debug
  dns.dnssec
  dns.dnstap
  dns.erratic
  dns.errors
  dns.etcd
  dns.federation
  dns.file
  dns.forward
  dns.health
  dns.hosts
  dns.kubernetes
  dns.loadbalance
  dns.log
  dns.nsid
  dns.pprof
  dns.prometheus
  dns.proxy
  dns.reverse
  dns.rewrite
  dns.root
  dns.route53
  dns.secondary
  dns.template
....
```

This fix moves zplugins.go to a different package/directory so that
it is possible to "only import plugins as needed".

The following is the new output after this fix:
```
root@localhost:/go/src/github.com/coredns/coredns/sample# ./sample -plugins
Server types:
  dns

Caddyfile loaders:
  flag
  default

Other plugins:
  dns.forward
  dns.prometheus
  shutdown
  startup

root@localhost:/go/src/github.com/coredns/coredns/sample#
```
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

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

* Add route53 plugin

This fix adds route53 plugin so that it is possible to
query route53 record through CoreDNS.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

SOA records are returned in the authority section, not as answer.

The original ServergRPC.Listen() method returns a tls.Listener
when tls protocol is specified. Unfortunate, tls.Listener
does not implement the caddy.Listener interface that is
needed for graceful restart to work.

The change is to have the ServergRPC.Listen() method returns the
inner net.Listener instead. The creation of the tls.Listener
is deferred to the ServergRPC.Serve() method.

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

Minor textual cleanup.

The cache plugin always returned a minimum TTL of 5 seconds, regardless
of the actual TTL of the records. A cache is not authoritative for the
record TTL and should not extend it.

Minor textual cleanup.

More minor textual fixes.

Fixing a couple of small textual problems.

Just some textual cleanup:  A few misspellings and a few clarifications.

The changes in this fix have:
1. checkout master branch of dependencies (non-branch will trigger an error with go get -u)
2. go get -u
3. checkout specific versioon (not necessary a branch).
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

This fix fixes version fetched from `go get` so
that versions are guarded.

github.com/mholt/caddy              v0.10.10
github.com/miekg/dns                v1.0.3
github.com/prometheus/client_golang v0.8.0
golang.org/x/net                    release-branch.go1.9 (branch)
golang.org/x/text                   e19ae1496984b1c655b8044a65c0300a3c878dd3

This fix fixes 1368.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Constent atx headers

* Regen manual pages

* plugin/health: add 'overloaded metrics'

Query our on health endpoint and record (and export as a metric) the
time it takes. The Get has a 5s timeout, that, when reached, will set
the metric duration to 5s. The actually call "I'm I overloaded" is left
to an external entity.

* README

* golint and govet

* and the tests

These can be just vars. Think that was intended as well.

Small README updates, and fallthrough fixes (using less code)

* Align plugin/template usage and syntax with other plugins

* Use new fallthrough logic in plugin/template

* Use zone name normalization for plugin/template

* Test fallthrough parsing in plugin/template

* Rework scoping of match checks

Most matches are not plugin global but per template. The plugin does only a
very rough check while detailed checks are done per-template.

Per template checks include:
- Zones
- Class/Type
- Regex
- Fallthrough

* Remove trailing `.` from fully qualified domain names

* Register template metrics with zone/class/type instead of regex

* Remove trailing fqdn dot from multiple testcases

* plugin/proxy: max the number of upstreams

Put a max of 15 on the number of upstreams.

* plugin/template: README tweaks

* Go gen it

* Add a template plugin

The template plugin matches the incoming query by class, type and regex
and templates a response with go templates.

* Fix go style errors

* Fix template README example

* Fix corefile example in plugin/template

* Clarify plugin/template/README.md

Add more details and external links where needed.

* Fix code issues in plugin/template

* Add template metrics

* Add section and template to template plugin metrics

* Fix style / remove extra newline on go imports

* Fix typo in plugin/template/README.md

* Update README.md

I've change the format a bit in a PR that I merged yesterday.

* Add authority section to plugin/template

* Fix naming of incoming query name in plugin/template/README.md

* Fix doc syntax in plugin/template/README.md

* Add authority section to plugin/template/README.md config overview

* Add metric labels to plugin/template/README.md metrics section

* Use request.Request to pass state to the template matcher

* Simplify plugin/pkg/fall

* Remove unused import

* Fix fall_test

* Get fall coverage to 100% just because

* gofmt. sigh.

* Add pkg/fall for Fallthrough

Move this into it's own package to facilitate tests. Important bug
was fixed: make the names fully qualified.

Add fall package to hosts, reverse, etcd, and fix kubernetes and any
tests. The k8s tests are still as-is, might need a future cleanup.

* Add zone filtering to fallthrough

* Doh. gofmt

* Update documentation

Fixes #1331