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core: add more transports (#574)

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* core: add listening for other protocols

Allow CoreDNS to listen for TLS request coming over port 853. This can
be enabled with `tls://` in the config file.

Implement listening for grps:// as well.

a Corefile like:

~~~
. tls://.:1853 {
    whoami
    tls
}
~~~

Means we listen on 1853 for tls requests, the `tls` config item allows
configuration for TLS parameters. We *might* be tempted to use Caddy's
Let's Encrypt implementation here.

* Refactor coredns/grpc into CoreDNS

This makes gRPC a first class citizen in CoreDNS. Add defines as being
just another server.

* some cleanups

* unexport the servers

* Move protobuf dir

* Hook up TLS properly

* Fix test

* listen for TLS as well. README updates

* disable test, fix package

* fix test

* Fix tests

* Fix remaining test

* Some tests

* Make the test work

* Add grpc test from #580

* fix crash

* Fix tests

* Close conn

* README cleanups

* README

* link RFC
This commit is contained in:
Miek Gieben
2017-03-13 20:24:37 +00:00
committed by GitHub
parent 4985d698e2
commit bfaf9e0aec
24 changed files with 570 additions and 50 deletions
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27
middleware/normalize.go
View File

@@ -7,6 +7,8 @@ import (
"github.com/miekg/dns"
)
// See core/dnsserver/address.go - we should unify these two impls.
// Zones respresents a lists of zone names.
type Zones []string
@@ -56,12 +58,24 @@ type (
)
// Normalize will return the host portion of host, stripping
// of any port. The host will also be fully qualified and lowercased.
// of any port or transport. The host will also be fully qualified and lowercased.
func (h Host) Normalize() string {
s := string(h)
switch {
case strings.HasPrefix(s, TransportTLS+"://"):
s = s[len(TransportTLS+"://"):]
case strings.HasPrefix(s, TransportDNS+"://"):
s = s[len(TransportDNS+"://"):]
case strings.HasPrefix(s, TransportGRPC+"://"):
s = s[len(TransportGRPC+"://"):]
}
// separate host and port
host, _, err := net.SplitHostPort(string(h))
host, _, err := net.SplitHostPort(s)
if err != nil {
host, _, _ = net.SplitHostPort(string(h) + ":")
host, _, _ = net.SplitHostPort(s + ":")
}
return Name(host).Normalize()
}
@@ -77,3 +91,10 @@ func (a Addr) Normalize() string {
// TODO(miek): lowercase it?
return net.JoinHostPort(addr, port)
}
// Duplicated from core/dnsserver/address.go !
const (
TransportDNS = "dns"
TransportTLS = "tls"
TransportGRPC = "grpc"
)