bfaf9e0aec
* 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
74 lines
1.5 KiB
Go
74 lines
1.5 KiB
Go
// Package erratic implements a middleware that returns erratic answers (delayed, dropped).
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package erratic
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import (
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"sync/atomic"
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"github.com/coredns/coredns/request"
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"github.com/miekg/dns"
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"golang.org/x/net/context"
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)
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// Erratic is a middleware that returns erratic repsonses to each client.
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type Erratic struct {
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amount uint64
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q uint64 // counter of queries
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}
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// ServeDNS implements the middleware.Handler interface.
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func (e *Erratic) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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state := request.Request{W: w, Req: r}
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drop := false
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if e.amount > 0 {
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queryNr := atomic.LoadUint64(&e.q)
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if queryNr%e.amount == 0 {
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drop = true
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}
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atomic.AddUint64(&e.q, 1)
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}
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m := new(dns.Msg)
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m.SetReply(r)
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m.Compress = true
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m.Authoritative = true
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// small dance to copy rrA or rrAAAA into a non-pointer var that allows us to overwrite the ownername
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// in a non-racy way.
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switch state.QType() {
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case dns.TypeA:
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rr := *(rrA.(*dns.A))
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rr.Header().Name = state.QName()
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m.Answer = append(m.Answer, &rr)
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case dns.TypeAAAA:
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rr := *(rrAAAA.(*dns.AAAA))
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rr.Header().Name = state.QName()
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m.Answer = append(m.Answer, &rr)
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default:
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if !drop {
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// coredns will return error.
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return dns.RcodeServerFailure, nil
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}
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}
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if drop {
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return 0, nil
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}
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state.SizeAndDo(m)
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w.WriteMsg(m)
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return 0, nil
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}
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// Name implements the Handler interface.
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func (e *Erratic) Name() string { return "erratic" }
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var (
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rrA, _ = dns.NewRR(". IN 0 A 192.0.2.53")
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rrAAAA, _ = dns.NewRR(". IN 0 AAAA 2001:DB8::53")
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)
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