mirror of
https://github.com/coredns/coredns.git
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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
90 lines
2.1 KiB
Go
90 lines
2.1 KiB
Go
package dnsserver
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import (
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"fmt"
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"net"
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"strings"
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"github.com/miekg/dns"
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)
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type zoneAddr struct {
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Zone string
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Port string
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Transport string // dns, tls or grpc
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}
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// String return the string represenation of z.
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func (z zoneAddr) String() string { return z.Transport + "://" + z.Zone + ":" + z.Port }
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// Transport returns the protocol of the string s
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func Transport(s string) string {
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switch {
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case strings.HasPrefix(s, TransportTLS+"://"):
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return TransportTLS
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case strings.HasPrefix(s, TransportDNS+"://"):
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return TransportDNS
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case strings.HasPrefix(s, TransportGRPC+"://"):
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return TransportGRPC
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}
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return TransportDNS
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}
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// normalizeZone parses an zone string into a structured format with separate
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// host, and port portions, as well as the original input string.
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//
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// TODO(miek): possibly move this to middleware/normalize.go
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func normalizeZone(str string) (zoneAddr, error) {
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var err error
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// Default to DNS if there isn't a transport protocol prefix.
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trans := TransportDNS
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switch {
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case strings.HasPrefix(str, TransportTLS+"://"):
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trans = TransportTLS
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str = str[len(TransportTLS+"://"):]
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case strings.HasPrefix(str, TransportDNS+"://"):
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trans = TransportDNS
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str = str[len(TransportDNS+"://"):]
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case strings.HasPrefix(str, TransportGRPC+"://"):
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trans = TransportGRPC
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str = str[len(TransportGRPC+"://"):]
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}
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host, port, err := net.SplitHostPort(str)
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if err != nil {
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host, port, err = net.SplitHostPort(str + ":")
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// no error check here; return err at end of function
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}
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if len(host) > 255 { // TODO(miek): this should take escaping into account.
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return zoneAddr{}, fmt.Errorf("specified zone is too long: %d > 255", len(host))
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}
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_, d := dns.IsDomainName(host)
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if !d {
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return zoneAddr{}, fmt.Errorf("zone is not a valid domain name: %s", host)
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}
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if port == "" {
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if trans == TransportDNS {
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port = Port
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}
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if trans == TransportTLS {
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port = TLSPort
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}
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if trans == TransportGRPC {
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port = GRPCPort
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}
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}
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return zoneAddr{Zone: strings.ToLower(dns.Fqdn(host)), Port: port, Transport: trans}, err
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}
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// Supported transports.
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const (
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TransportDNS = "dns"
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TransportTLS = "tls"
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TransportGRPC = "grpc"
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)
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