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|
package dnsserver
import (
"strings"
"github.com/coredns/coredns/middleware"
"github.com/miekg/dns"
)
type zoneAddr struct {
Zone string
Port string
Transport string // dns, tls or grpc
}
// String return the string representation of z.
func (z zoneAddr) String() string { return z.Transport + "://" + z.Zone + ":" + z.Port }
// Transport returns the protocol of the string s
func Transport(s string) string {
switch {
case strings.HasPrefix(s, TransportTLS+"://"):
return TransportTLS
case strings.HasPrefix(s, TransportDNS+"://"):
return TransportDNS
case strings.HasPrefix(s, TransportGRPC+"://"):
return TransportGRPC
}
return TransportDNS
}
// normalizeZone parses an zone string into a structured format with separate
// host, and port portions, as well as the original input string.
func normalizeZone(str string) (zoneAddr, error) {
var err error
// Default to DNS if there isn't a transport protocol prefix.
trans := TransportDNS
switch {
case strings.HasPrefix(str, TransportTLS+"://"):
trans = TransportTLS
str = str[len(TransportTLS+"://"):]
case strings.HasPrefix(str, TransportDNS+"://"):
trans = TransportDNS
str = str[len(TransportDNS+"://"):]
case strings.HasPrefix(str, TransportGRPC+"://"):
trans = TransportGRPC
str = str[len(TransportGRPC+"://"):]
}
host, port, err := middleware.SplitHostPort(str)
if err != nil {
return zoneAddr{}, err
}
if port == "" {
if trans == TransportDNS {
port = Port
}
if trans == TransportTLS {
port = TLSPort
}
if trans == TransportGRPC {
port = GRPCPort
}
}
return zoneAddr{Zone: dns.Fqdn(host), Port: port, Transport: trans}, nil
}
// Supported transports.
const (
TransportDNS = "dns"
TransportTLS = "tls"
TransportGRPC = "grpc"
)
|
