mirror of
https://github.com/coredns/coredns.git
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76455c6a0d
* Extend bind to allow multiple addresses. UTs added. Changes the log for server starting, adding address when available * update readme for bind * fixes after review * minor fix on readme * accept multiple BIND directives in blocserver, consolidate the addresses * fixes after review - format logging server address, variable names
97 lines
2.3 KiB
Go
97 lines
2.3 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/coredns/coredns/plugin"
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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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IPNet *net.IPNet // if reverse zone this hold the IPNet
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}
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// String return the string representation 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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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, ipnet, err := plugin.SplitHostPort(str)
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if err != nil {
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return zoneAddr{}, err
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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: dns.Fqdn(host), Port: port, Transport: trans, IPNet: ipnet}, nil
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}
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// SplitProtocolHostPort - split a full formed address like "dns://[::1}:53" into parts
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func SplitProtocolHostPort(address string) (protocol string, ip string, port string, err error) {
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parts := strings.Split(address, "://")
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switch len(parts) {
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case 1:
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ip, port, err := net.SplitHostPort(parts[0])
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return "", ip, port, err
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case 2:
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ip, port, err := net.SplitHostPort(parts[1])
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return parts[0], ip, port, err
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default:
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return "", "", "", fmt.Errorf("provided value is not in an address format : %s", address)
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}
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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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