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package dnsserver
import (
"crypto/tls"
"fmt"
"github.com/coredns/caddy"
"github.com/coredns/coredns/plugin"
)
// Config configuration for a single server.
type Config struct {
// The zone of the site.
Zone string
// one or several hostnames to bind the server to.
// defaults to a single empty string that denote the wildcard address
ListenHosts []string
// The port to listen on.
Port string
// Root points to a base directory we find user defined "things".
// First consumer is the file plugin to looks for zone files in this place.
Root string
// Debug controls the panic/recover mechanism that is enabled by default.
Debug bool
// The transport we implement, normally just "dns" over TCP/UDP, but could be
// DNS-over-TLS or DNS-over-gRPC.
Transport string
// If this function is not nil it will be used to further filter access
// to this handler. The primary use is to limit access to a reverse zone
// on a non-octet boundary, i.e. /17
FilterFunc func(string) bool
// TLSConfig when listening for encrypted connections (gRPC, DNS-over-TLS).
TLSConfig *tls.Config
// Plugin stack.
Plugin []plugin.Plugin
// Compiled plugin stack.
pluginChain plugin.Handler
// Plugin interested in announcing that they exist, so other plugin can call methods
// on them should register themselves here. The name should be the name as return by the
// Handler's Name method.
registry map[string]plugin.Handler
}
// keyForConfig builds a key for identifying the configs during setup time
func keyForConfig(blocIndex int, blocKeyIndex int) string {
return fmt.Sprintf("%d:%d", blocIndex, blocKeyIndex)
}
// GetConfig gets the Config that corresponds to c.
// If none exist nil is returned.
func GetConfig(c *caddy.Controller) *Config {
ctx := c.Context().(*dnsContext)
key := keyForConfig(c.ServerBlockIndex, c.ServerBlockKeyIndex)
if cfg, ok := ctx.keysToConfigs[key]; ok {
return cfg
}
// we should only get here during tests because directive
// actions typically skip the server blocks where we make
// the configs.
ctx.saveConfig(key, &Config{ListenHosts: []string{""}})
return GetConfig(c)
}
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