fcd0342e42
* core: allow all CIDR ranges in zone specifications Allow (e.g.) a v4 reverse on a /17. If a zone is specified in such a way a FilterFunc is set in the config. This filter is checked against incoming queries. For all other queries this adds a 'x != nil' check which will not impact performace too much. Benchmark function is added as well to check for this as wel. Add multiple tests in tests/server_reverse_test.go. Benchmark shows in the non-reverse case this hardly impact the speed: ~~~ classless: pkg: github.com/coredns/coredns/core/dnsserver BenchmarkCoreServeDNS-4 1000000 1431 ns/op 16 B/op 1 allocs/op pkg: github.com/coredns/coredns/core/dnsserver BenchmarkCoreServeDNS-4 1000000 1429 ns/op 16 B/op 1 allocs/op master: pkg: github.com/coredns/coredns/core/dnsserver BenchmarkCoreServeDNS-4 1000000 1412 ns/op 16 B/op 1 allocs/op pkg: github.com/coredns/coredns/core/dnsserver BenchmarkCoreServeDNS-4 1000000 1429 ns/op 16 B/op 1 allocs/op ~~~ * README.md updates
65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
package dnsserver
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import (
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"crypto/tls"
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"github.com/coredns/coredns/plugin"
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"github.com/mholt/caddy"
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)
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// Config configuration for a single server.
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type Config struct {
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// The zone of the site.
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Zone string
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// The hostname to bind listener to, defaults to the wildcard address
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ListenHost string
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// The port to listen on.
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Port string
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// Root points to a base directory we we find user defined "things".
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// First consumer is the file plugin to looks for zone files in this place.
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Root string
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// Debug controls the panic/recover mechanism that is enabled by default.
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Debug bool
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// The transport we implement, normally just "dns" over TCP/UDP, but could be
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// DNS-over-TLS or DNS-over-gRPC.
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Transport string
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// If this function is not nil it will be used to further filter access
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// to this handler. The primary use is to limit access to a reverse zone
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// on a non-octet boundary, i.e. /17
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FilterFunc func(string) bool
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// TLSConfig when listening for encrypted connections (gRPC, DNS-over-TLS).
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TLSConfig *tls.Config
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// Plugin stack.
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Plugin []plugin.Plugin
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// Compiled plugin stack.
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pluginChain plugin.Handler
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// Plugin interested in announcing that they exist, so other plugin can call methods
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// on them should register themselves here. The name should be the name as return by the
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// Handler's Name method.
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registry map[string]plugin.Handler
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}
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// GetConfig gets the Config that corresponds to c.
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// If none exist nil is returned.
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func GetConfig(c *caddy.Controller) *Config {
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ctx := c.Context().(*dnsContext)
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if cfg, ok := ctx.keysToConfigs[c.Key]; ok {
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return cfg
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}
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// we should only get here during tests because directive
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// actions typically skip the server blocks where we make
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// the configs.
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ctx.saveConfig(c.Key, &Config{})
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return GetConfig(c)
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}
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