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CIDR query routing (#1159)

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* 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
This commit is contained in:
Miek Gieben
2017-10-24 10:16:03 +01:00
committed by GitHub
parent 5f813bcc21
commit fcd0342e42
15 changed files with 269 additions and 120 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
core/dnsserver/address.go
View File

@@ -1,6 +1,7 @@
package dnsserver
import (
"net"
"strings"
"github.com/coredns/coredns/plugin"
@@ -11,7 +12,8 @@ import (
type zoneAddr struct {
Zone string
Port string
Transport string // dns, tls or grpc
Transport string // dns, tls or grpc
IPNet *net.IPNet // if reverse zone this hold the IPNet
}
// String return the string representation of z.
@@ -50,7 +52,7 @@ func normalizeZone(str string) (zoneAddr, error) {
str = str[len(TransportGRPC+"://"):]
}
host, port, err := plugin.SplitHostPort(str)
host, port, ipnet, err := plugin.SplitHostPort(str)
if err != nil {
return zoneAddr{}, err
}
@@ -67,7 +69,7 @@ func normalizeZone(str string) (zoneAddr, error) {
}
}
return zoneAddr{Zone: dns.Fqdn(host), Port: port, Transport: trans}, nil
return zoneAddr{Zone: dns.Fqdn(host), Port: port, Transport: trans, IPNet: ipnet}, nil
}
// Supported transports.