b56b080a7c
* introduce new interface "dnsserver.Viewer", that allows a plugin implementing it to decide if a query should be routed into its server block. * add new plugin "view", that uses the new interface to enable a user to define expression based conditions that must be met for a query to be routed to its server block. Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
package dnsserver
|
|
|
|
import (
|
|
"fmt"
|
|
"regexp"
|
|
"sort"
|
|
|
|
"github.com/coredns/coredns/plugin/pkg/dnsutil"
|
|
)
|
|
|
|
// checkZoneSyntax() checks whether the given string match 1035 Preferred Syntax or not.
|
|
// The root zone, and all reverse zones always return true even though they technically don't meet 1035 Preferred Syntax
|
|
func checkZoneSyntax(zone string) bool {
|
|
if zone == "." || dnsutil.IsReverse(zone) != 0 {
|
|
return true
|
|
}
|
|
regex1035PreferredSyntax, _ := regexp.MatchString(`^(([A-Za-z]([A-Za-z0-9-]*[A-Za-z0-9])?)\.)+$`, zone)
|
|
return regex1035PreferredSyntax
|
|
}
|
|
|
|
// startUpZones creates the text that we show when starting up:
|
|
// grpc://example.com.:1055
|
|
// example.com.:1053 on 127.0.0.1
|
|
func startUpZones(protocol, addr string, zones map[string][]*Config) string {
|
|
s := ""
|
|
|
|
keys := make([]string, len(zones))
|
|
i := 0
|
|
|
|
for k := range zones {
|
|
keys[i] = k
|
|
i++
|
|
}
|
|
sort.Strings(keys)
|
|
|
|
for _, zone := range keys {
|
|
if !checkZoneSyntax(zone) {
|
|
s += fmt.Sprintf("Warning: Domain %q does not follow RFC1035 preferred syntax\n", zone)
|
|
}
|
|
// split addr into protocol, IP and Port
|
|
_, ip, port, err := SplitProtocolHostPort(addr)
|
|
|
|
if err != nil {
|
|
// this should not happen, but we need to take care of it anyway
|
|
s += fmt.Sprintln(protocol + zone + ":" + addr)
|
|
continue
|
|
}
|
|
if ip == "" {
|
|
s += fmt.Sprintln(protocol + zone + ":" + port)
|
|
continue
|
|
}
|
|
// if the server is listening on a specific address let's make it visible in the log,
|
|
// so one can differentiate between all active listeners
|
|
s += fmt.Sprintln(protocol + zone + ":" + port + " on " + ip)
|
|
}
|
|
return s
|
|
}
|