/
reverse.go
67 lines (57 loc) · 2.04 KB
/
reverse.go
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// Copyright 2019 Yunion
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dns
import (
"strings"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/etcd/msg"
"github.com/coredns/coredns/plugin/pkg/dnsutil"
"github.com/coredns/coredns/request"
"yunion.io/x/onecloud/pkg/compute/models"
)
// Reverse implements the ServiceBackend interface
func (r *SRegionDNS) Reverse(state request.Request, exact bool, opt plugin.Options) (services []msg.Service, err error) {
ip := dnsutil.ExtractAddressFromReverse(state.Name())
if ip == "" {
_, e := r.Records(state, exact)
return nil, e
}
records, err := r.getNameForIp(ip, state)
return records, err
}
func (r *SRegionDNS) getNameForIp(ip string, state request.Request) ([]msg.Service, error) {
req, e := parseRequest(state)
if e != nil {
return nil, e
}
// 1. try local dns records table
records := models.DnsRecordManager.QueryDnsIps(req.ProjectId(), req.Name(), req.Type())
for _, rec := range records {
return []msg.Service{{Host: rec.Addr, TTL: uint32(rec.Ttl)}}, nil
}
// 2. try hosts table
host := models.HostnetworkManager.GetHostByAddress(ip)
if host != nil {
return []msg.Service{{Host: r.joinDomain(host.Name), TTL: defaultTTL}}, nil
}
// 3. try guests table
guest := models.GuestnetworkManager.GetGuestByAddress(ip)
if guest != nil {
return []msg.Service{{Host: r.joinDomain(guest.Name), TTL: defaultTTL}}, nil
}
return nil, errNotFound
}
func (r *SRegionDNS) joinDomain(name string) string {
return strings.Join([]string{name, r.PrimaryZone}, ".")
}