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Add managed DNS record support for API endpoint (#232)
* Add managed DNS record support for API endpoint * Add DNS propagation check * Address code review comments * Disallow @ and * DNS names * Fix copyright header
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| /* | ||
| Copyright 2021 The Kubernetes Authors. | ||
| 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 networking | ||
|
|
||
| import ( | ||
| "github.com/miekg/dns" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| type DNSQuerier interface { | ||
| Query(servers []string, msg *dns.Msg) (*dns.Msg, error) | ||
| LocalQuery(msg *dns.Msg) (*dns.Msg, error) | ||
| } | ||
|
|
||
| type DNSResolver struct { | ||
| config *dns.ClientConfig | ||
| client *dns.Client | ||
| } | ||
|
|
||
| func NewDNSResolver() (*DNSResolver, error) { | ||
| dnsConfig, err := dns.ClientConfigFromFile("/etc/resolv.conf") | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "unable to get DNS config") | ||
| } | ||
| sq := &DNSResolver{ | ||
| config: dnsConfig, | ||
| client: new(dns.Client), | ||
| } | ||
| return sq, nil | ||
| } | ||
|
|
||
| func (dr *DNSResolver) Query(servers []string, msg *dns.Msg) (*dns.Msg, error) { | ||
| for _, server := range servers { | ||
| r, _, err := dr.client.Exchange(msg, server+":"+dr.config.Port) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if r == nil || r.Rcode == dns.RcodeNameError || r.Rcode == dns.RcodeSuccess { | ||
| return r, err | ||
| } | ||
| } | ||
| return nil, errors.New("No name server to answer the question") | ||
| } | ||
|
|
||
| func (dr *DNSResolver) LocalQuery(msg *dns.Msg) (*dns.Msg, error) { | ||
| return dr.Query(dr.config.Servers, msg) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| Copyright 2021 The Kubernetes Authors. | ||
| 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 networking | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
|
|
||
| "github.com/digitalocean/godo" | ||
| ) | ||
|
|
||
| // GetDomainRecord retrieves a single domain record from DO. | ||
| func (s *Service) GetDomainRecord(domain, name, rType string) (*godo.DomainRecord, error) { | ||
| fqdn := fmt.Sprintf("%s.%s", name, domain) | ||
| records, resp, err := s.scope.Domains.RecordsByTypeAndName(s.ctx, domain, rType, fqdn, nil) | ||
| if err != nil { | ||
| if resp != nil && resp.StatusCode == http.StatusNotFound { | ||
| return nil, nil | ||
| } | ||
| return nil, err | ||
| } | ||
| switch len(records) { | ||
| case 0: | ||
| return nil, nil | ||
| case 1: | ||
| return &records[0], nil | ||
| default: | ||
| return nil, fmt.Errorf("multiple DNS records (%d) found for '%s.%s' type %s", | ||
| len(records), name, domain, rType) | ||
| } | ||
| } | ||
|
|
||
| // UpsertDomainRecord creates or updates a DO domain record. | ||
| func (s *Service) UpsertDomainRecord(domain, name, rType, data string) error { | ||
| record, err := s.GetDomainRecord(domain, name, rType) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to get current DNS record from API: %s", err) | ||
| } | ||
| recordReq := &godo.DomainRecordEditRequest{ | ||
| Type: rType, | ||
| Name: name, | ||
| Data: data, | ||
| TTL: 30, | ||
| } | ||
| if record == nil { | ||
| _, _, err = s.scope.Domains.CreateRecord(s.ctx, domain, recordReq) | ||
| } else { | ||
| _, _, err = s.scope.Domains.EditRecord(s.ctx, domain, record.ID, recordReq) | ||
| } | ||
| return err | ||
| } | ||
|
|
||
| // DeleteDomainRecord removes a DO domain record. | ||
| func (s *Service) DeleteDomainRecord(domain, name, rType string) error { | ||
| record, err := s.GetDomainRecord(domain, name, rType) | ||
| if err != nil { | ||
| return fmt.Errorf("unable to get current DNS record from API: %s", err) | ||
| } | ||
| if record == nil { | ||
| return nil | ||
| } | ||
| _, err = s.scope.Domains.DeleteRecord(s.ctx, domain, record.ID) | ||
| return err | ||
| } |
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