584dd87c70
* Update vendor Signed-off-by: Yong Tang <yong.tang.github@outlook.com> * Add route53 plugin This fix adds route53 plugin so that it is possible to query route53 record through CoreDNS. Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
97 lines
2.6 KiB
Go
97 lines
2.6 KiB
Go
// Package route53 implements a plugin that returns resource records
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// from AWS route53
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package route53
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import (
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"net"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/request"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/service/route53"
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"github.com/aws/aws-sdk-go/service/route53/route53iface"
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"github.com/miekg/dns"
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"golang.org/x/net/context"
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)
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// Route53 is a plugin that returns RR from AWS route53
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type Route53 struct {
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Next plugin.Handler
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zones []string
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keys map[string]string
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client route53iface.Route53API
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}
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// ServeDNS implements the plugin.Handler interface.
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func (rr Route53) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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state := request.Request{W: w, Req: r}
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qname := state.Name()
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zone := plugin.Zones(rr.zones).Matches(qname)
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if zone == "" {
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return plugin.NextOrFailure(rr.Name(), rr.Next, ctx, w, r)
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}
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output, err := rr.client.ListResourceRecordSets(&route53.ListResourceRecordSetsInput{
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HostedZoneId: aws.String(rr.keys[zone]),
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StartRecordName: aws.String(qname),
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StartRecordType: aws.String(state.Type()),
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MaxItems: aws.String("1"),
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})
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if err != nil {
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return dns.RcodeServerFailure, err
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}
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answers := []dns.RR{}
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switch state.QType() {
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case dns.TypeA:
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answers = a(qname, output.ResourceRecordSets)
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case dns.TypeAAAA:
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answers = aaaa(qname, output.ResourceRecordSets)
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}
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if len(answers) == 0 {
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return plugin.NextOrFailure(rr.Name(), rr.Next, ctx, w, r)
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}
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m := new(dns.Msg)
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m.SetReply(r)
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m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true
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m.Answer = answers
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state.SizeAndDo(m)
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m, _ = state.Scrub(m)
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w.WriteMsg(m)
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return dns.RcodeSuccess, nil
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}
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func a(zone string, rrss []*route53.ResourceRecordSet) []dns.RR {
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answers := []dns.RR{}
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for _, rrs := range rrss {
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for _, rr := range rrs.ResourceRecords {
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r := new(dns.A)
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r.Hdr = dns.RR_Header{Name: zone, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: uint32(aws.Int64Value(rrs.TTL))}
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r.A = net.ParseIP(aws.StringValue(rr.Value)).To4()
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answers = append(answers, r)
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}
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}
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return answers
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}
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func aaaa(zone string, rrss []*route53.ResourceRecordSet) []dns.RR {
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answers := []dns.RR{}
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for _, rrs := range rrss {
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for _, rr := range rrs.ResourceRecords {
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r := new(dns.AAAA)
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r.Hdr = dns.RR_Header{Name: zone, Rrtype: dns.TypeAAAA, Class: dns.ClassINET, Ttl: uint32(aws.Int64Value(rrs.TTL))}
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r.AAAA = net.ParseIP(aws.StringValue(rr.Value)).To16()
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answers = append(answers, r)
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}
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}
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return answers
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}
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// Name implements the Handler interface.
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func (rr Route53) Name() string { return "route53" }
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