101 lines
3 KiB
Go
101 lines
3 KiB
Go
package test
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import (
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"fmt"
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"strings"
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"testing"
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"time"
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"github.com/coredns/coredns/plugin/test"
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"github.com/miekg/dns"
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)
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func TestLargeAXFR(t *testing.T) {
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// Build a large zone in text format. It contains 64K AAAA RRs.
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var sb strings.Builder
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const numAAAAs = 65536
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sb.WriteString("example.com. IN SOA . . 1 60 60 60 60\n")
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sb.WriteString("example.com. IN NS ns.example.\n")
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for i := 0; i < numAAAAs; i++ {
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sb.WriteString(fmt.Sprintf("%d.example.com. IN AAAA 2001:db8::1\n", i))
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}
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// Setup the zone file and CoreDNS to serve the zone, allowing zone transfer
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name, rm, err := test.TempFile(".", sb.String())
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if err != nil {
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t.Fatalf("Failed to create zone: %s", err)
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}
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defer rm()
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corefile := `example.com:0 {
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file ` + name + ` {
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transfer to *
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}
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}`
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// Start server, and send an AXFR query to the TCP port. We set the deadline to prevent the test from hanging.
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i, _, tcp, err := CoreDNSServerAndPorts(corefile)
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if err != nil {
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t.Fatalf("Could not get CoreDNS serving instance: %s", err)
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}
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defer i.Stop()
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m := new(dns.Msg)
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m.SetQuestion("example.com.", dns.TypeAXFR)
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co, err := dns.DialTimeout("tcp", tcp, 5*time.Second)
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if err != nil {
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t.Fatalf("Expected to establish TCP connection, but didn't: %s", err)
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}
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defer co.Close()
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co.SetWriteDeadline(time.Now().Add(5 * time.Second))
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err = co.WriteMsg(m)
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if err != nil {
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t.Fatalf("Unable to send AXFR/TCP query: %s", err)
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}
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// Then send another query on the same connection. We use this to confirm that multiple outstanding queries won't cause a race.
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m.SetQuestion("0.example.com.", dns.TypeAAAA)
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err = co.WriteMsg(m)
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if err != nil {
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t.Fatalf("Unable to send AAAA/TCP query: %s", err)
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}
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// The AXFR query should be responded first.
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nrr := 0 // total number of transferred RRs
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for {
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resp, err := co.ReadMsg()
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if err != nil {
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t.Fatalf("Expected to receive reply, but didn't: %s", err)
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}
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if len(resp.Answer) == 0 {
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continue
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}
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// First RR should be SOA.
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if nrr == 0 && resp.Answer[0].Header().Rrtype != dns.TypeSOA {
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t.Fatalf("Expected SOA, but got type %d", resp.Answer[0].Header().Rrtype)
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}
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nrr += len(resp.Answer)
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// If we see another SOA at the end of the message, we are done.
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// Note that this check is not enough to detect all invalid responses, but checking those is not the purpose of this test.
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if nrr > 1 && resp.Answer[len(resp.Answer)-1].Header().Rrtype == dns.TypeSOA {
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break
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}
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}
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// On successful completion, 2 SOA, 1 NS, and all AAAAs should have been transferred.
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if nrr != numAAAAs+3 {
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t.Fatalf("Got an unexpected number of RRs: %d", nrr)
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}
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// The file plugin shouldn't hijack or (yet) close the connection, so the second query should also be responded.
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resp, err := co.ReadMsg()
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if err != nil {
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t.Fatalf("Expected to receive reply, but didn't: %s", err)
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}
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if len(resp.Answer) < 1 {
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t.Fatalf("Expected a non-empty answer, but it was empty")
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}
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if resp.Answer[len(resp.Answer)-1].Header().Rrtype != dns.TypeAAAA {
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t.Fatalf("Expected a AAAA answer, but it wasn't: type %d", resp.Answer[len(resp.Answer)-1].Header().Rrtype)
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}
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}
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