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package test
import (
"fmt"
"io"
"strings"
"testing"
"time"
"github.com/coredns/coredns/plugin/test"
"github.com/miekg/dns"
)
func TestLargeAXFR(t *testing.T) {
// Build a large zone in text format. It contains 64K AAAA RRs.
var sb strings.Builder
const numAAAAs = 65536
sb.WriteString("example.com. IN SOA . . 1 60 60 60 60\n")
sb.WriteString("example.com. IN NS ns.example.\n")
for i := 0; i < numAAAAs; i++ {
sb.WriteString(fmt.Sprintf("%d.example.com. IN AAAA 2001:db8::1\n", i))
}
// Setup the zone file and CoreDNS to serve the zone, allowing zone transfer
name, rm, err := test.TempFile(".", sb.String())
if err != nil {
t.Fatalf("Failed to create zone: %s", err)
}
defer rm()
corefile := `example.com:0 {
file ` + name + ` {
transfer to *
}
}
`
// Start server, and send an AXFR query to the TCP port. We set the deadline to prevent the test from hanging.
i, _, tcp, err := CoreDNSServerAndPorts(corefile)
if err != nil {
t.Fatalf("Could not get CoreDNS serving instance: %s", err)
}
defer i.Stop()
m := new(dns.Msg)
m.SetQuestion("example.com.", dns.TypeAXFR)
co, err := dns.DialTimeout("tcp", tcp, 5*time.Second)
if err != nil {
t.Fatalf("Expected to establish TCP connection, but didn't: %s", err)
}
defer co.Close()
co.SetWriteDeadline(time.Now().Add(5 * time.Second))
err = co.WriteMsg(m)
if err != nil {
t.Fatalf("Unable to send TCP query: %s", err)
}
nrr := 0 // total number of transferred RRs
co.SetReadDeadline(time.Now().Add(60 * time.Second)) // use a longer timeout as it involves transferring a non-trivial amount of data.
for {
resp, err := co.ReadMsg()
if err != nil {
t.Fatalf("Expected to receive reply, but didn't: %s", err)
}
if len(resp.Answer) == 0 {
continue
}
// First RR should be SOA.
if nrr == 0 && resp.Answer[0].Header().Rrtype != dns.TypeSOA {
t.Fatalf("Expected SOA, but got type %d", resp.Answer[0].Header().Rrtype)
}
nrr += len(resp.Answer)
// If we see another SOA at the end of the message, we are done.
// Note that this check is not enough to detect all invalid responses, but checking those is not the purpose of this test.
if nrr > 1 && resp.Answer[len(resp.Answer)-1].Header().Rrtype == dns.TypeSOA {
break
}
}
// On successful completion, 2 SOA, 1 NS, and all AAAAs should have been transferred.
if nrr != numAAAAs+3 {
t.Fatalf("Got an unexpected number of RRs: %d", nrr)
}
// At the time of the initial implementation of this test, the remaining check would fail due to the problem described in PR #2866, so we return here.
// Once the issue is resolved this workaround should be removed to enable the check.
return
// Once xfr is completed the server should close the connection, so a further read should result in an EOF error.
// This time we use a short timeout to make it faster in case the server doesn't behave as expected.
co.SetReadDeadline(time.Now().Add(time.Second))
_, err = co.ReadMsg()
if err == nil {
t.Fatalf("Expected failure on further read, but it succeeded")
}
if err != io.EOF {
t.Fatalf("Expected EOF on further read, but got a different error: %v", err)
}
}
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