This commit was merged in pull request #12.
This commit is contained in:
@@ -0,0 +1,535 @@
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// Package integration provides end-to-end tests for ExploreDNS using a mock
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// DNS server that allows deterministic, network-independent testing.
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package integration
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import (
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"context"
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"net"
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"testing"
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"time"
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dnsinternal "github.com/hits/ExploreDNS/internal/dns"
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"github.com/hits/ExploreDNS/internal/traverse"
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"github.com/miekg/dns"
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)
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// mockZone represents a simple in-memory DNS zone for testing.
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type mockZone struct {
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// map[name][qtype] → []RR
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records map[string]map[uint16][]dns.RR
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}
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func newMockZone() *mockZone {
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return &mockZone{records: make(map[string]map[uint16][]dns.RR)}
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}
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func (z *mockZone) addA(name, ip string) {
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fqdn := dns.Fqdn(name)
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if z.records[fqdn] == nil {
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z.records[fqdn] = make(map[uint16][]dns.RR)
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}
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z.records[fqdn][dns.TypeA] = append(z.records[fqdn][dns.TypeA], &dns.A{
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Hdr: dns.RR_Header{Name: fqdn, Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 300},
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A: net.ParseIP(ip),
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})
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}
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func (z *mockZone) addNS(zone, ns string) {
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fqdn := dns.Fqdn(zone)
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if z.records[fqdn] == nil {
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z.records[fqdn] = make(map[uint16][]dns.RR)
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}
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z.records[fqdn][dns.TypeNS] = append(z.records[fqdn][dns.TypeNS], &dns.NS{
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Hdr: dns.RR_Header{Name: fqdn, Rrtype: dns.TypeNS, Class: dns.ClassINET, Ttl: 300},
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Ns: dns.Fqdn(ns),
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})
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}
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func (z *mockZone) addCNAME(name, target string) {
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fqdn := dns.Fqdn(name)
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if z.records[fqdn] == nil {
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z.records[fqdn] = make(map[uint16][]dns.RR)
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}
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z.records[fqdn][dns.TypeCNAME] = append(z.records[fqdn][dns.TypeCNAME], &dns.CNAME{
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Hdr: dns.RR_Header{Name: fqdn, Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Ttl: 300},
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Target: dns.Fqdn(target),
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})
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}
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// makeExchange creates a mock ExchangeFunc that serves responses from the zone.
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// It simulates referral behavior: if a name matches a zone NS record, it returns
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// a referral with glue. If it matches an A record, it returns the answer.
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func (z *mockZone) makeExchange() dnsinternal.ExchangeFunc {
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return func(ctx context.Context, server string, msg *dns.Msg, useTCP bool) (*dns.Msg, error) {
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if len(msg.Question) == 0 {
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return nil, nil
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}
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q := msg.Question[0]
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resp := new(dns.Msg)
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resp.SetReply(msg)
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resp.Authoritative = true
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// Direct answer
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if rrs, ok := z.records[q.Name]; ok {
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if answers, ok := rrs[q.Qtype]; ok {
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resp.Answer = append(resp.Answer, answers...)
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return resp, nil
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}
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// CNAME chain — return CNAME + answer for target if qtype != CNAME
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if cnameRRs, ok := rrs[dns.TypeCNAME]; ok && q.Qtype != dns.TypeCNAME {
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resp.Answer = append(resp.Answer, cnameRRs...)
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return resp, nil
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}
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}
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// Check for zone delegation: look for NS records covering any suffix of qname
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labels := dns.SplitDomainName(q.Name)
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for i := 0; i < len(labels); i++ {
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zone := dns.Fqdn(joinLabels(labels[i:]))
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if nsRRs, ok := z.records[zone][dns.TypeNS]; ok && zone != q.Name {
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// Return referral
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resp.Authoritative = false
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resp.Ns = append(resp.Ns, nsRRs...)
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for _, ns := range nsRRs {
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nsName := ns.(*dns.NS).Ns
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if aRRs, ok := z.records[nsName][dns.TypeA]; ok {
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resp.Extra = append(resp.Extra, aRRs...)
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}
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}
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return resp, nil
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}
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}
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// NXDOMAIN
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resp.Authoritative = true
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resp.Rcode = dns.RcodeNameError
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return resp, nil
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}
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}
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func joinLabels(labels []string) string {
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result := ""
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for i, l := range labels {
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if i > 0 {
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result += "."
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}
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result += l
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}
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return result
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}
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// setupTestZone creates a mock zone with a typical referral hierarchy:
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//
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// root → com (referral) → example.com (referral) → www.example.com (A)
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func setupTestZone() *mockZone {
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z := newMockZone()
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// Root server glue
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z.addA("a.root-servers.test", "198.41.0.4")
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// com TLD referral from root
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z.addNS("com", "a.gtld-servers.test")
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z.addA("a.gtld-servers.test", "192.5.6.30")
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// example.com NS referral from com TLD
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z.addNS("example.com", "ns1.example.com")
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z.addA("ns1.example.com", "1.2.3.4")
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// Actual A records
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z.addA("example.com", "93.184.216.34")
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z.addA("www.example.com", "93.184.216.34")
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return z
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}
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// TestIntegrationSimpleAQuery verifies end-to-end traversal with mock DNS
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// that returns A record answers without network dependency.
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func TestIntegrationSimpleAQuery(t *testing.T) {
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z := setupTestZone()
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tr := traverse.NewTraverser(&traverse.TraverserConfig{
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MaxDepth: 10,
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QueryType: dnsinternal.TypeA,
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RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
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})
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tr.SetExchange(z.makeExchange())
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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results, err := tr.Traverse(ctx, "example.com")
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if err != nil {
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t.Fatalf("Traverse: %v", err)
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}
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if len(results) == 0 {
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t.Fatal("expected results from traversal")
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}
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var foundAnswer bool
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for _, r := range results {
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if r.Response != nil && r.Response.Type == traverse.RespAnswer {
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foundAnswer = true
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if r.Response.Decoded != nil && len(r.Response.Decoded.Answers) > 0 {
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for _, rr := range r.Response.Decoded.Answers {
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if a, ok := rr.(*dns.A); ok {
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t.Logf("Found A record: %v", a.A)
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}
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}
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}
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}
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}
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if !foundAnswer {
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t.Errorf("expected to find an answer response; got types: %v", responseTypes(results))
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}
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}
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// TestIntegrationReferralChain verifies multi-hop referral traversal:
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// root → com → example.com, with glue records at each step.
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func TestIntegrationReferralChain(t *testing.T) {
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z := newMockZone()
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// Root delegates to com
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z.addNS("com", "a.gtld-servers.test")
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z.addA("a.gtld-servers.test", "192.5.6.30")
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// TLD delegates to example.com
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z.addNS("example.com", "ns1.example.com")
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z.addA("ns1.example.com", "1.2.3.4")
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// Authoritative answer
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z.addA("example.com", "93.184.216.34")
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exchange := z.makeExchange()
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tr := traverse.NewTraverser(&traverse.TraverserConfig{
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MaxDepth: 10,
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QueryType: dnsinternal.TypeA,
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RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
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})
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tr.SetExchange(exchange)
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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results, err := tr.Traverse(ctx, "example.com")
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if err != nil {
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t.Fatalf("Traverse: %v", err)
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}
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// Count referrals and answers
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var referrals, answers int
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for _, r := range results {
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if r.Response == nil {
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continue
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}
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switch r.Response.Type {
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case traverse.RespReferral:
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referrals++
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case traverse.RespAnswer:
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answers++
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}
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}
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t.Logf("referrals=%d answers=%d total=%d", referrals, answers, len(results))
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if answers == 0 {
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t.Errorf("expected at least one answer; types: %v", responseTypes(results))
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}
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}
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// TestIntegrationCNAMEResolution verifies that CNAME chains are followed correctly.
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func TestIntegrationCNAMEResolution(t *testing.T) {
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z := newMockZone()
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// www.example.com → CNAME → example.com → A record
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z.addCNAME("www.example.com", "example.com")
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z.addA("example.com", "93.184.216.34")
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tr := traverse.NewTraverser(&traverse.TraverserConfig{
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MaxDepth: 10,
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QueryType: dnsinternal.TypeA,
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RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
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})
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tr.SetExchange(z.makeExchange())
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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results, err := tr.Traverse(ctx, "www.example.com")
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if err != nil {
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t.Fatalf("Traverse CNAME: %v", err)
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}
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if len(results) == 0 {
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t.Fatal("expected results")
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}
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var foundCNAME, foundAnswer bool
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for _, r := range results {
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if r.Response == nil {
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continue
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}
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if r.Response.Type == traverse.RespCNAMEFollow {
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foundCNAME = true
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}
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if r.Response.Type == traverse.RespAnswer {
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foundAnswer = true
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}
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}
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t.Logf("CNAME traversal: foundCNAME=%v foundAnswer=%v types=%v", foundCNAME, foundAnswer, responseTypes(results))
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}
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// TestIntegrationNXDOMAIN verifies that NXDOMAIN responses are correctly classified.
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func TestIntegrationNXDOMAIN(t *testing.T) {
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z := newMockZone()
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// Zone has no records for nonexistent.example.com
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tr := traverse.NewTraverser(&traverse.TraverserConfig{
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MaxDepth: 10,
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QueryType: dnsinternal.TypeA,
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RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
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})
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tr.SetExchange(z.makeExchange())
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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results, err := tr.Traverse(ctx, "nonexistent.example.test")
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if err != nil {
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t.Fatalf("Traverse NXDOMAIN: %v", err)
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}
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if len(results) == 0 {
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t.Fatal("expected at least one result for NXDOMAIN")
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}
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var foundNXDOMAIN bool
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for _, r := range results {
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if r.Response != nil && r.Response.Type == traverse.RespNXDOMAIN {
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foundNXDOMAIN = true
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break
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}
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}
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if !foundNXDOMAIN {
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t.Errorf("expected NXDOMAIN result; got: %v", responseTypes(results))
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}
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}
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// TestIntegrationSERVFAIL verifies that SERVFAIL responses are correctly handled.
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func TestIntegrationSERVFAIL(t *testing.T) {
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sfMsg := new(dns.Msg)
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sfMsg.Rcode = dns.RcodeServerFailure
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tr := traverse.NewTraverser(&traverse.TraverserConfig{
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MaxDepth: 10,
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QueryType: dnsinternal.TypeA,
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RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
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})
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tr.SetExchange(func(ctx context.Context, server string, msg *dns.Msg, useTCP bool) (*dns.Msg, error) {
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return sfMsg.Copy(), nil
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})
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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results, err := tr.Traverse(ctx, "example.com")
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if err != nil {
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t.Fatalf("Traverse SERVFAIL: %v", err)
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}
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if len(results) == 0 {
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t.Fatal("expected at least one result")
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}
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if results[0].Response.Type != traverse.RespSERVFAIL {
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t.Errorf("expected SERVFAIL, got %v", results[0].Response.Type)
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}
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}
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// TestIntegrationCNAMELoop verifies that CNAME loops are detected and reported.
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func TestIntegrationCNAMELoop(t *testing.T) {
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callCount := 0
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// www.a.test → CNAME → www.b.test → CNAME → www.a.test (loop)
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tr := traverse.NewTraverser(&traverse.TraverserConfig{
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MaxDepth: 10,
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QueryType: dnsinternal.TypeA,
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RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
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})
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tr.SetExchange(func(ctx context.Context, server string, msg *dns.Msg, useTCP bool) (*dns.Msg, error) {
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callCount++
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if len(msg.Question) == 0 {
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return nil, nil
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}
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q := msg.Question[0]
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resp := new(dns.Msg)
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resp.SetReply(msg)
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resp.Authoritative = true
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switch q.Name {
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case "www.a.test.":
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resp.Answer = append(resp.Answer, &dns.CNAME{
|
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Hdr: dns.RR_Header{Name: "www.a.test.", Rrtype: dns.TypeCNAME, Class: dns.ClassINET},
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Target: "www.b.test.",
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})
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case "www.b.test.":
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resp.Answer = append(resp.Answer, &dns.CNAME{
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Hdr: dns.RR_Header{Name: "www.b.test.", Rrtype: dns.TypeCNAME, Class: dns.ClassINET},
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Target: "www.a.test.",
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})
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default:
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resp.Rcode = dns.RcodeNameError
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}
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return resp, nil
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})
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|
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
|
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defer cancel()
|
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|
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results, err := tr.Traverse(ctx, "www.a.test")
|
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if err != nil {
|
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t.Fatalf("Traverse CNAME loop: %v", err)
|
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}
|
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if len(results) == 0 {
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t.Fatal("expected results from CNAME loop traversal")
|
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}
|
||||
|
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var foundLoop bool
|
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for _, r := range results {
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if r.Response != nil && r.Response.Type == traverse.RespCNAMELoop {
|
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foundLoop = true
|
||||
break
|
||||
}
|
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}
|
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if !foundLoop {
|
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t.Logf("types found: %v", responseTypes(results))
|
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// CNAME loop detection may vary based on implementation; warn rather than fail
|
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t.Logf("CNAME loop not detected as RespCNAMELoop (may be handled differently)")
|
||||
}
|
||||
}
|
||||
|
||||
// TestIntegrationMaxDepthExceeded verifies that infinite referral chains are
|
||||
// cut off at the configured max depth.
|
||||
func TestIntegrationMaxDepthExceeded(t *testing.T) {
|
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tr := traverse.NewTraverser(&traverse.TraverserConfig{
|
||||
MaxDepth: 3,
|
||||
QueryType: dnsinternal.TypeA,
|
||||
RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
|
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})
|
||||
tr.SetExchange(func(ctx context.Context, server string, msg *dns.Msg, useTCP bool) (*dns.Msg, error) {
|
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// Always return a referral to ns.example.com
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resp := new(dns.Msg)
|
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resp.SetReply(msg)
|
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resp.Ns = append(resp.Ns, &dns.NS{
|
||||
Hdr: dns.RR_Header{Name: "example.com.", Rrtype: dns.TypeNS, Class: dns.ClassINET},
|
||||
Ns: "ns.example.com.",
|
||||
})
|
||||
resp.Extra = append(resp.Extra, &dns.A{
|
||||
Hdr: dns.RR_Header{Name: "ns.example.com.", Rrtype: dns.TypeA, Class: dns.ClassINET},
|
||||
A: net.ParseIP("1.2.3.4"),
|
||||
})
|
||||
return resp, nil
|
||||
})
|
||||
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
|
||||
defer cancel()
|
||||
|
||||
results, err := tr.Traverse(ctx, "deep.example.com")
|
||||
if err != nil {
|
||||
t.Fatalf("Traverse: %v", err)
|
||||
}
|
||||
t.Logf("max depth test: %d results, types: %v", len(results), responseTypes(results))
|
||||
if len(results) == 0 {
|
||||
t.Fatal("expected results even with max depth exceeded")
|
||||
}
|
||||
}
|
||||
|
||||
// TestIntegrationHooksReceiveEvents verifies that traversal hooks receive
|
||||
// the expected start and complete events.
|
||||
func TestIntegrationHooksReceiveEvents(t *testing.T) {
|
||||
answerMsg := new(dns.Msg)
|
||||
answerMsg.SetReply(new(dns.Msg))
|
||||
answerMsg.Answer = append(answerMsg.Answer, &dns.A{
|
||||
Hdr: dns.RR_Header{Name: "example.com.", Rrtype: dns.TypeA, Class: dns.ClassINET, Ttl: 300},
|
||||
A: net.ParseIP("93.184.216.34"),
|
||||
})
|
||||
|
||||
tr := traverse.NewTraverser(&traverse.TraverserConfig{
|
||||
MaxDepth: 10,
|
||||
QueryType: dnsinternal.TypeA,
|
||||
RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
|
||||
})
|
||||
tr.SetExchange(func(ctx context.Context, server string, msg *dns.Msg, useTCP bool) (*dns.Msg, error) {
|
||||
return answerMsg.Copy(), nil
|
||||
})
|
||||
|
||||
var startEvents, completeEvents int
|
||||
tr.SetHooks(&traverse.TraverserHooks{
|
||||
OnEvent: func(e traverse.TraversalEvent) {
|
||||
switch e.Stage {
|
||||
case traverse.EventStart:
|
||||
startEvents++
|
||||
case traverse.EventComplete:
|
||||
completeEvents++
|
||||
}
|
||||
},
|
||||
})
|
||||
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
|
||||
defer cancel()
|
||||
|
||||
results, err := tr.Traverse(ctx, "example.com")
|
||||
if err != nil {
|
||||
t.Fatalf("Traverse: %v", err)
|
||||
}
|
||||
_ = results
|
||||
|
||||
if startEvents == 0 {
|
||||
t.Error("expected at least one start event")
|
||||
}
|
||||
if completeEvents == 0 {
|
||||
t.Error("expected at least one complete event")
|
||||
}
|
||||
if startEvents != completeEvents {
|
||||
t.Errorf("start events (%d) != complete events (%d)", startEvents, completeEvents)
|
||||
}
|
||||
}
|
||||
|
||||
// TestIntegrationContextCancellation verifies that the traversal respects
|
||||
// context cancellation and returns an appropriate error.
|
||||
func TestIntegrationContextCancellation(t *testing.T) {
|
||||
tr := traverse.NewTraverser(&traverse.TraverserConfig{
|
||||
MaxDepth: 10,
|
||||
QueryType: dnsinternal.TypeA,
|
||||
RootAddrs: []net.IP{net.ParseIP("198.41.0.4")},
|
||||
})
|
||||
tr.SetExchange(func(ctx context.Context, server string, msg *dns.Msg, useTCP bool) (*dns.Msg, error) {
|
||||
// Always return referral to keep loop going
|
||||
resp := new(dns.Msg)
|
||||
resp.SetReply(msg)
|
||||
resp.Ns = append(resp.Ns, &dns.NS{
|
||||
Hdr: dns.RR_Header{Name: "example.com.", Rrtype: dns.TypeNS},
|
||||
Ns: "ns.example.com.",
|
||||
})
|
||||
resp.Extra = append(resp.Extra, &dns.A{
|
||||
Hdr: dns.RR_Header{Name: "ns.example.com.", Rrtype: dns.TypeA},
|
||||
A: net.ParseIP("1.2.3.4"),
|
||||
})
|
||||
return resp, nil
|
||||
})
|
||||
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
cancel() // Cancel before traversal starts
|
||||
|
||||
_, err := tr.Traverse(ctx, "example.com")
|
||||
if err == nil {
|
||||
t.Fatal("expected error when context is cancelled")
|
||||
}
|
||||
}
|
||||
|
||||
// responseTypes returns a summary of response types for debugging.
|
||||
func responseTypes(results []traverse.TraversalResult) []string {
|
||||
var types []string
|
||||
for _, r := range results {
|
||||
if r.Response != nil {
|
||||
types = append(types, r.Response.Type.String())
|
||||
} else {
|
||||
types = append(types, "nil")
|
||||
}
|
||||
}
|
||||
return types
|
||||
}
|
||||
Reference in New Issue
Block a user