hatecomputers.club/hcdns/server_test.go

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package hcdns_test
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import (
"database/sql"
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"fmt"
"math/rand"
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"os"
"sync"
"testing"
"git.hatecomputers.club/hatecomputers/hatecomputers.club/args"
"git.hatecomputers.club/hatecomputers/hatecomputers.club/database"
"git.hatecomputers.club/hatecomputers/hatecomputers.club/hcdns"
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"git.hatecomputers.club/hatecomputers/hatecomputers.club/utils"
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"github.com/miekg/dns"
)
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func randomPort() int {
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return rand.Intn(3000) + 5192
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}
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func setup(arguments *args.Arguments) (*sql.DB, *dns.Server, string, func()) {
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randomDb := utils.RandomId()
testDb := database.MakeConn(&randomDb)
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database.Migrate(testDb)
testUser := &database.User{
ID: "test",
}
database.FindOrSaveBaseUser(testDb, testUser)
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dnsArguments := arguments
if dnsArguments == nil {
dnsArguments = &args.Arguments{
DnsPort: randomPort(),
}
}
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waitLock := &sync.Mutex{}
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server := hcdns.MakeServer(dnsArguments, testDb)
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server.NotifyStartedFunc = func() {
waitLock.Unlock()
}
waitLock.Lock()
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go func() {
server.ListenAndServe()
}()
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waitLock.Lock()
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address := fmt.Sprintf("127.0.0.1:%d", dnsArguments.DnsPort)
return testDb, server, address, func() {
waitLock.Unlock()
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server.Shutdown()
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testDb.Close()
os.Remove(randomDb)
}
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}
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func TestWhenCNAMEIsResolved(t *testing.T) {
testDb, _, addr, cleanup := setup(nil)
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defer cleanup()
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records := []*database.DNSRecord{
{
ID: "0",
UserID: "test",
Name: "cname.internal.example.com.",
Type: "CNAME",
Content: "next.internal.example.com.",
TTL: 300,
Internal: true,
}, {
ID: "1",
UserID: "test",
Name: "next.internal.example.com.",
Type: "CNAME",
Content: "res.example.com.",
TTL: 300,
Internal: true,
},
{
ID: "2",
UserID: "test",
Name: "res.example.com.",
Type: "A",
Content: "1.2.3.2",
TTL: 300,
Internal: true,
},
}
for _, record := range records {
database.SaveDNSRecord(testDb, record)
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}
qtype := dns.TypeA
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domain := dns.Fqdn("cname.internal.example.com.")
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client := &dns.Client{}
message := &dns.Msg{}
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message.SetQuestion(domain, qtype)
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in, _, err := client.Exchange(message, addr)
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if err != nil {
t.Fatal(err)
}
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if len(in.Answer) != 3 {
t.Fatalf("expected 3 answers, got %d", len(in.Answer))
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}
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for i, record := range records {
if in.Answer[i].Header().Name != record.Name {
t.Fatalf("expected %s, got %s", record.Name, in.Answer[i].Header().Name)
}
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if in.Answer[i].Header().Rrtype != dns.StringToType[record.Type] {
t.Fatalf("expected %s, got %d", record.Type, in.Answer[i].Header().Rrtype)
}
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if int(in.Answer[i].Header().Ttl) != record.TTL {
t.Fatalf("expected %d, got %d", record.TTL, in.Answer[i].Header().Ttl)
}
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if !in.Authoritative {
t.Fatalf("expected authoritative response")
}
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}
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if in.Answer[2].(*dns.A).A.String() != "1.2.3.2" {
t.Fatalf("expected final record to be the A record with correct IP")
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}
}
func TestWhenNoRecordNxDomain(t *testing.T) {
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_, _, addr, cleanup := setup(nil)
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defer cleanup()
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qtype := dns.TypeA
domain := dns.Fqdn("nonexistant.example.com.")
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client := &dns.Client{}
message := &dns.Msg{}
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message.SetQuestion(domain, qtype)
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in, _, err := client.Exchange(message, addr)
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if err != nil {
t.Fatal(err)
}
if len(in.Answer) != 0 {
t.Fatalf("expected 0 answers, got %d", len(in.Answer))
}
if in.Rcode != dns.RcodeNameError {
t.Fatalf("expected NXDOMAIN, got %d", in.Rcode)
}
}
func TestWhenUnresolvingCNAME(t *testing.T) {
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testDb, _, addr, cleanup := setup(nil)
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defer cleanup()
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cname := &database.DNSRecord{
ID: "1",
UserID: "test",
Name: "cname.internal.example.com.",
Type: "CNAME",
Content: "nonexistant.example.com.",
TTL: 300,
Internal: true,
}
database.SaveDNSRecord(testDb, cname)
qtype := dns.TypeA
domain := dns.Fqdn(cname.Name)
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client := &dns.Client{}
message := &dns.Msg{}
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message.SetQuestion(domain, qtype)
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in, _, err := client.Exchange(message, addr)
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if err != nil {
t.Fatal(err)
}
if len(in.Answer) != 1 {
t.Fatalf("expected 1 answer, got %d", len(in.Answer))
}
if !in.Authoritative {
t.Fatalf("expected authoritative response")
}
if in.Answer[0].Header().Name != cname.Name {
t.Fatalf("expected cname.internal.example.com., got %s", in.Answer[0].Header().Name)
}
if in.Answer[0].Header().Rrtype != dns.TypeCNAME {
t.Fatalf("expected CNAME, got %d", in.Answer[0].Header().Rrtype)
}
if in.Answer[0].(*dns.CNAME).Target != cname.Content {
t.Fatalf("expected nonexistant.example.com., got %s", in.Answer[0].(*dns.CNAME).Target)
}
if in.Rcode == dns.RcodeNameError {
t.Fatalf("expected no NXDOMAIN, got %d", in.Rcode)
}
}
func TestWhenUnresolvingCNAMEWithMaxDepth(t *testing.T) {
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testDb, _, addr, cleanup := setup(nil)
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defer cleanup()
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cname := &database.DNSRecord{
ID: "1",
UserID: "test",
Name: "cname.internal.example.com.",
Type: "CNAME",
Content: "cname.internal.example.com.",
TTL: 300,
Internal: true,
}
database.SaveDNSRecord(testDb, cname)
qtype := dns.TypeA
domain := dns.Fqdn(cname.Name)
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client := &dns.Client{}
message := &dns.Msg{}
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message.SetQuestion(domain, qtype)
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in, _, err := client.Exchange(message, addr)
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if err != nil {
t.Fatal(err)
}
if len(in.Answer) > 0 {
t.Fatalf("expected 0 answers, got %d", len(in.Answer))
}
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if in.Rcode != dns.RcodeServerFailure {
t.Fatalf("expected SERVFAIL, got %d", in.Rcode)
}
}
func TestWhenExternalDomain(t *testing.T) {
externalDb, _, externalAddr, externalCleanup := setup(nil)
internalDb, _, internalAddr, internalCleanup := setup(&args.Arguments{
DnsPort: randomPort(),
DnsResolvers: []string{externalAddr},
})
defer internalCleanup()
defer externalCleanup()
authoritativeRecords := []database.DNSRecord{
{
ID: "1",
UserID: "test",
Name: "external.example.com.",
Type: "CNAME",
Content: "external.internal.example.com.",
},
{
ID: "2",
UserID: "test",
Name: "final.example.com.",
Type: "A",
Content: "127.0.0.1",
},
}
internalRecords := []database.DNSRecord{
{
ID: "1",
UserID: "test",
Name: "external.internal.example.com.",
Type: "CNAME",
Content: "final.example.com",
},
{
ID: "2",
UserID: "test",
Name: "test.internal.example.com.",
Type: "CNAME",
Content: "external.example.com.",
},
}
for _, record := range authoritativeRecords {
database.SaveDNSRecord(externalDb, &record)
}
for _, record := range internalRecords {
database.SaveDNSRecord(internalDb, &record)
}
// ensure that if the record doesn't exist in the internal database, it will
// go and query the external dns resolvers, then loop back to the internal
qtype := dns.TypeA
domain := dns.Fqdn("test.internal.example.com.")
client := &dns.Client{}
message := &dns.Msg{}
message.SetQuestion(domain, qtype)
in, _, err := client.Exchange(message, internalAddr)
if err != nil {
t.Fatal(err)
}
if len(in.Answer) != 4 {
t.Fatalf("expected 4 answers, got %d", len(in.Answer))
}
aRecord := in.Answer[3]
if aRecord.Header().Name != authoritativeRecords[1].Name {
t.Fatalf("expected %s, got %s", domain, aRecord.Header().Name)
}
if aRecord.Header().Rrtype != dns.TypeA {
t.Fatalf("expected %s, got %s", dns.TypeToString[aRecord.Header().Rrtype], internalRecords[1].Type)
}
if aRecord.(*dns.A).A.String() != authoritativeRecords[1].Content {
t.Fatalf("expected %s, got %s", authoritativeRecords[1].Content, aRecord.(*dns.A).A.String())
}
if in.Authoritative {
t.Fatalf("expected non-authoritative response")
}
}