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tailscale/appc/appconnector_test.go

147 lines
4.4 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package appc
import (
"net/netip"
"slices"
"testing"
xmaps "golang.org/x/exp/maps"
"golang.org/x/net/dns/dnsmessage"
"tailscale.com/util/must"
)
func TestUpdateDomains(t *testing.T) {
a := NewAppConnector(t.Logf, nil)
a.UpdateDomains([]string{"example.com"})
if got, want := a.Domains().AsSlice(), []string{"example.com"}; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
addr := netip.MustParseAddr("192.0.0.8")
a.domains["example.com"] = append(a.domains["example.com"], addr)
a.UpdateDomains([]string{"example.com"})
if got, want := a.domains["example.com"], []netip.Addr{addr}; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
// domains are explicitly downcased on set.
a.UpdateDomains([]string{"UP.EXAMPLE.COM"})
if got, want := xmaps.Keys(a.domains), []string{"up.example.com"}; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
}
func TestObserveDNSResponse(t *testing.T) {
rc := &routeCollector{}
a := NewAppConnector(t.Logf, rc)
// a has no domains configured, so it should not advertise any routes
a.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
if got, want := rc.routes, ([]netip.Prefix)(nil); !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
wantRoutes := []netip.Prefix{netip.MustParsePrefix("192.0.0.8/32")}
a.UpdateDomains([]string{"example.com"})
a.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
if got, want := rc.routes, wantRoutes; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
wantRoutes = append(wantRoutes, netip.MustParsePrefix("2001:db8::1/128"))
a.ObserveDNSResponse(dnsResponse("example.com.", "2001:db8::1"))
if got, want := rc.routes, wantRoutes; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
// don't re-advertise routes that have already been advertised
a.ObserveDNSResponse(dnsResponse("example.com.", "2001:db8::1"))
if !slices.Equal(rc.routes, wantRoutes) {
t.Errorf("got %v; want %v", rc.routes, wantRoutes)
}
}
func TestWildcardDomains(t *testing.T) {
rc := &routeCollector{}
a := NewAppConnector(t.Logf, rc)
a.UpdateDomains([]string{"*.example.com"})
a.ObserveDNSResponse(dnsResponse("foo.example.com.", "192.0.0.8"))
if got, want := rc.routes, []netip.Prefix{netip.MustParsePrefix("192.0.0.8/32")}; !slices.Equal(got, want) {
t.Errorf("routes: got %v; want %v", got, want)
}
if got, want := a.wildcards, []string{"example.com"}; !slices.Equal(got, want) {
t.Errorf("wildcards: got %v; want %v", got, want)
}
a.UpdateDomains([]string{"*.example.com", "example.com"})
if _, ok := a.domains["foo.example.com"]; !ok {
t.Errorf("expected foo.example.com to be preserved in domains due to wildcard")
}
if got, want := a.wildcards, []string{"example.com"}; !slices.Equal(got, want) {
t.Errorf("wildcards: got %v; want %v", got, want)
}
// There was an early regression where the wildcard domain was added repeatedly, this guards against that.
a.UpdateDomains([]string{"*.example.com", "example.com"})
if len(a.wildcards) != 1 {
t.Errorf("expected only one wildcard domain, got %v", a.wildcards)
}
}
// dnsResponse is a test helper that creates a DNS response buffer for the given domain and address
func dnsResponse(domain, address string) []byte {
addr := netip.MustParseAddr(address)
b := dnsmessage.NewBuilder(nil, dnsmessage.Header{})
b.EnableCompression()
b.StartAnswers()
switch addr.BitLen() {
case 32:
b.AResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName(domain),
Type: dnsmessage.TypeA,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.AResource{
A: addr.As4(),
},
)
case 128:
b.AAAAResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName(domain),
Type: dnsmessage.TypeAAAA,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.AAAAResource{
AAAA: addr.As16(),
},
)
default:
panic("invalid address length")
}
return must.Get(b.Finish())
}
// routeCollector is a test helper that collects the list of routes advertised
type routeCollector struct {
routes []netip.Prefix
}
// routeCollector implements RouteAdvertiser
var _ RouteAdvertiser = (*routeCollector)(nil)
func (rc *routeCollector) AdvertiseRoute(pfx netip.Prefix) error {
rc.routes = append(rc.routes, pfx)
return nil
}