523 lines
18 KiB
Go
523 lines
18 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package appc
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import (
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"context"
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"net/netip"
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"reflect"
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"slices"
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"testing"
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xmaps "golang.org/x/exp/maps"
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"golang.org/x/net/dns/dnsmessage"
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"tailscale.com/appc/appctest"
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"tailscale.com/util/mak"
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"tailscale.com/util/must"
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)
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func fakeStoreRoutes(*RouteInfo) error { return nil }
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func TestUpdateDomains(t *testing.T) {
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for _, shouldStore := range []bool{false, true} {
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ctx := context.Background()
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var a *AppConnector
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if shouldStore {
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a = NewAppConnector(t.Logf, &appctest.RouteCollector{}, &RouteInfo{}, fakeStoreRoutes)
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} else {
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a = NewAppConnector(t.Logf, &appctest.RouteCollector{}, nil, nil)
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}
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a.UpdateDomains([]string{"example.com"})
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a.Wait(ctx)
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if got, want := a.Domains().AsSlice(), []string{"example.com"}; !slices.Equal(got, want) {
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t.Errorf("got %v; want %v", got, want)
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}
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addr := netip.MustParseAddr("192.0.0.8")
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a.domains["example.com"] = append(a.domains["example.com"], addr)
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a.UpdateDomains([]string{"example.com"})
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a.Wait(ctx)
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if got, want := a.domains["example.com"], []netip.Addr{addr}; !slices.Equal(got, want) {
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t.Errorf("got %v; want %v", got, want)
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}
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// domains are explicitly downcased on set.
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a.UpdateDomains([]string{"UP.EXAMPLE.COM"})
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a.Wait(ctx)
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if got, want := xmaps.Keys(a.domains), []string{"up.example.com"}; !slices.Equal(got, want) {
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t.Errorf("got %v; want %v", got, want)
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}
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}
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}
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func TestUpdateRoutes(t *testing.T) {
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for _, shouldStore := range []bool{false, true} {
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ctx := context.Background()
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rc := &appctest.RouteCollector{}
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var a *AppConnector
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if shouldStore {
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a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
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} else {
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a = NewAppConnector(t.Logf, rc, nil, nil)
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}
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a.updateDomains([]string{"*.example.com"})
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// This route should be collapsed into the range
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a.ObserveDNSResponse(dnsResponse("a.example.com.", "192.0.2.1"))
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a.Wait(ctx)
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if !slices.Equal(rc.Routes(), []netip.Prefix{netip.MustParsePrefix("192.0.2.1/32")}) {
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t.Fatalf("got %v, want %v", rc.Routes(), []netip.Prefix{netip.MustParsePrefix("192.0.2.1/32")})
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}
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// This route should not be collapsed or removed
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a.ObserveDNSResponse(dnsResponse("b.example.com.", "192.0.0.1"))
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a.Wait(ctx)
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routes := []netip.Prefix{netip.MustParsePrefix("192.0.2.0/24"), netip.MustParsePrefix("192.0.0.1/32")}
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a.updateRoutes(routes)
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slices.SortFunc(rc.Routes(), prefixCompare)
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rc.SetRoutes(slices.Compact(rc.Routes()))
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slices.SortFunc(routes, prefixCompare)
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// Ensure that the non-matching /32 is preserved, even though it's in the domains table.
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if !slices.EqualFunc(routes, rc.Routes(), prefixEqual) {
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t.Errorf("added routes: got %v, want %v", rc.Routes(), routes)
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}
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// Ensure that the contained /32 is removed, replaced by the /24.
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wantRemoved := []netip.Prefix{netip.MustParsePrefix("192.0.2.1/32")}
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if !slices.EqualFunc(rc.RemovedRoutes(), wantRemoved, prefixEqual) {
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t.Fatalf("unexpected removed routes: %v", rc.RemovedRoutes())
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}
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}
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}
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func TestUpdateRoutesUnadvertisesContainedRoutes(t *testing.T) {
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for _, shouldStore := range []bool{false, true} {
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rc := &appctest.RouteCollector{}
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var a *AppConnector
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if shouldStore {
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a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
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} else {
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a = NewAppConnector(t.Logf, rc, nil, nil)
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}
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mak.Set(&a.domains, "example.com", []netip.Addr{netip.MustParseAddr("192.0.2.1")})
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rc.SetRoutes([]netip.Prefix{netip.MustParsePrefix("192.0.2.1/32")})
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routes := []netip.Prefix{netip.MustParsePrefix("192.0.2.0/24")}
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a.updateRoutes(routes)
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if !slices.EqualFunc(routes, rc.Routes(), prefixEqual) {
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t.Fatalf("got %v, want %v", rc.Routes(), routes)
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}
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}
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}
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func TestDomainRoutes(t *testing.T) {
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for _, shouldStore := range []bool{false, true} {
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rc := &appctest.RouteCollector{}
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var a *AppConnector
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if shouldStore {
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a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
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} else {
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a = NewAppConnector(t.Logf, rc, nil, nil)
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}
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a.updateDomains([]string{"example.com"})
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a.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
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a.Wait(context.Background())
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want := map[string][]netip.Addr{
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"example.com": {netip.MustParseAddr("192.0.0.8")},
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}
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if got := a.DomainRoutes(); !reflect.DeepEqual(got, want) {
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t.Fatalf("DomainRoutes: got %v, want %v", got, want)
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}
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}
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}
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func TestObserveDNSResponse(t *testing.T) {
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for _, shouldStore := range []bool{false, true} {
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ctx := context.Background()
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rc := &appctest.RouteCollector{}
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var a *AppConnector
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if shouldStore {
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a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
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} else {
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a = NewAppConnector(t.Logf, rc, nil, nil)
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}
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// a has no domains configured, so it should not advertise any routes
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a.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
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if got, want := rc.Routes(), ([]netip.Prefix)(nil); !slices.Equal(got, want) {
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t.Errorf("got %v; want %v", got, want)
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}
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wantRoutes := []netip.Prefix{netip.MustParsePrefix("192.0.0.8/32")}
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a.updateDomains([]string{"example.com"})
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a.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
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a.Wait(ctx)
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if got, want := rc.Routes(), wantRoutes; !slices.Equal(got, want) {
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t.Errorf("got %v; want %v", got, want)
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}
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// a CNAME record chain should result in a route being added if the chain
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// matches a routed domain.
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a.updateDomains([]string{"www.example.com", "example.com"})
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a.ObserveDNSResponse(dnsCNAMEResponse("192.0.0.9", "www.example.com.", "chain.example.com.", "example.com."))
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a.Wait(ctx)
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wantRoutes = append(wantRoutes, netip.MustParsePrefix("192.0.0.9/32"))
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if got, want := rc.Routes(), wantRoutes; !slices.Equal(got, want) {
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t.Errorf("got %v; want %v", got, want)
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}
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// a CNAME record chain should result in a route being added if the chain
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// even if only found in the middle of the chain
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a.ObserveDNSResponse(dnsCNAMEResponse("192.0.0.10", "outside.example.org.", "www.example.com.", "example.org."))
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a.Wait(ctx)
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wantRoutes = append(wantRoutes, netip.MustParsePrefix("192.0.0.10/32"))
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if got, want := rc.Routes(), wantRoutes; !slices.Equal(got, want) {
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t.Errorf("got %v; want %v", got, want)
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}
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wantRoutes = append(wantRoutes, netip.MustParsePrefix("2001:db8::1/128"))
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a.ObserveDNSResponse(dnsResponse("example.com.", "2001:db8::1"))
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a.Wait(ctx)
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if got, want := rc.Routes(), wantRoutes; !slices.Equal(got, want) {
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t.Errorf("got %v; want %v", got, want)
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}
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// don't re-advertise routes that have already been advertised
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a.ObserveDNSResponse(dnsResponse("example.com.", "2001:db8::1"))
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a.Wait(ctx)
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if !slices.Equal(rc.Routes(), wantRoutes) {
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t.Errorf("rc.Routes(): got %v; want %v", rc.Routes(), wantRoutes)
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}
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// don't advertise addresses that are already in a control provided route
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pfx := netip.MustParsePrefix("192.0.2.0/24")
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a.updateRoutes([]netip.Prefix{pfx})
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wantRoutes = append(wantRoutes, pfx)
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a.ObserveDNSResponse(dnsResponse("example.com.", "192.0.2.1"))
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a.Wait(ctx)
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if !slices.Equal(rc.Routes(), wantRoutes) {
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t.Errorf("rc.Routes(): got %v; want %v", rc.Routes(), wantRoutes)
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}
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if !slices.Contains(a.domains["example.com"], netip.MustParseAddr("192.0.2.1")) {
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t.Errorf("missing %v from %v", "192.0.2.1", a.domains["exmaple.com"])
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}
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}
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}
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func TestWildcardDomains(t *testing.T) {
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for _, shouldStore := range []bool{false, true} {
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ctx := context.Background()
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rc := &appctest.RouteCollector{}
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var a *AppConnector
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if shouldStore {
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a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
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} else {
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a = NewAppConnector(t.Logf, rc, nil, nil)
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}
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a.updateDomains([]string{"*.example.com"})
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a.ObserveDNSResponse(dnsResponse("foo.example.com.", "192.0.0.8"))
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a.Wait(ctx)
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if got, want := rc.Routes(), []netip.Prefix{netip.MustParsePrefix("192.0.0.8/32")}; !slices.Equal(got, want) {
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t.Errorf("routes: got %v; want %v", got, want)
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}
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if got, want := a.wildcards, []string{"example.com"}; !slices.Equal(got, want) {
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t.Errorf("wildcards: got %v; want %v", got, want)
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}
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a.updateDomains([]string{"*.example.com", "example.com"})
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if _, ok := a.domains["foo.example.com"]; !ok {
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t.Errorf("expected foo.example.com to be preserved in domains due to wildcard")
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}
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if got, want := a.wildcards, []string{"example.com"}; !slices.Equal(got, want) {
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t.Errorf("wildcards: got %v; want %v", got, want)
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}
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// There was an early regression where the wildcard domain was added repeatedly, this guards against that.
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a.updateDomains([]string{"*.example.com", "example.com"})
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if len(a.wildcards) != 1 {
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t.Errorf("expected only one wildcard domain, got %v", a.wildcards)
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}
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}
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}
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// dnsResponse is a test helper that creates a DNS response buffer for the given domain and address
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func dnsResponse(domain, address string) []byte {
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addr := netip.MustParseAddr(address)
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b := dnsmessage.NewBuilder(nil, dnsmessage.Header{})
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b.EnableCompression()
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b.StartAnswers()
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switch addr.BitLen() {
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case 32:
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b.AResource(
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dnsmessage.ResourceHeader{
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Name: dnsmessage.MustNewName(domain),
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Type: dnsmessage.TypeA,
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Class: dnsmessage.ClassINET,
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TTL: 0,
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},
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dnsmessage.AResource{
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A: addr.As4(),
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},
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)
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case 128:
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b.AAAAResource(
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dnsmessage.ResourceHeader{
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Name: dnsmessage.MustNewName(domain),
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Type: dnsmessage.TypeAAAA,
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Class: dnsmessage.ClassINET,
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TTL: 0,
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},
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dnsmessage.AAAAResource{
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AAAA: addr.As16(),
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},
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)
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default:
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panic("invalid address length")
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}
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return must.Get(b.Finish())
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}
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func dnsCNAMEResponse(address string, domains ...string) []byte {
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addr := netip.MustParseAddr(address)
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b := dnsmessage.NewBuilder(nil, dnsmessage.Header{})
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b.EnableCompression()
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b.StartAnswers()
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if len(domains) >= 2 {
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for i, domain := range domains[:len(domains)-1] {
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b.CNAMEResource(
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dnsmessage.ResourceHeader{
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Name: dnsmessage.MustNewName(domain),
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Type: dnsmessage.TypeCNAME,
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Class: dnsmessage.ClassINET,
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TTL: 0,
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},
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dnsmessage.CNAMEResource{
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CNAME: dnsmessage.MustNewName(domains[i+1]),
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},
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)
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}
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}
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domain := domains[len(domains)-1]
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switch addr.BitLen() {
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case 32:
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b.AResource(
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dnsmessage.ResourceHeader{
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Name: dnsmessage.MustNewName(domain),
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Type: dnsmessage.TypeA,
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Class: dnsmessage.ClassINET,
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TTL: 0,
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},
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dnsmessage.AResource{
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A: addr.As4(),
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},
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)
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case 128:
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b.AAAAResource(
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dnsmessage.ResourceHeader{
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Name: dnsmessage.MustNewName(domain),
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Type: dnsmessage.TypeAAAA,
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Class: dnsmessage.ClassINET,
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TTL: 0,
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},
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dnsmessage.AAAAResource{
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AAAA: addr.As16(),
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},
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)
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default:
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panic("invalid address length")
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}
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return must.Get(b.Finish())
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}
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func prefixEqual(a, b netip.Prefix) bool {
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return a == b
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}
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func prefixCompare(a, b netip.Prefix) int {
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if a.Addr().Compare(b.Addr()) == 0 {
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return a.Bits() - b.Bits()
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}
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return a.Addr().Compare(b.Addr())
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}
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func prefixes(in ...string) []netip.Prefix {
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toRet := make([]netip.Prefix, len(in))
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for i, s := range in {
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toRet[i] = netip.MustParsePrefix(s)
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}
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return toRet
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}
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func TestUpdateRouteRouteRemoval(t *testing.T) {
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for _, shouldStore := range []bool{false, true} {
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ctx := context.Background()
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rc := &appctest.RouteCollector{}
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assertRoutes := func(prefix string, routes, removedRoutes []netip.Prefix) {
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if !slices.Equal(routes, rc.Routes()) {
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t.Fatalf("%s: (shouldStore=%t) routes want %v, got %v", prefix, shouldStore, routes, rc.Routes())
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}
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if !slices.Equal(removedRoutes, rc.RemovedRoutes()) {
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t.Fatalf("%s: (shouldStore=%t) removedRoutes want %v, got %v", prefix, shouldStore, removedRoutes, rc.RemovedRoutes())
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}
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}
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var a *AppConnector
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if shouldStore {
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a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
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} else {
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a = NewAppConnector(t.Logf, rc, nil, nil)
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}
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// nothing has yet been advertised
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assertRoutes("appc init", []netip.Prefix{}, []netip.Prefix{})
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a.UpdateDomainsAndRoutes([]string{}, prefixes("1.2.3.1/32", "1.2.3.2/32"))
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a.Wait(ctx)
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// the routes passed to UpdateDomainsAndRoutes have been advertised
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assertRoutes("simple update", prefixes("1.2.3.1/32", "1.2.3.2/32"), []netip.Prefix{})
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// one route the same, one different
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a.UpdateDomainsAndRoutes([]string{}, prefixes("1.2.3.1/32", "1.2.3.3/32"))
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a.Wait(ctx)
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// old behavior: routes are not removed, resulting routes are both old and new
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// (we have dupe 1.2.3.1 routes because the test RouteAdvertiser doesn't have the deduplication
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// the real one does)
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wantRoutes := prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.1/32", "1.2.3.3/32")
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wantRemovedRoutes := []netip.Prefix{}
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if shouldStore {
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// new behavior: routes are removed, resulting routes are new only
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wantRoutes = prefixes("1.2.3.1/32", "1.2.3.1/32", "1.2.3.3/32")
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wantRemovedRoutes = prefixes("1.2.3.2/32")
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}
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assertRoutes("removal", wantRoutes, wantRemovedRoutes)
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}
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}
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func TestUpdateDomainRouteRemoval(t *testing.T) {
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for _, shouldStore := range []bool{false, true} {
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ctx := context.Background()
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rc := &appctest.RouteCollector{}
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assertRoutes := func(prefix string, routes, removedRoutes []netip.Prefix) {
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if !slices.Equal(routes, rc.Routes()) {
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t.Fatalf("%s: (shouldStore=%t) routes want %v, got %v", prefix, shouldStore, routes, rc.Routes())
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}
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if !slices.Equal(removedRoutes, rc.RemovedRoutes()) {
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t.Fatalf("%s: (shouldStore=%t) removedRoutes want %v, got %v", prefix, shouldStore, removedRoutes, rc.RemovedRoutes())
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}
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}
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var a *AppConnector
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if shouldStore {
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a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
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} else {
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a = NewAppConnector(t.Logf, rc, nil, nil)
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}
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assertRoutes("appc init", []netip.Prefix{}, []netip.Prefix{})
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a.UpdateDomainsAndRoutes([]string{"a.example.com", "b.example.com"}, []netip.Prefix{})
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a.Wait(ctx)
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// adding domains doesn't immediately cause any routes to be advertised
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assertRoutes("update domains", []netip.Prefix{}, []netip.Prefix{})
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a.ObserveDNSResponse(dnsResponse("a.example.com.", "1.2.3.1"))
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a.ObserveDNSResponse(dnsResponse("a.example.com.", "1.2.3.2"))
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a.ObserveDNSResponse(dnsResponse("b.example.com.", "1.2.3.3"))
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a.ObserveDNSResponse(dnsResponse("b.example.com.", "1.2.3.4"))
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a.Wait(ctx)
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// observing dns responses causes routes to be advertised
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assertRoutes("observed dns", prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.3/32", "1.2.3.4/32"), []netip.Prefix{})
|
|
|
|
a.UpdateDomainsAndRoutes([]string{"a.example.com"}, []netip.Prefix{})
|
|
a.Wait(ctx)
|
|
// old behavior, routes are not removed
|
|
wantRoutes := prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.3/32", "1.2.3.4/32")
|
|
wantRemovedRoutes := []netip.Prefix{}
|
|
if shouldStore {
|
|
// new behavior, routes are removed for b.example.com
|
|
wantRoutes = prefixes("1.2.3.1/32", "1.2.3.2/32")
|
|
wantRemovedRoutes = prefixes("1.2.3.3/32", "1.2.3.4/32")
|
|
}
|
|
assertRoutes("removal", wantRoutes, wantRemovedRoutes)
|
|
}
|
|
}
|
|
|
|
func TestUpdateWildcardRouteRemoval(t *testing.T) {
|
|
for _, shouldStore := range []bool{false, true} {
|
|
ctx := context.Background()
|
|
rc := &appctest.RouteCollector{}
|
|
|
|
assertRoutes := func(prefix string, routes, removedRoutes []netip.Prefix) {
|
|
if !slices.Equal(routes, rc.Routes()) {
|
|
t.Fatalf("%s: (shouldStore=%t) routes want %v, got %v", prefix, shouldStore, routes, rc.Routes())
|
|
}
|
|
if !slices.Equal(removedRoutes, rc.RemovedRoutes()) {
|
|
t.Fatalf("%s: (shouldStore=%t) removedRoutes want %v, got %v", prefix, shouldStore, removedRoutes, rc.RemovedRoutes())
|
|
}
|
|
}
|
|
|
|
var a *AppConnector
|
|
if shouldStore {
|
|
a = NewAppConnector(t.Logf, rc, &RouteInfo{}, fakeStoreRoutes)
|
|
} else {
|
|
a = NewAppConnector(t.Logf, rc, nil, nil)
|
|
}
|
|
assertRoutes("appc init", []netip.Prefix{}, []netip.Prefix{})
|
|
|
|
a.UpdateDomainsAndRoutes([]string{"a.example.com", "*.b.example.com"}, []netip.Prefix{})
|
|
a.Wait(ctx)
|
|
// adding domains doesn't immediately cause any routes to be advertised
|
|
assertRoutes("update domains", []netip.Prefix{}, []netip.Prefix{})
|
|
|
|
a.ObserveDNSResponse(dnsResponse("a.example.com.", "1.2.3.1"))
|
|
a.ObserveDNSResponse(dnsResponse("a.example.com.", "1.2.3.2"))
|
|
a.ObserveDNSResponse(dnsResponse("1.b.example.com.", "1.2.3.3"))
|
|
a.ObserveDNSResponse(dnsResponse("2.b.example.com.", "1.2.3.4"))
|
|
a.Wait(ctx)
|
|
// observing dns responses causes routes to be advertised
|
|
assertRoutes("observed dns", prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.3/32", "1.2.3.4/32"), []netip.Prefix{})
|
|
|
|
a.UpdateDomainsAndRoutes([]string{"a.example.com"}, []netip.Prefix{})
|
|
a.Wait(ctx)
|
|
// old behavior, routes are not removed
|
|
wantRoutes := prefixes("1.2.3.1/32", "1.2.3.2/32", "1.2.3.3/32", "1.2.3.4/32")
|
|
wantRemovedRoutes := []netip.Prefix{}
|
|
if shouldStore {
|
|
// new behavior, routes are removed for *.b.example.com
|
|
wantRoutes = prefixes("1.2.3.1/32", "1.2.3.2/32")
|
|
wantRemovedRoutes = prefixes("1.2.3.3/32", "1.2.3.4/32")
|
|
}
|
|
assertRoutes("removal", wantRoutes, wantRemovedRoutes)
|
|
}
|
|
}
|
|
|
|
func TestRoutesWithout(t *testing.T) {
|
|
assert := func(msg string, got, want []netip.Prefix) {
|
|
if !slices.Equal(want, got) {
|
|
t.Errorf("%s: want %v, got %v", msg, want, got)
|
|
}
|
|
}
|
|
|
|
assert("empty routes", routesWithout([]netip.Prefix{}, []netip.Prefix{}), []netip.Prefix{})
|
|
assert("a empty", routesWithout([]netip.Prefix{}, prefixes("1.1.1.1/32", "1.1.1.2/32")), []netip.Prefix{})
|
|
assert("b empty", routesWithout(prefixes("1.1.1.1/32", "1.1.1.2/32"), []netip.Prefix{}), prefixes("1.1.1.1/32", "1.1.1.2/32"))
|
|
assert("no overlap", routesWithout(prefixes("1.1.1.1/32", "1.1.1.2/32"), prefixes("1.1.1.3/32", "1.1.1.4/32")), prefixes("1.1.1.1/32", "1.1.1.2/32"))
|
|
assert("a has fewer", routesWithout(prefixes("1.1.1.1/32", "1.1.1.2/32"), prefixes("1.1.1.1/32", "1.1.1.2/32", "1.1.1.3/32", "1.1.1.4/32")), []netip.Prefix{})
|
|
assert("a has more", routesWithout(prefixes("1.1.1.1/32", "1.1.1.2/32", "1.1.1.3/32", "1.1.1.4/32"), prefixes("1.1.1.1/32", "1.1.1.3/32")), prefixes("1.1.1.2/32", "1.1.1.4/32"))
|
|
}
|