Merge 2fa7d1d836 into 71e9258ad9

Fixes tailscale/corp#19558

A request for the suggested exit nodes that occurs too early in the
VPN lifecycle would result in a null deref of the netmap and/or
the netcheck report.  This checks both and errors out.

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>

cmd/derper/depaware.txt

@@ -138,6 +138,7 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
         tailscale.com/types/structs                                  from tailscale.com/ipn+
         tailscale.com/types/tkatype                                  from tailscale.com/client/tailscale+
         tailscale.com/types/views                                    from tailscale.com/ipn+
+        tailscale.com/util/cibuild                                   from tailscale.com/health
         tailscale.com/util/clientmetric                              from tailscale.com/net/netmon+
         tailscale.com/util/cloudenv                                  from tailscale.com/hostinfo+
    W    tailscale.com/util/cmpver                                    from tailscale.com/net/tshttpproxy

cmd/k8s-operator/deploy/manifests/proxy.yaml

@@ -14,10 +14,8 @@ spec:
         - name: sysctler
           securityContext:
             privileged: true
-          command: ["/bin/sh"]
-          args:
-            - -c
-            - sysctl -w net.ipv4.ip_forward=1 net.ipv6.conf.all.forwarding=1
+          command: ["/bin/sh", "-c"]
+          args: [sysctl -w net.ipv4.ip_forward=1; if sysctl net.ipv6.conf.all.forwarding; then sysctl -w net.ipv6.conf.all.forwarding=1; fi]
       resources:
         requests:
           cpu: 1m

cmd/k8s-operator/testutils_test.go

@@ -189,8 +189,8 @@ func expectedSTS(t *testing.T, cl client.Client, opts configOpts) *appsv1.Statef
 						{
 							Name:    "sysctler",
 							Image:   "tailscale/tailscale",
-							Command: []string{"/bin/sh"},
-							Args:    []string{"-c", "sysctl -w net.ipv4.ip_forward=1 net.ipv6.conf.all.forwarding=1"},
+							Command: []string{"/bin/sh", "-c"},
+							Args:    []string{"sysctl -w net.ipv4.ip_forward=1; if sysctl net.ipv6.conf.all.forwarding; then sysctl -w net.ipv6.conf.all.forwarding=1; fi"},
 							SecurityContext: &corev1.SecurityContext{
 								Privileged: ptr.To(true),
 							},

cmd/tailscale/depaware.txt

@@ -142,6 +142,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         tailscale.com/types/structs                                  from tailscale.com/ipn+
         tailscale.com/types/tkatype                                  from tailscale.com/types/key+
         tailscale.com/types/views                                    from tailscale.com/tailcfg+
+        tailscale.com/util/cibuild                                   from tailscale.com/health
         tailscale.com/util/clientmetric                              from tailscale.com/net/netcheck+
         tailscale.com/util/cloudenv                                  from tailscale.com/net/dnscache+
         tailscale.com/util/cmpver                                    from tailscale.com/net/tshttpproxy+

cmd/tailscaled/depaware.txt

@@ -358,6 +358,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
         tailscale.com/types/tkatype                                  from tailscale.com/tka+
         tailscale.com/types/views                                    from tailscale.com/ipn/ipnlocal+
+        tailscale.com/util/cibuild                                   from tailscale.com/health
         tailscale.com/util/clientmetric                              from tailscale.com/control/controlclient+
         tailscale.com/util/cloudenv                                  from tailscale.com/net/dns/resolver+
         tailscale.com/util/cmpver                                    from tailscale.com/net/dns+

cmd/tailscaled/tailscaled.go

@@ -358,7 +358,7 @@ func run() (err error) {
 		sys.Set(netMon)
 	}
 
-	pol := logpolicy.New(logtail.CollectionNode, netMon, nil /* use log.Printf */)
+	pol := logpolicy.New(logtail.CollectionNode, netMon, sys.HealthTracker(), nil /* use log.Printf */)
 	pol.SetVerbosityLevel(args.verbose)
 	logPol = pol
 	defer func() {
@@ -651,6 +651,7 @@ func tryEngine(logf logger.Logf, sys *tsd.System, name string) (onlyNetstack boo
 	conf := wgengine.Config{
 		ListenPort:    args.port,
 		NetMon:        sys.NetMon.Get(),
+		HealthTracker: sys.HealthTracker(),
 		Dialer:        sys.Dialer.Get(),
 		SetSubsystem:  sys.Set,
 		ControlKnobs:  sys.ControlKnobs(),
@@ -676,7 +677,7 @@ func tryEngine(logf logger.Logf, sys *tsd.System, name string) (onlyNetstack boo
 			// configuration being unavailable (from the noop
 			// manager). More in Issue 4017.
 			// TODO(bradfitz): add a Synology-specific DNS manager.
-			conf.DNS, err = dns.NewOSConfigurator(logf, "") // empty interface name
+			conf.DNS, err = dns.NewOSConfigurator(logf, sys.HealthTracker(), "") // empty interface name
 			if err != nil {
 				return false, fmt.Errorf("dns.NewOSConfigurator: %w", err)
 			}
@@ -698,13 +699,13 @@ func tryEngine(logf logger.Logf, sys *tsd.System, name string) (onlyNetstack boo
 			return false, err
 		}
 
-		r, err := router.New(logf, dev, sys.NetMon.Get())
+		r, err := router.New(logf, dev, sys.NetMon.Get(), sys.HealthTracker())
 		if err != nil {
 			dev.Close()
 			return false, fmt.Errorf("creating router: %w", err)
 		}
 
-		d, err := dns.NewOSConfigurator(logf, devName)
+		d, err := dns.NewOSConfigurator(logf, sys.HealthTracker(), devName)
 		if err != nil {
 			dev.Close()
 			r.Close()

cmd/tsconnect/wasm/wasm_js.go

@@ -104,9 +104,10 @@ func newIPN(jsConfig js.Value) map[string]any {
 	sys.Set(store)
 	dialer := &tsdial.Dialer{Logf: logf}
 	eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
-		Dialer:       dialer,
-		SetSubsystem: sys.Set,
-		ControlKnobs: sys.ControlKnobs(),
+		Dialer:        dialer,
+		SetSubsystem:  sys.Set,
+		ControlKnobs:  sys.ControlKnobs(),
+		HealthTracker: sys.HealthTracker(),
 	})
 	if err != nil {
 		log.Fatal(err)

control/controlclient/auto.go

@@ -12,7 +12,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"tailscale.com/health"
 	"tailscale.com/logtail/backoff"
 	"tailscale.com/net/sockstats"
 	"tailscale.com/tailcfg"
@@ -195,7 +194,7 @@ func NewNoStart(opts Options) (_ *Auto, err error) {
 	c.mapCtx, c.mapCancel = context.WithCancel(context.Background())
 	c.mapCtx = sockstats.WithSockStats(c.mapCtx, sockstats.LabelControlClientAuto, opts.Logf)
 
-	c.unregisterHealthWatch = health.Global.RegisterWatcher(direct.ReportHealthChange)
+	c.unregisterHealthWatch = opts.HealthTracker.RegisterWatcher(direct.ReportHealthChange)
 	return c, nil
 
 }
@@ -316,7 +315,7 @@ func (c *Auto) authRoutine() {
 		}
 
 		if goal == nil {
-			health.Global.SetAuthRoutineInError(nil)
+			c.direct.health.SetAuthRoutineInError(nil)
 			// Wait for user to Login or Logout.
 			<-ctx.Done()
 			c.logf("[v1] authRoutine: context done.")
@@ -343,7 +342,7 @@ func (c *Auto) authRoutine() {
 			f = "TryLogin"
 		}
 		if err != nil {
-			health.Global.SetAuthRoutineInError(err)
+			c.direct.health.SetAuthRoutineInError(err)
 			report(err, f)
 			bo.BackOff(ctx, err)
 			continue
@@ -373,7 +372,7 @@ func (c *Auto) authRoutine() {
 		}
 
 		// success
-		health.Global.SetAuthRoutineInError(nil)
+		c.direct.health.SetAuthRoutineInError(nil)
 		c.mu.Lock()
 		c.urlToVisit = ""
 		c.loggedIn = true
@@ -503,11 +502,11 @@ func (c *Auto) mapRoutine() {
 			c.logf("[v1] mapRoutine: context done.")
 			continue
 		}
-		health.Global.SetOutOfPollNetMap()
+		c.direct.health.SetOutOfPollNetMap()
 
 		err := c.direct.PollNetMap(ctx, mrs)
 
-		health.Global.SetOutOfPollNetMap()
+		c.direct.health.SetOutOfPollNetMap()
 		c.mu.Lock()
 		c.inMapPoll = false
 		if c.state == StateSynchronized {

control/controlclient/direct.go

@@ -69,6 +69,7 @@ type Direct struct {
 	clock                      tstime.Clock
 	logf                       logger.Logf
 	netMon                     *netmon.Monitor // or nil
+	health                     *health.Tracker
 	discoPubKey                key.DiscoPublic
 	getMachinePrivKey          func() (key.MachinePrivate, error)
 	debugFlags                 []string
@@ -119,10 +120,11 @@ type Options struct {
 	Hostinfo                   *tailcfg.Hostinfo // non-nil passes ownership, nil means to use default using os.Hostname, etc
 	DiscoPublicKey             key.DiscoPublic
 	Logf                       logger.Logf
-	HTTPTestClient             *http.Client                 // optional HTTP client to use (for tests only)
-	NoiseTestClient            *http.Client                 // optional HTTP client to use for noise RPCs (tests only)
-	DebugFlags                 []string                     // debug settings to send to control
-	NetMon                     *netmon.Monitor              // optional network monitor
+	HTTPTestClient             *http.Client    // optional HTTP client to use (for tests only)
+	NoiseTestClient            *http.Client    // optional HTTP client to use for noise RPCs (tests only)
+	DebugFlags                 []string        // debug settings to send to control
+	NetMon                     *netmon.Monitor // optional network monitor
+	HealthTracker              *health.Tracker
 	PopBrowserURL              func(url string)             // optional func to open browser
 	OnClientVersion            func(*tailcfg.ClientVersion) // optional func to inform GUI of client version status
 	OnControlTime              func(time.Time)              // optional func to notify callers of new time from control
@@ -248,7 +250,7 @@ func NewDirect(opts Options) (*Direct, error) {
 		tr := http.DefaultTransport.(*http.Transport).Clone()
 		tr.Proxy = tshttpproxy.ProxyFromEnvironment
 		tshttpproxy.SetTransportGetProxyConnectHeader(tr)
-		tr.TLSClientConfig = tlsdial.Config(serverURL.Hostname(), health.Global, tr.TLSClientConfig)
+		tr.TLSClientConfig = tlsdial.Config(serverURL.Hostname(), opts.HealthTracker, tr.TLSClientConfig)
 		tr.DialContext = dnscache.Dialer(opts.Dialer.SystemDial, dnsCache)
 		tr.DialTLSContext = dnscache.TLSDialer(opts.Dialer.SystemDial, dnsCache, tr.TLSClientConfig)
 		tr.ForceAttemptHTTP2 = true
@@ -271,6 +273,7 @@ func NewDirect(opts Options) (*Direct, error) {
 		discoPubKey:                opts.DiscoPublicKey,
 		debugFlags:                 opts.DebugFlags,
 		netMon:                     opts.NetMon,
+		health:                     opts.HealthTracker,
 		skipIPForwardingCheck:      opts.SkipIPForwardingCheck,
 		pinger:                     opts.Pinger,
 		popBrowser:                 opts.PopBrowserURL,
@@ -894,10 +897,10 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
 		ipForwardingBroken(hi.RoutableIPs, c.netMon.InterfaceState()) {
 		extraDebugFlags = append(extraDebugFlags, "warn-ip-forwarding-off")
 	}
-	if health.Global.RouterHealth() != nil {
+	if c.health.RouterHealth() != nil {
 		extraDebugFlags = append(extraDebugFlags, "warn-router-unhealthy")
 	}
-	extraDebugFlags = health.Global.AppendWarnableDebugFlags(extraDebugFlags)
+	extraDebugFlags = c.health.AppendWarnableDebugFlags(extraDebugFlags)
 	if hostinfo.DisabledEtcAptSource() {
 		extraDebugFlags = append(extraDebugFlags, "warn-etc-apt-source-disabled")
 	}
@@ -970,7 +973,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
 	}
 	defer res.Body.Close()
 
-	health.Global.NoteMapRequestHeard(request)
+	c.health.NoteMapRequestHeard(request)
 	watchdogTimer.Reset(watchdogTimeout)
 
 	if nu == nil {
@@ -1041,7 +1044,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
 		metricMapResponseMessages.Add(1)
 
 		if isStreaming {
-			health.Global.GotStreamedMapResponse()
+			c.health.GotStreamedMapResponse()
 		}
 
 		if pr := resp.PingRequest; pr != nil && c.isUniquePingRequest(pr) {
@@ -1450,14 +1453,15 @@ func (c *Direct) getNoiseClient() (*NoiseClient, error) {
 		}
 		c.logf("[v1] creating new noise client")
 		nc, err := NewNoiseClient(NoiseOpts{
-			PrivKey:      k,
-			ServerPubKey: serverNoiseKey,
-			ServerURL:    c.serverURL,
-			Dialer:       c.dialer,
-			DNSCache:     c.dnsCache,
-			Logf:         c.logf,
-			NetMon:       c.netMon,
-			DialPlan:     dp,
+			PrivKey:       k,
+			ServerPubKey:  serverNoiseKey,
+			ServerURL:     c.serverURL,
+			Dialer:        c.dialer,
+			DNSCache:      c.dnsCache,
+			Logf:          c.logf,
+			NetMon:        c.netMon,
+			HealthTracker: c.health,
+			DialPlan:      dp,
 		})
 		if err != nil {
 			return nil, err

control/controlclient/noise.go

@@ -19,6 +19,7 @@ import (
 	"golang.org/x/net/http2"
 	"tailscale.com/control/controlbase"
 	"tailscale.com/control/controlhttp"
+	"tailscale.com/health"
 	"tailscale.com/net/dnscache"
 	"tailscale.com/net/netmon"
 	"tailscale.com/net/tsdial"
@@ -174,6 +175,7 @@ type NoiseClient struct {
 
 	logf   logger.Logf
 	netMon *netmon.Monitor
+	health *health.Tracker
 
 	// mu only protects the following variables.
 	mu       sync.Mutex
@@ -204,6 +206,8 @@ type NoiseOpts struct {
 	// network interface state. This field can be nil; if so, the current
 	// state will be looked up dynamically.
 	NetMon *netmon.Monitor
+	// HealthTracker, if non-nil, is the health tracker to use.
+	HealthTracker *health.Tracker
 	// DialPlan, if set, is a function that should return an explicit plan
 	// on how to connect to the server.
 	DialPlan func() *tailcfg.ControlDialPlan
@@ -247,6 +251,7 @@ func NewNoiseClient(opts NoiseOpts) (*NoiseClient, error) {
 		dialPlan:     opts.DialPlan,
 		logf:         opts.Logf,
 		netMon:       opts.NetMon,
+		health:       opts.HealthTracker,
 	}
 
 	// Create the HTTP/2 Transport using a net/http.Transport
@@ -453,6 +458,7 @@ func (nc *NoiseClient) dial(ctx context.Context) (*noiseConn, error) {
 		DialPlan:        dialPlan,
 		Logf:            nc.logf,
 		NetMon:          nc.netMon,
+		HealthTracker:   nc.health,
 		Clock:           tstime.StdClock{},
 	}).Dial(ctx)
 	if err != nil {

control/controlhttp/client.go

@@ -38,7 +38,6 @@ import (
 
 	"tailscale.com/control/controlbase"
 	"tailscale.com/envknob"
-	"tailscale.com/health"
 	"tailscale.com/net/dnscache"
 	"tailscale.com/net/dnsfallback"
 	"tailscale.com/net/netutil"
@@ -434,7 +433,7 @@ func (a *Dialer) tryURLUpgrade(ctx context.Context, u *url.URL, addr netip.Addr,
 	// Disable HTTP2, since h2 can't do protocol switching.
 	tr.TLSClientConfig.NextProtos = []string{}
 	tr.TLSNextProto = map[string]func(string, *tls.Conn) http.RoundTripper{}
-	tr.TLSClientConfig = tlsdial.Config(a.Hostname, health.Global, tr.TLSClientConfig)
+	tr.TLSClientConfig = tlsdial.Config(a.Hostname, a.HealthTracker, tr.TLSClientConfig)
 	if !tr.TLSClientConfig.InsecureSkipVerify {
 		panic("unexpected") // should be set by tlsdial.Config
 	}

control/controlhttp/constants.go

@@ -8,6 +8,7 @@ import (
 	"net/url"
 	"time"
 
+	"tailscale.com/health"
 	"tailscale.com/net/dnscache"
 	"tailscale.com/net/netmon"
 	"tailscale.com/tailcfg"
@@ -79,6 +80,9 @@ type Dialer struct {
 
 	NetMon *netmon.Monitor
 
+	// HealthTracker, if non-nil, is the health tracker to use.
+	HealthTracker *health.Tracker
+
 	// DialPlan, if set, contains instructions from the control server on
 	// how to connect to it. If present, we will try the methods in this
 	// plan before falling back to DNS.

health/health.go

@@ -9,6 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
+	"os"
 	"runtime"
 	"sort"
 	"sync"
@@ -18,6 +19,7 @@ import (
 	"tailscale.com/envknob"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/opt"
+	"tailscale.com/util/cibuild"
 	"tailscale.com/util/mak"
 	"tailscale.com/util/multierr"
 	"tailscale.com/util/set"
@@ -28,15 +30,9 @@ var (
 	debugHandler map[string]http.Handler
 )
 
-// Global is a global health tracker for the process.
-//
-// TODO(bradfitz): finish moving all reference to this plumb it (ultimately out
-// from tsd.System) so a process can have multiple tsnet/etc instances with
-// their own health trackers. But for now (2024-04-25), the tsd.System value
-// given out is just this one, until that's the only remaining Global reference
-// remaining.
-var Global = new(Tracker)
-
+// Tracker tracks the health of various Tailscale subsystems,
+// comparing each subsystems' state with each other to make sure
+// they're consistent based on the user's intended state.
 type Tracker struct {
 	// mu guards everything in this var block.
 	mu sync.Mutex
@@ -152,6 +148,11 @@ func (t *Tracker) nil() bool {
 	if t != nil {
 		return false
 	}
+	if cibuild.On() {
+		stack := make([]byte, 1<<10)
+		stack = stack[:runtime.Stack(stack, false)]
+		fmt.Fprintf(os.Stderr, "## WARNING: (non-fatal) nil health.Tracker (being strict in CI):\n%s\n", stack)
+	}
 	// TODO(bradfitz): open source our "unexpected" package
 	// and use it here to capture samples of stacks where
 	// t is nil.

ipn/ipnlocal/local.go

@@ -327,6 +327,16 @@ type LocalBackend struct {
 	outgoingFiles map[string]*ipn.OutgoingFile
 }
 
+// HealthTracker returns the health tracker for the backend.
+func (b *LocalBackend) HealthTracker() *health.Tracker {
+	return b.health
+}
+
+// NetMon returns the network monitor for the backend.
+func (b *LocalBackend) NetMon() *netmon.Monitor {
+	return b.sys.NetMon.Get()
+}
+
 type updateStatus struct {
 	started bool
 }
@@ -405,7 +415,7 @@ func NewLocalBackend(logf logger.Logf, logID logid.PublicID, sys *tsd.System, lo
 	}
 
 	netMon := sys.NetMon.Get()
-	b.sockstatLogger, err = sockstatlog.NewLogger(logpolicy.LogsDir(logf), logf, logID, netMon)
+	b.sockstatLogger, err = sockstatlog.NewLogger(logpolicy.LogsDir(logf), logf, logID, netMon, sys.HealthTracker())
 	if err != nil {
 		log.Printf("error setting up sockstat logger: %v", err)
 	}
@@ -1753,6 +1763,7 @@ func (b *LocalBackend) Start(opts ipn.Options) error {
 		DiscoPublicKey:             discoPublic,
 		DebugFlags:                 debugFlags,
 		NetMon:                     b.sys.NetMon.Get(),
+		HealthTracker:              b.health,
 		Pinger:                     b,
 		PopBrowserURL:              b.tellClientToBrowseToURL,
 		OnClientVersion:            b.onClientVersion,
@@ -6242,6 +6253,7 @@ func mayDeref[T any](p *T) (v T) {
 }
 
 var ErrNoPreferredDERP = errors.New("no preferred DERP, try again later")
+var ErrCannotSuggestExitNode = errors.New("unable to suggest an exit node, try again later")
 
 // SuggestExitNode computes a suggestion based on the current netmap and last netcheck report. If
 // there are multiple equally good options, one is selected at random, so the result is not stable. To be
@@ -6255,6 +6267,9 @@ func (b *LocalBackend) SuggestExitNode() (response apitype.ExitNodeSuggestionRes
 	lastReport := b.MagicConn().GetLastNetcheckReport(b.ctx)
 	netMap := b.netMap
 	b.mu.Unlock()
+	if lastReport == nil || netMap == nil {
+		return response, ErrCannotSuggestExitNode
+	}
 	seed := time.Now().UnixNano()
 	r := rand.New(rand.NewSource(seed))
 	return suggestExitNode(lastReport, netMap, r)

ipn/ipnlocal/network-lock.go

@@ -20,7 +20,6 @@ import (
 	"path/filepath"
 	"time"
 
-	"tailscale.com/health"
 	"tailscale.com/health/healthmsg"
 	"tailscale.com/ipn"
 	"tailscale.com/ipn/ipnstate"
@@ -59,11 +58,11 @@ type tkaState struct {
 // b.mu must be held.
 func (b *LocalBackend) tkaFilterNetmapLocked(nm *netmap.NetworkMap) {
 	if b.tka == nil && !b.capTailnetLock {
-		health.Global.SetTKAHealth(nil)
+		b.health.SetTKAHealth(nil)
 		return
 	}
 	if b.tka == nil {
-		health.Global.SetTKAHealth(nil)
+		b.health.SetTKAHealth(nil)
 		return // TKA not enabled.
 	}
 
@@ -117,9 +116,9 @@ func (b *LocalBackend) tkaFilterNetmapLocked(nm *netmap.NetworkMap) {
 
 	// Check that we ourselves are not locked out, report a health issue if so.
 	if nm.SelfNode.Valid() && b.tka.authority.NodeKeyAuthorized(nm.SelfNode.Key(), nm.SelfNode.KeySignature().AsSlice()) != nil {
-		health.Global.SetTKAHealth(errors.New(healthmsg.LockedOut))
+		b.health.SetTKAHealth(errors.New(healthmsg.LockedOut))
 	} else {
-		health.Global.SetTKAHealth(nil)
+		b.health.SetTKAHealth(nil)
 	}
 }
 
@@ -188,7 +187,7 @@ func (b *LocalBackend) tkaSyncIfNeeded(nm *netmap.NetworkMap, prefs ipn.PrefsVie
 				b.logf("Disablement failed, leaving TKA enabled. Error: %v", err)
 			} else {
 				isEnabled = false
-				health.Global.SetTKAHealth(nil)
+				b.health.SetTKAHealth(nil)
 			}
 		} else {
 			return fmt.Errorf("[bug] unreachable invariant of wantEnabled w/ isEnabled")

ipn/ipnserver/server.go

@@ -199,7 +199,7 @@ func (s *Server) serveHTTP(w http.ResponseWriter, r *http.Request) {
 	defer onDone()
 
 	if strings.HasPrefix(r.URL.Path, "/localapi/") {
-		lah := localapi.NewHandler(lb, s.logf, s.netMon, s.backendLogID)
+		lah := localapi.NewHandler(lb, s.logf, s.backendLogID)
 		lah.PermitRead, lah.PermitWrite = s.localAPIPermissions(ci)
 		lah.PermitCert = s.connCanFetchCerts(ci)
 		lah.ConnIdentity = ci

ipn/localapi/debugderp.go

@@ -140,7 +140,7 @@ func (h *Handler) serveDebugDERPRegion(w http.ResponseWriter, r *http.Request) {
 	}
 
 	checkSTUN4 := func(derpNode *tailcfg.DERPNode) {
-		u4, err := nettype.MakePacketListenerWithNetIP(netns.Listener(h.logf, h.netMon)).ListenPacket(ctx, "udp4", ":0")
+		u4, err := nettype.MakePacketListenerWithNetIP(netns.Listener(h.logf, h.b.NetMon())).ListenPacket(ctx, "udp4", ":0")
 		if err != nil {
 			st.Errors = append(st.Errors, fmt.Sprintf("Error creating IPv4 STUN listener: %v", err))
 			return
@@ -249,7 +249,7 @@ func (h *Handler) serveDebugDERPRegion(w http.ResponseWriter, r *http.Request) {
 		serverPubKeys := make(map[key.NodePublic]bool)
 		for i := range 5 {
 			func() {
-				rc := derphttp.NewRegionClient(fakePrivKey, h.logf, h.netMon, func() *tailcfg.DERPRegion {
+				rc := derphttp.NewRegionClient(fakePrivKey, h.logf, h.b.NetMon(), func() *tailcfg.DERPRegion {
 					return &tailcfg.DERPRegion{
 						RegionID:   reg.RegionID,
 						RegionCode: reg.RegionCode,

ipn/localapi/localapi.go

@@ -36,7 +36,6 @@ import (
 	"tailscale.com/clientupdate"
 	"tailscale.com/drive"
 	"tailscale.com/envknob"
-	"tailscale.com/health"
 	"tailscale.com/hostinfo"
 	"tailscale.com/ipn"
 	"tailscale.com/ipn/ipnauth"
@@ -156,8 +155,8 @@ var (
 
 // NewHandler creates a new LocalAPI HTTP handler. All parameters except netMon
 // are required (if non-nil it's used to do faster interface lookups).
-func NewHandler(b *ipnlocal.LocalBackend, logf logger.Logf, netMon *netmon.Monitor, logID logid.PublicID) *Handler {
-	return &Handler{b: b, logf: logf, netMon: netMon, backendLogID: logID, clock: tstime.StdClock{}}
+func NewHandler(b *ipnlocal.LocalBackend, logf logger.Logf, logID logid.PublicID) *Handler {
+	return &Handler{b: b, logf: logf, backendLogID: logID, clock: tstime.StdClock{}}
 }
 
 type Handler struct {
@@ -188,7 +187,6 @@ type Handler struct {
 
 	b            *ipnlocal.LocalBackend
 	logf         logger.Logf
-	netMon       *netmon.Monitor // optional; nil means interfaces will be looked up on-demand
 	backendLogID logid.PublicID
 	clock        tstime.Clock
 }
@@ -358,7 +356,7 @@ func (h *Handler) serveBugReport(w http.ResponseWriter, r *http.Request) {
 	}
 	hi, _ := json.Marshal(hostinfo.New())
 	h.logf("user bugreport hostinfo: %s", hi)
-	if err := health.Global.OverallError(); err != nil {
+	if err := h.b.HealthTracker().OverallError(); err != nil {
 		h.logf("user bugreport health: %s", err.Error())
 	} else {
 		h.logf("user bugreport health: ok")
@@ -748,7 +746,7 @@ func (h *Handler) serveDebugPortmap(w http.ResponseWriter, r *http.Request) {
 	done := make(chan bool, 1)
 
 	var c *portmapper.Client
-	c = portmapper.NewClient(logger.WithPrefix(logf, "portmapper: "), h.netMon, debugKnobs, h.b.ControlKnobs(), func() {
+	c = portmapper.NewClient(logger.WithPrefix(logf, "portmapper: "), h.b.NetMon(), debugKnobs, h.b.ControlKnobs(), func() {
 		logf("portmapping changed.")
 		logf("have mapping: %v", c.HaveMapping())
 

log/sockstatlog/logger.go

@@ -17,6 +17,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"tailscale.com/health"
 	"tailscale.com/logpolicy"
 	"tailscale.com/logtail"
 	"tailscale.com/logtail/filch"
@@ -93,7 +94,7 @@ func SockstatLogID(logID logid.PublicID) logid.PrivateID {
 // The returned Logger is not yet enabled, and must be shut down with Shutdown when it is no longer needed.
 // Logs will be uploaded to the log server using a new log ID derived from the provided backend logID.
 // The netMon parameter is optional; if non-nil it's used to do faster interface lookups.
-func NewLogger(logdir string, logf logger.Logf, logID logid.PublicID, netMon *netmon.Monitor) (*Logger, error) {
+func NewLogger(logdir string, logf logger.Logf, logID logid.PublicID, netMon *netmon.Monitor, health *health.Tracker) (*Logger, error) {
 	if !sockstats.IsAvailable {
 		return nil, nil
 	}
@@ -113,7 +114,7 @@ func NewLogger(logdir string, logf logger.Logf, logID logid.PublicID, netMon *ne
 	logger := &Logger{
 		logf:  logf,
 		filch: filch,
-		tr:    logpolicy.NewLogtailTransport(logtail.DefaultHost, netMon, logf),
+		tr:    logpolicy.NewLogtailTransport(logtail.DefaultHost, netMon, health, logf),
 	}
 	logger.logger = logtail.NewLogger(logtail.Config{
 		BaseURL:      logpolicy.LogURL(),

log/sockstatlog/logger_test.go

@@ -23,7 +23,7 @@ func TestResourceCleanup(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	lg, err := NewLogger(td, logger.Discard, id.Public(), nil)
+	lg, err := NewLogger(td, logger.Discard, id.Public(), nil, nil)
 	if err != nil {
 		t.Fatal(err)
 	}

logpolicy/logpolicy.go

@@ -453,13 +453,13 @@ func tryFixLogStateLocation(dir, cmdname string, logf logger.Logf) {
 // The logf parameter is optional; if non-nil, information logs (e.g. when
 // migrating state) are sent to that logger, and global changes to the log
 // package are avoided. If nil, logs will be printed using log.Printf.
-func New(collection string, netMon *netmon.Monitor, logf logger.Logf) *Policy {
-	return NewWithConfigPath(collection, "", "", netMon, logf)
+func New(collection string, netMon *netmon.Monitor, health *health.Tracker, logf logger.Logf) *Policy {
+	return NewWithConfigPath(collection, "", "", netMon, health, logf)
 }
 
 // NewWithConfigPath is identical to New, but uses the specified directory and
 // command name. If either is empty, it derives them automatically.
-func NewWithConfigPath(collection, dir, cmdName string, netMon *netmon.Monitor, logf logger.Logf) *Policy {
+func NewWithConfigPath(collection, dir, cmdName string, netMon *netmon.Monitor, health *health.Tracker, logf logger.Logf) *Policy {
 	var lflags int
 	if term.IsTerminal(2) || runtime.GOOS == "windows" {
 		lflags = 0
@@ -555,7 +555,7 @@ func NewWithConfigPath(collection, dir, cmdName string, netMon *netmon.Monitor,
 		PrivateID:    newc.PrivateID,
 		Stderr:       logWriter{console},
 		CompressLogs: true,
-		HTTPC:        &http.Client{Transport: NewLogtailTransport(logtail.DefaultHost, netMon, logf)},
+		HTTPC:        &http.Client{Transport: NewLogtailTransport(logtail.DefaultHost, netMon, health, logf)},
 	}
 	if collection == logtail.CollectionNode {
 		conf.MetricsDelta = clientmetric.EncodeLogTailMetricsDelta
@@ -570,7 +570,7 @@ func NewWithConfigPath(collection, dir, cmdName string, netMon *netmon.Monitor,
 		logf("You have enabled a non-default log target. Doing without being told to by Tailscale staff or your network administrator will make getting support difficult.")
 		conf.BaseURL = val
 		u, _ := url.Parse(val)
-		conf.HTTPC = &http.Client{Transport: NewLogtailTransport(u.Host, netMon, logf)}
+		conf.HTTPC = &http.Client{Transport: NewLogtailTransport(u.Host, netMon, health, logf)}
 	}
 
 	filchOptions := filch.Options{
@@ -742,7 +742,7 @@ func dialContext(ctx context.Context, netw, addr string, netMon *netmon.Monitor,
 //
 // The logf parameter is optional; if non-nil, logs are printed using the
 // provided function; if nil, log.Printf will be used instead.
-func NewLogtailTransport(host string, netMon *netmon.Monitor, logf logger.Logf) http.RoundTripper {
+func NewLogtailTransport(host string, netMon *netmon.Monitor, health *health.Tracker, logf logger.Logf) http.RoundTripper {
 	if testenv.InTest() {
 		return noopPretendSuccessTransport{}
 	}
@@ -783,7 +783,7 @@ func NewLogtailTransport(host string, netMon *netmon.Monitor, logf logger.Logf)
 		tr.TLSNextProto = map[string]func(authority string, c *tls.Conn) http.RoundTripper{}
 	}
 
-	tr.TLSClientConfig = tlsdial.Config(host, health.Global, tr.TLSClientConfig)
+	tr.TLSClientConfig = tlsdial.Config(host, health, tr.TLSClientConfig)
 
 	return tr
 }

net/dns/direct.go

@@ -21,6 +21,7 @@ import (
 	"sync"
 	"time"
 
+	"tailscale.com/health"
 	"tailscale.com/net/dns/resolvconffile"
 	"tailscale.com/net/tsaddr"
 	"tailscale.com/types/logger"
@@ -116,8 +117,9 @@ func restartResolved() error {
 // The caller must call Down before program shutdown
 // or as cleanup if the program terminates unexpectedly.
 type directManager struct {
-	logf logger.Logf
-	fs   wholeFileFS
+	logf   logger.Logf
+	health *health.Tracker
+	fs     wholeFileFS
 	// renameBroken is set if fs.Rename to or from /etc/resolv.conf
 	// fails. This can happen in some container runtimes, where
 	// /etc/resolv.conf is bind-mounted from outside the container,
@@ -140,14 +142,15 @@ type directManager struct {
 }
 
 //lint:ignore U1000 used in manager_{freebsd,openbsd}.go
-func newDirectManager(logf logger.Logf) *directManager {
-	return newDirectManagerOnFS(logf, directFS{})
+func newDirectManager(logf logger.Logf, health *health.Tracker) *directManager {
+	return newDirectManagerOnFS(logf, health, directFS{})
 }
 
-func newDirectManagerOnFS(logf logger.Logf, fs wholeFileFS) *directManager {
+func newDirectManagerOnFS(logf logger.Logf, health *health.Tracker, fs wholeFileFS) *directManager {
 	ctx, cancel := context.WithCancel(context.Background())
 	m := &directManager{
 		logf:     logf,
+		health:   health,
 		fs:       fs,
 		ctx:      ctx,
 		ctxClose: cancel,

net/dns/direct_linux.go

@@ -78,7 +78,7 @@ func (m *directManager) checkForFileTrample() {
 		return
 	}
 	if bytes.Equal(cur, want) {
-		health.Global.SetWarnable(warnTrample, nil)
+		m.health.SetWarnable(warnTrample, nil)
 		if lastWarn != nil {
 			m.mu.Lock()
 			m.lastWarnContents = nil
@@ -101,7 +101,7 @@ func (m *directManager) checkForFileTrample() {
 		show = show[:1024]
 	}
 	m.logf("trample: resolv.conf changed from what we expected. did some other program interfere? current contents: %q", show)
-	health.Global.SetWarnable(warnTrample, errors.New("Linux DNS config not ideal. /etc/resolv.conf overwritten. See https://tailscale.com/s/dns-fight"))
+	m.health.SetWarnable(warnTrample, errors.New("Linux DNS config not ideal. /etc/resolv.conf overwritten. See https://tailscale.com/s/dns-fight"))
 }
 
 func (m *directManager) closeInotifyOnDone(ctx context.Context, in *gonotify.Inotify) {

net/dns/manager.go

@@ -42,7 +42,8 @@ const maxActiveQueries = 256
 
 // Manager manages system DNS settings.
 type Manager struct {
-	logf logger.Logf
+	logf   logger.Logf
+	health *health.Tracker
 
 	activeQueriesAtomic int32
 
@@ -55,7 +56,7 @@ type Manager struct {
 
 // NewManagers created a new manager from the given config.
 // The netMon parameter is optional; if non-nil it's used to do faster interface lookups.
-func NewManager(logf logger.Logf, oscfg OSConfigurator, netMon *netmon.Monitor, dialer *tsdial.Dialer, linkSel resolver.ForwardLinkSelector, knobs *controlknobs.Knobs) *Manager {
+func NewManager(logf logger.Logf, oscfg OSConfigurator, netMon *netmon.Monitor, health *health.Tracker, dialer *tsdial.Dialer, linkSel resolver.ForwardLinkSelector, knobs *controlknobs.Knobs) *Manager {
 	if dialer == nil {
 		panic("nil Dialer")
 	}
@@ -64,6 +65,7 @@ func NewManager(logf logger.Logf, oscfg OSConfigurator, netMon *netmon.Monitor,
 		logf:     logf,
 		resolver: resolver.New(logf, netMon, linkSel, dialer, knobs),
 		os:       oscfg,
+		health:   health,
 	}
 	m.ctx, m.ctxCancel = context.WithCancel(context.Background())
 	m.logf("using %T", m.os)
@@ -94,10 +96,10 @@ func (m *Manager) Set(cfg Config) error {
 		return err
 	}
 	if err := m.os.SetDNS(ocfg); err != nil {
-		health.Global.SetDNSOSHealth(err)
+		m.health.SetDNSOSHealth(err)
 		return err
 	}
-	health.Global.SetDNSOSHealth(nil)
+	m.health.SetDNSOSHealth(nil)
 
 	return nil
 }
@@ -248,7 +250,7 @@ func (m *Manager) compileConfig(cfg Config) (rcfg resolver.Config, ocfg OSConfig
 			// This is currently (2022-10-13) expected on certain iOS and macOS
 			// builds.
 		} else {
-			health.Global.SetDNSOSHealth(err)
+			m.health.SetDNSOSHealth(err)
 			return resolver.Config{}, OSConfig{}, err
 		}
 	}
@@ -453,12 +455,12 @@ func (m *Manager) FlushCaches() error {
 // in case the Tailscale daemon terminated without closing the router.
 // No other state needs to be instantiated before this runs.
 func CleanUp(logf logger.Logf, interfaceName string) {
-	oscfg, err := NewOSConfigurator(logf, interfaceName)
+	oscfg, err := NewOSConfigurator(logf, nil, interfaceName)
 	if err != nil {
 		logf("creating dns cleanup: %v", err)
 		return
 	}
-	dns := NewManager(logf, oscfg, nil, &tsdial.Dialer{Logf: logf}, nil, nil)
+	dns := NewManager(logf, oscfg, nil, nil, &tsdial.Dialer{Logf: logf}, nil, nil)
 	if err := dns.Down(); err != nil {
 		logf("dns down: %v", err)
 	}

net/dns/manager_darwin.go

@@ -8,11 +8,12 @@ import (
 	"os"
 
 	"go4.org/mem"
+	"tailscale.com/health"
 	"tailscale.com/types/logger"
 	"tailscale.com/util/mak"
 )
 
-func NewOSConfigurator(logf logger.Logf, ifName string) (OSConfigurator, error) {
+func NewOSConfigurator(logf logger.Logf, health *health.Tracker, ifName string) (OSConfigurator, error) {
 	return &darwinConfigurator{logf: logf, ifName: ifName}, nil
 }
 

net/dns/manager_default.go

@@ -5,11 +5,11 @@
 
 package dns
 
-import "tailscale.com/types/logger"
+import (
+	"tailscale.com/health"
+	"tailscale.com/types/logger"
+)
 
-func NewOSConfigurator(logger.Logf, string) (OSConfigurator, error) {
-	// TODO(dmytro): on darwin, we should use a macOS-specific method such as scutil.
-	// This is currently not implemented. Editing /etc/resolv.conf does not work,
-	// as most applications use the system resolver, which disregards it.
+func NewOSConfigurator(logger.Logf, *health.Tracker, string) (OSConfigurator, error) {
 	return NewNoopManager()
 }

net/dns/manager_freebsd.go

@@ -7,13 +7,14 @@ import (
 	"fmt"
 	"os"
 
+	"tailscale.com/health"
 	"tailscale.com/types/logger"
 )
 
-func NewOSConfigurator(logf logger.Logf, _ string) (OSConfigurator, error) {
+func NewOSConfigurator(logf logger.Logf, health *health.Tracker, _ string) (OSConfigurator, error) {
 	bs, err := os.ReadFile("/etc/resolv.conf")
 	if os.IsNotExist(err) {
-		return newDirectManager(logf), nil
+		return newDirectManager(logf, health), nil
 	}
 	if err != nil {
 		return nil, fmt.Errorf("reading /etc/resolv.conf: %w", err)
@@ -23,16 +24,16 @@ func NewOSConfigurator(logf logger.Logf, _ string) (OSConfigurator, error) {
 	case "resolvconf":
 		switch resolvconfStyle() {
 		case "":
-			return newDirectManager(logf), nil
+			return newDirectManager(logf, health), nil
 		case "debian":
 			return newDebianResolvconfManager(logf)
 		case "openresolv":
 			return newOpenresolvManager(logf)
 		default:
 			logf("[unexpected] got unknown flavor of resolvconf %q, falling back to direct manager", resolvconfStyle())
-			return newDirectManager(logf), nil
+			return newDirectManager(logf, health), nil
 		}
 	default:
-		return newDirectManager(logf), nil
+		return newDirectManager(logf, health), nil
 	}
 }

net/dns/manager_linux.go

@@ -31,7 +31,7 @@ func (kv kv) String() string {
 
 var publishOnce sync.Once
 
-func NewOSConfigurator(logf logger.Logf, interfaceName string) (ret OSConfigurator, err error) {
+func NewOSConfigurator(logf logger.Logf, health *health.Tracker, interfaceName string) (ret OSConfigurator, err error) {
 	env := newOSConfigEnv{
 		fs:                directFS{},
 		dbusPing:          dbusPing,
@@ -40,7 +40,7 @@ func NewOSConfigurator(logf logger.Logf, interfaceName string) (ret OSConfigurat
 		nmVersionBetween:  nmVersionBetween,
 		resolvconfStyle:   resolvconfStyle,
 	}
-	mode, err := dnsMode(logf, env)
+	mode, err := dnsMode(logf, health, env)
 	if err != nil {
 		return nil, err
 	}
@@ -52,9 +52,9 @@ func NewOSConfigurator(logf logger.Logf, interfaceName string) (ret OSConfigurat
 	logf("dns: using %q mode", mode)
 	switch mode {
 	case "direct":
-		return newDirectManagerOnFS(logf, env.fs), nil
+		return newDirectManagerOnFS(logf, health, env.fs), nil
 	case "systemd-resolved":
-		return newResolvedManager(logf, interfaceName)
+		return newResolvedManager(logf, health, interfaceName)
 	case "network-manager":
 		return newNMManager(interfaceName)
 	case "debian-resolvconf":
@@ -63,7 +63,7 @@ func NewOSConfigurator(logf logger.Logf, interfaceName string) (ret OSConfigurat
 		return newOpenresolvManager(logf)
 	default:
 		logf("[unexpected] detected unknown DNS mode %q, using direct manager as last resort", mode)
-		return newDirectManagerOnFS(logf, env.fs), nil
+		return newDirectManagerOnFS(logf, health, env.fs), nil
 	}
 }
 
@@ -77,7 +77,7 @@ type newOSConfigEnv struct {
 	resolvconfStyle   func() string
 }
 
-func dnsMode(logf logger.Logf, env newOSConfigEnv) (ret string, err error) {
+func dnsMode(logf logger.Logf, health *health.Tracker, env newOSConfigEnv) (ret string, err error) {
 	var debug []kv
 	dbg := func(k, v string) {
 		debug = append(debug, kv{k, v})
@@ -271,7 +271,7 @@ func dnsMode(logf logger.Logf, env newOSConfigEnv) (ret string, err error) {
 			return "direct", nil
 		}
 
-		health.Global.SetDNSManagerHealth(errors.New("systemd-resolved and NetworkManager are wired together incorrectly; MagicDNS will probably not work. For more info, see https://tailscale.com/s/resolved-nm"))
+		health.SetDNSManagerHealth(errors.New("systemd-resolved and NetworkManager are wired together incorrectly; MagicDNS will probably not work. For more info, see https://tailscale.com/s/resolved-nm"))
 		dbg("nm-safe", "no")
 		return "systemd-resolved", nil
 	default:

net/dns/manager_linux_test.go

@@ -286,7 +286,7 @@ func TestLinuxDNSMode(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			var logBuf tstest.MemLogger
-			got, err := dnsMode(logBuf.Logf, tt.env)
+			got, err := dnsMode(logBuf.Logf, nil, tt.env)
 			if err != nil {
 				t.Fatal(err)
 			}

net/dns/manager_openbsd.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"os"
 
+	"tailscale.com/health"
 	"tailscale.com/types/logger"
 )
 
@@ -19,8 +20,8 @@ func (kv kv) String() string {
 	return fmt.Sprintf("%s=%s", kv.k, kv.v)
 }
 
-func NewOSConfigurator(logf logger.Logf, interfaceName string) (OSConfigurator, error) {
-	return newOSConfigurator(logf, interfaceName,
+func NewOSConfigurator(logf logger.Logf, health *health.Tracker, interfaceName string) (OSConfigurator, error) {
+	return newOSConfigurator(logf, health, interfaceName,
 		newOSConfigEnv{
 			rcIsResolvd: rcIsResolvd,
 			fs:          directFS{},
@@ -33,7 +34,7 @@ type newOSConfigEnv struct {
 	rcIsResolvd func(resolvConfContents []byte) bool
 }
 
-func newOSConfigurator(logf logger.Logf, interfaceName string, env newOSConfigEnv) (ret OSConfigurator, err error) {
+func newOSConfigurator(logf logger.Logf, health *health.Tracker, interfaceName string, env newOSConfigEnv) (ret OSConfigurator, err error) {
 	var debug []kv
 	dbg := func(k, v string) {
 		debug = append(debug, kv{k, v})
@@ -48,7 +49,7 @@ func newOSConfigurator(logf logger.Logf, interfaceName string, env newOSConfigEn
 	bs, err := env.fs.ReadFile(resolvConf)
 	if os.IsNotExist(err) {
 		dbg("rc", "missing")
-		return newDirectManager(logf), nil
+		return newDirectManager(logf, health), nil
 	}
 	if err != nil {
 		return nil, fmt.Errorf("reading /etc/resolv.conf: %w", err)
@@ -60,7 +61,7 @@ func newOSConfigurator(logf logger.Logf, interfaceName string, env newOSConfigEn
 	}
 
 	dbg("resolvd", "missing")
-	return newDirectManager(logf), nil
+	return newDirectManager(logf, health), nil
 }
 
 func rcIsResolvd(resolvConfContents []byte) bool {

net/dns/manager_tcp_test.go

@@ -87,7 +87,7 @@ func TestDNSOverTCP(t *testing.T) {
 			SearchDomains: fqdns("coffee.shop"),
 		},
 	}
-	m := NewManager(t.Logf, &f, nil, new(tsdial.Dialer), nil, nil)
+	m := NewManager(t.Logf, &f, nil, nil, new(tsdial.Dialer), nil, nil)
 	m.resolver.TestOnlySetHook(f.SetResolver)
 	m.Set(Config{
 		Hosts: hosts(
@@ -172,7 +172,7 @@ func TestDNSOverTCP_TooLarge(t *testing.T) {
 			SearchDomains: fqdns("coffee.shop"),
 		},
 	}
-	m := NewManager(log, &f, nil, new(tsdial.Dialer), nil, nil)
+	m := NewManager(log, &f, nil, nil, new(tsdial.Dialer), nil, nil)
 	m.resolver.TestOnlySetHook(f.SetResolver)
 	m.Set(Config{
 		Hosts:         hosts("andrew.ts.com.", "1.2.3.4"),

net/dns/manager_test.go

@@ -613,7 +613,7 @@ func TestManager(t *testing.T) {
 				SplitDNS:   test.split,
 				BaseConfig: test.bs,
 			}
-			m := NewManager(t.Logf, &f, nil, new(tsdial.Dialer), nil, nil)
+			m := NewManager(t.Logf, &f, nil, nil, new(tsdial.Dialer), nil, nil)
 			m.resolver.TestOnlySetHook(f.SetResolver)
 
 			if err := m.Set(test.in); err != nil {

net/dns/manager_windows.go

@@ -23,6 +23,7 @@ import (
 	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
 	"tailscale.com/atomicfile"
 	"tailscale.com/envknob"
+	"tailscale.com/health"
 	"tailscale.com/types/logger"
 	"tailscale.com/util/dnsname"
 	"tailscale.com/util/winutil"
@@ -44,11 +45,11 @@ type windowsManager struct {
 	closing bool
 }
 
-func NewOSConfigurator(logf logger.Logf, interfaceName string) (OSConfigurator, error) {
+func NewOSConfigurator(logf logger.Logf, health *health.Tracker, interfaceName string) (OSConfigurator, error) {
 	ret := &windowsManager{
 		logf:       logf,
 		guid:       interfaceName,
-		wslManager: newWSLManager(logf),
+		wslManager: newWSLManager(logf, health),
 	}
 
 	if isWindows10OrBetter() {

net/dns/manager_windows_test.go

@@ -84,7 +84,7 @@ func TestManagerWindowsGPCopy(t *testing.T) {
 	}
 	defer delIfKey()
 
-	cfg, err := NewOSConfigurator(logf, fakeInterface.String())
+	cfg, err := NewOSConfigurator(logf, nil, fakeInterface.String())
 	if err != nil {
 		t.Fatalf("NewOSConfigurator: %v\n", err)
 	}
@@ -213,7 +213,7 @@ func runTest(t *testing.T, isLocal bool) {
 	}
 	defer delIfKey()
 
-	cfg, err := NewOSConfigurator(logf, fakeInterface.String())
+	cfg, err := NewOSConfigurator(logf, nil, fakeInterface.String())
 	if err != nil {
 		t.Fatalf("NewOSConfigurator: %v\n", err)
 	}

net/dns/resolved.go

@@ -63,13 +63,14 @@ type resolvedManager struct {
 	ctx    context.Context
 	cancel func() // terminate the context, for close
 
-	logf  logger.Logf
-	ifidx int
+	logf   logger.Logf
+	health *health.Tracker
+	ifidx  int
 
 	configCR chan changeRequest // tracks OSConfigs changes and error responses
 }
 
-func newResolvedManager(logf logger.Logf, interfaceName string) (*resolvedManager, error) {
+func newResolvedManager(logf logger.Logf, health *health.Tracker, interfaceName string) (*resolvedManager, error) {
 	iface, err := net.InterfaceByName(interfaceName)
 	if err != nil {
 		return nil, err
@@ -82,8 +83,9 @@ func newResolvedManager(logf logger.Logf, interfaceName string) (*resolvedManage
 		ctx:    ctx,
 		cancel: cancel,
 
-		logf:  logf,
-		ifidx: iface.Index,
+		logf:   logf,
+		health: health,
+		ifidx:  iface.Index,
 
 		configCR: make(chan changeRequest),
 	}
@@ -163,7 +165,7 @@ func (m *resolvedManager) run(ctx context.Context) {
 
 		// Reset backoff and SetNSOSHealth after successful on reconnect.
 		bo.BackOff(ctx, nil)
-		health.Global.SetDNSOSHealth(nil)
+		m.health.SetDNSOSHealth(nil)
 		return nil
 	}
 
@@ -241,7 +243,7 @@ func (m *resolvedManager) run(ctx context.Context) {
 			// Set health while holding the lock, because this will
 			// graciously serialize the resync's health outcome with a
 			// concurrent SetDNS call.
-			health.Global.SetDNSOSHealth(err)
+			m.health.SetDNSOSHealth(err)
 			if err != nil {
 				m.logf("failed to configure systemd-resolved: %v", err)
 			}

net/dns/wsl_windows.go

@@ -16,6 +16,7 @@ import (
 	"time"
 
 	"golang.org/x/sys/windows"
+	"tailscale.com/health"
 	"tailscale.com/types/logger"
 	"tailscale.com/util/winutil"
 )
@@ -54,12 +55,14 @@ func wslDistros() ([]string, error) {
 // wslManager is a DNS manager for WSL2 linux distributions.
 // It configures /etc/wsl.conf and /etc/resolv.conf.
 type wslManager struct {
-	logf logger.Logf
+	logf   logger.Logf
+	health *health.Tracker
 }
 
-func newWSLManager(logf logger.Logf) *wslManager {
+func newWSLManager(logf logger.Logf, health *health.Tracker) *wslManager {
 	m := &wslManager{
-		logf: logf,
+		logf:   logf,
+		health: health,
 	}
 	return m
 }
@@ -73,7 +76,7 @@ func (wm *wslManager) SetDNS(cfg OSConfig) error {
 	}
 	managers := make(map[string]*directManager)
 	for _, distro := range distros {
-		managers[distro] = newDirectManagerOnFS(wm.logf, wslFS{
+		managers[distro] = newDirectManagerOnFS(wm.logf, wm.health, wslFS{
 			user:   "root",
 			distro: distro,
 		})

tsd/tsd.go

@@ -139,14 +139,6 @@ func (s *System) ProxyMapper() *proxymap.Mapper {
 
 // HealthTracker returns the system health tracker.
 func (s *System) HealthTracker() *health.Tracker {
-	// TODO(bradfitz): plumb the tsd.System.HealthTracker() value
-	// everywhere and then then remove this use of the global
-	// and remove health.Global entirely. But for now we keep
-	// the two in sync during plumbing.
-	const stillPlumbing = true
-	if stillPlumbing {
-		return health.Global
-	}
 	return &s.healthTracker
 }
 

tsnet/tsnet.go

@@ -31,6 +31,7 @@ import (
 	"tailscale.com/client/tailscale"
 	"tailscale.com/control/controlclient"
 	"tailscale.com/envknob"
+	"tailscale.com/health"
 	"tailscale.com/hostinfo"
 	"tailscale.com/ipn"
 	"tailscale.com/ipn/ipnlocal"
@@ -233,7 +234,7 @@ func (s *Server) Loopback() (addr string, proxyCred, localAPICred string, err er
 		// out the CONNECT code from tailscaled/proxy.go that uses
 		// httputil.ReverseProxy and adding auth support.
 		go func() {
-			lah := localapi.NewHandler(s.lb, s.logf, s.netMon, s.logid)
+			lah := localapi.NewHandler(s.lb, s.logf, s.logid)
 			lah.PermitWrite = true
 			lah.PermitRead = true
 			lah.RequiredPassword = s.localAPICred
@@ -504,7 +505,8 @@ func (s *Server) start() (reterr error) {
 		return fmt.Errorf("%v is not a directory", s.rootPath)
 	}
 
-	if err := s.startLogger(&closePool); err != nil {
+	sys := new(tsd.System)
+	if err := s.startLogger(&closePool, sys.HealthTracker()); err != nil {
 		return err
 	}
 
@@ -514,14 +516,14 @@ func (s *Server) start() (reterr error) {
 	}
 	closePool.add(s.netMon)
 
-	sys := new(tsd.System)
 	s.dialer = &tsdial.Dialer{Logf: logf} // mutated below (before used)
 	eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
-		ListenPort:   s.Port,
-		NetMon:       s.netMon,
-		Dialer:       s.dialer,
-		SetSubsystem: sys.Set,
-		ControlKnobs: sys.ControlKnobs(),
+		ListenPort:    s.Port,
+		NetMon:        s.netMon,
+		Dialer:        s.dialer,
+		SetSubsystem:  sys.Set,
+		ControlKnobs:  sys.ControlKnobs(),
+		HealthTracker: sys.HealthTracker(),
 	})
 	if err != nil {
 		return err
@@ -606,7 +608,7 @@ func (s *Server) start() (reterr error) {
 	go s.printAuthURLLoop()
 
 	// Run the localapi handler, to allow fetching LetsEncrypt certs.
-	lah := localapi.NewHandler(lb, logf, s.netMon, s.logid)
+	lah := localapi.NewHandler(lb, logf, s.logid)
 	lah.PermitWrite = true
 	lah.PermitRead = true
 
@@ -626,7 +628,7 @@ func (s *Server) start() (reterr error) {
 	return nil
 }
 
-func (s *Server) startLogger(closePool *closeOnErrorPool) error {
+func (s *Server) startLogger(closePool *closeOnErrorPool, health *health.Tracker) error {
 	if testenv.InTest() {
 		return nil
 	}
@@ -657,7 +659,7 @@ func (s *Server) startLogger(closePool *closeOnErrorPool) error {
 		Stderr:       io.Discard, // log everything to Buffer
 		Buffer:       s.logbuffer,
 		CompressLogs: true,
-		HTTPC:        &http.Client{Transport: logpolicy.NewLogtailTransport(logtail.DefaultHost, s.netMon, s.logf)},
+		HTTPC:        &http.Client{Transport: logpolicy.NewLogtailTransport(logtail.DefaultHost, s.netMon, health, s.logf)},
 		MetricsDelta: clientmetric.EncodeLogTailMetricsDelta,
 	}
 	s.logtail = logtail.NewLogger(c, s.logf)

wgengine/magicsock/derp.go

@@ -165,7 +165,7 @@ func (c *Conn) maybeSetNearestDERP(report *netcheck.Report) (preferredDERP int)
 	if testenv.InTest() && !checkControlHealthDuringNearestDERPInTests {
 		connectedToControl = true
 	} else {
-		connectedToControl = health.Global.GetInPollNetMap()
+		connectedToControl = c.health.GetInPollNetMap()
 	}
 	if !connectedToControl {
 		c.mu.Lock()
@@ -201,12 +201,12 @@ func (c *Conn) setNearestDERP(derpNum int) (wantDERP bool) {
 	defer c.mu.Unlock()
 	if !c.wantDerpLocked() {
 		c.myDerp = 0
-		health.Global.SetMagicSockDERPHome(0, c.homeless)
+		c.health.SetMagicSockDERPHome(0, c.homeless)
 		return false
 	}
 	if c.homeless {
 		c.myDerp = 0
-		health.Global.SetMagicSockDERPHome(0, c.homeless)
+		c.health.SetMagicSockDERPHome(0, c.homeless)
 		return false
 	}
 	if derpNum == c.myDerp {
@@ -217,7 +217,7 @@ func (c *Conn) setNearestDERP(derpNum int) (wantDERP bool) {
 		metricDERPHomeChange.Add(1)
 	}
 	c.myDerp = derpNum
-	health.Global.SetMagicSockDERPHome(derpNum, c.homeless)
+	c.health.SetMagicSockDERPHome(derpNum, c.homeless)
 
 	if c.privateKey.IsZero() {
 		// No private key yet, so DERP connections won't come up anyway.
@@ -400,7 +400,7 @@ func (c *Conn) derpWriteChanOfAddr(addr netip.AddrPort, peer key.NodePublic) cha
 		}
 		return derpMap.Regions[regionID]
 	})
-	dc.HealthTracker = health.Global
+	dc.HealthTracker = c.health
 
 	dc.SetCanAckPings(true)
 	dc.NotePreferred(c.myDerp == regionID)
@@ -526,8 +526,8 @@ func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netip.AddrPort, d
 		return n
 	}
 
-	defer health.Global.SetDERPRegionConnectedState(regionID, false)
-	defer health.Global.SetDERPRegionHealth(regionID, "")
+	defer c.health.SetDERPRegionConnectedState(regionID, false)
+	defer c.health.SetDERPRegionHealth(regionID, "")
 
 	// peerPresent is the set of senders we know are present on this
 	// connection, based on messages we've received from the server.
@@ -539,7 +539,7 @@ func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netip.AddrPort, d
 	for {
 		msg, connGen, err := dc.RecvDetail()
 		if err != nil {
-			health.Global.SetDERPRegionConnectedState(regionID, false)
+			c.health.SetDERPRegionConnectedState(regionID, false)
 			// Forget that all these peers have routes.
 			for peer := range peerPresent {
 				delete(peerPresent, peer)
@@ -577,14 +577,14 @@ func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netip.AddrPort, d
 
 		now := time.Now()
 		if lastPacketTime.IsZero() || now.Sub(lastPacketTime) > frameReceiveRecordRate {
-			health.Global.NoteDERPRegionReceivedFrame(regionID)
+			c.health.NoteDERPRegionReceivedFrame(regionID)
 			lastPacketTime = now
 		}
 
 		switch m := msg.(type) {
 		case derp.ServerInfoMessage:
-			health.Global.SetDERPRegionConnectedState(regionID, true)
-			health.Global.SetDERPRegionHealth(regionID, "") // until declared otherwise
+			c.health.SetDERPRegionConnectedState(regionID, true)
+			c.health.SetDERPRegionHealth(regionID, "") // until declared otherwise
 			c.logf("magicsock: derp-%d connected; connGen=%v", regionID, connGen)
 			continue
 		case derp.ReceivedPacket:
@@ -624,7 +624,7 @@ func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netip.AddrPort, d
 			}()
 			continue
 		case derp.HealthMessage:
-			health.Global.SetDERPRegionHealth(regionID, m.Problem)
+			c.health.SetDERPRegionHealth(regionID, m.Problem)
 			continue
 		case derp.PeerGoneMessage:
 			switch m.Reason {

wgengine/magicsock/magicsock.go

@@ -91,6 +91,7 @@ type Conn struct {
 	testOnlyPacketListener nettype.PacketListener
 	noteRecvActivity       func(key.NodePublic) // or nil, see Options.NoteRecvActivity
 	netMon                 *netmon.Monitor      // or nil
+	health                 *health.Tracker      // or nil
 	controlKnobs           *controlknobs.Knobs  // or nil
 
 	// ================================================================
@@ -369,9 +370,13 @@ type Options struct {
 	NoteRecvActivity func(key.NodePublic)
 
 	// NetMon is the network monitor to use.
-	// With one, the portmapper won't be used.
+	// If nil, the portmapper won't be used.
 	NetMon *netmon.Monitor
 
+	// HealthTracker optionally specifies the health tracker to
+	// report errors and warnings to.
+	HealthTracker *health.Tracker
+
 	// ControlKnobs are the set of control knobs to use.
 	// If nil, they're ignored and not updated.
 	ControlKnobs *controlknobs.Knobs
@@ -463,6 +468,7 @@ func NewConn(opts Options) (*Conn, error) {
 		c.portMapper.SetGatewayLookupFunc(opts.NetMon.GatewayAndSelfIP)
 	}
 	c.netMon = opts.NetMon
+	c.health = opts.HealthTracker
 	c.onPortUpdate = opts.OnPortUpdate
 	c.getPeerByKey = opts.PeerByKeyFunc
 
@@ -666,7 +672,7 @@ func (c *Conn) updateNetInfo(ctx context.Context) (*netcheck.Report, error) {
 		// NOTE(andrew-d): I don't love that we're depending on the
 		// health package here, but I'd rather do that and not store
 		// the exact same state in two different places.
-		GetLastDERPActivity: health.Global.GetDERPRegionReceivedTime,
+		GetLastDERPActivity: c.health.GetDERPRegionReceivedTime,
 	})
 	if err != nil {
 		return nil, err
@@ -2471,7 +2477,7 @@ func (c *Conn) bindSocket(ruc *RebindingUDPConn, network string, curPortFate cur
 		}
 		ruc.setConnLocked(pconn, network, c.bind.BatchSize())
 		if network == "udp4" {
-			health.Global.SetUDP4Unbound(false)
+			c.health.SetUDP4Unbound(false)
 		}
 		return nil
 	}
@@ -2482,7 +2488,7 @@ func (c *Conn) bindSocket(ruc *RebindingUDPConn, network string, curPortFate cur
 	// we get a link change and we can try binding again.
 	ruc.setConnLocked(newBlockForeverConn(), "", c.bind.BatchSize())
 	if network == "udp4" {
-		health.Global.SetUDP4Unbound(true)
+		c.health.SetUDP4Unbound(true)
 	}
 	return fmt.Errorf("failed to bind any ports (tried %v)", ports)
 }

wgengine/magicsock/magicsock_test.go

@@ -3113,21 +3113,23 @@ func TestMaybeSetNearestDERP(t *testing.T) {
 	}
 	for _, tt := range testCases {
 		t.Run(tt.name, func(t *testing.T) {
+			ht := new(health.Tracker)
 			c := newConn()
 			c.logf = t.Logf
 			c.myDerp = tt.old
 			c.derpMap = derpMap
+			c.health = ht
 
 			report := &netcheck.Report{PreferredDERP: tt.reportDERP}
 
-			oldConnected := health.Global.GetInPollNetMap()
+			oldConnected := ht.GetInPollNetMap()
 			if tt.connectedToControl != oldConnected {
 				if tt.connectedToControl {
-					health.Global.GotStreamedMapResponse()
-					t.Cleanup(health.Global.SetOutOfPollNetMap)
+					ht.GotStreamedMapResponse()
+					t.Cleanup(ht.SetOutOfPollNetMap)
 				} else {
-					health.Global.SetOutOfPollNetMap()
-					t.Cleanup(health.Global.GotStreamedMapResponse)
+					ht.SetOutOfPollNetMap()
+					t.Cleanup(ht.GotStreamedMapResponse)
 				}
 			}
 

wgengine/netlog/logger.go

@@ -16,6 +16,7 @@ import (
 	"sync"
 	"time"
 
+	"tailscale.com/health"
 	"tailscale.com/logpolicy"
 	"tailscale.com/logtail"
 	"tailscale.com/net/connstats"
@@ -92,7 +93,7 @@ var testClient *http.Client
 // The IP protocol and source port are always zero.
 // The sock is used to populated the PhysicalTraffic field in Message.
 // The netMon parameter is optional; if non-nil it's used to do faster interface lookups.
-func (nl *Logger) Startup(nodeID tailcfg.StableNodeID, nodeLogID, domainLogID logid.PrivateID, tun, sock Device, netMon *netmon.Monitor) error {
+func (nl *Logger) Startup(nodeID tailcfg.StableNodeID, nodeLogID, domainLogID logid.PrivateID, tun, sock Device, netMon *netmon.Monitor, health *health.Tracker) error {
 	nl.mu.Lock()
 	defer nl.mu.Unlock()
 	if nl.logger != nil {
@@ -101,7 +102,7 @@ func (nl *Logger) Startup(nodeID tailcfg.StableNodeID, nodeLogID, domainLogID lo
 
 	// Startup a log stream to Tailscale's logging service.
 	logf := log.Printf
-	httpc := &http.Client{Transport: logpolicy.NewLogtailTransport(logtail.DefaultHost, netMon, logf)}
+	httpc := &http.Client{Transport: logpolicy.NewLogtailTransport(logtail.DefaultHost, netMon, health, logf)}
 	if testClient != nil {
 		httpc = testClient
 	}

wgengine/router/ifconfig_windows.go

@@ -237,7 +237,7 @@ func interfaceFromLUID(luid winipcfg.LUID, flags winipcfg.GAAFlags) (*winipcfg.I
 
 var networkCategoryWarning = health.NewWarnable(health.WithMapDebugFlag("warn-network-category-unhealthy"))
 
-func configureInterface(cfg *Config, tun *tun.NativeTun) (retErr error) {
+func configureInterface(cfg *Config, tun *tun.NativeTun, health *health.Tracker) (retErr error) {
 	var mtu = tstun.DefaultTUNMTU()
 	luid := winipcfg.LUID(tun.LUID())
 	iface, err := interfaceFromLUID(luid,
@@ -268,10 +268,10 @@ func configureInterface(cfg *Config, tun *tun.NativeTun) (retErr error) {
 		for i := range tries {
 			found, err := setPrivateNetwork(luid)
 			if err != nil {
-				health.Global.SetWarnable(networkCategoryWarning, fmt.Errorf("set-network-category: %w", err))
+				health.SetWarnable(networkCategoryWarning, fmt.Errorf("set-network-category: %w", err))
 				log.Printf("setPrivateNetwork(try=%d): %v", i, err)
 			} else {
-				health.Global.SetWarnable(networkCategoryWarning, nil)
+				health.SetWarnable(networkCategoryWarning, nil)
 				if found {
 					if i > 0 {
 						log.Printf("setPrivateNetwork(try=%d): success", i)

wgengine/router/router.go

@@ -10,6 +10,7 @@ import (
 	"reflect"
 
 	"github.com/tailscale/wireguard-go/tun"
+	"tailscale.com/health"
 	"tailscale.com/net/netmon"
 	"tailscale.com/types/logger"
 	"tailscale.com/types/preftype"
@@ -44,9 +45,9 @@ type Router interface {
 //
 // If netMon is nil, it's not used. It's currently (2021-07-20) only
 // used on Linux in some situations.
-func New(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor) (Router, error) {
+func New(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
 	logf = logger.WithPrefix(logf, "router: ")
-	return newUserspaceRouter(logf, tundev, netMon)
+	return newUserspaceRouter(logf, tundev, netMon, health)
 }
 
 // CleanUp restores the system network configuration to its original state

wgengine/router/router_darwin.go

@@ -5,12 +5,13 @@ package router
 
 import (
 	"github.com/tailscale/wireguard-go/tun"
+	"tailscale.com/health"
 	"tailscale.com/net/netmon"
 	"tailscale.com/types/logger"
 )
 
-func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor) (Router, error) {
-	return newUserspaceBSDRouter(logf, tundev, netMon)
+func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
+	return newUserspaceBSDRouter(logf, tundev, netMon, health)
 }
 
 func cleanUp(logger.Logf, string) {

wgengine/router/router_default.go

@@ -10,11 +10,12 @@ import (
 	"runtime"
 
 	"github.com/tailscale/wireguard-go/tun"
+	"tailscale.com/health"
 	"tailscale.com/net/netmon"
 	"tailscale.com/types/logger"
 )
 
-func newUserspaceRouter(logf logger.Logf, tunDev tun.Device, netMon *netmon.Monitor) (Router, error) {
+func newUserspaceRouter(logf logger.Logf, tunDev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
 	return nil, fmt.Errorf("unsupported OS %q", runtime.GOOS)
 }
 

wgengine/router/router_freebsd.go

@@ -5,6 +5,7 @@ package router
 
 import (
 	"github.com/tailscale/wireguard-go/tun"
+	"tailscale.com/health"
 	"tailscale.com/net/netmon"
 	"tailscale.com/types/logger"
 )
@@ -14,8 +15,8 @@ import (
 // Work is currently underway for an in-kernel FreeBSD implementation of wireguard
 // https://svnweb.freebsd.org/base?view=revision&revision=357986
 
-func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor) (Router, error) {
-	return newUserspaceBSDRouter(logf, tundev, netMon)
+func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
+	return newUserspaceBSDRouter(logf, tundev, netMon, health)
 }
 
 func cleanUp(logf logger.Logf, interfaceName string) {

wgengine/router/router_linux.go

@@ -22,6 +22,7 @@ import (
 	"golang.org/x/sys/unix"
 	"golang.org/x/time/rate"
 	"tailscale.com/envknob"
+	"tailscale.com/health"
 	"tailscale.com/net/netmon"
 	"tailscale.com/types/logger"
 	"tailscale.com/types/preftype"
@@ -69,7 +70,7 @@ type linuxRouter struct {
 	magicsockPortV6 uint16
 }
 
-func newUserspaceRouter(logf logger.Logf, tunDev tun.Device, netMon *netmon.Monitor) (Router, error) {
+func newUserspaceRouter(logf logger.Logf, tunDev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
 	tunname, err := tunDev.Name()
 	if err != nil {
 		return nil, err

wgengine/router/router_linux_test.go

@@ -886,7 +886,7 @@ func newLinuxRootTest(t *testing.T) *linuxTest {
 	mon.Start()
 	lt.mon = mon
 
-	r, err := newUserspaceRouter(logf, lt.tun, mon)
+	r, err := newUserspaceRouter(logf, lt.tun, mon, nil)
 	if err != nil {
 		lt.Close()
 		t.Fatal(err)

wgengine/router/router_openbsd.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/tailscale/wireguard-go/tun"
 	"go4.org/netipx"
+	"tailscale.com/health"
 	"tailscale.com/net/netmon"
 	"tailscale.com/types/logger"
 	"tailscale.com/util/set"
@@ -30,7 +31,7 @@ type openbsdRouter struct {
 	routes  set.Set[netip.Prefix]
 }
 
-func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor) (Router, error) {
+func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
 	tunname, err := tundev.Name()
 	if err != nil {
 		return nil, err

wgengine/router/router_userspace_bsd.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/tailscale/wireguard-go/tun"
 	"go4.org/netipx"
+	"tailscale.com/health"
 	"tailscale.com/net/netmon"
 	"tailscale.com/net/tsaddr"
 	"tailscale.com/types/logger"
@@ -23,12 +24,13 @@ import (
 type userspaceBSDRouter struct {
 	logf    logger.Logf
 	netMon  *netmon.Monitor
+	health  *health.Tracker
 	tunname string
 	local   []netip.Prefix
 	routes  map[netip.Prefix]bool
 }
 
-func newUserspaceBSDRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor) (Router, error) {
+func newUserspaceBSDRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
 	tunname, err := tundev.Name()
 	if err != nil {
 		return nil, err
@@ -37,6 +39,7 @@ func newUserspaceBSDRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.M
 	return &userspaceBSDRouter{
 		logf:    logf,
 		netMon:  netMon,
+		health:  health,
 		tunname: tunname,
 	}, nil
 }

wgengine/router/router_windows.go

@@ -22,6 +22,7 @@ import (
 	"github.com/tailscale/wireguard-go/tun"
 	"golang.org/x/sys/windows"
 	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
+	"tailscale.com/health"
 	"tailscale.com/logtail/backoff"
 	"tailscale.com/net/dns"
 	"tailscale.com/net/netmon"
@@ -31,12 +32,13 @@ import (
 type winRouter struct {
 	logf                func(fmt string, args ...any)
 	netMon              *netmon.Monitor // may be nil
+	health              *health.Tracker
 	nativeTun           *tun.NativeTun
 	routeChangeCallback *winipcfg.RouteChangeCallback
 	firewall            *firewallTweaker
 }
 
-func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor) (Router, error) {
+func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
 	nativeTun := tundev.(*tun.NativeTun)
 	luid := winipcfg.LUID(nativeTun.LUID())
 	guid, err := luid.GUID()
@@ -47,6 +49,7 @@ func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Moni
 	return &winRouter{
 		logf:      logf,
 		netMon:    netMon,
+		health:    health,
 		nativeTun: nativeTun,
 		firewall: &firewallTweaker{
 			logf:    logger.WithPrefix(logf, "firewall: "),
@@ -80,7 +83,7 @@ func (r *winRouter) Set(cfg *Config) error {
 	}
 	r.firewall.set(localAddrs, cfg.Routes, cfg.LocalRoutes)
 
-	err := configureInterface(cfg, r.nativeTun)
+	err := configureInterface(cfg, r.nativeTun, r.health)
 	if err != nil {
 		r.logf("ConfigureInterface: %v", err)
 		return err

wgengine/userspace.go

@@ -98,6 +98,7 @@ type userspaceEngine struct {
 	dns              *dns.Manager
 	magicConn        *magicsock.Conn
 	netMon           *netmon.Monitor
+	health           *health.Tracker
 	netMonOwned      bool                // whether we created netMon (and thus need to close it)
 	netMonUnregister func()              // unsubscribes from changes; used regardless of netMonOwned
 	birdClient       BIRDClient          // or nil
@@ -188,6 +189,9 @@ type Config struct {
 	// If nil, a new network monitor is created.
 	NetMon *netmon.Monitor
 
+	// HealthTracker, if non-nil, is the health tracker to use.
+	HealthTracker *health.Tracker
+
 	// Dialer is the dialer to use for outbound connections.
 	// If nil, a new Dialer is created
 	Dialer *tsdial.Dialer
@@ -310,6 +314,7 @@ func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error)
 		birdClient:     conf.BIRDClient,
 		controlKnobs:   conf.ControlKnobs,
 		reconfigureVPN: conf.ReconfigureVPN,
+		health:         conf.HealthTracker,
 	}
 
 	if e.birdClient != nil {
@@ -336,7 +341,7 @@ func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error)
 	tunName, _ := conf.Tun.Name()
 	conf.Dialer.SetTUNName(tunName)
 	conf.Dialer.SetNetMon(e.netMon)
-	e.dns = dns.NewManager(logf, conf.DNS, e.netMon, conf.Dialer, fwdDNSLinkSelector{e, tunName}, conf.ControlKnobs)
+	e.dns = dns.NewManager(logf, conf.DNS, e.netMon, e.health, conf.Dialer, fwdDNSLinkSelector{e, tunName}, conf.ControlKnobs)
 
 	// TODO: there's probably a better place for this
 	sockstats.SetNetMon(e.netMon)
@@ -372,6 +377,7 @@ func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error)
 		IdleFunc:         e.tundev.IdleDuration,
 		NoteRecvActivity: e.noteRecvActivity,
 		NetMon:           e.netMon,
+		HealthTracker:    e.health,
 		ControlKnobs:     conf.ControlKnobs,
 		OnPortUpdate:     onPortUpdate,
 		PeerByKeyFunc:    e.PeerByKey,
@@ -960,7 +966,7 @@ func (e *userspaceEngine) Reconfig(cfg *wgcfg.Config, routerCfg *router.Config,
 		nid := cfg.NetworkLogging.NodeID
 		tid := cfg.NetworkLogging.DomainID
 		e.logf("wgengine: Reconfig: starting up network logger (node:%s tailnet:%s)", nid.Public(), tid.Public())
-		if err := e.networkLogger.Startup(cfg.NodeID, nid, tid, e.tundev, e.magicConn, e.netMon); err != nil {
+		if err := e.networkLogger.Startup(cfg.NodeID, nid, tid, e.tundev, e.magicConn, e.netMon, e.health); err != nil {
 			e.logf("wgengine: Reconfig: error starting up network logger: %v", err)
 		}
 		e.networkLogger.ReconfigRoutes(routerCfg)
@@ -970,7 +976,7 @@ func (e *userspaceEngine) Reconfig(cfg *wgcfg.Config, routerCfg *router.Config,
 		e.logf("wgengine: Reconfig: configuring router")
 		e.networkLogger.ReconfigRoutes(routerCfg)
 		err := e.router.Set(routerCfg)
-		health.Global.SetRouterHealth(err)
+		e.health.SetRouterHealth(err)
 		if err != nil {
 			return err
 		}
@@ -979,7 +985,7 @@ func (e *userspaceEngine) Reconfig(cfg *wgcfg.Config, routerCfg *router.Config,
 		// assigned address.
 		e.logf("wgengine: Reconfig: configuring DNS")
 		err = e.dns.Set(*dnsCfg)
-		health.Global.SetDNSHealth(err)
+		e.health.SetDNSHealth(err)
 		if err != nil {
 			return err
 		}
@@ -1183,7 +1189,7 @@ func (e *userspaceEngine) linkChange(delta *netmon.ChangeDelta) {
 		e.logf("[v1] LinkChange: minor")
 	}
 
-	health.Global.SetAnyInterfaceUp(up)
+	e.health.SetAnyInterfaceUp(up)
 	e.magicConn.SetNetworkUp(up)
 	if !up || changed {
 		if err := e.dns.FlushCaches(); err != nil {