health, all: remove health.Global, finish plumbing health.Tracker

Updates #11874
Updates #4136

Change-Id: I414470f71d90be9889d44c3afd53956d9f26cd61
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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() {
@@ -677,7 +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)
 			}
@@ -699,13 +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

@@ -107,6 +107,7 @@ func newIPN(jsConfig js.Value) map[string]any {
 		Dialer:        dialer,
 		SetSubsystem:  sys.Set,
 		ControlKnobs:  sys.ControlKnobs(),
+		HealthTracker: sys.HealthTracker(),
 	})
 	if err != nil {
 		log.Fatal(err)

control/controlclient/direct.go

@@ -1460,6 +1460,7 @@ func (c *Direct) getNoiseClient() (*NoiseClient, error) {
 			DNSCache:      c.dnsCache,
 			Logf:          c.logf,
 			NetMon:        c.netMon,
+			HealthTracker: c.health,
 			DialPlan:      dp,
 		})
 		if err != nil {

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

@@ -30,15 +30,9 @@ var (
 	debugHandler map[string]http.Handler
 )
 
-// Global is a global health tracker for the process.
+// Tracker tracks the health of various Tailscale subsystems,
-//
+// comparing each subsystems' state with each other to make sure
-// TODO(bradfitz): finish moving all reference to this plumb it (ultimately out
+// they're consistent based on the user's intended state.
-// 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)
-
 type Tracker struct {
 	// mu guards everything in this var block.
 	mu sync.Mutex

ipn/ipnlocal/local.go

@@ -415,7 +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)
 	}

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 {
+func New(collection string, netMon *netmon.Monitor, health *health.Tracker, logf logger.Logf) *Policy {
-	return NewWithConfigPath(collection, "", "", netMon, logf)
+	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"
@@ -117,6 +118,7 @@ func restartResolved() error {
 // or as cleanup if the program terminates unexpectedly.
 type directManager struct {
 	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
@@ -140,14 +142,15 @@ type directManager struct {
 }
 
 //lint:ignore U1000 used in manager_{freebsd,openbsd}.go
-func newDirectManager(logf logger.Logf) *directManager {
+func newDirectManager(logf logger.Logf, health *health.Tracker) *directManager {
-	return newDirectManagerOnFS(logf, directFS{})
+	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

@@ -43,6 +43,7 @@ const maxActiveQueries = 256
 // Manager manages system DNS settings.
 type Manager struct {
 	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) {
+func NewOSConfigurator(logger.Logf, *health.Tracker, 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.
 	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) {
+func NewOSConfigurator(logf logger.Logf, health *health.Tracker, interfaceName string) (OSConfigurator, error) {
-	return newOSConfigurator(logf, interfaceName,
+	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

@@ -64,12 +64,13 @@ type resolvedManager struct {
 	cancel func() // terminate the context, for close
 
 	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
@@ -83,6 +84,7 @@ func newResolvedManager(logf logger.Logf, interfaceName string) (*resolvedManage
 		cancel: cancel,
 
 		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"
 )
@@ -55,11 +56,13 @@ func wslDistros() ([]string, error) {
 // It configures /etc/wsl.conf and /etc/resolv.conf.
 type wslManager struct {
 	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,
+		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"
@@ -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
 	}
 
@@ -514,7 +516,6 @@ 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,
@@ -627,7 +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
 	}
@@ -658,7 +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/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) {
+func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
-	return newUserspaceBSDRouter(logf, tundev, netMon)
+	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) {
+func newUserspaceRouter(logf logger.Logf, tundev tun.Device, netMon *netmon.Monitor, health *health.Tracker) (Router, error) {
-	return newUserspaceBSDRouter(logf, tundev, netMon)
+	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

@@ -341,7 +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)
@@ -966,7 +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)