Exemplo n.º 1
0
func main() {
	flag.Parse()
	if flag.NArg() != 1 {
		fmt.Fprintf(os.Stderr, "usage: mutate program\n")
		os.Exit(1)
	}
	data, err := ioutil.ReadFile(flag.Arg(0))
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to read prog file: %v\n", err)
		os.Exit(1)
	}
	p, err := prog.Deserialize(data)
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to deserialize the program: %v\n", err)
		os.Exit(1)
	}

	prios := prog.CalculatePriorities(nil)
	ct := prog.BuildChoiceTable(prios, nil)

	seed := time.Now().UnixNano()
	if *flagSeed != -1 {
		seed = int64(*flagSeed)
	}
	rs := rand.NewSource(seed)
	p.Mutate(rs, len(p.Calls)+10, ct)
	fmt.Printf("%s\n", p.Serialize())
}
Exemplo n.º 2
0
func main() {
	flag.Parse()
	corpus := readCorpus()
	log.Printf("parsed %v programs", len(corpus))

	calls := buildCallList()
	prios := prog.CalculatePriorities(corpus)
	ct := prog.BuildChoiceTable(prios, calls)

	var flags uint64
	if *flagThreaded {
		flags |= ipc.FlagThreaded
	}
	if *flagCollide {
		flags |= ipc.FlagCollide
	}
	if *flagNobody {
		flags |= ipc.FlagDropPrivs
	}
	if *flagDebug {
		flags |= ipc.FlagDebug
	}
	if *flagNoPgid {
		flags |= ipc.FlagNoSetpgid
	}

	gate = ipc.NewGate(2 * *flagProcs)
	for pid := 0; pid < *flagProcs; pid++ {
		pid := pid
		go func() {
			env, err := ipc.MakeEnv(*flagExecutor, *flagTimeout, flags)
			if err != nil {
				failf("failed to create execution environment: %v", err)
			}
			rs := rand.NewSource(time.Now().UnixNano() + int64(pid)*1e12)
			rnd := rand.New(rs)
			for i := 0; ; i++ {
				var p *prog.Prog
				if len(corpus) == 0 || i%4 != 0 {
					p = prog.Generate(rs, programLength, ct)
					execute(pid, env, p)
					p.Mutate(rs, programLength, ct)
					execute(pid, env, p)
				} else {
					p = corpus[rnd.Intn(len(corpus))].Clone()
					p.Mutate(rs, programLength, ct)
					execute(pid, env, p)
					p.Mutate(rs, programLength, ct)
					execute(pid, env, p)
				}
			}
		}()
	}
	for range time.NewTicker(5 * time.Second).C {
		log.Printf("executed %v programs", atomic.LoadUint64(&statExec))
	}
}
Exemplo n.º 3
0
func main() {
	flag.Parse()
	corpus := readCorpus()
	Logf(0, "parsed %v programs", len(corpus))

	calls := buildCallList()
	prios := prog.CalculatePriorities(corpus)
	ct := prog.BuildChoiceTable(prios, calls)

	flags, timeout, err := ipc.DefaultFlags()
	if err != nil {
		Fatalf("%v", err)
	}
	gate = ipc.NewGate(2**flagProcs, nil)
	for pid := 0; pid < *flagProcs; pid++ {
		pid := pid
		go func() {
			env, err := ipc.MakeEnv(*flagExecutor, timeout, flags, pid)
			if err != nil {
				Fatalf("failed to create execution environment: %v", err)
			}
			rs := rand.NewSource(time.Now().UnixNano() + int64(pid)*1e12)
			rnd := rand.New(rs)
			for i := 0; ; i++ {
				var p *prog.Prog
				if len(corpus) == 0 || i%4 != 0 {
					p = prog.Generate(rs, programLength, ct)
					execute(pid, env, p)
					p.Mutate(rs, programLength, ct, corpus)
					execute(pid, env, p)
				} else {
					p = corpus[rnd.Intn(len(corpus))].Clone()
					p.Mutate(rs, programLength, ct, corpus)
					execute(pid, env, p)
					p.Mutate(rs, programLength, ct, corpus)
					execute(pid, env, p)
				}
			}
		}()
	}
	for range time.NewTicker(5 * time.Second).C {
		Logf(0, "executed %v programs", atomic.LoadUint64(&statExec))
	}
}
Exemplo n.º 4
0
func main() {
	debug.SetGCPercent(50)
	flag.Parse()
	logf(0, "started")

	var calls []*sys.Call
	if *flagSyscalls != "" {
		for _, id := range strings.Split(*flagSyscalls, ",") {
			n, err := strconv.ParseUint(id, 10, 64)
			if err != nil || n >= uint64(len(sys.Calls)) {
				panic(fmt.Sprintf("invalid syscall in -calls flag: '%v", id))
			}
			calls = append(calls, sys.Calls[n])
		}
	}

	corpusCover = make([]cover.Cover, sys.CallCount)
	maxCover = make([]cover.Cover, sys.CallCount)
	corpusHashes = make(map[Sig]struct{})

	conn, err := rpc.Dial("tcp", *flagManager)
	if err != nil {
		panic(err)
	}
	manager = conn
	a := &ManagerConnectArgs{*flagName}
	r := &ManagerConnectRes{}
	if err := manager.Call("Manager.Connect", a, r); err != nil {
		panic(err)
	}
	ct = prog.BuildChoiceTable(r.Prios, calls)

	flags := ipc.FlagCover | ipc.FlagDedupCover
	if *flagStrace {
		flags |= ipc.FlagStrace
	}
	env, err := ipc.MakeEnv(*flagExecutor, 4*time.Second, flags)
	if err != nil {
		panic(err)
	}
	rs := rand.NewSource(time.Now().UnixNano())
	rnd := rand.New(rs)
	var lastPoll time.Time
	var lastPrint time.Time
	for i := 0; ; i++ {
		if !*flagSaveProg && time.Since(lastPrint) > 10*time.Second {
			// Keep-alive for manager.
			logf(0, "#%v: alive", i)
			lastPrint = time.Now()
		}
		if len(triage) != 0 {
			last := len(triage) - 1
			inp := triage[last]
			triage = triage[:last]
			logf(1, "#%v: triaging : %s", i, inp.p)
			triageInput(env, inp)
			continue
		}
		if time.Since(lastPoll) > 10*time.Second {
			a := &ManagerPollArgs{*flagName}
			r := &ManagerPollRes{}
			if err := manager.Call("Manager.Poll", a, r); err != nil {
				panic(err)
			}
			for _, inp := range r.NewInputs {
				addInput(inp)
			}
			for _, data := range r.Candidates {
				p, err := prog.Deserialize(data)
				if err != nil {
					panic(err)
				}
				execute(env, p)
			}
			if len(r.NewInputs) == 0 && len(r.Candidates) == 0 {
				lastPoll = time.Now()
			}
			continue
		}
		if len(corpus) == 0 || i%10 == 0 {
			p := prog.Generate(rnd, programLength, ct)
			logf(1, "#%v: generated: %s", i, p)
			execute(env, p)
			p.Mutate(rnd, programLength, ct)
			logf(1, "#%v: mutated: %s", i, p)
			execute(env, p)
		} else {
			inp := corpus[rnd.Intn(len(corpus))]
			p := inp.p.Clone()
			p.Mutate(rs, programLength, ct)
			logf(1, "#%v: mutated: %s <- %s", i, p, inp.p)
			execute(env, p)
		}
	}
}
Exemplo n.º 5
0
func main() {
	debug.SetGCPercent(50)
	flag.Parse()
	switch *flagOutput {
	case "none", "stdout", "dmesg", "file":
	default:
		fmt.Fprintf(os.Stderr, "-output flag must be one of none/stdout/dmesg/file\n")
		os.Exit(1)
	}
	logf(0, "started")

	corpusCover = make([]cover.Cover, sys.CallCount)
	maxCover = make([]cover.Cover, sys.CallCount)
	corpusHashes = make(map[Sig]struct{})

	logf(0, "dialing manager at %v", *flagManager)
	conn, err := jsonrpc.Dial("tcp", *flagManager)
	if err != nil {
		panic(err)
	}
	manager = conn
	a := &ConnectArgs{*flagName}
	r := &ConnectRes{}
	if err := manager.Call("Manager.Connect", a, r); err != nil {
		panic(err)
	}
	calls := buildCallList(r.EnabledCalls)
	ct := prog.BuildChoiceTable(r.Prios, calls)

	kmemleakInit()

	flags, timeout := ipc.DefaultFlags()
	noCover = flags&ipc.FlagCover == 0
	if !noCover {
		fd, err := syscall.Open("/sys/kernel/debug/kcov", syscall.O_RDWR, 0)
		if err != nil {
			log.Fatalf("BUG: /sys/kernel/debug/kcov is missing (%v). Enable CONFIG_KCOV and mount debugfs.", err)
		}
		syscall.Close(fd)
	}
	gate = ipc.NewGate(2 * *flagProcs)
	envs := make([]*ipc.Env, *flagProcs)
	for pid := 0; pid < *flagProcs; pid++ {
		env, err := ipc.MakeEnv(*flagExecutor, timeout, flags)
		if err != nil {
			panic(err)
		}
		envs[pid] = env

		pid := pid
		go func() {
			rs := rand.NewSource(time.Now().UnixNano() + int64(pid)*1e12)
			rnd := rand.New(rs)

			for i := 0; ; i++ {
				triageMu.RLock()
				if len(triage) != 0 || len(candidates) != 0 {
					triageMu.RUnlock()
					triageMu.Lock()
					if len(triage) != 0 {
						last := len(triage) - 1
						inp := triage[last]
						triage = triage[:last]
						triageMu.Unlock()
						logf(1, "triaging : %s", inp.p)
						triageInput(pid, env, inp)
						continue
					} else if len(candidates) != 0 {
						last := len(candidates) - 1
						p := candidates[last]
						candidates = candidates[:last]
						triageMu.Unlock()
						execute(pid, env, p, &statExecCandidate)
						continue
					} else {
						triageMu.Unlock()
					}
				} else {
					triageMu.RUnlock()
				}

				corpusMu.RLock()
				if len(corpus) == 0 || i%10 == 0 {
					corpusMu.RUnlock()
					p := prog.Generate(rnd, programLength, ct)
					logf(1, "#%v: generated: %s", i, p)
					execute(pid, env, p, &statExecGen)
					p.Mutate(rnd, programLength, ct)
					logf(1, "#%v: mutated: %s", i, p)
					execute(pid, env, p, &statExecFuzz)
				} else {
					p0 := corpus[rnd.Intn(len(corpus))]
					corpusMu.RUnlock()
					p := p0.Clone()
					p.Mutate(rs, programLength, ct)
					logf(1, "#%v: mutated: %s <- %s", i, p, p0)
					execute(pid, env, p, &statExecFuzz)
				}
			}
		}()
	}

	var lastPoll time.Time
	var lastPrint time.Time
	for range time.NewTicker(3 * time.Second).C {
		if *flagOutput != "stdout" && time.Since(lastPrint) > 10*time.Second {
			// Keep-alive for manager.
			logf(0, "alive")
			lastPrint = time.Now()
		}
		if time.Since(lastPoll) > 10*time.Second {
			triageMu.RLock()
			if len(candidates) != 0 {
				triageMu.RUnlock()
				continue
			}
			triageMu.RUnlock()

			a := &PollArgs{
				Name:  *flagName,
				Stats: make(map[string]uint64),
			}
			for _, env := range envs {
				a.Stats["exec total"] += atomic.SwapUint64(&env.StatExecs, 0)
				a.Stats["executor restarts"] += atomic.SwapUint64(&env.StatRestarts, 0)
			}
			a.Stats["exec gen"] = atomic.SwapUint64(&statExecGen, 0)
			a.Stats["exec fuzz"] = atomic.SwapUint64(&statExecFuzz, 0)
			a.Stats["exec candidate"] = atomic.SwapUint64(&statExecCandidate, 0)
			a.Stats["exec triage"] = atomic.SwapUint64(&statExecTriage, 0)
			a.Stats["exec minimize"] = atomic.SwapUint64(&statExecMinimize, 0)
			a.Stats["fuzzer new inputs"] = atomic.SwapUint64(&statNewInput, 0)
			r := &PollRes{}
			if err := manager.Call("Manager.Poll", a, r); err != nil {
				panic(err)
			}
			for _, inp := range r.NewInputs {
				addInput(inp)
			}
			for _, data := range r.Candidates {
				p, err := prog.Deserialize(data)
				if err != nil {
					panic(err)
				}
				if noCover {
					corpusMu.Lock()
					corpus = append(corpus, p)
					corpusMu.Unlock()
				} else {
					triageMu.Lock()
					candidates = append(candidates, p)
					triageMu.Unlock()
				}
			}
			if len(r.Candidates) == 0 {
				if atomic.LoadUint32(&allTriaged) == 0 {
					if *flagLeak {
						kmemleakScan(false)
					}
					atomic.StoreUint32(&allTriaged, 1)
				}
			}
			if len(r.NewInputs) == 0 && len(r.Candidates) == 0 {
				lastPoll = time.Now()
			}
		}
	}
}
Exemplo n.º 6
0
func main() {
	debug.SetGCPercent(50)
	flag.Parse()
	logf(0, "started")

	var calls []*sys.Call
	if *flagSyscalls != "" {
		for _, id := range strings.Split(*flagSyscalls, ",") {
			n, err := strconv.ParseUint(id, 10, 64)
			if err != nil || n >= uint64(len(sys.Calls)) {
				panic(fmt.Sprintf("invalid syscall in -calls flag: '%v", id))
			}
			calls = append(calls, sys.Calls[n])
		}
	}

	corpusCover = make([]cover.Cover, sys.CallCount)
	maxCover = make([]cover.Cover, sys.CallCount)
	corpusHashes = make(map[Sig]struct{})

	conn, err := rpc.Dial("tcp", *flagManager)
	if err != nil {
		panic(err)
	}
	manager = conn
	a := &ManagerConnectArgs{*flagName}
	r := &ManagerConnectRes{}
	if err := manager.Call("Manager.Connect", a, r); err != nil {
		panic(err)
	}
	ct = prog.BuildChoiceTable(r.Prios, calls)

	if *flagParallel <= 0 {
		*flagParallel = 1
	}
	flags := ipc.FlagCover | ipc.FlagDedupCover
	if *flagStrace {
		flags |= ipc.FlagStrace
	}
	workerIn = make(chan *prog.Prog, *flagParallel+10)
	workerOut = make(chan []Input, *flagParallel)
	for i := 0; i < *flagParallel; i++ {
		env, err := ipc.MakeEnv(*flagExecutor, 4*time.Second, flags)
		if err != nil {
			panic(err)
		}
		workerId := i + 1
		go func() {
			for p := range workerIn {
				workerOut <- execute(env, p, workerId)
			}
		}()
	}
	env, err := ipc.MakeEnv(*flagExecutor, 4*time.Second, flags)
	if err != nil {
		panic(err)
	}
	rs := rand.NewSource(time.Now().UnixNano())
	rnd := rand.New(rs)
	var lastPoll time.Time
	var lastPrint time.Time
	secondTicker := time.NewTicker(100 * time.Millisecond).C
	for i := 0; ; i++ {
		if !*flagSaveProg && time.Since(lastPrint) > 10*time.Second {
			// Keep-alive for manager.
			logf(0, "#%v: alive", i)
			lastPrint = time.Now()
		}
		if len(triage) != 0 {
			last := len(triage) - 1
			inp := triage[last]
			triage = triage[:last]
			logf(1, "#%v: triaging : %s", i, inp.p)
			triageInput(env, inp)
			continue
		}
		if time.Since(lastPoll) > 10*time.Second {
			a := &ManagerPollArgs{*flagName}
			r := &ManagerPollRes{}
			if err := manager.Call("Manager.Poll", a, r); err != nil {
				panic(err)
			}
			for _, inp := range r.NewInputs {
				addInput(inp)
			}
			for _, data := range r.Candidates {
				p, err := prog.Deserialize(data)
				if err != nil {
					panic(err)
				}
				inputs := execute(env, p, 0)
				for _, inp := range inputs {
					call := inp.p.Calls[inp.call].Meta
					maxCover[call.CallID] = cover.Union(maxCover[call.CallID], inp.cover)
					triage = append(triage, inp)
				}
			}
			if len(r.NewInputs) == 0 && len(r.Candidates) == 0 {
				lastPoll = time.Now()
			}
			continue
		}
		// Parallel part.
		pending := 0
		for ; ; i++ {
			if !(!*flagSaveProg && time.Since(lastPrint) > 10*time.Second) &&
				!(len(triage) != 0) &&
				!(time.Since(lastPoll) > 10*time.Second) {
				// No need to do any work above.
				// Send new inputs to workers, if they need some.
				for len(workerIn) < *flagParallel {
					if len(corpus) == 0 || i%10 == 0 {
						p := prog.Generate(rnd, programLength, ct)
						logf(1, "#%v: generated: %s", i, p)
						workerIn <- p
						pending++
						p = p.Clone()
						p.Mutate(rnd, programLength, ct)
						logf(1, "#%v: mutated: %s", i, p)
						workerIn <- p
						pending++
					} else {
						inp := corpus[rnd.Intn(len(corpus))]
						p := inp.p.Clone()
						p.Mutate(rs, programLength, ct)
						logf(1, "#%v: mutated: %s <- %s", i, p, inp.p)
						workerIn <- p
						pending++
					}
				}
			} else if pending == 0 {
				// Need to do some work above.
				// Break if collected all pending results.
				break
			}
			// Collect results.
			select {
			case inputs := <-workerOut:
				pending--
				for _, inp := range inputs {
					triage = append(triage, inp)
				}
			case <-secondTicker:
			}
		}
		// Do this after the parallel section because workers access maxCover.
		for _, inp := range triage {
			call := inp.p.Calls[inp.call].Meta
			maxCover[call.CallID] = cover.Union(maxCover[call.CallID], inp.cover)
		}
	}
}
Exemplo n.º 7
0
func main() {
	debug.SetGCPercent(50)
	flag.Parse()
	switch *flagOutput {
	case "none", "stdout", "dmesg", "file":
	default:
		fmt.Fprintf(os.Stderr, "-output flag must be one of none/stdout/dmesg/file\n")
		os.Exit(1)
	}
	Logf(0, "fuzzer started")

	go func() {
		// Handles graceful preemption on GCE.
		c := make(chan os.Signal, 1)
		signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
		<-c
		Logf(0, "SYZ-FUZZER: PREEMPTED")
		os.Exit(1)
	}()

	corpusCover = make([]cover.Cover, sys.CallCount)
	maxCover = make([]cover.Cover, sys.CallCount)
	corpusHashes = make(map[Sig]struct{})

	Logf(0, "dialing manager at %v", *flagManager)
	conn, err := jsonrpc.Dial("tcp", *flagManager)
	if err != nil {
		panic(err)
	}
	manager = conn
	a := &ConnectArgs{*flagName}
	r := &ConnectRes{}
	if err := manager.Call("Manager.Connect", a, r); err != nil {
		panic(err)
	}
	calls := buildCallList(r.EnabledCalls)
	ct := prog.BuildChoiceTable(r.Prios, calls)

	if r.NeedCheck {
		a := &CheckArgs{Name: *flagName}
		if fd, err := syscall.Open("/sys/kernel/debug/kcov", syscall.O_RDWR, 0); err == nil {
			syscall.Close(fd)
			a.Kcov = true
		}
		for c := range calls {
			a.Calls = append(a.Calls, c.Name)
		}
		if err := manager.Call("Manager.Check", a, nil); err != nil {
			panic(err)
		}
	}

	kmemleakInit()

	flags, timeout, err := ipc.DefaultFlags()
	if err != nil {
		panic(err)
	}
	if _, ok := calls[sys.CallMap["syz_emit_ethernet"]]; ok {
		flags |= ipc.FlagEnableTun
	}
	noCover = flags&ipc.FlagCover == 0
	leakCallback := func() {
		if atomic.LoadUint32(&allTriaged) != 0 {
			// Scan for leaks once in a while (it is damn slow).
			kmemleakScan(true)
		}
	}
	if !*flagLeak {
		leakCallback = nil
	}
	gate = ipc.NewGate(2**flagProcs, leakCallback)
	needPoll := make(chan struct{}, 1)
	needPoll <- struct{}{}
	envs := make([]*ipc.Env, *flagProcs)
	for pid := 0; pid < *flagProcs; pid++ {
		env, err := ipc.MakeEnv(*flagExecutor, timeout, flags, pid)
		if err != nil {
			panic(err)
		}
		envs[pid] = env

		pid := pid
		go func() {
			rs := rand.NewSource(time.Now().UnixNano() + int64(pid)*1e12)
			rnd := rand.New(rs)

			for i := 0; ; i++ {
				triageMu.RLock()
				if len(triage) != 0 || len(candidates) != 0 {
					triageMu.RUnlock()
					triageMu.Lock()
					if len(triage) != 0 {
						last := len(triage) - 1
						inp := triage[last]
						triage = triage[:last]
						wakePoll := len(triage) < *flagProcs
						triageMu.Unlock()
						if wakePoll {
							select {
							case needPoll <- struct{}{}:
							default:
							}
						}
						Logf(1, "triaging : %s", inp.p)
						triageInput(pid, env, inp)
						continue
					} else if len(candidates) != 0 {
						last := len(candidates) - 1
						p := candidates[last]
						candidates = candidates[:last]
						triageMu.Unlock()
						execute(pid, env, p, &statExecCandidate)
						continue
					} else {
						triageMu.Unlock()
					}
				} else {
					triageMu.RUnlock()
				}

				corpusMu.RLock()
				if len(corpus) == 0 || i%10 == 0 {
					// Generate a new prog.
					corpusMu.RUnlock()
					p := prog.Generate(rnd, programLength, ct)
					Logf(1, "#%v: generated: %s", i, p)
					execute(pid, env, p, &statExecGen)
					p.Mutate(rnd, programLength, ct, nil)
					Logf(1, "#%v: mutated: %s", i, p)
					execute(pid, env, p, &statExecFuzz)
				} else {
					// Mutate an existing prog.
					p0 := corpus[rnd.Intn(len(corpus))]
					p := p0.Clone()
					p.Mutate(rs, programLength, ct, corpus)
					corpusMu.RUnlock()
					Logf(1, "#%v: mutated: %s <- %s", i, p, p0)
					execute(pid, env, p, &statExecFuzz)
				}
			}
		}()
	}

	var lastPoll time.Time
	var lastPrint time.Time
	ticker := time.NewTicker(3 * time.Second).C
	for {
		poll := false
		select {
		case <-ticker:
		case <-needPoll:
			poll = true
		}
		if *flagOutput != "stdout" && time.Since(lastPrint) > 10*time.Second {
			// Keep-alive for manager.
			Logf(0, "alive")
			lastPrint = time.Now()
		}
		if poll || time.Since(lastPoll) > 10*time.Second {
			triageMu.RLock()
			if len(candidates) > *flagProcs {
				triageMu.RUnlock()
				continue
			}
			triageMu.RUnlock()

			a := &PollArgs{
				Name:  *flagName,
				Stats: make(map[string]uint64),
			}
			for _, env := range envs {
				a.Stats["exec total"] += atomic.SwapUint64(&env.StatExecs, 0)
				a.Stats["executor restarts"] += atomic.SwapUint64(&env.StatRestarts, 0)
			}
			a.Stats["exec gen"] = atomic.SwapUint64(&statExecGen, 0)
			a.Stats["exec fuzz"] = atomic.SwapUint64(&statExecFuzz, 0)
			a.Stats["exec candidate"] = atomic.SwapUint64(&statExecCandidate, 0)
			a.Stats["exec triage"] = atomic.SwapUint64(&statExecTriage, 0)
			a.Stats["exec minimize"] = atomic.SwapUint64(&statExecMinimize, 0)
			a.Stats["fuzzer new inputs"] = atomic.SwapUint64(&statNewInput, 0)
			r := &PollRes{}
			if err := manager.Call("Manager.Poll", a, r); err != nil {
				panic(err)
			}
			for _, inp := range r.NewInputs {
				addInput(inp)
			}
			for _, data := range r.Candidates {
				p, err := prog.Deserialize(data)
				if err != nil {
					panic(err)
				}
				if noCover {
					corpusMu.Lock()
					corpus = append(corpus, p)
					corpusMu.Unlock()
				} else {
					triageMu.Lock()
					candidates = append(candidates, p)
					triageMu.Unlock()
				}
			}
			if len(r.Candidates) == 0 && atomic.LoadUint32(&allTriaged) == 0 {
				if *flagLeak {
					kmemleakScan(false)
				}
				atomic.StoreUint32(&allTriaged, 1)
			}
			if len(r.NewInputs) == 0 && len(r.Candidates) == 0 {
				lastPoll = time.Now()
			}
		}
	}
}