fix build

This reverts commit 68105841c6.

Makefile

@@ -20,7 +20,7 @@ ifndef DIR
 	@echo variable DIR unset
 	false
 endif
-	go install github.com/gokrazy/tools/cmd/gokr-packer
+	go install github.com/gokrazy/tools/cmd/gokr-packer@latest
 	GOARCH=amd64 gokr-packer \
 		-gokrazy_pkgs=github.com/gokrazy/gokrazy/cmd/ntp,github.com/gokrazy/gokrazy/cmd/randomd \
 		-kernel_package=github.com/rtr7/kernel \
@@ -35,8 +35,8 @@ endif
 
 recover: #test
 	go install \
-		github.com/gokrazy/tools/cmd/gokr-packer \
-		github.com/rtr7/tools/cmd/rtr7-recover
+		github.com/gokrazy/tools/cmd/gokr-packer@lastet \
+		github.com/rtr7/tools/cmd/rtr7-recover@latest
 	GOARCH=amd64 gokr-packer \
 		-gokrazy_pkgs=github.com/gokrazy/gokrazy/cmd/ntp,github.com/gokrazy/gokrazy/cmd/randomd \
 		-kernel_package=github.com/rtr7/kernel \
@@ -70,7 +70,7 @@ strace:
 	(cd /tmp && go test -c router7) && ${SUDO} strace -f -o /tmp/st -s 2048 /tmp/router7.test -test.v #-test.race
 
 update:
-	rtr7-safe-update -build_command='make -C ~/router7 image DIR=$GOKR_DIR'
+	rtr7-safe-update -build_command='make -C ~/go/src/github.com/rtr7/router7 image DIR=$$GOKR_DIR'
 
 # sudo ip link add link enp0s31f6 name macvtap0 type macvtap
 # sudo ip link set macvtap0 address 52:55:00:d1:55:03 up

cmd/dhcp4/dhcp4.go

@@ -17,11 +17,14 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
+	"errors"
 	"flag"
 	"fmt"
 	"io/ioutil"
 	"net"
+	"net/http"
 	"os"
 	"os/signal"
 	"path"
@@ -48,6 +51,45 @@ var (
 	perm         = flag.String("perm", "/perm", "path to replace /perm")
 )
 
+func healthy() error {
+	req, err := http.NewRequest("GET", "http://localhost:7733/health.json", nil)
+	if err != nil {
+		return err
+	}
+	ctx, canc := context.WithTimeout(context.Background(), 5*time.Second)
+	defer canc()
+	req = req.WithContext(ctx)
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if got, want := resp.StatusCode, http.StatusOK; got != want {
+		b, _ := ioutil.ReadAll(resp.Body)
+		return fmt.Errorf("%v: got HTTP %v (%s), want HTTP status %v",
+			req.URL.String(),
+			resp.Status,
+			string(b),
+			want)
+	}
+	b, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+	var reply struct {
+		FirstError string `json:"first_error"`
+	}
+	if err := json.Unmarshal(b, &reply); err != nil {
+		return err
+	}
+
+	if reply.FirstError != "" {
+		return errors.New(reply.FirstError)
+	}
+
+	return nil
+}
+
 func logic() error {
 	leasePath := filepath.Join(*stateDir, "wire/lease.json")
 	if err := os.MkdirAll(filepath.Dir(leasePath), 0755); err != nil {
@@ -94,6 +136,7 @@ func logic() error {
 		Min:    10 * time.Second,
 		Max:    1 * time.Minute,
 	}
+ObtainOrRenew:
 	for c.ObtainOrRenew() {
 		if err := c.Err(); err != nil {
 			dur := backoff.Duration()
@@ -124,17 +167,44 @@ func logic() error {
 		if err := notify.Process(path.Join(path.Dir(os.Args[0]), "/netconfigd"), syscall.SIGUSR1); err != nil {
 			log.Printf("notifying netconfig: %v", err)
 		}
+
+		unhealthyCycles := 0
+		for {
 			select {
 			case <-time.After(time.Until(c.Config().RenewAfter)):
 				// fallthrough and renew the DHCP lease
+				continue ObtainOrRenew
+
+			case <-time.After(1 * time.Minute):
+				if err := healthy(); err == nil {
+					unhealthyCycles = 0
+					continue // wait another minute
+				} else {
+					unhealthyCycles++
+					log.Printf("router unhealthy (cycle %d of 5): %v", unhealthyCycles, err)
+					if unhealthyCycles < 5 {
+						continue // wait until unhealthy for longer
+					}
+					// fallthrough
+				}
+				// Still not healthy? Drop DHCP lease and start from scratch.
+				log.Printf("unhealthy for 5 cycles, starting over without lease")
+				c.Ack = nil
+
 			case <-usr2:
 				log.Printf("SIGUSR2 received, sending DHCPRELEASE")
 				if err := c.Release(); err != nil {
 					return err
 				}
+				// Ensure dhcp4 does start from scratch next time
+				// by deleting the DHCPACK file:
+				if err := os.Remove(ackFn); err != nil && !os.IsNotExist(err) {
+					return err
+				}
 				os.Exit(125) // quit supervision by gokrazy
 			}
 		}
+	}
 	return c.Err() // permanent error
 }
 

cmd/dhcp4d/dhcp4d.go

@@ -239,6 +239,8 @@ type srv struct {
 }
 
 func newSrv(permDir string) (*srv, error) {
+	mayqtt := MQTT()
+
 	http.Handle("/metrics", promhttp.Handler())
 	if err := updateListeners(); err != nil {
 		return nil, err
@@ -304,7 +306,10 @@ func newSrv(permDir string) (*srv, error) {
 			http.Error(w, "missing hostname parameter", http.StatusBadRequest)
 			return
 		}
-		handler.SetHostname(hwaddr, hostname)
+		if err := handler.SetHostname(hwaddr, hostname); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
 		http.Redirect(w, r, "/", http.StatusFound)
 	})
 
@@ -421,6 +426,38 @@ func newSrv(permDir string) (*srv, error) {
 		if err := notify.Process(path.Join(path.Dir(os.Args[0]), "/dnsd"), syscall.SIGUSR1); err != nil {
 			log.Printf("notifying dnsd: %v", err)
 		}
+
+		// Publish the DHCP lease as JSON to MQTT, if configured:
+		leaseVal := struct {
+			Addr         string    `json:"addr"`
+			HardwareAddr string    `json:"hardware_addr"`
+			Expiration   time.Time `json:"expiration"`
+		}{
+			Addr:         latest.Addr.String(),
+			HardwareAddr: latest.HardwareAddr,
+			Expiration:   latest.Expiry.In(time.UTC),
+		}
+		leaseJSON, err := json.Marshal(leaseVal)
+		if err != nil {
+			log.Fatal(err)
+		}
+		// MQTT requires valid UTF-8 and some brokers don’t cope well with
+		// invalid UTF-8: https://github.com/fhmq/hmq/issues/104
+		identifier := strings.ToValidUTF8(latest.Hostname, "")
+		if identifier == "" {
+			identifier = latest.HardwareAddr
+		}
+		select {
+		case mayqtt <- PublishRequest{
+			Topic:    "router7/dhcp4d/lease/" + identifier,
+			Retained: true,
+			Payload:  leaseJSON,
+		}:
+		default:
+			// Channel not ready? skip publishing this lease (best-effort).
+			// This is an easy way of breaking circular dependencies between
+			// MQTT broker and DHCP server, and avoiding deadlocks.
+		}
 	}
 	conn, err := conn.NewUDP4BoundListener(*iface, ":67")
 	if err != nil {

cmd/dhcp4d/mayqtt.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"strings"
+
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+)
+
+type PublishRequest struct {
+	Topic    string
+	Qos      byte
+	Retained bool
+	Payload  interface{}
+}
+
+func publisherLoop(requests <-chan PublishRequest) error {
+	const configFn = "/perm/dhcp4d/mqtt-broker.txt"
+	b, err := ioutil.ReadFile(configFn)
+	if err != nil {
+		// discard requests:
+		for range requests {
+		}
+		return nil
+	}
+	// e.g. tcp://10.0.0.54:1883, which is a static DHCP lease for the dr.lan
+	// Raspberry Pi, which is running an MQTT broker in my network.
+	broker := strings.TrimSpace(string(b))
+	log.Printf("Connecting to MQTT broker %q (configured in %s)", broker, configFn)
+	opts := mqtt.NewClientOptions().AddBroker(broker)
+	opts.SetClientID("dhcp4d")
+	opts.SetConnectRetry(true)
+	mqttClient := mqtt.NewClient(opts)
+	if token := mqttClient.Connect(); token.Wait() && token.Error() != nil {
+		return fmt.Errorf("MQTT connection failed: %v", token.Error())
+	}
+
+	for r := range requests {
+		// discard Token, MQTT publishing is best-effort
+		_ = mqttClient.Publish(r.Topic, r.Qos, r.Retained, r.Payload)
+	}
+	return nil
+}
+
+func MQTT() chan<- PublishRequest {
+	result := make(chan PublishRequest)
+	go func() {
+		if err := publisherLoop(result); err != nil {
+			log.Print(err)
+		}
+	}()
+	return result
+}

cmd/diagd/diagd.go

@@ -34,12 +34,12 @@ import (
 
 	"github.com/rtr7/router7/internal/diag"
 	"github.com/rtr7/router7/internal/multilisten"
+
+	_ "net/http/pprof"
 )
 
 var httpListeners = multilisten.NewPool()
 
-var perm = flag.String("perm", "/perm", "path to replace /perm")
-
 func updateListeners() error {
 	hosts, err := gokrazy.PrivateInterfaceAddrs()
 	if err != nil {
@@ -81,10 +81,20 @@ func firstError(re *diag.EvalResult) string {
 }
 
 func logic() error {
+	var (
+		ifname = flag.String("interface",
+			"uplink0",
+			"interface name to query")
+		perm = flag.String("perm",
+			"/perm",
+			"path to replace /perm")
+	)
 	const (
-		uplink        = "uplink0" /* enp0s31f6 */
 		ip6allrouters = "ff02::2" // no /etc/hosts on gokrazy
 	)
+	flag.Parse()
+	uplink := *ifname
+	diag.Perm = *perm
 	m := diag.NewMonitor(diag.Link(uplink).
 		Then(diag.DHCPv4().
 			Then(diag.Ping4Gateway().
@@ -135,9 +145,6 @@ func logic() error {
 }
 
 func main() {
-	flag.Parse()
-	diag.Perm = *perm
-
 	if err := logic(); err != nil {
 		log.Fatal(err)
 	}

cmd/dnsd/dnsd.go

@@ -40,19 +40,20 @@ import (
 
 var (
 	httpListeners   = multilisten.NewPool()
-	dnsListeners  = multilisten.NewPool()
+	dnsUDPListeners = multilisten.NewPool()
+	dnsTCPListeners = multilisten.NewPool()
 
 	perm   = flag.String("perm", "/perm", "path to replace /perm")
 	domain = flag.String("domain", "lan", "domain name for your network")
 )
 
 func updateListeners(mux *miekgdns.ServeMux) error {
-	hosts, err := gokrazy.PrivateInterfaceAddrs()
+	privateAddrs, err := gokrazy.PrivateInterfaceAddrs()
 	if err != nil {
 		return err
 	}
 
-	dnsListeners.ListenAndServe(hosts, func(host string) multilisten.Listener {
+	dnsUDPListeners.ListenAndServe(privateAddrs, func(host string) multilisten.Listener {
 		return &listenerAdapter{&miekgdns.Server{
 			Addr:    net.JoinHostPort(host, "53"),
 			Net:     "udp",
@@ -60,11 +61,19 @@ func updateListeners(mux *miekgdns.ServeMux) error {
 		}}
 	})
 
-	if net1, err := multilisten.IPv6Net1(*perm); err == nil {
-		hosts = append(hosts, net1)
+	dnsTCPListeners.ListenAndServe(privateAddrs, func(host string) multilisten.Listener {
+		return &listenerAdapter{&miekgdns.Server{
+			Addr:    net.JoinHostPort(host, "53"),
+			Net:     "tcp",
+			Handler: mux,
+		}}
+	})
+
+	if net1, err := multilisten.IPv6Net1("/perm"); err == nil {
+		privateAddrs = append(privateAddrs, net1)
 	}
 
-	httpListeners.ListenAndServe(hosts, func(host string) multilisten.Listener {
+	httpListeners.ListenAndServe(privateAddrs, func(host string) multilisten.Listener {
 		return &http.Server{Addr: net.JoinHostPort(host, "8053")}
 	})
 

go.mod

@@ -2,41 +2,41 @@ module github.com/rtr7/router7
 
 go 1.13
 
-replace github.com/gokrazy/gokrazy => bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200822174213-684b7f10bbcc
-
 require (
 	github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883
 	github.com/digineo/go-ping v1.0.0
-	github.com/gokrazy/gokrazy v0.0.0-20200801074800-f7c3cb7e0e6a
-	github.com/gokrazy/internal v0.0.0-20200713084155-ab6fc6e02a03 // indirect
-	github.com/google/go-cmp v0.5.0
-	github.com/google/gopacket v1.1.18
-	github.com/google/nftables v0.0.0-20200802175506-c25e4f69b425
-	github.com/google/renameio v0.1.0
-	github.com/insomniacslk/dhcp v0.0.0-20200806210722-3f14f7f8bd9c
+	github.com/eclipse/paho.mqtt.golang v1.3.1
+	github.com/gokrazy/breakglass v0.0.0-20200527163858-efff2172eebe // indirect
+	github.com/gokrazy/gdns v0.0.0-20201230092851-839aed036b72 // indirect
+	github.com/gokrazy/gokrazy v0.0.0-20201006151115-caded4667633
+	github.com/gokrazy/internal v0.0.0-20201230135541-e2046189e529 // indirect
+	github.com/gokrazy/timestamps v0.0.0-20200713073712-54fdc319126e // indirect
+	github.com/google/go-cmp v0.5.4
+	github.com/google/gopacket v1.1.19
+	github.com/google/nftables v0.0.0-20201230142148-715e31cb3c31
+	github.com/google/renameio v1.0.0
+	github.com/insomniacslk/dhcp v0.0.0-20201112113307-4de412bc85d8
 	github.com/jpillora/backoff v1.0.0
-	github.com/kr/text v0.2.0 // indirect
 	github.com/krolaw/dhcp4 v0.0.0-20190909130307-a50d88189771
 	github.com/libdns/cloudflare v0.0.0-20200528144945-97886e7873b1
-	github.com/libdns/libdns v0.0.0-20200501023120-186724ffc821
+	github.com/libdns/libdns v0.1.0
 	github.com/mdlayher/ndp v0.0.0-20200602162440-17ab9e3e5567
+	github.com/mdlayher/netlink v1.2.0 // indirect
 	github.com/mdlayher/raw v0.0.0-20191009151244-50f2db8cc065
-	github.com/miekg/dns v1.1.31
-	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	github.com/prometheus/client_golang v1.7.1
-	github.com/prometheus/common v0.11.1 // indirect
+	github.com/miekg/dns v1.1.35
+	github.com/prometheus/client_golang v1.9.0
 	github.com/rtr7/dhcp4 v0.0.0-20181120124042-778e8c2e24a5
+	github.com/rtr7/kernel v0.0.0-20201230211609-3ff497c07fc8 // indirect
 	github.com/sergi/go-diff v1.1.0 // indirect
-	github.com/u-root/u-root v6.0.0+incompatible // indirect
-	github.com/vishvananda/netlink v1.1.0
-	github.com/vishvananda/netns v0.0.0-20200728191858-db3c7e526aae // indirect
-	golang.org/x/crypto v0.0.0-20200728195943-123391ffb6de
-	golang.org/x/net v0.0.0-20200707034311-ab3426394381
-	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
-	golang.org/x/sys v0.0.0-20200810151505-1b9f1253b3ed
-	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e
-	golang.zx2c4.com/wireguard v0.0.20200320 // indirect
+	github.com/stapelberg/zkj-nas-tools v0.0.0-20201220205852-9750848973e0 // indirect
+	github.com/vishvananda/netlink v1.1.1-0.20200221165523-c79a4b7b4066
+	github.com/vishvananda/netns v0.0.0-20201230012202-c4f3ca719c73 // indirect
+	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
+	golang.org/x/net v0.0.0-20201224014010-6772e930b67b
+	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
+	golang.org/x/sys v0.0.0-20201223074533-0d417f636930
+	golang.org/x/time v0.0.0-20201208040808-7e3f01d25324
+	golang.zx2c4.com/wireguard v0.0.20201118 // indirect
 	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20200609130330-bd2cb7843e1b
 	google.golang.org/protobuf v1.25.0 // indirect
-	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 )

go.sum

@@ -1,9 +1,7 @@
-bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200822174213-684b7f10bbcc h1:8dSoG9r/UydbDre0bV/oWef5zkPZVTf2CuEITPgWXqU=
-bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200822174213-684b7f10bbcc/go.mod h1:gg6WuqKqQT5Ty8vivqW/UUwyinbpjNpiaQJyAHDUquY=
-cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/DATA-DOG/go-txdb v0.1.3/go.mod h1:DhAhxMXZpUJVGnT+p9IbzJoRKvlArO2pkHjnGX7o0n0=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
@@ -16,6 +14,8 @@ github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRF
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883 h1:bvNMNQO63//z+xNgfBlViaCIJKLlCJ6/fmUseuG0wVQ=
 github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
+github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 h1:kFOfPq6dUM1hTo4JG6LR5AXSUEsOjtdm0kw0FtQtMJA=
+github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
@@ -25,6 +25,7 @@ github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6l
 github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
 github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZwxzkQq9wy+g=
+github.com/beevik/ntp v0.2.0 h1:sGsd+kAXzT0bfVfzJfce04g+dSRfrs+tbQW8lweuYgw=
 github.com/beevik/ntp v0.2.0/go.mod h1:hIHWr+l3+/clUnF44zdK+CWW7fO8dR5cIylAQ76NRpg=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
@@ -34,6 +35,7 @@ github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kB
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@@ -44,8 +46,8 @@ github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
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@@ -58,17 +60,28 @@ github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:Htrtb
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@@ -81,9 +94,23 @@ github.com/gogo/googleapis v1.1.0/go.mod h1:gf4bu3Q80BeJ6H1S1vYPm8/ELATdvryBaNFG
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@@ -107,22 +135,31 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
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@@ -148,17 +185,21 @@ github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2p
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@@ -311,6 +380,8 @@ github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4k
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@@ -320,19 +391,27 @@ github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
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@@ -405,9 +495,11 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
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@@ -465,13 +580,14 @@ golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtn
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@@ -508,9 +624,8 @@ gopkg.in/DATA-DOG/go-sqlmock.v1 v1.3.0/go.mod h1:OdE7CF6DbADk7lN8LIKRzRJTTZXIjtW
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@@ -524,8 +639,9 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

integration/netconfig/netconfig_test.go

@@ -471,3 +471,124 @@ func ipLines(args ...string) ([]string, error) {
 
 	return strings.Split(strings.TrimSpace(outstr), "\n"), nil
 }
+
+func TestDHCPv4OldAddressDeconfigured(t *testing.T) {
+	if os.Getenv("HELPER_PROCESS") == "1" {
+		tmp, err := ioutil.TempDir("", "router7")
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer os.RemoveAll(tmp)
+
+		for _, golden := range []struct {
+			filename, content string
+		}{
+			{"dhcp4/wire/lease.json", goldenDhcp4},
+			{"interfaces.json", goldenInterfaces},
+		} {
+			if err := os.MkdirAll(filepath.Join(tmp, filepath.Dir(golden.filename)), 0755); err != nil {
+				t.Fatal(err)
+			}
+			if err := ioutil.WriteFile(filepath.Join(tmp, golden.filename), []byte(golden.content), 0600); err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		if err := os.MkdirAll(filepath.Join(tmp, "root", "etc"), 0755); err != nil {
+			t.Fatal(err)
+		}
+
+		if err := os.MkdirAll(filepath.Join(tmp, "root", "tmp"), 0755); err != nil {
+			t.Fatal(err)
+		}
+
+		if err := netconfig.Apply(tmp, filepath.Join(tmp, "root")); err != nil {
+			t.Fatalf("netconfig.Apply: %v", err)
+		}
+
+		const anotherDhcp4 = `
+{
+  "valid_until":"2018-05-18T23:46:04.429895261+02:00",
+  "client_ip":"85.195.199.99",
+  "subnet_mask":"255.255.255.128",
+  "router":"85.195.199.1",
+  "dns":[
+    "77.109.128.2",
+    "213.144.129.20"
+  ]
+}
+`
+		if err := ioutil.WriteFile(filepath.Join(tmp, "dhcp4/wire/lease.json"), []byte(anotherDhcp4), 0600); err != nil {
+			t.Fatal(err)
+		}
+
+		if err := netconfig.Apply(tmp, filepath.Join(tmp, "root")); err != nil {
+			t.Fatalf("netconfig.Apply: %v", err)
+		}
+
+		return
+	}
+	const ns = "ns5" // name of the network namespace to use for this test
+
+	add := exec.Command("ip", "netns", "add", ns)
+	add.Stderr = os.Stderr
+	if err := add.Run(); err != nil {
+		t.Fatalf("%v: %v", add.Args, err)
+	}
+	defer exec.Command("ip", "netns", "delete", ns).Run()
+
+	nsSetup := []*exec.Cmd{
+		exec.Command("ip", "-netns", ns, "link", "add", "dummy0", "type", "dummy"),
+		exec.Command("ip", "-netns", ns, "link", "add", "lan0", "type", "dummy"),
+		exec.Command("ip", "-netns", ns, "link", "set", "dummy0", "address", "02:73:53:00:ca:fe"),
+		exec.Command("ip", "-netns", ns, "link", "set", "lan0", "address", "02:73:53:00:b0:0c"),
+	}
+
+	for _, cmd := range nsSetup {
+		if err := cmd.Run(); err != nil {
+			t.Fatalf("%v: %v", cmd.Args, err)
+		}
+	}
+
+	cmd := exec.Command("ip", "netns", "exec", ns, os.Args[0], "-test.run=^TestDHCPv4OldAddressDeconfigured$")
+	cmd.Env = append(os.Environ(), "HELPER_PROCESS=1")
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		t.Fatal(err)
+	}
+
+	t.Run("VerifyAddresses", func(t *testing.T) {
+		show := exec.Command("ip", "-netns", ns, "address", "show", "dev", "uplink0")
+		show.Stderr = os.Stderr
+		addrs, err := show.Output()
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		oldAddrRe := regexp.MustCompile(`(?m)^\s*inet 85.195.207.62/25 brd 85.195.207.127 scope global uplink0$`)
+		if oldAddrRe.MatchString(string(addrs)) {
+			t.Fatalf("regexp %s unexpectedly still matches %s", oldAddrRe, string(addrs))
+		}
+
+		addrRe := regexp.MustCompile(`(?m)^\s*inet 85.195.199.99/25 brd 85.195.199.127 scope global uplink0$`)
+		if !addrRe.MatchString(string(addrs)) {
+			t.Fatalf("regexp %s does not match %s", addrRe, string(addrs))
+		}
+
+		wantRoutes := []string{
+			"default via 85.195.199.1 proto dhcp src 85.195.199.99 ",
+			"85.195.199.0/25 proto kernel scope link src 85.195.199.99 ",
+			"85.195.199.1 proto dhcp scope link src 85.195.199.99",
+		}
+
+		routes, err := ipLines("-netns", ns, "route", "show", "dev", "uplink0")
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		if diff := cmp.Diff(wantRoutes, routes); diff != "" {
+			t.Fatalf("routes: diff (-want +got):\n%s", diff)
+		}
+	})
+}

internal/dhcp4/dhcp4.go

@@ -44,6 +44,7 @@ type Client struct {
 
 	err          error
 	once         sync.Once
+	onceErr      error
 	connection   net.PacketConn
 	hardwareAddr net.HardwareAddr
 	hostname     string
@@ -51,8 +52,6 @@ type Client struct {
 	timeNow      func() time.Time
 	generateXID  func() uint32
 
-	timeoutCount int
-
 	// last DHCPACK packet for renewal/release
 	Ack *layers.DHCPv4
 }
@@ -86,7 +85,6 @@ var errNAK = errors.New("received DHCPNAK")
 
 // ObtainOrRenew returns false when encountering a permanent error.
 func (c *Client) ObtainOrRenew() bool {
-	var onceErr error
 	c.once.Do(func() {
 		if c.timeNow == nil {
 			c.timeNow = time.Now
@@ -96,13 +94,13 @@ func (c *Client) ObtainOrRenew() bool {
 				LinuxSockDGRAM: true,
 			})
 			if err != nil {
-				onceErr = err
+				c.onceErr = err
 				return
 			}
 			c.connection = conn
 		}
 		if c.connection == nil && c.Interface == nil {
-			onceErr = fmt.Errorf("c.Interface is nil")
+			c.onceErr = fmt.Errorf("c.Interface is nil")
 			return
 		}
 		if c.hardwareAddr == nil && c.HWAddr != nil {
@@ -117,14 +115,14 @@ func (c *Client) ObtainOrRenew() bool {
 		if c.hostname == "" {
 			var utsname unix.Utsname
 			if err := unix.Uname(&utsname); err != nil {
-				onceErr = err
+				c.onceErr = err
 				return
 			}
 			c.hostname = string(utsname.Nodename[:bytes.IndexByte(utsname.Nodename[:], 0)])
 		}
 	})
-	if onceErr != nil {
-		c.err = onceErr
+	if c.onceErr != nil {
+		c.err = c.onceErr
 		return false // permanent error
 	}
 	c.err = nil // clear previous error
@@ -132,11 +130,9 @@ func (c *Client) ObtainOrRenew() bool {
 	if err != nil {
 		if errno, ok := err.(syscall.Errno); ok && errno == syscall.EAGAIN {
 			c.err = fmt.Errorf("DHCP: timeout (server(s) unreachable)")
-			c.timeoutCount++
 			return true // temporary error
 		}
-		if err == errNAK || c.timeoutCount > 3 {
-			c.timeoutCount = 0
+		if err == errNAK {
 			c.Ack = nil // start over at DHCPDISCOVER
 		}
 		c.err = fmt.Errorf("DHCP: %v", err)

internal/dhcp4d/dhcp4d.go

@@ -111,6 +111,10 @@ func NewHandler(dir string, iface *net.Interface, ifaceName string, conn net.Pac
 		serverIP:   serverIP,
 		start:      start,
 		leaseRange: 230,
+		// Apple recommends a DHCP lease time of 1 hour in
+		// https://support.apple.com/de-ch/HT202068,
+		// so if 20 minutes ever causes any trouble,
+		// we should try increasing it to 1 hour.
 		LeasePeriod: 20 * time.Minute,
 		options:     options,
 		timeNow:     time.Now,
@@ -142,14 +146,18 @@ func (h *Handler) callLeasesLocked(lease *Lease) {
 	h.Leases(leases, lease)
 }
 
-func (h *Handler) SetHostname(hwaddr, hostname string) {
+func (h *Handler) SetHostname(hwaddr, hostname string) error {
 	h.leasesMu.Lock()
 	defer h.leasesMu.Unlock()
 	leaseNum := h.leasesHW[hwaddr]
 	lease := h.leasesIP[leaseNum]
+	if lease.HardwareAddr != hwaddr || lease.Expired(h.timeNow()) {
+		return fmt.Errorf("hwaddr %v does not have a valid lease", hwaddr)
+	}
 	lease.Hostname = hostname
 	lease.HostnameOverride = hostname
 	h.callLeasesLocked(lease)
+	return nil
 }
 
 func (h *Handler) findLease() int {

internal/diag/ping.go

@@ -73,6 +73,7 @@ func (d *ping4gw) Evaluate() (string, error) {
 	if err != nil {
 		return "", err
 	}
+	defer p.Close()
 	rtt, err := p.Ping(addr, timeout)
 	if err != nil {
 		return "", err
@@ -115,6 +116,7 @@ func (d *ping4) Evaluate() (string, error) {
 	if err != nil {
 		return "", err
 	}
+	defer p.Close()
 	rtt, err := p.Ping(addr, timeout)
 	if err != nil {
 		return "", err
@@ -177,6 +179,7 @@ func (d *ping6gw) Evaluate() (string, error) {
 	if err != nil {
 		return "", fmt.Errorf("ping.New(::): %v", err)
 	}
+	defer p.Close()
 	rtt, err := p.Ping(addr, timeout)
 	if err != nil {
 		return "", fmt.Errorf("ping6(%v, %v): %v", addr, timeout, err)
@@ -251,6 +254,7 @@ func (d *ping6) Evaluate() (string, error) {
 	if err != nil {
 		return "", err
 	}
+	defer p.Close()
 	ctx, canc := context.WithTimeout(context.Background(), timeout)
 	defer canc()
 	if strings.HasPrefix(addr.String(), "ff02::") {
@@ -274,6 +278,11 @@ func (d *ping6) Evaluate() (string, error) {
 			if localAddr[reply.Address.String()] {
 				continue
 			}
+			go func() {
+				for range replies {
+					// drain channel
+				}
+			}()
 			return formatRTT(reply.Duration) + " from " + reply.Address.String(), nil
 		}
 		return "", fmt.Errorf("no responses to %s within %v", addr, timeout)

internal/dns/dns.go

@@ -548,7 +548,10 @@ func (s *Server) handleRequest(w dns.ResponseWriter, r *dns.Msg) {
 		if idx > 0 {
 			// re-order this upstream to the front of s.upstream.
 			s.upstreamMu.Lock()
+			// if the upstreams were reordered in the meantime leave them alone
+			if s.upstream[idx] == u {
 				s.upstream = append(append([]string{u}, s.upstream[:idx]...), s.upstream[idx+1:]...)
+			}
 			s.upstreamMu.Unlock()
 		}
 		return

internal/netconfig/netconfig.go

@@ -75,7 +75,8 @@ func applyDhcp4(dir string) error {
 		return err
 	}
 
-	link, err := netlink.LinkByName("uplink0")
+	const linkName = "uplink0"
+	link, err := netlink.LinkByName(linkName)
 	if err != nil {
 		return err
 	}
@@ -89,7 +90,8 @@ func applyDhcp4(dir string) error {
 		return err
 	}
 
-	addr, err := netlink.ParseAddr(fmt.Sprintf("%s/%d", got.ClientIP, subnetSize))
+	gotAddr := fmt.Sprintf("%s/%d", got.ClientIP, subnetSize)
+	addr, err := netlink.ParseAddr(gotAddr)
 	if err != nil {
 		return err
 	}
@@ -99,8 +101,24 @@ func applyDhcp4(dir string) error {
 		return fmt.Errorf("netlink.NewHandle: %v", err)
 	}
 	defer h.Delete()
+	log.Printf("replacing address %v on %v", addr, linkName)
 	if err := h.AddrReplace(link, addr); err != nil {
-		return fmt.Errorf("AddrReplace(%v): %v", addr, err)
+		return fmt.Errorf("AddrReplace(%v, %v): %v", linkName, addr, err)
+	}
+
+	addrs, err := h.AddrList(link, netlink.FAMILY_V4)
+	if err != nil {
+		return fmt.Errorf("AddrList(%v): %v", linkName, err)
+	}
+	for _, addr := range addrs {
+		ipnet := addr.IPNet.String() // e.g. "85.195.199.99/25"
+		if ipnet == gotAddr {
+			continue
+		}
+		log.Printf("de-configuring old IP address %s from %v", ipnet, linkName)
+		if err := h.AddrDel(link, &addr); err != nil {
+			return fmt.Errorf("AddrDel(%v, %v): %v", linkName, addr, err)
+		}
 	}
 
 	// from include/uapi/linux/rtnetlink.h