Golang net.EnsureInterface函数代码示例

func main() {
	if len(os.Args) <= 1 {
		os.Exit(0)
	}

	args := os.Args[1:]
	signalWait := 20
	if args[0] == "-s" {
		signalWait = 0
		args = args[1:]
	}
	interfaceWait := 20 - signalWait

	usr2 := make(chan os.Signal)
	signal.Notify(usr2, syscall.SIGUSR2)
	select {
	case <-usr2:
	case <-time.After(time.Duration(signalWait) * time.Second):
	}
	_, err := net.EnsureInterface("ethwe", interfaceWait)
	checkErr(err)

	binary, err := exec.LookPath(args[0])
	checkErr(err)

	checkErr(syscall.Exec(binary, args, os.Environ()))
}

func main() {
	var (
		args      = os.Args[1:]
		notInExec = true
	)

	if len(args) > 0 && args[0] == "-s" {
		notInExec = false
		args = args[1:]
	}

	if notInExec {
		usr2 := make(chan os.Signal)
		signal.Notify(usr2, syscall.SIGUSR2)
		<-usr2
	}

	_, err := weavenet.EnsureInterface("ethwe", -1)
	checkErr(err)

	if len(args) == 0 {
		checkErr(ErrNoCommandSpecified)
	}

	binary, err := exec.LookPath(args[0])
	checkErr(err)

	checkErr(syscall.Exec(binary, args, os.Environ()))
}

func createOverlay(datapathName string, ifaceName string, isAWSVPC bool, host string, port int, bufSzMB int) (weave.NetworkOverlay, weave.Bridge) {
	overlay := weave.NewOverlaySwitch()
	var bridge weave.Bridge
	var ignoreSleeve bool

	switch {
	case isAWSVPC:
		vpc := weave.NewAWSVPC()
		overlay.Add("awsvpc", vpc)
		bridge = weave.NullBridge{}
		// Currently, we do not support any overlay with AWSVPC
		ignoreSleeve = true
	case datapathName != "" && ifaceName != "":
		Log.Fatal("At most one of --datapath and --iface must be specified.")
	case datapathName != "":
		iface, err := weavenet.EnsureInterface(datapathName)
		checkFatal(err)
		fastdp, err := weave.NewFastDatapath(iface, port)
		checkFatal(err)
		bridge = fastdp.Bridge()
		overlay.Add("fastdp", fastdp.Overlay())
	case ifaceName != "":
		iface, err := weavenet.EnsureInterface(ifaceName)
		checkFatal(err)
		bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024) // bufsz flag is in MB
		checkFatal(err)
	default:
		bridge = weave.NullBridge{}
	}

	if !ignoreSleeve {
		sleeve := weave.NewSleeveOverlay(host, port)
		overlay.Add("sleeve", sleeve)
		overlay.SetCompatOverlay(sleeve)
	}

	return overlay, bridge
}

func NewDiscoveryHTTP(config DiscoveryHTTPConfig) *DiscoveryHTTP {
	var httpIP string
	if config.Iface == "" {
		httpIP = "0.0.0.0"
	} else {
		Log.Infoln("[http] Waiting for HTTP interface", config.Iface, "to come up")
		httpIface, err := weavenet.EnsureInterface(config.Iface, config.Wait)
		if err != nil {
			Log.Fatal(err)
		}
		Log.Infoln("[http] Interface", config.Iface, "is up")

		addrs, err := httpIface.Addrs()
		if err != nil {
			Log.Fatal(err)
		}

		if len(addrs) == 0 {
			Log.Fatal("[http] No addresses on HTTP interface")
		}

		ip, _, err := net.ParseCIDR(addrs[0].String())
		if err != nil {
			Log.Fatal(err)
		}

		httpIP = ip.String()

	}
	httpAddr := net.JoinHostPort(httpIP, strconv.Itoa(config.Port))

	httpListener, err := net.Listen("tcp", httpAddr)
	if err != nil {
		Log.Fatal("[http] Unable to create HTTP listener: ", err)
	}
	Log.Infoln("[http] HTTP API listening on", httpAddr)

	return &DiscoveryHTTP{
		dm:         config.Manager,
		listener:   httpListener,
		defaultHb:  config.Heartbeat,
		defaultTTL: config.TTL,
	}
}

func main() {
	if len(os.Args) <= 1 {
		os.Exit(0)
	}

	var (
		args         = os.Args[1:]
		notInExec    = true
		rewriteHosts = true
	)

	if args[0] == "-s" {
		notInExec = false
		rewriteHosts = false
		args = args[1:]
	}

	if args[0] == "-h" {
		rewriteHosts = false
		args = args[1:]
	}

	if notInExec {
		usr2 := make(chan os.Signal)
		signal.Notify(usr2, syscall.SIGUSR2)
		<-usr2
	}

	iface, err := weavenet.EnsureInterface("ethwe", -1)
	checkErr(err)

	if rewriteHosts {
		updateHosts(iface)
	}

	binary, err := exec.LookPath(args[0])
	checkErr(err)

	checkErr(syscall.Exec(binary, args, os.Environ()))
}

func main() {
	if len(os.Args) <= 1 {
		os.Exit(0)
	}
	args := os.Args[1:]

	if args[0] == "-s" {
		args = args[1:]
	} else {
		usr2 := make(chan os.Signal)
		signal.Notify(usr2, syscall.SIGUSR2)
		<-usr2
	}

	_, err := net.EnsureInterface("ethwe", -1)
	checkErr(err)

	binary, err := exec.LookPath(args[0])
	checkErr(err)

	checkErr(syscall.Exec(binary, args, os.Environ()))
}

func createOverlay(datapathName string, ifaceName string, host string, port int, bufSzMB int) (weave.NetworkOverlay, weave.Bridge) {
	overlay := weave.NewOverlaySwitch()
	var bridge weave.Bridge
	switch {
	case datapathName != "" && ifaceName != "":
		Log.Fatal("At most one of --datapath and --iface must be specified.")
	case datapathName != "":
		fastdp, err := weave.NewFastDatapath(datapathName, port)
		checkFatal(err)
		bridge = fastdp.Bridge()
		overlay.Add("fastdp", fastdp.Overlay())
	case ifaceName != "":
		iface, err := weavenet.EnsureInterface(ifaceName)
		checkFatal(err)
		bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024) // bufsz flag is in MB
		checkFatal(err)
	default:
		bridge = weave.NullBridge{}
	}
	sleeve := weave.NewSleeveOverlay(host, port)
	overlay.Add("sleeve", sleeve)
	overlay.SetCompatOverlay(sleeve)
	return overlay, bridge
}

func checkNetwork() error {
	_, err := weavenet.EnsureInterface(weavenet.VethName)
	return err
}

func main() {
	procs := runtime.NumCPU()
	// packet sniffing can block an OS thread, so we need one thread
	// for that plus at least one more.
	if procs < 2 {
		procs = 2
	}
	runtime.GOMAXPROCS(procs)

	var (
		config             weave.Config
		justVersion        bool
		protocolMinVersion int
		ifaceName          string
		routerName         string
		nickName           string
		password           string
		wait               int
		pktdebug           bool
		logLevel           string
		prof               string
		bufSzMB            int
		noDiscovery        bool
		httpAddr           string
		iprangeCIDR        string
		ipsubnetCIDR       string
		peerCount          int
		apiPath            string
		peers              []string
		noDNS              bool
		dnsDomain          string
		dnsPort            int
		dnsTTL             int
		dnsClientTimeout   time.Duration
	)

	mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
	mflag.IntVar(&config.Port, []string{"#port", "-port"}, weave.Port, "router port")
	mflag.IntVar(&protocolMinVersion, []string{"-min-protocol-version"}, weave.ProtocolMinVersion, "minimum weave protocol version")
	mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to capture/inject from (disabled if blank)")
	mflag.StringVar(&routerName, []string{"#name", "-name"}, "", "name of router (defaults to MAC of interface)")
	mflag.StringVar(&nickName, []string{"#nickname", "-nickname"}, "", "nickname of peer (defaults to hostname)")
	mflag.StringVar(&password, []string{"#password", "-password"}, "", "network password")
	mflag.IntVar(&wait, []string{"#wait", "-wait"}, -1, "number of seconds to wait for interface to come up (0=don't wait, -1=wait forever)")
	mflag.StringVar(&logLevel, []string{"-log-level"}, "info", "logging level (debug, info, warning, error)")
	mflag.BoolVar(&pktdebug, []string{"#pktdebug", "#-pktdebug", "-pkt-debug"}, false, "enable per-packet debug logging")
	mflag.StringVar(&prof, []string{"#profile", "-profile"}, "", "enable profiling and write profiles to given path")
	mflag.IntVar(&config.ConnLimit, []string{"#connlimit", "#-connlimit", "-conn-limit"}, 30, "connection limit (0 for unlimited)")
	mflag.BoolVar(&noDiscovery, []string{"#nodiscovery", "#-nodiscovery", "-no-discovery"}, false, "disable peer discovery")
	mflag.IntVar(&bufSzMB, []string{"#bufsz", "-bufsz"}, 8, "capture buffer size in MB")
	mflag.StringVar(&httpAddr, []string{"#httpaddr", "#-httpaddr", "-http-addr"}, fmt.Sprintf(":%d", weave.HTTPPort), "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
	mflag.StringVar(&iprangeCIDR, []string{"#iprange", "#-iprange", "-ipalloc-range"}, "", "IP address range reserved for automatic allocation, in CIDR notation")
	mflag.StringVar(&ipsubnetCIDR, []string{"#ipsubnet", "#-ipsubnet", "-ipalloc-default-subnet"}, "", "subnet to allocate within by default, in CIDR notation")
	mflag.IntVar(&peerCount, []string{"#initpeercount", "#-initpeercount", "-init-peer-count"}, 0, "number of peers in network (for IP address allocation)")
	mflag.StringVar(&apiPath, []string{"#api", "-api"}, "unix:///var/run/docker.sock", "Path to Docker API socket")
	mflag.BoolVar(&noDNS, []string{"-no-dns"}, false, "disable DNS server")
	mflag.StringVar(&dnsDomain, []string{"-dns-domain"}, nameserver.DefaultDomain, "local domain to server requests for")
	mflag.IntVar(&dnsPort, []string{"-dns-port"}, nameserver.DefaultPort, "port to listen on for DNS requests")
	mflag.IntVar(&dnsTTL, []string{"-dns-ttl"}, nameserver.DefaultTTL, "TTL for DNS request from our domain")
	mflag.DurationVar(&dnsClientTimeout, []string{"-dns-fallback-timeout"}, nameserver.DefaultClientTimeout, "timeout for fallback DNS requests")

	mflag.Parse()
	peers = mflag.Args()

	SetLogLevel(logLevel)
	if justVersion {
		fmt.Printf("weave router %s\n", version)
		os.Exit(0)
	}

	Log.Println("Command line options:", options())
	Log.Println("Command line peers:", peers)

	if protocolMinVersion < weave.ProtocolMinVersion || protocolMinVersion > weave.ProtocolMaxVersion {
		Log.Fatalf("--min-protocol-version must be in range [%d,%d]", weave.ProtocolMinVersion, weave.ProtocolMaxVersion)
	}
	config.ProtocolMinVersion = byte(protocolMinVersion)

	var err error

	if ifaceName != "" {
		config.Iface, err = weavenet.EnsureInterface(ifaceName, wait)
		if err != nil {
			Log.Fatal(err)
		}
	}

	if routerName == "" {
		if config.Iface == nil {
			Log.Fatal("Either an interface must be specified with --iface or a name with -name")
		}
		routerName = config.Iface.HardwareAddr.String()
	}
	name, err := weave.PeerNameFromUserInput(routerName)
	if err != nil {
		Log.Fatal(err)
	}

	if nickName == "" {
		nickName, err = os.Hostname()
//.........这里部分代码省略.........

func main() {
	var (
		justVersion     bool
		dockerCli       *docker.Client
		ifaceName       string
		apiPath         string
		domain          string
		dnsPort         int
		httpIfaceName   string
		httpPort        int
		wait            int
		ttl             int
		negTTL          int
		timeout         int
		udpbuf          int
		fallback        string
		refreshInterval int
		relevantTime    int
		maxAnswers      int
		cacheLen        int
		cacheDisabled   bool
		watch           bool
		logLevel        string
		err             error
	)

	mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
	mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to use for multicast")
	mflag.StringVar(&apiPath, []string{"#api", "-api"}, "unix:///var/run/docker.sock", "path to Docker API socket")
	mflag.StringVar(&domain, []string{"#domain", "-domain"}, weavedns.DefaultLocalDomain, "local domain (ie, 'weave.local.')")
	mflag.IntVar(&wait, []string{"#wait", "-wait"}, -1, "number of seconds to wait for interfaces to come up (0=don't wait, -1=wait forever)")
	mflag.IntVar(&dnsPort, []string{"#dnsport", "#-dnsport", "-dns-port"}, weavedns.DefaultServerPort, "port to listen to DNS requests")
	mflag.StringVar(&httpIfaceName, []string{"#httpiface", "#-httpiface", "-http-iface"}, "", "interface on which to listen for HTTP requests (empty string means listen on all interfaces)")
	mflag.IntVar(&httpPort, []string{"#httpport", "#-httpport", "-http-port"}, weavedns.DefaultHTTPPort, "port to listen to HTTP requests")
	mflag.IntVar(&cacheLen, []string{"#cache", "-cache"}, weavedns.DefaultCacheLen, "cache length")
	mflag.IntVar(&ttl, []string{"#ttl", "-ttl"}, weavedns.DefaultLocalTTL, "TTL (in secs) for responses for local names")
	mflag.BoolVar(&watch, []string{"#watch", "-watch"}, true, "watch the docker socket for container events")
	mflag.StringVar(&logLevel, []string{"-log-level"}, "info", "logging level (debug, info, warning, error)")
	// advanced options
	mflag.IntVar(&negTTL, []string{"#neg-ttl", "-neg-ttl"}, 0, "negative TTL (in secs) for unanswered queries for local names (0=same value as --ttl")
	mflag.IntVar(&refreshInterval, []string{"#refresh", "-refresh"}, weavedns.DefaultRefreshInterval, "refresh interval (in secs) for local names (0=disable)")
	mflag.IntVar(&maxAnswers, []string{"#max-answers", "#-max-answers", "-dns-max-answers"}, weavedns.DefaultMaxAnswers, "maximum number of answers returned to clients (0=unlimited)")
	mflag.IntVar(&relevantTime, []string{"#relevant", "-relevant"}, weavedns.DefaultRelevantTime, "life time for info in the absence of queries (in secs)")
	mflag.IntVar(&udpbuf, []string{"#udpbuf", "#-udpbuf", "-dns-udpbuf"}, weavedns.DefaultUDPBuflen, "UDP buffer length for DNS")
	mflag.IntVar(&timeout, []string{"#timeout", "#-timeout", "-dns-timeout"}, weavedns.DefaultTimeout, "timeout for resolutions (in millisecs)")
	mflag.BoolVar(&cacheDisabled, []string{"#no-cache", "-no-cache"}, false, "disable the cache")
	mflag.StringVar(&fallback, []string{"#fallback", "#-fallback", "-dns-fallback"}, "", "force a fallback server (ie, '8.8.8.8:53') (instead of /etc/resolv.conf values)")
	mflag.Parse()

	if justVersion {
		fmt.Printf("weave DNS %s\n", version)
		os.Exit(0)
	}

	SetLogLevel(logLevel)
	Log.Infof("[main] WeaveDNS version %s", version) // first thing in log: the version

	var iface *net.Interface
	if ifaceName != "" {
		var err error
		Log.Infoln("[main] Waiting for mDNS interface", ifaceName, "to come up")
		iface, err = weavenet.EnsureInterface(ifaceName, wait)
		if err != nil {
			Log.Fatal(err)
		} else {
			Log.Infoln("[main] Interface", ifaceName, "is up")
		}
	}

	var httpIP string
	if httpIfaceName == "" {
		httpIP = "0.0.0.0"
	} else {
		Log.Infoln("[main] Waiting for HTTP interface", httpIfaceName, "to come up")
		httpIface, err := weavenet.EnsureInterface(httpIfaceName, wait)
		if err != nil {
			Log.Fatal(err)
		}
		Log.Infoln("[main] Interface", httpIfaceName, "is up")

		addrs, err := httpIface.Addrs()
		if err != nil {
			Log.Fatal(err)
		}

		if len(addrs) == 0 {
			Log.Fatal("[main] No addresses on HTTP interface")
		}

		ip, _, err := net.ParseCIDR(addrs[0].String())
		if err != nil {
			Log.Fatal(err)
		}

		httpIP = ip.String()

	}
	httpAddr := net.JoinHostPort(httpIP, strconv.Itoa(httpPort))

	zoneConfig := weavedns.ZoneConfig{
//.........这里部分代码省略.........

func main() {
	procs := runtime.NumCPU()
	// packet sniffing can block an OS thread, so we need one thread
	// for that plus at least one more.
	if procs < 2 {
		procs = 2
	}
	runtime.GOMAXPROCS(procs)

	var (
		config                    weave.Config
		justVersion               bool
		protocolMinVersion        int
		ifaceName                 string
		routerName                string
		nickName                  string
		password                  string
		pktdebug                  bool
		logLevel                  string
		prof                      string
		bufSzMB                   int
		noDiscovery               bool
		httpAddr                  string
		iprangeCIDR               string
		ipsubnetCIDR              string
		peerCount                 int
		dockerAPI                 string
		peers                     []string
		noDNS                     bool
		dnsDomain                 string
		dnsListenAddress          string
		dnsTTL                    int
		dnsClientTimeout          time.Duration
		dnsEffectiveListenAddress string
		iface                     *net.Interface
	)

	mflag.BoolVar(&justVersion, []string{"#version", "-version"}, false, "print version and exit")
	mflag.IntVar(&config.Port, []string{"#port", "-port"}, weave.Port, "router port")
	mflag.IntVar(&protocolMinVersion, []string{"-min-protocol-version"}, weave.ProtocolMinVersion, "minimum weave protocol version")
	mflag.StringVar(&ifaceName, []string{"#iface", "-iface"}, "", "name of interface to capture/inject from (disabled if blank)")
	mflag.StringVar(&routerName, []string{"#name", "-name"}, "", "name of router (defaults to MAC of interface)")
	mflag.StringVar(&nickName, []string{"#nickname", "-nickname"}, "", "nickname of peer (defaults to hostname)")
	mflag.StringVar(&password, []string{"#password", "-password"}, "", "network password")
	mflag.StringVar(&logLevel, []string{"-log-level"}, "info", "logging level (debug, info, warning, error)")
	mflag.BoolVar(&pktdebug, []string{"#pktdebug", "#-pktdebug", "-pkt-debug"}, false, "enable per-packet debug logging")
	mflag.StringVar(&prof, []string{"#profile", "-profile"}, "", "enable profiling and write profiles to given path")
	mflag.IntVar(&config.ConnLimit, []string{"#connlimit", "#-connlimit", "-conn-limit"}, 30, "connection limit (0 for unlimited)")
	mflag.BoolVar(&noDiscovery, []string{"#nodiscovery", "#-nodiscovery", "-no-discovery"}, false, "disable peer discovery")
	mflag.IntVar(&bufSzMB, []string{"#bufsz", "-bufsz"}, 8, "capture buffer size in MB")
	mflag.StringVar(&httpAddr, []string{"#httpaddr", "#-httpaddr", "-http-addr"}, fmt.Sprintf(":%d", weave.HTTPPort), "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
	mflag.StringVar(&iprangeCIDR, []string{"#iprange", "#-iprange", "-ipalloc-range"}, "", "IP address range reserved for automatic allocation, in CIDR notation")
	mflag.StringVar(&ipsubnetCIDR, []string{"#ipsubnet", "#-ipsubnet", "-ipalloc-default-subnet"}, "", "subnet to allocate within by default, in CIDR notation")
	mflag.IntVar(&peerCount, []string{"#initpeercount", "#-initpeercount", "-init-peer-count"}, 0, "number of peers in network (for IP address allocation)")
	mflag.StringVar(&dockerAPI, []string{"#api", "#-api", "-docker-api"}, "", "Docker API endpoint, e.g. unix:///var/run/docker.sock")
	mflag.BoolVar(&noDNS, []string{"-no-dns"}, false, "disable DNS server")
	mflag.StringVar(&dnsDomain, []string{"-dns-domain"}, nameserver.DefaultDomain, "local domain to server requests for")
	mflag.StringVar(&dnsListenAddress, []string{"-dns-listen-address"}, nameserver.DefaultListenAddress, "address to listen on for DNS requests")
	mflag.IntVar(&dnsTTL, []string{"-dns-ttl"}, nameserver.DefaultTTL, "TTL for DNS request from our domain")
	mflag.DurationVar(&dnsClientTimeout, []string{"-dns-fallback-timeout"}, nameserver.DefaultClientTimeout, "timeout for fallback DNS requests")
	mflag.StringVar(&dnsEffectiveListenAddress, []string{"-dns-effective-listen-address"}, "", "address DNS will actually be listening, after Docker port mapping")

	// crude way of detecting that we probably have been started in a
	// container, with `weave launch` --> suppress misleading paths in
	// mflags error messages.
	if os.Args[0] == "/home/weave/weaver" { // matches the Dockerfile ENTRYPOINT
		os.Args[0] = "weave"
		mflag.CommandLine.Init("weave", mflag.ExitOnError)
	}
	mflag.Parse()

	peers = mflag.Args()

	SetLogLevel(logLevel)
	if justVersion {
		fmt.Printf("weave router %s\n", version)
		os.Exit(0)
	}

	Log.Println("Command line options:", options())
	Log.Println("Command line peers:", peers)

	if protocolMinVersion < weave.ProtocolMinVersion || protocolMinVersion > weave.ProtocolMaxVersion {
		Log.Fatalf("--min-protocol-version must be in range [%d,%d]", weave.ProtocolMinVersion, weave.ProtocolMaxVersion)
	}
	config.ProtocolMinVersion = byte(protocolMinVersion)

	var err error

	if ifaceName != "" {
		iface, err := weavenet.EnsureInterface(ifaceName)
		if err != nil {
			Log.Fatal(err)
		}

		// bufsz flag is in MB
		config.Bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024)
		if err != nil {
			Log.Fatal(err)
		}
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	}

	Log.Println("Command line options:", options())
	Log.Println("Command line peers:", peers)

	if protocolMinVersion < mesh.ProtocolMinVersion || protocolMinVersion > mesh.ProtocolMaxVersion {
		Log.Fatalf("--min-protocol-version must be in range [%d,%d]", mesh.ProtocolMinVersion, mesh.ProtocolMaxVersion)
	}
	config.ProtocolMinVersion = byte(protocolMinVersion)

	overlays := weave.NewOverlaySwitch()
	if datapathName != "" {
		// A datapath name implies that "Bridge" and "Overlay"
		// packet handling use fast datapath, although other
		// options can override that below.  Even if both
		// things are overridden, we might need bridging on
		// the datapath.
		fastdp, err := weave.NewFastDatapath(datapathName, config.Port)
		checkFatal(err)
		networkConfig.Bridge = fastdp.Bridge()
		overlays.Add("fastdp", fastdp.Overlay())
	}
	sleeve := weave.NewSleeveOverlay(config.Port)
	overlays.Add("sleeve", sleeve)
	overlays.SetCompatOverlay(sleeve)

	if ifaceName != "" {
		// -iface can coexist with -datapath, because
		// pcap-based packet capture is a bit more efficient
		// than capture via ODP misses, even when using an
		// ODP-based bridge.  So when using weave encyption,
		// it's preferable to use -iface.
		var err error
		iface, err = weavenet.EnsureInterface(ifaceName)
		checkFatal(err)

		// bufsz flag is in MB
		networkConfig.Bridge, err = weave.NewPcap(iface, bufSzMB*1024*1024)
		checkFatal(err)
	}

	if password == "" {
		password = os.Getenv("WEAVE_PASSWORD")
	}

	if password == "" {
		Log.Println("Communication between peers is unencrypted.")
	} else {
		config.Password = []byte(password)
		Log.Println("Communication between peers via untrusted networks is encrypted.")
	}

	if routerName == "" {
		if iface == nil {
			Log.Fatal("Either an interface must be specified with --iface or a name with -name")
		}
		routerName = iface.HardwareAddr.String()
	}

	name, err := mesh.PeerNameFromUserInput(routerName)
	checkFatal(err)

	if nickName == "" {
		nickName, err = os.Hostname()
		checkFatal(err)
	}

func main() {

	log.SetPrefix(weave.Protocol + " ")
	log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds)

	procs := runtime.NumCPU()
	// packet sniffing can block an OS thread, so we need one thread
	// for that plus at least one more.
	if procs < 2 {
		procs = 2
	}
	runtime.GOMAXPROCS(procs)

	var (
		config      weave.RouterConfig
		justVersion bool
		ifaceName   string
		routerName  string
		nickName    string
		password    string
		wait        int
		debug       bool
		prof        string
		peers       []string
		bufSzMB     int
		httpAddr    string
	)

	flag.BoolVar(&justVersion, "version", false, "print version and exit")
	flag.IntVar(&config.Port, "port", weave.Port, "router port")
	flag.StringVar(&ifaceName, "iface", "", "name of interface to capture/inject from (disabled if blank)")
	flag.StringVar(&routerName, "name", "", "name of router (defaults to MAC of interface)")
	flag.StringVar(&nickName, "nickname", "", "nickname of peer (defaults to hostname)")
	flag.StringVar(&password, "password", "", "network password")
	flag.IntVar(&wait, "wait", 0, "number of seconds to wait for interface to be created and come up (0 = don't wait)")
	flag.BoolVar(&debug, "debug", false, "enable debug logging")
	flag.StringVar(&prof, "profile", "", "enable profiling and write profiles to given path")
	flag.IntVar(&config.ConnLimit, "connlimit", 30, "connection limit (0 for unlimited)")
	flag.IntVar(&bufSzMB, "bufsz", 8, "capture buffer size in MB")
	flag.StringVar(&httpAddr, "httpaddr", fmt.Sprintf(":%d", weave.HTTPPort), "address to bind HTTP interface to (disabled if blank, absolute path indicates unix domain socket)")
	flag.Parse()
	peers = flag.Args()

	if justVersion {
		fmt.Printf("weave router %s\n", version)
		os.Exit(0)
	}

	log.Println("Command line options:", options())
	log.Println("Command line peers:", peers)

	var err error

	if ifaceName != "" {
		config.Iface, err = weavenet.EnsureInterface(ifaceName, wait)
		if err != nil {
			log.Fatal(err)
		}
	}

	if routerName == "" {
		if config.Iface == nil {
			log.Fatal("Either an interface must be specified with -iface or a name with -name")
		}
		routerName = config.Iface.HardwareAddr.String()
	}
	name, err := weave.PeerNameFromUserInput(routerName)
	if err != nil {
		log.Fatal(err)
	}

	if nickName == "" {
		nickName, err = os.Hostname()
		if err != nil {
			log.Fatal(err)
		}
	}

	if password == "" {
		password = os.Getenv("WEAVE_PASSWORD")
	}

	if password == "" {
		log.Println("Communication between peers is unencrypted.")
	} else {
		config.Password = []byte(password)
		log.Println("Communication between peers is encrypted.")
	}

	if prof != "" {
		p := *profile.CPUProfile
		p.ProfilePath = prof
		defer profile.Start(&p).Stop()
	}

	config.BufSz = bufSzMB * 1024 * 1024
	config.LogFrame = logFrameFunc(debug)

	router := weave.NewRouter(config, name, nickName)
	log.Println("Our name is", router.Ourself.FullName())
//.........这里部分代码省略.........

func checkNetwork() error {
	_, err := weavenet.EnsureInterface("ethwe")
	return err
}