Golang IP.String方法代碼示例

// RequestPort requests new port from global ports pool for specified ip and proto.
// If port is 0 it returns first free port. Otherwise it cheks port availability
// in pool and return that port or error if port is already busy.
func RequestPort(ip net.IP, proto string, port int) (int, error) {
	mutex.Lock()
	defer mutex.Unlock()

	if proto != "tcp" && proto != "udp" {
		return 0, ErrUnknownProtocol
	}

	if ip == nil {
		ip = defaultIP
	}
	ipstr := ip.String()
	protomap, ok := globalMap[ipstr]
	if !ok {
		protomap = newProtoMap()
		globalMap[ipstr] = protomap
	}
	mapping := protomap[proto]
	if port > 0 {
		if _, ok := mapping.p[port]; !ok {
			mapping.p[port] = struct{}{}
			return port, nil
		}
		return 0, NewErrPortAlreadyAllocated(ipstr, port)
	}

	port, err := mapping.findPort()
	if err != nil {
		return 0, err
	}
	return port, nil
}

func (n *network) deleteSvcRecords(name string, epIP net.IP, ipMapUpdate bool) {
	c := n.getController()
	c.Lock()
	defer c.Unlock()
	sr, ok := c.svcDb[n.ID()]
	if !ok {
		return
	}

	if ipMapUpdate {
		delete(sr.ipMap, netutils.ReverseIP(epIP.String()))
	}

	ipList := sr.svcMap[name]
	for i, ip := range ipList {
		if ip.Equal(epIP) {
			ipList = append(ipList[:i], ipList[i+1:]...)
			break
		}
	}
	sr.svcMap[name] = ipList

	if len(ipList) == 0 {
		delete(sr.svcMap, name)
	}
}

// NodeAddresses returns the NodeAddresses of the instance with the specified nodeName.
func (v *OVirtCloud) NodeAddresses(nodeName types.NodeName) ([]api.NodeAddress, error) {
	name := mapNodeNameToInstanceName(nodeName)
	instance, err := v.fetchInstance(name)
	if err != nil {
		return nil, err
	}

	var address net.IP

	if instance.IPAddress != "" {
		address = net.ParseIP(instance.IPAddress)
		if address == nil {
			return nil, fmt.Errorf("couldn't parse address: %s", instance.IPAddress)
		}
	} else {
		resolved, err := net.LookupIP(name)
		if err != nil || len(resolved) < 1 {
			return nil, fmt.Errorf("couldn't lookup address: %s", name)
		}
		address = resolved[0]
	}

	return []api.NodeAddress{
		{Type: api.NodeLegacyHostIP, Address: address.String()},
		{Type: api.NodeInternalIP, Address: address.String()},
		{Type: api.NodeExternalIP, Address: address.String()},
	}, nil
}

// findLoopbackDevice iterates through all the interfaces on a machine and
// returns the ip addr, mask of the loopback device
func (a *Agent) findLoopbackDevice() (string, string, string, error) {
	var ifcs []net.Interface
	var err error
	ifcs, err = net.Interfaces()
	if err != nil {
		return "", "", "", err
	}
	for _, ifc := range ifcs {
		addrs, err := ifc.Addrs()
		if err != nil {
			return "", "", "", err
		}
		for _, addr := range addrs {
			var ip net.IP
			switch v := addr.(type) {
			case *net.IPNet:
				ip = v.IP
			case *net.IPAddr:
				ip = v.IP
			}
			if ip.IsLoopback() {
				if ip.To4() == nil {
					continue
				}
				return ifc.Name, ip.String(), addr.String(), nil
			}
		}
	}

	return "", "", "", fmt.Errorf("no loopback devices with IPV4 addr found")
}

func interfaceGot(index int, pciAddr int, name string, inf *network.Settings) (*InterfaceCreated, error) {
	ip, nw, err := net.ParseCIDR(fmt.Sprintf("%s/%d", inf.IPAddress, inf.IPPrefixLen))
	if err != nil {
		glog.Error("can not parse cidr")
		return &InterfaceCreated{Index: index, PCIAddr: pciAddr, DeviceName: name}, err
	}
	var tmp []byte = nw.Mask
	var mask net.IP = tmp

	rt := []*RouteRule{}
	/* Route rule is generated automaticly on first interface,
	 * or generated on the gateway configured interface. */
	if (index == 0 && inf.Automatic) || (!inf.Automatic && inf.Gateway != "") {
		rt = append(rt, &RouteRule{
			Destination: "0.0.0.0/0",
			Gateway:     inf.Gateway, ViaThis: true,
		})
	}

	return &InterfaceCreated{
		Index:      index,
		PCIAddr:    pciAddr,
		Bridge:     inf.Bridge,
		HostDevice: inf.Device,
		DeviceName: name,
		Fd:         inf.File,
		MacAddr:    inf.Mac,
		IpAddr:     ip.String(),
		NetMask:    mask.String(),
		RouteTable: rt,
	}, nil
}

// Allocate a network interface
func Allocate(job *engine.Job) engine.Status {
	var (
		ip          *net.IP
		err         error
		id          = job.Args[0]
		requestedIP = net.ParseIP(job.Getenv("RequestedIP"))
	)

	if requestedIP != nil {
		ip, err = ipallocator.RequestIP(bridgeNetwork, &requestedIP)
	} else {
		ip, err = ipallocator.RequestIP(bridgeNetwork, nil)
	}
	if err != nil {
		return job.Error(err)
	}

	out := engine.Env{}
	out.Set("IP", ip.String())
	out.Set("Mask", bridgeNetwork.Mask.String())
	out.Set("Gateway", bridgeNetwork.IP.String())
	out.Set("Bridge", bridgeIface)

	size, _ := bridgeNetwork.Mask.Size()
	out.SetInt("IPPrefixLen", size)

	currentInterfaces.Set(id, &networkInterface{
		IP: *ip,
	})

	out.WriteTo(job.Stdout)

	return engine.StatusOK
}

// Build a slice of iptables args that are common to from-container and from-host portal rules.
func iptablesCommonPortalArgs(destIP net.IP, addPhysicalInterfaceMatch bool, addDstLocalMatch bool, destPort int, protocol api.Protocol, service proxy.ServicePortName) []string {
	// This list needs to include all fields as they are eventually spit out
	// by iptables-save.  This is because some systems do not support the
	// 'iptables -C' arg, and so fall back on parsing iptables-save output.
	// If this does not match, it will not pass the check.  For example:
	// adding the /32 on the destination IP arg is not strictly required,
	// but causes this list to not match the final iptables-save output.
	// This is fragile and I hope one day we can stop supporting such old
	// iptables versions.
	args := []string{
		"-m", "comment",
		"--comment", service.String(),
		"-p", strings.ToLower(string(protocol)),
		"-m", strings.ToLower(string(protocol)),
		"--dport", fmt.Sprintf("%d", destPort),
	}

	if destIP != nil {
		args = append(args, "-d", fmt.Sprintf("%s/32", destIP.String()))
	}

	if addPhysicalInterfaceMatch {
		args = append(args, "-m", "physdev", "!", "--physdev-is-in")
	}

	if addDstLocalMatch {
		args = append(args, "-m", "addrtype", "--dst-type", "LOCAL")
	}

	return args
}

func (d *driver) resolvePeer(nid string, peerIP net.IP) (net.HardwareAddr, net.IPMask, net.IP, error) {
	qPayload := fmt.Sprintf("%s %s", string(nid), peerIP.String())
	resp, err := d.serfInstance.Query("peerlookup", []byte(qPayload), nil)
	if err != nil {
		return nil, nil, nil, fmt.Errorf("resolving peer by querying the cluster failed: %v", err)
	}

	respCh := resp.ResponseCh()
	select {
	case r := <-respCh:
		var macStr, maskStr, vtepStr string
		if _, err := fmt.Sscan(string(r.Payload), &macStr, &maskStr, &vtepStr); err != nil {
			return nil, nil, nil, fmt.Errorf("bad response %q for the resolve query: %v", string(r.Payload), err)
		}

		mac, err := net.ParseMAC(macStr)
		if err != nil {
			return nil, nil, nil, fmt.Errorf("failed to parse mac: %v", err)
		}

		return mac, net.IPMask(net.ParseIP(maskStr).To4()), net.ParseIP(vtepStr), nil

	case <-time.After(time.Second):
		return nil, nil, nil, fmt.Errorf("timed out resolving peer by querying the cluster")
	}
}

// GetIfacesByIP searches for and returns the interfaces with the given IP
// Disregards the subnet mask since not every net.IP object contains
// On success it will return the list of found interfaces
func (n *Networking) GetIfacesByIP(ifaceIP net.IP) ([]net.Interface, error) {
	ifaces, err := net.Interfaces()
	if err != nil {
		return nil, err
	}

	searchAddr := strings.Split(ifaceIP.String(), "/")[0]
	resultInterfaces := make([]net.Interface, 0)

	for _, iface := range ifaces {
		if iface.Flags&net.FlagLoopback != 0 {
			continue
		}

		addrs, err := iface.Addrs()
		if err != nil {
			return nil, errwrap.Wrap(fmt.Errorf("cannot get addresses for interface %v", iface.Name), err)
		}

		for _, addr := range addrs {
			currentAddr := strings.Split(addr.String(), "/")[0]
			if searchAddr == currentAddr {
				resultInterfaces = append(resultInterfaces, iface)
				break
			}
		}
	}

	if len(resultInterfaces) == 0 {
		return nil, fmt.Errorf("no interface found with IP %q", ifaceIP)
	}

	return resultInterfaces, nil
}

func get_ips() ([]string, error) {
	ips := make([]string, 0)
	ifaces, err := net.Interfaces()
	if err != nil {
		log.Println(err)
		return ips, nil
	}
	for _, iface := range ifaces {
		// log.Println(iface.Name)
		addrs, err := iface.Addrs()
		if err != nil {
			return ips, nil
		}
		for _, addr := range addrs {
			// log.Println(addr.Network(), addr.String())
			var ip net.IP
			switch v := addr.(type) {
			case *net.IPNet:
				ip = v.IP
			case *net.IPAddr:
				ip = v.IP
			}
			// 隻保留ipv4地址
			if ip.To4() != nil && ip.String() != "127.0.0.1" {
				ips = append(ips, ip.String())
			}
		}
	}
	return ips, nil
}

func lookup(stmt *sql.Stmt, IP net.IP, nIP uint32) (*GeoIP, error) {
	var reserved bool
	for _, net := range reservedIPs {
		if net.Contains(IP) {
			reserved = true
			break
		}
	}
	geoip := GeoIP{Ip: IP.String()}
	if reserved {
		geoip.CountryCode = "RD"
		geoip.CountryName = "Reserved"
	} else {
		if err := stmt.QueryRow(nIP).Scan(
			&geoip.CountryCode,
			&geoip.CountryName,
			&geoip.RegionCode,
			&geoip.RegionName,
			&geoip.CityName,
			&geoip.ZipCode,
			&geoip.Latitude,
			&geoip.Longitude,
			&geoip.MetroCode,
			&geoip.AreaCode,
		); err != nil {
			return nil, err
		}
	}
	return &geoip, nil
}

// Request answers a dhcp request
// Uses etcd as backend
// part of DHCPDataSource interface implementation
func (ds *EtcdDataSource) Request(nic string, currentIP net.IP) (net.IP, error) {
	ds.lockDHCPAssign()
	defer ds.unlockdhcpAssign()

	machines, _ := ds.Machines()

	macExists, ipExists := false, false

	for _, node := range machines {
		thisNodeIP, _ := node.IP()
		ipMatch := thisNodeIP.String() == currentIP.String()
		macMatch := nic == node.Mac().String()

		if ipMatch && macMatch {
			ds.store(node, thisNodeIP)
			return currentIP, nil
		}

		ipExists = ipExists || ipMatch
		macExists = macExists || macMatch

	}
	if ipExists || macExists {
		return nil, errors.New("Missmatch in lease pool")
	}
	macAddress, _ := net.ParseMAC(nic)
	ds.CreateMachine(macAddress, currentIP)
	return currentIP, nil
}

func (n *network) addSvcRecords(name string, epIP net.IP, ipMapUpdate bool) {
	c := n.getController()
	c.Lock()
	defer c.Unlock()
	sr, ok := c.svcDb[n.ID()]
	if !ok {
		sr = svcInfo{
			svcMap: make(map[string][]net.IP),
			ipMap:  make(map[string]string),
		}
		c.svcDb[n.ID()] = sr
	}

	if ipMapUpdate {
		reverseIP := netutils.ReverseIP(epIP.String())
		if _, ok := sr.ipMap[reverseIP]; !ok {
			sr.ipMap[reverseIP] = name
		}
	}

	ipList := sr.svcMap[name]
	for _, ip := range ipList {
		if ip.Equal(epIP) {
			return
		}
	}
	sr.svcMap[name] = append(sr.svcMap[name], epIP)
}

func newProxyCommand(proto string, hostIP net.IP, hostPort int, containerIP net.IP, containerPort int, proxyPath string) (userlandProxy, error) {
	path := proxyPath
	if proxyPath == "" {
		cmd, err := exec.LookPath(userlandProxyCommandName)
		if err != nil {
			return nil, err
		}
		path = cmd
	}

	args := []string{
		path,
		"-proto", proto,
		"-host-ip", hostIP.String(),
		"-host-port", strconv.Itoa(hostPort),
		"-container-ip", containerIP.String(),
		"-container-port", strconv.Itoa(containerPort),
	}

	return &proxyCommand{
		cmd: &exec.Cmd{
			Path: path,
			Args: args,
			SysProcAttr: &syscall.SysProcAttr{
				Pdeathsig: syscall.SIGTERM, // send a sigterm to the proxy if the daemon process dies
			},
		},
	}, nil
}

// 一個接口上的所有ip4地址
func addrsOfOneInterface(iface net.Interface) (addrs []*net.IPAddr) {
	ifaddrs, err := iface.Addrs()

	if (err != nil) || (len(ifaddrs) == 0) {
		return
	}

	for _, ifaddr := range ifaddrs {
		var ip net.IP
		switch v := ifaddr.(type) {
		case *net.IPNet:
			ip = v.IP
		case *net.IPAddr:
			ip = v.IP
		default:
			continue
		}
		if ip.IsLoopback() {
			return
		}
		ip = ip.To4()
		if ip != nil {
			addr, _ := net.ResolveIPAddr("ip", ip.String())
			addrs = append(addrs, addr)
		}
	}
	return
}