func parsePorts(networkObj *ast.ObjectList, nw *structs.NetworkResource) error {
	portsObjList := networkObj.Filter("port")
	knownPortLabels := make(map[string]bool)
	for _, port := range portsObjList.Items {
		if len(port.Keys) == 0 {
			return fmt.Errorf("ports must be named")
		}
		label := port.Keys[0].Token.Value().(string)
		if !reDynamicPorts.MatchString(label) {
			return errPortLabel
		}
		l := strings.ToLower(label)
		if knownPortLabels[l] {
			return fmt.Errorf("found a port label collision: %s", label)
		}
		var p map[string]interface{}
		var res structs.Port
		if err := hcl.DecodeObject(&p, port.Val); err != nil {
			return err
		}
		if err := mapstructure.WeakDecode(p, &res); err != nil {
			return err
		}
		res.Label = label
		if res.Value > 0 {
			nw.ReservedPorts = append(nw.ReservedPorts, res)
		} else {
			nw.DynamicPorts = append(nw.DynamicPorts, res)
		}
		knownPortLabels[l] = true
	}
	return nil
}

// reservePortsForClient reserves a range of ports for the client to use when
// it creates various plugins for log collection, executors, drivers, etc
func (a *Agent) reservePortsForClient(conf *clientconfig.Config) error {
	// finding the device name for loopback
	deviceName, addr, mask, err := a.findLoopbackDevice()
	if err != nil {
		return fmt.Errorf("error finding the device name for loopback: %v", err)
	}

	// seeing if the user has already reserved some resources on this device
	var nr *structs.NetworkResource
	if conf.Node.Reserved == nil {
		conf.Node.Reserved = &structs.Resources{}
	}
	for _, n := range conf.Node.Reserved.Networks {
		if n.Device == deviceName {
			nr = n
		}
	}
	// If the user hasn't already created the device, we create it
	if nr == nil {
		nr = &structs.NetworkResource{
			Device:        deviceName,
			IP:            addr,
			CIDR:          mask,
			ReservedPorts: make([]structs.Port, 0),
		}
	}
	// appending the port ranges we want to use for the client to the list of
	// reserved ports for this device
	for i := conf.ClientMinPort; i <= conf.ClientMaxPort; i++ {
		nr.ReservedPorts = append(nr.ReservedPorts, structs.Port{Label: fmt.Sprintf("plugin-%d", i), Value: int(i)})
	}
	conf.Node.Reserved.Networks = append(conf.Node.Reserved.Networks, nr)
	return nil
}

// setupClient is used to setup the client if enabled
func (a *Agent) setupClient() error {
	if !a.config.Client.Enabled {
		return nil
	}

	// Setup the configuration
	conf := a.config.ClientConfig
	if conf == nil {
		conf = client.DefaultConfig()
	}
	if a.server != nil {
		conf.RPCHandler = a.server
	}
	conf.LogOutput = a.logOutput
	conf.DevMode = a.config.DevMode
	if a.config.Region != "" {
		conf.Region = a.config.Region
	}
	if a.config.DataDir != "" {
		conf.StateDir = filepath.Join(a.config.DataDir, "client")
		conf.AllocDir = filepath.Join(a.config.DataDir, "alloc")
	}
	if a.config.Client.StateDir != "" {
		conf.StateDir = a.config.Client.StateDir
	}
	if a.config.Client.AllocDir != "" {
		conf.AllocDir = a.config.Client.AllocDir
	}
	conf.Servers = a.config.Client.Servers
	if a.config.Client.NetworkInterface != "" {
		conf.NetworkInterface = a.config.Client.NetworkInterface
	}
	conf.Options = a.config.Client.Options
	if a.config.Client.NetworkSpeed != 0 {
		conf.NetworkSpeed = a.config.Client.NetworkSpeed
	}
	if a.config.Client.MaxKillTimeout != "" {
		dur, err := time.ParseDuration(a.config.Client.MaxKillTimeout)
		if err != nil {
			return fmt.Errorf("Error parsing retry interval: %s", err)
		}
		conf.MaxKillTimeout = dur
	}
	conf.ClientMaxPort = a.config.Client.ClientMaxPort
	conf.ClientMinPort = a.config.Client.ClientMinPort

	// Setup the node
	conf.Node = new(structs.Node)
	conf.Node.Datacenter = a.config.Datacenter
	conf.Node.Name = a.config.NodeName
	conf.Node.Meta = a.config.Client.Meta
	conf.Node.NodeClass = a.config.Client.NodeClass
	httpAddr := fmt.Sprintf("%s:%d", a.config.BindAddr, a.config.Ports.HTTP)
	if a.config.Addresses.HTTP != "" && a.config.AdvertiseAddrs.HTTP == "" {
		addr, err := net.ResolveTCPAddr("tcp", a.config.Addresses.HTTP)
		if err != nil {
			return fmt.Errorf("error resolving http addr: %v:", err)
		}
		httpAddr = fmt.Sprintf("%s:%d", addr.IP.String(), addr.Port)
	} else if a.config.AdvertiseAddrs.HTTP != "" {
		addr, err := net.ResolveTCPAddr("tcp", a.config.AdvertiseAddrs.HTTP)
		if err != nil {
			return fmt.Errorf("error resolving advertise http addr: %v", err)
		}
		httpAddr = fmt.Sprintf("%s:%d", addr.IP.String(), addr.Port)
	}
	conf.Node.HTTPAddr = httpAddr

	// Reserve some ports for the plugins
	if runtime.GOOS == "windows" {
		deviceName, err := a.findLoopbackDevice()
		if err != nil {
			return fmt.Errorf("error finding the device name for loopback: %v", err)
		}
		var nr *structs.NetworkResource
		for _, n := range conf.Node.Reserved.Networks {
			if n.Device == deviceName {
				nr = n
			}
		}
		if nr == nil {
			nr = &structs.NetworkResource{
				Device:        deviceName,
				ReservedPorts: make([]structs.Port, 0),
			}
		}
		for i := conf.ClientMinPort; i <= conf.ClientMaxPort; i++ {
			nr.ReservedPorts = append(nr.ReservedPorts, structs.Port{Label: fmt.Sprintf("plugin-%d", i), Value: int(i)})
		}
	}

	// Create the client
	client, err := client.NewClient(conf)
	if err != nil {
		return fmt.Errorf("client setup failed: %v", err)
	}
	a.client = client
	return nil
}