Example #1
0
func lookupIface() (*net.Interface, net.IP, error) {
	var iface *net.Interface
	var ipaddr net.IP
	var err error

	if len(opts.iface) > 0 {
		if ipaddr = net.ParseIP(opts.iface); ipaddr != nil {
			iface, err = ip.GetInterfaceByIP(ipaddr)
			if err != nil {
				return nil, nil, fmt.Errorf("Error looking up interface %s: %s", opts.iface, err)
			}
		} else {
			iface, err = net.InterfaceByName(opts.iface)
			if err != nil {
				return nil, nil, fmt.Errorf("Error looking up interface %s: %s", opts.iface, err)
			}
		}
	} else {
		log.Info("Determining IP address of default interface")
		if iface, err = ip.GetDefaultGatewayIface(); err != nil {
			return nil, nil, fmt.Errorf("Failed to get default interface: %s", err)
		}
	}

	if ipaddr == nil {
		ipaddr, err = ip.GetIfaceIP4Addr(iface)
		if err != nil {
			return nil, nil, fmt.Errorf("Failed to find IPv4 address for interface %s", iface.Name)
		}
	}

	return iface, ipaddr, nil
}
Example #2
0
func lookupExtIface(ifname string) (*backend.ExternalInterface, error) {
	var iface *net.Interface
	var iaddr net.IP
	var err error

	if len(ifname) > 0 {
		if iaddr = net.ParseIP(ifname); iaddr != nil {
			iface, err = ip.GetInterfaceByIP(iaddr)
			if err != nil {
				return nil, fmt.Errorf("error looking up interface %s: %s", ifname, err)
			}
		} else {
			iface, err = net.InterfaceByName(ifname)
			if err != nil {
				return nil, fmt.Errorf("error looking up interface %s: %s", ifname, err)
			}
		}
	} else {
		log.Info("Determining IP address of default interface")
		if iface, err = ip.GetDefaultGatewayIface(); err != nil {
			return nil, fmt.Errorf("failed to get default interface: %s", err)
		}
	}

	if iaddr == nil {
		iaddr, err = ip.GetIfaceIP4Addr(iface)
		if err != nil {
			return nil, fmt.Errorf("failed to find IPv4 address for interface %s", iface.Name)
		}
	}

	if iface.MTU == 0 {
		return nil, fmt.Errorf("failed to determine MTU for %s interface", iaddr)
	}

	var eaddr net.IP

	if len(opts.publicIP) > 0 {
		eaddr = net.ParseIP(opts.publicIP)
		if eaddr == nil {
			return nil, fmt.Errorf("invalid public IP address", opts.publicIP)
		}
	}

	if eaddr == nil {
		eaddr = iaddr
	}

	log.Infof("Using %s as external interface", iaddr)
	log.Infof("Using %s as external endpoint", eaddr)

	return &backend.ExternalInterface{
		Iface:     iface,
		IfaceAddr: iaddr,
		ExtAddr:   eaddr,
	}, nil
}