Update dependencies

vendor/github.com/insomniacslk/dhcp/interfaces/bindtodevice_bsd.go

@@ -0,0 +1,19 @@
+// +build aix freebsd openbsd netbsd dragonfly
+
+package interfaces
+
+import (
+	"net"
+
+	"golang.org/x/sys/unix"
+)
+
+// BindToInterface emulates linux's SO_BINDTODEVICE option for a socket by using
+// IP_RECVIF.
+func BindToInterface(fd int, ifname string) error {
+	iface, err := net.InterfaceByName(ifname)
+	if err != nil {
+		return err
+	}
+	return unix.SetsockoptInt(fd, unix.IPPROTO_IP, unix.IP_RECVIF, iface.Index)
+}

vendor/github.com/insomniacslk/dhcp/interfaces/bindtodevice_darwin.go

@@ -0,0 +1,19 @@
+// +build darwin
+
+package interfaces
+
+import (
+	"net"
+
+	"golang.org/x/sys/unix"
+)
+
+// BindToInterface emulates linux's SO_BINDTODEVICE option for a socket by using
+// IP_BOUND_IF.
+func BindToInterface(fd int, ifname string) error {
+	iface, err := net.InterfaceByName(ifname)
+	if err != nil {
+		return err
+	}
+	return unix.SetsockoptInt(fd, unix.IPPROTO_IP, unix.IP_BOUND_IF, iface.Index)
+}

vendor/github.com/insomniacslk/dhcp/interfaces/bindtodevice_linux.go

@@ -0,0 +1,9 @@
+// +build linux
+
+package interfaces
+
+import "golang.org/x/sys/unix"
+
+func BindToInterface(fd int, ifname string) error {
+	return unix.BindToDevice(fd, ifname)
+}

vendor/github.com/insomniacslk/dhcp/interfaces/bindtodevice_windows.go

@@ -0,0 +1,8 @@
+package interfaces
+
+import "errors"
+
+// BindToInterface fails on Windows.
+func BindToInterface(fd int, ifname string) error {
+	return errors.New("not implemented on Windows")
+}

vendor/github.com/insomniacslk/dhcp/interfaces/interfaces.go

@@ -0,0 +1,41 @@
+package interfaces
+
+import "net"
+
+// InterfaceMatcher is a function type used to match the interfaces we want. See
+// GetInterfacesFunc below for usage.
+type InterfaceMatcher func(net.Interface) bool
+
+// interfaceGetter is used for testing purposes
+var interfaceGetter = net.Interfaces
+
+// GetInterfacesFunc loops through the available network interfaces, and returns
+// a list of interfaces for which the passed InterfaceMatcher function returns
+// true.
+func GetInterfacesFunc(matcher InterfaceMatcher) ([]net.Interface, error) {
+	ifaces, err := interfaceGetter()
+	if err != nil {
+		return nil, err
+	}
+	ret := make([]net.Interface, 0)
+	for _, iface := range ifaces {
+		if matcher(iface) {
+			ret = append(ret, iface)
+		}
+	}
+	return ret, nil
+}
+
+// GetLoopbackInterfaces returns a list of loopback interfaces.
+func GetLoopbackInterfaces() ([]net.Interface, error) {
+	return GetInterfacesFunc(func(iface net.Interface) bool {
+		return iface.Flags&net.FlagLoopback != 0
+	})
+}
+
+// GetNonLoopbackInterfaces returns a list of non-loopback interfaces.
+func GetNonLoopbackInterfaces() ([]net.Interface, error) {
+	return GetInterfacesFunc(func(iface net.Interface) bool {
+		return iface.Flags&net.FlagLoopback == 0
+	})
+}