Update dependencies

vendor/github.com/insomniacslk/dhcp/dhcpv4/option_routes.go

@@ -0,0 +1,104 @@
+package dhcpv4
+
+import (
+	"fmt"
+	"net"
+	"strings"
+
+	"github.com/u-root/uio/uio"
+)
+
+// Route is a classless static route as per RFC 3442.
+type Route struct {
+	// Dest is the destination network.
+	Dest *net.IPNet
+
+	// Router is the router to use for the given destination network.
+	Router net.IP
+}
+
+// Marshal implements uio.Marshaler.
+//
+// Format described in RFC 3442:
+//
+// <size of mask in number of bits>
+// <destination address, omitting octets that must be zero per mask>
+// <route IP>
+func (r Route) Marshal(buf *uio.Lexer) {
+	ones, _ := r.Dest.Mask.Size()
+	buf.Write8(uint8(ones))
+
+	// Only write the non-zero octets.
+	dstLen := (ones + 7) / 8
+	buf.WriteBytes(r.Dest.IP.To4()[:dstLen])
+
+	buf.WriteBytes(r.Router.To4())
+}
+
+// Unmarshal implements uio.Unmarshaler.
+func (r *Route) Unmarshal(buf *uio.Lexer) error {
+	maskSize := buf.Read8()
+	if maskSize > 32 {
+		return fmt.Errorf("invalid mask length %d in route option", maskSize)
+	}
+	r.Dest = &net.IPNet{
+		IP:   make([]byte, net.IPv4len),
+		Mask: net.CIDRMask(int(maskSize), 32),
+	}
+
+	dstLen := (maskSize + 7) / 8
+	buf.ReadBytes(r.Dest.IP[:dstLen])
+
+	r.Router = buf.CopyN(net.IPv4len)
+	return buf.Error()
+}
+
+// String prints the destination network and router IP.
+func (r *Route) String() string {
+	return fmt.Sprintf("route to %s via %s", r.Dest, r.Router)
+}
+
+// Routes is a collection of network routes.
+type Routes []*Route
+
+// FromBytes parses routes from a set of bytes as described by RFC 3442.
+func (r *Routes) FromBytes(p []byte) error {
+	buf := uio.NewBigEndianBuffer(p)
+	for buf.Has(1) {
+		var route Route
+		if err := route.Unmarshal(buf); err != nil {
+			return err
+		}
+		*r = append(*r, &route)
+	}
+	return buf.FinError()
+}
+
+// ToBytes marshals a set of routes as described by RFC 3442.
+func (r Routes) ToBytes() []byte {
+	buf := uio.NewBigEndianBuffer(nil)
+	for _, route := range r {
+		route.Marshal(buf)
+	}
+	return buf.Data()
+}
+
+// String prints all routes.
+func (r Routes) String() string {
+	s := make([]string, 0, len(r))
+	for _, route := range r {
+		s = append(s, route.String())
+	}
+	return strings.Join(s, "; ")
+}
+
+// OptClasslessStaticRoute returns a new DHCPv4 Classless Static Route
+// option.
+//
+// The Classless Static Route option is described by RFC 3442.
+func OptClasslessStaticRoute(routes ...*Route) Option {
+	return Option{
+		Code:  OptionClasslessStaticRoute,
+		Value: Routes(routes),
+	}
+}