Bind DNS names through /etc/hosts

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/github.com/vishvananda/netlink/route.go

@@ -0,0 +1,178 @@
+package netlink
+
+import (
+	"fmt"
+	"net"
+	"strings"
+)
+
+// Scope is an enum representing a route scope.
+type Scope uint8
+
+type NextHopFlag int
+
+type Destination interface {
+	Family() int
+	Decode([]byte) error
+	Encode() ([]byte, error)
+	String() string
+	Equal(Destination) bool
+}
+
+type Encap interface {
+	Type() int
+	Decode([]byte) error
+	Encode() ([]byte, error)
+	String() string
+	Equal(Encap) bool
+}
+
+// Route represents a netlink route.
+type Route struct {
+	LinkIndex  int
+	ILinkIndex int
+	Scope      Scope
+	Dst        *net.IPNet
+	Src        net.IP
+	Gw         net.IP
+	MultiPath  []*NexthopInfo
+	Protocol   int
+	Priority   int
+	Table      int
+	Type       int
+	Tos        int
+	Flags      int
+	MPLSDst    *int
+	NewDst     Destination
+	Encap      Encap
+	MTU        int
+	AdvMSS     int
+}
+
+func (r Route) String() string {
+	elems := []string{}
+	if len(r.MultiPath) == 0 {
+		elems = append(elems, fmt.Sprintf("Ifindex: %d", r.LinkIndex))
+	}
+	if r.MPLSDst != nil {
+		elems = append(elems, fmt.Sprintf("Dst: %d", r.MPLSDst))
+	} else {
+		elems = append(elems, fmt.Sprintf("Dst: %s", r.Dst))
+	}
+	if r.NewDst != nil {
+		elems = append(elems, fmt.Sprintf("NewDst: %s", r.NewDst))
+	}
+	if r.Encap != nil {
+		elems = append(elems, fmt.Sprintf("Encap: %s", r.Encap))
+	}
+	elems = append(elems, fmt.Sprintf("Src: %s", r.Src))
+	if len(r.MultiPath) > 0 {
+		elems = append(elems, fmt.Sprintf("Gw: %s", r.MultiPath))
+	} else {
+		elems = append(elems, fmt.Sprintf("Gw: %s", r.Gw))
+	}
+	elems = append(elems, fmt.Sprintf("Flags: %s", r.ListFlags()))
+	elems = append(elems, fmt.Sprintf("Table: %d", r.Table))
+	return fmt.Sprintf("{%s}", strings.Join(elems, " "))
+}
+
+func (r Route) Equal(x Route) bool {
+	return r.LinkIndex == x.LinkIndex &&
+		r.ILinkIndex == x.ILinkIndex &&
+		r.Scope == x.Scope &&
+		ipNetEqual(r.Dst, x.Dst) &&
+		r.Src.Equal(x.Src) &&
+		r.Gw.Equal(x.Gw) &&
+		nexthopInfoSlice(r.MultiPath).Equal(x.MultiPath) &&
+		r.Protocol == x.Protocol &&
+		r.Priority == x.Priority &&
+		r.Table == x.Table &&
+		r.Type == x.Type &&
+		r.Tos == x.Tos &&
+		r.Flags == x.Flags &&
+		(r.MPLSDst == x.MPLSDst || (r.MPLSDst != nil && x.MPLSDst != nil && *r.MPLSDst == *x.MPLSDst)) &&
+		(r.NewDst == x.NewDst || (r.NewDst != nil && r.NewDst.Equal(x.NewDst))) &&
+		(r.Encap == x.Encap || (r.Encap != nil && r.Encap.Equal(x.Encap)))
+}
+
+func (r *Route) SetFlag(flag NextHopFlag) {
+	r.Flags |= int(flag)
+}
+
+func (r *Route) ClearFlag(flag NextHopFlag) {
+	r.Flags &^= int(flag)
+}
+
+type flagString struct {
+	f NextHopFlag
+	s string
+}
+
+// RouteUpdate is sent when a route changes - type is RTM_NEWROUTE or RTM_DELROUTE
+type RouteUpdate struct {
+	Type uint16
+	Route
+}
+
+type NexthopInfo struct {
+	LinkIndex int
+	Hops      int
+	Gw        net.IP
+	Flags     int
+	NewDst    Destination
+	Encap     Encap
+}
+
+func (n *NexthopInfo) String() string {
+	elems := []string{}
+	elems = append(elems, fmt.Sprintf("Ifindex: %d", n.LinkIndex))
+	if n.NewDst != nil {
+		elems = append(elems, fmt.Sprintf("NewDst: %s", n.NewDst))
+	}
+	if n.Encap != nil {
+		elems = append(elems, fmt.Sprintf("Encap: %s", n.Encap))
+	}
+	elems = append(elems, fmt.Sprintf("Weight: %d", n.Hops+1))
+	elems = append(elems, fmt.Sprintf("Gw: %s", n.Gw))
+	elems = append(elems, fmt.Sprintf("Flags: %s", n.ListFlags()))
+	return fmt.Sprintf("{%s}", strings.Join(elems, " "))
+}
+
+func (n NexthopInfo) Equal(x NexthopInfo) bool {
+	return n.LinkIndex == x.LinkIndex &&
+		n.Hops == x.Hops &&
+		n.Gw.Equal(x.Gw) &&
+		n.Flags == x.Flags &&
+		(n.NewDst == x.NewDst || (n.NewDst != nil && n.NewDst.Equal(x.NewDst))) &&
+		(n.Encap == x.Encap || (n.Encap != nil && n.Encap.Equal(x.Encap)))
+}
+
+type nexthopInfoSlice []*NexthopInfo
+
+func (n nexthopInfoSlice) Equal(x []*NexthopInfo) bool {
+	if len(n) != len(x) {
+		return false
+	}
+	for i := range n {
+		if n[i] == nil || x[i] == nil {
+			return false
+		}
+		if !n[i].Equal(*x[i]) {
+			return false
+		}
+	}
+	return true
+}
+
+// ipNetEqual returns true iff both IPNet are equal
+func ipNetEqual(ipn1 *net.IPNet, ipn2 *net.IPNet) bool {
+	if ipn1 == ipn2 {
+		return true
+	}
+	if ipn1 == nil || ipn2 == nil {
+		return false
+	}
+	m1, _ := ipn1.Mask.Size()
+	m2, _ := ipn2.Mask.Size()
+	return m1 == m2 && ipn1.IP.Equal(ipn2.IP)
+}