network: Add support for multiple addresses and HW addresses

Logical Interfaces can be assigned a hardware address allowing them
to match on MAC address. The static config method also needs to
support specifying multiple addresses.

network/interface.go

@@ -2,6 +2,7 @@ package network
 
 import (
 	"fmt"
+	"net"
 	"sort"
 	"strconv"
 	"strings"
@@ -25,13 +26,21 @@ type networkInterface interface {
 
 type logicalInterface struct {
 	name        string
+	hwaddr      net.HardwareAddr
 	config      configMethod
 	children    []networkInterface
 	configDepth int
 }
 
 func (i *logicalInterface) Network() string {
-	config := fmt.Sprintf("[Match]\nName=%s\n\n[Network]\n", i.name)
+	config := fmt.Sprintln("[Match]")
+	if i.name != "" {
+		config += fmt.Sprintf("Name=%s\n", i.name)
+	}
+	if i.hwaddr != nil {
+		config += fmt.Sprintf("MACAddress=%s\n", i.hwaddr)
+	}
+	config += "\n[Network]\n"
 
 	for _, child := range i.children {
 		switch iface := child.(type) {
@@ -47,8 +56,8 @@ func (i *logicalInterface) Network() string {
 		for _, nameserver := range conf.nameservers {
 			config += fmt.Sprintf("DNS=%s\n", nameserver)
 		}
-		if conf.address.IP != nil {
-			config += fmt.Sprintf("\n[Address]\nAddress=%s\n", conf.address.String())
+		for _, addr := range conf.addresses {
+			config += fmt.Sprintf("\n[Address]\nAddress=%s\n", addr.String())
 		}
 		for _, route := range conf.routes {
 			config += fmt.Sprintf("\n[Route]\nDestination=%s\nGateway=%s\n", route.destination.String(), route.gateway)

network/interface_test.go

@@ -181,9 +181,11 @@ func TestVLANInterfaceNetwork(t *testing.T) {
 		logicalInterface{
 			name: "testname",
 			config: configMethodStatic{
-				address: net.IPNet{
-					IP:   []byte{192, 168, 1, 100},
-					Mask: []byte{255, 255, 255, 0},
+				addresses: []net.IPNet{
+					{
+						IP:   []byte{192, 168, 1, 100},
+						Mask: []byte{255, 255, 255, 0},
+					},
 				},
 				nameservers: []net.IP{
 					[]byte{8, 8, 8, 8},

network/stanza.go

@@ -37,7 +37,7 @@ type route struct {
 type configMethod interface{}
 
 type configMethodStatic struct {
-	address     net.IPNet
+	addresses   []net.IPNet
 	nameservers []net.IP
 	routes      []route
 	hwaddress   net.HardwareAddr
@@ -193,20 +193,21 @@ func parseInterfaceStanza(attributes []string, options []string) (*stanzaInterfa
 	switch confMethod {
 	case "static":
 		config := configMethodStatic{
+			addresses:   make([]net.IPNet, 1),
 			routes:      make([]route, 0),
 			nameservers: make([]net.IP, 0),
 		}
 		if addresses, ok := optionMap["address"]; ok {
 			if len(addresses) == 1 {
-				config.address.IP = net.ParseIP(addresses[0])
+				config.addresses[0].IP = net.ParseIP(addresses[0])
 			}
 		}
 		if netmasks, ok := optionMap["netmask"]; ok {
 			if len(netmasks) == 1 {
-				config.address.Mask = net.IPMask(net.ParseIP(netmasks[0]).To4())
+				config.addresses[0].Mask = net.IPMask(net.ParseIP(netmasks[0]).To4())
 			}
 		}
-		if config.address.IP == nil || config.address.Mask == nil {
+		if config.addresses[0].IP == nil || config.addresses[0].Mask == nil {
 			return nil, fmt.Errorf("malformed static network config for %q", iface)
 		}
 		if gateways, ok := optionMap["gateway"]; ok {

network/stanza_test.go

@@ -194,9 +194,11 @@ func TestParseVLANStanzas(t *testing.T) {
 
 func TestParseInterfaceStanzaStaticAddress(t *testing.T) {
 	options := []string{"address 192.168.1.100", "netmask 255.255.255.0"}
-	expect := net.IPNet{
-		IP:   net.IPv4(192, 168, 1, 100),
-		Mask: net.IPv4Mask(255, 255, 255, 0),
+	expect := []net.IPNet{
+		{
+			IP:   net.IPv4(192, 168, 1, 100),
+			Mask: net.IPv4Mask(255, 255, 255, 0),
+		},
 	}
 
 	iface, err := parseInterfaceStanza([]string{"eth", "inet", "static"}, options)
@@ -207,7 +209,7 @@ func TestParseInterfaceStanzaStaticAddress(t *testing.T) {
 	if !ok {
 		t.FailNow()
 	}
-	if !reflect.DeepEqual(static.address, expect) {
+	if !reflect.DeepEqual(static.addresses, expect) {
 		t.FailNow()
 	}
 }