Add support for listening on multiple interfaces (#80)

closes #79

cmd/query.go

@@ -26,7 +26,7 @@ var queryCmd = &cobra.Command{
 
 		nodes := runtime.NewNodes(&runtime.Config{})
 
-		collector := respond.NewCollector(nil, nodes, iface, 0)
+		collector := respond.NewCollector(nil, nodes, []string{iface}, 0)
 		defer collector.Close()
 		collector.SendPacket(dstAddress)
 

cmd/serve.go

@@ -51,7 +51,7 @@ var serveCmd = &cobra.Command{
 				time.Sleep(delay)
 			}
 
-			collector = respond.NewCollector(connections, nodes, config.Respondd.Interface, config.Respondd.Port)
+			collector = respond.NewCollector(connections, nodes, config.Respondd.Interfaces, config.Respondd.Port)
 			collector.Start(config.Respondd.CollectInterval.Duration)
 			defer collector.Close()
 		}

config_example.toml

@@ -6,7 +6,7 @@ synchronize      = "1m"
 # how oftern request per multicast
 collect_interval = "1m"
 # on which interface
-interface        = "eth0"
+interfaces       = ["eth0"]
 # define a port to listen
 # (no or 0 would choose at port at his own)
 #port = 10001

respond/collector.go

@@ -17,17 +17,44 @@ import (
 
 // Collector for a specificle respond messages
 type Collector struct {
-	connection *net.UDPConn   // UDP socket
-	queue      chan *Response // received responses
-	iface      string
-	db         database.Connection
-	nodes      *runtime.Nodes
-	interval   time.Duration // Interval for multicast packets
-	stop       chan interface{}
+	connections []*net.UDPConn          // UDP sockets
+	ifaceToConn map[string]*net.UDPConn // map from interface name to UDP socket
+
+	queue    chan *Response // received responses
+	db       database.Connection
+	nodes    *runtime.Nodes
+	interval time.Duration // Interval for multicast packets
+	stop     chan interface{}
 }
 
 // NewCollector creates a Collector struct
-func NewCollector(db database.Connection, nodes *runtime.Nodes, iface string, port int) *Collector {
+func NewCollector(db database.Connection, nodes *runtime.Nodes, ifaces []string, port int) *Collector {
+
+	coll := &Collector{
+		db:          db,
+		nodes:       nodes,
+		queue:       make(chan *Response, 400),
+		stop:        make(chan interface{}),
+		ifaceToConn: make(map[string]*net.UDPConn),
+	}
+
+	for _, iface := range ifaces {
+		coll.listenUDP(iface)
+	}
+
+	go coll.parser()
+
+	if coll.db != nil {
+		go coll.globalStatsWorker()
+	}
+
+	return coll
+}
+
+func (coll *Collector) listenUDP(iface string) {
+	if _, found := coll.ifaceToConn[iface]; found {
+		log.Panicf("can not listen twice on %s", iface)
+	}
 	linkLocalAddr, err := getLinkLocalAddr(iface)
 	if err != nil {
 		log.Panic(err)
@@ -44,23 +71,11 @@ func NewCollector(db database.Connection, nodes *runtime.Nodes, iface string, po
 	}
 	conn.SetReadBuffer(maxDataGramSize)
 
-	collector := &Collector{
-		connection: conn,
-		db:         db,
-		nodes:      nodes,
-		iface:      iface,
-		queue:      make(chan *Response, 400),
-		stop:       make(chan interface{}),
-	}
+	coll.ifaceToConn[iface] = conn
+	coll.connections = append(coll.connections, conn)
 
-	go collector.receiver()
-	go collector.parser()
-
-	if collector.db != nil {
-		go collector.globalStatsWorker()
-	}
-
-	return collector
+	// Start receiver
+	go coll.receiver(conn)
 }
 
 // Returns the first link local unicast address for the given interface name
@@ -102,7 +117,9 @@ func (coll *Collector) Start(interval time.Duration) {
 // Close Collector
 func (coll *Collector) Close() {
 	close(coll.stop)
-	coll.connection.Close()
+	for _, conn := range coll.connections {
+		conn.Close()
+	}
 	close(coll.queue)
 }
 
@@ -116,8 +133,10 @@ func (coll *Collector) sendOnce() {
 }
 
 func (coll *Collector) sendMulticast() {
-	log.Println("sending multicast")
-	coll.SendPacket(net.ParseIP(multiCastGroup))
+	log.Println("sending multicasts")
+	for _, conn := range coll.connections {
+		coll.sendPacket(conn, multiCastGroup)
+	}
 }
 
 // Send unicast packets to nodes that did not answer the multicast
@@ -132,20 +151,30 @@ func (coll *Collector) sendUnicasts(seenBefore jsontime.Time) {
 	// Send unicast packets
 	log.Printf("sending unicast to %d nodes", len(nodes))
 	for _, node := range nodes {
-		coll.SendPacket(node.Address)
+		conn := coll.ifaceToConn[node.Address.Zone]
+		if conn == nil {
+			log.Printf("unable to find connection for %s", node.Address.Zone)
+			continue
+		}
+		coll.sendPacket(conn, node.Address.IP)
 		time.Sleep(10 * time.Millisecond)
 	}
 }
 
-// SendPacket sends a UDP request to the given unicast or multicast address
-func (coll *Collector) SendPacket(address net.IP) {
+// SendPacket sends a UDP request to the given unicast or multicast address on the first UDP socket
+func (coll *Collector) SendPacket(destination net.IP) {
+	coll.sendPacket(coll.connections[0], destination)
+}
+
+// sendPacket sends a UDP request to the given unicast or multicast address on the given UDP socket
+func (coll *Collector) sendPacket(conn *net.UDPConn, destination net.IP) {
 	addr := net.UDPAddr{
-		IP:   address,
+		IP:   destination,
 		Port: port,
-		Zone: coll.iface,
+		Zone: conn.LocalAddr().(*net.UDPAddr).Zone,
 	}
 
-	if _, err := coll.connection.WriteToUDP([]byte("GET nodeinfo statistics neighbours"), &addr); err != nil {
+	if _, err := conn.WriteToUDP([]byte("GET nodeinfo statistics neighbours"), &addr); err != nil {
 		log.Println("WriteToUDP failed:", err)
 	}
 }
@@ -187,7 +216,7 @@ func (res *Response) parse() (*data.ResponseData, error) {
 	return rdata, err
 }
 
-func (coll *Collector) saveResponse(addr net.UDPAddr, res *data.ResponseData) {
+func (coll *Collector) saveResponse(addr *net.UDPAddr, res *data.ResponseData) {
 	// Search for NodeID
 	var nodeID string
 	if val := res.NodeInfo; val != nil {
@@ -217,7 +246,7 @@ func (coll *Collector) saveResponse(addr net.UDPAddr, res *data.ResponseData) {
 
 	// Process the data and update IP address
 	node := coll.nodes.Update(nodeID, res)
-	node.Address = addr.IP
+	node.Address = addr
 
 	// Store statistics in database
 	if db := coll.db; db != nil {
@@ -232,10 +261,10 @@ func (coll *Collector) saveResponse(addr net.UDPAddr, res *data.ResponseData) {
 	}
 }
 
-func (coll *Collector) receiver() {
+func (coll *Collector) receiver(conn *net.UDPConn) {
 	buf := make([]byte, maxDataGramSize)
 	for {
-		n, src, err := coll.connection.ReadFromUDP(buf)
+		n, src, err := conn.ReadFromUDP(buf)
 
 		if err != nil {
 			log.Println("ReadFromUDP failed:", err)
@@ -246,7 +275,7 @@ func (coll *Collector) receiver() {
 		copy(raw, buf)
 
 		coll.queue <- &Response{
-			Address: *src,
+			Address: src,
 			Raw:     raw,
 		}
 	}

respond/collector_test.go

@@ -3,10 +3,21 @@ package respond
 import (
 	"io/ioutil"
 	"testing"
+	"time"
 
+	"github.com/FreifunkBremen/yanic/runtime"
 	"github.com/stretchr/testify/assert"
 )
 
+func TestCollector(t *testing.T) {
+	nodes := runtime.NewNodes(&runtime.Config{})
+
+	collector := NewCollector(nil, nodes, []string{}, 10001)
+	collector.Start(time.Millisecond)
+	time.Sleep(time.Millisecond * 10)
+	collector.Close()
+}
+
 func TestParse(t *testing.T) {
 	assert := assert.New(t)
 

respond/respond.go

@@ -4,9 +4,10 @@ import (
 	"net"
 )
 
+// default multicast group used by announced
+var multiCastGroup = net.ParseIP("ff02:0:0:0:0:0:2:1001")
+
 const (
-	// default multicast group used by announced
-	multiCastGroup = "ff02:0:0:0:0:0:2:1001"
 
 	// default udp port used by announced
 	port = 1001
@@ -15,8 +16,8 @@ const (
 	maxDataGramSize = 8192
 )
 
-//Response of the respond request
+// Response of the respond request
 type Response struct {
-	Address net.UDPAddr
+	Address *net.UDPAddr
 	Raw     []byte
 }

runtime/config.go

@@ -11,7 +11,7 @@ type Config struct {
 	Respondd struct {
 		Enable          bool     `toml:"enable"`
 		Synchronize     Duration `toml:"synchronize"`
-		Interface       string   `toml:"interface"`
+		Interfaces      []string `toml:"interfaces"`
 		Port            int      `toml:"port"`
 		CollectInterval Duration `toml:"collect_interval"`
 	}

runtime/config_test.go

@@ -15,7 +15,7 @@ func TestReadConfig(t *testing.T) {
 	assert.NotNil(config)
 
 	assert.True(config.Respondd.Enable)
-	assert.Equal("eth0", config.Respondd.Interface)
+	assert.Equal([]string{"eth0"}, config.Respondd.Interfaces)
 	assert.Equal(time.Minute, config.Respondd.CollectInterval.Duration)
 
 	assert.Equal(2, config.Meshviewer.Version)

runtime/node.go

@@ -9,7 +9,7 @@ import (
 
 // Node struct
 type Node struct {
-	Address    net.IP           `json:"address"` // the last known IP address
+	Address    *net.UDPAddr     `json:"-"` // the last known address
 	Firstseen  jsontime.Time    `json:"firstseen"`
 	Lastseen   jsontime.Time    `json:"lastseen"`
 	Online     bool             `json:"online"`