[TASK] Allow binding to arbitrary ports for respondd querying (#48)

Allow binding respondd to a specific port

cmd/yanic-query/main.go

@@ -19,7 +19,7 @@ func main() {
 
 	nodes := models.NewNodes(&models.Config{})
 
-	collector := respond.NewCollector(nil, nodes, iface)
+	collector := respond.NewCollector(nil, nodes, iface, 0)
 	collector.SendPacket(net.ParseIP(dstAddress))
 
 	time.Sleep(time.Second)

cmd/yanic/main.go

@@ -50,7 +50,7 @@ func main() {
 	nodes.Start()
 
 	if config.Respondd.Enable {
-		collector = respond.NewCollector(db, nodes, config.Respondd.Interface)
+		collector = respond.NewCollector(db, nodes, config.Respondd.Interface, config.Respondd.Port)
 		collector.Start(config.Respondd.CollectInterval.Duration)
 		defer collector.Close()
 	}

config_example.toml

@@ -5,6 +5,9 @@ enable           = true
 collect_interval = "1m"
 # on which interface
 interface        = "eth0"
+# define a port to listen
+# (no or 0 would choose at port at his own)
+#port = 10001
 
 
 # A little build-in webserver, which statically serves a directory.

models/config.go

@@ -11,6 +11,7 @@ type Config struct {
 	Respondd struct {
 		Enable          bool
 		Interface       string
+		Port            int
 		CollectInterval Duration
 	}
 	Webserver struct {

respond/collector.go

@@ -27,7 +27,7 @@ type Collector struct {
 }
 
 // NewCollector creates a Collector struct
-func NewCollector(db *database.DB, nodes *models.Nodes, iface string) *Collector {
+func NewCollector(db *database.DB, nodes *models.Nodes, iface string, port int) *Collector {
 	linkLocalAddr, err := getLinkLocalAddr(iface)
 	if err != nil {
 		log.Panic(err)
@@ -36,6 +36,7 @@ func NewCollector(db *database.DB, nodes *models.Nodes, iface string) *Collector
 	// Open socket
 	conn, err := net.ListenUDP("udp", &net.UDPAddr{
 		IP:   linkLocalAddr,
+		Port: port,
 		Zone: iface,
 	})
 	if err != nil {