add ARP; add tap internal calls; more lneto2 additions

examples/tap/main.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/netip"
+	"os"
+	"time"
+
+	"github.com/soypat/lneto/internal"
+)
+
+func main() {
+	err := run()
+	if err != nil {
+		log.Fatalln("failed:", err)
+	}
+	fmt.Println("finished")
+
+}
+
+func run() error {
+	ip := netip.MustParsePrefix("192.168.10.1/24")
+	tap, err := internal.NewTap("tap0", ip)
+	if err != nil {
+		return err
+	}
+	defer tap.Close()
+	var buf [2048]byte
+	pkt := 0
+	for {
+		n, err := tap.Read(buf[:])
+		if err != nil {
+			return err
+		} else if n == 0 {
+			time.Sleep(250 * time.Millisecond)
+			continue
+		}
+		pkt++
+		fmt.Fprintf(os.Stdout, "rx%d (%d): %q\n\n", pkt, n, buf[:n])
+	}
+}