remove old examples and update readme

examples/httptap/main.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"log"
+	"math"
+	"net"
+	"net/http"
+	"net/netip"
+	"strings"
+	"time"
+
+	"github.com/soypat/lneto/internal"
+	"github.com/soypat/lneto/internal/ltesto"
+	"github.com/soypat/lneto/internet/pcap"
+)
+
+func main() {
+	err := run()
+	if err != nil {
+		log.Fatalln("failed:", err)
+	}
+	fmt.Println("finished")
+
+}
+
+func run() error {
+	var (
+		flagInterface = "tap0"
+		flagMinMTU    = math.MaxUint16
+	)
+	flag.StringVar(&flagInterface, "i", flagInterface, "Interface to select. tap* creates a tap interface. Any other name will create a bridge to the name of the interface i.e: 'enp7s0', 'wlp8s0', 'lo'")
+	flag.IntVar(&flagMinMTU, "mtu", flagMinMTU, "Set the interface minimum MTU to use for buffer.")
+	flag.Parse()
+	if flagMinMTU < 1500 {
+		return errors.New("minimum MTU too small")
+	}
+	var (
+		flagNet             = "192.168.10.1/24"
+		flagiface           = "tap0"
+		flagPacketQueueSize = 2048
+	)
+	var iface ltesto.Interface
+	if strings.HasPrefix(flagInterface, "tap") {
+		pfx, err := netip.ParsePrefix(flagNet)
+		if err != nil {
+			return err
+		}
+		tap, err := internal.NewTap(flagiface, pfx)
+		if err != nil {
+			return err
+		}
+		iface = tap
+	} else {
+		br, err := internal.NewBridge(flagInterface)
+		if err != nil {
+			return err
+		}
+		iface = br
+	}
+
+	sv, err := ltesto.NewHTTPTapServer(iface, flagMinMTU, flagPacketQueueSize, flagPacketQueueSize)
+	if err != nil {
+		return err
+	}
+	defer sv.Close()
+	var cap pcap.PacketBreakdown
+	pf := pcap.Formatter{
+		FilterClasses: []pcap.FieldClass{pcap.FieldClassDst, pcap.FieldClassSrc, pcap.FieldClassSize, pcap.FieldClassFlags},
+	}
+	var pfbuf []byte
+	sv.OnTransfer(func(channel int, pkt []byte) {
+		captime := time.Now()
+		frames, err := cap.CaptureEthernet(nil, pkt, 0)
+		if err == nil {
+			pfbuf = append(pfbuf[:0], '[')
+			pfbuf, err = pf.FormatFrames(pfbuf, frames, pkt)
+			pfbuf = append(pfbuf, ']')
+			if err != nil {
+				fmt.Printf("%d %s !err:%s\n", channel, captime.Format("15:04:05.000"), err)
+			} else {
+				fmt.Printf("%d %s %s\n", channel, captime.Format("15:04:05.000"), pfbuf)
+			}
+		} else {
+			fmt.Println(channel, captime.Format("15:04:05.000"), "cap ERR", frames, err.Error())
+		}
+	})
+	hwaddr, err := sv.HardwareAddress6()
+	if err != nil {
+		return err
+	}
+	fmt.Println("listening on http://127.0.0.1:7070/recv  and  http://127.0.0.1:7070/send on hwaddr:", net.HardwareAddr(hwaddr[:]).String())
+	http.ListenAndServe(":7070", sv)
+	return errors.New("finished")
+}