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huge tap/bridge overhaul; udp node; dhcp node; DHCP example

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This commit is contained in:
soypat
2025-06-15 18:01:04 -03:00
parent 29ac9a3a1a
commit dcc7a95e62
16 changed files with 706 additions and 157 deletions
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examples/tap/main.go
+41 -12
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@@ -2,6 +2,7 @@ package main
import (
"errors"
"flag"
"fmt"
"log"
"log/slog"
@@ -9,9 +10,11 @@ import (
"net/http"
"net/netip"
"runtime"
"strings"
"time"
"github.com/soypat/lneto"
"github.com/soypat/lneto/internal"
"github.com/soypat/lneto/internal/ltesto"
"github.com/soypat/lneto/internet/pcap"
"github.com/soypat/lneto/tcp"
@@ -27,17 +30,35 @@ func main() {
}
func run() error {
var (
flagInterface = "tap0"
)
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'")
var (
flagNet = "192.168.10.1/24"
flagiface = "tap0"
flagMTU = 1500
flagPacketQueueSize = 2048
)
ip, err := netip.ParsePrefix(flagNet)
if err != nil {
return err
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(flagiface, ip, flagMTU, flagPacketQueueSize, flagPacketQueueSize)
sv, err := ltesto.NewHTTPTapServer(iface, flagPacketQueueSize, flagPacketQueueSize)
if err != nil {
return err
}
@@ -48,8 +69,12 @@ func run() error {
frames, err := cap.CaptureEthernet(nil, pkt, 0)
if err == nil {
flags, src, dst := getTCPData(frames, pkt)
if flags != 0 {
fmt.Println(channel, captime.Format("15:04:05.000"), frames, flags.String(), src, "->", dst)
if src != 0 {
if flags != 0 {
fmt.Println(channel, captime.Format("15:04:05.000"), frames, flags.String(), src, "->", dst)
} else {
fmt.Println(channel, captime.Format("15:04:05.000"), frames, src, "->", dst)
}
} else {
fmt.Println(channel, captime.Format("15:04:05.000"), frames)
}
@@ -86,12 +111,16 @@ func run() error {
func getTCPData(frames []pcap.Frame, pkt []byte) (flags tcp.Flags, src, dst uint16) {
for i := range frames {
if frames[i].Protocol != lneto.IPProtoTCP {
continue
proto := frames[i].Protocol
if proto == lneto.IPProtoTCP {
return tcp.Flags(getFrameClassUint(frames[i], pkt, pcap.FieldClassFlags)),
uint16(getFrameClassUint(frames[i], pkt, pcap.FieldClassSrc)),
uint16(getFrameClassUint(frames[i], pkt, pcap.FieldClassDst))
} else if proto == lneto.IPProtoUDP {
return 0,
uint16(getFrameClassUint(frames[i], pkt, pcap.FieldClassSrc)),
uint16(getFrameClassUint(frames[i], pkt, pcap.FieldClassDst))
}
return tcp.Flags(getFrameClassUint(frames[i], pkt, pcap.FieldClassFlags)),
uint16(getFrameClassUint(frames[i], pkt, pcap.FieldClassSrc)),
uint16(getFrameClassUint(frames[i], pkt, pcap.FieldClassDst))
}
return 0, 0, 0
}