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64 changes: 64 additions & 0 deletions README.md
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Expand Up @@ -29,6 +29,70 @@ go get -u github.com/songgao/water/waterutil

## Example

### TUN on Linux:

```go
package main

import (
"log"

"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/songgao/water"
)

func main() {
config := water.Config{
DeviceType: water.TUN,
}
config.Name = "tun0"

ifce, err := water.New(config)
if err != nil {
log.Fatal(err)
}
var frame = make([]byte, 1500, 1500)
for {
n, err := ifce.Read([]byte(frame))
if err != nil {
log.Fatal(err)
}
pkg := gopacket.NewPacket(frame[:n], layers.LayerTypeIPv4, gopacket.NoCopy)
if ipLayer := pkg.Layer(layers.LayerTypeIPv4); ipLayer != nil {
ip := ipLayer.(*layers.IPv4)
if icmpLayer := pkg.Layer(layers.LayerTypeICMPv4); icmpLayer != nil {
log.Printf("Src: %v Dst: %v\n", ip.SrcIP, ip.DstIP)
icmp := icmpLayer.(*layers.ICMPv4)
icmp.TypeCode = layers.ICMPv4TypeEchoReply
ip.DstIP, ip.SrcIP = ip.SrcIP, ip.DstIP
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true, ComputeChecksums: true}
gopacket.SerializeLayers(buf,
opts,
ip,
icmp,
gopacket.Payload(pkg.ApplicationLayer().Payload()),
)
ifce.Write(buf.Bytes())
}
}
}
}

```

```bash
sudo go run main.go
```
In a new terminal:

```bash
sudo /sbin/ip link set dev tun0 up mtu 1500
sudo /sbin/ip addr add dev tun0 local 10.255.255.253 peer 10.255.255.254
ping 10.255.255.254
```

### TAP on Linux:

```go
Expand Down