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package main
import (
"log"
"math/rand"
"net"
"os"
"time"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
)
func main() {
var (
device string = "bridge100"
snapshotLen int32 = 1024
promiscuous bool = false
err error
timeout time.Duration = 10 * time.Second
handle *pcap.Handle
buffer gopacket.SerializeBuffer
random *rand.Rand
)
handle, err = pcap.OpenLive(device, snapshotLen, promiscuous, timeout)
if err != nil {
log.Fatal(err)
}
defer handle.Close()
random = rand.New(rand.NewSource(time.Now().UnixNano()))
srcPort := layers.UDPPort(random.Intn(65535))
dstPort := layers.UDPPort(19)
ethernetLayer := &layers.Ethernet{
SrcMAC: net.HardwareAddr{0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00},
DstMAC: net.HardwareAddr{0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00},
EthernetType: layers.EthernetTypeIPv4,
}
ipLayer := &layers.IPv4{
SrcIP: net.IP{10, 211, 55, 3},
DstIP: net.IP{10, 211, 55, 10},
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolUDP,
}
udpLayer := &layers.UDP{
SrcPort: srcPort,
DstPort: dstPort,
}
udpLayer.SetNetworkLayerForChecksum(ipLayer)
// Chargen query
chargenQuery := []byte("!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz{|}")
payload := chargenQuery
for {
buffer = gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{
FixLengths: true,
ComputeChecksums: true,
}
if err := gopacket.SerializeLayers(buffer, opts, ethernetLayer, ipLayer, udpLayer, gopacket.Payload(payload)); err != nil {
log.Fatal(err)
}
udpPacket := buffer.Bytes()
err = handle.WritePacketData(udpPacket)
if err != nil {
log.Fatal(err)
os.Exit(1)
}
}
}
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