/
create_send_packets.go
77 lines (71 loc) · 1.82 KB
/
create_send_packets.go
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package main
import (
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"github.com/google/gopacket/pcap"
"log"
"net"
"time"
)
var (
device = "eth0"
snapshotLen int32 = 1024
promiscuous = false
err error
timeout = 30 * time.Second
handle *pcap.Handle
buffer gopacket.SerializeBuffer
options gopacket.SerializeOptions
)
func main() {
// Open device
handle, err = pcap.OpenLive(device, snapshotLen, promiscuous, timeout)
if err != nil {
log.Fatal("Error opening device. ", err)
}
defer handle.Close()
// Send raw bytes over wire
rawBytes := []byte{10, 20, 30}
err = handle.WritePacketData(rawBytes)
if err != nil {
log.Fatal("Error writing bytes to network device. ", err)
}
// Create a properly formed packet, just with
// empty details. Should fill out MAC addresses,
// IP addresses, etc.
buffer = gopacket.NewSerializeBuffer()
gopacket.SerializeLayers(buffer, options,
&layers.Ethernet{},
&layers.IPv4{},
&layers.TCP{},
gopacket.Payload(rawBytes),
)
outgoingPacket := buffer.Bytes()
// Send our packet
err = handle.WritePacketData(outgoingPacket)
if err != nil {
log.Fatal("Error sending packet to network device. ", err)
}
// This time lets fill out some information
ipLayer := &layers.IPv4{
SrcIP: net.IP{127, 0, 0, 1},
DstIP: net.IP{8, 8, 8, 8},
}
ethernetLayer := &layers.Ethernet{
SrcMAC: net.HardwareAddr{0xFF, 0xAA, 0xFA, 0xAA, 0xFF, 0xAA},
DstMAC: net.HardwareAddr{0xBD, 0xBD, 0xBD, 0xBD, 0xBD, 0xBD},
}
tcpLayer := &layers.TCP{
SrcPort: layers.TCPPort(4321),
DstPort: layers.TCPPort(80),
}
// And create the packet with the layers
buffer = gopacket.NewSerializeBuffer()
gopacket.SerializeLayers(buffer, options,
ethernetLayer,
ipLayer,
tcpLayer,
gopacket.Payload(rawBytes),
)
outgoingPacket = buffer.Bytes()
}