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packetSendTest.go
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packetSendTest.go
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package main
import (
"code.google.com/p/gopacket"
"code.google.com/p/gopacket/examples/util"
"code.google.com/p/gopacket/layers"
"fmt"
"golang.org/x/net/ipv4"
"log"
"net"
)
func main() {
defer util.Run()()
var srcIP, dstIP net.IP
var srcIPstr string = "127.0.0.1"
var dstIPstr string = "127.0.0.1"
// source ip
srcIP = net.ParseIP(srcIPstr)
if srcIP == nil {
log.Printf("non-ip target: %q\n", srcIPstr)
}
srcIP = srcIP.To4()
if srcIP == nil {
log.Printf("non-ipv4 target: %q\n", srcIPstr)
}
// destination ip
dstIP = net.ParseIP(dstIPstr)
if dstIP == nil {
log.Printf("non-ip target: %q\n", dstIPstr)
}
dstIP = dstIP.To4()
if dstIP == nil {
log.Printf("non-ipv4 target: %q\n", dstIPstr)
}
// build tcp/ip packet
ip := layers.IPv4{
SrcIP: srcIP,
DstIP: dstIP,
Version: 4,
TTL: 64,
Protocol: layers.IPProtocolTCP,
}
srcport := layers.TCPPort(666)
dstport := layers.TCPPort(22)
tcp := layers.TCP{
SrcPort: srcport,
DstPort: dstport,
Window: 1505,
Urgent: 0,
Seq: 11050,
Ack: 0,
ACK: false,
SYN: false,
FIN: false,
RST: false,
URG: false,
ECE: false,
CWR: false,
NS: false,
PSH: false,
}
opts := gopacket.SerializeOptions{
FixLengths: true,
ComputeChecksums: true,
}
tcp.SetNetworkLayerForChecksum(&ip)
ipHeaderBuf := gopacket.NewSerializeBuffer()
err := ip.SerializeTo(ipHeaderBuf, opts)
if err != nil {
panic(err)
}
ipHeader, err := ipv4.ParseHeader(ipHeaderBuf.Bytes())
if err != nil {
panic(err)
}
tcpPayloadBuf := gopacket.NewSerializeBuffer()
payload := gopacket.Payload([]byte("meowmeowmeow"))
err = gopacket.SerializeLayers(tcpPayloadBuf, opts, &tcp, payload)
if err != nil {
panic(err)
}
// XXX end of packet creation
// XXX send packet
var packetConn net.PacketConn
var rawConn *ipv4.RawConn
packetConn, err = net.ListenPacket("ip4:tcp", "127.0.0.1")
if err != nil {
panic(err)
}
rawConn, err = ipv4.NewRawConn(packetConn)
if err != nil {
panic(err)
}
err = rawConn.WriteTo(ipHeader, tcpPayloadBuf.Bytes(), nil)
log.Printf("packet of length %d sent!\n", (len(tcpPayloadBuf.Bytes()) + len(ipHeaderBuf.Bytes())))
}