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udp spoof test
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package main | |
import ( | |
"bytes" | |
"encoding/binary" | |
"golang.org/x/net/ipv4" | |
"log" | |
"net" | |
"syscall" | |
) | |
const UDP_HEADER_LEN = 8 | |
type UdpHeader struct { | |
SourcePort uint16 | |
DestinationPort uint16 | |
Length uint16 | |
Checksum uint16 | |
} | |
func main() { | |
var err error | |
destIP := net.ParseIP("172.16.21.19") | |
srcIP := net.ParseIP("1.2.3.4") | |
proto := 17 | |
data := []byte("TESTING-ONE-TWO-THREE") | |
udpHeader_t := UdpHeader{ | |
// SourcePort: 8887, | |
// DestinationPort: 8888, | |
// Length: uint16(UDP_HEADER_LEN + len(data)), | |
} | |
buf := bytes.NewBuffer([]byte{}) | |
err = binary.Write(buf, binary.BigEndian, &udpHeader_t) | |
if err != nil { | |
log.Fatal(err) | |
} | |
udpHeader := buf.Bytes() | |
dataWithHeader := append(udpHeader, data...) | |
h := &ipv4.Header{ | |
Version: ipv4.Version, | |
Len: ipv4.HeaderLen, | |
TotalLen: ipv4.HeaderLen + UDP_HEADER_LEN + len(data), | |
ID: 12345, | |
Protocol: proto, | |
Dst: destIP.To4(), | |
Src: srcIP.To4(), | |
} | |
fd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_RAW) | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_HDRINCL, 1) | |
if err != nil { | |
log.Fatal(err) | |
} | |
addr := syscall.SockaddrInet4{ | |
Addr: [4]byte{172, 16, 21, 19}, | |
} | |
out, err := h.Marshal() | |
if err != nil { | |
log.Fatal(err) | |
} | |
packet := append(out, dataWithHeader...) | |
err = syscall.Sendto(fd, packet, 0, &addr) | |
if err != nil { | |
log.Fatal("Sendto:", err) | |
} | |
syscall.Close(fd) | |
} |
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