CalcChecksums function crashes

[dosgo]

[dosgo]

 
func main() {
	var filter = "outbound and !loopback and !impostor and udp.DstPort=53 and udp.SrcPort!=7770"
	winDivert, err := divert.Open(filter, divert.LayerNetwork, divert.PriorityDefault, divert.FlagDefault)
	if err != nil {
		log.Printf(" divert.Open err : %v", err)
		return
	}
	rawbuf := make([]byte, 1500)
	var bufByte1 []byte = make([]byte, 1500)
	var tempBuf []byte = make([]byte, 1500)
	rAddr := &net.UDPAddr{IP: net.ParseIP("114.114.114.114"), Port: 53}
	dnsConn, _ := net.DialUDP("udp", &net.UDPAddr{Port: 7770}, rAddr)
	defer dnsConn.Close()
	addr := divert.Address{}
	for {
		bufLen, err := winDivert.Recv(tempBuf, &addr)
		if err != nil || bufLen == 0 {
			fmt.Printf("Recv err:%+v\r\n", err)
			continue
		}
		ipv6 := uint(tempBuf[0])>>4 == 6
		var ipheadlen int
		if ipv6 {
			ipheadlen = 40
		} else {
			ipheadlen = int(tempBuf[0]&0xF) * 4
		}
		udpheadlen := 8
		request := tempBuf[ipheadlen+udpheadlen : bufLen]
		dnsConn.Write(request)
		n, err := dnsConn.Read(bufByte1)
		if err == nil {
			if n == 1500 {
				fmt.Printf("n:n\r\n")
			}
			var response = bufByte1[:n]
			udpsize := len(response) + 8
			var packetsize int
			if ipv6 {
				copy(rawbuf, []byte{96, 12, 19, 68, 0, 98, 17, 128})
				packetsize = 40 + udpsize
				binary.BigEndian.PutUint16(rawbuf[4:], uint16(udpsize))
				copy(rawbuf[8:], tempBuf[24:40])
				copy(rawbuf[24:], tempBuf[8:24])
				copy(rawbuf[ipheadlen:], tempBuf[ipheadlen+2:ipheadlen+4])
				copy(rawbuf[ipheadlen+2:], tempBuf[ipheadlen:ipheadlen+2])
			} else {
				copy(rawbuf, []byte{69, 0, 1, 32, 141, 152, 64, 0, 64, 17, 150, 46})
				packetsize = 20 + udpsize
				binary.BigEndian.PutUint16(rawbuf[2:], uint16(packetsize))
				copy(rawbuf[12:], tempBuf[16:20])
				copy(rawbuf[16:], tempBuf[12:16])
				copy(rawbuf[20:], tempBuf[ipheadlen+2:ipheadlen+4])
				copy(rawbuf[22:], tempBuf[ipheadlen:ipheadlen+2])
				ipheadlen = 20
			}
			binary.BigEndian.PutUint16(rawbuf[ipheadlen+4:], uint16(udpsize))
			copy(rawbuf[ipheadlen+8:], response)
			packet := rawbuf[:packetsize]
			var flag uint64 = 1
			divert.CalcChecksums(packet, &addr, flag)
			_, err = winDivert.Send(packet, &addr)
			if err != nil {
				fmt.Printf("Send err:%+v\r\n", err)
				return
			}
		}
	}
}

[dosgo]

Thanks! dll test passed! The checksum can be generated normally!

[dosgo]

The divert_cgo test was successful! divert_embedded compilation failed!

[imgk]

use go 1.18

[dosgo]

Ok! That's the beta version, so there shouldn't be any other issues.

[dosgo]

Ok! That's the beta version, so there shouldn't be any other issues.