Example #1
0
// SetDirection sets the direction for which packets will be captured.
func (p *Handle) SetDirection(direction Direction) error {
	if direction != DirectionIn && direction != DirectionOut && direction != DirectionInOut {
		return fmt.Errorf("Invalid direction: %v", direction)
	}
	if status := C.pcap_setdirection(p.cptr, (C.pcap_direction_t)(direction)); status < 0 {
		return statusError(status)
	}
	return nil
}
Example #2
0
func (p *Pcap) SetDirection(direction string) (err error) {
	var pcap_direction C.pcap_direction_t
	if direction == "in" {
		pcap_direction = C.PCAP_D_IN
	} else if direction == "out" {
		pcap_direction = C.PCAP_D_OUT
	} else {
		pcap_direction = C.PCAP_D_INOUT
	}
	if -1 == C.pcap_setdirection(p.cptr, pcap_direction) {
		return p.Geterror()
	}
	return nil
}
Example #3
0
func main() {
	var errbuf = (*C.char)(C.malloc(C.PCAP_ERRBUF_SIZE))
	defer C.free(unsafe.Pointer(errbuf))
	var source = C.CString("any")
	defer C.free(unsafe.Pointer(source))

	pcap_handle := C.pcap_create(source, errbuf)
	if pcap_handle == nil {
		panic("pcap_handle")
	}
	C.pcap_set_buffer_size(pcap_handle, 2*1024*1024)
	C.pcap_set_promisc(pcap_handle, 1)
	C.pcap_set_snaplen(pcap_handle, 512) // more than enough to recognize a WOL packet
	C.pcap_setdirection(pcap_handle, C.PCAP_D_IN)
	if C.pcap_activate(pcap_handle) != 0 {
		panic(C.GoString(C.pcap_geterr(pcap_handle)))
	}

	var bpf_program C.struct_bpf_program
	if C.pcap_compile(pcap_handle, &bpf_program, pcap_filter, 0, 0) != 0 {
		panic(C.GoString(C.pcap_geterr(pcap_handle)))
	}
	if C.pcap_setfilter(pcap_handle, &bpf_program) != 0 {
		panic(C.GoString(C.pcap_geterr(pcap_handle)))
	}

	for {
		var pkt_header *C.struct_pcap_pkthdr
		var pkt_data *C.u_char
		if C.pcap_next_ex(pcap_handle, &pkt_header, &pkt_data) < 0 {
			panic(C.GoString(C.pcap_geterr(pcap_handle)))
		}
		if pkt_data == nil {
			continue
		}
		data := make([]byte, pkt_header.caplen)
		copy(data, (*(*[10000000]byte)(unsafe.Pointer(pkt_data)))[0:])
		from_mac, to_mac := checkwol(data)
		if from_mac != "" {
			fmt.Printf("%v: %v sends WOL to %v\n", time.Now(), from_mac, to_mac)
		}
	}

}