Example #1
0
//Create and bind to queue specified by queueId
func NewNFQueue(queueId uint16, maxPacketsInQueue uint32, packetSize uint32) (*NFQueue, error) {
	var nfq = NFQueue{}
	var err error
	var ret C.int

	if nfq.h, err = C.nfq_open(); err != nil {
		return nil, fmt.Errorf("Error opening NFQueue handle: %v\n", err)
	}

	if ret, err = C.nfq_unbind_pf(nfq.h, AF_INET); err != nil || ret < 0 {
		return nil, fmt.Errorf("Error unbinding existing NFQ handler from AF_INET protocol family: %v\n", err)
	}

	if ret, err := C.nfq_bind_pf(nfq.h, AF_INET); err != nil || ret < 0 {
		return nil, fmt.Errorf("Error binding to AF_INET protocol family: %v\n", err)
	}

	nfq.packets = make(chan NFPacket)
	if nfq.qh, err = C.CreateQueue(nfq.h, C.u_int16_t(queueId), unsafe.Pointer(&nfq.packets)); err != nil || nfq.qh == nil {
		C.nfq_close(nfq.h)
		return nil, fmt.Errorf("Error binding to queue: %v\n", err)
	}

	if ret, err = C.nfq_set_queue_maxlen(nfq.qh, C.u_int32_t(maxPacketsInQueue)); err != nil || ret < 0 {
		C.nfq_destroy_queue(nfq.qh)
		C.nfq_close(nfq.h)
		return nil, fmt.Errorf("Unable to set max packets in queue: %v\n", err)
	}

	if C.nfq_set_mode(nfq.qh, C.u_int8_t(2), C.uint(packetSize)) < 0 {
		C.nfq_destroy_queue(nfq.qh)
		C.nfq_close(nfq.h)
		return nil, fmt.Errorf("Unable to set packets copy mode: %v\n", err)
	}

	if nfq.fd, err = C.nfq_fd(nfq.h); err != nil {
		C.nfq_destroy_queue(nfq.qh)
		C.nfq_close(nfq.h)
		return nil, fmt.Errorf("Unable to get queue file-descriptor. %v", err)
	}

	go nfq.run()

	return &nfq, nil
}
Example #2
0
func (this *nfQueue) init() {
	var err error
	if this.h, err = C.nfq_open(); err != nil || this.h == nil {
		panic(err)
	}

	//if this.qh, err = C.nfq_create_queue(this.h, qid, C.get_cb(), unsafe.Pointer(nfq)); err != nil || this.qh == nil {

	this.pktch = make(chan *Packet, 1)

	if C.nfq_unbind_pf(this.h, C.AF_INET) < 0 {
		this.Destroy()
		panic("nfq_unbind_pf(AF_INET) failed, are you running root?.")
	}
	if C.nfq_unbind_pf(this.h, C.AF_INET6) < 0 {
		this.Destroy()
		panic("nfq_unbind_pf(AF_INET6) failed.")
	}

	if C.nfq_bind_pf(this.h, C.AF_INET) < 0 {
		this.Destroy()
		panic("nfq_bind_pf(AF_INET) failed.")
	}

	if C.nfq_bind_pf(this.h, C.AF_INET6) < 0 {
		this.Destroy()
		panic("nfq_bind_pf(AF_INET6) failed.")
	}

	if this.qh, err = C.create_queue(this.h, C.uint16_t(this.qid), unsafe.Pointer(this)); err != nil || this.qh == nil {
		C.nfq_close(this.h)
		panic(err)
	}

	this.fd = int(C.nfq_fd(this.h))

	if C.nfq_set_mode(this.qh, C.NFQNL_COPY_PACKET, 0xffff) < 0 {
		this.Destroy()
		panic("nfq_set_mode(NFQNL_COPY_PACKET) failed.")
	}
	if C.nfq_set_queue_maxlen(this.qh, 1024*8) < 0 {
		this.Destroy()
		panic("nfq_set_queue_maxlen(1024 * 8) failed.")
	}
}