Esempio n. 1
0
// Create a new NfLog
//
// McastGroup is that specified in ip[6]tables
// IPv6 is a flag to say if it is IPv6 or not
// Direction is to monitor the source address or the dest address
func NewNfLog(McastGroup int, IpVersion byte, Direction IpDirection, MaskBits int, a *Accounting) *NfLog {
	h, err := C.nflog_open()
	if h == nil || err != nil {
		log.Fatalf("Failed to open NFLOG: %s", nflogError(err))
	}
	if *Verbose {
		log.Println("Binding nfnetlink_log to AF_INET")
	}
	if rc, err := C.nflog_bind_pf(h, C.AF_INET); rc < 0 || err != nil {
		log.Fatalf("nflog_bind_pf failed: %s", nflogError(err))
	}

	nflog := &NfLog{
		h:          h,
		fd:         C.nflog_fd(h),
		McastGroup: McastGroup,
		IpVersion:  IpVersion,
		Direction:  Direction,
		a:          a,
		quit:       make(chan struct{}),
		packets:    (*C.packets)(C.malloc(C.sizeof_packets)),
	}
	for i := range nflogs {
		if nflogs[i] == nil {
			nflog.index = i
			nflogs[i] = nflog
			goto found
		}
	}
	log.Fatal("Too many filters")
found:
	switch IpVersion {
	case 4:
		nflog.IpPacket = Ip4Packet
	case 6:
		nflog.IpPacket = Ip6Packet
	default:
		log.Fatalf("Bad IP version %d", IpVersion)
	}
	addrBits := 8 * nflog.IpPacket.AddrLen
	nflog.UseMask = MaskBits < addrBits
	nflog.Mask = net.CIDRMask(MaskBits, addrBits)
	nflog.makeGroup(McastGroup, nflog.IpPacket.HeaderSize)
	// Start the background process
	go nflog.Loop()
	return nflog
}
Esempio n. 2
0
// Create a new NfLog
//
// McastGroup is that specified in ip[6]tables
// IPv6 is a flag to say if it is IPv6 or not
// Direction is to monitor the source address or the dest address
func NewNfLog(McastGroup int, IpVersion byte, Direction IpDirection, MaskBits int, a *Accounting) *NfLog {
	h := C.nflog_open()
	if h == nil {
		log.Fatalf("Failed to open NFLOG: %s", strerror())
	}
	if *Debug {
		log.Println("Binding nfnetlink_log to AF_INET")
	}
	if C.nflog_bind_pf(h, C.AF_INET) < 0 {
		log.Fatalf("nflog_bind_pf failed: %s", strerror())
	}

	nflog := &NfLog{
		h:          h,
		fd:         C.nflog_fd(h),
		McastGroup: McastGroup,
		IpVersion:  IpVersion,
		Direction:  Direction,
		a:          a,
	}
	switch IpVersion {
	case 4:
		nflog.IpPacket = Ip4Packet
	case 6:
		nflog.IpPacket = Ip6Packet
	default:
		log.Fatalf("Bad IP version %d", IpVersion)
	}
	addrBits := 8 * nflog.IpPacket.AddrLen
	nflog.UseMask = MaskBits < addrBits
	nflog.Mask = net.CIDRMask(MaskBits, addrBits)
	nflog.makeGroup(McastGroup, nflog.IpPacket.HeaderSize)
	// Start the background process
	go nflog.Loop()
	return nflog
}