Exemplo n.º 1
1
// ListenAX25 announces on the local port axPort using mycall as the local address.
func ListenAX25(axPort, mycall string) (net.Listener, error) {
	if _, err := loadPorts(); err != nil {
		return nil, err
	}

	// Setup local address (via callsign of supplied axPort)
	localAddr := newAX25Addr(mycall)
	if err := localAddr.setPort(axPort); err != nil {
		return nil, err
	}

	// Create file descriptor
	var socket fd
	if f, err := syscall.Socket(syscall.AF_AX25, syscall.SOCK_SEQPACKET, 0); err != nil {
		return nil, err
	} else {
		socket = fd(f)
	}

	if err := socket.bind(localAddr); err != nil {
		return nil, err
	}
	if err := syscall.Listen(int(socket), syscall.SOMAXCONN); err != nil {
		return nil, err
	}

	return ax25Listener{
		sock:      fd(socket),
		localAddr: AX25Addr{localAddr},
	}, nil
}
Exemplo n.º 2
0
// NOTE: Taken from the Go source: src/net/sock_cloexec.go
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(family, sotype, proto int) (int, error) {
	s, err := syscall.Socket(family, sotype|syscall.SOCK_CLOEXEC, proto)

	// On Linux the SOCK_NONBLOCK and SOCK_CLOEXEC flags were
	// introduced in 2.6.27 kernel and on FreeBSD both flags were
	// introduced in 10 kernel. If we get an EINVAL error on Linux
	// or EPROTONOSUPPORT error on FreeBSD, fall back to using
	// socket without them.
	if err == nil || (err != syscall.EPROTONOSUPPORT && err != syscall.EINVAL) {
		return s, err
	}

	// See ../syscall/exec_unix.go for description of ForkLock.
	syscall.ForkLock.RLock()
	s, err = syscall.Socket(family, sotype, proto)
	if err == nil {
		syscall.CloseOnExec(s)
	}
	syscall.ForkLock.RUnlock()
	if err != nil {
		return -1, err
	}
	if err = syscall.SetNonblock(s, true); err != nil {
		syscall.Close(s)
		return -1, err
	}
	return s, nil
}
Exemplo n.º 3
0
// Wrapper around the socket system call that marks the returned file
// descriptor as nonblocking and close-on-exec.
func sysSocket(f, t, p int) (int, error) {
	s, err := syscall.Socket(f, t|syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC, p)
	// The SOCK_NONBLOCK and SOCK_CLOEXEC flags were introduced in
	// Linux 2.6.27.  If we get an EINVAL error, fall back to
	// using socket without them.
	if err == nil || err != syscall.EINVAL {
		return s, err
	}

	// See ../syscall/exec_unix.go for description of ForkLock.
	syscall.ForkLock.RLock()
	s, err = syscall.Socket(f, t, p)
	if err == nil {
		syscall.CloseOnExec(s)
	}
	syscall.ForkLock.RUnlock()
	if err != nil {
		return -1, err
	}
	if err = syscall.SetNonblock(s, true); err != nil {
		syscall.Close(s)
		return -1, err
	}
	return s, nil
}
Exemplo n.º 4
0
func traceOne(addr *syscall.SockaddrInet4, ttl int) *ReturnArgs {
	cli, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
	if err != nil {
		exitWithError(err)
	}
	srv, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_ICMP)
	if err != nil {
		exitWithError(err)
	}

	defer syscall.Close(cli)
	defer syscall.Close(srv)

	// set ttl, stolen from somewhere else...
	// https://github.com/aeden/traceroute/blob/master/traceroute.go#L195
	if err := syscall.SetsockoptInt(cli, syscall.SOL_IP, syscall.IP_TTL, ttl); err != nil {
		exitWithError(err)
	}

	// set timeout, stolen from somewhere else...
	// https://github.com/aeden/traceroute/blob/master/traceroute.go#L197
	tv := syscall.NsecToTimeval(1e6 * TIMEOUT)
	if err := syscall.SetsockoptTimeval(srv, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &tv); err != nil {
		exitWithError(err)
	}
	if err := syscall.Bind(srv, toAddr(HOST, RECV_PORT)); err != nil {
		exitWithError(err)
	}

	rr := &ReturnArgs{}
	start := time.Now()
	if err := syscall.Sendto(cli, makeICMP(), 0, addr); err != nil {
		return rr
	}

	buf := make([]byte, 512)
	_, from, err := syscall.Recvfrom(srv, buf, 0)
	if err != nil {
		return rr
	}

	rr.elapsed = float64(time.Since(start).Nanoseconds()) / 1e6
	t, c := parseICMP(buf)
	if t == 3 && c == 3 { // Destination port unreachable, type==3 && code==3
		rr.done = true
	} else if t != 11 { // Time Exceeded, type==11 && code in (0,1)
		return rr
	}
	rr.ok = true
	rr.ip = toStr(from)
	addrs, err := net.LookupAddr(rr.ip)
	if err != nil {
		rr.addr = rr.ip
	} else {
		rr.addr = addrs[0]
	}
	return rr
}
Exemplo n.º 5
0
Arquivo: trace.go Projeto: mag-/gtr
// Traceroute executes traceroute to given destination, using options from TracerouteOptions
// and sending updates to chan c
//
// Outbound packets are UDP packets and inbound packets are ICMP.
//
// Returns an error or nil if no error occurred
func Traceroute(dest *net.IPAddr, options *TracerouteOptions, c chan TraceUpdate) (err error) {
	var destAddr [4]byte
	copy(destAddr[:], dest.IP.To4())
	socketAddr, err := getSocketAddr()
	if err != nil {
		return
	}

	timeoutMs := (int64)(options.TimeoutMs)
	tv := syscall.NsecToTimeval(1000 * 1000 * timeoutMs)

	ttl := 1
	for {
		// Set up receiving socket
		recvSocket, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_ICMP)
		if err != nil {
			log.Fatal("Cannot setup receive socket, please run as root or with CAP_NET_RAW permissions")
			return err
		}
		// Set up sending socket
		sendSocket, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
		if err != nil {
			log.Fatal("Cannot setup sending socket")
			return err
		}

		start := time.Now()
		syscall.SetsockoptInt(sendSocket, 0x0, syscall.IP_TTL, ttl)
		syscall.SetsockoptTimeval(recvSocket, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &tv)
		syscall.Bind(recvSocket, &syscall.SockaddrInet4{Port: options.Port, Addr: socketAddr})
		syscall.Sendto(sendSocket, []byte{0x0}, 0, &syscall.SockaddrInet4{Port: options.Port, Addr: destAddr})

		var p = make([]byte, options.PacketSize)
		n, from, err := syscall.Recvfrom(recvSocket, p, 0)
		elapsed := time.Since(start)
		if err == nil {
			currAddr := from.(*syscall.SockaddrInet4).Addr
			hop := TraceUpdate{Success: true, Address: currAddr, N: n, ElapsedTime: elapsed, TTL: ttl}
			currHost, err := net.LookupAddr(hop.addressString())
			if err == nil {
				hop.Host = currHost[0]
			}
			// Send update
			c <- hop
			ttl += 1
			// We reached the destination
			if ttl > options.MaxTTL || currAddr == destAddr {
				ttl = 1
			}
		} else {
			c <- TraceUpdate{Success: false, TTL: ttl}
			ttl += 1
		}
		syscall.Close(recvSocket)
		syscall.Close(sendSocket)
	}
}
Exemplo n.º 6
0
// Dial creates a new protected connection, it assumes that the address has
// already been resolved to an IPv4 address.
// - syscall API calls are used to create and bind to the
//   specified system device (this is primarily
//   used for Android VpnService routing functionality)
func Dial(network, addr string, timeout time.Duration) (net.Conn, error) {
	host, port, err := SplitHostPort(addr)
	if err != nil {
		return nil, err
	}

	conn := &ProtectedConn{
		port: port,
	}
	// do DNS query
	IPAddr := net.ParseIP(host)
	if IPAddr == nil {
		log.Printf("Couldn't parse IP address %v while port:%d", host, port)
		return nil, err
	}

	copy(conn.ip[:], IPAddr.To4())
	var socketFd int
	//var err error
	switch network {
	case "udp", "udp4", "udp6":
		socketFd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, 0)
	default:
		socketFd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
	}
	//socketFd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
	if err != nil {
		log.Printf("Could not create socket: %v", err)
		return nil, err
	}
	conn.socketFd = socketFd

	defer conn.cleanup()

	// Actually protect the underlying socket here
	err = currentProtect(conn.socketFd)
	if err != nil {
		return nil, fmt.Errorf("Could not bind socket to system device: %v", err)
	}

	err = conn.connectSocket()
	if err != nil {
		log.Printf("Could not connect to %s socket: %v", addr, err)
		return nil, err
	}

	// finally, convert the socket fd to a net.Conn
	err = conn.convert()
	if err != nil {
		log.Printf("Error converting protected connection: %v", err)
		return nil, err
	}

	//conn.Conn.SetDeadline(time.Now().Add(timeout))
	return conn, nil
}
Exemplo n.º 7
0
func Hop(port, ttl int, IP_addr net.IP) (*Hop_ret, error) {

	ret_addr := net.IPv4(0, 0, 0, 0)
	success := false
	// make sockets
	send_udp_s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
	if err != nil {
		return nil, err
	}
	recv_icmp_s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_ICMP)
	if err != nil {
		return nil, err
	}

	//editing TTL value for outgoing IPv4 packets
	if err := syscall.SetsockoptInt(send_udp_s, syscall.SOL_IP, syscall.IP_TTL, ttl); err != nil {
		return nil, err
	}
	tv := syscall.NsecToTimeval(1000 * 1000 * TIME_OUT_MS)
	syscall.SetsockoptTimeval(recv_icmp_s, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &tv)

	defer syscall.Close(send_udp_s)
	defer syscall.Close(recv_icmp_s)

	//connect sockets
	if err := syscall.Bind(recv_icmp_s, &syscall.SockaddrInet4{Port: port, Addr: [4]byte{137, 224, 226, 47}}); err != nil {
		return nil, err
	}

	//send udp-packet
	var IP [4]byte
	copy(IP[:], IP_addr.To4())
	if err := syscall.Sendto(send_udp_s, []byte{0x42, 0x42}, 0, &syscall.SockaddrInet4{Port: 1337, Addr: IP}); err != nil {
		return nil, err
	}

	//receive ICMP
	recv_buffer := make([]byte, 4096)
	_, _, err = syscall.Recvfrom(recv_icmp_s, recv_buffer, 0)
	if err == nil {
		header, err := ipv4.ParseHeader(recv_buffer)
		if err != nil {
			log.Errorf("%q", err)
		}
		success = true
		ret_addr = header.Src
	} else {
		//time out
		success = false
		ret_addr = net.IPv4(0, 0, 0, 0)
		//log.Errorf("%q", err)
	}
	//resolve (timeout) errors, retry or return false...
	return &Hop_ret{Addr: ret_addr, TTL: ttl, success: success}, nil
}
Exemplo n.º 8
0
/*
	c.sa = new(syscall.SockaddrInet4)
	c.sa.Addr = [4]byte{10, 1, 1, 131}
	c.sa.Port = port
*/
func (c *Worker) socket() {
	begin := time.Now()
	s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
	if err != nil {
		syscall.Close(s)
		return
	}

	err = syscall.Connect(s, nil) //TODO
	if err != nil {
		lg(err)
		syscall.Close(s)
		return
	}

	_, err = syscall.Write(s, message.content)
	if err != nil {
		syscall.Close(s)
		return
	}

	_, err = syscall.Read(s, c.data)
	if err != nil {
		syscall.Close(s)
		return
	}

	syscall.Close(s)
	time.Now().Sub(begin)
}
Exemplo n.º 9
0
func (b *ax25Beacon) Now() error {
	// Create file descriptor
	//REVIEW: Should we keep it for next beacon?
	var socket fd
	if f, err := syscall.Socket(syscall.AF_AX25, syscall.SOCK_DGRAM, 0); err != nil {
		return err
	} else {
		socket = fd(f)
	}
	defer socket.close()

	if err := socket.bind(b.localAddr); err != nil {
		return fmt.Errorf("bind: %s", err)
	}

	msg := C.CString(b.message)
	_, err := C.sendto(
		C.int(socket),
		unsafe.Pointer(msg),
		C.size_t(len(b.message)),
		0,
		(*C.struct_sockaddr)(unsafe.Pointer(&b.remoteAddr)),
		C.socklen_t(unsafe.Sizeof(b.remoteAddr)),
	)

	return err
}
Exemplo n.º 10
0
func (w *Worker) createRawSocket() (fd int) {

	socket, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_TCP)
	if err != nil {

		fmt.Fprintf(os.Stderr, "fail to Socket :%s\n", err.Error())
		os.Exit(1)
	}

	err = syscall.SetsockoptString(socket, syscall.IPPROTO_IP, syscall.IP_HDRINCL, "1")
	if err != nil {
		fmt.Fprintf(os.Stderr, "SetsockoptString error :%s\ns", err.Error())
		os.Exit(1)
	}

	timeVal := new(syscall.Timeval)
	timeVal.Sec = 6
	err = syscall.SetsockoptTimeval(socket, syscall.SOL_SOCKET, syscall.SO_SNDTIMEO, timeVal)
	if err != nil {
		fmt.Fprintf(os.Stderr, "SetsockoptTimeval error :%s", err.Error())
		os.Exit(1)
	}

	return socket
}
Exemplo n.º 11
0
// Should we try to use the IPv4 socket interface if we're
// only dealing with IPv4 sockets?  As long as the host system
// understands IPv6, it's okay to pass IPv4 addresses to the IPv6
// interface.  That simplifies our code and is most general.
// Unfortunately, we need to run on kernels built without IPv6 support too.
// So probe the kernel to figure it out.
func kernelSupportsIPv6() bool {
	fd, e := syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
	if fd >= 0 {
		syscall.Close(fd)
	}
	return e == 0
}
Exemplo n.º 12
0
func mcastOpen(bindAddr net.IP, port int, ifname string) (*ipv4.PacketConn, *net.UDPConn, error) {
	s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
	if err != nil {
		log.Fatal(err)
	}
	if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
		log.Fatal(err)
	}
	//syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1)
	if err := syscall.SetsockoptString(s, syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, ifname); err != nil {
		log.Fatal(err)
	}

	lsa := syscall.SockaddrInet4{Port: port}
	copy(lsa.Addr[:], bindAddr.To4())

	if err := syscall.Bind(s, &lsa); err != nil {
		syscall.Close(s)
		log.Fatal(err)
	}
	f := os.NewFile(uintptr(s), "")
	c, err := net.FilePacketConn(f)
	f.Close()
	if err != nil {
		log.Fatal(err)
	}
	u := c.(*net.UDPConn)
	p := ipv4.NewPacketConn(c)

	return p, u, nil
}
Exemplo n.º 13
0
func main() {
	acceptingFd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
	check(err)

	addr := &syscall.SockaddrInet4{Port: 3000, Addr: [4]byte{0, 0, 0, 0}}
	err = syscall.Bind(acceptingFd, addr)
	check(err)

	err = syscall.Listen(acceptingFd, 100)
	check(err)

	for {
		connectionFd, _, err := syscall.Accept(acceptingFd)
		check(err)
		fmt.Println("Accepted new connectrion")

		data := make([]byte, 1024)
		_, err = syscall.Read(connectionFd, data)
		check(err)
		fmt.Printf("Received: %s\n", string(data))

		_, err = syscall.Write(connectionFd, data)
		check(err)

		err = syscall.Close(connectionFd)
		check(err)
	}
}
Exemplo n.º 14
0
func (nlSock *NLSocket) Init() error {
	//16 - NETLINK_GENERIC
	sd, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_DGRAM, NETLINK_GENERIC)
	if err != nil {
		return fmt.Errorf("cant create netlink socket %v\n", err)
	}
	pid := uint32(syscall.Getpid())
	sa := &syscall.SockaddrNetlink{
		Pid:    pid,
		Groups: 0,
		Family: syscall.AF_NETLINK}
	if err = syscall.Bind(sd, sa); err != nil {
		return fmt.Errorf("cant bind to netlink socket: %v\n", err)
	}
	nlSock.Lock = new(sync.Mutex)
	nlSock.Sd = sd
	nlSock.Seq = 0
	nlSock.PortID = pid
	for k, v := range LookupOnStartup {
		familyId, err := nlSock.ResolveFamily(NulStringType(k))
		if err != nil {
			return err
		}
		CreateMsgType(v, uint16(*familyId))
		MT2Family[k] = uint16(*familyId)
	}
	return nil
}
Exemplo n.º 15
0
func advert(_ net.PacketConn, src, dst net.IP, p *net.IPNet) error {
	s, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP)
	if err != nil {
		return err
	}
	syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
	syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1)
	syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
	pdst := dst
	if *useLimited && runtime.GOOS == "freebsd" {
		dst = directed(p)
		syscall.SetsockoptInt(s, syscall.IPPROTO_IP, 0x17, 1) // IP_ONESBCAST
	}
	sa := &syscall.SockaddrInet4{Port: *port}
	copy(sa.Addr[:], src.To4())
	if err := syscall.Bind(s, sa); err != nil {
		syscall.Close(s)
		return err
	}
	f := os.NewFile(uintptr(s), fmt.Sprintf("udp:%v->", src))
	c, err := net.FilePacketConn(f)
	f.Close()
	if err != nil {
		return err
	}
	defer c.Close()
	// If you are lucky, you can see that on some platform the
	// kernel sometimes transmits a wrong frame addressed to IPv4
	// limited broadcast address with some nexthop's link-layer
	// address on a broadcast-capable link.
	// In general, using BPF for transmitting IPv4 limited
	// broadcast addresses is a reasonable choice.
	_, err = c.WriteTo([]byte(fmt.Sprintf("%s-%v", runtime.GOOS, pdst)), &net.UDPAddr{IP: dst, Port: *port})
	return err
}
Exemplo n.º 16
0
func (io *NetIOManager) ProxyNetListen(sa syscall.Sockaddr) error {
	serverfd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM,
		syscall.IPPROTO_TCP)
	if err != nil {
		goto Error
	}

	err = syscall.Bind(serverfd, sa)
	if err != nil {
		goto Cleanup
	}

	err = syscall.Listen(serverfd, io.max_backlog)
	if err != nil {
		goto Cleanup
	}

	err = syscall.EpollCtl(io.epoll_fd, syscall.EPOLL_CTL_ADD, serverfd,
		&syscall.EpollEvent{Events: syscall.EPOLLIN, Fd: int32(serverfd)})
	if err != nil {
		goto Cleanup
	}

	io.proxy_server_fd = serverfd
	return nil

Cleanup:
	syscall.Close(serverfd)
Error:
	return err
}
Exemplo n.º 17
0
Arquivo: main.go Projeto: nhooyr/dos
func main() {
	log.SetPrefix("")
	log.SetFlags(0)
	if os.Geteuid() != 0 {
		log.Fatal(errors.New("please run as root"))
	}
	fd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_RAW, syscall.IPPROTO_RAW)
	check(err)
	if len(os.Args) < 3 {
		log.Fatal("usage: synflood <victimIP> <spoofedIP>")
	}
	raddr := net.ParseIP(os.Args[1])
	addr := syscall.SockaddrInet4{
		Port: 0,
		Addr: to4Array(raddr),
	}
	p := packet(raddr)
	switch runtime.GOOS {
	case "darwin", "dragonfly", "freebsd", "netbsd":
		// need to set explicitly
		check(syscall.SetsockoptInt(fd, syscall.IPPROTO_IP, syscall.IP_HDRINCL, 1))
		// no need to receive anything
		check(syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, 1))
	case "linux":
		// no need to receive anything
		check(syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, 0))
	}
	for {
		check(syscall.Sendto(fd, p, 0, &addr))
	}
}
Exemplo n.º 18
0
// NewReusablePortPacketConn returns net.FileListener that created from a file discriptor for a socket with SO_REUSEPORT option.
func NewReusablePortPacketConn(proto, addr string) (l net.PacketConn, err error) {
	var (
		soType, fd int
		file       *os.File
		sockaddr   syscall.Sockaddr
	)

	if sockaddr, soType, err = getSockaddr(proto, addr); err != nil {
		return nil, err
	}

	if fd, err = syscall.Socket(soType, syscall.SOCK_DGRAM, syscall.IPPROTO_UDP); err != nil {
		return nil, err
	}

	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, reusePort, 1); err != nil {
		return nil, err
	}

	if err = syscall.Bind(fd, sockaddr); err != nil {
		return nil, err
	}

	// File Name get be nil
	file = os.NewFile(uintptr(fd), filePrefix+strconv.Itoa(os.Getpid()))
	if l, err = net.FilePacketConn(file); err != nil {
		return nil, err
	}

	if err = file.Close(); err != nil {
		return nil, err
	}

	return l, err
}
Exemplo n.º 19
0
func DriverName(intf string) (string, error) {
	fd, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, syscall.IPPROTO_IP)
	if err != nil {
		return "", err
	}

	drvinfo := ethtoolDrvInfo{
		cmd: ETHTOOL_GDRVINFO,
	}

	var name [IFNAMSIZ]byte
	copy(name[:], []byte(intf))

	ifr := ifreq{
		ifr_name: name,
		ifr_data: uintptr(unsafe.Pointer(&drvinfo)),
	}

	_, _, ep := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), SIOCETHTOOL, uintptr(unsafe.Pointer(&ifr)))
	if ep != 0 {
		return "", syscall.Errno(ep)
	}

	return string(bytes.Trim(drvinfo.driver[:], "\x00")), nil
}
Exemplo n.º 20
0
// Disable TX checksum offload on specified interface
func EthtoolTXOff(name string) error {
	if len(name)+1 > IFNAMSIZ {
		return fmt.Errorf("name too long")
	}

	socket, err := syscall.Socket(syscall.AF_INET, syscall.SOCK_DGRAM, 0)
	if err != nil {
		return err
	}
	defer syscall.Close(socket)

	// Request current value
	value := EthtoolValue{Cmd: ETHTOOL_GTXCSUM}
	request := IFReqData{Data: uintptr(unsafe.Pointer(&value))}
	copy(request.Name[:], name)

	if err := ioctlEthtool(socket, uintptr(unsafe.Pointer(&request))); err != nil {
		return err
	}
	if value.Data == 0 { // if already off, don't try to change
		return nil
	}

	value = EthtoolValue{ETHTOOL_STXCSUM, 0}
	return ioctlEthtool(socket, uintptr(unsafe.Pointer(&request)))
}
Exemplo n.º 21
0
// Dials a netlink socket.  Usually you do not need permissions for this,
// though specific commands may be rejected.
func Dial(nlf NetlinkFamily) (rwc *Socket, err error) {
	fdno, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_DGRAM, int(nlf))
	if err == nil {
		rwc = &Socket{fd: fdno}
	}
	return
}
Exemplo n.º 22
0
Arquivo: socket.go Projeto: htee/hteed
func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
	var probes = []struct {
		laddr net.TCPAddr
		value int
		ok    bool
	}{
		// IPv6 communication capability
		{laddr: net.TCPAddr{IP: net.ParseIP("::1")}, value: 1},
		// IPv6 IPv4-mapped address communication capability
		{laddr: net.TCPAddr{IP: net.IPv4(127, 0, 0, 1)}, value: 0},
	}

	for i := range probes {
		s, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
		if err != nil {
			continue
		}
		defer closesocket(s)
		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, probes[i].value)
		sa, err := sockaddrTCP(&probes[i].laddr, syscall.AF_INET6)
		if err != nil {
			continue
		}
		if err := syscall.Bind(s, sa); err != nil {
			continue
		}
		probes[i].ok = true
	}

	return probes[0].ok, probes[1].ok
}
Exemplo n.º 23
0
func (k *PosixKernel) Socket(domain, typ, protocol int) uint64 {
	fd, err := syscall.Socket(domain, typ, protocol)
	if err != nil {
		return Errno(err)
	}
	return uint64(fd)
}
Exemplo n.º 24
0
// Bind our netlink socket and
// send a listen control message to the connector driver.
func (listener *netlinkListener) bind() error {
	sock, err := syscall.Socket(
		syscall.AF_NETLINK,
		syscall.SOCK_DGRAM,
		syscall.NETLINK_CONNECTOR)

	if err != nil {
		return err
	}

	listener.sock = sock
	listener.addr = &syscall.SockaddrNetlink{
		Family: syscall.AF_NETLINK,
		Groups: _CN_IDX_PROC,
		Pid:    uint32(os.Getpid()),
	}

	err = syscall.Bind(listener.sock, listener.addr)

	if err != nil {
		return err
	}

	return listener.send(_PROC_CN_MCAST_LISTEN)
}
Exemplo n.º 25
0
func TestMonitorAndParseRIB(t *testing.T) {
	if testing.Short() || os.Getuid() != 0 {
		t.Skip("must be root")
	}

	// We suppose that using an IPv4 link-local address and the
	// dot1Q ID for Token Ring and FDDI doesn't harm anyone.
	pv := &propVirtual{addr: "169.254.0.1", mask: "255.255.255.0"}
	if err := pv.configure(1002); err != nil {
		t.Skip(err)
	}
	if err := pv.setup(); err != nil {
		t.Skip(err)
	}
	pv.teardown()

	s, err := syscall.Socket(syscall.AF_ROUTE, syscall.SOCK_RAW, syscall.AF_UNSPEC)
	if err != nil {
		t.Fatal(err)
	}
	defer syscall.Close(s)

	go func() {
		b := make([]byte, os.Getpagesize())
		for {
			n, err := syscall.Read(s, b)
			if err != nil {
				return
			}
			ms, err := ParseRIB(0, b[:n])
			if err != nil {
				t.Error(err)
				return
			}
			ss, err := msgs(ms).validate()
			if err != nil {
				t.Error(err)
				return
			}
			for _, s := range ss {
				t.Log(s)
			}
		}
	}()

	for _, vid := range []int{1002, 1003, 1004, 1005} {
		pv := &propVirtual{addr: "169.254.0.1", mask: "255.255.255.0"}
		if err := pv.configure(vid); err != nil {
			t.Fatal(err)
		}
		if err := pv.setup(); err != nil {
			t.Fatal(err)
		}
		time.Sleep(200 * time.Millisecond)
		if err := pv.teardown(); err != nil {
			t.Fatal(err)
		}
		time.Sleep(200 * time.Millisecond)
	}
}
Exemplo n.º 26
0
// Create a tcp socket, setting the TCP_FASTOPEN socket option.
func (s *TFOServer) Bind() (err error) {

	s.fd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
	if err != nil {
		if err == syscall.ENOPROTOOPT {
			err = errors.New("TCP Fast Open server support is unavailable (unsupported kernel).")
		}
		return
	}

	err = syscall.SetsockoptInt(s.fd, syscall.SOL_TCP, TCP_FASTOPEN, 1)
	if err != nil {
		err = errors.New(fmt.Sprintf("Failed to set necessary TCP_FASTOPEN socket option: %s", err))
		return
	}

	sa := &syscall.SockaddrInet4{Addr: s.ServerAddr, Port: s.ServerPort}

	err = syscall.Bind(s.fd, sa)
	if err != nil {
		err = errors.New(fmt.Sprintf("Failed to bind to Addr: %v, Port: %d, Reason: %s", s.ServerAddr, s.ServerPort, err))
		return
	}

	log.Printf("Server: Bound to addr: %v, port: %d\n", s.ServerAddr, s.ServerPort)

	err = syscall.Listen(s.fd, LISTEN_BACKLOG)
	if err != nil {
		err = errors.New(fmt.Sprintf("Failed to listen: %s", err))
		return
	}

	return

}
Exemplo n.º 27
0
// Should we try to use the IPv4 socket interface if we're
// only dealing with IPv4 sockets?  As long as the host system
// understands IPv6, it's okay to pass IPv4 addresses to the IPv6
// interface.  That simplifies our code and is most general.
// Unfortunately, we need to run on kernels built without IPv6
// support too.  So probe the kernel to figure it out.
//
// probeIPv6Stack probes both basic IPv6 capability and IPv6 IPv4-
// mapping capability which is controlled by IPV6_V6ONLY socket
// option and/or kernel state "net.inet6.ip6.v6only".
// It returns two boolean values.  If the first boolean value is
// true, kernel supports basic IPv6 functionality.  If the second
// boolean value is true, kernel supports IPv6 IPv4-mapping.
func probeIPv6Stack() (supportsIPv6, supportsIPv4map bool) {
	var probes = []struct {
		la TCPAddr
		ok bool
	}{
		// IPv6 communication capability
		{TCPAddr{IP: ParseIP("::1")}, false},
		// IPv6 IPv4-mapped address communication capability
		{TCPAddr{IP: IPv4(127, 0, 0, 1)}, false},
	}

	for i := range probes {
		s, err := syscall.Socket(syscall.AF_INET6, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
		if err != nil {
			continue
		}
		defer closesocket(s)
		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, 0)
		sa, err := probes[i].la.toAddr().sockaddr(syscall.AF_INET6)
		if err != nil {
			continue
		}
		err = syscall.Bind(s, sa)
		if err != nil {
			continue
		}
		probes[i].ok = true
	}

	return probes[0].ok, probes[1].ok
}
Exemplo n.º 28
0
// Socket wraps syscall.Socket.
func (sw *Switch) Socket(family, sotype, proto int) (s int, err error) {
	so := &Status{Cookie: cookie(family, sotype, proto)}
	sw.fmu.RLock()
	f, _ := sw.fltab[FilterSocket]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {
		return -1, err
	}
	s, so.Err = syscall.Socket(family, sotype, proto)
	if err = af.apply(so); err != nil {
		if so.Err == nil {
			syscall.Close(s)
		}
		return -1, err
	}

	if so.Err != nil {
		return -1, so.Err
	}
	sw.smu.Lock()
	nso := sw.addLocked(s, family, sotype, proto)
	sw.stats.getLocked(nso.Cookie).Opened++
	sw.smu.Unlock()
	return s, nil
}
Exemplo n.º 29
0
// Socket wraps syscall.Socket.
func (sw *Switch) Socket(family, sotype, proto int) (s syscall.Handle, err error) {
	so := &Status{Cookie: cookie(family, sotype, proto)}
	sw.fmu.RLock()
	f, _ := sw.fltab[FilterSocket]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {
		return syscall.InvalidHandle, err
	}
	s, so.Err = syscall.Socket(family, sotype, proto)
	if err = af.apply(so); err != nil {
		if so.Err == nil {
			syscall.Closesocket(s)
		}
		return syscall.InvalidHandle, err
	}

	sw.smu.Lock()
	defer sw.smu.Unlock()
	if so.Err != nil {
		sw.stats.getLocked(so.Cookie).OpenFailed++
		return syscall.InvalidHandle, so.Err
	}
	nso := sw.addLocked(s, family, sotype, proto)
	sw.stats.getLocked(nso.Cookie).Opened++
	return s, nil
}
Exemplo n.º 30
0
// Create a tcp socket and send data on it. This uses the sendto() system call
// instead of connect() - because connect() calls does not support sending
// data in the syn packet, but the sendto() system call does (as often used in
// connectionless protocols such as udp.
func (c *TFOClient) Send() (err error) {

	c.fd, err = syscall.Socket(syscall.AF_INET, syscall.SOCK_STREAM, 0)
	if err != nil {
		return
	}
	defer syscall.Close(c.fd)

	sa := &syscall.SockaddrInet4{Addr: c.ServerAddr, Port: c.ServerPort}

	// Data to appear, if an existing tcp fast open cookie is available, this
	// data will appear in the SYN packet, if not, it will appear in the ACK.
	data := []byte("Hello TCP Fast Open")

	log.Printf("Client: Sending to server: %#v\n", string(data))

	// Use the sendto() syscall, instead of connect()
	err = syscall.Sendto(c.fd, data, syscall.MSG_FASTOPEN, sa)
	if err != nil {
		if err == syscall.EOPNOTSUPP {
			err = errors.New("TCP Fast Open client support is unavailable (unsupported kernel or disabled, see /proc/sys/net/ipv4/tcp_fastopen).")
		}
		err = errors.New(fmt.Sprintf("Received error in sendTo():", err))
		return
	}

	// Note, this exists before waiting for response and is meant to illustrate
	// the use of the sendto() system call, not of a complete and proper socket
	// setup and teardown processes.

	return
}