func (f *file) Open() (Reader, error) {
	f.fs.mu.Lock()
	defer f.fs.mu.Unlock()
	if f.fs.open < 0 {
		return nil, ErrClosed
	}
	if f.open {
		return nil, errFileOpen
	}
	of, err := os.OpenFile(f.path(), os.O_RDONLY, 0)
	if err != nil {
		if f.hasOldName() && os.IsNotExist(err) {
			of, err = os.OpenFile(f.oldPath(), os.O_RDONLY, 0)
			if err == nil {
				goto ok
			}
		}
		return nil, err
	}
ok:
	fdtrack.Open("leveldb")
	f.open = true
	f.fs.open++
	return fileWrap{of, f}, nil
}
Esempio n. 2
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// NewHTTPUClient creates a new HTTPUClient, opening up a new UDP socket for the
// purpose.
func NewHTTPUClient() (*HTTPUClient, error) {
	conn, err := net.ListenPacket("udp", ":0")
	if err != nil {
		return nil, err
	}
	fdtrack.Open("upnp")
	return &HTTPUClient{conn: conn}, nil
}
Esempio n. 3
0
// ListenUDP returns a new table that listens for UDP packets on laddr.
func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string) (*Table, error) {
	addr, err := net.ResolveUDPAddr("udp", laddr)
	if err != nil {
		return nil, err
	}
	fdtrack.Open("p2p")
	conn, err := net.ListenUDP("udp", addr)
	if err != nil {
		return nil, err
	}
	tab, _ := newUDP(priv, conn, natm, nodeDBPath)
	glog.V(logger.Info).Infoln("Listening,", tab.self)
	return tab, nil
}
func (f *file) Create() (Writer, error) {
	f.fs.mu.Lock()
	defer f.fs.mu.Unlock()
	if f.fs.open < 0 {
		return nil, ErrClosed
	}
	if f.open {
		return nil, errFileOpen
	}
	of, err := os.OpenFile(f.path(), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
	if err != nil {
		return nil, err
	}
	fdtrack.Open("leveldb")
	f.open = true
	f.fs.open++
	return fileWrap{of, f}, nil
}
Esempio n. 5
0
func (n *Client) rpc(msg []byte, resultSize int) (result []byte, err error) {
	var server net.UDPAddr
	server.IP = n.gateway
	server.Port = nAT_PMP_PORT
	conn, err := net.DialUDP("udp", nil, &server)
	if err != nil {
		return
	}
	fdtrack.Open("natpmp")
	defer fdtrack.Close("natpmp")
	defer conn.Close()

	result = make([]byte, resultSize)

	needNewDeadline := true

	var tries uint
	for tries = 0; tries < nAT_TRIES; {
		if needNewDeadline {
			err = conn.SetDeadline(time.Now().Add((nAT_INITIAL_MS << tries) * time.Millisecond))
			if err != nil {
				return
			}
			needNewDeadline = false
		}
		_, err = conn.Write(msg)
		if err != nil {
			return
		}
		var bytesRead int
		var remoteAddr *net.UDPAddr
		bytesRead, remoteAddr, err = conn.ReadFromUDP(result)
		if err != nil {
			if err.(net.Error).Timeout() {
				tries++
				needNewDeadline = true
				continue
			}
			return
		}
		if !remoteAddr.IP.Equal(n.gateway) {
			log.Printf("Ignoring packet because IPs differ:", remoteAddr, n.gateway)
			// Ignore this packet.
			// Continue without increasing retransmission timeout or deadline.
			continue
		}
		if bytesRead != resultSize {
			err = fmt.Errorf("unexpected result size %d, expected %d", bytesRead, resultSize)
			return
		}
		if result[0] != 0 {
			err = fmt.Errorf("unknown protocol version %d", result[0])
			return
		}
		expectedOp := msg[1] | 0x80
		if result[1] != expectedOp {
			err = fmt.Errorf("Unexpected opcode %d. Expected %d", result[1], expectedOp)
			return
		}
		resultCode := readNetworkOrderUint16(result[2:4])
		if resultCode != 0 {
			err = fmt.Errorf("Non-zero result code %d", resultCode)
			return
		}
		// If we got here the RPC is good.
		return
	}
	err = fmt.Errorf("Timed out trying to contact gateway")
	return
}