Example #1
0
// getConn is used to get a connection from the pool
func (n *NetworkTransport) getConn(target net.Addr) (*netConn, error) {
	// Check for a pooled conn
	if conn := n.getPooledConn(target); conn != nil {
		return conn, nil
	}

	// Dial a new connection
	conn, err := n.stream.Dial(target.String(), n.timeout)
	if err != nil {
		return nil, err
	}

	// Wrap the conn
	netConn := &netConn{
		target: target,
		conn:   conn,
		r:      bufio.NewReader(conn),
		w:      bufio.NewWriter(conn),
	}

	// Setup encoder/decoders
	netConn.dec = codec.NewDecoder(netConn.r, &codec.MsgpackHandle{})
	netConn.enc = codec.NewEncoder(netConn.w, &codec.MsgpackHandle{})

	// Done
	return netConn, nil
}
Example #2
0
func packetDump(addr net.Addr, data []byte, cache TemplateCache) {
	p, err := nf9packet.Decode(data)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		return
	}

	templateList := p.TemplateRecords()
	flowSets := p.DataFlowSets()

	for _, t := range templateList {
		templateKey := fmt.Sprintf("%s|%b|%v", addr.String(), p.SourceId, t.TemplateId)
		cache[templateKey] = t
	}

	for _, set := range flowSets {
		templateKey := fmt.Sprintf("%s|%b|%v", addr.String(), p.SourceId, set.Id)
		template, ok := cache[templateKey]
		if !ok {
			// We do not have template for this Data FlowSet yet
			continue
		}

		records := template.DecodeFlowSet(&set)
		if records == nil {
			// Error in decoding Data FlowSet
			continue
		}
		printTable(template, records)
	}
}
Example #3
0
// newAuthAddr returns a string from a net.Addr used to index the address the key in our lookup.
func newAuthAddr(addr net.Addr) string {
	if addr == nil {
		return ""
	}
	host, _, _ := net.SplitHostPort(addr.String())
	return host
}
Example #4
0
func (m *connManager) New(addr net.Addr) chan []byte {
	reqChan := make(chan []byte, 64) // TODO (better value)
	m.Lock()
	m.reqMap[addr.String()] = reqChan
	m.Unlock()
	return reqChan
}
Example #5
0
func (udp *udpProxySocket) getBackendConn(activeClients *clientCache, cliAddr net.Addr, proxier *Proxier, service proxy.ServicePortName, timeout time.Duration) (net.Conn, error) {
	activeClients.mu.Lock()
	defer activeClients.mu.Unlock()

	svrConn, found := activeClients.clients[cliAddr.String()]
	if !found {
		// TODO: This could spin up a new goroutine to make the outbound connection,
		// and keep accepting inbound traffic.
		glog.V(3).Infof("New UDP connection from %s", cliAddr)
		var err error
		svrConn, err = tryConnect(service, cliAddr, "udp", proxier)
		if err != nil {
			return nil, err
		}
		if err = svrConn.SetDeadline(time.Now().Add(timeout)); err != nil {
			glog.Errorf("SetDeadline failed: %v", err)
			return nil, err
		}
		activeClients.clients[cliAddr.String()] = svrConn
		go func(cliAddr net.Addr, svrConn net.Conn, activeClients *clientCache, timeout time.Duration) {
			defer util.HandleCrash()
			udp.proxyClient(cliAddr, svrConn, activeClients, timeout)
		}(cliAddr, svrConn, activeClients, timeout)
	}
	return svrConn, nil
}
Example #6
0
func runListener(listenPacket listenPacketFunc, port *port, dataChan chan<- []byte, stopChan <-chan struct{}) (err error) {
	conn, err := listenPacket(fmt.Sprintf(":%d", port.Get()))
	if err != nil {
		return
	}
	port.Set(conn.Port())

	go func() {
		<-stopChan
		conn.Close()
	}()

	for {
		buffer := make([]byte, 4096)
		var n int
		var addr net.Addr
		n, addr, err = conn.ReadFrom(buffer) // errors returned from here are used for control
		if err != nil {
			return
		}

		if n == 0 {
			log.Printf("Warning: zero bytes read from client: %v\n", addr.String())
		} else {
			dataChan <- buffer[0:n]
		}
	}
}
Example #7
0
File: rtp.go Project: hyuni/mimic
func NewSession(transportDesc string, remoteAddr net.Addr) (s *Session) {
	s = &Session{}

	// deserialize input data
	parts := strings.Split(transportDesc, ";")
	s.SessionType = parts[0]
	s.SessionMode = parts[1]
	paramsMap := map[string]string{}
	for _, v := range parts[2:] {
		pair := strings.Split(v, "=")
		paramsMap[pair[0]] = pair[1]
	}
	s.ClientPort = strings.Split(paramsMap["client_port"], "-")[0]

	// pick a random udp port
	ip := strings.Split(remoteAddr.String(), ":")[0]
	conn, err := net.Dial("udp", fmt.Sprintf("%s:%s", ip, s.ClientPort))
	if err != nil {
		fmt.Println(err)
		return
	}
	s.ServerPort = strings.Split(conn.LocalAddr().String(), ":")[1]
	s.conn = conn
	s.Id = strconv.Itoa(rand.Int())
	s.start = time.Now()
	sessions[s.Id] = s
	return
}
Example #8
0
func officialAddr(unresolvedAddr string, resolvedAddr net.Addr) (*util.UnresolvedAddr, error) {
	unresolvedHost, unresolvedPort, err := net.SplitHostPort(unresolvedAddr)
	if err != nil {
		return nil, err
	}

	resolvedHost, resolvedPort, err := net.SplitHostPort(resolvedAddr.String())
	if err != nil {
		return nil, err
	}

	var host string
	if unresolvedHost != "" {
		// A host was provided, use it.
		host = unresolvedHost
	} else {
		// A host was not provided. Ask the system, and fall back to the listener.
		if hostname, err := os.Hostname(); err == nil {
			host = hostname
		} else {
			host = resolvedHost
		}
	}

	var port string
	if unresolvedPort != "0" {
		// A port was provided, use it.
		port = unresolvedPort
	} else {
		// A port was not provided, but the system assigned one.
		port = resolvedPort
	}

	return util.NewUnresolvedAddr(resolvedAddr.Network(), net.JoinHostPort(host, port)), nil
}
Example #9
0
func (ct *codecTransport) Dial(addr net.Addr) (codec.CarrierConn, error) {
	c, err := net.Dial("tcp", addr.String())
	if err != nil {
		return nil, err
	}
	return newCodecConn(trace.NewFrame("hmac", "dial"), c.(*net.TCPConn), ct.key)
}
Example #10
0
func (fw *firewall) Dial(addr net.Addr) (net.Conn, error) {
	if fw.rule != nil && !fw.rule.Match(addr) {
		return nil, &net.OpError{Op: "dial", Net: addr.Network(), Addr: addr, Err: errors.New("unreachable host")}
	}

	return fw.t.Dial(addr)
}
Example #11
0
// start initializes the infostore with the rpc server address and
// then begins processing connecting clients in an infinite select
// loop via goroutine. Periodically, clients connected and awaiting
// the next round of gossip are awoken via the conditional variable.
func (s *server) start(grpcServer *grpc.Server, addr net.Addr) {
	s.mu.Lock()
	s.is.NodeAddr = util.MakeUnresolvedAddr(addr.Network(), addr.String())
	s.mu.Unlock()
	RegisterGossipServer(grpcServer, s)

	broadcast := func() {
		ready := make(chan struct{})

		s.mu.Lock()
		close(s.ready)
		s.ready = ready
		s.mu.Unlock()
	}
	unregister := s.is.registerCallback(".*", func(_ string, _ roachpb.Value) {
		broadcast()
	})

	s.stopper.RunWorker(func() {
		<-s.stopper.ShouldDrain()

		s.mu.Lock()
		unregister()
		s.mu.Unlock()

		broadcast()
	})
}
Example #12
0
func startGossipAtAddr(
	nodeID roachpb.NodeID,
	addr net.Addr,
	stopper *stop.Stopper,
	t *testing.T,
	registry *metric.Registry,
) *Gossip {
	rpcContext := rpc.NewContext(log.AmbientContext{}, &base.Config{Insecure: true}, nil, stopper)
	server := rpc.NewServer(rpcContext)
	g := NewTest(nodeID, rpcContext, server, nil, stopper, registry)
	ln, err := netutil.ListenAndServeGRPC(stopper, server, addr)
	if err != nil {
		t.Fatal(err)
	}
	addr = ln.Addr()
	if err := g.SetNodeDescriptor(&roachpb.NodeDescriptor{
		NodeID:  nodeID,
		Address: util.MakeUnresolvedAddr(addr.Network(), addr.String()),
	}); err != nil {
		t.Fatal(err)
	}
	g.start(addr)
	time.Sleep(time.Millisecond)
	return g
}
Example #13
0
func (c *cluster) EnsureLeader(t *testing.T, expect net.Addr) {
	limit := time.Now().Add(400 * time.Millisecond)
CHECK:
	for _, r := range c.rafts {
		leader := r.Leader()
		if expect == nil {
			if leader != nil {
				if time.Now().After(limit) {
					t.Fatalf("leader %v expected nil", leader)
				} else {
					goto WAIT
				}
			}
		} else {
			if leader == nil || leader.String() != expect.String() {
				if time.Now().After(limit) {
					t.Fatalf("leader %v expected %v", leader, expect)
				} else {
					goto WAIT
				}
			}
		}
	}

	return
WAIT:
	time.Sleep(10 * time.Millisecond)
	goto CHECK
}
Example #14
0
func (i *InmemTransport) makeRPC(target net.Addr, args interface{}, r io.Reader, timeout time.Duration) (rpcResp RPCResponse, err error) {
	i.RLock()
	peer, ok := i.peers[target.String()]
	i.RUnlock()

	if !ok {
		err = fmt.Errorf("failed to connect to peer: %v", target)
		return
	}

	// Send the RPC over
	respCh := make(chan RPCResponse)
	peer.consumerCh <- RPC{
		Command:  args,
		Reader:   r,
		RespChan: respCh,
	}

	// Wait for a response
	select {
	case rpcResp = <-respCh:
		if rpcResp.Error != nil {
			err = rpcResp.Error
		}
	case <-time.After(timeout):
		err = fmt.Errorf("command timed out")
	}
	return
}
Example #15
0
// newNetAddress attempts to extract the IP address and port from the passed
// net.Addr interface and create a bitcoin NetAddress structure using that
// information.
func newNetAddress(addr net.Addr, services btcwire.ServiceFlag) (*btcwire.NetAddress, error) {
	// addr will be a net.TCPAddr when not using a proxy.
	if tcpAddr, ok := addr.(*net.TCPAddr); ok {
		ip := tcpAddr.IP
		port := uint16(tcpAddr.Port)
		na := btcwire.NewNetAddressIPPort(ip, port, services)
		return na, nil
	}

	// addr will be a socks.ProxiedAddr when using a proxy.
	if proxiedAddr, ok := addr.(*socks.ProxiedAddr); ok {
		ip := net.ParseIP(proxiedAddr.Host)
		if ip == nil {
			ip = net.ParseIP("0.0.0.0")
		}
		port := uint16(proxiedAddr.Port)
		na := btcwire.NewNetAddressIPPort(ip, port, services)
		return na, nil
	}

	// For the most part, addr should be one of the two above cases, but
	// to be safe, fall back to trying to parse the information from the
	// address string as a last resort.
	host, portStr, err := net.SplitHostPort(addr.String())
	if err != nil {
		return nil, err
	}
	ip := net.ParseIP(host)
	port, err := strconv.ParseUint(portStr, 10, 16)
	if err != nil {
		return nil, err
	}
	na := btcwire.NewNetAddressIPPort(ip, uint16(port), services)
	return na, nil
}
Example #16
0
// initDescriptor initializes the node descriptor with the server
// address and the node attributes.
func (n *Node) initDescriptor(addr net.Addr, attrs proto.Attributes) {
	n.Descriptor.Address = proto.Addr{
		Network: addr.Network(),
		Address: addr.String(),
	}
	n.Descriptor.Attrs = attrs
}
Example #17
0
// sendTCPUserMsg is used to send a TCP userMsg to another host
func (m *Memberlist) sendTCPUserMsg(to net.Addr, sendBuf []byte) error {
	dialer := net.Dialer{Timeout: m.config.TCPTimeout}
	conn, err := dialer.Dial("tcp", to.String())
	if err != nil {
		return err
	}
	defer conn.Close()

	bufConn := bytes.NewBuffer(nil)

	if err := bufConn.WriteByte(byte(userMsg)); err != nil {
		return err
	}

	// Send our node state
	header := userMsgHeader{UserMsgLen: len(sendBuf)}
	hd := codec.MsgpackHandle{}
	enc := codec.NewEncoder(bufConn, &hd)

	if err := enc.Encode(&header); err != nil {
		return err
	}

	if _, err := bufConn.Write(sendBuf); err != nil {
		return err
	}

	return m.rawSendMsgTCP(conn, bufConn.Bytes())
}
Example #18
0
// joinConsulServer is used to try to join another consul server
func (s *Server) joinConsulServer(m serf.Member, parts *serverParts) error {
	// Do not join ourself
	if m.Name == s.config.NodeName {
		return nil
	}

	// Check for possibility of multiple bootstrap nodes
	if parts.Bootstrap {
		members := s.serfLAN.Members()
		for _, member := range members {
			valid, p := isConsulServer(member)
			if valid && member.Name != m.Name && p.Bootstrap {
				s.logger.Printf("[ERR] consul: '%v' and '%v' are both in bootstrap mode. Only one node should be in bootstrap mode, not adding Raft peer.", m.Name, member.Name)
				return nil
			}
		}
	}

	// Attempt to add as a peer
	var addr net.Addr = &net.TCPAddr{IP: m.Addr, Port: parts.Port}
	future := s.raft.AddPeer(addr.String())
	if err := future.Error(); err != nil && err != raft.ErrKnownPeer {
		s.logger.Printf("[ERR] consul: failed to add raft peer: %v", err)
		return err
	}
	return nil
}
Example #19
0
// remoteJoin is used to handle join events on the wan serf cluster
func (s *Server) remoteJoin(me serf.MemberEvent) {
	for _, m := range me.Members {
		ok, parts := isConsulServer(m)
		if !ok {
			s.logger.Printf("[WARN] consul: non-server in WAN pool: %s %s", m.Name)
			continue
		}
		var addr net.Addr = &net.TCPAddr{IP: m.Addr, Port: parts.Port}
		s.logger.Printf("[INFO] consul: adding server for datacenter: %s, addr: %s", parts.Datacenter, addr)

		// Check if this server is known
		found := false
		s.remoteLock.Lock()
		existing := s.remoteConsuls[parts.Datacenter]
		for _, e := range existing {
			if e.String() == addr.String() {
				found = true
				break
			}
		}

		// Add ot the list if not known
		if !found {
			s.remoteConsuls[parts.Datacenter] = append(existing, addr)
		}
		s.remoteLock.Unlock()

		// Trigger the callback
		if s.config.ServerUp != nil {
			s.config.ServerUp()
		}
	}
}
Example #20
0
func (c *Client) dial(addr net.Addr) (net.Conn, error) {
	type connError struct {
		cn  net.Conn
		err error
	}
	ch := make(chan connError)
	go func() {
		nc, err := net.Dial(addr.Network(), addr.String())
		ch <- connError{nc, err}
	}()
	select {
	case ce := <-ch:
		return ce.cn, ce.err
	case <-time.After(c.netTimeout()):
		// Too slow. Fall through.
	}
	// Close the conn if it does end up finally coming in
	go func() {
		ce := <-ch
		if ce.err == nil {
			ce.cn.Close()
		}
	}()
	return nil, &ConnectTimeoutError{addr}
}
Example #21
0
// remoteFailed is used to handle fail events on the wan serf cluster
func (s *Server) remoteFailed(me serf.MemberEvent) {
	for _, m := range me.Members {
		ok, parts := isConsulServer(m)
		if !ok {
			continue
		}
		var addr net.Addr = &net.TCPAddr{IP: m.Addr, Port: parts.Port}
		s.logger.Printf("[INFO] consul: removing server for datacenter: %s, addr: %s", parts.Datacenter, addr)

		// Remove the server if known
		s.remoteLock.Lock()
		existing := s.remoteConsuls[parts.Datacenter]
		n := len(existing)
		for i := 0; i < n; i++ {
			if existing[i].String() == addr.String() {
				existing[i], existing[n-1] = existing[n-1], nil
				existing = existing[:n-1]
				n--
				break
			}
		}

		// Trim the list if all known consuls are dead
		if n == 0 {
			delete(s.remoteConsuls, parts.Datacenter)
		} else {
			s.remoteConsuls[parts.Datacenter] = existing
		}
		s.remoteLock.Unlock()
	}
}
Example #22
0
func (a *Agent) Propagate(dest net.Addr, id string, addr net.Addr) {
	a.wlock.Lock()
	defer a.wlock.Unlock()
	fmt.Fprintf(&a.wbur, wpropagate, id, addr.String())
	a.Socket.WriteTo(a.wbur.Bytes(), dest)
	a.wbur.Truncate(0)
}
Example #23
0
// Determine ssl server names from a net.Addr
func GetTargetServernames(addr net.Addr) (hosts []string, err error) {
	c, err := tls.Dial("tcp4", addr.String(), &tls.Config{RootCAs: trust_db})
	if err != nil {
		if err, ok := err.(x509.HostnameError); ok {
			// This is a tls error condition our side because we asked for an
			// IP connection (we don't know the hostname of the target, only
			// the IP).

			// It's okay because we're just interested in finding out what hosts
			// we should tell the client we are. If it is invalid, the client
			// will bail out.

			hosts := err.Certificate.DNSNames
			if len(hosts) == 0 {
				hosts = []string{err.Certificate.Subject.CommonName} //err.Host}
			}
			return hosts, nil
		}
		return
	}
	err = c.Handshake()
	if err != nil {
		return
	}
	hosts = c.ConnectionState().PeerCertificates[0].DNSNames
	return
}
Example #24
0
// listen and run
func ListenAndServe(addr string) error {
	var netaddr net.Addr
	var err error
	if strings.Contains(addr, "/") {
		netaddr, err = net.ResolveUnixAddr("unix", addr)
		if err != nil {
			return err
		}
	} else {
		netaddr, err = net.ResolveTCPAddr("tcp", addr)
		if err != nil {
			return err
		}
	}
	// listen
	l, err := net.Listen(netaddr.Network(), netaddr.String())
	if err != nil {
		return err
	}
	// same with ServeRpc
	http.Handle(GetRpcPath(codecName), &rpcHandler{NewServerCodec})

	err = http.Serve(l, nil)
	return err
}
Example #25
0
// Dial connects to the address addr and returns a Message-oriented connection.
func Dial(addr net.Addr) (*Conn, error) {
	conn, err := net.Dial(addr.Network(), addr.String())
	if err != nil {
		return nil, err
	}
	return WrapConn(conn), nil
}
Example #26
0
// closeClient closes an existing client specified by client's
// remote address.
func (g *Gossip) closeClient(addr net.Addr) {
	g.clientsMu.Lock()
	c := g.clients[addr.String()]
	c.close()
	delete(g.clients, addr.String())
	g.clientsMu.Unlock()
}
func sshPermissionsFromProcess(
	processGuid string,
	index int,
	receptorClient receptor.Client,
	remoteAddr net.Addr,
) (*ssh.Permissions, error) {
	actual, err := receptorClient.ActualLRPByProcessGuidAndIndex(processGuid, index)
	if err != nil {
		return nil, err
	}

	desired, err := receptorClient.GetDesiredLRP(processGuid)
	if err != nil {
		return nil, err
	}

	sshRoute, err := getRoutingInfo(&desired)
	if err != nil {
		return nil, err
	}

	logMessage := fmt.Sprintf("Successful remote access by %s", remoteAddr.String())

	return createPermissions(sshRoute, &actual, desired.LogGuid, logMessage, index)
}
Example #28
0
// This function is expected to be called as a goroutine.
// TODO: Track and log bytes copied, like TCP
func (udp *udpProxySocket) proxyClient(cliAddr net.Addr, svrConn net.Conn, activeClients *clientCache, timeout time.Duration) {
	defer svrConn.Close()
	var buffer [4096]byte
	for {
		n, err := svrConn.Read(buffer[0:])
		if err != nil {
			if !logTimeout(err) {
				glog.Errorf("Read failed: %v", err)
			}
			break
		}
		svrConn.SetDeadline(time.Now().Add(timeout))
		if err != nil {
			glog.Errorf("SetDeadline failed: %v", err)
			break
		}
		n, err = udp.WriteTo(buffer[0:n], cliAddr)
		if err != nil {
			if !logTimeout(err) {
				glog.Errorf("WriteTo failed: %v", err)
			}
			break
		}
	}
	activeClients.mu.Lock()
	delete(activeClients.clients, cliAddr.String())
	activeClients.mu.Unlock()
}
Example #29
0
func (udp *udpProxySocket) getBackendConn(activeClients *clientCache, cliAddr net.Addr, proxier *Proxier, service string, timeout time.Duration) (net.Conn, error) {
	activeClients.mu.Lock()
	defer activeClients.mu.Unlock()

	svrConn, found := activeClients.clients[cliAddr.String()]
	if !found {
		// TODO: This could spin up a new goroutine to make the outbound connection,
		// and keep accepting inbound traffic.
		glog.V(2).Infof("New UDP connection from %s", cliAddr)
		endpoint, err := proxier.loadBalancer.NextEndpoint(service, cliAddr)
		if err != nil {
			glog.Errorf("Couldn't find an endpoint for %s %v", service, err)
			return nil, err
		}
		glog.V(3).Infof("Mapped service %q to endpoint %s", service, endpoint)
		svrConn, err = net.DialTimeout("udp", endpoint, endpointDialTimeout)
		if err != nil {
			// TODO: Try another endpoint?
			glog.Errorf("Dial failed: %v", err)
			return nil, err
		}
		activeClients.clients[cliAddr.String()] = svrConn
		go func(cliAddr net.Addr, svrConn net.Conn, activeClients *clientCache, timeout time.Duration) {
			defer util.HandleCrash()
			udp.proxyClient(cliAddr, svrConn, activeClients, timeout)
		}(cliAddr, svrConn, activeClients, timeout)
	}
	return svrConn, nil
}
Example #30
-1
func udpListener(conn *net.UDPConn, sendingFrom net.Addr, start *sync.WaitGroup, end *sync.WaitGroup) {
	fmt.Fprintln(os.Stderr, "Started listener...")
	start.Done()

	buff := make([]byte, 1600) // standard MTU size -- no packet should be bigger
	for i := 0; true; i++ {
		fmt.Fprintln(os.Stderr, "Waiting for packet #"+strconv.Itoa(i))
		len, from, err := conn.ReadFromUDP(buff)
		if err != nil {
			fmt.Fprintln(os.Stderr, "Error receiving UDP packet: "+err.Error())
		}
		if from.String() == sendingFrom.String() {
			i--
			continue
		}

		str := string(buff[:len])
		fmt.Println("Received message from " + from.String() + "\n\t" + str)
		if strings.Contains(str, "<<terminate>>") {
			conn.Close()
			fmt.Fprintln(os.Stderr, "Terminated UDP listener")
			end.Done()
			return
		}
	}
}