Exemple #1
1
// NewClient returns a new Client instance connected to an IMAP server via conn.
// The function waits for the server to send a greeting message, and then
// requests server capabilities if they weren't included in the greeting. An
// error is returned if either operation fails or does not complete before the
// timeout, which must be positive to have any effect. If an error is returned,
// it is the caller's responsibility to close the connection.
func NewClient(conn net.Conn, host string, timeout time.Duration) (c *Client, err error) {
	log := newDebugLog(DefaultLogger, DefaultLogMask)
	cch := make(chan chan<- *response, 1)

	c = &Client{
		Caps:          make(map[string]bool),
		CommandConfig: defaultCommands(),
		host:          host,
		state:         unknown,
		tag:           *newTagGen(0),
		cmds:          make(map[string]*Command),
		t:             newTransport(conn, log),
		debugLog:      log,
	}
	c.r = newReader(c.t, MemoryReader{}, string(c.tag.id))
	c.Logf(LogConn, "Connected to %v (Tag=%s)", conn.RemoteAddr(), c.tag.id)

	if err = c.greeting(timeout); err != nil {
		c.Logln(LogConn, "Greeting error:", err)
		return nil, err
	}
	c.cch = cch
	go c.receiver(cch)
	runtime.Gosched()
	return
}
Exemple #2
1
// handleRawConn is run in its own goroutine and handles a just-accepted
// connection that has not had any I/O performed on it yet.
func (s *Server) handleRawConn(rawConn net.Conn) {
	conn, authInfo, err := s.useTransportAuthenticator(rawConn)
	if err != nil {
		s.mu.Lock()
		s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
		s.mu.Unlock()
		grpclog.Printf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
		rawConn.Close()
		return
	}

	s.mu.Lock()
	if s.conns == nil {
		s.mu.Unlock()
		conn.Close()
		return
	}
	s.mu.Unlock()

	if s.opts.useHandlerImpl {
		s.serveUsingHandler(conn)
	} else {
		s.serveNewHTTP2Transport(conn, authInfo)
	}
}
Exemple #3
1
func (s *Server) onConn(c net.Conn) {
	conn := s.newClientConn(c) //新建一个conn

	defer func() {
		err := recover()
		if err != nil {
			const size = 4096
			buf := make([]byte, size)
			buf = buf[:runtime.Stack(buf, false)] //获得当前goroutine的stacktrace
			golog.Error("server", "onConn", "error", 0,
				"remoteAddr", c.RemoteAddr().String(),
				"stack", string(buf),
			)
		}

		conn.Close()
	}()

	if allowConnect := conn.IsAllowConnect(); allowConnect == false {
		err := mysql.NewError(mysql.ER_ACCESS_DENIED_ERROR, "ip address access denied by kingshard.")
		conn.writeError(err)
		conn.Close()
		return
	}
	if err := conn.Handshake(); err != nil {
		golog.Error("server", "onConn", err.Error(), 0)
		c.Close()
		return
	}

	conn.Run()
}
Exemple #4
1
func (p *Peer) Accept(conn net.Conn) (_err error) {
	defer conn.Close()

	p.logFields(SERVE, log.Fields{
		"remoteAddr": conn.RemoteAddr(),
	}).Debug("accepted connection")
	defer func() {
		if _err != nil {
			p.logErr(SERVE, _err).Error()
		}
	}()

	var failResp string
	if p.readAcquire() {
		defer p.wg.Done()
	} else {
		failResp = "sync not available, currently mutating"
	}

	remoteConfig, err := p.handleConfig(conn, SERVE, failResp)
	if err != nil {
		return errgo.Mask(err)
	}

	if failResp == "" {
		return p.interactWithClient(conn, remoteConfig, cf.NewBitstring(0))
	}
	return nil
}
Exemple #5
0
// The core of the file: read any input from the connection and outputs it into
// the server connection
func proxyConnection(conn net.Conn, done chan bool) {
	dec := json.NewDecoder(conn)
	nerr := 0
	for {
		m := SingleMeasure{}
		// Receive data
		if err := dec.Decode(&m); err != nil {
			if err == io.EOF {
				break
			}
			log.Lvl1("Error receiving data from", conn.RemoteAddr().String(), ":", err)
			nerr++
			if nerr > 1 {
				log.Lvl1("Too many errors from", conn.RemoteAddr().String(), ": Abort connection")
				break
			}
		}
		log.Lvl3("Proxy received", m)

		// Proxy data back to monitor
		if err := serverEnc.Encode(m); err != nil {
			log.Lvl2("Error proxying data :", err)
			break
		}
		if m.Name == "end" {
			// the end
			log.Lvl2("Proxy detected end of measurement. Closing connection.")
			break
		}
	}
	if err := conn.Close(); err != nil {
		log.Error("Couldn't close connection:", err)
	}
	done <- true
}
Exemple #6
0
func handleClient(conn net.Conn) {
	common.Conn2ClientInfo[conn] = &common.ClientInfo{Conn: conn, ClientMap: make(map[net.Conn]*common.Session), Id2Session: make(map[string]*common.Session), IsServer: false, Quit: make(chan bool), ResponseTime: time.Now().Unix()}
	log.Println("client linked success", conn.RemoteAddr().String())
	common.Conn2ClientInfo[conn].Loop()
	common.Read(conn, handleResponse)
	client, bHave := common.Conn2ClientInfo[conn]
	if bHave {
		close(client.Quit)
		if client.IsServer {
			for conn, session := range client.ClientMap {
				conn.Close()
				common.RmId(client.ServerName, session.Id)
			}
			delete(common.ServerName2Conn, client.ServerName)
			log.Println("unregister service Name", client.ServerName)
			if bUseDB {
				user, _ := auth.GetUser(client.UserName)
				if user != nil {
					user.OnLogout()
				}
			}
		} else {
			common.GetServerInfoByConn(conn, func(server *common.ClientInfo) {
				id := server.DelClient(conn)
				log.Println("send quit")
				common.Write(server.Conn, id, "clientquit", "")
			}, func() {})
		}
		delete(common.Conn2ClientInfo, conn)
	}
	conn.Close()
	log.Println("client disconnected", conn.RemoteAddr().String())
}
Exemple #7
0
func handleConn(conn net.Conn) {
	defer conn.Close()
	log.Println("connected from:", conn.RemoteAddr())
	dst, err := dialer.Dial("tcp", *dstAddr)
	if err != nil {
		log.Println(err)
		return
	}
	defer dst.Close()
	wg := &sync.WaitGroup{}
	wg.Add(2)
	go func(wg *sync.WaitGroup) {
		buf := bufferPool.Get()
		_, err = io.CopyBuffer(conn, dst, buf.([]byte))
		if err != nil {
			log.Println(err)
		}
		bufferPool.Put(buf)
		wg.Done()
	}(wg)
	go func(wg *sync.WaitGroup) {
		buf := bufferPool.Get()
		_, err = io.CopyBuffer(dst, conn, buf.([]byte))
		if err != nil {
			log.Println(err)
		}
		bufferPool.Put(buf)
		wg.Done()
	}(wg)
	wg.Wait()
}
Exemple #8
0
func storage_upload_file(header *Header, conn net.Conn) bool {
	buff := make([]byte, header.pkg_len)
	n, err := io.ReadFull(conn, buff)
	if err != nil || n != int(header.pkg_len) {
		return false
	}
	req := &UploadFileRequest{}
	err = req.Unmarshal(buff)
	if err != nil {
		return false
	}

	file_ext := storage_format_ext_name(req.file_ext)
	crc32 := crc32.ChecksumIEEE(req.file_data)
	now := time.Now()
	//	log.Println(req.store_path_index, req.file_length,  len(req.file_data), file_ext, crc32)

	addr, _ := conn.RemoteAddr().(*net.TCPAddr)
	file_name, full_name := storage_get_filename(addr.IP.String(), int(req.store_path_index), int(now.Unix()), req.file_length, int(crc32), file_ext)
	file, err := os.OpenFile(full_name, os.O_WRONLY|os.O_EXCL|os.O_CREATE, 0644)
	if err != nil {
		log.Print(err)
		return send_result(errno(err), conn)
	}
	n, err = file.Write(req.file_data)
	if err != nil || n != len(req.file_data) {
		panic("write")
	}

	file_name = fmt.Sprintf("M00/%s", file_name)
	storage_binlog_write(int(now.Unix()), STORAGE_OP_TYPE_SOURCE_CREATE_FILE, file_name)

	resp := &UploadFileResponse{"group1", file_name}
	return send_response(resp, conn)
}
Exemple #9
0
func handleResponse(conn net.Conn, request *protocol.VMessRequest, output chan<- *alloc.Buffer, finish *sync.Mutex, isUDP bool) {
	defer finish.Unlock()
	defer close(output)
	responseKey := md5.Sum(request.RequestKey[:])
	responseIV := md5.Sum(request.RequestIV[:])

	decryptResponseReader, err := v2io.NewAesDecryptReader(responseKey[:], responseIV[:], conn)
	if err != nil {
		log.Error("VMessOut: Failed to create decrypt reader: %v", err)
		return
	}

	buffer, err := v2net.ReadFrom(decryptResponseReader, nil)
	if err != nil {
		log.Error("VMessOut: Failed to read VMess response (%d bytes): %v", buffer.Len(), err)
		return
	}
	if buffer.Len() < 4 || !bytes.Equal(buffer.Value[:4], request.ResponseHeader[:]) {
		log.Warning("VMessOut: unexepcted response header. The connection is probably hijacked.")
		return
	}
	log.Info("VMessOut received %d bytes from %s", buffer.Len()-4, conn.RemoteAddr().String())

	buffer.SliceFrom(4)
	output <- buffer

	if !isUDP {
		v2net.ReaderToChan(output, decryptResponseReader)
	}

	return
}
// hanleTCPConn handle a long live tcp connection.
func handleTCPConn(conn net.Conn, rc chan *bufio.Reader) {
	addr := conn.RemoteAddr().String()
	log.Debug("<%s> handleTcpConn routine start", addr)
	rd := newBufioReader(rc, conn)
	if args, err := parseCmd(rd); err == nil {
		// return buffer bufio.Reader
		putBufioReader(rc, rd)
		switch args[0] {
		case "sub":
			SubscribeTCPHandle(conn, args[1:])
			break
		default:
			conn.Write(ParamReply)
			log.Warn("<%s> unknown cmd \"%s\"", addr, args[0])
			break
		}
	} else {
		// return buffer bufio.Reader
		putBufioReader(rc, rd)
		log.Error("<%s> parseCmd() error(%v)", addr, err)
	}
	// close the connection
	if err := conn.Close(); err != nil {
		log.Error("<%s> conn.Close() error(%v)", addr, err)
	}
	log.Debug("<%s> handleTcpConn routine stop", addr)
	return
}
Exemple #11
0
func tunnel(conn net.Conn) {
	defer conn.Close()

	// We start with a JSON header, currenly only has the dest addr.
	hdrdec := json.NewDecoder(conn)
	var hdr header
	err := hdrdec.Decode(&hdr)
	if err != nil {
		log.Printf("Couldn't parse tunnelled connection header: %v", err)
		return
	}

	destc, err := net.Dial("tcp", hdr.Destaddr)
	if err != nil {
		log.Printf("Couldn't dial destination $v: %v", hdr.Destaddr, err)
		return
	}
	defer destc.Close()

	log.Printf("Now tunnelling %v to %v", conn.RemoteAddr(), destc.RemoteAddr())
	done := make(chan struct{})
	go func() {
		io.Copy(destc, io.MultiReader(hdrdec.Buffered(), conn))
		done <- struct{}{}
	}()
	io.Copy(conn, destc)
	<-done
}
Exemple #12
0
func handleConn(cid int, usConn net.Conn) {
	defer usConn.Close()

	log.Println(cid, "Handling new connection from", usConn.RemoteAddr())
	log.Println(cid, "Making downstream connection...")
	dsConn, err := makeDownstreamConnection()
	defer dsConn.Close()
	if err != nil {
		log.Println(cid, "Failed upstream", err)
		return
	}

	hp, err := ReadHandshakePacket(usConn)
	if err != nil {
		log.Println(cid, "Failed RHP", err)
		return
	}

	hp2 := MangleHandshakePacket(hp)

	err = WriteHandshakePacket(dsConn, hp2)
	if err != nil {
		log.Println(cid, "Failed WHP", err)
		return
	}

	go io.Copy(usConn, dsConn)
	io.Copy(dsConn, usConn)
}
Exemple #13
0
func roundtrip(ctx *ClientContext, conn net.Conn, requestSize, requestBytes []byte) ([]byte, error) {
	deadline, ok := ctx.Deadline()
	if !ok {
		deadline = time.Time{}
	}

	var err error
	if err = conn.SetDeadline(deadline); err != nil {
		return nil, makeClientErr(err.Error())
	}
	if _, err = conn.Write(requestSize); err != nil {
		return nil, makeClientErrf("Failed to write 4 bytes for request size: %s", err)
	}
	if _, err = conn.Write(requestBytes); err != nil {
		return nil, makeClientErrf("Failed to write %d bytes for request: %s", err)
	}
	buf := bytes.NewBuffer(make([]byte, 0, 4))
	if _, err = io.CopyN(buf, conn, 4); err != nil {
		return nil, makeClientErrf(
			"Failed to read 4 bytes for response size from '%s': %s",
			conn.RemoteAddr().String(), err)
	}
	responseSize := binary.BigEndian.Uint32(buf.Bytes())
	if _, err = io.CopyN(buf, conn, int64(responseSize)); err != nil {
		return nil, makeClientErrf(
			"Failed to read %d bytes for response from '%s': %s",
			conn.RemoteAddr().String(), err)
	}
	return buf.Bytes(), nil
}
Exemple #14
0
func newClientRESP(conn net.Conn, app *App) {
	c := new(respClient)

	c.client = newClient(app)
	c.conn = conn

	c.activeQuit = false

	if tcpConn, ok := conn.(*net.TCPConn); ok {
		tcpConn.SetReadBuffer(app.cfg.ConnReadBufferSize)
		tcpConn.SetWriteBuffer(app.cfg.ConnWriteBufferSize)
	}

	br := bufio.NewReaderSize(conn, app.cfg.ConnReadBufferSize)
	c.respReader = goredis.NewRespReader(br)

	c.resp = newWriterRESP(conn, app.cfg.ConnWriteBufferSize)
	c.remoteAddr = conn.RemoteAddr().String()

	app.connWait.Add(1)

	app.addRespClient(c)

	go c.run()
}
Exemple #15
0
func (s *Server) onConn(c net.Conn) {
	conn := s.newClientConn(c)

	defer func() {
		err := recover()
		if err != nil {
			const size = 4096
			buf := make([]byte, size)
			buf = buf[:runtime.Stack(buf, false)]
			log.Printf("Error server.onConn remoteAddr:%s, stack:%s", c.RemoteAddr().String(), string(buf))
		}

		conn.Close()
	}()

	if allowConnect := conn.IsAllowConnect(); allowConnect == false {
		err := mysql.NewError(mysql.ER_ACCESS_DENIED_ERROR, "ip address access denied by mysqlproxy.")
		conn.writeError(err)
		conn.Close()
		return
	}
	if err := conn.Handshake(); err != nil {
		log.Printf("Error server.onConn  %s", err.Error())
		c.Close()
		return
	}

	conn.Run()
}
Exemple #16
0
////////////////////////////////////////////////////////
//
//服务器端接收数据线程
//参数:
//		数据连接 conn
////////////////////////////////////////////////////////
func Handler(conn net.Conn) {
	//获取访问者IP端口
	siteno := "0"
	ipstr := conn.RemoteAddr().String()
	fmt.Println("connected from", ipstr)
	buf := make([]byte, 1024)
	for {
		lenght, err := conn.Read(buf)
		if checkError(err, "Readerr: Close"+ipstr) == false {
			conn.Close()
			delete(conns, ipstr)
			delete(sitetelnoreply, siteiptotel[ipstr])
			delete(siteiptotel, ipstr)
			break
		}
		if lenght > 0 {
			buf[lenght] = 0
		}
		if siteno == "0" && lenght > 20 {
			siteno = string(buf[4:15])
			siteiptotel[ipstr] = siteno
		}
		//fmt.Println("Rec[", ipstr, "] Say :", string(buf[0:lenght]))
		reciveStr := string(buf[0:lenght])
		if lenght > 20 && crcok(buf) {
			//用于记录 站点有多少次 没有回复指令累计10次就断开链接
			sitetelnoreply[siteno] = 0

			setFiles(reciveStr, siteno)
			//这个站点累计0次没有回复
		}
	}
}
Exemple #17
0
func handleClient(conn net.Conn, hello, goodbye chan<- client, toBroadcast chan<- string) {
	// Lifecycle management.
	toClient := make(chan string)
	hello <- toClient
	defer func() { goodbye <- toClient }()

	// Announce the presence of a new chatter.
	handle := conn.RemoteAddr().String()
	toBroadcast <- fmt.Sprintf("%s has joined the chat", handle)
	defer func() { toBroadcast <- fmt.Sprintf("%s has left the chat", handle) }()

	// Messages from the chat server to the conn.
	// We range over the toClient channel and exit when it's closed.
	// (It's closed after it's processed by the goodbye handler.)
	go func() {
		for message := range toClient {
			fmt.Fprintf(conn, message+"\n")
		}
	}()

	// Messages from the conn to the chat server.
	// When the client disconnects, the scanner stops scanning.
	// We close the conn, and signal our goodbye via the defer.
	s := bufio.NewScanner(conn)
	for s.Scan() {
		toBroadcast <- "<" + handle + "> " + s.Text()
	}
}
Exemple #18
0
func handleConnection(local net.Conn) error {
	defer local.Close()

	handlerChan <- 1
	defer func() {
		handlerChan <- -1
	}()

	var remote net.Conn
	err := socks.AwaitSocks4aConnect(local.(*net.TCPConn), func(dest string) (*net.TCPAddr, error) {
		var err error
		// set remote in outer function environment
		remote, err = net.Dial("tcp", dest)
		if err != nil {
			return nil, err
		}
		return remote.RemoteAddr().(*net.TCPAddr), nil
	})
	if err != nil {
		return err
	}
	defer remote.Close()
	copyLoop(local, remote)

	return nil
}
Exemple #19
0
func (s *Server) handleConnection(conn net.Conn) {
	defer func() {
		conn.Close()
		s.Logger.Printf("connection from %s closed", conn.RemoteAddr())
	}()
	s.Logger.Printf("new connection from %s", conn.RemoteAddr())

	reader := bufio.NewReader(conn)

	for {
		b, err := reader.ReadString('\n')
		if err != nil {
			conn.Close()
			return
		} else {
			query := strings.Trim(b, "\r\n")
			if query == "" {
				continue
			}

			s.Logger.Printf("executing query '%s'", query)
			c, err := s.searcher.Search(query)
			if err != nil {
				conn.Write([]byte(err.Error()))
			} else {
				for s := range c {
					conn.Write([]byte(s + "\n"))
				}
			}
			// Send two newlines to indicate end-of-results.
			conn.Write([]byte("\n\n"))
		}
	}
}
Exemple #20
0
func (p *Proxy) handleLoop(conn net.Conn) {
	p.conns.Add(1)
	defer p.conns.Done()
	defer conn.Close()

	s, err := newSession()
	if err != nil {
		log.Errorf("martian: failed to create session: %v", err)
		return
	}

	ctx, err := withSession(s)
	if err != nil {
		log.Errorf("martian: failed to create context: %v", err)
		return
	}

	brw := bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))

	for {
		deadline := time.Now().Add(p.timeout)
		conn.SetDeadline(deadline)

		if err := p.handle(ctx, conn, brw); isCloseable(err) {
			log.Debugf("martian: closing connection: %v", conn.RemoteAddr())
			return
		}
	}
}
Exemple #21
0
func HandleIncomingSSHConn(nConn net.Conn, config *ssh.ServerConfig) {
	DoneCh := make(chan bool)
	go TimeoutConnection(DoneCh, nConn)
	_, chans, reqs, err := ssh.NewServerConn(nConn, config)
	if err == nil {
		DoneCh <- true
	}
	// Right now that we are out of annoying people land.

	defer nConn.Close()
	go HandleSSHrequests(reqs)

	for newChannel := range chans {
		if newChannel.ChannelType() != "session" {
			newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
			log.Printf("WARNING - Rejecting %s Because they asked for a chan type %s that I don't have", nConn.RemoteAddr().String(), newChannel.ChannelType())
			continue
		}

		channel, requests, err := newChannel.Accept()
		if err != nil {
			log.Printf("WARNING - Was unable to Accept channel with %s", nConn.RemoteAddr().String())
			return
		}
		go HandleSSHrequests(requests)
		go ServeDOSTerm(channel)
	}

}
Exemple #22
0
// newClientConn wraps the provided connections and enables secured
// duplex communication between the client and the server.
func newClientConn(conn net.Conn) (*clientConn, error) {
	pub, priv, err := box.GenerateKey(rand.Reader)
	if err != nil {
		return nil, err
	}

	privK, pubK := (*key)(priv), (*key)(pub)

	v(2).Printf("client: generated private key %v, public key %v", privK, pubK)

	peersPub, err := exchange(conn, pubK)
	if err != nil {
		return nil, fmt.Errorf("key exchange failed with server %v: %v", conn.RemoteAddr(), err)
	}

	v(2).Printf("client: peer's public key is %v", peersPub)

	cc := &clientConn{
		NewSecureReader(conn, privK, peersPub),
		NewSecureWriter(conn, privK, peersPub),
		conn,
	}

	return cc, nil
}
Exemple #23
0
func (f *forwarder) connect() {
	if f.c != nil {
		return
	}

	rate := time.Tick(200 * time.Millisecond)
	for {
		var c net.Conn
		var err error

		if f.Config.TlsConfig != nil {
			c, err = tls.Dial("tcp", f.Config.ForwardDest, f.Config.TlsConfig)
		} else {
			c, err = net.DialTimeout("tcp", f.Config.ForwardDest, f.Config.ForwardDestConnectTimeout)
		}

		if err != nil {
			f.cErrors.Inc(1)
			log.WithFields(log.Fields{"id": f.ID, "message": err}).Error("Forwarder Connection Error")
			f.disconnect()
		} else {
			f.cSuccesses.Inc(1)
			log.WithFields(log.Fields{"id": f.ID, "remote_addr": c.RemoteAddr().String()}).Info("Forwarder Connection Success")
			f.c = c
			return
		}
		<-rate
	}
}
Exemple #24
0
func serverHandler(f base.ServerFactory, conn net.Conn, info *pt.ServerInfo) {
	defer conn.Close()
	termMon.onHandlerStart()
	defer termMon.onHandlerFinish()

	name := f.Transport().Name()
	addrStr := log.ElideAddr(conn.RemoteAddr().String())
	log.Infof("%s(%s) - new connection", name, addrStr)

	// Instantiate the server transport method and handshake.
	remote, err := f.WrapConn(conn)
	if err != nil {
		log.Warnf("%s(%s) - handshake failed: %s", name, addrStr, log.ElideError(err))
		return
	}

	// Connect to the orport.
	orConn, err := pt.DialOr(info, conn.RemoteAddr().String(), name)
	if err != nil {
		log.Errorf("%s(%s) - failed to connect to ORPort: %s", name, addrStr, log.ElideError(err))
		return
	}
	defer orConn.Close()

	if err = copyLoop(orConn, remote); err != nil {
		log.Warnf("%s(%s) - closed connection: %s", name, addrStr, log.ElideError(err))
	} else {
		log.Infof("%s(%s) - closed connection", name, addrStr)
	}

	return
}
Exemple #25
0
func NewClientV2(conn net.Conn) *ClientV2 {
	var identifier string
	if conn != nil {
		identifier, _, _ = net.SplitHostPort(conn.RemoteAddr().String())
	}

	return &ClientV2{
		Conn: conn,
		// ReadyStateChan has a buffer of 1 to guarantee that in the event
		// there is a race the state update is not lost
		ReadyStateChan:  make(chan int, 1),
		ExitChan:        make(chan int),
		ConnectTime:     time.Now(),
		ShortIdentifier: identifier,
		LongIdentifier:  identifier,
		Reader:          bufio.NewReaderSize(conn, 16*1024),
		Writer:          bufio.NewWriterSize(conn, 16*1024),
		State:           nsq.StateInit,
		SubEventChan:    make(chan *Channel, 1),

		// heartbeats are client configurable but default to 30s
		HeartbeatInterval:   nsqd.options.clientTimeout / 2,
		HeartbeatUpdateChan: make(chan time.Duration, 1),
	}
}
Exemple #26
0
// handle a new connection:
// Steps:
//	1. Read input from connection line by line.
//	2. Parse each line into a metric.
//	3. Validate the metric
//	4. Process the metric.
func (d *Detector) handle(conn net.Conn) {
	addr := conn.RemoteAddr()
	health.IncrNumClients(1)
	defer health.DecrNumClients(1)
	log.Infof("conn %s established", addr)
	scanner := bufio.NewScanner(conn)
	for scanner.Scan() { // Read line by line.
		if err := scanner.Err(); err != nil { // Close on read error.
			log.Errorf("read error: %v, closing conn..", err)
			break
		}
		line := scanner.Text()
		m, err := parseMetric(line) // Parse
		if err != nil {
			log.Errorf("parse error: %v, skipping..", err)
			continue
		}
		if err = m.Validate(); err != nil {
			log.Errorf("invalid metric: %v, skipping..", err)
			return
		}
		d.process(m, true)
	}
	conn.Close()
	log.Infof("conn %s disconnected", addr)
}
Exemple #27
0
func (sup *Supervisor) acceptAgent(cc net.Conn) {
	sup.mu.Lock()
	defer sup.mu.Unlock()

	raddr := addressFromNet(cc.RemoteAddr())
	ll := log.KV("raddr", raddr)

	if _, ok := sup.agents[raddr]; ok {
		ll.Info("agent already joined")
		_ = cc.Close()
		return
	}
	ll.Info("new agent joined")

	agent := &agent{
		ll:       ll,
		addr:     raddr,
		client:   rpc.RepresentAgent(cc, sup.provider),
		cc:       cc,
		setState: make(chan stack),
	}
	sup.agents[raddr] = agent

	if s, ok := sup.dfn.Machines[raddr]; !ok {
		ll.Info("no stack defined for this agent")
	} else {
		go agent.enforceState(s)
	}
}
Exemple #28
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// handleRawConn is run in its own goroutine and handles a just-accepted
// connection that has not had any I/O performed on it yet.
func (s *Server) handleRawConn(rawConn net.Conn) {
	// Server在每一个Connection上都都做啥了
	// 1. 获取经过 TLS 封装的 Conn/AuthInfo等
	conn, authInfo, err := s.useTransportAuthenticator(rawConn)

	// HandShake Failed
	if err != nil {
		s.mu.Lock()
		s.errorf("ServerHandshake(%q) failed: %v", rawConn.RemoteAddr(), err)
		s.mu.Unlock()
		grpclog.Printf("grpc: Server.Serve failed to complete security handshake from %q: %v", rawConn.RemoteAddr(), err)
		rawConn.Close()
		return
	}

	// 服务关闭
	s.mu.Lock()
	if s.conns == nil {
		s.mu.Unlock()
		conn.Close()
		return
	}
	s.mu.Unlock()

	// 2. 对外提供服务
	if s.opts.useHandlerImpl {
		s.serveUsingHandler(conn)
	} else {
		s.serveNewHTTP2Transport(conn, authInfo)
	}
}
func (self *ProtobufServer) handleConnection(conn net.Conn) {
	log.Info("ProtobufServer: client connected: %s", conn.RemoteAddr().String())

	message := make([]byte, 0, MAX_REQUEST_SIZE)
	buff := bytes.NewBuffer(message)
	var messageSizeU uint32
	for {
		err := binary.Read(conn, binary.LittleEndian, &messageSizeU)
		if err != nil {
			log.Error("Error reading from connection (%s): %s", conn.RemoteAddr().String(), err)
			self.connectionMapLock.Lock()
			delete(self.connectionMap, conn)
			self.connectionMapLock.Unlock()
			conn.Close()
			return
		}

		messageSize := int64(messageSizeU)
		if messageSize > MAX_REQUEST_SIZE {
			err = self.handleRequestTooLarge(conn, messageSize, buff)
		} else {
			err = self.handleRequest(conn, messageSize, buff)
		}

		if err != nil {
			log.Error("Error, closing connection: %s", err)
			self.connectionMapLock.Lock()
			delete(self.connectionMap, conn)
			self.connectionMapLock.Unlock()
			conn.Close()
			return
		}
		buff.Reset()
	}
}
Exemple #30
0
// ServeConn takes an inbound conn and proxies it to a backend.
func (p *ReverseProxy) ServeConn(ctx context.Context, dconn net.Conn) {
	transport := p.transport
	if transport == nil {
		panic("router: nil transport for proxy")
	}
	defer dconn.Close()

	clientGone := dconn.(http.CloseNotifier).CloseNotify()
	ctx, cancel := context.WithCancel(ctx)
	defer cancel() // finish cancellation goroutine

	go func() {
		select {
		case <-clientGone:
			cancel() // client went away, cancel request
		case <-ctx.Done():
		}
	}()

	l := p.Logger.New("client_addr", dconn.RemoteAddr(), "host_addr", dconn.LocalAddr(), "proxy", "tcp")

	uconn, err := transport.Connect(ctx, l)
	if err != nil {
		return
	}
	defer uconn.Close()

	joinConns(uconn, dconn)
}