func newConn(sock *net.UDPConn, local, remote net.Addr, id int) *Conn {
sock.SetDeadline(time.Time{})
conn := &Conn{conn: sock, local: local, remote: remote, closed: false, quit: make(chan bool), tmp: make([]byte, CacheBuffSize*2), tmp2: make([]byte, CacheBuffSize), sendChan: make(chan string, 10), checkCanWrite: make(chan chan bool), readChan: make(chan cache), overTime: time.Now().Unix() + 30, fecWriteId: 0, fecSendC: 0}
debug("create", id)
conn.kcp = ikcp.Ikcp_create(uint32(id), conn)
conn.kcp.Output = udp_output
conn.SetKcp(DefaultKcpSetting())
if *bCompress {
conn.compressCache = make([]byte, CacheBuffSize*2)
conn.compressSendChan = make(chan []byte, 100)
go func() {
for {
select {
case b := <-conn.compressSendChan:
enc, er := zappy.Encode(conn.compressCache, b)
if er != nil {
log.Println("compress error", er.Error())
go conn.Close()
break
}
//log.Println("compress", len(b), len(enc))
conn.conn.WriteTo(enc, conn.remote)
case <-conn.quit:
return
}
}
}()
}
return conn
}
func newConn(sock *net.UDPConn, local, remote net.Addr, id int) *Conn {
sock.SetDeadline(time.Time{})
conn := &Conn{conn: sock, local: local, remote: remote, closed: false, quit: make(chan bool), tmp: make([]byte, 2000), tmp2: make([]byte, 2000), sendChan: make(chan string, 10), checkCanWrite: make(chan chan bool), readChan: make(chan cache)}
debug("create", id)
conn.kcp = ikcp.Ikcp_create(uint32(id), conn)
conn.kcp.Output = udp_output
ikcp.Ikcp_wndsize(conn.kcp, 128, 128)
ikcp.Ikcp_nodelay(conn.kcp, 1, 10, 2, 1)
return conn
}
// readInputUdp parses the buffer for UDP sockets.
func readInputUdp(conn net.UDPConn, parseChannel chan []byte, logger Logger, config *ConfigValues) {
// config.Connection.Udp.Maxpacket is our max read
// Large buffer to handle high UDP traffic, and manage GC pressure
bufSize := 1 << 20
buf := make([]byte, bufSize)
offset := 0
flush := func() []byte {
parseChannel <- buf[0:offset]
offset = 0
return make([]byte, bufSize)
}
// Set initial deadline: 500ms
sockErr := conn.SetDeadline(time.Now().Add(time.Millisecond * 500))
if sockErr != nil {
logger.Error.Printf("Error seting socket deadline: %s", sockErr)
panic(sockErr)
}
for {
length, err := conn.Read(buf[offset : offset+config.Connection.Udp.Maxpacket])
if err == nil {
// Always delimit our metrics
buf[offset+length] = '\n'
offset = offset + length + 1
} else if terr, ok := err.(net.Error); ok && terr.Timeout() {
if offset > 0 {
buf = flush()
}
sockErr = conn.SetDeadline(time.Now().Add(time.Millisecond * 500))
if sockErr != nil {
panic(sockErr)
}
} else if strings.HasSuffix(err.Error(), "use of closed network connection") {
// Go, it would be great if there was a better way to detect
// this error...an enum?
// Connection closed, lets wrap up and finish
logger.Info.Printf("Stopping UDP read goroutine.")
return
} else {
logger.Error.Println("UDP read error:", err)
}
// Full Buffer?
if bufSize-offset <= config.Connection.Udp.Maxpacket {
buf = flush()
}
// Track the number of UDP packets we read
UdpPackets++
}
}
func TestHandlePing_WrongNode(t *testing.T) {
m := GetMemberlist(t)
m.config.EnableCompression = false
defer m.Shutdown()
var udp *net.UDPConn
for port := 60000; port < 61000; port++ {
udpAddr := fmt.Sprintf("127.0.0.1:%d", port)
udpLn, err := net.ListenPacket("udp", udpAddr)
if err == nil {
udp = udpLn.(*net.UDPConn)
break
}
}
if udp == nil {
t.Fatalf("no udp listener")
}
// Encode a ping, wrong node!
ping := ping{SeqNo: 42, Node: m.config.Name + "-bad"}
buf, err := encode(pingMsg, ping)
if err != nil {
t.Fatalf("unexpected err %s", err)
}
// Send
addr := &net.UDPAddr{IP: net.ParseIP(m.config.BindAddr), Port: m.config.BindPort}
udp.WriteTo(buf.Bytes(), addr)
// Wait for response
udp.SetDeadline(time.Now().Add(50 * time.Millisecond))
in := make([]byte, 1500)
_, _, err = udp.ReadFrom(in)
// Should get an i/o timeout
if err == nil {
t.Fatalf("expected err %s", err)
}
}
func (sfa *SFlowAgent) feedFlowTable(conn *net.UDPConn) {
var buf [maxDgramSize]byte
_, _, err := conn.ReadFromUDP(buf[:])
if err != nil {
conn.SetDeadline(time.Now().Add(1 * time.Second))
return
}
p := gopacket.NewPacket(buf[:], layers.LayerTypeSFlow, gopacket.Default)
sflowLayer := p.Layer(layers.LayerTypeSFlow)
sflowPacket, ok := sflowLayer.(*layers.SFlowDatagram)
if !ok {
return
}
if sflowPacket.SampleCount > 0 {
for _, sample := range sflowPacket.FlowSamples {
flows := flow.FlowsFromSFlowSample(sfa.flowTable, &sample, sfa.FlowProbePathSetter)
logging.GetLogger().Debugf("%d flows captured", len(flows))
}
}
}
func (this *Service) P2pService(sock *net.UDPConn) {
this.WaitGroup.AddOne()
defer this.WaitGroup.Done()
exitNotify := this.WaitGroup.ExitNotify()
var buf [2048]byte
for {
select {
case <-exitNotify:
return
default:
}
sock.SetDeadline(time.Now().Add(NET_READ_MAX_DATELINE))
n, addr, err := sock.ReadFromUDP(buf[:])
if err != nil {
syslog.Info(err)
continue
}
if n < 4 {
syslog.Info("udp data package too small")
continue
}
sid := binary.BigEndian.Uint32(buf[:4])
this.RWMutex.RLock()
client, ok := this.ClientMap[sid]
this.RWMutex.RUnlock()
if ok == false {
syslog.Debug("client not exist!!! sid:", sid)
continue
}
client.IP = util.IPToInt(addr.String())
client.Port = uint32(addr.Port)
if _, err := sock.WriteToUDP([]byte(addr.String()), addr); err != nil {
syslog.Info("udp send data failed!!!", err)
continue
}
}
}
// ListenUDPConn is similar to Listen, but takes an already existing
// net.UDPConn and listens for CurveCP on top of that. The CurveCP
// address is the UDPConn's LocalAddr().
//
// The main use of ListenUDPConn is to first execute a NAT-busting
// protocol on the UDPConn, and then use CurveCP to communicate with
// the peer.
func ListenUDPConn(sock *net.UDPConn, key []byte) (net.Listener, error) {
sock.SetDeadline(time.Time{})
return newServer(sock, key), nil
}
func newConn(sock *net.UDPConn, local, remote net.Addr) *Conn {
sock.SetDeadline(time.Time{})
return &Conn{sock, local, remote}
}