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Merge pull request #54 from tobyxdd/wip-udp-relay
UDP Relay
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| package relay | ||
|
|
||
| import ( | ||
| "errors" | ||
| "github.com/tobyxdd/hysteria/pkg/core" | ||
| "net" | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
| ) | ||
|
|
||
| const udpBufferSize = 65535 | ||
|
|
||
| const udpMinTimeout = 4 * time.Second | ||
|
|
||
| var ErrTimeout = errors.New("inactivity timeout") | ||
|
|
||
| type UDPRelay struct { | ||
| HyClient *core.Client | ||
| ListenAddr *net.UDPAddr | ||
| Remote string | ||
| Timeout time.Duration | ||
|
|
||
| ConnFunc func(addr net.Addr) | ||
| ErrorFunc func(addr net.Addr, err error) | ||
| } | ||
|
|
||
| func NewUDPRelay(hyClient *core.Client, listen, remote string, timeout time.Duration, | ||
| connFunc func(addr net.Addr), errorFunc func(addr net.Addr, err error)) (*UDPRelay, error) { | ||
| uAddr, err := net.ResolveUDPAddr("udp", listen) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| r := &UDPRelay{ | ||
| HyClient: hyClient, | ||
| ListenAddr: uAddr, | ||
| Remote: remote, | ||
| Timeout: timeout, | ||
| ConnFunc: connFunc, | ||
| ErrorFunc: errorFunc, | ||
| } | ||
| if timeout == 0 { | ||
| r.Timeout = 1 * time.Minute | ||
| } else if timeout < udpMinTimeout { | ||
| r.Timeout = udpMinTimeout | ||
| } | ||
| return r, nil | ||
| } | ||
|
|
||
| type cmEntry struct { | ||
| HyConn core.UDPConn | ||
| Addr *net.UDPAddr | ||
| LastActiveTime atomic.Value | ||
| } | ||
|
|
||
| func (r *UDPRelay) ListenAndServe() error { | ||
| conn, err := net.ListenUDP("udp", r.ListenAddr) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer conn.Close() | ||
| // src <-> HyClient UDPConn | ||
| connMap := make(map[string]*cmEntry) | ||
| var connMapMutex sync.RWMutex | ||
| // Timeout cleanup routine | ||
| stopChan := make(chan bool) | ||
| defer close(stopChan) | ||
| go func() { | ||
| ticker := time.NewTicker(udpMinTimeout) | ||
| defer ticker.Stop() | ||
| for { | ||
| select { | ||
| case <-stopChan: | ||
| return | ||
| case t := <-ticker.C: | ||
| allowedLAT := t.Add(-r.Timeout) | ||
| connMapMutex.Lock() | ||
| for k, v := range connMap { | ||
| if v.LastActiveTime.Load().(time.Time).Before(allowedLAT) { | ||
| // Timeout | ||
| r.ErrorFunc(v.Addr, ErrTimeout) | ||
| _ = v.HyConn.Close() | ||
| delete(connMap, k) | ||
| } | ||
| } | ||
| connMapMutex.Unlock() | ||
| } | ||
| } | ||
| }() | ||
| // Read loop | ||
| buf := make([]byte, udpBufferSize) | ||
| for { | ||
| n, rAddr, err := conn.ReadFromUDP(buf) | ||
| if n > 0 { | ||
| connMapMutex.RLock() | ||
| cme := connMap[rAddr.String()] | ||
| connMapMutex.RUnlock() | ||
| if cme != nil { | ||
| // Existing conn | ||
| cme.LastActiveTime.Store(time.Now()) | ||
| _ = cme.HyConn.WriteTo(buf[:n], r.Remote) | ||
| } else { | ||
| // New | ||
| r.ConnFunc(rAddr) | ||
| hyConn, err := r.HyClient.DialUDP() | ||
| if err != nil { | ||
| r.ErrorFunc(rAddr, err) | ||
| } else { | ||
| // Add it to the map | ||
| ent := &cmEntry{HyConn: hyConn, Addr: rAddr} | ||
| ent.LastActiveTime.Store(time.Now()) | ||
| connMapMutex.Lock() | ||
| connMap[rAddr.String()] = ent | ||
| connMapMutex.Unlock() | ||
| // Start remote to local | ||
| go func() { | ||
| for { | ||
| bs, _, err := hyConn.ReadFrom() | ||
| if err != nil { | ||
| break | ||
| } | ||
| ent.LastActiveTime.Store(time.Now()) | ||
| _, _ = conn.WriteToUDP(bs, rAddr) | ||
| } | ||
| }() | ||
| // Send the packet | ||
| _ = hyConn.WriteTo(buf[:n], r.Remote) | ||
| } | ||
| } | ||
| } | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| } |