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port hopping when traffic in #3

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port hopping when traffic in #3

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36 changes: 12 additions & 24 deletions hysteria2/client.go
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,7 @@ type Client struct {
serverAddr atomic.TypedValue[M.Socksaddr]
serverAddrs []M.Socksaddr
hopInterval time.Duration
hopAt int64
sendBPS uint64
receiveBPS uint64
salamanderPassword string
Expand Down Expand Up @@ -87,6 +88,7 @@ func NewClient(options ClientOptions) (*Client, error) {
brutalDebug: options.BrutalDebug,
serverAddrs: options.ServerAddresses,
hopInterval: options.HopInterval,
hopAt: time.Now().UnixMilli(),
sendBPS: options.SendBPS,
receiveBPS: options.ReceiveBPS,
salamanderPassword: options.SalamanderPassword,
Expand All @@ -101,27 +103,6 @@ func NewClient(options ClientOptions) (*Client, error) {
return client, nil
}

func (c *Client) hopLoop(conn *clientQUICConnection) {
ticker := time.NewTicker(c.hopInterval)
defer ticker.Stop()
c.logger.Info("Entering hop loop ...")
for {
select {
case <-ticker.C:
serverAddr := c.serverAddrs[rand.Intn(len(c.serverAddrs))]
c.serverAddr.Store(serverAddr)
conn.quicConn.SetRemoteAddr(serverAddr.UDPAddr())
c.logger.Info("Hopped to ", serverAddr)
continue
case <-c.ctx.Done():
case <-conn.quicConn.Context().Done():
case <-conn.connDone:
}
c.logger.Info("Exiting hop loop ...")
return
}
}

func (c *Client) offer(ctx context.Context) (*clientQUICConnection, error) {
conn := c.conn
if conn != nil && conn.active() {
Expand Down Expand Up @@ -202,13 +183,19 @@ func (c *Client) offerNew(ctx context.Context) (*clientQUICConnection, error) {
go c.loopMessages(conn)
}
c.conn = conn
if len(c.serverAddrs) > 0 {
go c.hopLoop(conn)
}

return conn, nil
}

func (c *Client) DialConn(ctx context.Context, destination M.Socksaddr) (net.Conn, error) {
if len(c.serverAddrs) > 0 && time.Now().UnixMilli()-c.hopAt > c.hopInterval.Milliseconds() {
serverAddr := c.serverAddrs[rand.Intn(len(c.serverAddrs))]
c.serverAddr.Store(serverAddr)
c.conn.quicConn.SetRemoteAddr(serverAddr.UDPAddr())
c.hopAt = time.Now().UnixMilli()
c.logger.Info("Hopped to ", serverAddr)
}

conn, err := c.offer(ctx)
if err != nil {
return nil, err
Expand All @@ -227,6 +214,7 @@ func (c *Client) ListenPacket(ctx context.Context) (net.PacketConn, error) {
if c.udpDisabled {
return nil, os.ErrInvalid
}

conn, err := c.offer(ctx)
if err != nil {
return nil, err
Expand Down