2017-01-14 18:48:37 -05:00
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package outbound
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import (
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"context"
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"v2ray.com/core"
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"v2ray.com/core/app/proxyman"
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"v2ray.com/core/common"
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"v2ray.com/core/common/mux"
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"v2ray.com/core/common/net"
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"v2ray.com/core/common/session"
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"v2ray.com/core/features/outbound"
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"v2ray.com/core/proxy"
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"v2ray.com/core/transport"
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"v2ray.com/core/transport/internet"
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"v2ray.com/core/transport/pipe"
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)
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2018-10-22 02:26:03 -04:00
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// Handler is an implements of outbound.Handler.
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type Handler struct {
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tag string
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senderSettings *proxyman.SenderConfig
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streamSettings *internet.MemoryStreamConfig
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proxy proxy.Outbound
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outboundManager outbound.Manager
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mux *mux.ClientManager
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}
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// NewHandler create a new Handler based on the given configuration.
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func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbound.Handler, error) {
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v := core.MustFromContext(ctx)
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h := &Handler{
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tag: config.Tag,
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outboundManager: v.GetFeature(outbound.ManagerType()).(outbound.Manager),
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}
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if config.SenderSettings != nil {
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senderSettings, err := config.SenderSettings.GetInstance()
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if err != nil {
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return nil, err
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}
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switch s := senderSettings.(type) {
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case *proxyman.SenderConfig:
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h.senderSettings = s
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mss, err := internet.ToMemoryStreamConfig(s.StreamSettings)
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if err != nil {
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return nil, newError("failed to parse stream settings").Base(err).AtWarning()
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}
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h.streamSettings = mss
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default:
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return nil, newError("settings is not SenderConfig")
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}
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}
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proxyConfig, err := config.ProxySettings.GetInstance()
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if err != nil {
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return nil, err
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}
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rawProxyHandler, err := common.CreateObject(ctx, proxyConfig)
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if err != nil {
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return nil, err
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}
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proxyHandler, ok := rawProxyHandler.(proxy.Outbound)
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if !ok {
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return nil, newError("not an outbound handler")
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}
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if h.senderSettings != nil && h.senderSettings.MultiplexSettings != nil && h.senderSettings.MultiplexSettings.Enabled {
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config := h.senderSettings.MultiplexSettings
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if config.Concurrency < 1 || config.Concurrency > 1024 {
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return nil, newError("invalid mux concurrency: ", config.Concurrency).AtWarning()
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}
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h.mux = &mux.ClientManager{
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Picker: &mux.IncrementalWorkerPicker{
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Factory: &mux.DialingWorkerFactory{
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Proxy: proxyHandler,
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Dialer: h,
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Strategy: mux.ClientStrategy{
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MaxConcurrency: config.Concurrency,
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MaxConnection: 128,
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},
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},
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},
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}
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}
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h.proxy = proxyHandler
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return h, nil
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}
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// Tag implements outbound.Handler.
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func (h *Handler) Tag() string {
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return h.tag
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}
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// Dispatch implements proxy.Outbound.Dispatch.
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func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
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if h.mux != nil {
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if err := h.mux.Dispatch(ctx, link); err != nil {
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newError("failed to process mux outbound traffic").Base(err).WriteToLog(session.ExportIDToError(ctx))
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common.Interrupt(link.Writer)
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}
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} else {
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if err := h.proxy.Process(ctx, link, h); err != nil {
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// Ensure outbound ray is properly closed.
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newError("failed to process outbound traffic").Base(err).WriteToLog(session.ExportIDToError(ctx))
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common.Interrupt(link.Writer)
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} else {
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common.Must(common.Close(link.Writer))
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}
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common.Interrupt(link.Reader)
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}
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}
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// Address implements internet.Dialer.
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func (h *Handler) Address() net.Address {
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if h.senderSettings == nil || h.senderSettings.Via == nil {
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return nil
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}
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return h.senderSettings.Via.AsAddress()
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}
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// Dial implements internet.Dialer.
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func (h *Handler) Dial(ctx context.Context, dest net.Destination) (internet.Connection, error) {
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if h.senderSettings != nil {
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if h.senderSettings.ProxySettings.HasTag() {
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tag := h.senderSettings.ProxySettings.Tag
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handler := h.outboundManager.GetHandler(tag)
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if handler != nil {
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newError("proxying to ", tag, " for dest ", dest).AtDebug().WriteToLog(session.ExportIDToError(ctx))
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ctx = session.ContextWithOutbound(ctx, &session.Outbound{
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Target: dest,
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})
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opts := pipe.OptionsFromContext(ctx)
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uplinkReader, uplinkWriter := pipe.New(opts...)
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downlinkReader, downlinkWriter := pipe.New(opts...)
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go handler.Dispatch(ctx, &transport.Link{Reader: uplinkReader, Writer: downlinkWriter})
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return net.NewConnection(net.ConnectionInputMulti(uplinkWriter), net.ConnectionOutputMulti(downlinkReader)), nil
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}
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newError("failed to get outbound handler with tag: ", tag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
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}
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if h.senderSettings.Via != nil {
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outbound := session.OutboundFromContext(ctx)
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if outbound == nil {
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outbound = new(session.Outbound)
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ctx = session.ContextWithOutbound(ctx, outbound)
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}
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outbound.Gateway = h.senderSettings.Via.AsAddress()
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}
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}
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return internet.Dial(ctx, dest, h.streamSettings)
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}
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// GetOutbound implements proxy.GetOutbound.
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func (h *Handler) GetOutbound() proxy.Outbound {
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return h.proxy
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}
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// Start implements common.Runnable.
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func (h *Handler) Start() error {
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return nil
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}
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// Close implements common.Closable.
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func (h *Handler) Close() error {
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common.Close(h.mux)
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return nil
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}
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