mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-14 02:53:02 +00:00
339 lines
9.9 KiB
Go
339 lines
9.9 KiB
Go
package outbound
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import (
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"context"
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"crypto/rand"
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goerrors "errors"
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"io"
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"math/big"
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gonet "net"
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"os"
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"github.com/xtls/xray-core/app/proxyman"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/mux"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/net/cnc"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/features/outbound"
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"github.com/xtls/xray-core/features/policy"
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"github.com/xtls/xray-core/features/stats"
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"github.com/xtls/xray-core/proxy"
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"github.com/xtls/xray-core/transport"
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"github.com/xtls/xray-core/transport/internet"
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"github.com/xtls/xray-core/transport/internet/stat"
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"github.com/xtls/xray-core/transport/internet/tls"
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"github.com/xtls/xray-core/transport/pipe"
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)
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func getStatCounter(v *core.Instance, tag string) (stats.Counter, stats.Counter) {
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var uplinkCounter stats.Counter
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var downlinkCounter stats.Counter
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policy := v.GetFeature(policy.ManagerType()).(policy.Manager)
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if len(tag) > 0 && policy.ForSystem().Stats.OutboundUplink {
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statsManager := v.GetFeature(stats.ManagerType()).(stats.Manager)
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name := "outbound>>>" + tag + ">>>traffic>>>uplink"
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c, _ := stats.GetOrRegisterCounter(statsManager, name)
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if c != nil {
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uplinkCounter = c
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}
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}
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if len(tag) > 0 && policy.ForSystem().Stats.OutboundDownlink {
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statsManager := v.GetFeature(stats.ManagerType()).(stats.Manager)
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name := "outbound>>>" + tag + ">>>traffic>>>downlink"
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c, _ := stats.GetOrRegisterCounter(statsManager, name)
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if c != nil {
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downlinkCounter = c
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}
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}
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return uplinkCounter, downlinkCounter
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}
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// Handler implements 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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xudp *mux.ClientManager
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udp443 string
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uplinkCounter stats.Counter
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downlinkCounter stats.Counter
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}
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// NewHandler creates 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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uplinkCounter, downlinkCounter := getStatCounter(v, config.Tag)
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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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uplinkCounter: uplinkCounter,
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downlinkCounter: downlinkCounter,
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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, errors.New("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, errors.New("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, errors.New("not an outbound handler")
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}
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if h.senderSettings != nil && h.senderSettings.MultiplexSettings != nil {
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if config := h.senderSettings.MultiplexSettings; config.Enabled {
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if config.Concurrency < 0 {
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h.mux = &mux.ClientManager{Enabled: false}
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}
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if config.Concurrency == 0 {
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config.Concurrency = 8 // same as before
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}
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if config.Concurrency > 0 {
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h.mux = &mux.ClientManager{
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Enabled: true,
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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: uint32(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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if config.XudpConcurrency < 0 {
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h.xudp = &mux.ClientManager{Enabled: false}
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}
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if config.XudpConcurrency == 0 {
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h.xudp = nil // same as before
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}
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if config.XudpConcurrency > 0 {
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h.xudp = &mux.ClientManager{
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Enabled: true,
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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: uint32(config.XudpConcurrency),
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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.udp443 = config.XudpProxyUDP443
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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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outbounds := session.OutboundsFromContext(ctx)
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ob := outbounds[len(outbounds)-1]
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if ob.Target.Network == net.Network_UDP && ob.OriginalTarget.Address != nil && ob.OriginalTarget.Address != ob.Target.Address {
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link.Reader = &buf.EndpointOverrideReader{Reader: link.Reader, Dest: ob.Target.Address, OriginalDest: ob.OriginalTarget.Address}
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link.Writer = &buf.EndpointOverrideWriter{Writer: link.Writer, Dest: ob.Target.Address, OriginalDest: ob.OriginalTarget.Address}
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}
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if h.mux != nil {
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test := func(err error) {
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if err != nil {
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err := errors.New("failed to process mux outbound traffic").Base(err)
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session.SubmitOutboundErrorToOriginator(ctx, err)
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errors.LogInfo(ctx, err.Error())
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common.Interrupt(link.Writer)
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}
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}
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if ob.Target.Network == net.Network_UDP && ob.Target.Port == 443 {
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switch h.udp443 {
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case "reject":
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test(errors.New("XUDP rejected UDP/443 traffic").AtInfo())
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return
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case "skip":
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goto out
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}
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}
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if h.xudp != nil && ob.Target.Network == net.Network_UDP {
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if !h.xudp.Enabled {
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goto out
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}
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test(h.xudp.Dispatch(ctx, link))
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return
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}
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if h.mux.Enabled {
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test(h.mux.Dispatch(ctx, link))
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return
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}
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}
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out:
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err := h.proxy.Process(ctx, link, h)
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if err != nil {
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if goerrors.Is(err, io.EOF) || goerrors.Is(err, io.ErrClosedPipe) || goerrors.Is(err, context.Canceled) {
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err = nil
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}
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}
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if err != nil {
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// Ensure outbound ray is properly closed.
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err := errors.New("failed to process outbound traffic").Base(err)
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session.SubmitOutboundErrorToOriginator(ctx, err)
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errors.LogInfo(ctx, err.Error())
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common.Interrupt(link.Writer)
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} else {
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common.Close(link.Writer)
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}
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common.Interrupt(link.Reader)
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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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func (h *Handler) DestIpAddress() net.IP {
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return internet.DestIpAddress()
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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) (stat.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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errors.LogDebug(ctx, "proxying to ", tag, " for dest ", dest)
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outbounds := session.OutboundsFromContext(ctx)
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ctx = session.ContextWithOutbounds(ctx, append(outbounds, &session.Outbound{
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Target: dest,
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Tag: tag,
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})) // add another outbound in session ctx
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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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conn := cnc.NewConnection(cnc.ConnectionInputMulti(uplinkWriter), cnc.ConnectionOutputMulti(downlinkReader))
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if config := tls.ConfigFromStreamSettings(h.streamSettings); config != nil {
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tlsConfig := config.GetTLSConfig(tls.WithDestination(dest))
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conn = tls.Client(conn, tlsConfig)
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}
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return h.getStatCouterConnection(conn), nil
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}
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errors.LogWarning(ctx, "failed to get outbound handler with tag: ", tag)
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}
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if h.senderSettings.Via != nil {
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outbounds := session.OutboundsFromContext(ctx)
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ob := outbounds[len(outbounds)-1]
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if h.senderSettings.ViaCidr == "" {
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ob.Gateway = h.senderSettings.Via.AsAddress()
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} else { //Get a random address.
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ob.Gateway = ParseRandomIPv6(h.senderSettings.Via.AsAddress(), h.senderSettings.ViaCidr)
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}
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}
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}
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if conn, err := h.getUoTConnection(ctx, dest); err != os.ErrInvalid {
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return conn, err
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}
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conn, err := internet.Dial(ctx, dest, h.streamSettings)
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conn = h.getStatCouterConnection(conn)
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outbounds := session.OutboundsFromContext(ctx)
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ob := outbounds[len(outbounds)-1]
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ob.Conn = conn
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return conn, err
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}
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func (h *Handler) getStatCouterConnection(conn stat.Connection) stat.Connection {
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if h.uplinkCounter != nil || h.downlinkCounter != nil {
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return &stat.CounterConnection{
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Connection: conn,
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ReadCounter: h.downlinkCounter,
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WriteCounter: h.uplinkCounter,
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}
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}
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return conn
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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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func ParseRandomIPv6(address net.Address, prefix string) net.Address {
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_, network, _ := gonet.ParseCIDR(address.IP().String() + "/" + prefix)
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maskSize, totalBits := network.Mask.Size()
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subnetSize := big.NewInt(1).Lsh(big.NewInt(1), uint(totalBits-maskSize))
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// random
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randomBigInt, _ := rand.Int(rand.Reader, subnetSize)
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startIPBigInt := big.NewInt(0).SetBytes(network.IP.To16())
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randomIPBigInt := big.NewInt(0).Add(startIPBigInt, randomBigInt)
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randomIPBytes := randomIPBigInt.Bytes()
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randomIPBytes = append(make([]byte, 16-len(randomIPBytes)), randomIPBytes...)
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return net.ParseAddress(gonet.IP(randomIPBytes).String())
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}
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