mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-12-28 00:19:48 +00:00
286 lines
8.5 KiB
Go
286 lines
8.5 KiB
Go
package outbound
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import (
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"context"
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"github.com/xtls/xray-core/features/dns"
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"github.com/xtls/xray-core/transport/internet/stat"
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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/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/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 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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dnsClient dns.Client
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mux *mux.ClientManager
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uplinkCounter stats.Counter
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downlinkCounter stats.Counter
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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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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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dnsClient: v.GetFeature(dns.ClientType()).(dns.Client),
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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, 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 {
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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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Enabled: h.senderSettings.MultiplexSettings.Enabled,
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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 && (h.mux.Enabled || session.MuxPreferedFromContext(ctx)) {
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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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outbound := session.OutboundFromContext(ctx)
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destination := outbound.Target
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var domainString string
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if destination.Address.Family().IsDomain() {
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domainString = destination.Address.Domain()
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} else if outbound.RouteTarget.Address != nil && outbound.RouteTarget.Address.Family().IsDomain() {
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domainString = outbound.RouteTarget.Address.Domain()
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} else {
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domainString = ""
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}
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if h.senderSettings != nil && h.senderSettings.DomainStrategy != proxyman.DomainStrategy_AS_IS && domainString != "" {
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var ips []net.IP
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var err error
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option := dns.IPOption{
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IPv4Enable: true,
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IPv6Enable: true,
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FakeEnable: false,
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}
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switch h.senderSettings.DomainStrategy {
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case proxyman.DomainStrategy_USE_IP4:
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option.IPv6Enable = false
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case proxyman.DomainStrategy_USE_IP6:
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option.IPv4Enable = false
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}
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ips, err = h.dnsClient.LookupIP(domainString, option)
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if err == nil {
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switch h.senderSettings.DomainStrategy {
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case proxyman.DomainStrategy_PREFER_IP4:
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ips = reorderAddresses(ips, false)
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case proxyman.DomainStrategy_PREFER_IP6:
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ips = reorderAddresses(ips, true)
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}
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destination.Address = net.IPAddress(ips[0])
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outbound.Target = destination
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}
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}
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err := h.proxy.Process(ctx, link, h)
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if 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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func reorderAddresses(ips []net.IP, preferIPv6 bool) []net.IP {
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var result []net.IP
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for i := 0; i < 2; i++ {
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for _, ip := range ips {
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if (preferIPv6 == (i == 0)) == (ip.To4() == nil) {
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result = append(result, ip)
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}
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}
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}
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return result
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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) (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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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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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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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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conn, err := internet.Dial(ctx, dest, h.streamSettings)
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return h.getStatCouterConnection(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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