add router handler & connector
This commit is contained in:
ginuerzh
@@ -0,0 +1,268 @@
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package router
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import (
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"context"
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"errors"
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"net"
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"strconv"
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"time"
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"github.com/go-gost/core/handler"
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"github.com/go-gost/core/limiter"
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"github.com/go-gost/core/limiter/traffic"
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"github.com/go-gost/core/logger"
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md "github.com/go-gost/core/metadata"
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"github.com/go-gost/core/observer"
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"github.com/go-gost/core/service"
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"github.com/go-gost/relay"
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ctxvalue "github.com/go-gost/x/ctx"
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limiter_util "github.com/go-gost/x/internal/util/limiter"
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stats_util "github.com/go-gost/x/internal/util/stats"
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rate_limiter "github.com/go-gost/x/limiter/rate"
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"github.com/go-gost/x/registry"
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"github.com/google/uuid"
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)
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var (
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ErrBadVersion = errors.New("bad version")
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ErrUnknownCmd = errors.New("unknown command")
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ErrRouterID = errors.New("invalid router ID")
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ErrRouterNotAvailable = errors.New("router not available")
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ErrUnauthorized = errors.New("unauthorized")
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ErrTunnelRoute = errors.New("no route to host")
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)
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func init() {
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registry.HandlerRegistry().Register("router", NewHandler)
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}
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type routerHandler struct {
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id string
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options handler.Options
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pool *ConnectorPool
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epSvc service.Service
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md metadata
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log logger.Logger
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stats *stats_util.HandlerStats
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limiter traffic.TrafficLimiter
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cancel context.CancelFunc
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}
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func NewHandler(opts ...handler.Option) handler.Handler {
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options := handler.Options{}
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for _, opt := range opts {
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opt(&options)
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}
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return &routerHandler{
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options: options,
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}
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}
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func (h *routerHandler) Init(md md.Metadata) (err error) {
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if err := h.parseMetadata(md); err != nil {
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return err
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}
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uuid, err := uuid.NewRandom()
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if err != nil {
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return err
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}
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h.id = uuid.String()
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h.log = h.options.Logger.WithFields(map[string]any{
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"node": h.id,
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})
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h.pool = NewConnectorPool(h.id)
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/*
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for _, ro := range h.options.Recorders {
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if ro.Record == xrecorder.RecorderServiceHandler {
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h.ep.recorder = ro
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break
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}
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}
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*/
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ctx, cancel := context.WithCancel(context.Background())
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h.cancel = cancel
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if h.options.Observer != nil {
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h.stats = stats_util.NewHandlerStats(h.options.Service, h.md.observerResetTraffic)
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go h.observeStats(ctx)
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}
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if h.options.Limiter != nil {
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h.limiter = limiter_util.NewCachedTrafficLimiter(h.options.Limiter,
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limiter_util.RefreshIntervalOption(h.md.limiterRefreshInterval),
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limiter_util.CleanupIntervalOption(h.md.limiterCleanupInterval),
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limiter_util.ScopeOption(limiter.ScopeClient),
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)
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}
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return nil
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}
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func (h *routerHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.HandleOption) (err error) {
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defer conn.Close()
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start := time.Now()
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log := h.log.WithFields(map[string]any{
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"remote": conn.RemoteAddr().String(),
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"local": conn.LocalAddr().String(),
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"sid": ctxvalue.SidFromContext(ctx),
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})
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log.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
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defer func() {
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log.WithFields(map[string]any{
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"duration": time.Since(start),
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}).Infof("%s >< %s", conn.RemoteAddr(), conn.LocalAddr())
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}()
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if !h.checkRateLimit(conn.RemoteAddr()) {
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return rate_limiter.ErrRateLimit
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}
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if h.md.readTimeout > 0 {
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conn.SetReadDeadline(time.Now().Add(h.md.readTimeout))
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}
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req := relay.Request{}
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if _, err := req.ReadFrom(conn); err != nil {
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return err
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}
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conn.SetReadDeadline(time.Time{})
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resp := relay.Response{
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Version: relay.Version1,
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Status: relay.StatusOK,
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}
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if req.Version != relay.Version1 {
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resp.Status = relay.StatusBadRequest
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resp.WriteTo(conn)
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return ErrBadVersion
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}
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var user, pass string
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var srcAddr, dstAddr string
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network := "ip"
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var routerID relay.TunnelID
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for _, f := range req.Features {
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switch f.Type() {
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case relay.FeatureUserAuth:
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if feature, _ := f.(*relay.UserAuthFeature); feature != nil {
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user, pass = feature.Username, feature.Password
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}
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case relay.FeatureAddr:
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if feature, _ := f.(*relay.AddrFeature); feature != nil {
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v := net.JoinHostPort(feature.Host, strconv.Itoa(int(feature.Port)))
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if srcAddr != "" {
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dstAddr = v
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} else {
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srcAddr = v
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}
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}
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case relay.FeatureTunnel:
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if feature, _ := f.(*relay.TunnelFeature); feature != nil {
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routerID = feature.ID
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}
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case relay.FeatureNetwork:
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if feature, _ := f.(*relay.NetworkFeature); feature != nil {
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network = feature.Network.String()
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}
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}
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}
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if routerID.IsZero() {
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resp.Status = relay.StatusBadRequest
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resp.WriteTo(conn)
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return ErrRouterID
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}
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if user != "" {
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log = log.WithFields(map[string]any{"user": user})
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}
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if h.options.Auther != nil {
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clientID, ok := h.options.Auther.Authenticate(ctx, user, pass)
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if !ok {
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resp.Status = relay.StatusUnauthorized
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resp.WriteTo(conn)
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return ErrUnauthorized
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}
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ctx = ctxvalue.ContextWithClientID(ctx, ctxvalue.ClientID(clientID))
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}
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switch req.Cmd & relay.CmdMask {
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case relay.CmdAssociate:
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host, _, _ := net.SplitHostPort(dstAddr)
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log.Debugf("associate %s/%s -> %s", host, network, routerID)
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return h.handleAssociate(ctx, conn, network, host, routerID, log)
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default:
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resp.Status = relay.StatusBadRequest
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resp.WriteTo(conn)
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return ErrUnknownCmd
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}
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}
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// Close implements io.Closer interface.
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func (h *routerHandler) Close() error {
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if h.epSvc != nil {
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h.epSvc.Close()
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}
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h.pool.Close()
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if h.cancel != nil {
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h.cancel()
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}
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return nil
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}
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func (h *routerHandler) checkRateLimit(addr net.Addr) bool {
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if h.options.RateLimiter == nil {
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return true
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}
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host, _, _ := net.SplitHostPort(addr.String())
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if limiter := h.options.RateLimiter.Limiter(host); limiter != nil {
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return limiter.Allow(1)
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}
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return true
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}
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func (h *routerHandler) observeStats(ctx context.Context) {
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if h.options.Observer == nil {
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return
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}
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var events []observer.Event
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ticker := time.NewTicker(h.md.observerPeriod)
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defer ticker.Stop()
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for {
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select {
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case <-ticker.C:
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if len(events) > 0 {
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if err := h.options.Observer.Observe(ctx, events); err == nil {
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events = nil
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}
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break
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}
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evs := h.stats.Events()
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if err := h.options.Observer.Observe(ctx, evs); err != nil {
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events = evs
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}
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case <-ctx.Done():
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return
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}
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}
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}
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