add router handler & connector
This commit is contained in:
ginuerzh
@@ -0,0 +1,262 @@
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package router
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import (
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"context"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"math"
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"net"
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"sync"
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"github.com/go-gost/core/common/bufpool"
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"github.com/go-gost/core/limiter"
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"github.com/go-gost/core/logger"
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"github.com/go-gost/core/observer/stats"
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"github.com/go-gost/core/router"
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"github.com/go-gost/core/sd"
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"github.com/go-gost/relay"
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xip "github.com/go-gost/x/internal/net/ip"
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traffic_wrapper "github.com/go-gost/x/limiter/traffic/wrapper"
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stats_wrapper "github.com/go-gost/x/observer/stats/wrapper"
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"github.com/go-gost/x/registry"
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"github.com/google/uuid"
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"github.com/songgao/water/waterutil"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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)
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func (h *routerHandler) handleAssociate(ctx context.Context, conn net.Conn, network, host string, routerID relay.TunnelID, log logger.Logger) (err error) {
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log = log.WithFields(map[string]any{
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"dst": fmt.Sprintf("%s/%s", host, network),
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"cmd": "associate",
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"router": routerID.String(),
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"host": host,
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})
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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 ingress := h.md.ingress; ingress != nil && host != "" {
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var rid relay.TunnelID
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if rule := ingress.GetRule(ctx, host); rule != nil {
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rid = parseRouterID(rule.Endpoint)
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}
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if rid.IsZero() || !rid.Equal(routerID) {
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resp.Status = relay.StatusHostUnreachable
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resp.WriteTo(conn)
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err := fmt.Errorf("no route to host %s", host)
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log.Error(err)
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return err
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}
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}
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uuid, err := uuid.NewRandom()
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if err != nil {
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resp.Status = relay.StatusInternalServerError
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resp.WriteTo(conn)
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return
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}
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connectorID := relay.NewConnectorID(uuid[:])
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resp.Features = append(resp.Features,
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&relay.TunnelFeature{
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ID: connectorID,
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},
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)
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resp.WriteTo(conn)
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conn = &packetConn{conn}
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clientID := fmt.Sprintf("%s@%s", host, routerID)
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var stats stats.Stats
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if h.stats != nil {
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stats = h.stats.Stats(clientID)
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}
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conn = stats_wrapper.WrapConn(conn, stats)
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conn = traffic_wrapper.WrapConn(
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conn,
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h.limiter,
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clientID,
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limiter.ScopeOption(limiter.ScopeClient),
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limiter.ServiceOption(h.options.Service),
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limiter.ClientOption(clientID),
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limiter.NetworkOption(network),
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limiter.SrcOption(conn.RemoteAddr().String()),
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)
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h.pool.Add(routerID, NewConnector(routerID, connectorID, host, LockWriter(conn), &ConnectorOptions{}))
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defer h.pool.Del(routerID, host, connectorID)
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if h.md.sd != nil {
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err := h.md.sd.Register(ctx, &sd.Service{
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ID: connectorID.String(),
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Name: clientID,
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Node: h.id,
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Network: network,
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Address: h.md.entryPoint,
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})
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if err != nil {
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h.log.Error(err)
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}
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defer h.md.sd.Deregister(ctx, &sd.Service{
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ID: connectorID.String(),
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Name: clientID,
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Node: h.id,
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})
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}
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log.Debugf("%s/%s: router=%s, connector=%s, weight=%d established", host, network, routerID, connectorID, connectorID.Weight())
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return h.routing(ctx, conn, routerID, log)
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}
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func (h *routerHandler) routing(ctx context.Context, conn net.Conn, routerID relay.TunnelID, log logger.Logger) error {
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b := bufpool.Get(h.md.bufferSize)
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defer bufpool.Put(b)
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rid := routerID.String()
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for {
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err := func() error {
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n, err := conn.Read(b)
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if err != nil {
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return err
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}
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var dstIP net.IP
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if waterutil.IsIPv4(b[:n]) {
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header, err := ipv4.ParseHeader(b[:n])
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if err != nil {
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log.Warn(err)
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return nil
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}
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dstIP = header.Dst
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if log.IsLevelEnabled(logger.TraceLevel) {
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log.Tracef("%s >> %s %-4s %d/%-4d %-4x %d",
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header.Src, header.Dst, xip.Protocol(waterutil.IPv4Protocol(b[:n])),
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header.Len, header.TotalLen, header.ID, header.Flags)
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}
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} else if waterutil.IsIPv6(b[:n]) {
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header, err := ipv6.ParseHeader(b[:n])
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if err != nil {
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log.Warn(err)
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return nil
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}
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dstIP = header.Dst
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if log.IsLevelEnabled(logger.TraceLevel) {
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log.Tracef("%s >> %s %s %d %d",
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header.Src, header.Dst,
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xip.Protocol(waterutil.IPProtocol(header.NextHeader)),
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header.PayloadLen, header.TrafficClass)
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}
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} else {
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log.Warnf("unknown packet, discarded(%d)", n)
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return nil
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}
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var route *router.Route
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if r := registry.RouterRegistry().Get(rid); r != nil {
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route = r.GetRoute(ctx, dstIP, router.IDOption(rid))
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}
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if route == nil && h.md.router != nil {
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route = h.md.router.GetRoute(ctx, dstIP, router.IDOption(rid))
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}
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if route == nil || route.Gateway == "" {
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// no route to host, discard
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return nil
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}
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if log.IsLevelEnabled(logger.TraceLevel) {
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log.Tracef("route for %s: %s -> %s", dstIP, route.Dst, route.Gateway)
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}
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if c := h.pool.Get(routerID, route.Gateway); c != nil {
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if w := c.Writer(); w != nil {
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w.Write(b[:n])
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}
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}
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return nil
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}()
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if err != nil {
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if err == io.EOF {
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err = nil
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}
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return err
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}
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}
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}
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type packetConn struct {
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net.Conn
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}
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func (c *packetConn) Read(b []byte) (n int, err error) {
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var bb [2]byte
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_, err = io.ReadFull(c.Conn, bb[:])
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if err != nil {
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return
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}
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dlen := int(binary.BigEndian.Uint16(bb[:]))
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if len(b) >= dlen {
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return io.ReadFull(c.Conn, b[:dlen])
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}
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buf := bufpool.Get(dlen)
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defer bufpool.Put(buf)
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n, err = io.ReadFull(c.Conn, buf)
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copy(b, buf[:n])
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return
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}
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func (c *packetConn) Write(b []byte) (n int, err error) {
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if len(b) > math.MaxUint16 {
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err = errors.New("write: data maximum exceeded")
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return
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}
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buf := bufpool.Get(len(b) + 2)
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defer bufpool.Put(buf)
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binary.BigEndian.PutUint16(buf[:2], uint16(len(b)))
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n = copy(buf[2:], b)
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return c.Conn.Write(buf)
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}
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type lockWriter struct {
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w io.Writer
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mu sync.Mutex
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}
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func LockWriter(w io.Writer) io.Writer {
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return &lockWriter{w: w}
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}
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func (w *lockWriter) Write(p []byte) (int, error) {
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w.mu.Lock()
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defer w.mu.Unlock()
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return w.w.Write(p)
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}
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func (w *lockWriter) Close() error {
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if closer, ok := w.w.(io.Closer); ok {
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return closer.Close()
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}
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return nil
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}
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@@ -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 {
|
||||
events = evs
|
||||
}
|
||||
|
||||
case <-ctx.Done():
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,60 @@
|
||||
package router
|
||||
|
||||
import (
|
||||
"time"
|
||||
|
||||
"github.com/go-gost/core/ingress"
|
||||
mdata "github.com/go-gost/core/metadata"
|
||||
"github.com/go-gost/core/router"
|
||||
"github.com/go-gost/core/sd"
|
||||
mdutil "github.com/go-gost/x/metadata/util"
|
||||
"github.com/go-gost/x/registry"
|
||||
)
|
||||
|
||||
const (
|
||||
defaultTTL = 15 * time.Second
|
||||
defaultBufferSize = 1500
|
||||
)
|
||||
|
||||
type metadata struct {
|
||||
readTimeout time.Duration
|
||||
bufferSize int
|
||||
|
||||
entryPoint string
|
||||
ingress ingress.Ingress
|
||||
sd sd.SD
|
||||
router router.Router
|
||||
|
||||
observerPeriod time.Duration
|
||||
observerResetTraffic bool
|
||||
|
||||
limiterRefreshInterval time.Duration
|
||||
limiterCleanupInterval time.Duration
|
||||
}
|
||||
|
||||
func (h *routerHandler) parseMetadata(md mdata.Metadata) (err error) {
|
||||
h.md.readTimeout = mdutil.GetDuration(md, "readTimeout")
|
||||
h.md.bufferSize = mdutil.GetInt(md, "router.bufferSize", "bufferSize")
|
||||
if h.md.bufferSize <= 0 {
|
||||
h.md.bufferSize = defaultBufferSize
|
||||
}
|
||||
|
||||
h.md.entryPoint = mdutil.GetString(md, "entrypoint")
|
||||
h.md.ingress = registry.IngressRegistry().Get(mdutil.GetString(md, "ingress"))
|
||||
h.md.sd = registry.SDRegistry().Get(mdutil.GetString(md, "sd"))
|
||||
h.md.router = registry.RouterRegistry().Get(mdutil.GetString(md, "router"))
|
||||
|
||||
h.md.observerPeriod = mdutil.GetDuration(md, "observePeriod", "observer.period", "observer.observePeriod")
|
||||
if h.md.observerPeriod == 0 {
|
||||
h.md.observerPeriod = 5 * time.Second
|
||||
}
|
||||
if h.md.observerPeriod < time.Second {
|
||||
h.md.observerPeriod = time.Second
|
||||
}
|
||||
h.md.observerResetTraffic = mdutil.GetBool(md, "observer.resetTraffic")
|
||||
|
||||
h.md.limiterRefreshInterval = mdutil.GetDuration(md, "limiter.refreshInterval")
|
||||
h.md.limiterCleanupInterval = mdutil.GetDuration(md, "limiter.cleanupInterval")
|
||||
|
||||
return
|
||||
}
|
||||
@@ -0,0 +1,260 @@
|
||||
package router
|
||||
|
||||
import (
|
||||
"context"
|
||||
"io"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/go-gost/core/logger"
|
||||
"github.com/go-gost/relay"
|
||||
|
||||
"github.com/go-gost/x/selector"
|
||||
"github.com/google/uuid"
|
||||
)
|
||||
|
||||
const (
|
||||
MaxWeight uint8 = 0xff
|
||||
)
|
||||
|
||||
type ConnectorOptions struct{}
|
||||
|
||||
type Connector struct {
|
||||
id relay.ConnectorID
|
||||
rid relay.TunnelID
|
||||
host string
|
||||
w io.Writer
|
||||
opts *ConnectorOptions
|
||||
log logger.Logger
|
||||
}
|
||||
|
||||
func NewConnector(rid relay.TunnelID, cid relay.ConnectorID, host string, w io.Writer, opts *ConnectorOptions) *Connector {
|
||||
if opts == nil {
|
||||
opts = &ConnectorOptions{}
|
||||
}
|
||||
|
||||
c := &Connector{
|
||||
rid: rid,
|
||||
id: cid,
|
||||
host: host,
|
||||
w: w,
|
||||
opts: opts,
|
||||
log: logger.Default().WithFields(map[string]any{
|
||||
"router": rid.String(),
|
||||
"connector": cid.String(),
|
||||
"host": host,
|
||||
}),
|
||||
}
|
||||
|
||||
return c
|
||||
}
|
||||
|
||||
func (c *Connector) ID() relay.ConnectorID {
|
||||
return c.id
|
||||
}
|
||||
|
||||
func (c *Connector) Writer() io.Writer {
|
||||
if c == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
return c.w
|
||||
}
|
||||
|
||||
func (c *Connector) Close() error {
|
||||
if c == nil || c.w == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
if closer, ok := c.w.(io.Closer); ok {
|
||||
return closer.Close()
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
type Router struct {
|
||||
node string
|
||||
id relay.TunnelID
|
||||
connectors map[string][]*Connector
|
||||
t time.Time
|
||||
close chan struct{}
|
||||
mu sync.RWMutex
|
||||
}
|
||||
|
||||
func NewRouter(node string, rid relay.TunnelID) *Router {
|
||||
r := &Router{
|
||||
node: node,
|
||||
id: rid,
|
||||
connectors: make(map[string][]*Connector),
|
||||
t: time.Now(),
|
||||
close: make(chan struct{}),
|
||||
}
|
||||
return r
|
||||
}
|
||||
|
||||
func (r *Router) ID() relay.TunnelID {
|
||||
return r.id
|
||||
}
|
||||
|
||||
func (r *Router) AddConnector(c *Connector) {
|
||||
if c == nil {
|
||||
return
|
||||
}
|
||||
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
|
||||
r.connectors[c.host] = append(r.connectors[c.host], c)
|
||||
}
|
||||
|
||||
func (r *Router) GetConnector(host string) *Connector {
|
||||
r.mu.RLock()
|
||||
defer r.mu.RUnlock()
|
||||
|
||||
connectors := r.connectors[host]
|
||||
|
||||
if len(connectors) == 1 {
|
||||
return connectors[0]
|
||||
}
|
||||
|
||||
rw := selector.NewRandomWeighted[*Connector]()
|
||||
|
||||
found := false
|
||||
for _, c := range connectors {
|
||||
weight := c.ID().Weight()
|
||||
if weight == 0 {
|
||||
weight = 1
|
||||
}
|
||||
if weight == MaxWeight && !found {
|
||||
rw.Reset()
|
||||
found = true
|
||||
}
|
||||
|
||||
if weight == MaxWeight || !found {
|
||||
rw.Add(c, int(weight))
|
||||
}
|
||||
}
|
||||
|
||||
return rw.Next()
|
||||
}
|
||||
|
||||
func (r *Router) DelConnector(host string, cid relay.ConnectorID) {
|
||||
r.mu.RLock()
|
||||
defer r.mu.RUnlock()
|
||||
|
||||
connectors := r.connectors[host]
|
||||
for i, c := range connectors {
|
||||
if c.id.Equal(cid) {
|
||||
r.connectors[host] = append(connectors[:i], connectors[i+1:]...)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (r *Router) Close() error {
|
||||
r.mu.Lock()
|
||||
defer r.mu.Unlock()
|
||||
|
||||
select {
|
||||
case <-r.close:
|
||||
default:
|
||||
for _, cs := range r.connectors {
|
||||
for _, c := range cs {
|
||||
c.Close()
|
||||
}
|
||||
}
|
||||
close(r.close)
|
||||
|
||||
clear(r.connectors)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
type ConnectorPool struct {
|
||||
node string
|
||||
routers map[relay.TunnelID]*Router
|
||||
mu sync.RWMutex
|
||||
cancel context.CancelFunc
|
||||
}
|
||||
|
||||
func NewConnectorPool(node string) *ConnectorPool {
|
||||
p := &ConnectorPool{
|
||||
node: node,
|
||||
routers: make(map[relay.TunnelID]*Router),
|
||||
}
|
||||
|
||||
return p
|
||||
}
|
||||
|
||||
func (p *ConnectorPool) Add(rid relay.TunnelID, c *Connector) {
|
||||
p.mu.Lock()
|
||||
defer p.mu.Unlock()
|
||||
|
||||
r := p.routers[rid]
|
||||
if r == nil {
|
||||
r = NewRouter(p.node, rid)
|
||||
p.routers[rid] = r
|
||||
}
|
||||
r.AddConnector(c)
|
||||
}
|
||||
|
||||
func (p *ConnectorPool) Get(rid relay.TunnelID, host string) *Connector {
|
||||
if p == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
p.mu.RLock()
|
||||
defer p.mu.RUnlock()
|
||||
|
||||
r := p.routers[rid]
|
||||
if r == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
return r.GetConnector(host)
|
||||
}
|
||||
|
||||
func (p *ConnectorPool) Del(rid relay.TunnelID, host string, cid relay.ConnectorID) {
|
||||
if p == nil {
|
||||
return
|
||||
}
|
||||
|
||||
p.mu.RLock()
|
||||
defer p.mu.RUnlock()
|
||||
|
||||
r := p.routers[rid]
|
||||
if r == nil {
|
||||
return
|
||||
}
|
||||
|
||||
r.DelConnector(host, cid)
|
||||
}
|
||||
|
||||
func (p *ConnectorPool) Close() error {
|
||||
if p == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
if p.cancel != nil {
|
||||
p.cancel()
|
||||
}
|
||||
|
||||
p.mu.Lock()
|
||||
defer p.mu.Unlock()
|
||||
|
||||
for _, v := range p.routers {
|
||||
v.Close()
|
||||
}
|
||||
clear(p.routers)
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func parseRouterID(s string) (rid relay.TunnelID) {
|
||||
if s == "" {
|
||||
return
|
||||
}
|
||||
uuid, _ := uuid.Parse(s)
|
||||
|
||||
return relay.NewTunnelID(uuid[:])
|
||||
}
|
||||
Reference in New Issue
Block a user