mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-12-26 16:45:43 +08:00
584 lines
19 KiB
Go
584 lines
19 KiB
Go
package route
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import (
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"context"
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"errors"
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"net"
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"net/netip"
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"os"
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"os/user"
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"strings"
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"syscall"
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"time"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/conntrack"
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"github.com/sagernet/sing-box/common/process"
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"github.com/sagernet/sing-box/common/sniff"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing-box/outbound"
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"github.com/sagernet/sing-box/route/rule"
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"github.com/sagernet/sing-dns"
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"github.com/sagernet/sing-mux"
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"github.com/sagernet/sing-tun"
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"github.com/sagernet/sing-vmess"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/buf"
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"github.com/sagernet/sing/common/bufio"
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"github.com/sagernet/sing/common/bufio/deadline"
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E "github.com/sagernet/sing/common/exceptions"
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F "github.com/sagernet/sing/common/format"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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"github.com/sagernet/sing/common/uot"
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)
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// Deprecated: use RouteConnectionEx instead.
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func (r *Router) RouteConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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return r.routeConnection(ctx, conn, metadata, nil)
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}
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func (r *Router) RouteConnectionEx(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
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err := r.routeConnection(ctx, conn, metadata, onClose)
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if err != nil {
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N.CloseOnHandshakeFailure(conn, onClose, err)
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if E.IsClosedOrCanceled(err) {
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r.logger.DebugContext(ctx, "connection closed: ", err)
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} else {
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r.logger.ErrorContext(ctx, err)
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}
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}
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}
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func (r *Router) routeConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) error {
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if r.pauseManager.IsDevicePaused() {
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return E.New("reject connection to ", metadata.Destination, " while device paused")
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}
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if metadata.InboundDetour != "" {
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if metadata.LastInbound == metadata.InboundDetour {
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return E.New("routing loop on detour: ", metadata.InboundDetour)
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}
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detour := r.inboundByTag[metadata.InboundDetour]
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if detour == nil {
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return E.New("inbound detour not found: ", metadata.InboundDetour)
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}
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injectable, isInjectable := detour.(adapter.TCPInjectableInbound)
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if !isInjectable {
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return E.New("inbound detour is not TCP injectable: ", metadata.InboundDetour)
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}
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metadata.LastInbound = metadata.Inbound
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metadata.Inbound = metadata.InboundDetour
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metadata.InboundDetour = ""
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injectable.NewConnectionEx(ctx, conn, metadata, onClose)
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return nil
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}
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conntrack.KillerCheck()
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metadata.Network = N.NetworkTCP
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switch metadata.Destination.Fqdn {
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case mux.Destination.Fqdn:
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return E.New("global multiplex is deprecated since sing-box v1.7.0, enable multiplex in inbound options instead.")
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case vmess.MuxDestination.Fqdn:
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return E.New("global multiplex (v2ray legacy) not supported since sing-box v1.7.0.")
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case uot.MagicAddress:
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return E.New("global UoT not supported since sing-box v1.7.0.")
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case uot.LegacyMagicAddress:
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return E.New("global UoT (legacy) not supported since sing-box v1.7.0.")
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}
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if deadline.NeedAdditionalReadDeadline(conn) {
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conn = deadline.NewConn(conn)
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}
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selectedRule, _, buffers, err := r.matchRule(ctx, &metadata, conn, nil, -1)
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if err != nil {
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return err
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}
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var selectedOutbound adapter.Outbound
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var selectReturn bool
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if selectedRule != nil {
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switch action := selectedRule.Action().(type) {
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case *rule.RuleActionRoute:
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var loaded bool
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selectedOutbound, loaded = r.Outbound(action.Outbound)
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if !loaded {
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buf.ReleaseMulti(buffers)
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return E.New("outbound not found: ", action.Outbound)
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}
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case *rule.RuleActionReturn:
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selectReturn = true
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case *rule.RuleActionReject:
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buf.ReleaseMulti(buffers)
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var rejectErr error
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switch action.Method {
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case C.RuleActionRejectMethodDefault:
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rejectErr = os.ErrClosed
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case C.RuleActionRejectMethodPortUnreachable:
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rejectErr = syscall.ECONNREFUSED
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case C.RuleActionRejectMethodDrop:
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rejectErr = tun.ErrDrop
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}
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N.CloseOnHandshakeFailure(conn, onClose, rejectErr)
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return nil
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}
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}
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if selectedRule == nil || selectReturn {
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if r.defaultOutboundForConnection == nil {
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buf.ReleaseMulti(buffers)
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return E.New("missing default outbound with TCP support")
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}
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selectedOutbound = r.defaultOutboundForConnection
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}
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if !common.Contains(selectedOutbound.Network(), N.NetworkTCP) {
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buf.ReleaseMulti(buffers)
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return E.New("TCP is not supported by outbound: ", selectedOutbound.Tag())
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}
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for _, buffer := range buffers {
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conn = bufio.NewCachedConn(conn, buffer)
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}
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if r.clashServer != nil {
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trackerConn, tracker := r.clashServer.RoutedConnection(ctx, conn, metadata, selectedRule)
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defer tracker.Leave()
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conn = trackerConn
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}
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if r.v2rayServer != nil {
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if statsService := r.v2rayServer.StatsService(); statsService != nil {
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conn = statsService.RoutedConnection(metadata.Inbound, selectedOutbound.Tag(), metadata.User, conn)
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}
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}
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legacyOutbound, isLegacy := selectedOutbound.(adapter.ConnectionHandler)
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if isLegacy {
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err = legacyOutbound.NewConnection(ctx, conn, metadata)
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if err != nil {
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conn.Close()
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if onClose != nil {
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onClose(err)
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}
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return E.Cause(err, "outbound/", selectedOutbound.Type(), "[", selectedOutbound.Tag(), "]")
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} else {
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if onClose != nil {
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onClose(nil)
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}
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}
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return nil
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}
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// TODO
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err = outbound.NewConnection(ctx, selectedOutbound, conn, metadata)
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if err != nil {
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conn.Close()
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if onClose != nil {
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onClose(err)
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}
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return E.Cause(err, "outbound/", selectedOutbound.Type(), "[", selectedOutbound.Tag(), "]")
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} else {
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if onClose != nil {
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onClose(nil)
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}
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}
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return nil
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}
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func (r *Router) RoutePacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
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err := r.routePacketConnection(ctx, conn, metadata, nil)
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if err != nil {
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conn.Close()
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if E.IsClosedOrCanceled(err) {
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r.logger.DebugContext(ctx, "connection closed: ", err)
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} else {
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r.logger.ErrorContext(ctx, err)
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}
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}
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return nil
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}
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func (r *Router) RoutePacketConnectionEx(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
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err := r.routePacketConnection(ctx, conn, metadata, onClose)
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if err != nil {
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N.CloseOnHandshakeFailure(conn, onClose, err)
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if E.IsClosedOrCanceled(err) {
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r.logger.DebugContext(ctx, "connection closed: ", err)
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} else {
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r.logger.ErrorContext(ctx, err)
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}
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} else if onClose != nil {
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onClose(nil)
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}
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}
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func (r *Router) routePacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) error {
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if r.pauseManager.IsDevicePaused() {
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return E.New("reject packet connection to ", metadata.Destination, " while device paused")
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}
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if metadata.InboundDetour != "" {
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if metadata.LastInbound == metadata.InboundDetour {
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return E.New("routing loop on detour: ", metadata.InboundDetour)
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}
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detour := r.inboundByTag[metadata.InboundDetour]
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if detour == nil {
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return E.New("inbound detour not found: ", metadata.InboundDetour)
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}
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injectable, isInjectable := detour.(adapter.UDPInjectableInbound)
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if !isInjectable {
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return E.New("inbound detour is not UDP injectable: ", metadata.InboundDetour)
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}
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metadata.LastInbound = metadata.Inbound
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metadata.Inbound = metadata.InboundDetour
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metadata.InboundDetour = ""
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injectable.NewPacketConnectionEx(ctx, conn, metadata, onClose)
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return nil
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}
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conntrack.KillerCheck()
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// TODO: move to UoT
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metadata.Network = N.NetworkUDP
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// Currently we don't have deadline usages for UDP connections
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/*if deadline.NeedAdditionalReadDeadline(conn) {
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conn = deadline.NewPacketConn(bufio.NewNetPacketConn(conn))
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}*/
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selectedRule, _, buffers, err := r.matchRule(ctx, &metadata, nil, conn, -1)
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if err != nil {
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return err
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}
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var selectedOutbound adapter.Outbound
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var selectReturn bool
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if selectedRule != nil {
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switch action := selectedRule.Action().(type) {
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case *rule.RuleActionRoute:
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var loaded bool
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selectedOutbound, loaded = r.Outbound(action.Outbound)
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if !loaded {
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buf.ReleaseMulti(buffers)
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return E.New("outbound not found: ", action.Outbound)
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}
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metadata.UDPDisableDomainUnmapping = action.UDPDisableDomainUnmapping
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case *rule.RuleActionReturn:
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selectReturn = true
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case *rule.RuleActionReject:
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buf.ReleaseMulti(buffers)
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N.CloseOnHandshakeFailure(conn, onClose, syscall.ECONNREFUSED)
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return nil
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}
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}
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if selectedRule == nil || selectReturn {
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if r.defaultOutboundForPacketConnection == nil {
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buf.ReleaseMulti(buffers)
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return E.New("missing default outbound with UDP support")
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}
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selectedOutbound = r.defaultOutboundForPacketConnection
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}
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if !common.Contains(selectedOutbound.Network(), N.NetworkUDP) {
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buf.ReleaseMulti(buffers)
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return E.New("UDP is not supported by outbound: ", selectedOutbound.Tag())
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}
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for _, buffer := range buffers {
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// TODO: check if metadata.Destination == packet destination
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conn = bufio.NewCachedPacketConn(conn, buffer, metadata.Destination)
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}
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if r.clashServer != nil {
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trackerConn, tracker := r.clashServer.RoutedPacketConnection(ctx, conn, metadata, selectedRule)
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defer tracker.Leave()
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conn = trackerConn
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}
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if r.v2rayServer != nil {
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if statsService := r.v2rayServer.StatsService(); statsService != nil {
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conn = statsService.RoutedPacketConnection(metadata.Inbound, selectedOutbound.Tag(), metadata.User, conn)
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}
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}
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if metadata.FakeIP {
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conn = bufio.NewNATPacketConn(bufio.NewNetPacketConn(conn), metadata.OriginDestination, metadata.Destination)
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}
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legacyOutbound, isLegacy := selectedOutbound.(adapter.PacketConnectionHandler)
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if isLegacy {
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err = legacyOutbound.NewPacketConnection(ctx, conn, metadata)
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N.CloseOnHandshakeFailure(conn, onClose, err)
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if err != nil {
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return E.Cause(err, "outbound/", selectedOutbound.Type(), "[", selectedOutbound.Tag(), "]")
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}
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return nil
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}
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// TODO
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err = outbound.NewPacketConnection(ctx, selectedOutbound, conn, metadata)
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N.CloseOnHandshakeFailure(conn, onClose, err)
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if err != nil {
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return E.Cause(err, "outbound/", selectedOutbound.Type(), "[", selectedOutbound.Tag(), "]")
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}
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return nil
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}
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func (r *Router) matchRule(
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ctx context.Context, metadata *adapter.InboundContext,
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inputConn net.Conn, inputPacketConn N.PacketConn, ruleIndex int,
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) (selectedRule adapter.Rule, selectedRuleIndex int, buffers []*buf.Buffer, fatalErr error) {
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if r.processSearcher != nil && metadata.ProcessInfo == nil {
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var originDestination netip.AddrPort
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if metadata.OriginDestination.IsValid() {
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originDestination = metadata.OriginDestination.AddrPort()
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} else if metadata.Destination.IsIP() {
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originDestination = metadata.Destination.AddrPort()
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}
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processInfo, fErr := process.FindProcessInfo(r.processSearcher, ctx, metadata.Network, metadata.Source.AddrPort(), originDestination)
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if fErr != nil {
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r.logger.InfoContext(ctx, "failed to search process: ", fErr)
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} else {
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if processInfo.ProcessPath != "" {
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r.logger.InfoContext(ctx, "found process path: ", processInfo.ProcessPath)
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} else if processInfo.PackageName != "" {
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r.logger.InfoContext(ctx, "found package name: ", processInfo.PackageName)
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} else if processInfo.UserId != -1 {
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if /*needUserName &&*/ true {
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osUser, _ := user.LookupId(F.ToString(processInfo.UserId))
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if osUser != nil {
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processInfo.User = osUser.Username
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}
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}
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if processInfo.User != "" {
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r.logger.InfoContext(ctx, "found user: ", processInfo.User)
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} else {
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r.logger.InfoContext(ctx, "found user id: ", processInfo.UserId)
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}
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}
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metadata.ProcessInfo = processInfo
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}
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}
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if r.fakeIPStore != nil && r.fakeIPStore.Contains(metadata.Destination.Addr) {
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domain, loaded := r.fakeIPStore.Lookup(metadata.Destination.Addr)
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if !loaded {
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fatalErr = E.New("missing fakeip record, try to configure experimental.cache_file")
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return
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}
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metadata.OriginDestination = metadata.Destination
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metadata.Destination = M.Socksaddr{
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Fqdn: domain,
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Port: metadata.Destination.Port,
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}
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metadata.FakeIP = true
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r.logger.DebugContext(ctx, "found fakeip domain: ", domain)
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}
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if r.dnsReverseMapping != nil && metadata.Domain == "" {
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domain, loaded := r.dnsReverseMapping.Query(metadata.Destination.Addr)
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if loaded {
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metadata.Domain = domain
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r.logger.DebugContext(ctx, "found reserve mapped domain: ", metadata.Domain)
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}
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}
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if metadata.Destination.IsIPv4() {
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metadata.IPVersion = 4
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} else if metadata.Destination.IsIPv6() {
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metadata.IPVersion = 6
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}
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//nolint:staticcheck
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if metadata.InboundOptions != common.DefaultValue[option.InboundOptions]() {
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if metadata.InboundOptions.SniffEnabled {
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newBuffers, newErr := r.actionSniff(ctx, metadata, &rule.RuleActionSniff{
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OverrideDestination: metadata.InboundOptions.SniffOverrideDestination,
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Timeout: time.Duration(metadata.InboundOptions.SniffTimeout),
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}, inputConn, inputPacketConn)
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if newErr != nil {
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fatalErr = newErr
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return
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}
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buffers = append(buffers, newBuffers...)
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}
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if dns.DomainStrategy(metadata.InboundOptions.DomainStrategy) != dns.DomainStrategyAsIS {
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fatalErr = r.actionResolve(ctx, metadata, &rule.RuleActionResolve{
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Strategy: dns.DomainStrategy(metadata.InboundOptions.DomainStrategy),
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})
|
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if fatalErr != nil {
|
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return
|
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}
|
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}
|
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if metadata.InboundOptions.UDPDisableDomainUnmapping {
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metadata.UDPDisableDomainUnmapping = true
|
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}
|
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metadata.InboundOptions = option.InboundOptions{}
|
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}
|
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|
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match:
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for ruleIndex < len(r.rules) {
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rules := r.rules
|
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if ruleIndex != -1 {
|
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rules = rules[ruleIndex+1:]
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}
|
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var (
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currentRule adapter.Rule
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currentRuleIndex int
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matched bool
|
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)
|
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for currentRuleIndex, currentRule = range rules {
|
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if currentRule.Match(metadata) {
|
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matched = true
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break
|
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}
|
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}
|
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if !matched {
|
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break
|
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}
|
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r.logger.DebugContext(ctx, "match[", currentRuleIndex, "] ", currentRule, " => ", currentRule.Action())
|
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switch action := currentRule.Action().(type) {
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case *rule.RuleActionSniff:
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newBuffers, newErr := r.actionSniff(ctx, metadata, action, inputConn, inputPacketConn)
|
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if newErr != nil {
|
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fatalErr = newErr
|
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return
|
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}
|
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buffers = append(buffers, newBuffers...)
|
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case *rule.RuleActionResolve:
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fatalErr = r.actionResolve(ctx, metadata, action)
|
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if fatalErr != nil {
|
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return
|
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}
|
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default:
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selectedRule = currentRule
|
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selectedRuleIndex = currentRuleIndex
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break match
|
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}
|
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ruleIndex = currentRuleIndex
|
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}
|
|
if metadata.Destination.Addr.IsUnspecified() {
|
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newBuffers, newErr := r.actionSniff(ctx, metadata, &rule.RuleActionSniff{}, inputConn, inputPacketConn)
|
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if newErr != nil {
|
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fatalErr = newErr
|
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return
|
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}
|
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buffers = append(buffers, newBuffers...)
|
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}
|
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return
|
|
}
|
|
|
|
func (r *Router) actionSniff(
|
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ctx context.Context, metadata *adapter.InboundContext, action *rule.RuleActionSniff,
|
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inputConn net.Conn, inputPacketConn N.PacketConn,
|
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) (buffers []*buf.Buffer, fatalErr error) {
|
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if sniff.Skip(metadata) {
|
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return
|
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} else if inputConn != nil && len(action.StreamSniffers) > 0 {
|
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buffer := buf.NewPacket()
|
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err := sniff.PeekStream(
|
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ctx,
|
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metadata,
|
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inputConn,
|
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buffer,
|
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action.Timeout,
|
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action.StreamSniffers...,
|
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)
|
|
if err == nil {
|
|
//goland:noinspection GoDeprecation
|
|
if action.OverrideDestination && M.IsDomainName(metadata.Domain) {
|
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metadata.Destination = M.Socksaddr{
|
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Fqdn: metadata.Domain,
|
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Port: metadata.Destination.Port,
|
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}
|
|
}
|
|
if metadata.Domain != "" && metadata.Client != "" {
|
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r.logger.DebugContext(ctx, "sniffed protocol: ", metadata.Protocol, ", domain: ", metadata.Domain, ", client: ", metadata.Client)
|
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} else if metadata.Domain != "" {
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r.logger.DebugContext(ctx, "sniffed protocol: ", metadata.Protocol, ", domain: ", metadata.Domain)
|
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} else {
|
|
r.logger.DebugContext(ctx, "sniffed protocol: ", metadata.Protocol)
|
|
}
|
|
}
|
|
if !buffer.IsEmpty() {
|
|
buffers = append(buffers, buffer)
|
|
} else {
|
|
buffer.Release()
|
|
}
|
|
} else if inputPacketConn != nil && len(action.PacketSniffers) > 0 {
|
|
for {
|
|
var (
|
|
buffer = buf.NewPacket()
|
|
destination M.Socksaddr
|
|
done = make(chan struct{})
|
|
err error
|
|
)
|
|
go func() {
|
|
sniffTimeout := C.ReadPayloadTimeout
|
|
if action.Timeout > 0 {
|
|
sniffTimeout = action.Timeout
|
|
}
|
|
inputPacketConn.SetReadDeadline(time.Now().Add(sniffTimeout))
|
|
destination, err = inputPacketConn.ReadPacket(buffer)
|
|
inputPacketConn.SetReadDeadline(time.Time{})
|
|
close(done)
|
|
}()
|
|
select {
|
|
case <-done:
|
|
case <-ctx.Done():
|
|
inputPacketConn.Close()
|
|
fatalErr = ctx.Err()
|
|
return
|
|
}
|
|
if err != nil {
|
|
buffer.Release()
|
|
if !errors.Is(err, os.ErrDeadlineExceeded) {
|
|
fatalErr = err
|
|
return
|
|
}
|
|
} else {
|
|
// TODO: maybe always override destination
|
|
if metadata.Destination.Addr.IsUnspecified() {
|
|
metadata.Destination = destination
|
|
}
|
|
if len(buffers) > 0 {
|
|
err = sniff.PeekPacket(
|
|
ctx,
|
|
metadata,
|
|
buffer.Bytes(),
|
|
sniff.QUICClientHello,
|
|
)
|
|
} else {
|
|
err = sniff.PeekPacket(
|
|
ctx, metadata,
|
|
buffer.Bytes(),
|
|
action.PacketSniffers...,
|
|
)
|
|
}
|
|
buffers = append(buffers, buffer)
|
|
if E.IsMulti(err, sniff.ErrClientHelloFragmented) && len(buffers) == 0 {
|
|
r.logger.DebugContext(ctx, "attempt to sniff fragmented QUIC client hello")
|
|
continue
|
|
}
|
|
if metadata.Protocol != "" {
|
|
//goland:noinspection GoDeprecation
|
|
if action.OverrideDestination && M.IsDomainName(metadata.Domain) {
|
|
metadata.Destination = M.Socksaddr{
|
|
Fqdn: metadata.Domain,
|
|
Port: metadata.Destination.Port,
|
|
}
|
|
}
|
|
if metadata.Domain != "" && metadata.Client != "" {
|
|
r.logger.DebugContext(ctx, "sniffed packet protocol: ", metadata.Protocol, ", domain: ", metadata.Domain, ", client: ", metadata.Client)
|
|
} else if metadata.Domain != "" {
|
|
r.logger.DebugContext(ctx, "sniffed packet protocol: ", metadata.Protocol, ", domain: ", metadata.Domain)
|
|
} else if metadata.Client != "" {
|
|
r.logger.DebugContext(ctx, "sniffed packet protocol: ", metadata.Protocol, ", client: ", metadata.Client)
|
|
} else {
|
|
r.logger.DebugContext(ctx, "sniffed packet protocol: ", metadata.Protocol)
|
|
}
|
|
}
|
|
}
|
|
break
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (r *Router) actionResolve(ctx context.Context, metadata *adapter.InboundContext, action *rule.RuleActionResolve) error {
|
|
if metadata.Destination.IsFqdn() {
|
|
// TODO: check if WithContext is necessary
|
|
addresses, err := r.Lookup(adapter.WithContext(ctx, metadata), metadata.Destination.Fqdn, action.Strategy)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
metadata.DestinationAddresses = addresses
|
|
r.dnsLogger.DebugContext(ctx, "resolved [", strings.Join(F.MapToString(metadata.DestinationAddresses), " "), "]")
|
|
if metadata.Destination.IsIPv4() {
|
|
metadata.IPVersion = 4
|
|
} else if metadata.Destination.IsIPv6() {
|
|
metadata.IPVersion = 6
|
|
}
|
|
}
|
|
return nil
|
|
}
|