From c2b833a2287190c871512974f5c33479df9724df Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= Date: Tue, 22 Oct 2024 21:28:22 +0800 Subject: [PATCH] Implement TCP and ICMP rejects --- adapter/router.go | 1 + constant/rule.go | 9 ++++-- inbound/tun.go | 12 ++++++-- option/rule_action.go | 24 +++++++++------ route/route.go | 62 +++++++++++++++++++++++++-------------- route/rule/rule_action.go | 26 ++++++++++++++-- 6 files changed, 94 insertions(+), 40 deletions(-) diff --git a/adapter/router.go b/adapter/router.go index 134c9442..c9cd46e9 100644 --- a/adapter/router.go +++ b/adapter/router.go @@ -34,6 +34,7 @@ type Router interface { FakeIPStore() FakeIPStore ConnectionRouter + PreMatch(metadata InboundContext) error ConnectionRouterEx GeoIPReader() *geoip.Reader diff --git a/constant/rule.go b/constant/rule.go index 02e03d8a..e662cd5c 100644 --- a/constant/rule.go +++ b/constant/rule.go @@ -33,7 +33,10 @@ const ( ) const ( - RuleActionRejectMethodDefault = "default" - RuleActionRejectMethodPortUnreachable = "port-unreachable" - RuleActionRejectMethodDrop = "drop" + RuleActionRejectMethodDefault = "default" + RuleActionRejectMethodReset = "reset" + RuleActionRejectMethodNetworkUnreachable = "network-unreachable" + RuleActionRejectMethodHostUnreachable = "host-unreachable" + RuleActionRejectMethodPortUnreachable = "port-unreachable" + RuleActionRejectMethodDrop = "drop" ) diff --git a/inbound/tun.go b/inbound/tun.go index 0d856419..f04ae71b 100644 --- a/inbound/tun.go +++ b/inbound/tun.go @@ -404,9 +404,15 @@ func (t *TUN) Close() error { ) } -func (t *TUN) PrepareConnection(source M.Socksaddr, destination M.Socksaddr) error { - // TODO: implement rejects - return nil +func (t *TUN) PrepareConnection(network string, source M.Socksaddr, destination M.Socksaddr) error { + return t.router.PreMatch(adapter.InboundContext{ + Inbound: t.tag, + InboundType: C.TypeTun, + Network: network, + Source: source, + Destination: destination, + InboundOptions: t.inboundOptions, + }) } func (t *TUN) NewConnectionEx(ctx context.Context, conn net.Conn, source M.Socksaddr, destination M.Socksaddr, onClose N.CloseHandlerFunc) { diff --git a/option/rule_action.go b/option/rule_action.go index 4f0ec177..f446d81d 100644 --- a/option/rule_action.go +++ b/option/rule_action.go @@ -136,23 +136,29 @@ type DNSRouteActionOptions struct { ClientSubnet *AddrPrefix `json:"client_subnet,omitempty"` } -type RejectActionOptions struct { - Method RejectMethod `json:"method,omitempty"` +type _RejectActionOptions struct { + Method string `json:"method,omitempty"` } -type RejectMethod string +type RejectActionOptions _RejectActionOptions -func (m *RejectMethod) UnmarshalJSON(bytes []byte) error { - err := json.Unmarshal(bytes, (*string)(m)) +func (r *RejectActionOptions) UnmarshalJSON(bytes []byte) error { + err := json.Unmarshal(bytes, (*_RejectActionOptions)(r)) if err != nil { return err } - switch *m { - case C.RuleActionRejectMethodDefault, C.RuleActionRejectMethodPortUnreachable, C.RuleActionRejectMethodDrop: - return nil + switch r.Method { + case "", C.RuleActionRejectMethodDefault: + r.Method = C.RuleActionRejectMethodDefault + case C.RuleActionRejectMethodReset, + C.RuleActionRejectMethodNetworkUnreachable, + C.RuleActionRejectMethodHostUnreachable, + C.RuleActionRejectMethodPortUnreachable, + C.RuleActionRejectMethodDrop: default: - return E.New("unknown reject method: " + *m) + return E.New("unknown reject method: " + r.Method) } + return nil } type RouteActionSniff struct { diff --git a/route/route.go b/route/route.go index 86d4d95c..cecd0f2a 100644 --- a/route/route.go +++ b/route/route.go @@ -21,7 +21,6 @@ import ( "github.com/sagernet/sing-box/route/rule" "github.com/sagernet/sing-dns" "github.com/sagernet/sing-mux" - "github.com/sagernet/sing-tun" "github.com/sagernet/sing-vmess" "github.com/sagernet/sing/common" "github.com/sagernet/sing/common/buf" @@ -89,7 +88,7 @@ func (r *Router) routeConnection(ctx context.Context, conn net.Conn, metadata ad if deadline.NeedAdditionalReadDeadline(conn) { conn = deadline.NewConn(conn) } - selectedRule, _, buffers, err := r.matchRule(ctx, &metadata, conn, nil, -1) + selectedRule, _, buffers, err := r.matchRule(ctx, &metadata, false, conn, nil, -1) if err != nil { return err } @@ -108,16 +107,7 @@ func (r *Router) routeConnection(ctx context.Context, conn net.Conn, metadata ad selectReturn = true case *rule.RuleActionReject: buf.ReleaseMulti(buffers) - var rejectErr error - switch action.Method { - case C.RuleActionRejectMethodDefault: - rejectErr = os.ErrClosed - case C.RuleActionRejectMethodPortUnreachable: - rejectErr = syscall.ECONNREFUSED - case C.RuleActionRejectMethodDrop: - rejectErr = tun.ErrDrop - } - N.CloseOnHandshakeFailure(conn, onClose, rejectErr) + N.CloseOnHandshakeFailure(conn, onClose, action.Error()) return nil } } @@ -236,7 +226,7 @@ func (r *Router) routePacketConnection(ctx context.Context, conn N.PacketConn, m conn = deadline.NewPacketConn(bufio.NewNetPacketConn(conn)) }*/ - selectedRule, _, buffers, err := r.matchRule(ctx, &metadata, nil, conn, -1) + selectedRule, _, buffers, err := r.matchRule(ctx, &metadata, false, nil, conn, -1) if err != nil { return err } @@ -306,8 +296,23 @@ func (r *Router) routePacketConnection(ctx context.Context, conn N.PacketConn, m return nil } +func (r *Router) PreMatch(metadata adapter.InboundContext) error { + selectedRule, _, _, err := r.matchRule(r.ctx, &metadata, true, nil, nil, -1) + if err != nil { + return err + } + if selectedRule == nil { + return nil + } + rejectAction, isReject := selectedRule.Action().(*rule.RuleActionReject) + if !isReject { + return nil + } + return rejectAction.Error() +} + func (r *Router) matchRule( - ctx context.Context, metadata *adapter.InboundContext, + ctx context.Context, metadata *adapter.InboundContext, preMatch bool, inputConn net.Conn, inputPacketConn N.PacketConn, ruleIndex int, ) (selectedRule adapter.Rule, selectedRuleIndex int, buffers []*buf.Buffer, fatalErr error) { if r.processSearcher != nil && metadata.ProcessInfo == nil { @@ -370,7 +375,7 @@ func (r *Router) matchRule( //nolint:staticcheck if metadata.InboundOptions != common.DefaultValue[option.InboundOptions]() { - if metadata.InboundOptions.SniffEnabled { + if !preMatch && metadata.InboundOptions.SniffEnabled { newBuffers, newErr := r.actionSniff(ctx, metadata, &rule.RuleActionSniff{ OverrideDestination: metadata.InboundOptions.SniffOverrideDestination, Timeout: time.Duration(metadata.InboundOptions.SniffTimeout), @@ -415,15 +420,28 @@ match: if !matched { break } - r.logger.DebugContext(ctx, "match[", currentRuleIndex, "] ", currentRule, " => ", currentRule.Action()) + if !preMatch { + r.logger.DebugContext(ctx, "match[", currentRuleIndex, "] ", currentRule, " => ", currentRule.Action()) + } else { + switch currentRule.Action().Type() { + case C.RuleActionTypeReject, C.RuleActionTypeResolve: + r.logger.DebugContext(ctx, "pre-match[", currentRuleIndex, "] ", currentRule, " => ", currentRule.Action()) + } + } switch action := currentRule.Action().(type) { case *rule.RuleActionSniff: - newBuffers, newErr := r.actionSniff(ctx, metadata, action, inputConn, inputPacketConn) - if newErr != nil { - fatalErr = newErr - return + if !preMatch { + newBuffers, newErr := r.actionSniff(ctx, metadata, action, inputConn, inputPacketConn) + if newErr != nil { + fatalErr = newErr + return + } + buffers = append(buffers, newBuffers...) + } else { + selectedRule = currentRule + selectedRuleIndex = currentRuleIndex + break match } - buffers = append(buffers, newBuffers...) case *rule.RuleActionResolve: fatalErr = r.actionResolve(ctx, metadata, action) if fatalErr != nil { @@ -436,7 +454,7 @@ match: } ruleIndex = currentRuleIndex } - if metadata.Destination.Addr.IsUnspecified() { + if !preMatch && metadata.Destination.Addr.IsUnspecified() { newBuffers, newErr := r.actionSniff(ctx, metadata, &rule.RuleActionSniff{}, inputConn, inputPacketConn) if newErr != nil { fatalErr = newErr diff --git a/route/rule/rule_action.go b/route/rule/rule_action.go index e85fc763..a157e94e 100644 --- a/route/rule/rule_action.go +++ b/route/rule/rule_action.go @@ -2,7 +2,9 @@ package rule import ( "net/netip" + "os" "strings" + "syscall" "time" "github.com/sagernet/sing-box/adapter" @@ -10,6 +12,7 @@ import ( C "github.com/sagernet/sing-box/constant" "github.com/sagernet/sing-box/option" "github.com/sagernet/sing-dns" + "github.com/sagernet/sing-tun" E "github.com/sagernet/sing/common/exceptions" F "github.com/sagernet/sing/common/format" ) @@ -22,10 +25,10 @@ func NewRuleAction(action option.RuleAction) (adapter.RuleAction, error) { UDPDisableDomainUnmapping: action.RouteOptions.UDPDisableDomainUnmapping, }, nil case C.RuleActionTypeReturn: - return &RuleActionReject{}, nil + return &RuleActionReturn{}, nil case C.RuleActionTypeReject: return &RuleActionReject{ - Method: string(action.RejectOptions.Method), + Method: action.RejectOptions.Method, }, nil case C.RuleActionTypeHijackDNS: return &RuleActionHijackDNS{}, nil @@ -58,7 +61,7 @@ func NewDNSRuleAction(action option.DNSRuleAction) adapter.RuleAction { return &RuleActionReturn{} case C.RuleActionTypeReject: return &RuleActionReject{ - Method: string(action.RejectOptions.Method), + Method: action.RejectOptions.Method, } default: panic(F.ToString("unknown rule action: ", action.Action)) @@ -118,6 +121,23 @@ func (r *RuleActionReject) String() string { return F.ToString("reject(", r.Method, ")") } +func (r *RuleActionReject) Error() error { + switch r.Method { + case C.RuleActionRejectMethodReset: + return os.ErrClosed + case C.RuleActionRejectMethodNetworkUnreachable: + return syscall.ENETUNREACH + case C.RuleActionRejectMethodHostUnreachable: + return syscall.EHOSTUNREACH + case C.RuleActionRejectMethodDefault, C.RuleActionRejectMethodPortUnreachable: + return syscall.ECONNREFUSED + case C.RuleActionRejectMethodDrop: + return tun.ErrDrop + default: + panic(F.ToString("unknown reject method: ", r.Method)) + } +} + type RuleActionHijackDNS struct{} func (r *RuleActionHijackDNS) Type() string {