close connection on restart inbound #684

Using new tracker

core/conntracker.go

@@ -7,6 +7,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/gofrs/uuid/v5"
 	"github.com/sagernet/sing-box/adapter"
 	"github.com/sagernet/sing/common/atomic"
 	"github.com/sagernet/sing/common/bufio"
@@ -18,20 +19,32 @@ type Counter struct {
 	write *atomic.Int64
 }
 
+type ConnectionInfo struct {
+	ID         string
+	Conn       net.Conn
+	PacketConn network.PacketConn
+	Inbound    string
+	User       string
+	CreatedAt  time.Time
+	Type       string // "tcp" or "udp"
+}
+
 type ConnTracker struct {
-	access    sync.Mutex
+	access      sync.Mutex
-	createdAt time.Time
+	createdAt   time.Time
-	inbounds  map[string]Counter
+	inbounds    map[string]Counter
-	outbounds map[string]Counter
+	outbounds   map[string]Counter
-	users     map[string]Counter
+	users       map[string]Counter
+	connections map[string]*ConnectionInfo
 }
 
 func NewConnTracker() *ConnTracker {
 	return &ConnTracker{
-		createdAt: time.Now(),
+		createdAt:   time.Now(),
-		inbounds:  make(map[string]Counter),
+		inbounds:    make(map[string]Counter),
-		outbounds: make(map[string]Counter),
+		outbounds:   make(map[string]Counter),
-		users:     make(map[string]Counter),
+		users:       make(map[string]Counter),
+		connections: make(map[string]*ConnectionInfo),
 	}
 }
 
@@ -65,14 +78,114 @@ func (c *ConnTracker) loadOrCreateCounter(obj *map[string]Counter, name string)
 	return counter
 }
 
+func (c *ConnTracker) generateConnectionID() string {
+	return uuid.Must(uuid.NewV4()).String()
+}
+
+func (c *ConnTracker) trackConnection(connID string, connInfo *ConnectionInfo) {
+	c.access.Lock()
+	defer c.access.Unlock()
+	c.connections[connID] = connInfo
+}
+
+func (c *ConnTracker) untrackConnection(connID string) {
+	c.access.Lock()
+	defer c.access.Unlock()
+	delete(c.connections, connID)
+}
+
+func (c *ConnTracker) createWrappedConn(conn net.Conn, connID string) net.Conn {
+	return &wrappedConn{
+		Conn:    conn,
+		tracker: c,
+		connID:  connID,
+	}
+}
+
+func (c *ConnTracker) createWrappedPacketConn(conn network.PacketConn, connID string) network.PacketConn {
+	return &wrappedPacketConn{
+		PacketConn: conn,
+		tracker:    c,
+		connID:     connID,
+	}
+}
+
 func (c *ConnTracker) RoutedConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext, matchedRule adapter.Rule, matchOutbound adapter.Outbound) net.Conn {
 	readCounter, writeCounter := c.getReadCounters(metadata.Inbound, matchOutbound.Tag(), metadata.User)
-	return bufio.NewInt64CounterConn(conn, readCounter, writeCounter)
+
+	connID := c.generateConnectionID()
+	connInfo := &ConnectionInfo{
+		ID:        connID,
+		Conn:      conn,
+		Inbound:   metadata.Inbound,
+		User:      metadata.User,
+		CreatedAt: time.Now(),
+		Type:      "tcp",
+	}
+
+	c.trackConnection(connID, connInfo)
+
+	wrappedConn := c.createWrappedConn(conn, connID)
+	return bufio.NewInt64CounterConn(wrappedConn, readCounter, writeCounter)
 }
 
 func (c *ConnTracker) RoutedPacketConnection(ctx context.Context, conn network.PacketConn, metadata adapter.InboundContext, matchedRule adapter.Rule, matchOutbound adapter.Outbound) network.PacketConn {
 	readCounter, writeCounter := c.getReadCounters(metadata.Inbound, matchOutbound.Tag(), metadata.User)
-	return bufio.NewInt64CounterPacketConn(conn, readCounter, writeCounter)
+
+	connID := c.generateConnectionID()
+	connInfo := &ConnectionInfo{
+		ID:         connID,
+		PacketConn: conn,
+		Inbound:    metadata.Inbound,
+		User:       metadata.User,
+		CreatedAt:  time.Now(),
+		Type:       "udp",
+	}
+
+	c.trackConnection(connID, connInfo)
+
+	wrappedConn := c.createWrappedPacketConn(conn, connID)
+	return bufio.NewInt64CounterPacketConn(wrappedConn, readCounter, writeCounter)
+}
+
+func (c *ConnTracker) ForceCloseConn(inbound, user string) int {
+	c.access.Lock()
+	defer c.access.Unlock()
+
+	closedCount := 0
+	for connID, connInfo := range c.connections {
+		if connInfo.Inbound == inbound && connInfo.User == user {
+			if connInfo.Conn != nil {
+				connInfo.Conn.Close()
+			}
+			if connInfo.PacketConn != nil {
+				connInfo.PacketConn.Close()
+			}
+			delete(c.connections, connID)
+			closedCount++
+		}
+	}
+	return closedCount
+}
+
+func (c *ConnTracker) CloseConnByInbound(inbound string) int {
+	c.access.Lock()
+	defer c.access.Unlock()
+
+	closedCount := 0
+	for connID, connInfo := range c.connections {
+		if connInfo.Inbound == inbound {
+			if connInfo.Conn != nil {
+				connInfo.Conn.Close()
+			}
+			if connInfo.PacketConn != nil {
+				connInfo.PacketConn.Close()
+			}
+			delete(c.connections, connID)
+			closedCount++
+		}
+	}
+	return closedCount
 }
 
 func (c *ConnTracker) GetStats() *[]model.Stats {

core/wrapped_conn.go

@@ -0,0 +1,29 @@
+package core
+
+import (
+	"net"
+
+	"github.com/sagernet/sing/common/network"
+)
+
+type wrappedConn struct {
+	net.Conn
+	tracker *ConnTracker
+	connID  string
+}
+
+func (w *wrappedConn) Close() error {
+	w.tracker.untrackConnection(w.connID)
+	return w.Conn.Close()
+}
+
+type wrappedPacketConn struct {
+	network.PacketConn
+	tracker *ConnTracker
+	connID  string
+}
+
+func (w *wrappedPacketConn) Close() error {
+	w.tracker.untrackConnection(w.connID)
+	return w.PacketConn.Close()
+}

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/gin-contrib/gzip v1.2.3
 	github.com/gin-contrib/sessions v1.0.4
 	github.com/gin-gonic/gin v1.10.1
+	github.com/google/uuid v1.6.0
 	github.com/op/go-logging v0.0.0-20160315200505-970db520ece7
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/sagernet/sing v0.7.0-beta.1.0.20250722151551-64142925accb
@@ -58,7 +59,6 @@ require (
 	github.com/google/btree v1.1.3 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806 // indirect
-	github.com/google/uuid v1.6.0 // indirect
 	github.com/gorilla/context v1.1.2 // indirect
 	github.com/gorilla/csrf v1.7.3-0.20250123201450-9dd6af1f6d30 // indirect
 	github.com/gorilla/securecookie v1.1.2 // indirect

service/inbounds.go

@@ -341,6 +341,9 @@ func (s *InboundService) RestartInbounds(tx *gorm.DB, ids []uint) error {
 		if err != nil && err != os.ErrInvalid {
 			return err
 		}
+		// Close all existing connections
+		corePtr.GetInstance().ConnTracker().CloseConnByInbound(inbound.Tag)
+
 		inboundConfig, err := inbound.MarshalJSON()
 		if err != nil {
 			return err