feat: configurable TCPKeepAlive interval

listener/tproxy/tproxy.go

@@ -4,6 +4,7 @@ import (
 	"net"
 
 	"github.com/Dreamacro/clash/adapter/inbound"
+	N "github.com/Dreamacro/clash/common/net"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/transport/socks5"
 )
@@ -32,7 +33,7 @@ func (l *Listener) Close() error {
 
 func (l *Listener) handleTProxy(conn net.Conn, in chan<- C.ConnContext, additions ...inbound.Addition) {
 	target := socks5.ParseAddrToSocksAddr(conn.LocalAddr())
-	conn.(*net.TCPConn).SetKeepAlive(true)
+	N.TCPKeepAlive(conn)
 	in <- inbound.NewSocket(target, conn, C.TPROXY, additions...)
 }