remove default RTT implementation for non-Linux platforms and enhance keepalive period configuration for FreeBSD and Windows

pkg/interfaces/tcp_common.go

@@ -2,13 +2,3 @@
 // +build !linux
 
 package interfaces
-
-import (
-	"time"
-)
-
-// platformGetRTT is defined in OS-specific files
-// Default implementation for non-Linux platforms
-func platformGetRTT(fd uintptr) time.Duration {
-	return 0
-}

pkg/interfaces/tcp_freebsd.go

@@ -20,7 +20,12 @@ func (tc *TCPClientInterface) setTimeoutsLinux() error {
 		return fmt.Errorf("failed to enable keepalive: %v", err)
 	}
 
-	if err := tcpConn.SetKeepAlivePeriod(TCP_PROBE_INTERVAL * time.Second); err != nil {
+	keepalivePeriod := TCP_PROBE_INTERVAL_SEC * time.Second
+	if tc.i2pTunneled {
+		keepalivePeriod = I2P_PROBE_INTERVAL_SEC * time.Second
+	}
+	
+	if err := tcpConn.SetKeepAlivePeriod(keepalivePeriod); err != nil {
 		debug.Log(debug.DEBUG_VERBOSE, "Failed to set keepalive period", "error", err)
 	}
 

pkg/interfaces/tcp_linux.go

@@ -86,8 +86,8 @@ func platformGetRTT(fd uintptr) time.Duration {
 		fd,
 		syscall.IPPROTO_TCP,
 		11, // TCP_INFO
-		uintptr(unsafe.Pointer(&info)),
-		uintptr(unsafe.Pointer(&infoLen)),
+		uintptr(unsafe.Pointer(&info)),        //nolint:gosec
+		uintptr(unsafe.Pointer(&infoLen)),     //nolint:gosec
 		0,
 	)
 	

pkg/interfaces/tcp_windows.go

@@ -26,7 +26,12 @@ func (tc *TCPClientInterface) setTimeoutsWindows() error {
 		return fmt.Errorf("failed to enable keepalive: %v", err)
 	}
 
-	if err := tcpConn.SetKeepAlivePeriod(TCP_PROBE_INTERVAL); err != nil {
+	keepalivePeriod := TCP_PROBE_INTERVAL_SEC * time.Second
+	if tc.i2pTunneled {
+		keepalivePeriod = I2P_PROBE_INTERVAL_SEC * time.Second
+	}
+	
+	if err := tcpConn.SetKeepAlivePeriod(keepalivePeriod); err != nil {
 		debug.Log(debug.DEBUG_VERBOSE, "Failed to set keepalive period", "error", err)
 	}