feat: add platform-specific TCP timeout configurations for Darwin, FreeBSD, Windows, and Linux

pkg/interfaces/tcp_darwin.go

@@ -0,0 +1,64 @@
+// +build darwin
+
+package interfaces
+
+import (
+	"fmt"
+	"net"
+	"syscall"
+	"time"
+
+	"github.com/Sudo-Ivan/reticulum-go/pkg/debug"
+)
+
+func (tc *TCPClientInterface) setTimeoutsLinux() error {
+	return tc.setTimeoutsOSX()
+}
+
+func (tc *TCPClientInterface) setTimeoutsOSX() error {
+	tcpConn, ok := tc.conn.(*net.TCPConn)
+	if !ok {
+		return fmt.Errorf("not a TCP connection")
+	}
+
+	rawConn, err := tcpConn.SyscallConn()
+	if err != nil {
+		return fmt.Errorf("failed to get raw connection: %v", err)
+	}
+
+	var sockoptErr error
+	err = rawConn.Control(func(fd uintptr) {
+		const TCP_KEEPALIVE = 0x10
+		
+		var probeAfter int
+		if tc.i2pTunneled {
+			probeAfter = I2P_PROBE_AFTER_SEC
+		} else {
+			probeAfter = TCP_PROBE_AFTER_SEC
+		}
+		
+		if err := syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, 1); err != nil {
+			sockoptErr = fmt.Errorf("failed to enable SO_KEEPALIVE: %v", err)
+			return
+		}
+		
+		if err := syscall.SetsockoptInt(int(fd), syscall.IPPROTO_TCP, TCP_KEEPALIVE, probeAfter); err != nil {
+			debug.Log(debug.DEBUG_VERBOSE, "Failed to set TCP_KEEPALIVE", "error", err)
+		}
+	})
+
+	if err != nil {
+		return fmt.Errorf("control failed: %v", err)
+	}
+	if sockoptErr != nil {
+		return sockoptErr
+	}
+
+	debug.Log(debug.DEBUG_VERBOSE, "TCP keepalive configured (OSX)", "i2p", tc.i2pTunneled)
+	return nil
+}
+
+func platformGetRTT(fd uintptr) time.Duration {
+	return 0
+}
+