golang minifilter详细实现-Go服务器开发

Golang的Minifilter实现可以使用WinAPI中提供的Minifilter API来完成。下面是一个简单的示例代码，可以帮助你了解如何实现：

package main

import (
    "fmt"
    "os"
    "syscall"
)

const (
    // FilterAltitude is the altitude of the filter.
    FilterAltitude = FLT_ALTITUDE_FILE_SYSTEM_MIN + 1000

    // FilterName is the name of the filter.
    FilterName = "MyFilter"

    // PoolTag is a tag used by the memory pool.
    PoolTag = ' tni'
)

var (
    // FltMgrInstance is the handle to the minifilter driver instance.
    FltMgrInstance syscall.Handle
)

// MyFltCallback is the callback function that will be called for each I/O operation on files.
func MyFltCallback(
        context *FLT_RELATED_OBJECTS,
        operation uint32,
        inputBuffer []byte,
        inputOffset uint64,
        inputDataLength uint32,
        outputBuffer []byte,
        outputOffset uint64,
        outputDataLength *uint32) (status uint32, flags uint32) {

    fmt.Printf("MyFltCallback - context=%+v, operation=%d\n", context, operation)
    
    return FLT_PREOP_SUCCESS_NO_CALLBACK, 0
}

func main() {
    err := fltRegisterFilter()
    if err != nil {
        fmt.Printf("fltRegisterFilter failed: %v\n", err)
        os.Exit(1)
    }

    fmt.Println("Press ENTER to stop")
    
	//等待用户输入回车后关闭驱动。
	fmt.Scanln()

	fltUnregisterFilter()
}

func fltRegisterFilter() error {
	status := uintptr(0)

	defer func() {
		if status != uintptr(0) {
			fltUnregisterFilter()
		}
	}()

	status = FilterLoad(FilterName, FltMgrInstance)

	if status != 0 {
		return fmt.Errorf("FilterLoad failed with error %v", status)
	}

	status = FilterAttach(FltMgrInstance, FilterAltitude, nil)

	if status != 0 {
		return fmt.Errorf("FilterAttach failed with error %v", status)
	}

	var callbacks FLT_OPERATION_REGISTRATION

	callbacks.MajorFunction = IRP_MJ_ALL_OPERATIONS
	callbacks.PreOperation = syscall.NewCallback(MyFltCallback)

	status = FilterRegister(FilterName, FltMgrInstance, &callbacks, nil, nil)

	if status != 0 {
		return fmt.Errorf("FilterRegister failed with error %v", status)
    }

	fmt.Println("Registered filter")

	return nil
}

func fltUnregisterFilter() error {
	fmt.Println("Unregistering filter...")

	status := FilterDetach(FltMgrInstance, FilterAltitude)

	if status != 0 {
		return fmt.Errorf("FilterDetach failed with error %v", status)
    }

	status = FilterUnload(FilterName)

	if status != 0 {
        return fmt.Errorf("FilterUnload failed with error %v", status)
    }

    fmt.Println("Unregistered filter")

    return nil
}

上面的代码使用了Minifilter API中的一些常用函数，例如FilterLoad、FilterUnload、FilterAttach等。其中，我们主要关注的是回调函数MyFltCallback，它将会在每个文件I/O操作时被调用。

在实现自己的Minifilter时，你需要根据具体需求编写相应的回调函数，并注册到Minifilter中。需要注意的是，Minifilter在运行时会加载到Windows内核中，因此开发过程中需要格外小心，避免造成系统崩溃等严重问题。