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从SQL Server检索CLR DLL

clr dll vb.net sql

Jens · 技术社区 · 14 年前

是否可以重新生成或检索一个VB CLR dll文件,该文件是您不久前导入到SQL中的? 我已经到了可以通过以下操作找到此DLL内容的地步:

SELECT * FROM sys.assembly_files

但是我不知道如何用那里找到的内容重建dll。

任何帮助都将不胜感激:)

3 回复 | 直到 13 年前

user114600user114600 14 年前

有一个很好的例子 here . 以下代码来自提供的链接。

DECLARE @IMG_PATH VARBINARY(MAX)
DECLARE @ObjectToken INT

SELECT @IMG_PATH = content FROM sys.assembly_files WHERE assembly_id = 65536

EXEC sp_OACreate 'ADODB.Stream', @ObjectToken OUTPUT
        EXEC sp_OASetProperty @ObjectToken, 'Type', 1
        EXEC sp_OAMethod @ObjectToken, 'Open'
        EXEC sp_OAMethod @ObjectToken, 'Write', NULL, @IMG_PATH
        EXEC sp_OAMethod @ObjectToken, 'SaveToFile', NULL, 'D:\SqlServerProject1.dll', 2
        EXEC sp_OAMethod @ObjectToken, 'Close'
        EXEC sp_OADestroy @ObjectToken

我可以想象.NET Reflector在提取DLL后将是您的反向工程朋友,但我不知道它是否以任何方式加密。

Jens 14 年前

我终于明白了。我添加了一个新程序集,用于处理DLL的创建:

CREATE ASSEMBLY [SqlServerProject1]
AUTHORIZATION [dbo]
FROM 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WITH PERMISSION_SET = UNSAFE;

之后,我添加了使用它的过程:

CREATE PROCEDURE [dbo].[sspSaveAssemblyToDisk]
@pAssemblyname NVARCHAR (4000), @pFilename NVARCHAR (4000)
AS EXTERNAL NAME [SqlServerProject1].[SqlServerProject1.StoredProcedures].[sspSaveAssemblyToDisk]

然后我运行我的过程并为它提供保存文件的路径和程序集的名称:

exec sspSaveAssemblyToDisk 'MyAssemblyName','C:\Assemblies\MyAssembly.dll'

确保您对保存文件的位置有写权限,然后就可以了!

hIpPy 12 年前

我最后做了这个。

我得到了要为其生成dll的CLR程序集的创建脚本。

CREATE ASSEMBLY [asmClr]
AUTHORIZATION [dbo]
FROM [some_hex_value] //hex value removed for brevity
WITH PERMISSION_SET = UNSAFE;

在删除开始的“x”字符串后,我使用C#将十六进制值(一些_hex#值)转换为字节。也有LINQ示例,用于将十六进制转换为字节。

byte[] StringToByteArray(string hex)
{
    var bytes = new byte[hex.Length / 2]; // 2 hex chars = 1 byte
    for (int i = 0; i < bytes.Length; i++)
    {
        string bytehex = hex.Substring(2*i, 2);
        byte b = Byte.Parse(bytehex, NumberStyles.HexNumber);
        bytes[i] = b;
    }
    return bytes;
}

我把字节写到了文件系统。

File.WriteAllBytes(@"D:\clr.dll", bytes);

我用ILSpy查找dll源代码。