我们平时在工作中经常会遇到一些已经被编译后的DLL,而且更加麻烦的是没有源代码可以进行修改,只能针对这个DLL的文件进行修改才能得到我们想要的结果。
本文将通过一个实例来演示:如何完成一个简单的修改。
我们将会用到以下几种工具;
1、微软的工具ildasm.exe:这个是把DLL生成IL文件的一个软件,是微软自带了;可以在C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin找到该软件;
2、微软的工具ilasm.exe:这个是把IL文件重新生成DLL的功能,可以在C:\Windows\Microsoft.NET\Framework\v4.0.30319找到该软件。
要使用ildasm.exe把DLL这个文件转化成IL文件
把dll文件转储为*.il文件存到某个指定文件夹里,得到Web.il和Web.res两个文件,有时也会有*.resource文件
我们可以打开Web.il文件,里面有DLL生成的IL内容,我们很容易就可以定位到想要的这个方法,只要让它固定返回true就可以修改成功,方法内的IL代码就是我们要修改的内容,修改GetLicense()方法内的IL代码,让它固定返回true。
下面这个IL就是让它返回为true;修改完接着保存IL文件;
当修改完IL文件后要把它转化成DLL文件,打开DOC命令输入进入到*.il的文件夹,然后输入命令:
c:\windows\microsoft.net\framework\v4.0.30319\ilasm.exe /dll/resource=Web.res Web.il
1:要进入IL文件的文件夹
2:其中"/dll/"这个前面要有一个空格
3:.res文件要在.il文件前面,中间要有个空格
运行完上面的命令后会生成一个新DLL文件,然后把它复制到我们的站点下面:
运行的结果:
完成上面的步骤就可以成功修改DLL文件,当然本实例只是一个简单的修改,若要进行比较复杂修改IL代码则要对IL知识有个相当的了解。
注意 .il文件 每行开头的IL_0000 是相当于一个内存地址,如果改动涉及到增删行数的时候 需要注意修改内存地址,如果不方便精确计算,可把修改处后面的地址整体增加整百整千 如IL_333a改成IL_433a。
下面是一个可能会经常要用到的IL返回true跟false的代码;
.maxstack 1 .locals init ( [0] bool CS$1$0000) L_0000: nop L_0001: ldc.i4.1 L_0002: stloc.0 L_0003: br.s L_0005 L_0005: ldloc.0 L_0006: ret return true; // 代码大小 7 (0x7) .maxstack 1 .locals init ([0] bool CS$1$0000) IL_0000: nop IL_0001: ldc.i4.0 IL_0002: stloc.0 IL_0003: br.s IL_0005 IL_0005: ldloc.0 IL_0006: ret return false;
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