实施PT_DENY_ATTACH反盗版代码 [英] Implementing the PT_DENY_ATTACH anti-piracy code

问题描述

我已经尝试从这个wiki实现以下反盗版代码：
http://theiphonewiki.com/wiki/index.php?title=Bugging_Debuggers

I've been tryign to implement the following anti piracy code from this wiki: http://theiphonewiki.com/wiki/index.php?title=Bugging_Debuggers

但是尽管遵循了这封信我的应用程序退出了

But despite following it to the letter my app exits with a

Program exited with status value:45.

当我测试它时。如果我注释掉函数调用disable_gdb（）;该应用程序正常运行。

When i test it. If i comment out the function call disable_gdb(); the app runs as normal.

我做错了什么。或者是代码正在按原样执行..并在附加xcode时退出？

What is it that I'm doing wrong. Or is it that the code is doing as it should.. and exits while xcode is attached?

#import <UIKit/UIKit.h>
#import <dlfcn.h>
#import <sys/types.h>

typedef int (*ptrace_ptr_t)(int _request, pid_t _pid, caddr_t _addr, int _data);
#if !defined(PT_DENY_ATTACH)
#define PT_DENY_ATTACH 31
#endif  // !defined(PT_DENY_ATTACH)

int main(int argc, char *argv[]) 
{
NSLog(@"Main Called ");
disable_gdb();
NSLog(@"After cracker code");
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, nil);
[pool release];
return retVal;
}



void disable_gdb()
{
void* handle = dlopen(0, RTLD_GLOBAL | RTLD_NOW);
ptrace_ptr_t ptrace_ptr = dlsym(handle, "ptrace");
ptrace_ptr(PT_DENY_ATTACH, 0, 0, 0);
dlclose(handle);
}

int main3(int argc, char *argv[])
{
return -1;
}

Kindest Regards，
-Code

Kindest Regards, -Code

推荐答案

代码按预期运行。那就是说，我应该告诉你，你在浪费时间。这种方法只有在 gdb 且攻击者/程序员合作时才有效。像 gdb 这样的工具的全部意义在于它们非常多才多艺，如果这样一个简单的bug阻止它们死在他们的轨道上，那么某人会很快解决它。 ：）

The code is functioning as intended. That said, I should tell you that you're wasting your time. This approach will only work if gdb and the attacker/programmer are cooperative. The whole point of tools like gdb is that they are extremely versatile and if a simple "bug" like this stopped them dead in their tracks, someone would fix it very quickly. :)

如这个页面，你可以在 gdb 中执行以下操作：

As described on this page, you can just do the following from within gdb:

(gdb) break ptrace
commands 1
    return
    continue
end

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