Some questions about Tibiasock.dll

[a3f]

Hello!

While looking at the Tibiasock code (https://code.google.com/p/tibiasock/...ck/dllmain.cpp), I noticed some things I could use some clarification on:

• The main thread is suspended to avoid synchronization problems when calling a function, is that right?
• Executing code is done by codecaving and calling CreateRemoteThread on them. Why aren't they called directly in the DLL?
• Why does this work?
  

  BYTE* CreateOutgoingBuffer(BYTE* dataBuffer, int length)
  {
          BYTE actualBuffer[1024];
          ZeroMemory((LPVOID)actualBuffer, 8);
          memcpy((LPVOID)&actualBuffer[8], (LPVOID)dataBuffer, length-8);
          return actualBuffer; // stack-allocated
  
  }

Thanks for reading

[ottizy]

Yes, it's freezing the main thread to stop the Tibia client itself from using the function that you are currently editing.

The particular code shown on that page is used for external packet sendin (No DLL injection). You can however do exactly the same while injected.

[a3f]

Oh, somehow I thought the dll was meant to be injected... Stupid me

Regarding the snippet above, why isn't that undefined behaviour?

[ottizy]

I don't know why it should be undefined behaviour? Why would it be?

[DarkstaR]

Oh, somehow I thought the dll was meant to be injected... Stupid me

Regarding the snippet above, why isn't that undefined behaviour?

That was a noob coding mistake on my part when I wrote the code, haha. Just happens to work because the code that's using it has a lower stack frame.

I don't know why it should be undefined behaviour? Why would it be?

The BYTE [] is allocated on the stack and then a pointer to it is returned. If the caller were to call another function, it is very likely that function would overwrite parts of the buffer with its own stack frame.

[ottizy]

That was a noob coding mistake on my part when I wrote the code, haha. Just happens to work because the code that's using it has a lower stack frame.



The BYTE [] is allocated on the stack and then a pointer to it is returned. If the caller were to call another function, it is very likely that function would overwrite parts of the buffer with its own stack frame.

Ah okay, so

BYTE *actualBuffer = new BYTE[1024];

would be the way to go?

[DarkstaR]

Ah okay, so

BYTE *actualBuffer = new BYTE[1024];

would be the way to go?

I'd probably use "auto actualBuffer = std::shared_ptr<BYTE>(new BYTE[1024]);", and set a fitting return type.
I really don't like returning new'd things from functions, it's memory leak city, and I've learned the hard way haha

[a3f]

Just happens to work because the code that's using it has a lower stack frame.

Ah, that makes sense. Thanks for the help, you two.

[Alexcali]

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