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POHow do you call a function in another address-space in C++
 

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  1. POHow do you call a function in another address-space in C++
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    <p>I'm aware of the threading issues etc that this could cause and of its dangers but I need to know how to do this for a security project I am doing at school. I need to know how to call a function in a remote address space of a given calling convention with arguments - preferably recovering the data the remote function has returned though its really not required that I do.</p> <p>If I can get specifics from the remote function's function prototype at compile time, I will be able to make this method work. I need to know how big the arguments are and if the arguments are explicitly declared as pointers or not <code>(void*, char*, int*, etc...)</code></p> <p>I.e if I define a function prototype like:</p> <pre><code>typedef void (__cdecl *testFunc_t)(int* pData); </code></pre> <p>I would need to, at compile time, get the size of arguments at least, and if I could, which ones are pointers or not. Here we are assuming the remote function is either an <code>stdcall</code> or <code>_cdecl</code> call.</p> <p>The IDE I am using is Microsoft Visual Studio 2007 in case the solution is specific to a particular product.</p> <p>Here is my plan:</p> <ol> <li><p>Create a thread in the remote process using <code>CreateRemoteThread</code> at the origin of the function want to call, though I would do so in a suspended state.</p></li> <li><p>I would setup the stack such that the return address was that of a stub of code allocated inside of the process that would call <code>ExitThread(eax)</code> - as this would exit the thread with the function's return value - I would then recover this by by using <code>GetExitCodeThread</code></p></li> <li><p>I would also copy the arguments for the function call from my local stack to that of the newly created thread - this is where I need to know if function arguments are pointers and the size of the arguments.</p></li> <li><p>Resume the thread and wait for it to exit, at which point I will return to the caller with the threads exit code.</p></li> </ol> <p>I know that this should be doable at compile time but whether the compiler has some method I can use to do it, I'm not sure. I'm also aware all this data can be easily recovered from a PDB file created after compiling the code and that the size of arguments might change if the compiler performs optimizations. I don't need to be told how dangerous this is, as I am fully aware of it, but this is not a commercial product but a small project I must do for school.</p> <p>The question: If I have a function prototype such as typedef void (__cdecl testFunc_t)(int pData); </p> <p>Is there anyway I can get the size of this prototype's arguments at compile time(i.e in the above example, the arguments would sum to a total size of sizeof(int*) If, for example, I have a function like: </p> <pre><code>template&lt;typename T&gt; unsigned long getPrototypeArgLength&lt;T&gt;() { //would return size of arguments described in the prototype T } //when called as getPrototypeArgLength&lt;testFunc&gt;() </code></pre>
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    1. COI'm not quite sure what your *question* is. You've described what you want to do... so does it work for you?
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      1. USGreg Hewgill
    2. COSorry Greg, I should've been more clear. If I have a function prototype such as typedef void (__cdecl *testFunc_t)(int* pData); Is there anyway I can get the size of this prototype's arguments at compile time(i.e in the above example, the arguments would sum to a total size of sizeof(int*) If, for example, I have a function like: template<typename T> unsigned long getPrototypeArgLength<T>() { //would return size of arguments described in the prototype T } Sorry if I used the wrong terminology here. Thanks :)
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    3. COSpecifically, I need help w\ step 3
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