Zero
February 19th, 2003, 03:24
A nice problem I am working on:
You can compile with matlab from c++ sources directly DLL´s.
So what you get is only a DLL which you can use within your projects.
for the c++ file you just have to define:
#include "mex.h"
and something like (The name of the file is: myDLL.c):
after compiling with MEX you get a DLL named myDLL.dll
You just have to throw this .dll into the directory where the main file is running
within a Matlab file you just call the function of the DLL like:
myDLL(0,1,1);
Very simple.
Now we get to the problem:
For calling the function MyCoolFunction you just have to add this in your code (assuming it exists in the .dll):
This accesses directly any (!) .dll within your path and searches the function MyCoolFunction(...).
BUT:
The function seems to be defined like this:
The cool thing is:
you can not see the MyCoolFunction with an app like FileInspector because there are NO exports defined !
So there are ONLY 2 ways to reverse this:
1. Reversing the Matlab Environment and hoping that you will somewhere land within the checlLicense routine. After years you know every line within Matlab but maybe not one line of the DLL
2. Reversing the DLL directly
So I want to reverse the DLL directly....
But HOW ?
btw:
if you search for strings within the DLL you find a text-resource like this: "License Invalid"
You can compile with matlab from c++ sources directly DLL´s.
So what you get is only a DLL which you can use within your projects.
for the c++ file you just have to define:
#include "mex.h"
and something like (The name of the file is: myDLL.c):
Code:
void calcDetection(double x[],double y[], double z[])
{
if (y[0] == 1){
z[0] = DoDet(x[0],1);
} else {
z[0] = DoDet(x[0],y[0]);
}
}
void mexFunction( int nlhs, mxArray *plhs[],
int nrhs, const mxArray *prhs[] )
{
double *x,*y,*z,*myType;
float myFloatType;
if(nrhs!=2) {
//mexErrMsgTxt("Two inputs required.";
} else if(nlhs>1) {
//mexErrMsgTxt("Too many output arguments"
}
plhs[0] = mxCreateDoubleMatrix(1,1, mxREAL);
x = mxGetPr(prhs[0]); // get first parameter in x
y = mxGetPr(prhs[1]); // get second parameter in y
myType = mxGetPr(prhs[2]); // get second parameter in y
z = mxGetPr(plhs[0]); // z contains our return value
myFloatType = *myType;
if (myFloatType == 1.00){
// do detection
calcDetection(x,y,z);
}
}
after compiling with MEX you get a DLL named myDLL.dll
You just have to throw this .dll into the directory where the main file is running
within a Matlab file you just call the function of the DLL like:
myDLL(0,1,1);
Very simple.
Now we get to the problem:
For calling the function MyCoolFunction you just have to add this in your code (assuming it exists in the .dll):
Code:
...
MyCoolFunction(param1,param2);
...
This accesses directly any (!) .dll within your path and searches the function MyCoolFunction(...).
BUT:
The function seems to be defined like this:
Code:
MyCoolFunction(param1,param2){
...
checkLicense();
...
normalCode
}
The cool thing is:
you can not see the MyCoolFunction with an app like FileInspector because there are NO exports defined !
So there are ONLY 2 ways to reverse this:
1. Reversing the Matlab Environment and hoping that you will somewhere land within the checlLicense routine. After years you know every line within Matlab but maybe not one line of the DLL
2. Reversing the DLL directly
So I want to reverse the DLL directly....
But HOW ?
btw:
if you search for strings within the DLL you find a text-resource like this: "License Invalid"
