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/*
* Detection of various tricks
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*
* Dead simple try to detect the LD_PRELOAD trick by looking
* into environnement variables of the program.
*/
int various_ldpreload(){
return (getenv("LD_PRELOAD") != NULL);
}
/*
* Try to detect the LD_PRELOAD trick when used with a custom
* gentenv() function. Feel free to expand it using the same principe.
*/
int various_ldpreload_custom_getenv(){
if(!various_ldpreload()){
putenv("LD_PRELOAD=hello");
return (strcmp(getenv("LD_PRELOAD"), "hello"));
}
return 1;
}
/*
* Timiming attack, useful for detecting breakpoints
*/
int various_rdtsc(){
clock_t t = clock();
int i; //Time-consuming crap
for(i=2; i<7137001; i++)
if (7137001 % i == 0)
break;
return (clock() - t > 0xffff); //adjust this
}
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