stack_3

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{
  volatile int need_modificate;
  char buffer[64];
  char *variable;

  variable = getenv("UCAN");

  if(variable == NULL) {
      errx(1, "Please set the UCAN environment variable\n");
  }

  need_modificate = 0;

  strcpy(buffer, variable);

  if(need_modificate == 0x594f594f) {
      printf("Win! You have did it!\n");
  } else {
      printf("Nope, try again, you got 0x%08x\n", need_modificate);
  }

}