#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>


const char *stack_dump = "%18p %18p %18p %18p\n%18p %18p %18p %18p\n%18p %18p %18p %18p\n%18p %18p %18p %18p\n%18p %18p %18p %18p\n";
char big_buf[6] = {'\0'};

void call_me() {
  system("/bin/sh");
}

int secure_function() {
  uint64_t special_value = 0x4141414141414141;

  puts("Here's the stack:");
  printf(stack_dump);
  printf("Hi! Give me a number so that I can put it at %p.\n", &special_value);
  scanf("%lx", &special_value);

  puts("OK, now give me a scanf string, but please don't exploit me! (max 5 characters)");
  scanf("%5s", big_buf);

  puts("OK, now I'll call scanf with your string and special_value as the only parameter.");
  scanf(big_buf, &special_value);

  puts("OK, all done.");

  return special_value;
}

int main() {
  printf("You entered: %x\n", secure_function());
  return 0;
}