NDH 2k10 public wargame, level7

/***********************************
|            level7.c              |
|  http://wargame.nuitduhack.com/  |
|  http://www.nuitduhack.com/      |
***********************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// gcc -o level7 level7.c -fno-stack-protector -z execstack -mpreferred-stack-boundary=2

unsigned int secret;

int vuln(char *arg) {
    unsigned int cookie = secret;
    char tmp[64] = {'\0'};

    strcpy(tmp, arg);
    if(cookie!=secret) {
        printf("It's not my cookie :(\n");
        exit(0);
    }

    return 1337;
}

int main(int argc, char *argv[])
{
    if(argc != 2) {
        printf("%s <P0wn Me!> \n", argv[0]);
        exit(0);
    }

    srand(time(NULL));
    secret = rand();

    printf("GooD Boy :) %08X\n", secret);

    vuln(argv[1]);
    return 0;
}