/*
 * Copyright (C) 1993-2001 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id: addipopt.c,v 1.7 2002/01/28 06:50:45 darrenr Exp $
 */

#include "ipf.h"


int addipopt(op, io, len, class)
char *op;
struct ipopt_names *io;
int len;
char *class;
{
        int olen = len;
        struct in_addr ipadr;
        u_short val;
        u_char lvl;
        char *s;

        if ((len + io->on_siz) > 48) {
                fprintf(stderr, "options too long\n");
                return 0;
        }
        len += io->on_siz;
        *op++ = io->on_value;
        if (io->on_siz > 1) {
                s = op;
                *op++ = io->on_siz;
                *op++ = IPOPT_MINOFF;

                if (class) {
                        switch (io->on_value)
                        {
                        case IPOPT_SECURITY :
                                lvl = seclevel(class);
                                *(op - 1) = lvl;
                                break;
                        case IPOPT_LSRR :
                        case IPOPT_SSRR :
                                ipadr.s_addr = inet_addr(class);
                                s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4;
                                bcopy((char *)&ipadr, op, sizeof(ipadr));
                                break;
                        case IPOPT_SATID :
                                val = atoi(class);
                                bcopy((char *)&val, op, 2);
                                break;
                        }
                }

                op += io->on_siz - 3;
                if (len & 3) {
                        *op++ = IPOPT_NOP;
                        len++;
                }
        }
        if (opts & OPT_DEBUG)
                fprintf(stderr, "bo: %s %d %#x: %d\n",
                        io->on_name, io->on_value, io->on_bit, len);
        return len - olen;
}