1/*
2 * Copyright (C) 1993-2001 by Darren Reed.
3 *
4 * See the IPFILTER.LICENCE file for details on licencing.
5 *
6 * $Id: addipopt.c,v 1.7 2002/01/28 06:50:45 darrenr Exp $
7 */
8
9#include "ipf.h"
10
11
12int addipopt(op, io, len, class)
13char *op;
14struct ipopt_names *io;
15int len;
16char *class;
17{
18	int olen = len;
19	struct in_addr ipadr;
20	u_short val;
21	u_char lvl;
22	char *s;
23
24	if ((len + io->on_siz) > 48) {
25		fprintf(stderr, "options too long\n");
26		return 0;
27	}
28	len += io->on_siz;
29	*op++ = io->on_value;
30	if (io->on_siz > 1) {
31		s = op;
32		*op++ = io->on_siz;
33		*op++ = IPOPT_MINOFF;
34
35		if (class) {
36			switch (io->on_value)
37			{
38			case IPOPT_SECURITY :
39				lvl = seclevel(class);
40				*(op - 1) = lvl;
41				break;
42			case IPOPT_LSRR :
43			case IPOPT_SSRR :
44				ipadr.s_addr = inet_addr(class);
45				s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4;
46				bcopy((char *)&ipadr, op, sizeof(ipadr));
47				break;
48			case IPOPT_SATID :
49				val = atoi(class);
50				bcopy((char *)&val, op, 2);
51				break;
52			}
53		}
54
55		op += io->on_siz - 3;
56		if (len & 3) {
57			*op++ = IPOPT_NOP;
58			len++;
59		}
60	}
61	if (opts & OPT_DEBUG)
62		fprintf(stderr, "bo: %s %d %#x: %d\n",
63			io->on_name, io->on_value, io->on_bit, len);
64	return len - olen;
65}
66