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
addipopt(op,io,len,class)12 int addipopt(op, io, len, class)
13 char *op;
14 struct ipopt_names *io;
15 int len;
16 char *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