ipsopt.c revision 22514 
1/*
2 * (C)opyright 1995 by Darren Reed.
3 *
4 * This code may be freely distributed as long as it retains this notice
5 * and is not changed in any way.  The author accepts no responsibility
6 * for the use of this software.  I hate legaleese, don't you ?
7 */
8#if !defined(lint) && defined(LIBC_SCCS)
9static	char	sccsid[] = "@(#)ipsopt.c	1.2 1/11/96 (C)1995 Darren Reed";
10#endif
11#include <stdio.h>
12#include <string.h>
13#include <sys/types.h>
14#include <sys/time.h>
15#include <sys/socket.h>
16#include <netinet/in.h>
17#include <netinet/in_systm.h>
18#include <netinet/ip.h>
19#include "ip_compat.h"
20
21struct ipopt_names {
22	int	on_value;
23	int	on_bit;
24	int	on_siz;
25	char	*on_name;
26};
27
28struct ipopt_names ionames[] = {
29	{ IPOPT_EOL,	0x01,	1, "eol" },
30	{ IPOPT_NOP,	0x02,	1, "nop" },
31	{ IPOPT_RR,	0x04,	7, "rr" },	/* 1 route */
32	{ IPOPT_TS,	0x08,	8, "ts" },	/* 1 TS */
33	{ IPOPT_SECURITY, 0x08,	11, "sec-level" },
34	{ IPOPT_LSRR,	0x10,	7, "lsrr" },	/* 1 route */
35	{ IPOPT_SATID,	0x20,	4, "satid" },
36	{ IPOPT_SSRR,	0x40,	7, "ssrr" },	/* 1 route */
37	{ 0, 0, 0, NULL }	/* must be last */
38};
39
40struct	ipopt_names secnames[] = {
41	{ IPOPT_SECUR_UNCLASS,	0x0100,	0, "unclass" },
42	{ IPOPT_SECUR_CONFID,	0x0200,	0, "confid" },
43	{ IPOPT_SECUR_EFTO,	0x0400,	0, "efto" },
44	{ IPOPT_SECUR_MMMM,	0x0800,	0, "mmmm" },
45	{ IPOPT_SECUR_RESTR,	0x1000,	0, "restr" },
46	{ IPOPT_SECUR_SECRET,	0x2000,	0, "secret" },
47	{ IPOPT_SECUR_TOPSECRET, 0x4000,0, "topsecret" },
48	{ 0, 0, 0, NULL }	/* must be last */
49};
50
51
52u_short seclevel(slevel)
53char *slevel;
54{
55	struct ipopt_names *so;
56
57	for (so = secnames; so->on_name; so++)
58		if (!strcasecmp(slevel, so->on_name))
59			break;
60
61	if (!so->on_name) {
62		fprintf(stderr, "no such security level: %s\n", slevel);
63		return 0;
64	}
65	return so->on_value;
66}
67
68
69u_long optname(cp, op)
70char *cp, *op;
71{
72	struct ipopt_names *io;
73	u_short lvl;
74	u_long msk = 0;
75	char *s, *t;
76	int len = 0;
77
78	for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) {
79		if ((t = strchr(s, '=')))
80			*t++ = '\0';
81		for (io = ionames; io->on_name; io++) {
82			if (strcasecmp(s, io->on_name) || (msk & io->on_bit))
83				continue;
84			if ((len + io->on_siz) > 48) {
85				fprintf(stderr, "options too long\n");
86				return 0;
87			}
88			len += io->on_siz;
89			*op++ = io->on_value;
90			if (io->on_siz > 1) {
91				*op++ = io->on_siz;
92				*op++ = IPOPT_MINOFF;
93
94				if (t && !strcasecmp(s, "sec-level")) {
95					lvl = seclevel(t);
96					bcopy(&lvl, op, sizeof(lvl));
97				}
98				op += io->on_siz - 3;
99			}
100			msk |= io->on_bit;
101			break;
102		}
103		if (!io->on_name) {
104			fprintf(stderr, "unknown IP option name %s\n", s);
105			return 0;
106		}
107	}
108	*op++ = IPOPT_EOL;
109	len++;
110	return len;
111}
112