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
21
22#ifndef __P
23# ifdef __STDC__
24# define __P(x) x
25# else
26# define __P(x) ()
27# endif
28#endif
29
30
31struct ipopt_names {
32 int on_value;
33 int on_bit;
34 int on_siz;
35 char *on_name;
36};
37
38struct ipopt_names ionames[] = {
39 { IPOPT_EOL, 0x01, 1, "eol" },
40 { IPOPT_NOP, 0x02, 1, "nop" },
41 { IPOPT_RR, 0x04, 7, "rr" }, /* 1 route */
42 { IPOPT_TS, 0x08, 8, "ts" }, /* 1 TS */
43 { IPOPT_SECURITY, 0x08, 11, "sec-level" },
44 { IPOPT_LSRR, 0x10, 7, "lsrr" }, /* 1 route */
45 { IPOPT_SATID, 0x20, 4, "satid" },
46 { IPOPT_SSRR, 0x40, 7, "ssrr" }, /* 1 route */
47 { 0, 0, 0, NULL } /* must be last */
48};
49

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54 { IPOPT_SECUR_MMMM, 0x0800, 0, "mmmm" },
55 { IPOPT_SECUR_RESTR, 0x1000, 0, "restr" },
56 { IPOPT_SECUR_SECRET, 0x2000, 0, "secret" },
57 { IPOPT_SECUR_TOPSECRET, 0x4000,0, "topsecret" },
58 { 0, 0, 0, NULL } /* must be last */
59};
60
61
62u_short seclevel __P((char *));
63u_long optname __P((char *, char *));
64
65
66u_short seclevel(slevel)
67char *slevel;
68{
69 struct ipopt_names *so;
70
71 for (so = secnames; so->on_name; so++)
72 if (!strcasecmp(slevel, so->on_name))
73 break;
74
75 if (!so->on_name) {
76 fprintf(stderr, "no such security level: %s\n", slevel);
77 return 0;
78 }
79 return so->on_value;
80}
81
82
83u_long optname(cp, op)
84char *cp, *op;
85{
86 struct ipopt_names *io;
87 u_short lvl;
88 u_long msk = 0;
89 char *s, *t;
90 int len = 0;
91
92 for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) {
93 if ((t = strchr(s, '=')))
94 *t++ = '\0';
95 for (io = ionames; io->on_name; io++) {
96 if (strcasecmp(s, io->on_name) || (msk & io->on_bit))
97 continue;
98 if ((len + io->on_siz) > 48) {
99 fprintf(stderr, "options too long\n");
100 return 0;
101 }
102 len += io->on_siz;
103 *op++ = io->on_value;
104 if (io->on_siz > 1) {
105 *op++ = io->on_siz;
106 *op++ = IPOPT_MINOFF;
107
108 if (t && !strcasecmp(s, "sec-level")) {
109 lvl = seclevel(t);
110 bcopy(&lvl, op, sizeof(lvl));
111 }
112 op += io->on_siz - 3;
113 }
114 msk |= io->on_bit;
115 break;
116 }
117 if (!io->on_name) {
118 fprintf(stderr, "unknown IP option name %s\n", s);
119 return 0;
120 }
121 }
122 *op++ = IPOPT_EOL;
123 len++;
124 return len;
125}