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/*
* (C)opyright 1995 by Darren Reed.
*
* This code may be freely distributed as long as it retains this notice
* and is not changed in any way. The author accepts no responsibility
* for the use of this software. I hate legaleese, don't you ?
*/
#if !defined(lint) && defined(LIBC_SCCS)
static char sccsid[] = "@(#)ipsopt.c 1.2 1/11/96 (C)1995 Darren Reed";
#endif
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include "ip_compat.h"
#ifndef __P
# ifdef __STDC__
# define __P(x) x
# else
# define __P(x) ()
# endif
#endif
struct ipopt_names {
int on_value;
int on_bit;
int on_siz;
char *on_name;
};
struct ipopt_names ionames[] = {
{ IPOPT_EOL, 0x01, 1, "eol" },
{ IPOPT_NOP, 0x02, 1, "nop" },
{ IPOPT_RR, 0x04, 7, "rr" }, /* 1 route */
{ IPOPT_TS, 0x08, 8, "ts" }, /* 1 TS */
{ IPOPT_SECURITY, 0x08, 11, "sec-level" },
{ IPOPT_LSRR, 0x10, 7, "lsrr" }, /* 1 route */
{ IPOPT_SATID, 0x20, 4, "satid" },
{ IPOPT_SSRR, 0x40, 7, "ssrr" }, /* 1 route */
{ 0, 0, 0, NULL } /* must be last */
};
struct ipopt_names secnames[] = {
{ IPOPT_SECUR_UNCLASS, 0x0100, 0, "unclass" },
{ IPOPT_SECUR_CONFID, 0x0200, 0, "confid" },
{ IPOPT_SECUR_EFTO, 0x0400, 0, "efto" },
{ IPOPT_SECUR_MMMM, 0x0800, 0, "mmmm" },
{ IPOPT_SECUR_RESTR, 0x1000, 0, "restr" },
{ IPOPT_SECUR_SECRET, 0x2000, 0, "secret" },
{ IPOPT_SECUR_TOPSECRET, 0x4000,0, "topsecret" },
{ 0, 0, 0, NULL } /* must be last */
};
u_short seclevel __P((char *));
u_long optname __P((char *, char *));
u_short seclevel(slevel)
char *slevel;
{
struct ipopt_names *so;
for (so = secnames; so->on_name; so++)
if (!strcasecmp(slevel, so->on_name))
break;
if (!so->on_name) {
fprintf(stderr, "no such security level: %s\n", slevel);
return 0;
}
return so->on_value;
}
u_long optname(cp, op)
char *cp, *op;
{
struct ipopt_names *io;
u_short lvl;
u_long msk = 0;
char *s, *t;
int len = 0;
for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) {
if ((t = strchr(s, '=')))
*t++ = '\0';
for (io = ionames; io->on_name; io++) {
if (strcasecmp(s, io->on_name) || (msk & io->on_bit))
continue;
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) {
*op++ = io->on_siz;
*op++ = IPOPT_MINOFF;
if (t && !strcasecmp(s, "sec-level")) {
lvl = seclevel(t);
bcopy(&lvl, op, sizeof(lvl));
}
op += io->on_siz - 3;
}
msk |= io->on_bit;
break;
}
if (!io->on_name) {
fprintf(stderr, "unknown IP option name %s\n", s);
return 0;
}
}
*op++ = IPOPT_EOL;
len++;
return len;
}
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