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/* $OpenBSD: opt.c,v 1.16 2001/01/30 04:26:01 kjell Exp $ */
/*
* Copyright (C) 1993-2000 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.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>
#ifndef linux
#include <netinet/ip_var.h>
#endif
#include <netinet/tcp.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <netinet/ip_fil_compat.h>
#include <netinet/tcpip.h>
#include <netinet/ip_fil.h>
#include "ipf.h"
#if !defined(lint)
static const char sccsid[] = "@(#)opt.c 1.8 4/10/96 (C) 1993-2000 Darren Reed";
static const char rcsid[] = "@(#)$IPFilter: opt.c,v 2.2 2000/03/13 22:10:26 darrenr Exp $";
#endif
extern int opts;
struct ipopt_names ionames[] ={
{ IPOPT_NOP, 0x000001, 1, "nop" },
{ IPOPT_RR, 0x000002, 7, "rr" }, /* 1 route */
{ IPOPT_ZSU, 0x000004, 3, "zsu" },
{ IPOPT_MTUP, 0x000008, 3, "mtup" },
{ IPOPT_MTUR, 0x000010, 3, "mtur" },
{ IPOPT_ENCODE, 0x000020, 3, "encode" },
{ IPOPT_TS, 0x000040, 8, "ts" }, /* 1 TS */
{ IPOPT_TR, 0x000080, 3, "tr" },
{ IPOPT_SECURITY,0x000100, 11, "sec" },
{ IPOPT_SECURITY,0x000100, 11, "sec-class" },
{ IPOPT_LSRR, 0x000200, 7, "lsrr" }, /* 1 route */
{ IPOPT_E_SEC, 0x000400, 3, "e-sec" },
{ IPOPT_CIPSO, 0x000800, 3, "cipso" },
{ IPOPT_SATID, 0x001000, 4, "satid" },
{ IPOPT_SSRR, 0x002000, 7, "ssrr" }, /* 1 route */
{ IPOPT_ADDEXT, 0x004000, 3, "addext" },
{ IPOPT_VISA, 0x008000, 3, "visa" },
{ IPOPT_IMITD, 0x010000, 3, "imitd" },
{ IPOPT_EIP, 0x020000, 3, "eip" },
{ IPOPT_FINN, 0x040000, 3, "finn" },
{ 0, 0, 0, (char *)NULL } /* must be last */
};
struct ipopt_names secclass[] = {
{ IPSO_CLASS_RES4, 0x01, 0, "reserv-4" },
{ IPSO_CLASS_TOPS, 0x02, 0, "topsecret" },
{ IPSO_CLASS_SECR, 0x04, 0, "secret" },
{ IPSO_CLASS_RES3, 0x08, 0, "reserv-3" },
{ IPSO_CLASS_CONF, 0x10, 0, "confid" },
{ IPSO_CLASS_UNCL, 0x20, 0, "unclass" },
{ IPSO_CLASS_RES2, 0x40, 0, "reserv-2" },
{ IPSO_CLASS_RES1, 0x80, 0, "reserv-1" },
{ 0, 0, 0, NULL } /* must be last */
};
static u_char seclevel __P((char *));
int addipopt __P((char *, struct ipopt_names *, int, char *));
static u_char seclevel(slevel)
char *slevel;
{
struct ipopt_names *so;
for (so = secclass; 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 (u_char)so->on_value;
}
int addipopt(op, io, len, class)
char *op;
struct ipopt_names *io;
int len;
char *class;
{
int olen = len;
struct in_addr ipadr;
u_short val;
u_char lvl;
char *s;
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) {
s = op;
*op++ = io->on_siz;
*op++ = IPOPT_MINOFF;
if (class) {
switch (io->on_value)
{
case IPOPT_SECURITY :
lvl = seclevel(class);
*(op - 1) = lvl;
break;
case IPOPT_LSRR :
case IPOPT_SSRR :
ipadr.s_addr = inet_addr(class);
s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4;
bcopy((char *)&ipadr, op, sizeof(ipadr));
break;
case IPOPT_SATID :
val = atoi(class);
bcopy((char *)&val, op, 2);
break;
}
}
op += io->on_siz - 3;
if (len & 3) {
*op++ = IPOPT_NOP;
len++;
}
}
if (opts & OPT_DEBUG)
fprintf(stderr, "bo: %s %d %#x: %d\n",
io->on_name, io->on_value, io->on_bit, len);
return len - olen;
}
u_32_t buildopts(cp, op, len)
char *cp, *op;
int len;
{
struct ipopt_names *io;
u_32_t msk = 0;
char *s, *t;
int inc;
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 ((inc = addipopt(op, io, len, t))) {
op += inc;
len += inc;
}
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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