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/* $FreeBSD: src/contrib/ipfilter/ipsend/ipsopt.c,v 1.3.10.1.6.1 2010/12/21 17:09:25 kensmith Exp $ */
/*
* Copyright (C) 1995-1998 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
*/
#if !defined(lint)
static const char sccsid[] = "@(#)ipsopt.c 1.2 1/11/96 (C)1995 Darren Reed";
static const char rcsid[] = "@(#)$Id: ipsopt.c,v 2.4.4.1 2004/03/23 12:58:05 darrenr Exp $";
#endif
#include <sys/param.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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifndef linux
#include <netinet/ip_var.h>
#endif
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include "ipsend.h"
#ifndef __P
# ifdef __STDC__
# define __P(x) x
# else
# define __P(x) ()
# endif
#endif
struct ipopt_names ionames[] = {
{ IPOPT_EOL, 0x01, 1, "eol" },
{ IPOPT_NOP, 0x02, 1, "nop" },
{ IPOPT_RR, 0x04, 3, "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 ipseclevel(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;
}
int addipopt(op, io, len, class)
char *op;
struct ipopt_names *io;
int len;
char *class;
{
struct in_addr ipadr;
int olen = len, srr = 0;
u_short val;
u_char lvl;
char *s = op, *t;
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) {
/*
* Allow option to specify RR buffer length in bytes.
*/
if (io->on_value == IPOPT_RR) {
val = (class && *class) ? atoi(class) : 4;
*op++ = val + io->on_siz;
len += val;
} else
*op++ = io->on_siz;
if (io->on_value == IPOPT_TS)
*op++ = IPOPT_MINOFF + 1;
else
*op++ = IPOPT_MINOFF;
while (class && *class) {
t = NULL;
switch (io->on_value)
{
case IPOPT_SECURITY :
lvl = ipseclevel(class);
*(op - 1) = lvl;
break;
case IPOPT_LSRR :
case IPOPT_SSRR :
if ((t = strchr(class, ',')))
*t = '\0';
ipadr.s_addr = inet_addr(class);
srr++;
bcopy((char *)&ipadr, op, sizeof(ipadr));
op += sizeof(ipadr);
break;
case IPOPT_SATID :
val = atoi(class);
bcopy((char *)&val, op, 2);
break;
}
if (t)
*t++ = ',';
class = t;
}
if (srr)
s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4 * srr;
if (io->on_value == IPOPT_RR)
op += val;
else
op += io->on_siz - 3;
}
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, lastop = -1;
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;
lastop = io->on_value;
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;
}
}
if (len & 3) {
while (len & 3) {
*op++ = ((len & 3) == 3) ? IPOPT_EOL : IPOPT_NOP;
len++;
}
} else {
if (lastop != IPOPT_EOL) {
if (lastop == IPOPT_NOP)
*(op - 1) = IPOPT_EOL;
else {
*op++ = IPOPT_NOP;
*op++ = IPOPT_NOP;
*op++ = IPOPT_NOP;
*op = IPOPT_EOL;
len += 4;
}
}
}
return len;
}
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