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tcpdump/print-ip6opts.c
guy 988cd2bb0e Have various routines for printing non-final headers for IPv4/IPv6 
return -1 if they run out of data.

Have the IPv4 and IPv6 dissectors check for non-positive return values
from those routines and quit if they see one.
2003-11-19 00:36:06 +00:00

336 lines
8.4 KiB
C
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/*
* Copyright (C) 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-ip6opts.c,v 1.17 2003-11-19 00:36:08 guy Exp $";
#endif
#ifdef INET6
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include "ip6.h"
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
/* items outside of rfc2292bis */
#ifndef IP6OPT_MINLEN
#define IP6OPT_MINLEN 2
#endif
#ifndef IP6OPT_RTALERT_LEN
#define IP6OPT_RTALERT_LEN 4
#endif
#ifndef IP6OPT_JUMBO_LEN
#define IP6OPT_JUMBO_LEN 6
#endif
#define IP6OPT_HOMEADDR_MINLEN 18
#define IP6OPT_BU_MINLEN 10
#define IP6OPT_BA_MINLEN 13
#define IP6OPT_BR_MINLEN 2
#define IP6SOPT_UI 0x2
#define IP6SOPT_UI_MINLEN 4
#define IP6SOPT_ALTCOA 0x3
#define IP6SOPT_ALTCOA_MINLEN 18
#define IP6SOPT_AUTH 0x4
#define IP6SOPT_AUTH_MINLEN 6
static void ip6_sopt_print(const u_char *, int);
static void
ip6_sopt_print(const u_char *bp, int len)
{
int i;
int optlen;
for (i = 0; i < len; i += optlen) {
if (bp[i] == IP6OPT_PAD1)
optlen = 1;
else {
if (i + 1 < len)
optlen = bp[i + 1] + 2;
else
goto trunc;
}
if (i + optlen > len)
goto trunc;
switch (bp[i]) {
case IP6OPT_PAD1:
printf(", pad1");
break;
case IP6OPT_PADN:
if (len - i < IP6OPT_MINLEN) {
printf(", padn: trunc");
goto trunc;
}
printf(", padn");
break;
case IP6SOPT_UI:
if (len - i < IP6SOPT_UI_MINLEN) {
printf(", ui: trunc");
goto trunc;
}
printf(", ui: 0x%04x ", EXTRACT_16BITS(&bp[i + 2]));
break;
case IP6SOPT_ALTCOA:
if (len - i < IP6SOPT_ALTCOA_MINLEN) {
printf(", altcoa: trunc");
goto trunc;
}
printf(", alt-CoA: %s", ip6addr_string(&bp[i+2]));
break;
case IP6SOPT_AUTH:
if (len - i < IP6SOPT_AUTH_MINLEN) {
printf(", auth: trunc");
goto trunc;
}
printf(", auth spi: 0x%08x", EXTRACT_32BITS(&bp[i + 2]));
break;
default:
if (len - i < IP6OPT_MINLEN) {
printf(", sopt_type %d: trunc)", bp[i]);
goto trunc;
}
printf(", sopt_type 0x%02x: len=%d", bp[i], bp[i + 1]);
break;
}
}
return;
trunc:
printf("[trunc] ");
}
void
ip6_opt_print(const u_char *bp, int len)
{
int i;
int optlen = 0;
for (i = 0; i < len; i += optlen) {
if (bp[i] == IP6OPT_PAD1)
optlen = 1;
else {
if (i + 1 < len)
optlen = bp[i + 1] + 2;
else
goto trunc;
}
if (i + optlen > len)
goto trunc;
switch (bp[i]) {
case IP6OPT_PAD1:
printf("(pad1)");
break;
case IP6OPT_PADN:
if (len - i < IP6OPT_MINLEN) {
printf("(padn: trunc)");
goto trunc;
}
printf("(padn)");
break;
case IP6OPT_ROUTER_ALERT:
if (len - i < IP6OPT_RTALERT_LEN) {
printf("(rtalert: trunc)");
goto trunc;
}
if (bp[i + 1] != IP6OPT_RTALERT_LEN - 2) {
printf("(rtalert: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(rtalert: 0x%04x) ", EXTRACT_16BITS(&bp[i + 2]));
break;
case IP6OPT_JUMBO:
if (len - i < IP6OPT_JUMBO_LEN) {
printf("(jumbo: trunc)");
goto trunc;
}
if (bp[i + 1] != IP6OPT_JUMBO_LEN - 2) {
printf("(jumbo: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(jumbo: %u) ", EXTRACT_32BITS(&bp[i + 2]));
break;
case IP6OPT_HOME_ADDRESS:
if (len - i < IP6OPT_HOMEADDR_MINLEN) {
printf("(homeaddr: trunc)");
goto trunc;
}
if (bp[i + 1] < IP6OPT_HOMEADDR_MINLEN - 2) {
printf("(homeaddr: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(homeaddr: %s", ip6addr_string(&bp[i + 2]));
if (bp[i + 1] > IP6OPT_HOMEADDR_MINLEN - 2) {
ip6_sopt_print(&bp[i + IP6OPT_HOMEADDR_MINLEN],
(optlen - IP6OPT_HOMEADDR_MINLEN));
}
printf(")");
break;
case IP6OPT_BINDING_UPDATE:
if (len - i < IP6OPT_BU_MINLEN) {
printf("(bu: trunc)");
goto trunc;
}
if (bp[i + 1] < IP6OPT_BU_MINLEN - 2) {
printf("(bu: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(bu: ");
if (bp[i + 2] & 0x80)
printf("A");
if (bp[i + 2] & 0x40)
printf("H");
if (bp[i + 2] & 0x20)
printf("S");
if (bp[i + 2] & 0x10)
printf("D");
if ((bp[i + 2] & 0x0f) || bp[i + 3] || bp[i + 4])
printf("res");
printf(", sequence: %u", bp[i + 5]);
printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 6]));
if (bp[i + 1] > IP6OPT_BU_MINLEN - 2) {
ip6_sopt_print(&bp[i + IP6OPT_BU_MINLEN],
(optlen - IP6OPT_BU_MINLEN));
}
printf(")");
break;
case IP6OPT_BINDING_ACK:
if (len - i < IP6OPT_BA_MINLEN) {
printf("(ba: trunc)");
goto trunc;
}
if (bp[i + 1] < IP6OPT_BA_MINLEN - 2) {
printf("(ba: invalid len %d)", bp[i + 1]);
goto trunc;
}
printf("(ba: ");
printf("status: %u", bp[i + 2]);
if (bp[i + 3])
printf("res");
printf(", sequence: %u", bp[i + 4]);
printf(", lifetime: %u", EXTRACT_32BITS(&bp[i + 5]));
printf(", refresh: %u", EXTRACT_32BITS(&bp[i + 9]));
if (bp[i + 1] > IP6OPT_BA_MINLEN - 2) {
ip6_sopt_print(&bp[i + IP6OPT_BA_MINLEN],
(optlen - IP6OPT_BA_MINLEN));
}
printf(")");
break;
case IP6OPT_BINDING_REQ:
if (len - i < IP6OPT_BR_MINLEN) {
printf("(br: trunc)");
goto trunc;
}
printf("(br");
if (bp[i + 1] > IP6OPT_BR_MINLEN - 2) {
ip6_sopt_print(&bp[i + IP6OPT_BR_MINLEN],
(optlen - IP6OPT_BR_MINLEN));
}
printf(")");
break;
default:
if (len - i < IP6OPT_MINLEN) {
printf("(type %d: trunc)", bp[i]);
goto trunc;
}
printf("(opt_type 0x%02x: len=%d) ", bp[i], bp[i + 1]);
break;
}
}
#if 0
end:
#endif
return;
trunc:
printf("[trunc] ");
}
int
hbhopt_print(register const u_char *bp)
{
const struct ip6_hbh *dp = (struct ip6_hbh *)bp;
register const u_char *ep;
int hbhlen = 0;
/* 'ep' points to the end of available data. */
ep = snapend;
TCHECK(dp->ip6h_len);
hbhlen = (int)((dp->ip6h_len + 1) << 3);
TCHECK2(*dp, hbhlen);
printf("HBH ");
if (vflag)
ip6_opt_print((const u_char *)dp + sizeof(*dp), hbhlen - sizeof(*dp));
return(hbhlen);
trunc:
fputs("[|HBH]", stdout);
return(-1);
}
int
dstopt_print(register const u_char *bp)
{
const struct ip6_dest *dp = (struct ip6_dest *)bp;
register const u_char *ep;
int dstoptlen = 0;
/* 'ep' points to the end of available data. */
ep = snapend;
TCHECK(dp->ip6d_len);
dstoptlen = (int)((dp->ip6d_len + 1) << 3);
TCHECK2(*dp, dstoptlen);
printf("DSTOPT ");
if (vflag) {
ip6_opt_print((const u_char *)dp + sizeof(*dp),
dstoptlen - sizeof(*dp));
}
return(dstoptlen);
trunc:
fputs("[|DSTOPT]", stdout);
return(-1);
}
#endif /* INET6 */
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