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/*
* Copyright (C) 1998 and 1999 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.
*/
/*
* draft-ietf-dhc-dhcpv6-22.txt
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.14.4.2 2002/06/01 23:51:12 guy Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include "interface.h"
#include "addrtoname.h"
/* Error Values */
#define DH6ERR_FAILURE 16
#define DH6ERR_AUTHFAIL 17
#define DH6ERR_POORLYFORMED 18
#define DH6ERR_UNAVAIL 19
#define DH6ERR_OPTUNAVAIL 20
/* Message type */
#define DH6_REPLY 7
#define DH6_INFORM_REQ 11
/* DHCP6 base packet format */
struct dhcp6 {
union {
u_int8_t m;
u_int32_t x;
} dh6_msgtypexid;
struct in6_addr dh6_servaddr;
/* options follow */
} __attribute__ ((__packed__));
#define dh6_msgtype dh6_msgtypexid.m
#define dh6_xid dh6_msgtypexid.x
#define DH6_XIDMASK 0x00ffffff
/* option */
#define DH6OPT_DUID 1 /* TBD */
#define DH6OPT_DNS 11 /* TBD */
struct dhcp6opt {
u_int16_t dh6opt_type;
u_int16_t dh6opt_len;
/* type-dependent data follows */
} __attribute__ ((__packed__));
static void
dhcp6opt_print(u_char *cp, u_char *ep)
{
struct dhcp6opt *dh6o;
u_char *tp;
int i;
size_t optlen;
if (cp == ep)
return;
while (cp < ep) {
if (ep - cp < sizeof(*dh6o))
goto trunc;
dh6o = (struct dhcp6opt *)cp;
optlen = ntohs(dh6o->dh6opt_len);
if (ep - cp < sizeof(*dh6o) + optlen)
goto trunc;
switch (ntohs(dh6o->dh6opt_type)) {
case DH6OPT_DUID:
printf(" (duid"); /*)*/
if (optlen < 2) {
/*(*/
printf(" ??)");
break;
}
tp = (u_char *)(dh6o + 1);
switch (ntohs(*(u_int16_t *)tp)) {
case 1:
if (optlen >= 2 + 6) {
printf(" hwaddr/time time %u type %u ",
ntohl(*(u_int32_t *)&tp[2]),
ntohs(*(u_int16_t *)&tp[6]));
for (i = 8; i < optlen; i++)
printf("%02x", tp[i]);
/*(*/
printf(")");
} else {
/*(*/
printf(" ??)");
}
break;
case 2:
if (optlen >= 2 + 8) {
printf(" vid ");
for (i = 2; i < 2 + 8; i++)
printf("%02x", tp[i]);
/*(*/
printf(")");
} else {
/*(*/
printf(" ??)");
}
break;
case 3:
if (optlen >= 2 + 2) {
printf(" hwaddr type %u ",
ntohs(*(u_int16_t *)&tp[2]));
for (i = 4; i < optlen; i++)
printf("%02x", tp[i]);
/*(*/
printf(")");
} else {
/*(*/
printf(" ??)");
}
}
break;
case DH6OPT_DNS:
printf(" (dnsserver"); /*)*/
if (optlen % 16) {
/*(*/
printf(" ??)");
break;
}
tp = (u_char *)(dh6o + 1);
for (i = 0; i < optlen; i += 16)
printf(" %s", ip6addr_string(&tp[i]));
/*(*/
printf(")");
default:
printf(" (opt-%u)", ntohs(dh6o->dh6opt_type));
break;
}
cp += sizeof(*dh6o) + optlen;
}
return;
trunc:
printf("[|dhcp6ext]");
}
/*
* Print dhcp6 packets
*/
void
dhcp6_print(register const u_char *cp, u_int length,
u_int16_t sport, u_int16_t dport)
{
struct dhcp6 *dh6;
u_char *ep;
u_char *extp;
const char *name;
printf("dhcp6");
ep = (u_char *)snapend;
dh6 = (struct dhcp6 *)cp;
TCHECK(dh6->dh6_servaddr);
switch (dh6->dh6_msgtype) {
case DH6_REPLY:
name = "reply";
break;
case DH6_INFORM_REQ:
name= "inf-req";
break;
default:
name = NULL;
break;
}
if (!vflag) {
if (name)
printf(" %s", name);
else
printf(" msgtype-%u", dh6->dh6_msgtype);
return;
}
/* XXX relay agent messages have to be handled differently */
if (name)
printf(" %s (", name); /*)*/
else
printf(" msgtype-%u (", dh6->dh6_msgtype); /*)*/
printf("xid=%x", ntohl(dh6->dh6_xid) & DH6_XIDMASK);
printf(" server=%s", ip6addr_string(&dh6->dh6_servaddr));
extp = (u_char *)(dh6 + 1);
dhcp6opt_print(extp, ep);
/*(*/
printf(")");
return;
trunc:
printf("[|dhcp6]");
}
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