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6df678ca31
tcpdump/print-dhcp6.c
Guy Harris 40185ca67a Discard result of fn_printn() calls. 
We've already done checks to see whether we'll run past the end of the
packet, so there's no need to see whether fn_printn() did so.

Squelches some Coverity complaints.
2017-01-18 09:16:42 +01:00

829 lines
23 KiB
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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.
*/
/* \summary: IPv6 DHCP printer */
/*
* RFC3315: DHCPv6
* supported DHCPv6 options:
* RFC3319: Session Initiation Protocol (SIP) Servers options,
* RFC3633: IPv6 Prefix options,
* RFC3646: DNS Configuration options,
* RFC3898: Network Information Service (NIS) Configuration options,
* RFC4075: Simple Network Time Protocol (SNTP) Configuration option,
* RFC4242: Information Refresh Time option,
* RFC4280: Broadcast and Multicast Control Servers options,
* RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6
* RFC6334: Dual-Stack Lite option,
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include <stdio.h>
#include <string.h>
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
/* lease duration */
#define DHCP6_DURATION_INFINITE 0xffffffff
/* 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_SOLICIT 1
#define DH6_ADVERTISE 2
#define DH6_REQUEST 3
#define DH6_CONFIRM 4
#define DH6_RENEW 5
#define DH6_REBIND 6
#define DH6_REPLY 7
#define DH6_RELEASE 8
#define DH6_DECLINE 9
#define DH6_RECONFIGURE 10
#define DH6_INFORM_REQ 11
#define DH6_RELAY_FORW 12
#define DH6_RELAY_REPLY 13
#define DH6_LEASEQUERY 14
#define DH6_LQ_REPLY 15
static const struct tok dh6_msgtype_str[] = {
{ DH6_SOLICIT, "solicit" },
{ DH6_ADVERTISE, "advertise" },
{ DH6_REQUEST, "request" },
{ DH6_CONFIRM, "confirm" },
{ DH6_RENEW, "renew" },
{ DH6_REBIND, "rebind" },
{ DH6_REPLY, "reply" },
{ DH6_RELEASE, "release" },
{ DH6_DECLINE, "decline" },
{ DH6_RECONFIGURE, "reconfigure" },
{ DH6_INFORM_REQ, "inf-req" },
{ DH6_RELAY_FORW, "relay-fwd" },
{ DH6_RELAY_REPLY, "relay-reply" },
{ DH6_LEASEQUERY, "leasequery" },
{ DH6_LQ_REPLY, "leasequery-reply" },
{ 0, NULL }
};
/* DHCP6 base packet format */
struct dhcp6 {
union {
nd_uint8_t m;
nd_uint32_t x;
} dh6_msgtypexid;
/* options follow */
};
#define dh6_msgtype dh6_msgtypexid.m
#define dh6_xid dh6_msgtypexid.x
#define DH6_XIDMASK 0x00ffffff
/* DHCPv6 relay messages */
struct dhcp6_relay {
nd_uint8_t dh6relay_msgtype;
nd_uint8_t dh6relay_hcnt;
nd_uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
nd_uint8_t dh6relay_peeraddr[16];
/* options follow */
};
/* options */
#define DH6OPT_CLIENTID 1
#define DH6OPT_SERVERID 2
#define DH6OPT_IA_NA 3
#define DH6OPT_IA_TA 4
#define DH6OPT_IA_ADDR 5
#define DH6OPT_ORO 6
#define DH6OPT_PREFERENCE 7
# define DH6OPT_PREF_MAX 255
#define DH6OPT_ELAPSED_TIME 8
#define DH6OPT_RELAY_MSG 9
/*#define DH6OPT_SERVER_MSG 10 deprecated */
#define DH6OPT_AUTH 11
# define DH6OPT_AUTHPROTO_DELAYED 2
# define DH6OPT_AUTHPROTO_RECONFIG 3
# define DH6OPT_AUTHALG_HMACMD5 1
# define DH6OPT_AUTHRDM_MONOCOUNTER 0
# define DH6OPT_AUTHRECONFIG_KEY 1
# define DH6OPT_AUTHRECONFIG_HMACMD5 2
#define DH6OPT_UNICAST 12
#define DH6OPT_STATUS_CODE 13
# define DH6OPT_STCODE_SUCCESS 0
# define DH6OPT_STCODE_UNSPECFAIL 1
# define DH6OPT_STCODE_NOADDRAVAIL 2
# define DH6OPT_STCODE_NOBINDING 3
# define DH6OPT_STCODE_NOTONLINK 4
# define DH6OPT_STCODE_USEMULTICAST 5
# define DH6OPT_STCODE_NOPREFIXAVAIL 6
# define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
# define DH6OPT_STCODE_MALFORMEDQUERY 8
# define DH6OPT_STCODE_NOTCONFIGURED 9
# define DH6OPT_STCODE_NOTALLOWED 10
#define DH6OPT_RAPID_COMMIT 14
#define DH6OPT_USER_CLASS 15
#define DH6OPT_VENDOR_CLASS 16
#define DH6OPT_VENDOR_OPTS 17
#define DH6OPT_INTERFACE_ID 18
#define DH6OPT_RECONF_MSG 19
#define DH6OPT_RECONF_ACCEPT 20
#define DH6OPT_SIP_SERVER_D 21
#define DH6OPT_SIP_SERVER_A 22
#define DH6OPT_DNS_SERVERS 23
#define DH6OPT_DOMAIN_LIST 24
#define DH6OPT_IA_PD 25
#define DH6OPT_IA_PD_PREFIX 26
#define DH6OPT_NIS_SERVERS 27
#define DH6OPT_NISP_SERVERS 28
#define DH6OPT_NIS_NAME 29
#define DH6OPT_NISP_NAME 30
#define DH6OPT_SNTP_SERVERS 31
#define DH6OPT_LIFETIME 32
#define DH6OPT_BCMCS_SERVER_D 33
#define DH6OPT_BCMCS_SERVER_A 34
#define DH6OPT_GEOCONF_CIVIC 36
#define DH6OPT_REMOTE_ID 37
#define DH6OPT_SUBSCRIBER_ID 38
#define DH6OPT_CLIENT_FQDN 39
#define DH6OPT_PANA_AGENT 40
#define DH6OPT_NEW_POSIX_TIMEZONE 41
#define DH6OPT_NEW_TZDB_TIMEZONE 42
#define DH6OPT_ERO 43
#define DH6OPT_LQ_QUERY 44
#define DH6OPT_CLIENT_DATA 45
#define DH6OPT_CLT_TIME 46
#define DH6OPT_LQ_RELAY_DATA 47
#define DH6OPT_LQ_CLIENT_LINK 48
#define DH6OPT_NTP_SERVER 56
# define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
# define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
# define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
#define DH6OPT_AFTR_NAME 64
#define DH6OPT_MUDURL 112
static const struct tok dh6opt_str[] = {
{ DH6OPT_CLIENTID, "client-ID" },
{ DH6OPT_SERVERID, "server-ID" },
{ DH6OPT_IA_NA, "IA_NA" },
{ DH6OPT_IA_TA, "IA_TA" },
{ DH6OPT_IA_ADDR, "IA_ADDR" },
{ DH6OPT_ORO, "option-request" },
{ DH6OPT_PREFERENCE, "preference" },
{ DH6OPT_ELAPSED_TIME, "elapsed-time" },
{ DH6OPT_RELAY_MSG, "relay-message" },
{ DH6OPT_AUTH, "authentication" },
{ DH6OPT_UNICAST, "server-unicast" },
{ DH6OPT_STATUS_CODE, "status-code" },
{ DH6OPT_RAPID_COMMIT, "rapid-commit" },
{ DH6OPT_USER_CLASS, "user-class" },
{ DH6OPT_VENDOR_CLASS, "vendor-class" },
{ DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
{ DH6OPT_INTERFACE_ID, "interface-ID" },
{ DH6OPT_RECONF_MSG, "reconfigure-message" },
{ DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
{ DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
{ DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
{ DH6OPT_DNS_SERVERS, "DNS-server" },
{ DH6OPT_DOMAIN_LIST, "DNS-search-list" },
{ DH6OPT_IA_PD, "IA_PD" },
{ DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
{ DH6OPT_SNTP_SERVERS, "SNTP-servers" },
{ DH6OPT_LIFETIME, "lifetime" },
{ DH6OPT_NIS_SERVERS, "NIS-server" },
{ DH6OPT_NISP_SERVERS, "NIS+-server" },
{ DH6OPT_NIS_NAME, "NIS-domain-name" },
{ DH6OPT_NISP_NAME, "NIS+-domain-name" },
{ DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
{ DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
{ DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
{ DH6OPT_REMOTE_ID, "Remote-ID" },
{ DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
{ DH6OPT_CLIENT_FQDN, "Client-FQDN" },
{ DH6OPT_PANA_AGENT, "PANA-agent" },
{ DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
{ DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
{ DH6OPT_ERO, "Echo-request-option" },
{ DH6OPT_LQ_QUERY, "Lease-query" },
{ DH6OPT_CLIENT_DATA, "LQ-client-data" },
{ DH6OPT_CLT_TIME, "Clt-time" },
{ DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
{ DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
{ DH6OPT_NTP_SERVER, "NTP-server" },
{ DH6OPT_AFTR_NAME, "AFTR-Name" },
{ DH6OPT_MUDURL, "MUD-URL" },
{ 0, NULL }
};
static const struct tok dh6opt_stcode_str[] = {
{ DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
{ DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
{ DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
{ DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
{ DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
{ DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
{ DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
{ DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
{ DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
{ DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
{ DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
{ 0, NULL }
};
struct dhcp6opt {
nd_uint16_t dh6opt_type;
nd_uint16_t dh6opt_len;
/* type-dependent data follows */
};
static const char *
dhcp6stcode(const uint16_t code)
{
return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
}
static void
dhcp6opt_print(netdissect_options *ndo,
const u_char *cp, const u_char *ep)
{
const struct dhcp6opt *dh6o;
const u_char *tp;
size_t i;
uint16_t opttype;
size_t optlen;
uint8_t auth_proto;
u_int authinfolen, authrealmlen;
int remain_len; /* Length of remaining options */
int label_len; /* Label length */
uint16_t subopt_code;
uint16_t subopt_len;
if (cp == ep)
return;
while (cp < ep) {
if (ep < cp + sizeof(*dh6o))
goto trunc;
dh6o = (const struct dhcp6opt *)cp;
ND_TCHECK(*dh6o);
optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
if (ep < cp + sizeof(*dh6o) + optlen)
goto trunc;
opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype)));
ND_TCHECK2(*(cp + sizeof(*dh6o)), optlen);
switch (opttype) {
case DH6OPT_CLIENTID:
case DH6OPT_SERVERID:
if (optlen < 2) {
/*(*/
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
switch (EXTRACT_16BITS(tp)) {
case 1:
if (optlen >= 2 + 6) {
ND_PRINT((ndo, " hwaddr/time type %u time %u ",
EXTRACT_16BITS(&tp[2]),
EXTRACT_32BITS(&tp[4])));
for (i = 8; i < optlen; i++)
ND_PRINT((ndo, "%02x", tp[i]));
/*(*/
ND_PRINT((ndo, ")"));
} else {
/*(*/
ND_PRINT((ndo, " ?)"));
}
break;
case 2:
if (optlen >= 2 + 8) {
ND_PRINT((ndo, " vid "));
for (i = 2; i < 2 + 8; i++)
ND_PRINT((ndo, "%02x", tp[i]));
/*(*/
ND_PRINT((ndo, ")"));
} else {
/*(*/
ND_PRINT((ndo, " ?)"));
}
break;
case 3:
if (optlen >= 2 + 2) {
ND_PRINT((ndo, " hwaddr type %u ",
EXTRACT_16BITS(&tp[2])));
for (i = 4; i < optlen; i++)
ND_PRINT((ndo, "%02x", tp[i]));
/*(*/
ND_PRINT((ndo, ")"));
} else {
/*(*/
ND_PRINT((ndo, " ?)"));
}
break;
default:
ND_PRINT((ndo, " type %d)", EXTRACT_16BITS(tp)));
break;
}
break;
case DH6OPT_IA_ADDR:
if (optlen < 24) {
/*(*/
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
ND_PRINT((ndo, " pltime:%u vltime:%u",
EXTRACT_32BITS(&tp[16]),
EXTRACT_32BITS(&tp[20])));
if (optlen > 24) {
/* there are sub-options */
dhcp6opt_print(ndo, tp + 24, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_ORO:
case DH6OPT_ERO:
if (optlen % 2) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
for (i = 0; i < optlen; i += 2) {
ND_PRINT((ndo, " %s",
tok2str(dh6opt_str, "opt_%u", EXTRACT_16BITS(&tp[i]))));
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_PREFERENCE:
if (optlen != 1) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", *tp));
break;
case DH6OPT_ELAPSED_TIME:
if (optlen != 2) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", EXTRACT_16BITS(tp)));
break;
case DH6OPT_RELAY_MSG:
ND_PRINT((ndo, " ("));
tp = (const u_char *)(dh6o + 1);
dhcp6_print(ndo, tp, optlen);
ND_PRINT((ndo, ")"));
break;
case DH6OPT_AUTH:
if (optlen < 11) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
auth_proto = *tp;
switch (auth_proto) {
case DH6OPT_AUTHPROTO_DELAYED:
ND_PRINT((ndo, " proto: delayed"));
break;
case DH6OPT_AUTHPROTO_RECONFIG:
ND_PRINT((ndo, " proto: reconfigure"));
break;
default:
ND_PRINT((ndo, " proto: %d", auth_proto));
break;
}
tp++;
switch (*tp) {
case DH6OPT_AUTHALG_HMACMD5:
/* XXX: may depend on the protocol */
ND_PRINT((ndo, ", alg: HMAC-MD5"));
break;
default:
ND_PRINT((ndo, ", alg: %d", *tp));
break;
}
tp++;
switch (*tp) {
case DH6OPT_AUTHRDM_MONOCOUNTER:
ND_PRINT((ndo, ", RDM: mono"));
break;
default:
ND_PRINT((ndo, ", RDM: %d", *tp));
break;
}
tp++;
ND_PRINT((ndo, ", RD:"));
for (i = 0; i < 4; i++, tp += 2)
ND_PRINT((ndo, " %04x", EXTRACT_16BITS(tp)));
/* protocol dependent part */
authinfolen = optlen - 11;
switch (auth_proto) {
case DH6OPT_AUTHPROTO_DELAYED:
if (authinfolen == 0)
break;
if (authinfolen < 20) {
ND_PRINT((ndo, " ??"));
break;
}
authrealmlen = authinfolen - 20;
if (authrealmlen > 0) {
ND_PRINT((ndo, ", realm: "));
}
for (i = 0; i < authrealmlen; i++, tp++)
ND_PRINT((ndo, "%02x", *tp));
ND_PRINT((ndo, ", key ID: %08x", EXTRACT_32BITS(tp)));
tp += 4;
ND_PRINT((ndo, ", HMAC-MD5:"));
for (i = 0; i < 4; i++, tp+= 4)
ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
break;
case DH6OPT_AUTHPROTO_RECONFIG:
if (authinfolen != 17) {
ND_PRINT((ndo, " ??"));
break;
}
switch (*tp++) {
case DH6OPT_AUTHRECONFIG_KEY:
ND_PRINT((ndo, " reconfig-key"));
break;
case DH6OPT_AUTHRECONFIG_HMACMD5:
ND_PRINT((ndo, " type: HMAC-MD5"));
break;
default:
ND_PRINT((ndo, " type: ??"));
break;
}
ND_PRINT((ndo, " value:"));
for (i = 0; i < 4; i++, tp+= 4)
ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
break;
default:
ND_PRINT((ndo, " ??"));
break;
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_RAPID_COMMIT: /* nothing todo */
ND_PRINT((ndo, ")"));
break;
case DH6OPT_INTERFACE_ID:
case DH6OPT_SUBSCRIBER_ID:
/*
* Since we cannot predict the encoding, print hex dump
* at most 10 characters.
*/
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " "));
for (i = 0; i < optlen && i < 10; i++)
ND_PRINT((ndo, "%02x", tp[i]));
ND_PRINT((ndo, "...)"));
break;
case DH6OPT_RECONF_MSG:
tp = (const u_char *)(dh6o + 1);
switch (*tp) {
case DH6_RENEW:
ND_PRINT((ndo, " for renew)"));
break;
case DH6_INFORM_REQ:
ND_PRINT((ndo, " for inf-req)"));
break;
default:
ND_PRINT((ndo, " for ?\?\?(%02x))", *tp));
break;
}
break;
case DH6OPT_RECONF_ACCEPT: /* nothing todo */
ND_PRINT((ndo, ")"));
break;
case DH6OPT_SIP_SERVER_A:
case DH6OPT_DNS_SERVERS:
case DH6OPT_SNTP_SERVERS:
case DH6OPT_NIS_SERVERS:
case DH6OPT_NISP_SERVERS:
case DH6OPT_BCMCS_SERVER_A:
case DH6OPT_PANA_AGENT:
case DH6OPT_LQ_CLIENT_LINK:
if (optlen % 16) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
for (i = 0; i < optlen; i += 16)
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[i])));
ND_PRINT((ndo, ")"));
break;
case DH6OPT_SIP_SERVER_D:
case DH6OPT_DOMAIN_LIST:
tp = (const u_char *)(dh6o + 1);
while (tp < cp + sizeof(*dh6o) + optlen) {
ND_PRINT((ndo, " "));
if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
goto trunc;
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_STATUS_CODE:
if (optlen < 2) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0]))));
break;
case DH6OPT_IA_NA:
case DH6OPT_IA_PD:
if (optlen < 12) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " IAID:%u T1:%u T2:%u",
EXTRACT_32BITS(&tp[0]),
EXTRACT_32BITS(&tp[4]),
EXTRACT_32BITS(&tp[8])));
if (optlen > 12) {
/* there are sub-options */
dhcp6opt_print(ndo, tp + 12, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_IA_TA:
if (optlen < 4) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " IAID:%u", EXTRACT_32BITS(tp)));
if (optlen > 4) {
/* there are sub-options */
dhcp6opt_print(ndo, tp + 4, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_IA_PD_PREFIX:
if (optlen < 25) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, &tp[9]), tp[8]));
ND_PRINT((ndo, " pltime:%u vltime:%u",
EXTRACT_32BITS(&tp[0]),
EXTRACT_32BITS(&tp[4])));
if (optlen > 25) {
/* there are sub-options */
dhcp6opt_print(ndo, tp + 25, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_LIFETIME:
case DH6OPT_CLT_TIME:
if (optlen != 4) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", EXTRACT_32BITS(tp)));
break;
case DH6OPT_REMOTE_ID:
if (optlen < 4) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d ", EXTRACT_32BITS(tp)));
/*
* Print hex dump first 10 characters.
*/
for (i = 4; i < optlen && i < 14; i++)
ND_PRINT((ndo, "%02x", tp[i]));
ND_PRINT((ndo, "...)"));
break;
case DH6OPT_LQ_QUERY:
if (optlen < 17) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
switch (*tp) {
case 1:
ND_PRINT((ndo, " by-address"));
break;
case 2:
ND_PRINT((ndo, " by-clientID"));
break;
default:
ND_PRINT((ndo, " type_%d", (int)*tp));
break;
}
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[1])));
if (optlen > 17) {
/* there are query-options */
dhcp6opt_print(ndo, tp + 17, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_CLIENT_DATA:
tp = (const u_char *)(dh6o + 1);
if (optlen > 0) {
/* there are encapsulated options */
dhcp6opt_print(ndo, tp, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_LQ_RELAY_DATA:
if (optlen < 16) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s ", ip6addr_string(ndo, &tp[0])));
/*
* Print hex dump first 10 characters.
*/
for (i = 16; i < optlen && i < 26; i++)
ND_PRINT((ndo, "%02x", tp[i]));
ND_PRINT((ndo, "...)"));
break;
case DH6OPT_NTP_SERVER:
if (optlen < 4) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
while (tp < cp + sizeof(*dh6o) + optlen - 4) {
subopt_code = EXTRACT_16BITS(tp);
tp += 2;
subopt_len = EXTRACT_16BITS(tp);
tp += 2;
if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
goto trunc;
ND_PRINT((ndo, " subopt:%d", subopt_code));
switch (subopt_code) {
case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
case DH6OPT_NTP_SUBOPTION_MC_ADDR:
if (subopt_len != 16) {
ND_PRINT((ndo, " ?"));
break;
}
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
break;
case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
ND_PRINT((ndo, " "));
if (ns_nprint(ndo, tp, tp + subopt_len) == NULL)
goto trunc;
break;
default:
ND_PRINT((ndo, " ?"));
break;
}
tp += subopt_len;
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_AFTR_NAME:
if (optlen < 3) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
remain_len = optlen;
ND_PRINT((ndo, " "));
/* Encoding is described in section 3.1 of RFC 1035 */
while (remain_len && *tp) {
label_len = *tp++;
if (label_len < remain_len - 1) {
(void)fn_printn(ndo, tp, label_len, NULL);
tp += label_len;
remain_len -= (label_len + 1);
if(*tp) ND_PRINT((ndo, "."));
} else {
ND_PRINT((ndo, " ?"));
break;
}
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
case DH6OPT_MUDURL: /* although GMT might not work */
if (optlen < 5) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (const u_char *)(dh6o + 1);
ND_PRINT((ndo, "="));
(void)fn_printn(ndo, tp, (u_int)optlen, NULL);
ND_PRINT((ndo, ")"));
break;
default:
ND_PRINT((ndo, ")"));
break;
}
cp += sizeof(*dh6o) + optlen;
}
return;
trunc:
ND_PRINT((ndo, "[|dhcp6ext]"));
}
/*
* Print dhcp6 packets
*/
void
dhcp6_print(netdissect_options *ndo,
const u_char *cp, u_int length)
{
const struct dhcp6 *dh6;
const struct dhcp6_relay *dh6relay;
const u_char *ep;
const u_char *extp;
const char *name;
ND_PRINT((ndo, "dhcp6"));
ep = (const u_char *)ndo->ndo_snapend;
if (cp + length < ep)
ep = cp + length;
dh6 = (const struct dhcp6 *)cp;
dh6relay = (const struct dhcp6_relay *)cp;
ND_TCHECK(dh6->dh6_xid);
name = tok2str(dh6_msgtype_str, "msgtype-%u", dh6->dh6_msgtype);
if (!ndo->ndo_vflag) {
ND_PRINT((ndo, " %s", name));
return;
}
/* XXX relay agent messages have to be handled differently */
ND_PRINT((ndo, " %s (", name)); /*)*/
if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
dh6->dh6_msgtype != DH6_RELAY_REPLY) {
ND_PRINT((ndo, "xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK));
extp = (const u_char *)(dh6 + 1);
dhcp6opt_print(ndo, extp, ep);
} else { /* relay messages */
struct in6_addr addr6;
ND_TCHECK(dh6relay->dh6relay_peeraddr);
memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
ND_PRINT((ndo, "linkaddr=%s", ip6addr_string(ndo, &addr6)));
memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6)));
dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
}
/*(*/
ND_PRINT((ndo, ")"));
return;
trunc:
ND_PRINT((ndo, "[|dhcp6]"));
}
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