/*
* Copyright (C) 2001 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: BIND9 Lightweight Resolver protocol printer */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "nameser.h"
/* BIND9 lib/lwres/include/lwres */
/*
* Use nd_uint16_t for lwres_uint16_t
* Use nd_uint32_t for lwres_uint32_t
*/
struct lwres_lwpacket {
nd_uint32_t length;
nd_uint16_t version;
nd_uint16_t pktflags;
nd_uint32_t serial;
nd_uint32_t opcode;
nd_uint32_t result;
nd_uint32_t recvlength;
nd_uint16_t authtype;
nd_uint16_t authlength;
};
#define LWRES_LWPACKETFLAG_RESPONSE 0x0001U /* if set, pkt is a response */
#define LWRES_LWPACKETVERSION_0 0
#define LWRES_FLAG_TRUSTNOTREQUIRED 0x00000001U
#define LWRES_FLAG_SECUREDATA 0x00000002U
/*
* no-op
*/
#define LWRES_OPCODE_NOOP 0x00000000U
typedef struct {
/* public */
nd_uint16_t datalength;
/* data follows */
} lwres_nooprequest_t;
typedef struct {
/* public */
nd_uint16_t datalength;
/* data follows */
} lwres_noopresponse_t;
/*
* get addresses by name
*/
#define LWRES_OPCODE_GETADDRSBYNAME 0x00010001U
typedef struct lwres_addr lwres_addr_t;
struct lwres_addr {
nd_uint32_t family;
nd_uint16_t length;
/* address follows */
};
#define LWRES_ADDR_LEN 6
typedef struct {
/* public */
nd_uint32_t flags;
nd_uint32_t addrtypes;
nd_uint16_t namelen;
/* name follows */
} lwres_gabnrequest_t;
#define LWRES_GABNREQUEST_LEN 10
typedef struct {
/* public */
nd_uint32_t flags;
nd_uint16_t naliases;
nd_uint16_t naddrs;
nd_uint16_t realnamelen;
/* aliases follows */
/* addrs follows */
/* realname follows */
} lwres_gabnresponse_t;
#define LWRES_GABNRESPONSE_LEN 10
/*
* get name by address
*/
#define LWRES_OPCODE_GETNAMEBYADDR 0x00010002U
typedef struct {
/* public */
nd_uint32_t flags;
/* addr follows */
} lwres_gnbarequest_t;
#define LWRES_GNBAREQUEST_LEN 4
typedef struct {
/* public */
nd_uint32_t flags;
nd_uint16_t naliases;
nd_uint16_t realnamelen;
/* aliases follows */
/* realname follows */
} lwres_gnbaresponse_t;
#define LWRES_GNBARESPONSE_LEN 8
/*
* get rdata by name
*/
#define LWRES_OPCODE_GETRDATABYNAME 0x00010003U
typedef struct {
/* public */
nd_uint32_t flags;
nd_uint16_t rdclass;
nd_uint16_t rdtype;
nd_uint16_t namelen;
/* name follows */
} lwres_grbnrequest_t;
#define LWRES_GRBNREQUEST_LEN 10
typedef struct {
/* public */
nd_uint32_t flags;
nd_uint16_t rdclass;
nd_uint16_t rdtype;
nd_uint32_t ttl;
nd_uint16_t nrdatas;
nd_uint16_t nsigs;
/* realname here (len + name) */
/* rdata here (len + name) */
/* signatures here (len + name) */
} lwres_grbnresponse_t;
#define LWRES_GRBNRESPONSE_LEN 16
#define LWRDATA_VALIDATED 0x00000001
#define LWRES_ADDRTYPE_V4 0x00000001U /* ipv4 */
#define LWRES_ADDRTYPE_V6 0x00000002U /* ipv6 */
#define LWRES_MAX_ALIASES 16 /* max # of aliases */
#define LWRES_MAX_ADDRS 64 /* max # of addrs */
static const struct tok opcode[] = {
{ LWRES_OPCODE_NOOP, "noop", },
{ LWRES_OPCODE_GETADDRSBYNAME, "getaddrsbyname", },
{ LWRES_OPCODE_GETNAMEBYADDR, "getnamebyaddr", },
{ LWRES_OPCODE_GETRDATABYNAME, "getrdatabyname", },
{ 0, NULL, },
};
/* print-domain.c */
extern const struct tok ns_type2str[];
extern const struct tok ns_class2str[];
static unsigned
lwres_printname(netdissect_options *ndo,
size_t l, const u_char *p0)
{
ND_PRINT(" ");
(void)nd_printn(ndo, p0, l, NULL);
p0 += l;
if (GET_U_1(p0))
ND_PRINT(" (not NUL-terminated!)");
return l + 1;
}
static unsigned
lwres_printnamelen(netdissect_options *ndo,
const u_char *p)
{
uint16_t l;
int advance;
l = GET_BE_U_2(p);
advance = lwres_printname(ndo, l, p + 2);
return 2 + advance;
}
static unsigned
lwres_printbinlen(netdissect_options *ndo,
const u_char *p0)
{
const u_char *p;
uint16_t l;
int i;
p = p0;
l = GET_BE_U_2(p);
p += 2;
for (i = 0; i < l; i++) {
ND_PRINT("%02x", GET_U_1(p));
p++;
}
return 2 + l;
}
static int
lwres_printaddr(netdissect_options *ndo,
const u_char *p0)
{
const u_char *p;
const lwres_addr_t *ap;
uint16_t l;
int i;
p = p0;
ap = (const lwres_addr_t *)p;
l = GET_BE_U_2(ap->length);
p += LWRES_ADDR_LEN;
ND_TCHECK_LEN(p, l);
switch (GET_BE_U_4(ap->family)) {
case 1: /* IPv4 */
if (l < 4)
return -1;
ND_PRINT(" %s", GET_IPADDR_STRING(p));
p += sizeof(nd_ipv4);
break;
case 2: /* IPv6 */
if (l < 16)
return -1;
ND_PRINT(" %s", GET_IP6ADDR_STRING(p));
p += sizeof(nd_ipv6);
break;
default:
ND_PRINT(" %u/", GET_BE_U_4(ap->family));
for (i = 0; i < l; i++) {
ND_PRINT("%02x", GET_U_1(p));
p++;
}
}
return ND_BYTES_BETWEEN(p, p0);
}
void
lwres_print(netdissect_options *ndo,
const u_char *bp, u_int length)
{
const u_char *p;
const struct lwres_lwpacket *np;
uint32_t v;
const u_char *s;
int response;
int advance;
int unsupported = 0;
ndo->ndo_protocol = "lwres";
np = (const struct lwres_lwpacket *)bp;
ND_TCHECK_2(np->authlength);
ND_PRINT(" lwres");
v = GET_BE_U_2(np->version);
if (ndo->ndo_vflag || v != LWRES_LWPACKETVERSION_0)
ND_PRINT(" v%u", v);
if (v != LWRES_LWPACKETVERSION_0) {
s = bp + GET_BE_U_4(np->length);
goto tail;
}
response = GET_BE_U_2(np->pktflags) & LWRES_LWPACKETFLAG_RESPONSE;
/* opcode and pktflags */
v = GET_BE_U_4(np->opcode);
ND_PRINT(" %s%s", tok2str(opcode, "#0x%x", v), response ? "" : "?");
/* pktflags */
v = GET_BE_U_2(np->pktflags);
if (v & ~LWRES_LWPACKETFLAG_RESPONSE)
ND_PRINT("[0x%x]", v);
if (ndo->ndo_vflag > 1) {
ND_PRINT(" ("); /*)*/
ND_PRINT("serial:0x%x", GET_BE_U_4(np->serial));
ND_PRINT(" result:0x%x", GET_BE_U_4(np->result));
ND_PRINT(" recvlen:%u", GET_BE_U_4(np->recvlength));
/* BIND910: not used */
if (ndo->ndo_vflag > 2) {
ND_PRINT(" authtype:0x%x", GET_BE_U_2(np->authtype));
ND_PRINT(" authlen:%u", GET_BE_U_2(np->authlength));
}
/*(*/
ND_PRINT(")");
}
/* per-opcode content */
if (!response) {
/*
* queries
*/
const lwres_gabnrequest_t *gabn;
const lwres_gnbarequest_t *gnba;
const lwres_grbnrequest_t *grbn;
uint32_t l;
gabn = NULL;
gnba = NULL;
grbn = NULL;
p = (const u_char *)(np + 1);
switch (GET_BE_U_4(np->opcode)) {
case LWRES_OPCODE_NOOP:
s = p;
break;
case LWRES_OPCODE_GETADDRSBYNAME:
gabn = (const lwres_gabnrequest_t *)p;
ND_TCHECK_2(gabn->namelen);
/* BIND910: not used */
if (ndo->ndo_vflag > 2) {
ND_PRINT(" flags:0x%x",
GET_BE_U_4(gabn->flags));
}
v = GET_BE_U_4(gabn->addrtypes);
switch (v & (LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6)) {
case LWRES_ADDRTYPE_V4:
ND_PRINT(" IPv4");
break;
case LWRES_ADDRTYPE_V6:
ND_PRINT(" IPv6");
break;
case LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6:
ND_PRINT(" IPv4/6");
break;
}
if (v & ~(LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6))
ND_PRINT("[0x%x]", v);
s = p + LWRES_GABNREQUEST_LEN;
l = GET_BE_U_2(gabn->namelen);
advance = lwres_printname(ndo, l, s);
s += advance;
break;
case LWRES_OPCODE_GETNAMEBYADDR:
gnba = (const lwres_gnbarequest_t *)p;
ND_TCHECK_4(gnba->flags);
/* BIND910: not used */
if (ndo->ndo_vflag > 2) {
ND_PRINT(" flags:0x%x",
GET_BE_U_4(gnba->flags));
}
s = p + LWRES_GNBAREQUEST_LEN;
advance = lwres_printaddr(ndo, s);
if (advance < 0)
goto invalid;
s += advance;
break;
case LWRES_OPCODE_GETRDATABYNAME:
/* XXX no trace, not tested */
grbn = (const lwres_grbnrequest_t *)p;
ND_TCHECK_2(grbn->namelen);
/* BIND910: not used */
if (ndo->ndo_vflag > 2) {
ND_PRINT(" flags:0x%x",
GET_BE_U_4(grbn->flags));
}
ND_PRINT(" %s", tok2str(ns_type2str, "Type%u",
GET_BE_U_2(grbn->rdtype)));
if (GET_BE_U_2(grbn->rdclass) != C_IN) {
ND_PRINT(" %s", tok2str(ns_class2str, "Class%u",
GET_BE_U_2(grbn->rdclass)));
}
s = p + LWRES_GRBNREQUEST_LEN;
l = GET_BE_U_2(grbn->namelen);
advance = lwres_printname(ndo, l, s);
s += advance;
break;
default:
s = p;
unsupported++;
break;
}
} else {
/*
* responses
*/
const lwres_gabnresponse_t *gabn;
const lwres_gnbaresponse_t *gnba;
const lwres_grbnresponse_t *grbn;
uint32_t l, na;
uint32_t i;
gabn = NULL;
gnba = NULL;
grbn = NULL;
p = (const u_char *)(np + 1);
switch (GET_BE_U_4(np->opcode)) {
case LWRES_OPCODE_NOOP:
s = p;
break;
case LWRES_OPCODE_GETADDRSBYNAME:
gabn = (const lwres_gabnresponse_t *)p;
ND_TCHECK_2(gabn->realnamelen);
/* BIND910: not used */
if (ndo->ndo_vflag > 2) {
ND_PRINT(" flags:0x%x",
GET_BE_U_4(gabn->flags));
}
ND_PRINT(" %u/%u", GET_BE_U_2(gabn->naliases),
GET_BE_U_2(gabn->naddrs));
s = p + LWRES_GABNRESPONSE_LEN;
l = GET_BE_U_2(gabn->realnamelen);
advance = lwres_printname(ndo, l, s);
s += advance;
/* aliases */
na = GET_BE_U_2(gabn->naliases);
for (i = 0; i < na; i++) {
advance = lwres_printnamelen(ndo, s);
s += advance;
}
/* addrs */
na = GET_BE_U_2(gabn->naddrs);
for (i = 0; i < na; i++) {
advance = lwres_printaddr(ndo, s);
if (advance < 0)
goto invalid;
s += advance;
}
break;
case LWRES_OPCODE_GETNAMEBYADDR:
gnba = (const lwres_gnbaresponse_t *)p;
ND_TCHECK_2(gnba->realnamelen);
/* BIND910: not used */
if (ndo->ndo_vflag > 2) {
ND_PRINT(" flags:0x%x",
GET_BE_U_4(gnba->flags));
}
ND_PRINT(" %u", GET_BE_U_2(gnba->naliases));
s = p + LWRES_GNBARESPONSE_LEN;
l = GET_BE_U_2(gnba->realnamelen);
advance = lwres_printname(ndo, l, s);
s += advance;
/* aliases */
na = GET_BE_U_2(gnba->naliases);
for (i = 0; i < na; i++) {
advance = lwres_printnamelen(ndo, s);
s += advance;
}
break;
case LWRES_OPCODE_GETRDATABYNAME:
/* XXX no trace, not tested */
grbn = (const lwres_grbnresponse_t *)p;
ND_TCHECK_2(grbn->nsigs);
/* BIND910: not used */
if (ndo->ndo_vflag > 2) {
ND_PRINT(" flags:0x%x",
GET_BE_U_4(grbn->flags));
}
ND_PRINT(" %s", tok2str(ns_type2str, "Type%u",
GET_BE_U_2(grbn->rdtype)));
if (GET_BE_U_2(grbn->rdclass) != C_IN) {
ND_PRINT(" %s", tok2str(ns_class2str, "Class%u",
GET_BE_U_2(grbn->rdclass)));
}
ND_PRINT(" TTL ");
unsigned_relts_print(ndo,
GET_BE_U_4(grbn->ttl));
ND_PRINT(" %u/%u", GET_BE_U_2(grbn->nrdatas),
GET_BE_U_2(grbn->nsigs));
s = p + LWRES_GRBNRESPONSE_LEN;
advance = lwres_printnamelen(ndo, s);
s += advance;
/* rdatas */
na = GET_BE_U_2(grbn->nrdatas);
for (i = 0; i < na; i++) {
/* XXX should decode resource data */
advance = lwres_printbinlen(ndo, s);
s += advance;
}
/* sigs */
na = GET_BE_U_2(grbn->nsigs);
for (i = 0; i < na; i++) {
/* XXX how should we print it? */
advance = lwres_printbinlen(ndo, s);
s += advance;
}
break;
default:
s = p;
unsupported++;
break;
}
}
tail:
/* length mismatch */
if (GET_BE_U_4(np->length) != length) {
ND_PRINT(" [len: %u != %u]", GET_BE_U_4(np->length),
length);
}
if (!unsupported && s < bp + GET_BE_U_4(np->length))
ND_PRINT("[extra]");
return;
invalid:
nd_print_invalid(ndo);
}