mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-12 19:33:43 +08:00
d07e352f5a
Have separate routines for signed and unsigned relative time stamps. Have the routine for signed time stamps handle the case of -2^31, where you can't negate it and have the result fit in a 32-bit signed integer. There are currently no users of the signed relative time stamp routine, but it's there in case anybody needs it (and is passing 32-bit quantitites, so that there's a risk that a packet might contain -2^31 as the time stamp). Fixes an array overflow found with American Fuzzy Lop by Hanno Böck.
596 lines
14 KiB
C
596 lines
14 KiB
C
/*
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* Copyright (C) 2001 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* \summary: BIND9 Lightweight Resolver protocol printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include "nameser.h"
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#include <stdio.h>
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#include <string.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "extract.h"
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/* BIND9 lib/lwres/include/lwres */
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typedef uint32_t lwres_uint32_t;
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typedef uint16_t lwres_uint16_t;
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typedef uint8_t lwres_uint8_t;
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struct lwres_lwpacket {
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lwres_uint32_t length;
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lwres_uint16_t version;
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lwres_uint16_t pktflags;
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lwres_uint32_t serial;
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lwres_uint32_t opcode;
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lwres_uint32_t result;
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lwres_uint32_t recvlength;
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lwres_uint16_t authtype;
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lwres_uint16_t authlength;
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};
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#define LWRES_LWPACKETFLAG_RESPONSE 0x0001U /* if set, pkt is a response */
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#define LWRES_LWPACKETVERSION_0 0
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#define LWRES_FLAG_TRUSTNOTREQUIRED 0x00000001U
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#define LWRES_FLAG_SECUREDATA 0x00000002U
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/*
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* no-op
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*/
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#define LWRES_OPCODE_NOOP 0x00000000U
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typedef struct {
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/* public */
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lwres_uint16_t datalength;
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/* data follows */
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} lwres_nooprequest_t;
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typedef struct {
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/* public */
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lwres_uint16_t datalength;
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/* data follows */
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} lwres_noopresponse_t;
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/*
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* get addresses by name
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*/
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#define LWRES_OPCODE_GETADDRSBYNAME 0x00010001U
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typedef struct lwres_addr lwres_addr_t;
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struct lwres_addr {
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lwres_uint32_t family;
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lwres_uint16_t length;
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/* address folows */
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};
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typedef struct {
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/* public */
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lwres_uint32_t flags;
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lwres_uint32_t addrtypes;
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lwres_uint16_t namelen;
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/* name follows */
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} lwres_gabnrequest_t;
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typedef struct {
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/* public */
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lwres_uint32_t flags;
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lwres_uint16_t naliases;
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lwres_uint16_t naddrs;
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lwres_uint16_t realnamelen;
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/* aliases follows */
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/* addrs follows */
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/* realname follows */
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} lwres_gabnresponse_t;
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/*
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* get name by address
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*/
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#define LWRES_OPCODE_GETNAMEBYADDR 0x00010002U
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typedef struct {
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/* public */
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lwres_uint32_t flags;
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lwres_addr_t addr;
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/* addr body follows */
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} lwres_gnbarequest_t;
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typedef struct {
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/* public */
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lwres_uint32_t flags;
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lwres_uint16_t naliases;
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lwres_uint16_t realnamelen;
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/* aliases follows */
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/* realname follows */
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} lwres_gnbaresponse_t;
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/*
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* get rdata by name
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*/
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#define LWRES_OPCODE_GETRDATABYNAME 0x00010003U
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typedef struct {
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/* public */
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lwres_uint32_t flags;
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lwres_uint16_t rdclass;
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lwres_uint16_t rdtype;
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lwres_uint16_t namelen;
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/* name follows */
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} lwres_grbnrequest_t;
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typedef struct {
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/* public */
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lwres_uint32_t flags;
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lwres_uint16_t rdclass;
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lwres_uint16_t rdtype;
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lwres_uint32_t ttl;
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lwres_uint16_t nrdatas;
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lwres_uint16_t nsigs;
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/* realname here (len + name) */
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/* rdata here (len + name) */
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/* signatures here (len + name) */
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} lwres_grbnresponse_t;
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#define LWRDATA_VALIDATED 0x00000001
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#define LWRES_ADDRTYPE_V4 0x00000001U /* ipv4 */
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#define LWRES_ADDRTYPE_V6 0x00000002U /* ipv6 */
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#define LWRES_MAX_ALIASES 16 /* max # of aliases */
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#define LWRES_MAX_ADDRS 64 /* max # of addrs */
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static const struct tok opcode[] = {
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{ LWRES_OPCODE_NOOP, "noop", },
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{ LWRES_OPCODE_GETADDRSBYNAME, "getaddrsbyname", },
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{ LWRES_OPCODE_GETNAMEBYADDR, "getnamebyaddr", },
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{ LWRES_OPCODE_GETRDATABYNAME, "getrdatabyname", },
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{ 0, NULL, },
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};
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/* print-domain.c */
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extern const struct tok ns_type2str[];
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extern const struct tok ns_class2str[];
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static int
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lwres_printname(netdissect_options *ndo,
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size_t l, const char *p0)
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{
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const char *p;
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size_t i;
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p = p0;
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/* + 1 for terminating \0 */
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if (p + l + 1 > (const char *)ndo->ndo_snapend)
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goto trunc;
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ND_PRINT((ndo, " "));
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for (i = 0; i < l; i++)
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safeputchar(ndo, *p++);
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p++; /* skip terminating \0 */
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return p - p0;
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trunc:
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return -1;
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}
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static int
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lwres_printnamelen(netdissect_options *ndo,
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const char *p)
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{
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uint16_t l;
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int advance;
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if (p + 2 > (const char *)ndo->ndo_snapend)
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goto trunc;
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l = EXTRACT_16BITS(p);
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advance = lwres_printname(ndo, l, p + 2);
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if (advance < 0)
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goto trunc;
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return 2 + advance;
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trunc:
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return -1;
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}
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static int
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lwres_printbinlen(netdissect_options *ndo,
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const char *p0)
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{
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const char *p;
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uint16_t l;
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int i;
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p = p0;
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if (p + 2 > (const char *)ndo->ndo_snapend)
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goto trunc;
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l = EXTRACT_16BITS(p);
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if (p + 2 + l > (const char *)ndo->ndo_snapend)
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goto trunc;
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p += 2;
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for (i = 0; i < l; i++)
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ND_PRINT((ndo, "%02x", *p++));
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return p - p0;
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trunc:
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return -1;
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}
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static int
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lwres_printaddr(netdissect_options *ndo,
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const lwres_addr_t *ap)
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{
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uint16_t l;
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const char *p;
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int i;
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ND_TCHECK(ap->length);
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l = EXTRACT_16BITS(&ap->length);
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/* XXX ap points to packed struct */
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p = (const char *)&ap->length + sizeof(ap->length);
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ND_TCHECK2(*p, l);
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switch (EXTRACT_32BITS(&ap->family)) {
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case 1: /* IPv4 */
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if (l < 4)
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return -1;
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ND_PRINT((ndo, " %s", ipaddr_string(ndo, p)));
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p += sizeof(struct in_addr);
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break;
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case 2: /* IPv6 */
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if (l < 16)
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return -1;
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ND_PRINT((ndo, " %s", ip6addr_string(ndo, p)));
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p += sizeof(struct in6_addr);
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break;
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default:
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ND_PRINT((ndo, " %u/", EXTRACT_32BITS(&ap->family)));
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for (i = 0; i < l; i++)
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ND_PRINT((ndo, "%02x", *p++));
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}
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return p - (const char *)ap;
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trunc:
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return -1;
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}
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void
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lwres_print(netdissect_options *ndo,
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register const u_char *bp, u_int length)
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{
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const struct lwres_lwpacket *np;
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uint32_t v;
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const char *s;
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int response;
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int advance;
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int unsupported = 0;
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np = (const struct lwres_lwpacket *)bp;
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ND_TCHECK(np->authlength);
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ND_PRINT((ndo, " lwres"));
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v = EXTRACT_16BITS(&np->version);
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if (ndo->ndo_vflag || v != LWRES_LWPACKETVERSION_0)
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ND_PRINT((ndo, " v%u", v));
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if (v != LWRES_LWPACKETVERSION_0) {
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s = (const char *)np + EXTRACT_32BITS(&np->length);
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goto tail;
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}
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response = EXTRACT_16BITS(&np->pktflags) & LWRES_LWPACKETFLAG_RESPONSE;
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/* opcode and pktflags */
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v = EXTRACT_32BITS(&np->opcode);
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s = tok2str(opcode, "#0x%x", v);
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ND_PRINT((ndo, " %s%s", s, response ? "" : "?"));
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/* pktflags */
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v = EXTRACT_16BITS(&np->pktflags);
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if (v & ~LWRES_LWPACKETFLAG_RESPONSE)
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ND_PRINT((ndo, "[0x%x]", v));
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if (ndo->ndo_vflag > 1) {
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ND_PRINT((ndo, " (")); /*)*/
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ND_PRINT((ndo, "serial:0x%x", EXTRACT_32BITS(&np->serial)));
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ND_PRINT((ndo, " result:0x%x", EXTRACT_32BITS(&np->result)));
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ND_PRINT((ndo, " recvlen:%u", EXTRACT_32BITS(&np->recvlength)));
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/* BIND910: not used */
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if (ndo->ndo_vflag > 2) {
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ND_PRINT((ndo, " authtype:0x%x", EXTRACT_16BITS(&np->authtype)));
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ND_PRINT((ndo, " authlen:%u", EXTRACT_16BITS(&np->authlength)));
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}
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/*(*/
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ND_PRINT((ndo, ")"));
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}
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/* per-opcode content */
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if (!response) {
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/*
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* queries
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*/
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const lwres_gabnrequest_t *gabn;
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const lwres_gnbarequest_t *gnba;
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const lwres_grbnrequest_t *grbn;
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uint32_t l;
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gabn = NULL;
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gnba = NULL;
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grbn = NULL;
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switch (EXTRACT_32BITS(&np->opcode)) {
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case LWRES_OPCODE_NOOP:
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break;
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case LWRES_OPCODE_GETADDRSBYNAME:
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gabn = (const lwres_gabnrequest_t *)(np + 1);
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ND_TCHECK(gabn->namelen);
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/* XXX gabn points to packed struct */
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s = (const char *)&gabn->namelen +
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sizeof(gabn->namelen);
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l = EXTRACT_16BITS(&gabn->namelen);
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/* BIND910: not used */
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if (ndo->ndo_vflag > 2) {
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ND_PRINT((ndo, " flags:0x%x",
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EXTRACT_32BITS(&gabn->flags)));
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}
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v = EXTRACT_32BITS(&gabn->addrtypes);
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switch (v & (LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6)) {
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case LWRES_ADDRTYPE_V4:
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ND_PRINT((ndo, " IPv4"));
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break;
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case LWRES_ADDRTYPE_V6:
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ND_PRINT((ndo, " IPv6"));
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break;
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case LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6:
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ND_PRINT((ndo, " IPv4/6"));
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break;
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}
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if (v & ~(LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6))
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ND_PRINT((ndo, "[0x%x]", v));
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advance = lwres_printname(ndo, l, s);
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if (advance < 0)
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goto trunc;
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s += advance;
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break;
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case LWRES_OPCODE_GETNAMEBYADDR:
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gnba = (const lwres_gnbarequest_t *)(np + 1);
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ND_TCHECK(gnba->addr);
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/* BIND910: not used */
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if (ndo->ndo_vflag > 2) {
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ND_PRINT((ndo, " flags:0x%x",
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EXTRACT_32BITS(&gnba->flags)));
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}
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s = (const char *)&gnba->addr;
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advance = lwres_printaddr(ndo, &gnba->addr);
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if (advance < 0)
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goto trunc;
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s += advance;
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break;
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case LWRES_OPCODE_GETRDATABYNAME:
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/* XXX no trace, not tested */
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grbn = (const lwres_grbnrequest_t *)(np + 1);
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ND_TCHECK(grbn->namelen);
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/* BIND910: not used */
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if (ndo->ndo_vflag > 2) {
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ND_PRINT((ndo, " flags:0x%x",
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EXTRACT_32BITS(&grbn->flags)));
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}
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ND_PRINT((ndo, " %s", tok2str(ns_type2str, "Type%d",
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EXTRACT_16BITS(&grbn->rdtype))));
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if (EXTRACT_16BITS(&grbn->rdclass) != C_IN) {
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ND_PRINT((ndo, " %s", tok2str(ns_class2str, "Class%d",
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EXTRACT_16BITS(&grbn->rdclass))));
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}
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/* XXX grbn points to packed struct */
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s = (const char *)&grbn->namelen +
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sizeof(grbn->namelen);
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l = EXTRACT_16BITS(&grbn->namelen);
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advance = lwres_printname(ndo, l, s);
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if (advance < 0)
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goto trunc;
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s += advance;
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break;
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default:
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unsupported++;
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break;
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}
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} else {
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/*
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* responses
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*/
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const lwres_gabnresponse_t *gabn;
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const lwres_gnbaresponse_t *gnba;
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const lwres_grbnresponse_t *grbn;
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uint32_t l, na;
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uint32_t i;
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gabn = NULL;
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gnba = NULL;
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grbn = NULL;
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switch (EXTRACT_32BITS(&np->opcode)) {
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case LWRES_OPCODE_NOOP:
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break;
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case LWRES_OPCODE_GETADDRSBYNAME:
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gabn = (const lwres_gabnresponse_t *)(np + 1);
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ND_TCHECK(gabn->realnamelen);
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/* XXX gabn points to packed struct */
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s = (const char *)&gabn->realnamelen +
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sizeof(gabn->realnamelen);
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l = EXTRACT_16BITS(&gabn->realnamelen);
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/* BIND910: not used */
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if (ndo->ndo_vflag > 2) {
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ND_PRINT((ndo, " flags:0x%x",
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EXTRACT_32BITS(&gabn->flags)));
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}
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ND_PRINT((ndo, " %u/%u", EXTRACT_16BITS(&gabn->naliases),
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EXTRACT_16BITS(&gabn->naddrs)));
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advance = lwres_printname(ndo, l, s);
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if (advance < 0)
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goto trunc;
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s += advance;
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/* aliases */
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na = EXTRACT_16BITS(&gabn->naliases);
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for (i = 0; i < na; i++) {
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advance = lwres_printnamelen(ndo, s);
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if (advance < 0)
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goto trunc;
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s += advance;
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}
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/* addrs */
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na = EXTRACT_16BITS(&gabn->naddrs);
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for (i = 0; i < na; i++) {
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advance = lwres_printaddr(ndo, (const lwres_addr_t *)s);
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if (advance < 0)
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goto trunc;
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s += advance;
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}
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break;
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case LWRES_OPCODE_GETNAMEBYADDR:
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gnba = (const lwres_gnbaresponse_t *)(np + 1);
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ND_TCHECK(gnba->realnamelen);
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/* XXX gnba points to packed struct */
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|
s = (const char *)&gnba->realnamelen +
|
|
sizeof(gnba->realnamelen);
|
|
l = EXTRACT_16BITS(&gnba->realnamelen);
|
|
|
|
/* BIND910: not used */
|
|
if (ndo->ndo_vflag > 2) {
|
|
ND_PRINT((ndo, " flags:0x%x",
|
|
EXTRACT_32BITS(&gnba->flags)));
|
|
}
|
|
|
|
ND_PRINT((ndo, " %u", EXTRACT_16BITS(&gnba->naliases)));
|
|
|
|
advance = lwres_printname(ndo, l, s);
|
|
if (advance < 0)
|
|
goto trunc;
|
|
s += advance;
|
|
|
|
/* aliases */
|
|
na = EXTRACT_16BITS(&gnba->naliases);
|
|
for (i = 0; i < na; i++) {
|
|
advance = lwres_printnamelen(ndo, s);
|
|
if (advance < 0)
|
|
goto trunc;
|
|
s += advance;
|
|
}
|
|
break;
|
|
case LWRES_OPCODE_GETRDATABYNAME:
|
|
/* XXX no trace, not tested */
|
|
grbn = (const lwres_grbnresponse_t *)(np + 1);
|
|
ND_TCHECK(grbn->nsigs);
|
|
|
|
/* BIND910: not used */
|
|
if (ndo->ndo_vflag > 2) {
|
|
ND_PRINT((ndo, " flags:0x%x",
|
|
EXTRACT_32BITS(&grbn->flags)));
|
|
}
|
|
|
|
ND_PRINT((ndo, " %s", tok2str(ns_type2str, "Type%d",
|
|
EXTRACT_16BITS(&grbn->rdtype))));
|
|
if (EXTRACT_16BITS(&grbn->rdclass) != C_IN) {
|
|
ND_PRINT((ndo, " %s", tok2str(ns_class2str, "Class%d",
|
|
EXTRACT_16BITS(&grbn->rdclass))));
|
|
}
|
|
ND_PRINT((ndo, " TTL "));
|
|
unsigned_relts_print(ndo, EXTRACT_32BITS(&grbn->ttl));
|
|
ND_PRINT((ndo, " %u/%u", EXTRACT_16BITS(&grbn->nrdatas),
|
|
EXTRACT_16BITS(&grbn->nsigs)));
|
|
|
|
/* XXX grbn points to packed struct */
|
|
s = (const char *)&grbn->nsigs+ sizeof(grbn->nsigs);
|
|
|
|
advance = lwres_printnamelen(ndo, s);
|
|
if (advance < 0)
|
|
goto trunc;
|
|
s += advance;
|
|
|
|
/* rdatas */
|
|
na = EXTRACT_16BITS(&grbn->nrdatas);
|
|
for (i = 0; i < na; i++) {
|
|
/* XXX should decode resource data */
|
|
advance = lwres_printbinlen(ndo, s);
|
|
if (advance < 0)
|
|
goto trunc;
|
|
s += advance;
|
|
}
|
|
|
|
/* sigs */
|
|
na = EXTRACT_16BITS(&grbn->nsigs);
|
|
for (i = 0; i < na; i++) {
|
|
/* XXX how should we print it? */
|
|
advance = lwres_printbinlen(ndo, s);
|
|
if (advance < 0)
|
|
goto trunc;
|
|
s += advance;
|
|
}
|
|
break;
|
|
default:
|
|
unsupported++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
tail:
|
|
/* length mismatch */
|
|
if (EXTRACT_32BITS(&np->length) != length) {
|
|
ND_PRINT((ndo, " [len: %u != %u]", EXTRACT_32BITS(&np->length),
|
|
length));
|
|
}
|
|
if (!unsupported && s < (const char *)np + EXTRACT_32BITS(&np->length))
|
|
ND_PRINT((ndo, "[extra]"));
|
|
return;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "[|lwres]"));
|
|
}
|