print-lwres.c - fp2-dev/platform/external/tcpdump - Gitiles

 /*
  * 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.
  */

 #ifndef lint
 static const char rcsid[] _U_ =
     "@(#) $Header: /tcpdump/master/tcpdump/print-lwres.c,v 1.13 2004/03/24 01:54:29 guy Exp $ (LBL)";
 #endif

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <tcpdump-stdinc.h>

 #include "nameser.h"

 #include <stdio.h>
 #include <string.h>

 #include "interface.h"
 #include "addrtoname.h"
 #include "extract.h"                    /* must come after interface.h */

 /* BIND9 lib/lwres/include/lwres */
 typedef u_int32_t lwres_uint32_t;
 typedef u_int16_t lwres_uint16_t;
 typedef u_int8_t lwres_uint8_t;

 struct lwres_lwpacket {
 	lwres_uint32_t		length;
 	lwres_uint16_t		version;
 	lwres_uint16_t		pktflags;
 	lwres_uint32_t		serial;
 	lwres_uint32_t		opcode;
 	lwres_uint32_t		result;
 	lwres_uint32_t		recvlength;
 	lwres_uint16_t		authtype;
 	lwres_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 */
 	lwres_uint16_t			datalength;
 	/* data follows */
 } lwres_nooprequest_t;

 typedef struct {
 	/* public */
 	lwres_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 {
 	lwres_uint32_t			family;
 	lwres_uint16_t			length;
 	/* address folows */
 };

 typedef struct {
 	/* public */
 	lwres_uint32_t			flags;
 	lwres_uint32_t			addrtypes;
 	lwres_uint16_t			namelen;
 	/* name follows */
 } lwres_gabnrequest_t;

 typedef struct {
 	/* public */
 	lwres_uint32_t			flags;
 	lwres_uint16_t			naliases;
 	lwres_uint16_t			naddrs;
 	lwres_uint16_t			realnamelen;
 	/* aliases follows */
 	/* addrs follows */
 	/* realname follows */
 } lwres_gabnresponse_t;

 /*
  * get name by address
  */
 #define LWRES_OPCODE_GETNAMEBYADDR	0x00010002U
 typedef struct {
 	/* public */
 	lwres_uint32_t			flags;
 	lwres_addr_t			addr;
 	/* addr body follows */
 } lwres_gnbarequest_t;

 typedef struct {
 	/* public */
 	lwres_uint32_t			flags;
 	lwres_uint16_t			naliases;
 	lwres_uint16_t			realnamelen;
 	/* aliases follows */
 	/* realname follows */
 } lwres_gnbaresponse_t;

 /*
  * get rdata by name
  */
 #define LWRES_OPCODE_GETRDATABYNAME	0x00010003U

 typedef struct {
 	/* public */
 	lwres_uint32_t			flags;
 	lwres_uint16_t			rdclass;
 	lwres_uint16_t			rdtype;
 	lwres_uint16_t			namelen;
 	/* name follows */
 } lwres_grbnrequest_t;

 typedef struct {
 	/* public */
 	lwres_uint32_t			flags;
 	lwres_uint16_t			rdclass;
 	lwres_uint16_t			rdtype;
 	lwres_uint32_t			ttl;
 	lwres_uint16_t			nrdatas;
 	lwres_uint16_t			nsigs;
 	/* realname here (len + name) */
 	/* rdata here (len + name) */
 	/* signatures here (len + name) */
 } lwres_grbnresponse_t;

 #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 */

 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 struct tok ns_type2str[];
 extern struct tok ns_class2str[];

 static int lwres_printname(size_t, const char *);
 static int lwres_printnamelen(const char *);
 static int lwres_printbinlen(const char *);
 static int lwres_printaddr(lwres_addr_t *);

 static int
 lwres_printname(size_t l, const char *p0)
 {
 	const char *p;
 	size_t i;

 	p = p0;
 	/* + 1 for terminating \0 */
 	if (p + l + 1 > (const char *)snapend)
 		goto trunc;

 	printf(" ");
 	for (i = 0; i < l; i++)
 		safeputchar(*p++);
 	p++;	/* skip terminating \0 */

 	return p - p0;

   trunc:
 	return -1;
 }

 static int
 lwres_printnamelen(const char *p)
 {
 	u_int16_t l;
 	int advance;

 	if (p + 2 > (const char *)snapend)
 		goto trunc;
 	l = EXTRACT_16BITS(p);
 	advance = lwres_printname(l, p + 2);
 	if (advance < 0)
 		goto trunc;
 	return 2 + advance;

   trunc:
 	return -1;
 }

 static int
 lwres_printbinlen(const char *p0)
 {
 	const char *p;
 	u_int16_t l;
 	int i;

 	p = p0;
 	if (p + 2 > (const char *)snapend)
 		goto trunc;
 	l = EXTRACT_16BITS(p);
 	if (p + 2 + l > (const char *)snapend)
 		goto trunc;
 	p += 2;
 	for (i = 0; i < l; i++)
 		printf("%02x", *p++);
 	return p - p0;

   trunc:
 	return -1;
 }

 static int
 lwres_printaddr(lwres_addr_t *ap)
 {
 	u_int16_t l;
 	const char *p;
 	int i;

 	TCHECK(ap->length);
 	l = EXTRACT_16BITS(&ap->length);
 	/* XXX ap points to packed struct */
 	p = (const char *)&ap->length + sizeof(ap->length);
 	TCHECK2(*p, l);

 	switch (EXTRACT_32BITS(&ap->family)) {
 	case 1:	/* IPv4 */
 		if (l < 4)
 			return -1;
 		printf(" %s", ipaddr_string(p));
 		p += sizeof(struct in_addr);
 		break;
 #ifdef INET6
 	case 2:	/* IPv6 */
 		if (l < 16)
 			return -1;
 		printf(" %s", ip6addr_string(p));
 		p += sizeof(struct in6_addr);
 		break;
 #endif
 	default:
 		printf(" %u/", EXTRACT_32BITS(&ap->family));
 		for (i = 0; i < l; i++)
 			printf("%02x", *p++);
 	}

 	return p - (const char *)ap;

   trunc:
 	return -1;
 }

 void
 lwres_print(register const u_char *bp, u_int length)
 {
 	const struct lwres_lwpacket *np;
 	u_int32_t v;
 	const char *s;
 	int response;
 	int advance;
 	int unsupported = 0;

 	np = (const struct lwres_lwpacket *)bp;
 	TCHECK(np->authlength);

 	printf(" lwres");
 	v = EXTRACT_16BITS(&np->version);
 	if (vflag || v != LWRES_LWPACKETVERSION_0)
 		printf(" v%u", v);
 	if (v != LWRES_LWPACKETVERSION_0) {
 		s = (const char *)np + EXTRACT_32BITS(&np->length);
 		goto tail;
 	}

 	response = EXTRACT_16BITS(&np->pktflags) & LWRES_LWPACKETFLAG_RESPONSE;

 	/* opcode and pktflags */
 	v = EXTRACT_32BITS(&np->opcode);
 	s = tok2str(opcode, "#0x%x", v);
 	printf(" %s%s", s, response ? "" : "?");

 	/* pktflags */
 	v = EXTRACT_16BITS(&np->pktflags);
 	if (v & ~LWRES_LWPACKETFLAG_RESPONSE)
 		printf("[0x%x]", v);

 	if (vflag > 1) {
 		printf(" (");	/*)*/
 		printf("serial:0x%x", EXTRACT_32BITS(&np->serial));
 		printf(" result:0x%x", EXTRACT_32BITS(&np->result));
 		printf(" recvlen:%u", EXTRACT_32BITS(&np->recvlength));
 		/* BIND910: not used */
 		if (vflag > 2) {
 			printf(" authtype:0x%x", EXTRACT_16BITS(&np->authtype));
 			printf(" authlen:%u", EXTRACT_16BITS(&np->authlength));
 		}
 		/*(*/
 		printf(")");
 	}

 	/* per-opcode content */
 	if (!response) {
 		/*
 		 * queries
 		 */
 		lwres_gabnrequest_t *gabn;
 		lwres_gnbarequest_t *gnba;
 		lwres_grbnrequest_t *grbn;
 		u_int32_t l;

 		gabn = NULL;
 		gnba = NULL;
 		grbn = NULL;

 		switch (EXTRACT_32BITS(&np->opcode)) {
 		case LWRES_OPCODE_NOOP:
 			break;
 		case LWRES_OPCODE_GETADDRSBYNAME:
 			gabn = (lwres_gabnrequest_t *)(np + 1);
 			TCHECK(gabn->namelen);
 			/* XXX gabn points to packed struct */
 			s = (const char *)&gabn->namelen +
 			    sizeof(gabn->namelen);
 			l = EXTRACT_16BITS(&gabn->namelen);

 			/* BIND910: not used */
 			if (vflag > 2) {
 				printf(" flags:0x%x",
 				    EXTRACT_32BITS(&gabn->flags));
 			}

 			v = EXTRACT_32BITS(&gabn->addrtypes);
 			switch (v & (LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6)) {
 			case LWRES_ADDRTYPE_V4:
 				printf(" IPv4");
 				break;
 			case LWRES_ADDRTYPE_V6:
 				printf(" IPv6");
 				break;
 			case LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6:
 				printf(" IPv4/6");
 				break;
 			}
 			if (v & ~(LWRES_ADDRTYPE_V4 | LWRES_ADDRTYPE_V6))
 				printf("[0x%x]", v);

 			advance = lwres_printname(l, s);
 			if (advance < 0)
 				goto trunc;
 			s += advance;
 			break;
 		case LWRES_OPCODE_GETNAMEBYADDR:
 			gnba = (lwres_gnbarequest_t *)(np + 1);
 			TCHECK(gnba->addr);

 			/* BIND910: not used */
 			if (vflag > 2) {
 				printf(" flags:0x%x",
 				    EXTRACT_32BITS(&gnba->flags));
 			}

 			s = (const char *)&gnba->addr;

 			advance = lwres_printaddr(&gnba->addr);
 			if (advance < 0)
 				goto trunc;
 			s += advance;
 			break;
 		case LWRES_OPCODE_GETRDATABYNAME:
 			/* XXX no trace, not tested */
 			grbn = (lwres_grbnrequest_t *)(np + 1);
 			TCHECK(grbn->namelen);

 			/* BIND910: not used */
 			if (vflag > 2) {
 				printf(" flags:0x%x",
 				    EXTRACT_32BITS(&grbn->flags));
 			}

 			printf(" %s", tok2str(ns_type2str, "Type%d",
 			    EXTRACT_16BITS(&grbn->rdtype)));
 			if (EXTRACT_16BITS(&grbn->rdclass) != C_IN) {
 				printf(" %s", tok2str(ns_class2str, "Class%d",
 				    EXTRACT_16BITS(&grbn->rdclass)));
 			}

 			/* XXX grbn points to packed struct */
 			s = (const char *)&grbn->namelen +
 			    sizeof(grbn->namelen);
 			l = EXTRACT_16BITS(&grbn->namelen);

 			advance = lwres_printname(l, s);
 			if (advance < 0)
 				goto trunc;
 			s += advance;
 			break;
 		default:
 			unsupported++;
 			break;
 		}
 	} else {
 		/*
 		 * responses
 		 */
 		lwres_gabnresponse_t *gabn;
 		lwres_gnbaresponse_t *gnba;
 		lwres_grbnresponse_t *grbn;
 		u_int32_t l, na;
 		u_int32_t i;

 		gabn = NULL;
 		gnba = NULL;
 		grbn = NULL;

 		switch (EXTRACT_32BITS(&np->opcode)) {
 		case LWRES_OPCODE_NOOP:
 			break;
 		case LWRES_OPCODE_GETADDRSBYNAME:
 			gabn = (lwres_gabnresponse_t *)(np + 1);
 			TCHECK(gabn->realnamelen);
 			/* XXX gabn points to packed struct */
 			s = (const char *)&gabn->realnamelen +
 			    sizeof(gabn->realnamelen);
 			l = EXTRACT_16BITS(&gabn->realnamelen);

 			/* BIND910: not used */
 			if (vflag > 2) {
 				printf(" flags:0x%x",
 				    EXTRACT_32BITS(&gabn->flags));
 			}

 			printf(" %u/%u", EXTRACT_16BITS(&gabn->naliases),
 			    EXTRACT_16BITS(&gabn->naddrs));

 			advance = lwres_printname(l, s);
 			if (advance < 0)
 				goto trunc;
 			s += advance;

 			/* aliases */
 			na = EXTRACT_16BITS(&gabn->naliases);
 			for (i = 0; i < na; i++) {
 				advance = lwres_printnamelen(s);
 				if (advance < 0)
 					goto trunc;
 				s += advance;
 			}

 			/* addrs */
 			na = EXTRACT_16BITS(&gabn->naddrs);
 			for (i = 0; i < na; i++) {
 				advance = lwres_printaddr((lwres_addr_t *)s);
 				if (advance < 0)
 					goto trunc;
 				s += advance;
 			}
 			break;
 		case LWRES_OPCODE_GETNAMEBYADDR:
 			gnba = (lwres_gnbaresponse_t *)(np + 1);
 			TCHECK(gnba->realnamelen);
 			/* XXX gnba points to packed struct */
 			s = (const char *)&gnba->realnamelen +
 			    sizeof(gnba->realnamelen);
 			l = EXTRACT_16BITS(&gnba->realnamelen);

 			/* BIND910: not used */
 			if (vflag > 2) {
 				printf(" flags:0x%x",
 				    EXTRACT_32BITS(&gnba->flags));
 			}

 			printf(" %u", EXTRACT_16BITS(&gnba->naliases));

 			advance = lwres_printname(l, s);
 			if (advance < 0)
 				goto trunc;
 			s += advance;

 			/* aliases */
 			na = EXTRACT_16BITS(&gnba->naliases);
 			for (i = 0; i < na; i++) {
 				advance = lwres_printnamelen(s);
 				if (advance < 0)
 					goto trunc;
 				s += advance;
 			}
 			break;
 		case LWRES_OPCODE_GETRDATABYNAME:
 			/* XXX no trace, not tested */
 			grbn = (lwres_grbnresponse_t *)(np + 1);
 			TCHECK(grbn->nsigs);

 			/* BIND910: not used */
 			if (vflag > 2) {
 				printf(" flags:0x%x",
 				    EXTRACT_32BITS(&grbn->flags));
 			}

 			printf(" %s", tok2str(ns_type2str, "Type%d",
 			    EXTRACT_16BITS(&grbn->rdtype)));
 			if (EXTRACT_16BITS(&grbn->rdclass) != C_IN) {
 				printf(" %s", tok2str(ns_class2str, "Class%d",
 				    EXTRACT_16BITS(&grbn->rdclass)));
 			}
 			printf(" TTL ");
 			relts_print(EXTRACT_32BITS(&grbn->ttl));
 			printf(" %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(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(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(s);
 				if (advance < 0)
 					goto trunc;
 				s += advance;
 			}
 			break;
 		default:
 			unsupported++;
 			break;
 		}
 	}

   tail:
 	/* length mismatch */
 	if (EXTRACT_32BITS(&np->length) != length) {
 		printf(" [len: %u != %u]", EXTRACT_32BITS(&np->length),
 		    length);
 	}
 	if (!unsupported && s < (const char *)np + EXTRACT_32BITS(&np->length))
 		printf("[extra]");
 	return;

   trunc:
 	printf("[|lwres]");
 	return;
 }
	/*
	* 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.
	*/

	#ifndef lint
	static const char rcsid[] _U_ =
	"@(#) $Header: /tcpdump/master/tcpdump/print-lwres.c,v 1.13 2004/03/24 01:54:29 guy Exp $ (LBL)";
	#endif

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <tcpdump-stdinc.h>

	#include "nameser.h"

	#include <stdio.h>
	#include <string.h>

	#include "interface.h"
	#include "addrtoname.h"
	#include "extract.h" /* must come after interface.h */

	/* BIND9 lib/lwres/include/lwres */
	typedef u_int32_t lwres_uint32_t;
	typedef u_int16_t lwres_uint16_t;
	typedef u_int8_t lwres_uint8_t;

	struct lwres_lwpacket {
	lwres_uint32_t length;
	lwres_uint16_t version;
	lwres_uint16_t pktflags;
	lwres_uint32_t serial;
	lwres_uint32_t opcode;
	lwres_uint32_t result;
	lwres_uint32_t recvlength;
	lwres_uint16_t authtype;
	lwres_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 */
	lwres_uint16_t datalength;
	/* data follows */
	} lwres_nooprequest_t;

	typedef struct {
	/* public */
	lwres_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 {
	lwres_uint32_t family;
	lwres_uint16_t length;
	/* address folows */
	};

	typedef struct {
	/* public */
	lwres_uint32_t flags;
	lwres_uint32_t addrtypes;
	lwres_uint16_t namelen;
	/* name follows */
	} lwres_gabnrequest_t;

	typedef struct {
	/* public */
	lwres_uint32_t flags;
	lwres_uint16_t naliases;
	lwres_uint16_t naddrs;
	lwres_uint16_t realnamelen;
	/* aliases follows */
	/* addrs follows */
	/* realname follows */
	} lwres_gabnresponse_t;

	/*
	* get name by address
	*/
	#define LWRES_OPCODE_GETNAMEBYADDR 0x00010002U
	typedef struct {
	/* public */
	lwres_uint32_t flags;
	lwres_addr_t addr;
	/* addr body follows */
	} lwres_gnbarequest_t;

	typedef struct {
	/* public */
	lwres_uint32_t flags;
	lwres_uint16_t naliases;
	lwres_uint16_t realnamelen;
	/* aliases follows */
	/* realname follows */
	} lwres_gnbaresponse_t;

	/*
	* get rdata by name
	*/
	#define LWRES_OPCODE_GETRDATABYNAME 0x00010003U

	typedef struct {
	/* public */
	lwres_uint32_t flags;
	lwres_uint16_t rdclass;
	lwres_uint16_t rdtype;
	lwres_uint16_t namelen;
	/* name follows */
	} lwres_grbnrequest_t;

	typedef struct {
	/* public */
	lwres_uint32_t flags;
	lwres_uint16_t rdclass;
	lwres_uint16_t rdtype;
	lwres_uint32_t ttl;
	lwres_uint16_t nrdatas;
	lwres_uint16_t nsigs;
	/* realname here (len + name) */
	/* rdata here (len + name) */
	/* signatures here (len + name) */
	} lwres_grbnresponse_t;

	#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 */

	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 struct tok ns_type2str[];
	extern struct tok ns_class2str[];

	static int lwres_printname(size_t, const char *);
	static int lwres_printnamelen(const char *);
	static int lwres_printbinlen(const char *);
	static int lwres_printaddr(lwres_addr_t *);

	static int
	lwres_printname(size_t l, const char *p0)
	{
	const char *p;
	size_t i;

	p = p0;
	/* + 1 for terminating \0 */
	if (p + l + 1 > (const char *)snapend)
	goto trunc;

	printf(" ");
	for (i = 0; i < l; i++)
	safeputchar(*p++);
	p++; /* skip terminating \0 */

	return p - p0;

	trunc:
	return -1;
	}

	static int
	lwres_printnamelen(const char *p)
	{
	u_int16_t l;
	int advance;

	if (p + 2 > (const char *)snapend)
	goto trunc;
	l = EXTRACT_16BITS(p);
	advance = lwres_printname(l, p + 2);
	if (advance < 0)
	goto trunc;
	return 2 + advance;

	trunc:
	return -1;
	}

	static int
	lwres_printbinlen(const char *p0)
	{
	const char *p;
	u_int16_t l;
	int i;

	p = p0;
	if (p + 2 > (const char *)snapend)
	goto trunc;
	l = EXTRACT_16BITS(p);
	if (p + 2 + l > (const char *)snapend)
	goto trunc;
	p += 2;
	for (i = 0; i < l; i++)
	printf("%02x", *p++);
	return p - p0;

	trunc:
	return -1;
	}

	static int
	lwres_printaddr(lwres_addr_t *ap)
	{
	u_int16_t l;
	const char *p;
	int i;

	TCHECK(ap->length);
	l = EXTRACT_16BITS(&ap->length);
	/* XXX ap points to packed struct */
	p = (const char *)&ap->length + sizeof(ap->length);
	TCHECK2(*p, l);

	switch (EXTRACT_32BITS(&ap->family)) {
	case 1: /* IPv4 */
	if (l < 4)
	return -1;
	printf(" %s", ipaddr_string(p));
	p += sizeof(struct in_addr);
	break;
	#ifdef INET6
	case 2: /* IPv6 */
	if (l < 16)
	return -1;
	printf(" %s", ip6addr_string(p));
	p += sizeof(struct in6_addr);
	break;
	#endif
	default:
	printf(" %u/", EXTRACT_32BITS(&ap->family));
	for (i = 0; i < l; i++)
	printf("%02x", *p++);
	}

	return p - (const char *)ap;

	trunc:
	return -1;
	}

	void
	lwres_print(register const u_char *bp, u_int length)
	{
	const struct lwres_lwpacket *np;
	u_int32_t v;
	const char *s;
	int response;
	int advance;
	int unsupported = 0;

	np = (const struct lwres_lwpacket *)bp;
	TCHECK(np->authlength);

	printf(" lwres");
	v = EXTRACT_16BITS(&np->version);
	if (vflag \|\| v != LWRES_LWPACKETVERSION_0)
	printf(" v%u", v);
	if (v != LWRES_LWPACKETVERSION_0) {
	s = (const char *)np + EXTRACT_32BITS(&np->length);
	goto tail;
	}

	response = EXTRACT_16BITS(&np->pktflags) & LWRES_LWPACKETFLAG_RESPONSE;

	/* opcode and pktflags */
	v = EXTRACT_32BITS(&np->opcode);
	s = tok2str(opcode, "#0x%x", v);
	printf(" %s%s", s, response ? "" : "?");

	/* pktflags */
	v = EXTRACT_16BITS(&np->pktflags);
	if (v & ~LWRES_LWPACKETFLAG_RESPONSE)
	printf("[0x%x]", v);

	if (vflag > 1) {
	printf(" ("); /)/
	printf("serial:0x%x", EXTRACT_32BITS(&np->serial));
	printf(" result:0x%x", EXTRACT_32BITS(&np->result));
	printf(" recvlen:%u", EXTRACT_32BITS(&np->recvlength));
	/* BIND910: not used */
	if (vflag > 2) {
	printf(" authtype:0x%x", EXTRACT_16BITS(&np->authtype));
	printf(" authlen:%u", EXTRACT_16BITS(&np->authlength));
	}
	/(/
	printf(")");
	}

	/* per-opcode content */
	if (!response) {
	/*
	* queries
	*/
	lwres_gabnrequest_t *gabn;
	lwres_gnbarequest_t *gnba;
	lwres_grbnrequest_t *grbn;
	u_int32_t l;

	gabn = NULL;
	gnba = NULL;
	grbn = NULL;

	switch (EXTRACT_32BITS(&np->opcode)) {
	case LWRES_OPCODE_NOOP:
	break;
	case LWRES_OPCODE_GETADDRSBYNAME:
	gabn = (lwres_gabnrequest_t *)(np + 1);
	TCHECK(gabn->namelen);
	/* XXX gabn points to packed struct */
	s = (const char *)&gabn->namelen +
	sizeof(gabn->namelen);
	l = EXTRACT_16BITS(&gabn->namelen);

	/* BIND910: not used */
	if (vflag > 2) {
	printf(" flags:0x%x",
	EXTRACT_32BITS(&gabn->flags));
	}

	v = EXTRACT_32BITS(&gabn->addrtypes);
	switch (v & (LWRES_ADDRTYPE_V4 \| LWRES_ADDRTYPE_V6)) {
	case LWRES_ADDRTYPE_V4:
	printf(" IPv4");
	break;
	case LWRES_ADDRTYPE_V6:
	printf(" IPv6");
	break;
	case LWRES_ADDRTYPE_V4 \| LWRES_ADDRTYPE_V6:
	printf(" IPv4/6");
	break;
	}
	if (v & ~(LWRES_ADDRTYPE_V4 \| LWRES_ADDRTYPE_V6))
	printf("[0x%x]", v);

	advance = lwres_printname(l, s);
	if (advance < 0)
	goto trunc;
	s += advance;
	break;
	case LWRES_OPCODE_GETNAMEBYADDR:
	gnba = (lwres_gnbarequest_t *)(np + 1);
	TCHECK(gnba->addr);

	/* BIND910: not used */
	if (vflag > 2) {
	printf(" flags:0x%x",
	EXTRACT_32BITS(&gnba->flags));
	}

	s = (const char *)&gnba->addr;

	advance = lwres_printaddr(&gnba->addr);
	if (advance < 0)
	goto trunc;
	s += advance;
	break;
	case LWRES_OPCODE_GETRDATABYNAME:
	/* XXX no trace, not tested */
	grbn = (lwres_grbnrequest_t *)(np + 1);
	TCHECK(grbn->namelen);

	/* BIND910: not used */
	if (vflag > 2) {
	printf(" flags:0x%x",
	EXTRACT_32BITS(&grbn->flags));
	}

	printf(" %s", tok2str(ns_type2str, "Type%d",
	EXTRACT_16BITS(&grbn->rdtype)));
	if (EXTRACT_16BITS(&grbn->rdclass) != C_IN) {
	printf(" %s", tok2str(ns_class2str, "Class%d",
	EXTRACT_16BITS(&grbn->rdclass)));
	}

	/* XXX grbn points to packed struct */
	s = (const char *)&grbn->namelen +
	sizeof(grbn->namelen);
	l = EXTRACT_16BITS(&grbn->namelen);

	advance = lwres_printname(l, s);
	if (advance < 0)
	goto trunc;
	s += advance;
	break;
	default:
	unsupported++;
	break;
	}
	} else {
	/*
	* responses
	*/
	lwres_gabnresponse_t *gabn;
	lwres_gnbaresponse_t *gnba;
	lwres_grbnresponse_t *grbn;
	u_int32_t l, na;
	u_int32_t i;

	gabn = NULL;
	gnba = NULL;
	grbn = NULL;

	switch (EXTRACT_32BITS(&np->opcode)) {
	case LWRES_OPCODE_NOOP:
	break;
	case LWRES_OPCODE_GETADDRSBYNAME:
	gabn = (lwres_gabnresponse_t *)(np + 1);
	TCHECK(gabn->realnamelen);
	/* XXX gabn points to packed struct */
	s = (const char *)&gabn->realnamelen +
	sizeof(gabn->realnamelen);
	l = EXTRACT_16BITS(&gabn->realnamelen);

	/* BIND910: not used */
	if (vflag > 2) {
	printf(" flags:0x%x",
	EXTRACT_32BITS(&gabn->flags));
	}

	printf(" %u/%u", EXTRACT_16BITS(&gabn->naliases),
	EXTRACT_16BITS(&gabn->naddrs));

	advance = lwres_printname(l, s);
	if (advance < 0)
	goto trunc;
	s += advance;

	/* aliases */
	na = EXTRACT_16BITS(&gabn->naliases);
	for (i = 0; i < na; i++) {
	advance = lwres_printnamelen(s);
	if (advance < 0)
	goto trunc;
	s += advance;
	}

	/* addrs */
	na = EXTRACT_16BITS(&gabn->naddrs);
	for (i = 0; i < na; i++) {
	advance = lwres_printaddr((lwres_addr_t *)s);
	if (advance < 0)
	goto trunc;
	s += advance;
	}
	break;
	case LWRES_OPCODE_GETNAMEBYADDR:
	gnba = (lwres_gnbaresponse_t *)(np + 1);
	TCHECK(gnba->realnamelen);
	/* XXX gnba points to packed struct */
	s = (const char *)&gnba->realnamelen +
	sizeof(gnba->realnamelen);
	l = EXTRACT_16BITS(&gnba->realnamelen);

	/* BIND910: not used */
	if (vflag > 2) {
	printf(" flags:0x%x",
	EXTRACT_32BITS(&gnba->flags));
	}

	printf(" %u", EXTRACT_16BITS(&gnba->naliases));

	advance = lwres_printname(l, s);
	if (advance < 0)
	goto trunc;
	s += advance;

	/* aliases */
	na = EXTRACT_16BITS(&gnba->naliases);
	for (i = 0; i < na; i++) {
	advance = lwres_printnamelen(s);
	if (advance < 0)
	goto trunc;
	s += advance;
	}
	break;
	case LWRES_OPCODE_GETRDATABYNAME:
	/* XXX no trace, not tested */
	grbn = (lwres_grbnresponse_t *)(np + 1);
	TCHECK(grbn->nsigs);

	/* BIND910: not used */
	if (vflag > 2) {
	printf(" flags:0x%x",
	EXTRACT_32BITS(&grbn->flags));
	}

	printf(" %s", tok2str(ns_type2str, "Type%d",
	EXTRACT_16BITS(&grbn->rdtype)));
	if (EXTRACT_16BITS(&grbn->rdclass) != C_IN) {
	printf(" %s", tok2str(ns_class2str, "Class%d",
	EXTRACT_16BITS(&grbn->rdclass)));
	}
	printf(" TTL ");
	relts_print(EXTRACT_32BITS(&grbn->ttl));
	printf(" %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(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(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(s);
	if (advance < 0)
	goto trunc;
	s += advance;
	}
	break;
	default:
	unsupported++;
	break;
	}
	}

	tail:
	/* length mismatch */
	if (EXTRACT_32BITS(&np->length) != length) {
	printf(" [len: %u != %u]", EXTRACT_32BITS(&np->length),
	length);
	}
	if (!unsupported && s < (const char *)np + EXTRACT_32BITS(&np->length))
	printf("[extra]");
	return;

	trunc:
	printf("[\|lwres]");
	return;
	}