The Tor Browser / file revision

 /*	$NetBSD: res_debug.c,v 1.7 2004/11/07 02:25:01 christos Exp $	*/

 /*

  * Copyright (c) 1985

  *    The Regents of the University of California.  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. All advertising materials mentioning features or use of this software

  *    must display the following acknowledgement:

  * 	This product includes software developed by the University of

  * 	California, Berkeley and its contributors.

  * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.

  */

 /*

  * Portions Copyright (c) 1993 by Digital Equipment Corporation.

  *

  * Permission to use, copy, modify, and distribute this software for any

  * purpose with or without fee is hereby granted, provided that the above

  * copyright notice and this permission notice appear in all copies, and that

  * the name of Digital Equipment Corporation not be used in advertising or

  * publicity pertaining to distribution of the document or software without

  * specific, written prior permission.

  *

  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL

  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES

  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT

  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL

  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

  * SOFTWARE.

  */

 /*

  * Portions Copyright (c) 1995 by International Business Machines, Inc.

  *

  * International Business Machines, Inc. (hereinafter called IBM) grants

  * permission under its copyrights to use, copy, modify, and distribute this

  * Software with or without fee, provided that the above copyright notice and

  * all paragraphs of this notice appear in all copies, and that the name of IBM

  * not be used in connection with the marketing of any product incorporating

  * the Software or modifications thereof, without specific, written prior

  * permission.

  *

  * To the extent it has a right to do so, IBM grants an immunity from suit

  * under its patents, if any, for the use, sale or manufacture of products to

  * the extent that such products are used for performing Domain Name System

  * dynamic updates in TCP/IP networks by means of the Software.  No immunity is

  * granted for any product per se or for any other function of any product.

  *

  * THE SOFTWARE IS PROVIDED "AS IS", AND IBM DISCLAIMS ALL WARRANTIES,

  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

  * PARTICULAR PURPOSE.  IN NO EVENT SHALL IBM BE LIABLE FOR ANY SPECIAL,

  * DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER ARISING

  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE, EVEN

  * IF IBM IS APPRISED OF THE POSSIBILITY OF SUCH DAMAGES.

  */

 /*

  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")

  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.

  *

  * Permission to use, copy, modify, and distribute this software for any

  * purpose with or without fee is hereby granted, provided that the above

  * copyright notice and this permission notice appear in all copies.

  *

  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES

  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR

  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT

  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

  */

 /*

  * This version of this file is derived from Android 2.3 "Gingerbread",

  * which contains uncredited changes by Android/Google developers.  It has

  * been modified in 2011 for use in the Android build of Mozilla Firefox by

  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,

  * and Steve Workman <sjhworkman@gmail.com>).

  * These changes are offered under the same license as the original NetBSD

  * file, whose copyright and license are unchanged above.

  */

 #define ANDROID_CHANGES 1

 #define MOZILLA_NECKO_EXCLUDE_CODE 1

 #include <sys/cdefs.h>

 #if defined(LIBC_SCCS) && !defined(lint)

 #ifdef notdef

 static const char sccsid[] = "@(#)res_debug.c	8.1 (Berkeley) 6/4/93";

 static const char rcsid[] = "Id: res_debug.c,v 1.3.2.5.4.5 2004/07/28 20:16:46 marka Exp";

 #else

 __RCSID("$NetBSD: res_debug.c,v 1.7 2004/11/07 02:25:01 christos Exp $");

 #endif

 #endif /* LIBC_SCCS and not lint */

 #include <sys/types.h>

 #include <sys/param.h>

 #include <sys/socket.h>

 #include <netinet/in.h>

 #include <arpa/inet.h>

 #include "arpa_nameser.h"

 #include <ctype.h>

 #include <errno.h>

 #include <math.h>

 #include <netdb.h>

 #include "resolv_private.h"

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

 #include <time.h>

 #ifdef SPRINTF_CHAR

 # define SPRINTF(x) strlen(sprintf/**/x)

 #else

 # define SPRINTF(x) sprintf x

 #endif

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 static const char *precsize_ntoa(u_int32_t);

 #endif

 extern const char * const _res_opcodes[];

 extern const char * const _res_sectioncodes[];

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 #ifndef _LIBC

 /*

  * Print the current options.

  */

 void

 fp_resstat(const res_state statp, FILE *file) {

 	u_long mask;

 	fprintf(file, ";; res options:");

 	for (mask = 1;  mask != 0U;  mask <<= 1)

 		if (statp->options & mask)

 			fprintf(file, " %s", p_option(mask));

 	putc('\n', file);

 }

 #endif

 #endif

 static void

 do_section(const res_state statp,

 	   ns_msg *handle, ns_sect section,

 	   int pflag, FILE *file)

 {

 	int n, sflag, rrnum;

 	int buflen = 2048;

 	char *buf;

 	ns_opcode opcode;

 	ns_rr rr;

 	/*

 	 * Print answer records.

 	 */

 	sflag = (statp->pfcode & pflag);

 	if (statp->pfcode && !sflag)

 		return;

 	buf = malloc((size_t)buflen);

 	if (buf == NULL) {

 		fprintf(file, ";; memory allocation failure\n");

 		return;

 	}

 	opcode = (ns_opcode) ns_msg_getflag(*handle, ns_f_opcode);

 	rrnum = 0;

 	for (;;) {

 		if (ns_parserr(handle, section, rrnum, &rr)) {

 			if (errno != ENODEV)

 				fprintf(file, ";; ns_parserr: %s\n",

 					strerror(errno));

 			else if (rrnum > 0 && sflag != 0 &&

 				 (statp->pfcode & RES_PRF_HEAD1))

 				putc('\n', file);

 			goto cleanup;

 		}

 		if (rrnum == 0 && sflag != 0 && (statp->pfcode & RES_PRF_HEAD1))

 			fprintf(file, ";; %s SECTION:\n",

 				p_section(section, opcode));

 		if (section == ns_s_qd)

 			fprintf(file, ";;\t%s, type = %s, class = %s\n",

 				ns_rr_name(rr),

 				p_type(ns_rr_type(rr)),

 				p_class(ns_rr_class(rr)));

 		else if (section == ns_s_ar && ns_rr_type(rr) == ns_t_opt) {

 			u_int32_t ttl = ns_rr_ttl(rr);

 			fprintf(file,

 				"; EDNS: version: %u, udp=%u, flags=%04x\n",

 				(ttl>>16)&0xff, ns_rr_class(rr), ttl&0xffff);

 		} else {

 			n = ns_sprintrr(handle, &rr, NULL, NULL,

 					buf, (u_int)buflen);

 			if (n < 0) {

 				if (errno == ENOSPC) {

 					free(buf);

 					buf = NULL;

 					if (buflen < 131072)

 						buf = malloc((size_t)(buflen += 1024));

 					if (buf == NULL) {

 						fprintf(file,

 				              ";; memory allocation failure\n");

 					      return;

 					}

 					continue;

 				}

 				fprintf(file, ";; ns_sprintrr: %s\n",

 					strerror(errno));

 				goto cleanup;

 			}

 			fputs(buf, file);

 			fputc('\n', file);

 		}

 		rrnum++;

 	}

  cleanup:

 	if (buf != NULL)

 		free(buf);

 }

 /*

  * Print the contents of a query.

  * This is intended to be primarily a debugging routine.

  */

 void

 res_pquery(const res_state statp, const u_char *msg, int len, FILE *file) {

 	ns_msg handle;

 	int qdcount, ancount, nscount, arcount;

 	u_int opcode, rcode, id;

 	if (ns_initparse(msg, len, &handle) < 0) {

 		fprintf(file, ";; ns_initparse: %s\n", strerror(errno));

 		return;

 	}

 	opcode = ns_msg_getflag(handle, ns_f_opcode);

 	rcode = ns_msg_getflag(handle, ns_f_rcode);

 	id = ns_msg_id(handle);

 	qdcount = ns_msg_count(handle, ns_s_qd);

 	ancount = ns_msg_count(handle, ns_s_an);

 	nscount = ns_msg_count(handle, ns_s_ns);

 	arcount = ns_msg_count(handle, ns_s_ar);

 	/*

 	 * Print header fields.

 	 */

 	if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEADX) || rcode)

 		fprintf(file,

 			";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n",

 			_res_opcodes[opcode], p_rcode((int)rcode), id);

 	if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEADX))

 		putc(';', file);

 	if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEAD2)) {

 		fprintf(file, "; flags:");

 		if (ns_msg_getflag(handle, ns_f_qr))

 			fprintf(file, " qr");

 		if (ns_msg_getflag(handle, ns_f_aa))

 			fprintf(file, " aa");

 		if (ns_msg_getflag(handle, ns_f_tc))

 			fprintf(file, " tc");

 		if (ns_msg_getflag(handle, ns_f_rd))

 			fprintf(file, " rd");

 		if (ns_msg_getflag(handle, ns_f_ra))

 			fprintf(file, " ra");

 		if (ns_msg_getflag(handle, ns_f_z))

 			fprintf(file, " ??");

 		if (ns_msg_getflag(handle, ns_f_ad))

 			fprintf(file, " ad");

 		if (ns_msg_getflag(handle, ns_f_cd))

 			fprintf(file, " cd");

 	}

 	if ((!statp->pfcode) || (statp->pfcode & RES_PRF_HEAD1)) {

 		fprintf(file, "; %s: %d",

 			p_section(ns_s_qd, (int)opcode), qdcount);

 		fprintf(file, ", %s: %d",

 			p_section(ns_s_an, (int)opcode), ancount);

 		fprintf(file, ", %s: %d",

 			p_section(ns_s_ns, (int)opcode), nscount);

 		fprintf(file, ", %s: %d",

 			p_section(ns_s_ar, (int)opcode), arcount);

 	}

 	if ((!statp->pfcode) || (statp->pfcode &

 		(RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {

 		putc('\n',file);

 	}

 	/*

 	 * Print the various sections.

 	 */

 	do_section(statp, &handle, ns_s_qd, RES_PRF_QUES, file);

 	do_section(statp, &handle, ns_s_an, RES_PRF_ANS, file);

 	do_section(statp, &handle, ns_s_ns, RES_PRF_AUTH, file);

 	do_section(statp, &handle, ns_s_ar, RES_PRF_ADD, file);

 	if (qdcount == 0 && ancount == 0 &&

 	    nscount == 0 && arcount == 0)

 		putc('\n', file);

 }

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 const u_char *

 p_cdnname(const u_char *cp, const u_char *msg, int len, FILE *file) {

 	char name[MAXDNAME];

 	int n;

 	if ((n = dn_expand(msg, msg + len, cp, name, sizeof name)) < 0)

 		return (NULL);

 	if (name[0] == '\0')

 		putc('.', file);

 	else

 		fputs(name, file);

 	return (cp + n);

 }

 const u_char *

 p_cdname(const u_char *cp, const u_char *msg, FILE *file) {

 	return (p_cdnname(cp, msg, PACKETSZ, file));

 }

 /* Return a fully-qualified domain name from a compressed name (with

    length supplied).  */

 const u_char *

 p_fqnname(cp, msg, msglen, name, namelen)

 	const u_char *cp, *msg;

 	int msglen;

 	char *name;

 	int namelen;

 {

 	int n, newlen;

 	if ((n = dn_expand(msg, cp + msglen, cp, name, namelen)) < 0)

 		return (NULL);

 	newlen = strlen(name);

 	if (newlen == 0 || name[newlen - 1] != '.') {

 		if (newlen + 1 >= namelen)	/* Lack space for final dot */

 			return (NULL);

 		else

 			strcpy(name + newlen, ".");

 	}

 	return (cp + n);

 }

 /* XXX:	the rest of these functions need to become length-limited, too. */

 const u_char *

 p_fqname(const u_char *cp, const u_char *msg, FILE *file) {

 	char name[MAXDNAME];

 	const u_char *n;

 	n = p_fqnname(cp, msg, MAXCDNAME, name, sizeof name);

 	if (n == NULL)

 		return (NULL);

 	fputs(name, file);

 	return (n);

 }

 #endif

 /*

  * Names of RR classes and qclasses.  Classes and qclasses are the same, except

  * that C_ANY is a qclass but not a class.  (You can ask for records of class

  * C_ANY, but you can't have any records of that class in the database.)

  */

 const struct res_sym __p_class_syms[] = {

 	{C_IN,		"IN",		(char *)0},

 	{C_CHAOS,	"CH",		(char *)0},

 	{C_CHAOS,	"CHAOS",	(char *)0},

 	{C_HS,		"HS",		(char *)0},

 	{C_HS,		"HESIOD",	(char *)0},

 	{C_ANY,		"ANY",		(char *)0},

 	{C_NONE,	"NONE",		(char *)0},

 	{C_IN, 		(char *)0,	(char *)0}

 };

 /*

  * Names of message sections.

  */

 const struct res_sym __p_default_section_syms[] = {

 	{ns_s_qd,	"QUERY",	(char *)0},

 	{ns_s_an,	"ANSWER",	(char *)0},

 	{ns_s_ns,	"AUTHORITY",	(char *)0},

 	{ns_s_ar,	"ADDITIONAL",	(char *)0},

 	{0,             (char *)0,	(char *)0}

 };

 const struct res_sym __p_update_section_syms[] = {

 	{S_ZONE,	"ZONE",		(char *)0},

 	{S_PREREQ,	"PREREQUISITE",	(char *)0},

 	{S_UPDATE,	"UPDATE",	(char *)0},

 	{S_ADDT,	"ADDITIONAL",	(char *)0},

 	{0,             (char *)0,	(char *)0}

 };

 const struct res_sym __p_key_syms[] = {

 	{NS_ALG_MD5RSA,		"RSA",		"RSA KEY with MD5 hash"},

 	{NS_ALG_DH,		"DH",		"Diffie Hellman"},

 	{NS_ALG_DSA,		"DSA",		"Digital Signature Algorithm"},

 	{NS_ALG_EXPIRE_ONLY,	"EXPIREONLY",	"No algorithm"},

 	{NS_ALG_PRIVATE_OID,	"PRIVATE",	"Algorithm obtained from OID"},

 	{0,			NULL,		NULL}

 };

 const struct res_sym __p_cert_syms[] = {

 	{cert_t_pkix,	"PKIX",		"PKIX (X.509v3) Certificate"},

 	{cert_t_spki,	"SPKI",		"SPKI certificate"},

 	{cert_t_pgp,	"PGP",		"PGP certificate"},

 	{cert_t_url,	"URL",		"URL Private"},

 	{cert_t_oid,	"OID",		"OID Private"},

 	{0,		NULL,		NULL}

 };

 /*

  * Names of RR types and qtypes.  Types and qtypes are the same, except

  * that T_ANY is a qtype but not a type.  (You can ask for records of type

  * T_ANY, but you can't have any records of that type in the database.)

  */

 const struct res_sym __p_type_syms[] = {

 	{ns_t_a,	"A",		"address"},

 	{ns_t_ns,	"NS",		"name server"},

 	{ns_t_md,	"MD",		"mail destination (deprecated)"},

 	{ns_t_mf,	"MF",		"mail forwarder (deprecated)"},

 	{ns_t_cname,	"CNAME",	"canonical name"},

 	{ns_t_soa,	"SOA",		"start of authority"},

 	{ns_t_mb,	"MB",		"mailbox"},

 	{ns_t_mg,	"MG",		"mail group member"},

 	{ns_t_mr,	"MR",		"mail rename"},

 	{ns_t_null,	"NULL",		"null"},

 	{ns_t_wks,	"WKS",		"well-known service (deprecated)"},

 	{ns_t_ptr,	"PTR",		"domain name pointer"},

 	{ns_t_hinfo,	"HINFO",	"host information"},

 	{ns_t_minfo,	"MINFO",	"mailbox information"},

 	{ns_t_mx,	"MX",		"mail exchanger"},

 	{ns_t_txt,	"TXT",		"text"},

 	{ns_t_rp,	"RP",		"responsible person"},

 	{ns_t_afsdb,	"AFSDB",	"DCE or AFS server"},

 	{ns_t_x25,	"X25",		"X25 address"},

 	{ns_t_isdn,	"ISDN",		"ISDN address"},

 	{ns_t_rt,	"RT",		"router"},

 	{ns_t_nsap,	"NSAP",		"nsap address"},

 	{ns_t_nsap_ptr,	"NSAP_PTR",	"domain name pointer"},

 	{ns_t_sig,	"SIG",		"signature"},

 	{ns_t_key,	"KEY",		"key"},

 	{ns_t_px,	"PX",		"mapping information"},

 	{ns_t_gpos,	"GPOS",		"geographical position (withdrawn)"},

 	{ns_t_aaaa,	"AAAA",		"IPv6 address"},

 	{ns_t_loc,	"LOC",		"location"},

 	{ns_t_nxt,	"NXT",		"next valid name (unimplemented)"},

 	{ns_t_eid,	"EID",		"endpoint identifier (unimplemented)"},

 	{ns_t_nimloc,	"NIMLOC",	"NIMROD locator (unimplemented)"},

 	{ns_t_srv,	"SRV",		"server selection"},

 	{ns_t_atma,	"ATMA",		"ATM address (unimplemented)"},

 	{ns_t_tkey,	"TKEY",		"tkey"},

 	{ns_t_tsig,	"TSIG",		"transaction signature"},

 	{ns_t_ixfr,	"IXFR",		"incremental zone transfer"},

 	{ns_t_axfr,	"AXFR",		"zone transfer"},

 	{ns_t_zxfr,	"ZXFR",		"compressed zone transfer"},

 	{ns_t_mailb,	"MAILB",	"mailbox-related data (deprecated)"},

 	{ns_t_maila,	"MAILA",	"mail agent (deprecated)"},

 	{ns_t_naptr,	"NAPTR",	"URN Naming Authority"},

 	{ns_t_kx,	"KX",		"Key Exchange"},

 	{ns_t_cert,	"CERT",		"Certificate"},

 	{ns_t_a6,	"A6",		"IPv6 Address"},

 	{ns_t_dname,	"DNAME",	"dname"},

 	{ns_t_sink,	"SINK",		"Kitchen Sink (experimental)"},

 	{ns_t_opt,	"OPT",		"EDNS Options"},

 	{ns_t_any,	"ANY",		"\"any\""},

 	{0, 		NULL,		NULL}

 };

 /*

  * Names of DNS rcodes.

  */

 const struct res_sym __p_rcode_syms[] = {

 	{ns_r_noerror,	"NOERROR",		"no error"},

 	{ns_r_formerr,	"FORMERR",		"format error"},

 	{ns_r_servfail,	"SERVFAIL",		"server failed"},

 	{ns_r_nxdomain,	"NXDOMAIN",		"no such domain name"},

 	{ns_r_notimpl,	"NOTIMP",		"not implemented"},

 	{ns_r_refused,	"REFUSED",		"refused"},

 	{ns_r_yxdomain,	"YXDOMAIN",		"domain name exists"},

 	{ns_r_yxrrset,	"YXRRSET",		"rrset exists"},

 	{ns_r_nxrrset,	"NXRRSET",		"rrset doesn't exist"},

 	{ns_r_notauth,	"NOTAUTH",		"not authoritative"},

 	{ns_r_notzone,	"NOTZONE",		"Not in zone"},

 	{ns_r_max,	"",			""},

 	{ns_r_badsig,	"BADSIG",		"bad signature"},

 	{ns_r_badkey,	"BADKEY",		"bad key"},

 	{ns_r_badtime,	"BADTIME",		"bad time"},

 	{0, 		NULL,			NULL}

 };

 int

 sym_ston(const struct res_sym *syms, const char *name, int *success) {

 	for (; syms->name != 0; syms++) {

 		if (strcasecmp (name, syms->name) == 0) {

 			if (success)

 				*success = 1;

 			return (syms->number);

 		}

 	}

 	if (success)

 		*success = 0;

 	return (syms->number);		/* The default value. */

 }

 const char *

 sym_ntos(const struct res_sym *syms, int number, int *success) {

 	static char unname[20];

 	for (; syms->name != 0; syms++) {

 		if (number == syms->number) {

 			if (success)

 				*success = 1;

 			return (syms->name);

 		}

 	}

 	sprintf(unname, "%d", number);		/* XXX nonreentrant */

 	if (success)

 		*success = 0;

 	return (unname);

 }

 const char *

 sym_ntop(const struct res_sym *syms, int number, int *success) {

 	static char unname[20];

 	for (; syms->name != 0; syms++) {

 		if (number == syms->number) {

 			if (success)

 				*success = 1;

 			return (syms->humanname);

 		}

 	}

 	sprintf(unname, "%d", number);		/* XXX nonreentrant */

 	if (success)

 		*success = 0;

 	return (unname);

 }

 /*

  * Return a string for the type.

  */

 const char *

 p_type(int type) {

 	int success;

 	const char *result;

 	static char typebuf[20];

 	result = sym_ntos(__p_type_syms, type, &success);

 	if (success)

 		return (result);

 	if (type < 0 || type > 0xffff)

 		return ("BADTYPE");

 	sprintf(typebuf, "TYPE%d", type);

 	return (typebuf);

 }

 /*

  * Return a string for the type.

  */

 const char *

 p_section(int section, int opcode) {

 	const struct res_sym *symbols;

 	switch (opcode) {

 	case ns_o_update:

 		symbols = __p_update_section_syms;

 		break;

 	default:

 		symbols = __p_default_section_syms;

 		break;

 	}

 	return (sym_ntos(symbols, section, (int *)0));

 }

 /*

  * Return a mnemonic for class.

  */

 const char *

 p_class(int class) {

 	int success;

 	const char *result;

 	static char classbuf[20];

 	result = sym_ntos(__p_class_syms, class, &success);

 	if (success)

 		return (result);

 	if (class < 0 || class > 0xffff)

 		return ("BADCLASS");

 	sprintf(classbuf, "CLASS%d", class);

 	return (classbuf);

 }

 /*

  * Return a mnemonic for an option

  */

 const char *

 p_option(u_long option) {

 	static char nbuf[40];

 	switch (option) {

 	case RES_INIT:		return "init";

 	case RES_DEBUG:		return "debug";

 	case RES_AAONLY:	return "aaonly(unimpl)";

 	case RES_USEVC:		return "usevc";

 	case RES_PRIMARY:	return "primry(unimpl)";

 	case RES_IGNTC:		return "igntc";

 	case RES_RECURSE:	return "recurs";

 	case RES_DEFNAMES:	return "defnam";

 	case RES_STAYOPEN:	return "styopn";

 	case RES_DNSRCH:	return "dnsrch";

 	case RES_INSECURE1:	return "insecure1";

 	case RES_INSECURE2:	return "insecure2";

 	case RES_NOALIASES:	return "noaliases";

 	case RES_USE_INET6:	return "inet6";

 #ifdef RES_USE_EDNS0	/* KAME extension */

 	case RES_USE_EDNS0:	return "edns0";

 #endif

 #ifdef RES_USE_DNAME

 	case RES_USE_DNAME:	return "dname";

 #endif

 #ifdef RES_USE_DNSSEC

 	case RES_USE_DNSSEC:	return "dnssec";

 #endif

 #ifdef RES_NOTLDQUERY

 	case RES_NOTLDQUERY:	return "no-tld-query";

 #endif

 #ifdef RES_NO_NIBBLE2

 	case RES_NO_NIBBLE2:	return "no-nibble2";

 #endif

 				/* XXX nonreentrant */

 	default:		sprintf(nbuf, "?0x%lx?", (u_long)option);

 				return (nbuf);

 	}

 }

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 /*

  * Return a mnemonic for a time to live.

  */

 const char *

 p_time(u_int32_t value) {

 	static char nbuf[40];		/* XXX nonreentrant */

 	if (ns_format_ttl((u_long)value, nbuf, sizeof nbuf) < 0)

 		sprintf(nbuf, "%u", value);

 	return (nbuf);

 }

 #endif

 /*

  * Return a string for the rcode.

  */

 const char *

 p_rcode(int rcode) {

 	return (sym_ntos(__p_rcode_syms, rcode, (int *)0));

 }

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 /*

  * Return a string for a res_sockaddr_union.

  */

 const char *

 p_sockun(union res_sockaddr_union u, char *buf, size_t size) {

 	char ret[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:123.123.123.123"];

 	switch (u.sin.sin_family) {

 	case AF_INET:

 		inet_ntop(AF_INET, &u.sin.sin_addr, ret, sizeof ret);

 		break;

 #ifdef HAS_INET6_STRUCTS

 	case AF_INET6:

 		inet_ntop(AF_INET6, &u.sin6.sin6_addr, ret, sizeof ret);

 		break;

 #endif

 	default:

 		sprintf(ret, "[af%d]", u.sin.sin_family);

 		break;

 	}

 	if (size > 0U) {

 		strncpy(buf, ret, size - 1);

 		buf[size - 1] = '0';

 	}

 	return (buf);

 }

 #endif

 /*

  * routines to convert between on-the-wire RR format and zone file format.

  * Does not contain conversion to/from decimal degrees; divide or multiply

  * by 60*60*1000 for that.

  */

 static const unsigned int poweroften[10] = {1, 10, 100, 1000, 10000, 100000,

 				      1000000,10000000,100000000,1000000000};

 /* takes an XeY precision/size value, returns a string representation. */

 static const char *

 precsize_ntoa(prec)

 	u_int32_t prec;

 {

 	static char retbuf[sizeof "90000000.00"];	/* XXX nonreentrant */

 	unsigned long val;

 	int mantissa, exponent;

 	mantissa = (int)((prec >> 4) & 0x0f) % 10;

 	exponent = (int)((prec >> 0) & 0x0f) % 10;

 	val = mantissa * poweroften[exponent];

 	(void) sprintf(retbuf, "%lu.%.2lu", val/100, val%100);

 	return (retbuf);

 }

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 /* converts ascii size/precision X * 10**Y(cm) to 0xXY.  moves pointer. */

 static u_int8_t

 precsize_aton(const char **strptr) {

 	unsigned int mval = 0, cmval = 0;

 	u_int8_t retval = 0;

 	const char *cp;

 	int exponent;

 	int mantissa;

 	cp = *strptr;

 	while (isdigit((unsigned char)*cp))

 		mval = mval * 10 + (*cp++ - '0');

 	if (*cp == '.') {		/* centimeters */

 		cp++;

 		if (isdigit((unsigned char)*cp)) {

 			cmval = (*cp++ - '0') * 10;

 			if (isdigit((unsigned char)*cp)) {

 				cmval += (*cp++ - '0');

 			}

 		}

 	}

 	cmval = (mval * 100) + cmval;

 	for (exponent = 0; exponent < 9; exponent++)

 		if (cmval < poweroften[exponent+1])

 			break;

 	mantissa = cmval / poweroften[exponent];

 	if (mantissa > 9)

 		mantissa = 9;

 	retval = (mantissa << 4) | exponent;

 	*strptr = cp;

 	return (retval);

 }

 /* converts ascii lat/lon to unsigned encoded 32-bit number.  moves pointer. */

 static u_int32_t

 latlon2ul(const char **latlonstrptr, int *which) {

 	const char *cp;

 	u_int32_t retval;

 	int deg = 0, min = 0, secs = 0, secsfrac = 0;

 	cp = *latlonstrptr;

 	while (isdigit((unsigned char)*cp))

 		deg = deg * 10 + (*cp++ - '0');

 	while (isspace((unsigned char)*cp))

 		cp++;

 	if (!(isdigit((unsigned char)*cp)))

 		goto fndhemi;

 	while (isdigit((unsigned char)*cp))

 		min = min * 10 + (*cp++ - '0');

 	while (isspace((unsigned char)*cp))

 		cp++;

 	if (!(isdigit((unsigned char)*cp)))

 		goto fndhemi;

 	while (isdigit((unsigned char)*cp))

 		secs = secs * 10 + (*cp++ - '0');

 	if (*cp == '.') {		/* decimal seconds */

 		cp++;

 		if (isdigit((unsigned char)*cp)) {

 			secsfrac = (*cp++ - '0') * 100;

 			if (isdigit((unsigned char)*cp)) {

 				secsfrac += (*cp++ - '0') * 10;

 				if (isdigit((unsigned char)*cp)) {

 					secsfrac += (*cp++ - '0');

 				}

 			}

 		}

 	}

 	while (!isspace((unsigned char)*cp))	/* if any trailing garbage */

 		cp++;

 	while (isspace((unsigned char)*cp))

 		cp++;

  fndhemi:

 	switch (*cp) {

 	case 'N': case 'n':

 	case 'E': case 'e':

 		retval = ((unsigned)1<<31)

 			+ (((((deg * 60) + min) * 60) + secs) * 1000)

 			+ secsfrac;

 		break;

 	case 'S': case 's':

 	case 'W': case 'w':

 		retval = ((unsigned)1<<31)

 			- (((((deg * 60) + min) * 60) + secs) * 1000)

 			- secsfrac;

 		break;

 	default:

 		retval = 0;	/* invalid value -- indicates error */

 		break;

 	}

 	switch (*cp) {

 	case 'N': case 'n':

 	case 'S': case 's':

 		*which = 1;	/* latitude */

 		break;

 	case 'E': case 'e':

 	case 'W': case 'w':

 		*which = 2;	/* longitude */

 		break;

 	default:

 		*which = 0;	/* error */

 		break;

 	}

 	cp++;			/* skip the hemisphere */

 	while (!isspace((unsigned char)*cp))	/* if any trailing garbage */

 		cp++;

 	while (isspace((unsigned char)*cp))	/* move to next field */

 		cp++;

 	*latlonstrptr = cp;

 	return (retval);

 }

 /* converts a zone file representation in a string to an RDATA on-the-wire

  * representation. */

 int

 loc_aton(ascii, binary)

 	const char *ascii;

 	u_char *binary;

 {

 	const char *cp, *maxcp;

 	u_char *bcp;

 	u_int32_t latit = 0, longit = 0, alt = 0;

 	u_int32_t lltemp1 = 0, lltemp2 = 0;

 	int altmeters = 0, altfrac = 0, altsign = 1;

 	u_int8_t hp = 0x16;	/* default = 1e6 cm = 10000.00m = 10km */

 	u_int8_t vp = 0x13;	/* default = 1e3 cm = 10.00m */

 	u_int8_t siz = 0x12;	/* default = 1e2 cm = 1.00m */

 	int which1 = 0, which2 = 0;

 	cp = ascii;

 	maxcp = cp + strlen(ascii);

 	lltemp1 = latlon2ul(&cp, &which1);

 	lltemp2 = latlon2ul(&cp, &which2);

 	switch (which1 + which2) {

 	case 3:			/* 1 + 2, the only valid combination */

 		if ((which1 == 1) && (which2 == 2)) { /* normal case */

 			latit = lltemp1;

 			longit = lltemp2;

 		} else if ((which1 == 2) && (which2 == 1)) { /* reversed */

 			longit = lltemp1;

 			latit = lltemp2;

 		} else {	/* some kind of brokenness */

 			return (0);

 		}

 		break;

 	default:		/* we didn't get one of each */

 		return (0);

 	}

 	/* altitude */

 	if (*cp == '-') {

 		altsign = -1;

 		cp++;

 	}

 	if (*cp == '+')

 		cp++;

 	while (isdigit((unsigned char)*cp))

 		altmeters = altmeters * 10 + (*cp++ - '0');

 	if (*cp == '.') {		/* decimal meters */

 		cp++;

 		if (isdigit((unsigned char)*cp)) {

 			altfrac = (*cp++ - '0') * 10;

 			if (isdigit((unsigned char)*cp)) {

 				altfrac += (*cp++ - '0');

 			}

 		}

 	}

 	alt = (10000000 + (altsign * (altmeters * 100 + altfrac)));

 	while (!isspace((unsigned char)*cp) && (cp < maxcp)) /* if trailing garbage or m */

 		cp++;

 	while (isspace((unsigned char)*cp) && (cp < maxcp))

 		cp++;

 	if (cp >= maxcp)

 		goto defaults;

 	siz = precsize_aton(&cp);

 	while (!isspace((unsigned char)*cp) && (cp < maxcp))	/* if trailing garbage or m */

 		cp++;

 	while (isspace((unsigned char)*cp) && (cp < maxcp))

 		cp++;

 	if (cp >= maxcp)

 		goto defaults;

 	hp = precsize_aton(&cp);

 	while (!isspace((unsigned char)*cp) && (cp < maxcp))	/* if trailing garbage or m */

 		cp++;

 	while (isspace((unsigned char)*cp) && (cp < maxcp))

 		cp++;

 	if (cp >= maxcp)

 		goto defaults;

 	vp = precsize_aton(&cp);

  defaults:

 	bcp = binary;

 	*bcp++ = (u_int8_t) 0;	/* version byte */

 	*bcp++ = siz;

 	*bcp++ = hp;

 	*bcp++ = vp;

 	PUTLONG(latit,bcp);

 	PUTLONG(longit,bcp);

 	PUTLONG(alt,bcp);

 	return (16);		/* size of RR in octets */

 }

 #endif

 /* takes an on-the-wire LOC RR and formats it in a human readable format. */

 const char *

 loc_ntoa(binary, ascii)

 	const u_char *binary;

 	char *ascii;

 {

 	static const char *error = "?";

 	static char tmpbuf[sizeof

 "1000 60 60.000 N 1000 60 60.000 W -12345678.00m 90000000.00m 90000000.00m 90000000.00m"];

 	const u_char *cp = binary;

 	int latdeg, latmin, latsec, latsecfrac;

 	int longdeg, longmin, longsec, longsecfrac;

 	char northsouth, eastwest;

 	const char *altsign;

 	int altmeters, altfrac;

 	const u_int32_t referencealt = 100000 * 100;

 	int32_t latval, longval, altval;

 	u_int32_t templ;

 	u_int8_t sizeval, hpval, vpval, versionval;

 	char *sizestr, *hpstr, *vpstr;

 	versionval = *cp++;

 	if (ascii == NULL)

 		ascii = tmpbuf;

 	if (versionval) {

 		(void) sprintf(ascii, "; error: unknown LOC RR version");

 		return (ascii);

 	}

 	sizeval = *cp++;

 	hpval = *cp++;

 	vpval = *cp++;

 	GETLONG(templ, cp);

 	latval = (templ - ((unsigned)1<<31));

 	GETLONG(templ, cp);

 	longval = (templ - ((unsigned)1<<31));

 	GETLONG(templ, cp);

 	if (templ < referencealt) { /* below WGS 84 spheroid */

 		altval = referencealt - templ;

 		altsign = "-";

 	} else {

 		altval = templ - referencealt;

 		altsign = "";

 	}

 	if (latval < 0) {

 		northsouth = 'S';

 		latval = -latval;

 	} else

 		northsouth = 'N';

 	latsecfrac = latval % 1000;

 	latval = latval / 1000;

 	latsec = latval % 60;

 	latval = latval / 60;

 	latmin = latval % 60;

 	latval = latval / 60;

 	latdeg = latval;

 	if (longval < 0) {

 		eastwest = 'W';

 		longval = -longval;

 	} else

 		eastwest = 'E';

 	longsecfrac = longval % 1000;

 	longval = longval / 1000;

 	longsec = longval % 60;

 	longval = longval / 60;

 	longmin = longval % 60;

 	longval = longval / 60;

 	longdeg = longval;

 	altfrac = altval % 100;

 	altmeters = (altval / 100);

 	sizestr = strdup(precsize_ntoa((u_int32_t)sizeval));

 	hpstr = strdup(precsize_ntoa((u_int32_t)hpval));

 	vpstr = strdup(precsize_ntoa((u_int32_t)vpval));

 	sprintf(ascii,

 	    "%d %.2d %.2d.%.3d %c %d %.2d %.2d.%.3d %c %s%d.%.2dm %sm %sm %sm",

 		latdeg, latmin, latsec, latsecfrac, northsouth,

 		longdeg, longmin, longsec, longsecfrac, eastwest,

 		altsign, altmeters, altfrac,

 		(sizestr != NULL) ? sizestr : error,

 		(hpstr != NULL) ? hpstr : error,

 		(vpstr != NULL) ? vpstr : error);

 	if (sizestr != NULL)

 		free(sizestr);

 	if (hpstr != NULL)

 		free(hpstr);

 	if (vpstr != NULL)

 		free(vpstr);

 	return (ascii);

 }

 /* Return the number of DNS hierarchy levels in the name. */

 int

 dn_count_labels(const char *name) {

 	int i, len, count;

 	len = strlen(name);

 	for (i = 0, count = 0; i < len; i++) {

 		/* XXX need to check for \. or use named's nlabels(). */

 		if (name[i] == '.')

 			count++;

 	}

 	/* don't count initial wildcard */

 	if (name[0] == '*')

 		if (count)

 			count--;

 	/* don't count the null label for root. */

 	/* if terminating '.' not found, must adjust */

 	/* count to include last label */

 	if (len > 0 && name[len-1] != '.')

 		count++;

 	return (count);

 }

 /*

  * Make dates expressed in seconds-since-Jan-1-1970 easy to read.

  * SIG records are required to be printed like this, by the Secure DNS RFC.

  */

 char *

 p_secstodate (u_long secs) {

 	/* XXX nonreentrant */

 	static char output[15];		/* YYYYMMDDHHMMSS and null */

 	time_t myclock = secs;

 	struct tm *mytime;

 #ifdef HAVE_TIME_R

 	struct tm res;

 	mytime = gmtime_r(&myclock, &res);

 #else

 	mytime = gmtime(&myclock);

 #endif

 	mytime->tm_year += 1900;

 	mytime->tm_mon += 1;

 	sprintf(output, "%04d%02d%02d%02d%02d%02d",

 		mytime->tm_year, mytime->tm_mon, mytime->tm_mday,

 		mytime->tm_hour, mytime->tm_min, mytime->tm_sec);

 	return (output);

 }

 #ifndef MOZILLA_NECKO_EXCLUDE_CODE

 u_int16_t

 res_nametoclass(const char *buf, int *successp) {

 	unsigned long result;

 	char *endptr;

 	int success;

 	result = sym_ston(__p_class_syms, buf, &success);

 	if (success)

 		goto done;

 	if (strncasecmp(buf, "CLASS", 5) != 0 ||

 	    !isdigit((unsigned char)buf[5]))

 		goto done;

 	errno = 0;

 	result = strtoul(buf + 5, &endptr, 10);

 	if (errno == 0 && *endptr == '\0' && result <= 0xffffU)

 		success = 1;

  done:

 	if (successp)

 		*successp = success;

 	return (u_int16_t)(result);

 }

 u_int16_t

 res_nametotype(const char *buf, int *successp) {

 	unsigned long result;

 	char *endptr;

 	int success;

 	result = sym_ston(__p_type_syms, buf, &success);

 	if (success)

 		goto done;

 	if (strncasecmp(buf, "type", 4) != 0 ||

 	    !isdigit((unsigned char)buf[4]))

 		goto done;

 	errno = 0;

 	result = strtoul(buf + 4, &endptr, 10);

 	if (errno == 0 && *endptr == '\0' && result <= 0xffffU)

 		success = 1;

  done:

 	if (successp)

 		*successp = success;

 	return (u_int16_t)(result);

 }

 #endif