res_debug.c

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 * 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.
 */

/*
 * Portions Copyright (c) 1996 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)res_debug.c	8.1 (Berkeley) 6/4/93";
static char rcsid[] = "$Id: res_debug.c,v 1.2 1998/08/20 21:47:36 joel Exp $";
#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.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#define SPRINTF(x) sprintf x

extern const char *_res_opcodes[];
extern const char *_res_resultcodes[];
extern const char *_res_sectioncodes[];

/*
 * Print the current options.
 */
void
fp_resstat(struct __res_state *statp, FILE *file) {
	u_long mask;

	fprintf(file, ";; res options:");
	if (!statp)
		statp = &_res;
	for (mask = 1;  mask != 0;  mask <<= 1)
		if (statp->options & mask)
			fprintf(file, " %s", p_option(mask));
	putc('\n', file);
}

static void
do_section(ns_msg *handle, ns_sect section, int pflag, FILE *file) {
	int n, sflag, rrnum;
	char buf[2048];	/* XXX need to malloc */
	ns_opcode opcode;
	ns_rr rr;

	/*
	 * Print answer records.
	 */
	sflag = (_res.pfcode & pflag);
	if (_res.pfcode && !sflag)
		return;

	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 &&
				 (_res.pfcode & RES_PRF_HEAD1))
				putc('\n', file);
			return;
		}
		if (rrnum == 0 && sflag != 0 && (_res.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 {
			n = ns_sprintrr(handle, &rr, NULL, NULL,
					buf, sizeof buf);
			if (n < 0) {
				fprintf(file, ";; ns_sprintrr: %s\n",
					strerror(errno));
				return;
			}
			fputs(buf, file);
			fputc('\n', file);
		}
		rrnum++;
	}
}

void
p_query(const u_char *msg) {
	fp_query(msg, stdout);
}

void
fp_query(const u_char *msg, FILE *file) {
	fp_nquery(msg, PACKETSZ, file);
}

/*
 * Print the contents of a query.
 * This is intended to be primarily a debugging routine.
 */
void
fp_nquery(const u_char *msg, int len, FILE *file) {
	ns_msg handle;
	int qdcount, ancount, nscount, arcount;
	u_int opcode, rcode, id;

	if ((_res.options & RES_INIT) == 0 && res_init() == -1)
		return;

	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 ((!_res.pfcode) || (_res.pfcode & RES_PRF_HEADX) || rcode)
		fprintf(file,
			";; ->>HEADER<<- opcode: %s, status: %s, id: %d\n",
			_res_opcodes[opcode], _res_resultcodes[rcode], id);
	if ((!_res.pfcode) || (_res.pfcode & RES_PRF_HEADX))
		putc(';', file);
	if ((!_res.pfcode) || (_res.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 ((!_res.pfcode) || (_res.pfcode & RES_PRF_HEAD1)) {
		fprintf(file, "; %s: %d",
			p_section(ns_s_qd, opcode), qdcount);
		fprintf(file, ", %s: %d",
			p_section(ns_s_an, opcode), ancount);
		fprintf(file, ", %s: %d",
			p_section(ns_s_ns, opcode), nscount);
		fprintf(file, ", %s: %d",
			p_section(ns_s_ar, opcode), arcount);
	}
	if ((!_res.pfcode) || (_res.pfcode & 
		(RES_PRF_HEADX | RES_PRF_HEAD2 | RES_PRF_HEAD1))) {
		putc('\n',file);
	}
	/*
	 * Print the various sections.
	 */
	do_section(&handle, ns_s_qd, RES_PRF_QUES, file);
	do_section(&handle, ns_s_an, RES_PRF_ANS, file);
	do_section(&handle, ns_s_ns, RES_PRF_AUTH, file);
	do_section(&handle, ns_s_ar, RES_PRF_ADD, file);
	if (qdcount == 0 && ancount == 0 &&
	    nscount == 0 && arcount == 0)
		putc('\n', file);
}

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);
}

/*
 * 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"},
	{C_CHAOS,	"CHAOS"},
	{C_HS,		"HS"},
	{C_HS,		"HESIOD"},
	{C_ANY,		"ANY"},
	{C_NONE,	"NONE"},
	{C_IN, 		(char *)0}
};

/*
 * Names of message sections.
 */
const struct res_sym __p_default_section_syms[] = {
	{ns_s_qd,	"QUERY"},
	{ns_s_an,	"ANSWER"},
	{ns_s_ns,	"AUTHORITY"},
	{ns_s_ar,	"ADDITIONAL"},
	{0,             (char *)0}
};

const struct res_sym __p_update_section_syms[] = {
	{S_ZONE,	"ZONE"},
	{S_PREREQ,	"PREREQUISITE"},
	{S_UPDATE,	"UPDATE"},
	{S_ADDT,	"ADDITIONAL"},
	{0,             (char *)0}
};

/*
 * 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[] = {
	{T_A,		"A",		"address"},
	{T_NS,		"NS",		"name server"},
	{T_MD,		"MD",		"mail destination (deprecated)"},
	{T_MF,		"MF",		"mail forwarder (deprecated)"},
	{T_CNAME,	"CNAME",	"canonical name"},
	{T_SOA,		"SOA",		"start of authority"},
	{T_MB,		"MB",		"mailbox"},
	{T_MG,		"MG",		"mail group member"},
	{T_MR,		"MR",		"mail rename"},
	{T_NULL,	"NULL",		"null"},
	{T_WKS,		"WKS",		"well-known service (deprecated)"},
	{T_PTR,		"PTR",		"domain name pointer"},
	{T_HINFO,	"HINFO",	"host information"},
	{T_MINFO,	"MINFO",	"mailbox information"},
	{T_MX,		"MX",		"mail exchanger"},
	{T_TXT,		"TXT",		"text"},
	{T_RP,		"RP",		"responsible person"},
	{T_AFSDB,	"AFSDB",	"DCE or AFS server"},
	{T_X25,		"X25",		"X25 address"},
	{T_ISDN,	"ISDN",		"ISDN address"},
	{T_RT,		"RT",		"router"},
	{T_NSAP,	"NSAP",		"nsap address"},
	{T_NSAP_PTR,	"NSAP_PTR",	"domain name pointer"},
	{T_SIG,		"SIG",		"signature"},
	{T_KEY,		"KEY",		"key"},
	{T_PX,		"PX",		"mapping information"},
	{T_GPOS,	"GPOS",		"geographical position (withdrawn)"},
	{T_AAAA,	"AAAA",		"IPv6 address"},
	{T_LOC,		"LOC",		"location"},
	{T_NXT,		"NXT",		"next valid name (unimplemented)"},
	{T_EID,		"EID",		"endpoint identifier (unimplemented)"},
	{T_NIMLOC,	"NIMLOC",	"NIMROD locator (unimplemented)"},
	{T_SRV,		"SRV",		"server selection"},
	{T_ATMA,	"ATMA",		"ATM address (unimplemented)"},
	{T_IXFR,	"IXFR",		"incremental zone transfer"},
	{T_AXFR,	"AXFR",		"zone transfer"},
	{T_MAILB,	"MAILB",	"mailbox-related data (deprecated)"},
	{T_MAILA,	"MAILA",	"mail agent (deprecated)"},
	{T_NAPTR,	"NAPTR",	"URN Naming Authority"},
	{T_ANY,		"ANY",		"\"any\""},
	{0, 		NULL,		NULL}
};

int
sym_ston(const struct res_sym *syms, const char *name, int *success) {
	for ((void)NULL; 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 ((void)NULL; syms->name != 0; syms++) {
		if (number == syms->number) {
			if (success)
				*success = 1;
			return (syms->name);
		}
	}

	sprintf(unname, "%d", number);
	if (success)
		*success = 0;
	return (unname);
}

const char *
sym_ntop(const struct res_sym *syms, int number, int *success) {
	static char unname[20];

	for ((void)NULL; syms->name != 0; syms++) {
		if (number == syms->number) {
			if (success)
				*success = 1;
			return (syms->humanname);
		}
	}
	sprintf(unname, "%d", number);
	if (success)
		*success = 0;
	return (unname);
}

/*
 * Return a string for the type.
 */
const char *
p_type(int type) {
	return (sym_ntos(__p_type_syms, type, (int *)0));
}

/*
 * 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: