nslookup.c

bind-3.2.

/*
 * Copyright (C) 2000-2003  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.
 */

/* $Id: nslookup.c,v 1.90.2.5 2003/10/09 07:32:30 marka Exp $ */

#include <config.h>

#include <stdlib.h>

#include <isc/app.h>
#include <isc/buffer.h>
#include <isc/commandline.h>
#include <isc/event.h>
#include <isc/string.h>
#include <isc/timer.h>
#include <isc/util.h>
#include <isc/task.h>
#include <isc/netaddr.h>

#include <dns/message.h>
#include <dns/name.h>
#include <dns/fixedname.h>
#include <dns/rdata.h>
#include <dns/rdataclass.h>
#include <dns/rdataset.h>
#include <dns/rdatastruct.h>
#include <dns/rdatatype.h>
#include <dns/byaddr.h>

#include <dig/dig.h>

extern ISC_LIST(dig_lookup_t) lookup_list;
extern ISC_LIST(dig_server_t) server_list;
extern ISC_LIST(dig_searchlist_t) search_list;

extern isc_boolean_t have_ipv6, usesearch, qr, debugging;
extern in_port_t port;
extern unsigned int timeout;
extern isc_mem_t *mctx;
extern dns_messageid_t id;
extern int sendcount;
extern int ndots;
extern int tries;
extern int lookup_counter;
extern int exitcode;
extern isc_taskmgr_t *taskmgr;
extern isc_task_t *global_task;
extern char *progname;

static isc_boolean_t short_form = ISC_TRUE,
	tcpmode = ISC_FALSE, deprecation_msg = ISC_TRUE,
	identify = ISC_FALSE, stats = ISC_TRUE,
	comments = ISC_TRUE, section_question = ISC_TRUE,
	section_answer = ISC_TRUE, section_authority = ISC_TRUE,
	section_additional = ISC_TRUE, recurse = ISC_TRUE,
	aaonly = ISC_FALSE;
static isc_boolean_t in_use = ISC_FALSE;
static char defclass[MXRD] = "IN";
static char deftype[MXRD] = "A";
static isc_event_t *global_event = NULL;

static char domainopt[DNS_NAME_MAXTEXT];

static const char *rcodetext[] = {
	"NOERROR",
	"FORMERR",
	"SERVFAIL",
	"NXDOMAIN",
	"NOTIMP",
	"REFUSED",
	"YXDOMAIN",
	"YXRRSET",
	"NXRRSET",
	"NOTAUTH",
	"NOTZONE",
	"RESERVED11",
	"RESERVED12",
	"RESERVED13",
	"RESERVED14",
	"RESERVED15",
	"BADVERS"
};

static const char *rtypetext[] = {
	"rtype_0 = ",			/* 0 */
	"internet address = ",		/* 1 */
	"nameserver = ",		/* 2 */
	"md = ",			/* 3 */
	"mf = ",			/* 4 */
	"canonical name = ",		/* 5 */
	"soa = ",			/* 6 */
	"mb = ",			/* 7 */
	"mg = ",			/* 8 */
	"mr = ",			/* 9 */
	"rtype_10 = ",			/* 10 */
	"protocol = ",			/* 11 */
	"name = ",			/* 12 */
	"hinfo = ",			/* 13 */
	"minfo = ",			/* 14 */
	"mail exchanger = ",		/* 15 */
	"text = ",			/* 16 */
	"rp = ",       			/* 17 */
	"afsdb = ",			/* 18 */
	"x25 address = ",		/* 19 */
	"isdn address = ",		/* 20 */
	"rt = ",			/* 21 */
	"nsap = ",			/* 22 */
	"nsap_ptr = ",			/* 23 */
	"signature = ",			/* 24 */
	"key = ",			/* 25 */
	"px = ",			/* 26 */
	"gpos = ",			/* 27 */
	"has AAAA address ",		/* 28 */
	"loc = ",			/* 29 */
	"next = ",			/* 30 */
	"rtype_31 = ",			/* 31 */
	"rtype_32 = ",			/* 32 */
	"service = ",			/* 33 */
	"rtype_34 = ",			/* 34 */
	"naptr = ",			/* 35 */
	"kx = ",			/* 36 */
	"cert = ",			/* 37 */
	"v6 address = ",		/* 38 */
	"dname = ",			/* 39 */
	"rtype_40 = ",			/* 40 */
	"optional = "};			/* 41 */

#define N_KNOWN_RRTYPES (sizeof(rtypetext) / sizeof(rtypetext[0]))

static void flush_lookup_list(void);
static void getinput(isc_task_t *task, isc_event_t *event);

void
dighost_shutdown(void) {
	isc_event_t *event = global_event;

	flush_lookup_list();
	debug("dighost_shutdown()");

	if (!in_use) {
		isc_app_shutdown();
		return;
	}

	isc_task_send(global_task, &event);
}

static void
printsoa(dns_rdata_t *rdata) {
	dns_rdata_soa_t soa;
	isc_result_t result;
	char namebuf[DNS_NAME_FORMATSIZE];

	result = dns_rdata_tostruct(rdata, &soa, NULL);
	check_result(result, "dns_rdata_tostruct");

	dns_name_format(&soa.origin, namebuf, sizeof(namebuf));
	printf("\torigin = %s\n", namebuf);
	dns_name_format(&soa.contact, namebuf, sizeof(namebuf));
	printf("\tmail addr = %s\n", namebuf);
	printf("\tserial = %u\n", soa.serial);
	printf("\trefresh = %u\n", soa.refresh);
	printf("\tretry = %u\n", soa.retry);
	printf("\texpire = %u\n", soa.expire);
	printf("\tminimum = %u\n", soa.minimum);
	dns_rdata_freestruct(&soa);
}

static void
printa(dns_rdata_t *rdata) {
	isc_result_t result;
	char text[sizeof("255.255.255.255")];
	isc_buffer_t b;

	isc_buffer_init(&b, text, sizeof(text));
	result = dns_rdata_totext(rdata, NULL, &b);
	check_result(result, "dns_rdata_totext");
	printf("Address: %.*s\n", (int)isc_buffer_usedlength(&b),
	       (char *)isc_buffer_base(&b));
}

static void
printrdata(dns_rdata_t *rdata) {
	isc_result_t result;
	isc_buffer_t *b = NULL;
	unsigned int size = 1024;
	isc_boolean_t done = ISC_FALSE;

	if (rdata->type < N_KNOWN_RRTYPES)
		printf("%s", rtypetext[rdata->type]);
	else
		printf("rdata_%d = ", rdata->type);

	while (!done) {
		result = isc_buffer_allocate(mctx, &b, size);
		if (result != ISC_R_SUCCESS)
			check_result(result, "isc_buffer_allocate");
		result = dns_rdata_totext(rdata, NULL, b);
		if (result == ISC_R_SUCCESS) {
			printf("%.*s\n", (int)isc_buffer_usedlength(b),
			       (char *)isc_buffer_base(b));
			done = ISC_TRUE;
		} else if (result != ISC_R_NOSPACE)
			check_result(result, "dns_rdata_totext");
		isc_buffer_free(&b);
		size *= 2;
	}
}

static isc_result_t
printsection(dig_query_t *query, dns_message_t *msg, isc_boolean_t headers,
	     dns_section_t section) {
	isc_result_t result, loopresult;
	dns_name_t *name;
	dns_rdataset_t *rdataset = NULL;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	char namebuf[DNS_NAME_FORMATSIZE];

	UNUSED(query);
	UNUSED(headers);

	debug("printsection()");

	result = dns_message_firstname(msg, section);
	if (result == ISC_R_NOMORE)
		return (ISC_R_SUCCESS);
	else if (result != ISC_R_SUCCESS)
		return (result);
	for (;;) {
		name = NULL;
		dns_message_currentname(msg, section,
					&name);
		for (rdataset = ISC_LIST_HEAD(name->list);
		     rdataset != NULL;
		     rdataset = ISC_LIST_NEXT(rdataset, link)) {
			loopresult = dns_rdataset_first(rdataset);
			while (loopresult == ISC_R_SUCCESS) {
				dns_rdataset_current(rdataset, &rdata);
				switch (rdata.type) {
				case dns_rdatatype_a:
					if (section != DNS_SECTION_ANSWER)
						goto def_short_section;
					dns_name_format(name, namebuf,
							sizeof(namebuf));
					printf("Name:\t%s\n", namebuf);
					printa(&rdata);
					break;
				case dns_rdatatype_soa:
					dns_name_format(name, namebuf,
							sizeof(namebuf));
					printf("%s\n", namebuf);
					printsoa(&rdata);
					break;
				default:
				def_short_section:
					dns_name_format(name, namebuf,
							sizeof(namebuf));
					printf("%s\t", namebuf);
					printrdata(&rdata);
					break;
				}
				dns_rdata_reset(&rdata);
				loopresult = dns_rdataset_next(rdataset);
			}
		}
		result = dns_message_nextname(msg, section);
		if (result == ISC_R_NOMORE)
			break;
		else if (result != ISC_R_SUCCESS) {
			return (result);
		}
	}
	return (ISC_R_SUCCESS);
}

static isc_result_t
detailsection(dig_query_t *query, dns_message_t *msg, isc_boolean_t headers,
	     dns_section_t section) {
	isc_result_t result, loopresult;
	dns_name_t *name;
	dns_rdataset_t *rdataset = NULL;
	dns_rdata_t rdata = DNS_RDATA_INIT;
	char namebuf[DNS_NAME_FORMATSIZE];

	UNUSED(query);

	debug("detailsection()");

	if (headers) {
		switch (section) {
		case DNS_SECTION_QUESTION:
			puts("    QUESTIONS:");
			break;
		case DNS_SECTION_ANSWER:
			puts("    ANSWERS:");
			break;
		case DNS_SECTION_AUTHORITY:
			puts("    AUTHORITY RECORDS:");
			break;
		case DNS_SECTION_ADDITIONAL:
			puts("    ADDITIONAL RECORDS:");
			break;
		}
	}

	result = dns_message_firstname(msg, section);
	if (result == ISC_R_NOMORE)
		return (ISC_R_SUCCESS);
	else if (result != ISC_R_SUCCESS)
		return (result);
	for (;;) {
		name = NULL;
		dns_message_currentname(msg, section,
					&name);
		for (rdataset = ISC_LIST_HEAD(name->list);
		     rdataset != NULL;
		     rdataset = ISC_LIST_NEXT(rdataset, link)) {
			if (section == DNS_SECTION_QUESTION) {
				dns_name_format(name, namebuf,
						sizeof(namebuf));
				printf("\t%s, ", namebuf);
				dns_rdatatype_format(rdataset->type,
						     namebuf,
						     sizeof(namebuf));
				printf("type = %s, ", namebuf);
				dns_rdataclass_format(rdataset->rdclass,
						      namebuf,
						      sizeof(namebuf));
				printf("class = %s\n", namebuf);
			}
			loopresult = dns_rdataset_first(rdataset);
			while (loopresult == ISC_R_SUCCESS) {
				dns_rdataset_current(rdataset, &rdata);

				dns_name_format(name, namebuf,
						sizeof(namebuf));
				printf("    ->  %s\n", namebuf);

				switch (rdata.type) {
				case dns_rdatatype_soa:
					printsoa(&rdata);
					break;
				default:
					printf("\t");
					printrdata(&rdata);
				}
				dns_rdata_reset(&rdata);
				loopresult = dns_rdataset_next(rdataset);
			}
		}
		result = dns_message_nextname(msg, section);
		if (result == ISC_R_NOMORE)
			break;
		else if (result != ISC_R_SUCCESS) {
			return (result);
		}
	}
	return (ISC_R_SUCCESS);
}

void
received(int bytes, isc_sockaddr_t *from, dig_query_t *query)
{
	UNUSED(bytes);
	UNUSED(from);
	UNUSED(query);
}

void
trying(char *frm, dig_lookup_t *lookup) {
	UNUSED(frm);
	UNUSED(lookup);

}

isc_result_t
printmessage(dig_query_t *query, dns_message_t *msg, isc_boolean_t headers) {
	char servtext[ISC_SOCKADDR_FORMATSIZE];	

	debug("printmessage()");

	isc_sockaddr_format(&query->sockaddr, servtext, sizeof(servtext));
	printf("Server:\t\t%s\n", query->servname);
	printf("Address:\t%s\n", servtext);
	
	puts("");

	if (!short_form) {
		isc_boolean_t headers = ISC_TRUE;
		puts("------------");
		/*		detailheader(query, msg);*/
		detailsection(query, msg, headers, DNS_SECTION_QUESTION);
		detailsection(query, msg, headers, DNS_SECTION_ANSWER);
		detailsection(query, msg, headers, DNS_SECTION_AUTHORITY);
		detailsection(query, msg, headers, DNS_SECTION_ADDITIONAL);
		puts("------------");
	}

	if (msg->rcode != 0) {
		char nametext[DNS_NAME_FORMATSIZE];
		dns_name_format(query->lookup->name,
				nametext, sizeof(nametext));
		printf("** server can't find %s: %s\n", nametext,
		       rcodetext[msg->rcode]);
		debug("returning with rcode == 0");
		return (ISC_R_SUCCESS);
	}

	if ((msg->flags & DNS_MESSAGEFLAG_AA) == 0)
		puts("Non-authoritative answer:");
	if (!ISC_LIST_EMPTY(msg->sections[DNS_SECTION_ANSWER]))
		printsection(query, msg, headers, DNS_SECTION_ANSWER);
	else
		printf("*** Can't find %s: No answer\n",
		       query->lookup->textname);

	if (((msg->flags & DNS_MESSAGEFLAG_AA) == 0) &&
	    (query->lookup->rdtype != dns_rdatatype_a)) {
		puts("\nAuthoritative answers can be found from:");
		printsection(query, msg, headers,
			     DNS_SECTION_AUTHORITY);
		printsection(query, msg, headers,
			     DNS_SECTION_ADDITIONAL);
	}
	return (ISC_R_SUCCESS);
}