C++ dns_fixedname_init函数代码示例

isc_result_t
dns_tsigkeyring_dumpanddetach(dns_tsig_keyring_t **ringp, FILE *fp) {
	isc_result_t result;
	dns_rbtnodechain_t chain;
	dns_name_t foundname;
	dns_fixedname_t fixedorigin;
	dns_name_t *origin;
	isc_stdtime_t now;
	dns_rbtnode_t *node;
	dns_tsigkey_t *tkey;
	dns_tsig_keyring_t *ring;
	unsigned int references;

	REQUIRE(ringp != NULL && *ringp != NULL);

	ring = *ringp;
	*ringp = NULL;

	RWLOCK(&ring->lock, isc_rwlocktype_write);
	INSIST(ring->references > 0);
	ring->references--;
	references = ring->references;
	RWUNLOCK(&ring->lock, isc_rwlocktype_write);

	if (references != 0)
		return (DNS_R_CONTINUE);

	isc_stdtime_get(&now);
	dns_name_init(&foundname, NULL);
	dns_fixedname_init(&fixedorigin);
	origin = dns_fixedname_name(&fixedorigin);
	dns_rbtnodechain_init(&chain, ring->mctx);
	result = dns_rbtnodechain_first(&chain, ring->keys, &foundname,
					origin);
	if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
		dns_rbtnodechain_invalidate(&chain);
		goto destroy;
	}

	for (;;) {
		node = NULL;
		dns_rbtnodechain_current(&chain, &foundname, origin, &node);
		tkey = node->data;
		if (tkey != NULL && tkey->generated && tkey->expire >= now)
			dump_key(tkey, fp);
		result = dns_rbtnodechain_next(&chain, &foundname,
					       origin);
		if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
			dns_rbtnodechain_invalidate(&chain);
			if (result == ISC_R_NOMORE)
				result = ISC_R_SUCCESS;
			goto destroy;
		}
	}

 destroy:
	destroyring(ring);
	return (result);
}

/*%
 * Configure an apex NS with an out-of-zone NS names for a static-stub zone.
 * For example, for the zone named "example.com", something like the following
 * RRs will be added to the zone DB:
 * example.com. NS ns.example.net.
 */
static isc_result_t
configure_staticstub_servernames(const cfg_obj_t *zconfig, dns_zone_t *zone,
				 dns_rdatalist_t *rdatalist, const char *zname)
{
	const cfg_listelt_t *element;
	isc_mem_t *mctx = dns_zone_getmctx(zone);
	dns_rdata_t *rdata;
	isc_region_t sregion, region;
	isc_result_t result = ISC_R_SUCCESS;

	for (element = cfg_list_first(zconfig);
	     element != NULL;
	     element = cfg_list_next(element))
	{
		const cfg_obj_t *obj;
		const char *str;
		dns_fixedname_t fixed_name;
		dns_name_t *nsname;
		isc_buffer_t b;

		obj = cfg_listelt_value(element);
		str = cfg_obj_asstring(obj);

		dns_fixedname_init(&fixed_name);
		nsname = dns_fixedname_name(&fixed_name);

		isc_buffer_init(&b, str, strlen(str));
		isc_buffer_add(&b, strlen(str));
		result = dns_name_fromtext(nsname, &b, dns_rootname, 0, NULL);
		if (result != ISC_R_SUCCESS) {
			cfg_obj_log(zconfig, ns_g_lctx, ISC_LOG_ERROR,
					    "server-name '%s' is not a valid "
					    "name", str);
			return (result);
		}
		if (dns_name_issubdomain(nsname, dns_zone_getorigin(zone))) {
			cfg_obj_log(zconfig, ns_g_lctx, ISC_LOG_ERROR,
				    "server-name '%s' must not be a "
				    "subdomain of zone name '%s'",
				    str, zname);
			return (ISC_R_FAILURE);
		}

		dns_name_toregion(nsname, &sregion);
		rdata = isc_mem_get(mctx, sizeof(*rdata) + sregion.length);
		if (rdata == NULL)
			return (ISC_R_NOMEMORY);
		region.length = sregion.length;
		region.base = (unsigned char *)(rdata + 1);
		memcpy(region.base, sregion.base, region.length);
		dns_rdata_init(rdata);
		dns_rdata_fromregion(rdata, dns_zone_getclass(zone),
				     dns_rdatatype_ns, &region);
		ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
	}

	return (result);
}

static void
iterate(dns_rbt_t *rbt, isc_boolean_t forward) {
	dns_name_t foundname, *origin;
	dns_rbtnodechain_t chain;
	dns_fixedname_t fixedorigin;
	isc_result_t result;
	isc_result_t (*move)(dns_rbtnodechain_t *chain, dns_name_t *name,
			     dns_name_t *origin);

	dns_rbtnodechain_init(&chain, mctx);

	dns_name_init(&foundname, NULL);
	dns_fixedname_init(&fixedorigin);
	origin = dns_fixedname_name(&fixedorigin);

	if (forward) {
		printf("iterating forward\n" );
		move = dns_rbtnodechain_next;

		result = dns_rbtnodechain_first(&chain, rbt, &foundname,
						origin);

	} else {
		printf("iterating backward\n" );
		move = dns_rbtnodechain_prev;

		result = dns_rbtnodechain_last(&chain, rbt, &foundname,
					       origin);
	}

	if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN)
		printf("start not found!\n");

	else {
		for (;;) {
			if (result == DNS_R_NEWORIGIN) {
				printf("  new origin: ");
				print_name(origin);
				printf("\n");
			}

			if (result == ISC_R_SUCCESS ||
			    result == DNS_R_NEWORIGIN) {
				print_name(&foundname);
				printf("\n");

			} else {
				if (result != ISC_R_NOMORE)
				       printf("UNEXEPCTED ITERATION ERROR: %s",
					      dns_result_totext(result));
				break;
			}

			result = move(&chain, &foundname, origin);
		}
	}
}

isc_result_t
dns_nsec3_hashname(dns_fixedname_t *result,
		   unsigned char rethash[NSEC3_MAX_HASH_LENGTH],
		   size_t *hash_length, dns_name_t *name, dns_name_t *origin,
		   dns_hash_t hashalg, unsigned int iterations,
		   const unsigned char *salt, size_t saltlength)
{
	unsigned char hash[NSEC3_MAX_HASH_LENGTH];
	unsigned char nametext[DNS_NAME_FORMATSIZE];
	dns_fixedname_t fixed;
	dns_name_t *downcased;
	isc_buffer_t namebuffer;
	isc_region_t region;
	size_t len;

	if (rethash == NULL)
		rethash = hash;

	memset(rethash, 0, NSEC3_MAX_HASH_LENGTH);

	dns_fixedname_init(&fixed);
	downcased = dns_fixedname_name(&fixed);
	dns_name_downcase(name, downcased, NULL);

	/* hash the node name */
	len = isc_iterated_hash(rethash, hashalg, iterations, salt, saltlength,
				downcased->ndata, downcased->length);
	if (len == 0U)
		return (DNS_R_BADALG);

	if (hash_length != NULL)
		*hash_length = len;

	/* convert the hash to base32hex */
	region.base = rethash;
	region.length = len;
	isc_buffer_init(&namebuffer, nametext, sizeof nametext);
	isc_base32hex_totext(&region, 1, "", &namebuffer);

	/* convert the hex to a domain name */
	dns_fixedname_init(result);
	return (dns_name_fromtext(dns_fixedname_name(result), &namebuffer,
				  origin, 0, NULL));
}

int
main(int argc, char **argv) {
	dns_fixedname_t fixed;
	dns_name_t *name;
	isc_buffer_t buffer;
	isc_region_t region;
	isc_result_t result;
	unsigned char hash[NSEC3_MAX_HASH_LENGTH];
	unsigned char salt[DNS_NSEC3_SALTSIZE];
	unsigned char text[1024];
	unsigned int hash_alg;
	unsigned int length;
	unsigned int iterations;
	unsigned int salt_length;

	if (argc != 5)
		usage();

	if (strcmp(argv[1], "-") == 0) {
		salt_length = 0;
		salt[0] = 0;
	} else {
		isc_buffer_init(&buffer, salt, sizeof(salt));
		result = isc_hex_decodestring(argv[1], &buffer);
		check_result(result, "isc_hex_decodestring(salt)");
		salt_length = isc_buffer_usedlength(&buffer);
		if (salt_length > DNS_NSEC3_SALTSIZE)
			fatal("salt too long");
	}
	hash_alg = atoi(argv[2]);
	if (hash_alg > 255U)
		fatal("hash algorithm too large");
	iterations = atoi(argv[3]);
	if (iterations > 0xffffU)
		fatal("iterations to large");

	dns_fixedname_init(&fixed);
	name = dns_fixedname_name(&fixed);
	isc_buffer_init(&buffer, argv[4], strlen(argv[4]));
	isc_buffer_add(&buffer, strlen(argv[4]));
	result = dns_name_fromtext(name, &buffer, dns_rootname, 0, NULL);
	check_result(result, "dns_name_fromtext() failed");

	dns_name_downcase(name, name, NULL);
	length = isc_iterated_hash(hash, hash_alg, iterations,  salt,
				   salt_length, name->ndata, name->length);
	if (length == 0)
		fatal("isc_iterated_hash failed");
	region.base = hash;
	region.length = length;
	isc_buffer_init(&buffer, text, sizeof(text));
	isc_base32hexnp_totext(&region, 1, "", &buffer);
	fprintf(stdout, "%.*s (salt=%s, hash=%u, iterations=%u)\n",
		(int)isc_buffer_usedlength(&buffer), text, argv[1], hash_alg, iterations);
	return(0);
}

static void
do_find(isc_boolean_t want_event) {
	isc_result_t result;
	isc_boolean_t done = ISC_FALSE;
	unsigned int options;

	options = DNS_ADBFIND_INET | DNS_ADBFIND_INET6;
	if (want_event)
		options |= DNS_ADBFIND_WANTEVENT | DNS_ADBFIND_EMPTYEVENT;
	dns_fixedname_init(&target);
	result = dns_adb_createfind(view->adb, task, adb_callback, NULL,
				    dns_fixedname_name(&fixed),
				    dns_rootname, 0, options, 0,
				    dns_fixedname_name(&target), 0,
				    &find);
	if (result == ISC_R_SUCCESS) {
		if (!ISC_LIST_EMPTY(find->list)) {
			/*
			 * We have at least some of the addresses for the
			 * name.
			 */
			INSIST((find->options & DNS_ADBFIND_WANTEVENT) == 0);
			print_addresses(find);
			done = ISC_TRUE;
		} else {
			/*
			 * We don't know any of the addresses for this
			 * name.
			 */
			if ((find->options & DNS_ADBFIND_WANTEVENT) == 0) {
				/*
				 * And ADB isn't going to send us any events
				 * either.  This query loses.
				 */
				done = ISC_TRUE;
			}
			/*
			 * If the DNS_ADBFIND_WANTEVENT flag was set, we'll
			 * get an event when something happens.
			 */
		}
	} else if (result == DNS_R_ALIAS) {
		print_name(dns_fixedname_name(&target));
		done = ISC_TRUE;
	} else {
		printf("dns_adb_createfind() returned %s\n",
		       isc_result_totext(result));
		done = ISC_TRUE;
	}

	if (done) {
		if (find != NULL)
			dns_adb_destroyfind(&find);
		isc_app_shutdown();
	}
}

isc_result_t
dns_dlzfindzone(dns_view_t *view, dns_name_t *name, unsigned int minlabels,
		dns_db_t **dbp)
{
	dns_fixedname_t fname;
	dns_name_t *zonename;
	unsigned int namelabels;
	unsigned int i;
	isc_result_t result;
	dns_dlzfindzone_t findzone;
	dns_dlzdb_t *dlzdatabase;

	/*
	 * Performs checks to make sure data is as we expect it to be.
	 */
	REQUIRE(DNS_DLZ_VALID(view->dlzdatabase));
	REQUIRE(name != NULL);
	REQUIRE(dbp != NULL && *dbp == NULL);

	/* setup a "fixed" dns name */
	dns_fixedname_init(&fname);
	zonename = dns_fixedname_name(&fname);

	/* count the number of labels in the name */
	namelabels = dns_name_countlabels(name);

	/*
	 * loop through starting with the longest domain name and
	 * trying shorter names portions of the name until we find a
	 * match, have an error, or are below the 'minlabels'
	 * threshold.  minlabels is 0, if the standard database didn't
	 * have a zone name match.  Otherwise minlabels is the number
	 * of labels in that name.  We need to beat that for a
	 * "better" match for the DLZ database to be authoritative
	 * instead of the standard database.
	 */
	for (i = namelabels; i > minlabels && i > 1; i--) {
		if (i == namelabels) {
			result = dns_name_copy(name, zonename, NULL);
			if (result != ISC_R_SUCCESS)
				return (result);
		} else
			dns_name_split(name, i, NULL, zonename);

		/* ask SDLZ driver if the zone is supported */
		dlzdatabase = view->dlzdatabase;
		findzone = dlzdatabase->implementation->methods->findzone;
		result = (*findzone)(dlzdatabase->implementation->driverarg,
				     dlzdatabase->dbdata, dlzdatabase->mctx,
				     view->rdclass, zonename, dbp);
		if (result != ISC_R_NOTFOUND)
			return (result);
	}
	return (ISC_R_NOTFOUND);
}

static isc_result_t probe_domain (struct probe_trans *trans)
{
    isc_result_t result;

    size_t domainlen;

    isc_buffer_t b;

    char buf[4096];                /* XXX ad hoc constant, but should be enough */

    char *cp;

    REQUIRE (trans != NULL);
    REQUIRE (trans->inuse == ISC_FALSE);
    REQUIRE (outstanding_probes < MAX_PROBES);

    /* Construct domain */
    cp = fgets (buf, sizeof (buf), fp);
    if (cp == NULL)
        return (ISC_R_NOMORE);
    if ((cp = strchr (buf, '\n')) != NULL)    /* zap NL if any */
        *cp = '\0';
    trans->domain = isc_mem_strdup (mctx, buf);
    if (trans->domain == NULL)
    {
        fprintf (stderr, "failed to allocate memory for domain: %s", cp);
        return (ISC_R_NOMEMORY);
    }

    /* Start getting NS for the domain */
    domainlen = strlen (buf);
    isc_buffer_init (&b, buf, domainlen);
    isc_buffer_add (&b, domainlen);
    dns_fixedname_init (&trans->fixedname);
    trans->qname = dns_fixedname_name (&trans->fixedname);
    result = dns_name_fromtext (trans->qname, &b, dns_rootname, 0, NULL);
    if (result != ISC_R_SUCCESS)
        goto cleanup;
    result = dns_client_startresolve (client, trans->qname,
                                      dns_rdataclass_in, dns_rdatatype_ns,
                                      0, probe_task, resolve_ns, trans, &trans->resid);
    if (result != ISC_R_SUCCESS)
        goto cleanup;

    trans->inuse = ISC_TRUE;
    outstanding_probes++;

    return (ISC_R_SUCCESS);

  cleanup:
    isc_mem_free (mctx, trans->domain);
    dns_fixedname_invalidate (&trans->fixedname);

    return (result);
}

static isc_result_t
make_querymessage(dns_message_t *message, const char *namestr,
		  dns_rdatatype_t rdtype)
{
	dns_name_t *qname = NULL, *qname0;
	dns_rdataset_t *qrdataset = NULL;
	isc_result_t result;
	isc_buffer_t b;
	unsigned int namelen;

	REQUIRE(message != NULL);
	REQUIRE(namestr != NULL);

	/* Construct qname */
	namelen = strlen(namestr);
	isc_buffer_constinit(&b, namestr, namelen);
	isc_buffer_add(&b, namelen);
	dns_fixedname_init(&fixedqname);
	qname0 = dns_fixedname_name(&fixedqname);
	result = dns_name_fromtext(qname0, &b, dns_rootname, 0, NULL);
	if (result != ISC_R_SUCCESS) {
		fprintf(stderr, "failed to convert qname: %d\n", result);
		return (result);
	}

	/* Construct query message */
	message->opcode = dns_opcode_query;
	message->rdclass = dns_rdataclass_in;

	result = dns_message_gettempname(message, &qname);
	if (result != ISC_R_SUCCESS)
		goto cleanup;

	result = dns_message_gettemprdataset(message, &qrdataset);
	if (result != ISC_R_SUCCESS)
		goto cleanup;

	dns_name_init(qname, NULL);
	dns_name_clone(qname0, qname);
	dns_rdataset_init(qrdataset);
	dns_rdataset_makequestion(qrdataset, message->rdclass, rdtype);
	ISC_LIST_APPEND(qname->list, qrdataset, link);
	dns_message_addname(message, qname, DNS_SECTION_QUESTION);

	return (ISC_R_SUCCESS);

 cleanup:
	if (qname != NULL)
		dns_message_puttempname(message, &qname);
	if (qrdataset != NULL)
		dns_message_puttemprdataset(message, &qrdataset);
	dns_message_destroy(&message);
	return (result);
}

/*
 * Find a few nodes to destroy if possible.
 */
static void
cleanup_ring(dns_tsig_keyring_t *ring)
{
	isc_result_t result;
	dns_rbtnodechain_t chain;
	dns_name_t foundname;
	dns_fixedname_t fixedorigin;
	dns_name_t *origin;
	isc_stdtime_t now;
	dns_rbtnode_t *node;
	dns_tsigkey_t *tkey;

	/*
	 * Start up a new iterator each time.
	 */
	isc_stdtime_get(&now);
	dns_name_init(&foundname, NULL);
	dns_fixedname_init(&fixedorigin);
	origin = dns_fixedname_name(&fixedorigin);

 again:
	dns_rbtnodechain_init(&chain, ring->mctx);
	result = dns_rbtnodechain_first(&chain, ring->keys, &foundname,
					origin);
	if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
		dns_rbtnodechain_invalidate(&chain);
		return;
	}

	for (;;) {
		node = NULL;
		dns_rbtnodechain_current(&chain, &foundname, origin, &node);
		tkey = node->data;
		if (tkey != NULL) {
			if (tkey->generated
			    && isc_refcount_current(&tkey->refs) == 1
			    && tkey->inception != tkey->expire
			    && tkey->expire < now) {
				tsig_log(tkey, 2, "tsig expire: deleting");
				/* delete the key */
				dns_rbtnodechain_invalidate(&chain);
				remove_fromring(tkey);
				goto again;
			}
		}
		result = dns_rbtnodechain_next(&chain, &foundname,
					       origin);
		if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
			dns_rbtnodechain_invalidate(&chain);
			return;
		}
	}
}

static void
setup(const char *zonename, const char *filename, const char *classname) {
	isc_result_t result;
	dns_rdataclass_t rdclass;
	isc_consttextregion_t region;
	isc_buffer_t buffer;
	dns_fixedname_t fixorigin;
	dns_name_t *origin;
	const char *rbt = "rbt";

	if (debug)
		fprintf(stderr, "loading \"%s\" from \"%s\" class \"%s\"\n",
			zonename, filename, classname);
	result = dns_zone_create(&zone, mctx);
	ERRRET(result, "dns_zone_new");

	dns_zone_settype(zone, zonetype);

	isc_buffer_init(&buffer, zonename, strlen(zonename));
	isc_buffer_add(&buffer, strlen(zonename));
	dns_fixedname_init(&fixorigin);
	result = dns_name_fromtext(dns_fixedname_name(&fixorigin),
				   &buffer, dns_rootname, 0, NULL);
	ERRRET(result, "dns_name_fromtext");
	origin = dns_fixedname_name(&fixorigin);

	result = dns_zone_setorigin(zone, origin);
	ERRRET(result, "dns_zone_setorigin");

	result = dns_zone_setdbtype(zone, 1, &rbt);
	ERRRET(result, "dns_zone_setdatabase");

	result = dns_zone_setfile(zone, filename);
	ERRRET(result, "dns_zone_setfile");

	region.base = classname;
	region.length = strlen(classname);
	result = dns_rdataclass_fromtext(&rdclass,
					 (isc_textregion_t *)(void*)&region);
	ERRRET(result, "dns_rdataclass_fromtext");

	dns_zone_setclass(zone, rdclass);

	if (zonetype == dns_zone_slave)
		dns_zone_setmasters(zone, &addr, 1);

	result = dns_zone_load(zone);
	ERRRET(result, "dns_zone_load");

	result = dns_zonemgr_managezone(zonemgr, zone);
	ERRRET(result, "dns_zonemgr_managezone");
}

static isc_result_t
initname(char *setname) {
	isc_result_t result;
	isc_buffer_t buf;

	dns_fixedname_init(&fixed);
	name = dns_fixedname_name(&fixed);

	isc_buffer_init(&buf, setname, strlen(setname));
	isc_buffer_add(&buf, strlen(setname));
	result = dns_name_fromtext(name, &buf, dns_rootname, 0, NULL);
	return (result);
}

static isc_result_t
check_hints(dns_db_t *db) {
	isc_result_t result;
	dns_rdataset_t rootns;
	dns_dbiterator_t *dbiter = NULL;
	dns_dbnode_t *node = NULL;
	isc_stdtime_t now;
	dns_fixedname_t fixname;
	dns_name_t *name;
	dns_rdatasetiter_t *rdsiter = NULL;

	isc_stdtime_get(&now);

	dns_fixedname_init(&fixname);
	name = dns_fixedname_name(&fixname);

	dns_rdataset_init(&rootns);
	(void)dns_db_find(db, dns_rootname, NULL, dns_rdatatype_ns, 0,
			  now, NULL, name, &rootns, NULL);
	result = dns_db_createiterator(db, 0, &dbiter);
	if (result != ISC_R_SUCCESS)
		goto cleanup;
	result = dns_dbiterator_first(dbiter);
	while (result == ISC_R_SUCCESS) {
		result = dns_dbiterator_current(dbiter, &node, name);
		if (result != ISC_R_SUCCESS)
			goto cleanup;
		result = dns_db_allrdatasets(db, node, NULL, now, &rdsiter);
		if (result != ISC_R_SUCCESS)
			goto cleanup;
		result = check_node(&rootns, name, rdsiter);
		if (result != ISC_R_SUCCESS)
			goto cleanup;
		dns_rdatasetiter_destroy(&rdsiter);
		dns_db_detachnode(db, &node);
		result = dns_dbiterator_next(dbiter);
	}
	if (result == ISC_R_NOMORE)
		result = ISC_R_SUCCESS;

 cleanup:
	if (dns_rdataset_isassociated(&rootns))
		dns_rdataset_disassociate(&rootns);
	if (rdsiter != NULL)
		dns_rdatasetiter_destroy(&rdsiter);
	if (node != NULL)
		dns_db_detachnode(db, &node);
	if (dbiter != NULL)
		dns_dbiterator_destroy(&dbiter);
	return (result);
}

/*
 * Walk the tree and ensure that all the test nodes are present.
 */
static void
check_test_data(dns_rbt_t *rbt) {
	char buffer[1024];
	char *arg;
	dns_fixedname_t fname;
	dns_fixedname_t fixed;
	dns_name_t *name;
	isc_buffer_t b;
	data_holder_t *data;
	isc_result_t result;
	dns_name_t *foundname;
	rbt_testdata_t *testdatap = testdata;

	dns_fixedname_init(&fixed);
	foundname = dns_fixedname_name(&fixed);

	while (testdatap->name != NULL && testdatap->data.data != NULL) {
		memmove(buffer, testdatap->name, testdatap->name_len + 1);
		arg = buffer;

		isc_buffer_init(&b, arg, testdatap->name_len);
		isc_buffer_add(&b, testdatap->name_len);
		dns_fixedname_init(&fname);
		name = dns_fixedname_name(&fname);
		result = dns_name_fromtext(name, &b, dns_rootname, 0, NULL);
		if (result != ISC_R_SUCCESS) {
			testdatap++;
			continue;
		}

		data = NULL;
		result = dns_rbt_findname(rbt, name, 0, foundname,
					  (void *) &data);
		ATF_CHECK_STREQ(dns_result_totext(result), "success");

		testdatap++;
	}
}

static isc_result_t
dispatch_query(struct query_trans *trans) {
	isc_result_t result;
	size_t namelen;
	isc_buffer_t b;
	char buf[4096];	/* XXX ad hoc constant, but should be enough */
	char *cp;

	REQUIRE(trans != NULL);
	REQUIRE(trans->inuse == ISC_FALSE);
	REQUIRE(ISC_LIST_EMPTY(trans->answerlist));
	REQUIRE(outstanding_queries < MAX_QUERIES);

	/* Construct qname */
	cp = fgets(buf, sizeof(buf), fp);
	if (cp == NULL)
		return (ISC_R_NOMORE);
	/* zap NL if any */
	if ((cp = strchr(buf, '\n')) != NULL)
		*cp = '\0';
	namelen = strlen(buf);
	isc_buffer_init(&b, buf, namelen);
	isc_buffer_add(&b, namelen);
	dns_fixedname_init(&trans->fixedname);
	trans->qname = dns_fixedname_name(&trans->fixedname);
	result = dns_name_fromtext(trans->qname, &b, dns_rootname, 0, NULL);
	if (result != ISC_R_SUCCESS)
		goto cleanup;

	/* Start resolution */
	result = dns_client_startresolve(client, trans->qname,
					 dns_rdataclass_in, trans->type, 0,
					 query_task, process_answer, trans,
					 &trans->xid);
	if (result != ISC_R_SUCCESS)
		goto cleanup;

	trans->inuse = ISC_TRUE;
	outstanding_queries++;

	return (ISC_R_SUCCESS);

 cleanup:
	dns_fixedname_invalidate(&trans->fixedname);

	return (result);
}