rdatalist.c

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/*
 * Copyright (C) 2004, 2005, 2007, 2008, 2010-2012, 2014, 2015  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2001, 2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or 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.
 */

/* $Id$ */

/*! \file */

#include <config.h>

#include <stddef.h>
#include <string.h>

#include <isc/util.h>

#include <dns/name.h>
#include <dns/nsec3.h>
#include <dns/rdata.h>
#include <dns/rdatalist.h>
#include <dns/rdataset.h>

#include "rdatalist_p.h"

static dns_rdatasetmethods_t methods = {
        isc__rdatalist_disassociate,
        isc__rdatalist_first,
        isc__rdatalist_next,
        isc__rdatalist_current,
        isc__rdatalist_clone,
        isc__rdatalist_count,
        isc__rdatalist_addnoqname,
        isc__rdatalist_getnoqname,
        isc__rdatalist_addclosest,
        isc__rdatalist_getclosest,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        NULL,
        isc__rdatalist_setownercase,
        isc__rdatalist_getownercase
};

void
dns_rdatalist_init(dns_rdatalist_t *rdatalist) {

        REQUIRE(rdatalist != NULL);

        /*
         * Initialize rdatalist.
         */

        rdatalist->rdclass = 0;
        rdatalist->type = 0;
        rdatalist->covers = 0;
        rdatalist->ttl = 0;
        ISC_LIST_INIT(rdatalist->rdata);
        ISC_LINK_INIT(rdatalist, link);
        memset(rdatalist->upper, 0xeb, sizeof(rdatalist->upper));
        /*
         * Clear upper set bit.
         */
        rdatalist->upper[0] &= ~0x01;
}

isc_result_t
dns_rdatalist_tordataset(dns_rdatalist_t *rdatalist,
                         dns_rdataset_t *rdataset)
{
        /*
         * Make 'rdataset' refer to the rdata in 'rdatalist'.
         */

        REQUIRE(rdatalist != NULL);
        REQUIRE(DNS_RDATASET_VALID(rdataset));
        REQUIRE(! dns_rdataset_isassociated(rdataset));

        /* Check if dns_rdatalist_init has was called. */
        REQUIRE(rdatalist->upper[0] == 0xea);

        rdataset->methods = &methods;
        rdataset->rdclass = rdatalist->rdclass;
        rdataset->type = rdatalist->type;
        rdataset->covers = rdatalist->covers;
        rdataset->ttl = rdatalist->ttl;
        rdataset->trust = 0;
        rdataset->private1 = rdatalist;
        rdataset->private2 = NULL;
        rdataset->private3 = NULL;
        rdataset->privateuint4 = 0;
        rdataset->private5 = NULL;

        return (ISC_R_SUCCESS);
}

isc_result_t
dns_rdatalist_fromrdataset(dns_rdataset_t *rdataset,
                           dns_rdatalist_t **rdatalist)
{
        REQUIRE(rdatalist != NULL && rdataset != NULL);
        *rdatalist = rdataset->private1;

        return (ISC_R_SUCCESS);
}

void
isc__rdatalist_disassociate(dns_rdataset_t *rdataset) {
        UNUSED(rdataset);
}

isc_result_t
isc__rdatalist_first(dns_rdataset_t *rdataset) {
        dns_rdatalist_t *rdatalist;

        rdatalist = rdataset->private1;
        rdataset->private2 = ISC_LIST_HEAD(rdatalist->rdata);

        if (rdataset->private2 == NULL)
                return (ISC_R_NOMORE);

        return (ISC_R_SUCCESS);
}

isc_result_t
isc__rdatalist_next(dns_rdataset_t *rdataset) {
        dns_rdata_t *rdata;

        REQUIRE(rdataset != NULL);

        rdata = rdataset->private2;
        if (rdata == NULL)
                return (ISC_R_NOMORE);

        rdataset->private2 = ISC_LIST_NEXT(rdata, link);

        if (rdataset->private2 == NULL)
                return (ISC_R_NOMORE);

        return (ISC_R_SUCCESS);
}

void
isc__rdatalist_current(dns_rdataset_t *rdataset, dns_rdata_t *rdata) {
        dns_rdata_t *list_rdata;

        REQUIRE(rdataset != NULL);

        list_rdata = rdataset->private2;
        INSIST(list_rdata != NULL);

        dns_rdata_clone(list_rdata, rdata);
}

void
isc__rdatalist_clone(dns_rdataset_t *source, dns_rdataset_t *target) {

        REQUIRE(source != NULL);
        REQUIRE(target != NULL);

        *target = *source;

        /*
         * Reset iterator state.
         */
        target->private2 = NULL;
}

unsigned int
isc__rdatalist_count(dns_rdataset_t *rdataset) {
        dns_rdatalist_t *rdatalist;
        dns_rdata_t *rdata;
        unsigned int count;

        REQUIRE(rdataset != NULL);

        rdatalist = rdataset->private1;

        count = 0;
        for (rdata = ISC_LIST_HEAD(rdatalist->rdata);
             rdata != NULL;
             rdata = ISC_LIST_NEXT(rdata, link))
                count++;

        return (count);
}

isc_result_t
isc__rdatalist_addnoqname(dns_rdataset_t *rdataset, dns_name_t *name) {
        dns_rdataset_t *neg = NULL;
        dns_rdataset_t *negsig = NULL;
        dns_rdataset_t *rdset;
        dns_ttl_t ttl;

        REQUIRE(rdataset != NULL);

        for (rdset = ISC_LIST_HEAD(name->list);
             rdset != NULL;
             rdset = ISC_LIST_NEXT(rdset, link))
        {
                if (rdset->rdclass != rdataset->rdclass)
                        continue;
                if (rdset->type == dns_rdatatype_nsec ||
                    rdset->type == dns_rdatatype_nsec3)
                        neg = rdset;
        }
        if (neg == NULL)
                return (ISC_R_NOTFOUND);

        for (rdset = ISC_LIST_HEAD(name->list);
             rdset != NULL;
             rdset = ISC_LIST_NEXT(rdset, link))
        {
                if (rdset->type == dns_rdatatype_rrsig &&
                    rdset->covers == neg->type)
                        negsig = rdset;
        }

        if (negsig == NULL)
                return (ISC_R_NOTFOUND);
        /*
         * Minimise ttl.
         */
        ttl = rdataset->ttl;
        if (neg->ttl < ttl)
                ttl = neg->ttl;
        if (negsig->ttl < ttl)
                ttl = negsig->ttl;
        rdataset->ttl = neg->ttl = negsig->ttl = ttl;
        rdataset->attributes |= DNS_RDATASETATTR_NOQNAME;
        rdataset->private6 = name;
        return (ISC_R_SUCCESS);
}

isc_result_t
isc__rdatalist_getnoqname(dns_rdataset_t *rdataset, dns_name_t *name,
                          dns_rdataset_t *neg, dns_rdataset_t *negsig)
{
        dns_rdataclass_t rdclass = rdataset->rdclass;
        dns_rdataset_t *tneg = NULL;
        dns_rdataset_t *tnegsig = NULL;
        dns_name_t *noqname = rdataset->private6;

        REQUIRE(rdataset != NULL);
        REQUIRE((rdataset->attributes & DNS_RDATASETATTR_NOQNAME) != 0);

        (void)dns_name_dynamic(noqname);        /* Sanity Check. */

        for (rdataset = ISC_LIST_HEAD(noqname->list);
             rdataset != NULL;
             rdataset = ISC_LIST_NEXT(rdataset, link))
        {
                if (rdataset->rdclass != rdclass)
                        continue;
                if (rdataset->type == dns_rdatatype_nsec ||
                    rdataset->type == dns_rdatatype_nsec3)
                        tneg = rdataset;
        }
        if (tneg == NULL)
                return (ISC_R_NOTFOUND);

        for (rdataset = ISC_LIST_HEAD(noqname->list);
             rdataset != NULL;
             rdataset = ISC_LIST_NEXT(rdataset, link))
        {
                if (rdataset->type == dns_rdatatype_rrsig &&
                    rdataset->covers == tneg->type)
                        tnegsig = rdataset;
        }
        if (tnegsig == NULL)
                return (ISC_R_NOTFOUND);

        dns_name_clone(noqname, name);
        dns_rdataset_clone(tneg, neg);
        dns_rdataset_clone(tnegsig, negsig);
        return (ISC_R_SUCCESS);
}

isc_result_t
isc__rdatalist_addclosest(dns_rdataset_t *rdataset, dns_name_t *name) {
        dns_rdataset_t *neg = NULL;
        dns_rdataset_t *negsig = NULL;
        dns_rdataset_t *rdset;
        dns_ttl_t ttl;

        REQUIRE(rdataset != NULL);

        for (rdset = ISC_LIST_HEAD(name->list);
             rdset != NULL;
             rdset = ISC_LIST_NEXT(rdset, link))
        {
                if (rdset->rdclass != rdataset->rdclass)
                        continue;
                if (rdset->type == dns_rdatatype_nsec ||
                    rdset->type == dns_rdatatype_nsec3)
                        neg = rdset;
        }
        if (neg == NULL)
                return (ISC_R_NOTFOUND);

        for (rdset = ISC_LIST_HEAD(name->list);
             rdset != NULL;
             rdset = ISC_LIST_NEXT(rdset, link))
        {
                if (rdset->type == dns_rdatatype_rrsig &&
                    rdset->covers == neg->type)
                        negsig = rdset;
        }

        if (negsig == NULL)
                return (ISC_R_NOTFOUND);
        /*
         * Minimise ttl.
         */
        ttl = rdataset->ttl;
        if (neg->ttl < ttl)
                ttl = neg->ttl;
        if (negsig->ttl < ttl)
                ttl = negsig->ttl;
        rdataset->ttl = neg->ttl = negsig->ttl = ttl;
        rdataset->attributes |= DNS_RDATASETATTR_CLOSEST;
        rdataset->private7 = name;
        return (ISC_R_SUCCESS);
}

isc_result_t
isc__rdatalist_getclosest(dns_rdataset_t *rdataset, dns_name_t *name,
                          dns_rdataset_t *neg, dns_rdataset_t *negsig)
{
        dns_rdataclass_t rdclass = rdataset->rdclass;
        dns_rdataset_t *tneg = NULL;
        dns_rdataset_t *tnegsig = NULL;
        dns_name_t *closest = rdataset->private7;

        REQUIRE(rdataset != NULL);
        REQUIRE((rdataset->attributes & DNS_RDATASETATTR_CLOSEST) != 0);

        (void)dns_name_dynamic(closest);        /* Sanity Check. */

        for (rdataset = ISC_LIST_HEAD(closest->list);
             rdataset != NULL;
             rdataset = ISC_LIST_NEXT(rdataset, link))
        {
                if (rdataset->rdclass != rdclass)
                        continue;
                if (rdataset->type == dns_rdatatype_nsec ||
                    rdataset->type == dns_rdatatype_nsec3)
                        tneg = rdataset;
        }
        if (tneg == NULL)
                return (ISC_R_NOTFOUND);

        for (rdataset = ISC_LIST_HEAD(closest->list);
             rdataset != NULL;
             rdataset = ISC_LIST_NEXT(rdataset, link))
        {
                if (rdataset->type == dns_rdatatype_rrsig &&
                    rdataset->covers == tneg->type)
                        tnegsig = rdataset;
        }
        if (tnegsig == NULL)
                return (ISC_R_NOTFOUND);

        dns_name_clone(closest, name);
        dns_rdataset_clone(tneg, neg);
        dns_rdataset_clone(tnegsig, negsig);
        return (ISC_R_SUCCESS);
}

void
isc__rdatalist_setownercase(dns_rdataset_t *rdataset, const dns_name_t *name) {
        dns_rdatalist_t *rdatalist;
        unsigned int i;

        /*
         * We do not need to worry about label lengths as they are all
         * less than or equal to 63.
         */
        rdatalist = rdataset->private1;
        memset(rdatalist->upper, 0, sizeof(rdatalist->upper));
        for (i = 1; i < name->length; i++)
                if (name->ndata[i] >= 0x41 && name->ndata[i] <= 0x5a)
                        rdatalist->upper[i/8] |= 1 << (i%8);
        /*
         * Record that upper has been set.
         */
        rdatalist->upper[0] |= 0x01;
}

void
isc__rdatalist_getownercase(const dns_rdataset_t *rdataset, dns_name_t *name) {
        dns_rdatalist_t *rdatalist;
        unsigned int i;

        rdatalist = rdataset->private1;
        if ((rdatalist->upper[0] & 0x01) == 0)
                return;
        for (i = 0; i < name->length; i++) {
                /*
                 * Set the case bit if it does not match the recorded bit.
                 */
                if (name->ndata[i] >= 0x61 && name->ndata[i] <= 0x7a &&
                    (rdatalist->upper[i/8] & (1 << (i%8))) != 0)
                        name->ndata[i] &= ~0x20; /* clear the lower case bit */
                else if (name->ndata[i] >= 0x41 && name->ndata[i] <= 0x5a &&
                    (rdatalist->upper[i/8] & (1 << (i%8))) == 0)
                        name->ndata[i] |= 0x20; /* set the lower case bit */
        }
}

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