lib/dns/rdatalist.c

	rdatalist.c revision 69fe9aaafdd6a141610e86a777d325db75422070
/*
 * Copyright (C) 2004, 2005  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2001, 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 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: rdatalist.c,v 1.31 2005/04/29 00:22:50 marka Exp $ */

/*! \file */

#include <config.h>

#include <stddef.h>

#include <isc/util.h>

#include <dns/name.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,
    NULL,
    NULL,
    NULL
};

void
dns_rdatalist_init(dns_rdatalist_t *rdatalist) {

    /*
     * Initialize rdatalist.
     */

    rdatalist->rdclass = 0;
    rdatalist->type = 0;
    rdatalist->covers = 0;
    rdatalist->ttl = 0;
    ISC_LIST_INIT(rdatalist->rdata);
    ISC_LINK_INIT(rdatalist, link);
}

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));

    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);
}

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;

    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;

    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) {
    *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;

    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 *nsec = NULL;
    dns_rdataset_t *nsecsig = NULL;
    dns_rdataset_t *rdset;
    dns_ttl_t ttl;

    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)
            nsec = rdset;
        if (rdset->type == dns_rdatatype_rrsig &&
            rdset->covers == dns_rdatatype_nsec)
            nsecsig = rdset;
    }

    if (nsec == NULL || nsecsig == NULL)
        return (ISC_R_NOTFOUND);
    /*
     * Minimise ttl.
     */
    ttl = rdataset->ttl;
    if (nsec->ttl < ttl)
        ttl = nsec->ttl;
    if (nsecsig->ttl < ttl)
        ttl = nsecsig->ttl;
    rdataset->ttl = nsec->ttl = nsecsig->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 *nsec, dns_rdataset_t *nsecsig)
{
    dns_rdataclass_t rdclass = rdataset->rdclass;
    dns_rdataset_t *tnsec = NULL;
    dns_rdataset_t *tnsecsig = NULL;
    dns_name_t *noqname = rdataset->private6;

    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)
            tnsec = rdataset;
        if (rdataset->type == dns_rdatatype_rrsig &&
            rdataset->covers == dns_rdatatype_nsec)
            tnsecsig = rdataset;
    }
    if (tnsec == NULL || tnsecsig == NULL)
        return (ISC_R_NOTFOUND);

    dns_name_clone(noqname, name);
    dns_rdataset_clone(tnsec, nsec);
    dns_rdataset_clone(tnsecsig, nsecsig);
    return (ISC_R_SUCCESS);
}