rdata/generic/nsec_47.c

/*
 * Copyright (C) 2003, 2004, 2007-2009, 2011, 2015, 2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

/* $Id: nsec_47.c,v 1.15 2011/01/13 04:59:26 tbox Exp $ */

/* reviewed: Wed Mar 15 18:21:15 PST 2000 by brister */

/* RFC 3845 */

#ifndef RDATA_GENERIC_NSEC_47_C
#define RDATA_GENERIC_NSEC_47_C

/*
 * The attributes do not include DNS_RDATATYPEATTR_SINGLETON
 * because we must be able to handle a parent/child NSEC pair.
 */
#define RRTYPE_NSEC_ATTRIBUTES (DNS_RDATATYPEATTR_DNSSEC)

static inline isc_result_t
fromtext_nsec(ARGS_FROMTEXT) {
    isc_token_t token;
    dns_name_t name;
    isc_buffer_t buffer;

    REQUIRE(type == dns_rdatatype_nsec);

    UNUSED(type);
    UNUSED(rdclass);
    UNUSED(callbacks);

    /*
     * Next domain.
     */
    RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                      ISC_FALSE));
    dns_name_init(&name, NULL);
    buffer_fromregion(&buffer, &token.value.as_region);
    if (origin == NULL)
        origin = dns_rootname;
    RETTOK(dns_name_fromtext(&name, &buffer, origin, options, target));

    return (typemap_fromtext(lexer, target, ISC_FALSE));
}

static inline isc_result_t
totext_nsec(ARGS_TOTEXT) {
    isc_region_t sr;
    dns_name_t name;

    REQUIRE(rdata->type == dns_rdatatype_nsec);
    REQUIRE(rdata->length != 0);

    UNUSED(tctx);

    dns_name_init(&name, NULL);
    dns_rdata_toregion(rdata, &sr);
    dns_name_fromregion(&name, &sr);
    isc_region_consume(&sr, name_length(&name));
    RETERR(dns_name_totext(&name, ISC_FALSE, target));
    return (typemap_totext(&sr, NULL, target));
}

static /* inline */ isc_result_t
fromwire_nsec(ARGS_FROMWIRE) {
    isc_region_t sr;
    dns_name_t name;

    REQUIRE(type == dns_rdatatype_nsec);

    UNUSED(type);
    UNUSED(rdclass);

    dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);

    dns_name_init(&name, NULL);
    RETERR(dns_name_fromwire(&name, source, dctx, options, target));

    isc_buffer_activeregion(source, &sr);
    RETERR(typemap_test(&sr, ISC_FALSE));
    RETERR(mem_tobuffer(target, sr.base, sr.length));
    isc_buffer_forward(source, sr.length);
    return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_nsec(ARGS_TOWIRE) {
    isc_region_t sr;
    dns_name_t name;
    dns_offsets_t offsets;

    REQUIRE(rdata->type == dns_rdatatype_nsec);
    REQUIRE(rdata->length != 0);

    dns_compress_setmethods(cctx, DNS_COMPRESS_NONE);
    dns_name_init(&name, offsets);
    dns_rdata_toregion(rdata, &sr);
    dns_name_fromregion(&name, &sr);
    isc_region_consume(&sr, name_length(&name));
    RETERR(dns_name_towire(&name, cctx, target));

    return (mem_tobuffer(target, sr.base, sr.length));
}

static inline int
compare_nsec(ARGS_COMPARE) {
    isc_region_t r1;
    isc_region_t r2;

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == dns_rdatatype_nsec);
    REQUIRE(rdata1->length != 0);
    REQUIRE(rdata2->length != 0);

    dns_rdata_toregion(rdata1, &r1);
    dns_rdata_toregion(rdata2, &r2);
    return (isc_region_compare(&r1, &r2));
}

static inline isc_result_t
fromstruct_nsec(ARGS_FROMSTRUCT) {
    dns_rdata_nsec_t *nsec = source;
    isc_region_t region;

    REQUIRE(type == dns_rdatatype_nsec);
    REQUIRE(source != NULL);
    REQUIRE(nsec->common.rdtype == type);
    REQUIRE(nsec->common.rdclass == rdclass);
    REQUIRE(nsec->typebits != NULL || nsec->len == 0);

    UNUSED(type);
    UNUSED(rdclass);

    dns_name_toregion(&nsec->next, &region);
    RETERR(isc_buffer_copyregion(target, &region));

    region.base = nsec->typebits;
    region.length = nsec->len;
    RETERR(typemap_test(&region, ISC_FALSE));
    return (mem_tobuffer(target, nsec->typebits, nsec->len));
}

static inline isc_result_t
tostruct_nsec(ARGS_TOSTRUCT) {
    isc_region_t region;
    dns_rdata_nsec_t *nsec = target;
    dns_name_t name;

    REQUIRE(rdata->type == dns_rdatatype_nsec);
    REQUIRE(target != NULL);
    REQUIRE(rdata->length != 0);

    nsec->common.rdclass = rdata->rdclass;
    nsec->common.rdtype = rdata->type;
    ISC_LINK_INIT(&nsec->common, link);

    dns_name_init(&name, NULL);
    dns_rdata_toregion(rdata, &region);
    dns_name_fromregion(&name, &region);
    isc_region_consume(&region, name_length(&name));
    dns_name_init(&nsec->next, NULL);
    RETERR(name_duporclone(&name, mctx, &nsec->next));

    nsec->len = region.length;
    nsec->typebits = mem_maybedup(mctx, region.base, region.length);
    if (nsec->typebits == NULL)
        goto cleanup;

    nsec->mctx = mctx;
    return (ISC_R_SUCCESS);

 cleanup:
    if (mctx != NULL)
        dns_name_free(&nsec->next, mctx);
    return (ISC_R_NOMEMORY);
}

static inline void
freestruct_nsec(ARGS_FREESTRUCT) {
    dns_rdata_nsec_t *nsec = source;

    REQUIRE(source != NULL);
    REQUIRE(nsec->common.rdtype == dns_rdatatype_nsec);

    if (nsec->mctx == NULL)
        return;

    dns_name_free(&nsec->next, nsec->mctx);
    if (nsec->typebits != NULL)
        isc_mem_free(nsec->mctx, nsec->typebits);
    nsec->mctx = NULL;
}

static inline isc_result_t
additionaldata_nsec(ARGS_ADDLDATA) {
    REQUIRE(rdata->type == dns_rdatatype_nsec);

    UNUSED(rdata);
    UNUSED(add);
    UNUSED(arg);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_nsec(ARGS_DIGEST) {
    isc_region_t r;

    REQUIRE(rdata->type == dns_rdatatype_nsec);

    dns_rdata_toregion(rdata, &r);
    return ((digest)(arg, &r));
}

static inline isc_boolean_t
checkowner_nsec(ARGS_CHECKOWNER) {

       REQUIRE(type == dns_rdatatype_nsec);

       UNUSED(name);
       UNUSED(type);
       UNUSED(rdclass);
       UNUSED(wildcard);

       return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_nsec(ARGS_CHECKNAMES) {

    REQUIRE(rdata->type == dns_rdatatype_nsec);

    UNUSED(rdata);
    UNUSED(owner);
    UNUSED(bad);

    return (ISC_TRUE);
}

static inline int
casecompare_nsec(ARGS_COMPARE) {
    isc_region_t region1;
    isc_region_t region2;
    dns_name_t name1;
    dns_name_t name2;
    int order;

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == dns_rdatatype_nsec);
    REQUIRE(rdata1->length != 0);
    REQUIRE(rdata2->length != 0);

    dns_name_init(&name1, NULL);
    dns_name_init(&name2, NULL);

    dns_rdata_toregion(rdata1, &region1);
    dns_rdata_toregion(rdata2, &region2);

    dns_name_fromregion(&name1, &region1);
    dns_name_fromregion(&name2, &region2);

    order = dns_name_rdatacompare(&name1, &name2);
    if (order != 0)
        return (order);

    isc_region_consume(&region1, name_length(&name1));
    isc_region_consume(&region2, name_length(&name2));

    return (isc_region_compare(&region1, &region2));
}
#endif  /* RDATA_GENERIC_NSEC_47_C */