rdata/generic/nxt_30.c

/*
 * Copyright (C) 1999-2005, 2007, 2009, 2015-2017  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: nxt_30.c,v 1.65 2009/12/04 22:06:37 tbox Exp $ */

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

/* RFC2535 */

#ifndef RDATA_GENERIC_NXT_30_C
#define RDATA_GENERIC_NXT_30_C

/*
 * The attributes do not include DNS_RDATATYPEATTR_SINGLETON
 * because we must be able to handle a parent/child NXT pair.
 */
#define RRTYPE_NXT_ATTRIBUTES (0)

static inline isc_result_t
fromtext_nxt(ARGS_FROMTEXT) {
    isc_token_t token;
    dns_name_t name;
    isc_buffer_t buffer;
    char *e;
    unsigned char bm[8*1024]; /* 64k bits */
    dns_rdatatype_t covered;
    dns_rdatatype_t maxcovered = 0;
    isc_boolean_t first = ISC_TRUE;
    long n;

    REQUIRE(type == dns_rdatatype_nxt);

    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));

    memset(bm, 0, sizeof(bm));
    do {
        RETERR(isc_lex_getmastertoken(lexer, &token,
                          isc_tokentype_string, ISC_TRUE));
        if (token.type != isc_tokentype_string)
            break;
        n = strtol(DNS_AS_STR(token), &e, 10);
        if (e != DNS_AS_STR(token) && *e == '\0') {
            covered = (dns_rdatatype_t)n;
        } else if (dns_rdatatype_fromtext(&covered,
                &token.value.as_textregion) == DNS_R_UNKNOWN)
            RETTOK(DNS_R_UNKNOWN);
        /*
         * NXT is only specified for types 1..127.
         */
        if (covered < 1 || covered > 127)
            return (ISC_R_RANGE);
        if (first || covered > maxcovered)
            maxcovered = covered;
        first = ISC_FALSE;
        bm[covered/8] |= (0x80>>(covered%8));
    } while (1);
    isc_lex_ungettoken(lexer, &token);
    if (first)
        return (ISC_R_SUCCESS);
    n = (maxcovered + 8) / 8;
    return (mem_tobuffer(target, bm, n));
}

static inline isc_result_t
totext_nxt(ARGS_TOTEXT) {
    isc_region_t sr;
    unsigned int i, j;
    dns_name_t name;
    dns_name_t prefix;
    isc_boolean_t sub;

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

    dns_name_init(&name, NULL);
    dns_name_init(&prefix, NULL);
    dns_rdata_toregion(rdata, &sr);
    dns_name_fromregion(&name, &sr);
    isc_region_consume(&sr, name_length(&name));
    sub = name_prefix(&name, tctx->origin, &prefix);
    RETERR(dns_name_totext(&prefix, sub, target));

    for (i = 0; i < sr.length; i++) {
        if (sr.base[i] != 0)
            for (j = 0; j < 8; j++)
                if ((sr.base[i] & (0x80 >> j)) != 0) {
                    dns_rdatatype_t t = i * 8 + j;
                    RETERR(str_totext(" ", target));
                    if (dns_rdatatype_isknown(t)) {
                        RETERR(dns_rdatatype_totext(t,
                                      target));
                    } else {
                        char buf[sizeof("65535")];
                        snprintf(buf, sizeof(buf),
                             "%u", t);
                        RETERR(str_totext(buf,
                                  target));
                    }
                }
    }
    return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_nxt(ARGS_FROMWIRE) {
    isc_region_t sr;
    dns_name_t name;

    REQUIRE(type == dns_rdatatype_nxt);

    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);
    if (sr.length > 0 && (sr.base[0] & 0x80) == 0 &&
        ((sr.length > 16) || sr.base[sr.length - 1] == 0))
        return (DNS_R_BADBITMAP);
    RETERR(mem_tobuffer(target, sr.base, sr.length));
    isc_buffer_forward(source, sr.length);
    return (ISC_R_SUCCESS);
}

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

    REQUIRE(rdata->type == dns_rdatatype_nxt);
    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_nxt(ARGS_COMPARE) {
    isc_region_t r1;
    isc_region_t r2;
    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_nxt);
    REQUIRE(rdata1->length != 0);
    REQUIRE(rdata2->length != 0);

    dns_name_init(&name1, NULL);
    dns_name_init(&name2, NULL);
    dns_rdata_toregion(rdata1, &r1);
    dns_rdata_toregion(rdata2, &r2);
    dns_name_fromregion(&name1, &r1);
    dns_name_fromregion(&name2, &r2);
    order = dns_name_rdatacompare(&name1, &name2);
    if (order != 0)
        return (order);

    return (isc_region_compare(&r1, &r2));
}

static inline isc_result_t
fromstruct_nxt(ARGS_FROMSTRUCT) {
    dns_rdata_nxt_t *nxt = source;
    isc_region_t region;

    REQUIRE(type == dns_rdatatype_nxt);
    REQUIRE(source != NULL);
    REQUIRE(nxt->common.rdtype == type);
    REQUIRE(nxt->common.rdclass == rdclass);
    REQUIRE(nxt->typebits != NULL || nxt->len == 0);
    if (nxt->typebits != NULL && (nxt->typebits[0] & 0x80) == 0) {
        REQUIRE(nxt->len <= 16);
        REQUIRE(nxt->typebits[nxt->len - 1] != 0);
    }

    UNUSED(type);
    UNUSED(rdclass);

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

    return (mem_tobuffer(target, nxt->typebits, nxt->len));
}

static inline isc_result_t
tostruct_nxt(ARGS_TOSTRUCT) {
    isc_region_t region;
    dns_rdata_nxt_t *nxt = target;
    dns_name_t name;

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

    nxt->common.rdclass = rdata->rdclass;
    nxt->common.rdtype = rdata->type;
    ISC_LINK_INIT(&nxt->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(&nxt->next, NULL);
    RETERR(name_duporclone(&name, mctx, &nxt->next));

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

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

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

static inline void
freestruct_nxt(ARGS_FREESTRUCT) {
    dns_rdata_nxt_t *nxt = source;

    REQUIRE(source != NULL);
    REQUIRE(nxt->common.rdtype == dns_rdatatype_nxt);

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

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

static inline isc_result_t
additionaldata_nxt(ARGS_ADDLDATA) {
    REQUIRE(rdata->type == dns_rdatatype_nxt);

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

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_nxt(ARGS_DIGEST) {
    isc_region_t r;
    dns_name_t name;
    isc_result_t result;

    REQUIRE(rdata->type == dns_rdatatype_nxt);

    dns_rdata_toregion(rdata, &r);
    dns_name_init(&name, NULL);
    dns_name_fromregion(&name, &r);
    result = dns_name_digest(&name, digest, arg);
    if (result != ISC_R_SUCCESS)
        return (result);
    isc_region_consume(&r, name_length(&name));

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

static inline isc_boolean_t
checkowner_nxt(ARGS_CHECKOWNER) {

    REQUIRE(type == dns_rdatatype_nxt);

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

    return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_nxt(ARGS_CHECKNAMES) {

    REQUIRE(rdata->type == dns_rdatatype_nxt);

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

    return (ISC_TRUE);
}

static inline int
casecompare_nxt(ARGS_COMPARE) {
    return (compare_nxt(rdata1, rdata2));
}
#endif  /* RDATA_GENERIC_NXT_30_C */