caa_257.c

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/*
 * Copyright (C) 2014, 2015  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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.
 */

#ifndef GENERIC_CAA_257_C
#define GENERIC_CAA_257_C 1

#define RRTYPE_CAA_ATTRIBUTES (0)

static unsigned char const alphanumeric[256] = {
        /* 0x00-0x0f */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0x10-0x1f */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0x20-0x2f */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0x30-0x3f */ 1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 0, 0, 0, 0, 0, 0,
        /* 0x40-0x4f */ 0, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
        /* 0x50-0x5f */ 1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 0, 0, 0, 0, 0,
        /* 0x60-0x6f */ 0, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 1, 1, 1, 1, 1,
        /* 0x70-0x7f */ 1, 1, 1, 1, 1, 1, 1, 1,  1, 1, 1, 0, 0, 0, 0, 0,
        /* 0x80-0x8f */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0x90-0x9f */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0xa0-0xaf */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0xb0-0xbf */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0xc0-0xcf */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0xd0-0xdf */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0xe0-0xef */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
        /* 0xf0-0xff */ 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0,
};

static inline isc_result_t
fromtext_caa(ARGS_FROMTEXT) {
        isc_token_t token;
        isc_textregion_t tr;
        isc_uint8_t flags;
        unsigned int i;

        REQUIRE(type == 257);

        UNUSED(type);
        UNUSED(rdclass);
        UNUSED(origin);
        UNUSED(options);
        UNUSED(callbacks);

        /* Flags. */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
                                      ISC_FALSE));
        if (token.value.as_ulong > 255U)
                RETTOK(ISC_R_RANGE);
        flags = token.value.as_ulong & 255U;
        RETERR(uint8_tobuffer(flags, target));

        /*
         * Tag
         */
        RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_string,
                                      ISC_FALSE));
        tr = token.value.as_textregion;
        for (i = 0; i < tr.length; i++)
                if (!alphanumeric[(unsigned char) tr.base[i]])
                        RETTOK(DNS_R_SYNTAX);
        RETERR(uint8_tobuffer(tr.length, target));
        RETERR(mem_tobuffer(target, tr.base, tr.length));

        /*
         * Value
         */
        RETERR(isc_lex_getmastertoken(lexer, &token,
                                      isc_tokentype_qstring, ISC_FALSE));
        if (token.type != isc_tokentype_qstring &&
            token.type != isc_tokentype_string)
                RETERR(DNS_R_SYNTAX);
        RETERR(multitxt_fromtext(&token.value.as_textregion, target));
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
totext_caa(ARGS_TOTEXT) {
        isc_region_t region;
        isc_uint8_t flags;
        char buf[256];

        UNUSED(tctx);

        REQUIRE(rdata->type == 257);
        REQUIRE(rdata->length >= 3U);
        REQUIRE(rdata->data != NULL);

        dns_rdata_toregion(rdata, &region);

        /*
         * Flags
         */
        flags = uint8_consume_fromregion(&region);
        sprintf(buf, "%u ", flags);
        RETERR(str_totext(buf, target));

        /*
         * Tag
         */
        RETERR(txt_totext(&region, ISC_FALSE, target));
        RETERR(str_totext(" ", target));

        /*
         * Value
         */
        RETERR(multitxt_totext(&region, target));
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_caa(ARGS_FROMWIRE) {
        isc_region_t sr;
        unsigned int len, i;

        REQUIRE(type == 257);

        UNUSED(type);
        UNUSED(rdclass);
        UNUSED(dctx);
        UNUSED(options);

        /*
         * Flags
         */
        isc_buffer_activeregion(source, &sr);
        if (sr.length < 2)
                return (ISC_R_UNEXPECTEDEND);

        /*
         * Flags, tag length
         */
        RETERR(mem_tobuffer(target, sr.base, 2));
        len = sr.base[1];
        isc_region_consume(&sr, 2);
        isc_buffer_forward(source, 2);

        /*
         * Zero length tag fields are illegal.
         */
        if (sr.length < len || len == 0)
                RETERR(DNS_R_FORMERR);

        /* Check the Tag's value */
        for (i = 0; i < len; i++)
                if (!alphanumeric[sr.base[i]])
                        RETERR(DNS_R_FORMERR);
        /*
         * Tag + Value
         */
        isc_buffer_forward(source, sr.length);
        return (mem_tobuffer(target, sr.base, sr.length));
}

static inline isc_result_t
towire_caa(ARGS_TOWIRE) {
        isc_region_t region;

        REQUIRE(rdata->type == 257);
        REQUIRE(rdata->length >= 3U);
        REQUIRE(rdata->data != NULL);

        UNUSED(cctx);

        dns_rdata_toregion(rdata, &region);
        return (mem_tobuffer(target, region.base, region.length));
}

static inline int
compare_caa(ARGS_COMPARE) {
        isc_region_t r1, r2;

        REQUIRE(rdata1->type == rdata2->type);
        REQUIRE(rdata1->rdclass == rdata2->rdclass);
        REQUIRE(rdata1->type == 257);
        REQUIRE(rdata1->length >= 3U);
        REQUIRE(rdata2->length >= 3U);
        REQUIRE(rdata1->data != NULL);
        REQUIRE(rdata2->data != NULL);

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

static inline isc_result_t
fromstruct_caa(ARGS_FROMSTRUCT) {
        dns_rdata_caa_t *caa = source;
        isc_region_t region;
        unsigned int i;

        REQUIRE(type == 257);
        REQUIRE(source != NULL);
        REQUIRE(caa->common.rdtype == type);
        REQUIRE(caa->common.rdclass == rdclass);
        REQUIRE(caa->tag != NULL && caa->tag_len != 0);
        REQUIRE(caa->value != NULL);

        UNUSED(type);
        UNUSED(rdclass);

        /*
         * Flags
         */
        RETERR(uint8_tobuffer(caa->flags, target));

        /*
         * Tag length
         */
        RETERR(uint8_tobuffer(caa->tag_len, target));

        /*
         * Tag
         */
        region.base = caa->tag;
        region.length = caa->tag_len;
        for (i = 0; i < region.length; i++)
                if (!alphanumeric[region.base[i]])
                        RETERR(DNS_R_SYNTAX);
        RETERR(isc_buffer_copyregion(target, &region));

        /*
         * Value
         */
        region.base = caa->value;
        region.length = caa->value_len;
        return (isc_buffer_copyregion(target, &region));
}

static inline isc_result_t
tostruct_caa(ARGS_TOSTRUCT) {
        dns_rdata_caa_t *caa = target;
        isc_region_t sr;

        REQUIRE(rdata->type == 257);
        REQUIRE(target != NULL);
        REQUIRE(rdata->length >= 3U);
        REQUIRE(rdata->data != NULL);

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

        dns_rdata_toregion(rdata, &sr);

        /*
         * Flags
         */
        if (sr.length < 1)
                return (ISC_R_UNEXPECTEDEND);
        caa->flags = uint8_fromregion(&sr);
        isc_region_consume(&sr, 1);

        /*
         * Tag length
         */
        if (sr.length < 1)
                return (ISC_R_UNEXPECTEDEND);
        caa->tag_len = uint8_fromregion(&sr);
        isc_region_consume(&sr, 1);

        /*
         * Tag
         */
        if (sr.length < caa->tag_len)
                return (ISC_R_UNEXPECTEDEND);
        caa->tag = mem_maybedup(mctx, sr.base, caa->tag_len);
        if (caa->tag == NULL)
                return (ISC_R_NOMEMORY);
        isc_region_consume(&sr, caa->tag_len);

        /*
         * Value
         */
        caa->value_len = sr.length;
        caa->value = mem_maybedup(mctx, sr.base, sr.length);
        if (caa->value == NULL)
                return (ISC_R_NOMEMORY);

        caa->mctx = mctx;
        return (ISC_R_SUCCESS);
}

static inline void
freestruct_caa(ARGS_FREESTRUCT) {
        dns_rdata_caa_t *caa = (dns_rdata_caa_t *) source;

        REQUIRE(source != NULL);
        REQUIRE(caa->common.rdtype == 257);

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

        if (caa->tag != NULL)
                isc_mem_free(caa->mctx, caa->tag);
        if (caa->value != NULL)
                isc_mem_free(caa->mctx, caa->value);
        caa->mctx = NULL;
}

static inline isc_result_t
additionaldata_caa(ARGS_ADDLDATA) {
        REQUIRE(rdata->type == 257);
        REQUIRE(rdata->data != NULL);
        REQUIRE(rdata->length >= 3U);

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

        return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_caa(ARGS_DIGEST) {
        isc_region_t r;

        REQUIRE(rdata->type == 257);
        REQUIRE(rdata->data != NULL);
        REQUIRE(rdata->length >= 3U);

        dns_rdata_toregion(rdata, &r);

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

static inline isc_boolean_t
checkowner_caa(ARGS_CHECKOWNER) {

        REQUIRE(type == 257);

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

        return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_caa(ARGS_CHECKNAMES) {

        REQUIRE(rdata->type == 257);
        REQUIRE(rdata->data != NULL);
        REQUIRE(rdata->length >= 3U);

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

        return (ISC_TRUE);
}

static inline int
casecompare_caa(ARGS_COMPARE) {
        return (compare_caa(rdata1, rdata2));
}

#endif /* GENERIC_CAA_257_C */

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