txt_16.c

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/*
 * Copyright (C) 2004, 2007-2009, 2012, 2014  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1998-2002  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: txt_16.c,v 1.47 2009/12/04 22:06:37 tbox Exp $ */

/* Reviewed: Thu Mar 16 15:40:00 PST 2000 by bwelling */

#ifndef RDATA_GENERIC_TXT_16_C
#define RDATA_GENERIC_TXT_16_C

#define RRTYPE_TXT_ATTRIBUTES (0)

static inline isc_result_t
fromtext_txt(ARGS_FROMTEXT) {
        isc_token_t token;
        int strings;

        REQUIRE(type == 16);

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

        strings = 0;
        if ((options & DNS_RDATA_UNKNOWNESCAPE) != 0) {
                isc_textregion_t r;
                DE_CONST("#", r.base);
                r.length = 1;
                RETERR(txt_fromtext(&r, target));
                strings++;
        }
        for (;;) {
                RETERR(isc_lex_getmastertoken(lexer, &token,
                                              isc_tokentype_qstring,
                                              ISC_TRUE));
                if (token.type != isc_tokentype_qstring &&
                    token.type != isc_tokentype_string)
                        break;
                RETTOK(txt_fromtext(&token.value.as_textregion, target));
                strings++;
        }
        /* Let upper layer handle eol/eof. */
        isc_lex_ungettoken(lexer, &token);
        return (strings == 0 ? ISC_R_UNEXPECTEDEND : ISC_R_SUCCESS);
}

static inline isc_result_t
totext_txt(ARGS_TOTEXT) {
        isc_region_t region;

        UNUSED(tctx);

        REQUIRE(rdata->type == 16);

        dns_rdata_toregion(rdata, &region);

        while (region.length > 0) {
                RETERR(txt_totext(&region, ISC_TRUE, target));
                if (region.length > 0)
                        RETERR(str_totext(" ", target));
        }

        return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_txt(ARGS_FROMWIRE) {
        isc_result_t result;

        REQUIRE(type == 16);

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

        do {
                result = txt_fromwire(source, target);
                if (result != ISC_R_SUCCESS)
                        return (result);
        } while (!buffer_empty(source));
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_txt(ARGS_TOWIRE) {
        isc_region_t region;

        REQUIRE(rdata->type == 16);

        UNUSED(cctx);

        isc_buffer_availableregion(target, &region);
        if (region.length < rdata->length)
                return (ISC_R_NOSPACE);

        memmove(region.base, rdata->data, rdata->length);
        isc_buffer_add(target, rdata->length);
        return (ISC_R_SUCCESS);
}

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

        REQUIRE(rdata1->type == rdata2->type);
        REQUIRE(rdata1->rdclass == rdata2->rdclass);
        REQUIRE(rdata1->type == 16);

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

static inline isc_result_t
fromstruct_txt(ARGS_FROMSTRUCT) {
        dns_rdata_txt_t *txt = source;
        isc_region_t region;
        isc_uint8_t length;

        REQUIRE(type == 16);
        REQUIRE(source != NULL);
        REQUIRE(txt->common.rdtype == type);
        REQUIRE(txt->common.rdclass == rdclass);
        REQUIRE(txt->txt != NULL && txt->txt_len != 0);

        UNUSED(type);
        UNUSED(rdclass);

        region.base = txt->txt;
        region.length = txt->txt_len;
        while (region.length > 0) {
                length = uint8_fromregion(&region);
                isc_region_consume(&region, 1);
                if (region.length < length)
                        return (ISC_R_UNEXPECTEDEND);
                isc_region_consume(&region, length);
        }

        return (mem_tobuffer(target, txt->txt, txt->txt_len));
}

static inline isc_result_t
tostruct_txt(ARGS_TOSTRUCT) {
        dns_rdata_txt_t *txt = target;
        isc_region_t r;

        REQUIRE(rdata->type == 16);
        REQUIRE(target != NULL);

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

        dns_rdata_toregion(rdata, &r);
        txt->txt_len = r.length;
        txt->txt = mem_maybedup(mctx, r.base, r.length);
        if (txt->txt == NULL)
                return (ISC_R_NOMEMORY);

        txt->offset = 0;
        txt->mctx = mctx;
        return (ISC_R_SUCCESS);
}

static inline void
freestruct_txt(ARGS_FREESTRUCT) {
        dns_rdata_txt_t *txt = source;

        REQUIRE(source != NULL);
        REQUIRE(txt->common.rdtype == 16);

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

        if (txt->txt != NULL)
                isc_mem_free(txt->mctx, txt->txt);
        txt->mctx = NULL;
}

static inline isc_result_t
additionaldata_txt(ARGS_ADDLDATA) {
        REQUIRE(rdata->type == 16);

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

        return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_txt(ARGS_DIGEST) {
        isc_region_t r;

        REQUIRE(rdata->type == 16);

        dns_rdata_toregion(rdata, &r);

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

static inline isc_boolean_t
checkowner_txt(ARGS_CHECKOWNER) {

        REQUIRE(type == 16);

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

        return (ISC_TRUE);
}

static inline isc_boolean_t
checknames_txt(ARGS_CHECKNAMES) {

        REQUIRE(rdata->type == 16);

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

        return (ISC_TRUE);
}

static inline isc_result_t
casecompare_txt(ARGS_COMPARE) {
        return (compare_txt(rdata1, rdata2));
}

isc_result_t
dns_rdata_txt_first(dns_rdata_txt_t *txt) {

        REQUIRE(txt != NULL);
        REQUIRE(txt->common.rdtype == 16);
        REQUIRE(txt->txt != NULL || txt->txt_len == 0);

        if (txt->txt_len == 0)
                return (ISC_R_NOMORE);

        txt->offset = 0;
        return (ISC_R_SUCCESS);
}

isc_result_t
dns_rdata_txt_next(dns_rdata_txt_t *txt) {
        isc_region_t r;
        isc_uint8_t length;

        REQUIRE(txt != NULL);
        REQUIRE(txt->common.rdtype == 16);
        REQUIRE(txt->txt != NULL && txt->txt_len != 0);

        INSIST(txt->offset + 1 <= txt->txt_len);
        r.base = txt->txt + txt->offset;
        r.length = txt->txt_len - txt->offset;
        length = uint8_fromregion(&r);
        INSIST(txt->offset + 1 + length <= txt->txt_len);
        txt->offset = txt->offset + 1 + length;
        if (txt->offset == txt->txt_len)
                return (ISC_R_NOMORE);
        return (ISC_R_SUCCESS);
}

isc_result_t
dns_rdata_txt_current(dns_rdata_txt_t *txt, dns_rdata_txt_string_t *string) {
        isc_region_t r;

        REQUIRE(txt != NULL);
        REQUIRE(string != NULL);
        REQUIRE(txt->common.rdtype == 16);
        REQUIRE(txt->txt != NULL);
        REQUIRE(txt->offset < txt->txt_len);

        INSIST(txt->offset + 1 <= txt->txt_len);
        r.base = txt->txt + txt->offset;
        r.length = txt->txt_len - txt->offset;

        string->length = uint8_fromregion(&r);
        isc_region_consume(&r, 1);
        string->data = r.base;
        INSIST(txt->offset + 1 + string->length <= txt->txt_len);

        return (ISC_R_SUCCESS);
}
#endif  /* RDATA_GENERIC_TXT_16_C */

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