rdata/in_1/a_1.c

	a_1.c revision 90f9d00f087ddb4442d1ebf628c1bcaff18226a0
/*
 * Copyright (C) 1998, 1999, 2000  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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM 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: a_1.c,v 1.29 2000/04/27 23:57:56 gson Exp $ */

/* Reviewed: Thu Mar 16 16:52:50 PST 2000 by bwelling */

#ifndef RDATA_IN_1_A_1_C
#define RDATA_IN_1_A_1_C

#include <string.h>

#include <isc/net.h>

#define RRTYPE_A_ATTRIBUTES (0)

static inline isc_result_t
fromtext_in_a(dns_rdataclass_t rdclass, dns_rdatatype_t type,
          isc_lex_t *lexer, dns_name_t *origin,
          isc_boolean_t downcase, isc_buffer_t *target)
{
    isc_token_t token;
    struct in_addr addr;
    isc_region_t region;

    UNUSED(origin);
    UNUSED(downcase);

    REQUIRE(type == 1);
    REQUIRE(rdclass == 1);

    RETERR(gettoken(lexer, &token, isc_tokentype_string, ISC_FALSE));

    if (inet_aton(token.value.as_pointer, &addr) != 1)
        return (DNS_R_BADDOTTEDQUAD);
    isc_buffer_availableregion(target, &region);
    if (region.length < 4)
        return (ISC_R_NOSPACE);
    memcpy(region.base, &addr, 4);
    isc_buffer_add(target, 4);
    return (ISC_R_SUCCESS);
}

static inline isc_result_t
totext_in_a(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
        isc_buffer_t *target)
{
    isc_region_t region;

    UNUSED(tctx);

    REQUIRE(rdata->type == 1);
    REQUIRE(rdata->rdclass == 1);
    REQUIRE(rdata->length == 4);

    isc_buffer_availableregion(target, &region);
    if (inet_ntop(AF_INET, rdata->data,
              (char *)region.base, region.length) == NULL)
        return (ISC_R_NOSPACE);

    isc_buffer_add(target, strlen((char *)region.base));
    return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_in_a(dns_rdataclass_t rdclass, dns_rdatatype_t type,
          isc_buffer_t *source, dns_decompress_t *dctx,
          isc_boolean_t downcase, isc_buffer_t *target)
{
    isc_region_t sregion;
    isc_region_t tregion;

    UNUSED(dctx);
    UNUSED(downcase);

    REQUIRE(type == 1);
    REQUIRE(rdclass == 1);

    isc_buffer_activeregion(source, &sregion);
    isc_buffer_availableregion(target, &tregion);
    if (sregion.length < 4)
        return (ISC_R_UNEXPECTEDEND);
    if (tregion.length < 4)
        return (ISC_R_NOSPACE);

    memcpy(tregion.base, sregion.base, 4);
    isc_buffer_forward(source, 4);
    isc_buffer_add(target, 4);
    return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_in_a(dns_rdata_t *rdata, dns_compress_t *cctx, isc_buffer_t *target) {
    isc_region_t region;

    UNUSED(cctx);

    REQUIRE(rdata->type == 1);
    REQUIRE(rdata->rdclass == 1);

    isc_buffer_availableregion(target, &region);
    if (region.length < rdata->length)
        return (ISC_R_NOSPACE);
    memcpy(region.base, rdata->data, rdata->length);
    isc_buffer_add(target, 4);
    return (ISC_R_SUCCESS);
}

static inline int
compare_in_a(dns_rdata_t *rdata1, dns_rdata_t *rdata2) {
    isc_region_t r1;
    isc_region_t r2;

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == 1);
    REQUIRE(rdata1->rdclass == 1);

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

static inline isc_result_t
fromstruct_in_a(dns_rdataclass_t rdclass, dns_rdatatype_t type, void *source,
            isc_buffer_t *target)
{
    UNUSED(source);
    UNUSED(target);

    REQUIRE(type == 1);
    REQUIRE(rdclass == 1);

    return (ISC_R_NOTIMPLEMENTED);
}

static inline isc_result_t
tostruct_in_a(dns_rdata_t *rdata, void *target, isc_mem_t *mctx) {
    dns_rdata_in_a_t *a = target;
    isc_uint32_t n;
    isc_region_t region;

    UNUSED(mctx);

    REQUIRE(rdata->type == 1);
    REQUIRE(rdata->rdclass == 1);

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

    dns_rdata_toregion(rdata, &region);
    n = uint32_fromregion(&region);
    a->in_addr.s_addr = htonl(n);

    return (ISC_R_SUCCESS);
}

static inline void
freestruct_in_a(void *source) {
    UNUSED(source);
    REQUIRE(source != NULL);
    REQUIRE(ISC_FALSE); /*XXX*/
}

static inline isc_result_t
additionaldata_in_a(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
            void *arg)
{
    UNUSED(add);
    UNUSED(arg);

    REQUIRE(rdata->type == 1);
    REQUIRE(rdata->rdclass == 1);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_in_a(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg) {
    isc_region_t r;

    REQUIRE(rdata->type == 1);
    REQUIRE(rdata->rdclass == 1);

    dns_rdata_toregion(rdata, &r);

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

#endif  /* RDATA_IN_1_A_1_C */