rdata/generic/mx_15.c

	mx_15.c revision f1b0e9107d5fc7669920b76b4e32f93e9d16c85c
/*
 * Copyright (C) 1998, 1999  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: mx_15.c,v 1.18 1999/08/03 01:21:23 halley Exp $ */

#ifndef RDATA_GENERIC_MX_15_C
#define RDATA_GENERIC_MX_15_C

static dns_result_t
fromtext_mx(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;
    dns_name_t name;
    isc_buffer_t buffer;

    REQUIRE(type == 15);

    rdclass = rdclass;  /*unused*/

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

    RETERR(uint16_tobuffer(token.value.as_ulong, target));

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

    dns_name_init(&name, NULL);
    buffer_fromregion(&buffer, &token.value.as_region,
              ISC_BUFFERTYPE_TEXT);
    origin = (origin != NULL) ? origin : dns_rootname;
    return (dns_name_fromtext(&name, &buffer, origin, downcase, target));
}

static dns_result_t
totext_mx(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
      isc_buffer_t *target)
{
    isc_region_t region;
    dns_name_t name;
    dns_name_t prefix;
    isc_boolean_t sub;
    char buf[sizeof "64000"];
    unsigned short num;

    REQUIRE(rdata->type == 15);

    dns_name_init(&name, NULL);
    dns_name_init(&prefix, NULL);

    dns_rdata_toregion(rdata, &region);
    num = uint16_fromregion(&region);
    isc_region_consume(&region, 2);
    sprintf(buf, "%u", num);
    RETERR(str_totext(buf, target));
    RETERR(str_totext(" ", target));
    dns_name_fromregion(&name, &region);
    sub = name_prefix(&name, tctx->origin, &prefix);
    return(dns_name_totext(&prefix, sub, target));
}

static dns_result_t
fromwire_mx(dns_rdataclass_t rdclass, dns_rdatatype_t type,
        isc_buffer_t *source, dns_decompress_t *dctx,
        isc_boolean_t downcase, isc_buffer_t *target)
{
        dns_name_t name;
    isc_region_t sregion;
    isc_region_t tregion;

    REQUIRE(type == 15);

    rdclass = rdclass;      /* unused */

    if (dns_decompress_edns(dctx) >= 1 || !dns_decompress_strict(dctx))
        dns_decompress_setmethods(dctx, DNS_COMPRESS_ALL);
    else
        dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);

        dns_name_init(&name, NULL);

    isc_buffer_active(source, &sregion);
    isc_buffer_available(target, &tregion);
    if (tregion.length < 2)
        return (DNS_R_NOSPACE);
    if (sregion.length < 2)
        return (DNS_R_UNEXPECTEDEND);
    memcpy(tregion.base, sregion.base, 2);
    isc_buffer_forward(source, 2);
    isc_buffer_add(target, 2);
    return (dns_name_fromwire(&name, source, dctx, downcase, target));
}

static dns_result_t
towire_mx(dns_rdata_t *rdata, dns_compress_t *cctx, isc_buffer_t *target) {
    dns_name_t name;
    isc_region_t region;
    isc_region_t tr;

    REQUIRE(rdata->type == 15);

    if (dns_compress_getedns(cctx) >= 1)
        dns_compress_setmethods(cctx, DNS_COMPRESS_ALL);
    else
        dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);

    isc_buffer_available(target, &tr);
    dns_rdata_toregion(rdata, &region);
    if (tr.length < 2)
        return (DNS_R_NOSPACE);
    memcpy(tr.base, region.base, 2);
    isc_region_consume(&region, 2);
    isc_buffer_add(target, 2);

    dns_name_init(&name, NULL);
    dns_name_fromregion(&name, &region);

    return (dns_name_towire(&name, cctx, target));
}

static int
compare_mx(dns_rdata_t *rdata1, dns_rdata_t *rdata2) {
    dns_name_t name1;
    dns_name_t name2;
    isc_region_t region1;
    isc_region_t region2;
    int result;

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == 15);

    result = memcmp(rdata1->data, rdata2->data, 2);
    if (result != 0)
        return (result < 0 ? -1 : 1);

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

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

    isc_region_consume(&region1, 2);
    isc_region_consume(&region2, 2);

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

    return (dns_name_rdatacompare(&name1, &name2));
}

static dns_result_t
fromstruct_mx(dns_rdataclass_t rdclass, dns_rdatatype_t type, void *source,
          isc_buffer_t *target)
{

    REQUIRE(type == 15);

    rdclass = rdclass;  /*unused*/

    source = source;
    target = target;

    return (DNS_R_NOTIMPLEMENTED);
}

static dns_result_t
tostruct_mx(dns_rdata_t *rdata, void *target, isc_mem_t *mctx) {

    REQUIRE(rdata->type == 15);

    target = target;
    mctx = mctx;

    return (DNS_R_NOTIMPLEMENTED);
}

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

static dns_result_t
additionaldata_mx(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
          void *arg)
{
    dns_name_t name;
    isc_region_t region;

    REQUIRE(rdata->type == 15);

    dns_name_init(&name, NULL);
    dns_rdata_toregion(rdata, &region);
    isc_region_consume(&region, 2);
    dns_name_fromregion(&name, &region);

    return ((add)(arg, &name, dns_rdatatype_a));
}

#endif  /* RDATA_GENERIC_MX_15_C */