rdata/ch_3/a_1.c

/*
 * Copyright (C) 2005, 2007, 2009, 2014-2017  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: a_1.c,v 1.8 2009/12/04 22:06:37 tbox Exp $ */

/* by Bjorn.Victor@it.uu.se, 2005-05-07 */
/* Based on generic/soa_6.c and generic/mx_15.c */

#ifndef RDATA_CH_3_A_1_C
#define RDATA_CH_3_A_1_C

#include <isc/net.h>

#define RRTYPE_A_ATTRIBUTES (0)

static inline isc_result_t
fromtext_ch_a(ARGS_FROMTEXT) {
    isc_token_t token;
    dns_name_t name;
    isc_buffer_t buffer;

    REQUIRE(type == dns_rdatatype_a);
    REQUIRE(rdclass == dns_rdataclass_ch); /* 3 */

    UNUSED(type);
    UNUSED(callbacks);

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

    /* get domain name */
    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));
    if ((options & DNS_RDATA_CHECKNAMES) != 0 &&
        (options & DNS_RDATA_CHECKREVERSE) != 0) {
        isc_boolean_t ok;
        ok = dns_name_ishostname(&name, ISC_FALSE);
        if (!ok && (options & DNS_RDATA_CHECKNAMESFAIL) != 0)
            RETTOK(DNS_R_BADNAME);
        if (!ok && callbacks != NULL)
            warn_badname(&name, lexer, callbacks);
    }

    /* 16-bit octal address */
    RETERR(isc_lex_getoctaltoken(lexer, &token, ISC_FALSE));
    if (token.value.as_ulong > 0xffffU)
        RETTOK(ISC_R_RANGE);
    return (uint16_tobuffer(token.value.as_ulong, target));
}

static inline isc_result_t
totext_ch_a(ARGS_TOTEXT) {
    isc_region_t region;
    dns_name_t name;
    dns_name_t prefix;
    isc_boolean_t sub;
    char buf[sizeof("0177777")];
    isc_uint16_t addr;

    REQUIRE(rdata->type == dns_rdatatype_a);
    REQUIRE(rdata->rdclass == dns_rdataclass_ch); /* 3 */
    REQUIRE(rdata->length != 0);

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

    dns_rdata_toregion(rdata, &region);
    dns_name_fromregion(&name, &region);
    isc_region_consume(&region, name_length(&name));
    addr = uint16_fromregion(&region);

    sub = name_prefix(&name, tctx->origin, &prefix);
    RETERR(dns_name_totext(&prefix, sub, target));

    snprintf(buf, sizeof(buf), "%o", addr); /* note octal */
    RETERR(str_totext(" ", target));
    return (str_totext(buf, target));
}

static inline isc_result_t
fromwire_ch_a(ARGS_FROMWIRE) {
    isc_region_t sregion;
    isc_region_t tregion;
    dns_name_t name;

    REQUIRE(type == dns_rdatatype_a);
    REQUIRE(rdclass == dns_rdataclass_ch);

    UNUSED(type);
    UNUSED(rdclass);

    dns_decompress_setmethods(dctx, DNS_COMPRESS_GLOBAL14);

    dns_name_init(&name, NULL);

    RETERR(dns_name_fromwire(&name, source, dctx, options, target));

    isc_buffer_activeregion(source, &sregion);
    isc_buffer_availableregion(target, &tregion);
    if (sregion.length < 2)
        return (ISC_R_UNEXPECTEDEND);
    if (tregion.length < 2)
        return (ISC_R_NOSPACE);

    memmove(tregion.base, sregion.base, 2);
    isc_buffer_forward(source, 2);
    isc_buffer_add(target, 2);

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_ch_a(ARGS_TOWIRE) {
    dns_name_t name;
    dns_offsets_t offsets;
    isc_region_t sregion;
    isc_region_t tregion;

    REQUIRE(rdata->type == dns_rdatatype_a);
    REQUIRE(rdata->rdclass == dns_rdataclass_ch);
    REQUIRE(rdata->length != 0);

    dns_compress_setmethods(cctx, DNS_COMPRESS_GLOBAL14);

    dns_name_init(&name, offsets);

    dns_rdata_toregion(rdata, &sregion);

    dns_name_fromregion(&name, &sregion);
    isc_region_consume(&sregion, name_length(&name));
    RETERR(dns_name_towire(&name, cctx, target));

    isc_buffer_availableregion(target, &tregion);
    if (tregion.length < 2)
        return (ISC_R_NOSPACE);

    memmove(tregion.base, sregion.base, 2);
    isc_buffer_add(target, 2);
    return (ISC_R_SUCCESS);
}

static inline int
compare_ch_a(ARGS_COMPARE) {
    dns_name_t name1;
    dns_name_t name2;
    isc_region_t region1;
    isc_region_t region2;
    int order;

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == dns_rdatatype_a);
    REQUIRE(rdata1->rdclass == dns_rdataclass_ch);
    REQUIRE(rdata1->length != 0);
    REQUIRE(rdata2->length != 0);

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

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

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

    order = dns_name_rdatacompare(&name1, &name2);
    if (order != 0)
        return (order);

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

static inline isc_result_t
fromstruct_ch_a(ARGS_FROMSTRUCT) {
    dns_rdata_ch_a_t *a = source;
    isc_region_t region;

    REQUIRE(type == dns_rdatatype_a);
    REQUIRE(source != NULL);
    REQUIRE(a->common.rdtype == type);
    REQUIRE(a->common.rdclass == rdclass);

    UNUSED(type);
    UNUSED(rdclass);

    dns_name_toregion(&a->ch_addr_dom, &region);
    RETERR(isc_buffer_copyregion(target, &region));

    return (uint16_tobuffer(ntohs(a->ch_addr), target));
}

static inline isc_result_t
tostruct_ch_a(ARGS_TOSTRUCT) {
    dns_rdata_ch_a_t *a = target;
    isc_region_t region;
    dns_name_t name;

    REQUIRE(rdata->type == dns_rdatatype_a);
    REQUIRE(rdata->rdclass == dns_rdataclass_ch);
    REQUIRE(rdata->length != 0);

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

    dns_rdata_toregion(rdata, &region);

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

    dns_name_init(&a->ch_addr_dom, NULL);
    RETERR(name_duporclone(&name, mctx, &a->ch_addr_dom));
    a->ch_addr = htons(uint16_fromregion(&region));
    a->mctx = mctx;
    return (ISC_R_SUCCESS);
}

static inline void
freestruct_ch_a(ARGS_FREESTRUCT) {
    dns_rdata_ch_a_t *a = source;

    REQUIRE(source != NULL);
    REQUIRE(a->common.rdtype == dns_rdatatype_a);

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

    dns_name_free(&a->ch_addr_dom, a->mctx);
    a->mctx = NULL;
}

static inline isc_result_t
additionaldata_ch_a(ARGS_ADDLDATA) {

    REQUIRE(rdata->type == dns_rdatatype_a);
    REQUIRE(rdata->rdclass == dns_rdataclass_ch);

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

    return (ISC_R_SUCCESS);
}

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

    REQUIRE(rdata->type == dns_rdatatype_a);
    REQUIRE(rdata->rdclass == dns_rdataclass_ch);

    dns_rdata_toregion(rdata, &r);
    dns_name_init(&name, NULL);
    dns_name_fromregion(&name, &r);
    isc_region_consume(&r, name_length(&name));
    RETERR(dns_name_digest(&name, digest, arg));
    return ((digest)(arg, &r));
}

static inline isc_boolean_t
checkowner_ch_a(ARGS_CHECKOWNER) {

    REQUIRE(type == dns_rdatatype_a);
    REQUIRE(rdclass == dns_rdataclass_ch);

    UNUSED(type);

    return (dns_name_ishostname(name, wildcard));
}

static inline isc_boolean_t
checknames_ch_a(ARGS_CHECKNAMES) {
    isc_region_t region;
    dns_name_t name;

    REQUIRE(rdata->type == dns_rdatatype_a);
    REQUIRE(rdata->rdclass == dns_rdataclass_ch);

    UNUSED(owner);

    dns_rdata_toregion(rdata, &region);
    dns_name_init(&name, NULL);
    dns_name_fromregion(&name, &region);
    if (!dns_name_ishostname(&name, ISC_FALSE)) {
        if (bad != NULL)
            dns_name_clone(&name, bad);
        return (ISC_FALSE);
    }

    return (ISC_TRUE);
}

static inline int
casecompare_ch_a(ARGS_COMPARE) {
    return (compare_ch_a(rdata1, rdata2));
}
#endif  /* RDATA_CH_3_A_1_C */