rdata/generic/sig_24.c

	sig_24.c revision 82ca33427bdd4f3bc4ed3431e86bd810fe751674
/*
 * Copyright (C) 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: sig_24.c,v 1.34 2000/04/28 01:24:09 gson Exp $ */

/* Reviewed: Fri Mar 17 09:05:02 PST 2000 by gson */

/* RFC 2535 */

#ifndef RDATA_GENERIC_SIG_24_C
#define RDATA_GENERIC_SIG_24_C

#define RRTYPE_SIG_ATTRIBUTES (DNS_RDATATYPEATTR_DNSSEC)

static inline isc_result_t
fromtext_sig(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;
    unsigned char c;
    long i;
    dns_rdatatype_t covered;
    char *e;
    isc_result_t result;
    dns_name_t name;
    isc_buffer_t buffer;
    isc_uint32_t time_signed, time_expire;

    REQUIRE(type == 24);

    UNUSED(rdclass);

    /* type covered */
    RETERR(gettoken(lexer, &token, isc_tokentype_string, ISC_FALSE));
    result = dns_rdatatype_fromtext(&covered, &token.value.as_textregion);
    if (result != ISC_R_SUCCESS && result != ISC_R_NOTIMPLEMENTED) {
        i = strtol(token.value.as_pointer, &e, 10);
        if (i < 0 || i > 65535)
            return (DNS_R_RANGE);
        if (*e != 0)
            return (result);
        covered = (dns_rdatatype_t)i;
    }
    RETERR(uint16_tobuffer(covered, target));

    /* algorithm */
    RETERR(gettoken(lexer, &token, isc_tokentype_string, ISC_FALSE));
    RETERR(dns_secalg_fromtext(&c, &token.value.as_textregion));
    RETERR(mem_tobuffer(target, &c, 1));

    /* labels */
    RETERR(gettoken(lexer, &token, isc_tokentype_number, ISC_FALSE));
    if (token.value.as_ulong > 0xff)
        return (DNS_R_RANGE);
    c = (unsigned char)token.value.as_ulong;
    RETERR(mem_tobuffer(target, &c, 1));

    /* original ttl */
    RETERR(gettoken(lexer, &token, isc_tokentype_number, ISC_FALSE));
    RETERR(uint32_tobuffer(token.value.as_ulong, target));

    /* signature expiration */
    RETERR(gettoken(lexer, &token, isc_tokentype_string, ISC_FALSE));
    RETERR(dns_time32_fromtext(token.value.as_pointer, &time_expire));
    RETERR(uint32_tobuffer(time_expire, target));

    /* time signed */
    RETERR(gettoken(lexer, &token, isc_tokentype_string, ISC_FALSE));
    RETERR(dns_time32_fromtext(token.value.as_pointer, &time_signed));
    RETERR(uint32_tobuffer(time_signed, target));

    /* key footprint */
    RETERR(gettoken(lexer, &token, isc_tokentype_number, ISC_FALSE));
    RETERR(uint16_tobuffer(token.value.as_ulong, target));

    /* signer */
    RETERR(gettoken(lexer, &token, isc_tokentype_string, ISC_FALSE));
    dns_name_init(&name, NULL);
    buffer_fromregion(&buffer, &token.value.as_region);
    origin = (origin != NULL) ? origin : dns_rootname;
    RETERR(dns_name_fromtext(&name, &buffer, origin, downcase, target));

    /* sig */
    return (isc_base64_tobuffer(lexer, target, -1));
}

static inline isc_result_t
totext_sig(dns_rdata_t *rdata, dns_rdata_textctx_t *tctx,
          isc_buffer_t *target)
{
    isc_region_t sr;
    char buf[sizeof "4294967295"];
    dns_rdatatype_t covered;
    unsigned long ttl;
    unsigned long when;
    unsigned long exp;
    unsigned long foot;
    dns_name_t name;
    dns_name_t prefix;
    isc_boolean_t sub;

    REQUIRE(rdata->type == 24);

    dns_rdata_toregion(rdata, &sr);

    /* type covered */
    covered = uint16_fromregion(&sr);
    isc_region_consume(&sr, 2);
    RETERR(dns_rdatatype_totext(covered, target));
    RETERR(str_totext(" ", target));

    /* algorithm */
    sprintf(buf, "%u", sr.base[0]);
    isc_region_consume(&sr, 1);
    RETERR(str_totext(buf, target));
    RETERR(str_totext(" ", target));

    /* labels */
    sprintf(buf, "%u", sr.base[0]);
    isc_region_consume(&sr, 1);
    RETERR(str_totext(buf, target));
    RETERR(str_totext(" ", target));

    /* ttl */
    ttl = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);
    sprintf(buf, "%lu", ttl);
    RETERR(str_totext(buf, target));
    RETERR(str_totext(" ", target));

    /* sig exp */
    exp = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);
    RETERR(dns_time32_totext(exp, target));

    if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
        RETERR(str_totext(" (", target));
    RETERR(str_totext(tctx->linebreak, target));

    /* time signed */
    when = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);
    RETERR(dns_time32_totext(when, target));
    RETERR(str_totext(" ", target));

    /* footprint */
    foot = uint16_fromregion(&sr);
    isc_region_consume(&sr, 2);
    sprintf(buf, "%lu", foot);
    RETERR(str_totext(buf, target));
    RETERR(str_totext(" ", target));

    /* signer */
    dns_name_init(&name, NULL);
    dns_name_init(&prefix, NULL);
    dns_name_fromregion(&name, &sr);
    isc_region_consume(&sr, name_length(&name));
    sub = name_prefix(&name, tctx->origin, &prefix);
    RETERR(dns_name_totext(&prefix, sub, target));

    /* sig */
    RETERR(str_totext(tctx->linebreak, target));
    RETERR(isc_base64_totext(&sr, tctx->width - 2,
                    tctx->linebreak, target));
    if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
        RETERR(str_totext(" )", target));

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_sig(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 sr;
    dns_name_t name;

    REQUIRE(type == 24);

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

    UNUSED(rdclass);

    isc_buffer_activeregion(source, &sr);
    /*
     * type covered: 2
     * algorithm: 1
     * labels: 1
     * original ttl: 4
     * signature expiration: 4
     * time signed: 4
     * key footprint: 2
     */
    if (sr.length < 18)
        return (ISC_R_UNEXPECTEDEND);

    isc_buffer_forward(source, 18);
    RETERR(mem_tobuffer(target, sr.base, 18));

    /* signer */
    dns_name_init(&name, NULL);
    RETERR(dns_name_fromwire(&name, source, dctx, downcase, target));

    /* sig */
    isc_buffer_activeregion(source, &sr);
    isc_buffer_forward(source, sr.length);
    return (mem_tobuffer(target, sr.base, sr.length));
}

static inline isc_result_t
towire_sig(dns_rdata_t *rdata, dns_compress_t *cctx, isc_buffer_t *target) {
    isc_region_t sr;
    dns_name_t name;

    REQUIRE(rdata->type == 24);

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

    dns_rdata_toregion(rdata, &sr);
    /*
     * type covered: 2
     * algorithm: 1
     * labels: 1
     * original ttl: 4
     * signature expiration: 4
     * time signed: 4
     * key footprint: 2
     */
    RETERR(mem_tobuffer(target, sr.base, 18));
    isc_region_consume(&sr, 18);

    /* signer */
    dns_name_init(&name, NULL);
    dns_name_fromregion(&name, &sr);
    isc_region_consume(&sr, name_length(&name));
    RETERR(dns_name_towire(&name, cctx, target));

    /* signature */
    return (mem_tobuffer(target, sr.base, sr.length));
}

static inline int
compare_sig(dns_rdata_t *rdata1, dns_rdata_t *rdata2) {
    isc_region_t r1;
    isc_region_t r2;
    dns_name_t name1;
    dns_name_t name2;
    int order;

    REQUIRE(rdata1->type == rdata2->type);
    REQUIRE(rdata1->rdclass == rdata2->rdclass);
    REQUIRE(rdata1->type == 24);

    dns_rdata_toregion(rdata1, &r1);
    dns_rdata_toregion(rdata2, &r2);

    INSIST(r1.length > 18);
    INSIST(r2.length > 18);
    r1.length = 18;
    r2.length = 18;
    order = compare_region(&r1, &r2);
    if (order != 0)
        return (order);

    dns_name_init(&name1, NULL);
    dns_name_init(&name2, NULL);
    dns_rdata_toregion(rdata1, &r1);
    dns_rdata_toregion(rdata2, &r2);
    isc_region_consume(&r1, 18);
    isc_region_consume(&r2, 18);
    dns_name_fromregion(&name1, &r1);
    dns_name_fromregion(&name2, &r2);
    order = dns_name_rdatacompare(&name1, &name2);
    if (order != 0)
        return (order);

    isc_region_consume(&r1, name_length(&name1));
    isc_region_consume(&r2, name_length(&name2));

    return (compare_region(&r1, &r2));
}

static inline isc_result_t
fromstruct_sig(dns_rdataclass_t rdclass, dns_rdatatype_t type, void *source,
           isc_buffer_t *target)
{
    isc_region_t tr;
    dns_rdata_generic_sig_t *sig;
    dns_compress_t cctx;

    REQUIRE(type == 24);

    UNUSED(rdclass);

    sig = (dns_rdata_generic_sig_t *) source;
    REQUIRE(sig->mctx != NULL);

    /* Type covered */
    RETERR(uint16_tobuffer(sig->covered, target));

    /* Algorithm */
    RETERR(uint8_tobuffer(sig->algorithm, target));

    /* Labels */
    RETERR(uint8_tobuffer(sig->labels, target));

    /* Original TTL */
    RETERR(uint32_tobuffer(sig->originalttl, target));

    /* Expire time */
    RETERR(uint32_tobuffer(sig->timeexpire, target));

    /* Time signed */
    RETERR(uint32_tobuffer(sig->timesigned, target));

    /* Key ID */
    RETERR(uint16_tobuffer(sig->keyid, target));

    /* Signer name */
    RETERR(dns_compress_init(&cctx, -1, sig->mctx));
    dns_compress_setmethods(&cctx, DNS_COMPRESS_NONE);
    RETERR(dns_name_towire(&sig->signer, &cctx, target));
    dns_compress_invalidate(&cctx);

    /* Signature */
    if (sig->siglen > 0) {
        isc_buffer_availableregion(target, &tr);
        if (tr.length < sig->siglen)
            return (ISC_R_NOSPACE);
        memcpy(tr.base, sig->signature, sig->siglen);
        isc_buffer_add(target, sig->siglen);
    }

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
tostruct_sig(dns_rdata_t *rdata, void *target, isc_mem_t *mctx) {
    isc_region_t sr;
    dns_rdata_generic_sig_t *sig;
    dns_name_t signer;

    REQUIRE(rdata->type == 24);

    sig = (dns_rdata_generic_sig_t *) target;
    sig->common.rdclass = rdata->rdclass;
    sig->common.rdtype = rdata->type;
    ISC_LINK_INIT(&sig->common, link);
    sig->mctx = mctx;
    dns_rdata_toregion(rdata, &sr);

    /* Type covered */
    if (sr.length < 2)
        return (ISC_R_UNEXPECTEDEND);
    sig->covered = uint16_fromregion(&sr);
    isc_region_consume(&sr, 2);

    /* Algorithm */
    if (sr.length < 1)
        return (ISC_R_UNEXPECTEDEND);
    sig->algorithm = uint8_fromregion(&sr);
    isc_region_consume(&sr, 1);

    /* Labels */
    if (sr.length < 1)
        return (ISC_R_UNEXPECTEDEND);
    sig->labels = uint8_fromregion(&sr);
    isc_region_consume(&sr, 1);

    /* Original TTL */
    if (sr.length < 4)
        return (ISC_R_UNEXPECTEDEND);
    sig->originalttl = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);

    /* Expire time */
    if (sr.length < 4)
        return (ISC_R_UNEXPECTEDEND);
    sig->timeexpire = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);

    /* Time signed */
    if (sr.length < 4)
        return (ISC_R_UNEXPECTEDEND);
    sig->timesigned = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);

    /* Key ID */
    if (sr.length < 2)
        return (ISC_R_UNEXPECTEDEND);
    sig->keyid = uint16_fromregion(&sr);
    isc_region_consume(&sr, 2);

    dns_name_init(&signer, NULL);
    dns_name_fromregion(&signer, &sr);
    dns_name_init(&sig->signer, NULL);
    RETERR(dns_name_dup(&signer, mctx, &sig->signer));
    isc_region_consume(&sr, name_length(&sig->signer));

    /* Signature */
    sig->siglen = sr.length;
    sig->signature = isc_mem_get(mctx, sig->siglen);
    if (sig->signature == NULL)
        return (ISC_R_NOMEMORY);
    memcpy(sig->signature, sr.base, sig->siglen);
    isc_region_consume(&sr, sig->siglen);

    return (ISC_R_SUCCESS);
}

static inline void
freestruct_sig(void *source) {
    dns_rdata_generic_sig_t *sig = (dns_rdata_generic_sig_t *) source;

    REQUIRE(source != NULL);
    REQUIRE(sig->common.rdtype == 24);

    dns_name_free(&sig->signer, sig->mctx);
    if (sig->signature != NULL)
        isc_mem_put(sig->mctx, sig->signature, sig->siglen);
}

static inline isc_result_t
additionaldata_sig(dns_rdata_t *rdata, dns_additionaldatafunc_t add,
           void *arg)
{
    REQUIRE(rdata->type == 24);

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

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_sig(dns_rdata_t *rdata, dns_digestfunc_t digest, void *arg) {

    REQUIRE(rdata->type == 24);

    UNUSED(rdata);
    UNUSED(digest);
    UNUSED(arg);

    return (ISC_R_NOTIMPLEMENTED);
}

static inline dns_rdatatype_t
covers_sig(dns_rdata_t *rdata) {
    dns_rdatatype_t type;
    isc_region_t r;

    REQUIRE(rdata->type == 24);

    dns_rdata_toregion(rdata, &r);
    type = uint16_fromregion(&r);

    return (type);
}

#endif  /* RDATA_GENERIC_SIG_24_C */