rdata/generic/sig_24.c

	sig_24.c revision ae114ded82e773a4d9058f833f964a17514712a8
/*
 * Copyright (C) 1999-2001  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 1.52 2001/03/16 22:53:01 bwelling 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(ARGS_FROMTEXT) {
    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(type);
    UNUSED(rdclass);

    /*
     * Type covered.
     */
    RETERR(isc_lex_getmastertoken(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)
            RETTOK(ISC_R_RANGE);
        if (*e != 0)
            RETTOK(result);
        covered = (dns_rdatatype_t)i;
    }
    RETERR(uint16_tobuffer(covered, target));

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

    /*
     * Labels.
     */
    RETERR(isc_lex_getmastertoken(lexer, &token, isc_tokentype_number,
                      ISC_FALSE));
    if (token.value.as_ulong > 0xff)
        RETTOK(ISC_R_RANGE);
    c = (unsigned char)token.value.as_ulong;
    RETERR(mem_tobuffer(target, &c, 1));

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

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

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

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

    /*
     * Signer.
     */
    RETERR(isc_lex_getmastertoken(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;
    RETTOK(dns_name_fromtext(&name, &buffer, origin, downcase, target));

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

static inline isc_result_t
totext_sig(ARGS_TOTEXT) {
    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);
    REQUIRE(rdata->length != 0);

    dns_rdata_toregion(rdata, &sr);

    /*
     * Type covered.
     */
    covered = uint16_fromregion(&sr);
    isc_region_consume(&sr, 2);
    /*
     * XXXAG We should have something like dns_rdatatype_isknown()
     * that does the right thing with type 0.
     */
    if (dns_rdatatype_isknown(covered) && covered != 0) {
        RETERR(dns_rdatatype_totext(covered, target));
    } else {
        char buf[sizeof "65535"];
        sprintf(buf, "%u", covered);
        RETERR(str_totext(buf, 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(ARGS_FROMWIRE) {
    isc_region_t sr;
    dns_name_t name;

    REQUIRE(type == 24);

    UNUSED(type);
    UNUSED(rdclass);

    dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);

    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(ARGS_TOWIRE) {
    isc_region_t sr;
    dns_name_t name;
    dns_offsets_t offsets;

    REQUIRE(rdata->type == 24);
    REQUIRE(rdata->length != 0);

    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, offsets);
    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(ARGS_COMPARE) {
    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);
    REQUIRE(rdata1->length != 0);
    REQUIRE(rdata2->length != 0);

    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(ARGS_FROMSTRUCT) {
    dns_rdata_sig_t *sig = source;

    REQUIRE(type == 24);
    REQUIRE(source != NULL);
    REQUIRE(sig->common.rdtype == type);
    REQUIRE(sig->common.rdclass == rdclass);
    REQUIRE((sig->signature != NULL && sig->siglen != 0) ||
        (sig->signature == NULL && sig->siglen == 0));

    UNUSED(type);
    UNUSED(rdclass);

    /*
     * 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(name_tobuffer(&sig->signer, target));

    /*
     * Signature.
     */
    return (mem_tobuffer(target, sig->signature, sig->siglen));
}

static inline isc_result_t
tostruct_sig(ARGS_TOSTRUCT) {
    isc_region_t sr;
    dns_rdata_sig_t *sig = target;
    dns_name_t signer;

    REQUIRE(rdata->type == 24);
    REQUIRE(target != NULL);
    REQUIRE(rdata->length != 0);

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

    dns_rdata_toregion(rdata, &sr);

    /*
     * Type covered.
     */
    sig->covered = uint16_fromregion(&sr);
    isc_region_consume(&sr, 2);

    /*
     * Algorithm.
     */
    sig->algorithm = uint8_fromregion(&sr);
    isc_region_consume(&sr, 1);

    /*
     * Labels.
     */
    sig->labels = uint8_fromregion(&sr);
    isc_region_consume(&sr, 1);

    /*
     * Original TTL.
     */
    sig->originalttl = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);

    /*
     * Expire time.
     */
    sig->timeexpire = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);

    /*
     * Time signed.
     */
    sig->timesigned = uint32_fromregion(&sr);
    isc_region_consume(&sr, 4);

    /*
     * Key ID.
     */
    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(name_duporclone(&signer, mctx, &sig->signer));
    isc_region_consume(&sr, name_length(&sig->signer));

    /*
     * Signature.
     */
    sig->siglen = sr.length;
    if (sig->siglen > 0) {
        sig->signature = mem_maybedup(mctx, sr.base, sig->siglen);
        if (sig->signature == NULL)
            goto cleanup;
    } else
        sig->signature = NULL;


    sig->mctx = mctx;
    return (ISC_R_SUCCESS);

 cleanup:
    if (mctx != NULL)
        dns_name_free(&sig->signer, mctx);
    return (ISC_R_NOMEMORY);
}

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

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

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

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

static inline isc_result_t
additionaldata_sig(ARGS_ADDLDATA) {
    REQUIRE(rdata->type == 24);

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

    return (ISC_R_SUCCESS);
}

static inline isc_result_t
digest_sig(ARGS_DIGEST) {

    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 */