/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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 1.13 2020/09/14 08:40:43 florian Exp $ */

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

/* RFC2535 */

#ifndef RDATA_GENERIC_SIG_24_C
#define RDATA_GENERIC_SIG_24_C

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;
        int sub;

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

        dns_rdata_toregion(rdata, &sr);

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

        RETERR(dns_rdatatype_totext(covered, target));
        RETERR(isc_str_tobuffer(" ", target));

        /*
         * Algorithm.
         */
        snprintf(buf, sizeof(buf), "%u", sr.base[0]);
        isc_region_consume(&sr, 1);
        RETERR(isc_str_tobuffer(buf, target));
        RETERR(isc_str_tobuffer(" ", target));

        /*
         * Labels.
         */
        snprintf(buf, sizeof(buf), "%u", sr.base[0]);
        isc_region_consume(&sr, 1);
        RETERR(isc_str_tobuffer(buf, target));
        RETERR(isc_str_tobuffer(" ", target));

        /*
         * Ttl.
         */
        ttl = uint32_fromregion(&sr);
        isc_region_consume(&sr, 4);
        snprintf(buf, sizeof(buf), "%lu", ttl);
        RETERR(isc_str_tobuffer(buf, target));
        RETERR(isc_str_tobuffer(" ", 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(isc_str_tobuffer(" (", target));
        RETERR(isc_str_tobuffer(tctx->linebreak, target));

        /*
         * Time signed.
         */
        when = uint32_fromregion(&sr);
        isc_region_consume(&sr, 4);
        RETERR(dns_time32_totext(when, target));
        RETERR(isc_str_tobuffer(" ", target));

        /*
         * Footprint.
         */
        foot = uint16_fromregion(&sr);
        isc_region_consume(&sr, 2);
        snprintf(buf, sizeof(buf), "%lu", foot);
        RETERR(isc_str_tobuffer(buf, target));
        RETERR(isc_str_tobuffer(" ", 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(isc_str_tobuffer(tctx->linebreak, target));
        if (tctx->width == 0)   /* No splitting */
                RETERR(isc_base64_totext(&sr, 60, "", target));
        else
                RETERR(isc_base64_totext(&sr, tctx->width - 2,
                                         tctx->linebreak, target));
        if ((tctx->flags & DNS_STYLEFLAG_MULTILINE) != 0)
                RETERR(isc_str_tobuffer(" )", target));

        return (ISC_R_SUCCESS);
}

static inline isc_result_t
fromwire_sig(ARGS_FROMWIRE) {
        isc_region_t sr;
        dns_name_t name;

        REQUIRE(type == dns_rdatatype_sig);

        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(isc_mem_tobuffer(target, sr.base, 18));

        /*
         * Signer.
         */
        dns_name_init(&name, NULL);
        RETERR(dns_name_fromwire(&name, source, dctx, options, target));

        /*
         * Sig.
         */
        isc_buffer_activeregion(source, &sr);
        isc_buffer_forward(source, sr.length);
        return (isc_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 == dns_rdatatype_sig);
        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(isc_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 (isc_mem_tobuffer(target, sr.base, sr.length));
}

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

        REQUIRE(rdata->type == dns_rdatatype_sig);

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

        return (type);
}

#endif  /* RDATA_GENERIC_SIG_24_C */