/*
 * 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: hip_55.c,v 1.15 2020/09/14 08:40:43 florian Exp $ */

/* reviewed: TBC */

/* RFC 5205 */

#ifndef RDATA_GENERIC_HIP_5_C
#define RDATA_GENERIC_HIP_5_C

static inline isc_result_t
totext_hip(ARGS_TOTEXT) {
        isc_region_t region;
        dns_name_t name;
        unsigned int length, key_len, hit_len;
        unsigned char algorithm;
        char buf[sizeof("225 ")];

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

        dns_rdata_toregion(rdata, &region);

        hit_len = uint8_fromregion(&region);
        isc_region_consume(&region, 1);

        algorithm = uint8_fromregion(&region);
        isc_region_consume(&region, 1);

        key_len = uint16_fromregion(&region);
        isc_region_consume(&region, 2);

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

        /*
         * Algorithm
         */
        snprintf(buf, sizeof(buf), "%u ", algorithm);
        RETERR(isc_str_tobuffer(buf, target));

        /*
         * HIT.
         */
        INSIST(hit_len < region.length);
        length = region.length;
        region.length = hit_len;
        RETERR(isc_hex_totext(&region, 1, "", target));
        region.length = length - hit_len;
        RETERR(isc_str_tobuffer(tctx->linebreak, target));

        /*
         * Public KEY.
         */
        INSIST(key_len <= region.length);
        length = region.length;
        region.length = key_len;
        RETERR(isc_base64_totext(&region, 1, "", target));
        region.length = length - key_len;
        RETERR(isc_str_tobuffer(tctx->linebreak, target));

        /*
         * Rendezvous Servers.
         */
        dns_name_init(&name, NULL);
        while (region.length > 0) {
                dns_name_fromregion(&name, &region);

                RETERR(dns_name_totext(&name, 0, target));
                isc_region_consume(&region, name.length);
                if (region.length > 0)
                        RETERR(isc_str_tobuffer(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_hip(ARGS_FROMWIRE) {
        isc_region_t region, rr;
        dns_name_t name;
        uint8_t hit_len;
        uint16_t key_len;

        REQUIRE(type == dns_rdatatype_hip);

        UNUSED(type);
        UNUSED(rdclass);

        isc_buffer_activeregion(source, &region);
        if (region.length < 4U)
                return (DNS_R_FORMERR);

        rr = region;
        hit_len = uint8_fromregion(&region);
        if (hit_len == 0)
                return (DNS_R_FORMERR);
        isc_region_consume(&region, 2);         /* hit length + algorithm */
        key_len = uint16_fromregion(&region);
        if (key_len == 0)
                return (DNS_R_FORMERR);
        isc_region_consume(&region, 2);
        if (region.length < (unsigned) (hit_len + key_len))
                return (DNS_R_FORMERR);

        RETERR(isc_mem_tobuffer(target, rr.base, 4 + hit_len + key_len));
        isc_buffer_forward(source, 4 + hit_len + key_len);

        dns_decompress_setmethods(dctx, DNS_COMPRESS_NONE);
        while (isc_buffer_activelength(source) > 0) {
                dns_name_init(&name, NULL);
                RETERR(dns_name_fromwire(&name, source, dctx, options, target));
        }
        return (ISC_R_SUCCESS);
}

static inline isc_result_t
towire_hip(ARGS_TOWIRE) {
        isc_region_t region;

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

        UNUSED(cctx);

        dns_rdata_toregion(rdata, &region);
        return (isc_mem_tobuffer(target, region.base, region.length));
}
#endif  /* RDATA_GENERIC_HIP_5_C */