/*
 * ldnssec-utils
 *
 * Written in 2021 by Lucas
 *
 * To the extent possible under law, the author(s) have dedicated all
 * copyright and related and neighboring rights to this software to the
 * public domain worldwide. This software is distributed without any
 * warranty.
 *
 * You should have received a copy of the CC0 Public Domain Dedication
 * along with this software. If not, see
 * <http://creativecommons.org/publicdomain/zero/1.0/>.
 */

#include <err.h>

#include <ldns/ldns.h>

#include "util.h"

#define MINIMUM_LDNS_VERSION 	"1.7.1"
#define MINIMUM_LDNS_REVISION	((1<<16)|(7<<8)|(1))

ldns_lookup_table ldnssec_hashes[] = {
	/*
	 * Normative names from DS-IANA:
	 * https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml
	 */
	{ LDNS_SHA1, "SHA-1" },
	{ LDNS_SHA256, "SHA-256" },
	{ LDNS_HASH_GOST, "GOST R 34.11-94" },
	{ LDNS_SHA384, "SHA-384" },
	{ 0, NULL },
};

ldns_hash
ldnssec_get_hash_algorithm_by_name(const char *name)
{
	static ldns_lookup_table aliases[] = {
		{ LDNS_SHA1, "SHA1" },
		{ LDNS_SHA256, "SHA256" },
		{ LDNS_HASH_GOST, "GOST" },
		{ LDNS_SHA384, "SHA384" },
		{ 0, NULL },
	};
	ldns_lookup_table *lt;
	const char *errstr;
	long long n;

	lt = ldns_lookup_by_name(ldnssec_hashes, name);
	if (lt != NULL)
		return lt->id;
	lt = ldns_lookup_by_name(aliases, name);
	if (lt != NULL)
		return lt->id;

	n = strtonum(name, 0, UINT8_MAX, &errstr);
	if (errstr == NULL)
		return n;

	return 0;
}

void
fatal_check_minimum_ldns_revision(void)
{
	if (MINIMUM_LDNS_REVISION > LDNS_REVISION)
		errx(1, "ldns version should be greater or equal than "
		    MINIMUM_LDNS_VERSION "; got %s instead\n", ldns_version());
}