/*      $OpenBSD: resolver.h,v 1.17 2019/12/18 09:18:27 florian Exp $   */

/*
 * Copyright (c) 2018 Florian Obser <florian@openbsd.org>
 * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
 *
 * 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
 */

enum uw_resolver_state {
        DEAD,
        UNKNOWN,
        RESOLVING,
        VALIDATING
};

static const char * const       uw_resolver_state_str[] = {
        "dead",
        "unknown",
        "resolving",
        "validating"
};

static const int64_t            histogram_limits[] = {
        10,
        20,
        40,
        60,
        80,
        100,
        200,
        400,
        600,
        800,
        1000,
        INT64_MAX,
};

struct ctl_resolver_info {
        enum uw_resolver_state   state;
        enum uw_resolver_type    type;
        int64_t                  median;
        int64_t                  histogram[nitems(histogram_limits)];
        int64_t                  latest_histogram[nitems(histogram_limits)];
};

struct ctl_forwarder_info {
        char             ip[INET6_ADDRSTRLEN];
        uint32_t         if_index;
        int              src;
};

struct ctl_mem_info {
        size_t           msg_cache_used;
        size_t           msg_cache_max;
        size_t           rrset_cache_used;
        size_t           rrset_cache_max;
        size_t           key_cache_used;
        size_t           key_cache_max;
        size_t           neg_cache_used;
        size_t           neg_cache_max;
};

void     resolver(int, int);
int      resolver_imsg_compose_main(int, pid_t, void *, uint16_t);
int      resolver_imsg_compose_frontend(int, pid_t, void *, uint16_t);