/*
* testcode/unitinfra.c - unit test for infra cache.
*
* Copyright (c) 2025, NLnet Labs. All rights reserved.
*
* This software is open source.
*
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* modification, are permitted provided that the following conditions
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*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
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* be used to endorse or promote products derived from this software without
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/
/**
* \file
* Tests the infra functionality.
*/

#include "config.h"
#include "testcode/unitmain.h"
#include "iterator/iterator.h"
#include "services/cache/infra.h"
#include "util/config_file.h"
#include "util/net_help.h"

/* lookup and get key and data structs easily */
static struct infra_data* infra_lookup_host(struct infra_cache* infra,
       struct sockaddr_storage* addr, socklen_t addrlen, uint8_t* zone,
       size_t zonelen, int wr, time_t now, struct infra_key** k)
{
       struct infra_data* d;
       struct lruhash_entry* e = infra_lookup_nottl(infra, addr, addrlen,
               zone, zonelen, wr);
       if(!e) return NULL;
       d = (struct infra_data*)e->data;
       if(d->ttl < now) {
               lock_rw_unlock(&e->lock);
               return NULL;
       }
       *k = (struct infra_key*)e->key;
       return d;
}

static void test_keep_probing(struct infra_cache* slab,
       struct config_file* cfg, struct sockaddr_storage one, socklen_t onelen,
       uint8_t* zone, size_t zonelen, time_t *now, int keep_probing,
       int rtt_max_timeout)
{
       uint8_t edns_lame;
       int vs, to, lame, dnsseclame, reclame, probedelay;
       struct infra_key* k;
       struct infra_data* d;

       /* configure */
       cfg->infra_cache_max_rtt = rtt_max_timeout;
       config_apply_max_rtt(rtt_max_timeout);
       slab->infra_keep_probing = keep_probing;

       /* expired previous entry */
       *now += cfg->host_ttl + 10;
       unit_assert( infra_host(slab, &one, onelen, zone, zonelen,
                       *now, &vs, &edns_lame, &to) );

       /* simulate timeouts until the USEFUL_SERVER_TOP_TIMEOUT is reached */
       while(to < USEFUL_SERVER_TOP_TIMEOUT) {
               unit_assert( infra_rtt_update(slab, &one, onelen, zone, zonelen,
                       LDNS_RR_TYPE_A, -1, to, *now) );
               unit_assert( infra_host(slab, &one, onelen, zone, zonelen,
                       *now, &vs, &edns_lame, &to) );
               unit_assert( vs == 0 && to <= USEFUL_SERVER_TOP_TIMEOUT && edns_lame == 0 );
       }
       unit_assert( vs == 0 && to == USEFUL_SERVER_TOP_TIMEOUT && edns_lame == 0 );

       /* don't let the record expire */
       unit_assert( (d=infra_lookup_host(slab, &one, onelen, zone, zonelen, 0, *now, &k)) );
       unit_assert( d->timeout_A >= TIMEOUT_COUNT_MAX );
       unit_assert( d->probedelay > 0 );
       probedelay = d->probedelay;
       lock_rw_unlock(&k->entry.lock);
       cfg->host_ttl = cfg->host_ttl + *now < probedelay
               ?cfg->host_ttl :probedelay + 10;

       /* advance time and check that probing is as expected; we already had a
        * lot of A timeouts (checked above). */
       *now = probedelay;
       unit_assert( infra_get_lame_rtt(slab, &one, onelen, zone, zonelen,
               LDNS_RR_TYPE_A, &lame, &dnsseclame, &reclame, &to, *now) );
       unit_assert( lame == 0 && dnsseclame == 0 && reclame == 0
               && to == keep_probing ?still_useful_timeout() :USEFUL_SERVER_TOP_TIMEOUT);
}

/** test host cache */
void infra_test(void)
{
       struct sockaddr_storage one;
       socklen_t onelen;
       uint8_t* zone = (uint8_t*)"\007example\003com\000";
       size_t zonelen = 13;
       struct infra_cache* slab;
       struct config_file* cfg = config_create();
       time_t now = 0;
       uint8_t edns_lame;
       int vs, to;
       struct infra_key* k;
       struct infra_data* d;
       int init = UNKNOWN_SERVER_NICENESS;
       int default_max_rtt = USEFUL_SERVER_TOP_TIMEOUT;

       unit_show_feature("infra cache");
       unit_assert(ipstrtoaddr("127.0.0.1", 53, &one, &onelen));

       slab = infra_create(cfg);
       /* insert new record */
       unit_assert( infra_host(slab, &one, onelen, zone, zonelen, now,
               &vs, &edns_lame, &to) );
       unit_assert( vs == 0 && to == init && edns_lame == 0 );

       /* simulate no answer */
       unit_assert( infra_rtt_update(slab, &one, onelen, zone, zonelen, LDNS_RR_TYPE_A, -1, init, now) );
       unit_assert( infra_host(slab, &one, onelen, zone, zonelen,
                       now, &vs, &edns_lame, &to) );
       unit_assert( vs == 0 && to == init*2 && edns_lame == 0 );

       /* simulate EDNS lame */
       unit_assert( infra_edns_update(slab, &one, onelen, zone, zonelen, -1, now) );
       unit_assert( infra_host(slab, &one, onelen, zone, zonelen,
                       now, &vs, &edns_lame, &to) );
       unit_assert( vs == -1 && to == init*2  && edns_lame == 1);

       /* simulate cache expiry */
       now += cfg->host_ttl + 10;
       unit_assert( infra_host(slab, &one, onelen, zone, zonelen,
                       now, &vs, &edns_lame, &to) );
       unit_assert( vs == 0 && to == init && edns_lame == 0 );

       /* simulate no lame answer */
       unit_assert( infra_set_lame(slab, &one, onelen,
               zone, zonelen,  now, 0, 0, LDNS_RR_TYPE_A) );
       unit_assert( (d=infra_lookup_host(slab, &one, onelen, zone, zonelen, 0, now, &k)) );
       unit_assert( d->ttl == now+cfg->host_ttl );
       unit_assert( d->edns_version == 0 );
       unit_assert(!d->isdnsseclame && !d->rec_lame && d->lame_type_A &&
               !d->lame_other);
       lock_rw_unlock(&k->entry.lock);

       /* test merge of data */
       unit_assert( infra_set_lame(slab, &one, onelen,
               zone, zonelen,  now, 0, 0, LDNS_RR_TYPE_AAAA) );
       unit_assert( (d=infra_lookup_host(slab, &one, onelen, zone, zonelen, 0, now, &k)) );
       unit_assert(!d->isdnsseclame && !d->rec_lame && d->lame_type_A &&
               d->lame_other);
       lock_rw_unlock(&k->entry.lock);

       /* test that noEDNS cannot overwrite known-yesEDNS */
       now += cfg->host_ttl + 10;
       unit_assert( infra_host(slab, &one, onelen, zone, zonelen,
                       now, &vs, &edns_lame, &to) );
       unit_assert( vs == 0 && to == init && edns_lame == 0 );

       unit_assert( infra_edns_update(slab, &one, onelen, zone, zonelen, 0, now) );
       unit_assert( infra_host(slab, &one, onelen, zone, zonelen,
                       now, &vs, &edns_lame, &to) );
       unit_assert( vs == 0 && to == init && edns_lame == 1 );

       unit_assert( infra_edns_update(slab, &one, onelen, zone, zonelen, -1, now) );
       unit_assert( infra_host(slab, &one, onelen, zone, zonelen,
                       now, &vs, &edns_lame, &to) );
       unit_assert( vs == 0 && to == init && edns_lame == 1 );

       unit_show_feature("infra cache probing (keep-probing off, default infra-cache-max-rtt)");
       test_keep_probing(slab, cfg, one, onelen, zone, zonelen, &now, 0, default_max_rtt);

       unit_show_feature("infra cache probing (keep-probing on,  default infra-cache-max-rtt)");
       test_keep_probing(slab, cfg, one, onelen, zone, zonelen, &now, 1, default_max_rtt);

       unit_show_feature("infra cache probing (keep-probing off, low infra-cache-max-rtt)");
       test_keep_probing(slab, cfg, one, onelen, zone, zonelen, &now, 0, 3000);

       unit_show_feature("infra cache probing (keep-probing on,  low infra-cache-max-rtt)");
       test_keep_probing(slab, cfg, one, onelen, zone, zonelen, &now, 1, 3000);

       /* Re-apply defaults for other unit tests that follow */
       config_apply_max_rtt(default_max_rtt);

       infra_delete(slab);
       config_delete(cfg);
}

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