contrib/unbound/daemon/stats.c

   1 /*
   2  * daemon/stats.c - collect runtime performance indicators.
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file describes the data structure used to collect runtime performance
  40  * numbers. These 'statistics' may be of interest to the operator.
  41  */
  42 #include "config.h"
  43 #ifdef HAVE_TIME_H
  44 #include <time.h>
  45 #endif
  46 #include <sys/time.h>
  47 #include <sys/types.h>
  48 #include "daemon/stats.h"
  49 #include "daemon/worker.h"
  50 #include "daemon/daemon.h"
  51 #include "services/mesh.h"
  52 #include "services/outside_network.h"
  53 #include "services/listen_dnsport.h"
  54 #include "util/config_file.h"
  55 #include "util/tube.h"
  56 #include "util/timehist.h"
  57 #include "util/net_help.h"
  58 #include "validator/validator.h"
  59 #include "iterator/iterator.h"
  60 #include "sldns/sbuffer.h"
  61 #include "services/cache/rrset.h"
  62 #include "services/cache/infra.h"
  63 #include "services/authzone.h"
  64 #include "validator/val_kcache.h"
  65 #include "validator/val_neg.h"
  66 #ifdef CLIENT_SUBNET
  67 #include "edns-subnet/subnetmod.h"
  68 #endif
  69
  70 /** add timers and the values do not overflow or become negative */
  71 static void
  72 stats_timeval_add(long long* d_sec, long long* d_usec, long long add_sec, long long add_usec)
  73 {
  74 #ifndef S_SPLINT_S
  75         (*d_sec) += add_sec;
  76         (*d_usec) += add_usec;
  77         if((*d_usec) > 1000000) {
  78                 (*d_usec) -= 1000000;
  79                 (*d_sec)++;
  80         }
  81 #endif
  82 }
  83
  84 void server_stats_init(struct ub_server_stats* stats, struct config_file* cfg)
  85 {
  86         memset(stats, 0, sizeof(*stats));
  87         stats->extended = cfg->stat_extended;
  88 }
  89
  90 void server_stats_querymiss(struct ub_server_stats* stats, struct worker* worker)
  91 {
  92         stats->num_queries_missed_cache++;
  93         stats->sum_query_list_size += worker->env.mesh->all.count;
  94         if((long long)worker->env.mesh->all.count > stats->max_query_list_size)
  95                 stats->max_query_list_size = (long long)worker->env.mesh->all.count;
  96 }
  97
  98 void server_stats_prefetch(struct ub_server_stats* stats, struct worker* worker)
  99 {
 100         stats->num_queries_prefetch++;
 101         /* changes the query list size so account that, like a querymiss */
 102         stats->sum_query_list_size += worker->env.mesh->all.count;
 103         if((long long)worker->env.mesh->all.count > stats->max_query_list_size)
 104                 stats->max_query_list_size = (long long)worker->env.mesh->all.count;
 105 }
 106
 107 void server_stats_log(struct ub_server_stats* stats, struct worker* worker,
 108         int threadnum)
 109 {
 110         log_info("server stats for thread %d: %u queries, "
 111                 "%u answers from cache, %u recursions, %u prefetch, %u rejected by "
 112                 "ip ratelimiting",
 113                 threadnum, (unsigned)stats->num_queries,
 114                 (unsigned)(stats->num_queries -
 115                         stats->num_queries_missed_cache),
 116                 (unsigned)stats->num_queries_missed_cache,
 117                 (unsigned)stats->num_queries_prefetch,
 118                 (unsigned)stats->num_queries_ip_ratelimited);
 119         log_info("server stats for thread %d: requestlist max %u avg %g "
 120                 "exceeded %u jostled %u", threadnum,
 121                 (unsigned)stats->max_query_list_size,
 122                 (stats->num_queries_missed_cache+stats->num_queries_prefetch)?
 123                         (double)stats->sum_query_list_size/
 124                         (double)(stats->num_queries_missed_cache+
 125                         stats->num_queries_prefetch) : 0.0,
 126                 (unsigned)worker->env.mesh->stats_dropped,
 127                 (unsigned)worker->env.mesh->stats_jostled);
 128 }
 129
 130
 131 #ifdef CLIENT_SUBNET
 132 /** Set the EDNS Subnet stats. */
 133 static void
 134 set_subnet_stats(struct worker* worker, struct ub_server_stats* svr,
 135         int reset)
 136 {
 137         int m = modstack_find(&worker->env.mesh->mods, "subnet");
 138         struct subnet_env* sne;
 139         if(m == -1)
 140                 return;
 141         sne = (struct subnet_env*)worker->env.modinfo[m];
 142         if(reset && !worker->env.cfg->stat_cumulative) {
 143                 lock_rw_wrlock(&sne->biglock);
 144         } else {
 145                 lock_rw_rdlock(&sne->biglock);
 146         }
 147         svr->num_query_subnet = (long long)(sne->num_msg_nocache + sne->num_msg_cache);
 148         svr->num_query_subnet_cache = (long long)sne->num_msg_cache;
 149         if(reset && !worker->env.cfg->stat_cumulative) {
 150                 sne->num_msg_cache = 0;
 151                 sne->num_msg_nocache = 0;
 152         }
 153         lock_rw_unlock(&sne->biglock);
 154 }
 155 #endif /* CLIENT_SUBNET */
 156
 157 /** Set the neg cache stats. */
 158 static void
 159 set_neg_cache_stats(struct worker* worker, struct ub_server_stats* svr,
 160         int reset)
 161 {
 162         int m = modstack_find(&worker->env.mesh->mods, "validator");
 163         struct val_env* ve;
 164         struct val_neg_cache* neg;
 165         if(m == -1)
 166                 return;
 167         ve = (struct val_env*)worker->env.modinfo[m];
 168         if(!ve->neg_cache)
 169                 return;
 170         neg = ve->neg_cache;
 171         lock_basic_lock(&neg->lock);
 172         svr->num_neg_cache_noerror = (long long)neg->num_neg_cache_noerror;
 173         svr->num_neg_cache_nxdomain = (long long)neg->num_neg_cache_nxdomain;
 174         if(reset && !worker->env.cfg->stat_cumulative) {
 175                 neg->num_neg_cache_noerror = 0;
 176                 neg->num_neg_cache_nxdomain = 0;
 177         }
 178         lock_basic_unlock(&neg->lock);
 179 }
 180
 181 /** get rrsets bogus number from validator */
 182 static size_t
 183 get_rrset_bogus(struct worker* worker, int reset)
 184 {
 185         int m = modstack_find(&worker->env.mesh->mods, "validator");
 186         struct val_env* ve;
 187         size_t r;
 188         if(m == -1)
 189                 return 0;
 190         ve = (struct val_env*)worker->env.modinfo[m];
 191         lock_basic_lock(&ve->bogus_lock);
 192         r = ve->num_rrset_bogus;
 193         if(reset && !worker->env.cfg->stat_cumulative)
 194                 ve->num_rrset_bogus = 0;
 195         lock_basic_unlock(&ve->bogus_lock);
 196         return r;
 197 }
 198
 199 /** get number of ratelimited queries from iterator */
 200 static size_t
 201 get_queries_ratelimit(struct worker* worker, int reset)
 202 {
 203         int m = modstack_find(&worker->env.mesh->mods, "iterator");
 204         struct iter_env* ie;
 205         size_t r;
 206         if(m == -1)
 207                 return 0;
 208         ie = (struct iter_env*)worker->env.modinfo[m];
 209         lock_basic_lock(&ie->queries_ratelimit_lock);
 210         r = ie->num_queries_ratelimited;
 211         if(reset && !worker->env.cfg->stat_cumulative)
 212                 ie->num_queries_ratelimited = 0;
 213         lock_basic_unlock(&ie->queries_ratelimit_lock);
 214         return r;
 215 }
 216
 217 #ifdef USE_DNSCRYPT
 218 /** get the number of shared secret cache miss */
 219 static size_t
 220 get_dnscrypt_cache_miss(struct worker* worker, int reset)
 221 {
 222         size_t r;
 223         struct dnsc_env* de = worker->daemon->dnscenv;
 224         if(!de) return 0;
 225
 226         lock_basic_lock(&de->shared_secrets_cache_lock);
 227         r = de->num_query_dnscrypt_secret_missed_cache;
 228         if(reset && !worker->env.cfg->stat_cumulative)
 229                 de->num_query_dnscrypt_secret_missed_cache = 0;
 230         lock_basic_unlock(&de->shared_secrets_cache_lock);
 231         return r;
 232 }
 233
 234 /** get the number of replayed queries */
 235 static size_t
 236 get_dnscrypt_replay(struct worker* worker, int reset)
 237 {
 238         size_t r;
 239         struct dnsc_env* de = worker->daemon->dnscenv;
 240
 241         lock_basic_lock(&de->nonces_cache_lock);
 242         r = de->num_query_dnscrypt_replay;
 243         if(reset && !worker->env.cfg->stat_cumulative)
 244                 de->num_query_dnscrypt_replay = 0;
 245         lock_basic_unlock(&de->nonces_cache_lock);
 246         return r;
 247 }
 248 #endif /* USE_DNSCRYPT */
 249
 250 void
 251 server_stats_compile(struct worker* worker, struct ub_stats_info* s, int reset)
 252 {
 253         int i;
 254         struct listen_list* lp;
 255
 256         s->svr = worker->stats;
 257         s->mesh_num_states = (long long)worker->env.mesh->all.count;
 258         s->mesh_num_reply_states = (long long)worker->env.mesh->num_reply_states;
 259         s->mesh_jostled = (long long)worker->env.mesh->stats_jostled;
 260         s->mesh_dropped = (long long)worker->env.mesh->stats_dropped;
 261         s->mesh_replies_sent = (long long)worker->env.mesh->replies_sent;
 262         s->mesh_replies_sum_wait_sec = (long long)worker->env.mesh->replies_sum_wait.tv_sec;
 263         s->mesh_replies_sum_wait_usec = (long long)worker->env.mesh->replies_sum_wait.tv_usec;
 264         s->mesh_time_median = timehist_quartile(worker->env.mesh->histogram,
 265                 0.50);
 266
 267         /* add in the values from the mesh */
 268         s->svr.ans_secure += (long long)worker->env.mesh->ans_secure;
 269         s->svr.ans_bogus += (long long)worker->env.mesh->ans_bogus;
 270         s->svr.ans_rcode_nodata += (long long)worker->env.mesh->ans_nodata;
 271         for(i=0; i<16; i++)
 272                 s->svr.ans_rcode[i] += (long long)worker->env.mesh->ans_rcode[i];
 273         timehist_export(worker->env.mesh->histogram, s->svr.hist,
 274                 NUM_BUCKETS_HIST);
 275         /* values from outside network */
 276         s->svr.unwanted_replies = (long long)worker->back->unwanted_replies;
 277         s->svr.qtcp_outgoing = (long long)worker->back->num_tcp_outgoing;
 278
 279         /* get and reset validator rrset bogus number */
 280         s->svr.rrset_bogus = (long long)get_rrset_bogus(worker, reset);
 281
 282         /* get and reset iterator query ratelimit number */
 283         s->svr.queries_ratelimited = (long long)get_queries_ratelimit(worker, reset);
 284
 285         /* get cache sizes */
 286         s->svr.msg_cache_count = (long long)count_slabhash_entries(worker->env.msg_cache);
 287         s->svr.rrset_cache_count = (long long)count_slabhash_entries(&worker->env.rrset_cache->table);
 288         s->svr.infra_cache_count = (long long)count_slabhash_entries(worker->env.infra_cache->hosts);
 289         if(worker->env.key_cache)
 290                 s->svr.key_cache_count = (long long)count_slabhash_entries(worker->env.key_cache->slab);
 291         else    s->svr.key_cache_count = 0;
 292
 293 #ifdef USE_DNSCRYPT
 294         if(worker->daemon->dnscenv) {
 295                 s->svr.num_query_dnscrypt_secret_missed_cache =
 296                         (long long)get_dnscrypt_cache_miss(worker, reset);
 297                 s->svr.shared_secret_cache_count = (long long)count_slabhash_entries(
 298                         worker->daemon->dnscenv->shared_secrets_cache);
 299                 s->svr.nonce_cache_count = (long long)count_slabhash_entries(
 300                         worker->daemon->dnscenv->nonces_cache);
 301                 s->svr.num_query_dnscrypt_replay =
 302                         (long long)get_dnscrypt_replay(worker, reset);
 303         } else {
 304                 s->svr.num_query_dnscrypt_secret_missed_cache = 0;
 305                 s->svr.shared_secret_cache_count = 0;
 306                 s->svr.nonce_cache_count = 0;
 307                 s->svr.num_query_dnscrypt_replay = 0;
 308         }
 309 #else
 310         s->svr.num_query_dnscrypt_secret_missed_cache = 0;
 311         s->svr.shared_secret_cache_count = 0;
 312         s->svr.nonce_cache_count = 0;
 313         s->svr.num_query_dnscrypt_replay = 0;
 314 #endif /* USE_DNSCRYPT */
 315         if(worker->env.auth_zones) {
 316                 if(reset && !worker->env.cfg->stat_cumulative) {
 317                         lock_rw_wrlock(&worker->env.auth_zones->lock);
 318                 } else {
 319                         lock_rw_rdlock(&worker->env.auth_zones->lock);
 320                 }
 321                 s->svr.num_query_authzone_up = (long long)worker->env.
 322                         auth_zones->num_query_up;
 323                 s->svr.num_query_authzone_down = (long long)worker->env.
 324                         auth_zones->num_query_down;
 325                 if(reset && !worker->env.cfg->stat_cumulative) {
 326                         worker->env.auth_zones->num_query_up = 0;
 327                         worker->env.auth_zones->num_query_down = 0;
 328                 }
 329                 lock_rw_unlock(&worker->env.auth_zones->lock);
 330         }
 331
 332         /* Set neg cache usage numbers */
 333         set_neg_cache_stats(worker, &s->svr, reset);
 334 #ifdef CLIENT_SUBNET
 335         /* EDNS Subnet usage numbers */
 336         set_subnet_stats(worker, &s->svr, reset);
 337 #else
 338         s->svr.num_query_subnet = 0;
 339         s->svr.num_query_subnet_cache = 0;
 340 #endif
 341
 342         /* get tcp accept usage */
 343         s->svr.tcp_accept_usage = 0;
 344         for(lp = worker->front->cps; lp; lp = lp->next) {
 345                 if(lp->com->type == comm_tcp_accept)
 346                         s->svr.tcp_accept_usage += (long long)lp->com->cur_tcp_count;
 347         }
 348
 349         if(reset && !worker->env.cfg->stat_cumulative) {
 350                 worker_stats_clear(worker);
 351         }
 352 }
 353
 354 void server_stats_obtain(struct worker* worker, struct worker* who,
 355         struct ub_stats_info* s, int reset)
 356 {
 357         uint8_t *reply = NULL;
 358         uint32_t len = 0;
 359         if(worker == who) {
 360                 /* just fill it in */
 361                 server_stats_compile(worker, s, reset);
 362                 return;
 363         }
 364         /* communicate over tube */
 365         verbose(VERB_ALGO, "write stats cmd");
 366         if(reset)
 367                 worker_send_cmd(who, worker_cmd_stats);
 368         else    worker_send_cmd(who, worker_cmd_stats_noreset);
 369         verbose(VERB_ALGO, "wait for stats reply");
 370         if(!tube_read_msg(worker->cmd, &reply, &len, 0))
 371                 fatal_exit("failed to read stats over cmd channel");
 372         if(len != (uint32_t)sizeof(*s))
 373                 fatal_exit("stats on cmd channel wrong length %d %d",
 374                         (int)len, (int)sizeof(*s));
 375         memcpy(s, reply, (size_t)len);
 376         free(reply);
 377 }
 378
 379 void server_stats_reply(struct worker* worker, int reset)
 380 {
 381         struct ub_stats_info s;
 382         server_stats_compile(worker, &s, reset);
 383         verbose(VERB_ALGO, "write stats replymsg");
 384         if(!tube_write_msg(worker->daemon->workers[0]->cmd,
 385                 (uint8_t*)&s, sizeof(s), 0))
 386                 fatal_exit("could not write stat values over cmd channel");
 387 }
 388
 389 void server_stats_add(struct ub_stats_info* total, struct ub_stats_info* a)
 390 {
 391         total->svr.num_queries += a->svr.num_queries;
 392         total->svr.num_queries_ip_ratelimited += a->svr.num_queries_ip_ratelimited;
 393         total->svr.num_queries_missed_cache += a->svr.num_queries_missed_cache;
 394         total->svr.num_queries_prefetch += a->svr.num_queries_prefetch;
 395         total->svr.sum_query_list_size += a->svr.sum_query_list_size;
 396 #ifdef USE_DNSCRYPT
 397         total->svr.num_query_dnscrypt_crypted += a->svr.num_query_dnscrypt_crypted;
 398         total->svr.num_query_dnscrypt_cert += a->svr.num_query_dnscrypt_cert;
 399         total->svr.num_query_dnscrypt_cleartext += \
 400                 a->svr.num_query_dnscrypt_cleartext;
 401         total->svr.num_query_dnscrypt_crypted_malformed += \
 402                 a->svr.num_query_dnscrypt_crypted_malformed;
 403 #endif /* USE_DNSCRYPT */
 404         /* the max size reached is upped to higher of both */
 405         if(a->svr.max_query_list_size > total->svr.max_query_list_size)
 406                 total->svr.max_query_list_size = a->svr.max_query_list_size;
 407
 408         if(a->svr.extended) {
 409                 int i;
 410                 total->svr.qtype_big += a->svr.qtype_big;
 411                 total->svr.qclass_big += a->svr.qclass_big;
 412                 total->svr.qtcp += a->svr.qtcp;
 413                 total->svr.qtcp_outgoing += a->svr.qtcp_outgoing;
 414                 total->svr.qtls += a->svr.qtls;
 415                 total->svr.qipv6 += a->svr.qipv6;
 416                 total->svr.qbit_QR += a->svr.qbit_QR;
 417                 total->svr.qbit_AA += a->svr.qbit_AA;
 418                 total->svr.qbit_TC += a->svr.qbit_TC;
 419                 total->svr.qbit_RD += a->svr.qbit_RD;
 420                 total->svr.qbit_RA += a->svr.qbit_RA;
 421                 total->svr.qbit_Z += a->svr.qbit_Z;
 422                 total->svr.qbit_AD += a->svr.qbit_AD;
 423                 total->svr.qbit_CD += a->svr.qbit_CD;
 424                 total->svr.qEDNS += a->svr.qEDNS;
 425                 total->svr.qEDNS_DO += a->svr.qEDNS_DO;
 426                 total->svr.ans_rcode_nodata += a->svr.ans_rcode_nodata;
 427                 total->svr.zero_ttl_responses += a->svr.zero_ttl_responses;
 428                 total->svr.ans_secure += a->svr.ans_secure;
 429                 total->svr.ans_bogus += a->svr.ans_bogus;
 430                 total->svr.unwanted_replies += a->svr.unwanted_replies;
 431                 total->svr.unwanted_queries += a->svr.unwanted_queries;
 432                 total->svr.tcp_accept_usage += a->svr.tcp_accept_usage;
 433                 for(i=0; i<UB_STATS_QTYPE_NUM; i++)
 434                         total->svr.qtype[i] += a->svr.qtype[i];
 435                 for(i=0; i<UB_STATS_QCLASS_NUM; i++)
 436                         total->svr.qclass[i] += a->svr.qclass[i];
 437                 for(i=0; i<UB_STATS_OPCODE_NUM; i++)
 438                         total->svr.qopcode[i] += a->svr.qopcode[i];
 439                 for(i=0; i<UB_STATS_RCODE_NUM; i++)
 440                         total->svr.ans_rcode[i] += a->svr.ans_rcode[i];
 441                 for(i=0; i<NUM_BUCKETS_HIST; i++)
 442                         total->svr.hist[i] += a->svr.hist[i];
 443         }
 444
 445         total->mesh_num_states += a->mesh_num_states;
 446         total->mesh_num_reply_states += a->mesh_num_reply_states;
 447         total->mesh_jostled += a->mesh_jostled;
 448         total->mesh_dropped += a->mesh_dropped;
 449         total->mesh_replies_sent += a->mesh_replies_sent;
 450         stats_timeval_add(&total->mesh_replies_sum_wait_sec, &total->mesh_replies_sum_wait_usec, a->mesh_replies_sum_wait_sec, a->mesh_replies_sum_wait_usec);
 451         /* the medians are averaged together, this is not as accurate as
 452          * taking the median over all of the data, but is good and fast
 453          * added up here, division later*/
 454         total->mesh_time_median += a->mesh_time_median;
 455 }
 456
 457 void server_stats_insquery(struct ub_server_stats* stats, struct comm_point* c,
 458         uint16_t qtype, uint16_t qclass, struct edns_data* edns,
 459         struct comm_reply* repinfo)
 460 {
 461         uint16_t flags = sldns_buffer_read_u16_at(c->buffer, 2);
 462         if(qtype < UB_STATS_QTYPE_NUM)
 463                 stats->qtype[qtype]++;
 464         else    stats->qtype_big++;
 465         if(qclass < UB_STATS_QCLASS_NUM)
 466                 stats->qclass[qclass]++;
 467         else    stats->qclass_big++;
 468         stats->qopcode[ LDNS_OPCODE_WIRE(sldns_buffer_begin(c->buffer)) ]++;
 469         if(c->type != comm_udp) {
 470                 stats->qtcp++;
 471                 if(c->ssl != NULL)
 472                         stats->qtls++;
 473         }
 474         if(repinfo && addr_is_ip6(&repinfo->addr, repinfo->addrlen))
 475                 stats->qipv6++;
 476         if( (flags&BIT_QR) )
 477                 stats->qbit_QR++;
 478         if( (flags&BIT_AA) )
 479                 stats->qbit_AA++;
 480         if( (flags&BIT_TC) )
 481                 stats->qbit_TC++;
 482         if( (flags&BIT_RD) )
 483                 stats->qbit_RD++;
 484         if( (flags&BIT_RA) )
 485                 stats->qbit_RA++;
 486         if( (flags&BIT_Z) )
 487                 stats->qbit_Z++;
 488         if( (flags&BIT_AD) )
 489                 stats->qbit_AD++;
 490         if( (flags&BIT_CD) )
 491                 stats->qbit_CD++;
 492         if(edns->edns_present) {
 493                 stats->qEDNS++;
 494                 if( (edns->bits & EDNS_DO) )
 495                         stats->qEDNS_DO++;
 496         }
 497 }
 498
 499 void server_stats_insrcode(struct ub_server_stats* stats, sldns_buffer* buf)
 500 {
 501         if(stats->extended && sldns_buffer_limit(buf) != 0) {
 502                 int r = (int)LDNS_RCODE_WIRE( sldns_buffer_begin(buf) );
 503                 stats->ans_rcode[r] ++;
 504                 if(r == 0 && LDNS_ANCOUNT( sldns_buffer_begin(buf) ) == 0)
 505                         stats->ans_rcode_nodata ++;
 506         }
 507 }