contrib/unbound/smallapp/unbound-control.c

   1 /*
   2  * checkconf/unbound-control.c - remote control utility for unbound.
   3  *
   4  * Copyright (c) 2008, 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  * The remote control utility contacts the unbound server over ssl and
  40  * sends the command, receives the answer, and displays the result
  41  * from the commandline.
  42  */
  43
  44 #include "config.h"
  45 #ifdef HAVE_GETOPT_H
  46 #include <getopt.h>
  47 #endif
  48 #ifdef HAVE_OPENSSL_SSL_H
  49 #include <openssl/ssl.h>
  50 #endif
  51 #ifdef HAVE_OPENSSL_ERR_H
  52 #include <openssl/err.h>
  53 #endif
  54 #ifdef HAVE_OPENSSL_RAND_H
  55 #include <openssl/rand.h>
  56 #endif
  57 #include "util/log.h"
  58 #include "util/config_file.h"
  59 #include "util/locks.h"
  60 #include "util/net_help.h"
  61 #include "util/shm_side/shm_main.h"
  62 #include "daemon/stats.h"
  63 #include "sldns/wire2str.h"
  64 #include "sldns/pkthdr.h"
  65
  66 #ifdef HAVE_SYS_IPC_H
  67 #include "sys/ipc.h"
  68 #endif
  69 #ifdef HAVE_SYS_SHM_H
  70 #include "sys/shm.h"
  71 #endif
  72 #ifdef HAVE_SYS_UN_H
  73 #include <sys/un.h>
  74 #endif
  75
  76 /** Give unbound-control usage, and exit (1). */
  77 static void
  78 usage(void)
  79 {
  80         printf("Usage:  local-unbound-control [options] command\n");
  81         printf("        Remote control utility for unbound server.\n");
  82         printf("Options:\n");
  83         printf("  -c file       config file, default is %s\n", CONFIGFILE);
  84         printf("  -s ip[@port]  server address, if omitted config is used.\n");
  85         printf("  -q            quiet (don't print anything if it works ok).\n");
  86         printf("  -h            show this usage help.\n");
  87         printf("Commands:\n");
  88         printf("  start                         start server; runs unbound(8)\n");
  89         printf("  stop                          stops the server\n");
  90         printf("  reload                        reloads the server\n");
  91         printf("                                (this flushes data, stats, requestlist)\n");
  92         printf("  stats                         print statistics\n");
  93         printf("  stats_noreset                 peek at statistics\n");
  94 #ifdef HAVE_SHMGET
  95         printf("  stats_shm                     print statistics using shm\n");
  96 #endif
  97         printf("  status                        display status of server\n");
  98         printf("  verbosity <number>            change logging detail\n");
  99         printf("  log_reopen                    close and open the logfile\n");
 100         printf("  local_zone <name> <type>      add new local zone\n");
 101         printf("  local_zone_remove <name>      remove local zone and its contents\n");
 102         printf("  local_data <RR data...>       add local data, for example\n");
 103         printf("                                local_data www.example.com A 192.0.2.1\n");
 104         printf("  local_data_remove <name>      remove local RR data from name\n");
 105         printf("  local_zones, local_zones_remove, local_datas, local_datas_remove\n");
 106         printf("                                same, but read list from stdin\n");
 107         printf("                                (one entry per line).\n");
 108         printf("  dump_cache                    print cache to stdout\n");
 109         printf("  load_cache                    load cache from stdin\n");
 110         printf("  lookup <name>                 print nameservers for name\n");
 111         printf("  flush <name>                  flushes common types for name from cache\n");
 112         printf("                                types:  A, AAAA, MX, PTR, NS,\n");
 113         printf("                                        SOA, CNAME, DNAME, SRV, NAPTR\n");
 114         printf("  flush_type <name> <type>      flush name, type from cache\n");
 115         printf("  flush_zone <name>             flush everything at or under name\n");
 116         printf("                                from rr and dnssec caches\n");
 117         printf("  flush_bogus                   flush all bogus data\n");
 118         printf("  flush_negative                flush all negative data\n");
 119         printf("  flush_stats                   flush statistics, make zero\n");
 120         printf("  flush_requestlist             drop queries that are worked on\n");
 121         printf("  dump_requestlist              show what is worked on by first thread\n");
 122         printf("  flush_infra [all | ip]        remove ping, edns for one IP or all\n");
 123         printf("  dump_infra                    show ping and edns entries\n");
 124         printf("  set_option opt: val           set option to value, no reload\n");
 125         printf("  get_option opt                get option value\n");
 126         printf("  list_stubs                    list stub-zones and root hints in use\n");
 127         printf("  list_forwards                 list forward-zones in use\n");
 128         printf("  list_insecure                 list domain-insecure zones\n");
 129         printf("  list_local_zones              list local-zones in use\n");
 130         printf("  list_local_data               list local-data RRs in use\n");
 131         printf("  insecure_add zone             add domain-insecure zone\n");
 132         printf("  insecure_remove zone          remove domain-insecure zone\n");
 133         printf("  forward_add [+i] zone addr..  add forward-zone with servers\n");
 134         printf("  forward_remove [+i] zone      remove forward zone\n");
 135         printf("  stub_add [+ip] zone addr..    add stub-zone with servers\n");
 136         printf("  stub_remove [+i] zone         remove stub zone\n");
 137         printf("                +i              also do dnssec insecure point\n");
 138         printf("                +p              set stub to use priming\n");
 139         printf("  forward [off | addr ...]      without arg show forward setup\n");
 140         printf("                                or off to turn off root forwarding\n");
 141         printf("                                or give list of ip addresses\n");
 142         printf("  ratelimit_list [+a]           list ratelimited domains\n");
 143         printf("  ip_ratelimit_list [+a]        list ratelimited ip addresses\n");
 144         printf("                +a              list all, also not ratelimited\n");
 145         printf("  list_auth_zones               list auth zones\n");
 146         printf("  view_list_local_zones view    list local-zones in view\n");
 147         printf("  view_list_local_data  view    list local-data RRs in view\n");
 148         printf("  view_local_zone view name type        add local-zone in view\n");
 149         printf("  view_local_zone_remove view name      remove local-zone in view\n");
 150         printf("  view_local_data view RR...            add local-data in view\n");
 151         printf("  view_local_data_remove view name      remove local-data in view\n");
 152         printf("Version %s\n", PACKAGE_VERSION);
 153         printf("BSD licensed, see LICENSE in source package for details.\n");
 154         printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
 155         exit(1);
 156 }
 157
 158 #ifdef HAVE_SHMGET
 159 /** what to put on statistics lines between var and value, ": " or "=" */
 160 #define SQ "="
 161 /** if true, inhibits a lot of =0 lines from the stats output */
 162 static const int inhibit_zero = 1;
 163 /** divide sum of timers to get average */
 164 static void
 165 timeval_divide(struct timeval* avg, const struct timeval* sum, long long d)
 166 {
 167 #ifndef S_SPLINT_S
 168         size_t leftover;
 169         if(d == 0) {
 170                 avg->tv_sec = 0;
 171                 avg->tv_usec = 0;
 172                 return;
 173         }
 174         avg->tv_sec = sum->tv_sec / d;
 175         avg->tv_usec = sum->tv_usec / d;
 176         /* handle fraction from seconds divide */
 177         leftover = sum->tv_sec - avg->tv_sec*d;
 178         avg->tv_usec += (leftover*1000000)/d;
 179 #endif
 180 }
 181
 182 /** print unsigned long stats value */
 183 #define PR_UL_NM(str, var) printf("%s."str SQ"%lu\n", nm, (unsigned long)(var));
 184 #define PR_UL(str, var) printf(str SQ"%lu\n", (unsigned long)(var));
 185 #define PR_UL_SUB(str, nm, var) printf(str".%s"SQ"%lu\n", nm, (unsigned long)(var));
 186 #define PR_TIMEVAL(str, var) printf(str SQ ARG_LL "d.%6.6d\n", \
 187         (long long)var.tv_sec, (int)var.tv_usec);
 188 #define PR_STATSTIME(str, var) printf(str SQ ARG_LL "d.%6.6d\n", \
 189         (long long)var ## _sec, (int)var ## _usec);
 190 #define PR_LL(str, var) printf(str SQ ARG_LL"d\n", (long long)(var));
 191
 192 /** print stat block */
 193 static void pr_stats(const char* nm, struct ub_stats_info* s)
 194 {
 195         struct timeval sumwait, avg;
 196         PR_UL_NM("num.queries", s->svr.num_queries);
 197         PR_UL_NM("num.queries_ip_ratelimited",
 198                 s->svr.num_queries_ip_ratelimited);
 199         PR_UL_NM("num.cachehits",
 200                 s->svr.num_queries - s->svr.num_queries_missed_cache);
 201         PR_UL_NM("num.cachemiss", s->svr.num_queries_missed_cache);
 202         PR_UL_NM("num.prefetch", s->svr.num_queries_prefetch);
 203         PR_UL_NM("num.zero_ttl", s->svr.zero_ttl_responses);
 204         PR_UL_NM("num.recursivereplies", s->mesh_replies_sent);
 205 #ifdef USE_DNSCRYPT
 206     PR_UL_NM("num.dnscrypt.crypted", s->svr.num_query_dnscrypt_crypted);
 207     PR_UL_NM("num.dnscrypt.cert", s->svr.num_query_dnscrypt_cert);
 208     PR_UL_NM("num.dnscrypt.cleartext", s->svr.num_query_dnscrypt_cleartext);
 209     PR_UL_NM("num.dnscrypt.malformed",
 210              s->svr.num_query_dnscrypt_crypted_malformed);
 211 #endif /* USE_DNSCRYPT */
 212         printf("%s.requestlist.avg"SQ"%g\n", nm,
 213                 (s->svr.num_queries_missed_cache+s->svr.num_queries_prefetch)?
 214                         (double)s->svr.sum_query_list_size/
 215                         (double)(s->svr.num_queries_missed_cache+
 216                         s->svr.num_queries_prefetch) : 0.0);
 217         PR_UL_NM("requestlist.max", s->svr.max_query_list_size);
 218         PR_UL_NM("requestlist.overwritten", s->mesh_jostled);
 219         PR_UL_NM("requestlist.exceeded", s->mesh_dropped);
 220         PR_UL_NM("requestlist.current.all", s->mesh_num_states);
 221         PR_UL_NM("requestlist.current.user", s->mesh_num_reply_states);
 222 #ifndef S_SPLINT_S
 223         sumwait.tv_sec = s->mesh_replies_sum_wait_sec;
 224         sumwait.tv_usec = s->mesh_replies_sum_wait_usec;
 225 #endif
 226         timeval_divide(&avg, &sumwait, s->mesh_replies_sent);
 227         printf("%s.", nm);
 228         PR_TIMEVAL("recursion.time.avg", avg);
 229         printf("%s.recursion.time.median"SQ"%g\n", nm, s->mesh_time_median);
 230         PR_UL_NM("tcpusage", s->svr.tcp_accept_usage);
 231 }
 232
 233 /** print uptime */
 234 static void print_uptime(struct ub_shm_stat_info* shm_stat)
 235 {
 236         PR_STATSTIME("time.now", shm_stat->time.now);
 237         PR_STATSTIME("time.up", shm_stat->time.up);
 238         PR_STATSTIME("time.elapsed", shm_stat->time.elapsed);
 239 }
 240
 241 /** print memory usage */
 242 static void print_mem(struct ub_shm_stat_info* shm_stat)
 243 {
 244         PR_LL("mem.cache.rrset", shm_stat->mem.rrset);
 245         PR_LL("mem.cache.message", shm_stat->mem.msg);
 246         PR_LL("mem.mod.iterator", shm_stat->mem.iter);
 247         PR_LL("mem.mod.validator", shm_stat->mem.val);
 248         PR_LL("mem.mod.respip", shm_stat->mem.respip);
 249 #ifdef CLIENT_SUBNET
 250         PR_LL("mem.mod.subnet", shm_stat->mem.subnet);
 251 #endif
 252 #ifdef USE_IPSECMOD
 253         PR_LL("mem.mod.ipsecmod", shm_stat->mem.ipsecmod);
 254 #endif
 255 #ifdef USE_DNSCRYPT
 256         PR_LL("mem.cache.dnscrypt_shared_secret",
 257                 shm_stat->mem.dnscrypt_shared_secret);
 258         PR_LL("mem.cache.dnscrypt_nonce",
 259                 shm_stat->mem.dnscrypt_nonce);
 260 #endif
 261 }
 262
 263 /** print histogram */
 264 static void print_hist(struct ub_stats_info* s)
 265 {
 266         struct timehist* hist;
 267         size_t i;
 268         hist = timehist_setup();
 269         if(!hist)
 270                 fatal_exit("out of memory");
 271         timehist_import(hist, s->svr.hist, NUM_BUCKETS_HIST);
 272         for(i=0; i<hist->num; i++) {
 273                 printf("histogram.%6.6d.%6.6d.to.%6.6d.%6.6d=%lu\n",
 274                         (int)hist->buckets[i].lower.tv_sec,
 275                         (int)hist->buckets[i].lower.tv_usec,
 276                         (int)hist->buckets[i].upper.tv_sec,
 277                         (int)hist->buckets[i].upper.tv_usec,
 278                         (unsigned long)hist->buckets[i].count);
 279         }
 280         timehist_delete(hist);
 281 }
 282
 283 /** print extended */
 284 static void print_extended(struct ub_stats_info* s)
 285 {
 286         int i;
 287         char nm[16];
 288
 289         /* TYPE */
 290         for(i=0; i<UB_STATS_QTYPE_NUM; i++) {
 291                 if(inhibit_zero && s->svr.qtype[i] == 0)
 292                         continue;
 293                 sldns_wire2str_type_buf((uint16_t)i, nm, sizeof(nm));
 294                 PR_UL_SUB("num.query.type", nm, s->svr.qtype[i]);
 295         }
 296         if(!inhibit_zero || s->svr.qtype_big) {
 297                 PR_UL("num.query.type.other", s->svr.qtype_big);
 298         }
 299
 300         /* CLASS */
 301         for(i=0; i<UB_STATS_QCLASS_NUM; i++) {
 302                 if(inhibit_zero && s->svr.qclass[i] == 0)
 303                         continue;
 304                 sldns_wire2str_class_buf((uint16_t)i, nm, sizeof(nm));
 305                 PR_UL_SUB("num.query.class", nm, s->svr.qclass[i]);
 306         }
 307         if(!inhibit_zero || s->svr.qclass_big) {
 308                 PR_UL("num.query.class.other", s->svr.qclass_big);
 309         }
 310
 311         /* OPCODE */
 312         for(i=0; i<UB_STATS_OPCODE_NUM; i++) {
 313                 if(inhibit_zero && s->svr.qopcode[i] == 0)
 314                         continue;
 315                 sldns_wire2str_opcode_buf(i, nm, sizeof(nm));
 316                 PR_UL_SUB("num.query.opcode", nm, s->svr.qopcode[i]);
 317         }
 318
 319         /* transport */
 320         PR_UL("num.query.tcp", s->svr.qtcp);
 321         PR_UL("num.query.tcpout", s->svr.qtcp_outgoing);
 322         PR_UL("num.query.ipv6", s->svr.qipv6);
 323
 324         /* flags */
 325         PR_UL("num.query.flags.QR", s->svr.qbit_QR);
 326         PR_UL("num.query.flags.AA", s->svr.qbit_AA);
 327         PR_UL("num.query.flags.TC", s->svr.qbit_TC);
 328         PR_UL("num.query.flags.RD", s->svr.qbit_RD);
 329         PR_UL("num.query.flags.RA", s->svr.qbit_RA);
 330         PR_UL("num.query.flags.Z", s->svr.qbit_Z);
 331         PR_UL("num.query.flags.AD", s->svr.qbit_AD);
 332         PR_UL("num.query.flags.CD", s->svr.qbit_CD);
 333         PR_UL("num.query.edns.present", s->svr.qEDNS);
 334         PR_UL("num.query.edns.DO", s->svr.qEDNS_DO);
 335
 336         /* RCODE */
 337         for(i=0; i<UB_STATS_RCODE_NUM; i++) {
 338                 /* Always include RCODEs 0-5 */
 339                 if(inhibit_zero && i > LDNS_RCODE_REFUSED && s->svr.ans_rcode[i] == 0)
 340                         continue;
 341                 sldns_wire2str_rcode_buf(i, nm, sizeof(nm));
 342                 PR_UL_SUB("num.answer.rcode", nm, s->svr.ans_rcode[i]);
 343         }
 344         if(!inhibit_zero || s->svr.ans_rcode_nodata) {
 345                 PR_UL("num.answer.rcode.nodata", s->svr.ans_rcode_nodata);
 346         }
 347         /* iteration */
 348         PR_UL("num.query.ratelimited", s->svr.queries_ratelimited);
 349         /* validation */
 350         PR_UL("num.answer.secure", s->svr.ans_secure);
 351         PR_UL("num.answer.bogus", s->svr.ans_bogus);
 352         PR_UL("num.rrset.bogus", s->svr.rrset_bogus);
 353         PR_UL("num.query.aggressive.NOERROR", s->svr.num_neg_cache_noerror);
 354         PR_UL("num.query.aggressive.NXDOMAIN", s->svr.num_neg_cache_nxdomain);
 355         /* threat detection */
 356         PR_UL("unwanted.queries", s->svr.unwanted_queries);
 357         PR_UL("unwanted.replies", s->svr.unwanted_replies);
 358         /* cache counts */
 359         PR_UL("msg.cache.count", s->svr.msg_cache_count);
 360         PR_UL("rrset.cache.count", s->svr.rrset_cache_count);
 361         PR_UL("infra.cache.count", s->svr.infra_cache_count);
 362         PR_UL("key.cache.count", s->svr.key_cache_count);
 363 #ifdef USE_DNSCRYPT
 364         PR_UL("dnscrypt_shared_secret.cache.count",
 365                          s->svr.shared_secret_cache_count);
 366         PR_UL("num.query.dnscrypt.shared_secret.cachemiss",
 367                          s->svr.num_query_dnscrypt_secret_missed_cache);
 368         PR_UL("dnscrypt_nonce.cache.count", s->svr.nonce_cache_count);
 369         PR_UL("num.query.dnscrypt.replay",
 370                          s->svr.num_query_dnscrypt_replay);
 371 #endif /* USE_DNSCRYPT */
 372         PR_UL("num.query.authzone.up", s->svr.num_query_authzone_up);
 373         PR_UL("num.query.authzone.down", s->svr.num_query_authzone_down);
 374 }
 375
 376 /** print statistics out of memory structures */
 377 static void do_stats_shm(struct config_file* cfg, struct ub_stats_info* stats,
 378         struct ub_shm_stat_info* shm_stat)
 379 {
 380         int i;
 381         char nm[32];
 382         for(i=0; i<cfg->num_threads; i++) {
 383                 snprintf(nm, sizeof(nm), "thread%d", i);
 384                 pr_stats(nm, &stats[i+1]);
 385         }
 386         pr_stats("total", &stats[0]);
 387         print_uptime(shm_stat);
 388         if(cfg->stat_extended) {
 389                 print_mem(shm_stat);
 390                 print_hist(stats);
 391                 print_extended(stats);
 392         }
 393 }
 394 #endif /* HAVE_SHMGET */
 395
 396 /** print statistics from shm memory segment */
 397 static void print_stats_shm(const char* cfgfile)
 398 {
 399 #ifdef HAVE_SHMGET
 400         struct config_file* cfg;
 401         struct ub_stats_info* stats;
 402         struct ub_shm_stat_info* shm_stat;
 403         int id_ctl, id_arr;
 404         /* read config */
 405         if(!(cfg = config_create()))
 406                 fatal_exit("out of memory");
 407         if(!config_read(cfg, cfgfile, NULL))
 408                 fatal_exit("could not read config file");
 409         /* get shm segments */
 410         id_ctl = shmget(cfg->shm_key, sizeof(int), SHM_R|SHM_W);
 411         if(id_ctl == -1) {
 412                 fatal_exit("shmget(%d): %s", cfg->shm_key, strerror(errno));
 413         }
 414         id_arr = shmget(cfg->shm_key+1, sizeof(int), SHM_R|SHM_W);
 415         if(id_arr == -1) {
 416                 fatal_exit("shmget(%d): %s", cfg->shm_key+1, strerror(errno));
 417         }
 418         shm_stat = (struct ub_shm_stat_info*)shmat(id_ctl, NULL, 0);
 419         if(shm_stat == (void*)-1) {
 420                 fatal_exit("shmat(%d): %s", id_ctl, strerror(errno));
 421         }
 422         stats = (struct ub_stats_info*)shmat(id_arr, NULL, 0);
 423         if(stats == (void*)-1) {
 424                 fatal_exit("shmat(%d): %s", id_arr, strerror(errno));
 425         }
 426
 427         /* print the stats */
 428         do_stats_shm(cfg, stats, shm_stat);
 429
 430         /* shutdown */
 431         shmdt(shm_stat);
 432         shmdt(stats);
 433         config_delete(cfg);
 434 #else
 435         (void)cfgfile;
 436 #endif /* HAVE_SHMGET */
 437 }
 438
 439 /** exit with ssl error */
 440 static void ssl_err(const char* s)
 441 {
 442         fprintf(stderr, "error: %s\n", s);
 443         ERR_print_errors_fp(stderr);
 444         exit(1);
 445 }
 446
 447 /** setup SSL context */
 448 static SSL_CTX*
 449 setup_ctx(struct config_file* cfg)
 450 {
 451         char* s_cert=NULL, *c_key=NULL, *c_cert=NULL;
 452         SSL_CTX* ctx;
 453
 454         if(cfg->remote_control_use_cert) {
 455                 s_cert = fname_after_chroot(cfg->server_cert_file, cfg, 1);
 456                 c_key = fname_after_chroot(cfg->control_key_file, cfg, 1);
 457                 c_cert = fname_after_chroot(cfg->control_cert_file, cfg, 1);
 458                 if(!s_cert || !c_key || !c_cert)
 459                         fatal_exit("out of memory");
 460         }
 461         ctx = SSL_CTX_new(SSLv23_client_method());
 462         if(!ctx)
 463                 ssl_err("could not allocate SSL_CTX pointer");
 464         if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2)
 465                 != SSL_OP_NO_SSLv2)
 466                 ssl_err("could not set SSL_OP_NO_SSLv2");
 467         if(cfg->remote_control_use_cert) {
 468                 if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3)
 469                         != SSL_OP_NO_SSLv3)
 470                         ssl_err("could not set SSL_OP_NO_SSLv3");
 471                 if(!SSL_CTX_use_certificate_chain_file(ctx,c_cert) ||
 472                     !SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM)
 473                     || !SSL_CTX_check_private_key(ctx))
 474                         ssl_err("Error setting up SSL_CTX client key and cert");
 475                 if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1)
 476                         ssl_err("Error setting up SSL_CTX verify, server cert");
 477                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 478
 479                 free(s_cert);
 480                 free(c_key);
 481                 free(c_cert);
 482         } else {
 483                 /* Use ciphers that don't require authentication  */
 484 #if defined(SSL_OP_NO_TLSv1_3)
 485                 /* in openssl 1.1.1, negotiation code for tls 1.3 does
 486                  * not allow the unauthenticated aNULL and eNULL ciphers */
 487                 SSL_CTX_set_options(ctx, SSL_OP_NO_TLSv1_3);
 488 #endif
 489 #ifdef HAVE_SSL_CTX_SET_SECURITY_LEVEL
 490                 SSL_CTX_set_security_level(ctx, 0);
 491 #endif
 492                 if(!SSL_CTX_set_cipher_list(ctx, "aNULL:eNULL"))
 493                         ssl_err("Error setting NULL cipher!");
 494         }
 495         return ctx;
 496 }
 497
 498 /** contact the server with TCP connect */
 499 static int
 500 contact_server(const char* svr, struct config_file* cfg, int statuscmd)
 501 {
 502         struct sockaddr_storage addr;
 503         socklen_t addrlen;
 504         int addrfamily = 0;
 505         int fd;
 506         /* use svr or the first config entry */
 507         if(!svr) {
 508                 if(cfg->control_ifs) {
 509                         svr = cfg->control_ifs->str;
 510                 } else if(cfg->do_ip4) {
 511                         svr = "127.0.0.1";
 512                 } else {
 513                         svr = "::1";
 514                 }
 515                 /* config 0 addr (everything), means ask localhost */
 516                 if(strcmp(svr, "0.0.0.0") == 0)
 517                         svr = "127.0.0.1";
 518                 else if(strcmp(svr, "::0") == 0 ||
 519                         strcmp(svr, "0::0") == 0 ||
 520                         strcmp(svr, "0::") == 0 ||
 521                         strcmp(svr, "::") == 0)
 522                         svr = "::1";
 523         }
 524         if(strchr(svr, '@')) {
 525                 if(!extstrtoaddr(svr, &addr, &addrlen))
 526                         fatal_exit("could not parse IP@port: %s", svr);
 527 #ifdef HAVE_SYS_UN_H
 528         } else if(svr[0] == '/') {
 529                 struct sockaddr_un* usock = (struct sockaddr_un *) &addr;
 530                 usock->sun_family = AF_LOCAL;
 531 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 532                 usock->sun_len = (unsigned)sizeof(usock);
 533 #endif
 534                 (void)strlcpy(usock->sun_path, svr, sizeof(usock->sun_path));
 535                 addrlen = (socklen_t)sizeof(struct sockaddr_un);
 536                 addrfamily = AF_LOCAL;
 537 #endif
 538         } else {
 539                 if(!ipstrtoaddr(svr, cfg->control_port, &addr, &addrlen))
 540                         fatal_exit("could not parse IP: %s", svr);
 541         }
 542
 543         if(addrfamily == 0)
 544                 addrfamily = addr_is_ip6(&addr, addrlen)?AF_INET6:AF_INET;
 545         fd = socket(addrfamily, SOCK_STREAM, 0);
 546         if(fd == -1) {
 547 #ifndef USE_WINSOCK
 548                 fatal_exit("socket: %s", strerror(errno));
 549 #else
 550                 fatal_exit("socket: %s", wsa_strerror(WSAGetLastError()));
 551 #endif
 552         }
 553         if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) {
 554 #ifndef USE_WINSOCK
 555                 log_err_addr("connect", strerror(errno), &addr, addrlen);
 556                 if(errno == ECONNREFUSED && statuscmd) {
 557                         printf("unbound is stopped\n");
 558                         exit(3);
 559                 }
 560 #else
 561                 log_err_addr("connect", wsa_strerror(WSAGetLastError()), &addr, addrlen);
 562                 if(WSAGetLastError() == WSAECONNREFUSED && statuscmd) {
 563                         printf("unbound is stopped\n");
 564                         exit(3);
 565                 }
 566 #endif
 567                 exit(1);
 568         }
 569         return fd;
 570 }
 571
 572 /** setup SSL on the connection */
 573 static SSL*
 574 setup_ssl(SSL_CTX* ctx, int fd, struct config_file* cfg)
 575 {
 576         SSL* ssl;
 577         X509* x;
 578         int r;
 579
 580         ssl = SSL_new(ctx);
 581         if(!ssl)
 582                 ssl_err("could not SSL_new");
 583         SSL_set_connect_state(ssl);
 584         (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
 585         if(!SSL_set_fd(ssl, fd))
 586                 ssl_err("could not SSL_set_fd");
 587         while(1) {
 588                 ERR_clear_error();
 589                 if( (r=SSL_do_handshake(ssl)) == 1)
 590                         break;
 591                 r = SSL_get_error(ssl, r);
 592                 if(r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE)
 593                         ssl_err("SSL handshake failed");
 594                 /* wants to be called again */
 595         }
 596
 597         /* check authenticity of server */
 598         if(SSL_get_verify_result(ssl) != X509_V_OK)
 599                 ssl_err("SSL verification failed");
 600         if(cfg->remote_control_use_cert) {
 601                 x = SSL_get_peer_certificate(ssl);
 602                 if(!x)
 603                         ssl_err("Server presented no peer certificate");
 604                 X509_free(x);
 605         }
 606
 607         return ssl;
 608 }
 609
 610 /** send stdin to server */
 611 static void
 612 send_file(SSL* ssl, FILE* in, char* buf, size_t sz)
 613 {
 614         while(fgets(buf, (int)sz, in)) {
 615                 if(SSL_write(ssl, buf, (int)strlen(buf)) <= 0)
 616                         ssl_err("could not SSL_write contents");
 617         }
 618 }
 619
 620 /** send end-of-file marker to server */
 621 static void
 622 send_eof(SSL* ssl)
 623 {
 624         char e[] = {0x04, 0x0a};
 625         if(SSL_write(ssl, e, (int)sizeof(e)) <= 0)
 626                 ssl_err("could not SSL_write end-of-file marker");
 627 }
 628
 629 /** send command and display result */
 630 static int
 631 go_cmd(SSL* ssl, int quiet, int argc, char* argv[])
 632 {
 633         char pre[10];
 634         const char* space=" ";
 635         const char* newline="\n";
 636         int was_error = 0, first_line = 1;
 637         int r, i;
 638         char buf[1024];
 639         snprintf(pre, sizeof(pre), "UBCT%d ", UNBOUND_CONTROL_VERSION);
 640         if(SSL_write(ssl, pre, (int)strlen(pre)) <= 0)
 641                 ssl_err("could not SSL_write");
 642         for(i=0; i<argc; i++) {
 643                 if(SSL_write(ssl, space, (int)strlen(space)) <= 0)
 644                         ssl_err("could not SSL_write");
 645                 if(SSL_write(ssl, argv[i], (int)strlen(argv[i])) <= 0)
 646                         ssl_err("could not SSL_write");
 647         }
 648         if(SSL_write(ssl, newline, (int)strlen(newline)) <= 0)
 649                 ssl_err("could not SSL_write");
 650
 651         if(argc == 1 && strcmp(argv[0], "load_cache") == 0) {
 652                 send_file(ssl, stdin, buf, sizeof(buf));
 653         }
 654         else if(argc == 1 && (strcmp(argv[0], "local_zones") == 0 ||
 655                 strcmp(argv[0], "local_zones_remove") == 0 ||
 656                 strcmp(argv[0], "local_datas") == 0 ||
 657                 strcmp(argv[0], "local_datas_remove") == 0)) {
 658                 send_file(ssl, stdin, buf, sizeof(buf));
 659                 send_eof(ssl);
 660         }
 661
 662         while(1) {
 663                 ERR_clear_error();
 664                 if((r = SSL_read(ssl, buf, (int)sizeof(buf)-1)) <= 0) {
 665                         if(SSL_get_error(ssl, r) == SSL_ERROR_ZERO_RETURN) {
 666                                 /* EOF */
 667                                 break;
 668                         }
 669                         ssl_err("could not SSL_read");
 670                 }
 671                 buf[r] = 0;
 672                 if(first_line && strncmp(buf, "error", 5) == 0) {
 673                         printf("%s", buf);
 674                         was_error = 1;
 675                 } else if (!quiet)
 676                         printf("%s", buf);
 677
 678                 first_line = 0;
 679         }
 680         return was_error;
 681 }
 682
 683 /** go ahead and read config, contact server and perform command and display */
 684 static int
 685 go(const char* cfgfile, char* svr, int quiet, int argc, char* argv[])
 686 {
 687         struct config_file* cfg;
 688         int fd, ret;
 689         SSL_CTX* ctx;
 690         SSL* ssl;
 691
 692         /* read config */
 693         if(!(cfg = config_create()))
 694                 fatal_exit("out of memory");
 695         if(!config_read(cfg, cfgfile, NULL))
 696                 fatal_exit("could not read config file");
 697         if(!cfg->remote_control_enable)
 698                 log_warn("control-enable is 'no' in the config file.");
 699 #ifdef UB_ON_WINDOWS
 700         w_config_adjust_directory(cfg);
 701 #endif
 702         ctx = setup_ctx(cfg);
 703
 704         /* contact server */
 705         fd = contact_server(svr, cfg, argc>0&&strcmp(argv[0],"status")==0);
 706         ssl = setup_ssl(ctx, fd, cfg);
 707
 708         /* send command */
 709         ret = go_cmd(ssl, quiet, argc, argv);
 710
 711         SSL_free(ssl);
 712 #ifndef USE_WINSOCK
 713         close(fd);
 714 #else
 715         closesocket(fd);
 716 #endif
 717         SSL_CTX_free(ctx);
 718         config_delete(cfg);
 719         return ret;
 720 }
 721
 722 /** getopt global, in case header files fail to declare it. */
 723 extern int optind;
 724 /** getopt global, in case header files fail to declare it. */
 725 extern char* optarg;
 726
 727 /** Main routine for unbound-control */
 728 int main(int argc, char* argv[])
 729 {
 730         int c, ret;
 731         int quiet = 0;
 732         const char* cfgfile = CONFIGFILE;
 733         char* svr = NULL;
 734 #ifdef USE_WINSOCK
 735         int r;
 736         WSADATA wsa_data;
 737 #endif
 738 #ifdef USE_THREAD_DEBUG
 739         /* stop the file output from unbound-control, overwrites the servers */
 740         extern int check_locking_order;
 741         check_locking_order = 0;
 742 #endif /* USE_THREAD_DEBUG */
 743         log_ident_set("unbound-control");
 744         log_init(NULL, 0, NULL);
 745         checklock_start();
 746 #ifdef USE_WINSOCK
 747         /* use registry config file in preference to compiletime location */
 748         if(!(cfgfile=w_lookup_reg_str("Software\\Unbound", "ConfigFile")))
 749                 cfgfile = CONFIGFILE;
 750 #endif
 751         /* parse the options */
 752         while( (c=getopt(argc, argv, "c:s:qh")) != -1) {
 753                 switch(c) {
 754                 case 'c':
 755                         cfgfile = optarg;
 756                         break;
 757                 case 's':
 758                         svr = optarg;
 759                         break;
 760                 case 'q':
 761                         quiet = 1;
 762                         break;
 763                 case '?':
 764                 case 'h':
 765                 default:
 766                         usage();
 767                 }
 768         }
 769         argc -= optind;
 770         argv += optind;
 771         if(argc == 0)
 772                 usage();
 773         if(argc >= 1 && strcmp(argv[0], "start")==0) {
 774                 if(execlp("unbound", "unbound", "-c", cfgfile,
 775                         (char*)NULL) < 0) {
 776                         fatal_exit("could not exec unbound: %s",
 777                                 strerror(errno));
 778                 }
 779         }
 780         if(argc >= 1 && strcmp(argv[0], "stats_shm")==0) {
 781                 print_stats_shm(cfgfile);
 782                 return 0;
 783         }
 784
 785 #ifdef USE_WINSOCK
 786         if((r = WSAStartup(MAKEWORD(2,2), &wsa_data)) != 0)
 787                 fatal_exit("WSAStartup failed: %s", wsa_strerror(r));
 788 #endif
 789
 790 #ifdef HAVE_ERR_LOAD_CRYPTO_STRINGS
 791         ERR_load_crypto_strings();
 792 #endif
 793 #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
 794         ERR_load_SSL_strings();
 795 #endif
 796 #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_CRYPTO)
 797         OpenSSL_add_all_algorithms();
 798 #else
 799         OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
 800                 | OPENSSL_INIT_ADD_ALL_DIGESTS
 801                 | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 802 #endif
 803 #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
 804         (void)SSL_library_init();
 805 #else
 806         (void)OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
 807 #endif
 808
 809         if(!RAND_status()) {
 810                 /* try to seed it */
 811                 unsigned char buf[256];
 812                 unsigned int seed=(unsigned)time(NULL) ^ (unsigned)getpid();
 813                 unsigned int v = seed;
 814                 size_t i;
 815                 for(i=0; i<256/sizeof(v); i++) {
 816                         memmove(buf+i*sizeof(v), &v, sizeof(v));
 817                         v = v*seed + (unsigned int)i;
 818                 }
 819                 RAND_seed(buf, 256);
 820                 log_warn("no entropy, seeding openssl PRNG with time\n");
 821         }
 822
 823         ret = go(cfgfile, svr, quiet, argc, argv);
 824
 825 #ifdef USE_WINSOCK
 826         WSACleanup();
 827 #endif
 828         checklock_stop();
 829         return ret;
 830 }