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