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 static void usage(void) ATTR_NORETURN;
  77 static void ssl_err(const char* s) ATTR_NORETURN;
  78 static void ssl_path_err(const char* s, const char *path) ATTR_NORETURN;
  79
  80 /** Give unbound-control usage, and exit (1). */
  81 static void
  82 usage(void)
  83 {
  84         printf("Usage:  unbound-control [options] command\n");
  85         printf("        Remote control utility for unbound server.\n");
  86         printf("Options:\n");
  87         printf("  -c file       config file, default is %s\n", CONFIGFILE);
  88         printf("  -s ip[@port]  server address, if omitted config is used.\n");
  89         printf("  -q            quiet (don't print anything if it works ok).\n");
  90         printf("  -h            show this usage help.\n");
  91         printf("Commands:\n");
  92         printf("  start                         start server; runs unbound(8)\n");
  93         printf("  stop                          stops the server\n");
  94         printf("  reload                        reloads the server\n");
  95         printf("                                (this flushes data, stats, requestlist)\n");
  96         printf("  stats                         print statistics\n");
  97         printf("  stats_noreset                 peek at statistics\n");
  98 #ifdef HAVE_SHMGET
  99         printf("  stats_shm                     print statistics using shm\n");
 100 #endif
 101         printf("  status                        display status of server\n");
 102         printf("  verbosity <number>            change logging detail\n");
 103         printf("  log_reopen                    close and open the logfile\n");
 104         printf("  local_zone <name> <type>      add new local zone\n");
 105         printf("  local_zone_remove <name>      remove local zone and its contents\n");
 106         printf("  local_data <RR data...>       add local data, for example\n");
 107         printf("                                local_data www.example.com A 192.0.2.1\n");
 108         printf("  local_data_remove <name>      remove local RR data from name\n");
 109         printf("  local_zones, local_zones_remove, local_datas, local_datas_remove\n");
 110         printf("                                same, but read list from stdin\n");
 111         printf("                                (one entry per line).\n");
 112         printf("  dump_cache                    print cache to stdout\n");
 113         printf("  load_cache                    load cache from stdin\n");
 114         printf("  lookup <name>                 print nameservers for name\n");
 115         printf("  flush <name>                  flushes common types for name from cache\n");
 116         printf("                                types:  A, AAAA, MX, PTR, NS,\n");
 117         printf("                                        SOA, CNAME, DNAME, SRV, NAPTR\n");
 118         printf("  flush_type <name> <type>      flush name, type from cache\n");
 119         printf("  flush_zone <name>             flush everything at or under name\n");
 120         printf("                                from rr and dnssec caches\n");
 121         printf("  flush_bogus                   flush all bogus data\n");
 122         printf("  flush_negative                flush all negative data\n");
 123         printf("  flush_stats                   flush statistics, make zero\n");
 124         printf("  flush_requestlist             drop queries that are worked on\n");
 125         printf("  dump_requestlist              show what is worked on by first thread\n");
 126         printf("  flush_infra [all | ip]        remove ping, edns for one IP or all\n");
 127         printf("  dump_infra                    show ping and edns entries\n");
 128         printf("  set_option opt: val           set option to value, no reload\n");
 129         printf("  get_option opt                get option value\n");
 130         printf("  list_stubs                    list stub-zones and root hints in use\n");
 131         printf("  list_forwards                 list forward-zones in use\n");
 132         printf("  list_insecure                 list domain-insecure zones\n");
 133         printf("  list_local_zones              list local-zones in use\n");
 134         printf("  list_local_data               list local-data RRs in use\n");
 135         printf("  insecure_add zone             add domain-insecure zone\n");
 136         printf("  insecure_remove zone          remove domain-insecure zone\n");
 137         printf("  forward_add [+i] zone addr..  add forward-zone with servers\n");
 138         printf("  forward_remove [+i] zone      remove forward zone\n");
 139         printf("  stub_add [+ip] zone addr..    add stub-zone with servers\n");
 140         printf("  stub_remove [+i] zone         remove stub zone\n");
 141         printf("                +i              also do dnssec insecure point\n");
 142         printf("                +p              set stub to use priming\n");
 143         printf("  forward [off | addr ...]      without arg show forward setup\n");
 144         printf("                                or off to turn off root forwarding\n");
 145         printf("                                or give list of ip addresses\n");
 146         printf("  ratelimit_list [+a]           list ratelimited domains\n");
 147         printf("  ip_ratelimit_list [+a]        list ratelimited ip addresses\n");
 148         printf("                +a              list all, also not ratelimited\n");
 149         printf("  list_auth_zones               list auth zones\n");
 150         printf("  auth_zone_reload zone         reload auth zone from zonefile\n");
 151         printf("  auth_zone_transfer zone       transfer auth zone from master\n");
 152         printf("  view_list_local_zones view    list local-zones in view\n");
 153         printf("  view_list_local_data  view    list local-data RRs in view\n");
 154         printf("  view_local_zone view name type        add local-zone in view\n");
 155         printf("  view_local_zone_remove view name      remove local-zone in view\n");
 156         printf("  view_local_data view RR...            add local-data in view\n");
 157         printf("  view_local_datas view                 add list of local-data to view\n");
 158         printf("                                        one entry per line read from stdin\n");
 159         printf("  view_local_data_remove view name      remove local-data in view\n");
 160         printf("Version %s\n", PACKAGE_VERSION);
 161         printf("BSD licensed, see LICENSE in source package for details.\n");
 162         printf("Report bugs to %s\n", PACKAGE_BUGREPORT);
 163         exit(1);
 164 }
 165
 166 #ifdef HAVE_SHMGET
 167 /** what to put on statistics lines between var and value, ": " or "=" */
 168 #define SQ "="
 169 /** if true, inhibits a lot of =0 lines from the stats output */
 170 static const int inhibit_zero = 1;
 171 /** divide sum of timers to get average */
 172 static void
 173 timeval_divide(struct timeval* avg, const struct timeval* sum, long long d)
 174 {
 175 #ifndef S_SPLINT_S
 176         size_t leftover;
 177         if(d == 0) {
 178                 avg->tv_sec = 0;
 179                 avg->tv_usec = 0;
 180                 return;
 181         }
 182         avg->tv_sec = sum->tv_sec / d;
 183         avg->tv_usec = sum->tv_usec / d;
 184         /* handle fraction from seconds divide */
 185         leftover = sum->tv_sec - avg->tv_sec*d;
 186         avg->tv_usec += (leftover*1000000)/d;
 187 #endif
 188 }
 189
 190 /** print unsigned long stats value */
 191 #define PR_UL_NM(str, var) printf("%s."str SQ"%lu\n", nm, (unsigned long)(var));
 192 #define PR_UL(str, var) printf(str SQ"%lu\n", (unsigned long)(var));
 193 #define PR_UL_SUB(str, nm, var) printf(str".%s"SQ"%lu\n", nm, (unsigned long)(var));
 194 #define PR_TIMEVAL(str, var) printf(str SQ ARG_LL "d.%6.6d\n", \
 195         (long long)var.tv_sec, (int)var.tv_usec);
 196 #define PR_STATSTIME(str, var) printf(str SQ ARG_LL "d.%6.6d\n", \
 197         (long long)var ## _sec, (int)var ## _usec);
 198 #define PR_LL(str, var) printf(str SQ ARG_LL"d\n", (long long)(var));
 199
 200 /** print stat block */
 201 static void pr_stats(const char* nm, struct ub_stats_info* s)
 202 {
 203         struct timeval sumwait, avg;
 204         PR_UL_NM("num.queries", s->svr.num_queries);
 205         PR_UL_NM("num.queries_ip_ratelimited",
 206                 s->svr.num_queries_ip_ratelimited);
 207         PR_UL_NM("num.cachehits",
 208                 s->svr.num_queries - s->svr.num_queries_missed_cache);
 209         PR_UL_NM("num.cachemiss", s->svr.num_queries_missed_cache);
 210         PR_UL_NM("num.prefetch", s->svr.num_queries_prefetch);
 211         PR_UL_NM("num.zero_ttl", s->svr.zero_ttl_responses);
 212         PR_UL_NM("num.recursivereplies", s->mesh_replies_sent);
 213 #ifdef USE_DNSCRYPT
 214     PR_UL_NM("num.dnscrypt.crypted", s->svr.num_query_dnscrypt_crypted);
 215     PR_UL_NM("num.dnscrypt.cert", s->svr.num_query_dnscrypt_cert);
 216     PR_UL_NM("num.dnscrypt.cleartext", s->svr.num_query_dnscrypt_cleartext);
 217     PR_UL_NM("num.dnscrypt.malformed",
 218              s->svr.num_query_dnscrypt_crypted_malformed);
 219 #endif /* USE_DNSCRYPT */
 220         printf("%s.requestlist.avg"SQ"%g\n", nm,
 221                 (s->svr.num_queries_missed_cache+s->svr.num_queries_prefetch)?
 222                         (double)s->svr.sum_query_list_size/
 223                         (double)(s->svr.num_queries_missed_cache+
 224                         s->svr.num_queries_prefetch) : 0.0);
 225         PR_UL_NM("requestlist.max", s->svr.max_query_list_size);
 226         PR_UL_NM("requestlist.overwritten", s->mesh_jostled);
 227         PR_UL_NM("requestlist.exceeded", s->mesh_dropped);
 228         PR_UL_NM("requestlist.current.all", s->mesh_num_states);
 229         PR_UL_NM("requestlist.current.user", s->mesh_num_reply_states);
 230 #ifndef S_SPLINT_S
 231         sumwait.tv_sec = s->mesh_replies_sum_wait_sec;
 232         sumwait.tv_usec = s->mesh_replies_sum_wait_usec;
 233 #endif
 234         timeval_divide(&avg, &sumwait, s->mesh_replies_sent);
 235         printf("%s.", nm);
 236         PR_TIMEVAL("recursion.time.avg", avg);
 237         printf("%s.recursion.time.median"SQ"%g\n", nm, s->mesh_time_median);
 238         PR_UL_NM("tcpusage", s->svr.tcp_accept_usage);
 239 }
 240
 241 /** print uptime */
 242 static void print_uptime(struct ub_shm_stat_info* shm_stat)
 243 {
 244         PR_STATSTIME("time.now", shm_stat->time.now);
 245         PR_STATSTIME("time.up", shm_stat->time.up);
 246         PR_STATSTIME("time.elapsed", shm_stat->time.elapsed);
 247 }
 248
 249 /** print memory usage */
 250 static void print_mem(struct ub_shm_stat_info* shm_stat,
 251         struct ub_stats_info* s)
 252 {
 253         PR_LL("mem.cache.rrset", shm_stat->mem.rrset);
 254         PR_LL("mem.cache.message", shm_stat->mem.msg);
 255         PR_LL("mem.mod.iterator", shm_stat->mem.iter);
 256         PR_LL("mem.mod.validator", shm_stat->mem.val);
 257         PR_LL("mem.mod.respip", shm_stat->mem.respip);
 258 #ifdef CLIENT_SUBNET
 259         PR_LL("mem.mod.subnet", shm_stat->mem.subnet);
 260 #endif
 261 #ifdef USE_IPSECMOD
 262         PR_LL("mem.mod.ipsecmod", shm_stat->mem.ipsecmod);
 263 #endif
 264 #ifdef USE_DNSCRYPT
 265         PR_LL("mem.cache.dnscrypt_shared_secret",
 266                 shm_stat->mem.dnscrypt_shared_secret);
 267         PR_LL("mem.cache.dnscrypt_nonce",
 268                 shm_stat->mem.dnscrypt_nonce);
 269 #endif
 270         PR_LL("mem.streamwait", s->svr.mem_stream_wait);
 271 }
 272
 273 /** print histogram */
 274 static void print_hist(struct ub_stats_info* s)
 275 {
 276         struct timehist* hist;
 277         size_t i;
 278         hist = timehist_setup();
 279         if(!hist)
 280                 fatal_exit("out of memory");
 281         timehist_import(hist, s->svr.hist, NUM_BUCKETS_HIST);
 282         for(i=0; i<hist->num; i++) {
 283                 printf("histogram.%6.6d.%6.6d.to.%6.6d.%6.6d=%lu\n",
 284                         (int)hist->buckets[i].lower.tv_sec,
 285                         (int)hist->buckets[i].lower.tv_usec,
 286                         (int)hist->buckets[i].upper.tv_sec,
 287                         (int)hist->buckets[i].upper.tv_usec,
 288                         (unsigned long)hist->buckets[i].count);
 289         }
 290         timehist_delete(hist);
 291 }
 292
 293 /** print extended */
 294 static void print_extended(struct ub_stats_info* s)
 295 {
 296         int i;
 297         char nm[16];
 298
 299         /* TYPE */
 300         for(i=0; i<UB_STATS_QTYPE_NUM; i++) {
 301                 if(inhibit_zero && s->svr.qtype[i] == 0)
 302                         continue;
 303                 sldns_wire2str_type_buf((uint16_t)i, nm, sizeof(nm));
 304                 PR_UL_SUB("num.query.type", nm, s->svr.qtype[i]);
 305         }
 306         if(!inhibit_zero || s->svr.qtype_big) {
 307                 PR_UL("num.query.type.other", s->svr.qtype_big);
 308         }
 309
 310         /* CLASS */
 311         for(i=0; i<UB_STATS_QCLASS_NUM; i++) {
 312                 if(inhibit_zero && s->svr.qclass[i] == 0)
 313                         continue;
 314                 sldns_wire2str_class_buf((uint16_t)i, nm, sizeof(nm));
 315                 PR_UL_SUB("num.query.class", nm, s->svr.qclass[i]);
 316         }
 317         if(!inhibit_zero || s->svr.qclass_big) {
 318                 PR_UL("num.query.class.other", s->svr.qclass_big);
 319         }
 320
 321         /* OPCODE */
 322         for(i=0; i<UB_STATS_OPCODE_NUM; i++) {
 323                 if(inhibit_zero && s->svr.qopcode[i] == 0)
 324                         continue;
 325                 sldns_wire2str_opcode_buf(i, nm, sizeof(nm));
 326                 PR_UL_SUB("num.query.opcode", nm, s->svr.qopcode[i]);
 327         }
 328
 329         /* transport */
 330         PR_UL("num.query.tcp", s->svr.qtcp);
 331         PR_UL("num.query.tcpout", s->svr.qtcp_outgoing);
 332         PR_UL("num.query.tls", s->svr.qtls);
 333         PR_UL("num.query.tls_resume", s->svr.qtls_resume);
 334         PR_UL("num.query.ipv6", s->svr.qipv6);
 335
 336         /* flags */
 337         PR_UL("num.query.flags.QR", s->svr.qbit_QR);
 338         PR_UL("num.query.flags.AA", s->svr.qbit_AA);
 339         PR_UL("num.query.flags.TC", s->svr.qbit_TC);
 340         PR_UL("num.query.flags.RD", s->svr.qbit_RD);
 341         PR_UL("num.query.flags.RA", s->svr.qbit_RA);
 342         PR_UL("num.query.flags.Z", s->svr.qbit_Z);
 343         PR_UL("num.query.flags.AD", s->svr.qbit_AD);
 344         PR_UL("num.query.flags.CD", s->svr.qbit_CD);
 345         PR_UL("num.query.edns.present", s->svr.qEDNS);
 346         PR_UL("num.query.edns.DO", s->svr.qEDNS_DO);
 347
 348         /* RCODE */
 349         for(i=0; i<UB_STATS_RCODE_NUM; i++) {
 350                 /* Always include RCODEs 0-5 */
 351                 if(inhibit_zero && i > LDNS_RCODE_REFUSED && s->svr.ans_rcode[i] == 0)
 352                         continue;
 353                 sldns_wire2str_rcode_buf(i, nm, sizeof(nm));
 354                 PR_UL_SUB("num.answer.rcode", nm, s->svr.ans_rcode[i]);
 355         }
 356         if(!inhibit_zero || s->svr.ans_rcode_nodata) {
 357                 PR_UL("num.answer.rcode.nodata", s->svr.ans_rcode_nodata);
 358         }
 359         /* iteration */
 360         PR_UL("num.query.ratelimited", s->svr.queries_ratelimited);
 361         /* validation */
 362         PR_UL("num.answer.secure", s->svr.ans_secure);
 363         PR_UL("num.answer.bogus", s->svr.ans_bogus);
 364         PR_UL("num.rrset.bogus", s->svr.rrset_bogus);
 365         PR_UL("num.query.aggressive.NOERROR", s->svr.num_neg_cache_noerror);
 366         PR_UL("num.query.aggressive.NXDOMAIN", s->svr.num_neg_cache_nxdomain);
 367         /* threat detection */
 368         PR_UL("unwanted.queries", s->svr.unwanted_queries);
 369         PR_UL("unwanted.replies", s->svr.unwanted_replies);
 370         /* cache counts */
 371         PR_UL("msg.cache.count", s->svr.msg_cache_count);
 372         PR_UL("rrset.cache.count", s->svr.rrset_cache_count);
 373         PR_UL("infra.cache.count", s->svr.infra_cache_count);
 374         PR_UL("key.cache.count", s->svr.key_cache_count);
 375 #ifdef USE_DNSCRYPT
 376         PR_UL("dnscrypt_shared_secret.cache.count",
 377                          s->svr.shared_secret_cache_count);
 378         PR_UL("num.query.dnscrypt.shared_secret.cachemiss",
 379                          s->svr.num_query_dnscrypt_secret_missed_cache);
 380         PR_UL("dnscrypt_nonce.cache.count", s->svr.nonce_cache_count);
 381         PR_UL("num.query.dnscrypt.replay",
 382                          s->svr.num_query_dnscrypt_replay);
 383 #endif /* USE_DNSCRYPT */
 384         PR_UL("num.query.authzone.up", s->svr.num_query_authzone_up);
 385         PR_UL("num.query.authzone.down", s->svr.num_query_authzone_down);
 386 #ifdef CLIENT_SUBNET
 387         PR_UL("num.query.subnet", s->svr.num_query_subnet);
 388         PR_UL("num.query.subnet_cache", s->svr.num_query_subnet_cache);
 389 #endif
 390 }
 391
 392 /** print statistics out of memory structures */
 393 static void do_stats_shm(struct config_file* cfg, struct ub_stats_info* stats,
 394         struct ub_shm_stat_info* shm_stat)
 395 {
 396         int i;
 397         char nm[32];
 398         for(i=0; i<cfg->num_threads; i++) {
 399                 snprintf(nm, sizeof(nm), "thread%d", i);
 400                 pr_stats(nm, &stats[i+1]);
 401         }
 402         pr_stats("total", &stats[0]);
 403         print_uptime(shm_stat);
 404         if(cfg->stat_extended) {
 405                 print_mem(shm_stat, &stats[0]);
 406                 print_hist(stats);
 407                 print_extended(stats);
 408         }
 409 }
 410 #endif /* HAVE_SHMGET */
 411
 412 /** print statistics from shm memory segment */
 413 static void print_stats_shm(const char* cfgfile)
 414 {
 415 #ifdef HAVE_SHMGET
 416         struct config_file* cfg;
 417         struct ub_stats_info* stats;
 418         struct ub_shm_stat_info* shm_stat;
 419         int id_ctl, id_arr;
 420         /* read config */
 421         if(!(cfg = config_create()))
 422                 fatal_exit("out of memory");
 423         if(!config_read(cfg, cfgfile, NULL))
 424                 fatal_exit("could not read config file");
 425         /* get shm segments */
 426         id_ctl = shmget(cfg->shm_key, sizeof(int), SHM_R|SHM_W);
 427         if(id_ctl == -1) {
 428                 fatal_exit("shmget(%d): %s", cfg->shm_key, strerror(errno));
 429         }
 430         id_arr = shmget(cfg->shm_key+1, sizeof(int), SHM_R|SHM_W);
 431         if(id_arr == -1) {
 432                 fatal_exit("shmget(%d): %s", cfg->shm_key+1, strerror(errno));
 433         }
 434         shm_stat = (struct ub_shm_stat_info*)shmat(id_ctl, NULL, 0);
 435         if(shm_stat == (void*)-1) {
 436                 fatal_exit("shmat(%d): %s", id_ctl, strerror(errno));
 437         }
 438         stats = (struct ub_stats_info*)shmat(id_arr, NULL, 0);
 439         if(stats == (void*)-1) {
 440                 fatal_exit("shmat(%d): %s", id_arr, strerror(errno));
 441         }
 442
 443         /* print the stats */
 444         do_stats_shm(cfg, stats, shm_stat);
 445
 446         /* shutdown */
 447         shmdt(shm_stat);
 448         shmdt(stats);
 449         config_delete(cfg);
 450 #else
 451         (void)cfgfile;
 452 #endif /* HAVE_SHMGET */
 453 }
 454
 455 /** exit with ssl error */
 456 static void ssl_err(const char* s)
 457 {
 458         fprintf(stderr, "error: %s\n", s);
 459         ERR_print_errors_fp(stderr);
 460         exit(1);
 461 }
 462
 463 /** exit with ssl error related to a file path */
 464 static void ssl_path_err(const char* s, const char *path)
 465 {
 466         unsigned long err;
 467         err = ERR_peek_error();
 468         if (ERR_GET_LIB(err) == ERR_LIB_SYS &&
 469                 (ERR_GET_FUNC(err) == SYS_F_FOPEN ||
 470                  ERR_GET_FUNC(err) == SYS_F_FREAD) ) {
 471                 fprintf(stderr, "error: %s\n%s: %s\n",
 472                         s, path, ERR_reason_error_string(err));
 473                 exit(1);
 474         } else {
 475                 ssl_err(s);
 476         }
 477 }
 478
 479 /** setup SSL context */
 480 static SSL_CTX*
 481 setup_ctx(struct config_file* cfg)
 482 {
 483         char* s_cert=NULL, *c_key=NULL, *c_cert=NULL;
 484         SSL_CTX* ctx;
 485
 486         if(!(options_remote_is_address(cfg) && cfg->control_use_cert))
 487                 return NULL;
 488         s_cert = fname_after_chroot(cfg->server_cert_file, cfg, 1);
 489         c_key = fname_after_chroot(cfg->control_key_file, cfg, 1);
 490         c_cert = fname_after_chroot(cfg->control_cert_file, cfg, 1);
 491         if(!s_cert || !c_key || !c_cert)
 492                 fatal_exit("out of memory");
 493         ctx = SSL_CTX_new(SSLv23_client_method());
 494         if(!ctx)
 495                 ssl_err("could not allocate SSL_CTX pointer");
 496         if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2) & SSL_OP_NO_SSLv2)
 497                 != SSL_OP_NO_SSLv2)
 498                 ssl_err("could not set SSL_OP_NO_SSLv2");
 499         if((SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv3) & SSL_OP_NO_SSLv3)
 500                 != SSL_OP_NO_SSLv3)
 501                 ssl_err("could not set SSL_OP_NO_SSLv3");
 502         if(!SSL_CTX_use_certificate_chain_file(ctx,c_cert))
 503                 ssl_path_err("Error setting up SSL_CTX client cert", c_cert);
 504         if (!SSL_CTX_use_PrivateKey_file(ctx,c_key,SSL_FILETYPE_PEM))
 505                 ssl_path_err("Error setting up SSL_CTX client key", c_key);
 506         if (!SSL_CTX_check_private_key(ctx))
 507                 ssl_err("Error setting up SSL_CTX client key");
 508         if (SSL_CTX_load_verify_locations(ctx, s_cert, NULL) != 1)
 509                 ssl_path_err("Error setting up SSL_CTX verify, server cert",
 510                              s_cert);
 511         SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 512
 513         free(s_cert);
 514         free(c_key);
 515         free(c_cert);
 516         return ctx;
 517 }
 518
 519 /** contact the server with TCP connect */
 520 static int
 521 contact_server(const char* svr, struct config_file* cfg, int statuscmd)
 522 {
 523         struct sockaddr_storage addr;
 524         socklen_t addrlen;
 525         int addrfamily = 0, proto = IPPROTO_TCP;
 526         int fd, useport = 1;
 527         /* use svr or the first config entry */
 528         if(!svr) {
 529                 if(cfg->control_ifs.first) {
 530                         svr = cfg->control_ifs.first->str;
 531                 } else if(cfg->do_ip4) {
 532                         svr = "127.0.0.1";
 533                 } else {
 534                         svr = "::1";
 535                 }
 536                 /* config 0 addr (everything), means ask localhost */
 537                 if(strcmp(svr, "0.0.0.0") == 0)
 538                         svr = "127.0.0.1";
 539                 else if(strcmp(svr, "::0") == 0 ||
 540                         strcmp(svr, "0::0") == 0 ||
 541                         strcmp(svr, "0::") == 0 ||
 542                         strcmp(svr, "::") == 0)
 543                         svr = "::1";
 544         }
 545         if(strchr(svr, '@')) {
 546                 if(!extstrtoaddr(svr, &addr, &addrlen))
 547                         fatal_exit("could not parse IP@port: %s", svr);
 548 #ifdef HAVE_SYS_UN_H
 549         } else if(svr[0] == '/') {
 550                 struct sockaddr_un* usock = (struct sockaddr_un *) &addr;
 551                 usock->sun_family = AF_LOCAL;
 552 #ifdef HAVE_STRUCT_SOCKADDR_UN_SUN_LEN
 553                 usock->sun_len = (unsigned)sizeof(usock);
 554 #endif
 555                 (void)strlcpy(usock->sun_path, svr, sizeof(usock->sun_path));
 556                 addrlen = (socklen_t)sizeof(struct sockaddr_un);
 557                 addrfamily = AF_LOCAL;
 558                 useport = 0;
 559                 proto = 0;
 560 #endif
 561         } else {
 562                 if(!ipstrtoaddr(svr, cfg->control_port, &addr, &addrlen))
 563                         fatal_exit("could not parse IP: %s", svr);
 564         }
 565
 566         if(addrfamily == 0)
 567                 addrfamily = addr_is_ip6(&addr, addrlen)?PF_INET6:PF_INET;
 568         fd = socket(addrfamily, SOCK_STREAM, proto);
 569         if(fd == -1) {
 570 #ifndef USE_WINSOCK
 571                 fatal_exit("socket: %s", strerror(errno));
 572 #else
 573                 fatal_exit("socket: %s", wsa_strerror(WSAGetLastError()));
 574 #endif
 575         }
 576         if(connect(fd, (struct sockaddr*)&addr, addrlen) < 0) {
 577 #ifndef USE_WINSOCK
 578                 int err = errno;
 579                 if(!useport) log_err("connect: %s for %s", strerror(err), svr);
 580                 else log_err_addr("connect", strerror(err), &addr, addrlen);
 581                 if(err == ECONNREFUSED && statuscmd) {
 582                         printf("unbound is stopped\n");
 583                         exit(3);
 584                 }
 585 #else
 586                 int wsaerr = WSAGetLastError();
 587                 if(!useport) log_err("connect: %s for %s", wsa_strerror(wsaerr), svr);
 588                 else log_err_addr("connect", wsa_strerror(wsaerr), &addr, addrlen);
 589                 if(wsaerr == WSAECONNREFUSED && statuscmd) {
 590                         printf("unbound is stopped\n");
 591                         exit(3);
 592                 }
 593 #endif
 594                 exit(1);
 595         }
 596         return fd;
 597 }
 598
 599 /** setup SSL on the connection */
 600 static SSL*
 601 setup_ssl(SSL_CTX* ctx, int fd)
 602 {
 603         SSL* ssl;
 604         X509* x;
 605         int r;
 606
 607         if(!ctx) return NULL;
 608         ssl = SSL_new(ctx);
 609         if(!ssl)
 610                 ssl_err("could not SSL_new");
 611         SSL_set_connect_state(ssl);
 612         (void)SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
 613         if(!SSL_set_fd(ssl, fd))
 614                 ssl_err("could not SSL_set_fd");
 615         while(1) {
 616                 ERR_clear_error();
 617                 if( (r=SSL_do_handshake(ssl)) == 1)
 618                         break;
 619                 r = SSL_get_error(ssl, r);
 620                 if(r != SSL_ERROR_WANT_READ && r != SSL_ERROR_WANT_WRITE)
 621                         ssl_err("SSL handshake failed");
 622                 /* wants to be called again */
 623         }
 624
 625         /* check authenticity of server */
 626         if(SSL_get_verify_result(ssl) != X509_V_OK)
 627                 ssl_err("SSL verification failed");
 628         x = SSL_get_peer_certificate(ssl);
 629         if(!x)
 630                 ssl_err("Server presented no peer certificate");
 631         X509_free(x);
 632
 633         return ssl;
 634 }
 635
 636 /** read from ssl or fd, fatalexit on error, 0 EOF, 1 success */
 637 static int
 638 remote_read(SSL* ssl, int fd, char* buf, size_t len)
 639 {
 640         if(ssl) {
 641                 int r;
 642                 ERR_clear_error();
 643                 if((r = SSL_read(ssl, buf, (int)len-1)) <= 0) {
 644                         if(SSL_get_error(ssl, r) == SSL_ERROR_ZERO_RETURN) {
 645                                 /* EOF */
 646                                 return 0;
 647                         }
 648                         ssl_err("could not SSL_read");
 649                 }
 650                 buf[r] = 0;
 651         } else {
 652                 ssize_t rr = recv(fd, buf, len-1, 0);
 653                 if(rr <= 0) {
 654                         if(rr == 0) {
 655                                 /* EOF */
 656                                 return 0;
 657                         }
 658 #ifndef USE_WINSOCK
 659                         fatal_exit("could not recv: %s", strerror(errno));
 660 #else
 661                         fatal_exit("could not recv: %s", wsa_strerror(WSAGetLastError()));
 662 #endif
 663                 }
 664                 buf[rr] = 0;
 665         }
 666         return 1;
 667 }
 668
 669 /** write to ssl or fd, fatalexit on error */
 670 static void
 671 remote_write(SSL* ssl, int fd, const char* buf, size_t len)
 672 {
 673         if(ssl) {
 674                 if(SSL_write(ssl, buf, (int)len) <= 0)
 675                         ssl_err("could not SSL_write");
 676         } else {
 677                 if(send(fd, buf, len, 0) < (ssize_t)len) {
 678 #ifndef USE_WINSOCK
 679                         fatal_exit("could not send: %s", strerror(errno));
 680 #else
 681                         fatal_exit("could not send: %s", wsa_strerror(WSAGetLastError()));
 682 #endif
 683                 }
 684         }
 685 }
 686
 687 /** send stdin to server */
 688 static void
 689 send_file(SSL* ssl, int fd, FILE* in, char* buf, size_t sz)
 690 {
 691         while(fgets(buf, (int)sz, in)) {
 692                 remote_write(ssl, fd, buf, strlen(buf));
 693         }
 694 }
 695
 696 /** send end-of-file marker to server */
 697 static void
 698 send_eof(SSL* ssl, int fd)
 699 {
 700         char e[] = {0x04, 0x0a};
 701         remote_write(ssl, fd, e, sizeof(e));
 702 }
 703
 704 /** send command and display result */
 705 static int
 706 go_cmd(SSL* ssl, int fd, int quiet, int argc, char* argv[])
 707 {
 708         char pre[10];
 709         const char* space=" ";
 710         const char* newline="\n";
 711         int was_error = 0, first_line = 1;
 712         int i;
 713         char buf[1024];
 714         snprintf(pre, sizeof(pre), "UBCT%d ", UNBOUND_CONTROL_VERSION);
 715         remote_write(ssl, fd, pre, strlen(pre));
 716         for(i=0; i<argc; i++) {
 717                 remote_write(ssl, fd, space, strlen(space));
 718                 remote_write(ssl, fd, argv[i], strlen(argv[i]));
 719         }
 720         remote_write(ssl, fd, newline, strlen(newline));
 721
 722         if(argc == 1 && strcmp(argv[0], "load_cache") == 0) {
 723                 send_file(ssl, fd, stdin, buf, sizeof(buf));
 724         }
 725         else if(argc >= 1 && (strcmp(argv[0], "local_zones") == 0 ||
 726                 strcmp(argv[0], "local_zones_remove") == 0 ||
 727                 strcmp(argv[0], "local_datas") == 0 ||
 728                 strcmp(argv[0], "view_local_datas") == 0 ||
 729                 strcmp(argv[0], "local_datas_remove") == 0)) {
 730                 send_file(ssl, fd, stdin, buf, sizeof(buf));
 731                 send_eof(ssl, fd);
 732         }
 733
 734         while(1) {
 735                 if(remote_read(ssl, fd, buf, sizeof(buf)) == 0) {
 736                         break; /* EOF */
 737                 }
 738                 if(first_line && strncmp(buf, "error", 5) == 0) {
 739                         printf("%s", buf);
 740                         was_error = 1;
 741                 } else if (!quiet)
 742                         printf("%s", buf);
 743
 744                 first_line = 0;
 745         }
 746         return was_error;
 747 }
 748
 749 /** go ahead and read config, contact server and perform command and display */
 750 static int
 751 go(const char* cfgfile, char* svr, int quiet, int argc, char* argv[])
 752 {
 753         struct config_file* cfg;
 754         int fd, ret;
 755         SSL_CTX* ctx;
 756         SSL* ssl;
 757
 758         /* read config */
 759         if(!(cfg = config_create()))
 760                 fatal_exit("out of memory");
 761         if(!config_read(cfg, cfgfile, NULL))
 762                 fatal_exit("could not read config file");
 763         if(!cfg->remote_control_enable)
 764                 log_warn("control-enable is 'no' in the config file.");
 765 #ifdef UB_ON_WINDOWS
 766         w_config_adjust_directory(cfg);
 767 #endif
 768         ctx = setup_ctx(cfg);
 769
 770         /* contact server */
 771         fd = contact_server(svr, cfg, argc>0&&strcmp(argv[0],"status")==0);
 772         ssl = setup_ssl(ctx, fd);
 773
 774         /* send command */
 775         ret = go_cmd(ssl, fd, quiet, argc, argv);
 776
 777         if(ssl) SSL_free(ssl);
 778 #ifndef USE_WINSOCK
 779         close(fd);
 780 #else
 781         closesocket(fd);
 782 #endif
 783         if(ctx) SSL_CTX_free(ctx);
 784         config_delete(cfg);
 785         return ret;
 786 }
 787
 788 /** getopt global, in case header files fail to declare it. */
 789 extern int optind;
 790 /** getopt global, in case header files fail to declare it. */
 791 extern char* optarg;
 792
 793 /** Main routine for unbound-control */
 794 int main(int argc, char* argv[])
 795 {
 796         int c, ret;
 797         int quiet = 0;
 798         const char* cfgfile = CONFIGFILE;
 799         char* svr = NULL;
 800 #ifdef USE_WINSOCK
 801         int r;
 802         WSADATA wsa_data;
 803 #endif
 804 #ifdef USE_THREAD_DEBUG
 805         /* stop the file output from unbound-control, overwrites the servers */
 806         extern int check_locking_order;
 807         check_locking_order = 0;
 808 #endif /* USE_THREAD_DEBUG */
 809         log_ident_set("unbound-control");
 810         log_init(NULL, 0, NULL);
 811         checklock_start();
 812 #ifdef USE_WINSOCK
 813         /* use registry config file in preference to compiletime location */
 814         if(!(cfgfile=w_lookup_reg_str("Software\\Unbound", "ConfigFile")))
 815                 cfgfile = CONFIGFILE;
 816 #endif
 817         /* parse the options */
 818         while( (c=getopt(argc, argv, "c:s:qh")) != -1) {
 819                 switch(c) {
 820                 case 'c':
 821                         cfgfile = optarg;
 822                         break;
 823                 case 's':
 824                         svr = optarg;
 825                         break;
 826                 case 'q':
 827                         quiet = 1;
 828                         break;
 829                 case '?':
 830                 case 'h':
 831                 default:
 832                         usage();
 833                 }
 834         }
 835         argc -= optind;
 836         argv += optind;
 837         if(argc == 0)
 838                 usage();
 839         if(argc >= 1 && strcmp(argv[0], "start")==0) {
 840                 if(execlp("unbound", "unbound", "-c", cfgfile,
 841                         (char*)NULL) < 0) {
 842                         fatal_exit("could not exec unbound: %s",
 843                                 strerror(errno));
 844                 }
 845         }
 846         if(argc >= 1 && strcmp(argv[0], "stats_shm")==0) {
 847                 print_stats_shm(cfgfile);
 848                 return 0;
 849         }
 850
 851 #ifdef USE_WINSOCK
 852         if((r = WSAStartup(MAKEWORD(2,2), &wsa_data)) != 0)
 853                 fatal_exit("WSAStartup failed: %s", wsa_strerror(r));
 854 #endif
 855
 856 #ifdef HAVE_ERR_LOAD_CRYPTO_STRINGS
 857         ERR_load_crypto_strings();
 858 #endif
 859 #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
 860         ERR_load_SSL_strings();
 861 #endif
 862 #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_CRYPTO)
 863         OpenSSL_add_all_algorithms();
 864 #else
 865         OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS
 866                 | OPENSSL_INIT_ADD_ALL_DIGESTS
 867                 | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 868 #endif
 869 #if OPENSSL_VERSION_NUMBER < 0x10100000 || !defined(HAVE_OPENSSL_INIT_SSL)
 870         (void)SSL_library_init();
 871 #else
 872         (void)OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);
 873 #endif
 874
 875         if(!RAND_status()) {
 876                 /* try to seed it */
 877                 unsigned char buf[256];
 878                 unsigned int seed=(unsigned)time(NULL) ^ (unsigned)getpid();
 879                 unsigned int v = seed;
 880                 size_t i;
 881                 for(i=0; i<256/sizeof(v); i++) {
 882                         memmove(buf+i*sizeof(v), &v, sizeof(v));
 883                         v = v*seed + (unsigned int)i;
 884                 }
 885                 RAND_seed(buf, 256);
 886                 log_warn("no entropy, seeding openssl PRNG with time\n");
 887         }
 888
 889         ret = go(cfgfile, svr, quiet, argc, argv);
 890
 891 #ifdef USE_WINSOCK
 892         WSACleanup();
 893 #endif
 894         checklock_stop();
 895         return ret;
 896 }