contrib/unbound/libunbound/libunbound.c

   1 /*
   2  * unbound.c - unbound validating resolver public API implementation
   3  *
   4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
   5  *
   6  * This software is open source.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * Redistributions of source code must retain the above copyright notice,
  13  * this list of conditions and the following disclaimer.
  14  *
  15  * Redistributions in binary form must reproduce the above copyright notice,
  16  * this list of conditions and the following disclaimer in the documentation
  17  * and/or other materials provided with the distribution.
  18  *
  19  * Neither the name of the NLNET LABS nor the names of its contributors may
  20  * be used to endorse or promote products derived from this software without
  21  * specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
  29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 /**
  37  * \file
  38  *
  39  * This file contains functions to resolve DNS queries and
  40  * validate the answers. Synchonously and asynchronously.
  41  *
  42  */
  43
  44 /* include the public api first, it should be able to stand alone */
  45 #include "libunbound/unbound.h"
  46 #include "libunbound/unbound-event.h"
  47 #include "config.h"
  48 #include <ctype.h>
  49 #include "libunbound/context.h"
  50 #include "libunbound/libworker.h"
  51 #include "util/locks.h"
  52 #include "util/config_file.h"
  53 #include "util/alloc.h"
  54 #include "util/module.h"
  55 #include "util/regional.h"
  56 #include "util/log.h"
  57 #include "util/random.h"
  58 #include "util/net_help.h"
  59 #include "util/tube.h"
  60 #include "util/ub_event.h"
  61 #include "services/modstack.h"
  62 #include "services/localzone.h"
  63 #include "services/cache/infra.h"
  64 #include "services/cache/rrset.h"
  65 #include "sldns/sbuffer.h"
  66 #ifdef HAVE_PTHREAD
  67 #include <signal.h>
  68 #endif
  69 #ifdef HAVE_SYS_WAIT_H
  70 #include <sys/wait.h>
  71 #endif
  72 #ifdef HAVE_TIME_H
  73 #include <time.h>
  74 #endif
  75
  76 #if defined(UB_ON_WINDOWS) && defined (HAVE_WINDOWS_H)
  77 #include <windows.h>
  78 #include <iphlpapi.h>
  79 #endif /* UB_ON_WINDOWS */
  80
  81 /** create context functionality, but no pipes */
  82 static struct ub_ctx* ub_ctx_create_nopipe(void)
  83 {
  84         struct ub_ctx* ctx;
  85         unsigned int seed;
  86 #ifdef USE_WINSOCK
  87         int r;
  88         WSADATA wsa_data;
  89 #endif
  90
  91         log_init(NULL, 0, NULL); /* logs to stderr */
  92         log_ident_set("libunbound");
  93 #ifdef USE_WINSOCK
  94         if((r = WSAStartup(MAKEWORD(2,2), &wsa_data)) != 0) {
  95                 log_err("could not init winsock. WSAStartup: %s",
  96                         wsa_strerror(r));
  97                 return NULL;
  98         }
  99 #endif
 100         verbosity = 0; /* errors only */
 101         checklock_start();
 102         ctx = (struct ub_ctx*)calloc(1, sizeof(*ctx));
 103         if(!ctx) {
 104                 errno = ENOMEM;
 105                 return NULL;
 106         }
 107         alloc_init(&ctx->superalloc, NULL, 0);
 108         seed = (unsigned int)time(NULL) ^ (unsigned int)getpid();
 109         if(!(ctx->seed_rnd = ub_initstate(seed, NULL))) {
 110                 seed = 0;
 111                 ub_randfree(ctx->seed_rnd);
 112                 free(ctx);
 113                 errno = ENOMEM;
 114                 return NULL;
 115         }
 116         seed = 0;
 117         lock_basic_init(&ctx->qqpipe_lock);
 118         lock_basic_init(&ctx->rrpipe_lock);
 119         lock_basic_init(&ctx->cfglock);
 120         ctx->env = (struct module_env*)calloc(1, sizeof(*ctx->env));
 121         if(!ctx->env) {
 122                 ub_randfree(ctx->seed_rnd);
 123                 free(ctx);
 124                 errno = ENOMEM;
 125                 return NULL;
 126         }
 127         ctx->env->cfg = config_create_forlib();
 128         if(!ctx->env->cfg) {
 129                 free(ctx->env);
 130                 ub_randfree(ctx->seed_rnd);
 131                 free(ctx);
 132                 errno = ENOMEM;
 133                 return NULL;
 134         }
 135         /* init edns_known_options */
 136         if(!edns_known_options_init(ctx->env)) {
 137                 config_delete(ctx->env->cfg);
 138                 free(ctx->env);
 139                 ub_randfree(ctx->seed_rnd);
 140                 free(ctx);
 141                 errno = ENOMEM;
 142                 return NULL;
 143         }
 144         ctx->env->alloc = &ctx->superalloc;
 145         ctx->env->worker = NULL;
 146         ctx->env->need_to_validate = 0;
 147         modstack_init(&ctx->mods);
 148         rbtree_init(&ctx->queries, &context_query_cmp);
 149         return ctx;
 150 }
 151
 152 struct ub_ctx*
 153 ub_ctx_create(void)
 154 {
 155         struct ub_ctx* ctx = ub_ctx_create_nopipe();
 156         if(!ctx)
 157                 return NULL;
 158         if((ctx->qq_pipe = tube_create()) == NULL) {
 159                 int e = errno;
 160                 ub_randfree(ctx->seed_rnd);
 161                 config_delete(ctx->env->cfg);
 162                 modstack_desetup(&ctx->mods, ctx->env);
 163                 edns_known_options_delete(ctx->env);
 164                 free(ctx->env);
 165                 free(ctx);
 166                 errno = e;
 167                 return NULL;
 168         }
 169         if((ctx->rr_pipe = tube_create()) == NULL) {
 170                 int e = errno;
 171                 tube_delete(ctx->qq_pipe);
 172                 ub_randfree(ctx->seed_rnd);
 173                 config_delete(ctx->env->cfg);
 174                 modstack_desetup(&ctx->mods, ctx->env);
 175                 edns_known_options_delete(ctx->env);
 176                 free(ctx->env);
 177                 free(ctx);
 178                 errno = e;
 179                 return NULL;
 180         }
 181         return ctx;
 182 }
 183
 184 struct ub_ctx*
 185 ub_ctx_create_ub_event(struct ub_event_base* ueb)
 186 {
 187         struct ub_ctx* ctx = ub_ctx_create_nopipe();
 188         if(!ctx)
 189                 return NULL;
 190         /* no pipes, but we have the locks to make sure everything works */
 191         ctx->created_bg = 0;
 192         ctx->dothread = 1; /* the processing is in the same process,
 193                 makes ub_cancel and ub_ctx_delete do the right thing */
 194         ctx->event_base = ueb;
 195         return ctx;
 196 }
 197
 198 struct ub_ctx*
 199 ub_ctx_create_event(struct event_base* eb)
 200 {
 201         struct ub_ctx* ctx = ub_ctx_create_nopipe();
 202         if(!ctx)
 203                 return NULL;
 204         /* no pipes, but we have the locks to make sure everything works */
 205         ctx->created_bg = 0;
 206         ctx->dothread = 1; /* the processing is in the same process,
 207                 makes ub_cancel and ub_ctx_delete do the right thing */
 208         ctx->event_base = ub_libevent_event_base(eb);
 209         if (!ctx->event_base) {
 210                 ub_ctx_delete(ctx);
 211                 return NULL;
 212         }
 213         return ctx;
 214 }
 215
 216 /** delete q */
 217 static void
 218 delq(rbnode_type* n, void* ATTR_UNUSED(arg))
 219 {
 220         struct ctx_query* q = (struct ctx_query*)n;
 221         context_query_delete(q);
 222 }
 223
 224 /** stop the bg thread */
 225 static void ub_stop_bg(struct ub_ctx* ctx)
 226 {
 227         /* stop the bg thread */
 228         lock_basic_lock(&ctx->cfglock);
 229         if(ctx->created_bg) {
 230                 uint8_t* msg;
 231                 uint32_t len;
 232                 uint32_t cmd = UB_LIBCMD_QUIT;
 233                 lock_basic_unlock(&ctx->cfglock);
 234                 lock_basic_lock(&ctx->qqpipe_lock);
 235                 (void)tube_write_msg(ctx->qq_pipe, (uint8_t*)&cmd,
 236                         (uint32_t)sizeof(cmd), 0);
 237                 lock_basic_unlock(&ctx->qqpipe_lock);
 238                 lock_basic_lock(&ctx->rrpipe_lock);
 239                 while(tube_read_msg(ctx->rr_pipe, &msg, &len, 0)) {
 240                         /* discard all results except a quit confirm */
 241                         if(context_serial_getcmd(msg, len) == UB_LIBCMD_QUIT) {
 242                                 free(msg);
 243                                 break;
 244                         }
 245                         free(msg);
 246                 }
 247                 lock_basic_unlock(&ctx->rrpipe_lock);
 248
 249                 /* if bg worker is a thread, wait for it to exit, so that all
 250                  * resources are really gone. */
 251                 lock_basic_lock(&ctx->cfglock);
 252                 if(ctx->dothread) {
 253                         lock_basic_unlock(&ctx->cfglock);
 254                         ub_thread_join(ctx->bg_tid);
 255                 } else {
 256                         lock_basic_unlock(&ctx->cfglock);
 257 #ifndef UB_ON_WINDOWS
 258                         if(waitpid(ctx->bg_pid, NULL, 0) == -1) {
 259                                 if(verbosity > 2)
 260                                         log_err("waitpid: %s", strerror(errno));
 261                         }
 262 #endif
 263                 }
 264         }
 265         else {
 266                 lock_basic_unlock(&ctx->cfglock);
 267         }
 268 }
 269
 270 void
 271 ub_ctx_delete(struct ub_ctx* ctx)
 272 {
 273         struct alloc_cache* a, *na;
 274         int do_stop = 1;
 275         if(!ctx) return;
 276
 277         /* see if bg thread is created and if threads have been killed */
 278         /* no locks, because those may be held by terminated threads */
 279         /* for processes the read pipe is closed and we see that on read */
 280 #ifdef HAVE_PTHREAD
 281         if(ctx->created_bg && ctx->dothread) {
 282                 if(pthread_kill(ctx->bg_tid, 0) == ESRCH) {
 283                         /* thread has been killed */
 284                         do_stop = 0;
 285                 }
 286         }
 287 #endif /* HAVE_PTHREAD */
 288         if(do_stop)
 289                 ub_stop_bg(ctx);
 290         libworker_delete_event(ctx->event_worker);
 291
 292         modstack_desetup(&ctx->mods, ctx->env);
 293         a = ctx->alloc_list;
 294         while(a) {
 295                 na = a->super;
 296                 a->super = &ctx->superalloc;
 297                 alloc_clear(a);
 298                 free(a);
 299                 a = na;
 300         }
 301         local_zones_delete(ctx->local_zones);
 302         lock_basic_destroy(&ctx->qqpipe_lock);
 303         lock_basic_destroy(&ctx->rrpipe_lock);
 304         lock_basic_destroy(&ctx->cfglock);
 305         tube_delete(ctx->qq_pipe);
 306         tube_delete(ctx->rr_pipe);
 307         if(ctx->env) {
 308                 slabhash_delete(ctx->env->msg_cache);
 309                 rrset_cache_delete(ctx->env->rrset_cache);
 310                 infra_delete(ctx->env->infra_cache);
 311                 config_delete(ctx->env->cfg);
 312                 edns_known_options_delete(ctx->env);
 313                 free(ctx->env);
 314         }
 315         ub_randfree(ctx->seed_rnd);
 316         alloc_clear(&ctx->superalloc);
 317         traverse_postorder(&ctx->queries, delq, NULL);
 318         free(ctx);
 319 #ifdef USE_WINSOCK
 320         WSACleanup();
 321 #endif
 322 }
 323
 324 int
 325 ub_ctx_set_option(struct ub_ctx* ctx, const char* opt, const char* val)
 326 {
 327         lock_basic_lock(&ctx->cfglock);
 328         if(ctx->finalized) {
 329                 lock_basic_unlock(&ctx->cfglock);
 330                 return UB_AFTERFINAL;
 331         }
 332         if(!config_set_option(ctx->env->cfg, opt, val)) {
 333                 lock_basic_unlock(&ctx->cfglock);
 334                 return UB_SYNTAX;
 335         }
 336         lock_basic_unlock(&ctx->cfglock);
 337         return UB_NOERROR;
 338 }
 339
 340 int
 341 ub_ctx_get_option(struct ub_ctx* ctx, const char* opt, char** str)
 342 {
 343         int r;
 344         lock_basic_lock(&ctx->cfglock);
 345         r = config_get_option_collate(ctx->env->cfg, opt, str);
 346         lock_basic_unlock(&ctx->cfglock);
 347         if(r == 0) r = UB_NOERROR;
 348         else if(r == 1) r = UB_SYNTAX;
 349         else if(r == 2) r = UB_NOMEM;
 350         return r;
 351 }
 352
 353 int
 354 ub_ctx_config(struct ub_ctx* ctx, const char* fname)
 355 {
 356         lock_basic_lock(&ctx->cfglock);
 357         if(ctx->finalized) {
 358                 lock_basic_unlock(&ctx->cfglock);
 359                 return UB_AFTERFINAL;
 360         }
 361         if(!config_read(ctx->env->cfg, fname, NULL)) {
 362                 lock_basic_unlock(&ctx->cfglock);
 363                 return UB_SYNTAX;
 364         }
 365         lock_basic_unlock(&ctx->cfglock);
 366         return UB_NOERROR;
 367 }
 368
 369 int
 370 ub_ctx_add_ta(struct ub_ctx* ctx, const char* ta)
 371 {
 372         char* dup = strdup(ta);
 373         if(!dup) return UB_NOMEM;
 374         lock_basic_lock(&ctx->cfglock);
 375         if(ctx->finalized) {
 376                 lock_basic_unlock(&ctx->cfglock);
 377                 free(dup);
 378                 return UB_AFTERFINAL;
 379         }
 380         if(!cfg_strlist_insert(&ctx->env->cfg->trust_anchor_list, dup)) {
 381                 lock_basic_unlock(&ctx->cfglock);
 382                 free(dup);
 383                 return UB_NOMEM;
 384         }
 385         lock_basic_unlock(&ctx->cfglock);
 386         return UB_NOERROR;
 387 }
 388
 389 int
 390 ub_ctx_add_ta_file(struct ub_ctx* ctx, const char* fname)
 391 {
 392         char* dup = strdup(fname);
 393         if(!dup) return UB_NOMEM;
 394         lock_basic_lock(&ctx->cfglock);
 395         if(ctx->finalized) {
 396                 lock_basic_unlock(&ctx->cfglock);
 397                 free(dup);
 398                 return UB_AFTERFINAL;
 399         }
 400         if(!cfg_strlist_insert(&ctx->env->cfg->trust_anchor_file_list, dup)) {
 401                 lock_basic_unlock(&ctx->cfglock);
 402                 free(dup);
 403                 return UB_NOMEM;
 404         }
 405         lock_basic_unlock(&ctx->cfglock);
 406         return UB_NOERROR;
 407 }
 408
 409 int ub_ctx_add_ta_autr(struct ub_ctx* ctx, const char* fname)
 410 {
 411         char* dup = strdup(fname);
 412         if(!dup) return UB_NOMEM;
 413         lock_basic_lock(&ctx->cfglock);
 414         if(ctx->finalized) {
 415                 lock_basic_unlock(&ctx->cfglock);
 416                 free(dup);
 417                 return UB_AFTERFINAL;
 418         }
 419         if(!cfg_strlist_insert(&ctx->env->cfg->auto_trust_anchor_file_list,
 420                 dup)) {
 421                 lock_basic_unlock(&ctx->cfglock);
 422                 free(dup);
 423                 return UB_NOMEM;
 424         }
 425         lock_basic_unlock(&ctx->cfglock);
 426         return UB_NOERROR;
 427 }
 428
 429 int
 430 ub_ctx_trustedkeys(struct ub_ctx* ctx, const char* fname)
 431 {
 432         char* dup = strdup(fname);
 433         if(!dup) return UB_NOMEM;
 434         lock_basic_lock(&ctx->cfglock);
 435         if(ctx->finalized) {
 436                 lock_basic_unlock(&ctx->cfglock);
 437                 free(dup);
 438                 return UB_AFTERFINAL;
 439         }
 440         if(!cfg_strlist_insert(&ctx->env->cfg->trusted_keys_file_list, dup)) {
 441                 lock_basic_unlock(&ctx->cfglock);
 442                 free(dup);
 443                 return UB_NOMEM;
 444         }
 445         lock_basic_unlock(&ctx->cfglock);
 446         return UB_NOERROR;
 447 }
 448
 449 int
 450 ub_ctx_debuglevel(struct ub_ctx* ctx, int d)
 451 {
 452         lock_basic_lock(&ctx->cfglock);
 453         verbosity = d;
 454         ctx->env->cfg->verbosity = d;
 455         lock_basic_unlock(&ctx->cfglock);
 456         return UB_NOERROR;
 457 }
 458
 459 int ub_ctx_debugout(struct ub_ctx* ctx, void* out)
 460 {
 461         lock_basic_lock(&ctx->cfglock);
 462         log_file((FILE*)out);
 463         ctx->logfile_override = 1;
 464         ctx->log_out = out;
 465         lock_basic_unlock(&ctx->cfglock);
 466         return UB_NOERROR;
 467 }
 468
 469 int
 470 ub_ctx_async(struct ub_ctx* ctx, int dothread)
 471 {
 472 #ifdef THREADS_DISABLED
 473         if(dothread) /* cannot do threading */
 474                 return UB_NOERROR;
 475 #endif
 476         lock_basic_lock(&ctx->cfglock);
 477         if(ctx->finalized) {
 478                 lock_basic_unlock(&ctx->cfglock);
 479                 return UB_AFTERFINAL;
 480         }
 481         ctx->dothread = dothread;
 482         lock_basic_unlock(&ctx->cfglock);
 483         return UB_NOERROR;
 484 }
 485
 486 int
 487 ub_poll(struct ub_ctx* ctx)
 488 {
 489         /* no need to hold lock while testing for readability. */
 490         return tube_poll(ctx->rr_pipe);
 491 }
 492
 493 int
 494 ub_fd(struct ub_ctx* ctx)
 495 {
 496         return tube_read_fd(ctx->rr_pipe);
 497 }
 498
 499 /** process answer from bg worker */
 500 static int
 501 process_answer_detail(struct ub_ctx* ctx, uint8_t* msg, uint32_t len,
 502         ub_callback_type* cb, void** cbarg, int* err,
 503         struct ub_result** res)
 504 {
 505         struct ctx_query* q;
 506         if(context_serial_getcmd(msg, len) != UB_LIBCMD_ANSWER) {
 507                 log_err("error: bad data from bg worker %d",
 508                         (int)context_serial_getcmd(msg, len));
 509                 return 0;
 510         }
 511
 512         lock_basic_lock(&ctx->cfglock);
 513         q = context_deserialize_answer(ctx, msg, len, err);
 514         if(!q) {
 515                 lock_basic_unlock(&ctx->cfglock);
 516                 /* probably simply the lookup that failed, i.e.
 517                  * response returned before cancel was sent out, so noerror */
 518                 return 1;
 519         }
 520         log_assert(q->async);
 521
 522         /* grab cb while locked */
 523         if(q->cancelled) {
 524                 *cb = NULL;
 525                 *cbarg = NULL;
 526         } else {
 527                 *cb = q->cb;
 528                 *cbarg = q->cb_arg;
 529         }
 530         if(*err) {
 531                 *res = NULL;
 532                 ub_resolve_free(q->res);
 533         } else {
 534                 /* parse the message, extract rcode, fill result */
 535                 sldns_buffer* buf = sldns_buffer_new(q->msg_len);
 536                 struct regional* region = regional_create();
 537                 *res = q->res;
 538                 (*res)->rcode = LDNS_RCODE_SERVFAIL;
 539                 if(region && buf) {
 540                         sldns_buffer_clear(buf);
 541                         sldns_buffer_write(buf, q->msg, q->msg_len);
 542                         sldns_buffer_flip(buf);
 543                         libworker_enter_result(*res, buf, region,
 544                                 q->msg_security);
 545                 }
 546                 (*res)->answer_packet = q->msg;
 547                 (*res)->answer_len = (int)q->msg_len;
 548                 q->msg = NULL;
 549                 sldns_buffer_free(buf);
 550                 regional_destroy(region);
 551         }
 552         q->res = NULL;
 553         /* delete the q from list */
 554         (void)rbtree_delete(&ctx->queries, q->node.key);
 555         ctx->num_async--;
 556         context_query_delete(q);
 557         lock_basic_unlock(&ctx->cfglock);
 558
 559         if(*cb) return 2;
 560         ub_resolve_free(*res);
 561         return 1;
 562 }
 563
 564 /** process answer from bg worker */
 565 static int
 566 process_answer(struct ub_ctx* ctx, uint8_t* msg, uint32_t len)
 567 {
 568         int err;
 569         ub_callback_type cb;
 570         void* cbarg;
 571         struct ub_result* res;
 572         int r;
 573
 574         r = process_answer_detail(ctx, msg, len, &cb, &cbarg, &err, &res);
 575
 576         /* no locks held while calling callback, so that library is
 577          * re-entrant. */
 578         if(r == 2)
 579                 (*cb)(cbarg, err, res);
 580
 581         return r;
 582 }
 583
 584 int
 585 ub_process(struct ub_ctx* ctx)
 586 {
 587         int r;
 588         uint8_t* msg;
 589         uint32_t len;
 590         while(1) {
 591                 msg = NULL;
 592                 lock_basic_lock(&ctx->rrpipe_lock);
 593                 r = tube_read_msg(ctx->rr_pipe, &msg, &len, 1);
 594                 lock_basic_unlock(&ctx->rrpipe_lock);
 595                 if(r == 0)
 596                         return UB_PIPE;
 597                 else if(r == -1)
 598                         break;
 599                 if(!process_answer(ctx, msg, len)) {
 600                         free(msg);
 601                         return UB_PIPE;
 602                 }
 603                 free(msg);
 604         }
 605         return UB_NOERROR;
 606 }
 607
 608 int
 609 ub_wait(struct ub_ctx* ctx)
 610 {
 611         int err;
 612         ub_callback_type cb;
 613         void* cbarg;
 614         struct ub_result* res;
 615         int r;
 616         uint8_t* msg;
 617         uint32_t len;
 618         /* this is basically the same loop as _process(), but with changes.
 619          * holds the rrpipe lock and waits with tube_wait */
 620         while(1) {
 621                 lock_basic_lock(&ctx->rrpipe_lock);
 622                 lock_basic_lock(&ctx->cfglock);
 623                 if(ctx->num_async == 0) {
 624                         lock_basic_unlock(&ctx->cfglock);
 625                         lock_basic_unlock(&ctx->rrpipe_lock);
 626                         break;
 627                 }
 628                 lock_basic_unlock(&ctx->cfglock);
 629
 630                 /* keep rrpipe locked, while
 631                  *      o waiting for pipe readable
 632                  *      o parsing message
 633                  *      o possibly decrementing num_async
 634                  * do callback without lock
 635                  */
 636                 r = tube_wait(ctx->rr_pipe);
 637                 if(r) {
 638                         r = tube_read_msg(ctx->rr_pipe, &msg, &len, 1);
 639                         if(r == 0) {
 640                                 lock_basic_unlock(&ctx->rrpipe_lock);
 641                                 return UB_PIPE;
 642                         }
 643                         if(r == -1) {
 644                                 lock_basic_unlock(&ctx->rrpipe_lock);
 645                                 continue;
 646                         }
 647                         r = process_answer_detail(ctx, msg, len,
 648                                 &cb, &cbarg, &err, &res);
 649                         lock_basic_unlock(&ctx->rrpipe_lock);
 650                         free(msg);
 651                         if(r == 0)
 652                                 return UB_PIPE;
 653                         if(r == 2)
 654                                 (*cb)(cbarg, err, res);
 655                 } else {
 656                         lock_basic_unlock(&ctx->rrpipe_lock);
 657                 }
 658         }
 659         return UB_NOERROR;
 660 }
 661
 662 int
 663 ub_resolve(struct ub_ctx* ctx, const char* name, int rrtype,
 664         int rrclass, struct ub_result** result)
 665 {
 666         struct ctx_query* q;
 667         int r;
 668         *result = NULL;
 669
 670         lock_basic_lock(&ctx->cfglock);
 671         if(!ctx->finalized) {
 672                 r = context_finalize(ctx);
 673                 if(r) {
 674                         lock_basic_unlock(&ctx->cfglock);
 675                         return r;
 676                 }
 677         }
 678         /* create new ctx_query and attempt to add to the list */
 679         lock_basic_unlock(&ctx->cfglock);
 680         q = context_new(ctx, name, rrtype, rrclass, NULL, NULL);
 681         if(!q)
 682                 return UB_NOMEM;
 683         /* become a resolver thread for a bit */
 684
 685         r = libworker_fg(ctx, q);
 686         if(r) {
 687                 lock_basic_lock(&ctx->cfglock);
 688                 (void)rbtree_delete(&ctx->queries, q->node.key);
 689                 context_query_delete(q);
 690                 lock_basic_unlock(&ctx->cfglock);
 691                 return r;
 692         }
 693         q->res->answer_packet = q->msg;
 694         q->res->answer_len = (int)q->msg_len;
 695         q->msg = NULL;
 696         *result = q->res;
 697         q->res = NULL;
 698
 699         lock_basic_lock(&ctx->cfglock);
 700         (void)rbtree_delete(&ctx->queries, q->node.key);
 701         context_query_delete(q);
 702         lock_basic_unlock(&ctx->cfglock);
 703         return UB_NOERROR;
 704 }
 705
 706 int
 707 ub_resolve_event(struct ub_ctx* ctx, const char* name, int rrtype,
 708         int rrclass, void* mydata, ub_event_callback_type callback,
 709         int* async_id)
 710 {
 711         struct ctx_query* q;
 712         int r;
 713
 714         if(async_id)
 715                 *async_id = 0;
 716         lock_basic_lock(&ctx->cfglock);
 717         if(!ctx->finalized) {
 718                 int r = context_finalize(ctx);
 719                 if(r) {
 720                         lock_basic_unlock(&ctx->cfglock);
 721                         return r;
 722                 }
 723         }
 724         lock_basic_unlock(&ctx->cfglock);
 725         if(!ctx->event_worker) {
 726                 ctx->event_worker = libworker_create_event(ctx,
 727                         ctx->event_base);
 728                 if(!ctx->event_worker) {
 729                         return UB_INITFAIL;
 730                 }
 731         }
 732
 733         /* set time in case answer comes from cache */
 734         ub_comm_base_now(ctx->event_worker->base);
 735
 736         /* create new ctx_query and attempt to add to the list */
 737         q = context_new(ctx, name, rrtype, rrclass, (ub_callback_type)callback,
 738                 mydata);
 739         if(!q)
 740                 return UB_NOMEM;
 741
 742         /* attach to mesh */
 743         if((r=libworker_attach_mesh(ctx, q, async_id)) != 0)
 744                 return r;
 745         return UB_NOERROR;
 746 }
 747
 748
 749 int
 750 ub_resolve_async(struct ub_ctx* ctx, const char* name, int rrtype,
 751         int rrclass, void* mydata, ub_callback_type callback, int* async_id)
 752 {
 753         struct ctx_query* q;
 754         uint8_t* msg = NULL;
 755         uint32_t len = 0;
 756
 757         if(async_id)
 758                 *async_id = 0;
 759         lock_basic_lock(&ctx->cfglock);
 760         if(!ctx->finalized) {
 761                 int r = context_finalize(ctx);
 762                 if(r) {
 763                         lock_basic_unlock(&ctx->cfglock);
 764                         return r;
 765                 }
 766         }
 767         if(!ctx->created_bg) {
 768                 int r;
 769                 ctx->created_bg = 1;
 770                 lock_basic_unlock(&ctx->cfglock);
 771                 r = libworker_bg(ctx);
 772                 if(r) {
 773                         lock_basic_lock(&ctx->cfglock);
 774                         ctx->created_bg = 0;
 775                         lock_basic_unlock(&ctx->cfglock);
 776                         return r;
 777                 }
 778         } else {
 779                 lock_basic_unlock(&ctx->cfglock);
 780         }
 781
 782         /* create new ctx_query and attempt to add to the list */
 783         q = context_new(ctx, name, rrtype, rrclass, callback, mydata);
 784         if(!q)
 785                 return UB_NOMEM;
 786
 787         /* write over pipe to background worker */
 788         lock_basic_lock(&ctx->cfglock);
 789         msg = context_serialize_new_query(q, &len);
 790         if(!msg) {
 791                 (void)rbtree_delete(&ctx->queries, q->node.key);
 792                 ctx->num_async--;
 793                 context_query_delete(q);
 794                 lock_basic_unlock(&ctx->cfglock);
 795                 return UB_NOMEM;
 796         }
 797         if(async_id)
 798                 *async_id = q->querynum;
 799         lock_basic_unlock(&ctx->cfglock);
 800
 801         lock_basic_lock(&ctx->qqpipe_lock);
 802         if(!tube_write_msg(ctx->qq_pipe, msg, len, 0)) {
 803                 lock_basic_unlock(&ctx->qqpipe_lock);
 804                 free(msg);
 805                 return UB_PIPE;
 806         }
 807         lock_basic_unlock(&ctx->qqpipe_lock);
 808         free(msg);
 809         return UB_NOERROR;
 810 }
 811
 812 int
 813 ub_cancel(struct ub_ctx* ctx, int async_id)
 814 {
 815         struct ctx_query* q;
 816         uint8_t* msg = NULL;
 817         uint32_t len = 0;
 818         lock_basic_lock(&ctx->cfglock);
 819         q = (struct ctx_query*)rbtree_search(&ctx->queries, &async_id);
 820         if(!q || !q->async) {
 821                 /* it is not there, so nothing to do */
 822                 lock_basic_unlock(&ctx->cfglock);
 823                 return UB_NOID;
 824         }
 825         log_assert(q->async);
 826         q->cancelled = 1;
 827
 828         /* delete it */
 829         if(!ctx->dothread) { /* if forked */
 830                 (void)rbtree_delete(&ctx->queries, q->node.key);
 831                 ctx->num_async--;
 832                 msg = context_serialize_cancel(q, &len);
 833                 context_query_delete(q);
 834                 lock_basic_unlock(&ctx->cfglock);
 835                 if(!msg) {
 836                         return UB_NOMEM;
 837                 }
 838                 /* send cancel to background worker */
 839                 lock_basic_lock(&ctx->qqpipe_lock);
 840                 if(!tube_write_msg(ctx->qq_pipe, msg, len, 0)) {
 841                         lock_basic_unlock(&ctx->qqpipe_lock);
 842                         free(msg);
 843                         return UB_PIPE;
 844                 }
 845                 lock_basic_unlock(&ctx->qqpipe_lock);
 846                 free(msg);
 847         } else {
 848                 lock_basic_unlock(&ctx->cfglock);
 849         }
 850         return UB_NOERROR;
 851 }
 852
 853 void
 854 ub_resolve_free(struct ub_result* result)
 855 {
 856         char** p;
 857         if(!result) return;
 858         free(result->qname);
 859         if(result->canonname != result->qname)
 860                 free(result->canonname);
 861         if(result->data)
 862                 for(p = result->data; *p; p++)
 863                         free(*p);
 864         free(result->data);
 865         free(result->len);
 866         free(result->answer_packet);
 867         free(result->why_bogus);
 868         free(result);
 869 }
 870
 871 const char*
 872 ub_strerror(int err)
 873 {
 874         switch(err) {
 875                 case UB_NOERROR: return "no error";
 876                 case UB_SOCKET: return "socket io error";
 877                 case UB_NOMEM: return "out of memory";
 878                 case UB_SYNTAX: return "syntax error";
 879                 case UB_SERVFAIL: return "server failure";
 880                 case UB_FORKFAIL: return "could not fork";
 881                 case UB_INITFAIL: return "initialization failure";
 882                 case UB_AFTERFINAL: return "setting change after finalize";
 883                 case UB_PIPE: return "error in pipe communication with async";
 884                 case UB_READFILE: return "error reading file";
 885                 case UB_NOID: return "error async_id does not exist";
 886                 default: return "unknown error";
 887         }
 888 }
 889
 890 int
 891 ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr)
 892 {
 893         struct sockaddr_storage storage;
 894         socklen_t stlen;
 895         struct config_stub* s;
 896         char* dupl;
 897         lock_basic_lock(&ctx->cfglock);
 898         if(ctx->finalized) {
 899                 lock_basic_unlock(&ctx->cfglock);
 900                 errno=EINVAL;
 901                 return UB_AFTERFINAL;
 902         }
 903         if(!addr) {
 904                 /* disable fwd mode - the root stub should be first. */
 905                 if(ctx->env->cfg->forwards &&
 906                         strcmp(ctx->env->cfg->forwards->name, ".") == 0) {
 907                         s = ctx->env->cfg->forwards;
 908                         ctx->env->cfg->forwards = s->next;
 909                         s->next = NULL;
 910                         config_delstubs(s);
 911                 }
 912                 lock_basic_unlock(&ctx->cfglock);
 913                 return UB_NOERROR;
 914         }
 915         lock_basic_unlock(&ctx->cfglock);
 916
 917         /* check syntax for addr */
 918         if(!extstrtoaddr(addr, &storage, &stlen)) {
 919                 errno=EINVAL;
 920                 return UB_SYNTAX;
 921         }
 922
 923         /* it parses, add root stub in front of list */
 924         lock_basic_lock(&ctx->cfglock);
 925         if(!ctx->env->cfg->forwards ||
 926                 strcmp(ctx->env->cfg->forwards->name, ".") != 0) {
 927                 s = calloc(1, sizeof(*s));
 928                 if(!s) {
 929                         lock_basic_unlock(&ctx->cfglock);
 930                         errno=ENOMEM;
 931                         return UB_NOMEM;
 932                 }
 933                 s->name = strdup(".");
 934                 if(!s->name) {
 935                         free(s);
 936                         lock_basic_unlock(&ctx->cfglock);
 937                         errno=ENOMEM;
 938                         return UB_NOMEM;
 939                 }
 940                 s->next = ctx->env->cfg->forwards;
 941                 ctx->env->cfg->forwards = s;
 942         } else {
 943                 log_assert(ctx->env->cfg->forwards);
 944                 s = ctx->env->cfg->forwards;
 945         }
 946         dupl = strdup(addr);
 947         if(!dupl) {
 948                 lock_basic_unlock(&ctx->cfglock);
 949                 errno=ENOMEM;
 950                 return UB_NOMEM;
 951         }
 952         if(!cfg_strlist_insert(&s->addrs, dupl)) {
 953                 free(dupl);
 954                 lock_basic_unlock(&ctx->cfglock);
 955                 errno=ENOMEM;
 956                 return UB_NOMEM;
 957         }
 958         lock_basic_unlock(&ctx->cfglock);
 959         return UB_NOERROR;
 960 }
 961
 962 int ub_ctx_set_stub(struct ub_ctx* ctx, const char* zone, const char* addr,
 963         int isprime)
 964 {
 965         char* a;
 966         struct config_stub **prev, *elem;
 967
 968         /* check syntax for zone name */
 969         if(zone) {
 970                 uint8_t* nm;
 971                 int nmlabs;
 972                 size_t nmlen;
 973                 if(!parse_dname(zone, &nm, &nmlen, &nmlabs)) {
 974                         errno=EINVAL;
 975                         return UB_SYNTAX;
 976                 }
 977                 free(nm);
 978         } else {
 979                 zone = ".";
 980         }
 981
 982         /* check syntax for addr (if not NULL) */
 983         if(addr) {
 984                 struct sockaddr_storage storage;
 985                 socklen_t stlen;
 986                 if(!extstrtoaddr(addr, &storage, &stlen)) {
 987                         errno=EINVAL;
 988                         return UB_SYNTAX;
 989                 }
 990         }
 991
 992         lock_basic_lock(&ctx->cfglock);
 993         if(ctx->finalized) {
 994                 lock_basic_unlock(&ctx->cfglock);
 995                 errno=EINVAL;
 996                 return UB_AFTERFINAL;
 997         }
 998
 999         /* arguments all right, now find or add the stub */
1000         prev = &ctx->env->cfg->stubs;
1001         elem = cfg_stub_find(&prev, zone);
1002         if(!elem && !addr) {
1003                 /* not found and we want to delete, nothing to do */
1004                 lock_basic_unlock(&ctx->cfglock);
1005                 return UB_NOERROR;
1006         } else if(elem && !addr) {
1007                 /* found, and we want to delete */
1008                 *prev = elem->next;
1009                 config_delstub(elem);
1010                 lock_basic_unlock(&ctx->cfglock);
1011                 return UB_NOERROR;
1012         } else if(!elem) {
1013                 /* not found, create the stub entry */
1014                 elem=(struct config_stub*)calloc(1, sizeof(struct config_stub));
1015                 if(elem) elem->name = strdup(zone);
1016                 if(!elem || !elem->name) {
1017                         free(elem);
1018                         lock_basic_unlock(&ctx->cfglock);
1019                         errno = ENOMEM;
1020                         return UB_NOMEM;
1021                 }
1022                 elem->next = ctx->env->cfg->stubs;
1023                 ctx->env->cfg->stubs = elem;
1024         }
1025
1026         /* add the address to the list and set settings */
1027         elem->isprime = isprime;
1028         a = strdup(addr);
1029         if(!a) {
1030                 lock_basic_unlock(&ctx->cfglock);
1031                 errno = ENOMEM;
1032                 return UB_NOMEM;
1033         }
1034         if(!cfg_strlist_insert(&elem->addrs, a)) {
1035                 lock_basic_unlock(&ctx->cfglock);
1036                 free(a);
1037                 errno = ENOMEM;
1038                 return UB_NOMEM;
1039         }
1040         lock_basic_unlock(&ctx->cfglock);
1041         return UB_NOERROR;
1042 }
1043
1044 int
1045 ub_ctx_resolvconf(struct ub_ctx* ctx, const char* fname)
1046 {
1047         FILE* in;
1048         int numserv = 0;
1049         char buf[1024];
1050         char* parse, *addr;
1051         int r;
1052
1053         if(fname == NULL) {
1054 #if !defined(UB_ON_WINDOWS) || !defined(HAVE_WINDOWS_H)
1055                 fname = "/etc/resolv.conf";
1056 #else
1057                 FIXED_INFO *info;
1058                 ULONG buflen = sizeof(*info);
1059                 IP_ADDR_STRING *ptr;
1060
1061                 info = (FIXED_INFO *) malloc(sizeof (FIXED_INFO));
1062                 if (info == NULL)
1063                         return UB_READFILE;
1064
1065                 if (GetNetworkParams(info, &buflen) == ERROR_BUFFER_OVERFLOW) {
1066                         free(info);
1067                         info = (FIXED_INFO *) malloc(buflen);
1068                         if (info == NULL)
1069                                 return UB_READFILE;
1070                 }
1071
1072                 if (GetNetworkParams(info, &buflen) == NO_ERROR) {
1073                         int retval=0;
1074                         ptr = &(info->DnsServerList);
1075                         while (ptr) {
1076                                 numserv++;
1077                                 if((retval=ub_ctx_set_fwd(ctx,
1078                                         ptr->IpAddress.String))!=0) {
1079                                         free(info);
1080                                         return retval;
1081                                 }
1082                                 ptr = ptr->Next;
1083                         }
1084                         free(info);
1085                         if (numserv==0)
1086                                 return UB_READFILE;
1087                         return UB_NOERROR;
1088                 }
1089                 free(info);
1090                 return UB_READFILE;
1091 #endif /* WINDOWS */
1092         }
1093         in = fopen(fname, "r");
1094         if(!in) {
1095                 /* error in errno! perror(fname) */
1096                 return UB_READFILE;
1097         }
1098         while(fgets(buf, (int)sizeof(buf), in)) {
1099                 buf[sizeof(buf)-1] = 0;
1100                 parse=buf;
1101                 while(*parse == ' ' || *parse == '\t')
1102                         parse++;
1103                 if(strncmp(parse, "nameserver", 10) == 0) {
1104                         numserv++;
1105                         parse += 10; /* skip 'nameserver' */
1106                         /* skip whitespace */
1107                         while(*parse == ' ' || *parse == '\t')
1108                                 parse++;
1109                         addr = parse;
1110                         /* skip [0-9a-fA-F.:]*, i.e. IP4 and IP6 address */
1111                         while(isxdigit((unsigned char)*parse) || *parse=='.' || *parse==':')
1112                                 parse++;
1113                         /* terminate after the address, remove newline */
1114                         *parse = 0;
1115
1116                         if((r = ub_ctx_set_fwd(ctx, addr)) != UB_NOERROR) {
1117                                 fclose(in);
1118                                 return r;
1119                         }
1120                 }
1121         }
1122         fclose(in);
1123         if(numserv == 0) {
1124                 /* from resolv.conf(5) if none given, use localhost */
1125                 return ub_ctx_set_fwd(ctx, "127.0.0.1");
1126         }
1127         return UB_NOERROR;
1128 }
1129
1130 int
1131 ub_ctx_hosts(struct ub_ctx* ctx, const char* fname)
1132 {
1133         FILE* in;
1134         char buf[1024], ldata[1024];
1135         char* parse, *addr, *name, *ins;
1136         lock_basic_lock(&ctx->cfglock);
1137         if(ctx->finalized) {
1138                 lock_basic_unlock(&ctx->cfglock);
1139                 errno=EINVAL;
1140                 return UB_AFTERFINAL;
1141         }
1142         lock_basic_unlock(&ctx->cfglock);
1143         if(fname == NULL) {
1144 #if defined(UB_ON_WINDOWS) && defined(HAVE_WINDOWS_H)
1145                 /*
1146                  * If this is Windows NT/XP/2K it's in
1147                  * %WINDIR%\system32\drivers\etc\hosts.
1148                  * If this is Windows 95/98/Me it's in %WINDIR%\hosts.
1149                  */
1150                 name = getenv("WINDIR");
1151                 if (name != NULL) {
1152                         int retval=0;
1153                         snprintf(buf, sizeof(buf), "%s%s", name,
1154                                 "\\system32\\drivers\\etc\\hosts");
1155                         if((retval=ub_ctx_hosts(ctx, buf)) !=0 ) {
1156                                 snprintf(buf, sizeof(buf), "%s%s", name,
1157                                         "\\hosts");
1158                                 retval=ub_ctx_hosts(ctx, buf);
1159                         }
1160                         return retval;
1161                 }
1162                 return UB_READFILE;
1163 #else
1164                 fname = "/etc/hosts";
1165 #endif /* WIN32 */
1166         }
1167         in = fopen(fname, "r");
1168         if(!in) {
1169                 /* error in errno! perror(fname) */
1170                 return UB_READFILE;
1171         }
1172         while(fgets(buf, (int)sizeof(buf), in)) {
1173                 buf[sizeof(buf)-1] = 0;
1174                 parse=buf;
1175                 while(*parse == ' ' || *parse == '\t')
1176                         parse++;
1177                 if(*parse == '#')
1178                         continue; /* skip comment */
1179                 /* format: <addr> spaces <name> spaces <name> ... */
1180                 addr = parse;
1181                 /* skip addr */
1182                 while(isxdigit((unsigned char)*parse) || *parse == '.' || *parse == ':')
1183                         parse++;
1184                 if(*parse == '\r')
1185                         parse++;
1186                 if(*parse == '\n' || *parse == 0)
1187                         continue;
1188                 if(*parse == '%')
1189                         continue; /* ignore macOSX fe80::1%lo0 localhost */
1190                 if(*parse != ' ' && *parse != '\t') {
1191                         /* must have whitespace after address */
1192                         fclose(in);
1193                         errno=EINVAL;
1194                         return UB_SYNTAX;
1195                 }
1196                 *parse++ = 0; /* end delimiter for addr ... */
1197                 /* go to names and add them */
1198                 while(*parse) {
1199                         while(*parse == ' ' || *parse == '\t' || *parse=='\n'
1200                                 || *parse=='\r')
1201                                 parse++;
1202                         if(*parse == 0 || *parse == '#')
1203                                 break;
1204                         /* skip name, allows (too) many printable characters */
1205                         name = parse;
1206                         while('!' <= *parse && *parse <= '~')
1207                                 parse++;
1208                         if(*parse)
1209                                 *parse++ = 0; /* end delimiter for name */
1210                         snprintf(ldata, sizeof(ldata), "%s %s %s",
1211                                 name, str_is_ip6(addr)?"AAAA":"A", addr);
1212                         ins = strdup(ldata);
1213                         if(!ins) {
1214                                 /* out of memory */
1215                                 fclose(in);
1216                                 errno=ENOMEM;
1217                                 return UB_NOMEM;
1218                         }
1219                         lock_basic_lock(&ctx->cfglock);
1220                         if(!cfg_strlist_insert(&ctx->env->cfg->local_data,
1221                                 ins)) {
1222                                 lock_basic_unlock(&ctx->cfglock);
1223                                 fclose(in);
1224                                 free(ins);
1225                                 errno=ENOMEM;
1226                                 return UB_NOMEM;
1227                         }
1228                         lock_basic_unlock(&ctx->cfglock);
1229                 }
1230         }
1231         fclose(in);
1232         return UB_NOERROR;
1233 }
1234
1235 /** finalize the context, if not already finalized */
1236 static int ub_ctx_finalize(struct ub_ctx* ctx)
1237 {
1238         int res = 0;
1239         lock_basic_lock(&ctx->cfglock);
1240         if (!ctx->finalized) {
1241                 res = context_finalize(ctx);
1242         }
1243         lock_basic_unlock(&ctx->cfglock);
1244         return res;
1245 }
1246
1247 /* Print local zones and RR data */
1248 int ub_ctx_print_local_zones(struct ub_ctx* ctx)
1249 {
1250         int res = ub_ctx_finalize(ctx);
1251         if (res) return res;
1252
1253         local_zones_print(ctx->local_zones);
1254
1255         return UB_NOERROR;
1256 }
1257
1258 /* Add a new zone */
1259 int ub_ctx_zone_add(struct ub_ctx* ctx, const char *zone_name,
1260         const char *zone_type)
1261 {
1262         enum localzone_type t;
1263         struct local_zone* z;
1264         uint8_t* nm;
1265         int nmlabs;
1266         size_t nmlen;
1267
1268         int res = ub_ctx_finalize(ctx);
1269         if (res) return res;
1270
1271         if(!local_zone_str2type(zone_type, &t)) {
1272                 return UB_SYNTAX;
1273         }
1274
1275         if(!parse_dname(zone_name, &nm, &nmlen, &nmlabs)) {
1276                 return UB_SYNTAX;
1277         }
1278
1279         lock_rw_wrlock(&ctx->local_zones->lock);
1280         if((z=local_zones_find(ctx->local_zones, nm, nmlen, nmlabs,
1281                 LDNS_RR_CLASS_IN))) {
1282                 /* already present in tree */
1283                 lock_rw_wrlock(&z->lock);
1284                 z->type = t; /* update type anyway */
1285                 lock_rw_unlock(&z->lock);
1286                 lock_rw_unlock(&ctx->local_zones->lock);
1287                 free(nm);
1288                 return UB_NOERROR;
1289         }
1290         if(!local_zones_add_zone(ctx->local_zones, nm, nmlen, nmlabs,
1291                 LDNS_RR_CLASS_IN, t)) {
1292                 lock_rw_unlock(&ctx->local_zones->lock);
1293                 return UB_NOMEM;
1294         }
1295         lock_rw_unlock(&ctx->local_zones->lock);
1296         return UB_NOERROR;
1297 }
1298
1299 /* Remove zone */
1300 int ub_ctx_zone_remove(struct ub_ctx* ctx, const char *zone_name)
1301 {
1302         struct local_zone* z;
1303         uint8_t* nm;
1304         int nmlabs;
1305         size_t nmlen;
1306
1307         int res = ub_ctx_finalize(ctx);
1308         if (res) return res;
1309
1310         if(!parse_dname(zone_name, &nm, &nmlen, &nmlabs)) {
1311                 return UB_SYNTAX;
1312         }
1313
1314         lock_rw_wrlock(&ctx->local_zones->lock);
1315         if((z=local_zones_find(ctx->local_zones, nm, nmlen, nmlabs,
1316                 LDNS_RR_CLASS_IN))) {
1317                 /* present in tree */
1318                 local_zones_del_zone(ctx->local_zones, z);
1319         }
1320         lock_rw_unlock(&ctx->local_zones->lock);
1321         free(nm);
1322         return UB_NOERROR;
1323 }
1324
1325 /* Add new RR data */
1326 int ub_ctx_data_add(struct ub_ctx* ctx, const char *data)
1327 {
1328         int res = ub_ctx_finalize(ctx);
1329         if (res) return res;
1330
1331         res = local_zones_add_RR(ctx->local_zones, data);
1332         return (!res) ? UB_NOMEM : UB_NOERROR;
1333 }
1334
1335 /* Remove RR data */
1336 int ub_ctx_data_remove(struct ub_ctx* ctx, const char *data)
1337 {
1338         uint8_t* nm;
1339         int nmlabs;
1340         size_t nmlen;
1341         int res = ub_ctx_finalize(ctx);
1342         if (res) return res;
1343
1344         if(!parse_dname(data, &nm, &nmlen, &nmlabs))
1345                 return UB_SYNTAX;
1346
1347         local_zones_del_data(ctx->local_zones, nm, nmlen, nmlabs,
1348                 LDNS_RR_CLASS_IN);
1349
1350         free(nm);
1351         return UB_NOERROR;
1352 }
1353
1354 const char* ub_version(void)
1355 {
1356         return PACKAGE_VERSION;
1357 }
1358
1359 int
1360 ub_ctx_set_event(struct ub_ctx* ctx, struct event_base* base) {
1361         struct ub_event_base* new_base;
1362
1363         if (!ctx || !ctx->event_base || !base) {
1364                 return UB_INITFAIL;
1365         }
1366         if (ub_libevent_get_event_base(ctx->event_base) == base) {
1367                 /* already set */
1368                 return UB_NOERROR;
1369         }
1370
1371         lock_basic_lock(&ctx->cfglock);
1372         /* destroy the current worker - safe to pass in NULL */
1373         libworker_delete_event(ctx->event_worker);
1374         ctx->event_worker = NULL;
1375         new_base = ub_libevent_event_base(base);
1376         if (new_base)
1377                 ctx->event_base = new_base;
1378         ctx->created_bg = 0;
1379         ctx->dothread = 1;
1380         lock_basic_unlock(&ctx->cfglock);
1381         return new_base ? UB_NOERROR : UB_INITFAIL;
1382 }