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. Synchronously 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 "services/authzone.h"
  66 #include "sldns/sbuffer.h"
  67 #ifdef HAVE_PTHREAD
  68 #include <signal.h>
  69 #endif
  70 #ifdef HAVE_SYS_WAIT_H
  71 #include <sys/wait.h>
  72 #endif
  73 #ifdef HAVE_TIME_H
  74 #include <time.h>
  75 #endif
  76
  77 #if defined(UB_ON_WINDOWS) && defined (HAVE_WINDOWS_H)
  78 #include <windows.h>
  79 #include <iphlpapi.h>
  80 #endif /* UB_ON_WINDOWS */
  81
  82 /** create context functionality, but no pipes */
  83 static struct ub_ctx* ub_ctx_create_nopipe(void)
  84 {
  85         struct ub_ctx* ctx;
  86         unsigned int seed;
  87 #ifdef USE_WINSOCK
  88         int r;
  89         WSADATA wsa_data;
  90 #endif
  91
  92         checklock_start();
  93         log_init(NULL, 0, NULL); /* logs to stderr */
  94         log_ident_set("libunbound");
  95 #ifdef USE_WINSOCK
  96         if((r = WSAStartup(MAKEWORD(2,2), &wsa_data)) != 0) {
  97                 log_err("could not init winsock. WSAStartup: %s",
  98                         wsa_strerror(r));
  99                 return NULL;
 100         }
 101 #endif
 102         verbosity = 0; /* errors only */
 103         checklock_start();
 104         ctx = (struct ub_ctx*)calloc(1, sizeof(*ctx));
 105         if(!ctx) {
 106                 errno = ENOMEM;
 107                 return NULL;
 108         }
 109         alloc_init(&ctx->superalloc, NULL, 0);
 110         seed = (unsigned int)time(NULL) ^ (unsigned int)getpid();
 111         if(!(ctx->seed_rnd = ub_initstate(seed, NULL))) {
 112                 seed = 0;
 113                 ub_randfree(ctx->seed_rnd);
 114                 free(ctx);
 115                 errno = ENOMEM;
 116                 return NULL;
 117         }
 118         seed = 0;
 119         lock_basic_init(&ctx->qqpipe_lock);
 120         lock_basic_init(&ctx->rrpipe_lock);
 121         lock_basic_init(&ctx->cfglock);
 122         ctx->env = (struct module_env*)calloc(1, sizeof(*ctx->env));
 123         if(!ctx->env) {
 124                 ub_randfree(ctx->seed_rnd);
 125                 free(ctx);
 126                 errno = ENOMEM;
 127                 return NULL;
 128         }
 129         ctx->env->cfg = config_create_forlib();
 130         if(!ctx->env->cfg) {
 131                 free(ctx->env);
 132                 ub_randfree(ctx->seed_rnd);
 133                 free(ctx);
 134                 errno = ENOMEM;
 135                 return NULL;
 136         }
 137         /* init edns_known_options */
 138         if(!edns_known_options_init(ctx->env)) {
 139                 config_delete(ctx->env->cfg);
 140                 free(ctx->env);
 141                 ub_randfree(ctx->seed_rnd);
 142                 free(ctx);
 143                 errno = ENOMEM;
 144                 return NULL;
 145         }
 146         ctx->env->auth_zones = auth_zones_create();
 147         if(!ctx->env->auth_zones) {
 148                 edns_known_options_delete(ctx->env);
 149                 config_delete(ctx->env->cfg);
 150                 free(ctx->env);
 151                 ub_randfree(ctx->seed_rnd);
 152                 free(ctx);
 153                 errno = ENOMEM;
 154                 return NULL;
 155         }
 156         ctx->env->alloc = &ctx->superalloc;
 157         ctx->env->worker = NULL;
 158         ctx->env->need_to_validate = 0;
 159         modstack_init(&ctx->mods);
 160         rbtree_init(&ctx->queries, &context_query_cmp);
 161         return ctx;
 162 }
 163
 164 struct ub_ctx*
 165 ub_ctx_create(void)
 166 {
 167         struct ub_ctx* ctx = ub_ctx_create_nopipe();
 168         if(!ctx)
 169                 return NULL;
 170         if((ctx->qq_pipe = tube_create()) == NULL) {
 171                 int e = errno;
 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         if((ctx->rr_pipe = tube_create()) == NULL) {
 182                 int e = errno;
 183                 tube_delete(ctx->qq_pipe);
 184                 ub_randfree(ctx->seed_rnd);
 185                 config_delete(ctx->env->cfg);
 186                 modstack_desetup(&ctx->mods, ctx->env);
 187                 edns_known_options_delete(ctx->env);
 188                 free(ctx->env);
 189                 free(ctx);
 190                 errno = e;
 191                 return NULL;
 192         }
 193         return ctx;
 194 }
 195
 196 struct ub_ctx*
 197 ub_ctx_create_ub_event(struct ub_event_base* ueb)
 198 {
 199         struct ub_ctx* ctx = ub_ctx_create_nopipe();
 200         if(!ctx)
 201                 return NULL;
 202         /* no pipes, but we have the locks to make sure everything works */
 203         ctx->created_bg = 0;
 204         ctx->dothread = 1; /* the processing is in the same process,
 205                 makes ub_cancel and ub_ctx_delete do the right thing */
 206         ctx->event_base = ueb;
 207         return ctx;
 208 }
 209
 210 struct ub_ctx*
 211 ub_ctx_create_event(struct event_base* eb)
 212 {
 213         struct ub_ctx* ctx = ub_ctx_create_nopipe();
 214         if(!ctx)
 215                 return NULL;
 216         /* no pipes, but we have the locks to make sure everything works */
 217         ctx->created_bg = 0;
 218         ctx->dothread = 1; /* the processing is in the same process,
 219                 makes ub_cancel and ub_ctx_delete do the right thing */
 220         ctx->event_base = ub_libevent_event_base(eb);
 221         if (!ctx->event_base) {
 222                 ub_ctx_delete(ctx);
 223                 return NULL;
 224         }
 225         return ctx;
 226 }
 227
 228 /** delete q */
 229 static void
 230 delq(rbnode_type* n, void* ATTR_UNUSED(arg))
 231 {
 232         struct ctx_query* q = (struct ctx_query*)n;
 233         context_query_delete(q);
 234 }
 235
 236 /** stop the bg thread */
 237 static void ub_stop_bg(struct ub_ctx* ctx)
 238 {
 239         /* stop the bg thread */
 240         lock_basic_lock(&ctx->cfglock);
 241         if(ctx->created_bg) {
 242                 uint8_t* msg;
 243                 uint32_t len;
 244                 uint32_t cmd = UB_LIBCMD_QUIT;
 245                 lock_basic_unlock(&ctx->cfglock);
 246                 lock_basic_lock(&ctx->qqpipe_lock);
 247                 (void)tube_write_msg(ctx->qq_pipe, (uint8_t*)&cmd,
 248                         (uint32_t)sizeof(cmd), 0);
 249                 lock_basic_unlock(&ctx->qqpipe_lock);
 250                 lock_basic_lock(&ctx->rrpipe_lock);
 251                 while(tube_read_msg(ctx->rr_pipe, &msg, &len, 0)) {
 252                         /* discard all results except a quit confirm */
 253                         if(context_serial_getcmd(msg, len) == UB_LIBCMD_QUIT) {
 254                                 free(msg);
 255                                 break;
 256                         }
 257                         free(msg);
 258                 }
 259                 lock_basic_unlock(&ctx->rrpipe_lock);
 260
 261                 /* if bg worker is a thread, wait for it to exit, so that all
 262                  * resources are really gone. */
 263                 lock_basic_lock(&ctx->cfglock);
 264                 if(ctx->dothread) {
 265                         lock_basic_unlock(&ctx->cfglock);
 266                         ub_thread_join(ctx->bg_tid);
 267                 } else {
 268                         lock_basic_unlock(&ctx->cfglock);
 269 #ifndef UB_ON_WINDOWS
 270                         if(waitpid(ctx->bg_pid, NULL, 0) == -1) {
 271                                 if(verbosity > 2)
 272                                         log_err("waitpid: %s", strerror(errno));
 273                         }
 274 #endif
 275                 }
 276         }
 277         else {
 278                 lock_basic_unlock(&ctx->cfglock);
 279         }
 280 }
 281
 282 void
 283 ub_ctx_delete(struct ub_ctx* ctx)
 284 {
 285         struct alloc_cache* a, *na;
 286         int do_stop = 1;
 287         if(!ctx) return;
 288
 289         /* see if bg thread is created and if threads have been killed */
 290         /* no locks, because those may be held by terminated threads */
 291         /* for processes the read pipe is closed and we see that on read */
 292 #ifdef HAVE_PTHREAD
 293         if(ctx->created_bg && ctx->dothread) {
 294                 if(pthread_kill(ctx->bg_tid, 0) == ESRCH) {
 295                         /* thread has been killed */
 296                         do_stop = 0;
 297                 }
 298         }
 299 #endif /* HAVE_PTHREAD */
 300         if(do_stop)
 301                 ub_stop_bg(ctx);
 302         libworker_delete_event(ctx->event_worker);
 303
 304         modstack_desetup(&ctx->mods, ctx->env);
 305         a = ctx->alloc_list;
 306         while(a) {
 307                 na = a->super;
 308                 a->super = &ctx->superalloc;
 309                 alloc_clear(a);
 310                 free(a);
 311                 a = na;
 312         }
 313         local_zones_delete(ctx->local_zones);
 314         lock_basic_destroy(&ctx->qqpipe_lock);
 315         lock_basic_destroy(&ctx->rrpipe_lock);
 316         lock_basic_destroy(&ctx->cfglock);
 317         tube_delete(ctx->qq_pipe);
 318         tube_delete(ctx->rr_pipe);
 319         if(ctx->env) {
 320                 slabhash_delete(ctx->env->msg_cache);
 321                 rrset_cache_delete(ctx->env->rrset_cache);
 322                 infra_delete(ctx->env->infra_cache);
 323                 config_delete(ctx->env->cfg);
 324                 edns_known_options_delete(ctx->env);
 325                 auth_zones_delete(ctx->env->auth_zones);
 326                 free(ctx->env);
 327         }
 328         ub_randfree(ctx->seed_rnd);
 329         alloc_clear(&ctx->superalloc);
 330         traverse_postorder(&ctx->queries, delq, NULL);
 331         free(ctx);
 332 #ifdef USE_WINSOCK
 333         WSACleanup();
 334 #endif
 335 }
 336
 337 int
 338 ub_ctx_set_option(struct ub_ctx* ctx, const char* opt, const char* val)
 339 {
 340         lock_basic_lock(&ctx->cfglock);
 341         if(ctx->finalized) {
 342                 lock_basic_unlock(&ctx->cfglock);
 343                 return UB_AFTERFINAL;
 344         }
 345         if(!config_set_option(ctx->env->cfg, opt, val)) {
 346                 lock_basic_unlock(&ctx->cfglock);
 347                 return UB_SYNTAX;
 348         }
 349         lock_basic_unlock(&ctx->cfglock);
 350         return UB_NOERROR;
 351 }
 352
 353 int
 354 ub_ctx_get_option(struct ub_ctx* ctx, const char* opt, char** str)
 355 {
 356         int r;
 357         lock_basic_lock(&ctx->cfglock);
 358         r = config_get_option_collate(ctx->env->cfg, opt, str);
 359         lock_basic_unlock(&ctx->cfglock);
 360         if(r == 0) r = UB_NOERROR;
 361         else if(r == 1) r = UB_SYNTAX;
 362         else if(r == 2) r = UB_NOMEM;
 363         return r;
 364 }
 365
 366 int
 367 ub_ctx_config(struct ub_ctx* ctx, const char* fname)
 368 {
 369         lock_basic_lock(&ctx->cfglock);
 370         if(ctx->finalized) {
 371                 lock_basic_unlock(&ctx->cfglock);
 372                 return UB_AFTERFINAL;
 373         }
 374         if(!config_read(ctx->env->cfg, fname, NULL)) {
 375                 lock_basic_unlock(&ctx->cfglock);
 376                 return UB_SYNTAX;
 377         }
 378         lock_basic_unlock(&ctx->cfglock);
 379         return UB_NOERROR;
 380 }
 381
 382 int
 383 ub_ctx_add_ta(struct ub_ctx* ctx, const char* ta)
 384 {
 385         char* dup = strdup(ta);
 386         if(!dup) return UB_NOMEM;
 387         lock_basic_lock(&ctx->cfglock);
 388         if(ctx->finalized) {
 389                 lock_basic_unlock(&ctx->cfglock);
 390                 free(dup);
 391                 return UB_AFTERFINAL;
 392         }
 393         if(!cfg_strlist_insert(&ctx->env->cfg->trust_anchor_list, dup)) {
 394                 lock_basic_unlock(&ctx->cfglock);
 395                 free(dup);
 396                 return UB_NOMEM;
 397         }
 398         lock_basic_unlock(&ctx->cfglock);
 399         return UB_NOERROR;
 400 }
 401
 402 int
 403 ub_ctx_add_ta_file(struct ub_ctx* ctx, const char* fname)
 404 {
 405         char* dup = strdup(fname);
 406         if(!dup) return UB_NOMEM;
 407         lock_basic_lock(&ctx->cfglock);
 408         if(ctx->finalized) {
 409                 lock_basic_unlock(&ctx->cfglock);
 410                 free(dup);
 411                 return UB_AFTERFINAL;
 412         }
 413         if(!cfg_strlist_insert(&ctx->env->cfg->trust_anchor_file_list, dup)) {
 414                 lock_basic_unlock(&ctx->cfglock);
 415                 free(dup);
 416                 return UB_NOMEM;
 417         }
 418         lock_basic_unlock(&ctx->cfglock);
 419         return UB_NOERROR;
 420 }
 421
 422 int ub_ctx_add_ta_autr(struct ub_ctx* ctx, const char* fname)
 423 {
 424         char* dup = strdup(fname);
 425         if(!dup) return UB_NOMEM;
 426         lock_basic_lock(&ctx->cfglock);
 427         if(ctx->finalized) {
 428                 lock_basic_unlock(&ctx->cfglock);
 429                 free(dup);
 430                 return UB_AFTERFINAL;
 431         }
 432         if(!cfg_strlist_insert(&ctx->env->cfg->auto_trust_anchor_file_list,
 433                 dup)) {
 434                 lock_basic_unlock(&ctx->cfglock);
 435                 free(dup);
 436                 return UB_NOMEM;
 437         }
 438         lock_basic_unlock(&ctx->cfglock);
 439         return UB_NOERROR;
 440 }
 441
 442 int
 443 ub_ctx_trustedkeys(struct ub_ctx* ctx, const char* fname)
 444 {
 445         char* dup = strdup(fname);
 446         if(!dup) return UB_NOMEM;
 447         lock_basic_lock(&ctx->cfglock);
 448         if(ctx->finalized) {
 449                 lock_basic_unlock(&ctx->cfglock);
 450                 free(dup);
 451                 return UB_AFTERFINAL;
 452         }
 453         if(!cfg_strlist_insert(&ctx->env->cfg->trusted_keys_file_list, dup)) {
 454                 lock_basic_unlock(&ctx->cfglock);
 455                 free(dup);
 456                 return UB_NOMEM;
 457         }
 458         lock_basic_unlock(&ctx->cfglock);
 459         return UB_NOERROR;
 460 }
 461
 462 int
 463 ub_ctx_debuglevel(struct ub_ctx* ctx, int d)
 464 {
 465         lock_basic_lock(&ctx->cfglock);
 466         verbosity = d;
 467         ctx->env->cfg->verbosity = d;
 468         lock_basic_unlock(&ctx->cfglock);
 469         return UB_NOERROR;
 470 }
 471
 472 int ub_ctx_debugout(struct ub_ctx* ctx, void* out)
 473 {
 474         lock_basic_lock(&ctx->cfglock);
 475         log_file((FILE*)out);
 476         ctx->logfile_override = 1;
 477         ctx->log_out = out;
 478         lock_basic_unlock(&ctx->cfglock);
 479         return UB_NOERROR;
 480 }
 481
 482 int
 483 ub_ctx_async(struct ub_ctx* ctx, int dothread)
 484 {
 485 #ifdef THREADS_DISABLED
 486         if(dothread) /* cannot do threading */
 487                 return UB_NOERROR;
 488 #endif
 489         lock_basic_lock(&ctx->cfglock);
 490         if(ctx->finalized) {
 491                 lock_basic_unlock(&ctx->cfglock);
 492                 return UB_AFTERFINAL;
 493         }
 494         ctx->dothread = dothread;
 495         lock_basic_unlock(&ctx->cfglock);
 496         return UB_NOERROR;
 497 }
 498
 499 int
 500 ub_poll(struct ub_ctx* ctx)
 501 {
 502         /* no need to hold lock while testing for readability. */
 503         return tube_poll(ctx->rr_pipe);
 504 }
 505
 506 int
 507 ub_fd(struct ub_ctx* ctx)
 508 {
 509         return tube_read_fd(ctx->rr_pipe);
 510 }
 511
 512 /** process answer from bg worker */
 513 static int
 514 process_answer_detail(struct ub_ctx* ctx, uint8_t* msg, uint32_t len,
 515         ub_callback_type* cb, void** cbarg, int* err,
 516         struct ub_result** res)
 517 {
 518         struct ctx_query* q;
 519         if(context_serial_getcmd(msg, len) != UB_LIBCMD_ANSWER) {
 520                 log_err("error: bad data from bg worker %d",
 521                         (int)context_serial_getcmd(msg, len));
 522                 return 0;
 523         }
 524
 525         lock_basic_lock(&ctx->cfglock);
 526         q = context_deserialize_answer(ctx, msg, len, err);
 527         if(!q) {
 528                 lock_basic_unlock(&ctx->cfglock);
 529                 /* probably simply the lookup that failed, i.e.
 530                  * response returned before cancel was sent out, so noerror */
 531                 return 1;
 532         }
 533         log_assert(q->async);
 534
 535         /* grab cb while locked */
 536         if(q->cancelled) {
 537                 *cb = NULL;
 538                 *cbarg = NULL;
 539         } else {
 540                 *cb = q->cb;
 541                 *cbarg = q->cb_arg;
 542         }
 543         if(*err) {
 544                 *res = NULL;
 545                 ub_resolve_free(q->res);
 546         } else {
 547                 /* parse the message, extract rcode, fill result */
 548                 sldns_buffer* buf = sldns_buffer_new(q->msg_len);
 549                 struct regional* region = regional_create();
 550                 *res = q->res;
 551                 (*res)->rcode = LDNS_RCODE_SERVFAIL;
 552                 if(region && buf) {
 553                         sldns_buffer_clear(buf);
 554                         sldns_buffer_write(buf, q->msg, q->msg_len);
 555                         sldns_buffer_flip(buf);
 556                         libworker_enter_result(*res, buf, region,
 557                                 q->msg_security);
 558                 }
 559                 (*res)->answer_packet = q->msg;
 560                 (*res)->answer_len = (int)q->msg_len;
 561                 q->msg = NULL;
 562                 sldns_buffer_free(buf);
 563                 regional_destroy(region);
 564         }
 565         q->res = NULL;
 566         /* delete the q from list */
 567         (void)rbtree_delete(&ctx->queries, q->node.key);
 568         ctx->num_async--;
 569         context_query_delete(q);
 570         lock_basic_unlock(&ctx->cfglock);
 571
 572         if(*cb) return 2;
 573         ub_resolve_free(*res);
 574         return 1;
 575 }
 576
 577 /** process answer from bg worker */
 578 static int
 579 process_answer(struct ub_ctx* ctx, uint8_t* msg, uint32_t len)
 580 {
 581         int err;
 582         ub_callback_type cb;
 583         void* cbarg;
 584         struct ub_result* res;
 585         int r;
 586
 587         r = process_answer_detail(ctx, msg, len, &cb, &cbarg, &err, &res);
 588
 589         /* no locks held while calling callback, so that library is
 590          * re-entrant. */
 591         if(r == 2)
 592                 (*cb)(cbarg, err, res);
 593
 594         return r;
 595 }
 596
 597 int
 598 ub_process(struct ub_ctx* ctx)
 599 {
 600         int r;
 601         uint8_t* msg;
 602         uint32_t len;
 603         while(1) {
 604                 msg = NULL;
 605                 lock_basic_lock(&ctx->rrpipe_lock);
 606                 r = tube_read_msg(ctx->rr_pipe, &msg, &len, 1);
 607                 lock_basic_unlock(&ctx->rrpipe_lock);
 608                 if(r == 0)
 609                         return UB_PIPE;
 610                 else if(r == -1)
 611                         break;
 612                 if(!process_answer(ctx, msg, len)) {
 613                         free(msg);
 614                         return UB_PIPE;
 615                 }
 616                 free(msg);
 617         }
 618         return UB_NOERROR;
 619 }
 620
 621 int
 622 ub_wait(struct ub_ctx* ctx)
 623 {
 624         int err;
 625         ub_callback_type cb;
 626         void* cbarg;
 627         struct ub_result* res;
 628         int r;
 629         uint8_t* msg;
 630         uint32_t len;
 631         /* this is basically the same loop as _process(), but with changes.
 632          * holds the rrpipe lock and waits with tube_wait */
 633         while(1) {
 634                 lock_basic_lock(&ctx->rrpipe_lock);
 635                 lock_basic_lock(&ctx->cfglock);
 636                 if(ctx->num_async == 0) {
 637                         lock_basic_unlock(&ctx->cfglock);
 638                         lock_basic_unlock(&ctx->rrpipe_lock);
 639                         break;
 640                 }
 641                 lock_basic_unlock(&ctx->cfglock);
 642
 643                 /* keep rrpipe locked, while
 644                  *      o waiting for pipe readable
 645                  *      o parsing message
 646                  *      o possibly decrementing num_async
 647                  * do callback without lock
 648                  */
 649                 r = tube_wait(ctx->rr_pipe);
 650                 if(r) {
 651                         r = tube_read_msg(ctx->rr_pipe, &msg, &len, 1);
 652                         if(r == 0) {
 653                                 lock_basic_unlock(&ctx->rrpipe_lock);
 654                                 return UB_PIPE;
 655                         }
 656                         if(r == -1) {
 657                                 lock_basic_unlock(&ctx->rrpipe_lock);
 658                                 continue;
 659                         }
 660                         r = process_answer_detail(ctx, msg, len,
 661                                 &cb, &cbarg, &err, &res);
 662                         lock_basic_unlock(&ctx->rrpipe_lock);
 663                         free(msg);
 664                         if(r == 0)
 665                                 return UB_PIPE;
 666                         if(r == 2)
 667                                 (*cb)(cbarg, err, res);
 668                 } else {
 669                         lock_basic_unlock(&ctx->rrpipe_lock);
 670                 }
 671         }
 672         return UB_NOERROR;
 673 }
 674
 675 int
 676 ub_resolve(struct ub_ctx* ctx, const char* name, int rrtype,
 677         int rrclass, struct ub_result** result)
 678 {
 679         struct ctx_query* q;
 680         int r;
 681         *result = NULL;
 682
 683         lock_basic_lock(&ctx->cfglock);
 684         if(!ctx->finalized) {
 685                 r = context_finalize(ctx);
 686                 if(r) {
 687                         lock_basic_unlock(&ctx->cfglock);
 688                         return r;
 689                 }
 690         }
 691         /* create new ctx_query and attempt to add to the list */
 692         lock_basic_unlock(&ctx->cfglock);
 693         q = context_new(ctx, name, rrtype, rrclass, NULL, NULL);
 694         if(!q)
 695                 return UB_NOMEM;
 696         /* become a resolver thread for a bit */
 697
 698         r = libworker_fg(ctx, q);
 699         if(r) {
 700                 lock_basic_lock(&ctx->cfglock);
 701                 (void)rbtree_delete(&ctx->queries, q->node.key);
 702                 context_query_delete(q);
 703                 lock_basic_unlock(&ctx->cfglock);
 704                 return r;
 705         }
 706         q->res->answer_packet = q->msg;
 707         q->res->answer_len = (int)q->msg_len;
 708         q->msg = NULL;
 709         *result = q->res;
 710         q->res = NULL;
 711
 712         lock_basic_lock(&ctx->cfglock);
 713         (void)rbtree_delete(&ctx->queries, q->node.key);
 714         context_query_delete(q);
 715         lock_basic_unlock(&ctx->cfglock);
 716         return UB_NOERROR;
 717 }
 718
 719 int
 720 ub_resolve_event(struct ub_ctx* ctx, const char* name, int rrtype,
 721         int rrclass, void* mydata, ub_event_callback_type callback,
 722         int* async_id)
 723 {
 724         struct ctx_query* q;
 725         int r;
 726
 727         if(async_id)
 728                 *async_id = 0;
 729         lock_basic_lock(&ctx->cfglock);
 730         if(!ctx->finalized) {
 731                 int r = context_finalize(ctx);
 732                 if(r) {
 733                         lock_basic_unlock(&ctx->cfglock);
 734                         return r;
 735                 }
 736         }
 737         lock_basic_unlock(&ctx->cfglock);
 738         if(!ctx->event_worker) {
 739                 ctx->event_worker = libworker_create_event(ctx,
 740                         ctx->event_base);
 741                 if(!ctx->event_worker) {
 742                         return UB_INITFAIL;
 743                 }
 744         }
 745
 746         /* set time in case answer comes from cache */
 747         ub_comm_base_now(ctx->event_worker->base);
 748
 749         /* create new ctx_query and attempt to add to the list */
 750         q = context_new(ctx, name, rrtype, rrclass, (ub_callback_type)callback,
 751                 mydata);
 752         if(!q)
 753                 return UB_NOMEM;
 754
 755         /* attach to mesh */
 756         if((r=libworker_attach_mesh(ctx, q, async_id)) != 0)
 757                 return r;
 758         return UB_NOERROR;
 759 }
 760
 761
 762 int
 763 ub_resolve_async(struct ub_ctx* ctx, const char* name, int rrtype,
 764         int rrclass, void* mydata, ub_callback_type callback, int* async_id)
 765 {
 766         struct ctx_query* q;
 767         uint8_t* msg = NULL;
 768         uint32_t len = 0;
 769
 770         if(async_id)
 771                 *async_id = 0;
 772         lock_basic_lock(&ctx->cfglock);
 773         if(!ctx->finalized) {
 774                 int r = context_finalize(ctx);
 775                 if(r) {
 776                         lock_basic_unlock(&ctx->cfglock);
 777                         return r;
 778                 }
 779         }
 780         if(!ctx->created_bg) {
 781                 int r;
 782                 ctx->created_bg = 1;
 783                 lock_basic_unlock(&ctx->cfglock);
 784                 r = libworker_bg(ctx);
 785                 if(r) {
 786                         lock_basic_lock(&ctx->cfglock);
 787                         ctx->created_bg = 0;
 788                         lock_basic_unlock(&ctx->cfglock);
 789                         return r;
 790                 }
 791         } else {
 792                 lock_basic_unlock(&ctx->cfglock);
 793         }
 794
 795         /* create new ctx_query and attempt to add to the list */
 796         q = context_new(ctx, name, rrtype, rrclass, callback, mydata);
 797         if(!q)
 798                 return UB_NOMEM;
 799
 800         /* write over pipe to background worker */
 801         lock_basic_lock(&ctx->cfglock);
 802         msg = context_serialize_new_query(q, &len);
 803         if(!msg) {
 804                 (void)rbtree_delete(&ctx->queries, q->node.key);
 805                 ctx->num_async--;
 806                 context_query_delete(q);
 807                 lock_basic_unlock(&ctx->cfglock);
 808                 return UB_NOMEM;
 809         }
 810         if(async_id)
 811                 *async_id = q->querynum;
 812         lock_basic_unlock(&ctx->cfglock);
 813
 814         lock_basic_lock(&ctx->qqpipe_lock);
 815         if(!tube_write_msg(ctx->qq_pipe, msg, len, 0)) {
 816                 lock_basic_unlock(&ctx->qqpipe_lock);
 817                 free(msg);
 818                 return UB_PIPE;
 819         }
 820         lock_basic_unlock(&ctx->qqpipe_lock);
 821         free(msg);
 822         return UB_NOERROR;
 823 }
 824
 825 int
 826 ub_cancel(struct ub_ctx* ctx, int async_id)
 827 {
 828         struct ctx_query* q;
 829         uint8_t* msg = NULL;
 830         uint32_t len = 0;
 831         lock_basic_lock(&ctx->cfglock);
 832         q = (struct ctx_query*)rbtree_search(&ctx->queries, &async_id);
 833         if(!q || !q->async) {
 834                 /* it is not there, so nothing to do */
 835                 lock_basic_unlock(&ctx->cfglock);
 836                 return UB_NOID;
 837         }
 838         log_assert(q->async);
 839         q->cancelled = 1;
 840
 841         /* delete it */
 842         if(!ctx->dothread) { /* if forked */
 843                 (void)rbtree_delete(&ctx->queries, q->node.key);
 844                 ctx->num_async--;
 845                 msg = context_serialize_cancel(q, &len);
 846                 context_query_delete(q);
 847                 lock_basic_unlock(&ctx->cfglock);
 848                 if(!msg) {
 849                         return UB_NOMEM;
 850                 }
 851                 /* send cancel to background worker */
 852                 lock_basic_lock(&ctx->qqpipe_lock);
 853                 if(!tube_write_msg(ctx->qq_pipe, msg, len, 0)) {
 854                         lock_basic_unlock(&ctx->qqpipe_lock);
 855                         free(msg);
 856                         return UB_PIPE;
 857                 }
 858                 lock_basic_unlock(&ctx->qqpipe_lock);
 859                 free(msg);
 860         } else {
 861                 lock_basic_unlock(&ctx->cfglock);
 862         }
 863         return UB_NOERROR;
 864 }
 865
 866 void
 867 ub_resolve_free(struct ub_result* result)
 868 {
 869         char** p;
 870         if(!result) return;
 871         free(result->qname);
 872         if(result->canonname != result->qname)
 873                 free(result->canonname);
 874         if(result->data)
 875                 for(p = result->data; *p; p++)
 876                         free(*p);
 877         free(result->data);
 878         free(result->len);
 879         free(result->answer_packet);
 880         free(result->why_bogus);
 881         free(result);
 882 }
 883
 884 const char*
 885 ub_strerror(int err)
 886 {
 887         switch(err) {
 888                 case UB_NOERROR: return "no error";
 889                 case UB_SOCKET: return "socket io error";
 890                 case UB_NOMEM: return "out of memory";
 891                 case UB_SYNTAX: return "syntax error";
 892                 case UB_SERVFAIL: return "server failure";
 893                 case UB_FORKFAIL: return "could not fork";
 894                 case UB_INITFAIL: return "initialization failure";
 895                 case UB_AFTERFINAL: return "setting change after finalize";
 896                 case UB_PIPE: return "error in pipe communication with async";
 897                 case UB_READFILE: return "error reading file";
 898                 case UB_NOID: return "error async_id does not exist";
 899                 default: return "unknown error";
 900         }
 901 }
 902
 903 int
 904 ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr)
 905 {
 906         struct sockaddr_storage storage;
 907         socklen_t stlen;
 908         struct config_stub* s;
 909         char* dupl;
 910         lock_basic_lock(&ctx->cfglock);
 911         if(ctx->finalized) {
 912                 lock_basic_unlock(&ctx->cfglock);
 913                 errno=EINVAL;
 914                 return UB_AFTERFINAL;
 915         }
 916         if(!addr) {
 917                 /* disable fwd mode - the root stub should be first. */
 918                 if(ctx->env->cfg->forwards &&
 919                         strcmp(ctx->env->cfg->forwards->name, ".") == 0) {
 920                         s = ctx->env->cfg->forwards;
 921                         ctx->env->cfg->forwards = s->next;
 922                         s->next = NULL;
 923                         config_delstubs(s);
 924                 }
 925                 lock_basic_unlock(&ctx->cfglock);
 926                 return UB_NOERROR;
 927         }
 928         lock_basic_unlock(&ctx->cfglock);
 929
 930         /* check syntax for addr */
 931         if(!extstrtoaddr(addr, &storage, &stlen)) {
 932                 errno=EINVAL;
 933                 return UB_SYNTAX;
 934         }
 935
 936         /* it parses, add root stub in front of list */
 937         lock_basic_lock(&ctx->cfglock);
 938         if(!ctx->env->cfg->forwards ||
 939                 strcmp(ctx->env->cfg->forwards->name, ".") != 0) {
 940                 s = calloc(1, sizeof(*s));
 941                 if(!s) {
 942                         lock_basic_unlock(&ctx->cfglock);
 943                         errno=ENOMEM;
 944                         return UB_NOMEM;
 945                 }
 946                 s->name = strdup(".");
 947                 if(!s->name) {
 948                         free(s);
 949                         lock_basic_unlock(&ctx->cfglock);
 950                         errno=ENOMEM;
 951                         return UB_NOMEM;
 952                 }
 953                 s->next = ctx->env->cfg->forwards;
 954                 ctx->env->cfg->forwards = s;
 955         } else {
 956                 log_assert(ctx->env->cfg->forwards);
 957                 s = ctx->env->cfg->forwards;
 958         }
 959         dupl = strdup(addr);
 960         if(!dupl) {
 961                 lock_basic_unlock(&ctx->cfglock);
 962                 errno=ENOMEM;
 963                 return UB_NOMEM;
 964         }
 965         if(!cfg_strlist_insert(&s->addrs, dupl)) {
 966                 free(dupl);
 967                 lock_basic_unlock(&ctx->cfglock);
 968                 errno=ENOMEM;
 969                 return UB_NOMEM;
 970         }
 971         lock_basic_unlock(&ctx->cfglock);
 972         return UB_NOERROR;
 973 }
 974
 975 int ub_ctx_set_stub(struct ub_ctx* ctx, const char* zone, const char* addr,
 976         int isprime)
 977 {
 978         char* a;
 979         struct config_stub **prev, *elem;
 980
 981         /* check syntax for zone name */
 982         if(zone) {
 983                 uint8_t* nm;
 984                 int nmlabs;
 985                 size_t nmlen;
 986                 if(!parse_dname(zone, &nm, &nmlen, &nmlabs)) {
 987                         errno=EINVAL;
 988                         return UB_SYNTAX;
 989                 }
 990                 free(nm);
 991         } else {
 992                 zone = ".";
 993         }
 994
 995         /* check syntax for addr (if not NULL) */
 996         if(addr) {
 997                 struct sockaddr_storage storage;
 998                 socklen_t stlen;
 999                 if(!extstrtoaddr(addr, &storage, &stlen)) {
1000                         errno=EINVAL;
1001                         return UB_SYNTAX;
1002                 }
1003         }
1004
1005         lock_basic_lock(&ctx->cfglock);
1006         if(ctx->finalized) {
1007                 lock_basic_unlock(&ctx->cfglock);
1008                 errno=EINVAL;
1009                 return UB_AFTERFINAL;
1010         }
1011
1012         /* arguments all right, now find or add the stub */
1013         prev = &ctx->env->cfg->stubs;
1014         elem = cfg_stub_find(&prev, zone);
1015         if(!elem && !addr) {
1016                 /* not found and we want to delete, nothing to do */
1017                 lock_basic_unlock(&ctx->cfglock);
1018                 return UB_NOERROR;
1019         } else if(elem && !addr) {
1020                 /* found, and we want to delete */
1021                 *prev = elem->next;
1022                 config_delstub(elem);
1023                 lock_basic_unlock(&ctx->cfglock);
1024                 return UB_NOERROR;
1025         } else if(!elem) {
1026                 /* not found, create the stub entry */
1027                 elem=(struct config_stub*)calloc(1, sizeof(struct config_stub));
1028                 if(elem) elem->name = strdup(zone);
1029                 if(!elem || !elem->name) {
1030                         free(elem);
1031                         lock_basic_unlock(&ctx->cfglock);
1032                         errno = ENOMEM;
1033                         return UB_NOMEM;
1034                 }
1035                 elem->next = ctx->env->cfg->stubs;
1036                 ctx->env->cfg->stubs = elem;
1037         }
1038
1039         /* add the address to the list and set settings */
1040         elem->isprime = isprime;
1041         a = strdup(addr);
1042         if(!a) {
1043                 lock_basic_unlock(&ctx->cfglock);
1044                 errno = ENOMEM;
1045                 return UB_NOMEM;
1046         }
1047         if(!cfg_strlist_insert(&elem->addrs, a)) {
1048                 lock_basic_unlock(&ctx->cfglock);
1049                 free(a);
1050                 errno = ENOMEM;
1051                 return UB_NOMEM;
1052         }
1053         lock_basic_unlock(&ctx->cfglock);
1054         return UB_NOERROR;
1055 }
1056
1057 int
1058 ub_ctx_resolvconf(struct ub_ctx* ctx, const char* fname)
1059 {
1060         FILE* in;
1061         int numserv = 0;
1062         char buf[1024];
1063         char* parse, *addr;
1064         int r;
1065
1066         if(fname == NULL) {
1067 #if !defined(UB_ON_WINDOWS) || !defined(HAVE_WINDOWS_H)
1068                 fname = "/etc/resolv.conf";
1069 #else
1070                 FIXED_INFO *info;
1071                 ULONG buflen = sizeof(*info);
1072                 IP_ADDR_STRING *ptr;
1073
1074                 info = (FIXED_INFO *) malloc(sizeof (FIXED_INFO));
1075                 if (info == NULL)
1076                         return UB_READFILE;
1077
1078                 if (GetNetworkParams(info, &buflen) == ERROR_BUFFER_OVERFLOW) {
1079                         free(info);
1080                         info = (FIXED_INFO *) malloc(buflen);
1081                         if (info == NULL)
1082                                 return UB_READFILE;
1083                 }
1084
1085                 if (GetNetworkParams(info, &buflen) == NO_ERROR) {
1086                         int retval=0;
1087                         ptr = &(info->DnsServerList);
1088                         while (ptr) {
1089                                 numserv++;
1090                                 if((retval=ub_ctx_set_fwd(ctx,
1091                                         ptr->IpAddress.String))!=0) {
1092                                         free(info);
1093                                         return retval;
1094                                 }
1095                                 ptr = ptr->Next;
1096                         }
1097                         free(info);
1098                         if (numserv==0)
1099                                 return UB_READFILE;
1100                         return UB_NOERROR;
1101                 }
1102                 free(info);
1103                 return UB_READFILE;
1104 #endif /* WINDOWS */
1105         }
1106         in = fopen(fname, "r");
1107         if(!in) {
1108                 /* error in errno! perror(fname) */
1109                 return UB_READFILE;
1110         }
1111         while(fgets(buf, (int)sizeof(buf), in)) {
1112                 buf[sizeof(buf)-1] = 0;
1113                 parse=buf;
1114                 while(*parse == ' ' || *parse == '\t')
1115                         parse++;
1116                 if(strncmp(parse, "nameserver", 10) == 0) {
1117                         numserv++;
1118                         parse += 10; /* skip 'nameserver' */
1119                         /* skip whitespace */
1120                         while(*parse == ' ' || *parse == '\t')
1121                                 parse++;
1122                         addr = parse;
1123                         /* skip [0-9a-fA-F.:]*, i.e. IP4 and IP6 address */
1124                         while(isxdigit((unsigned char)*parse) || *parse=='.' || *parse==':')
1125                                 parse++;
1126                         /* terminate after the address, remove newline */
1127                         *parse = 0;
1128
1129                         if((r = ub_ctx_set_fwd(ctx, addr)) != UB_NOERROR) {
1130                                 fclose(in);
1131                                 return r;
1132                         }
1133                 }
1134         }
1135         fclose(in);
1136         if(numserv == 0) {
1137                 /* from resolv.conf(5) if none given, use localhost */
1138                 return ub_ctx_set_fwd(ctx, "127.0.0.1");
1139         }
1140         return UB_NOERROR;
1141 }
1142
1143 int
1144 ub_ctx_hosts(struct ub_ctx* ctx, const char* fname)
1145 {
1146         FILE* in;
1147         char buf[1024], ldata[1024];
1148         char* parse, *addr, *name, *ins;
1149         lock_basic_lock(&ctx->cfglock);
1150         if(ctx->finalized) {
1151                 lock_basic_unlock(&ctx->cfglock);
1152                 errno=EINVAL;
1153                 return UB_AFTERFINAL;
1154         }
1155         lock_basic_unlock(&ctx->cfglock);
1156         if(fname == NULL) {
1157 #if defined(UB_ON_WINDOWS) && defined(HAVE_WINDOWS_H)
1158                 /*
1159                  * If this is Windows NT/XP/2K it's in
1160                  * %WINDIR%\system32\drivers\etc\hosts.
1161                  * If this is Windows 95/98/Me it's in %WINDIR%\hosts.
1162                  */
1163                 name = getenv("WINDIR");
1164                 if (name != NULL) {
1165                         int retval=0;
1166                         snprintf(buf, sizeof(buf), "%s%s", name,
1167                                 "\\system32\\drivers\\etc\\hosts");
1168                         if((retval=ub_ctx_hosts(ctx, buf)) !=0 ) {
1169                                 snprintf(buf, sizeof(buf), "%s%s", name,
1170                                         "\\hosts");
1171                                 retval=ub_ctx_hosts(ctx, buf);
1172                         }
1173                         return retval;
1174                 }
1175                 return UB_READFILE;
1176 #else
1177                 fname = "/etc/hosts";
1178 #endif /* WIN32 */
1179         }
1180         in = fopen(fname, "r");
1181         if(!in) {
1182                 /* error in errno! perror(fname) */
1183                 return UB_READFILE;
1184         }
1185         while(fgets(buf, (int)sizeof(buf), in)) {
1186                 buf[sizeof(buf)-1] = 0;
1187                 parse=buf;
1188                 while(*parse == ' ' || *parse == '\t')
1189                         parse++;
1190                 if(*parse == '#')
1191                         continue; /* skip comment */
1192                 /* format: <addr> spaces <name> spaces <name> ... */
1193                 addr = parse;
1194                 /* skip addr */
1195                 while(isxdigit((unsigned char)*parse) || *parse == '.' || *parse == ':')
1196                         parse++;
1197                 if(*parse == '\r')
1198                         parse++;
1199                 if(*parse == '\n' || *parse == 0)
1200                         continue;
1201                 if(*parse == '%')
1202                         continue; /* ignore macOSX fe80::1%lo0 localhost */
1203                 if(*parse != ' ' && *parse != '\t') {
1204                         /* must have whitespace after address */
1205                         fclose(in);
1206                         errno=EINVAL;
1207                         return UB_SYNTAX;
1208                 }
1209                 *parse++ = 0; /* end delimiter for addr ... */
1210                 /* go to names and add them */
1211                 while(*parse) {
1212                         while(*parse == ' ' || *parse == '\t' || *parse=='\n'
1213                                 || *parse=='\r')
1214                                 parse++;
1215                         if(*parse == 0 || *parse == '#')
1216                                 break;
1217                         /* skip name, allows (too) many printable characters */
1218                         name = parse;
1219                         while('!' <= *parse && *parse <= '~')
1220                                 parse++;
1221                         if(*parse)
1222                                 *parse++ = 0; /* end delimiter for name */
1223                         snprintf(ldata, sizeof(ldata), "%s %s %s",
1224                                 name, str_is_ip6(addr)?"AAAA":"A", addr);
1225                         ins = strdup(ldata);
1226                         if(!ins) {
1227                                 /* out of memory */
1228                                 fclose(in);
1229                                 errno=ENOMEM;
1230                                 return UB_NOMEM;
1231                         }
1232                         lock_basic_lock(&ctx->cfglock);
1233                         if(!cfg_strlist_insert(&ctx->env->cfg->local_data,
1234                                 ins)) {
1235                                 lock_basic_unlock(&ctx->cfglock);
1236                                 fclose(in);
1237                                 free(ins);
1238                                 errno=ENOMEM;
1239                                 return UB_NOMEM;
1240                         }
1241                         lock_basic_unlock(&ctx->cfglock);
1242                 }
1243         }
1244         fclose(in);
1245         return UB_NOERROR;
1246 }
1247
1248 /** finalize the context, if not already finalized */
1249 static int ub_ctx_finalize(struct ub_ctx* ctx)
1250 {
1251         int res = 0;
1252         lock_basic_lock(&ctx->cfglock);
1253         if (!ctx->finalized) {
1254                 res = context_finalize(ctx);
1255         }
1256         lock_basic_unlock(&ctx->cfglock);
1257         return res;
1258 }
1259
1260 /* Print local zones and RR data */
1261 int ub_ctx_print_local_zones(struct ub_ctx* ctx)
1262 {
1263         int res = ub_ctx_finalize(ctx);
1264         if (res) return res;
1265
1266         local_zones_print(ctx->local_zones);
1267
1268         return UB_NOERROR;
1269 }
1270
1271 /* Add a new zone */
1272 int ub_ctx_zone_add(struct ub_ctx* ctx, const char *zone_name,
1273         const char *zone_type)
1274 {
1275         enum localzone_type t;
1276         struct local_zone* z;
1277         uint8_t* nm;
1278         int nmlabs;
1279         size_t nmlen;
1280
1281         int res = ub_ctx_finalize(ctx);
1282         if (res) return res;
1283
1284         if(!local_zone_str2type(zone_type, &t)) {
1285                 return UB_SYNTAX;
1286         }
1287
1288         if(!parse_dname(zone_name, &nm, &nmlen, &nmlabs)) {
1289                 return UB_SYNTAX;
1290         }
1291
1292         lock_rw_wrlock(&ctx->local_zones->lock);
1293         if((z=local_zones_find(ctx->local_zones, nm, nmlen, nmlabs,
1294                 LDNS_RR_CLASS_IN))) {
1295                 /* already present in tree */
1296                 lock_rw_wrlock(&z->lock);
1297                 z->type = t; /* update type anyway */
1298                 lock_rw_unlock(&z->lock);
1299                 lock_rw_unlock(&ctx->local_zones->lock);
1300                 free(nm);
1301                 return UB_NOERROR;
1302         }
1303         if(!local_zones_add_zone(ctx->local_zones, nm, nmlen, nmlabs,
1304                 LDNS_RR_CLASS_IN, t)) {
1305                 lock_rw_unlock(&ctx->local_zones->lock);
1306                 return UB_NOMEM;
1307         }
1308         lock_rw_unlock(&ctx->local_zones->lock);
1309         return UB_NOERROR;
1310 }
1311
1312 /* Remove zone */
1313 int ub_ctx_zone_remove(struct ub_ctx* ctx, const char *zone_name)
1314 {
1315         struct local_zone* z;
1316         uint8_t* nm;
1317         int nmlabs;
1318         size_t nmlen;
1319
1320         int res = ub_ctx_finalize(ctx);
1321         if (res) return res;
1322
1323         if(!parse_dname(zone_name, &nm, &nmlen, &nmlabs)) {
1324                 return UB_SYNTAX;
1325         }
1326
1327         lock_rw_wrlock(&ctx->local_zones->lock);
1328         if((z=local_zones_find(ctx->local_zones, nm, nmlen, nmlabs,
1329                 LDNS_RR_CLASS_IN))) {
1330                 /* present in tree */
1331                 local_zones_del_zone(ctx->local_zones, z);
1332         }
1333         lock_rw_unlock(&ctx->local_zones->lock);
1334         free(nm);
1335         return UB_NOERROR;
1336 }
1337
1338 /* Add new RR data */
1339 int ub_ctx_data_add(struct ub_ctx* ctx, const char *data)
1340 {
1341         int res = ub_ctx_finalize(ctx);
1342         if (res) return res;
1343
1344         res = local_zones_add_RR(ctx->local_zones, data);
1345         return (!res) ? UB_NOMEM : UB_NOERROR;
1346 }
1347
1348 /* Remove RR data */
1349 int ub_ctx_data_remove(struct ub_ctx* ctx, const char *data)
1350 {
1351         uint8_t* nm;
1352         int nmlabs;
1353         size_t nmlen;
1354         int res = ub_ctx_finalize(ctx);
1355         if (res) return res;
1356
1357         if(!parse_dname(data, &nm, &nmlen, &nmlabs))
1358                 return UB_SYNTAX;
1359
1360         local_zones_del_data(ctx->local_zones, nm, nmlen, nmlabs,
1361                 LDNS_RR_CLASS_IN);
1362
1363         free(nm);
1364         return UB_NOERROR;
1365 }
1366
1367 const char* ub_version(void)
1368 {
1369         return PACKAGE_VERSION;
1370 }
1371
1372 int
1373 ub_ctx_set_event(struct ub_ctx* ctx, struct event_base* base) {
1374         struct ub_event_base* new_base;
1375
1376         if (!ctx || !ctx->event_base || !base) {
1377                 return UB_INITFAIL;
1378         }
1379         if (ub_libevent_get_event_base(ctx->event_base) == base) {
1380                 /* already set */
1381                 return UB_NOERROR;
1382         }
1383
1384         lock_basic_lock(&ctx->cfglock);
1385         /* destroy the current worker - safe to pass in NULL */
1386         libworker_delete_event(ctx->event_worker);
1387         ctx->event_worker = NULL;
1388         new_base = ub_libevent_event_base(base);
1389         if (new_base)
1390                 ctx->event_base = new_base;
1391         ctx->created_bg = 0;
1392         ctx->dothread = 1;
1393         lock_basic_unlock(&ctx->cfglock);
1394         return new_base ? UB_NOERROR : UB_INITFAIL;
1395 }