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, 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, NULL, callback, mydata);
 751         if(!q)
 752                 return UB_NOMEM;
 753
 754         /* attach to mesh */
 755         if((r=libworker_attach_mesh(ctx, q, async_id)) != 0)
 756                 return r;
 757         return UB_NOERROR;
 758 }
 759
 760
 761 int
 762 ub_resolve_async(struct ub_ctx* ctx, const char* name, int rrtype,
 763         int rrclass, void* mydata, ub_callback_type callback, int* async_id)
 764 {
 765         struct ctx_query* q;
 766         uint8_t* msg = NULL;
 767         uint32_t len = 0;
 768
 769         if(async_id)
 770                 *async_id = 0;
 771         lock_basic_lock(&ctx->cfglock);
 772         if(!ctx->finalized) {
 773                 int r = context_finalize(ctx);
 774                 if(r) {
 775                         lock_basic_unlock(&ctx->cfglock);
 776                         return r;
 777                 }
 778         }
 779         if(!ctx->created_bg) {
 780                 int r;
 781                 ctx->created_bg = 1;
 782                 lock_basic_unlock(&ctx->cfglock);
 783                 r = libworker_bg(ctx);
 784                 if(r) {
 785                         lock_basic_lock(&ctx->cfglock);
 786                         ctx->created_bg = 0;
 787                         lock_basic_unlock(&ctx->cfglock);
 788                         return r;
 789                 }
 790         } else {
 791                 lock_basic_unlock(&ctx->cfglock);
 792         }
 793
 794         /* create new ctx_query and attempt to add to the list */
 795         q = context_new(ctx, name, rrtype, rrclass, callback, NULL, mydata);
 796         if(!q)
 797                 return UB_NOMEM;
 798
 799         /* write over pipe to background worker */
 800         lock_basic_lock(&ctx->cfglock);
 801         msg = context_serialize_new_query(q, &len);
 802         if(!msg) {
 803                 (void)rbtree_delete(&ctx->queries, q->node.key);
 804                 ctx->num_async--;
 805                 context_query_delete(q);
 806                 lock_basic_unlock(&ctx->cfglock);
 807                 return UB_NOMEM;
 808         }
 809         if(async_id)
 810                 *async_id = q->querynum;
 811         lock_basic_unlock(&ctx->cfglock);
 812
 813         lock_basic_lock(&ctx->qqpipe_lock);
 814         if(!tube_write_msg(ctx->qq_pipe, msg, len, 0)) {
 815                 lock_basic_unlock(&ctx->qqpipe_lock);
 816                 free(msg);
 817                 return UB_PIPE;
 818         }
 819         lock_basic_unlock(&ctx->qqpipe_lock);
 820         free(msg);
 821         return UB_NOERROR;
 822 }
 823
 824 int
 825 ub_cancel(struct ub_ctx* ctx, int async_id)
 826 {
 827         struct ctx_query* q;
 828         uint8_t* msg = NULL;
 829         uint32_t len = 0;
 830         lock_basic_lock(&ctx->cfglock);
 831         q = (struct ctx_query*)rbtree_search(&ctx->queries, &async_id);
 832         if(!q || !q->async) {
 833                 /* it is not there, so nothing to do */
 834                 lock_basic_unlock(&ctx->cfglock);
 835                 return UB_NOID;
 836         }
 837         log_assert(q->async);
 838         q->cancelled = 1;
 839
 840         /* delete it */
 841         if(!ctx->dothread) { /* if forked */
 842                 (void)rbtree_delete(&ctx->queries, q->node.key);
 843                 ctx->num_async--;
 844                 msg = context_serialize_cancel(q, &len);
 845                 context_query_delete(q);
 846                 lock_basic_unlock(&ctx->cfglock);
 847                 if(!msg) {
 848                         return UB_NOMEM;
 849                 }
 850                 /* send cancel to background worker */
 851                 lock_basic_lock(&ctx->qqpipe_lock);
 852                 if(!tube_write_msg(ctx->qq_pipe, msg, len, 0)) {
 853                         lock_basic_unlock(&ctx->qqpipe_lock);
 854                         free(msg);
 855                         return UB_PIPE;
 856                 }
 857                 lock_basic_unlock(&ctx->qqpipe_lock);
 858                 free(msg);
 859         } else {
 860                 lock_basic_unlock(&ctx->cfglock);
 861         }
 862         return UB_NOERROR;
 863 }
 864
 865 void
 866 ub_resolve_free(struct ub_result* result)
 867 {
 868         char** p;
 869         if(!result) return;
 870         free(result->qname);
 871         if(result->canonname != result->qname)
 872                 free(result->canonname);
 873         if(result->data)
 874                 for(p = result->data; *p; p++)
 875                         free(*p);
 876         free(result->data);
 877         free(result->len);
 878         free(result->answer_packet);
 879         free(result->why_bogus);
 880         free(result);
 881 }
 882
 883 const char*
 884 ub_strerror(int err)
 885 {
 886         switch(err) {
 887                 case UB_NOERROR: return "no error";
 888                 case UB_SOCKET: return "socket io error";
 889                 case UB_NOMEM: return "out of memory";
 890                 case UB_SYNTAX: return "syntax error";
 891                 case UB_SERVFAIL: return "server failure";
 892                 case UB_FORKFAIL: return "could not fork";
 893                 case UB_INITFAIL: return "initialization failure";
 894                 case UB_AFTERFINAL: return "setting change after finalize";
 895                 case UB_PIPE: return "error in pipe communication with async";
 896                 case UB_READFILE: return "error reading file";
 897                 case UB_NOID: return "error async_id does not exist";
 898                 default: return "unknown error";
 899         }
 900 }
 901
 902 int
 903 ub_ctx_set_fwd(struct ub_ctx* ctx, const char* addr)
 904 {
 905         struct sockaddr_storage storage;
 906         socklen_t stlen;
 907         struct config_stub* s;
 908         char* dupl;
 909         lock_basic_lock(&ctx->cfglock);
 910         if(ctx->finalized) {
 911                 lock_basic_unlock(&ctx->cfglock);
 912                 errno=EINVAL;
 913                 return UB_AFTERFINAL;
 914         }
 915         if(!addr) {
 916                 /* disable fwd mode - the root stub should be first. */
 917                 if(ctx->env->cfg->forwards &&
 918                         strcmp(ctx->env->cfg->forwards->name, ".") == 0) {
 919                         s = ctx->env->cfg->forwards;
 920                         ctx->env->cfg->forwards = s->next;
 921                         s->next = NULL;
 922                         config_delstubs(s);
 923                 }
 924                 lock_basic_unlock(&ctx->cfglock);
 925                 return UB_NOERROR;
 926         }
 927         lock_basic_unlock(&ctx->cfglock);
 928
 929         /* check syntax for addr */
 930         if(!extstrtoaddr(addr, &storage, &stlen)) {
 931                 errno=EINVAL;
 932                 return UB_SYNTAX;
 933         }
 934
 935         /* it parses, add root stub in front of list */
 936         lock_basic_lock(&ctx->cfglock);
 937         if(!ctx->env->cfg->forwards ||
 938                 strcmp(ctx->env->cfg->forwards->name, ".") != 0) {
 939                 s = calloc(1, sizeof(*s));
 940                 if(!s) {
 941                         lock_basic_unlock(&ctx->cfglock);
 942                         errno=ENOMEM;
 943                         return UB_NOMEM;
 944                 }
 945                 s->name = strdup(".");
 946                 if(!s->name) {
 947                         free(s);
 948                         lock_basic_unlock(&ctx->cfglock);
 949                         errno=ENOMEM;
 950                         return UB_NOMEM;
 951                 }
 952                 s->next = ctx->env->cfg->forwards;
 953                 ctx->env->cfg->forwards = s;
 954         } else {
 955                 log_assert(ctx->env->cfg->forwards);
 956                 s = ctx->env->cfg->forwards;
 957         }
 958         dupl = strdup(addr);
 959         if(!dupl) {
 960                 lock_basic_unlock(&ctx->cfglock);
 961                 errno=ENOMEM;
 962                 return UB_NOMEM;
 963         }
 964         if(!cfg_strlist_insert(&s->addrs, dupl)) {
 965                 free(dupl);
 966                 lock_basic_unlock(&ctx->cfglock);
 967                 errno=ENOMEM;
 968                 return UB_NOMEM;
 969         }
 970         lock_basic_unlock(&ctx->cfglock);
 971         return UB_NOERROR;
 972 }
 973
 974 int ub_ctx_set_stub(struct ub_ctx* ctx, const char* zone, const char* addr,
 975         int isprime)
 976 {
 977         char* a;
 978         struct config_stub **prev, *elem;
 979
 980         /* check syntax for zone name */
 981         if(zone) {
 982                 uint8_t* nm;
 983                 int nmlabs;
 984                 size_t nmlen;
 985                 if(!parse_dname(zone, &nm, &nmlen, &nmlabs)) {
 986                         errno=EINVAL;
 987                         return UB_SYNTAX;
 988                 }
 989                 free(nm);
 990         } else {
 991                 zone = ".";
 992         }
 993
 994         /* check syntax for addr (if not NULL) */
 995         if(addr) {
 996                 struct sockaddr_storage storage;
 997                 socklen_t stlen;
 998                 if(!extstrtoaddr(addr, &storage, &stlen)) {
 999                         errno=EINVAL;
1000                         return UB_SYNTAX;
1001                 }
1002         }
1003
1004         lock_basic_lock(&ctx->cfglock);
1005         if(ctx->finalized) {
1006                 lock_basic_unlock(&ctx->cfglock);
1007                 errno=EINVAL;
1008                 return UB_AFTERFINAL;
1009         }
1010
1011         /* arguments all right, now find or add the stub */
1012         prev = &ctx->env->cfg->stubs;
1013         elem = cfg_stub_find(&prev, zone);
1014         if(!elem && !addr) {
1015                 /* not found and we want to delete, nothing to do */
1016                 lock_basic_unlock(&ctx->cfglock);
1017                 return UB_NOERROR;
1018         } else if(elem && !addr) {
1019                 /* found, and we want to delete */
1020                 *prev = elem->next;
1021                 config_delstub(elem);
1022                 lock_basic_unlock(&ctx->cfglock);
1023                 return UB_NOERROR;
1024         } else if(!elem) {
1025                 /* not found, create the stub entry */
1026                 elem=(struct config_stub*)calloc(1, sizeof(struct config_stub));
1027                 if(elem) elem->name = strdup(zone);
1028                 if(!elem || !elem->name) {
1029                         free(elem);
1030                         lock_basic_unlock(&ctx->cfglock);
1031                         errno = ENOMEM;
1032                         return UB_NOMEM;
1033                 }
1034                 elem->next = ctx->env->cfg->stubs;
1035                 ctx->env->cfg->stubs = elem;
1036         }
1037
1038         /* add the address to the list and set settings */
1039         elem->isprime = isprime;
1040         a = strdup(addr);
1041         if(!a) {
1042                 lock_basic_unlock(&ctx->cfglock);
1043                 errno = ENOMEM;
1044                 return UB_NOMEM;
1045         }
1046         if(!cfg_strlist_insert(&elem->addrs, a)) {
1047                 lock_basic_unlock(&ctx->cfglock);
1048                 free(a);
1049                 errno = ENOMEM;
1050                 return UB_NOMEM;
1051         }
1052         lock_basic_unlock(&ctx->cfglock);
1053         return UB_NOERROR;
1054 }
1055
1056 int
1057 ub_ctx_resolvconf(struct ub_ctx* ctx, const char* fname)
1058 {
1059         FILE* in;
1060         int numserv = 0;
1061         char buf[1024];
1062         char* parse, *addr;
1063         int r;
1064
1065         if(fname == NULL) {
1066 #if !defined(UB_ON_WINDOWS) || !defined(HAVE_WINDOWS_H)
1067                 fname = "/etc/resolv.conf";
1068 #else
1069                 FIXED_INFO *info;
1070                 ULONG buflen = sizeof(*info);
1071                 IP_ADDR_STRING *ptr;
1072
1073                 info = (FIXED_INFO *) malloc(sizeof (FIXED_INFO));
1074                 if (info == NULL)
1075                         return UB_READFILE;
1076
1077                 if (GetNetworkParams(info, &buflen) == ERROR_BUFFER_OVERFLOW) {
1078                         free(info);
1079                         info = (FIXED_INFO *) malloc(buflen);
1080                         if (info == NULL)
1081                                 return UB_READFILE;
1082                 }
1083
1084                 if (GetNetworkParams(info, &buflen) == NO_ERROR) {
1085                         int retval=0;
1086                         ptr = &(info->DnsServerList);
1087                         while (ptr) {
1088                                 numserv++;
1089                                 if((retval=ub_ctx_set_fwd(ctx,
1090                                         ptr->IpAddress.String))!=0) {
1091                                         free(info);
1092                                         return retval;
1093                                 }
1094                                 ptr = ptr->Next;
1095                         }
1096                         free(info);
1097                         if (numserv==0)
1098                                 return UB_READFILE;
1099                         return UB_NOERROR;
1100                 }
1101                 free(info);
1102                 return UB_READFILE;
1103 #endif /* WINDOWS */
1104         }
1105         in = fopen(fname, "r");
1106         if(!in) {
1107                 /* error in errno! perror(fname) */
1108                 return UB_READFILE;
1109         }
1110         while(fgets(buf, (int)sizeof(buf), in)) {
1111                 buf[sizeof(buf)-1] = 0;
1112                 parse=buf;
1113                 while(*parse == ' ' || *parse == '\t')
1114                         parse++;
1115                 if(strncmp(parse, "nameserver", 10) == 0) {
1116                         numserv++;
1117                         parse += 10; /* skip 'nameserver' */
1118                         /* skip whitespace */
1119                         while(*parse == ' ' || *parse == '\t')
1120                                 parse++;
1121                         addr = parse;
1122                         /* skip [0-9a-fA-F.:]*, i.e. IP4 and IP6 address */
1123                         while(isxdigit((unsigned char)*parse) || *parse=='.' || *parse==':')
1124                                 parse++;
1125                         /* terminate after the address, remove newline */
1126                         *parse = 0;
1127
1128                         if((r = ub_ctx_set_fwd(ctx, addr)) != UB_NOERROR) {
1129                                 fclose(in);
1130                                 return r;
1131                         }
1132                 }
1133         }
1134         fclose(in);
1135         if(numserv == 0) {
1136                 /* from resolv.conf(5) if none given, use localhost */
1137                 return ub_ctx_set_fwd(ctx, "127.0.0.1");
1138         }
1139         return UB_NOERROR;
1140 }
1141
1142 int
1143 ub_ctx_hosts(struct ub_ctx* ctx, const char* fname)
1144 {
1145         FILE* in;
1146         char buf[1024], ldata[1024];
1147         char* parse, *addr, *name, *ins;
1148         lock_basic_lock(&ctx->cfglock);
1149         if(ctx->finalized) {
1150                 lock_basic_unlock(&ctx->cfglock);
1151                 errno=EINVAL;
1152                 return UB_AFTERFINAL;
1153         }
1154         lock_basic_unlock(&ctx->cfglock);
1155         if(fname == NULL) {
1156 #if defined(UB_ON_WINDOWS) && defined(HAVE_WINDOWS_H)
1157                 /*
1158                  * If this is Windows NT/XP/2K it's in
1159                  * %WINDIR%\system32\drivers\etc\hosts.
1160                  * If this is Windows 95/98/Me it's in %WINDIR%\hosts.
1161                  */
1162                 name = getenv("WINDIR");
1163                 if (name != NULL) {
1164                         int retval=0;
1165                         snprintf(buf, sizeof(buf), "%s%s", name,
1166                                 "\\system32\\drivers\\etc\\hosts");
1167                         if((retval=ub_ctx_hosts(ctx, buf)) !=0 ) {
1168                                 snprintf(buf, sizeof(buf), "%s%s", name,
1169                                         "\\hosts");
1170                                 retval=ub_ctx_hosts(ctx, buf);
1171                         }
1172                         return retval;
1173                 }
1174                 return UB_READFILE;
1175 #else
1176                 fname = "/etc/hosts";
1177 #endif /* WIN32 */
1178         }
1179         in = fopen(fname, "r");
1180         if(!in) {
1181                 /* error in errno! perror(fname) */
1182                 return UB_READFILE;
1183         }
1184         while(fgets(buf, (int)sizeof(buf), in)) {
1185                 buf[sizeof(buf)-1] = 0;
1186                 parse=buf;
1187                 while(*parse == ' ' || *parse == '\t')
1188                         parse++;
1189                 if(*parse == '#')
1190                         continue; /* skip comment */
1191                 /* format: <addr> spaces <name> spaces <name> ... */
1192                 addr = parse;
1193                 /* skip addr */
1194                 while(isxdigit((unsigned char)*parse) || *parse == '.' || *parse == ':')
1195                         parse++;
1196                 if(*parse == '\r')
1197                         parse++;
1198                 if(*parse == '\n' || *parse == 0)
1199                         continue;
1200                 if(*parse == '%')
1201                         continue; /* ignore macOSX fe80::1%lo0 localhost */
1202                 if(*parse != ' ' && *parse != '\t') {
1203                         /* must have whitespace after address */
1204                         fclose(in);
1205                         errno=EINVAL;
1206                         return UB_SYNTAX;
1207                 }
1208                 *parse++ = 0; /* end delimiter for addr ... */
1209                 /* go to names and add them */
1210                 while(*parse) {
1211                         while(*parse == ' ' || *parse == '\t' || *parse=='\n'
1212                                 || *parse=='\r')
1213                                 parse++;
1214                         if(*parse == 0 || *parse == '#')
1215                                 break;
1216                         /* skip name, allows (too) many printable characters */
1217                         name = parse;
1218                         while('!' <= *parse && *parse <= '~')
1219                                 parse++;
1220                         if(*parse)
1221                                 *parse++ = 0; /* end delimiter for name */
1222                         snprintf(ldata, sizeof(ldata), "%s %s %s",
1223                                 name, str_is_ip6(addr)?"AAAA":"A", addr);
1224                         ins = strdup(ldata);
1225                         if(!ins) {
1226                                 /* out of memory */
1227                                 fclose(in);
1228                                 errno=ENOMEM;
1229                                 return UB_NOMEM;
1230                         }
1231                         lock_basic_lock(&ctx->cfglock);
1232                         if(!cfg_strlist_insert(&ctx->env->cfg->local_data,
1233                                 ins)) {
1234                                 lock_basic_unlock(&ctx->cfglock);
1235                                 fclose(in);
1236                                 free(ins);
1237                                 errno=ENOMEM;
1238                                 return UB_NOMEM;
1239                         }
1240                         lock_basic_unlock(&ctx->cfglock);
1241                 }
1242         }
1243         fclose(in);
1244         return UB_NOERROR;
1245 }
1246
1247 /** finalize the context, if not already finalized */
1248 static int ub_ctx_finalize(struct ub_ctx* ctx)
1249 {
1250         int res = 0;
1251         lock_basic_lock(&ctx->cfglock);
1252         if (!ctx->finalized) {
1253                 res = context_finalize(ctx);
1254         }
1255         lock_basic_unlock(&ctx->cfglock);
1256         return res;
1257 }
1258
1259 /* Print local zones and RR data */
1260 int ub_ctx_print_local_zones(struct ub_ctx* ctx)
1261 {
1262         int res = ub_ctx_finalize(ctx);
1263         if (res) return res;
1264
1265         local_zones_print(ctx->local_zones);
1266
1267         return UB_NOERROR;
1268 }
1269
1270 /* Add a new zone */
1271 int ub_ctx_zone_add(struct ub_ctx* ctx, const char *zone_name,
1272         const char *zone_type)
1273 {
1274         enum localzone_type t;
1275         struct local_zone* z;
1276         uint8_t* nm;
1277         int nmlabs;
1278         size_t nmlen;
1279
1280         int res = ub_ctx_finalize(ctx);
1281         if (res) return res;
1282
1283         if(!local_zone_str2type(zone_type, &t)) {
1284                 return UB_SYNTAX;
1285         }
1286
1287         if(!parse_dname(zone_name, &nm, &nmlen, &nmlabs)) {
1288                 return UB_SYNTAX;
1289         }
1290
1291         lock_rw_wrlock(&ctx->local_zones->lock);
1292         if((z=local_zones_find(ctx->local_zones, nm, nmlen, nmlabs,
1293                 LDNS_RR_CLASS_IN))) {
1294                 /* already present in tree */
1295                 lock_rw_wrlock(&z->lock);
1296                 z->type = t; /* update type anyway */
1297                 lock_rw_unlock(&z->lock);
1298                 lock_rw_unlock(&ctx->local_zones->lock);
1299                 free(nm);
1300                 return UB_NOERROR;
1301         }
1302         if(!local_zones_add_zone(ctx->local_zones, nm, nmlen, nmlabs,
1303                 LDNS_RR_CLASS_IN, t)) {
1304                 lock_rw_unlock(&ctx->local_zones->lock);
1305                 return UB_NOMEM;
1306         }
1307         lock_rw_unlock(&ctx->local_zones->lock);
1308         return UB_NOERROR;
1309 }
1310
1311 /* Remove zone */
1312 int ub_ctx_zone_remove(struct ub_ctx* ctx, const char *zone_name)
1313 {
1314         struct local_zone* z;
1315         uint8_t* nm;
1316         int nmlabs;
1317         size_t nmlen;
1318
1319         int res = ub_ctx_finalize(ctx);
1320         if (res) return res;
1321
1322         if(!parse_dname(zone_name, &nm, &nmlen, &nmlabs)) {
1323                 return UB_SYNTAX;
1324         }
1325
1326         lock_rw_wrlock(&ctx->local_zones->lock);
1327         if((z=local_zones_find(ctx->local_zones, nm, nmlen, nmlabs,
1328                 LDNS_RR_CLASS_IN))) {
1329                 /* present in tree */
1330                 local_zones_del_zone(ctx->local_zones, z);
1331         }
1332         lock_rw_unlock(&ctx->local_zones->lock);
1333         free(nm);
1334         return UB_NOERROR;
1335 }
1336
1337 /* Add new RR data */
1338 int ub_ctx_data_add(struct ub_ctx* ctx, const char *data)
1339 {
1340         int res = ub_ctx_finalize(ctx);
1341         if (res) return res;
1342
1343         res = local_zones_add_RR(ctx->local_zones, data);
1344         return (!res) ? UB_NOMEM : UB_NOERROR;
1345 }
1346
1347 /* Remove RR data */
1348 int ub_ctx_data_remove(struct ub_ctx* ctx, const char *data)
1349 {
1350         uint8_t* nm;
1351         int nmlabs;
1352         size_t nmlen;
1353         int res = ub_ctx_finalize(ctx);
1354         if (res) return res;
1355
1356         if(!parse_dname(data, &nm, &nmlen, &nmlabs))
1357                 return UB_SYNTAX;
1358
1359         local_zones_del_data(ctx->local_zones, nm, nmlen, nmlabs,
1360                 LDNS_RR_CLASS_IN);
1361
1362         free(nm);
1363         return UB_NOERROR;
1364 }
1365
1366 const char* ub_version(void)
1367 {
1368         return PACKAGE_VERSION;
1369 }
1370
1371 int
1372 ub_ctx_set_event(struct ub_ctx* ctx, struct event_base* base) {
1373         struct ub_event_base* new_base;
1374
1375         if (!ctx || !ctx->event_base || !base) {
1376                 return UB_INITFAIL;
1377         }
1378         if (ub_libevent_get_event_base(ctx->event_base) == base) {
1379                 /* already set */
1380                 return UB_NOERROR;
1381         }
1382
1383         lock_basic_lock(&ctx->cfglock);
1384         /* destroy the current worker - safe to pass in NULL */
1385         libworker_delete_event(ctx->event_worker);
1386         ctx->event_worker = NULL;
1387         new_base = ub_libevent_event_base(base);
1388         if (new_base)
1389                 ctx->event_base = new_base;
1390         ctx->created_bg = 0;
1391         ctx->dothread = 1;
1392         lock_basic_unlock(&ctx->cfglock);
1393         return new_base ? UB_NOERROR : UB_INITFAIL;
1394 }