contrib/ldns/packet.c

   1 /*
   2  * packet.c
   3  *
   4  * dns packet implementation
   5  *
   6  * a Net::DNS like library for C
   7  *
   8  * (c) NLnet Labs, 2004-2006
   9  *
  10  * See the file LICENSE for the license
  11  */
  12
  13 #include <ldns/config.h>
  14
  15 #include <ldns/ldns.h>
  16
  17 #include <strings.h>
  18 #include <limits.h>
  19
  20 #ifdef HAVE_SSL
  21 #include <openssl/rand.h>
  22 #endif
  23
  24 /* Access functions
  25  * do this as functions to get type checking
  26  */
  27
  28 #define LDNS_EDNS_MASK_DO_BIT 0x8000
  29
  30 /* TODO defines for 3600 */
  31 /* convert to and from numerical flag values */
  32 ldns_lookup_table ldns_edns_flags[] = {
  33         { 3600, "do"},
  34         { 0, NULL}
  35 };
  36
  37 /* read */
  38 uint16_t
  39 ldns_pkt_id(const ldns_pkt *packet)
  40 {
  41         return packet->_header->_id;
  42 }
  43
  44 bool
  45 ldns_pkt_qr(const ldns_pkt *packet)
  46 {
  47         return packet->_header->_qr;
  48 }
  49
  50 bool
  51 ldns_pkt_aa(const ldns_pkt *packet)
  52 {
  53         return packet->_header->_aa;
  54 }
  55
  56 bool
  57 ldns_pkt_tc(const ldns_pkt *packet)
  58 {
  59         return packet->_header->_tc;
  60 }
  61
  62 bool
  63 ldns_pkt_rd(const ldns_pkt *packet)
  64 {
  65         return packet->_header->_rd;
  66 }
  67
  68 bool
  69 ldns_pkt_cd(const ldns_pkt *packet)
  70 {
  71         return packet->_header->_cd;
  72 }
  73
  74 bool
  75 ldns_pkt_ra(const ldns_pkt *packet)
  76 {
  77         return packet->_header->_ra;
  78 }
  79
  80 bool
  81 ldns_pkt_ad(const ldns_pkt *packet)
  82 {
  83         return packet->_header->_ad;
  84 }
  85
  86 ldns_pkt_opcode
  87 ldns_pkt_get_opcode(const ldns_pkt *packet)
  88 {
  89         return packet->_header->_opcode;
  90 }
  91
  92 ldns_pkt_rcode
  93 ldns_pkt_get_rcode(const ldns_pkt *packet)
  94 {
  95         return packet->_header->_rcode;
  96 }
  97
  98 uint16_t
  99 ldns_pkt_qdcount(const ldns_pkt *packet)
 100 {
 101         return packet->_header->_qdcount;
 102 }
 103
 104 uint16_t
 105 ldns_pkt_ancount(const ldns_pkt *packet)
 106 {
 107         return packet->_header->_ancount;
 108 }
 109
 110 uint16_t
 111 ldns_pkt_nscount(const ldns_pkt *packet)
 112 {
 113         return packet->_header->_nscount;
 114 }
 115
 116 uint16_t
 117 ldns_pkt_arcount(const ldns_pkt *packet)
 118 {
 119         return packet->_header->_arcount;
 120 }
 121
 122 ldns_rr_list *
 123 ldns_pkt_question(const ldns_pkt *packet)
 124 {
 125         return packet->_question;
 126 }
 127
 128 ldns_rr_list *
 129 ldns_pkt_answer(const ldns_pkt *packet)
 130 {
 131         return packet->_answer;
 132 }
 133
 134 ldns_rr_list *
 135 ldns_pkt_authority(const ldns_pkt *packet)
 136 {
 137         return packet->_authority;
 138 }
 139
 140 ldns_rr_list *
 141 ldns_pkt_additional(const ldns_pkt *packet)
 142 {
 143         return packet->_additional;
 144 }
 145
 146 /* return ALL section concatenated */
 147 ldns_rr_list *
 148 ldns_pkt_all(const ldns_pkt *packet)
 149 {
 150         ldns_rr_list *all, *prev_all;
 151
 152         all = ldns_rr_list_cat_clone(
 153                         ldns_pkt_question(packet),
 154                         ldns_pkt_answer(packet));
 155         prev_all = all;
 156         all = ldns_rr_list_cat_clone(all,
 157                         ldns_pkt_authority(packet));
 158         ldns_rr_list_deep_free(prev_all);
 159         prev_all = all;
 160         all = ldns_rr_list_cat_clone(all,
 161                         ldns_pkt_additional(packet));
 162         ldns_rr_list_deep_free(prev_all);
 163         return all;
 164 }
 165
 166 ldns_rr_list *
 167 ldns_pkt_all_noquestion(const ldns_pkt *packet)
 168 {
 169         ldns_rr_list *all, *all2;
 170
 171         all = ldns_rr_list_cat_clone(
 172                         ldns_pkt_answer(packet),
 173                         ldns_pkt_authority(packet));
 174         all2 = ldns_rr_list_cat_clone(all,
 175                         ldns_pkt_additional(packet));
 176
 177         ldns_rr_list_deep_free(all);
 178         return all2;
 179 }
 180
 181 size_t
 182 ldns_pkt_size(const ldns_pkt *packet)
 183 {
 184         return packet->_size;
 185 }
 186
 187 uint32_t
 188 ldns_pkt_querytime(const ldns_pkt *packet)
 189 {
 190         return packet->_querytime;
 191 }
 192
 193 ldns_rdf *
 194 ldns_pkt_answerfrom(const ldns_pkt *packet)
 195 {
 196         return packet->_answerfrom;
 197 }
 198
 199 struct timeval
 200 ldns_pkt_timestamp(const ldns_pkt *packet)
 201 {
 202         return packet->timestamp;
 203 }
 204
 205 uint16_t
 206 ldns_pkt_edns_udp_size(const ldns_pkt *packet)
 207 {
 208         return packet->_edns_udp_size;
 209 }
 210
 211 uint8_t
 212 ldns_pkt_edns_extended_rcode(const ldns_pkt *packet)
 213 {
 214         return packet->_edns_extended_rcode;
 215 }
 216
 217 uint8_t
 218 ldns_pkt_edns_version(const ldns_pkt *packet)
 219 {
 220         return packet->_edns_version;
 221 }
 222
 223 uint16_t
 224 ldns_pkt_edns_z(const ldns_pkt *packet)
 225 {
 226         return packet->_edns_z;
 227 }
 228
 229 bool
 230 ldns_pkt_edns_do(const ldns_pkt *packet)
 231 {
 232         return (packet->_edns_z & LDNS_EDNS_MASK_DO_BIT);
 233 }
 234
 235 void
 236 ldns_pkt_set_edns_do(ldns_pkt *packet, bool value)
 237 {
 238         if (value) {
 239                 packet->_edns_z = packet->_edns_z | LDNS_EDNS_MASK_DO_BIT;
 240         } else {
 241                 packet->_edns_z = packet->_edns_z & ~LDNS_EDNS_MASK_DO_BIT;
 242         }
 243 }
 244
 245 ldns_rdf *
 246 ldns_pkt_edns_data(const ldns_pkt *packet)
 247 {
 248         return packet->_edns_data;
 249 }
 250
 251 /* return only those rr that share the ownername */
 252 ldns_rr_list *
 253 ldns_pkt_rr_list_by_name(ldns_pkt *packet,
 254                          ldns_rdf *ownername,
 255                          ldns_pkt_section sec)
 256 {
 257         ldns_rr_list *rrs;
 258         ldns_rr_list *ret;
 259         uint16_t i;
 260
 261         if (!packet) {
 262                 return NULL;
 263         }
 264
 265         rrs = ldns_pkt_get_section_clone(packet, sec);
 266         ret = NULL;
 267
 268         for(i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
 269                 if (ldns_rdf_compare(ldns_rr_owner(
 270                                                 ldns_rr_list_rr(rrs, i)),
 271                                         ownername) == 0) {
 272                         /* owner names match */
 273                         if (ret == NULL) {
 274                                 ret = ldns_rr_list_new();
 275                         }
 276                         ldns_rr_list_push_rr(ret, ldns_rr_list_rr(rrs, i));
 277                 }
 278         }
 279         return ret;
 280 }
 281
 282 /* return only those rr that share a type */
 283 ldns_rr_list *
 284 ldns_pkt_rr_list_by_type(const ldns_pkt *packet,
 285                          ldns_rr_type type,
 286                          ldns_pkt_section sec)
 287 {
 288         ldns_rr_list *rrs;
 289         ldns_rr_list *new;
 290         uint16_t i;
 291
 292         if(!packet) {
 293                 return NULL;
 294         }
 295
 296         rrs = ldns_pkt_get_section_clone(packet, sec);
 297         new = ldns_rr_list_new();
 298
 299         for(i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
 300                 if (type == ldns_rr_get_type(ldns_rr_list_rr(rrs, i))) {
 301                         /* types match */
 302                         ldns_rr_list_push_rr(new,
 303                                              ldns_rr_clone(
 304                                                 ldns_rr_list_rr(rrs, i))
 305                                              );
 306                 }
 307         }
 308         ldns_rr_list_deep_free(rrs);
 309
 310         if (ldns_rr_list_rr_count(new) == 0) {
 311                 ldns_rr_list_free(new);
 312                 return NULL;
 313         } else {
 314                 return new;
 315         }
 316 }
 317
 318 /* return only those rrs that share name and type */
 319 ldns_rr_list *
 320 ldns_pkt_rr_list_by_name_and_type(const ldns_pkt *packet,
 321                                   const ldns_rdf *ownername,
 322                                   ldns_rr_type type,
 323                                   ldns_pkt_section sec)
 324 {
 325         ldns_rr_list *rrs;
 326         ldns_rr_list *new;
 327         ldns_rr_list *ret;
 328         uint16_t i;
 329
 330         if(!packet) {
 331                 return NULL;
 332         }
 333
 334         rrs = ldns_pkt_get_section_clone(packet, sec);
 335         new = ldns_rr_list_new();
 336         ret = NULL;
 337
 338         for(i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
 339                 if (type == ldns_rr_get_type(ldns_rr_list_rr(rrs, i)) &&
 340                     ldns_rdf_compare(ldns_rr_owner(ldns_rr_list_rr(rrs, i)),
 341                                      ownername
 342                                     ) == 0
 343                    ) {
 344                         /* types match */
 345                         ldns_rr_list_push_rr(new, ldns_rr_clone(ldns_rr_list_rr(rrs, i)));
 346                         ret = new;
 347                 }
 348         }
 349         ldns_rr_list_deep_free(rrs);
 350         if (!ret) {
 351                 ldns_rr_list_free(new);
 352         }
 353         return ret;
 354 }
 355
 356 bool
 357 ldns_pkt_rr(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr *rr)
 358 {
 359         bool result = false;
 360
 361         switch (sec) {
 362         case LDNS_SECTION_QUESTION:
 363                 return ldns_rr_list_contains_rr(ldns_pkt_question(pkt), rr);
 364         case LDNS_SECTION_ANSWER:
 365                 return ldns_rr_list_contains_rr(ldns_pkt_answer(pkt), rr);
 366         case LDNS_SECTION_AUTHORITY:
 367                 return ldns_rr_list_contains_rr(ldns_pkt_authority(pkt), rr);
 368         case LDNS_SECTION_ADDITIONAL:
 369                 return ldns_rr_list_contains_rr(ldns_pkt_additional(pkt), rr);
 370         case LDNS_SECTION_ANY:
 371                 result = ldns_rr_list_contains_rr(ldns_pkt_question(pkt), rr);
 372         case LDNS_SECTION_ANY_NOQUESTION:
 373                 result = result
 374                     || ldns_rr_list_contains_rr(ldns_pkt_answer(pkt), rr)
 375                     || ldns_rr_list_contains_rr(ldns_pkt_authority(pkt), rr)
 376                     || ldns_rr_list_contains_rr(ldns_pkt_additional(pkt), rr);
 377         }
 378
 379         return result;
 380 }
 381
 382 uint16_t
 383 ldns_pkt_section_count(const ldns_pkt *packet, ldns_pkt_section s)
 384 {
 385         switch(s) {
 386         case LDNS_SECTION_QUESTION:
 387                 return ldns_pkt_qdcount(packet);
 388         case LDNS_SECTION_ANSWER:
 389                 return ldns_pkt_ancount(packet);
 390         case LDNS_SECTION_AUTHORITY:
 391                 return ldns_pkt_nscount(packet);
 392         case LDNS_SECTION_ADDITIONAL:
 393                 return ldns_pkt_arcount(packet);
 394         case LDNS_SECTION_ANY:
 395                 return ldns_pkt_qdcount(packet) +
 396                         ldns_pkt_ancount(packet) +
 397                         ldns_pkt_nscount(packet) +
 398                         ldns_pkt_arcount(packet);
 399         case LDNS_SECTION_ANY_NOQUESTION:
 400                 return ldns_pkt_ancount(packet) +
 401                         ldns_pkt_nscount(packet) +
 402                         ldns_pkt_arcount(packet);
 403         default:
 404                 return 0;
 405         }
 406 }
 407
 408 bool
 409 ldns_pkt_empty(ldns_pkt *p)
 410 {
 411         if (!p) {
 412                 return true; /* NULL is empty? */
 413         }
 414         if (ldns_pkt_section_count(p, LDNS_SECTION_ANY) > 0) {
 415                 return false;
 416         } else {
 417                 return true;
 418     }
 419 }
 420
 421
 422 ldns_rr_list *
 423 ldns_pkt_get_section_clone(const ldns_pkt *packet, ldns_pkt_section s)
 424 {
 425         switch(s) {
 426         case LDNS_SECTION_QUESTION:
 427                 return ldns_rr_list_clone(ldns_pkt_question(packet));
 428         case LDNS_SECTION_ANSWER:
 429                 return ldns_rr_list_clone(ldns_pkt_answer(packet));
 430         case LDNS_SECTION_AUTHORITY:
 431                 return ldns_rr_list_clone(ldns_pkt_authority(packet));
 432         case LDNS_SECTION_ADDITIONAL:
 433                 return ldns_rr_list_clone(ldns_pkt_additional(packet));
 434         case LDNS_SECTION_ANY:
 435                 /* these are already clones */
 436                 return ldns_pkt_all(packet);
 437         case LDNS_SECTION_ANY_NOQUESTION:
 438                 return ldns_pkt_all_noquestion(packet);
 439         default:
 440                 return NULL;
 441         }
 442 }
 443
 444 ldns_rr *ldns_pkt_tsig(const ldns_pkt *pkt) {
 445         return pkt->_tsig_rr;
 446 }
 447
 448 /* write */
 449 void
 450 ldns_pkt_set_id(ldns_pkt *packet, uint16_t id)
 451 {
 452         packet->_header->_id = id;
 453 }
 454
 455 void
 456 ldns_pkt_set_random_id(ldns_pkt *packet)
 457 {
 458         uint16_t rid = ldns_get_random();
 459         ldns_pkt_set_id(packet, rid);
 460 }
 461
 462
 463 void
 464 ldns_pkt_set_qr(ldns_pkt *packet, bool qr)
 465 {
 466         packet->_header->_qr = qr;
 467 }
 468
 469 void
 470 ldns_pkt_set_aa(ldns_pkt *packet, bool aa)
 471 {
 472         packet->_header->_aa = aa;
 473 }
 474
 475 void
 476 ldns_pkt_set_tc(ldns_pkt *packet, bool tc)
 477 {
 478         packet->_header->_tc = tc;
 479 }
 480
 481 void
 482 ldns_pkt_set_rd(ldns_pkt *packet, bool rd)
 483 {
 484         packet->_header->_rd = rd;
 485 }
 486
 487 void
 488 ldns_pkt_set_additional(ldns_pkt *p, ldns_rr_list *rr)
 489 {
 490         p->_additional = rr;
 491 }
 492
 493 void
 494 ldns_pkt_set_question(ldns_pkt *p, ldns_rr_list *rr)
 495 {
 496         p->_question = rr;
 497 }
 498
 499 void
 500 ldns_pkt_set_answer(ldns_pkt *p, ldns_rr_list *rr)
 501 {
 502         p->_answer = rr;
 503 }
 504
 505 void
 506 ldns_pkt_set_authority(ldns_pkt *p, ldns_rr_list *rr)
 507 {
 508         p->_authority = rr;
 509 }
 510
 511 void
 512 ldns_pkt_set_cd(ldns_pkt *packet, bool cd)
 513 {
 514         packet->_header->_cd = cd;
 515 }
 516
 517 void
 518 ldns_pkt_set_ra(ldns_pkt *packet, bool ra)
 519 {
 520         packet->_header->_ra = ra;
 521 }
 522
 523 void
 524 ldns_pkt_set_ad(ldns_pkt *packet, bool ad)
 525 {
 526         packet->_header->_ad = ad;
 527 }
 528
 529 void
 530 ldns_pkt_set_opcode(ldns_pkt *packet, ldns_pkt_opcode opcode)
 531 {
 532         packet->_header->_opcode = opcode;
 533 }
 534
 535 void
 536 ldns_pkt_set_rcode(ldns_pkt *packet, uint8_t rcode)
 537 {
 538         packet->_header->_rcode = rcode;
 539 }
 540
 541 void
 542 ldns_pkt_set_qdcount(ldns_pkt *packet, uint16_t qdcount)
 543 {
 544         packet->_header->_qdcount = qdcount;
 545 }
 546
 547 void
 548 ldns_pkt_set_ancount(ldns_pkt *packet, uint16_t ancount)
 549 {
 550         packet->_header->_ancount = ancount;
 551 }
 552
 553 void
 554 ldns_pkt_set_nscount(ldns_pkt *packet, uint16_t nscount)
 555 {
 556         packet->_header->_nscount = nscount;
 557 }
 558
 559 void
 560 ldns_pkt_set_arcount(ldns_pkt *packet, uint16_t arcount)
 561 {
 562         packet->_header->_arcount = arcount;
 563 }
 564
 565 void
 566 ldns_pkt_set_querytime(ldns_pkt *packet, uint32_t time)
 567 {
 568         packet->_querytime = time;
 569 }
 570
 571 void
 572 ldns_pkt_set_answerfrom(ldns_pkt *packet, ldns_rdf *answerfrom)
 573 {
 574         packet->_answerfrom = answerfrom;
 575 }
 576
 577 void
 578 ldns_pkt_set_timestamp(ldns_pkt *packet, struct timeval timeval)
 579 {
 580         packet->timestamp.tv_sec = timeval.tv_sec;
 581         packet->timestamp.tv_usec = timeval.tv_usec;
 582 }
 583
 584 void
 585 ldns_pkt_set_size(ldns_pkt *packet, size_t s)
 586 {
 587         packet->_size = s;
 588 }
 589
 590 void
 591 ldns_pkt_set_edns_udp_size(ldns_pkt *packet, uint16_t s)
 592 {
 593         packet->_edns_udp_size = s;
 594 }
 595
 596 void
 597 ldns_pkt_set_edns_extended_rcode(ldns_pkt *packet, uint8_t c)
 598 {
 599         packet->_edns_extended_rcode = c;
 600 }
 601
 602 void
 603 ldns_pkt_set_edns_version(ldns_pkt *packet, uint8_t v)
 604 {
 605         packet->_edns_version = v;
 606 }
 607
 608 void
 609 ldns_pkt_set_edns_z(ldns_pkt *packet, uint16_t z)
 610 {
 611         packet->_edns_z = z;
 612 }
 613
 614 void
 615 ldns_pkt_set_edns_data(ldns_pkt *packet, ldns_rdf *data)
 616 {
 617         packet->_edns_data = data;
 618 }
 619
 620 void
 621 ldns_pkt_set_section_count(ldns_pkt *packet, ldns_pkt_section s, uint16_t count)
 622 {
 623         switch(s) {
 624                 case LDNS_SECTION_QUESTION:
 625                         ldns_pkt_set_qdcount(packet, count);
 626                         break;
 627                 case LDNS_SECTION_ANSWER:
 628                         ldns_pkt_set_ancount(packet, count);
 629                         break;
 630                 case LDNS_SECTION_AUTHORITY:
 631                         ldns_pkt_set_nscount(packet, count);
 632                         break;
 633                 case LDNS_SECTION_ADDITIONAL:
 634                         ldns_pkt_set_arcount(packet, count);
 635                         break;
 636                 case LDNS_SECTION_ANY:
 637                 case LDNS_SECTION_ANY_NOQUESTION:
 638                         break;
 639         }
 640 }
 641
 642 void ldns_pkt_set_tsig(ldns_pkt *pkt, ldns_rr *rr)
 643 {
 644         pkt->_tsig_rr = rr;
 645 }
 646
 647 bool
 648 ldns_pkt_push_rr(ldns_pkt *packet, ldns_pkt_section section, ldns_rr *rr)
 649 {
 650         switch(section) {
 651                 case LDNS_SECTION_QUESTION:
 652                         if (!ldns_rr_list_push_rr(ldns_pkt_question(packet), rr)) {
 653                                 return false;
 654                         }
 655                         ldns_pkt_set_qdcount(packet, ldns_pkt_qdcount(packet) + 1);
 656                         break;
 657                 case LDNS_SECTION_ANSWER:
 658                         if (!ldns_rr_list_push_rr(ldns_pkt_answer(packet), rr)) {
 659                                 return false;
 660                         }
 661                         ldns_pkt_set_ancount(packet, ldns_pkt_ancount(packet) + 1);
 662                         break;
 663                 case LDNS_SECTION_AUTHORITY:
 664                         if (!ldns_rr_list_push_rr(ldns_pkt_authority(packet), rr)) {
 665                                 return false;
 666                         }
 667                         ldns_pkt_set_nscount(packet, ldns_pkt_nscount(packet) + 1);
 668                         break;
 669                 case LDNS_SECTION_ADDITIONAL:
 670                         if (!ldns_rr_list_push_rr(ldns_pkt_additional(packet), rr)) {
 671                                 return false;
 672                         }
 673                         ldns_pkt_set_arcount(packet, ldns_pkt_arcount(packet) + 1);
 674                         break;
 675                 case LDNS_SECTION_ANY:
 676                 case LDNS_SECTION_ANY_NOQUESTION:
 677                         /* shouldn't this error? */
 678                         break;
 679         }
 680         return true;
 681 }
 682
 683 bool
 684 ldns_pkt_safe_push_rr(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr *rr)
 685 {
 686
 687         /* check to see if its there */
 688         if (ldns_pkt_rr(pkt, sec, rr)) {
 689                 /* already there */
 690                 return false;
 691         }
 692         return ldns_pkt_push_rr(pkt, sec, rr);
 693 }
 694
 695 bool
 696 ldns_pkt_push_rr_list(ldns_pkt *p, ldns_pkt_section s, ldns_rr_list *list)
 697 {
 698         size_t i;
 699         for(i = 0; i < ldns_rr_list_rr_count(list); i++) {
 700                 if (!ldns_pkt_push_rr(p, s, ldns_rr_list_rr(list, i))) {
 701                         return false;
 702                 }
 703         }
 704         return true;
 705 }
 706
 707 bool
 708 ldns_pkt_safe_push_rr_list(ldns_pkt *p, ldns_pkt_section s, ldns_rr_list *list)
 709 {
 710         size_t i;
 711         for(i = 0; i < ldns_rr_list_rr_count(list); i++) {
 712                 if (!ldns_pkt_safe_push_rr(p, s, ldns_rr_list_rr(list, i))) {
 713                         return false;
 714                 }
 715         }
 716         return true;
 717 }
 718
 719 bool
 720 ldns_pkt_edns(const ldns_pkt *pkt) {
 721         return (ldns_pkt_edns_udp_size(pkt) > 0 ||
 722                 ldns_pkt_edns_extended_rcode(pkt) > 0 ||
 723                 ldns_pkt_edns_data(pkt) ||
 724                 ldns_pkt_edns_do(pkt)
 725                );
 726 }
 727
 728
 729 /* Create/destroy/convert functions
 730  */
 731 ldns_pkt *
 732 ldns_pkt_new()
 733 {
 734         ldns_pkt *packet;
 735         packet = LDNS_MALLOC(ldns_pkt);
 736         if (!packet) {
 737                 return NULL;
 738         }
 739
 740         packet->_header = LDNS_MALLOC(ldns_hdr);
 741         if (!packet->_header) {
 742                 LDNS_FREE(packet);
 743                 return NULL;
 744         }
 745
 746         packet->_question = ldns_rr_list_new();
 747         packet->_answer = ldns_rr_list_new();
 748         packet->_authority = ldns_rr_list_new();
 749         packet->_additional = ldns_rr_list_new();
 750
 751         /* default everything to false */
 752         ldns_pkt_set_qr(packet, false);
 753         ldns_pkt_set_aa(packet, false);
 754         ldns_pkt_set_tc(packet, false);
 755         ldns_pkt_set_rd(packet, false);
 756         ldns_pkt_set_ra(packet, false);
 757         ldns_pkt_set_ad(packet, false);
 758         ldns_pkt_set_cd(packet, false);
 759
 760         ldns_pkt_set_opcode(packet, LDNS_PACKET_QUERY);
 761         ldns_pkt_set_rcode(packet, 0);
 762         ldns_pkt_set_id(packet, 0);
 763         ldns_pkt_set_size(packet, 0);
 764         ldns_pkt_set_querytime(packet, 0);
 765         memset(&packet->timestamp, 0, sizeof(packet->timestamp));
 766         ldns_pkt_set_answerfrom(packet, NULL);
 767         ldns_pkt_set_section_count(packet, LDNS_SECTION_QUESTION, 0);
 768         ldns_pkt_set_section_count(packet, LDNS_SECTION_ANSWER, 0);
 769         ldns_pkt_set_section_count(packet, LDNS_SECTION_AUTHORITY, 0);
 770         ldns_pkt_set_section_count(packet, LDNS_SECTION_ADDITIONAL, 0);
 771
 772         ldns_pkt_set_edns_udp_size(packet, 0);
 773         ldns_pkt_set_edns_extended_rcode(packet, 0);
 774         ldns_pkt_set_edns_version(packet, 0);
 775         ldns_pkt_set_edns_z(packet, 0);
 776         ldns_pkt_set_edns_data(packet, NULL);
 777
 778         ldns_pkt_set_tsig(packet, NULL);
 779
 780         return packet;
 781 }
 782
 783 void
 784 ldns_pkt_free(ldns_pkt *packet)
 785 {
 786         if (packet) {
 787                 LDNS_FREE(packet->_header);
 788                 ldns_rr_list_deep_free(packet->_question);
 789                 ldns_rr_list_deep_free(packet->_answer);
 790                 ldns_rr_list_deep_free(packet->_authority);
 791                 ldns_rr_list_deep_free(packet->_additional);
 792                 ldns_rr_free(packet->_tsig_rr);
 793                 ldns_rdf_deep_free(packet->_edns_data);
 794                 ldns_rdf_deep_free(packet->_answerfrom);
 795                 LDNS_FREE(packet);
 796         }
 797 }
 798
 799 bool
 800 ldns_pkt_set_flags(ldns_pkt *packet, uint16_t flags)
 801 {
 802         if (!packet) {
 803                 return false;
 804         }
 805         if ((flags & LDNS_QR) == LDNS_QR) {
 806                 ldns_pkt_set_qr(packet, true);
 807         }
 808         if ((flags & LDNS_AA) == LDNS_AA) {
 809                 ldns_pkt_set_aa(packet, true);
 810         }
 811         if ((flags & LDNS_RD) == LDNS_RD) {
 812                 ldns_pkt_set_rd(packet, true);
 813         }
 814         if ((flags & LDNS_TC) == LDNS_TC) {
 815                 ldns_pkt_set_tc(packet, true);
 816         }
 817         if ((flags & LDNS_CD) == LDNS_CD) {
 818                 ldns_pkt_set_cd(packet, true);
 819         }
 820         if ((flags & LDNS_RA) == LDNS_RA) {
 821                 ldns_pkt_set_ra(packet, true);
 822         }
 823         if ((flags & LDNS_AD) == LDNS_AD) {
 824                 ldns_pkt_set_ad(packet, true);
 825         }
 826         return true;
 827 }
 828
 829
 830 static ldns_status
 831 ldns_pkt_add_authsoa(ldns_pkt* packet, ldns_rdf* rr_name, ldns_rr_class rr_class)
 832 {
 833         ldns_rr* soa_rr = ldns_rr_new();
 834         ldns_rdf *owner_rdf;
 835         ldns_rdf *mname_rdf;
 836         ldns_rdf *rname_rdf;
 837         ldns_rdf *serial_rdf;
 838         ldns_rdf *refresh_rdf;
 839         ldns_rdf *retry_rdf;
 840         ldns_rdf *expire_rdf;
 841         ldns_rdf *minimum_rdf;
 842
 843         if (!soa_rr) {
 844                 return LDNS_STATUS_MEM_ERR;
 845         }
 846         owner_rdf = ldns_rdf_clone(rr_name);
 847         if (!owner_rdf) {
 848                 ldns_rr_free(soa_rr);
 849                 return LDNS_STATUS_MEM_ERR;
 850         }
 851
 852         ldns_rr_set_owner(soa_rr, owner_rdf);
 853         ldns_rr_set_type(soa_rr, LDNS_RR_TYPE_SOA);
 854         ldns_rr_set_class(soa_rr, rr_class);
 855         ldns_rr_set_question(soa_rr, false);
 856
 857         if (ldns_str2rdf_dname(&mname_rdf, ".") != LDNS_STATUS_OK) {
 858                 ldns_rr_free(soa_rr);
 859                 return LDNS_STATUS_MEM_ERR;
 860         } else {
 861                 ldns_rr_push_rdf(soa_rr, mname_rdf);
 862         }
 863         if (ldns_str2rdf_dname(&rname_rdf, ".") != LDNS_STATUS_OK) {
 864                 ldns_rr_free(soa_rr);
 865                 return LDNS_STATUS_MEM_ERR;
 866         } else {
 867                 ldns_rr_push_rdf(soa_rr, rname_rdf);
 868         }
 869         serial_rdf = ldns_native2rdf_int32(LDNS_RDF_TYPE_INT32, 0);
 870         if (!serial_rdf) {
 871                 ldns_rr_free(soa_rr);
 872                 return LDNS_STATUS_MEM_ERR;
 873         } else {
 874                 ldns_rr_push_rdf(soa_rr, serial_rdf);
 875         }
 876         refresh_rdf = ldns_native2rdf_int32(LDNS_RDF_TYPE_INT32, 0);
 877         if (!refresh_rdf) {
 878                 ldns_rr_free(soa_rr);
 879                 return LDNS_STATUS_MEM_ERR;
 880         } else {
 881                 ldns_rr_push_rdf(soa_rr, refresh_rdf);
 882         }
 883         retry_rdf = ldns_native2rdf_int32(LDNS_RDF_TYPE_INT32, 0);
 884         if (!retry_rdf) {
 885                 ldns_rr_free(soa_rr);
 886                 return LDNS_STATUS_MEM_ERR;
 887         } else {
 888                 ldns_rr_push_rdf(soa_rr, retry_rdf);
 889         }
 890         expire_rdf = ldns_native2rdf_int32(LDNS_RDF_TYPE_INT32, 0);
 891         if (!expire_rdf) {
 892                 ldns_rr_free(soa_rr);
 893                 return LDNS_STATUS_MEM_ERR;
 894         } else {
 895                 ldns_rr_push_rdf(soa_rr, expire_rdf);
 896         }
 897         minimum_rdf = ldns_native2rdf_int32(LDNS_RDF_TYPE_INT32, 0);
 898         if (!minimum_rdf) {
 899                 ldns_rr_free(soa_rr);
 900                 return LDNS_STATUS_MEM_ERR;
 901         } else {
 902                 ldns_rr_push_rdf(soa_rr, minimum_rdf);
 903         }
 904         ldns_pkt_push_rr(packet, LDNS_SECTION_AUTHORITY, soa_rr);
 905         return LDNS_STATUS_OK;
 906 }
 907
 908
 909 ldns_status
 910 ldns_pkt_query_new_frm_str(ldns_pkt **p, const char *name, ldns_rr_type rr_type,
 911                 ldns_rr_class rr_class, uint16_t flags)
 912 {
 913         ldns_pkt *packet;
 914         ldns_rr *question_rr;
 915         ldns_rdf *name_rdf;
 916
 917         packet = ldns_pkt_new();
 918         if (!packet) {
 919                 return LDNS_STATUS_MEM_ERR;
 920         }
 921
 922         if (!ldns_pkt_set_flags(packet, flags)) {
 923                 return LDNS_STATUS_ERR;
 924         }
 925
 926         question_rr = ldns_rr_new();
 927         if (!question_rr) {
 928                 return LDNS_STATUS_MEM_ERR;
 929         }
 930
 931         if (rr_type == 0) {
 932                 rr_type = LDNS_RR_TYPE_A;
 933         }
 934         if (rr_class == 0) {
 935                 rr_class = LDNS_RR_CLASS_IN;
 936         }
 937
 938         if (ldns_str2rdf_dname(&name_rdf, name) == LDNS_STATUS_OK) {
 939                 ldns_rr_set_owner(question_rr, name_rdf);
 940                 ldns_rr_set_type(question_rr, rr_type);
 941                 ldns_rr_set_class(question_rr, rr_class);
 942                 ldns_rr_set_question(question_rr, true);
 943
 944                 ldns_pkt_push_rr(packet, LDNS_SECTION_QUESTION, question_rr);
 945         } else {
 946                 ldns_rr_free(question_rr);
 947                 ldns_pkt_free(packet);
 948                 return LDNS_STATUS_ERR;
 949         }
 950
 951         /** IXFR? */
 952         if (rr_type == LDNS_RR_TYPE_IXFR) {
 953                 if (ldns_pkt_add_authsoa(packet, name_rdf, rr_class) != LDNS_STATUS_OK) {
 954                         ldns_pkt_free(packet);
 955                         return LDNS_STATUS_ERR;
 956                 }
 957         }
 958
 959         packet->_tsig_rr = NULL;
 960         ldns_pkt_set_answerfrom(packet, NULL);
 961         if (p) {
 962                 *p = packet;
 963                 return LDNS_STATUS_OK;
 964         } else {
 965                 ldns_pkt_free(packet);
 966                 return LDNS_STATUS_NULL;
 967         }
 968 }
 969
 970 ldns_pkt *
 971 ldns_pkt_query_new(ldns_rdf *rr_name, ldns_rr_type rr_type, ldns_rr_class rr_class,
 972                 uint16_t flags)
 973 {
 974         ldns_pkt *packet;
 975         ldns_rr *question_rr;
 976
 977         packet = ldns_pkt_new();
 978         if (!packet) {
 979                 return NULL;
 980         }
 981
 982         if (!ldns_pkt_set_flags(packet, flags)) {
 983                 return NULL;
 984         }
 985
 986         question_rr = ldns_rr_new();
 987         if (!question_rr) {
 988                 ldns_pkt_free(packet);
 989                 return NULL;
 990         }
 991
 992         if (rr_type == 0) {
 993                 rr_type = LDNS_RR_TYPE_A;
 994         }
 995         if (rr_class == 0) {
 996                 rr_class = LDNS_RR_CLASS_IN;
 997         }
 998
 999         ldns_rr_set_owner(question_rr, rr_name);
1000         ldns_rr_set_type(question_rr, rr_type);
1001         ldns_rr_set_class(question_rr, rr_class);
1002         ldns_rr_set_question(question_rr, true);
1003         ldns_pkt_push_rr(packet, LDNS_SECTION_QUESTION, question_rr);
1004
1005         /** IXFR? */
1006         if (rr_type == LDNS_RR_TYPE_IXFR) {
1007                 if (ldns_pkt_add_authsoa(packet, rr_name, rr_class) != LDNS_STATUS_OK) {
1008                         ldns_pkt_free(packet);
1009                         return NULL;
1010                 }
1011         }
1012
1013         packet->_tsig_rr = NULL;
1014         return packet;
1015 }
1016
1017 ldns_pkt_type
1018 ldns_pkt_reply_type(ldns_pkt *p)
1019 {
1020         ldns_rr_list *tmp;
1021
1022         if (!p) {
1023                 return LDNS_PACKET_UNKNOWN;
1024         }
1025
1026         if (ldns_pkt_get_rcode(p) == LDNS_RCODE_NXDOMAIN) {
1027                 return LDNS_PACKET_NXDOMAIN;
1028         }
1029
1030         if (ldns_pkt_ancount(p) == 0 && ldns_pkt_arcount(p) == 0
1031                         && ldns_pkt_nscount(p) == 1) {
1032
1033                 /* check for SOA */
1034                 tmp = ldns_pkt_rr_list_by_type(p, LDNS_RR_TYPE_SOA,
1035                                         LDNS_SECTION_AUTHORITY);
1036                 if (tmp) {
1037                         ldns_rr_list_deep_free(tmp);
1038                         return LDNS_PACKET_NODATA;
1039                 } else {
1040                         /* I have no idea ... */
1041                 }
1042         }
1043
1044         if (ldns_pkt_ancount(p) == 0 && ldns_pkt_nscount(p) > 0) {
1045                 tmp = ldns_pkt_rr_list_by_type(p, LDNS_RR_TYPE_NS,
1046                                                LDNS_SECTION_AUTHORITY);
1047                 if (tmp) {
1048                         /* there are nameservers here */
1049                         ldns_rr_list_deep_free(tmp);
1050                         return LDNS_PACKET_REFERRAL;
1051                 } else {
1052                         /* I have no idea */
1053                 }
1054                 ldns_rr_list_deep_free(tmp);
1055         }
1056
1057         /* if we cannot determine the packet type, we say it's an
1058          * answer...
1059          */
1060         return LDNS_PACKET_ANSWER;
1061 }
1062
1063 ldns_pkt *
1064 ldns_pkt_clone(ldns_pkt *pkt)
1065 {
1066         ldns_pkt *new_pkt;
1067
1068         if (!pkt) {
1069                 return NULL;
1070         }
1071         new_pkt = ldns_pkt_new();
1072
1073         ldns_pkt_set_id(new_pkt, ldns_pkt_id(pkt));
1074         ldns_pkt_set_qr(new_pkt, ldns_pkt_qr(pkt));
1075         ldns_pkt_set_aa(new_pkt, ldns_pkt_aa(pkt));
1076         ldns_pkt_set_tc(new_pkt, ldns_pkt_tc(pkt));
1077         ldns_pkt_set_rd(new_pkt, ldns_pkt_rd(pkt));
1078         ldns_pkt_set_cd(new_pkt, ldns_pkt_cd(pkt));
1079         ldns_pkt_set_ra(new_pkt, ldns_pkt_ra(pkt));
1080         ldns_pkt_set_ad(new_pkt, ldns_pkt_ad(pkt));
1081         ldns_pkt_set_opcode(new_pkt, ldns_pkt_get_opcode(pkt));
1082         ldns_pkt_set_rcode(new_pkt, ldns_pkt_get_rcode(pkt));
1083         ldns_pkt_set_qdcount(new_pkt, ldns_pkt_qdcount(pkt));
1084         ldns_pkt_set_ancount(new_pkt, ldns_pkt_ancount(pkt));
1085         ldns_pkt_set_nscount(new_pkt, ldns_pkt_nscount(pkt));
1086         ldns_pkt_set_arcount(new_pkt, ldns_pkt_arcount(pkt));
1087         if (ldns_pkt_answerfrom(pkt))
1088                 ldns_pkt_set_answerfrom(new_pkt,
1089                         ldns_rdf_clone(ldns_pkt_answerfrom(pkt)));
1090         ldns_pkt_set_querytime(new_pkt, ldns_pkt_querytime(pkt));
1091         ldns_pkt_set_size(new_pkt, ldns_pkt_size(pkt));
1092         ldns_pkt_set_tsig(new_pkt, ldns_rr_clone(ldns_pkt_tsig(pkt)));
1093
1094         ldns_pkt_set_edns_udp_size(new_pkt, ldns_pkt_edns_udp_size(pkt));
1095         ldns_pkt_set_edns_extended_rcode(new_pkt,
1096                 ldns_pkt_edns_extended_rcode(pkt));
1097         ldns_pkt_set_edns_version(new_pkt, ldns_pkt_edns_version(pkt));
1098         ldns_pkt_set_edns_z(new_pkt, ldns_pkt_edns_z(pkt));
1099         if(ldns_pkt_edns_data(pkt))
1100                 ldns_pkt_set_edns_data(new_pkt,
1101                         ldns_rdf_clone(ldns_pkt_edns_data(pkt)));
1102         ldns_pkt_set_edns_do(new_pkt, ldns_pkt_edns_do(pkt));
1103
1104         ldns_rr_list_deep_free(new_pkt->_question);
1105         ldns_rr_list_deep_free(new_pkt->_answer);
1106         ldns_rr_list_deep_free(new_pkt->_authority);
1107         ldns_rr_list_deep_free(new_pkt->_additional);
1108         new_pkt->_question = ldns_rr_list_clone(ldns_pkt_question(pkt));
1109         new_pkt->_answer = ldns_rr_list_clone(ldns_pkt_answer(pkt));
1110         new_pkt->_authority = ldns_rr_list_clone(ldns_pkt_authority(pkt));
1111         new_pkt->_additional = ldns_rr_list_clone(ldns_pkt_additional(pkt));
1112         return new_pkt;
1113 }