packet.c
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00001 /*
00002  * packet.c
00003  *
00004  * dns packet implementation
00005  *
00006  * a Net::DNS like library for C
00007  *
00008  * (c) NLnet Labs, 2004-2006
00009  *
00010  * See the file LICENSE for the license
00011  */
00012 
00013 #include <ldns/config.h>
00014 
00015 #include <ldns/ldns.h>
00016 
00017 #include <strings.h>
00018 #include <limits.h>
00019 
00020 #ifdef HAVE_SSL
00021 #include <openssl/rand.h>
00022 #endif
00023 
00024 /* Access functions 
00025  * do this as functions to get type checking
00026  */
00027 
00028 #define LDNS_EDNS_MASK_DO_BIT 0x8000
00029 
00030 /* TODO defines for 3600 */
00031 /* convert to and from numerical flag values */
00032 ldns_lookup_table ldns_edns_flags[] = {
00033         { 3600, "do"},
00034         { 0, NULL}
00035 };
00036 
00037 /* read */
00038 uint16_t
00039 ldns_pkt_id(const ldns_pkt *packet)
00040 {
00041         return packet->_header->_id;
00042 }
00043 
00044 bool
00045 ldns_pkt_qr(const ldns_pkt *packet)
00046 {
00047         return packet->_header->_qr;
00048 }
00049 
00050 bool
00051 ldns_pkt_aa(const ldns_pkt *packet)
00052 {
00053         return packet->_header->_aa;
00054 }
00055 
00056 bool
00057 ldns_pkt_tc(const ldns_pkt *packet)
00058 {
00059         return packet->_header->_tc;
00060 }
00061 
00062 bool
00063 ldns_pkt_rd(const ldns_pkt *packet)
00064 {
00065         return packet->_header->_rd;
00066 }
00067 
00068 bool
00069 ldns_pkt_cd(const ldns_pkt *packet)
00070 {
00071         return packet->_header->_cd;
00072 }
00073 
00074 bool
00075 ldns_pkt_ra(const ldns_pkt *packet)
00076 {
00077         return packet->_header->_ra;
00078 }
00079 
00080 bool
00081 ldns_pkt_ad(const ldns_pkt *packet)
00082 {
00083         return packet->_header->_ad;
00084 }
00085 
00086 ldns_pkt_opcode
00087 ldns_pkt_get_opcode(const ldns_pkt *packet)
00088 {
00089         return packet->_header->_opcode;
00090 }
00091 
00092 ldns_pkt_rcode
00093 ldns_pkt_get_rcode(const ldns_pkt *packet)
00094 {
00095         return packet->_header->_rcode;
00096 }
00097 
00098 uint16_t
00099 ldns_pkt_qdcount(const ldns_pkt *packet)
00100 {
00101         return packet->_header->_qdcount;
00102 }
00103 
00104 uint16_t
00105 ldns_pkt_ancount(const ldns_pkt *packet)
00106 {
00107         return packet->_header->_ancount;
00108 }
00109 
00110 uint16_t
00111 ldns_pkt_nscount(const ldns_pkt *packet)
00112 {
00113         return packet->_header->_nscount;
00114 }
00115 
00116 uint16_t
00117 ldns_pkt_arcount(const ldns_pkt *packet)
00118 {
00119         return packet->_header->_arcount;
00120 }
00121 
00122 ldns_rr_list *
00123 ldns_pkt_question(const ldns_pkt *packet)
00124 {
00125         return packet->_question;
00126 }
00127 
00128 ldns_rr_list *
00129 ldns_pkt_answer(const ldns_pkt *packet)
00130 {
00131         return packet->_answer;
00132 }
00133 
00134 ldns_rr_list *
00135 ldns_pkt_authority(const ldns_pkt *packet)
00136 {
00137         return packet->_authority;
00138 }
00139 
00140 ldns_rr_list *
00141 ldns_pkt_additional(const ldns_pkt *packet)
00142 {
00143         return packet->_additional;
00144 }
00145 
00146 /* return ALL section concatenated */
00147 ldns_rr_list *
00148 ldns_pkt_all(const ldns_pkt *packet)
00149 {
00150         ldns_rr_list *all, *prev_all;
00151 
00152         all = ldns_rr_list_cat_clone(
00153                         ldns_pkt_question(packet),
00154                         ldns_pkt_answer(packet));
00155         prev_all = all;
00156         all = ldns_rr_list_cat_clone(all,
00157                         ldns_pkt_authority(packet));
00158         ldns_rr_list_deep_free(prev_all);
00159         prev_all = all;
00160         all = ldns_rr_list_cat_clone(all,
00161                         ldns_pkt_additional(packet));
00162         ldns_rr_list_deep_free(prev_all);
00163         return all;
00164 }
00165 
00166 ldns_rr_list *
00167 ldns_pkt_all_noquestion(const ldns_pkt *packet)
00168 {
00169         ldns_rr_list *all, *all2;
00170 
00171         all = ldns_rr_list_cat_clone(
00172                         ldns_pkt_answer(packet),
00173                         ldns_pkt_authority(packet));
00174         all2 = ldns_rr_list_cat_clone(all,
00175                         ldns_pkt_additional(packet));
00176         
00177         ldns_rr_list_deep_free(all);
00178         return all2;
00179 }
00180 
00181 size_t
00182 ldns_pkt_size(const ldns_pkt *packet)
00183 {
00184         return packet->_size;
00185 }
00186 
00187 uint32_t 
00188 ldns_pkt_querytime(const ldns_pkt *packet)
00189 {
00190         return packet->_querytime;
00191 }
00192 
00193 ldns_rdf *
00194 ldns_pkt_answerfrom(const ldns_pkt *packet)
00195 {
00196         return packet->_answerfrom;
00197 }
00198 
00199 struct timeval
00200 ldns_pkt_timestamp(const ldns_pkt *packet)
00201 {
00202         return packet->timestamp;
00203 }
00204 
00205 uint16_t
00206 ldns_pkt_edns_udp_size(const ldns_pkt *packet)
00207 {
00208         return packet->_edns_udp_size;
00209 }
00210 
00211 uint8_t
00212 ldns_pkt_edns_extended_rcode(const ldns_pkt *packet)
00213 {
00214         return packet->_edns_extended_rcode;
00215 }
00216 
00217 uint8_t
00218 ldns_pkt_edns_version(const ldns_pkt *packet)
00219 {
00220         return packet->_edns_version;
00221 }
00222 
00223 uint16_t
00224 ldns_pkt_edns_z(const ldns_pkt *packet)
00225 {
00226         return packet->_edns_z;
00227 }
00228 
00229 bool
00230 ldns_pkt_edns_do(const ldns_pkt *packet)
00231 {
00232         return (packet->_edns_z & LDNS_EDNS_MASK_DO_BIT);
00233 }
00234 
00235 void
00236 ldns_pkt_set_edns_do(ldns_pkt *packet, bool value)
00237 {
00238         if (value) {
00239                 packet->_edns_z = packet->_edns_z | LDNS_EDNS_MASK_DO_BIT;
00240         } else {
00241                 packet->_edns_z = packet->_edns_z & ~LDNS_EDNS_MASK_DO_BIT;
00242         }
00243 }
00244 
00245 ldns_rdf *
00246 ldns_pkt_edns_data(const ldns_pkt *packet)
00247 {
00248         return packet->_edns_data;
00249 }
00250 
00251 /* return only those rr that share the ownername */
00252 ldns_rr_list *
00253 ldns_pkt_rr_list_by_name(ldns_pkt *packet,
00254                          ldns_rdf *ownername,
00255                          ldns_pkt_section sec)
00256 {
00257         ldns_rr_list *rrs;
00258         ldns_rr_list *new;
00259         ldns_rr_list *ret;
00260         uint16_t i;
00261 
00262         if (!packet) {
00263                 return NULL;
00264         }
00265 
00266         rrs = ldns_pkt_get_section_clone(packet, sec);
00267         new = ldns_rr_list_new();
00268         ret = NULL;
00269 
00270         for(i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
00271                 if (ldns_rdf_compare(ldns_rr_owner(
00272                                                 ldns_rr_list_rr(rrs, i)), 
00273                                         ownername) == 0) {
00274                         /* owner names match */
00275                         ldns_rr_list_push_rr(new, ldns_rr_list_rr(rrs, i));
00276                         ret = new;
00277                 }
00278         }
00279         return ret;
00280 }
00281 
00282 /* return only those rr that share a type */
00283 ldns_rr_list *
00284 ldns_pkt_rr_list_by_type(const ldns_pkt *packet,
00285                          ldns_rr_type type,
00286                          ldns_pkt_section sec)
00287 {
00288         ldns_rr_list *rrs;
00289         ldns_rr_list *new;
00290         uint16_t i;
00291 
00292         if(!packet) {
00293                 return NULL;
00294         }
00295         
00296         rrs = ldns_pkt_get_section_clone(packet, sec);
00297         new = ldns_rr_list_new();
00298         
00299         for(i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
00300                 if (type == ldns_rr_get_type(ldns_rr_list_rr(rrs, i))) {
00301                         /* types match */
00302                         ldns_rr_list_push_rr(new, 
00303                                              ldns_rr_clone(
00304                                                 ldns_rr_list_rr(rrs, i))
00305                                              );
00306                 }
00307         }
00308         ldns_rr_list_deep_free(rrs);
00309 
00310         if (ldns_rr_list_rr_count(new) == 0) {
00311                 ldns_rr_list_free(new);
00312                 return NULL;
00313         } else {
00314                 return new;
00315         }
00316 }
00317 
00318 /* return only those rrs that share name and type */
00319 ldns_rr_list *
00320 ldns_pkt_rr_list_by_name_and_type(const ldns_pkt *packet,
00321                                   const ldns_rdf *ownername,
00322                                   ldns_rr_type type,
00323                                   ldns_pkt_section sec)
00324 {
00325         ldns_rr_list *rrs;
00326         ldns_rr_list *new;
00327         ldns_rr_list *ret;
00328         uint16_t i;
00329 
00330         if(!packet) {
00331                 return NULL;
00332         }
00333         
00334         rrs = ldns_pkt_get_section_clone(packet, sec);
00335         new = ldns_rr_list_new();
00336         ret = NULL;
00337 
00338         for(i = 0; i < ldns_rr_list_rr_count(rrs); i++) {
00339                 if (type == ldns_rr_get_type(ldns_rr_list_rr(rrs, i)) &&
00340                     ldns_rdf_compare(ldns_rr_owner(ldns_rr_list_rr(rrs, i)),
00341                                      ownername
00342                                     ) == 0
00343                    ) {
00344                         /* types match */
00345                         ldns_rr_list_push_rr(new, ldns_rr_clone(ldns_rr_list_rr(rrs, i)));
00346                         ret = new;
00347                 }
00348         }
00349         ldns_rr_list_deep_free(rrs);
00350         if (!ret) {
00351                 ldns_rr_list_free(new);
00352         }
00353         return ret;
00354 }
00355 
00356 bool
00357 ldns_pkt_rr(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr *rr)
00358 {
00359         bool result = false;
00360 
00361         switch (sec) {
00362         case LDNS_SECTION_QUESTION:
00363                 return ldns_rr_list_contains_rr(ldns_pkt_question(pkt), rr);
00364         case LDNS_SECTION_ANSWER:
00365                 return ldns_rr_list_contains_rr(ldns_pkt_answer(pkt), rr);
00366         case LDNS_SECTION_AUTHORITY:
00367                 return ldns_rr_list_contains_rr(ldns_pkt_authority(pkt), rr);
00368         case LDNS_SECTION_ADDITIONAL:
00369                 return ldns_rr_list_contains_rr(ldns_pkt_additional(pkt), rr);
00370         case LDNS_SECTION_ANY:
00371                 result = ldns_rr_list_contains_rr(ldns_pkt_question(pkt), rr);
00372         case LDNS_SECTION_ANY_NOQUESTION:
00373                 result = result
00374                     || ldns_rr_list_contains_rr(ldns_pkt_answer(pkt), rr)
00375                     || ldns_rr_list_contains_rr(ldns_pkt_authority(pkt), rr)
00376                     || ldns_rr_list_contains_rr(ldns_pkt_additional(pkt), rr);
00377         }
00378 
00379         return result;
00380 }
00381 
00382 uint16_t
00383 ldns_pkt_section_count(const ldns_pkt *packet, ldns_pkt_section s)
00384 {
00385         switch(s) {
00386         case LDNS_SECTION_QUESTION:
00387                 return ldns_pkt_qdcount(packet);
00388         case LDNS_SECTION_ANSWER:
00389                 return ldns_pkt_ancount(packet);
00390         case LDNS_SECTION_AUTHORITY:
00391                 return ldns_pkt_nscount(packet);
00392         case LDNS_SECTION_ADDITIONAL:
00393                 return ldns_pkt_arcount(packet);
00394         case LDNS_SECTION_ANY:
00395                 return ldns_pkt_qdcount(packet) +
00396                         ldns_pkt_ancount(packet) +
00397                         ldns_pkt_nscount(packet) +
00398                         ldns_pkt_arcount(packet);
00399         case LDNS_SECTION_ANY_NOQUESTION:
00400                 return ldns_pkt_ancount(packet) +
00401                         ldns_pkt_nscount(packet) +
00402                         ldns_pkt_arcount(packet);
00403         default:
00404                 return 0;
00405         }
00406 }
00407 
00408 bool
00409 ldns_pkt_empty(ldns_pkt *p)
00410 {
00411         if (!p) {
00412                 return true; /* NULL is empty? */
00413         }
00414         if (ldns_pkt_section_count(p, LDNS_SECTION_ANY) > 0) {
00415                 return false;
00416         } else {
00417                 return true;
00418     }
00419 }
00420 
00421 
00422 ldns_rr_list *
00423 ldns_pkt_get_section_clone(const ldns_pkt *packet, ldns_pkt_section s)
00424 {
00425         switch(s) {
00426         case LDNS_SECTION_QUESTION:
00427                 return ldns_rr_list_clone(ldns_pkt_question(packet));
00428         case LDNS_SECTION_ANSWER:
00429                 return ldns_rr_list_clone(ldns_pkt_answer(packet));
00430         case LDNS_SECTION_AUTHORITY:
00431                 return ldns_rr_list_clone(ldns_pkt_authority(packet));
00432         case LDNS_SECTION_ADDITIONAL:
00433                 return ldns_rr_list_clone(ldns_pkt_additional(packet));
00434         case LDNS_SECTION_ANY:
00435                 /* these are already clones */
00436                 return ldns_pkt_all(packet);
00437         case LDNS_SECTION_ANY_NOQUESTION:
00438                 return ldns_pkt_all_noquestion(packet);
00439         default:
00440                 return NULL;
00441         }
00442 }
00443 
00444 ldns_rr *ldns_pkt_tsig(const ldns_pkt *pkt) {
00445         return pkt->_tsig_rr;
00446 }
00447 
00448 /* write */
00449 void
00450 ldns_pkt_set_id(ldns_pkt *packet, uint16_t id)
00451 {
00452         packet->_header->_id = id;
00453 }
00454 
00455 void
00456 ldns_pkt_set_random_id(ldns_pkt *packet)
00457 {
00458         uint16_t rid = ldns_get_random();
00459         ldns_pkt_set_id(packet, rid);
00460 }
00461 
00462 
00463 void
00464 ldns_pkt_set_qr(ldns_pkt *packet, bool qr)
00465 {
00466         packet->_header->_qr = qr;
00467 }
00468 
00469 void
00470 ldns_pkt_set_aa(ldns_pkt *packet, bool aa)
00471 {
00472         packet->_header->_aa = aa;
00473 }
00474 
00475 void
00476 ldns_pkt_set_tc(ldns_pkt *packet, bool tc)
00477 {
00478         packet->_header->_tc = tc;
00479 }
00480 
00481 void
00482 ldns_pkt_set_rd(ldns_pkt *packet, bool rd)
00483 {
00484         packet->_header->_rd = rd;
00485 }
00486 
00487 void
00488 ldns_pkt_set_additional(ldns_pkt *p, ldns_rr_list *rr)
00489 {
00490         p->_additional = rr;
00491 }
00492 
00493 void
00494 ldns_pkt_set_question(ldns_pkt *p, ldns_rr_list *rr)
00495 {
00496         p->_question = rr;
00497 }
00498 
00499 void
00500 ldns_pkt_set_answer(ldns_pkt *p, ldns_rr_list *rr)
00501 {
00502         p->_answer = rr;
00503 }
00504 
00505 void
00506 ldns_pkt_set_authority(ldns_pkt *p, ldns_rr_list *rr)
00507 {
00508         p->_authority = rr;
00509 }
00510 
00511 void
00512 ldns_pkt_set_cd(ldns_pkt *packet, bool cd)
00513 {
00514         packet->_header->_cd = cd;
00515 }
00516 
00517 void
00518 ldns_pkt_set_ra(ldns_pkt *packet, bool ra)
00519 {
00520         packet->_header->_ra = ra;
00521 }
00522 
00523 void
00524 ldns_pkt_set_ad(ldns_pkt *packet, bool ad)
00525 {
00526         packet->_header->_ad = ad;
00527 }
00528 
00529 void
00530 ldns_pkt_set_opcode(ldns_pkt *packet, ldns_pkt_opcode opcode)
00531 {
00532         packet->_header->_opcode = opcode;
00533 }
00534 
00535 void
00536 ldns_pkt_set_rcode(ldns_pkt *packet, uint8_t rcode)
00537 {
00538         packet->_header->_rcode = rcode;
00539 }
00540 
00541 void
00542 ldns_pkt_set_qdcount(ldns_pkt *packet, uint16_t qdcount)
00543 {
00544         packet->_header->_qdcount = qdcount;
00545 }
00546 
00547 void
00548 ldns_pkt_set_ancount(ldns_pkt *packet, uint16_t ancount)
00549 {
00550         packet->_header->_ancount = ancount;
00551 }
00552 
00553 void
00554 ldns_pkt_set_nscount(ldns_pkt *packet, uint16_t nscount)
00555 {
00556         packet->_header->_nscount = nscount;
00557 }
00558 
00559 void
00560 ldns_pkt_set_arcount(ldns_pkt *packet, uint16_t arcount)
00561 {
00562         packet->_header->_arcount = arcount;
00563 }
00564 
00565 void
00566 ldns_pkt_set_querytime(ldns_pkt *packet, uint32_t time) 
00567 {
00568         packet->_querytime = time;
00569 }
00570 
00571 void
00572 ldns_pkt_set_answerfrom(ldns_pkt *packet, ldns_rdf *answerfrom)
00573 {
00574         packet->_answerfrom = answerfrom;
00575 }
00576 
00577 void
00578 ldns_pkt_set_timestamp(ldns_pkt *packet, struct timeval timeval)
00579 {
00580         packet->timestamp.tv_sec = timeval.tv_sec;
00581         packet->timestamp.tv_usec = timeval.tv_usec;
00582 }
00583 
00584 void
00585 ldns_pkt_set_size(ldns_pkt *packet, size_t s)
00586 {
00587         packet->_size = s;
00588 }
00589 
00590 void
00591 ldns_pkt_set_edns_udp_size(ldns_pkt *packet, uint16_t s)
00592 {
00593         packet->_edns_udp_size = s;
00594 }
00595 
00596 void
00597 ldns_pkt_set_edns_extended_rcode(ldns_pkt *packet, uint8_t c)
00598 {
00599         packet->_edns_extended_rcode = c;
00600 }
00601 
00602 void
00603 ldns_pkt_set_edns_version(ldns_pkt *packet, uint8_t v)
00604 {
00605         packet->_edns_version = v;
00606 }
00607 
00608 void
00609 ldns_pkt_set_edns_z(ldns_pkt *packet, uint16_t z)
00610 {
00611         packet->_edns_z = z;
00612 }
00613 
00614 void
00615 ldns_pkt_set_edns_data(ldns_pkt *packet, ldns_rdf *data)
00616 {
00617         packet->_edns_data = data;
00618 }
00619 
00620 void
00621 ldns_pkt_set_section_count(ldns_pkt *packet, ldns_pkt_section s, uint16_t count)
00622 {
00623         switch(s) {
00624                 case LDNS_SECTION_QUESTION:
00625                         ldns_pkt_set_qdcount(packet, count);
00626                         break;
00627                 case LDNS_SECTION_ANSWER:
00628                         ldns_pkt_set_ancount(packet, count);
00629                         break;
00630                 case LDNS_SECTION_AUTHORITY:
00631                         ldns_pkt_set_nscount(packet, count);
00632                         break;
00633                 case LDNS_SECTION_ADDITIONAL:
00634                         ldns_pkt_set_arcount(packet, count);
00635                         break;
00636                 case LDNS_SECTION_ANY:
00637                 case LDNS_SECTION_ANY_NOQUESTION:
00638                         break;
00639         }
00640 }
00641 
00642 void ldns_pkt_set_tsig(ldns_pkt *pkt, ldns_rr *rr)
00643 {
00644         pkt->_tsig_rr = rr;
00645 }
00646 
00647 bool
00648 ldns_pkt_push_rr(ldns_pkt *packet, ldns_pkt_section section, ldns_rr *rr)
00649 {
00650         switch(section) {
00651                 case LDNS_SECTION_QUESTION:
00652                         ldns_rr_list_push_rr(ldns_pkt_question(packet), rr);
00653                         ldns_pkt_set_qdcount(packet, ldns_pkt_qdcount(packet) + 1);
00654                         break;
00655                 case LDNS_SECTION_ANSWER:
00656                         ldns_rr_list_push_rr(ldns_pkt_answer(packet), rr);
00657                         ldns_pkt_set_ancount(packet, ldns_pkt_ancount(packet) + 1);
00658                         break;
00659                 case LDNS_SECTION_AUTHORITY:
00660                         ldns_rr_list_push_rr(ldns_pkt_authority(packet), rr);
00661                         ldns_pkt_set_nscount(packet, ldns_pkt_nscount(packet) + 1);
00662                         break;
00663                 case LDNS_SECTION_ADDITIONAL:
00664                         ldns_rr_list_push_rr(ldns_pkt_additional(packet), rr);
00665                         ldns_pkt_set_arcount(packet, ldns_pkt_arcount(packet) + 1);
00666                         break;
00667                 case LDNS_SECTION_ANY:
00668                 case LDNS_SECTION_ANY_NOQUESTION:
00669                         /* shouldn't this error? */
00670                         break;
00671         }
00672         return true;
00673 }
00674 
00675 bool
00676 ldns_pkt_safe_push_rr(ldns_pkt *pkt, ldns_pkt_section sec, ldns_rr *rr)
00677 {
00678 
00679         /* check to see if its there */
00680         if (ldns_pkt_rr(pkt, sec, rr)) {
00681                 /* already there */
00682                 return false;
00683         }
00684         return ldns_pkt_push_rr(pkt, sec, rr);
00685 }
00686 
00687 bool
00688 ldns_pkt_push_rr_list(ldns_pkt *p, ldns_pkt_section s, ldns_rr_list *list)
00689 {
00690         size_t i;
00691         for(i = 0; i < ldns_rr_list_rr_count(list); i++) {
00692                 if (!ldns_pkt_push_rr(p, s, ldns_rr_list_rr(list, i))) {
00693                         return false;
00694                 }
00695         }
00696         return true;
00697 }
00698 
00699 bool
00700 ldns_pkt_safe_push_rr_list(ldns_pkt *p, ldns_pkt_section s, ldns_rr_list *list)
00701 {
00702         size_t i;
00703         for(i = 0; i < ldns_rr_list_rr_count(list); i++) {
00704                 if (!ldns_pkt_safe_push_rr(p, s, ldns_rr_list_rr(list, i))) {
00705                         return false;
00706                 }
00707         }
00708         return true;
00709 }
00710 
00711 bool
00712 ldns_pkt_edns(const ldns_pkt *pkt) {
00713         return (ldns_pkt_edns_udp_size(pkt) > 0 ||
00714                 ldns_pkt_edns_extended_rcode(pkt) > 0 ||
00715                 ldns_pkt_edns_data(pkt) ||
00716                 ldns_pkt_edns_do(pkt)
00717                );
00718 }
00719 
00720 
00721 /* Create/destroy/convert functions
00722  */
00723 ldns_pkt *
00724 ldns_pkt_new()
00725 {
00726         ldns_pkt *packet;
00727         packet = LDNS_MALLOC(ldns_pkt);
00728         if (!packet) {
00729                 return NULL;
00730         }
00731 
00732         packet->_header = LDNS_MALLOC(ldns_hdr);
00733         if (!packet->_header) {
00734                 LDNS_FREE(packet);
00735                 return NULL;
00736         }
00737 
00738         packet->_question = ldns_rr_list_new();
00739         packet->_answer = ldns_rr_list_new();
00740         packet->_authority = ldns_rr_list_new();
00741         packet->_additional = ldns_rr_list_new();
00742 
00743         /* default everything to false */
00744         ldns_pkt_set_qr(packet, false);
00745         ldns_pkt_set_aa(packet, false);
00746         ldns_pkt_set_tc(packet, false);
00747         ldns_pkt_set_rd(packet, false);
00748         ldns_pkt_set_ra(packet, false);
00749         ldns_pkt_set_ad(packet, false);
00750         ldns_pkt_set_cd(packet, false);
00751 
00752         ldns_pkt_set_opcode(packet, LDNS_PACKET_QUERY);
00753         ldns_pkt_set_rcode(packet, 0);
00754         ldns_pkt_set_id(packet, 0); 
00755         ldns_pkt_set_size(packet, 0);
00756         ldns_pkt_set_querytime(packet, 0);
00757         memset(&packet->timestamp, 0, sizeof(packet->timestamp));
00758         ldns_pkt_set_answerfrom(packet, NULL);
00759         ldns_pkt_set_section_count(packet, LDNS_SECTION_QUESTION, 0);
00760         ldns_pkt_set_section_count(packet, LDNS_SECTION_ANSWER, 0);
00761         ldns_pkt_set_section_count(packet, LDNS_SECTION_AUTHORITY, 0);
00762         ldns_pkt_set_section_count(packet, LDNS_SECTION_ADDITIONAL, 0);
00763         
00764         ldns_pkt_set_edns_udp_size(packet, 0);
00765         ldns_pkt_set_edns_extended_rcode(packet, 0);
00766         ldns_pkt_set_edns_version(packet, 0);
00767         ldns_pkt_set_edns_z(packet, 0);
00768         ldns_pkt_set_edns_data(packet, NULL);
00769         
00770         ldns_pkt_set_tsig(packet, NULL);
00771         
00772         return packet;
00773 }
00774 
00775 void
00776 ldns_pkt_free(ldns_pkt *packet)
00777 {
00778         if (packet) {
00779                 LDNS_FREE(packet->_header);
00780                 ldns_rr_list_deep_free(packet->_question);
00781                 ldns_rr_list_deep_free(packet->_answer);
00782                 ldns_rr_list_deep_free(packet->_authority);
00783                 ldns_rr_list_deep_free(packet->_additional);
00784                 ldns_rr_free(packet->_tsig_rr);
00785                 ldns_rdf_deep_free(packet->_edns_data);
00786                 LDNS_FREE(packet);
00787         }
00788 }
00789 
00790 bool
00791 ldns_pkt_set_flags(ldns_pkt *packet, uint16_t flags)
00792 {
00793         if (!packet) {
00794                 return false;
00795         }
00796         if ((flags & LDNS_QR) == LDNS_QR) {
00797                 ldns_pkt_set_qr(packet, true);
00798         }
00799         if ((flags & LDNS_AA) == LDNS_AA) {
00800                 ldns_pkt_set_aa(packet, true);
00801         }
00802         if ((flags & LDNS_RD) == LDNS_RD) {
00803                 ldns_pkt_set_rd(packet, true);
00804         }
00805         if ((flags & LDNS_TC) == LDNS_TC) {
00806                 ldns_pkt_set_tc(packet, true);
00807         }
00808         if ((flags & LDNS_CD) == LDNS_CD) {
00809                 ldns_pkt_set_cd(packet, true);
00810         }
00811         if ((flags & LDNS_RA) == LDNS_RA) {
00812                 ldns_pkt_set_ra(packet, true);
00813         }
00814         if ((flags & LDNS_AD) == LDNS_AD) {
00815                 ldns_pkt_set_ad(packet, true);
00816         }
00817         return true;
00818 }
00819 
00820 ldns_status
00821 ldns_pkt_query_new_frm_str(ldns_pkt **p, const char *name, ldns_rr_type rr_type, 
00822                 ldns_rr_class rr_class, uint16_t flags)
00823 {
00824         ldns_pkt *packet;
00825         ldns_rr *question_rr;
00826         ldns_rdf *name_rdf;
00827 
00828         packet = ldns_pkt_new();
00829         if (!packet) {
00830                 return LDNS_STATUS_MEM_ERR;
00831         }
00832         
00833         if (!ldns_pkt_set_flags(packet, flags)) {
00834                 return LDNS_STATUS_ERR;
00835         }
00836         
00837         question_rr = ldns_rr_new();
00838         if (!question_rr) {
00839                 return LDNS_STATUS_MEM_ERR;
00840         }
00841 
00842         if (rr_type == 0) {
00843                 rr_type = LDNS_RR_TYPE_A;
00844         }
00845         if (rr_class == 0) {
00846                 rr_class = LDNS_RR_CLASS_IN;
00847         }
00848 
00849         if (ldns_str2rdf_dname(&name_rdf, name) == LDNS_STATUS_OK) {
00850                 ldns_rr_set_owner(question_rr, name_rdf);
00851                 ldns_rr_set_type(question_rr, rr_type);
00852                 ldns_rr_set_class(question_rr, rr_class);
00853                 ldns_rr_set_question(question_rr, true);
00854                 
00855                 ldns_pkt_push_rr(packet, LDNS_SECTION_QUESTION, question_rr);
00856         } else {
00857                 ldns_rr_free(question_rr);
00858                 ldns_pkt_free(packet);
00859                 return LDNS_STATUS_ERR;
00860         }
00861         
00862         packet->_tsig_rr = NULL;
00863         
00864         ldns_pkt_set_answerfrom(packet, NULL);
00865         if (p) {
00866                 *p = packet;
00867                 return LDNS_STATUS_OK;
00868         } else {
00869                 return LDNS_STATUS_NULL;
00870         }
00871 }
00872 
00873 ldns_pkt *
00874 ldns_pkt_query_new(ldns_rdf *rr_name, ldns_rr_type rr_type, ldns_rr_class rr_class,
00875                 uint16_t flags)
00876 {
00877         ldns_pkt *packet;
00878         ldns_rr *question_rr;
00879 
00880         packet = ldns_pkt_new();
00881         if (!packet) {
00882                 return NULL;
00883         }
00884 
00885         if (!ldns_pkt_set_flags(packet, flags)) {
00886                 return NULL;
00887         }
00888         
00889         question_rr = ldns_rr_new();
00890         if (!question_rr) {
00891                 return NULL;
00892         }
00893 
00894         if (rr_type == 0) {
00895                 rr_type = LDNS_RR_TYPE_A;
00896         }
00897         if (rr_class == 0) {
00898                 rr_class = LDNS_RR_CLASS_IN;
00899         }
00900 
00901         ldns_rr_set_owner(question_rr, rr_name);
00902         ldns_rr_set_type(question_rr, rr_type);
00903         ldns_rr_set_class(question_rr, rr_class);
00904         ldns_rr_set_question(question_rr, true);
00905         
00906         packet->_tsig_rr = NULL;
00907         
00908         ldns_pkt_push_rr(packet, LDNS_SECTION_QUESTION, question_rr);
00909 
00910         return packet;
00911 }
00912 
00913 ldns_pkt_type
00914 ldns_pkt_reply_type(ldns_pkt *p)
00915 {
00916         ldns_rr_list *tmp;
00917 
00918         if (!p) {
00919                 return LDNS_PACKET_UNKNOWN;
00920         }
00921 
00922         if (ldns_pkt_get_rcode(p) == LDNS_RCODE_NXDOMAIN) {
00923                 return LDNS_PACKET_NXDOMAIN;
00924         }
00925 
00926         if (ldns_pkt_ancount(p) == 0 && ldns_pkt_arcount(p) == 0
00927                         && ldns_pkt_nscount(p) == 1) {
00928 
00929                 /* check for SOA */
00930                 tmp = ldns_pkt_rr_list_by_type(p, LDNS_RR_TYPE_SOA, 
00931                                         LDNS_SECTION_AUTHORITY);
00932                 if (tmp) {
00933                         ldns_rr_list_deep_free(tmp);
00934                         return LDNS_PACKET_NODATA;
00935                 } else {
00936                         /* I have no idea ... */
00937                 }
00938         }
00939 
00940         if (ldns_pkt_ancount(p) == 0 && ldns_pkt_nscount(p) > 0) {
00941                 tmp = ldns_pkt_rr_list_by_type(p, LDNS_RR_TYPE_NS,
00942                                                LDNS_SECTION_AUTHORITY);
00943                 if (tmp) {
00944                         /* there are nameservers here */
00945                         ldns_rr_list_deep_free(tmp);
00946                         return LDNS_PACKET_REFERRAL;
00947                 } else {
00948                         /* I have no idea */
00949                 }
00950                 ldns_rr_list_deep_free(tmp);
00951         }
00952         
00953         /* if we cannot determine the packet type, we say it's an 
00954          * answer...
00955          */
00956         return LDNS_PACKET_ANSWER;
00957 }
00958 
00959 ldns_pkt *
00960 ldns_pkt_clone(ldns_pkt *pkt)
00961 {
00962         ldns_pkt *new_pkt;
00963         
00964         if (!pkt) {
00965                 return NULL;
00966         }
00967         new_pkt = ldns_pkt_new();
00968 
00969         ldns_pkt_set_id(new_pkt, ldns_pkt_id(pkt));
00970         ldns_pkt_set_qr(new_pkt, ldns_pkt_qr(pkt));
00971         ldns_pkt_set_aa(new_pkt, ldns_pkt_aa(pkt));
00972         ldns_pkt_set_tc(new_pkt, ldns_pkt_tc(pkt));
00973         ldns_pkt_set_rd(new_pkt, ldns_pkt_rd(pkt));
00974         ldns_pkt_set_cd(new_pkt, ldns_pkt_cd(pkt));
00975         ldns_pkt_set_ra(new_pkt, ldns_pkt_ra(pkt));
00976         ldns_pkt_set_ad(new_pkt, ldns_pkt_ad(pkt));
00977         ldns_pkt_set_opcode(new_pkt, ldns_pkt_get_opcode(pkt));
00978         ldns_pkt_set_rcode(new_pkt, ldns_pkt_get_rcode(pkt));
00979         ldns_pkt_set_qdcount(new_pkt, ldns_pkt_qdcount(pkt));
00980         ldns_pkt_set_ancount(new_pkt, ldns_pkt_ancount(pkt));
00981         ldns_pkt_set_nscount(new_pkt, ldns_pkt_nscount(pkt));
00982         ldns_pkt_set_arcount(new_pkt, ldns_pkt_arcount(pkt));
00983         ldns_pkt_set_answerfrom(new_pkt, ldns_pkt_answerfrom(pkt));
00984         ldns_pkt_set_querytime(new_pkt, ldns_pkt_querytime(pkt));
00985         ldns_pkt_set_size(new_pkt, ldns_pkt_size(pkt));
00986         ldns_pkt_set_tsig(new_pkt, ldns_rr_clone(ldns_pkt_tsig(pkt)));
00987         
00988         ldns_pkt_set_edns_udp_size(new_pkt, ldns_pkt_edns_udp_size(pkt));
00989         ldns_pkt_set_edns_extended_rcode(new_pkt, 
00990                 ldns_pkt_edns_extended_rcode(pkt));
00991         ldns_pkt_set_edns_version(new_pkt, ldns_pkt_edns_version(pkt));
00992         ldns_pkt_set_edns_z(new_pkt, ldns_pkt_edns_z(pkt));
00993         if(ldns_pkt_edns_data(pkt))
00994                 ldns_pkt_set_edns_data(new_pkt, 
00995                         ldns_rdf_clone(ldns_pkt_edns_data(pkt)));
00996         ldns_pkt_set_edns_do(new_pkt, ldns_pkt_edns_do(pkt));
00997 
00998         ldns_rr_list_deep_free(new_pkt->_question);
00999         ldns_rr_list_deep_free(new_pkt->_answer);
01000         ldns_rr_list_deep_free(new_pkt->_authority);
01001         ldns_rr_list_deep_free(new_pkt->_additional);
01002         new_pkt->_question = ldns_rr_list_clone(ldns_pkt_question(pkt));
01003         new_pkt->_answer = ldns_rr_list_clone(ldns_pkt_answer(pkt));
01004         new_pkt->_authority = ldns_rr_list_clone(ldns_pkt_authority(pkt));
01005         new_pkt->_additional = ldns_rr_list_clone(ldns_pkt_additional(pkt));
01006         return new_pkt;
01007 }