| 1 | /* zone.c |
| 2 | * |
| 3 | * Functions for ldns_zone structure |
| 4 | * a Net::DNS like library for C |
| 5 | * |
| 6 | * (c) NLnet Labs, 2005-2006 |
| 7 | * See the file LICENSE for the license |
| 8 | */ |
| 9 | #include <ldns/config.h> |
| 10 | |
| 11 | #include <ldns/ldns.h> |
| 12 | |
| 13 | #include <strings.h> |
| 14 | #include <limits.h> |
| 15 | |
| 16 | ldns_rr * |
| 17 | ldns_zone_soa(const ldns_zone *z) |
| 18 | { |
| 19 | return z->_soa; |
| 20 | } |
| 21 | |
| 22 | size_t |
| 23 | ldns_zone_rr_count(const ldns_zone *z) |
| 24 | { |
| 25 | return ldns_rr_list_rr_count(z->_rrs); |
| 26 | } |
| 27 | |
| 28 | void |
| 29 | ldns_zone_set_soa(ldns_zone *z, ldns_rr *soa) |
| 30 | { |
| 31 | z->_soa = soa; |
| 32 | } |
| 33 | |
| 34 | ldns_rr_list * |
| 35 | ldns_zone_rrs(const ldns_zone *z) |
| 36 | { |
| 37 | return z->_rrs; |
| 38 | } |
| 39 | |
| 40 | void |
| 41 | ldns_zone_set_rrs(ldns_zone *z, ldns_rr_list *rrlist) |
| 42 | { |
| 43 | z->_rrs = rrlist; |
| 44 | } |
| 45 | |
| 46 | bool |
| 47 | ldns_zone_push_rr_list(ldns_zone *z, ldns_rr_list *list) |
| 48 | { |
| 49 | return ldns_rr_list_cat(ldns_zone_rrs(z), list); |
| 50 | |
| 51 | } |
| 52 | |
| 53 | bool |
| 54 | ldns_zone_push_rr(ldns_zone *z, ldns_rr *rr) |
| 55 | { |
| 56 | return ldns_rr_list_push_rr( ldns_zone_rrs(z), rr); |
| 57 | } |
| 58 | |
| 59 | /* return a clone of the given rr list, without the glue records |
| 60 | * rr list should be the complete zone |
| 61 | * if present, stripped records are added to the list *glue_records |
| 62 | */ |
| 63 | ldns_rr_list * |
| 64 | ldns_zone_strip_glue_rrs(const ldns_rdf *zone_name, const ldns_rr_list *rrs, ldns_rr_list *glue_rrs) |
| 65 | { |
| 66 | ldns_rr_list *new_list; |
| 67 | |
| 68 | /* when do we find glue? It means we find an IP address |
| 69 | * (AAAA/A) for a nameserver listed in the zone |
| 70 | * |
| 71 | * Alg used here: |
| 72 | * first find all the zonecuts (NS records) |
| 73 | * find all the AAAA or A records (can be done it the |
| 74 | * above loop). |
| 75 | * |
| 76 | * Check if the aaaa/a list are subdomains under the |
| 77 | * NS domains. |
| 78 | * If yes -> glue, if no -> not glue |
| 79 | */ |
| 80 | |
| 81 | ldns_rr_list *zone_cuts; |
| 82 | ldns_rr_list *addr; |
| 83 | ldns_rr *r, *ns, *a; |
| 84 | ldns_rdf *dname_a, *dname_ns, *ns_owner; |
| 85 | uint16_t i,j; |
| 86 | |
| 87 | new_list = NULL; |
| 88 | zone_cuts = NULL; |
| 89 | addr = NULL; |
| 90 | |
| 91 | new_list = ldns_rr_list_new(); |
| 92 | if (!new_list) goto memory_error; |
| 93 | zone_cuts = ldns_rr_list_new(); |
| 94 | if (!zone_cuts) goto memory_error; |
| 95 | addr = ldns_rr_list_new(); |
| 96 | if (!addr) goto memory_error; |
| 97 | |
| 98 | for(i = 0; i < ldns_rr_list_rr_count(rrs); i++) { |
| 99 | r = ldns_rr_list_rr(rrs, i); |
| 100 | if (ldns_rr_get_type(r) == LDNS_RR_TYPE_A || |
| 101 | ldns_rr_get_type(r) == LDNS_RR_TYPE_AAAA) { |
| 102 | /* possibly glue */ |
| 103 | if (!ldns_rr_list_push_rr(addr, r)) goto memory_error; |
| 104 | continue; |
| 105 | } |
| 106 | if (ldns_rr_get_type(r) == LDNS_RR_TYPE_NS) { |
| 107 | /* multiple zones will end up here - |
| 108 | * for now; not a problem |
| 109 | */ |
| 110 | /* don't add NS records for the current zone itself */ |
| 111 | if (ldns_rdf_compare(ldns_rr_owner(r), |
| 112 | zone_name) != 0) { |
| 113 | if (!ldns_rr_list_push_rr(zone_cuts, r)) goto memory_error; |
| 114 | } |
| 115 | continue; |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | /* will sorting make it quicker ?? */ |
| 120 | for(i = 0; i < ldns_rr_list_rr_count(zone_cuts); i++) { |
| 121 | ns = ldns_rr_list_rr(zone_cuts, i); |
| 122 | ns_owner = ldns_rr_owner(ns); |
| 123 | dname_ns = ldns_rr_ns_nsdname(ns); |
| 124 | for(j = 0; j < ldns_rr_list_rr_count(addr); j++) { |
| 125 | a = ldns_rr_list_rr(addr, j); |
| 126 | dname_a = ldns_rr_owner(a); |
| 127 | |
| 128 | if (ldns_dname_is_subdomain(dname_a, ns_owner)) { |
| 129 | /* GLUE! */ |
| 130 | if (glue_rrs) { |
| 131 | if (!ldns_rr_list_push_rr(glue_rrs, a)) goto memory_error; |
| 132 | } |
| 133 | break; |
| 134 | } else { |
| 135 | if (!ldns_rr_list_push_rr(new_list, a)) goto memory_error; |
| 136 | } |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | ldns_rr_list_free(addr); |
| 141 | ldns_rr_list_free(zone_cuts); |
| 142 | |
| 143 | return new_list; |
| 144 | |
| 145 | memory_error: |
| 146 | if (new_list) { |
| 147 | ldns_rr_list_free(new_list); |
| 148 | } |
| 149 | if (zone_cuts) { |
| 150 | ldns_rr_list_free(zone_cuts); |
| 151 | } |
| 152 | if (addr) { |
| 153 | ldns_rr_list_free(addr); |
| 154 | } |
| 155 | return NULL; |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * Get the list of glue records in a zone |
| 160 | * XXX: there should be a way for this to return error, other than NULL, |
| 161 | * since NULL is a valid return |
| 162 | */ |
| 163 | ldns_rr_list * |
| 164 | ldns_zone_glue_rr_list(const ldns_zone *z) |
| 165 | { |
| 166 | /* when do we find glue? It means we find an IP address |
| 167 | * (AAAA/A) for a nameserver listed in the zone |
| 168 | * |
| 169 | * Alg used here: |
| 170 | * first find all the zonecuts (NS records) |
| 171 | * find all the AAAA or A records (can be done it the |
| 172 | * above loop). |
| 173 | * |
| 174 | * Check if the aaaa/a list are subdomains under the |
| 175 | * NS domains. |
| 176 | * If yes -> glue, if no -> not glue |
| 177 | */ |
| 178 | |
| 179 | ldns_rr_list *zone_cuts; |
| 180 | ldns_rr_list *addr; |
| 181 | ldns_rr_list *glue; |
| 182 | ldns_rr *r, *ns, *a; |
| 183 | ldns_rdf *dname_a, *dname_ns, *ns_owner; |
| 184 | size_t i,j; |
| 185 | |
| 186 | zone_cuts = NULL; |
| 187 | addr = NULL; |
| 188 | glue = NULL; |
| 189 | |
| 190 | /* we cannot determine glue in a 'zone' without a SOA */ |
| 191 | if (!ldns_zone_soa(z)) { |
| 192 | return NULL; |
| 193 | } |
| 194 | |
| 195 | zone_cuts = ldns_rr_list_new(); |
| 196 | if (!zone_cuts) goto memory_error; |
| 197 | addr = ldns_rr_list_new(); |
| 198 | if (!addr) goto memory_error; |
| 199 | glue = ldns_rr_list_new(); |
| 200 | if (!glue) goto memory_error; |
| 201 | |
| 202 | for(i = 0; i < ldns_zone_rr_count(z); i++) { |
| 203 | r = ldns_rr_list_rr(ldns_zone_rrs(z), i); |
| 204 | if (ldns_rr_get_type(r) == LDNS_RR_TYPE_A || |
| 205 | ldns_rr_get_type(r) == LDNS_RR_TYPE_AAAA) { |
| 206 | /* possibly glue */ |
| 207 | if (!ldns_rr_list_push_rr(addr, r)) goto memory_error; |
| 208 | continue; |
| 209 | } |
| 210 | if (ldns_rr_get_type(r) == LDNS_RR_TYPE_NS) { |
| 211 | /* multiple zones will end up here - |
| 212 | * for now; not a problem |
| 213 | */ |
| 214 | /* don't add NS records for the current zone itself */ |
| 215 | if (ldns_rdf_compare(ldns_rr_owner(r), |
| 216 | ldns_rr_owner(ldns_zone_soa(z))) != 0) { |
| 217 | if (!ldns_rr_list_push_rr(zone_cuts, r)) goto memory_error; |
| 218 | } |
| 219 | continue; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* will sorting make it quicker ?? */ |
| 224 | for(i = 0; i < ldns_rr_list_rr_count(zone_cuts); i++) { |
| 225 | ns = ldns_rr_list_rr(zone_cuts, i); |
| 226 | ns_owner = ldns_rr_owner(ns); |
| 227 | |
| 228 | dname_ns = ldns_rr_ns_nsdname(ns); |
| 229 | for(j = 0; j < ldns_rr_list_rr_count(addr); j++) { |
| 230 | a = ldns_rr_list_rr(addr, j); |
| 231 | dname_a = ldns_rr_owner(a); |
| 232 | |
| 233 | if (ldns_dname_is_subdomain(dname_a, ns_owner)) { |
| 234 | /* GLUE! */ |
| 235 | if (!ldns_rr_list_push_rr(glue, a)) goto memory_error; |
| 236 | } |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | ldns_rr_list_free(addr); |
| 241 | ldns_rr_list_free(zone_cuts); |
| 242 | |
| 243 | if (ldns_rr_list_rr_count(glue) == 0) { |
| 244 | ldns_rr_list_free(glue); |
| 245 | return NULL; |
| 246 | } else { |
| 247 | return glue; |
| 248 | } |
| 249 | |
| 250 | memory_error: |
| 251 | if (zone_cuts) { |
| 252 | LDNS_FREE(zone_cuts); |
| 253 | } |
| 254 | if (addr) { |
| 255 | ldns_rr_list_free(addr); |
| 256 | } |
| 257 | if (glue) { |
| 258 | ldns_rr_list_free(glue); |
| 259 | } |
| 260 | return NULL; |
| 261 | } |
| 262 | |
| 263 | ldns_zone * |
| 264 | ldns_zone_new(void) |
| 265 | { |
| 266 | ldns_zone *z; |
| 267 | |
| 268 | z = LDNS_MALLOC(ldns_zone); |
| 269 | if (!z) { |
| 270 | return NULL; |
| 271 | } |
| 272 | |
| 273 | z->_rrs = ldns_rr_list_new(); |
| 274 | if (!z->_rrs) { |
| 275 | LDNS_FREE(z); |
| 276 | return NULL; |
| 277 | } |
| 278 | ldns_zone_set_soa(z, NULL); |
| 279 | return z; |
| 280 | } |
| 281 | |
| 282 | /* we regocnize: |
| 283 | * $TTL, $ORIGIN |
| 284 | */ |
| 285 | ldns_status |
| 286 | ldns_zone_new_frm_fp(ldns_zone **z, FILE *fp, ldns_rdf *origin, uint32_t ttl, ldns_rr_class c) |
| 287 | { |
| 288 | return ldns_zone_new_frm_fp_l(z, fp, origin, ttl, c, NULL); |
| 289 | } |
| 290 | |
| 291 | /* XXX: class is never used */ |
| 292 | ldns_status |
| 293 | ldns_zone_new_frm_fp_l(ldns_zone **z, FILE *fp, ldns_rdf *origin, uint32_t ttl, ldns_rr_class c, |
| 294 | int *line_nr) |
| 295 | { |
| 296 | ldns_zone *newzone; |
| 297 | ldns_rr *rr; |
| 298 | uint32_t my_ttl; |
| 299 | ldns_rr_class my_class; |
| 300 | ldns_rdf *my_origin; |
| 301 | ldns_rdf *my_prev; |
| 302 | bool soa_seen = false; /* 2 soa are an error */ |
| 303 | ldns_status s; |
| 304 | ldns_status ret; |
| 305 | |
| 306 | /* most cases of error are memory problems */ |
| 307 | ret = LDNS_STATUS_MEM_ERR; |
| 308 | |
| 309 | newzone = NULL; |
| 310 | my_origin = NULL; |
| 311 | my_prev = NULL; |
| 312 | |
| 313 | my_ttl = ttl; |
| 314 | my_class = c; |
| 315 | |
| 316 | if (origin) { |
| 317 | my_origin = ldns_rdf_clone(origin); |
| 318 | if (!my_origin) goto error; |
| 319 | /* also set the prev */ |
| 320 | my_prev = ldns_rdf_clone(origin); |
| 321 | if (!my_prev) goto error; |
| 322 | } |
| 323 | |
| 324 | newzone = ldns_zone_new(); |
| 325 | if (!newzone) goto error; |
| 326 | |
| 327 | while(!feof(fp)) { |
| 328 | s = ldns_rr_new_frm_fp_l(&rr, fp, &my_ttl, &my_origin, &my_prev, line_nr); |
| 329 | switch (s) { |
| 330 | case LDNS_STATUS_OK: |
| 331 | if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_SOA) { |
| 332 | if (soa_seen) { |
| 333 | /* second SOA |
| 334 | * just skip, maybe we want to say |
| 335 | * something??? */ |
| 336 | ldns_rr_free(rr); |
| 337 | continue; |
| 338 | } |
| 339 | soa_seen = true; |
| 340 | ldns_zone_set_soa(newzone, rr); |
| 341 | /* set origin to soa if not specified */ |
| 342 | if (!my_origin) { |
| 343 | my_origin = ldns_rdf_clone(ldns_rr_owner(rr)); |
| 344 | } |
| 345 | continue; |
| 346 | } |
| 347 | |
| 348 | /* a normal RR - as sofar the DNS is normal */ |
| 349 | if (!ldns_zone_push_rr(newzone, rr)) goto error; |
| 350 | |
| 351 | /*my_origin = ldns_rr_owner(rr);*/ |
| 352 | my_ttl = ldns_rr_ttl(rr); /* XXX: this seems like an error */ |
| 353 | my_class = ldns_rr_get_class(rr); |
| 354 | case LDNS_STATUS_SYNTAX_EMPTY: |
| 355 | /* empty line was seen */ |
| 356 | case LDNS_STATUS_SYNTAX_TTL: |
| 357 | /* the function set the ttl */ |
| 358 | break; |
| 359 | case LDNS_STATUS_SYNTAX_ORIGIN: |
| 360 | /* the function set the origin */ |
| 361 | break; |
| 362 | default: |
| 363 | ret = s; |
| 364 | goto error; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | if (my_origin) { |
| 369 | ldns_rdf_deep_free(my_origin); |
| 370 | } |
| 371 | if (my_prev) { |
| 372 | ldns_rdf_deep_free(my_prev); |
| 373 | } |
| 374 | if (z) { |
| 375 | *z = newzone; |
| 376 | } else { |
| 377 | ldns_zone_free(newzone); |
| 378 | } |
| 379 | |
| 380 | return LDNS_STATUS_OK; |
| 381 | |
| 382 | error: |
| 383 | if (my_origin) { |
| 384 | ldns_rdf_deep_free(my_origin); |
| 385 | } |
| 386 | if (my_prev) { |
| 387 | ldns_rdf_deep_free(my_prev); |
| 388 | } |
| 389 | if (newzone) { |
| 390 | ldns_zone_free(newzone); |
| 391 | } |
| 392 | return ret; |
| 393 | } |
| 394 | |
| 395 | void |
| 396 | ldns_zone_sort(ldns_zone *zone) |
| 397 | { |
| 398 | ldns_rr_list *zrr; |
| 399 | assert(zone != NULL); |
| 400 | |
| 401 | zrr = ldns_zone_rrs(zone); |
| 402 | ldns_rr_list_sort(zrr); |
| 403 | } |
| 404 | |
| 405 | #if 0 |
| 406 | /** |
| 407 | * ixfr function. Work on a ldns_zone and remove and add |
| 408 | * the rrs from the rrlist |
| 409 | * \param[in] z the zone to work on |
| 410 | * \param[in] del rr_list to remove from the zone |
| 411 | * \param[in] add rr_list to add to the zone |
| 412 | * \return Tja, wat zouden we eens returnen TODO |
| 413 | */ |
| 414 | void |
| 415 | ldns_zone_ixfr_del_add(ldns_zone *z, ldns_rr_list *del, ldns_rr_list *add) |
| 416 | { |
| 417 | |
| 418 | } |
| 419 | #endif |
| 420 | |
| 421 | void |
| 422 | ldns_zone_free(ldns_zone *zone) |
| 423 | { |
| 424 | ldns_rr_list_free(zone->_rrs); |
| 425 | LDNS_FREE(zone); |
| 426 | } |
| 427 | |
| 428 | void |
| 429 | ldns_zone_deep_free(ldns_zone *zone) |
| 430 | { |
| 431 | ldns_rr_free(zone->_soa); |
| 432 | ldns_rr_list_deep_free(zone->_rrs); |
| 433 | LDNS_FREE(zone); |
| 434 | } |