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 60 /* 61 * Get the list of glue records in a zone 62 * XXX: there should be a way for this to return error, other than NULL, 63 * since NULL is a valid return 64 */ 65 ldns_rr_list * 66 ldns_zone_glue_rr_list(const ldns_zone *z) 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_list *glue; 84 ldns_rr *r, *ns, *a; 85 ldns_rdf *dname_a, *ns_owner; 86 size_t i,j; 87 88 zone_cuts = NULL; 89 addr = NULL; 90 glue = NULL; 91 92 /* we cannot determine glue in a 'zone' without a SOA */ 93 if (!ldns_zone_soa(z)) { 94 return NULL; 95 } 96 97 zone_cuts = ldns_rr_list_new(); 98 if (!zone_cuts) goto memory_error; 99 addr = ldns_rr_list_new(); 100 if (!addr) goto memory_error; 101 glue = ldns_rr_list_new(); 102 if (!glue) goto memory_error; 103 104 for(i = 0; i < ldns_zone_rr_count(z); i++) { 105 r = ldns_rr_list_rr(ldns_zone_rrs(z), i); 106 if (ldns_rr_get_type(r) == LDNS_RR_TYPE_A || 107 ldns_rr_get_type(r) == LDNS_RR_TYPE_AAAA) { 108 /* possibly glue */ 109 if (!ldns_rr_list_push_rr(addr, r)) goto memory_error; 110 continue; 111 } 112 if (ldns_rr_get_type(r) == LDNS_RR_TYPE_NS) { 113 /* multiple zones will end up here - 114 * for now; not a problem 115 */ 116 /* don't add NS records for the current zone itself */ 117 if (ldns_rdf_compare(ldns_rr_owner(r), 118 ldns_rr_owner(ldns_zone_soa(z))) != 0) { 119 if (!ldns_rr_list_push_rr(zone_cuts, r)) goto memory_error; 120 } 121 continue; 122 } 123 } 124 125 /* will sorting make it quicker ?? */ 126 for(i = 0; i < ldns_rr_list_rr_count(zone_cuts); i++) { 127 ns = ldns_rr_list_rr(zone_cuts, i); 128 ns_owner = ldns_rr_owner(ns); 129 130 for(j = 0; j < ldns_rr_list_rr_count(addr); j++) { 131 a = ldns_rr_list_rr(addr, j); 132 dname_a = ldns_rr_owner(a); 133 134 if (ldns_dname_is_subdomain(dname_a, ns_owner) || 135 ldns_dname_compare(dname_a, ns_owner) == 0) { 136 /* GLUE! */ 137 if (!ldns_rr_list_push_rr(glue, a)) goto memory_error; 138 } 139 } 140 } 141 142 ldns_rr_list_free(addr); 143 ldns_rr_list_free(zone_cuts); 144 145 if (ldns_rr_list_rr_count(glue) == 0) { 146 ldns_rr_list_free(glue); 147 return NULL; 148 } else { 149 return glue; 150 } 151 152 memory_error: 153 if (zone_cuts) { 154 LDNS_FREE(zone_cuts); 155 } 156 if (addr) { 157 ldns_rr_list_free(addr); 158 } 159 if (glue) { 160 ldns_rr_list_free(glue); 161 } 162 return NULL; 163 } 164 165 ldns_zone * 166 ldns_zone_new(void) 167 { 168 ldns_zone *z; 169 170 z = LDNS_MALLOC(ldns_zone); 171 if (!z) { 172 return NULL; 173 } 174 175 z->_rrs = ldns_rr_list_new(); 176 if (!z->_rrs) { 177 LDNS_FREE(z); 178 return NULL; 179 } 180 ldns_zone_set_soa(z, NULL); 181 return z; 182 } 183 184 /* we regocnize: 185 * $TTL, $ORIGIN 186 */ 187 ldns_status 188 ldns_zone_new_frm_fp(ldns_zone **z, FILE *fp, ldns_rdf *origin, uint32_t ttl, ldns_rr_class c) 189 { 190 return ldns_zone_new_frm_fp_l(z, fp, origin, ttl, c, NULL); 191 } 192 193 /* XXX: class is never used */ 194 ldns_status 195 ldns_zone_new_frm_fp_l(ldns_zone **z, FILE *fp, ldns_rdf *origin, uint32_t ttl, 196 ldns_rr_class ATTR_UNUSED(c), int *line_nr) 197 { 198 ldns_zone *newzone; 199 ldns_rr *rr; 200 uint32_t my_ttl; 201 ldns_rdf *my_origin; 202 ldns_rdf *my_prev; 203 bool soa_seen = false; /* 2 soa are an error */ 204 ldns_status s; 205 ldns_status ret; 206 207 /* most cases of error are memory problems */ 208 ret = LDNS_STATUS_MEM_ERR; 209 210 newzone = NULL; 211 my_origin = NULL; 212 my_prev = NULL; 213 214 my_ttl = ttl; 215 216 if (origin) { 217 my_origin = ldns_rdf_clone(origin); 218 if (!my_origin) goto error; 219 /* also set the prev */ 220 my_prev = ldns_rdf_clone(origin); 221 if (!my_prev) goto error; 222 } 223 224 newzone = ldns_zone_new(); 225 if (!newzone) goto error; 226 227 while(!feof(fp)) { 228 s = ldns_rr_new_frm_fp_l(&rr, fp, &my_ttl, &my_origin, &my_prev, line_nr); 229 switch (s) { 230 case LDNS_STATUS_OK: 231 if (ldns_rr_get_type(rr) == LDNS_RR_TYPE_SOA) { 232 if (soa_seen) { 233 /* second SOA 234 * just skip, maybe we want to say 235 * something??? */ 236 ldns_rr_free(rr); 237 continue; 238 } 239 soa_seen = true; 240 ldns_zone_set_soa(newzone, rr); 241 /* set origin to soa if not specified */ 242 if (!my_origin) { 243 my_origin = ldns_rdf_clone(ldns_rr_owner(rr)); 244 } 245 continue; 246 } 247 248 /* a normal RR - as sofar the DNS is normal */ 249 if (!ldns_zone_push_rr(newzone, rr)) goto error; 250 251 case LDNS_STATUS_SYNTAX_EMPTY: 252 /* empty line was seen */ 253 case LDNS_STATUS_SYNTAX_TTL: 254 /* the function set the ttl */ 255 break; 256 case LDNS_STATUS_SYNTAX_ORIGIN: 257 /* the function set the origin */ 258 break; 259 case LDNS_STATUS_SYNTAX_INCLUDE: 260 ret = LDNS_STATUS_SYNTAX_INCLUDE_ERR_NOTIMPL; 261 break; 262 default: 263 ret = s; 264 goto error; 265 } 266 } 267 268 if (my_origin) { 269 ldns_rdf_deep_free(my_origin); 270 } 271 if (my_prev) { 272 ldns_rdf_deep_free(my_prev); 273 } 274 if (z) { 275 *z = newzone; 276 } else { 277 ldns_zone_free(newzone); 278 } 279 280 return LDNS_STATUS_OK; 281 282 error: 283 if (my_origin) { 284 ldns_rdf_deep_free(my_origin); 285 } 286 if (my_prev) { 287 ldns_rdf_deep_free(my_prev); 288 } 289 if (newzone) { 290 ldns_zone_free(newzone); 291 } 292 return ret; 293 } 294 295 void 296 ldns_zone_sort(ldns_zone *zone) 297 { 298 ldns_rr_list *zrr; 299 assert(zone != NULL); 300 301 zrr = ldns_zone_rrs(zone); 302 ldns_rr_list_sort(zrr); 303 } 304 305 void 306 ldns_zone_free(ldns_zone *zone) 307 { 308 ldns_rr_list_free(zone->_rrs); 309 LDNS_FREE(zone); 310 } 311 312 void 313 ldns_zone_deep_free(ldns_zone *zone) 314 { 315 ldns_rr_free(zone->_soa); 316 ldns_rr_list_deep_free(zone->_rrs); 317 LDNS_FREE(zone); 318 } 319