unbound/services/localzone.h

   1 /*
   2  * services/localzone.h - local zones authority service.
   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 enable local zone authority service.
  40  */
  41
  42 #ifndef SERVICES_LOCALZONE_H
  43 #define SERVICES_LOCALZONE_H
  44 #include "util/rbtree.h"
  45 #include "util/locks.h"
  46 struct ub_packed_rrset_key;
  47 struct regional;
  48 struct config_file;
  49 struct edns_data;
  50 struct query_info;
  51 struct sldns_buffer;
  52
  53 /**
  54  * Local zone type
  55  * This type determines processing for queries that did not match
  56  * local-data directly.
  57  */
  58 enum localzone_type {
  59         /** drop query */
  60         local_zone_deny = 0,
  61         /** answer with error */
  62         local_zone_refuse,
  63         /** answer nxdomain or nodata */
  64         local_zone_static,
  65         /** resolve normally */
  66         local_zone_transparent,
  67         /** do not block types at localdata names */
  68         local_zone_typetransparent,
  69         /** answer with data at zone apex */
  70         local_zone_redirect,
  71         /** remove default AS112 blocking contents for zone
  72          * nodefault is used in config not during service. */
  73         local_zone_nodefault
  74 };
  75
  76 /**
  77  * Authoritative local zones storage, shared.
  78  */
  79 struct local_zones {
  80         /** lock on the localzone tree */
  81         lock_rw_t lock;
  82         /** rbtree of struct local_zone */
  83         rbtree_t ztree;
  84 };
  85
  86 /**
  87  * Local zone. A locally served authoritative zone.
  88  */
  89 struct local_zone {
  90         /** rbtree node, key is name and class */
  91         rbnode_t node;
  92         /** parent zone, if any. */
  93         struct local_zone* parent;
  94
  95         /** zone name, in uncompressed wireformat */
  96         uint8_t* name;
  97         /** length of zone name */
  98         size_t namelen;
  99         /** number of labels in zone name */
 100         int namelabs;
 101         /** the class of this zone.
 102          * uses 'dclass' to not conflict with c++ keyword class. */
 103         uint16_t dclass;
 104
 105         /** lock on the data in the structure
 106          * For the node, parent, name, namelen, namelabs, dclass, you
 107          * need to also hold the zones_tree lock to change them (or to
 108          * delete this zone) */
 109         lock_rw_t lock;
 110
 111         /** how to process zone */
 112         enum localzone_type type;
 113
 114         /** in this region the zone's data is allocated.
 115          * the struct local_zone itself is malloced. */
 116         struct regional* region;
 117         /** local data for this zone
 118          * rbtree of struct local_data */
 119         rbtree_t data;
 120         /** if data contains zone apex SOA data, this is a ptr to it. */
 121         struct ub_packed_rrset_key* soa;
 122 };
 123
 124 /**
 125  * Local data. One domain name, and the RRs to go with it.
 126  */
 127 struct local_data {
 128         /** rbtree node, key is name only */
 129         rbnode_t node;
 130         /** domain name */
 131         uint8_t* name;
 132         /** length of name */
 133         size_t namelen;
 134         /** number of labels in name */
 135         int namelabs;
 136         /** the data rrsets, with different types, linked list.
 137          * If this list is NULL, the node is an empty non-terminal. */
 138         struct local_rrset* rrsets;
 139 };
 140
 141 /**
 142  * A local data RRset
 143  */
 144 struct local_rrset {
 145         /** next in list */
 146         struct local_rrset* next;
 147         /** RRset data item */
 148         struct ub_packed_rrset_key* rrset;
 149 };
 150
 151 /**
 152  * Create local zones storage
 153  * @return new struct or NULL on error.
 154  */
 155 struct local_zones* local_zones_create(void);
 156
 157 /**
 158  * Delete local zones storage
 159  * @param zones: to delete.
 160  */
 161 void local_zones_delete(struct local_zones* zones);
 162
 163 /**
 164  * Apply config settings; setup the local authoritative data.
 165  * Takes care of locking.
 166  * @param zones: is set up.
 167  * @param cfg: config data.
 168  * @return false on error.
 169  */
 170 int local_zones_apply_cfg(struct local_zones* zones, struct config_file* cfg);
 171
 172 /**
 173  * Compare two local_zone entries in rbtree. Sort hierarchical but not
 174  * canonical
 175  * @param z1: zone 1
 176  * @param z2: zone 2
 177  * @return: -1, 0, +1 comparison value.
 178  */
 179 int local_zone_cmp(const void* z1, const void* z2);
 180
 181 /**
 182  * Compare two local_data entries in rbtree. Sort canonical.
 183  * @param d1: data 1
 184  * @param d2: data 2
 185  * @return: -1, 0, +1 comparison value.
 186  */
 187 int local_data_cmp(const void* d1, const void* d2);
 188
 189 /**
 190  * Delete one zone
 191  * @param z: to delete.
 192  */
 193 void local_zone_delete(struct local_zone* z);
 194
 195 /**
 196  * Lookup zone that contains the given name, class.
 197  * User must lock the tree or result zone.
 198  * @param zones: the zones tree
 199  * @param name: dname to lookup
 200  * @param len: length of name.
 201  * @param labs: labelcount of name.
 202  * @param dclass: class to lookup.
 203  * @return closest local_zone or NULL if no covering zone is found.
 204  */
 205 struct local_zone* local_zones_lookup(struct local_zones* zones,
 206         uint8_t* name, size_t len, int labs, uint16_t dclass);
 207
 208 /**
 209  * Debug helper. Print all zones
 210  * Takes care of locking.
 211  * @param zones: the zones tree
 212  */
 213 void local_zones_print(struct local_zones* zones);
 214
 215 /**
 216  * Answer authoritatively for local zones.
 217  * Takes care of locking.
 218  * @param zones: the stored zones (shared, read only).
 219  * @param qinfo: query info (parsed).
 220  * @param edns: edns info (parsed).
 221  * @param buf: buffer with query ID and flags, also for reply.
 222  * @param temp: temporary storage region.
 223  * @return true if answer is in buffer. false if query is not answered
 224  * by authority data. If the reply should be dropped altogether, the return
 225  * value is true, but the buffer is cleared (empty).
 226  */
 227 int local_zones_answer(struct local_zones* zones, struct query_info* qinfo,
 228         struct edns_data* edns, struct sldns_buffer* buf, struct regional* temp);
 229
 230 /**
 231  * Parse the string into localzone type.
 232  *
 233  * @param str: string to parse
 234  * @param t: local zone type returned here.
 235  * @return 0 on parse error.
 236  */
 237 int local_zone_str2type(const char* str, enum localzone_type* t);
 238
 239 /**
 240  * Print localzone type to a string.  Pointer to a constant string.
 241  *
 242  * @param t: local zone type.
 243  * @return constant string that describes type.
 244  */
 245 const char* local_zone_type2str(enum localzone_type t);
 246
 247 /**
 248  * Find zone that with exactly given name, class.
 249  * User must lock the tree or result zone.
 250  * @param zones: the zones tree
 251  * @param name: dname to lookup
 252  * @param len: length of name.
 253  * @param labs: labelcount of name.
 254  * @param dclass: class to lookup.
 255  * @return the exact local_zone or NULL.
 256  */
 257 struct local_zone* local_zones_find(struct local_zones* zones,
 258         uint8_t* name, size_t len, int labs, uint16_t dclass);
 259
 260 /**
 261  * Add a new zone. Caller must hold the zones lock.
 262  * Adjusts the other zones as well (parent pointers) after insertion.
 263  * The zone must NOT exist (returns NULL and logs error).
 264  * @param zones: the zones tree
 265  * @param name: dname to add
 266  * @param len: length of name.
 267  * @param labs: labelcount of name.
 268  * @param dclass: class to add.
 269  * @param tp: type.
 270  * @return local_zone or NULL on error, caller must printout memory error.
 271  */
 272 struct local_zone* local_zones_add_zone(struct local_zones* zones,
 273         uint8_t* name, size_t len, int labs, uint16_t dclass,
 274         enum localzone_type tp);
 275
 276 /**
 277  * Delete a zone. Caller must hold the zones lock.
 278  * Adjusts the other zones as well (parent pointers) after insertion.
 279  * @param zones: the zones tree
 280  * @param zone: the zone to delete from tree. Also deletes zone from memory.
 281  */
 282 void local_zones_del_zone(struct local_zones* zones, struct local_zone* zone);
 283
 284 /**
 285  * Add RR data into the localzone data.
 286  * Looks up the zone, if no covering zone, a transparent zone with the
 287  * name of the RR is created.
 288  * @param zones: the zones tree. Not locked by caller.
 289  * @param rr: string with on RR.
 290  * @return false on failure.
 291  */
 292 int local_zones_add_RR(struct local_zones* zones, const char* rr);
 293
 294 /**
 295  * Remove data from domain name in the tree.
 296  * All types are removed. No effect if zone or name does not exist.
 297  * @param zones: zones tree.
 298  * @param name: dname to remove
 299  * @param len: length of name.
 300  * @param labs: labelcount of name.
 301  * @param dclass: class to remove.
 302  */
 303 void local_zones_del_data(struct local_zones* zones,
 304         uint8_t* name, size_t len, int labs, uint16_t dclass);
 305
 306
 307 /**
 308  * Form wireformat from text format domain name.
 309  * @param str: the domain name in text "www.example.com"
 310  * @param res: resulting wireformat is stored here with malloc.
 311  * @param len: length of resulting wireformat.
 312  * @param labs: number of labels in resulting wireformat.
 313  * @return false on error, syntax or memory. Also logged.
 314  */
 315 int parse_dname(const char* str, uint8_t** res, size_t* len, int* labs);
 316
 317 #endif /* SERVICES_LOCALZONE_H */