/*
* services/localzone.h - local zones authority service.
*
* Copyright (c) 2007, NLnet Labs. All rights reserved.
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
*
* This file contains functions to enable local zone authority service.
*/
#ifndef SERVICES_LOCALZONE_H
#define SERVICES_LOCALZONE_H
#include "util/rbtree.h"
#include "util/locks.h"
struct ub_packed_rrset_key;
struct regional;
struct config_file;
struct edns_data;
struct query_info;
struct sldns_buffer;
/**
* Local zone type
* This type determines processing for queries that did not match
* local-data directly.
*/
enum localzone_type {
/** drop query */
local_zone_deny = 0,
/** answer with error */
local_zone_refuse,
/** answer nxdomain or nodata */
local_zone_static,
/** resolve normally */
local_zone_transparent,
/** do not block types at localdata names */
local_zone_typetransparent,
/** answer with data at zone apex */
local_zone_redirect,
/** remove default AS112 blocking contents for zone
* nodefault is used in config not during service. */
local_zone_nodefault
};
/**
* Authoritative local zones storage, shared.
*/
struct local_zones {
/** lock on the localzone tree */
lock_rw_t lock;
/** rbtree of struct local_zone */
rbtree_t ztree;
};
/**
* Local zone. A locally served authoritative zone.
*/
struct local_zone {
/** rbtree node, key is name and class */
rbnode_t node;
/** parent zone, if any. */
struct local_zone* parent;
/** zone name, in uncompressed wireformat */
uint8_t* name;
/** length of zone name */
size_t namelen;
/** number of labels in zone name */
int namelabs;
/** the class of this zone.
* uses 'dclass' to not conflict with c++ keyword class. */
uint16_t dclass;
/** lock on the data in the structure
* For the node, parent, name, namelen, namelabs, dclass, you
* need to also hold the zones_tree lock to change them (or to
* delete this zone) */
lock_rw_t lock;
/** how to process zone */
enum localzone_type type;
/** in this region the zone's data is allocated.
* the struct local_zone itself is malloced. */
struct regional* region;
/** local data for this zone
* rbtree of struct local_data */
rbtree_t data;
/** if data contains zone apex SOA data, this is a ptr to it. */
struct ub_packed_rrset_key* soa;
};
/**
* Local data. One domain name, and the RRs to go with it.
*/
struct local_data {
/** rbtree node, key is name only */
rbnode_t node;
/** domain name */
uint8_t* name;
/** length of name */
size_t namelen;
/** number of labels in name */
int namelabs;
/** the data rrsets, with different types, linked list.
* If this list is NULL, the node is an empty non-terminal. */
struct local_rrset* rrsets;
};
/**
* A local data RRset
*/
struct local_rrset {
/** next in list */
struct local_rrset* next;
/** RRset data item */
struct ub_packed_rrset_key* rrset;
};
/**
* Create local zones storage
* @return new struct or NULL on error.
*/
struct local_zones* local_zones_create(void);
/**
* Delete local zones storage
* @param zones: to delete.
*/
void local_zones_delete(struct local_zones* zones);
/**
* Apply config settings; setup the local authoritative data.
* Takes care of locking.
* @param zones: is set up.
* @param cfg: config data.
* @return false on error.
*/
int local_zones_apply_cfg(struct local_zones* zones, struct config_file* cfg);
/**
* Compare two local_zone entries in rbtree. Sort hierarchical but not
* canonical
* @param z1: zone 1
* @param z2: zone 2
* @return: -1, 0, +1 comparison value.
*/
int local_zone_cmp(const void* z1, const void* z2);
/**
* Compare two local_data entries in rbtree. Sort canonical.
* @param d1: data 1
* @param d2: data 2
* @return: -1, 0, +1 comparison value.
*/
int local_data_cmp(const void* d1, const void* d2);
/**
* Delete one zone
* @param z: to delete.
*/
void local_zone_delete(struct local_zone* z);
/**
* Lookup zone that contains the given name, class.
* User must lock the tree or result zone.
* @param zones: the zones tree
* @param name: dname to lookup
* @param len: length of name.
* @param labs: labelcount of name.
* @param dclass: class to lookup.
* @return closest local_zone or NULL if no covering zone is found.
*/
struct local_zone* local_zones_lookup(struct local_zones* zones,
uint8_t* name, size_t len, int labs, uint16_t dclass);
/**
* Debug helper. Print all zones
* Takes care of locking.
* @param zones: the zones tree
*/
void local_zones_print(struct local_zones* zones);
/**
* Answer authoritatively for local zones.
* Takes care of locking.
* @param zones: the stored zones (shared, read only).
* @param qinfo: query info (parsed).
* @param edns: edns info (parsed).
* @param buf: buffer with query ID and flags, also for reply.
* @param temp: temporary storage region.
* @return true if answer is in buffer. false if query is not answered
* by authority data. If the reply should be dropped altogether, the return
* value is true, but the buffer is cleared (empty).
*/
int local_zones_answer(struct local_zones* zones, struct query_info* qinfo,
struct edns_data* edns, struct sldns_buffer* buf, struct regional* temp);
/**
* Parse the string into localzone type.
*
* @param str: string to parse
* @param t: local zone type returned here.
* @return 0 on parse error.
*/
int local_zone_str2type(const char* str, enum localzone_type* t);
/**
* Print localzone type to a string. Pointer to a constant string.
*
* @param t: local zone type.
* @return constant string that describes type.
*/
const char* local_zone_type2str(enum localzone_type t);
/**
* Find zone that with exactly given name, class.
* User must lock the tree or result zone.
* @param zones: the zones tree
* @param name: dname to lookup
* @param len: length of name.
* @param labs: labelcount of name.
* @param dclass: class to lookup.
* @return the exact local_zone or NULL.
*/
struct local_zone* local_zones_find(struct local_zones* zones,
uint8_t* name, size_t len, int labs, uint16_t dclass);
/**
* Add a new zone. Caller must hold the zones lock.
* Adjusts the other zones as well (parent pointers) after insertion.
* The zone must NOT exist (returns NULL and logs error).
* @param zones: the zones tree
* @param name: dname to add
* @param len: length of name.
* @param labs: labelcount of name.
* @param dclass: class to add.
* @param tp: type.
* @return local_zone or NULL on error, caller must printout memory error.
*/
struct local_zone* local_zones_add_zone(struct local_zones* zones,
uint8_t* name, size_t len, int labs, uint16_t dclass,
enum localzone_type tp);
/**
* Delete a zone. Caller must hold the zones lock.
* Adjusts the other zones as well (parent pointers) after insertion.
* @param zones: the zones tree
* @param zone: the zone to delete from tree. Also deletes zone from memory.
*/
void local_zones_del_zone(struct local_zones* zones, struct local_zone* zone);
/**
* Add RR data into the localzone data.
* Looks up the zone, if no covering zone, a transparent zone with the
* name of the RR is created.
* @param zones: the zones tree. Not locked by caller.
* @param rr: string with on RR.
* @return false on failure.
*/
int local_zones_add_RR(struct local_zones* zones, const char* rr);
/**
* Remove data from domain name in the tree.
* All types are removed. No effect if zone or name does not exist.
* @param zones: zones tree.
* @param name: dname to remove
* @param len: length of name.
* @param labs: labelcount of name.
* @param dclass: class to remove.
*/
void local_zones_del_data(struct local_zones* zones,
uint8_t* name, size_t len, int labs, uint16_t dclass);
/**
* Form wireformat from text format domain name.
* @param str: the domain name in text "www.example.com"
* @param res: resulting wireformat is stored here with malloc.
* @param len: length of resulting wireformat.
* @param labs: number of labels in resulting wireformat.
* @return false on error, syntax or memory. Also logged.
*/
int parse_dname(const char* str, uint8_t** res, size_t* len, int* labs);
#endif /* SERVICES_LOCALZONE_H */
