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