summaryrefslogtreecommitdiffstats
path: root/contrib/unbound/services/localzone.h
blob: 29ba8663fd048448d359061473dbaaae127d9c20 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
/*
 * 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;
struct comm_reply;

/**
 * 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,
	/** log client address, but no block (transparent) */
	local_zone_inform
};

/**
 * 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.
 * @param repinfo: source address for checks. may be NULL.
 * @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,
	struct comm_reply* repinfo);

/**
 * 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 */
OpenPOWER on IntegriCloud