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
|
/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#pragma once
/*****
***** Module Info
*****/
/*! \file dns/sdb.h
* \brief
* Simple database API.
*/
/***
*** Imports
***/
#include <inttypes.h>
#include <isc/lang.h>
#include <dns/clientinfo.h>
#include <dns/types.h>
/***
*** Types
***/
/*%
* A simple database. This is an opaque type.
*/
typedef struct dns_sdb dns_sdb_t;
/*%
* A simple database lookup in progress. This is an opaque type.
*/
typedef struct dns_sdblookup dns_sdblookup_t;
/*%
* A simple database traversal in progress. This is an opaque type.
*/
typedef struct dns_sdballnodes dns_sdballnodes_t;
typedef isc_result_t (*dns_sdblookupfunc_t)(const char *zone, const char *name,
void *dbdata,
dns_sdblookup_t *lookup,
dns_clientinfomethods_t *methods,
dns_clientinfo_t *clientinfo);
typedef isc_result_t (*dns_sdblookup2func_t)(const dns_name_t *zone,
const dns_name_t *name,
void *dbdata,
dns_sdblookup_t *lookup,
dns_clientinfomethods_t *methods,
dns_clientinfo_t *clientinfo);
typedef isc_result_t (*dns_sdbauthorityfunc_t)(const char *zone, void *dbdata,
dns_sdblookup_t *);
typedef isc_result_t (*dns_sdballnodesfunc_t)(const char *zone, void *dbdata,
dns_sdballnodes_t *allnodes);
typedef isc_result_t (*dns_sdbcreatefunc_t)(const char *zone, int argc,
char **argv, void *driverdata,
void **dbdata);
typedef void (*dns_sdbdestroyfunc_t)(const char *zone, void *driverdata,
void **dbdata);
typedef struct dns_sdbmethods {
dns_sdblookupfunc_t lookup;
dns_sdbauthorityfunc_t authority;
dns_sdballnodesfunc_t allnodes;
dns_sdbcreatefunc_t create;
dns_sdbdestroyfunc_t destroy;
dns_sdblookup2func_t lookup2;
} dns_sdbmethods_t;
/***
*** Functions
***/
ISC_LANG_BEGINDECLS
#define DNS_SDBFLAG_RELATIVEOWNER 0x00000001U
#define DNS_SDBFLAG_RELATIVERDATA 0x00000002U
#define DNS_SDBFLAG_THREADSAFE 0x00000004U
#define DNS_SDBFLAG_DNS64 0x00000008U
isc_result_t
dns_sdb_register(const char *drivername, const dns_sdbmethods_t *methods,
void *driverdata, unsigned int flags, isc_mem_t *mctx,
dns_sdbimplementation_t **sdbimp);
/*%<
* Register a simple database driver for the database type 'drivername',
* implemented by the functions in '*methods'.
*
* sdbimp must point to a NULL dns_sdbimplementation_t pointer. That is,
* sdbimp != NULL && *sdbimp == NULL. It will be assigned a value that
* will later be used to identify the driver when deregistering it.
*
* The name server will perform lookups in the database by calling the
* function 'lookup', passing it a printable zone name 'zone', a printable
* domain name 'name', and a copy of the argument 'dbdata' that
* was potentially returned by the create function. The 'dns_sdblookup_t'
* argument to 'lookup' and 'authority' is an opaque pointer to be passed to
* ns_sdb_putrr().
*
* The lookup function returns the lookup results to the name server
* by calling ns_sdb_putrr() once for each record found. On success,
* the return value of the lookup function should be ISC_R_SUCCESS.
* If the domain name 'name' does not exist, the lookup function should
* ISC_R_NOTFOUND. Any other return value is treated as an error.
*
* Lookups at the zone apex will cause the server to also call the
* function 'authority' (if non-NULL), which must provide an SOA record
* and NS records for the zone by calling ns_sdb_putrr() once for each of
* these records. The 'authority' function may be NULL if invoking
* the 'lookup' function on the zone apex will return SOA and NS records.
*
* The allnodes function, if non-NULL, fills in an opaque structure to be
* used by a database iterator. This allows the zone to be transferred.
* This may use a considerable amount of memory for large zones, and the
* zone transfer may not be fully RFC1035 compliant if the zone is
* frequently changed.
*
* The create function will be called for each zone configured
* into the name server using this database type. It can be used
* to create a "database object" containing zone specific data,
* which can make use of the database arguments specified in the
* name server configuration.
*
* The destroy function will be called to free the database object
* when its zone is destroyed.
*
* The create and destroy functions may be NULL.
*
* If flags includes DNS_SDBFLAG_RELATIVEOWNER, the lookup and authority
* functions will be called with relative names rather than absolute names.
* The string "@" represents the zone apex in this case.
*
* If flags includes DNS_SDBFLAG_RELATIVERDATA, the rdata strings may
* include relative names. Otherwise, all names in the rdata string must
* be absolute. Be aware that if relative names are allowed, any
* absolute names must contain a trailing dot.
*
* If flags includes DNS_SDBFLAG_THREADSAFE, the driver must be able to
* handle multiple lookups in parallel. Otherwise, calls into the driver
* are serialized.
*/
void
dns_sdb_unregister(dns_sdbimplementation_t **sdbimp);
/*%<
* Removes the simple database driver from the list of registered database
* types. There must be no active databases of this type when this function
* is called.
*/
/*% See dns_sdb_putradata() */
isc_result_t
dns_sdb_putrr(dns_sdblookup_t *lookup, const char *type, dns_ttl_t ttl,
const char *data);
isc_result_t
dns_sdb_putrdata(dns_sdblookup_t *lookup, dns_rdatatype_t type, dns_ttl_t ttl,
const unsigned char *rdata, unsigned int rdlen);
/*%<
* Add a single resource record to the lookup structure to be
* returned in the query response. dns_sdb_putrr() takes the
* resource record in master file text format as a null-terminated
* string, and dns_sdb_putrdata() takes the raw RDATA in
* uncompressed wire format.
*/
/*% See dns_sdb_putnamerdata() */
isc_result_t
dns_sdb_putnamedrr(dns_sdballnodes_t *allnodes, const char *name,
const char *type, dns_ttl_t ttl, const char *data);
isc_result_t
dns_sdb_putnamedrdata(dns_sdballnodes_t *allnodes, const char *name,
dns_rdatatype_t type, dns_ttl_t ttl, const void *rdata,
unsigned int rdlen);
/*%<
* Add a single resource record to the allnodes structure to be
* included in a zone transfer response, in text or wire
* format as above.
*/
isc_result_t
dns_sdb_putsoa(dns_sdblookup_t *lookup, const char *mname, const char *rname,
uint32_t serial);
/*%<
* This function may optionally be called from the 'authority' callback
* to simplify construction of the SOA record for 'zone'. It will
* provide a SOA listing 'mname' as as the primary server and 'rname' as
* the responsible person mailbox. It is the responsibility of the
* driver to increment the serial number between responses if necessary.
* All other SOA fields will have reasonable default values.
*/
ISC_LANG_ENDDECLS
|
