2 * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 2001-2003 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
18 /* $Id: builtin.c,v 1.12 2007/06/19 23:46:59 tbox Exp $ */
22 * The built-in "version", "hostname", "id", "authors" and "empty" databases.
31 #include <isc/print.h>
32 #include <isc/result.h>
35 #include <dns/result.h>
38 #include <named/builtin.h>
39 #include <named/globals.h>
40 #include <named/server.h>
43 typedef struct builtin builtin_t
;
45 static isc_result_t
do_version_lookup(dns_sdblookup_t
*lookup
);
46 static isc_result_t
do_hostname_lookup(dns_sdblookup_t
*lookup
);
47 static isc_result_t
do_authors_lookup(dns_sdblookup_t
*lookup
);
48 static isc_result_t
do_id_lookup(dns_sdblookup_t
*lookup
);
49 static isc_result_t
do_empty_lookup(dns_sdblookup_t
*lookup
);
52 * We can't use function pointers as the db_data directly
53 * because ANSI C does not guarantee that function pointers
54 * can safely be cast to void pointers and back.
58 isc_result_t (*do_lookup
)(dns_sdblookup_t
*lookup
);
63 static builtin_t version_builtin
= { do_version_lookup
, NULL
, NULL
};
64 static builtin_t hostname_builtin
= { do_hostname_lookup
, NULL
, NULL
};
65 static builtin_t authors_builtin
= { do_authors_lookup
, NULL
, NULL
};
66 static builtin_t id_builtin
= { do_id_lookup
, NULL
, NULL
};
67 static builtin_t empty_builtin
= { do_empty_lookup
, NULL
, NULL
};
69 static dns_sdbimplementation_t
*builtin_impl
;
72 builtin_lookup(const char *zone
, const char *name
, void *dbdata
,
73 dns_sdblookup_t
*lookup
)
75 builtin_t
*b
= (builtin_t
*) dbdata
;
79 if (strcmp(name
, "@") == 0)
80 return (b
->do_lookup(lookup
));
82 return (ISC_R_NOTFOUND
);
86 put_txt(dns_sdblookup_t
*lookup
, const char *text
) {
87 unsigned char buf
[256];
88 unsigned int len
= strlen(text
);
90 len
= 255; /* Silently truncate */
92 memcpy(&buf
[1], text
, len
);
93 return (dns_sdb_putrdata(lookup
, dns_rdatatype_txt
, 0, buf
, len
+ 1));
97 do_version_lookup(dns_sdblookup_t
*lookup
) {
98 if (ns_g_server
->version_set
) {
99 if (ns_g_server
->version
== NULL
)
100 return (ISC_R_SUCCESS
);
102 return (put_txt(lookup
, ns_g_server
->version
));
104 return (put_txt(lookup
, ns_g_version
));
109 do_hostname_lookup(dns_sdblookup_t
*lookup
) {
110 if (ns_g_server
->hostname_set
) {
111 if (ns_g_server
->hostname
== NULL
)
112 return (ISC_R_SUCCESS
);
114 return (put_txt(lookup
, ns_g_server
->hostname
));
117 isc_result_t result
= ns_os_gethostname(buf
, sizeof(buf
));
118 if (result
!= ISC_R_SUCCESS
)
120 return (put_txt(lookup
, buf
));
125 do_authors_lookup(dns_sdblookup_t
*lookup
) {
128 static const char *authors
[] = {
133 "Andreas Gustafsson",
145 * If a version string is specified, disable the authors.bind zone.
147 if (ns_g_server
->version_set
)
148 return (ISC_R_SUCCESS
);
150 for (p
= authors
; *p
!= NULL
; p
++) {
151 result
= put_txt(lookup
, *p
);
152 if (result
!= ISC_R_SUCCESS
)
155 return (ISC_R_SUCCESS
);
159 do_id_lookup(dns_sdblookup_t
*lookup
) {
161 if (ns_g_server
->server_usehostname
) {
163 isc_result_t result
= ns_os_gethostname(buf
, sizeof(buf
));
164 if (result
!= ISC_R_SUCCESS
)
166 return (put_txt(lookup
, buf
));
169 if (ns_g_server
->server_id
== NULL
)
170 return (ISC_R_SUCCESS
);
172 return (put_txt(lookup
, ns_g_server
->server_id
));
176 do_empty_lookup(dns_sdblookup_t
*lookup
) {
179 return (ISC_R_SUCCESS
);
183 builtin_authority(const char *zone
, void *dbdata
, dns_sdblookup_t
*lookup
) {
185 const char *contact
= "hostmaster";
186 const char *server
= "@";
187 builtin_t
*b
= (builtin_t
*) dbdata
;
192 if (b
== &empty_builtin
) {
196 if (b
->server
!= NULL
)
198 if (b
->contact
!= NULL
)
199 contact
= b
->contact
;
202 result
= dns_sdb_putsoa(lookup
, server
, contact
, 0);
203 if (result
!= ISC_R_SUCCESS
)
204 return (ISC_R_FAILURE
);
206 result
= dns_sdb_putrr(lookup
, "ns", 0, server
);
207 if (result
!= ISC_R_SUCCESS
)
208 return (ISC_R_FAILURE
);
210 return (ISC_R_SUCCESS
);
214 builtin_create(const char *zone
, int argc
, char **argv
,
215 void *driverdata
, void **dbdata
)
222 if (strcmp(argv
[0], "empty") == 0) {
224 return (DNS_R_SYNTAX
);
225 } else if (argc
!= 1)
226 return (DNS_R_SYNTAX
);
228 if (strcmp(argv
[0], "version") == 0)
229 *dbdata
= &version_builtin
;
230 else if (strcmp(argv
[0], "hostname") == 0)
231 *dbdata
= &hostname_builtin
;
232 else if (strcmp(argv
[0], "authors") == 0)
233 *dbdata
= &authors_builtin
;
234 else if (strcmp(argv
[0], "id") == 0)
235 *dbdata
= &id_builtin
;
236 else if (strcmp(argv
[0], "empty") == 0) {
241 * We don't want built-in zones to fail. Fallback to
242 * the static configuration if memory allocation fails.
244 empty
= isc_mem_get(ns_g_mctx
, sizeof(*empty
));
245 server
= isc_mem_strdup(ns_g_mctx
, argv
[1]);
246 contact
= isc_mem_strdup(ns_g_mctx
, argv
[2]);
247 if (empty
== NULL
|| server
== NULL
|| contact
== NULL
) {
248 *dbdata
= &empty_builtin
;
250 isc_mem_free(ns_g_mctx
, server
);
252 isc_mem_free(ns_g_mctx
, contact
);
254 isc_mem_put(ns_g_mctx
, empty
, sizeof (*empty
));
256 memcpy(empty
, &empty_builtin
, sizeof (empty_builtin
));
257 empty
->server
= server
;
258 empty
->contact
= contact
;
262 return (ISC_R_NOTIMPLEMENTED
);
263 return (ISC_R_SUCCESS
);
267 builtin_destroy(const char *zone
, void *driverdata
, void **dbdata
) {
268 builtin_t
*b
= (builtin_t
*) *dbdata
;
274 * Don't free the static versions.
276 if (*dbdata
== &version_builtin
|| *dbdata
== &hostname_builtin
||
277 *dbdata
== &authors_builtin
|| *dbdata
== &id_builtin
||
278 *dbdata
== &empty_builtin
)
281 isc_mem_free(ns_g_mctx
, b
->server
);
282 isc_mem_free(ns_g_mctx
, b
->contact
);
283 isc_mem_put(ns_g_mctx
, b
, sizeof (*b
));
286 static dns_sdbmethods_t builtin_methods
= {
295 ns_builtin_init(void) {
296 RUNTIME_CHECK(dns_sdb_register("_builtin", &builtin_methods
, NULL
,
297 DNS_SDBFLAG_RELATIVEOWNER
|
298 DNS_SDBFLAG_RELATIVERDATA
,
299 ns_g_mctx
, &builtin_impl
)
301 return (ISC_R_SUCCESS
);
305 ns_builtin_deinit(void) {
306 dns_sdb_unregister(&builtin_impl
);