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/*
* Copyright (C) 2004, 2005 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2001-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: builtin.c,v 1.5.18.5 2005/08/23 04:12:38 marka Exp $ */
/*! \file
* \brief
* The built-in "version", "hostname", "id", "authors" and "empty" databases.
*/
#include <config.h>
#include <string.h>
#include <stdio.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/util.h>
#include <dns/result.h>
#include <dns/sdb.h>
#include <named/builtin.h>
#include <named/globals.h>
#include <named/server.h>
#include <named/os.h>
typedef struct builtin builtin_t;
static isc_result_t do_version_lookup(dns_sdblookup_t *lookup);
static isc_result_t do_hostname_lookup(dns_sdblookup_t *lookup);
static isc_result_t do_authors_lookup(dns_sdblookup_t *lookup);
static isc_result_t do_id_lookup(dns_sdblookup_t *lookup);
static isc_result_t do_empty_lookup(dns_sdblookup_t *lookup);
/*
* We can't use function pointers as the db_data directly
* because ANSI C does not guarantee that function pointers
* can safely be cast to void pointers and back.
*/
struct builtin {
isc_result_t (*do_lookup)(dns_sdblookup_t *lookup);
char *server;
char *contact;
};
static builtin_t version_builtin = { do_version_lookup, NULL, NULL };
static builtin_t hostname_builtin = { do_hostname_lookup, NULL, NULL };
static builtin_t authors_builtin = { do_authors_lookup, NULL, NULL };
static builtin_t id_builtin = { do_id_lookup, NULL, NULL };
static builtin_t empty_builtin = { do_empty_lookup, NULL, NULL };
static dns_sdbimplementation_t *builtin_impl;
static isc_result_t
builtin_lookup(const char *zone, const char *name, void *dbdata,
dns_sdblookup_t *lookup)
{
builtin_t *b = (builtin_t *) dbdata;
UNUSED(zone);
if (strcmp(name, "@") == 0)
return (b->do_lookup(lookup));
else
return (ISC_R_NOTFOUND);
}
static isc_result_t
put_txt(dns_sdblookup_t *lookup, const char *text) {
unsigned char buf[256];
unsigned int len = strlen(text);
if (len > 255)
len = 255; /* Silently truncate */
buf[0] = len;
memcpy(&buf[1], text, len);
return (dns_sdb_putrdata(lookup, dns_rdatatype_txt, 0, buf, len + 1));
}
static isc_result_t
do_version_lookup(dns_sdblookup_t *lookup) {
if (ns_g_server->version_set) {
if (ns_g_server->version == NULL)
return (ISC_R_SUCCESS);
else
return (put_txt(lookup, ns_g_server->version));
} else {
return (put_txt(lookup, ns_g_version));
}
}
static isc_result_t
do_hostname_lookup(dns_sdblookup_t *lookup) {
if (ns_g_server->hostname_set) {
if (ns_g_server->hostname == NULL)
return (ISC_R_SUCCESS);
else
return (put_txt(lookup, ns_g_server->hostname));
} else {
char buf[256];
isc_result_t result = ns_os_gethostname(buf, sizeof(buf));
if (result != ISC_R_SUCCESS)
return (result);
return (put_txt(lookup, buf));
}
}
static isc_result_t
do_authors_lookup(dns_sdblookup_t *lookup) {
isc_result_t result;
const char **p;
static const char *authors[] = {
"Mark Andrews",
"James Brister",
"Ben Cottrell",
"Michael Graff",
"Andreas Gustafsson",
"Bob Halley",
"David Lawrence",
"Danny Mayer",
"Damien Neil",
"Matt Nelson",
"Michael Sawyer",
"Brian Wellington",
NULL
};
/*
* If a version string is specified, disable the authors.bind zone.
*/
if (ns_g_server->version_set)
return (ISC_R_SUCCESS);
for (p = authors; *p != NULL; p++) {
result = put_txt(lookup, *p);
if (result != ISC_R_SUCCESS)
return (result);
}
return (ISC_R_SUCCESS);
}
static isc_result_t
do_id_lookup(dns_sdblookup_t *lookup) {
if (ns_g_server->server_usehostname) {
char buf[256];
isc_result_t result = ns_os_gethostname(buf, sizeof(buf));
if (result != ISC_R_SUCCESS)
return (result);
return (put_txt(lookup, buf));
}
if (ns_g_server->server_id == NULL)
return (ISC_R_SUCCESS);
else
return (put_txt(lookup, ns_g_server->server_id));
}
static isc_result_t
do_empty_lookup(dns_sdblookup_t *lookup) {
UNUSED(lookup);
return (ISC_R_SUCCESS);
}
static isc_result_t
builtin_authority(const char *zone, void *dbdata, dns_sdblookup_t *lookup) {
isc_result_t result;
const char *contact = "hostmaster";
const char *server = "@";
builtin_t *b = (builtin_t *) dbdata;
UNUSED(zone);
UNUSED(dbdata);
if (b == &empty_builtin) {
server = ".";
contact = ".";
} else {
if (b->server != NULL)
server = b->server;
if (b->contact != NULL)
contact = b->contact;
}
result = dns_sdb_putsoa(lookup, server, contact, 0);
if (result != ISC_R_SUCCESS)
return (ISC_R_FAILURE);
result = dns_sdb_putrr(lookup, "ns", 0, server);
if (result != ISC_R_SUCCESS)
return (ISC_R_FAILURE);
return (ISC_R_SUCCESS);
}
static isc_result_t
builtin_create(const char *zone, int argc, char **argv,
void *driverdata, void **dbdata)
{
REQUIRE(argc >= 1);
UNUSED(zone);
UNUSED(driverdata);
if (strcmp(argv[0], "empty") == 0) {
if (argc != 3)
return (DNS_R_SYNTAX);
} else if (argc != 1)
return (DNS_R_SYNTAX);
if (strcmp(argv[0], "version") == 0)
*dbdata = &version_builtin;
else if (strcmp(argv[0], "hostname") == 0)
*dbdata = &hostname_builtin;
else if (strcmp(argv[0], "authors") == 0)
*dbdata = &authors_builtin;
else if (strcmp(argv[0], "id") == 0)
*dbdata = &id_builtin;
else if (strcmp(argv[0], "empty") == 0) {
builtin_t *empty;
char *server;
char *contact;
/*
* We don't want built-in zones to fail. Fallback to
* the static configuration if memory allocation fails.
*/
empty = isc_mem_get(ns_g_mctx, sizeof(*empty));
server = isc_mem_strdup(ns_g_mctx, argv[1]);
contact = isc_mem_strdup(ns_g_mctx, argv[2]);
if (empty == NULL || server == NULL || contact == NULL) {
*dbdata = &empty_builtin;
if (server != NULL)
isc_mem_free(ns_g_mctx, server);
if (contact != NULL)
isc_mem_free(ns_g_mctx, contact);
if (empty != NULL)
isc_mem_put(ns_g_mctx, empty, sizeof (*empty));
} else {
memcpy(empty, &empty_builtin, sizeof (empty_builtin));
empty->server = server;
empty->contact = contact;
*dbdata = empty;
}
} else
return (ISC_R_NOTIMPLEMENTED);
return (ISC_R_SUCCESS);
}
static void
builtin_destroy(const char *zone, void *driverdata, void **dbdata) {
builtin_t *b = (builtin_t *) *dbdata;
UNUSED(zone);
UNUSED(driverdata);
/*
* Don't free the static versions.
*/
if (*dbdata == &version_builtin || *dbdata == &hostname_builtin ||
*dbdata == &authors_builtin || *dbdata == &id_builtin ||
*dbdata == &empty_builtin)
return;
isc_mem_free(ns_g_mctx, b->server);
isc_mem_free(ns_g_mctx, b->contact);
isc_mem_put(ns_g_mctx, b, sizeof (*b));
}
static dns_sdbmethods_t builtin_methods = {
builtin_lookup,
builtin_authority,
NULL, /* allnodes */
builtin_create,
builtin_destroy
};
isc_result_t
ns_builtin_init(void) {
RUNTIME_CHECK(dns_sdb_register("_builtin", &builtin_methods, NULL,
DNS_SDBFLAG_RELATIVEOWNER |
DNS_SDBFLAG_RELATIVERDATA,
ns_g_mctx, &builtin_impl)
== ISC_R_SUCCESS);
return (ISC_R_SUCCESS);
}
void
ns_builtin_deinit(void) {
dns_sdb_unregister(&builtin_impl);
}
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