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- cachedb module framework (empty).

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git-svn-id: file:///svn/unbound/trunk@3698 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards 2016-04-14 14:50:18 +00:00
parent f1d01113d2
commit f103787644
10 changed files with 399 additions and 5 deletions
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14
Makefile.in
View file

@ -112,7 +112,7 @@ util/ub_event.c util/ub_event_pluggable.c util/winsock_event.c \
validator/autotrust.c validator/val_anchor.c validator/validator.c \
validator/val_kcache.c validator/val_kentry.c validator/val_neg.c \
validator/val_nsec3.c validator/val_nsec.c validator/val_secalgo.c \
validator/val_sigcrypt.c validator/val_utils.c dns64/dns64.c $(CHECKLOCK_SRC) \
validator/val_sigcrypt.c validator/val_utils.c dns64/dns64.c cachedb/cachedb.c $(CHECKLOCK_SRC) \
$(DNSTAP_SRC)
COMMON_OBJ_WITHOUT_NETCALL=dns.lo infra.lo rrset.lo dname.lo msgencode.lo \
as112.lo msgparse.lo msgreply.lo packed_rrset.lo iterator.lo iter_delegpt.lo \
@ -123,7 +123,7 @@ fptr_wlist.lo locks.lo log.lo mini_event.lo module.lo net_help.lo \
random.lo rbtree.lo regional.lo rtt.lo dnstree.lo lookup3.lo lruhash.lo \
slabhash.lo timehist.lo tube.lo winsock_event.lo autotrust.lo val_anchor.lo \
validator.lo val_kcache.lo val_kentry.lo val_neg.lo val_nsec3.lo val_nsec.lo \
val_secalgo.lo val_sigcrypt.lo val_utils.lo dns64.lo \
val_secalgo.lo val_sigcrypt.lo val_utils.lo dns64.lo cachedb.lo \
$(PYTHONMOD_OBJ) $(CHECKLOCK_OBJ) $(DNSTAP_OBJ)
COMMON_OBJ_WITHOUT_UB_EVENT=$(COMMON_OBJ_WITHOUT_NETCALL) netevent.lo listen_dnsport.lo \
outside_network.lo
@ -811,9 +811,9 @@ tube.lo tube.o: $(srcdir)/util/tube.c config.h $(srcdir)/util/tube.h $(srcdir)/u
$(srcdir)/util/netevent.h $(srcdir)/util/fptr_wlist.h $(srcdir)/util/storage/lruhash.h $(srcdir)/util/locks.h \
$(srcdir)/util/module.h $(srcdir)/util/data/msgreply.h $(srcdir)/util/data/packed_rrset.h \
$(srcdir)/util/data/msgparse.h $(srcdir)/sldns/pkthdr.h $(srcdir)/sldns/rrdef.h $(srcdir)/services/mesh.h \
$(srcdir)/util/rbtree.h $(srcdir)/services/modstack.h
$(srcdir)/util/rbtree.h $(srcdir)/services/modstack.h $(srcdir)/util/ub_event.h
ub_event.lo ub_event.o: $(srcdir)/util/ub_event.c config.h $(srcdir)/util/ub_event.h $(srcdir)/util/log.h \
$(srcdir)/util/mini_event.h $(srcdir)/util/rbtree.h
$(srcdir)/util/netevent.h $(srcdir)/util/tube.h $(srcdir)/util/mini_event.h $(srcdir)/util/rbtree.h
ub_event_pluggable.lo ub_event_pluggable.o: $(srcdir)/util/ub_event_pluggable.c config.h $(srcdir)/util/ub_event.h \
$(srcdir)/libunbound/unbound-event.h $(srcdir)/util/netevent.h $(srcdir)/util/log.h $(srcdir)/util/fptr_wlist.h \
$(srcdir)/util/storage/lruhash.h $(srcdir)/util/locks.h $(srcdir)/util/module.h $(srcdir)/util/data/msgreply.h \
@ -899,6 +899,10 @@ dns64.lo dns64.o: $(srcdir)/dns64/dns64.c config.h $(srcdir)/dns64/dns64.h $(src
$(srcdir)/util/storage/slabhash.h $(srcdir)/util/config_file.h $(srcdir)/util/fptr_wlist.h \
$(srcdir)/util/netevent.h $(srcdir)/util/tube.h $(srcdir)/services/mesh.h $(srcdir)/util/rbtree.h \
$(srcdir)/services/modstack.h $(srcdir)/util/net_help.h $(srcdir)/util/regional.h
cachedb.lo cachedb.o: $(srcdir)/cachedb/cachedb.c config.h $(srcdir)/cachedb/cachedb.h $(srcdir)/util/module.h \
$(srcdir)/util/storage/lruhash.h $(srcdir)/util/locks.h $(srcdir)/util/log.h $(srcdir)/util/data/msgreply.h \
$(srcdir)/util/data/packed_rrset.h $(srcdir)/util/data/msgparse.h $(srcdir)/sldns/pkthdr.h \
$(srcdir)/sldns/rrdef.h
checklocks.lo checklocks.o: $(srcdir)/testcode/checklocks.c config.h $(srcdir)/util/locks.h $(srcdir)/util/log.h \
$(srcdir)/testcode/checklocks.h
unitanchor.lo unitanchor.o: $(srcdir)/testcode/unitanchor.c config.h $(srcdir)/util/log.h $(srcdir)/util/data/dname.h \
@ -1182,7 +1186,7 @@ win_svc.lo win_svc.o: $(srcdir)/winrc/win_svc.c config.h $(srcdir)/winrc/win_svc
$(srcdir)/sldns/sbuffer.h $(srcdir)/util/data/packed_rrset.h $(srcdir)/util/storage/lruhash.h \
$(srcdir)/util/netevent.h $(srcdir)/util/data/msgreply.h $(srcdir)/util/data/msgparse.h $(srcdir)/sldns/pkthdr.h \
$(srcdir)/sldns/rrdef.h $(srcdir)/daemon/stats.h $(srcdir)/util/timehist.h $(srcdir)/util/module.h \
$(srcdir)/dnstap/dnstap.h $(srcdir)/daemon/remote.h $(srcdir)/util/config_file.h $(srcdir)/util/winsock_event.h
$(srcdir)/dnstap/dnstap.h $(srcdir)/daemon/remote.h $(srcdir)/util/config_file.h $(srcdir)/util/ub_event.h
w_inst.lo w_inst.o: $(srcdir)/winrc/w_inst.c config.h $(srcdir)/winrc/w_inst.h $(srcdir)/winrc/win_svc.h
unbound-service-install.lo unbound-service-install.o: $(srcdir)/winrc/unbound-service-install.c config.h \
$(srcdir)/winrc/w_inst.h

228
cachedb/cachedb.c Normal file
View file

@ -0,0 +1,228 @@
/*
* cachedb/cachedb.c - cache from a database external to the program module
*
* Copyright (c) 2016, 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 a module that uses an external database to cache
* dns responses.
*/
#include "config.h"
#ifdef USE_CACHEDB
#include "cachedb/cachedb.h"
#include "util/regional.h"
#include "sldns/parseutil.h"
#include "sldns/wire2str.h"
/** apply configuration to cachedb module 'global' state */
static int
cachedb_apply_cfg(struct cachedb_env* cachedb_env, struct config_file* cfg)
{
/* TODO */
return 1;
}
int
cachedb_init(struct module_env* env, int id)
{
struct cachedb_env* cachedb_env = (struct cachedb_env*)calloc(1,
sizeof(struct cachedb_env));
if(!cachedb_env) {
log_err("malloc failure");
return 0;
}
env->modinfo[id] = (void*)cachedb_env;
if(!cachedb_apply_cfg(cachedb_env, env->cfg)) {
log_err("cachedb: could not apply configuration settings.");
return 0;
}
return 1;
}
void
cachedb_deinit(struct module_env* env, int id)
{
struct cachedb_env* cachedb_env;
if(!env || !env->modinfo[id])
return;
cachedb_env = (struct cachedb_env*)env->modinfo[id];
/* free contents */
/* TODO */
free(cachedb_env);
env->modinfo[id] = NULL;
}
/** new query for cachedb */
static int
cachedb_new(struct module_qstate* qstate, int id)
{
struct cachedb_qstate* iq = (struct cachedb_qstate*)regional_alloc(
qstate->region, sizeof(struct cachedb_qstate));
qstate->minfo[id] = iq;
if(!iq)
return 0;
memset(iq, 0, sizeof(*iq));
/* initialise it */
/* TODO */
return 1;
}
/**
* Return an error
* @param qstate: our query state
* @param id: module id
* @param rcode: error code (DNS errcode).
* @return: 0 for use by caller, to make notation easy, like:
* return error_response(..).
*/
static int
error_response(struct module_qstate* qstate, int id, int rcode)
{
verbose(VERB_QUERY, "return error response %s",
sldns_lookup_by_id(sldns_rcodes, rcode)?
sldns_lookup_by_id(sldns_rcodes, rcode)->name:"??");
qstate->return_rcode = rcode;
qstate->return_msg = NULL;
qstate->ext_state[id] = module_finished;
return 0;
}
/**
* Handle a cachedb module event
* @param qstate: query state (from the mesh), passed between modules.
* contains qstate->env module environment with global caches and so on.
* @param iq: query state specific for this module. per-query.
* @param ie: environment specific for this module. global.
* @param id: module id.
*/
static void
cachedb_handle(struct module_qstate* qstate, struct cachedb_qstate* iq,
struct cachedb_env* ie, int id)
{
/* figure out if this is a lookup or a store moment */
/* TODO */
}
void
cachedb_operate(struct module_qstate* qstate, enum module_ev event, int id,
struct outbound_entry* outbound)
{
struct cachedb_env* ie = (struct cachedb_env*)qstate->env->modinfo[id];
struct cachedb_qstate* iq = (struct cachedb_qstate*)qstate->minfo[id];
verbose(VERB_QUERY, "cachedb[module %d] operate: extstate:%s event:%s",
id, strextstate(qstate->ext_state[id]), strmodulevent(event));
if(iq) log_query_info(VERB_QUERY, "cachedb operate: query",
&qstate->qinfo);
/* perform cachedb state machine */
if((event == module_event_new || event == module_event_pass) &&
iq == NULL) {
if(!cachedb_new(qstate, id)) {
(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
return;
}
iq = (struct cachedb_qstate*)qstate->minfo[id];
cachedb_handle(qstate, iq, ie, id);
return;
}
if(iq && event == module_event_pass) {
cachedb_handle(qstate, iq, ie, id);
return;
}
if(iq && outbound) {
/* cachedb does not need to process responses at this time
* ignore it.
cachedb_process_response(qstate, iq, ie, id, outbound, event);
*/
return;
}
if(event == module_event_error) {
verbose(VERB_ALGO, "got called with event error, giving up");
(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
return;
}
log_err("bad event for cachedb");
(void)error_response(qstate, id, LDNS_RCODE_SERVFAIL);
}
void
cachedb_inform_super(struct module_qstate* ATTR_UNUSED(qstate),
int ATTR_UNUSED(id), struct module_qstate* ATTR_UNUSED(super))
{
/* cachedb does not use subordinate requests at this time */
}
void
cachedb_clear(struct module_qstate* qstate, int id)
{
struct cachedb_qstate* iq;
if(!qstate)
return;
iq = (struct cachedb_qstate*)qstate->minfo[id];
if(iq) {
/* free contents of iq */
/* TODO */
}
qstate->minfo[id] = NULL;
}
size_t
cachedb_get_mem(struct module_env* env, int id)
{
struct cachedb_env* ie = (struct cachedb_env*)env->modinfo[id];
if(!ie)
return 0;
return sizeof(*ie); /* TODO - more mem */
}
/**
* The cachedb function block
*/
static struct module_func_block cachedb_block = {
"cachedb",
&cachedb_init, &cachedb_deinit, &cachedb_operate,
&cachedb_inform_super, &cachedb_clear, &cachedb_get_mem
};
struct module_func_block*
cachedb_get_funcblock(void)
{
return &cachedb_block;
}
#endif /* USE_CACHEDB */

80
cachedb/cachedb.h Normal file
View file

@ -0,0 +1,80 @@
/*
* cachedb/cachedb.h - cache from a database external to the program module
*
* Copyright (c) 2016, 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 a module that uses an external database to cache
* dns responses.
*/
#include "util/module.h"
/**
* The global variable environment contents for the cachedb
* Shared between threads, this represents long term information.
* Like database connections.
*/
struct cachedb_env {
int todo;
};
/**
* Per query state for the cachedb module.
*/
struct cachedb_qstate {
int todo;
};
/** Init the cachedb module */
int cachedb_init(struct module_env* env, int id);
/** Deinit the cachedb module */
void cachedb_deinit(struct module_env* env, int id);
/** Operate on an event on a query (in qstate). */
void cachedb_operate(struct module_qstate* qstate, enum module_ev event,
int id, struct outbound_entry* outbound);
/** Subordinate query done, inform this super request of its conclusion */
void cachedb_inform_super(struct module_qstate* qstate, int id,
struct module_qstate* super);
/** clear the cachedb query-specific contents out of qstate */
void cachedb_clear(struct module_qstate* qstate, int id);
/** return memory estimate for cachedb module */
size_t cachedb_get_mem(struct module_env* env, int id);
/**
* Get the function block with pointers to the cachedb functions
* @return the function block for "cachedb".
*/
struct module_func_block* cachedb_get_funcblock(void);

3
config.h.in
View file

@ -586,6 +586,9 @@
/* define this to enable debug checks. */
#undef UNBOUND_DEBUG
/* Define to 1 to use cachedb support */
#undef USE_CACHEDB
/* Define to 1 to enable dnstap support */
#undef USE_DNSTAP

20
configure vendored
View file

@ -843,6 +843,7 @@ enable_dnstap
with_dnstap_socket_path
with_protobuf_c
with_libfstrm
enable_cachedb
with_libunbound_only
'
ac_precious_vars='build_alias
@ -1507,6 +1508,8 @@ Optional Features:
to it, smaller install size but libunbound export
table is polluted by internal symbols
--enable-dnstap Enable dnstap support (requires fstrm, protobuf-c)
--enable-cachedb enable cachedb module that can use external cache
storage
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
@ -19626,6 +19629,23 @@ _ACEOF
fi
# check for cachedb if requested
# Check whether --enable-cachedb was given.
if test "${enable_cachedb+set}" = set; then :
enableval=$enable_cachedb;
fi
case "$enable_cachedb" in
yes)
$as_echo "#define USE_CACHEDB 1" >>confdefs.h
;;
no|*)
# nothing
;;
esac
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if ${MAKE:-make} supports $< with implicit rule in scope" >&5
$as_echo_n "checking if ${MAKE:-make} supports $< with implicit rule in scope... " >&6; }
# on openBSD, the implicit rule make $< work.

11
configure.ac
View file

@ -1227,6 +1227,17 @@ dt_DNSTAP([$UNBOUND_RUN_DIR/dnstap.sock],
]
)
# check for cachedb if requested
AC_ARG_ENABLE(cachedb, AC_HELP_STRING([--enable-cachedb], [enable cachedb module that can use external cache storage]))
case "$enable_cachedb" in
yes)
AC_DEFINE([USE_CACHEDB], [1], [Define to 1 to use cachedb support])
;;
no|*)
# nothing
;;
esac
AC_MSG_CHECKING([if ${MAKE:-make} supports $< with implicit rule in scope])
# on openBSD, the implicit rule make $< work.
# on Solaris, it does not work ($? is changed sources, $^ lists dependencies).

3
doc/Changelog
View file

@ -1,3 +1,6 @@
14 April 2016: Wouter
- cachedb module framework (empty).
12 April 2016: Wouter
- Fix #753: document dump_requestlist is for first thread.

9
services/modstack.c
View file

@ -50,6 +50,9 @@
#ifdef WITH_PYTHONMODULE
#include "pythonmod/pythonmod.h"
#endif
#ifdef USE_CACHEDB
#include "cachedb/cachedb.h"
#endif
/** count number of modules (words) in the string */
static int
@ -120,6 +123,9 @@ module_list_avail(void)
"dns64",
#ifdef WITH_PYTHONMODULE
"python",
#endif
#ifdef USE_CACHEDB
"cachedb",
#endif
"validator",
"iterator",
@ -138,6 +144,9 @@ module_funcs_avail(void)
&dns64_get_funcblock,
#ifdef WITH_PYTHONMODULE
&pythonmod_get_funcblock,
#endif
#ifdef USE_CACHEDB
&cachedb_get_funcblock,
#endif
&val_get_funcblock,
&iter_get_funcblock,

15
smallapp/unbound-checkconf.c
View file

@ -411,6 +411,21 @@ morechecks(struct config_file* cfg, const char* fname)
&& strcmp(cfg->module_conf, "dns64 validator python iterator") != 0
&& strcmp(cfg->module_conf, "python dns64 iterator") != 0
&& strcmp(cfg->module_conf, "python dns64 validator iterator") != 0
#endif
#ifdef USE_CACHEDB
&& strcmp(cfg->module_conf, "validator cachedb iterator") != 0
&& strcmp(cfg->module_conf, "cachedb iterator") != 0
&& strcmp(cfg->module_conf, "dns64 validator cachedb iterator") != 0
&& strcmp(cfg->module_conf, "dns64 cachedb iterator") != 0
&& strcmp(cfg->module_conf, "python dns64 cachedb iterator") != 0
&& strcmp(cfg->module_conf, "python dns64 validator cachedb iterator") != 0
&& strcmp(cfg->module_conf, "dns64 python cachedb iterator") != 0
&& strcmp(cfg->module_conf, "dns64 python validator cachedb iterator") != 0
&& strcmp(cfg->module_conf, "python cachedb iterator") != 0
&& strcmp(cfg->module_conf, "python validator cachedb iterator") != 0
&& strcmp(cfg->module_conf, "cachedb python iterator") != 0
&& strcmp(cfg->module_conf, "validator cachedb python iterator") != 0
&& strcmp(cfg->module_conf, "validator python cachedb iterator") != 0
#endif
) {
fatal_exit("module conf '%s' is not known to work",

21
util/fptr_wlist.c
View file

@ -78,6 +78,9 @@
#ifdef WITH_PYTHONMODULE
#include "pythonmod/pythonmod.h"
#endif
#ifdef USE_CACHEDB
#include "cachedb/cachedb.h"
#endif
int
fptr_whitelist_comm_point(comm_point_callback_t *fptr)
@ -314,6 +317,9 @@ fptr_whitelist_mod_init(int (*fptr)(struct module_env* env, int id))
else if(fptr == &dns64_init) return 1;
#ifdef WITH_PYTHONMODULE
else if(fptr == &pythonmod_init) return 1;
#endif
#ifdef USE_CACHEDB
else if(fptr == &cachedb_init) return 1;
#endif
return 0;
}
@ -326,6 +332,9 @@ fptr_whitelist_mod_deinit(void (*fptr)(struct module_env* env, int id))
else if(fptr == &dns64_deinit) return 1;
#ifdef WITH_PYTHONMODULE
else if(fptr == &pythonmod_deinit) return 1;
#endif
#ifdef USE_CACHEDB
else if(fptr == &cachedb_deinit) return 1;
#endif
return 0;
}
@ -339,6 +348,9 @@ fptr_whitelist_mod_operate(void (*fptr)(struct module_qstate* qstate,
else if(fptr == &dns64_operate) return 1;
#ifdef WITH_PYTHONMODULE
else if(fptr == &pythonmod_operate) return 1;
#endif
#ifdef USE_CACHEDB
else if(fptr == &cachedb_operate) return 1;
#endif
return 0;
}
@ -352,6 +364,9 @@ fptr_whitelist_mod_inform_super(void (*fptr)(
else if(fptr == &dns64_inform_super) return 1;
#ifdef WITH_PYTHONMODULE
else if(fptr == &pythonmod_inform_super) return 1;
#endif
#ifdef USE_CACHEDB
else if(fptr == &cachedb_inform_super) return 1;
#endif
return 0;
}
@ -365,6 +380,9 @@ fptr_whitelist_mod_clear(void (*fptr)(struct module_qstate* qstate,
else if(fptr == &dns64_clear) return 1;
#ifdef WITH_PYTHONMODULE
else if(fptr == &pythonmod_clear) return 1;
#endif
#ifdef USE_CACHEDB
else if(fptr == &cachedb_clear) return 1;
#endif
return 0;
}
@ -377,6 +395,9 @@ fptr_whitelist_mod_get_mem(size_t (*fptr)(struct module_env* env, int id))
else if(fptr == &dns64_get_mem) return 1;
#ifdef WITH_PYTHONMODULE
else if(fptr == &pythonmod_get_mem) return 1;
#endif
#ifdef USE_CACHEDB
else if(fptr == &cachedb_get_mem) return 1;
#endif
return 0;
}