/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2014 Instituto Nokia de Tecnologia - INdT
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <string.h>
#include <sys/signalfd.h>
#include <glib.h>
#include <dbus/dbus.h>
#include "gdbus/gdbus.h"
#include "src/error.h"
#define GATT_MGR_IFACE "org.bluez.GattManager1"
#define GATT_SERVICE_IFACE "org.bluez.GattService1"
#define GATT_CHR_IFACE "org.bluez.GattCharacteristic1"
#define GATT_DESCRIPTOR_IFACE "org.bluez.GattDescriptor1"
/* Immediate Alert Service UUID */
#define IAS_UUID "00001802-0000-1000-8000-00805f9b34fb"
#define ALERT_LEVEL_CHR_UUID "00002a06-0000-1000-8000-00805f9b34fb"
#define IAS_UUID1 "A00B"
#define IAS_UUID2 "A00C"
#define IAS_UUID3 "A00D"
#define ALERT_LEVEL_CHR_UUID1 "00002b06-0000-1000-8000-00805f9b34fb"
#define ALERT_LEVEL_CHR_UUID2 "00002c07-0000-1000-8000-00805f9b34fb"
/* Random UUID for testing purpose */
/* Random UUID for testing purpose */
#define READ_WRITE_DESCRIPTOR_UUID "8260c653-1a54-426b-9e36-e84c238bc669"
#define READ_WRITE_DESCRIPTOR_UUID1 "0260c653-1a54-426b-9e36-e84c238bc669"
#define READ_WRITE_DESCRIPTOR_UUID2 "FFFF"
static GMainLoop *main_loop;
static GSList *services;
static DBusConnection *connection;
struct characteristic {
char *service;
char *uuid;
char *path;
uint8_t *value;
int vlen;
const char **props;
};
struct descriptor {
struct characteristic *chr;
char *uuid;
char *path;
uint8_t *value;
int vlen;
const char **props;
};
/*
* Alert Level support Write Without Response only. Supported
* properties are defined at doc/gatt-api.txt. See "Flags"
* property of the GattCharacteristic1.
*/
static const char *ias_alert_level_props[] = { "write-without-response", NULL };
static const char *desc_props[] = { "read", "write", NULL };
static gboolean desc_get_uuid(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
struct descriptor *desc = user_data;
dbus_message_iter_append_basic(iter, DBUS_TYPE_STRING, &desc->uuid);
return TRUE;
}
static gboolean desc_get_characteristic(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
struct descriptor *desc = user_data;
dbus_message_iter_append_basic(iter, DBUS_TYPE_OBJECT_PATH,
&desc->chr->path);
return TRUE;
}
static bool desc_read(struct descriptor *desc, DBusMessageIter *iter)
{
DBusMessageIter array;
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_TYPE_BYTE_AS_STRING, &array);
if (desc->vlen && desc->value)
dbus_message_iter_append_fixed_array(&array, DBUS_TYPE_BYTE,
&desc->value, desc->vlen);
dbus_message_iter_close_container(iter, &array);
return true;
}
static gboolean desc_get_value(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
struct descriptor *desc = user_data;
printf("Descriptor(%s): Get(\"Value\")\n", desc->uuid);
return desc_read(desc, iter);
}
static void desc_write(struct descriptor *desc, const uint8_t *value, int len)
{
g_free(desc->value);
desc->value = g_memdup(value, len);
desc->vlen = len;
g_dbus_emit_property_changed(connection, desc->path,
GATT_DESCRIPTOR_IFACE, "Value");
}
static int parse_value(DBusMessageIter *iter, const uint8_t **value, int *len)
{
DBusMessageIter array;
if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_ARRAY)
return -EINVAL;
dbus_message_iter_recurse(iter, &array);
dbus_message_iter_get_fixed_array(&array, value, len);
return 0;
}
static void desc_set_value(const GDBusPropertyTable *property,
DBusMessageIter *iter,
GDBusPendingPropertySet id, void *user_data)
{
struct descriptor *desc = user_data;
const uint8_t *value;
int len;
printf("Descriptor(%s): Set(\"Value\", ...)\n", desc->uuid);
if (parse_value(iter, &value, &len)) {
printf("Invalid value for Set('Value'...)\n");
g_dbus_pending_property_error(id,
ERROR_INTERFACE ".InvalidArguments",
"Invalid arguments in method call");
return;
}
desc_write(desc, value, len);
g_dbus_pending_property_success(id);
}
static gboolean desc_get_props(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *data)
{
struct descriptor *desc = data;
DBusMessageIter array;
int i;
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_TYPE_STRING_AS_STRING, &array);
for (i = 0; desc->props[i]; i++)
dbus_message_iter_append_basic(&array,
DBUS_TYPE_STRING, &desc->props[i]);
dbus_message_iter_close_container(iter, &array);
return TRUE;
}
static const GDBusPropertyTable desc_properties[] = {
{ "UUID", "s", desc_get_uuid },
{ "Characteristic", "o", desc_get_characteristic },
{ "Value", "ay", desc_get_value, desc_set_value, NULL },
{ "Flags", "as", desc_get_props, NULL, NULL },
{ }
};
static gboolean chr_get_uuid(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
struct characteristic *chr = user_data;
dbus_message_iter_append_basic(iter, DBUS_TYPE_STRING, &chr->uuid);
return TRUE;
}
static gboolean chr_get_service(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
struct characteristic *chr = user_data;
dbus_message_iter_append_basic(iter, DBUS_TYPE_OBJECT_PATH,
&chr->service);
return TRUE;
}
static bool chr_read(struct characteristic *chr, DBusMessageIter *iter)
{
DBusMessageIter array;
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_TYPE_BYTE_AS_STRING, &array);
dbus_message_iter_append_fixed_array(&array, DBUS_TYPE_BYTE,
&chr->value, chr->vlen);
dbus_message_iter_close_container(iter, &array);
return true;
}
static gboolean chr_get_value(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
struct characteristic *chr = user_data;
printf("Characteristic(%s): Get(\"Value\")\n", chr->uuid);
return chr_read(chr, iter);
}
static gboolean chr_get_props(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *data)
{
struct characteristic *chr = data;
DBusMessageIter array;
int i;
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_TYPE_STRING_AS_STRING, &array);
for (i = 0; chr->props[i]; i++)
dbus_message_iter_append_basic(&array,
DBUS_TYPE_STRING, &chr->props[i]);
dbus_message_iter_close_container(iter, &array);
return TRUE;
}
static void chr_write(struct characteristic *chr, const uint8_t *value, int len)
{
g_free(chr->value);
chr->value = g_memdup(value, len);
chr->vlen = len;
g_dbus_emit_property_changed(connection, chr->path, GATT_CHR_IFACE,
"Value");
}
static void chr_set_value(const GDBusPropertyTable *property,
DBusMessageIter *iter,
GDBusPendingPropertySet id, void *user_data)
{
struct characteristic *chr = user_data;
const uint8_t *value;
int len;
printf("Characteristic(%s): Set('Value', ...)\n", chr->uuid);
if (!parse_value(iter, &value, &len)) {
printf("Invalid value for Set('Value'...)\n");
g_dbus_pending_property_error(id,
ERROR_INTERFACE ".InvalidArguments",
"Invalid arguments in method call");
return;
}
chr_write(chr, value, len);
g_dbus_pending_property_success(id);
}
static const GDBusPropertyTable chr_properties[] = {
{ "UUID", "s", chr_get_uuid },
{ "Service", "o", chr_get_service },
{ "Value", "ay", chr_get_value, chr_set_value, NULL },
{ "Flags", "as", chr_get_props, NULL, NULL },
{ }
};
static gboolean service_get_primary(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
dbus_bool_t primary = TRUE;
printf("Get Primary: %s\n", primary ? "True" : "False");
dbus_message_iter_append_basic(iter, DBUS_TYPE_BOOLEAN, &primary);
return TRUE;
}
static gboolean service_get_uuid(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
const char *uuid = user_data;
printf("Get UUID: %s\n", uuid);
dbus_message_iter_append_basic(iter, DBUS_TYPE_STRING, &uuid);
return TRUE;
}
static gboolean service_get_includes(const GDBusPropertyTable *property,
DBusMessageIter *iter, void *user_data)
{
const char *uuid = user_data;
char service_path[100] = {0,};
DBusMessageIter array;
char *p = NULL;
snprintf(service_path, 100, "/service3");
printf("Get Includes: %s\n", uuid);
p = service_path;
printf("Includes path: %s\n", p);
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY,
DBUS_TYPE_OBJECT_PATH_AS_STRING, &array);
dbus_message_iter_append_basic(&array, DBUS_TYPE_OBJECT_PATH,
&p);
snprintf(service_path, 100, "/service2");
p = service_path;
printf("Get Includes: %s\n", p);
dbus_message_iter_append_basic(&array, DBUS_TYPE_OBJECT_PATH,
&p);
dbus_message_iter_close_container(iter, &array);
return TRUE;
}
static gboolean service_exist_includes(const GDBusPropertyTable *property,
void *user_data)
{
const char *uuid = user_data;
printf("Exist Includes: %s\n", uuid);
if (strncmp(uuid, "00001802", 8) == 0)
return TRUE;
return FALSE;
}
static const GDBusPropertyTable service_properties[] = {
{ "Primary", "b", service_get_primary },
{ "UUID", "s", service_get_uuid },
{ "Includes", "ao", service_get_includes, NULL,
service_exist_includes },
{ }
};
static void chr_iface_destroy(gpointer user_data)
{
struct characteristic *chr = user_data;
g_free(chr->uuid);
g_free(chr->service);
g_free(chr->value);
g_free(chr->path);
g_free(chr);
}
static void desc_iface_destroy(gpointer user_data)
{
struct descriptor *desc = user_data;
g_free(desc->uuid);
g_free(desc->value);
g_free(desc->path);
g_free(desc);
}
static int parse_options(DBusMessageIter *iter, const char **device)
{
DBusMessageIter dict;
if (dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_ARRAY)
return -EINVAL;
dbus_message_iter_recurse(iter, &dict);
while (dbus_message_iter_get_arg_type(&dict) == DBUS_TYPE_DICT_ENTRY) {
const char *key;
DBusMessageIter value, entry;
int var;
dbus_message_iter_recurse(&dict, &entry);
dbus_message_iter_get_basic(&entry, &key);
dbus_message_iter_next(&entry);
dbus_message_iter_recurse(&entry, &value);
var = dbus_message_iter_get_arg_type(&value);
if (strcasecmp(key, "device") == 0) {
if (var != DBUS_TYPE_OBJECT_PATH)
return -EINVAL;
dbus_message_iter_get_basic(&value, device);
printf("Device: %s\n", *device);
}
dbus_message_iter_next(&dict);
}
return 0;
}
static DBusMessage *chr_read_value(DBusConnection *conn, DBusMessage *msg,
void *user_data)
{
struct characteristic *chr = user_data;
DBusMessage *reply;
DBusMessageIter iter;
const char *device;
if (!dbus_message_iter_init(msg, &iter))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
if (parse_options(&iter, &device))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
reply = dbus_message_new_method_return(msg);
if (!reply)
return g_dbus_create_error(msg, DBUS_ERROR_NO_MEMORY,
"No Memory");
dbus_message_iter_init_append(reply, &iter);
chr_read(chr, &iter);
return reply;
}
static DBusMessage *chr_write_value(DBusConnection *conn, DBusMessage *msg,
void *user_data)
{
struct characteristic *chr = user_data;
DBusMessageIter iter;
const uint8_t *value;
int len;
const char *device;
dbus_message_iter_init(msg, &iter);
if (parse_value(&iter, &value, &len))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
if (parse_options(&iter, &device))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
chr_write(chr, value, len);
return dbus_message_new_method_return(msg);
}
static DBusMessage *chr_start_notify(DBusConnection *conn, DBusMessage *msg,
void *user_data)
{
return g_dbus_create_error(msg, DBUS_ERROR_NOT_SUPPORTED,
"Not Supported");
}
static DBusMessage *chr_stop_notify(DBusConnection *conn, DBusMessage *msg,
void *user_data)
{
return g_dbus_create_error(msg, DBUS_ERROR_NOT_SUPPORTED,
"Not Supported");
}
static const GDBusMethodTable chr_methods[] = {
{ GDBUS_ASYNC_METHOD("ReadValue", GDBUS_ARGS({ "options", "a{sv}" }),
GDBUS_ARGS({ "value", "ay" }),
chr_read_value) },
{ GDBUS_ASYNC_METHOD("WriteValue", GDBUS_ARGS({ "value", "ay" },
{ "options", "a{sv}" }),
NULL, chr_write_value) },
{ GDBUS_ASYNC_METHOD("StartNotify", NULL, NULL, chr_start_notify) },
{ GDBUS_METHOD("StopNotify", NULL, NULL, chr_stop_notify) },
{ }
};
static DBusMessage *desc_read_value(DBusConnection *conn, DBusMessage *msg,
void *user_data)
{
struct descriptor *desc = user_data;
DBusMessage *reply;
DBusMessageIter iter;
const char *device;
if (!dbus_message_iter_init(msg, &iter))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
if (parse_options(&iter, &device))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
reply = dbus_message_new_method_return(msg);
if (!reply)
return g_dbus_create_error(msg, DBUS_ERROR_NO_MEMORY,
"No Memory");
dbus_message_iter_init_append(reply, &iter);
desc_read(desc, &iter);
return reply;
}
static DBusMessage *desc_write_value(DBusConnection *conn, DBusMessage *msg,
void *user_data)
{
struct descriptor *desc = user_data;
DBusMessageIter iter;
const char *device;
const uint8_t *value;
int len;
if (!dbus_message_iter_init(msg, &iter))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
if (parse_value(&iter, &value, &len))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
if (parse_options(&iter, &device))
return g_dbus_create_error(msg, DBUS_ERROR_INVALID_ARGS,
"Invalid arguments");
desc_write(desc, value, len);
return dbus_message_new_method_return(msg);
}
static const GDBusMethodTable desc_methods[] = {
{ GDBUS_ASYNC_METHOD("ReadValue", GDBUS_ARGS({ "options", "a{sv}" }),
GDBUS_ARGS({ "value", "ay" }),
desc_read_value) },
{ GDBUS_ASYNC_METHOD("WriteValue", GDBUS_ARGS({ "value", "ay" },
{ "options", "a{sv}" }),
NULL, desc_write_value) },
{ }
};
static gboolean register_characteristic(const char *chr_uuid,
const uint8_t *value, int vlen,
const char **props,
const char *desc_uuid,
const char **desc_props,
const char *service_path)
{
struct characteristic *chr;
struct descriptor *desc;
static int id = 1;
chr = g_new0(struct characteristic, 1);
chr->uuid = g_strdup(chr_uuid);
chr->value = g_memdup(value, vlen);
chr->vlen = vlen;
chr->props = props;
chr->service = g_strdup(service_path);
chr->path = g_strdup_printf("%s/characteristic%d", service_path, id++);
if (!g_dbus_register_interface(connection, chr->path, GATT_CHR_IFACE,
chr_methods, NULL, chr_properties,
chr, chr_iface_destroy)) {
printf("Couldn't register characteristic interface\n");
chr_iface_destroy(chr);
return FALSE;
}
if (!desc_uuid)
return TRUE;
desc = g_new0(struct descriptor, 1);
desc->uuid = g_strdup(desc_uuid);
desc->chr = chr;
desc->props = desc_props;
desc->path = g_strdup_printf("%s/descriptor%d", chr->path, id++);
if (!g_dbus_register_interface(connection, desc->path,
GATT_DESCRIPTOR_IFACE,
desc_methods, NULL, desc_properties,
desc, desc_iface_destroy)) {
printf("Couldn't register descriptor interface\n");
g_dbus_unregister_interface(connection, chr->path,
GATT_CHR_IFACE);
desc_iface_destroy(desc);
return FALSE;
}
return TRUE;
}
static char *register_service(const char *uuid)
{
static int id = 1;
char *path;
path = g_strdup_printf("/service%d", id++);
if (!g_dbus_register_interface(connection, path, GATT_SERVICE_IFACE,
NULL, NULL, service_properties,
g_strdup(uuid), g_free)) {
printf("Couldn't register service interface\n");
g_free(path);
return NULL;
}
return path;
}
static void create_services_one(void)
{
char *service_path;
uint8_t level = 0;
service_path = register_service(IAS_UUID);
if (!service_path)
return;
/* Add Alert Level Characteristic to Immediate Alert Service */
if (!register_characteristic(ALERT_LEVEL_CHR_UUID,
&level, sizeof(level),
ias_alert_level_props,
READ_WRITE_DESCRIPTOR_UUID,
desc_props,
service_path)) {
printf("Couldn't register Alert Level characteristic (IAS)\n");
g_dbus_unregister_interface(connection, service_path,
GATT_SERVICE_IFACE);
g_free(service_path);
return;
}
services = g_slist_prepend(services, service_path);
printf("Registered service: %s\n", service_path);
}
static void create_services_two(void)
{
char *service_path;
uint8_t level = 0;
service_path = register_service(IAS_UUID2);
if (!service_path)
return;
if (!register_characteristic(ALERT_LEVEL_CHR_UUID2,
&level, sizeof(level),
ias_alert_level_props,
READ_WRITE_DESCRIPTOR_UUID2,
desc_props,
service_path)) {
printf("Couldn't register Alert Level characteristic (IAS)\n");
g_dbus_unregister_interface(connection, service_path,
GATT_SERVICE_IFACE);
g_free(service_path);
return;
}
services = g_slist_prepend(services, service_path);
printf("Registered service: %s\n", service_path);
}
static void create_services_three(void)
{
char *service_path;
uint8_t level = 0;
service_path = register_service(IAS_UUID3);
if (!service_path)
return;
if (!register_characteristic(ALERT_LEVEL_CHR_UUID1,
&level, sizeof(level),
ias_alert_level_props,
READ_WRITE_DESCRIPTOR_UUID1,
desc_props,
service_path)) {
printf("Couldn't register Alert Level characteristic (IAS)\n");
g_dbus_unregister_interface(connection, service_path,
GATT_SERVICE_IFACE);
g_free(service_path);
return;
}
services = g_slist_prepend(services, service_path);
printf("Registered service: %s\n", service_path);
}
static void register_app_reply(DBusMessage *reply, void *user_data)
{
DBusError derr;
dbus_error_init(&derr);
dbus_set_error_from_message(&derr, reply);
if (dbus_error_is_set(&derr))
printf("RegisterApplication: %s\n", derr.message);
else
printf("RegisterApplication: OK\n");
dbus_error_free(&derr);
}
static void register_app_setup(DBusMessageIter *iter, void *user_data)
{
const char *path = "/";
DBusMessageIter dict;
dbus_message_iter_append_basic(iter, DBUS_TYPE_OBJECT_PATH, &path);
dbus_message_iter_open_container(iter, DBUS_TYPE_ARRAY, "{sv}", &dict);
/* TODO: Add options dictionary */
dbus_message_iter_close_container(iter, &dict);
}
static void register_app(GDBusProxy *proxy)
{
if (!g_dbus_proxy_method_call(proxy, "RegisterApplication",
register_app_setup, register_app_reply,
NULL, NULL)) {
printf("Unable to call RegisterApplication\n");
return;
}
}
static void proxy_added_cb(GDBusProxy *proxy, void *user_data)
{
const char *iface;
iface = g_dbus_proxy_get_interface(proxy);
if (g_strcmp0(iface, GATT_MGR_IFACE))
return;
register_app(proxy);
}
static gboolean signal_handler(GIOChannel *channel, GIOCondition cond,
gpointer user_data)
{
static bool __terminated = false;
struct signalfd_siginfo si;
ssize_t result;
int fd;
if (cond & (G_IO_NVAL | G_IO_ERR | G_IO_HUP))
return FALSE;
fd = g_io_channel_unix_get_fd(channel);
result = read(fd, &si, sizeof(si));
if (result != sizeof(si))
return FALSE;
switch (si.ssi_signo) {
case SIGINT:
case SIGTERM:
if (!__terminated) {
printf("Terminating\n");
g_main_loop_quit(main_loop);
}
__terminated = true;
break;
}
return TRUE;
}
static guint setup_signalfd(void)
{
GIOChannel *channel;
guint source;
sigset_t mask;
int fd;
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0) {
perror("Failed to set signal mask");
return 0;
}
fd = signalfd(-1, &mask, 0);
if (fd < 0) {
perror("Failed to create signal descriptor");
return 0;
}
channel = g_io_channel_unix_new(fd);
g_io_channel_set_close_on_unref(channel, TRUE);
g_io_channel_set_encoding(channel, NULL, NULL);
g_io_channel_set_buffered(channel, FALSE);
source = g_io_add_watch(channel,
G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
signal_handler, NULL);
g_io_channel_unref(channel);
return source;
}
int main(int argc, char *argv[])
{
GDBusClient *client;
guint signal;
signal = setup_signalfd();
if (signal == 0)
return -errno;
connection = g_dbus_setup_bus(DBUS_BUS_SYSTEM, NULL, NULL);
main_loop = g_main_loop_new(NULL, FALSE);
g_dbus_attach_object_manager(connection);
printf("gatt-service unique name: %s\n",
dbus_bus_get_unique_name(connection));
create_services_one();
create_services_two();
create_services_three();
client = g_dbus_client_new(connection, "org.bluez", "/");
g_dbus_client_set_proxy_handlers(client, proxy_added_cb, NULL, NULL,
NULL);
g_main_loop_run(main_loop);
g_dbus_client_unref(client);
g_source_remove(signal);
g_slist_free_full(services, g_free);
dbus_connection_unref(connection);
return 0;
}