usb_moded-dbus.c 33.4 KB
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/**
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 * @file        usb_moded-dbus.c
 *
 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
 * Copyright (C) 2012-2018 Jolla. All rights reserved.
 *
 * @author: Philippe De Swert <philippe.de-swert@nokia.com>
 * @author: Philippe De Swert <phdeswer@lumi.maa>
 * @author: Philippe De Swert <philippedeswert@gmail.com>
 * @author: Philippe De Swert <philippe.deswert@jollamobile.com>
 * @author: Vesa Halttunen <vesa.halttunen@jollamobile.com>
 * @author: Slava Monich <slava.monich@jolla.com>
 * @author: Martin Jones <martin.jones@jollamobile.com>
 * @author: Simo Piiroinen <simo.piiroinen@jollamobile.com>
 * @author: Andrew den Exter <andrew.den.exter@jolla.com>
 * @author: Andrew den Exter <andrew.den.exter@jollamobile.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the Lesser GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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 Lesser 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
 */
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#include "usb_moded-dbus-private.h"
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#include "usb_moded-config-private.h"
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#include "usb_moded-control.h"
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#include "usb_moded-log.h"
#include "usb_moded-modes.h"
#include "usb_moded-network.h"

#include <stdlib.h>
#include <string.h>

#include <dbus/dbus-glib-lowlevel.h>
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/* ========================================================================= *
 * Constants
 * ========================================================================= */

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#define INIT_DONE_INTERFACE "com.nokia.startup.signal"
#define INIT_DONE_SIGNAL    "init_done"
#define INIT_DONE_MATCH     "type='signal',interface='"INIT_DONE_INTERFACE"',member='"INIT_DONE_SIGNAL"'"

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/* ========================================================================= *
 * Prototypes
 * ========================================================================= */

/* -- umdbus -- */

static void               umdbus_send_config_signal           (const char *section, const char *key, const char *value);
static DBusHandlerResult  umdbus_msg_handler                  (DBusConnection *const connection, DBusMessage *const msg, gpointer const user_data);
DBusConnection           *umdbus_get_connection               (void);
gboolean                  umdbus_init_connection              (void);
gboolean                  umdbus_init_service                 (void);
static void               umdbus_cleanup_service              (void);
void                      umdbus_cleanup                      (void);
static int                umdbus_send_signal_ex               (const char *signal_type, const char *content);
int                       umdbus_send_state_signal            (const char *state_ind);
int                       umdbus_send_error_signal            (const char *error);
int                       umdbus_send_supported_modes_signal  (const char *supported_modes);
int                       umdbus_send_available_modes_signal  (const char *available_modes);
int                       umdbus_send_hidden_modes_signal     (const char *hidden_modes);
int                       umdbus_send_whitelisted_modes_signal(const char *whitelist);
static void               umdbus_get_name_owner_cb            (DBusPendingCall *pc, void *aptr);
gboolean                  umdbus_get_name_owner_async         (const char *name, usb_moded_get_name_owner_fn cb, DBusPendingCall **ppc);

/* ========================================================================= *
 * Data
 * ========================================================================= */

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static DBusConnection *dbus_connection_sys = NULL;
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static gboolean        have_service_name   = FALSE;

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/** Introspect xml format string for parents of USB_MODE_OBJECT */
static const char intospect_template[] =
"<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\" \"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
"<node name=\"%s\">\n"
"  <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
"    <method name=\"Introspect\">\n"
"      <arg direction=\"out\" name=\"data\" type=\"s\"/>\n"
"    </method>\n"
"  </interface>\n"
"  <interface name=\"org.freedesktop.DBus.Peer\">\n"
"    <method name=\"Ping\"/>\n"
"    <method name=\"GetMachineId\">\n"
"      <arg direction=\"out\" name=\"machine_uuid\" type=\"s\" />\n"
"    </method>\n"
"  </interface>\n"
"  <node name=\"%s\"/>\n"
"</node>\n";

/** Introspect xml data for object path USB_MODE_OBJECT */
static const char introspect_usb_moded[] =
"<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\" "
"\"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
"<node name=\"" USB_MODE_OBJECT "\">\n"
"  <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
"    <method name=\"Introspect\">\n"
"      <arg name=\"xml\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
"  </interface>\n"
"  <interface name=\"org.freedesktop.DBus.Peer\">\n"
"    <method name=\"Ping\"/>\n"
"    <method name=\"GetMachineId\">\n"
"      <arg direction=\"out\" name=\"machine_uuid\" type=\"s\" />\n"
"    </method>\n"
"  </interface>\n"
"  <interface name=\"" USB_MODE_INTERFACE "\">\n"
"    <method name=\"" USB_MODE_STATE_REQUEST "\">\n"
"      <arg name=\"mode\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
"    <method name=\"" USB_MODE_STATE_SET "\">\n"
"      <arg name=\"mode\" type=\"s\" direction=\"in\"/>\n"
"      <arg name=\"mode\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
"    <method name=\"" USB_MODE_CONFIG_SET "\">\n"
"      <arg name=\"config\" type=\"s\" direction=\"in\"/>\n"
"      <arg name=\"config\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
"    <method name=\"" USB_MODE_NETWORK_SET "\">\n"
"      <arg name=\"key\" type=\"s\" direction=\"in\"/>\n"
"      <arg name=\"value\" type=\"s\" direction=\"in\"/>\n"
"      <arg name=\"key\" type=\"s\" direction=\"out\"/>\n"
"      <arg name=\"value\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
"    <method name=\"" USB_MODE_NETWORK_GET "\">\n"
"      <arg name=\"key\" type=\"s\" direction=\"in\"/>\n"
"      <arg name=\"key\" type=\"s\" direction=\"out\"/>\n"
"      <arg name=\"value\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
"    <method name=\"" USB_MODE_CONFIG_GET "\">\n"
"      <arg name=\"mode\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
"    <method name=\"" USB_MODE_LIST "\">\n"
"      <arg name=\"modes\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
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"    <method name=\"" USB_MODE_AVAILABLE_MODES_GET "\">\n"
"      <arg name=\"modes\" type=\"s\" direction=\"out\"/>\n"
"    </method>\n"
"    <method name=\"" USB_MODE_WHITELISTED_MODES_GET "\">\n"
"      <arg name=\"modes\" type=\"s\" direction=\"out\"/>\n"
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"    </method>\n"
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"    <method name=\"" USB_MODE_WHITELISTED_MODES_SET "\">"
"      <arg name=\"modes\" type=\"s\" direction=\"in\"/>"
"    </method>"
"    <method name=\"" USB_MODE_WHITELISTED_SET "\">"
"      <arg name=\"mode\" type=\"s\" direction=\"in\"/>"
"      <arg name=\"whitelisted\" type=\"b\" direction=\"in\"/>"
"     </method>"
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"    <method name=\"" USB_MODE_RESCUE_OFF "\"/>\n"
"    <signal name=\"" USB_MODE_SIGNAL_NAME "\">\n"
"      <arg name=\"mode\" type=\"s\"/>\n"
"    </signal>\n"
"    <signal name=\"" USB_MODE_ERROR_SIGNAL_NAME "\">\n"
"      <arg name=\"error\" type=\"s\"/>\n"
"    </signal>\n"
"    <signal name=\"" USB_MODE_SUPPORTED_MODES_SIGNAL_NAME "\">\n"
"      <arg name=\"modes\" type=\"s\"/>\n"
"    </signal>\n"
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"    <signal name=\"" USB_MODE_AVAILABLE_MODES_SIGNAL_NAME "\">\n"
"      <arg name=\"modes\" type=\"s\">\n"
"    </signal>\n"
"    <signal name=\"" USB_MODE_WHITELISTED_MODES_SIGNAL_NAME "\">\n"
"      <arg name=\"modes\" type=\"s\">\n"
"    </signal>\n"
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"    <signal name=\"" USB_MODE_CONFIG_SIGNAL_NAME "\">\n"
"      <arg name=\"section\" type=\"s\"/>\n"
"      <arg name=\"key\" type=\"s\"/>\n"
"      <arg name=\"value\" type=\"s\"/>\n"
"    </signal>\n"
"  </interface>\n"
"</node>\n";

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/* ========================================================================= *
 * Functions
 * ========================================================================= */

/**
 * Issues "sig_usb_config_ind" signal.
*/
static void umdbus_send_config_signal(const char *section, const char *key, const char *value)
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{
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    log_debug("broadcast signal %s(%s, %s, %s)\n", USB_MODE_CONFIG_SIGNAL_NAME, section, key, value);

    if( !have_service_name )
    {
        log_err("config notification without service: [%s] %s=%s",
                section, key, value);
    }
    else if (dbus_connection_sys)
    {
        DBusMessage* msg = dbus_message_new_signal(USB_MODE_OBJECT, USB_MODE_INTERFACE, USB_MODE_CONFIG_SIGNAL_NAME);
        if (msg) {
            dbus_message_append_args(msg, DBUS_TYPE_STRING, &section,
                                     DBUS_TYPE_STRING, &key,
                                     DBUS_TYPE_STRING, &value,
                                     DBUS_TYPE_INVALID);
            dbus_connection_send(dbus_connection_sys, msg, NULL);
            dbus_message_unref(msg);
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        }
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    }
}

static DBusHandlerResult umdbus_msg_handler(DBusConnection *const connection, DBusMessage *const msg, gpointer const user_data)
{
    DBusHandlerResult   status    = DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
    DBusMessage        *reply     = 0;
    const char         *interface = dbus_message_get_interface(msg);
    const char         *member    = dbus_message_get_member(msg);
    const char         *object    = dbus_message_get_path(msg);
    int                 type      = dbus_message_get_type(msg);

    (void)user_data;

    if(!interface || !member || !object) goto EXIT;

    log_debug("DBUS %s %s.%s from %s",
              dbus_message_type_to_string(type),
              interface, member,
              dbus_message_get_sender(msg) ?: "N/A");

    if( type == DBUS_MESSAGE_TYPE_SIGNAL )
    {
        if( !strcmp(interface, INIT_DONE_INTERFACE) && !strcmp(member, INIT_DONE_SIGNAL) ) {
            /* Update the cached state value */
            usbmoded_set_init_done(true);

            /* Auto-disable rescue mode when bootup is finished */
            if( usbmoded_rescue_mode ) {
                usbmoded_rescue_mode = FALSE;
                log_debug("init done reached - rescue mode disabled");
            }
        }
        goto EXIT;
    }

    if( type == DBUS_MESSAGE_TYPE_METHOD_CALL && !strcmp(interface, USB_MODE_INTERFACE) && !strcmp(object, USB_MODE_OBJECT))
    {
        status = DBUS_HANDLER_RESULT_HANDLED;

        if(!strcmp(member, USB_MODE_STATE_REQUEST))
        {
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            const char *mode = control_get_external_mode();
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            /* To the outside we want to keep CHARGING and CHARGING_FALLBACK the same */
            if(!strcmp(MODE_CHARGING_FALLBACK, mode))
                mode = MODE_CHARGING;
            if((reply = dbus_message_new_method_return(msg)))
                dbus_message_append_args (reply, DBUS_TYPE_STRING, &mode, DBUS_TYPE_INVALID);
        }
        else if(!strcmp(member, USB_MODE_STATE_SET))
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        {
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            char *use = 0;
            DBusError   err = DBUS_ERROR_INIT;

            if(!dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &use, DBUS_TYPE_INVALID))
                reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            else
            {
                /* check if usb is connected, since it makes no sense to change mode if it isn't */
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                if( control_get_cable_state() != CABLE_STATE_PC_CONNECTED ) {
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                    log_warning("USB not connected, not changing mode!\n");
                    goto error_reply;
                }
                /* check if the mode exists */
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                if(common_valid_mode(use))
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                    goto error_reply;
                /* do not change mode if the mode requested is the one already set */
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                if(strcmp(use, control_get_usb_mode()) != 0)
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                {
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                    control_set_usb_mode(use);
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                }
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                if((reply = dbus_message_new_method_return(msg)))
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                    dbus_message_append_args (reply, DBUS_TYPE_STRING, &use, DBUS_TYPE_INVALID);
                else
                    error_reply:
                    reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            }
            dbus_error_free(&err);
        }
        else if(!strcmp(member, USB_MODE_CONFIG_SET))
        {
            char *config = 0;
            DBusError   err = DBUS_ERROR_INIT;

            if(!dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID))
                reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            else
            {
                /* error checking is done when setting configuration */
                int ret = config_set_mode_setting(config);
                if (ret == SET_CONFIG_UPDATED)
                    umdbus_send_config_signal(MODE_SETTING_ENTRY, MODE_SETTING_KEY, config);
                if (SET_CONFIG_OK(ret))
                {
                    if((reply = dbus_message_new_method_return(msg)))
                        dbus_message_append_args (reply, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID);
                }
                else
                    reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, config);
            }
            dbus_error_free(&err);
        }
        else if(!strcmp(member, USB_MODE_HIDE))
        {
            char *config = 0;
            DBusError   err = DBUS_ERROR_INIT;

            if(!dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID))
                reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            else
            {
                /* error checking is done when setting configuration */
                int ret = config_set_hide_mode_setting(config);
                if (ret == SET_CONFIG_UPDATED)
                    umdbus_send_config_signal(MODE_SETTING_ENTRY, MODE_HIDE_KEY, config);
                if (SET_CONFIG_OK(ret))
                {
                    if((reply = dbus_message_new_method_return(msg)))
                        dbus_message_append_args (reply, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID);
                }
                else
                    reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, config);
            }
            dbus_error_free(&err);
        }
        else if(!strcmp(member, USB_MODE_UNHIDE))
        {
            char *config = 0;
            DBusError   err = DBUS_ERROR_INIT;

            if(!dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID))
                reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            else
            {
                /* error checking is done when setting configuration */
                int ret = config_set_unhide_mode_setting(config);
                if (ret == SET_CONFIG_UPDATED)
                    umdbus_send_config_signal(MODE_SETTING_ENTRY, MODE_HIDE_KEY, config);
                if (SET_CONFIG_OK(ret))
                {
                    if((reply = dbus_message_new_method_return(msg)))
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                        dbus_message_append_args (reply, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID);
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                }
                else
                    reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, config);
            }
            dbus_error_free(&err);
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        }
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        else if(!strcmp(member, USB_MODE_HIDDEN_GET))
        {
            char *config = config_get_hidden_modes();
            if(!config)
                config = g_strdup("");
            if((reply = dbus_message_new_method_return(msg)))
                dbus_message_append_args (reply, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID);
            g_free(config);
        }
        else if(!strcmp(member, USB_MODE_NETWORK_SET))
        {
            char *config = 0, *setting = 0;
            DBusError   err = DBUS_ERROR_INIT;

            if(!dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &config, DBUS_TYPE_STRING, &setting, DBUS_TYPE_INVALID))
                reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            else
            {
                /* error checking is done when setting configuration */
                int ret = config_set_network_setting(config, setting);
                if (ret == SET_CONFIG_UPDATED)
                    umdbus_send_config_signal(NETWORK_ENTRY, config, setting);
                if (SET_CONFIG_OK(ret))
                {
                    if((reply = dbus_message_new_method_return(msg)))
                        dbus_message_append_args (reply, DBUS_TYPE_STRING, &config, DBUS_TYPE_STRING, &setting, DBUS_TYPE_INVALID);
                    network_update();
                }
                else
                    reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, config);
            }
            dbus_error_free(&err);
        }
        else if(!strcmp(member, USB_MODE_NETWORK_GET))
        {
            char *config = 0;
            char *setting = 0;
            DBusError   err = DBUS_ERROR_INIT;

            if(!dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID))
            {
                reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            }
            else
            {
                setting = config_get_network_setting(config);
                if(setting)
                {
                    if((reply = dbus_message_new_method_return(msg)))
                        dbus_message_append_args (reply, DBUS_TYPE_STRING, &config, DBUS_TYPE_STRING, &setting, DBUS_TYPE_INVALID);
                    free(setting);
                }
                else
                    reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, config);
            }
        }
        else if(!strcmp(member, USB_MODE_CONFIG_GET))
        {
            char *config = config_get_mode_setting();

            if(!config)
            {
                /* Config is corrupted or we do not have a mode
                 * configured, fallback to undefined. */
                config = g_strdup(MODE_UNDEFINED);
            }

            if((reply = dbus_message_new_method_return(msg)))
                dbus_message_append_args (reply, DBUS_TYPE_STRING, &config, DBUS_TYPE_INVALID);
            g_free(config);
        }
        else if(!strcmp(member, USB_MODE_LIST))
        {
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            gchar *mode_list = common_get_mode_list(SUPPORTED_MODES_LIST);
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            if((reply = dbus_message_new_method_return(msg)))
                dbus_message_append_args (reply, DBUS_TYPE_STRING, (const char *) &mode_list, DBUS_TYPE_INVALID);
            g_free(mode_list);
        }
        else if(!strcmp(member, USB_MODE_AVAILABLE_MODES_GET))
        {
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            gchar *mode_list = common_get_mode_list(AVAILABLE_MODES_LIST);
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            if((reply = dbus_message_new_method_return(msg)))
                dbus_message_append_args (reply, DBUS_TYPE_STRING, (const char *) &mode_list, DBUS_TYPE_INVALID);
            g_free(mode_list);
        }
        else if(!strcmp(member, USB_MODE_RESCUE_OFF))
        {
            usbmoded_rescue_mode = FALSE;
            log_debug("Rescue mode off\n ");
            reply = dbus_message_new_method_return(msg);
        }
        else if(!strcmp(member, USB_MODE_WHITELISTED_MODES_GET))
        {
            gchar *mode_list = config_get_mode_whitelist();

            if(!mode_list)
                mode_list = g_strdup("");

            if((reply = dbus_message_new_method_return(msg)))
                dbus_message_append_args(reply, DBUS_TYPE_STRING, &mode_list, DBUS_TYPE_INVALID);
            g_free(mode_list);
        }
        else if(!strcmp(member, USB_MODE_WHITELISTED_MODES_SET))
        {
            const char *whitelist = 0;
            DBusError err = DBUS_ERROR_INIT;

            if (!dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &whitelist, DBUS_TYPE_INVALID))
                reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            else
            {
                int ret = config_set_mode_whitelist(whitelist);
                if (ret == SET_CONFIG_UPDATED)
                    umdbus_send_config_signal(MODE_SETTING_ENTRY, MODE_WHITELIST_KEY, whitelist);
                if (SET_CONFIG_OK(ret))
                {
                    if ((reply = dbus_message_new_method_return(msg)))
                        dbus_message_append_args(reply, DBUS_TYPE_STRING, &whitelist, DBUS_TYPE_INVALID);
                }
                else
                    reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, whitelist);
            }
            dbus_error_free(&err);
        }
        else if (!strcmp(member, USB_MODE_WHITELISTED_SET))
        {
            const char *mode = 0;
            dbus_bool_t enabled = FALSE;
            DBusError err = DBUS_ERROR_INIT;

            if (!dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &mode, DBUS_TYPE_BOOLEAN, &enabled, DBUS_TYPE_INVALID))
                reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, member);
            else
            {
                int ret = config_set_mode_in_whitelist(mode, enabled);
                if (ret == SET_CONFIG_UPDATED)
                {
                    char *whitelist = config_get_mode_whitelist();
                    if (!whitelist)
                        whitelist = g_strdup(MODE_UNDEFINED);
                    umdbus_send_config_signal(MODE_SETTING_ENTRY, MODE_WHITELIST_KEY, whitelist);
                    g_free(whitelist);
                }
                if (SET_CONFIG_OK(ret))
                    reply = dbus_message_new_method_return(msg);
                else
                    reply = dbus_message_new_error(msg, DBUS_ERROR_INVALID_ARGS, mode);
            }
            dbus_error_free(&err);
        }
        else
        {
            /*unknown methods are handled here */
            reply = dbus_message_new_error(msg, DBUS_ERROR_UNKNOWN_METHOD, member);
        }

        if( !reply )
        {
            reply = dbus_message_new_error(msg, DBUS_ERROR_FAILED, member);
        }
    }
    else if( type == DBUS_MESSAGE_TYPE_METHOD_CALL &&
             !strcmp(interface, "org.freedesktop.DBus.Introspectable") &&
             !strcmp(member, "Introspect"))
    {
        const gchar *xml = 0;
        gchar       *tmp = 0;
        gchar       *err = 0;
        size_t       len = strlen(object);
        const char  *pos = USB_MODE_OBJECT;

        if( !strncmp(object, pos, len) )
        {
            if( pos[len] == 0 )
            {
                /* Full length USB_MODE_OBJECT requested */
                xml = introspect_usb_moded;
            }
            else if( pos[len] == '/' )
            {
                /* Leading part of USB_MODE_OBJECT requested */
                gchar *parent = 0;
                gchar *child = 0;
                parent = g_strndup(pos, len);
                pos += len + 1;
                len = strcspn(pos, "/");
                child = g_strndup(pos, len);
                xml = tmp = g_strdup_printf(intospect_template,
                                            parent, child);
                g_free(child);
                g_free(parent);
            }
            else if( !strcmp(object, "/") )
            {
                /* Root object needs to be handled separately */
                const char *parent = "/";
                gchar *child = 0;
                pos += 1;
                len = strcspn(pos, "/");
                child = g_strndup(pos, len);
                xml = tmp = g_strdup_printf(intospect_template,
                                            parent, child);
                g_free(child);
            }
        }

        if( xml )
        {
            if((reply = dbus_message_new_method_return(msg)))
                dbus_message_append_args (reply,
                                          DBUS_TYPE_STRING, &xml,
                                          DBUS_TYPE_INVALID);
        }
        else
        {
            err = g_strdup_printf("Object '%s' does not exist", object);
            reply = dbus_message_new_error(msg, DBUS_ERROR_UNKNOWN_OBJECT,
                                           err);
        }

        g_free(err);
        g_free(tmp);

        if( reply )
        {
            status = DBUS_HANDLER_RESULT_HANDLED;
        }
    }
590 591 592

EXIT:

593 594 595 596 597 598 599 600 601 602 603
    if(reply)
    {
        if( !dbus_message_get_no_reply(msg) )
        {
            if( !dbus_connection_send(connection, reply, 0) )
                log_debug("Failed sending reply. Out Of Memory!\n");
        }
        dbus_message_unref(reply);
    }

    return status;
604 605
}

606
DBusConnection *umdbus_get_connection(void)
607 608 609
{
    DBusConnection *connection = 0;
    if( dbus_connection_sys )
610
        connection = dbus_connection_ref(dbus_connection_sys);
611
    else
612
        log_err("something asked for connection ref while unconnected");
613 614 615
    return connection;
}

616
/**
617
 * Establish D-Bus SystemBus connection
618 619 620
 *
 * @return TRUE when everything went ok
 */
621
gboolean umdbus_init_connection(void)
622
{
623 624
    gboolean status = FALSE;
    DBusError error = DBUS_ERROR_INIT;
625

626 627 628 629
    /* connect to system bus */
    if ((dbus_connection_sys = dbus_bus_get(DBUS_BUS_SYSTEM, &error)) == NULL)
    {
        log_debug("Failed to open connection to system message bus; %s\n",  error.message);
630
        goto EXIT;
631
    }
632

633 634 635
    /* Initialise message handlers */
    if (!dbus_connection_add_filter(dbus_connection_sys, umdbus_msg_handler, NULL, NULL))
        goto EXIT;
636

637 638
    /* Listen to init-done signals */
    dbus_bus_add_match(dbus_connection_sys, INIT_DONE_MATCH, 0);
639

640 641
    /* Re-check flag file after adding signal listener */
    usbmoded_probe_init_done();
642

643 644
    /* Connect D-Bus to the mainloop */
    dbus_connection_setup_with_g_main(dbus_connection_sys, NULL);
645

646 647
    /* everything went fine */
    status = TRUE;
648 649

EXIT:
650 651
    dbus_error_free(&error);
    return status;
652 653 654 655 656 657 658
}

/**
 * Reserve "com.meego.usb_moded" D-Bus Service Name
 *
 * @return TRUE when everything went ok
 */
659
gboolean umdbus_init_service(void)
660
{
661 662 663 664 665
    gboolean status = FALSE;
    DBusError error = DBUS_ERROR_INIT;
    int ret;

    if( !dbus_connection_sys ) {
666
        goto EXIT;
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681
    }

    /* Acquire D-Bus service */
    ret = dbus_bus_request_name(dbus_connection_sys, USB_MODE_SERVICE, DBUS_NAME_FLAG_DO_NOT_QUEUE, &error);
    if (ret != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER)
    {
        log_debug("failed claiming dbus name\n");
        if( dbus_error_is_set(&error) )
            log_debug("DBUS ERROR: %s, %s \n", error.name, error.message);
        goto EXIT;
    }
    log_debug("claimed name %s", USB_MODE_SERVICE);
    have_service_name = TRUE;
    /* everything went fine */
    status = TRUE;
682

683
EXIT:
684 685
    dbus_error_free(&error);
    return status;
686 687
}

688 689
/** Release "com.meego.usb_moded" D-Bus Service Name
 */
690
static void umdbus_cleanup_service(void)
691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707
{
    if( !have_service_name )
        goto EXIT;

    have_service_name = FALSE;
    log_debug("release name %s", USB_MODE_SERVICE);

    if( dbus_connection_sys &&
        dbus_connection_get_is_connected(dbus_connection_sys) )
    {
        dbus_bus_release_name(dbus_connection_sys, USB_MODE_SERVICE, NULL);
    }

EXIT:
    return;
}

708 709 710 711
/**
 * Clean up the dbus connections on exit
 *
 */
712
void umdbus_cleanup(void)
713
{
714 715 716
    /* clean up system bus connection */
    if (dbus_connection_sys != NULL)
    {
717
        umdbus_cleanup_service();
718

719
        dbus_connection_remove_filter(dbus_connection_sys, umdbus_msg_handler, NULL);
720

721 722
        dbus_connection_unref(dbus_connection_sys),
            dbus_connection_sys = NULL;
723
    }
724 725 726
}

/**
727
 * Helper function for sending the different signals
728
 *
729
 * @return 0 on success, 1 on failure
730 731
 * @param signal_type the type of signal (normal, error, ...)
 * @@param content string which can be mode name, error, list of modes, ...
732
*/
733
static int umdbus_send_signal_ex(const char *signal_type, const char *content)
734
{
735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
    int result = 1;
    DBusMessage* msg = 0;

    log_debug("broadcast signal %s(%s)\n", signal_type, content);

    if( !have_service_name )
    {
        log_err("sending signal without service: %s(%s)",
                signal_type, content);
        goto EXIT;
    }
    if(!dbus_connection_sys)
    {
        log_err("Dbus system connection broken!\n");
        goto EXIT;
    }
    // create a signal and check for errors
    msg = dbus_message_new_signal(USB_MODE_OBJECT, USB_MODE_INTERFACE, signal_type );
    if (NULL == msg)
    {
        log_debug("Message Null\n");
        goto EXIT;
    }

    // append arguments onto signal
    if (!dbus_message_append_args(msg, DBUS_TYPE_STRING, &content, DBUS_TYPE_INVALID))
    {
        log_debug("Appending arguments failed. Out Of Memory!\n");
        goto EXIT;
    }

    // send the message on the correct bus  and flush the connection
    if (!dbus_connection_send(dbus_connection_sys, msg, 0))
    {
        log_debug("Failed sending message. Out Of Memory!\n");
        goto EXIT;
    }
    result = 0;
773

774
EXIT:
775 776 777
    // free the message
    if(msg != 0)
        dbus_message_unref(msg);
778

779
    return result;
780 781
}

782 783 784
/**
 * Send regular usb_moded state signal
 *
785
 * @return 0 on success, 1 on failure
786 787 788
 * @param state_ind the signal name
 *
*/
789
int umdbus_send_state_signal(const char *state_ind)
790
{
791
    return(umdbus_send_signal_ex(USB_MODE_SIGNAL_NAME, state_ind));
792
}
793

794 795 796
/**
 * Send regular usb_moded error signal
 *
797
 * @return 0 on success, 1 on failure
798
 * @param error the error to be signalled
799 800
 *
*/
801
int umdbus_send_error_signal(const char *error)
802
{
803
    return(umdbus_send_signal_ex(USB_MODE_ERROR_SIGNAL_NAME, error));
804
}
805

806 807 808
/**
 * Send regular usb_moded mode list signal
 *
809
 * @return 0 on success, 1 on failure
810
 * @param supported_modes list of supported modes
811 812
 *
*/
813
int umdbus_send_supported_modes_signal(const char *supported_modes)
814
{
815
    return(umdbus_send_signal_ex(USB_MODE_SUPPORTED_MODES_SIGNAL_NAME, supported_modes));
816
}
817

818 819 820 821 822 823 824
/**
 * Send regular usb_moded mode list signal
 *
 * @return 0 on success, 1 on failure
 * @param available_modes list of available modes
 *
*/
825
int umdbus_send_available_modes_signal(const char *available_modes)
826
{
827
    return(umdbus_send_signal_ex(USB_MODE_AVAILABLE_MODES_SIGNAL_NAME, available_modes));
828 829
}

830 831 832 833 834 835 836
/**
 * Send regular usb_moded hidden mode list signal
 *
 * @return 0 on success, 1 on failure
 * @param hidden_modes list of supported modes
 *
*/
837
int umdbus_send_hidden_modes_signal(const char *hidden_modes)
838
{
839
    return(umdbus_send_signal_ex(USB_MODE_HIDDEN_MODES_SIGNAL_NAME, hidden_modes));
840
}
841

842 843 844 845 846 847
/**
 * Send regular usb_moded whitelisted mode list signal
 *
 * @return 0 on success, 1 on failure
 * @param whitelist list of allowed modes
 */
848
int umdbus_send_whitelisted_modes_signal(const char *whitelist)
849
{
850
    return(umdbus_send_signal_ex(USB_MODE_WHITELISTED_MODES_SIGNAL_NAME, whitelist));
851 852
}

853
/** Async reply handler for umdbus_get_name_owner_async()
854 855 856 857
 *
 * @param pc    Pending call object pointer
 * @param aptr  Notify function to call (as a void pointer)
 */
858
static void umdbus_get_name_owner_cb(DBusPendingCall *pc, void *aptr)
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882
{
    usb_moded_get_name_owner_fn cb = aptr;

    DBusMessage *rsp = 0;
    const char  *dta = 0;
    DBusError    err = DBUS_ERROR_INIT;

    if( !(rsp = dbus_pending_call_steal_reply(pc)) ) {
        log_err("did not get reply");
        goto EXIT;
    }

    if( dbus_set_error_from_message(&err, rsp) )
    {
        if( strcmp(err.name, DBUS_ERROR_NAME_HAS_NO_OWNER) )
            log_err("error reply: %s: %s", err.name, err.message);
        goto EXIT;
    }

    if( !dbus_message_get_args(rsp, &err,
                               DBUS_TYPE_STRING, &dta,
                               DBUS_TYPE_INVALID) )
    {
        if( strcmp(err.name, DBUS_ERROR_NAME_HAS_NO_OWNER) )
883
            log_err("parse error: %s: %s", err.name, err.message);
884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
        goto EXIT;
    }

EXIT:
    /* Allways call the notification function. Equate any error
     * situations with "service does not have an owner". */
    cb(dta ?: "");

    if( rsp ) dbus_message_unref(rsp);

    dbus_error_free(&err);
}

/** Helper function for making async dbus name owner queries
 *
 * @param name  D-Bus name to query
 * @param cb    Function to call when async reply is received
 * @param ppc   Where to store pending call object, or NULL
 *
 * @return TRUE if method call was sent, FALSE otherwise
 */
905
gboolean umdbus_get_name_owner_async(const char *name,
906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937
                                        usb_moded_get_name_owner_fn cb,
                                        DBusPendingCall **ppc)
{
    gboolean         ack = FALSE;
    DBusMessage     *req = 0;
    DBusPendingCall *pc  = 0;

    if(!dbus_connection_sys)
        goto EXIT;

    req = dbus_message_new_method_call(DBUS_INTERFACE_DBUS,
                                       DBUS_PATH_DBUS,
                                       DBUS_INTERFACE_DBUS,
                                       DBUS_GET_NAME_OWNER_REQ);
    if( !req ) {
        log_err("could not create method call message");
        goto EXIT;
    }

    if( !dbus_message_append_args(req,
                                  DBUS_TYPE_STRING, &name,
                                  DBUS_TYPE_INVALID) ) {
        log_err("could not add method call parameters");
        goto EXIT;
    }

    if( !dbus_connection_send_with_reply(dbus_connection_sys, req, &pc, -1) )
        goto EXIT;

    if( !pc )
        goto EXIT;

938
    if( !dbus_pending_call_set_notify(pc, umdbus_get_name_owner_cb, cb, 0) )
939 940 941 942 943 944 945 946 947 948 949 950 951 952
        goto EXIT;

    ack = TRUE;

    if( ppc )
        *ppc = pc, pc = 0;

EXIT:

    if( pc  ) dbus_pending_call_unref(pc);
    if( req ) dbus_message_unref(req);

    return ack;
}