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vlc/modules/services_discovery/udisks.c

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/*****************************************************************************
* udisks.c: file system services discovery module
*****************************************************************************
* Copyright © 2022 VLC authors, VideoLAN and VideoLabs
*
* Authors: Juliane de Sartiges <jill@videolabs.io>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdbit.h>
#include <vlc_common.h>
#include <vlc_arrays.h>
#include <vlc_threads.h>
#include <vlc_poll.h>
#include <vlc_plugin.h>
#include <vlc_modules.h>
#include <vlc_configuration.h>
#include <vlc_services_discovery.h>
#include <vlc_url.h>
#include <poll.h>
#include SDBUS_HEADER
#define DBUS_INTERFACE_UDISKS2 "org.freedesktop.UDisks2"
#define DBUS_INTERFACE_UDISKS2_BLOCKS DBUS_INTERFACE_UDISKS2".Block"
#define DBUS_INTERFACE_UDISKS2_DRIVE DBUS_INTERFACE_UDISKS2".Drive"
#define DBUS_INTERFACE_UDISKS2_FILESYSTEM DBUS_INTERFACE_UDISKS2".Filesystem"
#define DBUS_INTERFACE_UDISKS2_MANAGER DBUS_INTERFACE_UDISKS2".Manager"
#define DBUS_INTERFACE_UDISKS2_PARTITION DBUS_INTERFACE_UDISKS2".Partition"
#define DBUS_INTERFACE_UDISKS2_LOOP DBUS_INTERFACE_UDISKS2".Loop"
#define DBUS_PATH_UDISKS2 "/org/freedesktop/UDisks2"
#define DBUS_PATH_UDISKS2_DRIVES DBUS_PATH_UDISKS2"/drives"
#define DBUS_PATH_UDISKS2_BLOCK_DEV DBUS_PATH_UDISKS2"/block_devices"
#define DBUS_PATH_UDISKS2_MANAGER DBUS_PATH_UDISKS2"/Manager"
struct fs_properties_changed_param
{
services_discovery_t *sd;
char *object_path;
};
struct device_info
{
sd_bus_slot *slot;
input_item_t *item;
char *label;
uint64_t size;
bool removable;
struct fs_properties_changed_param *param;
};
struct discovery_sys
{
sd_bus *bus;
sd_bus_slot *interface_added_slot;
sd_bus_slot *interface_removed_slot;
vlc_thread_t thread;
vlc_dictionary_t entries;
};
static const char * const binary_prefixes[] = { N_("B"), N_("KiB"), N_("MiB"), N_("GiB"), N_("TiB") };
static void release_device_info(services_discovery_t *sd, struct device_info* info)
{
if(info->param)
{
free(info->param->object_path);
free(info->param);
}
if(info->slot)
sd_bus_slot_unref(info->slot);
free(info->label);
if(info->item)
{
services_discovery_RemoveItem(sd, info->item);
input_item_Release(info->item);
}
free(info);
}
static int human(uint64_t *i)
{
if (i == 0)
return 0;
unsigned exp = (stdc_bit_width(*i) - 1) / 10;
if (exp >= ARRAY_SIZE(binary_prefixes))
exp = ARRAY_SIZE(binary_prefixes) - 1;
*i >>= (10 * exp);
return exp;
}
static const char *print_label(const char *drive_label, bool removable)
{
if(drive_label != NULL && drive_label[0] != '\0')
return drive_label;
if(removable)
return _("Removable Drive");
return _("Internal Drive");
}
static input_item_t *input_item_NewDrive(const char *drive_label, const char *path, uint64_t size, bool removable)
{
int r = 0;
input_item_t *ret = NULL;
char *uri = NULL;
char *label = NULL;
uri = vlc_path2uri(path, "file");
if(!uri)
return NULL;
int prefix = human(&size);
r = asprintf(&label, "%s (%" PRIu64 " %s)", print_label(drive_label, removable), size, vlc_gettext(binary_prefixes[prefix]));
if(r == -1)
{
free(uri);
return NULL;
}
ret = input_item_NewDirectory(uri, label, ITEM_LOCAL);
free(uri);
free(label);
return ret;
}
static int fs_properties_changed(sd_bus_message *m, void *userdata, sd_bus_error *err)
{
VLC_UNUSED(err);
int r;
struct fs_properties_changed_param *param = userdata;
services_discovery_t *sd = param->sd;
struct discovery_sys *p_sys = sd->p_sys;
const char *interface_name;
r = sd_bus_message_read(m, "s", &interface_name);
if(r < 0)
return r;
if(strcmp(interface_name, DBUS_INTERFACE_UDISKS2_FILESYSTEM) != 0)
return 0;
size_t mount_path_len;
const char *mount_path = NULL;
char *property_name = NULL;
r = sd_bus_message_enter_container(m, 'a', "{sv}");
if(r < 0)
return r;
for(;;)
{
r = sd_bus_message_enter_container(m, 'e', "sv");
if (r < 0)
return r;
r = sd_bus_message_read(m, "s", &property_name);
if(r < 0)
return r;
if (r == 0)
return 0;
if(strcmp(property_name, "MountPoints") == 0)
break;
}
r = sd_bus_message_enter_container(m, 'v', "aay");
if(r < 0)
return r;
r = sd_bus_message_enter_container(m, 'a', "ay");
if(r < 0)
return r;
const void *path;
r = sd_bus_message_read_array(m, 'y', &path, &mount_path_len);
mount_path = path;
if(r < 0)
return r;
struct device_info *info = vlc_dictionary_value_for_key(&p_sys->entries, param->object_path);
if(!info)
return -1;
if(mount_path_len)
{
info->item = input_item_NewDrive(info->label, mount_path, info->size, info->removable);
services_discovery_AddItem(sd, info->item);
}
else
services_discovery_RemoveItem(sd, info->item);
return 1;
}
static int get_info_from_block_device(services_discovery_t *sd, const char *block_path, struct device_info **info_ret)
{
struct discovery_sys *p_sys = sd->p_sys;
sd_bus *bus = p_sys->bus;
sd_bus_error err = SD_BUS_ERROR_NULL;
int r = 0;
struct device_info *info = NULL;
size_t mount_path_len;
const char *drive_path = NULL;
const char *mount_path = NULL;
sd_bus_message *drive_reply = NULL;
sd_bus_message *mounts_reply = NULL;
int autoclear;
r = sd_bus_get_property_trivial(bus, DBUS_INTERFACE_UDISKS2,
block_path, DBUS_INTERFACE_UDISKS2_LOOP,
"Autoclear", &err, 'b', &autoclear);
if(r == 0)
{
msg_Dbg(sd, "Ignoring loop device: %s\n", block_path);
goto error;
}
if(r < 0 && r != -EINVAL)
{
msg_Err(sd, "%s: %s\n", err.name, err.message);
goto error;
}
sd_bus_error_free( &err );
err = SD_BUS_ERROR_NULL;
r = sd_bus_get_property(bus, DBUS_INTERFACE_UDISKS2,
block_path, DBUS_INTERFACE_UDISKS2_FILESYSTEM,
"MountPoints", &err, &mounts_reply, "aay");
if(r == -EINVAL)
{
r = 0;
msg_Dbg(sd, "%s block device does not contain any file system", block_path);
goto error;
}
if(r < 0)
{
msg_Err(sd, "%s: %s\n", err.name, err.message);
goto error;
}
r = sd_bus_message_enter_container(mounts_reply, 'a', "ay");
if(r < 0)
goto error;
const void *path;
r = sd_bus_message_read_array(mounts_reply, 'y', &path, &mount_path_len);
mount_path = path;
if(r < 0)
goto error;
info = calloc(1, sizeof(struct device_info));
if(!info)
goto generic_error;
info->param = malloc(sizeof(struct fs_properties_changed_param));
if(!info->param)
goto generic_error;
info->param->sd = sd;
info->param->object_path = strdup(block_path);
if(!info->param->object_path)
goto generic_error;
r = sd_bus_match_signal(bus, &info->slot,
NULL, block_path,
"org.freedesktop.DBus.Properties", "PropertiesChanged",
fs_properties_changed, info->param);
if(r < 0)
goto error;
r = sd_bus_get_property_trivial(bus, DBUS_INTERFACE_UDISKS2,
block_path,
DBUS_INTERFACE_UDISKS2_BLOCKS, "Size",
&err, 't', &info->size);
if(r < 0)
{
msg_Err(sd, "%s: %s\n", err.name, err.message);
goto error;
}
r = sd_bus_get_property(bus, DBUS_INTERFACE_UDISKS2,
block_path, DBUS_INTERFACE_UDISKS2_BLOCKS,
"Drive", &err, &drive_reply, "o");
if(r < 0)
{
msg_Err(sd, "%s: %s\n", err.name, err.message);
goto error;
}
r = sd_bus_message_read(drive_reply, "o", &drive_path);
if(r < 0)
goto error;
if(strcmp(drive_path, "/") != 0)
{
r = sd_bus_get_property_trivial(bus, DBUS_INTERFACE_UDISKS2,
drive_path,
DBUS_INTERFACE_UDISKS2_DRIVE, "Removable",
&err, 'b', &info->removable);
if(r < 0)
{
msg_Err(sd, "%s: %s\n", err.name, err.message);
goto error;
}
}
r = sd_bus_get_property_string(bus, DBUS_INTERFACE_UDISKS2,
block_path,
DBUS_INTERFACE_UDISKS2_BLOCKS, "IdLabel",
&err, &info->label);
if(r < 0)
{
msg_Err(sd, "%s: %s\n", err.name, err.message);
goto error;
}
if(mount_path)
{
info->item = input_item_NewDrive(info->label, mount_path, info->size, info->removable);
if(!info->item)
goto generic_error;
}
sd_bus_message_unref(drive_reply);
sd_bus_error_free(&err);
*info_ret = info;
return 1;
generic_error:
r = -1;
error:
sd_bus_error_free(&err);
if(drive_reply)
sd_bus_message_unref(drive_reply);
if(mounts_reply)
sd_bus_message_unref(mounts_reply);
if(info)
release_device_info(sd, info);
return r;
}
static void FreeEntries(void *p_value, void *p_obj)
{
services_discovery_t *sd = p_obj;
struct device_info *info = p_value;
if(info)
release_device_info(sd, info);
}
static int interfaces_added_cb(sd_bus_message *m, void *userdata, sd_bus_error *ret_error)
{
VLC_UNUSED(ret_error);
int r;
services_discovery_t *sd = userdata;
struct discovery_sys *p_sys = sd->p_sys;
struct device_info *info = NULL;
const char *path = NULL;
r = sd_bus_message_read(m, "o", &path);
if(r < 0)
return r;
if(strncmp(path, DBUS_PATH_UDISKS2_BLOCK_DEV, strlen(DBUS_PATH_UDISKS2_BLOCK_DEV)) != 0)
return 0;
r = get_info_from_block_device(sd, path, &info);
if(r < 0)
{
if(info)
release_device_info(sd, info);
return r;
}
if(!info)
return 0;
vlc_dictionary_insert(&p_sys->entries, path, info);
if(info->item)
services_discovery_AddItem(sd, info->item);
return 1;
}
static int interfaces_removed_cb(sd_bus_message *m, void *userdata, sd_bus_error *ret_error)
{
VLC_UNUSED(ret_error);
int r;
services_discovery_t *sd = userdata;
struct discovery_sys *p_sys = sd->p_sys;
const char *path;
r = sd_bus_message_read(m, "o", &path);
if(r < 0)
return r;
if(strncmp(path, DBUS_PATH_UDISKS2_BLOCK_DEV, strlen(DBUS_PATH_UDISKS2_BLOCK_DEV)) != 0)
return 0;
struct device_info *info = vlc_dictionary_value_for_key(&p_sys->entries, path);
if(!info)
return 0;
vlc_dictionary_remove_value_for_key(&p_sys->entries, path, FreeEntries, sd);
return 1;
}
static void *Run(void *p_obj)
{
int r;
int canc = vlc_savecancel();
services_discovery_t *sd = p_obj;
struct discovery_sys *p_sys = sd->p_sys;
sd_bus *bus = p_sys->bus;
r = sd_bus_match_signal(bus, &p_sys->interface_added_slot,
DBUS_INTERFACE_UDISKS2, DBUS_PATH_UDISKS2,
"org.freedesktop.DBus.ObjectManager", "InterfacesAdded",
interfaces_added_cb, sd);
if(r < 0)
{
return NULL;
}
r = sd_bus_match_signal(bus, &p_sys->interface_removed_slot,
DBUS_INTERFACE_UDISKS2, DBUS_PATH_UDISKS2,
"org.freedesktop.DBus.ObjectManager", "InterfacesRemoved",
interfaces_removed_cb, sd);
if(r < 0)
{
sd_bus_slot_unref(p_sys->interface_added_slot);
return NULL;
}
struct pollfd ufd[1];
ufd[0].fd = sd_bus_get_fd(bus);
ufd[0].events = sd_bus_get_events(bus);
for(;;)
{
vlc_restorecancel(canc);
while(poll(ufd, 1, -1) < 0);
canc = vlc_savecancel();
sd_bus_message *msg = NULL;
r = sd_bus_process(bus, &msg);
if(r < 0)
{
msg_Err(sd, "Couldn't process new d-bus event : %d", -r);
break;
}
sd_bus_message_unref(msg);
}
sd_bus_slot_unref(p_sys->interface_added_slot);
sd_bus_slot_unref(p_sys->interface_removed_slot);
return NULL;
}
static int Open(vlc_object_t *p_obj)
{
services_discovery_t *sd = (services_discovery_t *)p_obj;
struct discovery_sys *p_sys = vlc_alloc(1, sizeof(struct discovery_sys));
struct device_info *info = NULL;
if (!p_sys)
return VLC_ENOMEM;
sd->p_sys = p_sys;
sd->description = _("Local drives discovery");
vlc_dictionary_init(&p_sys->entries, 0);
int r;
/* connect to the session bus */
r = sd_bus_open_system(&p_sys->bus);
if(r < 0)
goto error;
sd_bus *bus = p_sys->bus;
sd_bus_message *reply = NULL;
sd_bus_error err = SD_BUS_ERROR_NULL;
r = sd_bus_call_method(bus, DBUS_INTERFACE_UDISKS2, DBUS_PATH_UDISKS2_MANAGER,
DBUS_INTERFACE_UDISKS2_MANAGER, "GetBlockDevices",
&err, &reply, "a{sv}", NULL);
if (r < 0)
{
msg_Err(sd, "%s: %s\n", err.name, err.message);
goto error;
}
r = sd_bus_message_enter_container(reply, 'a', "o");
if (r < 0)
goto error;
char *block_path = NULL;
while ((r = sd_bus_message_read(reply, "o", &block_path)) != 0)
{
info = NULL;
if(r < 0)
goto error;
r = get_info_from_block_device(sd, block_path, &info);
if(r < 0)
goto error;
if(!info)
continue;
vlc_dictionary_insert(&p_sys->entries, block_path, info);
if(info->item)
services_discovery_AddItem(sd, info->item);
}
sd_bus_message_unref(reply);
if (vlc_clone(&p_sys->thread, Run, sd))
goto error;
sd_bus_error_free(&err);
return VLC_SUCCESS;
error:
if(info)
release_device_info(sd, info);
vlc_dictionary_clear(&p_sys->entries, FreeEntries, sd);
if(p_sys->bus)
{
sd_bus_flush(p_sys->bus);
sd_bus_close(p_sys->bus);
}
sd_bus_error_free(&err);
free(p_sys);
return VLC_EGENERIC;
}
static void Close(vlc_object_t *p_obj)
{
services_discovery_t *sd = (services_discovery_t *)p_obj;
struct discovery_sys *p_sys = sd->p_sys;
if(p_sys->interface_added_slot)
sd_bus_slot_unref(p_sys->interface_added_slot);
sd_bus_flush(p_sys->bus);
sd_bus_close(p_sys->bus);
vlc_cancel(p_sys->thread);
vlc_join(p_sys->thread, NULL);
vlc_dictionary_clear(&p_sys->entries, FreeEntries, sd);
free(p_sys);
}
VLC_SD_PROBE_HELPER("udisks", N_("UDisks2"), SD_CAT_DEVICES)
/*
* Module descriptor
*/
vlc_module_begin()
set_shortname( "UDisks" )
set_description( N_( "Local Drives (UDisks)" ) )
set_subcategory( SUBCAT_PLAYLIST_SD )
set_capability( "services_discovery", 0 )
set_callbacks( Open, Close )
add_shortcut( "udisks" )
VLC_SD_PROBE_SUBMODULE
vlc_module_end ()