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adv_monitor.c
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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2020 Google LLC
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <glib.h>
#include <dbus/dbus.h>
#include <gdbus/gdbus.h>
#include "lib/bluetooth.h"
#include "lib/mgmt.h"
#include "adapter.h"
#include "btd.h"
#include "dbus-common.h"
#include "device.h"
#include "log.h"
#include "src/error.h"
#include "src/shared/mgmt.h"
#include "src/shared/queue.h"
#include "src/shared/timeout.h"
#include "src/shared/util.h"
#include "adv_monitor.h"
#define ADV_MONITOR_INTERFACE "org.bluez.AdvertisementMonitor1"
#define ADV_MONITOR_MGR_INTERFACE "org.bluez.AdvertisementMonitorManager1"
#define ADV_MONITOR_UNSET_RSSI 127 /* dBm */
#define ADV_MONITOR_MAX_RSSI 20 /* dBm */
#define ADV_MONITOR_MIN_RSSI -127 /* dBm */
#define ADV_MONITOR_UNSET_TIMEOUT 0 /* second */
#define ADV_MONITOR_MIN_TIMEOUT 1 /* second */
#define ADV_MONITOR_MAX_TIMEOUT 300 /* second */
#define ADV_MONITOR_DEFAULT_LOW_TIMEOUT 5 /* second */
#define ADV_MONITOR_DEFAULT_HIGH_TIMEOUT 10 /* second */
#define ADV_MONITOR_UNSET_SAMPLING_PERIOD 256 /* 100 ms */
#define ADV_MONITOR_MAX_SAMPLING_PERIOD 255 /* 100 ms */
struct btd_adv_monitor_manager {
struct btd_adapter *adapter;
struct mgmt *mgmt;
uint16_t adapter_id;
uint32_t supported_features; /* MGMT_ADV_MONITOR_FEATURE_MASK_* */
uint32_t enabled_features; /* MGMT_ADV_MONITOR_FEATURE_MASK_* */
uint16_t max_num_monitors;
uint8_t max_num_patterns;
struct queue *apps; /* apps who registered for Adv monitoring */
struct queue *merged_patterns;
};
struct adv_monitor_app {
struct btd_adv_monitor_manager *manager;
char *owner;
char *path;
DBusMessage *reg;
GDBusClient *client;
struct queue *monitors;
};
enum monitor_type {
MONITOR_TYPE_NONE,
MONITOR_TYPE_OR_PATTERNS,
};
enum monitor_state {
MONITOR_STATE_NEW, /* New but not yet init'ed with actual values */
MONITOR_STATE_FAILED, /* Failed to be init'ed */
MONITOR_STATE_INITED, /* Init'ed but not yet sent to kernel */
MONITOR_STATE_ACTIVE, /* Accepted by kernel */
MONITOR_STATE_REMOVED, /* Removed from kernel */
MONITOR_STATE_RELEASED, /* Dbus Object removed by app */
};
enum merged_pattern_state {
MERGED_PATTERN_STATE_ADDING, /* Adding pattern to kernel */
MERGED_PATTERN_STATE_REMOVING, /* Removing pattern from kernel */
MERGED_PATTERN_STATE_STABLE, /* Idle */
};
struct rssi_parameters {
int8_t high_rssi; /* High RSSI threshold */
uint16_t high_rssi_timeout; /* High RSSI threshold timeout */
int8_t low_rssi; /* Low RSSI threshold */
uint16_t low_rssi_timeout; /* Low RSSI threshold timeout */
uint16_t sampling_period; /* Merge packets in the same timeslot.
* Currenly unimplemented in user space.
* Used only to pass data to kernel.
*/
};
struct adv_monitor {
struct adv_monitor_app *app;
GDBusProxy *proxy;
char *path;
enum monitor_state state; /* MONITOR_STATE_* */
struct rssi_parameters rssi; /* RSSI parameter for this monitor */
struct adv_monitor_merged_pattern *merged_pattern;
struct queue *devices; /* List of adv_monitor_device objects */
};
/* Some chipsets doesn't support multiple monitors with the same pattern.
* To solve that and to generally ease their task, we merge monitors with the
* same pattern, so those monitors will only be sent once to the kernel.
*/
struct adv_monitor_merged_pattern {
struct btd_adv_monitor_manager *manager;
uint16_t monitor_handle; /* Kernel Monitor Handle */
struct rssi_parameters rssi; /* Merged RSSI parameter for |monitors|,
* this will be sent to the kernel.
*/
struct queue *monitors; /* List of adv_monitor objects which
* have this pattern
*/
enum monitor_type type; /* MONITOR_TYPE_* */
struct queue *patterns; /* List of bt_ad_pattern objects */
enum merged_pattern_state current_state; /* MERGED_PATTERN_STATE_* */
enum merged_pattern_state next_state; /* MERGED_PATTERN_STATE_* */
};
/* Some data like last_seen, timer/timeout values need to be maintained
* per device. struct adv_monitor_device maintains such data.
*/
struct adv_monitor_device {
struct adv_monitor *monitor;
struct btd_device *device;
time_t high_rssi_first_seen; /* Start time when RSSI climbs above
* the high RSSI threshold
*/
time_t low_rssi_first_seen; /* Start time when RSSI drops below
* the low RSSI threshold
*/
time_t last_seen; /* Time when last Adv was received */
bool found; /* State of the device - lost/found */
unsigned int lost_timer; /* Timer to track if the device goes
* offline/out-of-range
*/
};
struct app_match_data {
const char *owner;
const char *path;
};
struct adv_content_filter_info {
struct bt_ad *ad;
struct queue *matched_monitors; /* List of matched monitors */
};
struct adv_rssi_filter_info {
struct btd_device *device;
int8_t rssi;
};
struct monitored_device_info {
uint16_t monitor_handle; /* Kernel Monitor Handle */
struct btd_device *device;
};
static void monitor_device_free(void *data);
static void adv_monitor_filter_rssi(struct adv_monitor *monitor,
struct btd_device *device, int8_t rssi);
static void merged_pattern_send_add(
struct adv_monitor_merged_pattern *merged_pattern);
static void merged_pattern_send_remove(
struct adv_monitor_merged_pattern *merged_pattern);
const struct adv_monitor_type {
enum monitor_type type;
const char *name;
} supported_types[] = {
{ MONITOR_TYPE_OR_PATTERNS, "or_patterns" },
{ },
};
static void rssi_unset(struct rssi_parameters *rssi)
{
rssi->high_rssi = ADV_MONITOR_UNSET_RSSI;
rssi->high_rssi_timeout = ADV_MONITOR_UNSET_TIMEOUT;
rssi->low_rssi = ADV_MONITOR_UNSET_RSSI;
rssi->low_rssi_timeout = ADV_MONITOR_UNSET_TIMEOUT;
rssi->sampling_period = ADV_MONITOR_UNSET_SAMPLING_PERIOD;
}
static bool rssi_is_unset(const struct rssi_parameters *rssi)
{
return rssi->high_rssi == ADV_MONITOR_UNSET_RSSI &&
rssi->low_rssi == ADV_MONITOR_UNSET_RSSI &&
rssi->high_rssi_timeout == ADV_MONITOR_UNSET_TIMEOUT &&
rssi->low_rssi_timeout == ADV_MONITOR_UNSET_TIMEOUT &&
rssi->sampling_period == ADV_MONITOR_UNSET_SAMPLING_PERIOD;
}
/* Replies to an app's D-Bus message and unref it */
static void app_reply_msg(struct adv_monitor_app *app, DBusMessage *reply)
{
if (!app || !app->reg || !reply)
return;
g_dbus_send_message(btd_get_dbus_connection(), reply);
dbus_message_unref(app->reg);
app->reg = NULL;
}
/* Frees a pattern */
static void pattern_free(void *data)
{
struct bt_ad_pattern *pattern = data;
free(pattern);
}
static void merged_pattern_free(void *data)
{
struct adv_monitor_merged_pattern *merged_pattern = data;
queue_destroy(merged_pattern->patterns, pattern_free);
queue_destroy(merged_pattern->monitors, NULL);
if (merged_pattern->manager)
queue_remove(merged_pattern->manager->merged_patterns,
merged_pattern);
free(merged_pattern);
}
/* Returns the smaller of the two integers |a| and |b| which is not equal to the
* |unset| value. If both are unset, return unset.
*/
static int get_smaller_not_unset(int a, int b, int unset)
{
if (a == unset)
return b;
if (b == unset)
return a;
return a < b ? a : b;
}
/* Merges two RSSI parameters, return the result. The result is chosen to be
* whichever is more lenient of the two inputs, so we can pass that to the
* kernel and still do additional filtering in the user space without loss of
* information while still receiving benefit from offloading some filtering to
* the hardware.
* It is allowed for |a|, |b|, and |merged| to point to the same object.
*/
static void merge_rssi(const struct rssi_parameters *a,
const struct rssi_parameters *b,
struct rssi_parameters *merged)
{
/* For low rssi, low_timeout, and high_rssi, choose the minimum of the
* two values. Filtering the higher values is done on userspace.
*/
merged->low_rssi = get_smaller_not_unset(a->low_rssi, b->low_rssi,
ADV_MONITOR_UNSET_RSSI);
merged->high_rssi = get_smaller_not_unset(a->high_rssi, b->high_rssi,
ADV_MONITOR_UNSET_RSSI);
merged->low_rssi_timeout = get_smaller_not_unset(a->low_rssi_timeout,
b->low_rssi_timeout,
ADV_MONITOR_UNSET_TIMEOUT);
/* High timeout doesn't matter for now, it will be zeroed when it is
* forwarded to kernel anyway.
*/
merged->high_rssi_timeout = 0;
/* Sampling period is not implemented yet in userspace. There is no
* good value if the two values are different, so just choose 0 for
* always reporting, to avoid missing packets.
*/
if (a->sampling_period != b->sampling_period)
merged->sampling_period = 0;
else
merged->sampling_period = a->sampling_period;
}
/* Two merged_pattern are considered equal if all the following are true:
* (1) both has the same monitor_type
* (2) both has exactly the same pattern in the same order
* Therefore, patterns A+B and B+A are considered different, as well as patterns
* A and A+A. This shouldn't cause any issue, but solving this issue is a
* potential improvement.
*/
static bool merged_pattern_is_equal(const void *data, const void *match_data)
{
const struct adv_monitor_merged_pattern *a = data;
const struct adv_monitor_merged_pattern *b = match_data;
const struct queue_entry *a_entry, *b_entry;
struct bt_ad_pattern *a_data, *b_data;
if (a->type != b->type)
return false;
if (queue_length(a->patterns) != queue_length(b->patterns))
return false;
a_entry = queue_get_entries(a->patterns);
b_entry = queue_get_entries(b->patterns);
while (a_entry) {
a_data = a_entry->data;
b_data = b_entry->data;
if (a_data->type != b_data->type ||
a_data->offset != b_data->offset ||
a_data->len != b_data->len ||
memcmp(a_data->data, b_data->data, a_data->len) != 0)
return false;
a_entry = a_entry->next;
b_entry = b_entry->next;
}
return true;
}
static char *get_merged_pattern_state_name(enum merged_pattern_state state)
{
switch (state) {
case MERGED_PATTERN_STATE_ADDING:
return "Adding";
case MERGED_PATTERN_STATE_REMOVING:
return "Removing";
case MERGED_PATTERN_STATE_STABLE:
return "Stable";
}
return NULL;
}
/* Adds a new merged pattern */
static void merged_pattern_add(
struct adv_monitor_merged_pattern *merged_pattern)
{
/* This is only called when no merged_pattern found. Therefore, the
* state must be stable.
*/
if (merged_pattern->current_state != MERGED_PATTERN_STATE_STABLE) {
btd_error(merged_pattern->manager->adapter_id,
"Add merged_pattern request when state is not stable");
return;
}
merged_pattern->current_state = MERGED_PATTERN_STATE_ADDING;
merged_pattern_send_add(merged_pattern);
DBG("Monitor state: %s -> %s",
get_merged_pattern_state_name(merged_pattern->current_state),
get_merged_pattern_state_name(merged_pattern->next_state));
}
/* Removes merged pattern, or queues for removal if busy */
static void merged_pattern_remove(
struct adv_monitor_merged_pattern *merged_pattern)
{
rssi_unset(&merged_pattern->rssi);
/* If we currently are removing, cancel subsequent ADD command if any */
if (merged_pattern->current_state == MERGED_PATTERN_STATE_REMOVING) {
merged_pattern->next_state = MERGED_PATTERN_STATE_STABLE;
goto print_state;
}
/* If stable, we can proceed with removal right away */
if (merged_pattern->current_state == MERGED_PATTERN_STATE_STABLE) {
merged_pattern->current_state = MERGED_PATTERN_STATE_REMOVING;
merged_pattern_send_remove(merged_pattern);
} else {
/* otherwise queue the removal */
merged_pattern->next_state = MERGED_PATTERN_STATE_REMOVING;
}
print_state:
DBG("Monitor state: %s -> %s",
get_merged_pattern_state_name(merged_pattern->current_state),
get_merged_pattern_state_name(merged_pattern->next_state));
}
/* Replaces (removes and re-adds) merged pattern, or queues it if busy */
static void merged_pattern_replace(
struct adv_monitor_merged_pattern *merged_pattern,
const struct rssi_parameters *rssi)
{
/* If the RSSI are the same then nothing needs to be done, except on
* the case where pattern is being removed. In that case, we need to
* re-add the pattern.
* high_rssi_timeout is purposedly left out in the comparison since
* the value is ignored upon submission to kernel.
*/
if (merged_pattern->rssi.high_rssi == rssi->high_rssi &&
merged_pattern->rssi.low_rssi == rssi->low_rssi &&
merged_pattern->rssi.low_rssi_timeout == rssi->low_rssi_timeout &&
merged_pattern->rssi.sampling_period == rssi->sampling_period &&
merged_pattern->current_state != MERGED_PATTERN_STATE_REMOVING &&
merged_pattern->next_state != MERGED_PATTERN_STATE_REMOVING)
return;
merged_pattern->rssi = *rssi;
/* If stable, we can proceed with replacement. */
if (merged_pattern->current_state == MERGED_PATTERN_STATE_STABLE) {
/* Replacement is done by first removing, then re-adding */
merged_pattern->current_state = MERGED_PATTERN_STATE_REMOVING;
merged_pattern->next_state = MERGED_PATTERN_STATE_ADDING;
merged_pattern_send_remove(merged_pattern);
} else {
/* otherwise queue the replacement */
merged_pattern->next_state = MERGED_PATTERN_STATE_ADDING;
}
DBG("Monitor state: %s -> %s",
get_merged_pattern_state_name(merged_pattern->current_state),
get_merged_pattern_state_name(merged_pattern->next_state));
}
/* Current_state of merged_pattern is done, proceed to the next_state */
static void merged_pattern_process_next_step(
struct adv_monitor_merged_pattern *mp)
{
if (mp->current_state == MERGED_PATTERN_STATE_STABLE) {
btd_error(mp->manager->adapter_id,
"Merged pattern invalid current state");
return;
}
if (mp->current_state == MERGED_PATTERN_STATE_REMOVING) {
/* We might need to follow-up with re-adding the pattern */
if (mp->next_state == MERGED_PATTERN_STATE_ADDING) {
mp->current_state = MERGED_PATTERN_STATE_ADDING;
mp->next_state = MERGED_PATTERN_STATE_STABLE;
merged_pattern_send_add(mp);
goto print_state;
}
/* We should never end up with remove-remove sequence */
if (mp->next_state == MERGED_PATTERN_STATE_REMOVING)
btd_error(mp->manager->adapter_id,
"Merged pattern can't be removed again");
/* No more operations */
mp->current_state = MERGED_PATTERN_STATE_STABLE;
mp->next_state = MERGED_PATTERN_STATE_STABLE;
goto print_state;
}
/* current_state == MERGED_PATTERN_STATE_ADDING */
if (mp->next_state == MERGED_PATTERN_STATE_REMOVING) {
mp->current_state = MERGED_PATTERN_STATE_REMOVING;
mp->next_state = MERGED_PATTERN_STATE_STABLE;
merged_pattern_send_remove(mp);
goto print_state;
} else if (mp->next_state == MERGED_PATTERN_STATE_ADDING) {
/* To re-add a just added pattern, we need to remove it first */
mp->current_state = MERGED_PATTERN_STATE_REMOVING;
mp->next_state = MERGED_PATTERN_STATE_ADDING;
merged_pattern_send_remove(mp);
goto print_state;
}
/* No more operations */
mp->current_state = MERGED_PATTERN_STATE_STABLE;
mp->next_state = MERGED_PATTERN_STATE_STABLE;
print_state:
DBG("Monitor state: %s -> %s",
get_merged_pattern_state_name(mp->current_state),
get_merged_pattern_state_name(mp->next_state));
}
/* Frees a monitor object */
static void monitor_free(struct adv_monitor *monitor)
{
g_dbus_proxy_unref(monitor->proxy);
g_free(monitor->path);
queue_destroy(monitor->devices, monitor_device_free);
monitor->devices = NULL;
free(monitor);
}
/* Calls Release() method of the remote Adv Monitor */
static void monitor_release(struct adv_monitor *monitor)
{
/* Release() method on a monitor can be called when -
* 1. monitor initialization failed
* 2. app calls UnregisterMonitor and monitors held by app are released,
* it may or may not be activated at this point
* 3. monitor is removed by kernel
*/
if (monitor->state != MONITOR_STATE_FAILED &&
monitor->state != MONITOR_STATE_INITED &&
monitor->state != MONITOR_STATE_ACTIVE &&
monitor->state != MONITOR_STATE_REMOVED) {
return;
}
DBG("Calling Release() on Adv Monitor of owner %s at path %s",
monitor->app->owner, monitor->path);
g_dbus_proxy_method_call(monitor->proxy, "Release", NULL, NULL, NULL,
NULL);
}
/* Removes monitor from the merged_pattern. This would result in removing it
* from the kernel if there is only one such monitor with that pattern.
*/
static void monitor_remove(struct adv_monitor *monitor)
{
struct adv_monitor_app *app = monitor->app;
uint16_t adapter_id = app->manager->adapter_id;
struct adv_monitor_merged_pattern *merged_pattern;
const struct queue_entry *e;
struct rssi_parameters rssi;
/* Monitor from kernel can be removed when -
* 1. monitor object is deleted by app - may or may not be activated
* 2. app is destroyed and monitors held by app are marked as released
*/
if (monitor->state != MONITOR_STATE_INITED &&
monitor->state != MONITOR_STATE_ACTIVE &&
monitor->state != MONITOR_STATE_RELEASED) {
return;
}
monitor->state = MONITOR_STATE_REMOVED;
if (!monitor->merged_pattern) {
btd_error(adapter_id,
"Merged_pattern not found when removing monitor");
return;
}
merged_pattern = monitor->merged_pattern;
monitor->merged_pattern = NULL;
queue_remove(merged_pattern->monitors, monitor);
/* No more monitors - just remove the pattern entirely */
if (queue_length(merged_pattern->monitors) == 0) {
merged_pattern_remove(merged_pattern);
return;
}
/* Calculate the merge result of the RSSIs of the monitors with the
* same pattern, minus the monitor being removed.
*/
rssi_unset(&rssi);
for (e = queue_get_entries(merged_pattern->monitors); e; e = e->next) {
struct adv_monitor *m = e->data;
merge_rssi(&rssi, &m->rssi, &rssi);
}
merged_pattern_replace(merged_pattern, &rssi);
}
/* Destroys monitor object */
static void monitor_destroy(void *data)
{
struct adv_monitor *monitor = data;
if (!monitor)
return;
queue_remove(monitor->app->monitors, monitor);
monitor_release(monitor);
monitor_remove(monitor);
monitor_free(monitor);
}
/* Destroys an app object along with related D-Bus handlers */
static void app_destroy(void *data)
{
struct adv_monitor_app *app = data;
if (!app)
return;
DBG("Destroy Adv Monitor app %s at path %s", app->owner, app->path);
queue_destroy(app->monitors, monitor_destroy);
if (app->reg) {
app_reply_msg(app, btd_error_failed(app->reg,
"Adv Monitor app destroyed"));
}
if (app->client) {
g_dbus_client_set_disconnect_watch(app->client, NULL, NULL);
g_dbus_client_set_proxy_handlers(app->client, NULL, NULL, NULL,
NULL);
g_dbus_client_set_ready_watch(app->client, NULL, NULL);
g_dbus_client_unref(app->client);
}
g_free(app->owner);
g_free(app->path);
free(app);
}
/* Updates monitor state to 'released' */
static void monitor_state_released(void *data, void *user_data)
{
struct adv_monitor *monitor = data;
if (!monitor || (monitor->state != MONITOR_STATE_INITED
&& monitor->state != MONITOR_STATE_ACTIVE))
return;
monitor->state = MONITOR_STATE_RELEASED;
}
/* Updates monitor state to 'active' */
static void monitor_state_active(void *data, void *user_data)
{
struct adv_monitor *monitor = data;
if (!monitor || monitor->state != MONITOR_STATE_INITED)
return;
monitor->state = MONITOR_STATE_ACTIVE;
DBG("Calling Activate() on Adv Monitor of owner %s at path %s",
monitor->app->owner, monitor->path);
g_dbus_proxy_method_call(monitor->proxy, "Activate", NULL,
NULL, NULL, NULL);
}
/* Handles a D-Bus disconnection event of an app */
static void app_disconnect_cb(DBusConnection *conn, void *user_data)
{
struct adv_monitor_app *app = user_data;
if (!app) {
error("Unexpected NULL app object upon app disconnect");
return;
}
btd_info(app->manager->adapter_id,
"Adv Monitor app %s disconnected from D-Bus",
app->owner);
if (queue_remove(app->manager->apps, app)) {
queue_foreach(app->monitors, monitor_state_released, NULL);
app_destroy(app);
}
}
/* Handles the ready signal of Adv Monitor app */
static void app_ready_cb(GDBusClient *client, void *user_data)
{
struct adv_monitor_app *app = user_data;
uint16_t adapter_id = app->manager->adapter_id;
btd_info(adapter_id, "Path %s reserved for Adv Monitor app %s",
app->path, app->owner);
app_reply_msg(app, dbus_message_new_method_return(app->reg));
}
/* Allocates an Adv Monitor */
static struct adv_monitor *monitor_new(struct adv_monitor_app *app,
GDBusProxy *proxy)
{
struct adv_monitor *monitor;
if (!app || !proxy)
return NULL;
monitor = new0(struct adv_monitor, 1);
if (!monitor)
return NULL;
monitor->app = app;
monitor->proxy = g_dbus_proxy_ref(proxy);
monitor->path = g_strdup(g_dbus_proxy_get_path(proxy));
monitor->state = MONITOR_STATE_NEW;
rssi_unset(&monitor->rssi);
monitor->devices = queue_new();
return monitor;
}
/* Matches a monitor based on its D-Bus path */
static bool monitor_match(const void *a, const void *b)
{
const GDBusProxy *proxy = b;
const struct adv_monitor *monitor = a;
if (!proxy || !monitor)
return false;
if (g_strcmp0(g_dbus_proxy_get_path(proxy), monitor->path) != 0)
return false;
return true;
}
/* Retrieves Type from the remote Adv Monitor object, verifies the value and
* update the local Adv Monitor
*/
static bool parse_monitor_type(struct adv_monitor *monitor, const char *path)
{
DBusMessageIter iter;
const struct adv_monitor_type *t;
const char *type_str;
uint16_t adapter_id = monitor->app->manager->adapter_id;
if (!g_dbus_proxy_get_property(monitor->proxy, "Type", &iter)) {
btd_error(adapter_id,
"Failed to retrieve property Type from the "
"Adv Monitor at path %s", path);
return false;
}
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
goto failed;
dbus_message_iter_get_basic(&iter, &type_str);
for (t = supported_types; t->name; t++) {
if (strcmp(t->name, type_str) == 0) {
monitor->merged_pattern->type = t->type;
return true;
}
}
failed:
btd_error(adapter_id,
"Invalid argument of property Type of the Adv Monitor "
"at path %s", path);
return false;
}
/* Retrieves RSSI thresholds and timeouts from the remote Adv Monitor object,
* verifies the values and update the local Adv Monitor
*/
static bool parse_rssi_and_timeout(struct adv_monitor *monitor,
const char *path)
{
DBusMessageIter iter;
GDBusProxy *proxy = monitor->proxy;
int16_t h_rssi = ADV_MONITOR_UNSET_RSSI;
int16_t l_rssi = ADV_MONITOR_UNSET_RSSI;
uint16_t h_rssi_timeout = ADV_MONITOR_UNSET_TIMEOUT;
uint16_t l_rssi_timeout = ADV_MONITOR_UNSET_TIMEOUT;
uint16_t sampling_period = ADV_MONITOR_UNSET_SAMPLING_PERIOD;
uint16_t adapter_id = monitor->app->manager->adapter_id;
/* Extract RSSIHighThreshold */
if (g_dbus_proxy_get_property(proxy, "RSSIHighThreshold", &iter)) {
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_INT16)
goto failed;
dbus_message_iter_get_basic(&iter, &h_rssi);
}
/* Extract RSSIHighTimeout */
if (g_dbus_proxy_get_property(proxy, "RSSIHighTimeout", &iter)) {
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT16)
goto failed;
dbus_message_iter_get_basic(&iter, &h_rssi_timeout);
}
/* Extract RSSILowThreshold */
if (g_dbus_proxy_get_property(proxy, "RSSILowThreshold", &iter)) {
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_INT16)
goto failed;
dbus_message_iter_get_basic(&iter, &l_rssi);
}
/* Extract RSSILowTimeout */
if (g_dbus_proxy_get_property(proxy, "RSSILowTimeout", &iter)) {
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT16)
goto failed;
dbus_message_iter_get_basic(&iter, &l_rssi_timeout);
}
/* Extract RSSISamplingPeriod */
if (g_dbus_proxy_get_property(proxy, "RSSISamplingPeriod", &iter)) {
if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT16)
goto failed;
dbus_message_iter_get_basic(&iter, &sampling_period);
}
/* Verify the values of RSSIs and their timeouts. All fields should be
* either set to the unset values or are set within valid ranges.
* If the fields are only partially set, we would try our best to fill
* in with some sane values.
*/
if (h_rssi == ADV_MONITOR_UNSET_RSSI &&
l_rssi == ADV_MONITOR_UNSET_RSSI &&
h_rssi_timeout == ADV_MONITOR_UNSET_TIMEOUT &&
l_rssi_timeout == ADV_MONITOR_UNSET_TIMEOUT &&
sampling_period == ADV_MONITOR_UNSET_SAMPLING_PERIOD) {
goto done;
}
if (l_rssi == ADV_MONITOR_UNSET_RSSI)
l_rssi = ADV_MONITOR_MIN_RSSI;
if (h_rssi == ADV_MONITOR_UNSET_RSSI)
h_rssi = l_rssi;
if (l_rssi_timeout == ADV_MONITOR_UNSET_TIMEOUT)
l_rssi_timeout = ADV_MONITOR_DEFAULT_LOW_TIMEOUT;
if (h_rssi_timeout == ADV_MONITOR_UNSET_TIMEOUT)
h_rssi_timeout = ADV_MONITOR_DEFAULT_HIGH_TIMEOUT;
if (sampling_period == ADV_MONITOR_UNSET_SAMPLING_PERIOD)
sampling_period = btd_opts.advmon.rssi_sampling_period;
if (h_rssi < ADV_MONITOR_MIN_RSSI || h_rssi > ADV_MONITOR_MAX_RSSI ||
l_rssi < ADV_MONITOR_MIN_RSSI ||
l_rssi > ADV_MONITOR_MAX_RSSI || h_rssi < l_rssi) {
goto failed;
}
if (h_rssi_timeout < ADV_MONITOR_MIN_TIMEOUT ||
h_rssi_timeout > ADV_MONITOR_MAX_TIMEOUT ||
l_rssi_timeout < ADV_MONITOR_MIN_TIMEOUT ||
l_rssi_timeout > ADV_MONITOR_MAX_TIMEOUT) {
goto failed;
}
if (sampling_period > ADV_MONITOR_MAX_SAMPLING_PERIOD)
goto failed;
monitor->rssi.high_rssi = h_rssi;
monitor->rssi.low_rssi = l_rssi;
monitor->rssi.high_rssi_timeout = h_rssi_timeout;
monitor->rssi.low_rssi_timeout = l_rssi_timeout;
monitor->rssi.sampling_period = sampling_period;
done:
DBG("Adv Monitor at %s initiated with high RSSI threshold %d, high "
"RSSI threshold timeout %d, low RSSI threshold %d, low RSSI "
"threshold timeout %d, sampling period %d", path,
monitor->rssi.high_rssi, monitor->rssi.high_rssi_timeout,
monitor->rssi.low_rssi, monitor->rssi.low_rssi_timeout,
monitor->rssi.sampling_period);
monitor->merged_pattern->rssi = monitor->rssi;
return true;
failed:
btd_error(adapter_id,
"Invalid argument of RSSI thresholds and timeouts "
"of the Adv Monitor at path %s",
path);
return false;
}
/* Retrieves Patterns from the remote Adv Monitor object, verifies the values
* and update the local Adv Monitor
*/
static bool parse_patterns(struct adv_monitor *monitor, const char *path)
{
DBusMessageIter array, array_iter;
uint16_t adapter_id = monitor->app->manager->adapter_id;
if (!g_dbus_proxy_get_property(monitor->proxy, "Patterns", &array)) {
btd_error(adapter_id,
"Failed to retrieve property Patterns from the "
"Adv Monitor at path %s", path);
return false;
}
if (dbus_message_iter_get_arg_type(&array) != DBUS_TYPE_ARRAY ||
dbus_message_iter_get_element_type(&array) !=
DBUS_TYPE_STRUCT) {
goto failed;
}
monitor->merged_pattern->patterns = queue_new();
dbus_message_iter_recurse(&array, &array_iter);
while (dbus_message_iter_get_arg_type(&array_iter) ==
DBUS_TYPE_STRUCT) {
int value_len;
uint8_t *value;
uint8_t offset, ad_type;
struct bt_ad_pattern *pattern;
DBusMessageIter struct_iter, value_iter;
dbus_message_iter_recurse(&array_iter, &struct_iter);
// Extract start position
if (dbus_message_iter_get_arg_type(&struct_iter) !=
DBUS_TYPE_BYTE) {
goto failed;
}
dbus_message_iter_get_basic(&struct_iter, &offset);
if (!dbus_message_iter_next(&struct_iter))
goto failed;
// Extract AD data type
if (dbus_message_iter_get_arg_type(&struct_iter) !=
DBUS_TYPE_BYTE) {
goto failed;
}
dbus_message_iter_get_basic(&struct_iter, &ad_type);
if (!dbus_message_iter_next(&struct_iter))
goto failed;
// Extract value of a pattern
if (dbus_message_iter_get_arg_type(&struct_iter) !=
DBUS_TYPE_ARRAY) {
goto failed;
}
dbus_message_iter_recurse(&struct_iter, &value_iter);
dbus_message_iter_get_fixed_array(&value_iter, &value,
&value_len);
pattern = bt_ad_pattern_new(ad_type, offset, value_len, value);
if (!pattern)
goto failed;
queue_push_tail(monitor->merged_pattern->patterns, pattern);
dbus_message_iter_next(&array_iter);
}
/* There must be at least one pattern. */
if (queue_isempty(monitor->merged_pattern->patterns))
goto failed;
return true;
failed:
btd_error(adapter_id, "Invalid argument of property Patterns of the "
"Adv Monitor at path %s", path);
return false;
}
/* Processes the content of the remote Adv Monitor */
static bool monitor_process(struct adv_monitor *monitor)
{
const char *path = g_dbus_proxy_get_path(monitor->proxy);
monitor->state = MONITOR_STATE_FAILED;
monitor->merged_pattern = malloc0(sizeof(*monitor->merged_pattern));
monitor->merged_pattern->current_state = MERGED_PATTERN_STATE_STABLE;
monitor->merged_pattern->next_state = MERGED_PATTERN_STATE_STABLE;
if (!parse_monitor_type(monitor, path))
goto fail;
if (!parse_rssi_and_timeout(monitor, path))
goto fail;
if (monitor->merged_pattern->type != MONITOR_TYPE_OR_PATTERNS ||
!parse_patterns(monitor, path))
goto fail;
monitor->state = MONITOR_STATE_INITED;
monitor->merged_pattern->monitors = queue_new();
queue_push_tail(monitor->merged_pattern->monitors, monitor);
return true;
fail:
merged_pattern_free(monitor->merged_pattern);
monitor->merged_pattern = NULL;
return false;
}