Return-Path: From: Jakub Pawlowski To: linux-bluetooth@vger.kernel.org Cc: Jakub Pawlowski Subject: [PATCH v1 4/8] core: adapter: Add parameter parsing to SetDiscoveryFilter Date: Sat, 21 Mar 2015 15:15:31 -0700 Message-Id: <1426976135-2783-4-git-send-email-jpawlowski@google.com> In-Reply-To: <1426976135-2783-1-git-send-email-jpawlowski@google.com> References: <1426976135-2783-1-git-send-email-jpawlowski@google.com> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: This patch adds parameter parsing, and basic internal logic checks to SetDiscoveryFilter method. --- src/adapter.c | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) diff --git a/src/adapter.c b/src/adapter.c index 7c51399..1780ab1 100644 --- a/src/adapter.c +++ b/src/adapter.c @@ -92,6 +92,8 @@ #define SCAN_TYPE_LE ((1 << BDADDR_LE_PUBLIC) | (1 << BDADDR_LE_RANDOM)) #define SCAN_TYPE_DUAL (SCAN_TYPE_BREDR | SCAN_TYPE_LE) +#define DISTNACE_VAL_INVALID 0x7FFF + static DBusConnection *dbus_conn = NULL; static bool kernel_conn_control = false; @@ -145,6 +147,13 @@ struct conn_param { uint16_t timeout; }; +struct discovery_filter { + uint8_t type; + uint16_t pathloss; + int16_t rssi; + GSList *uuids; +}; + struct watch_client { struct btd_adapter *adapter; char *owner; @@ -1760,9 +1769,172 @@ static DBusMessage *start_discovery(DBusConnection *conn, return dbus_message_new_method_return(msg); } +static bool parse_discovery_filter_entry(char *key, DBusMessageIter *value, + GSList **uuids, int16_t *rssi, + uint16_t *pathloss, uint8_t *transport) +{ + uint8_t type; + + if (strcmp("UUIDs", key) == 0) { + DBusMessageIter arriter; + + if (dbus_message_iter_get_arg_type(value) != DBUS_TYPE_ARRAY) + return false; + dbus_message_iter_recurse(value, &arriter); + while ((type = dbus_message_iter_get_arg_type(&arriter)) != + DBUS_TYPE_INVALID) { + char *uuid_str; + char *result_uuid; + uuid_t uuid_tmp; + + if (dbus_message_iter_get_arg_type(&arriter) != + DBUS_TYPE_STRING) + return false; + + dbus_message_iter_get_basic(&arriter, &uuid_str); + if (bt_string2uuid(&uuid_tmp, uuid_str) < 0) + return false; + + result_uuid = bt_uuid2string(&uuid_tmp); + + *uuids = g_slist_prepend(*uuids, result_uuid); + + dbus_message_iter_next(&arriter); + } + } else if (strcmp("RSSI", key) == 0) { + if (dbus_message_iter_get_arg_type(value) != DBUS_TYPE_INT16) + return false; + dbus_message_iter_get_basic(value, rssi); + if (*rssi > 0 || *rssi < -127) + return false; + } else if (strcmp("Pathloss", key) == 0) { + if (dbus_message_iter_get_arg_type(value) != DBUS_TYPE_UINT16) + return false; + dbus_message_iter_get_basic(value, pathloss); + if (*pathloss > 127) + return false; + } else if (strcmp("Transport", key) == 0) { + char *transport_str; + + if (dbus_message_iter_get_arg_type(value) != DBUS_TYPE_STRING) + return false; + dbus_message_iter_get_basic(value, &transport_str); + + if (strcmp(transport_str, "bredr") == 0) + *transport = SCAN_TYPE_BREDR; + else if (strcmp(transport_str, "le") == 0) + *transport = SCAN_TYPE_LE; + else if (strcmp(transport_str, "auto") == 0) + *transport = SCAN_TYPE_DUAL; + else + return false; + } else { + DBG("Unknown key parameter: %s!\n", key); + return false; + } + + return true; +} + +/* This method is responsible for parsing parameters to SetDiscoveryFilter. If + * filter in msg was empty, sets *filter to NULL. If whole parsing was + * successful, sets *filter to proper value. + * Returns false on any error, and true on success. + */ +static bool parse_discovery_filter_dict(struct discovery_filter **filter, + DBusMessage *msg) +{ + DBusMessageIter iter, subiter, dictiter, variantiter; + GSList *uuids = NULL; + uint16_t pathloss = DISTNACE_VAL_INVALID; + int16_t rssi = DISTNACE_VAL_INVALID; + uint8_t transport = SCAN_TYPE_DUAL; + uint8_t is_empty = true; + + dbus_message_iter_init(msg, &iter); + if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY || + dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_DICT_ENTRY) + return false; + + dbus_message_iter_recurse(&iter, &subiter); + do { + int type = dbus_message_iter_get_arg_type(&subiter); + + if (type == DBUS_TYPE_INVALID) + break; + + if (type == DBUS_TYPE_DICT_ENTRY) { + char *key; + + is_empty = false; + dbus_message_iter_recurse(&subiter, &dictiter); + + dbus_message_iter_get_basic(&dictiter, &key); + if (!dbus_message_iter_next(&dictiter)) + goto invalid_args; + + if (dbus_message_iter_get_arg_type(&dictiter) != + DBUS_TYPE_VARIANT) + goto invalid_args; + + dbus_message_iter_recurse(&dictiter, &variantiter); + + if (!parse_discovery_filter_entry(key, &variantiter, + &uuids, &rssi, &pathloss, + &transport)) + goto invalid_args; + } + + dbus_message_iter_next(&subiter); + } while (true); + + if (is_empty) { + *filter = NULL; + return true; + } + + /* only pathlos or rssi can be set, never both*/ + if (pathloss != DISTNACE_VAL_INVALID && rssi != DISTNACE_VAL_INVALID) + goto invalid_args; + + DBG("filtered discovery params: transport: %d rssi: %d pathloss: %d", + transport, rssi, pathloss); + + *filter = g_try_malloc(sizeof(*filter)); + if (*filter == NULL) { + g_slist_free_full(uuids, g_free); + return false; + } + + (*filter)->type = transport; + (*filter)->pathloss = pathloss; + (*filter)->rssi = rssi; + (*filter)->uuids = uuids; + + return true; + +invalid_args: + g_slist_free_full(uuids, g_free); + return false; +} + static DBusMessage *set_discovery_filter(DBusConnection *conn, DBusMessage *msg, void *user_data) { + struct btd_adapter *adapter = user_data; + struct discovery_filter *discovery_filter; + + const char *sender = dbus_message_get_sender(msg); + + DBG("sender %s", sender); + + if (!(adapter->current_settings & MGMT_SETTING_POWERED)) + return btd_error_not_ready(msg); + + /* parse parameters */ + if (!parse_discovery_filter_dict(&discovery_filter, msg)) + return btd_error_invalid_args(msg); + return btd_error_failed(msg, "Not implemented yet"); } -- 2.2.0.rc0.207.ga3a616c