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[107.146.107.67]) by smtp.gmail.com with ESMTPSA id s18-20020ab07652000000b007e700502549sm136364uaq.2.2024.04.08.08.59.49 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Apr 2024 08:59:50 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH BlueZ v1] shared/gatt-db: Fix gatt_db_service_insert_characteristic Date: Mon, 8 Apr 2024 11:59:49 -0400 Message-ID: <20240408155949.3622429-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Luiz Augusto von Dentz gatt_db_service_insert_characteristic shall not attempt to insert the characteristic attribute handle on the next available index as there could be descriptors in between so this changes the way get_attribute_index calculates the index based on the given handle to properly skip indexes used by descriptors. --- monitor/att.c | 7 +-- src/gatt-database.c | 7 +-- src/settings.c | 3 +- src/shared/gatt-client.c | 3 ++ src/shared/gatt-db.c | 101 +++++++++++++++++++++++---------------- src/shared/gatt-db.h | 2 + unit/test-gatt.c | 1 + 7 files changed, 76 insertions(+), 48 deletions(-) diff --git a/monitor/att.c b/monitor/att.c index 3e5d7f12d182..b3fb3ba6a0ad 100644 --- a/monitor/att.c +++ b/monitor/att.c @@ -506,6 +506,7 @@ static struct gatt_db *get_db(const struct l2cap_frame *frame, bool rsp) static struct gatt_db_attribute *insert_chrc(const struct l2cap_frame *frame, uint16_t handle, + uint16_t value_handle, bt_uuid_t *uuid, uint8_t prop, bool rsp) { @@ -515,8 +516,8 @@ static struct gatt_db_attribute *insert_chrc(const struct l2cap_frame *frame, if (!db) return NULL; - return gatt_db_insert_characteristic(db, handle, uuid, 0, prop, NULL, - NULL, NULL); + return gatt_db_insert_characteristic(db, handle, value_handle, uuid, 0, + prop, NULL, NULL, NULL); } static int bt_uuid_from_data(bt_uuid_t *uuid, const void *data, uint16_t size) @@ -615,7 +616,7 @@ static void print_chrc(const struct l2cap_frame *frame) print_uuid(" Value UUID", frame->data, frame->size); bt_uuid_from_data(&uuid, frame->data, frame->size); - insert_chrc(frame, handle, &uuid, prop, true); + insert_chrc(frame, handle - 1, handle, &uuid, prop, true); } static void chrc_read(const struct l2cap_frame *frame) diff --git a/src/gatt-database.c b/src/gatt-database.c index 7221ffc87f0d..6c11027a79ed 100644 --- a/src/gatt-database.c +++ b/src/gatt-database.c @@ -3352,9 +3352,10 @@ static bool database_add_chrc(struct external_service *service, } chrc->attrib = gatt_db_service_insert_characteristic(service->attrib, - handle, &uuid, chrc->perm, - chrc->props, chrc_read_cb, - chrc_write_cb, chrc); + handle - 1, handle, &uuid, + chrc->perm, chrc->props, + chrc_read_cb, chrc_write_cb, + chrc); if (!chrc->attrib) { error("Failed to create characteristic entry in database"); return false; diff --git a/src/settings.c b/src/settings.c index 85534f2c7aca..033e9670ac40 100644 --- a/src/settings.c +++ b/src/settings.c @@ -125,7 +125,8 @@ static int load_chrc(struct gatt_db *db, char *handle, char *value, handle_int, value_handle, properties, val_len ? val_str : "", uuid_str); - att = gatt_db_service_insert_characteristic(service, value_handle, + att = gatt_db_service_insert_characteristic(service, handle_int, + value_handle, &uuid, 0, properties, NULL, NULL, NULL); if (!att || gatt_db_attribute_get_handle(att) != value_handle) diff --git a/src/shared/gatt-client.c b/src/shared/gatt-client.c index 6340bcd8508e..dcf6f0211a67 100644 --- a/src/shared/gatt-client.c +++ b/src/shared/gatt-client.c @@ -735,6 +735,7 @@ static bool discover_descs(struct discovery_op *op, bool *discovering) } attr = gatt_db_insert_characteristic(client->db, + chrc_data->start_handle, chrc_data->value_handle, &chrc_data->uuid, 0, chrc_data->properties, @@ -829,6 +830,8 @@ done: return true; failed: + DBG(client, "Failed to discover descriptors"); + free(chrc_data); return false; } diff --git a/src/shared/gatt-db.c b/src/shared/gatt-db.c index 9559583d11a7..2c8e7d31eda1 100644 --- a/src/shared/gatt-db.c +++ b/src/shared/gatt-db.c @@ -825,28 +825,45 @@ bool gatt_db_set_authorize(struct gatt_db *db, gatt_db_authorize_cb_t cb, return true; } -static uint16_t get_attribute_index(struct gatt_db_service *service, +static uint16_t service_get_attribute_index(struct gatt_db_service *service, + uint16_t *handle, int end_offset) { int i = 0; - /* Here we look for first free attribute index with given offset */ - while (i < (service->num_handles - end_offset) && + if (!service || !service->attributes[0] || !handle) + return 0; + + if (*handle) { + /* Check if handle is in within service range */ + if (*handle < service->attributes[0]->handle) + return 0; + + /* Return index based on given handle */ + i = *handle - service->attributes[0]->handle; + } else { + /* Here we look for first free attribute index with given + * offset. + */ + while (i < (service->num_handles - end_offset) && service->attributes[i]) - i++; + i++; + } - return i == (service->num_handles - end_offset) ? 0 : i; -} + if (i >= (service->num_handles - end_offset)) + return 0; -static uint16_t get_handle_at_index(struct gatt_db_service *service, - int index) -{ - return service->attributes[index]->handle; + /* Set handle based on the index */ + if (!(*handle)) + *handle = service->attributes[0]->handle + i; + + return i; } static struct gatt_db_attribute * service_insert_characteristic(struct gatt_db_service *service, uint16_t handle, + uint16_t value_handle, const bt_uuid_t *uuid, uint32_t permissions, uint8_t properties, @@ -854,6 +871,7 @@ service_insert_characteristic(struct gatt_db_service *service, gatt_db_write_t write_func, void *user_data) { + struct gatt_db_attribute **chrc; uint8_t value[MAX_CHAR_DECL_VALUE_LEN]; uint16_t len = 0; int i; @@ -874,37 +892,48 @@ service_insert_characteristic(struct gatt_db_service *service, if (handle == UINT16_MAX) return NULL; - i = get_attribute_index(service, 1); + i = service_get_attribute_index(service, &handle, 1); if (!i) return NULL; - if (!handle) - handle = get_handle_at_index(service, i - 1) + 2; - value[0] = properties; len += sizeof(properties); /* We set handle of characteristic value, which will be added next */ - put_le16(handle, &value[1]); + put_le16(value_handle, &value[1]); len += sizeof(uint16_t); len += uuid_to_le(uuid, &value[3]); - service->attributes[i] = new_attribute(service, handle - 1, + service->attributes[i] = new_attribute(service, handle, &characteristic_uuid, value, len); if (!service->attributes[i]) return NULL; - set_attribute_data(service->attributes[i], NULL, NULL, BT_ATT_PERM_READ, NULL); + chrc = &service->attributes[i]; + set_attribute_data(service->attributes[i], NULL, NULL, BT_ATT_PERM_READ, + NULL); - i++; - - service->attributes[i] = new_attribute(service, handle, uuid, NULL, 0); - if (!service->attributes[i]) { - free(service->attributes[i - 1]); + i = service_get_attribute_index(service, &value_handle, 0); + if (!i) { + free(*chrc); + *chrc = NULL; return NULL; } + service->attributes[i] = new_attribute(service, value_handle, uuid, + NULL, 0); + if (!service->attributes[i]) { + free(*chrc); + *chrc = NULL; + return NULL; + } + + /* Update handle of characteristic value_handle if it has changed */ + put_le16(value_handle, &value[1]); + if (memcmp((*chrc)->value, value, len)) + memcpy((*chrc)->value, value, len); + set_attribute_data(service->attributes[i], read_func, write_func, permissions, user_data); @@ -914,6 +943,7 @@ service_insert_characteristic(struct gatt_db_service *service, struct gatt_db_attribute * gatt_db_insert_characteristic(struct gatt_db *db, uint16_t handle, + uint16_t value_handle, const bt_uuid_t *uuid, uint32_t permissions, uint8_t properties, @@ -927,7 +957,8 @@ gatt_db_insert_characteristic(struct gatt_db *db, if (!attrib) return NULL; - return service_insert_characteristic(attrib->service, handle, uuid, + return service_insert_characteristic(attrib->service, handle, + value_handle, uuid, permissions, properties, read_func, write_func, user_data); @@ -936,6 +967,7 @@ gatt_db_insert_characteristic(struct gatt_db *db, struct gatt_db_attribute * gatt_db_service_insert_characteristic(struct gatt_db_attribute *attrib, uint16_t handle, + uint16_t value_handle, const bt_uuid_t *uuid, uint32_t permissions, uint8_t properties, @@ -946,7 +978,8 @@ gatt_db_service_insert_characteristic(struct gatt_db_attribute *attrib, if (!attrib) return NULL; - return service_insert_characteristic(attrib->service, handle, uuid, + return service_insert_characteristic(attrib->service, handle, + value_handle, uuid, permissions, properties, read_func, write_func, user_data); @@ -964,7 +997,7 @@ gatt_db_service_add_characteristic(struct gatt_db_attribute *attrib, if (!attrib) return NULL; - return service_insert_characteristic(attrib->service, 0, uuid, + return service_insert_characteristic(attrib->service, 0, 0, uuid, permissions, properties, read_func, write_func, user_data); @@ -981,17 +1014,10 @@ service_insert_descriptor(struct gatt_db_service *service, { int i; - i = get_attribute_index(service, 0); + i = service_get_attribute_index(service, &handle, 0); if (!i) return NULL; - /* Check if handle is in within service range */ - if (handle && handle <= service->attributes[0]->handle) - return NULL; - - if (!handle) - handle = get_handle_at_index(service, i - 1) + 1; - service->attributes[i] = new_attribute(service, handle, uuid, NULL, 0); if (!service->attributes[i]) return NULL; @@ -1151,17 +1177,10 @@ service_insert_included(struct gatt_db_service *service, uint16_t handle, len += include->value_len; } - index = get_attribute_index(service, 0); + index = service_get_attribute_index(service, &handle, 0); if (!index) return NULL; - /* Check if handle is in within service range */ - if (handle && handle <= service->attributes[0]->handle) - return NULL; - - if (!handle) - handle = get_handle_at_index(service, index - 1) + 1; - service->attributes[index] = new_attribute(service, handle, &included_service_uuid, value, len); diff --git a/src/shared/gatt-db.h b/src/shared/gatt-db.h index fb939e40d40e..f7596e33529a 100644 --- a/src/shared/gatt-db.h +++ b/src/shared/gatt-db.h @@ -63,6 +63,7 @@ gatt_db_service_add_characteristic(struct gatt_db_attribute *attrib, struct gatt_db_attribute * gatt_db_service_insert_characteristic(struct gatt_db_attribute *attrib, uint16_t handle, + uint16_t value_handle, const bt_uuid_t *uuid, uint32_t permissions, uint8_t properties, @@ -73,6 +74,7 @@ gatt_db_service_insert_characteristic(struct gatt_db_attribute *attrib, struct gatt_db_attribute * gatt_db_insert_characteristic(struct gatt_db *db, uint16_t handle, + uint16_t value_handle, const bt_uuid_t *uuid, uint32_t permissions, uint8_t properties, diff --git a/unit/test-gatt.c b/unit/test-gatt.c index 5e06d4ed4bf9..1613fbcb5f21 100644 --- a/unit/test-gatt.c +++ b/unit/test-gatt.c @@ -1237,6 +1237,7 @@ add_char_with_value(struct gatt_db_attribute *service_att, uint16_t handle, if (handle) attrib = gatt_db_service_insert_characteristic(service_att, + handle - 1, handle, uuid, att_permissions, char_properties,