Return-Path: From: Arman Uguray To: linux-bluetooth@vger.kernel.org Cc: Arman Uguray Subject: [PATCH BlueZ 04/11] shared/gatt-server: Implement "Read" request. Date: Fri, 7 Nov 2014 00:09:44 -0800 Message-Id: <1415347791-11716-5-git-send-email-armansito@chromium.org> In-Reply-To: <1415347791-11716-1-git-send-email-armansito@chromium.org> References: <1415347791-11716-1-git-send-email-armansito@chromium.org> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: This patch implements the "Read" request for the GATT server role. --- src/shared/gatt-server.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) diff --git a/src/shared/gatt-server.c b/src/shared/gatt-server.c index db002db..5cf11a4 100644 --- a/src/shared/gatt-server.c +++ b/src/shared/gatt-server.c @@ -67,6 +67,7 @@ struct bt_gatt_server { unsigned int find_info_id; unsigned int write_id; unsigned int write_cmd_id; + unsigned int read_id; struct async_read_op *pending_read_op; struct async_write_op *pending_write_op; @@ -87,6 +88,7 @@ static void bt_gatt_server_free(struct bt_gatt_server *server) bt_att_unregister(server->att, server->find_info_id); bt_att_unregister(server->att, server->write_id); bt_att_unregister(server->att, server->write_cmd_id); + bt_att_unregister(server->att, server->read_id); if (server->pending_read_op) server->pending_read_op->server = NULL; @@ -758,6 +760,108 @@ error: NULL, NULL, NULL); } +static void read_complete_cb(struct gatt_db_attribute *attr, int err, + const uint8_t *value, size_t len, + void *user_data) +{ + struct async_read_op *op = user_data; + struct bt_gatt_server *server = op->server; + uint16_t mtu; + uint16_t handle; + + if (!server) { + async_read_op_destroy(op); + return; + } + + mtu = bt_att_get_mtu(server->att); + handle = gatt_db_attribute_get_handle(attr); + + if (err) { + uint8_t pdu[4]; + uint8_t att_ecode = att_ecode_from_error(err); + + encode_error_rsp(op->opcode, handle, att_ecode, pdu); + bt_att_send(server->att, BT_ATT_OP_ERROR_RSP, pdu, 4, NULL, + NULL, NULL); + async_read_op_destroy(op); + return; + } + + /* TODO: Send Read Blob response based on the request */ + + bt_att_send(server->att, BT_ATT_OP_READ_RSP, len ? value : NULL, + MIN((unsigned) mtu - 1, len), + NULL, NULL, NULL); + async_read_op_destroy(op); +} + +static void read_cb(uint8_t opcode, const void *pdu, + uint16_t length, void *user_data) +{ + struct bt_gatt_server *server = user_data; + uint16_t mtu = bt_att_get_mtu(server->att); + uint8_t error_pdu[4]; + uint16_t handle = 0; + struct gatt_db_attribute *attr; + uint8_t ecode; + uint32_t perm; + struct async_read_op *op = NULL; + + if (length != 2) { + ecode = BT_ATT_ERROR_INVALID_PDU; + goto error; + } + + handle = get_le16(pdu); + attr = gatt_db_get_attribute(server->db, handle); + if (!attr) { + ecode = BT_ATT_ERROR_INVALID_HANDLE; + goto error; + } + + util_debug(server->debug_callback, server->debug_data, + "Read - handle: 0x%04x", handle); + + if (!gatt_db_attribute_get_permissions(attr, &perm)) { + ecode = BT_ATT_ERROR_INVALID_HANDLE; + goto error; + } + + if (perm && !(perm & BT_ATT_PERM_READ)) { + ecode = BT_ATT_ERROR_READ_NOT_PERMITTED; + goto error; + } + + if (server->pending_read_op) { + ecode = BT_ATT_ERROR_UNLIKELY; + goto error; + } + + op = new0(struct async_read_op, 1); + if (!op) { + ecode = BT_ATT_ERROR_INSUFFICIENT_RESOURCES; + goto error; + } + + op->opcode = opcode; + op->server = server; + server->pending_read_op = op; + + if (gatt_db_attribute_read(attr, 0, opcode, NULL, read_complete_cb, op)) + return; + + ecode = BT_ATT_ERROR_UNLIKELY; + +error: + if (op) + async_read_op_destroy(op); + + encode_error_rsp(opcode, handle, ecode, error_pdu); + bt_att_send(server->att, BT_ATT_OP_ERROR_RSP, error_pdu, 4, NULL, NULL, + NULL); +} + static void exchange_mtu_cb(uint8_t opcode, const void *pdu, uint16_t length, void *user_data) { @@ -836,6 +940,13 @@ static bool gatt_server_register_att_handlers(struct bt_gatt_server *server) if (!server->write_cmd_id) return false; + /* Read Request */ + server->read_id = bt_att_register(server->att, BT_ATT_OP_READ_REQ, + read_cb, + server, NULL); + if (!server->read_id) + return false; + return true; } -- 2.1.0.rc2.206.gedb03e5