/* * Copyright (C) 2016 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #include #include #include #include #include #include "btstack.h" #include "avdtp.h" #include "avdtp_sink.h" static const char * default_avdtp_sink_service_name = "BTstack AVDTP Sink Service"; static const char * default_avdtp_sink_service_provider_name = "BTstack AVDTP Sink Service Provider"; static btstack_linked_list_t avdtp_sink_connections = NULL; static uint8_t transaction_label = 0; static btstack_packet_handler_t avdtp_sink_callback; static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static void avdtp_sink_run_for_connection(avdtp_sink_connection_t *connection); void a2dp_sink_create_sdp_record(uint8_t * service, uint32_t service_record_handle, uint16_t supported_features, const char * service_name, const char * service_provider_name){ uint8_t* attribute; de_create_sequence(service); // 0x0000 "Service Record Handle" de_add_number(service, DE_UINT, DE_SIZE_16, SDP_ServiceRecordHandle); de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle); // 0x0001 "Service Class ID List" de_add_number(service, DE_UINT, DE_SIZE_16, SDP_ServiceClassIDList); attribute = de_push_sequence(service); { de_add_number(attribute, DE_UUID, DE_SIZE_16, AUDIO_SINK_GROUP); } de_pop_sequence(service, attribute); // 0x0004 "Protocol Descriptor List" de_add_number(service, DE_UINT, DE_SIZE_16, SDP_ProtocolDescriptorList); attribute = de_push_sequence(service); { uint8_t* l2cpProtocol = de_push_sequence(attribute); { de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, SDP_L2CAPProtocol); de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, PSM_AVDTP); } de_pop_sequence(attribute, l2cpProtocol); uint8_t* avProtocol = de_push_sequence(attribute); { de_add_number(avProtocol, DE_UUID, DE_SIZE_16, PSM_AVDTP); // avProtocol_service de_add_number(avProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version } de_pop_sequence(attribute, avProtocol); } de_pop_sequence(service, attribute); // 0x0005 "Public Browse Group" de_add_number(service, DE_UINT, DE_SIZE_16, SDP_BrowseGroupList); // public browse group attribute = de_push_sequence(service); { de_add_number(attribute, DE_UUID, DE_SIZE_16, SDP_PublicBrowseGroup); } de_pop_sequence(service, attribute); // 0x0009 "Bluetooth Profile Descriptor List" de_add_number(service, DE_UINT, DE_SIZE_16, SDP_BluetoothProfileDescriptorList); attribute = de_push_sequence(service); { uint8_t *a2dProfile = de_push_sequence(attribute); { de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, ADVANCED_AUDIO_DISTRIBUTION); de_add_number(a2dProfile, DE_UINT, DE_SIZE_16, 0x0103); } de_pop_sequence(attribute, a2dProfile); } de_pop_sequence(service, attribute); // 0x0100 "Service Name" de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100); if (service_name){ de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name); } else { de_add_data(service, DE_STRING, strlen(default_avdtp_sink_service_name), (uint8_t *) default_avdtp_sink_service_name); } // 0x0100 "Provider Name" de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102); if (service_provider_name){ de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name); } else { de_add_data(service, DE_STRING, strlen(default_avdtp_sink_service_provider_name), (uint8_t *) default_avdtp_sink_service_provider_name); } // 0x0311 "Supported Features" de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311); de_add_number(service, DE_UINT, DE_SIZE_16, supported_features); } static avdtp_sink_connection_t * create_avdtp_sink_connection_context(bd_addr_t bd_addr){ avdtp_sink_connection_t * avdtp_connection = btstack_memory_avdtp_sink_connection_get(); if (!avdtp_connection) return NULL; memset(avdtp_connection,0, sizeof(avdtp_sink_connection_t)); memcpy(avdtp_connection->remote_addr, bd_addr, 6); avdtp_connection->state = AVDTP_SINK_IDLE; btstack_linked_list_add(&avdtp_sink_connections, (btstack_linked_item_t*)avdtp_connection); return avdtp_connection; } static avdtp_sink_connection_t * get_avdtp_sink_connection_context_for_bd_addr(bd_addr_t bd_addr){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &avdtp_sink_connections); while (btstack_linked_list_iterator_has_next(&it)){ avdtp_sink_connection_t * connection = (avdtp_sink_connection_t *)btstack_linked_list_iterator_next(&it); if (memcmp(connection->remote_addr, bd_addr, 6) == 0) { return connection; } } return NULL; } static avdtp_sink_connection_t * get_avdtp_sink_connection_context_for_l2cap_cid(uint16_t l2cap_cid){ btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, (btstack_linked_list_t *) &avdtp_sink_connections); while (btstack_linked_list_iterator_has_next(&it)){ avdtp_sink_connection_t * connection = (avdtp_sink_connection_t *)btstack_linked_list_iterator_next(&it); if (connection->l2cap_cid == l2cap_cid){ return connection; } } return NULL; } static void avdtp_sink_remove_connection_context(avdtp_sink_connection_t * connection){ btstack_linked_list_remove(&avdtp_sink_connections, (btstack_linked_item_t*) connection); } static inline uint8_t avdtp_header(uint8_t tr_label, avdtp_packet_type_t packet_type, avdtp_message_type_t msg_type){ return (tr_label<<4) | ((uint8_t)packet_type<<2) | (uint8_t)msg_type; } static int avdtp_sink_send_discover_cmd(uint16_t cid){ uint8_t command[2]; command[0] = avdtp_header(transaction_label, AVDTP_SINGLE_PACKET, AVDTP_CMD_MSG); command[1] = (uint8_t)AVDTP_DISCOVER; return l2cap_send(cid, command, sizeof(command)); } static int avdtp_sink_send_get_capabilities_cmd(uint16_t cid, uint8_t sep_id){ return 0; } static void handle_l2cap_data_packet(avdtp_sink_connection_t * connection, uint8_t *packet, uint16_t size){ if (size < 2) { log_error("l2cap data packet too small"); return; } uint8_t tr_label = packet[0] >> 4; avdtp_packet_type_t packet_type = (avdtp_packet_type_t)((packet[0] >> 2) & 0x03); avdtp_message_type_t msg_type = (avdtp_message_type_t) (packet[0] & 0x03); uint8_t signal_identifier = packet[1] & 0x3f; printf("\nheader: tr_label %d, packet_type %d, msg_type %d, signal_identifier %02x\n", tr_label, packet_type, msg_type, signal_identifier); int i = 2; avdtp_sep_t sep; switch (connection->state){ case AVDTP_SINK_W4_SEPS_DISCOVERED: if (tr_label != transaction_label){ log_error("unexpected transaction label, got %d, expected %d", tr_label, transaction_label); return; } if (signal_identifier != AVDTP_DISCOVER) { log_error("unexpected signal identifier ..."); return; } if (size == 3){ printf("ERROR code %02x\n", packet[2]); return; } for (i = 2; i> 2; if (sep.seid < 0x01 || sep.seid > 0x3E){ log_error("invalid sep id"); return; } sep.in_use = (packet[i] >> 1) & 0x01; sep.media_type = (avdtp_media_type_t)(packet[i+1] >> 4); sep.type = (avdtp_sep_type_t)((packet[i+1] >> 3) & 0x01); connection->remote_seps[connection->remote_seps_num++] = sep; printf("found sep: seid %u, in_use %d, media type %d, sep type %d (1-SNK)\n", sep.seid, sep.in_use, sep.media_type, sep.type); } // connection->state = AVDTP_SINK_W2_GET_CAPABILITIES; // transaction_label++; // l2cap_request_can_send_now_event(connection->l2cap_cid); break; default: printf_hexdump( packet, size ); break; } } static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ bd_addr_t event_addr; hci_con_handle_t con_handle; uint16_t psm; uint16_t remote_cid; uint16_t local_cid; avdtp_sink_connection_t * connection = NULL; switch (packet_type) { case L2CAP_DATA_PACKET: connection = get_avdtp_sink_connection_context_for_l2cap_cid(channel); if (!connection){ log_error("avdtp packet handler L2CAP_EVENT_INCOMING_CONNECTION: connection for local cid 0x%02x not found", channel); break; } handle_l2cap_data_packet(connection, packet, size); break; case HCI_EVENT_PACKET: switch (hci_event_packet_get_type(packet)) { case L2CAP_EVENT_INCOMING_CONNECTION: l2cap_event_incoming_connection_get_address(packet, event_addr); connection = get_avdtp_sink_connection_context_for_bd_addr(event_addr); if (!connection){ log_error("avdtp packet handler L2CAP_EVENT_INCOMING_CONNECTION: connection for bd address %s not found", bd_addr_to_str(event_addr)); break; } connection = create_avdtp_sink_connection_context(event_addr); if (!connection) return; con_handle = l2cap_event_incoming_connection_get_handle(packet); psm = l2cap_event_incoming_connection_get_psm(packet); local_cid = l2cap_event_incoming_connection_get_local_cid(packet); remote_cid = l2cap_event_incoming_connection_get_remote_cid(packet); printf("L2CAP_EVENT_INCOMING_CONNECTION %s, handle 0x%02x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x\n", bd_addr_to_str(event_addr), con_handle, psm, local_cid, remote_cid); connection->state = AVDTP_SINK_W4_L2CAP_CONNECTED; l2cap_accept_connection(local_cid); break; case L2CAP_EVENT_CHANNEL_OPENED: // inform about new l2cap connection l2cap_event_channel_opened_get_address(packet, event_addr); connection = get_avdtp_sink_connection_context_for_bd_addr(event_addr); if (!connection || connection->state != AVDTP_SINK_W4_L2CAP_CONNECTED) return; if (l2cap_event_channel_opened_get_status(packet)){ printf("L2CAP connection to device %s failed. status code %u\n", bd_addr_to_str(event_addr), l2cap_event_channel_opened_get_status(packet)); break; } psm = l2cap_event_channel_opened_get_psm(packet); connection->l2cap_cid = l2cap_event_channel_opened_get_local_cid(packet); connection->acl_handle = l2cap_event_channel_opened_get_handle(packet); printf("Channel successfully opened: %s, handle 0x%02x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x, context %p\n", bd_addr_to_str(event_addr), connection->acl_handle, psm, connection->l2cap_cid, l2cap_event_channel_opened_get_remote_cid(packet), connection); connection->state = AVDTP_SINK_W2_DISCOVER_SEPS; transaction_label++; l2cap_request_can_send_now_event(connection->l2cap_cid); break; case L2CAP_EVENT_CHANNEL_CLOSED: // data: event (8), len(8), channel (16) local_cid = l2cap_event_channel_closed_get_local_cid(packet); connection = get_avdtp_sink_connection_context_for_l2cap_cid(local_cid); if (!connection || connection->state != AVDTP_SINK_W4_L2CAP_DISCONNECTED) return; log_info("L2CAP_EVENT_CHANNEL_CLOSED cid 0x%0x", local_cid); avdtp_sink_remove_connection_context(connection); connection->state = AVDTP_SINK_IDLE; break; default: // other event break; } break; default: // other packet type break; } avdtp_sink_run_for_connection(connection); } // TODO: find out which security level is needed, and replace LEVEL_0 in avdtp_sink_init void avdtp_sink_init(void){ l2cap_register_service(&packet_handler, PSM_AVDTP, 0xffff, LEVEL_0); } void avdtp_sink_register_packet_handler(btstack_packet_handler_t callback){ if (callback == NULL){ log_error("avdtp_sink_register_packet_handler called with NULL callback"); return; } avdtp_sink_callback = callback; } static void avdtp_sink_run_for_connection(avdtp_sink_connection_t *connection){ if (!connection) return; // handle disconnect request if (connection->release_l2cap_connection){ if (connection->state > AVDTP_SINK_W4_L2CAP_CONNECTED || connection->state < AVDTP_SINK_W4_L2CAP_DISCONNECTED){ connection->release_l2cap_connection = 0; connection->state = AVDTP_SINK_W4_L2CAP_DISCONNECTED; l2cap_disconnect(connection->l2cap_cid, 0); return; } } if (!l2cap_can_send_packet_now(connection->l2cap_cid)) { log_info("avdtp_sink_run_for_connection: request cannot send for 0x%02x", connection->l2cap_cid); return; } switch (connection->state){ case AVDTP_SINK_W2_DISCOVER_SEPS: avdtp_sink_send_discover_cmd(connection->l2cap_cid); connection->state = AVDTP_SINK_W4_SEPS_DISCOVERED; break; case AVDTP_SINK_W2_GET_CAPABILITIES: avdtp_sink_send_get_capabilities_cmd(connection->l2cap_cid, 0); connection->state = AVDTP_SINK_W4_CAPABILITIES; break; default: break; } } void avdtp_sink_connect(bd_addr_t bd_addr){ avdtp_sink_connection_t * connection = get_avdtp_sink_connection_context_for_bd_addr(bd_addr); if (connection) { log_error("avdtp_sink_connect: connection for bd address %s not found", bd_addr_to_str(bd_addr)); return; } connection = create_avdtp_sink_connection_context(bd_addr); if (!connection){ log_error("avdtp_sink_connect: cannot create connection for bd address %s", bd_addr_to_str(bd_addr)); return; } connection->state = AVDTP_SINK_W4_L2CAP_CONNECTED; l2cap_create_channel(packet_handler, connection->remote_addr, PSM_AVDTP, 0xffff, NULL); } void avdtp_sink_disconnect(uint16_t l2cap_cid){ avdtp_sink_connection_t * connection = get_avdtp_sink_connection_context_for_l2cap_cid(l2cap_cid); if (!connection) { log_error("avdtp_sink_disconnect: Connection with l2cap_cid %d not found", l2cap_cid); return; } if (connection->state == AVDTP_SINK_IDLE) return; if (connection->state == AVDTP_SINK_W4_L2CAP_DISCONNECTED) return; connection->release_l2cap_connection = 1; avdtp_sink_run_for_connection(connection); }