static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){
if (packet_type != ATT_DATA_PACKET) return;
// handle value indication confirms
if (packet[0] == ATT_HANDLE_VALUE_CONFIRMATION && att_handle_value_indication_handle){
run_loop_remove_timer(&att_handle_value_indication_timer);
uint16_t att_handle = att_handle_value_indication_handle;
att_handle_value_indication_handle = 0;
att_handle_value_indication_notify_client(0, att_connection.con_handle, att_handle);
return;
}
// check size
if (size > sizeof(att_request_buffer)) return;
// last request still in processing?
if (att_server_state != ATT_SERVER_IDLE) return;
// store request
att_server_state = ATT_SERVER_REQUEST_RECEIVED;
att_request_size = size;
memcpy(att_request_buffer, packet, size);
att_run();
}
static void att_signed_write_handle_cmac_result(uint8_t hash[8]){
if (att_server_state != ATT_SERVER_W4_SIGNED_WRITE_VALIDATION) return;
if (memcmp(hash, &att_request_buffer[att_request_size-8], 8)){
log_info("ATT Signed Write, invalid signature");
att_server_state = ATT_SERVER_IDLE;
return;
}
// update sequence number
uint32_t counter_packet = READ_BT_32(att_request_buffer, att_request_size-12);
le_device_db_remote_counter_set(att_ir_le_device_db_index, counter_packet+1);
att_server_state = ATT_SERVER_REQUEST_RECEIVED_AND_VALIDATED;
att_run();
}
static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){
if (packet_type != ATT_DATA_PACKET) return;
// handle value indication confirms
if (packet[0] == ATT_HANDLE_VALUE_CONFIRMATION && att_handle_value_indication_handle){
run_loop_remove_timer(&att_handle_value_indication_timer);
uint16_t att_handle = att_handle_value_indication_handle;
att_handle_value_indication_handle = 0;
att_handle_value_indication_notify_client(0, att_connection.con_handle, att_handle);
return;
}
// directly process commands
// note: signed write cannot be handled directly as authentication needs to be verified
if (packet[0] == ATT_WRITE_COMMAND){
att_handle_request(&att_connection, packet, size, 0);
return;
}
// check size
if (size > sizeof(att_request_buffer)) {
log_info("att_packet_handler: dropping att pdu 0x%02x as size %u > att_request_buffer %u", packet[0], size, (int) sizeof(att_request_buffer));
return;
}
// last request still in processing?
if (att_server_state != ATT_SERVER_IDLE){
log_info("att_packet_handler: skipping att pdu 0x%02x as server not idle (state %u)", packet[0], att_server_state);
return;
}
// store request
att_server_state = ATT_SERVER_REQUEST_RECEIVED;
att_request_size = size;
memcpy(att_request_buffer, packet, size);
att_run();
}
static void att_event_packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
switch (packet_type) {
case HCI_EVENT_PACKET:
switch (packet[0]) {
case DAEMON_EVENT_HCI_PACKET_SENT:
att_run();
break;
case HCI_EVENT_LE_META:
switch (packet[2]) {
case HCI_SUBEVENT_LE_CONNECTION_COMPLETE:
// store connection info
att_client_addr_type = packet[7];
bt_flip_addr(att_client_address, &packet[8]);
// reset connection properties
att_connection.con_handle = READ_BT_16(packet, 4);
att_connection.mtu = ATT_DEFAULT_MTU;
att_connection.max_mtu = l2cap_max_le_mtu();
att_connection.encryption_key_size = 0;
att_connection.authenticated = 0;
att_connection.authorized = 0;
break;
default:
break;
}
break;
case HCI_EVENT_ENCRYPTION_CHANGE:
// check handle
if (att_connection.con_handle != READ_BT_16(packet, 3)) break;
att_connection.encryption_key_size = sm_encryption_key_size(att_client_addr_type, att_client_address);
att_connection.authenticated = sm_authenticated(att_client_addr_type, att_client_address);
break;
case HCI_EVENT_DISCONNECTION_COMPLETE:
att_clear_transaction_queue(&att_connection);
att_connection.con_handle = 0;
att_handle_value_indication_handle = 0; // reset error state
// restart advertising if we have been connected before
// -> avoid sending advertise enable a second time before command complete was received
att_server_state = ATT_SERVER_IDLE;
break;
case SM_IDENTITY_RESOLVING_STARTED:
log_info("SM_IDENTITY_RESOLVING_STARTED");
att_ir_lookup_active = 1;
break;
case SM_IDENTITY_RESOLVING_SUCCEEDED:
att_ir_lookup_active = 0;
att_ir_le_device_db_index = ((sm_event_t*) packet)->le_device_db_index;
log_info("SM_IDENTITY_RESOLVING_SUCCEEDED id %u", att_ir_le_device_db_index);
att_run();
break;
case SM_IDENTITY_RESOLVING_FAILED:
log_info("SM_IDENTITY_RESOLVING_FAILED");
att_ir_lookup_active = 0;
att_ir_le_device_db_index = -1;
att_run();
break;
case SM_AUTHORIZATION_RESULT: {
sm_event_t * event = (sm_event_t *) packet;
if (event->addr_type != att_client_addr_type) break;
if (memcmp(event->address, att_client_address, 6) != 0) break;
att_connection.authorized = event->authorization_result;
att_run();
break;
}
default:
break;
}
}
if (att_client_packet_handler){
att_client_packet_handler(packet_type, channel, packet, size);
}
}
