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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <string>
#include "common/libs/fs/shared_fd.h"
#include "common/libs/fs/shared_select.h"
#include "common/libs/usbforward/protocol.h"
#include "host/commands/virtual_usb_manager/vadb/usb_cmd.h"
#include "host/commands/virtual_usb_manager/usbip/device.h"
#include "host/commands/virtual_usb_manager/usbip/device_pool.h"
#include "host/commands/virtual_usb_manager/usbip/messages.h"
#include "host/commands/virtual_usb_manager/usbip/vhci_instrument.h"
namespace vadb {
// VirtualADBClient is a companion class for USBForwarder, running on
// Cuttlefish. VirtualADBClient collects list of available USB devices from
// Cuttlefish and makes them available to USB/IP.
//
// Purpose of this class is to connect to USBForwarder and make access to
// remote USB devices possible with help of USB/IP protocol.
class VirtualADBClient {
public:
VirtualADBClient(usbip::DevicePool* pool, cvd::SharedFD fd, int vhci_port,
const std::string& usbip_socket_name);
virtual ~VirtualADBClient() = default;
// Query remote server; populate available USB devices.
bool PopulateRemoteDevices();
// BeforeSelect is Called right before Select() to populate interesting
// SharedFDs.
void BeforeSelect(cvd::SharedFDSet* fd_read) const;
// AfterSelect is Called right after Select() to detect and respond to changes
// on affected SharedFDs.
// Return value indicates whether this client is still valid.
bool AfterSelect(const cvd::SharedFDSet& fd_read);
private:
// Register new device in a device pool.
void RegisterDevice(const usb_forward::DeviceInfo& dev,
const std::vector<usb_forward::InterfaceInfo>& ifaces);
// Request attach remote USB device.
bool HandleAttach(uint8_t bus_id, uint8_t dev_id);
// Execute control request on remote device.
bool HandleDeviceControlRequest(uint8_t bus_id, uint8_t dev_id,
const usbip::CmdRequest& r, uint32_t deadline,
std::vector<uint8_t> data,
usbip::Device::AsyncTransferReadyCB callback);
// Execute data request on remote device.
bool HandleDeviceDataRequest(uint8_t bus_id, uint8_t dev_id, uint8_t endpoint,
bool is_host_to_device, uint32_t deadline,
std::vector<uint8_t> data,
usbip::Device::AsyncTransferReadyCB callback);
// Send new heartbeat request and arm the heartbeat timer.
bool SendHeartbeat();
// Heartbeat handler receives response to heartbeat request.
// Supplied argument indicates, whether remote server is ready to export USB
// gadget.
void HandleHeartbeat(bool is_ready);
// Heartbeat timeout detects situation where heartbeat did not receive
// matching response. This could be a direct result of device reset.
bool HandleHeartbeatTimeout();
// ExecuteCommand creates command header and executes supplied USBCommand.
// If execution was successful, command will be stored internally until
// response arrives.
bool ExecuteCommand(std::unique_ptr<USBCommand> cmd);
usbip::DevicePool* pool_;
cvd::SharedFD fd_;
cvd::SharedFD timer_;
usbip::VHCIInstrument vhci_;
bool is_remote_server_ready_ = false;
uint32_t tag_ = 0;
// Assign an 'invalid' tag as previously sent heartbeat command. This will
// prevent heartbeat timeout handler from finding a command if none was sent.
uint32_t heartbeat_tag_ = ~0;
std::map<uint32_t, std::unique_ptr<USBCommand>> commands_;
VirtualADBClient(const VirtualADBClient& other) = delete;
VirtualADBClient& operator=(const VirtualADBClient& other) = delete;
};
} // namespace vadb
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