mirror of
https://github.com/kidfromjupiter/nearby.git
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640 lines
23 KiB
C++
640 lines
23 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <exception>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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#include "absl/strings/string_view.h"
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#include "absl/time/time.h"
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#include "internal/platform/implementation/windows/wifi_direct.h"
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#include "internal/platform/wifi_utils.h"
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// Nearby connections headers
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#include "internal/platform/cancellation_flag_listener.h"
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#include "internal/platform/implementation/windows/utils.h"
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#include "internal/platform/logging.h"
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namespace nearby {
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namespace windows {
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namespace {
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// The maximum scanning times for GC to find WifiDirect GO.
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constexpr int kWifiDirectMaxScans = 2;
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// The maximum connection times to remote WifiDirect GO server socket.
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constexpr int kWifiDirectMaxConnectionRetries = 3;
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// The interval between 2 connectin attempts.
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constexpr absl::Duration kWifiDirectRetryIntervalMillis =
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absl::Milliseconds(300);
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// The connection timeout to remote WifiDirect GO server socket.
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constexpr absl::Duration kWifiDirectClientSocketConnectTimeoutMillis =
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absl::Milliseconds(10000);
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// The maximum times to check IP address.
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constexpr int kIpAddressMaxRetries = 3;
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// The time interval to check IP address.
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constexpr absl::Duration kIpAddressRetryIntervalMillis =
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absl::Milliseconds(2000);
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} // namespace
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WifiDirectMedium::~WifiDirectMedium() {
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StopWifiDirect();
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DisconnectWifiDirect();
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}
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bool WifiDirectMedium::IsInterfaceValid() const {
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HANDLE wifi_direct_handle = nullptr;
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DWORD negotiated_version = 0;
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DWORD result =
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WFDOpenHandle(WFD_API_VERSION, &negotiated_version, &wifi_direct_handle);
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if (result == ERROR_SUCCESS) {
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NEARBY_LOGS(INFO) << "WiFi can support WifiDirect";
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WFDCloseHandle(wifi_direct_handle);
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return true;
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}
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NEARBY_LOGS(ERROR) << "WiFi can't support WifiDirect";
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return false;
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}
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std::unique_ptr<api::WifiDirectSocket> WifiDirectMedium::ConnectToService(
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absl::string_view ip_address, int port,
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CancellationFlag* cancellation_flag) {
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NEARBY_LOGS(WARNING) << __func__ << " : Connect to remote service.";
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if (ip_address.empty() || port == 0) {
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NEARBY_LOGS(ERROR) << "no valid service address and port to connect: "
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<< "ip_address = " << ip_address << ", port = " << port;
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return nullptr;
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}
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std::string ipv4_address;
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if (ip_address.length() == 4) {
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ipv4_address = ipaddr_4bytes_to_dotdecimal_string(ip_address);
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} else {
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ipv4_address = std::string(ip_address);
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}
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if (!WifiUtils::ValidateIPV4(ipv4_address)) {
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NEARBY_LOGS(ERROR) << "Invalid IP address parameter.";
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return nullptr;
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}
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HostName host_name{winrt::to_hstring(ipv4_address)};
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winrt::hstring service_name{winrt::to_hstring(port)};
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// Try connecting to the service up to kWifiDirectMaxConnectionRetries,
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// because it may fail first time if DHCP procedure is not finished yet.
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for (int i = 0; i < kWifiDirectMaxConnectionRetries; i++) {
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try {
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StreamSocket socket{};
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// setup cancel listener
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if (cancellation_flag != nullptr) {
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if (cancellation_flag->Cancelled()) {
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NEARBY_LOGS(INFO) << "connect has been cancelled to service "
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<< ipv4_address << ":" << port;
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return nullptr;
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}
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connection_cancellation_listener_ =
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std::make_unique<nearby::CancellationFlagListener>(
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cancellation_flag, [socket]() {
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NEARBY_LOGS(WARNING)
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<< "connect is closed due to it is cancelled.";
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socket.Close();
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});
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}
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connection_timeout_ = scheduled_executor_.Schedule(
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[socket]() {
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NEARBY_LOGS(WARNING) << "connect is closed due to timeout.";
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socket.Close();
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},
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kWifiDirectClientSocketConnectTimeoutMillis);
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socket.ConnectAsync(host_name, service_name).get();
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if (connection_cancellation_listener_ != nullptr) {
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connection_cancellation_listener_ = nullptr;
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}
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if (connection_timeout_ != nullptr) {
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connection_timeout_->Cancel();
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connection_timeout_ = nullptr;
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}
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auto client_socket = std::make_unique<WifiDirectSocket>(socket);
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NEARBY_LOGS(INFO) << "connected to remote service " << ipv4_address << ":"
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<< port;
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return client_socket;
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} catch (...) {
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NEARBY_LOGS(ERROR) << "failed to connect remote service " << ipv4_address
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<< ":" << port << " for the " << i + 1 << " time";
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}
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if (connection_cancellation_listener_ != nullptr) {
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connection_cancellation_listener_ = nullptr;
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}
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if (connection_timeout_ != nullptr) {
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connection_timeout_->Cancel();
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connection_timeout_ = nullptr;
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}
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Sleep(kWifiDirectRetryIntervalMillis / absl::Milliseconds(1));
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}
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return nullptr;
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}
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std::unique_ptr<api::WifiDirectServerSocket>
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WifiDirectMedium::ListenForService(int port) {
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absl::MutexLock lock(&mutex_);
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// check current status
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if (IsAccepting()) {
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NEARBY_LOGS(WARNING) << "accepting connections already started on port "
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<< server_socket_ptr_->GetPort();
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return nullptr;
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}
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auto server_socket = std::make_unique<WifiDirectServerSocket>(port);
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server_socket_ptr_ = server_socket.get();
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server_socket->SetCloseNotifier([this]() {
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absl::MutexLock lock(&mutex_);
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NEARBY_LOGS(INFO) << "server socket was closed on port "
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<< server_socket_ptr_->GetPort();
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medium_status_ &= (~kMediumStatusAccepting);
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server_socket_ptr_ = nullptr;
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});
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if (server_socket->listen()) {
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medium_status_ |= kMediumStatusAccepting;
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NEARBY_LOGS(INFO) << "started to listen serive on port "
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<< server_socket_ptr_->GetPort();
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return server_socket;
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}
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NEARBY_LOGS(ERROR) << "Failed to listen service on port " << port;
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return nullptr;
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}
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bool WifiDirectMedium::StartWifiDirect(
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WifiDirectCredentials* wifi_direct_credentials) {
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absl::MutexLock lock(&mutex_);
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if (IsBeaconing()) {
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NEARBY_LOGS(WARNING) << "cannot create SoftAP again when it is running.";
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return true;
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}
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try {
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publisher_ = WiFiDirectAdvertisementPublisher();
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publisher_status_changed_token_ =
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publisher_.StatusChanged({this, &WifiDirectMedium::OnStatusChanged});
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listener_ = WiFiDirectConnectionListener();
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connection_requested_token_ = listener_.ConnectionRequested(
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{this, &WifiDirectMedium::OnConnectionRequested});
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// Normal mode: The device is highly discoverable so long as the app is in
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// the foreground.
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publisher_.Advertisement().ListenStateDiscoverability(
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WiFiDirectAdvertisementListenStateDiscoverability::Normal);
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// Enable Autonomous GO mode
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publisher_.Advertisement().IsAutonomousGroupOwnerEnabled(true);
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// Using WIFIDirect legacy mode to create a softAP. AP means "access point".
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// Windows WinRT WifiDirect class follows a full P2P protocol to establish a
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// P2P connection. However the current Phone Nearby Connection uses a
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// simplified protocol for P2P connection, which is just like a legacy
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// AP/STA SSID/password mode. To accommodate with this, Windows side give up
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// the formal P2P connection code suite, instead it uses Hotspot and legacy
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// STA to fake a P2P connection. By this way, when Phone act as Group
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// Client(GC), it can keep the connection with Router(AP) at the same time.
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// But if phone act as Group Owner(GO), Windows side still can't keep its AP
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// connection when connecting to phone as a GC because it is in normal STA
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// mode.
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Prng prng;
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publisher_.Advertisement().LegacySettings().IsEnabled(true);
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std::string password = absl::StrFormat("%08x", prng.NextUint32());
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wifi_direct_credentials->SetPassword(password);
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PasswordCredential creds;
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creds.Password(winrt::to_hstring(password));
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publisher_.Advertisement().LegacySettings().Passphrase(creds);
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std::string ssid = "DIRECT-" + std::to_string(prng.NextUint32());
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wifi_direct_credentials->SetSSID(ssid);
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publisher_.Advertisement().LegacySettings().Ssid(winrt::to_hstring(ssid));
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publisher_.Start();
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if (publisher_.Status() ==
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WiFiDirectAdvertisementPublisherStatus::Started) {
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NEARBY_LOGS(INFO) << "Windows WiFiDirect GO(SoftAP) started";
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medium_status_ |= kMediumStatusBeaconing;
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return true;
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}
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// Clean up when fail
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NEARBY_LOGS(ERROR) << "Windows WiFiDirect GO(SoftAP) fails to start";
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publisher_.StatusChanged(publisher_status_changed_token_);
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listener_.ConnectionRequested(connection_requested_token_);
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listener_ = nullptr;
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publisher_ = nullptr;
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return false;
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} catch (std::exception exception) {
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NEARBY_LOGS(ERROR) << __func__
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<< ": Cannot start WiFiDirect GO. Exception: "
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<< exception.what();
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} catch (const winrt::hresult_error& error) {
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NEARBY_LOGS(ERROR) << __func__
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<< ": Cannot start WiFiDirect GO. WinRT exception: "
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<< error.code() << ": "
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<< winrt::to_string(error.message());
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} catch (...) {
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NEARBY_LOGS(ERROR) << __func__ << ": Unknown exception.";
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}
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return false;
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}
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bool WifiDirectMedium::StopWifiDirect() {
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// Need to use Win32 API to deregister the Dnssd instance
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absl::MutexLock lock(&mutex_);
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if (!IsBeaconing()) {
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NEARBY_LOGS(WARNING)
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<< "Cannot stop WiFiDirect GO(SoftAP) because no GO was started.";
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return true;
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}
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try {
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if (publisher_) {
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publisher_.Stop();
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listener_.ConnectionRequested(connection_requested_token_);
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publisher_.StatusChanged(publisher_status_changed_token_);
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wifi_direct_device_ = nullptr;
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listener_ = nullptr;
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publisher_ = nullptr;
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NEARBY_LOGS(INFO) << "succeeded to stop WiFiDirect GO(SoftAP)";
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}
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medium_status_ &= (~kMediumStatusBeaconing);
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return true;
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} catch (std::exception exception) {
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NEARBY_LOGS(ERROR) << __func__ << ": Stop WiFiDirect GO failed. Exception: "
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<< exception.what();
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} catch (const winrt::hresult_error& error) {
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NEARBY_LOGS(ERROR) << __func__
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<< ": Stop WiFiDirect GO failed. WinRT exception: "
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<< error.code() << ": "
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<< winrt::to_string(error.message());
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} catch (...) {
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NEARBY_LOGS(ERROR) << __func__ << ": Unknown exception.";
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}
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return false;
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}
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fire_and_forget WifiDirectMedium::OnStatusChanged(
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WiFiDirectAdvertisementPublisher sender,
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WiFiDirectAdvertisementPublisherStatusChangedEventArgs event) {
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if (event.Status() == WiFiDirectAdvertisementPublisherStatus::Started) {
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if (sender.Advertisement().LegacySettings().IsEnabled()) {
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NEARBY_LOGS(INFO)
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<< "WiFiDirect GO SSID: "
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<< winrt::to_string(
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publisher_.Advertisement().LegacySettings().Ssid());
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NEARBY_LOGS(INFO) << "WiFiDirect GO PW: "
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<< winrt::to_string(publisher_.Advertisement()
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.LegacySettings()
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.Passphrase()
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.Password());
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}
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return winrt::fire_and_forget();
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} else if (event.Status() ==
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WiFiDirectAdvertisementPublisherStatus::Created) {
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NEARBY_LOGS(INFO) << "Receive WiFiDirect/SoftAP Created event.";
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return winrt::fire_and_forget();
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} else if (event.Status() ==
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WiFiDirectAdvertisementPublisherStatus::Stopped) {
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NEARBY_LOGS(INFO) << "Receive WiFiDirect/SoftAP Stopped event.";
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} else if (event.Status() ==
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WiFiDirectAdvertisementPublisherStatus::Aborted) {
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NEARBY_LOGS(INFO) << "Receive WiFiDirect/SoftAP Aborted event.";
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}
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// Publisher is stopped. Need to clean up the publisher.
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{
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absl::MutexLock lock(&mutex_);
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if (publisher_ != nullptr) {
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NEARBY_LOGS(ERROR) << "Windows WiFiDirect GO(SoftAP) cleanup.";
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listener_.ConnectionRequested(connection_requested_token_);
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publisher_.StatusChanged(publisher_status_changed_token_);
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wifi_direct_device_ = nullptr;
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listener_ = nullptr;
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publisher_ = nullptr;
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}
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}
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return winrt::fire_and_forget();
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}
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fire_and_forget WifiDirectMedium::OnConnectionRequested(
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WiFiDirectConnectionListener const& sender,
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WiFiDirectConnectionRequestedEventArgs const& event) {
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WiFiDirectConnectionRequest connection_request = event.GetConnectionRequest();
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winrt::hstring device_name = connection_request.DeviceInformation().Name();
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NEARBY_LOGS(INFO) << "Receive connection request from: "
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<< winrt::to_string(device_name);
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try {
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// This is to solve b/236805122.
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// Problem: [Microsoft-Windows-WLAN-AutoConfig] issues a disconnection to
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// WifiDirect Client every 2 minutes and stopped WifiDirect GO eventually.
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// Solution: Creating a WiFiDirectDevice for Client’s connection request can
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// solve the problem. Guess when this object is created,
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// [Microsoft-Windows-WLAN-AutoConfig] will recognise it as a valid device
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// and won't kick it away.
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wifi_direct_device_ = WiFiDirectDevice::FromIdAsync(
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connection_request.DeviceInformation().Id())
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.get();
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NEARBY_LOGS(INFO) << "Registered the device in WLAN-AutoConfig";
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} catch (...) {
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NEARBY_LOGS(ERROR) << "Failed to registered the device in WLAN-AutoConfig";
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wifi_direct_device_ = nullptr;
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connection_request.Close();
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}
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return winrt::fire_and_forget();
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}
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bool WifiDirectMedium::ConnectWifiDirect(
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WifiDirectCredentials* wifi_direct_credentials) {
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absl::MutexLock lock(&mutex_);
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try {
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if (IsConnected()) {
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NEARBY_LOGS(WARNING) << "Already connected to AP, disconnect first.";
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InternalDisconnectWifiDirect();
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}
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auto access = WiFiAdapter::RequestAccessAsync().get();
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if (access != WiFiAccessStatus::Allowed) {
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NEARBY_LOGS(WARNING) << "Access Denied with reason: "
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<< static_cast<int>(access);
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return false;
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}
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auto adapters = WiFiAdapter::FindAllAdaptersAsync().get();
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if (adapters.Size() < 1) {
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NEARBY_LOGS(WARNING) << "No WiFi Adapter found.";
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return false;
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}
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wifi_adapter_ = adapters.GetAt(0);
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// Retrieve the current connected network's profile
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ConnectionProfile profile =
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wifi_adapter_.NetworkAdapter().GetConnectedProfileAsync().get();
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std::string ssid;
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if (profile != nullptr && profile.IsWlanConnectionProfile()) {
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ssid = winrt::to_string(
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profile.WlanConnectionProfileDetails().GetConnectedSsid());
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}
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// SoftAP is an abbreviation for "software enabled access point".
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WiFiAvailableNetwork nearby_softap{nullptr};
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NEARBY_LOGS(INFO) << "Scanning for Nearby WifiDirect GO's SSID: "
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<< wifi_direct_credentials->GetSSID();
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// First time scan may not find our target GO, try 2 more times can
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// almost guarantee to find the GO
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wifi_adapter_.ScanAsync().get();
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wifi_connected_network_ = nullptr;
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for (int i = 0; i < kWifiDirectMaxScans; i++) {
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for (const auto& network :
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wifi_adapter_.NetworkReport().AvailableNetworks()) {
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if (!wifi_connected_network_ && !ssid.empty() &&
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(winrt::to_string(network.Ssid()) == ssid)) {
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wifi_connected_network_ = network;
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NEARBY_LOGS(INFO) << "Save the current connected network: " << ssid;
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} else if (!nearby_softap && winrt::to_string(network.Ssid()) ==
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wifi_direct_credentials->GetSSID()) {
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NEARBY_LOGS(INFO)
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<< "Found Nearby SSID: " << winrt::to_string(network.Ssid());
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nearby_softap = network;
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}
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if (nearby_softap && wifi_connected_network_) break;
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}
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if (nearby_softap) break;
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NEARBY_LOGS(INFO) << "Scan ... ";
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wifi_adapter_.ScanAsync().get();
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}
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if (!nearby_softap) {
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NEARBY_LOGS(INFO) << "WifiDirect GO is not found";
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return false;
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}
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PasswordCredential creds;
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creds.Password(winrt::to_hstring(wifi_direct_credentials->GetPassword()));
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auto connect_result =
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wifi_adapter_
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.ConnectAsync(nearby_softap, WiFiReconnectionKind::Manual, creds)
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.get();
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if (connect_result == nullptr ||
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connect_result.ConnectionStatus() != WiFiConnectionStatus::Success) {
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NEARBY_LOGS(INFO) << "Connecting failed with reason: "
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<< static_cast<int>(connect_result.ConnectionStatus());
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return false;
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}
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// Make sure IP address is ready.
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std::string ip_address;
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for (int i = 0; i < kIpAddressMaxRetries; i++) {
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NEARBY_LOGS(INFO) << "Check IP address at attempt " << i;
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std::vector<std::string> ip_addresses = GetIpv4Addresses();
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if (ip_addresses.empty()) {
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Sleep(kIpAddressRetryIntervalMillis / absl::Milliseconds(1));
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continue;
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}
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ip_address = ip_addresses[0];
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break;
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}
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if (ip_address.empty()) {
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NEARBY_LOGS(INFO) << "Failed to get IP address from WifiDirect GO.";
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return false;
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}
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NEARBY_LOGS(INFO) << "Got IP: " << ip_address << " from WifiDirect GO.";
|
||
|
||
std::string last_ssid = wifi_direct_credentials->GetSSID();
|
||
medium_status_ |= kMediumStatusConnected;
|
||
NEARBY_LOGS(INFO) << "Connected to WifiDirect GO: " << last_ssid;
|
||
|
||
return true;
|
||
} catch (std::exception exception) {
|
||
NEARBY_LOGS(ERROR) << __func__
|
||
<< ": Cannot connet to WifiDirect GO. Exception: "
|
||
<< exception.what();
|
||
} catch (const winrt::hresult_error& error) {
|
||
NEARBY_LOGS(ERROR) << __func__
|
||
<< ": Cannot connet to WifiDirect GO. WinRT exception: "
|
||
<< error.code() << ": "
|
||
<< winrt::to_string(error.message());
|
||
} catch (...) {
|
||
NEARBY_LOGS(ERROR) << __func__ << ": Unknown exception.";
|
||
}
|
||
return false;
|
||
}
|
||
|
||
void WifiDirectMedium::RestoreWifiConnection() {
|
||
if (!wifi_connected_network_ && wifi_adapter_) {
|
||
wifi_adapter_.Disconnect();
|
||
return;
|
||
}
|
||
if (wifi_adapter_) {
|
||
ConnectionProfile profile =
|
||
wifi_adapter_.NetworkAdapter().GetConnectedProfileAsync().get();
|
||
std::string ssid;
|
||
|
||
if (profile != nullptr && profile.IsWlanConnectionProfile()) {
|
||
ssid = winrt::to_string(
|
||
profile.WlanConnectionProfileDetails().GetConnectedSsid());
|
||
if (!ssid.empty() &&
|
||
(winrt::to_string(wifi_connected_network_.Ssid()) == ssid)) {
|
||
NEARBY_LOGS(INFO) << "Already conneted to the previous WIFI network "
|
||
<< ssid << "! Skip restoration.";
|
||
return;
|
||
}
|
||
}
|
||
|
||
// Disconnect to the WiFi connection through the WiFi adapter.
|
||
wifi_adapter_.Disconnect();
|
||
NEARBY_LOGS(INFO) << "Disconnected to current network.";
|
||
|
||
auto connect_result = wifi_adapter_
|
||
.ConnectAsync(wifi_connected_network_,
|
||
WiFiReconnectionKind::Automatic)
|
||
.get();
|
||
|
||
if (connect_result == nullptr ||
|
||
connect_result.ConnectionStatus() != WiFiConnectionStatus::Success) {
|
||
NEARBY_LOGS(INFO) << "Connecting to previous network failed with reason: "
|
||
<< static_cast<int>(connect_result.ConnectionStatus());
|
||
} else {
|
||
NEARBY_LOGS(INFO) << "Restored the previous WIFI connection: "
|
||
<< winrt::to_string(wifi_connected_network_.Ssid());
|
||
}
|
||
wifi_connected_network_ = nullptr;
|
||
}
|
||
}
|
||
|
||
bool WifiDirectMedium::DisconnectWifiDirect() {
|
||
absl::MutexLock lock(&mutex_);
|
||
try {
|
||
return InternalDisconnectWifiDirect();
|
||
} catch (std::exception exception) {
|
||
NEARBY_LOGS(ERROR) << __func__
|
||
<< ": Disconnect WifiDirect GO failed. Exception: "
|
||
<< exception.what();
|
||
} catch (const winrt::hresult_error& error) {
|
||
NEARBY_LOGS(ERROR) << __func__
|
||
<< ": Disconnect WifiDirect GO failed. WinRT exception: "
|
||
<< error.code() << ": "
|
||
<< winrt::to_string(error.message());
|
||
} catch (...) {
|
||
NEARBY_LOGS(ERROR) << __func__ << ": Unknown exception.";
|
||
}
|
||
return false;
|
||
}
|
||
|
||
bool WifiDirectMedium::InternalDisconnectWifiDirect() {
|
||
if (!IsConnected()) {
|
||
NEARBY_LOGS(WARNING)
|
||
<< "Cannot disconnect WifiDirect GO because it is not connected.";
|
||
return true;
|
||
}
|
||
|
||
if (wifi_adapter_) {
|
||
// Gets connected WiFi profile.
|
||
auto profile =
|
||
wifi_adapter_.NetworkAdapter().GetConnectedProfileAsync().get();
|
||
|
||
// Disconnect to the WiFi connection through the WiFi adapter.
|
||
RestoreWifiConnection();
|
||
wifi_adapter_ = nullptr;
|
||
|
||
// Try to remove the WiFi profile
|
||
if (profile != nullptr && profile.CanDelete() &&
|
||
profile.IsWlanConnectionProfile()) {
|
||
std::string ssid = winrt::to_string(
|
||
profile.WlanConnectionProfileDetails().GetConnectedSsid());
|
||
|
||
auto profile_delete_status = profile.TryDeleteAsync().get();
|
||
switch (profile_delete_status) {
|
||
case ConnectionProfileDeleteStatus::Success:
|
||
NEARBY_LOGS(INFO)
|
||
<< "WiFi profile with SSID:" << ssid << " is deleted.";
|
||
break;
|
||
case ConnectionProfileDeleteStatus::DeniedBySystem:
|
||
NEARBY_LOGS(ERROR)
|
||
<< "Failed to delete WiFi profile with SSID:" << ssid
|
||
<< " due to denied by system.";
|
||
break;
|
||
case ConnectionProfileDeleteStatus::DeniedByUser:
|
||
NEARBY_LOGS(ERROR)
|
||
<< "Failed to delete WiFi profile with SSID:" << ssid
|
||
<< " due to denied by user.";
|
||
break;
|
||
case ConnectionProfileDeleteStatus::UnknownError:
|
||
NEARBY_LOGS(ERROR)
|
||
<< "Failed to delete WiFi profile with SSID:" << ssid
|
||
<< " due to unknonw error.";
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
medium_status_ &= (~kMediumStatusConnected);
|
||
return true;
|
||
}
|
||
|
||
std::string WifiDirectMedium::GetErrorMessage(std::exception_ptr eptr) {
|
||
try {
|
||
if (eptr) {
|
||
std::rethrow_exception(eptr);
|
||
} else {
|
||
return "";
|
||
}
|
||
} catch (const std::exception& e) {
|
||
return e.what();
|
||
}
|
||
}
|
||
|
||
} // namespace windows
|
||
} // namespace nearby
|