Add EthernetDevice to manage ethernet connection.

The current fastbootd only supports USB protocol. But some Android TV
devices are built without USB port. The fastbootd cannot be used on
those ATV devices due to it. aosp/1295566 enables fastbootd over
ethernet.

This change adds an EthernetDevice to manage ethernet connection and set
fastbootd protcol property fastbootd.protocol to enable fastbootd over
ethernet in recovery mode. It uses IPv6 link-local address to not expose
the devices out of the network segment. The devices who want to use this
EthernetDevice should add
“TARGET_RECOVERY_UI_LIB := librecovery_ui_ethernet” into BoardConfig.mk.

BUG: 152544169
Test: Enter and exit fastboot mode and check eth0 IPv6 link-local address
on screen UI.

Change-Id: I73fe44be3790bdba5a6059fbba3f7264b21eed99

Android.mk

@@ -18,9 +18,9 @@ LOCAL_PATH := $(call my-dir)
 RECOVERY_API_VERSION := 3
 RECOVERY_FSTAB_VERSION := 2
 
-# TARGET_RECOVERY_UI_LIB should be one of librecovery_ui_{default,wear,vr} or a device-specific
-# module that defines make_device() and the exact RecoveryUI class for the target. It defaults to
-# librecovery_ui_default, which uses ScreenRecoveryUI.
+# TARGET_RECOVERY_UI_LIB should be one of librecovery_ui_{default,wear,vr,ethernet} or a
+# device-specific module that defines make_device() and the exact RecoveryUI class for the
+# target. It defaults to librecovery_ui_default, which uses ScreenRecoveryUI.
 TARGET_RECOVERY_UI_LIB ?= librecovery_ui_default
 
 # librecovery_ui_ext (shared library)

fastboot/fastboot.cpp

@@ -52,6 +52,7 @@ Device::BuiltinAction StartFastboot(Device* device, const std::vector<std::strin
   ui->ResetKeyInterruptStatus();
   ui->SetTitle(title_lines);
   ui->ShowText(true);
+  device->StartFastboot();
 
   // Reset to normal system boot so recovery won't cycle indefinitely.
   // TODO(b/112277594) Clear only if 'recovery' field of BCB is empty. If not,

recovery_main.cpp

@@ -471,6 +471,11 @@ int main(int argc, char** argv) {
     std::string usb_config =
         fastboot ? "fastboot" : IsRoDebuggable() || IsDeviceUnlocked() ? "adb" : "none";
     std::string usb_state = android::base::GetProperty("sys.usb.state", "none");
+    if (fastboot) {
+      device->PreFastboot();
+    } else {
+      device->PreRecovery();
+    }
     if (usb_config != usb_state) {
       if (!SetUsbConfig("none")) {
         LOG(ERROR) << "Failed to clear USB config";

recovery_ui/Android.bp

@@ -22,6 +22,7 @@ cc_library {
 
     srcs: [
         "device.cpp",
+        "ethernet_ui.cpp",
         "screen_ui.cpp",
         "stub_ui.cpp",
         "ui.cpp",
@@ -90,3 +91,23 @@ cc_library_static {
 
     export_include_dirs: ["include"],
 }
+
+// The default device that uses EthernetRecoveryUI.
+cc_library_static {
+    name: "librecovery_ui_ethernet",
+    recovery_available: true,
+
+    defaults: [
+        "recovery_defaults",
+    ],
+
+    srcs: [
+        "ethernet_device.cpp",
+    ],
+
+    shared_libs: [
+        "libbase",
+    ],
+
+    export_include_dirs: ["include"],
+}

recovery_ui/ethernet_device.cpp

@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+#include <arpa/inet.h>
+#include <ifaddrs.h>
+#include <linux/if.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include "recovery_ui/device.h"
+#include "recovery_ui/ethernet_ui.h"
+
+class EthernetDevice : public Device {
+ public:
+  explicit EthernetDevice(EthernetRecoveryUI* ui);
+
+  void PreRecovery() override;
+  void PreFastboot() override;
+
+ private:
+  int SetInterfaceFlags(const unsigned set, const unsigned clr);
+  void SetTitleIPv6LinkLocalAddress(const bool interface_up);
+
+  android::base::unique_fd ctl_sock_;
+  static const std::string interface;
+};
+
+const std::string EthernetDevice::interface = "eth0";
+
+EthernetDevice::EthernetDevice(EthernetRecoveryUI* ui)
+    : Device(ui), ctl_sock_(socket(AF_INET, SOCK_STREAM | SOCK_CLOEXEC, 0)) {
+  if (ctl_sock_ < 0) {
+    PLOG(ERROR) << "Failed to open socket";
+  }
+}
+
+void EthernetDevice::PreRecovery() {
+  SetInterfaceFlags(0, IFF_UP);
+  SetTitleIPv6LinkLocalAddress(false);
+}
+
+void EthernetDevice::PreFastboot() {
+  android::base::SetProperty("fastbootd.protocol", "tcp");
+
+  if (SetInterfaceFlags(IFF_UP, 0) < 0) {
+    LOG(ERROR) << "Failed to bring up interface";
+    return;
+  }
+
+  SetTitleIPv6LinkLocalAddress(true);
+}
+
+int EthernetDevice::SetInterfaceFlags(const unsigned set, const unsigned clr) {
+  struct ifreq ifr;
+
+  if (ctl_sock_ < 0) {
+    return -1;
+  }
+
+  memset(&ifr, 0, sizeof(struct ifreq));
+  strncpy(ifr.ifr_name, interface.c_str(), IFNAMSIZ);
+  ifr.ifr_name[IFNAMSIZ - 1] = 0;
+
+  if (ioctl(ctl_sock_, SIOCGIFFLAGS, &ifr) < 0) {
+    PLOG(ERROR) << "Failed to get interface active flags";
+    return -1;
+  }
+  ifr.ifr_flags = (ifr.ifr_flags & (~clr)) | set;
+
+  if (ioctl(ctl_sock_, SIOCSIFFLAGS, &ifr) < 0) {
+    PLOG(ERROR) << "Failed to set interface active flags";
+    return -1;
+  }
+
+  return 0;
+}
+
+void EthernetDevice::SetTitleIPv6LinkLocalAddress(const bool interface_up) {
+  auto recovery_ui = reinterpret_cast<EthernetRecoveryUI*>(GetUI());
+  if (!interface_up) {
+    recovery_ui->SetIPv6LinkLocalAddress();
+    return;
+  }
+
+  struct ifaddrs* ifaddr;
+  if (getifaddrs(&ifaddr) == -1) {
+    PLOG(ERROR) << "Failed to get interface addresses";
+    recovery_ui->SetIPv6LinkLocalAddress();
+    return;
+  }
+
+  std::unique_ptr<struct ifaddrs, decltype(&freeifaddrs)> guard{ ifaddr, freeifaddrs };
+  for (struct ifaddrs* ifa = ifaddr; ifa != nullptr; ifa = ifa->ifa_next) {
+    if (ifa->ifa_addr->sa_family != AF_INET6 || interface != ifa->ifa_name) {
+      continue;
+    }
+
+    auto current_addr = reinterpret_cast<struct sockaddr_in6*>(ifa->ifa_addr);
+    if (!IN6_IS_ADDR_LINKLOCAL(&(current_addr->sin6_addr))) {
+      continue;
+    }
+
+    char addrstr[INET6_ADDRSTRLEN];
+    inet_ntop(AF_INET6, reinterpret_cast<const void*>(&current_addr->sin6_addr), addrstr,
+              INET6_ADDRSTRLEN);
+    LOG(INFO) << "Our IPv6 link-local address is " << addrstr;
+    recovery_ui->SetIPv6LinkLocalAddress(addrstr);
+    return;
+  }
+
+  recovery_ui->SetIPv6LinkLocalAddress();
+}
+
+// -----------------------------------------------------------------------------------------
+Device* make_device() {
+  return new EthernetDevice(new EthernetRecoveryUI);
+}

recovery_ui/ethernet_ui.cpp

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#include "recovery_ui/ethernet_ui.h"
+
+#include <android-base/logging.h>
+
+void EthernetRecoveryUI::SetTitle(const std::vector<std::string>& lines) {
+  ScreenRecoveryUI::SetTitle(lines);
+
+  // Append IP address, if any
+  if (!address_.empty()) {
+    title_lines_.push_back("IPv6 link-local address - " + address_);
+  }
+}
+
+void EthernetRecoveryUI::SetIPv6LinkLocalAddress(const std::string& address) {
+  address_ = address;
+}

recovery_ui/include/recovery_ui/device.h

@@ -79,10 +79,22 @@ class Device {
     ui_.reset(ui);
   }
 
+  // Called before recovery mode started up, to perform whatever device-specific recovery mode
+  // preparation as needed.
+  virtual void PreRecovery() {}
+
   // Called when recovery starts up (after the UI has been obtained and initialized and after the
   // arguments have been parsed, but before anything else).
   virtual void StartRecovery() {}
 
+  // Called before fastboot mode is started up, to perform whatever device-specific fastboot mode
+  // preparation as needed.
+  virtual void PreFastboot() {}
+
+  // Called when fastboot starts up (after the UI has been obtained and initialized and after the
+  // arguments have been parsed, but before anything else).
+  virtual void StartFastboot() {}
+
   // Called from the main thread when recovery is at the main menu and waiting for input, and a key
   // is pressed. (Note that "at" the main menu does not necessarily mean the menu is visible;
   // recovery will be at the main menu with it invisible after an unsuccessful operation, such as

recovery_ui/include/recovery_ui/ethernet_ui.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+#ifndef RECOVERY_ETHERNET_UI_H
+#define RECOVERY_ETHERNET_UI_H
+
+#include "screen_ui.h"
+
+class EthernetRecoveryUI : public ScreenRecoveryUI {
+ public:
+  EthernetRecoveryUI() {}
+  void SetTitle(const std::vector<std::string>& lines) override;
+
+  // For EthernetDevice
+  void SetIPv6LinkLocalAddress(const std::string& address = "");
+
+ private:
+  std::string address_;
+};
+
+#endif  // RECOVERY_ETHERNET_UI_H