The me2me host is now configurable from the web UI on Windows.

remoting/host/elevated_controller_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/elevated_controller_win.h"
 
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "base/json/json_reader.h"
+#include "base/json/json_writer.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/path_service.h"
+#include "base/utf_string_conversions.h"
+#include "base/values.h"
+#include "base/win/scoped_handle.h"
+#include "remoting/host/branding.h"
+
 // MIDL-generated definitions.
-#include <elevated_controller_i.c>
+#include "elevated_controller_i.c"
 
-using ATL::CComQIPtr;
-using ATL::CComPtr;
+namespace {
+
+// ReadConfig() filters the configuration file stripping all variables except of
+// the following two.
+const char kHostId[] = "host_id";
+const char kXmppLogin[] = "xmpp_login";
+
+// Names of the configuration files.
+const FilePath::CharType kAuthConfigFilename[] = FILE_PATH_LITERAL("auth.json");
+const FilePath::CharType kHostConfigFilename[] = FILE_PATH_LITERAL("host.json");
+
+// TODO(alexeypa): Remove the hardcoded undocumented paths and store
+// the configuration in the registry.
+#ifdef OFFICIAL_BUILD
+const FilePath::CharType kConfigDir[] = FILE_PATH_LITERAL(
+    "config\\systemprofile\\AppData\\Local\\Google\\Chrome Remote Desktop");
+#else
+const FilePath::CharType kConfigDir[] =
+    FILE_PATH_LITERAL("config\\systemprofile\\AppData\\Local\\Chromoting");
+#endif
+
+// Reads and parses a JSON configuration file.
+HRESULT ReadConfig(const FilePath& filename,
+                   scoped_ptr<base::DictionaryValue>* config_out) {
+  // TODO(alexeypa): Remove 64KB limitation.
+  const size_t kMaxConfigFileSize = 64 * 1024;
+
+  // Read raw data from the configuration file.
+  base::win::ScopedHandle file(
+      CreateFileW(filename.value().c_str(),
+                  GENERIC_READ,
+                  FILE_SHARE_READ | FILE_SHARE_WRITE,
+                  NULL,
+                  OPEN_EXISTING,
+                  FILE_FLAG_SEQUENTIAL_SCAN,
+                  NULL));
+
+  if (!file.IsValid()) {
+    DWORD error = GetLastError();
+    LOG_GETLASTERROR(ERROR)
+        << "Failed to read '" << filename.value() << "'";
+    return HRESULT_FROM_WIN32(error);
+  }
+
+  std::vector<char> buffer(kMaxConfigFileSize);
+  DWORD size = static_cast<DWORD>(buffer.size());
+  if (!::ReadFile(file, &buffer[0], size, &size, NULL)) {
+    DWORD error = GetLastError();
+    LOG_GETLASTERROR(ERROR)
+        << "Failed to read '" << filename.value() << "'";
+    return HRESULT_FROM_WIN32(error);
+  }
+
+  // Parse the JSON configuration, expecting it to contain a dictionary.
+  std::string file_content(&buffer[0], size);
+  scoped_ptr<base::Value> value(base::JSONReader::Read(file_content, true));
+
+  base::DictionaryValue* dictionary;
+  if (value.get() == NULL || !value->GetAsDictionary(&dictionary)) {
+    LOG(ERROR) << "Failed to read '" << filename.value() << "'.";
+    return E_FAIL;
+  }
+
+  value.release();
+  config_out->reset(dictionary);
+  return S_OK;
+}
+
+} // namespace
 
 namespace remoting {
 
 ElevatedControllerWin::ElevatedControllerWin() {
 }
 
 HRESULT ElevatedControllerWin::FinalConstruct() {
   return S_OK;
 }
 
 void ElevatedControllerWin::FinalRelease() {
 }
 
-STDMETHODIMP ElevatedControllerWin::get_State(DaemonState* state_out) {
-  return E_NOTIMPL;
+STDMETHODIMP ElevatedControllerWin::GetConfig(BSTR* config_out) {
+  FilePath system_profile;
+  PathService::Get(base::DIR_SYSTEM, &system_profile);
+
+  // Read the host configuration.
+  scoped_ptr<base::DictionaryValue> config;
+  HRESULT hr = ReadConfig(
+      system_profile.Append(kConfigDir).Append(kHostConfigFilename),
+      &config);
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  // Build the filtered config.
+  scoped_ptr<base::DictionaryValue> filtered_config(
+      new base::DictionaryValue());
+
+  std::string value;
+  if (config->GetString(kHostId, &value)) {
+    filtered_config->SetString(kHostId, value);
+  }
+  if (config->GetString(kXmppLogin, &value)) {
+    filtered_config->SetString(kXmppLogin, value);
+  }
+
+  // Convert the filtered config back to a string and return it to the caller.
+  std::string file_content;
+  base::JSONWriter::Write(filtered_config.get(), &file_content);
+
+  *config_out = ::SysAllocString(UTF8ToUTF16(file_content).c_str());
+  if (config_out == NULL) {
+    return E_OUTOFMEMORY;
+  }
+
+  return S_OK;
 }
 
-STDMETHODIMP ElevatedControllerWin::ReadConfig(BSTR* config_out) {
-  return E_NOTIMPL;
-}
+STDMETHODIMP ElevatedControllerWin::SetConfig(BSTR config) {
+  // Determine the config directory path and create it if necessary.
+  // N.B. The configuration files are stored in LocalSystems's profile which is
+  // not readable by non administrators.
+  FilePath system_profile;
+  PathService::Get(base::DIR_SYSTEM, &system_profile);
+  FilePath config_dir = system_profile.Append(kConfigDir);
+  if (!file_util::CreateDirectory(config_dir)) {
+    return HRESULT_FROM_WIN32(ERROR_ACCESS_DENIED);
+  }
 
-STDMETHODIMP ElevatedControllerWin::WriteConfig(BSTR config) {
-  return E_NOTIMPL;
+  std::string file_content = UTF16ToUTF8(
+    string16(static_cast<char16*>(config), ::SysStringLen(config)));
+
+  int written = file_util::WriteFile(
+      config_dir.Append(kAuthConfigFilename),
+      file_content.c_str(),
+      file_content.size());
+  if (written != static_cast<int>(file_content.size())) {
+    return HRESULT_FROM_WIN32(ERROR_ACCESS_DENIED);
+  }
+
+  // TODO(alexeypa): Store the authentication and host configurations in a
+  // single file.
+  written = file_util::WriteFile(
+      config_dir.Append(kHostConfigFilename),
+      file_content.c_str(),
+      file_content.size());
+  if (written != static_cast<int>(file_content.size())) {
+    return E_FAIL;
+  }
+
+  return S_OK;
 }
 
 STDMETHODIMP ElevatedControllerWin::StartDaemon() {
-  return E_NOTIMPL;
-}
-
-STDMETHODIMP ElevatedControllerWin::StopDaemon() {
-  return E_NOTIMPL;
-}
-
-HRESULT ElevatedControllerWin::FireOnStateChange(DaemonState state) {
-  CComPtr<IConnectionPoint> connection_point;
-  FindConnectionPoint(__uuidof(IDaemonEvents), &connection_point);
-  if (!connection_point) {
-    return S_OK;
+  ScopedScHandle service;
+  HRESULT hr = OpenService(&service);
+  if (FAILED(hr)) {
+    return hr;
   }
 
-  CComPtr<IEnumConnections> connections;
-  if (FAILED(connection_point->EnumConnections(&connections))) {
-    return S_OK;
-  }
+  if (!StartService(service, 0, NULL)) {
+    DWORD error = GetLastError();
+    if (error != ERROR_SERVICE_ALREADY_RUNNING) {
+      LOG_GETLASTERROR(ERROR)
+          << "Failed to start the '" << kWindowsServiceName << "'service";
 
-  CONNECTDATA connect_data;
-  while (connections->Next(1, &connect_data, NULL) == S_OK) {
-    if (connect_data.pUnk != NULL) {
-      CComQIPtr<IDaemonEvents, &__uuidof(IDaemonEvents)> sink(
-          connect_data.pUnk);
-
-      if (sink != NULL) {
-        sink->OnStateChange(state);
-      }
-
-      connect_data.pUnk->Release();
+      return HRESULT_FROM_WIN32(error);
     }
   }
 
   return S_OK;
 }
 
+STDMETHODIMP ElevatedControllerWin::StopDaemon() {
+  ScopedScHandle service;
+  HRESULT hr = OpenService(&service);
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  SERVICE_STATUS status;
+  if (!ControlService(service, SERVICE_CONTROL_STOP, &status)) {
+    DWORD error = GetLastError();
+    if (error != ERROR_SERVICE_NOT_ACTIVE) {
+      LOG_GETLASTERROR(ERROR)
+          << "Failed to stop the '" << kWindowsServiceName << "'service";
+      return HRESULT_FROM_WIN32(error);
+    }
+  }
+
+  return S_OK;
+}
+
+HRESULT ElevatedControllerWin::OpenService(ScopedScHandle* service_out) {
+  DWORD error;
+
+  ScopedScHandle scmanager(
+      ::OpenSCManagerW(NULL, SERVICES_ACTIVE_DATABASE,
+                       SC_MANAGER_CONNECT | SC_MANAGER_ENUMERATE_SERVICE));
+  if (!scmanager.IsValid()) {
+    error = GetLastError();
+    LOG_GETLASTERROR(ERROR)
+        << "Failed to connect to the service control manager";
+
+    return HRESULT_FROM_WIN32(error);
+  }
+
+  ScopedScHandle service(
+      ::OpenServiceW(scmanager, UTF8ToUTF16(kWindowsServiceName).c_str(),
+                     SERVICE_QUERY_STATUS | SERVICE_START | SERVICE_STOP));
+  if (!service.IsValid()) {
+    error = GetLastError();
+    LOG_GETLASTERROR(ERROR)
+        << "Failed to open to the '" << kWindowsServiceName << "' service";
+
+    return HRESULT_FROM_WIN32(error);
+  }
+
+  service_out->Set(service.Take());
+  return S_OK;
+}
+
 } // namespace remoting