src/chrome/browser/apps/app_shim/app_shim_host_manager_mac.mm

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/apps/app_shim/app_shim_host_manager_mac.h"
   6
   7 #include <unistd.h>
   8
   9 #include "base/base64.h"
  10 #include "base/bind.h"
  11 #include "base/command_line.h"
  12 #include "base/files/file_path.h"
  13 #include "base/files/file_util.h"
  14 #include "base/logging.h"
  15 #include "base/path_service.h"
  16 #include "base/sha1.h"
  17 #include "base/strings/string_util.h"
  18 #include "chrome/browser/apps/app_shim/app_shim_handler_mac.h"
  19 #include "chrome/browser/apps/app_shim/app_shim_host_mac.h"
  20 #include "chrome/browser/browser_process.h"
  21 #include "chrome/common/chrome_paths.h"
  22 #include "chrome/common/chrome_switches.h"
  23 #include "chrome/common/chrome_version_info.h"
  24 #include "chrome/common/mac/app_mode_common.h"
  25
  26 using content::BrowserThread;
  27
  28 namespace {
  29
  30 void CreateAppShimHost(const IPC::ChannelHandle& handle) {
  31   // AppShimHost takes ownership of itself.
  32   (new AppShimHost)->ServeChannel(handle);
  33 }
  34
  35 base::FilePath GetDirectoryInTmpTemplate(const base::FilePath& user_data_dir) {
  36   base::FilePath temp_dir;
  37   CHECK(PathService::Get(base::DIR_TEMP, &temp_dir));
  38   // Check that it's shorter than the IPC socket length (104) minus the
  39   // intermediate folder ("/chrome-XXXXXX/") and kAppShimSocketShortName.
  40   DCHECK_GT(83u, temp_dir.value().length());
  41   return temp_dir.Append("chrome-XXXXXX");
  42 }
  43
  44 void DeleteSocketFiles(const base::FilePath& directory_in_tmp,
  45                        const base::FilePath& symlink_path,
  46                        const base::FilePath& version_path) {
  47   // Delete in reverse order of creation.
  48   if (!version_path.empty())
  49     base::DeleteFile(version_path, false);
  50   if (!symlink_path.empty())
  51     base::DeleteFile(symlink_path, false);
  52   if (!directory_in_tmp.empty())
  53     base::DeleteFile(directory_in_tmp, true);
  54 }
  55
  56 }  // namespace
  57
  58 AppShimHostManager::AppShimHostManager()
  59     : did_init_(false) {}
  60
  61 void AppShimHostManager::Init() {
  62   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  63   DCHECK(!did_init_);
  64   did_init_ = true;
  65   apps::AppShimHandler::SetDefaultHandler(&extension_app_shim_handler_);
  66   BrowserThread::PostTask(
  67       BrowserThread::FILE, FROM_HERE,
  68       base::Bind(&AppShimHostManager::InitOnFileThread, this));
  69 }
  70
  71 AppShimHostManager::~AppShimHostManager() {
  72   acceptor_.reset();
  73   if (!did_init_)
  74     return;
  75
  76   apps::AppShimHandler::SetDefaultHandler(NULL);
  77   base::FilePath user_data_dir;
  78   base::FilePath symlink_path;
  79   base::FilePath version_path;
  80   if (PathService::Get(chrome::DIR_USER_DATA, &user_data_dir)) {
  81     symlink_path = user_data_dir.Append(app_mode::kAppShimSocketSymlinkName);
  82     version_path =
  83         user_data_dir.Append(app_mode::kRunningChromeVersionSymlinkName);
  84   }
  85   BrowserThread::PostTask(
  86       BrowserThread::FILE,
  87       FROM_HERE,
  88       base::Bind(
  89           &DeleteSocketFiles, directory_in_tmp_, symlink_path, version_path));
  90 }
  91
  92 void AppShimHostManager::InitOnFileThread() {
  93   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
  94   base::FilePath user_data_dir;
  95   if (!PathService::Get(chrome::DIR_USER_DATA, &user_data_dir))
  96     return;
  97
  98   // The socket path must be shorter than 104 chars (IPC::kMaxSocketNameLength).
  99   // To accommodate this, we use a short path in /tmp/ that is generated from a
 100   // hash of the user data dir.
 101   std::string directory_string =
 102       GetDirectoryInTmpTemplate(user_data_dir).value();
 103
 104   // mkdtemp() replaces trailing X's randomly and creates the directory.
 105   if (!mkdtemp(&directory_string[0])) {
 106     PLOG(ERROR) << directory_string;
 107     return;
 108   }
 109
 110   directory_in_tmp_ = base::FilePath(directory_string);
 111   // Check that the directory was created with the correct permissions.
 112   int dir_mode = 0;
 113   if (!base::GetPosixFilePermissions(directory_in_tmp_, &dir_mode) ||
 114       dir_mode != base::FILE_PERMISSION_USER_MASK) {
 115     NOTREACHED();
 116     return;
 117   }
 118
 119   // UnixDomainSocketAcceptor creates the socket immediately.
 120   base::FilePath socket_path =
 121       directory_in_tmp_.Append(app_mode::kAppShimSocketShortName);
 122   acceptor_.reset(new apps::UnixDomainSocketAcceptor(socket_path, this));
 123
 124   // Create a symlink to the socket in the user data dir. This lets the shim
 125   // process started from Finder find the actual socket path by following the
 126   // symlink with ::readlink().
 127   base::FilePath symlink_path =
 128       user_data_dir.Append(app_mode::kAppShimSocketSymlinkName);
 129   base::DeleteFile(symlink_path, false);
 130   base::CreateSymbolicLink(socket_path, symlink_path);
 131
 132   // Create a symlink containing the current version string. This allows the
 133   // shim to load the same framework version as the currently running Chrome
 134   // process.
 135   base::FilePath version_path =
 136       user_data_dir.Append(app_mode::kRunningChromeVersionSymlinkName);
 137   base::DeleteFile(version_path, false);
 138   base::CreateSymbolicLink(base::FilePath(chrome::VersionInfo().Version()),
 139                            version_path);
 140
 141   BrowserThread::PostTask(
 142       BrowserThread::IO, FROM_HERE,
 143       base::Bind(&AppShimHostManager::ListenOnIOThread, this));
 144 }
 145
 146 void AppShimHostManager::ListenOnIOThread() {
 147   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 148   if (!acceptor_->Listen()) {
 149     BrowserThread::PostTask(
 150         BrowserThread::UI, FROM_HERE,
 151         base::Bind(&AppShimHostManager::OnListenError, this));
 152   }
 153 }
 154
 155 void AppShimHostManager::OnClientConnected(
 156     const IPC::ChannelHandle& handle) {
 157   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 158   BrowserThread::PostTask(
 159       BrowserThread::UI, FROM_HERE,
 160       base::Bind(&CreateAppShimHost, handle));
 161 }
 162
 163 void AppShimHostManager::OnListenError() {
 164   // TODO(tapted): Set a timeout and attempt to reconstruct the channel. Until
 165   // cases where the error could occur are better known, just reset the acceptor
 166   // to allow failure to be communicated via the test API.
 167   acceptor_.reset();
 168 }