base/process/launch_win.cc

   1 // Copyright (c) 2012 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 "base/process/launch.h"
   6
   7 #include <fcntl.h>
   8 #include <io.h>
   9 #include <shellapi.h>
  10 #include <windows.h>
  11 #include <userenv.h>
  12 #include <psapi.h>
  13
  14 #include <ios>
  15 #include <limits>
  16
  17 #include "base/bind.h"
  18 #include "base/bind_helpers.h"
  19 #include "base/command_line.h"
  20 #include "base/debug/stack_trace.h"
  21 #include "base/logging.h"
  22 #include "base/memory/scoped_ptr.h"
  23 #include "base/message_loop/message_loop.h"
  24 #include "base/metrics/histogram.h"
  25 #include "base/process/kill.h"
  26 #include "base/strings/utf_string_conversions.h"
  27 #include "base/sys_info.h"
  28 #include "base/win/object_watcher.h"
  29 #include "base/win/scoped_handle.h"
  30 #include "base/win/scoped_process_information.h"
  31 #include "base/win/startup_information.h"
  32 #include "base/win/windows_version.h"
  33
  34 // userenv.dll is required for CreateEnvironmentBlock().
  35 #pragma comment(lib, "userenv.lib")
  36
  37 namespace base {
  38
  39 namespace {
  40
  41 // This exit code is used by the Windows task manager when it kills a
  42 // process.  It's value is obviously not that unique, and it's
  43 // surprising to me that the task manager uses this value, but it
  44 // seems to be common practice on Windows to test for it as an
  45 // indication that the task manager has killed something if the
  46 // process goes away.
  47 const DWORD kProcessKilledExitCode = 1;
  48
  49 }  // namespace
  50
  51 void RouteStdioToConsole() {
  52   // Don't change anything if stdout or stderr already point to a
  53   // valid stream.
  54   //
  55   // If we are running under Buildbot or under Cygwin's default
  56   // terminal (mintty), stderr and stderr will be pipe handles.  In
  57   // that case, we don't want to open CONOUT$, because its output
  58   // likely does not go anywhere.
  59   //
  60   // We don't use GetStdHandle() to check stdout/stderr here because
  61   // it can return dangling IDs of handles that were never inherited
  62   // by this process.  These IDs could have been reused by the time
  63   // this function is called.  The CRT checks the validity of
  64   // stdout/stderr on startup (before the handle IDs can be reused).
  65   // _fileno(stdout) will return -2 (_NO_CONSOLE_FILENO) if stdout was
  66   // invalid.
  67   if (_fileno(stdout) >= 0 || _fileno(stderr) >= 0)
  68     return;
  69
  70   if (!AttachConsole(ATTACH_PARENT_PROCESS)) {
  71     unsigned int result = GetLastError();
  72     // Was probably already attached.
  73     if (result == ERROR_ACCESS_DENIED)
  74       return;
  75     // Don't bother creating a new console for each child process if the
  76     // parent process is invalid (eg: crashed).
  77     if (result == ERROR_GEN_FAILURE)
  78       return;
  79     // Make a new console if attaching to parent fails with any other error.
  80     // It should be ERROR_INVALID_HANDLE at this point, which means the browser
  81     // was likely not started from a console.
  82     AllocConsole();
  83   }
  84
  85   // Arbitrary byte count to use when buffering output lines.  More
  86   // means potential waste, less means more risk of interleaved
  87   // log-lines in output.
  88   enum { kOutputBufferSize = 64 * 1024 };
  89
  90   if (freopen("CONOUT$", "w", stdout)) {
  91     setvbuf(stdout, NULL, _IOLBF, kOutputBufferSize);
  92     // Overwrite FD 1 for the benefit of any code that uses this FD
  93     // directly.  This is safe because the CRT allocates FDs 0, 1 and
  94     // 2 at startup even if they don't have valid underlying Windows
  95     // handles.  This means we won't be overwriting an FD created by
  96     // _open() after startup.
  97     _dup2(_fileno(stdout), 1);
  98   }
  99   if (freopen("CONOUT$", "w", stderr)) {
 100     setvbuf(stderr, NULL, _IOLBF, kOutputBufferSize);
 101     _dup2(_fileno(stderr), 2);
 102   }
 103
 104   // Fix all cout, wcout, cin, wcin, cerr, wcerr, clog and wclog.
 105   std::ios::sync_with_stdio();
 106 }
 107
 108 Process LaunchProcess(const CommandLine& cmdline,
 109                       const LaunchOptions& options) {
 110   return LaunchProcess(cmdline.GetCommandLineString(), options);
 111 }
 112
 113 Process LaunchProcess(const string16& cmdline,
 114                       const LaunchOptions& options) {
 115   win::StartupInformation startup_info_wrapper;
 116   STARTUPINFO* startup_info = startup_info_wrapper.startup_info();
 117
 118   bool inherit_handles = options.inherit_handles;
 119   DWORD flags = 0;
 120   if (options.handles_to_inherit) {
 121     if (options.handles_to_inherit->empty()) {
 122       inherit_handles = false;
 123     } else {
 124       if (base::win::GetVersion() < base::win::VERSION_VISTA) {
 125         DLOG(ERROR) << "Specifying handles to inherit requires Vista or later.";
 126         return Process();
 127       }
 128
 129       if (options.handles_to_inherit->size() >
 130               std::numeric_limits<DWORD>::max() / sizeof(HANDLE)) {
 131         DLOG(ERROR) << "Too many handles to inherit.";
 132         return Process();
 133       }
 134
 135       if (!startup_info_wrapper.InitializeProcThreadAttributeList(1)) {
 136         DPLOG(ERROR);
 137         return Process();
 138       }
 139
 140       if (!startup_info_wrapper.UpdateProcThreadAttribute(
 141               PROC_THREAD_ATTRIBUTE_HANDLE_LIST,
 142               const_cast<HANDLE*>(&options.handles_to_inherit->at(0)),
 143               static_cast<DWORD>(options.handles_to_inherit->size() *
 144                   sizeof(HANDLE)))) {
 145         DPLOG(ERROR);
 146         return Process();
 147       }
 148
 149       inherit_handles = true;
 150       flags |= EXTENDED_STARTUPINFO_PRESENT;
 151     }
 152   }
 153
 154   if (options.empty_desktop_name)
 155     startup_info->lpDesktop = const_cast<wchar_t*>(L"");
 156   startup_info->dwFlags = STARTF_USESHOWWINDOW;
 157   startup_info->wShowWindow = options.start_hidden ? SW_HIDE : SW_SHOW;
 158
 159   if (options.stdin_handle || options.stdout_handle || options.stderr_handle) {
 160     DCHECK(inherit_handles);
 161     DCHECK(options.stdin_handle);
 162     DCHECK(options.stdout_handle);
 163     DCHECK(options.stderr_handle);
 164     startup_info->dwFlags |= STARTF_USESTDHANDLES;
 165     startup_info->hStdInput = options.stdin_handle;
 166     startup_info->hStdOutput = options.stdout_handle;
 167     startup_info->hStdError = options.stderr_handle;
 168   }
 169
 170   if (options.job_handle) {
 171     flags |= CREATE_SUSPENDED;
 172
 173     // If this code is run under a debugger, the launched process is
 174     // automatically associated with a job object created by the debugger.
 175     // The CREATE_BREAKAWAY_FROM_JOB flag is used to prevent this.
 176     flags |= CREATE_BREAKAWAY_FROM_JOB;
 177   }
 178
 179   if (options.force_breakaway_from_job_)
 180     flags |= CREATE_BREAKAWAY_FROM_JOB;
 181
 182   PROCESS_INFORMATION temp_process_info = {};
 183
 184   string16 writable_cmdline(cmdline);
 185   if (options.as_user) {
 186     flags |= CREATE_UNICODE_ENVIRONMENT;
 187     void* enviroment_block = NULL;
 188
 189     if (!CreateEnvironmentBlock(&enviroment_block, options.as_user, FALSE)) {
 190       DPLOG(ERROR);
 191       return Process();
 192     }
 193
 194     BOOL launched =
 195         CreateProcessAsUser(options.as_user, NULL,
 196                             &writable_cmdline[0],
 197                             NULL, NULL, inherit_handles, flags,
 198                             enviroment_block, NULL, startup_info,
 199                             &temp_process_info);
 200     DestroyEnvironmentBlock(enviroment_block);
 201     if (!launched) {
 202       DPLOG(ERROR) << "Command line:" << std::endl << UTF16ToUTF8(cmdline)
 203                    << std::endl;;
 204       return Process();
 205     }
 206   } else {
 207     if (!CreateProcess(NULL,
 208                        &writable_cmdline[0], NULL, NULL,
 209                        inherit_handles, flags, NULL, NULL,
 210                        startup_info, &temp_process_info)) {
 211       DPLOG(ERROR) << "Command line:" << std::endl << UTF16ToUTF8(cmdline)
 212                    << std::endl;;
 213       return Process();
 214     }
 215   }
 216   base::win::ScopedProcessInformation process_info(temp_process_info);
 217
 218   if (options.job_handle) {
 219     if (0 == AssignProcessToJobObject(options.job_handle,
 220                                       process_info.process_handle())) {
 221       DLOG(ERROR) << "Could not AssignProcessToObject.";
 222       Process scoped_process(process_info.TakeProcessHandle());
 223       scoped_process.Terminate(kProcessKilledExitCode, true);
 224       return Process();
 225     }
 226
 227     ResumeThread(process_info.thread_handle());
 228   }
 229
 230   if (options.wait)
 231     WaitForSingleObject(process_info.process_handle(), INFINITE);
 232
 233   return Process(process_info.TakeProcessHandle());
 234 }
 235
 236 Process LaunchElevatedProcess(const CommandLine& cmdline,
 237                               const LaunchOptions& options) {
 238   const string16 file = cmdline.GetProgram().value();
 239   const string16 arguments = cmdline.GetArgumentsString();
 240
 241   SHELLEXECUTEINFO shex_info = {};
 242   shex_info.cbSize = sizeof(shex_info);
 243   shex_info.fMask = SEE_MASK_NOCLOSEPROCESS;
 244   shex_info.hwnd = GetActiveWindow();
 245   shex_info.lpVerb = L"runas";
 246   shex_info.lpFile = file.c_str();
 247   shex_info.lpParameters = arguments.c_str();
 248   shex_info.lpDirectory = NULL;
 249   shex_info.nShow = options.start_hidden ? SW_HIDE : SW_SHOW;
 250   shex_info.hInstApp = NULL;
 251
 252   if (!ShellExecuteEx(&shex_info)) {
 253     DPLOG(ERROR);
 254     return Process();
 255   }
 256
 257   if (options.wait)
 258     WaitForSingleObject(shex_info.hProcess, INFINITE);
 259
 260   return Process(shex_info.hProcess);
 261 }
 262
 263 bool SetJobObjectLimitFlags(HANDLE job_object, DWORD limit_flags) {
 264   JOBOBJECT_EXTENDED_LIMIT_INFORMATION limit_info = {};
 265   limit_info.BasicLimitInformation.LimitFlags = limit_flags;
 266   return 0 != SetInformationJobObject(
 267       job_object,
 268       JobObjectExtendedLimitInformation,
 269       &limit_info,
 270       sizeof(limit_info));
 271 }
 272
 273 bool GetAppOutput(const CommandLine& cl, std::string* output) {
 274   return GetAppOutput(cl.GetCommandLineString(), output);
 275 }
 276
 277 bool GetAppOutput(const StringPiece16& cl, std::string* output) {
 278   HANDLE out_read = NULL;
 279   HANDLE out_write = NULL;
 280
 281   SECURITY_ATTRIBUTES sa_attr;
 282   // Set the bInheritHandle flag so pipe handles are inherited.
 283   sa_attr.nLength = sizeof(SECURITY_ATTRIBUTES);
 284   sa_attr.bInheritHandle = TRUE;
 285   sa_attr.lpSecurityDescriptor = NULL;
 286
 287   // Create the pipe for the child process's STDOUT.
 288   if (!CreatePipe(&out_read, &out_write, &sa_attr, 0)) {
 289     NOTREACHED() << "Failed to create pipe";
 290     return false;
 291   }
 292
 293   // Ensure we don't leak the handles.
 294   win::ScopedHandle scoped_out_read(out_read);
 295   win::ScopedHandle scoped_out_write(out_write);
 296
 297   // Ensure the read handle to the pipe for STDOUT is not inherited.
 298   if (!SetHandleInformation(out_read, HANDLE_FLAG_INHERIT, 0)) {
 299     NOTREACHED() << "Failed to disabled pipe inheritance";
 300     return false;
 301   }
 302
 303   FilePath::StringType writable_command_line_string;
 304   writable_command_line_string.assign(cl.data(), cl.size());
 305
 306   STARTUPINFO start_info = {};
 307
 308   start_info.cb = sizeof(STARTUPINFO);
 309   start_info.hStdOutput = out_write;
 310   // Keep the normal stdin and stderr.
 311   start_info.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
 312   start_info.hStdError = GetStdHandle(STD_ERROR_HANDLE);
 313   start_info.dwFlags |= STARTF_USESTDHANDLES;
 314
 315   // Create the child process.
 316   PROCESS_INFORMATION temp_process_info = {};
 317   if (!CreateProcess(NULL,
 318                      &writable_command_line_string[0],
 319                      NULL, NULL,
 320                      TRUE,  // Handles are inherited.
 321                      0, NULL, NULL, &start_info, &temp_process_info)) {
 322     NOTREACHED() << "Failed to start process";
 323     return false;
 324   }
 325   base::win::ScopedProcessInformation proc_info(temp_process_info);
 326
 327   // Close our writing end of pipe now. Otherwise later read would not be able
 328   // to detect end of child's output.
 329   scoped_out_write.Close();
 330
 331   // Read output from the child process's pipe for STDOUT
 332   const int kBufferSize = 1024;
 333   char buffer[kBufferSize];
 334
 335   for (;;) {
 336     DWORD bytes_read = 0;
 337     BOOL success = ReadFile(out_read, buffer, kBufferSize, &bytes_read, NULL);
 338     if (!success || bytes_read == 0)
 339       break;
 340     output->append(buffer, bytes_read);
 341   }
 342
 343   // Let's wait for the process to finish.
 344   WaitForSingleObject(proc_info.process_handle(), INFINITE);
 345
 346   return true;
 347 }
 348
 349 void RaiseProcessToHighPriority() {
 350   SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS);
 351 }
 352
 353 }  // namespace base