DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (5350524bb654)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsXULAppAPI.h"
#include "mozilla/AppData.h"
#include "application.ini.h"
#include "nsXPCOMGlue.h"
#if defined(XP_WIN)
#include <windows.h>
#include <stdlib.h>
#elif defined(XP_UNIX)
#include <sys/resource.h>
#include <unistd.h>
#endif

#include <stdio.h>
#include <stdarg.h>
#include <time.h>

#include "nsCOMPtr.h"
#include "nsIFile.h"
#include "nsStringGlue.h"

#ifdef XP_WIN
#ifdef MOZ_ASAN
// ASAN requires firefox.exe to be built with -MD, and it's OK if we don't
// support Windows XP SP2 in ASAN builds.
#define XRE_DONT_SUPPORT_XPSP2
#endif
#define XRE_WANT_ENVIRON
#define strcasecmp _stricmp
#ifdef MOZ_SANDBOX
#include "mozilla/sandboxing/SandboxInitialization.h"
#endif
#endif
#include "BinaryPath.h"

#include "nsXPCOMPrivate.h" // for MAXPATHLEN and XPCOM_DLL

#include "mozilla/Sprintf.h"
#include "mozilla/Telemetry.h"
#include "mozilla/WindowsDllBlocklist.h"

#if !defined(MOZ_WIDGET_COCOA) && !defined(MOZ_WIDGET_ANDROID) \
  && !(defined(XP_LINUX) && defined(MOZ_SANDBOX))
#define MOZ_BROWSER_CAN_BE_CONTENTPROC
#include "../../ipc/contentproc/plugin-container.cpp"
#endif

using namespace mozilla;

#ifdef XP_MACOSX
#define kOSXResourcesFolder "Resources"
#endif
#define kDesktopFolder "browser"

static void Output(const char *fmt, ... )
{
  va_list ap;
  va_start(ap, fmt);

#ifndef XP_WIN
  vfprintf(stderr, fmt, ap);
#else
  char msg[2048];
  vsnprintf_s(msg, _countof(msg), _TRUNCATE, fmt, ap);

  wchar_t wide_msg[2048];
  MultiByteToWideChar(CP_UTF8,
                      0,
                      msg,
                      -1,
                      wide_msg,
                      _countof(wide_msg));
#if MOZ_WINCONSOLE
  fwprintf_s(stderr, wide_msg);
#else
  // Linking user32 at load-time interferes with the DLL blocklist (bug 932100).
  // This is a rare codepath, so we can load user32 at run-time instead.
  HMODULE user32 = LoadLibraryW(L"user32.dll");
  if (user32) {
    decltype(MessageBoxW)* messageBoxW =
      (decltype(MessageBoxW)*) GetProcAddress(user32, "MessageBoxW");
    if (messageBoxW) {
      messageBoxW(nullptr, wide_msg, L"Firefox", MB_OK
                                               | MB_ICONERROR
                                               | MB_SETFOREGROUND);
    }
    FreeLibrary(user32);
  }
#endif
#endif

  va_end(ap);
}

/**
 * Return true if |arg| matches the given argument name.
 */
static bool IsArg(const char* arg, const char* s)
{
  if (*arg == '-')
  {
    if (*++arg == '-')
      ++arg;
    return !strcasecmp(arg, s);
  }

#if defined(XP_WIN)
  if (*arg == '/')
    return !strcasecmp(++arg, s);
#endif

  return false;
}

XRE_GetFileFromPathType XRE_GetFileFromPath;
XRE_CreateAppDataType XRE_CreateAppData;
XRE_FreeAppDataType XRE_FreeAppData;
XRE_TelemetryAccumulateType XRE_TelemetryAccumulate;
XRE_StartupTimelineRecordType XRE_StartupTimelineRecord;
XRE_mainType XRE_main;
XRE_StopLateWriteChecksType XRE_StopLateWriteChecks;
XRE_XPCShellMainType XRE_XPCShellMain;
XRE_GetProcessTypeType XRE_GetProcessType;
XRE_SetProcessTypeType XRE_SetProcessType;
XRE_InitChildProcessType XRE_InitChildProcess;
XRE_EnableSameExecutableForContentProcType XRE_EnableSameExecutableForContentProc;
#ifdef LIBFUZZER
XRE_LibFuzzerSetMainType XRE_LibFuzzerSetMain;
XRE_LibFuzzerGetFuncsType XRE_LibFuzzerGetFuncs;
#endif

static const nsDynamicFunctionLoad kXULFuncs[] = {
    { "XRE_GetFileFromPath", (NSFuncPtr*) &XRE_GetFileFromPath },
    { "XRE_CreateAppData", (NSFuncPtr*) &XRE_CreateAppData },
    { "XRE_FreeAppData", (NSFuncPtr*) &XRE_FreeAppData },
    { "XRE_TelemetryAccumulate", (NSFuncPtr*) &XRE_TelemetryAccumulate },
    { "XRE_StartupTimelineRecord", (NSFuncPtr*) &XRE_StartupTimelineRecord },
    { "XRE_main", (NSFuncPtr*) &XRE_main },
    { "XRE_StopLateWriteChecks", (NSFuncPtr*) &XRE_StopLateWriteChecks },
    { "XRE_XPCShellMain", (NSFuncPtr*) &XRE_XPCShellMain },
    { "XRE_GetProcessType", (NSFuncPtr*) &XRE_GetProcessType },
    { "XRE_SetProcessType", (NSFuncPtr*) &XRE_SetProcessType },
    { "XRE_InitChildProcess", (NSFuncPtr*) &XRE_InitChildProcess },
    { "XRE_EnableSameExecutableForContentProc", (NSFuncPtr*) &XRE_EnableSameExecutableForContentProc },
#ifdef LIBFUZZER
    { "XRE_LibFuzzerSetMain", (NSFuncPtr*) &XRE_LibFuzzerSetMain },
    { "XRE_LibFuzzerGetFuncs", (NSFuncPtr*) &XRE_LibFuzzerGetFuncs },
#endif
    { nullptr, nullptr }
};

#ifdef LIBFUZZER
int libfuzzer_main(int argc, char **argv);

/* This wrapper is used by the libFuzzer main to call into libxul */

void libFuzzerGetFuncs(const char* moduleName, LibFuzzerInitFunc* initFunc,
                       LibFuzzerTestingFunc* testingFunc) {
  return XRE_LibFuzzerGetFuncs(moduleName, initFunc, testingFunc);
}
#endif

static int do_main(int argc, char* argv[], char* envp[], nsIFile *xreDirectory)
{
  nsCOMPtr<nsIFile> appini;
  nsresult rv;
  uint32_t mainFlags = 0;

  // Allow firefox.exe to launch XULRunner apps via -app <application.ini>
  // Note that -app must be the *first* argument.
  const char *appDataFile = getenv("XUL_APP_FILE");
  if (appDataFile && *appDataFile) {
    rv = XRE_GetFileFromPath(appDataFile, getter_AddRefs(appini));
    if (NS_FAILED(rv)) {
      Output("Invalid path found: '%s'", appDataFile);
      return 255;
    }
  }
  else if (argc > 1 && IsArg(argv[1], "app")) {
    if (argc == 2) {
      Output("Incorrect number of arguments passed to -app");
      return 255;
    }

    rv = XRE_GetFileFromPath(argv[2], getter_AddRefs(appini));
    if (NS_FAILED(rv)) {
      Output("application.ini path not recognized: '%s'", argv[2]);
      return 255;
    }

    char appEnv[MAXPATHLEN];
    SprintfLiteral(appEnv, "XUL_APP_FILE=%s", argv[2]);
    if (putenv(strdup(appEnv))) {
      Output("Couldn't set %s.\n", appEnv);
      return 255;
    }
    argv[2] = argv[0];
    argv += 2;
    argc -= 2;
  } else if (argc > 1 && IsArg(argv[1], "xpcshell")) {
    for (int i = 1; i < argc; i++) {
      argv[i] = argv[i + 1];
    }

    XREShellData shellData;
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
    shellData.sandboxBrokerServices =
      sandboxing::GetInitializedBrokerServices();
#endif

    return XRE_XPCShellMain(--argc, argv, envp, &shellData);
  }

  if (appini) {
    nsXREAppData *appData;
    rv = XRE_CreateAppData(appini, &appData);
    if (NS_FAILED(rv)) {
      Output("Couldn't read application.ini");
      return 255;
    }
#if defined(HAS_DLL_BLOCKLIST)
    // The dll blocklist operates in the exe vs. xullib. Pass a flag to
    // xullib so automated tests can check the result once the browser
    // is up and running.
    appData->flags |=
      DllBlocklist_CheckStatus() ? NS_XRE_DLL_BLOCKLIST_ENABLED : 0;
#endif
    // xreDirectory already has a refcount from NS_NewLocalFile
    appData->xreDirectory = xreDirectory;
    int result = XRE_main(argc, argv, appData, mainFlags);
    XRE_FreeAppData(appData);
    return result;
  }

  ScopedAppData appData(&sAppData);
  nsCOMPtr<nsIFile> exeFile;
  rv = mozilla::BinaryPath::GetFile(argv[0], getter_AddRefs(exeFile));
  if (NS_FAILED(rv)) {
    Output("Couldn't find the application directory.\n");
    return 255;
  }

  nsCOMPtr<nsIFile> greDir;
  exeFile->GetParent(getter_AddRefs(greDir));
#ifdef XP_MACOSX
  greDir->SetNativeLeafName(NS_LITERAL_CSTRING(kOSXResourcesFolder));
#endif
  nsCOMPtr<nsIFile> appSubdir;
  greDir->Clone(getter_AddRefs(appSubdir));
  appSubdir->Append(NS_LITERAL_STRING(kDesktopFolder));

  SetStrongPtr(appData.directory, static_cast<nsIFile*>(appSubdir.get()));
  // xreDirectory already has a refcount from NS_NewLocalFile
  appData.xreDirectory = xreDirectory;

#if defined(HAS_DLL_BLOCKLIST)
  appData.flags |=
    DllBlocklist_CheckStatus() ? NS_XRE_DLL_BLOCKLIST_ENABLED : 0;
#endif

#if defined(XP_WIN) && defined(MOZ_SANDBOX)
  sandbox::BrokerServices* brokerServices =
    sandboxing::GetInitializedBrokerServices();
#if defined(MOZ_CONTENT_SANDBOX)
  if (!brokerServices) {
    Output("Couldn't initialize the broker services.\n");
    return 255;
  }
#endif
  appData.sandboxBrokerServices = brokerServices;
#endif

#ifdef LIBFUZZER
  if (getenv("LIBFUZZER"))
    XRE_LibFuzzerSetMain(argc, argv, libfuzzer_main);
#endif

  return XRE_main(argc, argv, &appData, mainFlags);
}

static bool
FileExists(const char *path)
{
#ifdef XP_WIN
  wchar_t wideDir[MAX_PATH];
  MultiByteToWideChar(CP_UTF8, 0, path, -1, wideDir, MAX_PATH);
  DWORD fileAttrs = GetFileAttributesW(wideDir);
  return fileAttrs != INVALID_FILE_ATTRIBUTES;
#else
  return access(path, R_OK) == 0;
#endif
}

static nsresult
InitXPCOMGlue(const char *argv0, nsIFile **xreDirectory)
{
  char exePath[MAXPATHLEN];

  nsresult rv = mozilla::BinaryPath::Get(argv0, exePath);
  if (NS_FAILED(rv)) {
    Output("Couldn't find the application directory.\n");
    return rv;
  }

  char *lastSlash = strrchr(exePath, XPCOM_FILE_PATH_SEPARATOR[0]);
  if (!lastSlash ||
      (size_t(lastSlash - exePath) > MAXPATHLEN - sizeof(XPCOM_DLL) - 1))
    return NS_ERROR_FAILURE;

  strcpy(lastSlash + 1, XPCOM_DLL);

  if (!FileExists(exePath)) {
    Output("Could not find the Mozilla runtime.\n");
    return NS_ERROR_FAILURE;
  }

  // We do this because of data in bug 771745
  XPCOMGlueEnablePreload();

  rv = XPCOMGlueStartup(exePath);
  if (NS_FAILED(rv)) {
    Output("Couldn't load XPCOM.\n");
    return rv;
  }

  rv = XPCOMGlueLoadXULFunctions(kXULFuncs);
  if (NS_FAILED(rv)) {
    Output("Couldn't load XRE functions.\n");
    return rv;
  }

  // This will set this thread as the main thread.
  NS_LogInit();

  if (xreDirectory) {
    // chop XPCOM_DLL off exePath
    *lastSlash = '\0';
#ifdef XP_MACOSX
    lastSlash = strrchr(exePath, XPCOM_FILE_PATH_SEPARATOR[0]);
    strcpy(lastSlash + 1, kOSXResourcesFolder);
#endif
#ifdef XP_WIN
    rv = NS_NewLocalFile(NS_ConvertUTF8toUTF16(exePath), false,
                         xreDirectory);
#else
    rv = NS_NewNativeLocalFile(nsDependentCString(exePath), false,
                               xreDirectory);
#endif
  }

  return rv;
}

int main(int argc, char* argv[], char* envp[])
{
  mozilla::TimeStamp start = mozilla::TimeStamp::Now();

#ifdef HAS_DLL_BLOCKLIST
  DllBlocklist_Initialize();

#ifdef DEBUG
  // In order to be effective against AppInit DLLs, the blocklist must be
  // initialized before user32.dll is loaded into the process (bug 932100).
  if (GetModuleHandleA("user32.dll")) {
    fprintf(stderr, "DLL blocklist was unable to intercept AppInit DLLs.\n");
  }
#endif
#endif

#ifdef MOZ_BROWSER_CAN_BE_CONTENTPROC
  // We are launching as a content process, delegate to the appropriate
  // main
  if (argc > 1 && IsArg(argv[1], "contentproc")) {
#if defined(XP_WIN) && defined(MOZ_SANDBOX)
    // We need to initialize the sandbox TargetServices before InitXPCOMGlue
    // because we might need the sandbox broker to give access to some files.
    if (IsSandboxedProcess() && !sandboxing::GetInitializedTargetServices()) {
      Output("Failed to initialize the sandbox target services.");
      return 255;
    }
#endif

    nsresult rv = InitXPCOMGlue(argv[0], nullptr);
    if (NS_FAILED(rv)) {
      return 255;
    }

    int result = content_process_main(argc, argv);

    // InitXPCOMGlue calls NS_LogInit, so we need to balance it here.
    NS_LogTerm();

    return result;
  }
#endif


  nsIFile *xreDirectory;

  nsresult rv = InitXPCOMGlue(argv[0], &xreDirectory);
  if (NS_FAILED(rv)) {
    return 255;
  }

  XRE_StartupTimelineRecord(mozilla::StartupTimeline::START, start);

#ifdef MOZ_BROWSER_CAN_BE_CONTENTPROC
  XRE_EnableSameExecutableForContentProc();
#endif

  int result = do_main(argc, argv, envp, xreDirectory);

  NS_LogTerm();

#ifdef XP_MACOSX
  // Allow writes again. While we would like to catch writes from static
  // destructors to allow early exits to use _exit, we know that there is
  // at least one such write that we don't control (see bug 826029). For
  // now we enable writes again and early exits will have to use exit instead
  // of _exit.
  XRE_StopLateWriteChecks();
#endif

  return result;
}