xpcom/build/BinaryPath.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_BinaryPath_h
   8 #define mozilla_BinaryPath_h
   9
  10 #include "nsXPCOMPrivate.h"  // for MAXPATHLEN
  11 #ifdef XP_WIN
  12 #  include <windows.h>
  13 #elif defined(XP_DARWIN)
  14 #  include <CoreFoundation/CoreFoundation.h>
  15 #elif defined(XP_UNIX)
  16 #  include <unistd.h>
  17 #  include <stdlib.h>
  18 #  include <string.h>
  19 #endif
  20 #if defined(__FreeBSD__) || defined(__DragonFly__) || \
  21     defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
  22 #  include <sys/sysctl.h>
  23 #endif
  24 #if defined(__OpenBSD__)
  25 #  include <sys/stat.h>
  26 #endif
  27 #include "mozilla/UniquePtr.h"
  28 #include "mozilla/UniquePtrExtensions.h"
  29
  30 #ifdef MOZILLA_INTERNAL_API
  31 #  include "nsCOMPtr.h"
  32 #  include "nsIFile.h"
  33 #  include "nsString.h"
  34 #endif
  35
  36 namespace mozilla {
  37
  38 class BinaryPath {
  39  public:
  40 #ifdef XP_WIN
  41   static nsresult Get(char aResult[MAXPATHLEN]) {
  42     wchar_t wide_path[MAXPATHLEN];
  43     nsresult rv = GetW(wide_path);
  44     if (NS_FAILED(rv)) {
  45       return rv;
  46     }
  47     WideCharToMultiByte(CP_UTF8, 0, wide_path, -1, aResult, MAXPATHLEN, nullptr,
  48                         nullptr);
  49     return NS_OK;
  50   }
  51
  52   static nsresult GetLong(wchar_t aResult[MAXPATHLEN]) {
  53     static bool cached = false;
  54     static wchar_t exeLongPath[MAXPATHLEN] = L"";
  55
  56     if (!cached) {
  57       nsresult rv = GetW(exeLongPath);
  58
  59       if (NS_FAILED(rv)) {
  60         return rv;
  61       }
  62
  63       if (!::GetLongPathNameW(exeLongPath, exeLongPath, MAXPATHLEN)) {
  64         return NS_ERROR_FAILURE;
  65       }
  66
  67       cached = true;
  68     }
  69
  70     if (wcscpy_s(aResult, MAXPATHLEN, exeLongPath)) {
  71       return NS_ERROR_FAILURE;
  72     }
  73
  74     return NS_OK;
  75   }
  76
  77  private:
  78   static nsresult GetW(wchar_t aResult[MAXPATHLEN]) {
  79     static bool cached = false;
  80     static wchar_t moduleFileName[MAXPATHLEN] = L"";
  81
  82     if (!cached) {
  83       if (!::GetModuleFileNameW(0, moduleFileName, MAXPATHLEN)) {
  84         return NS_ERROR_FAILURE;
  85       }
  86
  87       cached = true;
  88     }
  89
  90     if (wcscpy_s(aResult, MAXPATHLEN, moduleFileName)) {
  91       return NS_ERROR_FAILURE;
  92     }
  93
  94     return NS_OK;
  95   }
  96
  97 #elif defined(XP_DARWIN)
  98   static nsresult Get(char aResult[MAXPATHLEN]) {
  99     // Works even if we're not bundled.
 100     CFBundleRef appBundle = CFBundleGetMainBundle();
 101     if (!appBundle) {
 102       return NS_ERROR_FAILURE;
 103     }
 104
 105     CFURLRef executableURL = CFBundleCopyExecutableURL(appBundle);
 106     if (!executableURL) {
 107       return NS_ERROR_FAILURE;
 108     }
 109
 110     nsresult rv;
 111     if (CFURLGetFileSystemRepresentation(executableURL, false, (UInt8*)aResult,
 112                                          MAXPATHLEN)) {
 113       // Sanitize path in case the app was launched from Terminal via
 114       // './firefox' for example.
 115       size_t readPos = 0;
 116       size_t writePos = 0;
 117       while (aResult[readPos] != '\0') {
 118         if (aResult[readPos] == '.' && aResult[readPos + 1] == '/') {
 119           readPos += 2;
 120         } else {
 121           aResult[writePos] = aResult[readPos];
 122           readPos++;
 123           writePos++;
 124         }
 125       }
 126       aResult[writePos] = '\0';
 127       rv = NS_OK;
 128     } else {
 129       rv = NS_ERROR_FAILURE;
 130     }
 131
 132     CFRelease(executableURL);
 133     return rv;
 134   }
 135
 136 #elif defined(ANDROID)
 137   static nsresult Get(char aResult[MAXPATHLEN]) {
 138     // On Android, we use the MOZ_ANDROID_LIBDIR variable that is set by the
 139     // Java bootstrap code.
 140     const char* libDir = getenv("MOZ_ANDROID_LIBDIR");
 141     if (!libDir) {
 142       return NS_ERROR_FAILURE;
 143     }
 144
 145     snprintf(aResult, MAXPATHLEN, "%s/%s", libDir, "dummy");
 146     aResult[MAXPATHLEN - 1] = '\0';
 147     return NS_OK;
 148   }
 149
 150 #elif defined(XP_LINUX) || defined(XP_SOLARIS)
 151   static nsresult Get(char aResult[MAXPATHLEN]) {
 152 #  if defined(XP_SOLARIS)
 153     const char path[] = "/proc/self/path/a.out";
 154 #  else
 155     const char path[] = "/proc/self/exe";
 156 #  endif
 157
 158     ssize_t len = readlink(path, aResult, MAXPATHLEN - 1);
 159     if (len < 0) {
 160       return NS_ERROR_FAILURE;
 161     }
 162     aResult[len] = '\0';
 163 #  if defined(XP_LINUX)
 164     // Removing suffix " (deleted)" from the binary path
 165     const char suffix[] = " (deleted)";
 166     const ssize_t suffix_len = sizeof(suffix);
 167     if (len >= suffix_len) {
 168       char* result_end = &aResult[len - (suffix_len - 1)];
 169       if (memcmp(result_end, suffix, suffix_len) == 0) {
 170         *result_end = '\0';
 171       }
 172     }
 173 #  endif
 174     return NS_OK;
 175   }
 176
 177 #elif defined(__FreeBSD__) || defined(__DragonFly__) || \
 178     defined(__FreeBSD_kernel__) || defined(__NetBSD__)
 179   static nsresult Get(char aResult[MAXPATHLEN]) {
 180     int mib[4];
 181     mib[0] = CTL_KERN;
 182 #  ifdef __NetBSD__
 183     mib[1] = KERN_PROC_ARGS;
 184     mib[2] = -1;
 185     mib[3] = KERN_PROC_PATHNAME;
 186 #  else
 187     mib[1] = KERN_PROC;
 188     mib[2] = KERN_PROC_PATHNAME;
 189     mib[3] = -1;
 190 #  endif
 191
 192     size_t len = MAXPATHLEN;
 193     if (sysctl(mib, 4, aResult, &len, nullptr, 0) < 0) {
 194       return NS_ERROR_FAILURE;
 195     }
 196
 197     return NS_OK;
 198   }
 199
 200 #elif defined(__OpenBSD__)
 201   static nsresult Get(char aResult[MAXPATHLEN]) {
 202     static bool cached = false;
 203     static char cachedPath[MAXPATHLEN];
 204     nsresult r;
 205     int mib[4];
 206     if (cached) {
 207       if (strlcpy(aResult, cachedPath, MAXPATHLEN) >= MAXPATHLEN) {
 208         return NS_ERROR_FAILURE;
 209       }
 210       return NS_OK;
 211     }
 212     mib[0] = CTL_KERN;
 213     mib[1] = KERN_PROC_ARGS;
 214     mib[2] = getpid();
 215     mib[3] = KERN_PROC_ARGV;
 216
 217     size_t len = 0;
 218     if (sysctl(mib, 4, nullptr, &len, nullptr, 0) < 0) {
 219       return NS_ERROR_FAILURE;
 220     }
 221
 222     auto argv = MakeUnique<const char*[]>(len / sizeof(const char*));
 223     if (sysctl(mib, 4, argv.get(), &len, nullptr, 0) < 0) {
 224       return NS_ERROR_FAILURE;
 225     }
 226
 227     r = GetFromArgv0(argv[0], aResult);
 228     if (NS_SUCCEEDED(r)) {
 229       if (strlcpy(cachedPath, aResult, MAXPATHLEN) >= MAXPATHLEN) {
 230         return NS_ERROR_FAILURE;
 231       }
 232       cached = true;
 233     }
 234     return r;
 235   }
 236
 237   static nsresult GetFromArgv0(const char* aArgv0, char aResult[MAXPATHLEN]) {
 238     struct stat fileStat;
 239     // 1) use realpath() on argv[0], which works unless we're loaded from the
 240     //    PATH. Only do so if argv[0] looks like a path (contains a /).
 241     // 2) manually walk through the PATH and look for ourself
 242     // 3) give up
 243     if (strchr(aArgv0, '/') && realpath(aArgv0, aResult) &&
 244         stat(aResult, &fileStat) == 0) {
 245       return NS_OK;
 246     }
 247
 248     const char* path = getenv("PATH");
 249     if (!path) {
 250       return NS_ERROR_FAILURE;
 251     }
 252
 253     char* pathdup = strdup(path);
 254     if (!pathdup) {
 255       return NS_ERROR_OUT_OF_MEMORY;
 256     }
 257
 258     bool found = false;
 259     char* token = strtok(pathdup, ":");
 260     while (token) {
 261       char tmpPath[MAXPATHLEN];
 262       sprintf(tmpPath, "%s/%s", token, aArgv0);
 263       if (realpath(tmpPath, aResult) && stat(aResult, &fileStat) == 0) {
 264         found = true;
 265         break;
 266       }
 267       token = strtok(nullptr, ":");
 268     }
 269     free(pathdup);
 270     if (found) {
 271       return NS_OK;
 272     }
 273     return NS_ERROR_FAILURE;
 274   }
 275
 276 #else
 277 #  error Oops, you need platform-specific code here
 278 #endif
 279
 280  public:
 281   static UniqueFreePtr<char> Get() {
 282     char path[MAXPATHLEN];
 283     if (NS_FAILED(Get(path))) {
 284       return nullptr;
 285     }
 286     UniqueFreePtr<char> result;
 287     result.reset(strdup(path));
 288     return result;
 289   }
 290
 291 #ifdef MOZILLA_INTERNAL_API
 292   static nsresult GetFile(nsIFile** aResult) {
 293     nsCOMPtr<nsIFile> lf;
 294 #  ifdef XP_WIN
 295     wchar_t exePath[MAXPATHLEN];
 296     nsresult rv = GetW(exePath);
 297 #  else
 298     char exePath[MAXPATHLEN];
 299     nsresult rv = Get(exePath);
 300 #  endif
 301     if (NS_FAILED(rv)) {
 302       return rv;
 303     }
 304     MOZ_TRY(NS_NewPathStringLocalFile(DependentPathString(exePath),
 305                                       getter_AddRefs(lf)));
 306     lf.forget(aResult);
 307     return NS_OK;
 308   }
 309 #endif
 310 };
 311
 312 }  // namespace mozilla
 313
 314 #endif /* mozilla_BinaryPath_h */