The Tor Browser: dom/plugins/base/nsPluginsDirUnix.cpp@6474c204b198 (annotated)

dom/plugins/base/nsPluginsDirUnix.cpp@6474c204b198 (annotated)

dom/plugins/base/nsPluginsDirUnix.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* 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 "nsNPAPIPlugin.h"
 #include "nsNPAPIPluginInstance.h"
 #include "nsIMemory.h"
 #include "nsPluginsDir.h"
 #include "nsPluginsDirUtils.h"
 #include "prmem.h"
 #include "prenv.h"
 #include "prerror.h"
 #include "prio.h"
 #include <sys/stat.h>
 #include "nsString.h"
 #include "nsIFile.h"
 #include "nsIPrefBranch.h"
 #include "nsIPrefService.h"
 #define LOCAL_PLUGIN_DLL_SUFFIX ".so"
 #if defined(__hpux)
 #define DEFAULT_X11_PATH "/usr/lib/X11R6/"
 #undef LOCAL_PLUGIN_DLL_SUFFIX
 #define LOCAL_PLUGIN_DLL_SUFFIX ".sl"
 #define LOCAL_PLUGIN_DLL_ALT_SUFFIX ".so"
 #elif defined(_AIX)
 #define DEFAULT_X11_PATH "/usr/lib"
 #define LOCAL_PLUGIN_DLL_ALT_SUFFIX ".a"
 #elif defined(SOLARIS)
 #define DEFAULT_X11_PATH "/usr/openwin/lib/"
 #elif defined(LINUX)
 #define DEFAULT_X11_PATH "/usr/X11R6/lib/"
 #elif defined(__APPLE__)
 #define DEFAULT_X11_PATH "/usr/X11R6/lib"
 #undef LOCAL_PLUGIN_DLL_SUFFIX
 #define LOCAL_PLUGIN_DLL_SUFFIX ".dylib"
 #define LOCAL_PLUGIN_DLL_ALT_SUFFIX ".so"
 #else
 #define DEFAULT_X11_PATH ""
 #endif
 #if (MOZ_WIDGET_GTK == 2)
 #define PLUGIN_MAX_LEN_OF_TMP_ARR 512
 static void DisplayPR_LoadLibraryErrorMessage(const char *libName)
 {
     char errorMsg[PLUGIN_MAX_LEN_OF_TMP_ARR] = "Cannot get error from NSPR.";
     if (PR_GetErrorTextLength() < (int) sizeof(errorMsg))
         PR_GetErrorText(errorMsg);
     fprintf(stderr, "LoadPlugin: failed to initialize shared library %s [%s]\n",
         libName, errorMsg);
 }
 static void SearchForSoname(const char* name, char** soname)
 {
     if (!(name && soname))
         return;
     PRDir *fdDir = PR_OpenDir(DEFAULT_X11_PATH);
     if (!fdDir)
         return;
     int n = strlen(name);
     PRDirEntry *dirEntry;
     while ((dirEntry = PR_ReadDir(fdDir, PR_SKIP_BOTH))) {
         if (!PL_strncmp(dirEntry->name, name, n)) {
             if (dirEntry->name[n] == '.' && dirEntry->name[n+1] && !dirEntry->name[n+2]) {
                 // name.N, wild guess this is what we need
                 char out[PLUGIN_MAX_LEN_OF_TMP_ARR] = DEFAULT_X11_PATH;
                 PL_strcat(out, dirEntry->name);
                 *soname = PL_strdup(out);
                break;
             }
         }
     }
     PR_CloseDir(fdDir);
 }
 static bool LoadExtraSharedLib(const char *name, char **soname, bool tryToGetSoname)
 {
     bool ret = true;
     PRLibSpec tempSpec;
     PRLibrary *handle;
     tempSpec.type = PR_LibSpec_Pathname;
     tempSpec.value.pathname = name;
     handle = PR_LoadLibraryWithFlags(tempSpec, PR_LD_NOW|PR_LD_GLOBAL);
     if (!handle) {
         ret = false;
         DisplayPR_LoadLibraryErrorMessage(name);
         if (tryToGetSoname) {
             SearchForSoname(name, soname);
             if (*soname) {
                 ret = LoadExtraSharedLib((const char *) *soname, nullptr, false);
             }
         }
     }
     return ret;
 }
 #define PLUGIN_MAX_NUMBER_OF_EXTRA_LIBS 32
 #define PREF_PLUGINS_SONAME "plugin.soname.list"
 #if defined(SOLARIS) || defined(HPUX)
 #define DEFAULT_EXTRA_LIBS_LIST "libXt" LOCAL_PLUGIN_DLL_SUFFIX ":libXext" LOCAL_PLUGIN_DLL_SUFFIX ":libXm" LOCAL_PLUGIN_DLL_SUFFIX
 #else
 #define DEFAULT_EXTRA_LIBS_LIST "libXt" LOCAL_PLUGIN_DLL_SUFFIX ":libXext" LOCAL_PLUGIN_DLL_SUFFIX
 #endif
 /*
  this function looks for
  user_pref("plugin.soname.list", "/usr/X11R6/lib/libXt.so.6:libXext.so");
  in user's pref.js
  and loads all libs in specified order
 */
 static void LoadExtraSharedLibs()
 {
     // check out if user's prefs.js has libs name
     nsresult res;
     nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID, &res));
     if (NS_SUCCEEDED(res) && (prefs != nullptr)) {
         char *sonameList = nullptr;
         bool prefSonameListIsSet = true;
         res = prefs->GetCharPref(PREF_PLUGINS_SONAME, &sonameList);
         if (!sonameList) {
             // pref is not set, lets use hardcoded list
             prefSonameListIsSet = false;
             sonameList = PL_strdup(DEFAULT_EXTRA_LIBS_LIST);
         }
         if (sonameList) {
             char *arrayOfLibs[PLUGIN_MAX_NUMBER_OF_EXTRA_LIBS] = {0};
             int numOfLibs = 0;
             char *nextToken;
             char *p = nsCRT::strtok(sonameList,":",&nextToken);
             if (p) {
                 while (p && numOfLibs < PLUGIN_MAX_NUMBER_OF_EXTRA_LIBS) {
                     arrayOfLibs[numOfLibs++] = p;
                     p = nsCRT::strtok(nextToken,":",&nextToken);
                 }
             } else // there is just one lib
                 arrayOfLibs[numOfLibs++] = sonameList;
             char sonameListToSave[PLUGIN_MAX_LEN_OF_TMP_ARR] = "";
             for (int i=0; i<numOfLibs; i++) {
                 // trim out head/tail white spaces (just in case)
                 bool head = true;
                 p = arrayOfLibs[i];
                 while (*p) {
                     if (*p == ' ' || *p == '\t') {
                         if (head) {
                             arrayOfLibs[i] = ++p;
                         } else {
                             *p = 0;
                         }
                     } else {
                         head = false;
                         p++;
                     }
                 }
                 if (!arrayOfLibs[i][0]) {
                     continue; // null string
                 }
                 bool tryToGetSoname = true;
                 if (PL_strchr(arrayOfLibs[i], '/')) {
                     //assuming it's real name, try to stat it
                     struct stat st;
                     if (stat((const char*) arrayOfLibs[i], &st)) {
                         //get just a file name
                         arrayOfLibs[i] = PL_strrchr(arrayOfLibs[i], '/') + 1;
                     } else
                         tryToGetSoname = false;
                 }
                 char *soname = nullptr;
                 if (LoadExtraSharedLib(arrayOfLibs[i], &soname, tryToGetSoname)) {
                     //construct soname's list to save in prefs
                     p = soname ? soname : arrayOfLibs[i];
                     int n = PLUGIN_MAX_LEN_OF_TMP_ARR -
                         (strlen(sonameListToSave) + strlen(p));
                     if (n > 0) {
                         PL_strcat(sonameListToSave, p);
                         PL_strcat(sonameListToSave,":");
                     }
                     if (soname) {
                         PL_strfree(soname); // it's from strdup
                     }
                     if (numOfLibs > 1)
                         arrayOfLibs[i][strlen(arrayOfLibs[i])] = ':'; //restore ":" in sonameList
                 }
             }
             // Check whether sonameListToSave is a empty String, Bug: 329205
             if (sonameListToSave[0])
                 for (p = &sonameListToSave[strlen(sonameListToSave) - 1]; *p == ':'; p--)
                     *p = 0; //delete tail ":" delimiters
             if (!prefSonameListIsSet || PL_strcmp(sonameList, sonameListToSave)) {
                 // if user specified some bogus soname I overwrite it here,
                 // otherwise it'll decrease performance by calling popen() in SearchForSoname
                 // every time for each bogus name
                 prefs->SetCharPref(PREF_PLUGINS_SONAME, (const char *)sonameListToSave);
             }
             PL_strfree(sonameList);
         }
     }
 }
 #endif //MOZ_WIDGET_GTK2
 /* nsPluginsDir implementation */
 bool nsPluginsDir::IsPluginFile(nsIFile* file)
 {
     nsAutoCString filename;
     if (NS_FAILED(file->GetNativeLeafName(filename)))
         return false;
 #ifdef ANDROID
     // It appears that if you load
     // 'libstagefright_honeycomb.so' on froyo, or
     // 'libstagefright_froyo.so' on honeycomb, we will abort.
     // Since these are just helper libs, we can ignore.
     const char *cFile = filename.get();
     if (strstr(cFile, "libstagefright") != nullptr)
         return false;
 #endif
     NS_NAMED_LITERAL_CSTRING(dllSuffix, LOCAL_PLUGIN_DLL_SUFFIX);
     if (filename.Length() > dllSuffix.Length() &&
         StringEndsWith(filename, dllSuffix))
         return true;
 #ifdef LOCAL_PLUGIN_DLL_ALT_SUFFIX
     NS_NAMED_LITERAL_CSTRING(dllAltSuffix, LOCAL_PLUGIN_DLL_ALT_SUFFIX);
     if (filename.Length() > dllAltSuffix.Length() &&
         StringEndsWith(filename, dllAltSuffix))
         return true;
 #endif
     return false;
 }
 /* nsPluginFile implementation */
 nsPluginFile::nsPluginFile(nsIFile* file)
 : mPlugin(file)
 {
 }
 nsPluginFile::~nsPluginFile()
 {
 }
 nsresult nsPluginFile::LoadPlugin(PRLibrary **outLibrary)
 {
     PRLibSpec libSpec;
     libSpec.type = PR_LibSpec_Pathname;
     bool exists = false;
     mPlugin->Exists(&exists);
     if (!exists)
         return NS_ERROR_FILE_NOT_FOUND;
     nsresult rv;
     nsAutoCString path;
     rv = mPlugin->GetNativePath(path);
     if (NS_FAILED(rv))
         return rv;
     libSpec.value.pathname = path.get();
 #if (MOZ_WIDGET_GTK == 2)
     // Normally, Mozilla isn't linked against libXt and libXext
     // since it's a Gtk/Gdk application.  On the other hand,
     // legacy plug-ins expect the libXt and libXext symbols
     // to already exist in the global name space.  This plug-in
     // wrapper is linked against libXt and libXext, but since
     // we never call on any of these libraries, plug-ins still
     // fail to resolve Xt symbols when trying to do a dlopen
     // at runtime.  Explicitly opening Xt/Xext into the global
     // namespace before attempting to load the plug-in seems to
     // work fine.
 #if defined(SOLARIS) || defined(HPUX)
     // Acrobat/libXm: Lazy resolving might cause crash later (bug 211587)
     *outLibrary = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW);
     pLibrary = *outLibrary;
 #else
     // Some dlopen() doesn't recover from a failed PR_LD_NOW (bug 223744)
     *outLibrary = PR_LoadLibraryWithFlags(libSpec, 0);
     pLibrary = *outLibrary;
 #endif
     if (!pLibrary) {
         LoadExtraSharedLibs();
         // try reload plugin once more
         *outLibrary = PR_LoadLibraryWithFlags(libSpec, 0);
         pLibrary = *outLibrary;
         if (!pLibrary) {
             DisplayPR_LoadLibraryErrorMessage(libSpec.value.pathname);
             return NS_ERROR_FAILURE;
         }
     }
 #else
     *outLibrary = PR_LoadLibraryWithFlags(libSpec, 0);
     pLibrary = *outLibrary;
 #endif  // MOZ_WIDGET_GTK2
 #ifdef DEBUG
     printf("LoadPlugin() %s returned %lx\n",
            libSpec.value.pathname, (unsigned long)pLibrary);
 #endif
     if (!pLibrary) {
         return NS_ERROR_FAILURE;
     }
     return NS_OK;
 }
 nsresult nsPluginFile::GetPluginInfo(nsPluginInfo& info, PRLibrary **outLibrary)
 {
     *outLibrary = nullptr;
     info.fVersion = nullptr;
     // Sadly we have to load the library for this to work.
     nsresult rv = LoadPlugin(outLibrary);
     if (NS_FAILED(rv))
         return rv;
     const char* (*npGetPluginVersion)() =
         (const char* (*)()) PR_FindFunctionSymbol(pLibrary, "NP_GetPluginVersion");
     if (npGetPluginVersion) {
         info.fVersion = PL_strdup(npGetPluginVersion());
     }
     const char* (*npGetMIMEDescription)() =
         (const char* (*)()) PR_FindFunctionSymbol(pLibrary, "NP_GetMIMEDescription");
     if (!npGetMIMEDescription) {
         return NS_ERROR_FAILURE;
     }
     const char* mimedescr = npGetMIMEDescription();
     if (!mimedescr) {
         return NS_ERROR_FAILURE;
     }
     rv = ParsePluginMimeDescription(mimedescr, info);
     if (NS_FAILED(rv)) {
         return rv;
     }
     nsAutoCString path;
     if (NS_FAILED(rv = mPlugin->GetNativePath(path)))
         return rv;
     info.fFullPath = PL_strdup(path.get());
     nsAutoCString fileName;
     if (NS_FAILED(rv = mPlugin->GetNativeLeafName(fileName)))
         return rv;
     info.fFileName = PL_strdup(fileName.get());
     NP_GetValueFunc npGetValue = (NP_GetValueFunc)PR_FindFunctionSymbol(pLibrary, "NP_GetValue");
     if (!npGetValue) {
         return NS_ERROR_FAILURE;
     }
     const char *name = nullptr;
     npGetValue(nullptr, NPPVpluginNameString, &name);
     if (name) {
         info.fName = PL_strdup(name);
     }
     else {
         info.fName = PL_strdup(fileName.get());
     }
     const char *description = nullptr;
     npGetValue(nullptr, NPPVpluginDescriptionString, &description);
     if (description) {
         info.fDescription = PL_strdup(description);
     }
     else {
         info.fDescription = PL_strdup("");
     }
     return NS_OK;
 }
 nsresult nsPluginFile::FreePluginInfo(nsPluginInfo& info)
 {
     if (info.fName != nullptr)
         PL_strfree(info.fName);
     if (info.fDescription != nullptr)
         PL_strfree(info.fDescription);
     for (uint32_t i = 0; i < info.fVariantCount; i++) {
         if (info.fMimeTypeArray[i] != nullptr)
             PL_strfree(info.fMimeTypeArray[i]);
         if (info.fMimeDescriptionArray[i] != nullptr)
             PL_strfree(info.fMimeDescriptionArray[i]);
         if (info.fExtensionArray[i] != nullptr)
             PL_strfree(info.fExtensionArray[i]);
     }
     PR_FREEIF(info.fMimeTypeArray);
     PR_FREEIF(info.fMimeDescriptionArray);
     PR_FREEIF(info.fExtensionArray);
     if (info.fFullPath != nullptr)
         PL_strfree(info.fFullPath);
     if (info.fFileName != nullptr)
         PL_strfree(info.fFileName);
     if (info.fVersion != nullptr)
         PL_strfree(info.fVersion);
     return NS_OK;
 }

The Tor Browser / annotate

dom/plugins/base/nsPluginsDirUnix.cpp@6474c204b198 (annotated)

dom/plugins/base/nsPluginsDirUnix.cpp