content/common/pepper_plugin_list.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 "content/common/pepper_plugin_list.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/command_line.h"
   9 #include "base/files/file_util.h"
  10 #include "base/strings/string_split.h"
  11 #include "base/strings/string_util.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "content/public/common/content_client.h"
  14 #include "content/public/common/content_switches.h"
  15 #include "content/public/common/pepper_plugin_info.h"
  16 #include "ppapi/shared_impl/ppapi_permissions.h"
  17
  18 namespace content {
  19 namespace {
  20
  21 // The maximum number of plugins allowed to be registered from command line.
  22 const size_t kMaxPluginsToRegisterFromCommandLine = 64;
  23
  24 // Appends any plugins from the command line to the given vector.
  25 void ComputePluginsFromCommandLine(std::vector<PepperPluginInfo>* plugins) {
  26   // On Linux, once we're sandboxed, we can't know if a plugin is available or
  27   // not. But (on Linux) this function is always called once before we're
  28   // sandboxed. So when this function is called for the first time we set a
  29   // flag if the plugin file is available. Then we can skip the check on file
  30   // existence in subsequent calls if the flag is set.
  31   // NOTE: In theory we could have unlimited number of plugins registered in
  32   // command line. But in practice, 64 plugins should be more than enough.
  33   static uint64 skip_file_check_flags = 0;
  34   static_assert(
  35       kMaxPluginsToRegisterFromCommandLine <= sizeof(skip_file_check_flags) * 8,
  36       "max plugins to register from command line exceeds limit");
  37
  38   bool out_of_process = true;
  39   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
  40           switches::kPpapiInProcess))
  41     out_of_process = false;
  42
  43   const std::string value =
  44       base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
  45           switches::kRegisterPepperPlugins);
  46   if (value.empty())
  47     return;
  48
  49   // FORMAT:
  50   // command-line = <plugin-entry> + *( LWS + "," + LWS + <plugin-entry> )
  51   // plugin-entry =
  52   //    <file-path> +
  53   //    ["#" + <name> + ["#" + <description> + ["#" + <version>]]] +
  54   //    *1( LWS + ";" + LWS + <mime-type> )
  55   std::vector<std::string> modules;
  56   base::SplitString(value, ',', &modules);
  57
  58   size_t plugins_to_register = modules.size();
  59   if (plugins_to_register > kMaxPluginsToRegisterFromCommandLine) {
  60     DVLOG(1) << plugins_to_register << " pepper plugins registered from"
  61              << " command line which exceeds the limit (maximum "
  62              << kMaxPluginsToRegisterFromCommandLine << " plugins allowed)";
  63     plugins_to_register = kMaxPluginsToRegisterFromCommandLine;
  64   }
  65
  66   for (size_t i = 0; i < plugins_to_register; ++i) {
  67     std::vector<std::string> parts;
  68     base::SplitString(modules[i], ';', &parts);
  69     if (parts.size() < 2) {
  70       DVLOG(1) << "Required mime-type not found";
  71       continue;
  72     }
  73
  74     std::vector<std::string> name_parts;
  75     base::SplitString(parts[0], '#', &name_parts);
  76
  77     PepperPluginInfo plugin;
  78     plugin.is_out_of_process = out_of_process;
  79 #if defined(OS_WIN)
  80     // This means we can't provide plugins from non-ASCII paths, but
  81     // since this switch is only for development I don't think that's
  82     // too awful.
  83     plugin.path = base::FilePath(base::ASCIIToUTF16(name_parts[0]));
  84 #else
  85     plugin.path = base::FilePath(name_parts[0]);
  86 #endif
  87
  88     uint64 index_mask = 1ULL << i;
  89     if (!(skip_file_check_flags & index_mask)) {
  90       if (base::PathExists(plugin.path)) {
  91         skip_file_check_flags |= index_mask;
  92       } else {
  93         DVLOG(1) << "Plugin doesn't exist: " << plugin.path.MaybeAsASCII();
  94         continue;
  95       }
  96     }
  97
  98     if (name_parts.size() > 1)
  99       plugin.name = name_parts[1];
 100     if (name_parts.size() > 2)
 101       plugin.description = name_parts[2];
 102     if (name_parts.size() > 3)
 103       plugin.version = name_parts[3];
 104     for (size_t j = 1; j < parts.size(); ++j) {
 105       WebPluginMimeType mime_type(parts[j],
 106                                   std::string(),
 107                                   plugin.description);
 108       plugin.mime_types.push_back(mime_type);
 109     }
 110
 111     // If the plugin name is empty, use the filename.
 112     if (plugin.name.empty()) {
 113       plugin.name =
 114           base::UTF16ToUTF8(plugin.path.BaseName().LossyDisplayName());
 115     }
 116
 117     // Command-line plugins get full permissions.
 118     plugin.permissions = ppapi::PERMISSION_ALL_BITS;
 119
 120     plugins->push_back(plugin);
 121   }
 122 }
 123
 124 }  // namespace
 125
 126 bool MakePepperPluginInfo(const WebPluginInfo& webplugin_info,
 127                           PepperPluginInfo* pepper_info) {
 128   if (!webplugin_info.is_pepper_plugin())
 129     return false;
 130
 131   pepper_info->is_out_of_process =
 132       webplugin_info.type == WebPluginInfo::PLUGIN_TYPE_PEPPER_OUT_OF_PROCESS;
 133
 134   pepper_info->path = base::FilePath(webplugin_info.path);
 135   pepper_info->name = base::UTF16ToASCII(webplugin_info.name);
 136   pepper_info->description = base::UTF16ToASCII(webplugin_info.desc);
 137   pepper_info->version = base::UTF16ToASCII(webplugin_info.version);
 138   pepper_info->mime_types = webplugin_info.mime_types;
 139   pepper_info->permissions = webplugin_info.pepper_permissions;
 140
 141   return true;
 142 }
 143
 144 void ComputePepperPluginList(std::vector<PepperPluginInfo>* plugins) {
 145   GetContentClient()->AddPepperPlugins(plugins);
 146   ComputePluginsFromCommandLine(plugins);
 147 }
 148
 149 }  // namespace content