chrome/common/external_ipc_dumper.cc

   1 // Copyright (c) 2015 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/files/file_path.h"
   6 #include "base/logging.h"
   7 #include "base/native_library.h"
   8 #include "base/path_service.h"
   9 #include "chrome/common/external_ipc_dumper.h"
  10
  11 typedef IPC::ChannelProxy::OutgoingMessageFilter* (*GetFilterFunction)();
  12 typedef void (*SetDumpDirectoryFunction)(const base::FilePath&);
  13
  14 const char kFilterEntryName[] = "GetFilter";
  15 const char kSetDumpDirectoryEntryName[] = "SetDumpDirectory";
  16
  17 #if defined(OS_WIN)
  18 #define IPC_MESSAGE_DUMP_MODULE FILE_PATH_LITERAL("ipc_message_dump.dll")
  19 #else
  20 #define IPC_MESSAGE_DUMP_MODULE FILE_PATH_LITERAL("libipc_message_dump.so")
  21 #endif
  22
  23 IPC::ChannelProxy::OutgoingMessageFilter* LoadExternalIPCDumper(
  24     const base::FilePath& dump_directory) {
  25   base::FilePath module_path;
  26   if (!PathService::Get(base::DIR_MODULE, &module_path)) {
  27     LOG(ERROR) << "Unable to get message dump module directory.";
  28     return NULL;
  29   }
  30
  31   base::FilePath library_path = module_path.Append(IPC_MESSAGE_DUMP_MODULE);
  32   base::NativeLibraryLoadError load_error;
  33   base::NativeLibrary library =
  34       base::LoadNativeLibrary(library_path, &load_error);
  35
  36   if (!library) {
  37     LOG(ERROR) << load_error.ToString();
  38     return NULL;
  39   }
  40
  41   SetDumpDirectoryFunction set_directory_entry_point =
  42       reinterpret_cast<SetDumpDirectoryFunction>(
  43           base::GetFunctionPointerFromNativeLibrary(
  44               library, kSetDumpDirectoryEntryName));
  45   if (!set_directory_entry_point) {
  46     LOG(ERROR) << kSetDumpDirectoryEntryName
  47                << " not exported by message dump module.";
  48     return NULL;
  49   }
  50   set_directory_entry_point(dump_directory);
  51
  52   GetFilterFunction filter_entry_point = reinterpret_cast<GetFilterFunction>(
  53       base::GetFunctionPointerFromNativeLibrary(library, kFilterEntryName));
  54   if (!filter_entry_point) {
  55     LOG(ERROR) << kFilterEntryName << " not exported by message dump module.";
  56     return NULL;
  57   }
  58
  59   return filter_entry_point();
  60 }