// Copyright (c) 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "client/windows/crash_generation/minidump_generator.h"
#include <cassert>
#include "client/windows/common/auto_critical_section.h"
#include "common/windows/guid_string.h"

using std::wstring;

namespace google_breakpad {

MinidumpGenerator::MinidumpGenerator(const wstring& dump_path)
    : dbghelp_module_(NULL),
      rpcrt4_module_(NULL),
      dump_path_(dump_path),
      write_dump_(NULL),
      create_uuid_(NULL) {
  InitializeCriticalSection(&module_load_sync_);
  InitializeCriticalSection(&get_proc_address_sync_);
}

MinidumpGenerator::~MinidumpGenerator() {
  if (dbghelp_module_) {
    FreeLibrary(dbghelp_module_);
  }

  if (rpcrt4_module_) {
    FreeLibrary(rpcrt4_module_);
  }

  DeleteCriticalSection(&get_proc_address_sync_);
  DeleteCriticalSection(&module_load_sync_);
}

bool MinidumpGenerator::WriteMinidump(HANDLE process_handle,
                                      DWORD process_id,
                                      DWORD thread_id,
                                      DWORD requesting_thread_id,
                                      EXCEPTION_POINTERS* exception_pointers,
                                      MDRawAssertionInfo* assert_info,
                                      MINIDUMP_TYPE dump_type,
                                      bool is_client_pointers) {
  MiniDumpWriteDumpType write_dump = GetWriteDump();
  if (!write_dump) {
    return false;
  }

  wstring dump_file_path;
  if (!GenerateDumpFilePath(&dump_file_path)) {
    return false;
  }

  HANDLE dump_file = CreateFile(dump_file_path.c_str(),
                                GENERIC_WRITE,
                                0,
                                NULL,
                                CREATE_NEW,
                                FILE_ATTRIBUTE_NORMAL,
                                NULL);

  if (dump_file == INVALID_HANDLE_VALUE) {
    return false;
  }

  MINIDUMP_EXCEPTION_INFORMATION* dump_exception_pointers = NULL;
  MINIDUMP_EXCEPTION_INFORMATION dump_exception_info;

  // Setup the exception information object only if it's a dump
  // due to an exception.
  if (exception_pointers) {
    dump_exception_pointers = &dump_exception_info;
    dump_exception_info.ThreadId = thread_id;
    dump_exception_info.ExceptionPointers = exception_pointers;
    dump_exception_info.ClientPointers = is_client_pointers;
  }

  // Add an MDRawBreakpadInfo stream to the minidump, to provide additional
  // information about the exception handler to the Breakpad processor.
  // The information will help the processor determine which threads are
  // relevant. The Breakpad processor does not require this information but
  // can function better with Breakpad-generated dumps when it is present.
  // The native debugger is not harmed by the presence of this information.
  MDRawBreakpadInfo breakpad_info;
  breakpad_info.validity = MD_BREAKPAD_INFO_VALID_DUMP_THREAD_ID |
                           MD_BREAKPAD_INFO_VALID_REQUESTING_THREAD_ID;
  breakpad_info.dump_thread_id = thread_id;
  breakpad_info.requesting_thread_id = requesting_thread_id;

  // Leave room in user_stream_array for a possible assertion info stream.
  MINIDUMP_USER_STREAM user_stream_array[2];
  user_stream_array[0].Type = MD_BREAKPAD_INFO_STREAM;
  user_stream_array[0].BufferSize = sizeof(breakpad_info);
  user_stream_array[0].Buffer = &breakpad_info;

  MINIDUMP_USER_STREAM_INFORMATION user_streams;
  user_streams.UserStreamCount = 1;
  user_streams.UserStreamArray = user_stream_array;

  MDRawAssertionInfo* actual_assert_info = assert_info;
  MDRawAssertionInfo client_assert_info = {0};

  if (assert_info) {
    // If the assertion info object lives in the client process,
    // read the memory of the client process.
    if (is_client_pointers) {
      SIZE_T bytes_read = 0;
      if (!ReadProcessMemory(process_handle,
                             assert_info,
                             &client_assert_info,
                             sizeof(client_assert_info),
                             &bytes_read)) {
        CloseHandle(dump_file);
        return false;
      }

      if (bytes_read != sizeof(client_assert_info)) {
        CloseHandle(dump_file);
        return false;
      }

      actual_assert_info  = &client_assert_info;
    }

    user_stream_array[1].Type = MD_ASSERTION_INFO_STREAM;
    user_stream_array[1].BufferSize = sizeof(MDRawAssertionInfo);
    user_stream_array[1].Buffer = actual_assert_info;
    ++user_streams.UserStreamCount;
  }

  bool result = write_dump(process_handle,
                           process_id,
                           dump_file,
                           dump_type,
                           exception_pointers ? &dump_exception_info : NULL,
                           &user_streams,
                           NULL) != FALSE;

  CloseHandle(dump_file);
  return result;
}

HMODULE MinidumpGenerator::GetDbghelpModule() {
  AutoCriticalSection lock(&module_load_sync_);
  if (!dbghelp_module_) {
    dbghelp_module_ = LoadLibrary(TEXT("dbghelp.dll"));
  }

  return dbghelp_module_;
}

MinidumpGenerator::MiniDumpWriteDumpType MinidumpGenerator::GetWriteDump() {
  AutoCriticalSection lock(&get_proc_address_sync_);
  if (!write_dump_) {
    HMODULE module = GetDbghelpModule();
    if (module) {
      FARPROC proc = GetProcAddress(module, "MiniDumpWriteDump");
      write_dump_ = reinterpret_cast<MiniDumpWriteDumpType>(proc);
    }
  }

  return write_dump_;
}

HMODULE MinidumpGenerator::GetRpcrt4Module() {
  AutoCriticalSection lock(&module_load_sync_);
  if (!rpcrt4_module_) {
    rpcrt4_module_ = LoadLibrary(TEXT("rpcrt4.dll"));
  }

  return rpcrt4_module_;
}

MinidumpGenerator::UuidCreateType MinidumpGenerator::GetCreateUuid() {
  AutoCriticalSection lock(&module_load_sync_);
  if (!create_uuid_) {
    HMODULE module = GetRpcrt4Module();
    if (module) {
      FARPROC proc = GetProcAddress(module, "UuidCreate");
      create_uuid_ = reinterpret_cast<UuidCreateType>(proc);
    }
  }

  return create_uuid_;
}

bool MinidumpGenerator::GenerateDumpFilePath(wstring* file_path) {
  UUID id = {0};

  UuidCreateType create_uuid = GetCreateUuid();
  if(!create_uuid) {
    return false;
  }

  create_uuid(&id);
  wstring id_str = GUIDString::GUIDToWString(&id);

  *file_path = dump_path_ + TEXT("\\") + id_str + TEXT(".dmp");
  return true;
}

}  // namespace google_breakpad
