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      1 // Copyright (c) 2011 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 "chrome/browser/crash_upload_list_win.h"
      6 
      7 #include "base/stringprintf.h"
      8 #include "base/string_util.h"
      9 #include "base/sys_string_conversions.h"
     10 
     11 CrashUploadListWin::CrashUploadListWin(Delegate* delegate)
     12     : CrashUploadList(delegate) {}
     13 
     14 void CrashUploadListWin::LoadCrashList() {
     15   std::vector<uint8> buffer(1024);
     16   HANDLE event_log = OpenEventLog(NULL, L"Application");
     17   if (event_log) {
     18     while (true) {
     19       DWORD bytes_read;
     20       DWORD bytes_needed;
     21       BOOL success =
     22           ReadEventLog(event_log,
     23                        EVENTLOG_SEQUENTIAL_READ | EVENTLOG_BACKWARDS_READ,
     24                        0,
     25                        &buffer[0],
     26                        buffer.size(),
     27                        &bytes_read,
     28                        &bytes_needed);
     29       if (success) {
     30         DWORD record_offset = 0;
     31         // The ReadEventLog() API docs imply, but do not explicitly state that
     32         // partial records will not be returned. Use DCHECK() to affirm this.
     33         while (record_offset < bytes_read) {
     34           DCHECK(record_offset + sizeof(EVENTLOGRECORD) <= bytes_read);
     35           EVENTLOGRECORD* record = (EVENTLOGRECORD*)&buffer[record_offset];
     36           DCHECK(record_offset + record->Length <= bytes_read);
     37           if (IsPossibleCrashLogRecord(record))
     38             ProcessPossibleCrashLogRecord(record);
     39           record_offset += record->Length;
     40         }
     41       } else if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
     42         // Resize buffer to the required minimum size.
     43         buffer.resize(bytes_needed);
     44       } else {
     45         // Stop on any other error, including the expected case
     46         // of ERROR_HANDLE_EOF.
     47         DCHECK(GetLastError() == ERROR_HANDLE_EOF);
     48         break;
     49       }
     50     }
     51     CloseEventLog(event_log);
     52   }
     53 }
     54 
     55 bool CrashUploadListWin::IsPossibleCrashLogRecord(
     56     EVENTLOGRECORD* record) const {
     57   LPWSTR provider_name = (LPWSTR)((uint8*)record + sizeof(EVENTLOGRECORD));
     58   return !wcscmp(L"Chrome", provider_name) &&
     59       record->EventType == EVENTLOG_INFORMATION_TYPE &&
     60       record->NumStrings >= 1;
     61 }
     62 
     63 void CrashUploadListWin::ProcessPossibleCrashLogRecord(EVENTLOGRECORD* record) {
     64   // Add the crash if the message matches the expected pattern.
     65   const std::wstring pattern_prefix(L"Id=");
     66   const std::wstring pattern_suffix(L".");
     67   std::wstring message((LPWSTR)((uint8*)record + record->StringOffset));
     68   size_t start_index = message.find(pattern_prefix);
     69   if (start_index != std::wstring::npos) {
     70     start_index += pattern_prefix.size();
     71     size_t end_index = message.find(pattern_suffix, start_index);
     72     if (end_index != std::wstring::npos) {
     73       std::wstring crash_id =
     74           message.substr(start_index, end_index - start_index);
     75       crashes().push_back(
     76           CrashInfo(base::SysWideToUTF8(crash_id),
     77                     base::Time::FromDoubleT(record->TimeGenerated)));
     78     }
     79   }
     80 }
     81