remoting/host/logging_mac.cc

   1 // Copyright 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 "remoting/host/logging.h"
   6
   7 #include <asl.h>
   8 #include <sys/types.h>
   9 #include <unistd.h>
  10
  11 #include "base/logging.h"
  12 #include "base/scoped_generic.h"
  13 #include "base/strings/string_number_conversions.h"
  14
  15 namespace remoting {
  16
  17 namespace {
  18
  19 const char kChromotingLoggingFacility[] = "org.chromium.chromoting";
  20
  21 // Define a scoper for objects allocated by asl_new.
  22 struct ScopedAslMsgTraits {
  23   static aslmsg InvalidValue() {
  24     return nullptr;
  25   }
  26   static void Free(aslmsg msg) {
  27     asl_free(msg);
  28   }
  29 };
  30 typedef base::ScopedGeneric<aslmsg, ScopedAslMsgTraits> ScopedAslMsg;
  31
  32 // Logging message handler that writes to syslog.
  33 // The log can be obtained by running the following in a terminal:
  34 // syslog -k Facility org.chromium.chromoting
  35 bool LogMessageToAsl(
  36     logging::LogSeverity severity,
  37     const char* file,
  38     int line,
  39     size_t message_start,
  40     const std::string& message) {
  41   int level;
  42   switch(severity) {
  43     case logging::LOG_INFO:
  44       level = ASL_LEVEL_NOTICE;
  45       break;
  46     case logging::LOG_WARNING:
  47       level = ASL_LEVEL_WARNING;
  48       break;
  49     case logging::LOG_ERROR:
  50     case logging::LOG_FATAL:
  51       level = ASL_LEVEL_ERR;
  52       break;
  53     default:
  54       // 'notice' is the lowest priority that the asl libraries will log by
  55       // default.
  56       level = ASL_LEVEL_NOTICE;
  57       break;
  58   }
  59
  60   ScopedAslMsg asl_message(asl_new(ASL_TYPE_MSG));
  61   if (!asl_message.is_valid())
  62     return false;
  63
  64   if (asl_set(asl_message.get(), ASL_KEY_FACILITY,
  65               kChromotingLoggingFacility) != 0)
  66     return false;
  67
  68   if (asl_set(asl_message.get(), ASL_KEY_LEVEL,
  69               base::IntToString(level).c_str()) != 0)
  70     return false;
  71
  72   // Restrict read access to the message to root and the current user.
  73   if (asl_set(asl_message.get(), ASL_KEY_READ_UID,
  74               base::IntToString(geteuid()).c_str()) != 0)
  75     return false;
  76
  77   if (asl_set(asl_message.get(), ASL_KEY_MSG,
  78               message.c_str() + message_start) != 0)
  79     return false;
  80
  81   asl_send(nullptr, asl_message.get());
  82
  83   // Don't prevent message from being logged by traditional means.
  84   return false;
  85 }
  86
  87 }  // namespace
  88
  89 void InitHostLogging() {
  90   // Write logs to the system debug log.
  91   logging::LoggingSettings settings;
  92   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
  93   logging::InitLogging(settings);
  94
  95   // Write logs to syslog as well.
  96   logging::SetLogMessageHandler(LogMessageToAsl);
  97 }
  98
  99 }  // namespace remoting