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       level = ASL_LEVEL_ERR;
  51       break;
  52     case logging::LOG_FATAL:
  53       level = ASL_LEVEL_EMERG;
  54       break;
  55     default:
  56       // 'notice' is the lowest priority that the asl libraries will log by
  57       // default.
  58       level = ASL_LEVEL_NOTICE;
  59       break;
  60   }
  61
  62   ScopedAslMsg asl_message(asl_new(ASL_TYPE_MSG));
  63   if (!asl_message.is_valid())
  64     return false;
  65
  66   if (asl_set(asl_message.get(), ASL_KEY_FACILITY,
  67               kChromotingLoggingFacility) != 0)
  68     return false;
  69
  70   if (asl_set(asl_message.get(), ASL_KEY_LEVEL,
  71               base::IntToString(level).c_str()) != 0)
  72     return false;
  73
  74   // Restrict read access to the message to root and the current user.
  75   if (asl_set(asl_message.get(), ASL_KEY_READ_UID,
  76               base::IntToString(geteuid()).c_str()) != 0)
  77     return false;
  78
  79   if (asl_set(asl_message.get(), ASL_KEY_MSG,
  80               message.c_str() + message_start) != 0)
  81     return false;
  82
  83   asl_send(nullptr, asl_message.get());
  84
  85   // Don't prevent message from being logged by traditional means.
  86   return false;
  87 }
  88
  89 }  // namespace
  90
  91 void InitHostLogging() {
  92   // Write logs to the system debug log.
  93   logging::LoggingSettings settings;
  94   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
  95   logging::InitLogging(settings);
  96
  97   // Write logs to syslog as well.
  98   logging::SetLogMessageHandler(LogMessageToAsl);
  99 }
 100
 101 }  // namespace remoting