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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/mac/sandbox_logging.h"
#include <asl.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <limits>
#include <string>
#define ABORT() \
{ \
asm volatile( \
"int3; ud2; push %0;" ::"i"(static_cast<unsigned char>(__COUNTER__))); \
__builtin_unreachable(); \
}
extern "C" {
void abort_report_np(const char*, ...);
}
namespace sandbox {
namespace logging {
namespace {
enum class Level { FATAL, ERR, WARN, INFO };
void SendAslLog(Level level, const char* message) {
class ASLClient {
public:
explicit ASLClient()
: client_(asl_open(nullptr,
"com.apple.console",
ASL_OPT_STDERR | ASL_OPT_NO_DELAY)) {}
~ASLClient() { asl_close(client_); }
aslclient get() const { return client_; }
ASLClient(const ASLClient&) = delete;
ASLClient& operator=(const ASLClient&) = delete;
private:
aslclient client_;
} asl_client;
class ASLMessage {
public:
ASLMessage() : message_(asl_new(ASL_TYPE_MSG)) {}
~ASLMessage() { asl_free(message_); }
aslmsg get() const { return message_; }
ASLMessage(const ASLMessage&) = delete;
ASLMessage& operator=(const ASLMessage&) = delete;
private:
aslmsg message_;
} asl_message;
// By default, messages are only readable by the admin group. Explicitly
// make them readable by the user generating the messages.
char euid_string[12];
snprintf(euid_string, sizeof(euid_string) / sizeof(euid_string[0]), "%d",
geteuid());
asl_set(asl_message.get(), ASL_KEY_READ_UID, euid_string);
std::string asl_level_string;
switch (level) {
case Level::FATAL:
asl_level_string = ASL_STRING_CRIT;
break;
case Level::ERR:
asl_level_string = ASL_STRING_ERR;
break;
case Level::WARN:
asl_level_string = ASL_STRING_WARNING;
break;
case Level::INFO:
default:
asl_level_string = ASL_STRING_INFO;
break;
}
asl_set(asl_message.get(), ASL_KEY_LEVEL, asl_level_string.c_str());
asl_set(asl_message.get(), ASL_KEY_MSG, message);
asl_send(asl_client.get(), asl_message.get());
if (__builtin_available(macOS 10.11, *)) {
if (level == Level::FATAL) {
abort_report_np(message);
}
}
}
// |error| is strerror(errno) when a P* logging function is called. Pass
// |nullptr| if no errno is set.
void DoLogging(Level level,
const char* fmt,
va_list args,
const std::string* error) {
char message[4096];
int ret = vsnprintf(message, sizeof(message), fmt, args);
if (ret < 0) {
SendAslLog(level, "warning: log message could not be formatted");
return;
}
// int |ret| is not negative so casting to a larger type is safe.
bool truncated = static_cast<unsigned long>(ret) > sizeof(message) - 1;
std::string final_message = message;
if (error)
final_message += ": " + *error;
SendAslLog(level, final_message.c_str());
if (truncated)
SendAslLog(level, "warning: previous log message truncated");
}
} // namespace
void Info(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
DoLogging(Level::INFO, fmt, args, nullptr);
va_end(args);
}
void Warning(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
DoLogging(Level::WARN, fmt, args, nullptr);
va_end(args);
}
void Error(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
DoLogging(Level::ERR, fmt, args, nullptr);
va_end(args);
}
void Fatal(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
DoLogging(Level::FATAL, fmt, args, nullptr);
va_end(args);
ABORT();
}
void PError(const char* fmt, ...) {
std::string error = strerror(errno);
va_list args;
va_start(args, fmt);
DoLogging(Level::ERR, fmt, args, &error);
va_end(args);
}
void PFatal(const char* fmt, ...) {
std::string error = strerror(errno);
va_list args;
va_start(args, fmt);
DoLogging(Level::FATAL, fmt, args, &error);
va_end(args);
ABORT();
}
} // namespace logging
} // namespace sandbox
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