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//
// RemoteSyslogListener.cpp
//
// $Id: //poco/1.4/Net/src/RemoteSyslogListener.cpp#4 $
//
// Library: Net
// Package: Logging
// Module: RemoteSyslogListener
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/Net/RemoteSyslogListener.h"
#include "Poco/Net/RemoteSyslogChannel.h"
#include "Poco/Net/DatagramSocket.h"
#include "Poco/Net/SocketAddress.h"
#include "Poco/Runnable.h"
#include "Poco/Notification.h"
#include "Poco/AutoPtr.h"
#include "Poco/NumberParser.h"
#include "Poco/NumberFormatter.h"
#include "Poco/DateTimeParser.h"
#include "Poco/Message.h"
#include "Poco/LoggingFactory.h"
#include "Poco/Buffer.h"
#include "Poco/Ascii.h"
#include <cstddef>
namespace Poco {
namespace Net {
//
// MessageNotification
//
class MessageNotification: public Poco::Notification
{
public:
MessageNotification(const char* buffer, std::size_t length, const Poco::Net::SocketAddress& sourceAddress):
_message(buffer, length),
_sourceAddress(sourceAddress)
{
}
MessageNotification(const std::string& message, const Poco::Net::SocketAddress& sourceAddress):
_message(message),
_sourceAddress(sourceAddress)
{
}
~MessageNotification()
{
}
const std::string& message() const
{
return _message;
}
const Poco::Net::SocketAddress& sourceAddress() const
{
return _sourceAddress;
}
private:
std::string _message;
Poco::Net::SocketAddress _sourceAddress;
};
//
// RemoteUDPListener
//
class RemoteUDPListener: public Poco::Runnable
{
public:
enum
{
WAITTIME_MILLISEC = 1000,
BUFFER_SIZE = 65536
};
RemoteUDPListener(Poco::NotificationQueue& queue, Poco::UInt16 port);
~RemoteUDPListener();
void run();
void safeStop();
private:
Poco::NotificationQueue& _queue;
DatagramSocket _socket;
bool _stopped;
};
RemoteUDPListener::RemoteUDPListener(Poco::NotificationQueue& queue, Poco::UInt16 port):
_queue(queue),
_socket(Poco::Net::SocketAddress(Poco::Net::IPAddress(), port)),
_stopped(false)
{
}
RemoteUDPListener::~RemoteUDPListener()
{
}
void RemoteUDPListener::run()
{
Poco::Buffer<char> buffer(BUFFER_SIZE);
Poco::Timespan waitTime(WAITTIME_MILLISEC* 1000);
while (!_stopped)
{
try
{
if (_socket.poll(waitTime, Socket::SELECT_READ))
{
Poco::Net::SocketAddress sourceAddress;
int n = _socket.receiveFrom(buffer.begin(), BUFFER_SIZE, sourceAddress);
if (n > 0)
{
_queue.enqueueNotification(new MessageNotification(buffer.begin(), n, sourceAddress));
}
}
}
catch (...)
{
// lazy exception catching
}
}
}
void RemoteUDPListener::safeStop()
{
_stopped = true;
}
//
// SyslogParser
//
class SyslogParser: public Poco::Runnable
{
public:
static const std::string NILVALUE;
enum
{
WAITTIME_MILLISEC = 1000
};
SyslogParser(Poco::NotificationQueue& queue, RemoteSyslogListener* pListener);
~SyslogParser();
void parse(const std::string& line, Poco::Message& message);
void run();
void safeStop();
static Poco::Message::Priority convert(RemoteSyslogChannel::Severity severity);
private:
void parsePrio(const std::string& line, std::size_t& pos, RemoteSyslogChannel::Severity& severity, RemoteSyslogChannel::Facility& fac);
void parseNew(const std::string& line, RemoteSyslogChannel::Severity severity, RemoteSyslogChannel::Facility fac, std::size_t& pos, Poco::Message& message);
void parseBSD(const std::string& line, RemoteSyslogChannel::Severity severity, RemoteSyslogChannel::Facility fac, std::size_t& pos, Poco::Message& message);
static std::string parseUntilSpace(const std::string& line, std::size_t& pos);
/// Parses until it encounters the next space char, returns the string from pos, excluding space
/// pos will point past the space char
private:
Poco::NotificationQueue& _queue;
bool _stopped;
RemoteSyslogListener* _pListener;
};
const std::string SyslogParser::NILVALUE("-");
SyslogParser::SyslogParser(Poco::NotificationQueue& queue, RemoteSyslogListener* pListener):
_queue(queue),
_stopped(false),
_pListener(pListener)
{
poco_check_ptr (_pListener);
}
SyslogParser::~SyslogParser()
{
}
void SyslogParser::run()
{
while (!_stopped)
{
try
{
Poco::AutoPtr<Poco::Notification> pNf(_queue.waitDequeueNotification(WAITTIME_MILLISEC));
if (pNf)
{
Poco::AutoPtr<MessageNotification> pMsgNf = pNf.cast<MessageNotification>();
Poco::Message message;
parse(pMsgNf->message(), message);
message["addr"] =pMsgNf->sourceAddress().host().toString();
_pListener->log(message);
}
}
catch (Poco::Exception&)
{
// parsing exception, what should we do?
}
catch (...)
{
}
}
}
void SyslogParser::safeStop()
{
_stopped = true;
}
void SyslogParser::parse(const std::string& line, Poco::Message& message)
{
// <int> -> int: lower 3 bits severity, upper bits: facility
std::size_t pos = 0;
RemoteSyslogChannel::Severity severity;
RemoteSyslogChannel::Facility fac;
parsePrio(line, pos, severity, fac);
// the next field decide if we parse an old BSD message or a new syslog message
// BSD: expects a month value in string form: Jan, Feb...
// SYSLOG expects a version number: 1
if (Poco::Ascii::isDigit(line[pos]))
{
parseNew(line, severity, fac, pos, message);
}
else
{
parseBSD(line, severity, fac, pos, message);
}
poco_assert (pos == line.size());
}
void SyslogParser::parsePrio(const std::string& line, std::size_t& pos, RemoteSyslogChannel::Severity& severity, RemoteSyslogChannel::Facility& fac)
{
poco_assert (pos < line.size());
poco_assert (line[pos] == '<');
++pos;
std::size_t start = pos;
while (pos < line.size() && Poco::Ascii::isDigit(line[pos]))
++pos;
poco_assert (line[pos] == '>');
poco_assert (pos - start > 0);
std::string valStr = line.substr(start, pos - start);
++pos; // skip the >
int val = Poco::NumberParser::parse(valStr);
poco_assert (val >= 0 && val <= (RemoteSyslogChannel::SYSLOG_LOCAL7 + RemoteSyslogChannel::SYSLOG_DEBUG));
Poco::UInt16 pri = static_cast<Poco::UInt16>(val);
// now get the lowest 3 bits
severity = static_cast<RemoteSyslogChannel::Severity>(pri & 0x0007u);
fac = static_cast<RemoteSyslogChannel::Facility>(pri & 0xfff8u);
}
void SyslogParser::parseNew(const std::string& line, RemoteSyslogChannel::Severity severity, RemoteSyslogChannel::Facility fac, std::size_t& pos, Poco::Message& message)
{
Poco::Message::Priority prio = convert(severity);
// rest of the unparsed header is:
// VERSION SP TIMESTAMP SP HOSTNAME SP APP-NAME SP PROCID SP MSGID
std::string versionStr(parseUntilSpace(line, pos));
std::string timeStr(parseUntilSpace(line, pos)); // can be the nilvalue!
std::string hostName(parseUntilSpace(line, pos));
std::string appName(parseUntilSpace(line, pos));
std::string procId(parseUntilSpace(line, pos));
std::string msgId(parseUntilSpace(line, pos));
std::string messageText(line.substr(pos));
pos = line.size();
Poco::DateTime date;
int tzd = 0;
bool hasDate = Poco::DateTimeParser::tryParse(RemoteSyslogChannel::SYSLOG_TIMEFORMAT, timeStr, date, tzd);
Poco::Message logEntry(msgId, messageText, prio);
logEntry[RemoteSyslogListener::LOG_PROP_HOST] = hostName;
logEntry[RemoteSyslogListener::LOG_PROP_APP] = appName;
if (hasDate)
logEntry.setTime(date.timestamp());
int lval(0);
Poco::NumberParser::tryParse(procId, lval);
logEntry.setPid(lval);
message.swap(logEntry);
}
void SyslogParser::parseBSD(const std::string& line, RemoteSyslogChannel::Severity severity, RemoteSyslogChannel::Facility fac, std::size_t& pos, Poco::Message& message)
{
Poco::Message::Priority prio = convert(severity);
// rest of the unparsed header is:
// "%b %f %H:%M:%S" SP hostname|ipaddress
// detect three spaces
int spaceCnt = 0;
std::size_t start = pos;
while (spaceCnt < 3 && pos < line.size())
{
if (line[pos] == ' ')
{
spaceCnt++;
if (spaceCnt == 1)
{
// size must be 3 chars for month
if (pos - start != 3)
{
// probably a shortened time value, or the hostname
// assume hostName
Poco::Message logEntry(line.substr(start, pos-start), line.substr(pos+1), prio);
message.swap(logEntry);
return;
}
}
else if (spaceCnt == 2)
{
// a day value!
if (!(Poco::Ascii::isDigit(line[pos-1]) && (Poco::Ascii::isDigit(line[pos-2]) || Poco::Ascii::isSpace(line[pos-2]))))
{
// assume the next field is a hostname
spaceCnt = 3;
}
}
if (pos + 1 < line.size() && line[pos+1] == ' ')
{
// we have two spaces when the day value is smaller than 10!
++pos; // skip one
}
}
++pos;
}
std::string timeStr(line.substr(start, pos-start-1));
int tzd(0);
Poco::DateTime date;
int year = date.year(); // year is not included, use the current one
bool hasDate = Poco::DateTimeParser::tryParse(RemoteSyslogChannel::BSD_TIMEFORMAT, timeStr, date, tzd);
if (hasDate)
{
int m = date.month();
int d = date.day();
int h = date.hour();
int min = date.minute();
int sec = date.second();
date = Poco::DateTime(year, m, d, h, min, sec);
}
// next entry is host SP
std::string hostName(parseUntilSpace(line, pos));
// TAG: at most 32 alphanumeric chars, ANY non alphannumeric indicates start of message content
// ignore: treat everything as content
std::string messageText(line.substr(pos));
pos = line.size();
Poco::Message logEntry(hostName, messageText, prio);
logEntry.setTime(date.timestamp());
message.swap(logEntry);
}
std::string SyslogParser::parseUntilSpace(const std::string& line, std::size_t& pos)
{
std::size_t start = pos;
while (pos < line.size() && !Poco::Ascii::isSpace(line[pos]))
++pos;
// skip space
++pos;
return line.substr(start, pos-start-1);
}
Poco::Message::Priority SyslogParser::convert(RemoteSyslogChannel::Severity severity)
{
switch (severity)
{
case RemoteSyslogChannel::SYSLOG_EMERGENCY:
return Poco::Message::PRIO_FATAL;
case RemoteSyslogChannel::SYSLOG_ALERT:
return Poco::Message::PRIO_FATAL;
case RemoteSyslogChannel::SYSLOG_CRITICAL:
return Poco::Message::PRIO_CRITICAL;
case RemoteSyslogChannel::SYSLOG_ERROR:
return Poco::Message::PRIO_ERROR;
case RemoteSyslogChannel::SYSLOG_WARNING:
return Poco::Message::PRIO_WARNING;
case RemoteSyslogChannel::SYSLOG_NOTICE:
return Poco::Message::PRIO_NOTICE;
case RemoteSyslogChannel::SYSLOG_INFORMATIONAL:
return Poco::Message::PRIO_INFORMATION;
case RemoteSyslogChannel::SYSLOG_DEBUG:
return Poco::Message::PRIO_DEBUG;
}
throw Poco::LogicException("Illegal severity value in message");
}
//
// RemoteSyslogListener
//
const std::string RemoteSyslogListener::PROP_PORT("port");
const std::string RemoteSyslogListener::PROP_THREADS("threads");
const std::string RemoteSyslogListener::LOG_PROP_APP("app");
const std::string RemoteSyslogListener::LOG_PROP_HOST("host");
RemoteSyslogListener::RemoteSyslogListener():
_pListener(0),
_pParser(0),
_port(RemoteSyslogChannel::SYSLOG_PORT),
_threads(1)
{
}
RemoteSyslogListener::RemoteSyslogListener(Poco::UInt16 port):
_pListener(0),
_pParser(0),
_port(port),
_threads(1)
{
}
RemoteSyslogListener::RemoteSyslogListener(Poco::UInt16 port, int threads):
_pListener(0),
_pParser(0),
_port(port),
_threads(threads)
{
}
RemoteSyslogListener::~RemoteSyslogListener()
{
}
void RemoteSyslogListener::processMessage(const std::string& messageText)
{
Poco::Message message;
_pParser->parse(messageText, message);
log(message);
}
void RemoteSyslogListener::enqueueMessage(const std::string& messageText, const Poco::Net::SocketAddress& senderAddress)
{
_queue.enqueueNotification(new MessageNotification(messageText, senderAddress));
}
void RemoteSyslogListener::setProperty(const std::string& name, const std::string& value)
{
if (name == PROP_PORT)
{
int val = Poco::NumberParser::parse(value);
if (val >= 0 && val < 65536)
_port = static_cast<Poco::UInt16>(val);
else
throw Poco::InvalidArgumentException("Not a valid port number", value);
}
else if (name == PROP_THREADS)
{
int val = Poco::NumberParser::parse(value);
if (val > 0 && val < 16)
_threads = val;
else
throw Poco::InvalidArgumentException("Invalid number of threads", value);
}
else
{
SplitterChannel::setProperty(name, value);
}
}
std::string RemoteSyslogListener::getProperty(const std::string& name) const
{
if (name == PROP_PORT)
return Poco::NumberFormatter::format(_port);
else if (name == PROP_THREADS)
return Poco::NumberFormatter::format(_threads);
else
return SplitterChannel::getProperty(name);
}
void RemoteSyslogListener::open()
{
SplitterChannel::open();
_pParser = new SyslogParser(_queue, this);
if (_port > 0)
{
_pListener = new RemoteUDPListener(_queue, _port);
}
for (int i = 0; i < _threads; i++)
{
_threadPool.start(*_pParser);
}
if (_pListener)
{
_threadPool.start(*_pListener);
}
}
void RemoteSyslogListener::close()
{
if (_pListener)
{
_pListener->safeStop();
}
if (_pParser)
{
_pParser->safeStop();
}
_queue.clear();
_threadPool.joinAll();
delete _pListener;
delete _pParser;
_pListener = 0;
_pParser = 0;
SplitterChannel::close();
}
void RemoteSyslogListener::registerChannel()
{
Poco::LoggingFactory::defaultFactory().registerChannelClass("RemoteSyslogListener", new Poco::Instantiator<RemoteSyslogListener, Poco::Channel>);
}
} } // namespace Poco::Net