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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <log4cxx/net/telnetappender.h>
#include <log4cxx/helpers/loglog.h>
#include <log4cxx/helpers/optionconverter.h>
#include <log4cxx/helpers/stringhelper.h>
#include <log4cxx/helpers/synchronized.h>
#include <apr_thread_proc.h>
#include <apr_atomic.h>
#include <apr_strings.h>
#include <log4cxx/helpers/charsetencoder.h>
#include <log4cxx/helpers/bytebuffer.h>
using namespace log4cxx;
using namespace log4cxx::helpers;
using namespace log4cxx::net;
#if APR_HAS_THREADS
IMPLEMENT_LOG4CXX_OBJECT(TelnetAppender)
/** The default telnet server port */
const int TelnetAppender::DEFAULT_PORT = 23;
/** The maximum number of concurrent connections */
const int TelnetAppender::MAX_CONNECTIONS = 20;
TelnetAppender::TelnetAppender()
: port(DEFAULT_PORT), connections(MAX_CONNECTIONS),
encoding(LOG4CXX_STR("UTF-8")),
encoder(CharsetEncoder::getUTF8Encoder()),
serverSocket(NULL), sh()
{
synchronized sync(mutex);
activeConnections = 0;
}
TelnetAppender::~TelnetAppender()
{
finalize();
delete serverSocket;
}
void TelnetAppender::activateOptions(Pool& /* p */)
{
if (serverSocket == NULL) {
serverSocket = new ServerSocket(port);
serverSocket->setSoTimeout(1000);
}
sh.run(acceptConnections, this);
}
void TelnetAppender::setOption(const LogString& option,
const LogString& value)
{
if (StringHelper::equalsIgnoreCase(option, LOG4CXX_STR("PORT"), LOG4CXX_STR("port")))
{
setPort(OptionConverter::toInt(value, DEFAULT_PORT));
}
else if (StringHelper::equalsIgnoreCase(option, LOG4CXX_STR("ENCODING"), LOG4CXX_STR("encoding")))
{
setEncoding(value);
}
else
{
AppenderSkeleton::setOption(option, value);
}
}
LogString TelnetAppender::getEncoding() const {
synchronized sync(mutex);
return encoding;
}
void TelnetAppender::setEncoding(const LogString& value) {
synchronized sync(mutex);
encoder = CharsetEncoder::getEncoder(value);
encoding = value;
}
void TelnetAppender::close()
{
synchronized sync(mutex);
if (closed) return;
closed = true;
SocketPtr nullSocket;
for(ConnectionList::iterator iter = connections.begin();
iter != connections.end();
iter++) {
if (*iter != 0) {
(*iter)->close();
*iter = nullSocket;
}
}
if (serverSocket != NULL) {
try {
serverSocket->close();
} catch(Exception&) {
}
}
try {
sh.join();
} catch(Exception& ex) {
}
activeConnections = 0;
}
void TelnetAppender::write(ByteBuffer& buf) {
for (ConnectionList::iterator iter = connections.begin();
iter != connections.end();
iter++) {
if (*iter != 0) {
try {
ByteBuffer b(buf.current(), buf.remaining());
(*iter)->write(b);
} catch(Exception& ex) {
// The client has closed the connection, remove it from our list:
*iter = 0;
activeConnections--;
}
}
}
}
void TelnetAppender::writeStatus(const SocketPtr& socket, const LogString& msg, Pool& p) {
size_t bytesSize = msg.size() * 2;
char* bytes = p.pstralloc(bytesSize);
LogString::const_iterator msgIter(msg.begin());
ByteBuffer buf(bytes, bytesSize);
while(msgIter != msg.end()) {
encoder->encode(msg, msgIter, buf);
buf.flip();
socket->write(buf);
buf.clear();
}
}
void TelnetAppender::append(const spi::LoggingEventPtr& event, Pool& p)
{
size_t count = activeConnections;
if (count > 0) {
LogString msg;
this->layout->format(msg, event, pool);
msg.append(LOG4CXX_STR("\r\n"));
size_t bytesSize = msg.size() * 2;
char* bytes = p.pstralloc(bytesSize);
LogString::const_iterator msgIter(msg.begin());
ByteBuffer buf(bytes, bytesSize);
synchronized sync(this->mutex);
while(msgIter != msg.end()) {
log4cxx_status_t stat = encoder->encode(msg, msgIter, buf);
buf.flip();
write(buf);
buf.clear();
if (CharsetEncoder::isError(stat)) {
LogString unrepresented(1, 0x3F /* '?' */);
LogString::const_iterator unrepresentedIter(unrepresented.begin());
stat = encoder->encode(unrepresented, unrepresentedIter, buf);
buf.flip();
write(buf);
buf.clear();
msgIter++;
}
}
}
}
void* APR_THREAD_FUNC TelnetAppender::acceptConnections(apr_thread_t* /* thread */, void* data) {
TelnetAppender* pThis = (TelnetAppender*) data;
// main loop; is left when This->closed is != 0 after an accept()
while(true)
{
try
{
SocketPtr newClient = pThis->serverSocket->accept();
bool done = pThis->closed;
if (done) {
Pool p;
pThis->writeStatus(newClient, LOG4CXX_STR("Log closed.\r\n"), p);
newClient->close();
return NULL;
}
size_t count = pThis->activeConnections;
if (count >= pThis->connections.size()) {
Pool p;
pThis->writeStatus(newClient, LOG4CXX_STR("Too many connections.\r\n"), p);
newClient->close();
} else {
//
// find unoccupied connection
//
synchronized sync(pThis->mutex);
for(ConnectionList::iterator iter = pThis->connections.begin();
iter != pThis->connections.end();
iter++) {
if (*iter == NULL) {
*iter = newClient;
pThis->activeConnections++;
break;
}
}
Pool p;
LogString oss(LOG4CXX_STR("TelnetAppender v1.0 ("));
StringHelper::toString((int) count+1, p, oss);
oss += LOG4CXX_STR(" active connections)\r\n\r\n");
pThis->writeStatus(newClient, oss, p);
}
} catch(InterruptedIOException &e) {
if (pThis->closed) {
return NULL;
}
} catch(Exception& e) {
if (!pThis->closed) {
LogLog::error(LOG4CXX_STR("Encountered error while in SocketHandler loop."), e);
} else {
return NULL;
}
}
}
return NULL;
}
#endif
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