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#ifndef SOCKETPROXY_H
#define SOCKETPROXY_H
/*
* 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 "qpid/sys/IOHandle.h"
#ifdef _WIN32
# include "qpid/sys/windows/IoHandlePrivate.h"
typedef SOCKET FdType;
#else
# include "qpid/sys/posix/PrivatePosix.h"
typedef int FdType;
#endif
#include "qpid/sys/Socket.h"
#include "qpid/sys/Runnable.h"
#include "qpid/sys/Thread.h"
#include "qpid/sys/Mutex.h"
#include "qpid/log/Statement.h"
#include <boost/lexical_cast.hpp>
namespace qpid {
namespace tests {
/**
* A simple socket proxy that forwards to another socket.
* Used between client & local broker to simulate network failures.
*/
class SocketProxy : private qpid::sys::Runnable
{
// Need a Socket we can get the fd from
class LowSocket : public qpid::sys::Socket {
public:
#ifdef _WIN32
FdType getFd() { return toSocketHandle(*this); }
#else
FdType getFd() { return toFd(impl); }
#endif
};
public:
/** Connect to connectPort on host, start a forwarding thread.
* Listen for connection on getPort().
*/
SocketProxy(int connectPort, const std::string host="localhost")
: closed(false), joined(true),
port(listener.listen()), dropClient(), dropServer()
{
client.connect(host, boost::lexical_cast<std::string>(connectPort));
joined = false;
thread = qpid::sys::Thread(static_cast<qpid::sys::Runnable*>(this));
}
~SocketProxy() { close(); if (!joined) thread.join(); }
/** Simulate a network disconnect. */
void close() {
{
qpid::sys::Mutex::ScopedLock l(lock);
if (closed) { return; }
closed=true;
}
if (thread && thread != qpid::sys::Thread::current()) {
thread.join();
joined = true;
}
client.close();
}
/** Simulate lost packets, drop data from client */
void dropClientData(bool drop=true) { dropClient=drop; }
/** Simulate lost packets, drop data from server */
void dropServerData(bool drop=true) { dropServer=drop; }
bool isClosed() const {
qpid::sys::Mutex::ScopedLock l(lock);
return closed;
}
uint16_t getPort() const { return port; }
private:
static void throwErrno(const std::string& msg) {
throw qpid::Exception(msg+":"+qpid::sys::strError(errno));
}
static void throwIf(bool condition, const std::string& msg) {
if (condition) throw qpid::Exception(msg);
}
void run() {
std::auto_ptr<LowSocket> server;
try {
fd_set socks;
FdType maxFd = listener.getFd();
struct timeval tmo;
for (;;) {
FD_ZERO(&socks);
FD_SET(maxFd, &socks);
tmo.tv_sec = 0;
tmo.tv_usec = 500 * 1000;
if (select(maxFd+1, &socks, 0, 0, &tmo) == 0) {
qpid::sys::Mutex::ScopedLock l(lock);
throwIf(closed, "SocketProxy: Closed by close()");
continue;
}
throwIf(!FD_ISSET(maxFd, &socks), "SocketProxy: Accept failed");
break; // Accept ready... go to next step
}
server.reset(reinterpret_cast<LowSocket *>(listener.accept()));
maxFd = server->getFd();
if (client.getFd() > maxFd)
maxFd = client.getFd();
char buffer[1024];
for (;;) {
FD_ZERO(&socks);
tmo.tv_sec = 0;
tmo.tv_usec = 500 * 1000;
FD_SET(client.getFd(), &socks);
FD_SET(server->getFd(), &socks);
if (select(maxFd+1, &socks, 0, 0, &tmo) == 0) {
qpid::sys::Mutex::ScopedLock l(lock);
throwIf(closed, "SocketProxy: Closed by close()");
continue;
}
// Something is set; relay data as needed until something closes
if (FD_ISSET(server->getFd(), &socks)) {
int n = server->read(buffer, sizeof(buffer));
throwIf(n <= 0, "SocketProxy: server disconnected");
if (!dropServer) client.write(buffer, n);
}
if (FD_ISSET(client.getFd(), &socks)) {
int n = client.read(buffer, sizeof(buffer));
throwIf(n <= 0, "SocketProxy: client disconnected");
if (!dropServer) server->write(buffer, n);
}
if (!FD_ISSET(client.getFd(), &socks) &&
!FD_ISSET(server->getFd(), &socks))
throwIf(true, "SocketProxy: No handle ready");
}
}
catch (const std::exception& e) {
QPID_LOG(debug, "SocketProxy::run exception: " << e.what());
}
try {
if (server.get()) server->close();
close();
}
catch (const std::exception& e) {
QPID_LOG(debug, "SocketProxy::run exception in client/server close()" << e.what());
}
}
mutable qpid::sys::Mutex lock;
mutable bool closed;
bool joined;
LowSocket client, listener;
uint16_t port;
qpid::sys::Thread thread;
bool dropClient, dropServer;
};
}} // namespace qpid::tests
#endif
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