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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/Socket.h"
#include "qpid/sys/Runnable.h"
#include "qpid/sys/Thread.h"
#include "qpid/sys/Mutex.h"
#include "qpid/client/Connection.h"
#include "qpid/log/Statement.h"
#include <algorithm>
/**
* A simple socket proxy that forwards to another socket.
* Used between client & local broker to simulate network failures.
*/
class SocketProxy : private qpid::sys::Runnable
{
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), port(listener.listen())
{
int r=::pipe(closePipe);
if (r<0) throwErrno(QPID_MSG("::pipe returned " << r));
client.connect(host, connectPort);
thread = qpid::sys::Thread(static_cast<qpid::sys::Runnable*>(this));
}
~SocketProxy() { close(); }
/** Simulate a network disconnect. */
void close() {
{
qpid::sys::Mutex::ScopedLock l(lock);
if (closed) return;
closed=true;
}
write(closePipe[1], this, 1); // Random byte to closePipe
thread.join();
client.close();
::close(closePipe[0]);
::close(closePipe[1]);
}
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::strError(errno));
}
static void throwIf(bool condition, const std::string& msg) {
if (condition) throw qpid::Exception(msg);
}
struct FdSet : fd_set {
FdSet() : maxFd(0) { clear(); }
void clear() { FD_ZERO(this); }
void set(int fd) { FD_SET(fd, this); maxFd = std::max(maxFd, fd); }
bool isSet(int fd) const { return FD_ISSET(fd, this); }
bool operator[](int fd) const { return isSet(fd); }
int maxFd;
};
enum { RD=1, WR=2, ER=4 };
struct Selector {
FdSet rd, wr, er;
void set(int fd, int sets) {
if (sets & RD) rd.set(fd);
if (sets & WR) wr.set(fd);
if (sets & ER) er.set(fd);
}
int select() {
for (;;) {
int maxFd = std::max(rd.maxFd, std::max(wr.maxFd, er.maxFd));
int r = ::select(maxFd + 1, &rd, &wr, &er, NULL);
if (r == -1 && errno == EINTR) continue;
if (r < 0) throwErrno(QPID_MSG("select returned " <<r));
return r;
}
}
};
void run() {
std::auto_ptr<qpid::sys::Socket> server;
try {
// Accept incoming connections, watch closePipe.
Selector accept;
accept.set(listener.toFd(), RD|ER);
accept.set(closePipe[0], RD|ER);
accept.select();
throwIf(accept.rd[closePipe[0]], "Closed by close()");
throwIf(!accept.rd[listener.toFd()],"Accept failed");
server.reset(listener.accept(0, 0));
// Pump data between client & server sockets, watch closePipe.
char buffer[1024];
for (;;) {
Selector select;
select.set(server->toFd(), RD|ER);
select.set(client.toFd(), RD|ER);
select.set(closePipe[0], RD|ER);
select.select();
throwIf(select.rd[closePipe[0]], "Closed by close()");
// Read even if fd is in error to throw a useful exception.
bool gotData=false;
if (select.rd[server->toFd()] || select.er[server->toFd()]) {
client.write(buffer, server->read(buffer, sizeof(buffer)));
gotData=true;
}
if (select.rd[client.toFd()] || select.er[client.toFd()]) {
server->write(buffer, client.read(buffer, sizeof(buffer)));
gotData=true;
}
throwIf(!gotData, "No data from select()");
}
}
catch (const std::exception& e) {
QPID_LOG(debug, "SocketProxy::run exiting: " << e.what());
}
if (server.get()) server->close();
close();
}
mutable qpid::sys::Mutex lock;
bool closed;
qpid::sys::Socket client, listener;
uint16_t port;
int closePipe[2];
qpid::sys::Thread thread;
};
#endif
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