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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2011 NoMachine (http://www.nomachine.com) */
/* Copyright (c) 2008-2017 Oleksandr Shneyder <o.shneyder@phoca-gmbh.de> */
/* Copyright (c) 2014-2022 Ulrich Sibiller <uli42@gmx.de> */
/* Copyright (c) 2014-2019 Mihai Moldovan <ionic@ionic.de> */
/* Copyright (c) 2011-2022 Mike Gabriel <mike.gabriel@das-netzwerkteam.de>*/
/* Copyright (c) 2015-2016 Qindel Group (http://www.qindel.com) */
/* */
/* NXCOMP, NX protocol compression and NX extensions to this software */
/* are copyright of the aforementioned persons and companies. */
/* */
/* Redistribution and use of the present software is allowed according */
/* to terms specified in the file LICENSE.nxcomp which comes in the */
/* source distribution. */
/* */
/* All rights reserved. */
/* */
/* NOTE: This software has received contributions from various other */
/* contributors, only the core maintainers and supporters are listed as */
/* copyright holders. Please contact us, if you feel you should be listed */
/* as copyright holder, as well. */
/* */
/**************************************************************************/
#ifndef Agent_H
#define Agent_H
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/select.h>
#include "Misc.h"
#include "Transport.h"
#include "Proxy.h"
extern Proxy *proxy;
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
class Agent
{
public:
//
// Must be created by passing the fake descriptor that
// will be used for simulating socket communication
// between the agent and the proxy. I/O will take place
// by copying data to the agent's read and write buf-
// fers.
//
Agent(int fd[2]);
~Agent();
AgentTransport *getTransport() const
{
return transport_;
}
void saveReadMask(fd_set *readSet)
{
saveRead_ = *readSet;
}
void saveWriteMask(fd_set *writeSet)
{
saveWrite_ = *writeSet;
}
void clearReadMask(fd_set *readSet)
{
FD_CLR(remoteFd_, readSet);
FD_CLR(localFd_, readSet);
}
void clearWriteMask(fd_set *writeSet)
{
FD_CLR(remoteFd_, writeSet);
FD_CLR(localFd_, writeSet);
}
void setLocalRead(fd_set *readSet, int *result)
{
(*result)++;
FD_SET(localFd_, readSet);
}
void setRemoteRead(fd_set *readSet, int *result)
{
(*result)++;
FD_SET(remoteFd_, readSet);
}
void setRemoteWrite(fd_set *writeSet, int *result)
{
(*result)++;
FD_SET(remoteFd_, writeSet);
}
fd_set *getSavedReadMask()
{
return &saveRead_;
}
fd_set *getSavedWriteMask()
{
return &saveWrite_;
}
int getRemoteFd() const
{
return remoteFd_;
}
int getLocalFd() const
{
return localFd_;
}
int getProxyFd() const
{
return proxy -> getFd();
}
int isValid() const
{
return (transport_ != NULL);
}
int localReadable()
{
return (transport_ -> readable() != 0);
}
//
// Check if we can process more data from
// the agent descriptor and cache the result
// to avoid multiple calls. This must be
// always called before querying the other
// functions.
//
void saveChannelState()
{
canRead_ = (proxy != NULL ? proxy -> canRead(localFd_) : 0);
}
int remoteCanRead(const fd_set * const readSet)
{
// OS X 10.5 requires the second argument to be non-const, so copy readSet.
// It's safe though, as FD_ISSET does not operate on it.
fd_set readWorkSet = *readSet;
#if defined(TEST) || defined(INFO)
*logofs << "Agent: remoteCanRead() is " <<
(FD_ISSET(remoteFd_, &readWorkSet) && transport_ -> dequeuable() != 0)
<< " with FD_ISSET() " << (int) FD_ISSET(remoteFd_, &readWorkSet)
<< " and dequeuable " << transport_ -> dequeuable()
<< ".\n" << logofs_flush;
#endif
return (FD_ISSET(remoteFd_, &readWorkSet) &&
transport_ -> dequeuable() != 0);
}
int remoteCanWrite(const fd_set * const writeSet)
{
// OS X 10.5 requires the second argument to be non-const, so copy writeSet.
// It's safe though, as FD_ISSET does not operate on it.
fd_set writeWorkSet = *writeSet;
#if defined(TEST) || defined(INFO)
*logofs << "Agent: remoteCanWrite() is " <<
(FD_ISSET(remoteFd_, &writeWorkSet) && transport_ ->
queuable() != 0 && canRead_ == 1) << " with FD_ISSET() "
<< (int) FD_ISSET(remoteFd_, &writeWorkSet) << " queueable "
<< transport_ -> queuable() << " channel can read "
<< canRead_ << ".\n" << logofs_flush;
#endif
return (FD_ISSET(remoteFd_, &writeWorkSet) &&
transport_ -> queuable() != 0 &&
canRead_ == 1);
}
int localCanRead()
{
#if defined(TEST) || defined(INFO)
*logofs << "Agent: localCanRead() is " <<
(transport_ -> readable() != 0 && canRead_ == 1)
<< " with readable " << transport_ -> readable()
<< " channel can read " << canRead_ << ".\n"
<< logofs_flush;
#endif
return (transport_ -> readable() != 0 &&
canRead_ == 1);
}
int proxyCanRead()
{
#if defined(TEST) || defined(INFO)
*logofs << "Agent: proxyCanRead() is " << proxy -> canRead()
<< ".\n" << logofs_flush;
#endif
return (proxy -> canRead());
}
int proxyCanRead(const fd_set * const readSet)
{
// OS X 10.5 requires the second argument to be non-const, so copy readSet.
// It's safe though, as FD_ISSET does not operate on it.
fd_set readWorkSet = *readSet;
#if defined(TEST) || defined(INFO)
*logofs << "Agent: proxyCanRead() is "
<< ((int) FD_ISSET(proxy -> getFd(), &readWorkSet))
<< ".\n" << logofs_flush;
#endif
return (FD_ISSET(proxy -> getFd(), &readWorkSet));
}
int enqueueData(const char *data, const int size) const
{
return transport_ -> enqueue(data, size);
}
int dequeueData(char *data, int size) const
{
return transport_ -> dequeue(data, size);
}
int dequeuableData() const
{
return transport_ -> dequeuable();
}
private:
int remoteFd_;
int localFd_;
fd_set saveRead_;
fd_set saveWrite_;
int canRead_;
AgentTransport *transport_;
};
#endif /* Agent_H */
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