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Transport.cpp
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/**************************************************************************/
/* */
/* Copyright (c) 2001, 2010 NoMachine, http://www.nomachine.com/. */
/* */
/* NXCOMP, NX protocol compression and NX extensions to this software */
/* are copyright of NoMachine. Redistribution and use of the present */
/* software is allowed according to terms specified in the file LICENSE */
/* which comes in the source distribution. */
/* */
/* Check http://www.nomachine.com/licensing.html for applicability. */
/* */
/* NX and NoMachine are trademarks of Medialogic S.p.A. */
/* */
/* All rights reserved. */
/* */
/**************************************************************************/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/socket.h>
#include "Transport.h"
#include "Statistics.h"
//
// Set the verbosity level. You also
// need to define DUMP in Misc.cpp
// if DUMP is defined here.
//
#define PANIC
#define WARNING
#undef TEST
#undef DEBUG
#undef INSPECT
#undef DUMP
//
// Used to lock and unlock the transport
// buffers before they are accessed by
// different threads.
//
#undef THREADS
//
// Define this to get logging all the
// operations performed by the parent
// thread, the one that enqueues and
// dequeues data.
//
#define PARENT
//
// Define this to know when a channel
// is created or destroyed.
//
#undef REFERENCES
//
// Reference count for allocated buffers.
//
#ifdef REFERENCES
int Transport::references_;
int ProxyTransport::references_;
int InternalTransport::references_;
#endif
//
// This is the base class providing methods for read
// and write buffering.
//
Transport::Transport(int fd) : fd_(fd)
{
#ifdef TEST
*logofs << "Transport: Going to create base transport "
<< "for FD#" << fd_ << ".\n" << logofs_flush;
#endif
type_ = transport_base;
//
// Set up the write buffer.
//
w_buffer_.length_ = 0;
w_buffer_.start_ = 0;
initialSize_ = TRANSPORT_BUFFER_DEFAULT_SIZE;
thresholdSize_ = TRANSPORT_BUFFER_DEFAULT_SIZE << 1;
maximumSize_ = TRANSPORT_BUFFER_DEFAULT_SIZE << 4;
w_buffer_.data_.resize(initialSize_);
//
// Set non-blocking IO on socket.
//
SetNonBlocking(fd_, 1);
blocked_ = 0;
finish_ = 0;
#ifdef REFERENCES
*logofs << "Transport: Created new object at "
<< this << " out of " << ++references_
<< " allocated references.\n" << logofs_flush;
#endif
}
Transport::~Transport()
{
#ifdef TEST
*logofs << "Transport: Going to destroy base class "
<< "for FD#" << fd_ << ".\n" << logofs_flush;
#endif
::close(fd_);
#ifdef REFERENCES
*logofs << "Transport: Deleted object at "
<< this << " out of " << --references_
<< " allocated references.\n" << logofs_flush;
#endif
}
//
// Read data from its file descriptor.
//
int Transport::read(unsigned char *data, unsigned int size)
{
#ifdef DEBUG
*logofs << "Transport: Going to read " << size << " bytes from "
<< "FD#" << fd_ << ".\n" << logofs_flush;
#endif
//
// Read the available data from the socket.
//
int result = ::read(fd_, data, size);
//
// Update the current timestamp as the read
// can have scheduled some other process.
//
getNewTimestamp();
if (result < 0)
{
if (EGET() == EAGAIN)
{
#ifdef TEST
*logofs << "Transport: WARNING! Read of " << size << " bytes from "
<< "FD#" << fd_ << " would block.\n" << logofs_flush;
#endif
return 0;
}
else if (EGET() == EINTR)
{
#ifdef TEST
*logofs << "Transport: Read of " << size << " bytes from "
<< "FD#" << fd_ << " was interrupted.\n"
<< logofs_flush;
#endif
return 0;
}
else
{
#ifdef TEST
*logofs << "Transport: Error reading from "
<< "FD#" << fd_ << ".\n" << logofs_flush;
#endif
finish();
return -1;
}
}
else if (result == 0)
{
#ifdef TEST
*logofs << "Transport: No data read from "
<< "FD#" << fd_ << ".\n" << logofs_flush;
#endif
finish();
return -1;
}
#ifdef TEST
*logofs << "Transport: Read " << result << " bytes out of "
<< size << " from FD#" << fd_ << ".\n" << logofs_flush;
#endif
#ifdef DUMP
*logofs << "Transport: Dumping content of read data.\n"
<< logofs_flush;
DumpData(data, result);
#endif
return result;
}
//
// Write as many bytes as possible to socket.
// Append the remaining data bytes to the end
// of the buffer and update length to reflect
// changes.
//
int Transport::write(T_write type, const unsigned char *data, const unsigned int size)
{
//
// If an immediate write was requested then
// flush the enqueued data first.
//
// Alternatively may try to write only if
// the socket is not blocked.
//
// if (w_buffer_.length_ > 0 && blocked_ == 0 &&
// type == write_immediate)
// {
// ...
// }
//
if (w_buffer_.length_ > 0 && type == write_immediate)
{
#ifdef TEST
*logofs << "Transport: Writing " << w_buffer_.length_
<< " bytes of previous data to FD#" << fd_ << ".\n"
<< logofs_flush;
#endif
int result = Transport::flush();
if (result < 0)
{
return -1;
}
}
//
// If nothing is remained, write immediately
// to the socket.
//
unsigned int written = 0;
if (w_buffer_.length_ == 0 && blocked_ == 0 &&
type == write_immediate)
{
//
// Limit the amount of data sent.
//
unsigned int toWrite = size;
#ifdef DUMP
*logofs << "Transport: Going to write " << toWrite
<< " bytes to FD#" << fd_ << " with checksum ";
DumpChecksum(data, size);
*logofs << ".\n" << logofs_flush;
#endif
T_timestamp writeTs;
int diffTs;
while (written < toWrite)
{
//
// Trace system time spent writing data.
//
writeTs = getTimestamp();
int result = ::write(fd_, data + written, toWrite - written);
diffTs = diffTimestamp(writeTs, getNewTimestamp());
statistics -> addWriteTime(diffTs);
if (result <= 0)
{
if (EGET() == EAGAIN)
{
#ifdef TEST
*logofs << "Transport: Write of " << toWrite - written
<< " bytes on FD#" << fd_ << " would block.\n"
<< logofs_flush;
#endif
blocked_ = 1;
break;
}
else if (EGET() == EINTR)
{
#ifdef TEST
*logofs << "Transport: Write of " << toWrite - written
<< " bytes on FD#" << fd_ << " was interrupted.\n"
<< logofs_flush;
#endif
continue;
}
else
{
#ifdef TEST
*logofs << "Transport: Write to " << "FD#"
<< fd_ << " failed.\n" << logofs_flush;
#endif
finish();
return -1;
}
}
else
{
#ifdef TEST
*logofs << "Transport: Immediately written " << result
<< " bytes on " << "FD#" << fd_ << ".\n"
<< logofs_flush;
#endif
written += result;
}
}
#ifdef DUMP
if (written > 0)
{
*logofs << "Transport: Dumping content of immediately written data.\n"
<< logofs_flush;
DumpData(data, written);
}
#endif
}
if (written == size)
{
//
// We will not affect the write buffer.
//
return written;
}
#ifdef DEBUG
*logofs << "Transport: Going to append " << size - written
<< " bytes to write buffer for " << "FD#" << fd_
<< ".\n" << logofs_flush;
#endif
if (resize(w_buffer_, size - written) < 0)
{
return -1;
}
memmove(w_buffer_.data_.begin() + w_buffer_.start_ + w_buffer_.length_,
data + written, size - written);
w_buffer_.length_ += size - written;
#ifdef TEST
*logofs << "Transport: Write buffer for FD#" << fd_
<< " has data for " << w_buffer_.length_ << " bytes.\n"
<< logofs_flush;
*logofs << "Transport: Start is " << w_buffer_.start_
<< " length is " << w_buffer_.length_ << " size is "
<< w_buffer_.data_.size() << " capacity is "
<< w_buffer_.data_.capacity() << ".\n"
<< logofs_flush;
#endif
//
// Note that this function always returns the whole
// size of buffer that was provided, either if not
// all the data could be actually written.
//
return size;
}
//
// Write pending data to its file descriptor.
//
int Transport::flush()
{
if (w_buffer_.length_ == 0)
{
#ifdef TEST
*logofs << "Transport: No data to flush on "
<< "FD#" << fd_ << ".\n" << logofs_flush;
#endif
#ifdef WARNING
if (blocked_ != 0)
{
*logofs << "Transport: Blocked flag is " << blocked_
<< " with no data to flush on FD#" << fd_
<< ".\n" << logofs_flush;
}
#endif
return 0;
}
//
// It's time to move data from the
// write buffer to the real link.
//
int written = 0;
int toWrite = w_buffer_.length_;
//
// We will do our best to write any available
// data to the socket, so let's say we start
// from a clean state.
//
blocked_ = 0;
#ifdef TEST
*logofs << "Transport: Going to flush " << toWrite
<< " bytes on FD#" << fd_ << ".\n"
<< logofs_flush;
#endif
T_timestamp writeTs;
int diffTs;
while (written < toWrite)
{
writeTs = getTimestamp();
int result = ::write(fd_, w_buffer_.data_.begin() + w_buffer_.start_ +
written, toWrite - written);
diffTs = diffTimestamp(writeTs, getNewTimestamp());
statistics -> addWriteTime(diffTs);
if (result <= 0)
{
if (EGET() == EAGAIN)
{
#ifdef TEST
*logofs << "Transport: Write of " << toWrite - written
<< " bytes on FD#" << fd_ << " would block.\n"
<< logofs_flush;
#endif
blocked_ = 1;
break;
}
else if (EGET() == EINTR)
{
#ifdef TEST
*logofs << "Transport: Write of " << toWrite - written
<< " bytes on FD#" << fd_ << " was interrupted.\n"
<< logofs_flush;
#endif
continue;
}
else
{
#ifdef TEST
*logofs << "Transport: Write to " << "FD#"
<< fd_ << " failed.\n" << logofs_flush;
#endif
finish();
return -1;
}
}
else
{
#ifdef TEST
*logofs << "Transport: Flushed " << result << " bytes on "
<< "FD#" << fd_ << ".\n" << logofs_flush;
#endif
written += result;
}
}
if (written > 0)
{
#ifdef DUMP
*logofs << "Transport: Dumping content of flushed data.\n"
<< logofs_flush;
DumpData(w_buffer_.data_.begin() + w_buffer_.start_, written);
#endif
//
// Update the buffer status.
//
w_buffer_.length_ -= written;
if (w_buffer_.length_ == 0)
{
w_buffer_.start_ = 0;
}
else
{
w_buffer_.start_ += written;
}
}
//
// It can be that we wrote less bytes than
// available because of the write limit.
//
if (w_buffer_.length_ > 0)
{
#ifdef TEST
*logofs << "Transport: There are still " << w_buffer_.length_
<< " bytes in write buffer for " << "FD#"
<< fd_ << ".\n" << logofs_flush;
#endif
blocked_ = 1;
}
#ifdef TEST
*logofs << "Transport: Write buffer for FD#" << fd_
<< " has data for " << w_buffer_.length_ << " bytes.\n"
<< logofs_flush;
*logofs << "Transport: Start is " << w_buffer_.start_
<< " length is " << w_buffer_.length_ << " size is "
<< w_buffer_.data_.size() << " capacity is "
<< w_buffer_.data_.capacity() << ".\n"
<< logofs_flush;
#endif
//
// No new data was produced for the link except
// any outstanding data from previous writes.
//
return 0;
}
int Transport::drain(int limit, int timeout)
{
if (w_buffer_.length_ <= limit)
{
return 1;
}
//
// Write the data accumulated in the write
// buffer until it is below the limit or
// the timeout is elapsed.
//
int toWrite = w_buffer_.length_;
int written = 0;
#ifdef TEST
*logofs << "Transport: Draining " << toWrite - limit
<< " bytes on FD#" << fd_ << " with limit set to "
<< limit << ".\n" << logofs_flush;
#endif
T_timestamp startTs = getNewTimestamp();
T_timestamp selectTs;
T_timestamp writeTs;
T_timestamp idleTs;
T_timestamp nowTs = startTs;
int diffTs;
fd_set writeSet;
fd_set readSet;
FD_ZERO(&writeSet);
FD_ZERO(&readSet);
int result;
int ready;
while (w_buffer_.length_ - written > limit)
{
nowTs = getNewTimestamp();
//
// Wait for descriptor to become
// readable or writable.
//
FD_SET(fd_, &writeSet);
FD_SET(fd_, &readSet);
setTimestamp(selectTs, timeout / 2);
idleTs = nowTs;
result = select(fd_ + 1, &readSet, &writeSet, NULL, &selectTs);
nowTs = getNewTimestamp();
diffTs = diffTimestamp(idleTs, nowTs);
statistics -> addIdleTime(diffTs);
statistics -> subReadTime(diffTs);
if (result < 0)
{
if (EGET() == EINTR)
{
#ifdef TEST
*logofs << "Transport: Select on FD#" << fd_
<< " was interrupted.\n" << logofs_flush;
#endif
continue;
}
else
{
#ifdef TEST
*logofs << "Transport: Select on FD#" << fd_
<< " failed.\n" << logofs_flush;
#endif
finish();
return -1;
}
}
else if (result > 0)
{
ready = result;
if (FD_ISSET(fd_, &writeSet))
{
writeTs = getNewTimestamp();
result = ::write(fd_, w_buffer_.data_.begin() + w_buffer_.start_ +
written, toWrite - written);
nowTs = getNewTimestamp();
diffTs = diffTimestamp(writeTs, nowTs);
statistics -> addWriteTime(diffTs);
if (result > 0)
{
#ifdef TEST
*logofs << "Transport: Forced flush of " << result
<< " bytes on " << "FD#" << fd_ << ".\n"
<< logofs_flush;
#endif
written += result;
}
else if (result < 0 && EGET() == EINTR)
{
#ifdef TEST
*logofs << "Transport: Write to FD#" << fd_
<< " was interrupted.\n" << logofs_flush;
#endif
continue;
}
else
{
#ifdef TEST
*logofs << "Transport: Write to FD#" << fd_
<< " failed.\n" << logofs_flush;
#endif
finish();
return -1;
}
ready--;
}
if (ready > 0)
{
if (FD_ISSET(fd_, &readSet))
{
#ifdef TEST
*logofs << "Transport: Not draining further "
<< "due to data readable on FD#" << fd_
<< ".\n" << logofs_flush;
#endif
break;
}
}
}
#ifdef TEST
else
{
*logofs << "Transport: Timeout encountered "
<< "waiting for FD#" << fd_ << ".\n"
<< logofs_flush;
}
#endif
nowTs = getNewTimestamp();
diffTs = diffTimestamp(startTs, nowTs);
if (diffTs >= timeout)
{
#ifdef TEST
*logofs << "Transport: Not draining further "
<< "due to the timeout on FD#" << fd_
<< ".\n" << logofs_flush;
#endif
break;
}
}
if (written > 0)
{
#ifdef DUMP
*logofs << "Transport: Dumping content of flushed data.\n"
<< logofs_flush;
DumpData(w_buffer_.data_.begin() + w_buffer_.start_, written);
#endif
//
// Update the buffer status.
//
w_buffer_.length_ -= written;
if (w_buffer_.length_ == 0)
{
w_buffer_.start_ = 0;
blocked_ = 0;
}
else
{
w_buffer_.start_ += written;
#ifdef TEST
*logofs << "Transport: There are still " << w_buffer_.length_
<< " bytes in write buffer for " << "FD#"
<< fd_ << ".\n" << logofs_flush;
#endif
blocked_ = 1;
}
}
#ifdef TEST
else
{
*logofs << "Transport: WARNING! No data written to FD#" << fd_
<< " with " << toWrite << " bytes to drain and limit "
<< "set to " << limit << ".\n" << logofs_flush;
}
#endif
#ifdef TEST
*logofs << "Transport: Write buffer for FD#" << fd_
<< " has data for " << w_buffer_.length_ << " bytes.\n"
<< logofs_flush;
*logofs << "Transport: Start is " << w_buffer_.start_
<< " length is " << w_buffer_.length_ << " size is "
<< w_buffer_.data_.size() << " capacity is "
<< w_buffer_.data_.capacity() << ".\n"
<< logofs_flush;
#endif
return (w_buffer_.length_ <= limit);
}
int Transport::wait(int timeout) const
{
T_timestamp startTs = getNewTimestamp();
T_timestamp idleTs;
T_timestamp selectTs;
T_timestamp nowTs = startTs;
long available = 0;
int result = 0;
int diffTs;
fd_set readSet;
FD_ZERO(&readSet);
FD_SET(fd_, &readSet);
for (;;)
{
available = readable();
diffTs = diffTimestamp(startTs, nowTs);
if (available != 0 || timeout == 0 ||
(diffTs + (timeout / 10)) >= timeout)
{
#ifdef TEST
*logofs << "Transport: There are " << available
<< " bytes on FD#" << fd_ << " after "
<< diffTs << " Ms.\n" << logofs_flush;
#endif
return available;
}
else if (available == 0 && result > 0)
{
#ifdef TEST
*logofs << "Transport: Read on " << "FD#"
<< fd_ << " failed.\n" << logofs_flush;
#endif
return -1;
}
//
// TODO: Should subtract the time
// already spent in select.
//
selectTs.tv_sec = 0;
selectTs.tv_usec = timeout * 1000;
idleTs = nowTs;
//
// Wait for descriptor to become readable.
//
result = select(fd_ + 1, &readSet, NULL, NULL, &selectTs);
nowTs = getNewTimestamp();
diffTs = diffTimestamp(idleTs, nowTs);
statistics -> addIdleTime(diffTs);
statistics -> subReadTime(diffTs);
if (result < 0)
{
if (EGET() == EINTR)
{
#ifdef TEST
*logofs << "Transport: Select on FD#" << fd_
<< " was interrupted.\n" << logofs_flush;
#endif
continue;
}
else
{
#ifdef TEST
*logofs << "Transport: Select on " << "FD#"
<< fd_ << " failed.\n" << logofs_flush;
#endif
return -1;
}
}
#ifdef TEST
else if (result == 0)
{
*logofs << "Transport: No data available on FD#" << fd_
<< " after " << diffTimestamp(startTs, nowTs)
<< " Ms.\n" << logofs_flush;
}
else
{
*logofs << "Transport: Data became available on FD#" << fd_
<< " after " << diffTimestamp(startTs, nowTs)
<< " Ms.\n" << logofs_flush;
}
#endif
}
}
void Transport::setSize(unsigned int initialSize, unsigned int thresholdSize,
unsigned int maximumSize)
{
initialSize_ = initialSize;
thresholdSize_ = thresholdSize;
maximumSize_ = maximumSize;
#ifdef TEST
*logofs << "Transport: Set buffer sizes for FD#" << fd_
<< " to " << initialSize_ << "/" << thresholdSize_
<< "/" << maximumSize_ << ".\n" << logofs_flush;
#endif
}
void Transport::fullReset()
{
blocked_ = 0;
finish_ = 0;
fullReset(w_buffer_);
}
int Transport::resize(T_buffer &buffer, const int &size)
{
if ((int) buffer.data_.size() >= (buffer.length_ + size) &&
(buffer.start_ + buffer.length_ + size) >
(int) buffer.data_.size())
{
if (buffer.length_ > 0)
{
//
// There is enough space in buffer but we need
// to move existing data at the beginning.
//
#ifdef TEST
*logofs << "Transport: Moving " << buffer.length_
<< " bytes of data for " << "FD#" << fd_
<< " to make room in the buffer.\n"
<< logofs_flush;
#endif
memmove(buffer.data_.begin(), buffer.data_.begin() +
buffer.start_, buffer.length_);
}
buffer.start_ = 0;
#ifdef DEBUG
*logofs << "Transport: Made room for "
<< buffer.data_.size() - buffer.start_
<< " bytes in buffer for " << "FD#"
<< fd_ << ".\n" << logofs_flush;
#endif
}
else if ((buffer.length_ + size) > (int) buffer.data_.size())
{
//
// Not enough space, so increase
// the size of the buffer.
//
if (buffer.start_ != 0 && buffer.length_ > 0)
{
#ifdef TEST