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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2005 Martin Koegler
* Copyright (C) 2010 TigerVNC Team
* Copyright (C) 2012-2021 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <rdr/Exception.h>
#include <rdr/TLSException.h>
#include <rdr/TLSInStream.h>
#include <rfb/LogWriter.h>
#include <errno.h>
#ifdef HAVE_GNUTLS
using namespace rdr;
static rfb::LogWriter vlog("TLSInStream");
ssize_t TLSInStream::pull(gnutls_transport_ptr_t str, void* data, size_t size)
{
TLSInStream* self= (TLSInStream*) str;
InStream *in = self->in;
self->streamEmpty = false;
delete self->saved_exception;
self->saved_exception = nullptr;
try {
if (!in->hasData(1)) {
self->streamEmpty = true;
gnutls_transport_set_errno(self->session, EAGAIN);
return -1;
}
if (in->avail() < size)
size = in->avail();
in->readBytes((uint8_t*)data, size);
} catch (EndOfStream&) {
return 0;
} catch (SocketException& e) {
vlog.error("Failure reading TLS data: %s", e.str());
gnutls_transport_set_errno(self->session, e.err);
self->saved_exception = new SocketException(e);
return -1;
} catch (Exception& e) {
vlog.error("Failure reading TLS data: %s", e.str());
gnutls_transport_set_errno(self->session, EINVAL);
self->saved_exception = new Exception(e);
return -1;
}
return size;
}
TLSInStream::TLSInStream(InStream* _in, gnutls_session_t _session)
: session(_session), in(_in), saved_exception(nullptr)
{
gnutls_transport_ptr_t recv, send;
gnutls_transport_set_pull_function(session, pull);
gnutls_transport_get_ptr2(session, &recv, &send);
gnutls_transport_set_ptr2(session, this, send);
}
TLSInStream::~TLSInStream()
{
gnutls_transport_set_pull_function(session, nullptr);
delete saved_exception;
}
bool TLSInStream::fillBuffer()
{
size_t n = readTLS((uint8_t*) end, availSpace());
if (n == 0)
return false;
end += n;
return true;
}
size_t TLSInStream::readTLS(uint8_t* buf, size_t len)
{
int n;
while (true) {
streamEmpty = false;
n = gnutls_record_recv(session, (void *) buf, len);
if (n == GNUTLS_E_INTERRUPTED || n == GNUTLS_E_AGAIN) {
// GnuTLS returns GNUTLS_E_AGAIN for a bunch of other scenarios
// other than the pull function returning EAGAIN, so we have to
// double check that the underlying stream really is empty
if (!streamEmpty)
continue;
else
return 0;
}
break;
};
if (n == GNUTLS_E_PULL_ERROR)
throw *saved_exception;
if (n < 0)
throw TLSException("readTLS", n);
if (n == 0)
throw EndOfStream();
return n;
}
#endif
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