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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/TLSOutStream.h>
#include <rfb/LogWriter.h>
#include <errno.h>
#ifdef HAVE_GNUTLS
using namespace rdr;
static rfb::LogWriter vlog("TLSOutStream");
enum { DEFAULT_BUF_SIZE = 16384 };
ssize_t TLSOutStream::push(gnutls_transport_ptr_t str, const void* data,
size_t size)
{
TLSOutStream* self= (TLSOutStream*) str;
OutStream *out = self->out;
delete self->saved_exception;
self->saved_exception = NULL;
try {
out->writeBytes(data, size);
out->flush();
} catch (SystemException &e) {
vlog.error("Failure sending TLS data: %s", e.str());
gnutls_transport_set_errno(self->session, e.err);
self->saved_exception = new SystemException(e);
return -1;
} catch (Exception& e) {
vlog.error("Failure sending TLS data: %s", e.str());
gnutls_transport_set_errno(self->session, EINVAL);
self->saved_exception = new Exception(e);
return -1;
}
return size;
}
TLSOutStream::TLSOutStream(OutStream* _out, gnutls_session_t _session)
: session(_session), out(_out), bufSize(DEFAULT_BUF_SIZE), offset(0),
saved_exception(NULL)
{
gnutls_transport_ptr_t recv, send;
ptr = start = new U8[bufSize];
end = start + bufSize;
gnutls_transport_set_push_function(session, push);
gnutls_transport_get_ptr2(session, &recv, &send);
gnutls_transport_set_ptr2(session, recv, this);
}
TLSOutStream::~TLSOutStream()
{
#if 0
try {
// flush();
} catch (Exception&) {
}
#endif
gnutls_transport_set_push_function(session, NULL);
delete [] start;
delete saved_exception;
}
size_t TLSOutStream::length()
{
return offset + ptr - start;
}
void TLSOutStream::flush()
{
U8* sentUpTo;
// Only give GnuTLS larger chunks if corked to minimize overhead
if (corked && ((ptr - start) < 1024))
return;
sentUpTo = start;
while (sentUpTo < ptr) {
size_t n = writeTLS(sentUpTo, ptr - sentUpTo);
sentUpTo += n;
offset += n;
}
ptr = start;
out->flush();
}
void TLSOutStream::cork(bool enable)
{
OutStream::cork(enable);
out->cork(enable);
}
void TLSOutStream::overrun(size_t needed)
{
if (needed > bufSize)
throw Exception("TLSOutStream overrun: buffer size exceeded");
// A cork might prevent the flush, so disable it temporarily
corked = false;
flush();
corked = true;
}
size_t TLSOutStream::writeTLS(const U8* data, size_t length)
{
int n;
n = gnutls_record_send(session, data, length);
if (n == GNUTLS_E_INTERRUPTED || n == GNUTLS_E_AGAIN)
return 0;
if (n == GNUTLS_E_PUSH_ERROR)
throw *saved_exception;
if (n < 0)
throw TLSException("writeTLS", n);
return n;
}
#endif
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