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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2005 Martin Koegler
* Copyright (C) 2010 TigerVNC Team
*
* 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 <errno.h>
#ifdef HAVE_GNUTLS
using namespace rdr;
enum { DEFAULT_BUF_SIZE = 16384 };
ssize_t TLSInStream::pull(gnutls_transport_ptr_t str, void* data, size_t size)
{
TLSInStream* self= (TLSInStream*) str;
InStream *in = self->in;
try {
if (!in->check(1, 1, false)) {
gnutls_transport_set_errno(self->session, EAGAIN);
return -1;
}
if ((size_t)(in->getend() - in->getptr()) < size)
size = in->getend() - in->getptr();
in->readBytes(data, size);
} catch (Exception& e) {
gnutls_transport_set_errno(self->session, EINVAL);
return -1;
}
return size;
}
TLSInStream::TLSInStream(InStream* _in, gnutls_session_t _session)
: session(_session), in(_in), bufSize(DEFAULT_BUF_SIZE), offset(0)
{
gnutls_transport_ptr_t recv, send;
ptr = end = start = new U8[bufSize];
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, NULL);
delete[] start;
}
size_t TLSInStream::pos()
{
return offset + ptr - start;
}
size_t TLSInStream::overrun(size_t itemSize, size_t nItems, bool wait)
{
if (itemSize > bufSize)
throw Exception("TLSInStream overrun: max itemSize exceeded");
if (end - ptr != 0)
memmove(start, ptr, end - ptr);
offset += ptr - start;
end -= ptr - start;
ptr = start;
while ((size_t)(end - start) < itemSize) {
size_t n = readTLS((U8*) end, start + bufSize - end, wait);
if (!wait && n == 0)
return 0;
end += n;
}
size_t nAvail;
nAvail = (end - ptr) / itemSize;
if (nAvail < nItems)
return nAvail;
return nItems;
}
size_t TLSInStream::readTLS(U8* buf, size_t len, bool wait)
{
int n;
if (gnutls_record_check_pending(session) == 0) {
n = in->check(1, 1, wait);
if (n == 0)
return 0;
}
n = gnutls_record_recv(session, (void *) buf, len);
if (n == GNUTLS_E_INTERRUPTED || n == GNUTLS_E_AGAIN)
return 0;
if (n < 0) throw TLSException("readTLS", n);
return n;
}
#endif
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