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https://github.com/kasmtech/KasmVNC.git
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259f1055cb
Provides safety against them accidentally becoming negative because of bugs in the calculations. Also does the same to CharArray and friends as they were strongly connection to the stream objects.
124 lines
2.8 KiB
C++
124 lines
2.8 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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* Copyright (C) 2005 Martin Koegler
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* Copyright (C) 2010 TigerVNC Team
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <rdr/Exception.h>
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#include <rdr/TLSException.h>
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#include <rdr/TLSOutStream.h>
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#include <errno.h>
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#ifdef HAVE_GNUTLS
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using namespace rdr;
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enum { DEFAULT_BUF_SIZE = 16384 };
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ssize_t TLSOutStream::push(gnutls_transport_ptr_t str, const void* data,
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size_t size)
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{
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TLSOutStream* self= (TLSOutStream*) str;
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OutStream *out = self->out;
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try {
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out->writeBytes(data, size);
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out->flush();
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} catch (Exception& e) {
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gnutls_transport_set_errno(self->session, EINVAL);
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return -1;
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}
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return size;
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}
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TLSOutStream::TLSOutStream(OutStream* _out, gnutls_session_t _session)
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: session(_session), out(_out), bufSize(DEFAULT_BUF_SIZE), offset(0)
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{
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gnutls_transport_ptr_t recv, send;
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ptr = start = new U8[bufSize];
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end = start + bufSize;
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gnutls_transport_set_push_function(session, push);
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gnutls_transport_get_ptr2(session, &recv, &send);
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gnutls_transport_set_ptr2(session, recv, this);
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}
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TLSOutStream::~TLSOutStream()
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{
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#if 0
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try {
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// flush();
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} catch (Exception&) {
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}
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#endif
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gnutls_transport_set_push_function(session, NULL);
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delete [] start;
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}
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size_t TLSOutStream::length()
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{
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return offset + ptr - start;
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}
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void TLSOutStream::flush()
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{
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U8* sentUpTo = start;
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while (sentUpTo < ptr) {
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size_t n = writeTLS(sentUpTo, ptr - sentUpTo);
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sentUpTo += n;
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offset += n;
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}
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ptr = start;
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out->flush();
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}
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size_t TLSOutStream::overrun(size_t itemSize, size_t nItems)
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{
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if (itemSize > bufSize)
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throw Exception("TLSOutStream overrun: max itemSize exceeded");
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flush();
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if (itemSize * nItems > (size_t)(end - ptr))
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nItems = (end - ptr) / itemSize;
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return nItems;
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}
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size_t TLSOutStream::writeTLS(const U8* data, size_t length)
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{
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int n;
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n = gnutls_record_send(session, data, length);
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if (n == GNUTLS_E_INTERRUPTED || n == GNUTLS_E_AGAIN)
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return 0;
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if (n < 0)
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throw TLSException("writeTLS", n);
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return n;
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}
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#endif
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