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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 (in->getend() - in->getptr() < (ptrdiff_t)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 (end < start + itemSize) {
- size_t n = readTLS((U8*) end, start + bufSize - end, wait);
- if (!wait && n == 0)
- return 0;
- end += n;
- }
-
- if (itemSize * nItems > (size_t)(end - ptr))
- nItems = (end - ptr) / itemSize;
-
- return nItems;
- }
-
- size_t TLSInStream::readTLS(U8* buf, size_t len, bool wait)
- {
- int n;
-
- 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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