1 files changed, 114 insertions, 0 deletions
diff --git a/src/openvpn/memdbg.h b/src/openvpn/memdbg.h
new file mode 100644
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--- /dev/null
+++ b/src/openvpn/memdbg.h
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+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  This program 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 program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef MEMDBG_H
+#define MEMDBG_H
+
+/*
+ * Valgrind debugging support.
+ *
+ * Valgrind is a great tool for debugging memory issues,
+ * though it seems to generate a lot of warnings in OpenSSL
+ * about uninitialized data. To silence these warnings,
+ * I've put together a suppressions file
+ * in debug/valgrind-suppress.
+ *
+ * Also, grep for VALGRIND_MAKE_READABLE in the OpenVPN source.
+ * Because valgrind thinks that some of the data passed from
+ * OpenSSL back to OpenVPN is tainted due to being sourced
+ * from uninitialized data, we need to untaint it before use --
+ * otherwise we will get a lot of useless warnings.
+ *
+ *   valgrind --tool=memcheck --error-limit=no --suppressions=debug/valgrind-suppress --gen-suppressions=yes ./openvpn ...
+ */
+
+#ifdef USE_VALGRIND
+
+#include "valgrind/memcheck.h"
+
+#define VALGRIND_MAKE_READABLE(addr, len)
+
+#else
+
+#define VALGRIND_MAKE_READABLE(addr, len)
+
+#endif
+
+#ifdef DMALLOC /* see ./configure options to enable */
+
+/*
+ * See ./configure options to enable dmalloc
+ * support for memory leak checking.
+ *
+ * The dmalloc package can be downloaded from:
+ *
+ *     http://dmalloc.com/
+ *
+ * When dmalloc is installed and enabled,
+ * use this command prior to running openvpn:
+ *
+ *    dmalloc -l dlog -i 100 low -p log-unknown
+ *
+ * Also, put this in your .bashrc file:
+ *
+ *    function dmalloc { eval `command dmalloc -b $*`; }
+ *
+ * Or take a more low-level approach:
+ *
+ *    export DMALLOC_OPTIONS="debug=0x4e48503,inter=100,log=dlog"
+ *
+ *  NOTE: When building dmalloc you need to add something
+ *  like this to dmalloc's settings.h -- it will allocate a static
+ *  buffer to be used as the malloc arena:
+ *
+ *  #define INTERNAL_MEMORY_SPACE (1024 * 1024 * 50)
+ */
+
+#include "dmalloc.h"
+
+#define openvpn_dmalloc(file, line, size) dmalloc_malloc((file), (line), (size), DMALLOC_FUNC_MALLOC, 0, 0)
+
+/*
+ * This #define will put the line number of the log
+ * file position where leaked memory was allocated instead
+ * of the source code file and line number.  Make sure
+ * to increase the size of dmalloc's info tables,
+ * (MEMORY_TABLE_SIZE in settings.h)
+ * otherwise it might get overwhelmed by the large
+ * number of unique file/line combinations.
+ */
+#if 0
+#undef malloc
+#define malloc(size) openvpn_dmalloc("logfile", x_msg_line_num, (size))
+#endif
+
+#endif /* DMALLOC */
+
+/*
+ * Force buffers to be zeroed after allocation.
+ * For debugging only.
+ */
+/*#define ZERO_BUFFER_ON_ALLOC*/
+
+#endif /* MEMDBG_H */