From 7be71b206433c21c8eeb758a3a8b866f877f64bd Mon Sep 17 00:00:00 2001
From: James Yonan <james@openvpn.net>
Date: Tue, 27 Oct 2015 20:09:26 -0600
Subject: [PATCH] Added Windows utility classes and methods:

Win::Service -- A Windows Service wrapper.

Win::LogFile -- a LogBase derivative that allows logging
                to a natively created and handled file.

Win::module_name() -- Get the module name as a
                      std::wstring.

Win::module_name_utf8() -- Get the module name as a UTF-8
                           string.
---
 openvpn/win/logfile.hpp | 100 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 openvpn/win/logfile.hpp

diff --git a/openvpn/win/logfile.hpp b/openvpn/win/logfile.hpp
new file mode 100644
index 00000000..9159f186
--- /dev/null
+++ b/openvpn/win/logfile.hpp
@@ -0,0 +1,100 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2015 OpenVPN Technologies, Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef OPENVPN_WIN_LOGFILE_H
+#define OPENVPN_WIN_LOGFILE_H
+
+#include <windows.h>
+
+#include <string>
+
+#include <openvpn/common/exception.hpp>
+#include <openvpn/common/wstring.hpp>
+#include <openvpn/log/logbase.hpp>
+#include <openvpn/time/timestr.hpp>
+#include <openvpn/win/winerr.hpp>
+#include <openvpn/win/secattr.hpp>
+#include <openvpn/win/scoped_handle.hpp>
+
+namespace openvpn {
+  namespace Win {
+
+    class LogFile : public LogBase
+    {
+    public:
+      typedef RCPtr<LogFile> Ptr;
+
+      LogFile(const std::string& fn,
+	      const std::string& sddl_string,
+	      bool append)
+	: log_handle(create_file(fn, sddl_string, append)),
+	  log_context(this)
+      {
+      }
+
+      virtual void log(const std::string& str) override
+      {
+	DWORD n_written;
+	const std::string line = date_time() + ' ' + str;
+	::WriteFile(log_handle(), line.c_str(), line.length(), &n_written, NULL);
+      }
+
+    private:
+      static ScopedHANDLE create_file(const std::string& fn,
+				      const std::string& sddl_string,
+				      bool append)
+      {
+	SecurityAttributes sa(sddl_string, true, "redirect_stdout_stderr");
+	const std::wstring wfn = wstring::from_utf8(fn);
+	ScopedHANDLE file(::CreateFileW(
+	    wfn.c_str(),
+	    GENERIC_WRITE,
+	    FILE_SHARE_READ,
+	    &sa.sa,
+	    append ? OPEN_ALWAYS : CREATE_ALWAYS,
+	    FILE_ATTRIBUTE_NORMAL,
+	    NULL));
+	if (!file.defined())
+	  {
+	    const Win::LastError err;
+	    OPENVPN_THROW_EXCEPTION("Win::LogFile: failed to open " << fn << " : " << err.message());
+	  }
+
+	// append to logfile?
+	if (append)
+	  {
+	    if (::SetFilePointer(file(), 0, NULL, FILE_END) == INVALID_SET_FILE_POINTER)
+	      {
+		const Win::LastError err;
+		OPENVPN_THROW_EXCEPTION("Win::LogFile: cannot append to " << fn << " : " << err.message());
+	      }
+	  }
+	return file;
+      }
+
+      ScopedHANDLE log_handle;
+      Log::Context log_context; // must be initialized last
+    };
+
+  }
+}
+
+#endif