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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2011 Heiko Hund <heiko.hund@sophos.com>
*
* 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
*/
#include <service.h>
#include <validate.h>
/*
* These are necessary due to certain buggy implementations of (v)snprintf,
* that don't guarantee null termination for size > 0.
*/
int
openvpn_vsntprintf (LPTSTR str, size_t size, LPCTSTR format, va_list arglist)
{
int len = -1;
if (size > 0)
{
len = _vsntprintf (str, size, format, arglist);
str[size - 1] = 0;
}
return (len >= 0 && len < size);
}
int
openvpn_sntprintf (LPTSTR str, size_t size, LPCTSTR format, ...)
{
va_list arglist;
int len = -1;
if (size > 0)
{
va_start (arglist, format);
len = openvpn_vsntprintf (str, size, format, arglist);
va_end (arglist);
}
return len;
}
#define REG_KEY TEXT("SOFTWARE\\" PACKAGE_NAME)
static DWORD
GetRegString (HKEY key, LPCTSTR value, LPTSTR data, DWORD size)
{
DWORD type;
LONG status = RegQueryValueEx (key, value, NULL, &type, (LPBYTE) data, &size);
if (status == ERROR_SUCCESS && type != REG_SZ)
status = ERROR_DATATYPE_MISMATCH;
if (status != ERROR_SUCCESS)
{
SetLastError (status);
return MsgToEventLog (M_SYSERR, TEXT("Error querying registry value: HKLM\\%s\\%s"), REG_KEY, value);
}
return ERROR_SUCCESS;
}
DWORD
GetOpenvpnSettings (settings_t *s)
{
TCHAR priority[64];
TCHAR append[2];
DWORD error;
HKEY key;
LONG status = RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_KEY, 0, KEY_READ, &key);
if (status != ERROR_SUCCESS)
{
SetLastError (status);
return MsgToEventLog (M_SYSERR, TEXT("Could not open Registry key HKLM\\%s not found"), REG_KEY);
}
error = GetRegString (key, TEXT("exe_path"), s->exe_path, sizeof (s->exe_path));
if (error != ERROR_SUCCESS)
goto out;
error = GetRegString (key, TEXT("config_dir"), s->config_dir, sizeof (s->config_dir));
if (error != ERROR_SUCCESS)
goto out;
error = GetRegString (key, TEXT("config_ext"), s->ext_string, sizeof (s->ext_string));
if (error != ERROR_SUCCESS)
goto out;
error = GetRegString (key, TEXT("log_dir"), s->log_dir, sizeof (s->log_dir));
if (error != ERROR_SUCCESS)
goto out;
error = GetRegString (key, TEXT("priority"), priority, sizeof (priority));
if (error != ERROR_SUCCESS)
goto out;
error = GetRegString (key, TEXT("log_append"), append, sizeof (append));
if (error != ERROR_SUCCESS)
goto out;
/* read if present, else use default */
error = GetRegString (key, TEXT("ovpn_admin_group"), s->ovpn_admin_group, sizeof (s->ovpn_admin_group));
if (error != ERROR_SUCCESS)
{
openvpn_sntprintf(s->ovpn_admin_group, _countof(s->ovpn_admin_group), OVPN_ADMIN_GROUP);
error = 0; /* this error is not fatal */
}
/* set process priority */
if (!_tcsicmp (priority, TEXT("IDLE_PRIORITY_CLASS")))
s->priority = IDLE_PRIORITY_CLASS;
else if (!_tcsicmp (priority, TEXT("BELOW_NORMAL_PRIORITY_CLASS")))
s->priority = BELOW_NORMAL_PRIORITY_CLASS;
else if (!_tcsicmp (priority, TEXT("NORMAL_PRIORITY_CLASS")))
s->priority = NORMAL_PRIORITY_CLASS;
else if (!_tcsicmp (priority, TEXT("ABOVE_NORMAL_PRIORITY_CLASS")))
s->priority = ABOVE_NORMAL_PRIORITY_CLASS;
else if (!_tcsicmp (priority, TEXT("HIGH_PRIORITY_CLASS")))
s->priority = HIGH_PRIORITY_CLASS;
else
{
SetLastError (ERROR_INVALID_DATA);
error = MsgToEventLog (M_SYSERR, TEXT("Unknown priority name: %s"), priority);
goto out;
}
/* set log file append/truncate flag */
if (append[0] == TEXT('0'))
s->append = FALSE;
else if (append[0] == TEXT('1'))
s->append = TRUE;
else
{
SetLastError (ERROR_INVALID_DATA);
error = MsgToEventLog (M_ERR, TEXT("Log file append flag (given as '%s') must be '0' or '1'"), append);
goto out;
}
out:
RegCloseKey (key);
return error;
}
LPCTSTR
GetLastErrorText ()
{
static TCHAR buf[256];
DWORD len;
LPTSTR tmp = NULL;
len = FormatMessage (FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ARGUMENT_ARRAY,
NULL, GetLastError(), LANG_NEUTRAL, (LPTSTR)&tmp, 0, NULL);
if (len == 0 || (long) _countof (buf) < (long) len + 14)
buf[0] = TEXT('\0');
else
{
tmp[_tcslen (tmp) - 2] = TEXT('\0'); /* remove CR/LF characters */
openvpn_sntprintf (buf, _countof (buf), TEXT("%s (0x%x)"), tmp, GetLastError());
}
if (tmp)
LocalFree (tmp);
return buf;
}
DWORD
MsgToEventLog (DWORD flags, LPCTSTR format, ...)
{
HANDLE hEventSource;
TCHAR msg[2][256];
DWORD error = 0;
LPCTSTR err_msg = TEXT("");
va_list arglist;
if (flags & MSG_FLAGS_SYS_CODE)
{
error = GetLastError ();
err_msg = GetLastErrorText ();
}
hEventSource = RegisterEventSource (NULL, APPNAME);
if (hEventSource != NULL)
{
openvpn_sntprintf (msg[0], _countof (msg[0]),
TEXT("%s%s: %s"), APPNAME,
(flags & MSG_FLAGS_ERROR) ? TEXT(" error") : TEXT(""), err_msg);
va_start (arglist, format);
openvpn_vsntprintf (msg[1], _countof (msg[1]), format, arglist);
va_end (arglist);
const TCHAR *mesg[] = { msg[0], msg[1] };
ReportEvent (hEventSource, flags & MSG_FLAGS_ERROR ?
EVENTLOG_ERROR_TYPE : EVENTLOG_INFORMATION_TYPE,
0, 0, NULL, 2, 0, mesg, NULL);
DeregisterEventSource (hEventSource);
}
return error;
}
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