summaryrefslogtreecommitdiff
path: root/bitmask_android/openvpn/src/openvpnserv/openvpnserv.c
blob: 56f5a0250f7779ed9e4130b6509cd57489080a4a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
/*
 *  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) 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
 */

/*
 * This program allows one or more OpenVPN processes to be started
 * as a service.  To build, you must get the service sample from the
 * Platform SDK and replace Simple.c with this file.
 *
 * You should also apply service.patch to
 * service.c and service.h from the Platform SDK service sample.
 *
 * This code is designed to be built with the mingw compiler.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#include <windows.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <process.h>
#include "service.h"

/* bool definitions */
#define bool int
#define true 1
#define false 0

/* These are new for 2000/XP, so they aren't in the mingw headers yet */
#ifndef BELOW_NORMAL_PRIORITY_CLASS
#define BELOW_NORMAL_PRIORITY_CLASS 0x00004000
#endif
#ifndef ABOVE_NORMAL_PRIORITY_CLASS
#define ABOVE_NORMAL_PRIORITY_CLASS 0x00008000
#endif

struct security_attributes
{
  SECURITY_ATTRIBUTES sa;
  SECURITY_DESCRIPTOR sd;
};

/*
 * This event is initially created in the non-signaled
 * state.  It will transition to the signaled state when
 * we have received a terminate signal from the Service
 * Control Manager which will cause an asynchronous call
 * of ServiceStop below.
 */
#define EXIT_EVENT_NAME PACKAGE "_exit_1"

/*
 * Which registry key in HKLM should
 * we get config info from?
 */
#define REG_KEY "SOFTWARE\\" PACKAGE_NAME

static HANDLE exit_event = NULL;

/* clear an object */
#define CLEAR(x) memset(&(x), 0, sizeof(x))

/*
 * Message handling
 */
#define M_INFO    (0)                                  /* informational */
#define M_SYSERR  (MSG_FLAGS_ERROR|MSG_FLAGS_SYS_CODE) /* error + system code */
#define M_ERR     (MSG_FLAGS_ERROR)                    /* error */

/* write error to event log */
#define MSG(flags, ...) \
        { \
           char x_msg[256]; \
           openvpn_snprintf (x_msg, sizeof(x_msg), __VA_ARGS__);      \
           AddToMessageLog ((flags), x_msg); \
        }

/* get a registry string */
#define QUERY_REG_STRING(name, data) \
  { \
    len = sizeof (data); \
    status = RegQueryValueEx(openvpn_key, name, NULL, &type, data, &len); \
    if (status != ERROR_SUCCESS || type != REG_SZ) \
      { \
        SetLastError (status); \
        MSG (M_SYSERR, error_format_str, name); \
	RegCloseKey (openvpn_key); \
	goto finish; \
      } \
  }

/* get a registry string */
#define QUERY_REG_DWORD(name, data) \
  { \
    len = sizeof (DWORD); \
    status = RegQueryValueEx(openvpn_key, name, NULL, &type, (LPBYTE)&data, &len); \
    if (status != ERROR_SUCCESS || type != REG_DWORD || len != sizeof (DWORD)) \
      { \
        SetLastError (status); \
        MSG (M_SYSERR, error_format_dword, name); \
	RegCloseKey (openvpn_key); \
	goto finish; \
      } \
  }

/*
 * This is necessary due to certain buggy implementations of snprintf,
 * that don't guarantee null termination for size > 0.
 * (copied from ../buffer.c, line 217)
 * (git: 100644 blob e2f8caab0a5b2a870092c6cd508a1a50c21c3ba3	buffer.c)
 */

int openvpn_snprintf(char *str, size_t size, const char *format, ...)
{
  va_list arglist;
  int len = -1;
  if (size > 0)
    {
      va_start (arglist, format);
      len = vsnprintf (str, size, format, arglist);
      va_end (arglist);
      str[size - 1] = 0;
    }
  return (len >= 0 && len < size);
}


bool
init_security_attributes_allow_all (struct security_attributes *obj)
{
  CLEAR (*obj);

  obj->sa.nLength = sizeof (SECURITY_ATTRIBUTES);
  obj->sa.lpSecurityDescriptor = &obj->sd;
  obj->sa.bInheritHandle = TRUE;
  if (!InitializeSecurityDescriptor (&obj->sd, SECURITY_DESCRIPTOR_REVISION))
    return false;
  if (!SetSecurityDescriptorDacl (&obj->sd, TRUE, NULL, FALSE))
    return false;
  return true;
}

HANDLE
create_event (const char *name, bool allow_all, bool initial_state, bool manual_reset)
{
  if (allow_all)
    {
      struct security_attributes sa;
      if (!init_security_attributes_allow_all (&sa))
	return NULL;
      return CreateEvent (&sa.sa, (BOOL)manual_reset, (BOOL)initial_state, name);
    }
  else
    return CreateEvent (NULL, (BOOL)manual_reset, (BOOL)initial_state, name);
}

void
close_if_open (HANDLE h)
{
  if (h != NULL)
    CloseHandle (h);
}

static bool
match (const WIN32_FIND_DATA *find, const char *ext)
{
  int i;

  if (find->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
    return false;

  if (!strlen (ext))
    return true;

  i = strlen (find->cFileName) - strlen (ext) - 1;
  if (i < 1)
    return false;

  return find->cFileName[i] == '.' && !_stricmp (find->cFileName + i + 1, ext);
}

/*
 * Modify the extension on a filename.
 */
static bool
modext (char *dest, int size, const char *src, const char *newext)
{
  int i;

  if (size > 0 && (strlen (src) + 1) <= size)
    {
      strcpy (dest, src);
      dest [size - 1] = '\0';
      i = strlen (dest);
      while (--i >= 0)
	{
	  if (dest[i] == '\\')
	    break;
	  if (dest[i] == '.')
	    {
	      dest[i] = '\0';
	      break;
	    }
	}
      if (strlen (dest) + strlen(newext) + 2 <= size)
	{
	  strcat (dest, ".");
	  strcat (dest, newext);
	  return true;
	}
      dest [0] = '\0';
    }
  return false;
}

VOID ServiceStart (DWORD dwArgc, LPTSTR *lpszArgv)
{
  char exe_path[MAX_PATH];
  char config_dir[MAX_PATH];
  char ext_string[16];
  char log_dir[MAX_PATH];
  char priority_string[64];
  char append_string[2];

  DWORD priority;
  bool append;

  ResetError ();

  if (!ReportStatusToSCMgr(SERVICE_START_PENDING, NO_ERROR, 3000))
    {
      MSG (M_ERR, "ReportStatusToSCMgr #1 failed");
      goto finish;
    }

  /*
   * Create our exit event
   */
  exit_event = create_event (EXIT_EVENT_NAME, false, false, true);
  if (!exit_event)
    {
      MSG (M_ERR, "CreateEvent failed");
      goto finish;
    }

  /*
   * If exit event is already signaled, it means we were not
   * shut down properly.
   */
  if (WaitForSingleObject (exit_event, 0) != WAIT_TIMEOUT)
    {
      MSG (M_ERR, "Exit event is already signaled -- we were not shut down properly");
      goto finish;
    }

  if (!ReportStatusToSCMgr(SERVICE_START_PENDING, NO_ERROR, 3000))
    {
      MSG (M_ERR, "ReportStatusToSCMgr #2 failed");
      goto finish;
    }

  /*
   * Read info from registry in key HKLM\SOFTWARE\OpenVPN
   */
  {
    HKEY openvpn_key;
    LONG status;
    DWORD len;
    DWORD type;

    static const char error_format_str[] =
      "Error querying registry key of type REG_SZ: HKLM\\" REG_KEY "\\%s";

    static const char error_format_dword[] =
      "Error querying registry key of type REG_DWORD: HKLM\\" REG_KEY "\\%s";

    status = RegOpenKeyEx(
			  HKEY_LOCAL_MACHINE,
			  REG_KEY,
			  0,
			  KEY_READ,
			  &openvpn_key);

    if (status != ERROR_SUCCESS)
      {
	SetLastError (status);
	MSG (M_SYSERR, "Registry key HKLM\\" REG_KEY " not found");
	goto finish;
      }

    /* get path to openvpn.exe */
    QUERY_REG_STRING ("exe_path", exe_path);

    /* get path to configuration directory */
    QUERY_REG_STRING ("config_dir", config_dir);

    /* get extension on configuration files */
    QUERY_REG_STRING ("config_ext", ext_string);

    /* get path to log directory */
    QUERY_REG_STRING ("log_dir", log_dir);

    /* get priority for spawned OpenVPN subprocesses */
    QUERY_REG_STRING ("priority", priority_string);

    /* should we truncate or append to logfile? */
    QUERY_REG_STRING ("log_append", append_string);

    RegCloseKey (openvpn_key);
  }

  /* set process priority */
  priority = NORMAL_PRIORITY_CLASS;
  if (!_stricmp (priority_string, "IDLE_PRIORITY_CLASS"))
    priority = IDLE_PRIORITY_CLASS;
  else if (!_stricmp (priority_string, "BELOW_NORMAL_PRIORITY_CLASS"))
    priority = BELOW_NORMAL_PRIORITY_CLASS;
  else if (!_stricmp (priority_string, "NORMAL_PRIORITY_CLASS"))
    priority = NORMAL_PRIORITY_CLASS;
  else if (!_stricmp (priority_string, "ABOVE_NORMAL_PRIORITY_CLASS"))
    priority = ABOVE_NORMAL_PRIORITY_CLASS;
  else if (!_stricmp (priority_string, "HIGH_PRIORITY_CLASS"))
    priority = HIGH_PRIORITY_CLASS;
  else
    {
      MSG (M_ERR, "Unknown priority name: %s", priority_string);
      goto finish;
    }

  /* set log file append/truncate flag */
  append = false;
  if (append_string[0] == '0')
    append = false;
  else if (append_string[0] == '1')
    append = true;
  else
    {
      MSG (M_ERR, "Log file append flag (given as '%s') must be '0' or '1'", append_string);
      goto finish;
    }

  /*
   * Instantiate an OpenVPN process for each configuration
   * file found.
   */
  {
    WIN32_FIND_DATA find_obj;
    HANDLE find_handle;
    BOOL more_files;
    char find_string[MAX_PATH];

    openvpn_snprintf (find_string, MAX_PATH, "%s\\*", config_dir);

    find_handle = FindFirstFile (find_string, &find_obj);
    if (find_handle == INVALID_HANDLE_VALUE)
      {
        MSG (M_ERR, "Cannot get configuration file list using: %s", find_string);
	goto finish;
      }

    /*
     * Loop over each config file
     */
    do {
      HANDLE log_handle = NULL;
      STARTUPINFO start_info;
      PROCESS_INFORMATION proc_info;
      struct security_attributes sa;
      char log_file[MAX_PATH];
      char log_path[MAX_PATH];
      char command_line[256];

      CLEAR (start_info);
      CLEAR (proc_info);
      CLEAR (sa);

      if (!ReportStatusToSCMgr(SERVICE_START_PENDING, NO_ERROR, 3000))
	{
	  MSG (M_ERR, "ReportStatusToSCMgr #3 failed");
	  FindClose (find_handle);
	  goto finish;
	}

      /* does file have the correct type and extension? */
      if (match (&find_obj, ext_string))
	{
	  /* get log file pathname */
	  if (!modext (log_file, sizeof (log_file), find_obj.cFileName, "log"))
	    {
	      MSG (M_ERR, "Cannot construct logfile name based on: %s", find_obj.cFileName);
	      FindClose (find_handle);
	      goto finish;
	    }
	  openvpn_snprintf (log_path, sizeof(log_path),
                            "%s\\%s", log_dir, log_file);

	  /* construct command line */
	  openvpn_snprintf (command_line, sizeof(command_line), PACKAGE " --service %s 1 --config \"%s\"",
		      EXIT_EVENT_NAME,
		      find_obj.cFileName);

	  /* Make security attributes struct for logfile handle so it can
	     be inherited. */
	  if (!init_security_attributes_allow_all (&sa))
	    {
	      MSG (M_SYSERR, "InitializeSecurityDescriptor start_" PACKAGE " failed");
	      goto finish;
	    }

	  /* open logfile as stdout/stderr for soon-to-be-spawned subprocess */
	  log_handle = CreateFile (log_path,
				   GENERIC_WRITE,
				   FILE_SHARE_READ,
				   &sa.sa,
				   append ? OPEN_ALWAYS : CREATE_ALWAYS,
				   FILE_ATTRIBUTE_NORMAL,
				   NULL);

	  if (log_handle == INVALID_HANDLE_VALUE)
	    {
	      MSG (M_SYSERR, "Cannot open logfile: %s", log_path);
	      FindClose (find_handle);
	      goto finish;
	    }

	  /* append to logfile? */
	  if (append)
	    {
	      if (SetFilePointer (log_handle, 0, NULL, FILE_END) == INVALID_SET_FILE_POINTER)
		{
		  MSG (M_SYSERR, "Cannot seek to end of logfile: %s", log_path);
		  FindClose (find_handle);
		  goto finish;
		}
	    }

	  /* fill in STARTUPINFO struct */
	  GetStartupInfo(&start_info);
	  start_info.cb = sizeof(start_info);
	  start_info.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
	  start_info.wShowWindow = SW_HIDE;
	  start_info.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
	  start_info.hStdOutput = start_info.hStdError = log_handle;

	  /* create an OpenVPN process for one config file */
	  if (!CreateProcess(exe_path,
			     command_line,
			     NULL,
			     NULL,
			     TRUE,
			     priority | CREATE_NEW_CONSOLE,
			     NULL,
			     config_dir,
			     &start_info,
			     &proc_info))
	    {
	      MSG (M_SYSERR, "CreateProcess failed, exe='%s' cmdline='%s' dir='%s'",
		   exe_path,
		   command_line,
		   config_dir);

	      FindClose (find_handle);
	      CloseHandle (log_handle);
	      goto finish;
	    }

	  /* close unneeded handles */
	  Sleep (1000); /* try to prevent race if we close logfile
			   handle before child process DUPs it */
	  if (!CloseHandle (proc_info.hProcess)
	      || !CloseHandle (proc_info.hThread)
	      || !CloseHandle (log_handle))
	    {
	      MSG (M_SYSERR, "CloseHandle failed");
	      goto finish;
	    }
	}

      /* more files to process? */
      more_files = FindNextFile (find_handle, &find_obj);

    } while (more_files);
    
    FindClose (find_handle);
  }

  /* we are now fully started */
  if (!ReportStatusToSCMgr(SERVICE_RUNNING, NO_ERROR, 0))
    {
      MSG (M_ERR, "ReportStatusToSCMgr SERVICE_RUNNING failed");
      goto finish;
    }

  /* wait for our shutdown signal */
  if (WaitForSingleObject (exit_event, INFINITE) != WAIT_OBJECT_0)
    {
      MSG (M_ERR, "wait for shutdown signal failed");
    }

 finish:
  ServiceStop ();
  if (exit_event)
    CloseHandle (exit_event);
}

VOID ServiceStop()
{
  if (exit_event)
    SetEvent(exit_event);
}