1 /**
2 * collectd - src/openvpn.c
3 * Copyright (C) 2008 Doug MacEachern
4 * Copyright (C) 2009 Florian octo Forster
5 * Copyright (C) 2009 Marco Chiappero
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; only version 2 of the License is applicable.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Doug MacEachern <dougm at hyperic.com>
22 * Florian octo Forster <octo at verplant.org>
23 * Marco Chiappero <marco at absence.it>
24 **/
26 #include "collectd.h"
27 #include "common.h"
28 #include "plugin.h"
30 #define V1STRING "Common Name,Real Address,Bytes Received,Bytes Sent,Connected Since\n"
31 #define V2STRING "HEADER,CLIENT_LIST,Common Name,Real Address,Virtual Address,Bytes Received,Bytes Sent,Connected Since,Connected Since (time_t)\n"
32 #define V3STRING "HEADER CLIENT_LIST Common Name Real Address Virtual Address Bytes Received Bytes Sent Connected Since Connected Since (time_t)\n"
33 #define VSSTRING "OpenVPN STATISTICS\n"
36 struct vpn_status_s
37 {
38 char *file;
39 enum
40 {
41 MULTI1 = 1, /* status-version 1 */
42 MULTI2, /* status-version 2 */
43 MULTI3, /* status-version 3 */
44 SINGLE = 10 /* currently no versions for single mode, maybe in the future */
45 } version;
46 char *name;
47 };
48 typedef struct vpn_status_s vpn_status_t;
50 static vpn_status_t **vpn_list = NULL;
51 static int vpn_num = 0;
53 static int store_compression = 1;
54 static int new_naming_schema = 0;
56 static const char *config_keys[] =
57 {
58 "StatusFile",
59 "Compression",
60 "ImprovedNamingSchema"
61 };
62 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
65 /* Helper function
66 * copy-n-pasted from common.c - changed delim to "," */
67 static int openvpn_strsplit (char *string, char **fields, size_t size)
68 {
69 size_t i;
70 char *ptr;
71 char *saveptr;
73 i = 0;
74 ptr = string;
75 saveptr = NULL;
76 while ((fields[i] = strtok_r (ptr, ",", &saveptr)) != NULL)
77 {
78 ptr = NULL;
79 i++;
81 if (i >= size)
82 break;
83 }
85 return (i);
86 } /* int openvpn_strsplit */
88 /* dispatches stats about traffic (TCP or UDP) generated by the tunnel per single endpoint */
89 static void iostats_submit (char *pinst, char *tinst, counter_t rx, counter_t tx)
90 {
91 value_t values[2];
92 value_list_t vl = VALUE_LIST_INIT;
94 values[0].counter = rx;
95 values[1].counter = tx;
97 /* NOTE ON THE NEW NAMING SCHEMA:
98 * using plugin_instance to identify each vpn config (and
99 * status) file; using type_instance to identify the endpoint
100 * host when in multimode, traffic or overhead when in single.
101 */
103 vl.values = values;
104 vl.values_len = STATIC_ARRAY_SIZE (values);
105 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
106 sstrncpy (vl.plugin, "openvpn", sizeof (vl.plugin));
107 if (pinst != NULL)
108 sstrncpy (vl.plugin_instance, pinst,
109 sizeof (vl.plugin_instance));
110 sstrncpy (vl.type, "if_octets", sizeof (vl.type));
111 if (tinst != NULL)
112 sstrncpy (vl.type_instance, tinst, sizeof (vl.type_instance));
114 plugin_dispatch_values (&vl);
115 } /* void traffic_submit */
117 /* dispatches stats about data compression shown when in single mode */
118 static void compression_submit (char *pinst, char *tinst,
119 counter_t uncompressed, counter_t compressed)
120 {
121 value_t values[2];
122 value_list_t vl = VALUE_LIST_INIT;
124 values[0].counter = uncompressed;
125 values[1].counter = compressed;
127 vl.values = values;
128 vl.values_len = STATIC_ARRAY_SIZE (values);
129 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
130 sstrncpy (vl.plugin, "openvpn", sizeof (vl.plugin));
131 if (pinst != NULL)
132 sstrncpy (vl.plugin_instance, pinst,
133 sizeof (vl.plugin_instance));
134 sstrncpy (vl.type, "compression", sizeof (vl.type));
135 if (tinst != NULL)
136 sstrncpy (vl.type_instance, tinst, sizeof (vl.type_instance));
138 plugin_dispatch_values (&vl);
139 } /* void compression_submit */
141 static int single_read (char *name, FILE *fh)
142 {
143 char buffer[1024];
144 char *fields[4];
145 const int max_fields = STATIC_ARRAY_SIZE (fields);
146 int fields_num, read = 0;
148 counter_t link_rx, link_tx;
149 counter_t tun_rx, tun_tx;
150 counter_t pre_compress, post_compress;
151 counter_t pre_decompress, post_decompress;
152 counter_t overhead_rx, overhead_tx;
154 link_rx = 0;
155 link_tx = 0;
156 tun_rx = 0;
157 tun_tx = 0;
158 pre_compress = 0;
159 post_compress = 0;
160 pre_decompress = 0;
161 post_decompress = 0;
162 overhead_rx = 0;
163 overhead_tx = 0;
165 while (fgets (buffer, sizeof (buffer), fh) != NULL)
166 {
167 fields_num = openvpn_strsplit (buffer, fields, max_fields);
169 /* status file is generated by openvpn/sig.c:print_status()
170 * http://svn.openvpn.net/projects/openvpn/trunk/openvpn/sig.c
171 *
172 * The line we're expecting has 2 fields. We ignore all lines
173 * with more or less fields.
174 */
175 if (fields_num != 2)
176 {
177 continue;
178 }
180 if (strcmp (fields[0], "TUN/TAP read bytes") == 0)
181 {
182 /* read from the system and sent over the tunnel */
183 tun_tx = atoll (fields[1]);
184 }
185 else if (strcmp (fields[0], "TUN/TAP write bytes") == 0)
186 {
187 /* read from the tunnel and written in the system */
188 tun_rx = atoll (fields[1]);
189 }
190 else if (strcmp (fields[0], "TCP/UDP read bytes") == 0)
191 {
192 link_rx = atoll (fields[1]);
193 }
194 else if (strcmp (fields[0], "TCP/UDP write bytes") == 0)
195 {
196 link_tx = atoll (fields[1]);
197 }
198 else if (strcmp (fields[0], "pre-compress bytes") == 0)
199 {
200 pre_compress = atoll (fields[1]);
201 }
202 else if (strcmp (fields[0], "post-compress bytes") == 0)
203 {
204 post_compress = atoll (fields[1]);
205 }
206 else if (strcmp (fields[0], "pre-decompress bytes") == 0)
207 {
208 pre_decompress = atoll (fields[1]);
209 }
210 else if (strcmp (fields[0], "post-decompress bytes") == 0)
211 {
212 post_decompress = atoll (fields[1]);
213 }
214 }
216 iostats_submit (name, "traffic", link_rx, link_tx);
218 /* we need to force this order to avoid negative values with these unsigned */
219 overhead_rx = (((link_rx - pre_decompress) + post_decompress) - tun_rx);
220 overhead_tx = (((link_tx - post_compress) + pre_compress) - tun_tx);
222 iostats_submit (name, "overhead", overhead_rx, overhead_tx);
224 if (store_compression)
225 {
226 compression_submit (name, "data_in", post_decompress, pre_decompress);
227 compression_submit (name, "data_out", pre_compress, post_compress);
228 }
230 read = 1;
232 return (read);
233 } /* int single_read */
235 /* for reading status version 1 */
236 static int multi1_read (char *name, FILE *fh)
237 {
238 char buffer[1024];
239 char *fields[10];
240 int fields_num, read = 0, found_header = 0;
242 /* read the file until the "ROUTING TABLE" line is found (no more info after) */
243 while (fgets (buffer, sizeof (buffer), fh) != NULL)
244 {
245 if (strcmp (buffer, "ROUTING TABLE\n") == 0)
246 break;
248 if (strcmp (buffer, V1STRING) == 0)
249 {
250 found_header = 1;
251 continue;
252 }
254 /* skip the first lines until the client list section is found */
255 if (found_header == 0)
256 /* we can't start reading data until this string is found */
257 continue;
259 fields_num = openvpn_strsplit (buffer,
260 fields, STATIC_ARRAY_SIZE (fields));
261 if (fields_num < 4)
262 continue;
264 if (new_naming_schema)
265 {
266 iostats_submit (fields[0], /* "Common Name" */
267 NULL, /* unused when in multimode */
268 atoll (fields[2]), /* "Bytes Received" */
269 atoll (fields[3])); /* "Bytes Sent" */
270 }
271 else
272 {
273 iostats_submit (name, /* vpn instance */
274 fields[0], /* "Common Name" */
275 atoll (fields[2]), /* "Bytes Received" */
276 atoll (fields[3])); /* "Bytes Sent" */
277 }
279 read = 1;
280 }
282 return (read);
283 } /* int multi1_read */
285 /* for reading status version 2 */
286 static int multi2_read (char *name, FILE *fh)
287 {
288 char buffer[1024];
289 char *fields[10];
290 const int max_fields = STATIC_ARRAY_SIZE (fields);
291 int fields_num, read = 0;
293 while (fgets (buffer, sizeof (buffer), fh) != NULL)
294 {
295 fields_num = openvpn_strsplit (buffer, fields, max_fields);
297 /* status file is generated by openvpn/multi.c:multi_print_status()
298 * http://svn.openvpn.net/projects/openvpn/trunk/openvpn/multi.c
299 *
300 * The line we're expecting has 8 fields. We ignore all lines
301 * with more or less fields.
302 */
303 if (fields_num != 8)
304 {
305 continue;
306 }
307 else
308 {
309 if (strcmp (fields[0], "CLIENT_LIST") == 0)
310 {
311 if (new_naming_schema)
312 {
313 iostats_submit (name, /* vpn instance */
314 fields[1], /* "Common Name" */
315 atoll (fields[4]), /* "Bytes Received" */
316 atoll (fields[5])); /* "Bytes Sent" */
317 }
318 else
319 {
320 iostats_submit (fields[1], /* "Common Name" */
321 NULL, /* unused when in multimode */
322 atoll (fields[4]), /* "Bytes Received" */
323 atoll (fields[5])); /* "Bytes Sent" */
324 }
326 read = 1;
327 }
328 }
329 }
331 return (read);
332 } /* int multi2_read */
334 /* for reading status version 3 */
335 static int multi3_read (char *name, FILE *fh)
336 {
337 char buffer[1024];
338 char *fields[15];
339 const int max_fields = STATIC_ARRAY_SIZE (fields);
340 int fields_num, read = 0;
342 while (fgets (buffer, sizeof (buffer), fh) != NULL)
343 {
344 fields_num = strsplit (buffer, fields, max_fields);
346 /* status file is generated by openvpn/multi.c:multi_print_status()
347 * http://svn.openvpn.net/projects/openvpn/trunk/openvpn/multi.c
348 *
349 * The line we're expecting has 12 fields. We ignore all lines
350 * with more or less fields.
351 */
352 if (fields_num != 12)
353 {
354 continue;
355 }
356 else
357 {
358 if (strcmp (fields[0], "CLIENT_LIST") == 0)
359 {
360 if (new_naming_schema)
361 {
362 iostats_submit (name, /* vpn instance */
363 fields[1], /* "Common Name" */
364 atoll (fields[4]), /* "Bytes Received" */
365 atoll (fields[5])); /* "Bytes Sent" */
366 }
367 else
368 {
369 iostats_submit (fields[1], /* "Common Name" */
370 NULL, /* unused when in multimode */
371 atoll (fields[4]), /* "Bytes Received" */
372 atoll (fields[5])); /* "Bytes Sent" */
373 }
375 read = 1;
376 }
377 }
378 }
380 return (read);
381 } /* int multi3_read */
383 /* read callback */
384 static int openvpn_read (void)
385 {
386 FILE *fh;
387 int i, read;
389 read = 0;
391 /* call the right read function for every status entry in the list */
392 for (i = 0; i < vpn_num; i++)
393 {
394 fh = fopen (vpn_list[i]->file, "r");
395 if (fh == NULL)
396 {
397 char errbuf[1024];
398 WARNING ("openvpn plugin: fopen(%s) failed: %s", vpn_list[i]->file,
399 sstrerror (errno, errbuf, sizeof (errbuf)));
401 continue;
402 }
404 switch (vpn_list[i]->version)
405 {
406 case SINGLE:
407 read = single_read(vpn_list[i]->name, fh);
408 break;
410 case MULTI1:
411 read = multi1_read(vpn_list[i]->name, fh);
412 break;
414 case MULTI2:
415 read = multi2_read(vpn_list[i]->name, fh);
416 break;
418 case MULTI3:
419 read = multi3_read(vpn_list[i]->name, fh);
420 break;
421 }
423 fclose (fh);
424 }
426 return (read ? 0 : -1);
427 } /* int openvpn_read */
429 static int version_detect (const char *filename)
430 {
431 FILE *fh;
432 char buffer[1024];
433 int version = 0;
435 /* Sanity checking. We're called from the config handling routine, so
436 * better play it save. */
437 if ((filename == NULL) || (*filename == 0))
438 return (0);
440 fh = fopen (filename, "r");
441 if (fh == NULL)
442 {
443 char errbuf[1024];
444 WARNING ("openvpn plugin: Unable to read \"%s\": %s", filename,
445 sstrerror (errno, errbuf, sizeof (errbuf)));
446 return (0);
447 }
449 /* now search for the specific multimode data format */
450 while ((fgets (buffer, sizeof (buffer), fh)) != NULL)
451 {
452 /* we look at the first line searching for SINGLE mode configuration */
453 if (strcmp (buffer, VSSTRING) == 0)
454 {
455 DEBUG ("openvpn plugin: found status file version SINGLE");
456 version = SINGLE;
457 break;
458 }
459 /* searching for multi version 1 */
460 else if (strcmp (buffer, V1STRING) == 0)
461 {
462 DEBUG ("openvpn plugin: found status file version MULTI1");
463 version = MULTI1;
464 break;
465 }
466 /* searching for multi version 2 */
467 else if (strcmp (buffer, V2STRING) == 0)
468 {
469 DEBUG ("openvpn plugin: found status file version MULTI2");
470 version = MULTI2;
471 break;
472 }
473 /* searching for multi version 3 */
474 else if (strcmp (buffer, V3STRING) == 0)
475 {
476 DEBUG ("openvpn plugin: found status file version MULTI3");
477 version = MULTI3;
478 break;
479 }
480 }
482 if (version == 0)
483 {
484 /* This is only reached during configuration, so complaining to
485 * the user is in order. */
486 NOTICE ("openvpn plugin: %s: Unknown file format, please "
487 "report this as bug. Make sure to include "
488 "your status file, so the plugin can "
489 "be adapted.", filename);
490 }
492 fclose (fh);
494 return version;
495 } /* int version_detect */
497 static int openvpn_config (const char *key, const char *value)
498 {
499 if (strcasecmp ("StatusFile", key) == 0)
500 {
501 char *status_file, *status_name, *filename;
502 int status_version, i;
503 vpn_status_t *temp;
505 /* try to detect the status file format */
506 status_version = version_detect (value);
508 if (status_version == 0)
509 {
510 WARNING ("openvpn plugin: unable to detect status version, \
511 discarding status file \"%s\".", value);
512 return (1);
513 }
515 status_file = sstrdup (value);
516 if (status_file == NULL)
517 {
518 char errbuf[1024];
519 WARNING ("openvpn plugin: sstrdup failed: %s",
520 sstrerror (errno, errbuf, sizeof (errbuf)));
521 return (1);
522 }
524 /* it determines the file name as string starting at location filename + 1 */
525 filename = strrchr (status_file, (int) '/');
526 if (filename == NULL)
527 {
528 /* status_file is already the file name only */
529 status_name = status_file;
530 }
531 else
532 {
533 /* doesn't waste memory, uses status_file starting at filename + 1 */
534 status_name = filename + 1;
535 }
537 /* scan the list looking for a clone */
538 for (i = 0; i < vpn_num; i++)
539 {
540 if (strcasecmp (vpn_list[i]->name, status_name) == 0)
541 {
542 WARNING ("openvpn plugin: status filename \"%s\" "
543 "already used, please choose a "
544 "different one.", status_name);
545 sfree (status_file);
546 return (1);
547 }
548 }
550 /* create a new vpn element since file, version and name are ok */
551 temp = (vpn_status_t *) malloc (sizeof (vpn_status_t));
552 temp->file = status_file;
553 temp->version = status_version;
554 temp->name = status_name;
556 vpn_list = (vpn_status_t **) realloc (vpn_list, (vpn_num + 1) * sizeof (vpn_status_t *));
557 if (vpn_list == NULL)
558 {
559 char errbuf[1024];
560 ERROR ("openvpn plugin: malloc failed: %s",
561 sstrerror (errno, errbuf, sizeof (errbuf)));
563 sfree (temp->file);
564 sfree (temp);
565 return (1);
566 }
568 vpn_list[vpn_num] = temp;
569 vpn_num++;
571 DEBUG ("openvpn plugin: status file \"%s\" added", temp->file);
573 }
574 else if (strcasecmp ("Compression", key) == 0)
575 {
576 if (IS_TRUE (value))
577 store_compression = 1;
578 else
579 {
580 store_compression = 0;
581 DEBUG ("openvpn plugin: no 'compression statistcs' collected");
582 }
583 }
584 else if (strcasecmp ("ImprovedNamingSchema", key) == 0)
585 {
586 if (IS_TRUE (value))
587 {
588 DEBUG ("openvpn plugin: using the new naming schema");
589 new_naming_schema = 1;
590 }
591 else
592 {
593 new_naming_schema = 0;
594 }
595 }
596 else
597 {
598 return (-1);
599 }
601 return (0);
602 } /* int openvpn_config */
604 /* shutdown callback */
605 static int openvpn_shutdown (void)
606 {
607 int i;
609 for (i = 0; i < vpn_num; i++)
610 {
611 sfree (vpn_list[i]->file);
612 sfree (vpn_list[i]);
613 }
615 sfree (vpn_list);
617 return (0);
618 } /* int openvpn_shutdown */
620 void module_register (void)
621 {
622 plugin_register_config ("openvpn", openvpn_config,
623 config_keys, config_keys_num);
624 plugin_register_read ("openvpn", openvpn_read);
625 plugin_register_shutdown ("openvpn", openvpn_shutdown);
626 } /* void module_register */