2 * collectd - src/openvpn.c
3 * Copyright (C) 2008 Doug MacEachern
4 * Copyright (C) 2009 Florian octo Forster
5 * Copyright (C) 2009 Marco Chiappero
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.
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.
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
21 * Doug MacEachern <dougm at hyperic.com>
22 * Florian octo Forster <octo at verplant.org>
23 * Marco Chiappero <marco at absence.it>
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"
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 */
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;
55 static const char *config_keys[] =
60 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
64 * copy-n-pasted from common.c - changed delim to "," */
65 static int openvpn_strsplit (char *string, char **fields, size_t size)
74 while ((fields[i] = strtok_r (ptr, ",", &saveptr)) != NULL)
84 } /* int openvpn_strsplit */
87 /* dispatches stats about traffic (TCP or UDP) generated by the tunnel per single endpoint */
88 static void iostats_submit (char *name, char *type, counter_t rx, counter_t tx)
91 value_list_t vl = VALUE_LIST_INIT;
93 values[0].counter = rx;
94 values[1].counter = tx;
96 /* NOTE: using plugin_instance to identify each vpn config (and
97 * status) file; using type_instance to identify the endpoint
98 * host when in multimode, traffic or overhead when in single.
102 vl.values_len = STATIC_ARRAY_SIZE (values);
103 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
104 sstrncpy (vl.plugin, "openvpn", sizeof (vl.plugin));
105 sstrncpy (vl.plugin_instance, name, sizeof (vl.plugin_instance));
106 sstrncpy (vl.type, "io_octets", sizeof (vl.type));
107 sstrncpy (vl.type_instance, type, sizeof (vl.type_instance));
109 plugin_dispatch_values (&vl);
110 } /* void traffic_submit */
112 /* dispatches stats about data compression shown when in single mode */
113 static void compression_submit (char *name, char *type, counter_t uncompressed, counter_t compressed)
116 value_list_t vl = VALUE_LIST_INIT;
118 values[0].counter = uncompressed;
119 values[1].counter = compressed;
122 vl.values_len = STATIC_ARRAY_SIZE (values);
123 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
124 sstrncpy (vl.plugin, "openvpn", sizeof (vl.plugin));
125 sstrncpy (vl.plugin_instance, name, sizeof (vl.plugin_instance));
126 sstrncpy (vl.type, "compression", sizeof (vl.type));
127 sstrncpy (vl.type_instance, type, sizeof (vl.type_instance));
129 plugin_dispatch_values (&vl);
130 } /* void compression_submit */
132 static int single_read (char *name, FILE *fh)
136 const int max_fields = STATIC_ARRAY_SIZE (fields);
137 int fields_num, read = 0;
139 counter_t link_rx, link_tx;
140 counter_t tun_rx, tun_tx;
141 counter_t pre_compress, post_compress;
142 counter_t pre_decompress, post_decompress;
143 counter_t overhead_rx, overhead_tx;
156 while (fgets (buffer, sizeof (buffer), fh) != NULL)
158 fields_num = openvpn_strsplit (buffer, fields, max_fields);
160 /* status file is generated by openvpn/sig.c:print_status()
161 * http://svn.openvpn.net/projects/openvpn/trunk/openvpn/sig.c
163 * The line we're expecting has 2 fields. We ignore all lines
164 * with more or less fields.
171 if (strcmp (fields[0], "TUN/TAP read bytes") == 0)
173 /* read from the system and sent over the tunnel */
174 tun_tx = atoll (fields[1]);
176 else if (strcmp (fields[0], "TUN/TAP write bytes") == 0)
178 /* read from the tunnel and written in the system */
179 tun_rx = atoll (fields[1]);
181 else if (strcmp (fields[0], "TCP/UDP read bytes") == 0)
183 link_rx = atoll (fields[1]);
185 else if (strcmp (fields[0], "TCP/UDP write bytes") == 0)
187 link_tx = atoll (fields[1]);
189 else if (strcmp (fields[0], "pre-compress bytes") == 0)
191 pre_compress = atoll (fields[1]);
193 else if (strcmp (fields[0], "post-compress bytes") == 0)
195 post_compress = atoll (fields[1]);
197 else if (strcmp (fields[0], "pre-decompress bytes") == 0)
199 pre_decompress = atoll (fields[1]);
201 else if (strcmp (fields[0], "post-decompress bytes") == 0)
203 post_decompress = atoll (fields[1]);
207 iostats_submit (name, "traffic", link_rx, link_tx);
209 /* we need to force this order to avoid negative values with these unsigned */
210 overhead_rx = (((link_rx - pre_decompress) + post_decompress) - tun_rx);
211 overhead_tx = (((link_tx - post_compress) + pre_compress) - tun_tx);
213 iostats_submit (name, "overhead", overhead_rx, overhead_tx);
215 if (store_compression)
217 compression_submit (name, "data_in", post_decompress, pre_decompress);
218 compression_submit (name, "data_out", pre_compress, post_compress);
224 } /* int single_read */
226 /* for reading status version 1 */
227 static int multi1_read (char *name, FILE *fh)
231 int fields_num, read = 0, found_header = 0;
233 /* read the file until the "ROUTING TABLE" line is found (no more info after) */
234 while (fgets (buffer, sizeof (buffer), fh) != NULL)
236 if (strcmp (buffer, "ROUTING TABLE\n") == 0)
239 if (strcmp (buffer, V1STRING) == 0)
245 /* skip the first lines until the client list section is found */
246 if (found_header == 0)
247 /* we can't start reading data until this string is found */
250 fields_num = openvpn_strsplit (buffer,
251 fields, STATIC_ARRAY_SIZE (fields));
255 iostats_submit (name, /* vpn instance */
256 fields[0], /* "Common Name" */
257 atoll (fields[2]), /* "Bytes Received" */
258 atoll (fields[3])); /* "Bytes Sent" */
263 } /* int multi1_read */
265 /* for reading status version 2 */
266 static int multi2_read (char *name, FILE *fh)
270 const int max_fields = STATIC_ARRAY_SIZE (fields);
271 int fields_num, read = 0;
273 while (fgets (buffer, sizeof (buffer), fh) != NULL)
275 fields_num = openvpn_strsplit (buffer, fields, max_fields);
277 /* status file is generated by openvpn/multi.c:multi_print_status()
278 * http://svn.openvpn.net/projects/openvpn/trunk/openvpn/multi.c
280 * The line we're expecting has 8 fields. We ignore all lines
281 * with more or less fields.
289 if (strcmp (fields[0], "CLIENT_LIST") == 0)
291 iostats_submit (name, /* vpn instance */
292 fields[1], /* "Common Name" */
293 atoll (fields[4]), /* "Bytes Received" */
294 atoll (fields[5])); /* "Bytes Sent" */
301 } /* int multi2_read */
303 /* for reading status version 3 */
304 static int multi3_read (char *name, FILE *fh)
308 const int max_fields = STATIC_ARRAY_SIZE (fields);
309 int fields_num, read = 0;
311 while (fgets (buffer, sizeof (buffer), fh) != NULL)
313 fields_num = strsplit (buffer, fields, max_fields);
315 /* status file is generated by openvpn/multi.c:multi_print_status()
316 * http://svn.openvpn.net/projects/openvpn/trunk/openvpn/multi.c
318 * The line we're expecting has 12 fields. We ignore all lines
319 * with more or less fields.
321 if (fields_num != 12)
327 if (strcmp (fields[0], "CLIENT_LIST") == 0)
329 iostats_submit (name, /* vpn instance */
330 fields[1], /* "Common Name" */
331 atoll (fields[4]), /* "Bytes Received" */
332 atoll (fields[5])); /* "Bytes Sent" */
339 } /* int multi3_read */
342 static int openvpn_read (void)
349 /* call the right read function for every status entry in the list */
350 for (i = 0; i < vpn_num; i++)
352 fh = fopen (vpn_list[i]->file, "r");
356 WARNING ("openvpn plugin: fopen(%s) failed: %s", vpn_list[i]->file,
357 sstrerror (errno, errbuf, sizeof (errbuf)));
362 switch (vpn_list[i]->version)
365 read = single_read(vpn_list[i]->name, fh);
369 read = multi1_read(vpn_list[i]->name, fh);
373 read = multi2_read(vpn_list[i]->name, fh);
377 read = multi3_read(vpn_list[i]->name, fh);
384 return (read ? 0 : -1);
385 } /* int openvpn_read */
387 static int version_detect (const char *filename)
393 /* Sanity checking. We're called from the config handling routine, so
394 * better play it save. */
395 if ((filename == NULL) || (*filename == 0))
398 fh = fopen (filename, "r");
402 WARNING ("openvpn plugin: Unable to read \"%s\": %s", filename,
403 sstrerror (errno, errbuf, sizeof (errbuf)));
407 /* now search for the specific multimode data format */
408 while ((fgets (buffer, sizeof (buffer), fh)) != NULL)
410 /* we look at the first line searching for SINGLE mode configuration */
411 if (strcmp (buffer, VSSTRING) == 0)
413 DEBUG ("openvpn plugin: found status file version SINGLE");
417 /* searching for multi version 1 */
418 else if (strcmp (buffer, V1STRING) == 0)
420 DEBUG ("openvpn plugin: found status file version MULTI1");
424 /* searching for multi version 2 */
425 else if (strcmp (buffer, V2STRING) == 0)
427 DEBUG ("openvpn plugin: found status file version MULTI2");
431 /* searching for multi version 3 */
432 else if (strcmp (buffer, V3STRING) == 0)
434 DEBUG ("openvpn plugin: found status file version MULTI3");
442 /* This is only reached during configuration, so complaining to
443 * the user is in order. */
444 NOTICE ("openvpn plugin: %s: Unknown file format, please "
445 "report this as bug. Make sure to include "
446 "your status file, so the plugin can "
447 "be adapted.", filename);
453 } /* int version_detect */
455 static int openvpn_config (const char *key, const char *value)
457 if (strcasecmp ("StatusFile", key) == 0)
459 char *status_file, *status_name, *filename;
460 int status_version, i;
463 /* try to detect the status file format */
464 status_version = version_detect (value);
466 if (status_version == 0)
468 WARNING ("openvpn plugin: unable to detect status version, \
469 discarding status file \"%s\".", value);
473 status_file = sstrdup (value);
474 if (status_file == NULL)
477 WARNING ("openvpn plugin: sstrdup failed: %s",
478 sstrerror (errno, errbuf, sizeof (errbuf)));
482 /* it determines the file name as string starting at location filename + 1 */
483 filename = strrchr (status_file, (int) '/');
484 if (filename == NULL)
486 /* status_file is already the file name only */
487 status_name = status_file;
491 /* doesn't waist memory, uses status_file starting at filename + 1 */
492 status_name = filename + 1;
495 /* scan the list looking for a clone */
496 for (i = 0; i < vpn_num; i++)
498 if (strcasecmp (vpn_list[i]->name, status_name) == 0)
500 WARNING ("openvpn plugin: status filename \"%s\" "
501 "already used, please choose a "
502 "different one.", status_name);
508 /* create a new vpn element since file, version and name are ok */
509 temp = (vpn_status_t *) malloc (sizeof (vpn_status_t));
510 temp->file = status_file;
511 temp->version = status_version;
512 temp->name = status_name;
514 vpn_list = (vpn_status_t **) realloc (vpn_list, (vpn_num + 1) * sizeof (vpn_status_t *));
515 if (vpn_list == NULL)
518 ERROR ("openvpn plugin: malloc failed: %s",
519 sstrerror (errno, errbuf, sizeof (errbuf)));
526 vpn_list[vpn_num] = temp;
529 DEBUG ("openvpn plugin: status file \"%s\" added", temp->file);
532 else if (strcasecmp ("Compression", key) == 0)
535 store_compression = 1;
538 store_compression = 0;
539 DEBUG ("openvpn plugin: no 'compression statistcs' collected");
548 } /* int openvpn_config */
550 /* shutdown callback */
551 static int openvpn_shutdown (void)
555 for (i = 0; i < vpn_num; i++)
557 sfree (vpn_list[i]->file);
564 } /* int openvpn_shutdown */
566 void module_register (void)
568 plugin_register_config ("openvpn", openvpn_config,
569 config_keys, config_keys_num);
570 plugin_register_read ("openvpn", openvpn_read);
571 plugin_register_shutdown ("openvpn", openvpn_shutdown);
572 } /* void module_register */