summaryrefslogtreecommitdiffstats
path: root/plugins/check_dbi.c
blob: b52602c4a2753958fd71d8384c0f12341e532702 (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
/*****************************************************************************
* 
* Nagios check_dbi plugin
* 
* License: GPL
* Copyright (c) 2011 Nagios Plugins Development Team
* Author: Sebastian 'tokkee' Harl <sh@teamix.net>
* 
* Description:
* 
* This file contains the check_dbi plugin
* 
* Runs an arbitrary SQL command and checks the result.
* 
* 
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* 
* 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.  If not, see <http://www.gnu.org/licenses/>.
* 
* 
*****************************************************************************/

const char *progname = "check_dbi";
const char *copyright = "2011";
const char *email = "nagiosplug-devel@lists.sourceforge.net";

#include "common.h"
#include "utils.h"

#include "netutils.h"

#include <dbi/dbi.h>

#include <stdarg.h>

typedef struct {
	char *key;
	char *value;
} driver_option_t;

char *host = NULL;
int verbose = 0;

char *warning_range = NULL;
char *critical_range = NULL;
thresholds *query_thresholds = NULL;

char *np_dbi_driver = NULL;
driver_option_t *np_dbi_options = NULL;
int np_dbi_options_num = 0;
char *np_dbi_database = NULL;
char *np_dbi_query = NULL;

int process_arguments (int, char **);
int validate_arguments (void);
void print_usage (void);
void print_help (void);

void np_dbi_print_error (dbi_conn, char *, ...);

int do_query (dbi_conn, double *);

int
main (int argc, char **argv)
{
	int status = STATE_UNKNOWN;

	dbi_driver driver;
	dbi_conn conn;

	struct timeval start_timeval, end_timeval;
	double elapsed_time;

	double query_val = 0.0;

	int i;

	setlocale (LC_ALL, "");
	bindtextdomain (PACKAGE, LOCALEDIR);
	textdomain (PACKAGE);

	/* Parse extra opts if any */
	argv = np_extra_opts (&argc, argv, progname);

	if (process_arguments (argc, argv) == ERROR)
		usage4 (_("Could not parse arguments"));

	/* Set signal handling and alarm */
	if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) {
		usage4 (_("Cannot catch SIGALRM"));
	}
	alarm (timeout_interval);

	if (verbose > 2)
		printf ("Initializing DBI\n");

	if (dbi_initialize (NULL) < 0) {
		printf ("UNKNOWN - failed to initialize DBI.\n");
		return STATE_UNKNOWN;
	}

	if (verbose)
		printf ("Opening DBI driver '%s'\n", np_dbi_driver);

	driver = dbi_driver_open (np_dbi_driver);
	if (! driver) {
		printf ("UNKNOWN - failed to open DBI driver '%s'; possibly it's not installed.\n",
				np_dbi_driver);

		printf ("Known drivers:\n");
		for (driver = dbi_driver_list (NULL); driver; driver = dbi_driver_list (driver)) {
			printf (" - %s\n", dbi_driver_get_name (driver));
		}
		return STATE_UNKNOWN;
	}

	/* make a connection to the database */
	gettimeofday (&start_timeval, NULL);

	conn = dbi_conn_open (driver);
	if (! conn) {
		printf ("UNKNOWN - failed top open connection object.\n");
		dbi_conn_close (conn);
		return STATE_UNKNOWN;
	}

	for (i = 0; i < np_dbi_options_num; ++i) {
		const char *opt;

		if (verbose > 1)
			printf ("Setting DBI driver option '%s' to '%s'\n",
					np_dbi_options[i].key, np_dbi_options[i].value);

		if (! dbi_conn_set_option (conn, np_dbi_options[i].key, np_dbi_options[i].value))
			continue;
		/* else: status != 0 */

		np_dbi_print_error (conn, "UNKNOWN - failed to set option '%s' to '%s'",
				np_dbi_options[i].key, np_dbi_options[i].value);
		printf ("Known driver options:\n");

		for (opt = dbi_conn_get_option_list (conn, NULL); opt;
				opt = dbi_conn_get_option_list (conn, opt)) {
			printf (" - %s\n", opt);
		}
		dbi_conn_close (conn);
		return STATE_UNKNOWN;
	}

	if (host) {
		if (verbose > 1)
			printf ("Setting DBI driver option 'host' to '%s'\n", host);
		dbi_conn_set_option (conn, "host", host);
	}

	if (verbose) {
		const char *dbname, *host;

		dbname = dbi_conn_get_option (conn, "dbname");
		host = dbi_conn_get_option (conn, "host");

		if (! dbname)
			dbname = "<unspecified>";
		if (! host)
			host = "<unspecified>";

		printf ("Connecting to database '%s' at host '%s'\n",
				dbname, host);
	}

	if (dbi_conn_connect (conn) < 0) {
		np_dbi_print_error (conn, "UNKOWN - failed to connect to database");
		return STATE_UNKNOWN;
	}

	gettimeofday (&end_timeval, NULL);
	while (start_timeval.tv_usec > end_timeval.tv_usec) {
		--end_timeval.tv_sec;
		end_timeval.tv_usec += 1000000;
	}
	elapsed_time = (double)(end_timeval.tv_sec - start_timeval.tv_sec)
		+ (double)(end_timeval.tv_usec - start_timeval.tv_usec) / 1000000.0;

	if (verbose)
		printf("Time elapsed: %f\n", elapsed_time);

	/* select a database */
	if (np_dbi_database) {
		if (verbose > 1)
			printf ("Selecting database '%s'\n", np_dbi_database);

		if (dbi_conn_select_db (conn, np_dbi_database)) {
			np_dbi_print_error (conn, "UNKOWN - failed to select database '%s'",
					np_dbi_database);
			return STATE_UNKNOWN;
		}
	}

	/* execute query */
	status = do_query (conn, &query_val);
	if (status != STATE_OK)
		/* do_query prints an error message in this case */
		return status;

	status = get_status (query_val, query_thresholds);

	if (verbose)
		printf("Closing connection\n");
	dbi_conn_close (conn);

	printf ("%s - connection time: %fs, '%s' returned %f",
			state_text (status), elapsed_time, np_dbi_query, query_val);
	printf (" | conntime=%fs;;;0 query=%f;%s;%s;0\n", elapsed_time, query_val,
			warning_range ? warning_range : "", critical_range ? critical_range : "");
	return status;
}

/* process command-line arguments */
int
process_arguments (int argc, char **argv)
{
	int c;

	int option = 0;
	static struct option longopts[] = {
		STD_LONG_OPTS,

		{"driver", required_argument, 0, 'd'},
		{"option", required_argument, 0, 'o'},
		{"query", required_argument, 0, 'q'},
		{"database", required_argument, 0, 'D'},
		{0, 0, 0, 0}
	};

	while (1) {
		c = getopt_long (argc, argv, "Vvht:c:w:H:d:o:q:D:",
				longopts, &option);

		if (c == EOF)
			break;

		switch (c) {
		case '?':     /* usage */
			usage5 ();
		case 'h':     /* help */
			print_help ();
			exit (STATE_OK);
		case 'V':     /* version */
			print_revision (progname, NP_VERSION);
			exit (STATE_OK);

		case 'c':     /* critical range */
			critical_range = optarg;
			break;
		case 'w':     /* warning range */
			warning_range = optarg;
			break;
		case 't':     /* timeout */
			if (!is_intnonneg (optarg))
				usage2 (_("Timeout interval must be a positive integer"), optarg);
			else
				timeout_interval = atoi (optarg);

		case 'H':     /* host */
			if (!is_host (optarg))
				usage2 (_("Invalid hostname/address"), optarg);
			else
				host = optarg;
			break;
		case 'v':
			verbose++;
			break;

		case 'd':
			np_dbi_driver = optarg;
			break;
		case 'o':
			{
				driver_option_t *new;

				char *k, *v;

				k = optarg;
				v = strchr (k, (int)'=');

				if (! v)
					usage2 (_("Option must be '<key>=<value>'"), optarg);

				*v = '\0';
				++v;

				new = realloc (np_dbi_options,
						(np_dbi_options_num + 1) * sizeof (*new));
				if (! new) {
					printf ("UNKOWN - failed to reallocate memory\n");
					exit (STATE_UNKNOWN);
				}

				np_dbi_options = new;
				new = np_dbi_options + np_dbi_options_num;
				++np_dbi_options_num;

				new->key = k;
				new->value = v;
			}
			break;
		case 'q':
			np_dbi_query = optarg;
			break;
		case 'D':
			np_dbi_database = optarg;
			break;
		}
	}

	set_thresholds (&query_thresholds, warning_range, critical_range);

	return validate_arguments ();
}

int
validate_arguments ()
{
	if (! np_dbi_driver)
		usage ("Must specify a DBI driver");

	if (! np_dbi_query)
		usage ("Must specify an SQL query to execute");

	return OK;
}

void
print_help (void)
{
	print_revision (progname, NP_VERSION);

	printf (COPYRIGHT, copyright, email);

	printf (_("This program checks a query result against threshold levels"));

	printf ("\n\n");

	print_usage ();

	printf (UT_HELP_VRSN);
	printf ("\n");

	printf (" %s\n", "-d, --driver=STRING");
	printf ("    %s\n", _("DBI driver to use"));
	printf (" %s\n", "-o, --option=STRING");
	printf ("    %s\n", _("DBI driver options"));
	printf (" %s\n", "-q, --query=STRING");
	printf ("    %s\n", _("SQL query to execute"));
	printf ("\n");

	printf (UT_WARN_CRIT_RANGE);

	printf (UT_TIMEOUT, DEFAULT_SOCKET_TIMEOUT);

	printf (UT_VERBOSE);

	printf ("\n");
	printf (" %s\n", _("A DBI driver (-d option) and a query (-q option) are required."));
	printf (" %s\n", _("This plugin connects to an SQL database using libdbi and executes the"));
	printf (" %s\n", _("specified SQL query. The first column of the first row of the result"));
	printf (" %s\n", _("will be used as the check result and, if specified, compared with the"));
	printf (" %s\n", _("warning and critical ranges. The result from the query has to be numeric"));
	printf (" %s\n\n", _("(strings representing numbers are fine)."));

	printf (" %s\n", _("The number and type of required DBI driver options depends on the actual"));
	printf (" %s\n", _("driver. See its documentation at http://libdbi-drivers.sourceforge.net/"));
	printf (" %s\n", _("for details."));

	printf (UT_SUPPORT);
}

void
print_usage (void)
{
	printf ("%s\n", _("Usage:"));
	printf ("%s -d <DBI driver> [-o <DBI driver option> [...]] -q <SQL query>\n", progname);
	printf (" [-H <host>] [-c <critical value>] [-w <warning value>]\n");
}

double
get_field (dbi_conn conn, dbi_result res, unsigned short *field_type)
{
	double val = 0.0;

	if (*field_type == DBI_TYPE_INTEGER) {
		val = (double)dbi_result_get_longlong_idx (res, 1);
	}
	else if (*field_type == DBI_TYPE_DECIMAL) {
		val = dbi_result_get_double_idx (res, 1);
	}
	else if (*field_type == DBI_TYPE_STRING) {
		const char *val_str;
		char *endptr = NULL;

		val_str = dbi_result_get_string_idx (res, 1);
		if ((! val_str) || (strcmp (val_str, "ERROR") == 0)) {
			np_dbi_print_error (conn, "CRITICAL - failed to fetch string value");
			*field_type = DBI_TYPE_ERROR;
			return 0.0;
		}

		if (verbose > 2)
			printf ("Query returned string '%s'\n", val_str);

		val = strtod (val_str, &endptr);
		if (endptr == val_str) {
			printf ("CRITICAL - result value is not a numeric: %s\n", val_str);
			*field_type = DBI_TYPE_ERROR;
			return 0.0;
		}
		else if ((endptr != NULL) && (*endptr != '\0')) {
			if (verbose)
				printf ("Garbage after value: %s\n", endptr);
		}
	}
	else {
		printf ("CRITICAL - cannot parse value of type %s (%i)\n",
				(*field_type == DBI_TYPE_BINARY)
					? "BINARY"
					: (*field_type == DBI_TYPE_DATETIME)
						? "DATETIME"
						: "<unknown>",
				*field_type);
		*field_type = DBI_TYPE_ERROR;
		return 0.0;
	}
	return val;
}

int
do_query (dbi_conn conn, double *res_val)
{
	dbi_result res;

	unsigned short field_type;
	double val = 0.0;

	if (verbose)
		printf ("Executing query '%s'\n", np_dbi_query);

	res = dbi_conn_query (conn, np_dbi_query);
	if (! res) {
		np_dbi_print_error (conn, "CRITICAL - failed to execute query '%s'", np_dbi_query);
		return STATE_CRITICAL;
	}

	if (dbi_result_get_numrows (res) == DBI_ROW_ERROR) {
		np_dbi_print_error (conn, "CRITICAL - failed to fetch rows");
		return STATE_CRITICAL;
	}

	if (dbi_result_get_numrows (res) < 1) {
		printf ("WARNING - no rows returned\n");
		return STATE_WARNING;
	}

	if (dbi_result_get_numfields (res) == DBI_FIELD_ERROR) {
		np_dbi_print_error (conn, "CRITICAL - failed to fetch fields");
		return STATE_CRITICAL;
	}

	if (dbi_result_get_numfields (res) < 1) {
		printf ("WARNING - no fields returned\n");
		return STATE_WARNING;
	}

	if (dbi_result_first_row (res) != 1) {
		np_dbi_print_error (conn, "CRITICAL - failed to fetch first row");
		return STATE_CRITICAL;
	}

	field_type = dbi_result_get_field_type_idx (res, 1);
	if (field_type != DBI_TYPE_ERROR)
		val = get_field (conn, res, &field_type);

	if (field_type == DBI_TYPE_ERROR) {
		np_dbi_print_error (conn, "CRITICAL - failed to fetch data");
		return STATE_CRITICAL;
	}

	*res_val = val;

	dbi_result_free (res);
	return STATE_OK;
}

void
np_dbi_print_error (dbi_conn conn, char *fmt, ...)
{
	const char *errmsg = NULL;
	va_list ap;

	va_start (ap, fmt);

	dbi_conn_error (conn, &errmsg);
	vprintf (fmt, ap);
	printf (": %s\n", errmsg);

	va_end (ap);
}