1 /******************************************************************************
2 *
3 * Program: PostgreSQL plugin for Nagios
4 * License: GPL
5 *
6 * License Information:
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * $Id$
23 *
24 *****************************************************************************/
26 #define DEFAULT_DB "template1"
27 #define DEFAULT_HOST "127.0.0.1"
29 enum {
30 DEFAULT_PORT = 5432,
31 DEFAULT_WARN = 2,
32 DEFAULT_CRIT = 8
33 };
35 #include "config.h"
36 #include "common.h"
37 #include "utils.h"
38 #include <libpq-fe.h>
40 int process_arguments (int, char **);
41 int validate_arguments (void);
42 void print_usage (void);
43 void print_help (void);
44 int is_pg_dbname (char *);
45 int is_pg_logname (char *);
47 char *pghost = NULL; /* host name of the backend server */
48 char *pgport = NULL; /* port of the backend server */
49 int default_port = DEFAULT_PORT;
50 char *pgoptions = NULL;
51 char *pgtty = NULL;
52 char dbName[NAMEDATALEN] = DEFAULT_DB;
53 char *pguser = NULL;
54 char *pgpasswd = NULL;
55 int twarn = DEFAULT_WARN;
56 int tcrit = DEFAULT_CRIT;
58 PGconn *conn;
59 /*PGresult *res;*/
61 const char *progname = "check_pgsql";
62 const char *revision = "$Revision$";
63 const char *copyright = "1999-2003";
64 const char *email = "nagiosplug-devel@lists.sourceforge.net";
65 \f
67 /******************************************************************************
69 The (psuedo?)literate programming XML is contained within \@\@\- <XML> \-\@\@
70 tags in the comments. With in the tags, the XML is assembled sequentially.
71 You can define entities in tags. You also have all the #defines available as
72 entities.
74 Please note that all tags must be lowercase to use the DocBook XML DTD.
76 @@-<article>
78 <sect1>
79 <title>Quick Reference</title>
80 <!-- The refentry forms a manpage -->
81 <refentry>
82 <refmeta>
83 <manvolnum>5<manvolnum>
84 </refmeta>
85 <refnamdiv>
86 <refname>&progname;</refname>
87 <refpurpose>&SUMMARY;</refpurpose>
88 </refnamdiv>
89 </refentry>
90 </sect1>
92 <sect1>
93 <title>FAQ</title>
94 </sect1>
96 <sect1>
97 <title>Theory, Installation, and Operation</title>
99 <sect2>
100 <title>General Description</title>
101 <para>
102 &DESCRIPTION;
103 </para>
104 </sect2>
106 <sect2>
107 <title>Future Enhancements</title>
108 <para>ToDo List</para>
109 <itemizedlist>
110 <listitem>Add option to get password from a secured file rather than the command line</listitem>
111 <listitem>Add option to specify the query to execute</listitem>
112 </itemizedlist>
113 </sect2>
116 <sect2>
117 <title>Functions</title>
118 -@@
119 ******************************************************************************/
120 \f
124 void
125 print_help (void)
126 {
127 char *myport;
129 asprintf (&myport, "%d", DEFAULT_PORT);
131 print_revision (progname, revision);
133 printf (_(COPYRIGHT), copyright, email);
135 printf (_("Test whether a PostgreSQL DBMS is accepting connections.\n\n"));
137 print_usage ();
139 printf (_(HELP_VRSN));
141 printf (_(HOST_PORT), 'P', myport);
143 printf (_(IPv46));
145 printf (S_("\
146 -d, --database=STRING\n\
147 Database to check (default: %s)\n\
148 -l, --logname = STRING\n\
149 Login name of user\n\
150 -p, --password = STRING\n\
151 Password (BIG SECURITY ISSUE)\n"), DEFAULT_DB);
153 printf (_(WARN_CRIT_TO), DEFAULT_SOCKET_TIMEOUT);
155 printf (_(VRBS));
157 printf (S_("\nAll parameters are optional.\n\
158 \n\
159 This plugin tests a PostgreSQL DBMS to determine whether it is active and\n\
160 accepting queries. In its current operation, it simply connects to the\n\
161 specified database, and then disconnects. If no database is specified, it\n\
162 connects to the template1 database, which is present in every functioning \n\
163 PostgreSQL DBMS.\n"));
164 printf (S_("\n\
165 The plugin will connect to a local postmaster if no host is specified. To\n\
166 connect to a remote host, be sure that the remote postmaster accepts TCP/IP\n\
167 connections (start the postmaster with the -i option).\n"));
168 printf (S_("\n\
169 Typically, the nagios user (unless the --logname option is used) should be\n\
170 able to connect to the database without a password. The plugin can also send\n\
171 a password, but no effort is made to obsure or encrypt the password.\n"));
173 support ();
174 }
176 void
177 print_usage (void)
178 {
179 printf (S_("\
180 Usage:\n %s [-H <host>] [-P <port>] [-c <critical time>] [-w <warning time>]\n\
181 [-t <timeout>]"), progname);
182 printf (S_("[-d <database>] [-l <logname>] [-p <password>]\n"));
183 printf (S_("\
184 %s (-h | --help) for detailed help\n\
185 %s (-V | --version) for version information\n"),
186 progname, progname);
187 }
189 int
190 main (int argc, char **argv)
191 {
192 int elapsed_time;
194 /* begin, by setting the parameters for a backend connection if the
195 * parameters are null, then the system will try to use reasonable
196 * defaults by looking up environment variables or, failing that,
197 * using hardwired constants */
199 pgoptions = NULL; /* special options to start up the backend server */
200 pgtty = NULL; /* debugging tty for the backend server */
202 if (process_arguments (argc, argv) == ERROR)
203 usage ("Could not parse arguments");
205 /* Set signal handling and alarm */
206 if (signal (SIGALRM, timeout_alarm_handler) == SIG_ERR) {
207 printf (_("Cannot catch SIGALRM"));
208 return STATE_UNKNOWN;
209 }
210 alarm (timeout_interval);
212 /* make a connection to the database */
213 time (&start_time);
214 conn =
215 PQsetdbLogin (pghost, pgport, pgoptions, pgtty, dbName, pguser, pgpasswd);
216 time (&end_time);
217 elapsed_time = (int) (end_time - start_time);
219 /* check to see that the backend connection was successfully made */
220 if (PQstatus (conn) == CONNECTION_BAD) {
221 printf (_("PGSQL: CRITICAL - no connection to '%s' (%s).\n"), dbName,
222 PQerrorMessage (conn));
223 PQfinish (conn);
224 return STATE_CRITICAL;
225 }
226 else if (elapsed_time > tcrit) {
227 PQfinish (conn);
228 printf (_("PGSQL: CRITICAL - database %s (%d sec.)\n"), dbName,
229 elapsed_time);
230 return STATE_CRITICAL;
231 }
232 else if (elapsed_time > twarn) {
233 PQfinish (conn);
234 printf (_("PGSQL: WARNING - database %s (%d sec.)\n"), dbName, elapsed_time);
235 return STATE_WARNING;
236 }
237 else {
238 PQfinish (conn);
239 printf (_("PGSQL: ok - database %s (%d sec.)\n"), dbName, elapsed_time);
240 return STATE_OK;
241 }
242 }
243 \f
246 /* process command-line arguments */
247 int
248 process_arguments (int argc, char **argv)
249 {
250 int c;
252 int option_index = 0;
253 static struct option long_options[] = {
254 {"help", no_argument, 0, 'h'},
255 {"version", no_argument, 0, 'V'},
256 {"timeout", required_argument, 0, 't'},
257 {"critical", required_argument, 0, 'c'},
258 {"warning", required_argument, 0, 'w'},
259 {"hostname", required_argument, 0, 'H'},
260 {"logname", required_argument, 0, 'l'},
261 {"password", required_argument, 0, 'p'},
262 {"authorization", required_argument, 0, 'a'},
263 {"port", required_argument, 0, 'P'},
264 {"database", required_argument, 0, 'd'},
265 {0, 0, 0, 0}
266 };
268 while (1) {
269 c = getopt_long (argc, argv, "hVt:c:w:H:P:d:l:p:a:",
270 long_options, &option_index);
272 if (c == EOF)
273 break;
275 switch (c) {
276 case '?': /* usage */
277 usage3 (_("Unknown argument"), optopt);
278 case 'h': /* help */
279 print_help ();
280 exit (STATE_OK);
281 case 'V': /* version */
282 print_revision (progname, revision);
283 exit (STATE_OK);
284 case 't': /* timeout period */
285 if (!is_integer (optarg))
286 usage2 (_("Timeout Interval must be an integer"), optarg);
287 timeout_interval = atoi (optarg);
288 break;
289 case 'c': /* critical time threshold */
290 if (!is_integer (optarg))
291 usage2 (_("Invalid critical threshold"), optarg);
292 tcrit = atoi (optarg);
293 break;
294 case 'w': /* warning time threshold */
295 if (!is_integer (optarg))
296 usage2 (_("Invalid critical threshold"), optarg);
297 twarn = atoi (optarg);
298 break;
299 case 'H': /* host */
300 if (!is_host (optarg))
301 usage2 (_("You gave an invalid host name"), optarg);
302 pghost = optarg;
303 break;
304 case 'P': /* port */
305 if (!is_integer (optarg))
306 usage2 (_("Port must be an integer"), optarg);
307 pgport = optarg;
308 break;
309 case 'd': /* database name */
310 if (!is_pg_dbname (optarg))
311 usage2 (_("Database name is not valid"), optarg);
312 strncpy (dbName, optarg, NAMEDATALEN - 1);
313 dbName[NAMEDATALEN - 1] = 0;
314 break;
315 case 'l': /* login name */
316 if (!is_pg_logname (optarg))
317 usage2 (_("user name is not valid"), optarg);
318 pguser = optarg;
319 break;
320 case 'p': /* authentication password */
321 case 'a':
322 pgpasswd = optarg;
323 break;
324 }
325 }
327 return validate_arguments ();
328 }
331 /******************************************************************************
333 @@-
334 <sect3>
335 <title>validate_arguments</title>
337 <para>&PROTO_validate_arguments;</para>
339 <para>Given a database name, this function returns TRUE if the string
340 is a valid PostgreSQL database name, and returns false if it is
341 not.</para>
343 <para>Valid PostgreSQL database names are less than &NAMEDATALEN;
344 characters long and consist of letters, numbers, and underscores. The
345 first character cannot be a number, however.</para>
347 </sect3>
348 -@@
349 ******************************************************************************/
351 int
352 validate_arguments ()
353 {
354 return OK;
355 }
356 \f
359 /******************************************************************************
361 @@-
362 <sect3>
363 <title>is_pg_dbname</title>
365 <para>&PROTO_is_pg_dbname;</para>
367 <para>Given a database name, this function returns TRUE if the string
368 is a valid PostgreSQL database name, and returns false if it is
369 not.</para>
371 <para>Valid PostgreSQL database names are less than &NAMEDATALEN;
372 characters long and consist of letters, numbers, and underscores. The
373 first character cannot be a number, however.</para>
375 </sect3>
376 -@@
377 ******************************************************************************/
379 int
380 is_pg_dbname (char *dbname)
381 {
382 char txt[NAMEDATALEN];
383 char tmp[NAMEDATALEN];
384 if (strlen (dbname) > NAMEDATALEN - 1)
385 return (FALSE);
386 strncpy (txt, dbname, NAMEDATALEN - 1);
387 txt[NAMEDATALEN - 1] = 0;
388 if (sscanf (txt, "%[_a-zA-Z]%[^_a-zA-Z0-9]", tmp, tmp) == 1)
389 return (TRUE);
390 if (sscanf (txt, "%[_a-zA-Z]%[_a-zA-Z0-9]%[^_a-zA-Z0-9]", tmp, tmp, tmp) ==
391 2) return (TRUE);
392 return (FALSE);
393 }
395 /**
397 the tango program should eventually create an entity here based on the
398 function prototype
400 @@-
401 <sect3>
402 <title>is_pg_logname</title>
404 <para>&PROTO_is_pg_logname;</para>
406 <para>Given a username, this function returns TRUE if the string is a
407 valid PostgreSQL username, and returns false if it is not. Valid PostgreSQL
408 usernames are less than &NAMEDATALEN; characters long and consist of
409 letters, numbers, dashes, and underscores, plus possibly some other
410 characters.</para>
412 <para>Currently this function only checks string length. Additional checks
413 should be added.</para>
415 </sect3>
416 -@@
417 ******************************************************************************/
419 int
420 is_pg_logname (char *username)
421 {
422 if (strlen (username) > NAMEDATALEN - 1)
423 return (FALSE);
424 return (TRUE);
425 }
427 /******************************************************************************
428 @@-
429 </sect2>
430 </sect1>
431 </article>
432 -@@
433 ******************************************************************************/