eb1f0622989b9793acc66cde043cb43e484808b3
1 /*
2 * collectd - src/apcups.c
3 * Copyright (C) 2006-2012 Florian octo Forster
4 * Copyright (C) 2006 Anthony Gialluca <tonyabg at charter.net>
5 * Copyright (C) 2000-2004 Kern Sibbald
6 * Copyright (C) 1996-1999 Andre M. Hedrick <andre at suse.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General
10 * Public License as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public
18 * License along with this program; if not, write to the Free
19 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 * MA 02111-1307, USA.
21 *
22 * Authors:
23 * Anthony Gialluca <tonyabg at charter.net>
24 * Florian octo Forster <octo at collectd.org>
25 **/
27 #include "collectd.h"
28 #include "common.h" /* rrd_update_file */
29 #include "plugin.h" /* plugin_register, plugin_submit */
30 #include "configfile.h" /* cf_register */
32 #if HAVE_SYS_TYPES_H
33 # include <sys/types.h>
34 #endif
35 #if HAVE_SYS_SOCKET_H
36 # include <sys/socket.h>
37 #endif
38 #if HAVE_NETDB_H
39 # include <netdb.h>
40 #endif
42 #if HAVE_NETINET_IN_H
43 # include <netinet/in.h>
44 #endif
46 #define NISPORT 3551
47 #define MAXSTRING 256
48 #define MODULE_NAME "apcups"
50 #define APCUPS_DEFAULT_HOST "localhost"
52 /*
53 * Private data types
54 */
55 typedef struct
56 {
57 gauge_t linev;
58 gauge_t loadpct;
59 gauge_t bcharge;
60 gauge_t timeleft;
61 gauge_t outputv;
62 gauge_t itemp;
63 gauge_t battv;
64 gauge_t linefreq;
65 } apc_detail_t;
67 /*
68 * Private variables
69 */
70 /* Default values for contacting daemon */
71 static char *conf_host = NULL;
72 static int conf_port = NISPORT;
73 /* Defaults to false for backwards compatibility. */
74 static _Bool conf_report_seconds = 0;
76 static int global_sockfd = -1;
78 static int count_retries = 0;
79 static int count_iterations = 0;
80 static _Bool close_socket = 0;
82 static const char *config_keys[] =
83 {
84 "Host",
85 "Port",
86 "ReportSeconds"
87 };
88 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
90 static int net_shutdown (int *fd)
91 {
92 uint16_t packet_size = 0;
94 if ((fd == NULL) || (*fd < 0))
95 return (EINVAL);
97 swrite (*fd, (void *) &packet_size, sizeof (packet_size));
98 close (*fd);
99 *fd = -1;
101 return (0);
102 } /* int net_shutdown */
104 /* Close the network connection */
105 static int apcups_shutdown (void)
106 {
107 if (global_sockfd < 0)
108 return (0);
110 net_shutdown (&global_sockfd);
111 return (0);
112 } /* int apcups_shutdown */
114 /*
115 * Open a TCP connection to the UPS network server
116 * Returns -1 on error
117 * Returns socket file descriptor otherwise
118 */
119 static int net_open (char *host, int port)
120 {
121 int sd;
122 int status;
123 char port_str[8];
124 struct addrinfo ai_hints;
125 struct addrinfo *ai_return;
126 struct addrinfo *ai_list;
128 assert ((port > 0x00000000) && (port <= 0x0000FFFF));
130 /* Convert the port to a string */
131 ssnprintf (port_str, sizeof (port_str), "%i", port);
133 /* Resolve name */
134 memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
135 ai_hints.ai_family = AF_INET; /* XXX: Change this to `AF_UNSPEC' if apcupsd can handle IPv6 */
136 ai_hints.ai_socktype = SOCK_STREAM;
138 status = getaddrinfo (host, port_str, &ai_hints, &ai_return);
139 if (status != 0)
140 {
141 char errbuf[1024];
142 INFO ("apcups plugin: getaddrinfo failed: %s",
143 (status == EAI_SYSTEM)
144 ? sstrerror (errno, errbuf, sizeof (errbuf))
145 : gai_strerror (status));
146 return (-1);
147 }
149 /* Create socket */
150 sd = -1;
151 for (ai_list = ai_return; ai_list != NULL; ai_list = ai_list->ai_next)
152 {
153 sd = socket (ai_list->ai_family, ai_list->ai_socktype, ai_list->ai_protocol);
154 if (sd >= 0)
155 break;
156 }
157 /* `ai_list' still holds the current description of the socket.. */
159 if (sd < 0)
160 {
161 DEBUG ("apcups plugin: Unable to open a socket");
162 freeaddrinfo (ai_return);
163 return (-1);
164 }
166 status = connect (sd, ai_list->ai_addr, ai_list->ai_addrlen);
168 freeaddrinfo (ai_return);
170 if (status != 0) /* `connect(2)' failed */
171 {
172 char errbuf[1024];
173 INFO ("apcups plugin: connect failed: %s",
174 sstrerror (errno, errbuf, sizeof (errbuf)));
175 close (sd);
176 return (-1);
177 }
179 DEBUG ("apcups plugin: Done opening a socket %i", sd);
181 return (sd);
182 } /* int net_open (char *host, char *service, int port) */
184 /*
185 * Receive a message from the other end. Each message consists of
186 * two packets. The first is a header that contains the size
187 * of the data that follows in the second packet.
188 * Returns number of bytes read
189 * Returns 0 on end of file
190 * Returns -1 on hard end of file (i.e. network connection close)
191 * Returns -2 on error
192 */
193 static int net_recv (int *sockfd, char *buf, int buflen)
194 {
195 uint16_t packet_size;
197 /* get data size -- in short */
198 if (sread (*sockfd, (void *) &packet_size, sizeof (packet_size)) != 0)
199 {
200 close (*sockfd);
201 *sockfd = -1;
202 return (-1);
203 }
205 packet_size = ntohs (packet_size);
206 if (packet_size > buflen)
207 {
208 ERROR ("apcups plugin: Received %"PRIu16" bytes of payload "
209 "but have only %i bytes of buffer available.",
210 packet_size, buflen);
211 close (*sockfd);
212 *sockfd = -1;
213 return (-2);
214 }
216 if (packet_size == 0)
217 return (0);
219 /* now read the actual data */
220 if (sread (*sockfd, (void *) buf, packet_size) != 0)
221 {
222 close (*sockfd);
223 *sockfd = -1;
224 return (-1);
225 }
227 return ((int) packet_size);
228 } /* static int net_recv (int *sockfd, char *buf, int buflen) */
230 /*
231 * Send a message over the network. The send consists of
232 * two network packets. The first is sends a short containing
233 * the length of the data packet which follows.
234 * Returns zero on success
235 * Returns non-zero on error
236 */
237 static int net_send (int *sockfd, char *buff, int len)
238 {
239 uint16_t packet_size;
241 assert (len > 0);
242 assert (*sockfd >= 0);
244 /* send short containing size of data packet */
245 packet_size = htons ((uint16_t) len);
247 if (swrite (*sockfd, (void *) &packet_size, sizeof (packet_size)) != 0)
248 {
249 close (*sockfd);
250 *sockfd = -1;
251 return (-1);
252 }
254 /* send data packet */
255 if (swrite (*sockfd, (void *) buff, len) != 0)
256 {
257 close (*sockfd);
258 *sockfd = -1;
259 return (-2);
260 }
262 return (0);
263 }
265 /* Get and print status from apcupsd NIS server */
266 static int apc_query_server (char *host, int port,
267 apc_detail_t *apcups_detail)
268 {
269 int n;
270 char recvline[1024];
271 char *tokptr;
272 char *toksaveptr;
273 _Bool retry = 1;
274 int status;
276 #if APCMAIN
277 # define PRINT_VALUE(name, val) printf(" Found property: name = %s; value = %f;\n", name, val)
278 #else
279 # define PRINT_VALUE(name, val) /**/
280 #endif
282 while (retry)
283 {
284 if (global_sockfd < 0)
285 {
286 global_sockfd = net_open (host, port);
287 if (global_sockfd < 0)
288 {
289 ERROR ("apcups plugin: Connecting to the "
290 "apcupsd failed.");
291 return (-1);
292 }
293 }
296 status = net_send (&global_sockfd, "status", strlen ("status"));
297 if (status != 0)
298 {
299 /* net_send is closing the socket on error. */
300 assert (global_sockfd < 0);
301 if (retry)
302 {
303 retry = 0;
304 count_retries++;
305 continue;
306 }
308 ERROR ("apcups plugin: Writing to the socket failed.");
309 return (-1);
310 }
312 break;
313 } /* while (retry) */
315 /* When collectd's collection interval is larger than apcupsd's
316 * timeout, we would have to retry / re-connect each iteration. Try to
317 * detect this situation and shut down the socket gracefully in that
318 * case. Otherwise, keep the socket open to avoid overhead. */
319 count_iterations++;
320 if ((count_iterations == 10) && (count_retries > 2))
321 {
322 NOTICE ("apcups plugin: There have been %i retries in the "
323 "first %i iterations. Will close the socket "
324 "in future iterations.",
325 count_retries, count_iterations);
326 close_socket = 1;
327 }
329 while ((n = net_recv (&global_sockfd, recvline, sizeof (recvline) - 1)) > 0)
330 {
331 assert ((unsigned int)n < sizeof (recvline));
332 recvline[n] = '\0';
333 #if APCMAIN
334 printf ("net_recv = `%s';\n", recvline);
335 #endif /* if APCMAIN */
337 toksaveptr = NULL;
338 tokptr = strtok_r (recvline, " :\t", &toksaveptr);
339 while (tokptr != NULL)
340 {
341 char *key = tokptr;
342 if ((tokptr = strtok_r (NULL, " :\t", &toksaveptr)) == NULL)
343 continue;
345 gauge_t value;
346 if (strtogauge (tokptr, &value) != 0)
347 continue;
349 PRINT_VALUE (key, value);
351 if (strcmp ("LINEV", key) == 0)
352 apcups_detail->linev = value;
353 else if (strcmp ("BATTV", key) == 0)
354 apcups_detail->battv = value;
355 else if (strcmp ("ITEMP", key) == 0)
356 apcups_detail->itemp = value;
357 else if (strcmp ("LOADPCT", key) == 0)
358 apcups_detail->loadpct = value;
359 else if (strcmp ("BCHARGE", key) == 0)
360 apcups_detail->bcharge = value;
361 else if (strcmp ("OUTPUTV", key) == 0)
362 apcups_detail->outputv = value;
363 else if (strcmp ("LINEFREQ", key) == 0)
364 apcups_detail->linefreq = value;
365 else if (strcmp ("TIMELEFT", key) == 0)
366 {
367 /* Convert minutes to seconds if requested by
368 * the user. */
369 if (conf_report_seconds)
370 value *= 60.0;
371 apcups_detail->timeleft = value;
372 }
374 tokptr = strtok_r (NULL, ":", &toksaveptr);
375 } /* while (tokptr != NULL) */
376 }
377 status = errno; /* save errno, net_shutdown() may re-set it. */
379 if (close_socket)
380 net_shutdown (&global_sockfd);
382 if (n < 0)
383 {
384 char errbuf[1024];
385 ERROR ("apcups plugin: Reading from socket failed: %s",
386 sstrerror (status, errbuf, sizeof (errbuf)));
387 return (-1);
388 }
390 return (0);
391 }
393 static int apcups_config (const char *key, const char *value)
394 {
395 if (strcasecmp (key, "host") == 0)
396 {
397 if (conf_host != NULL)
398 {
399 free (conf_host);
400 conf_host = NULL;
401 }
402 if ((conf_host = strdup (value)) == NULL)
403 return (1);
404 }
405 else if (strcasecmp (key, "Port") == 0)
406 {
407 int port_tmp = atoi (value);
408 if (port_tmp < 1 || port_tmp > 65535)
409 {
410 WARNING ("apcups plugin: Invalid port: %i", port_tmp);
411 return (1);
412 }
413 conf_port = port_tmp;
414 }
415 else if (strcasecmp (key, "ReportSeconds") == 0)
416 {
417 if (IS_TRUE (value))
418 conf_report_seconds = 1;
419 else
420 conf_report_seconds = 0;
421 }
422 else
423 {
424 return (-1);
425 }
426 return (0);
427 }
429 static void apc_submit_generic (char *type, char *type_inst, gauge_t value)
430 {
431 value_t values[1];
432 value_list_t vl = VALUE_LIST_INIT;
434 if (isnan (value))
435 return;
437 values[0].gauge = value;
439 vl.values = values;
440 vl.values_len = 1;
441 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
442 sstrncpy (vl.plugin, "apcups", sizeof (vl.plugin));
443 sstrncpy (vl.plugin_instance, "", sizeof (vl.plugin_instance));
444 sstrncpy (vl.type, type, sizeof (vl.type));
445 sstrncpy (vl.type_instance, type_inst, sizeof (vl.type_instance));
447 plugin_dispatch_values (&vl);
448 }
450 static void apc_submit (apc_detail_t const *apcups_detail)
451 {
452 apc_submit_generic ("voltage", "input", apcups_detail->linev);
453 apc_submit_generic ("voltage", "output", apcups_detail->outputv);
454 apc_submit_generic ("voltage", "battery", apcups_detail->battv);
455 apc_submit_generic ("charge", "", apcups_detail->bcharge);
456 apc_submit_generic ("percent", "load", apcups_detail->loadpct);
457 apc_submit_generic ("timeleft", "", apcups_detail->timeleft);
458 apc_submit_generic ("temperature", "", apcups_detail->itemp);
459 apc_submit_generic ("frequency", "input", apcups_detail->linefreq);
460 }
462 static int apcups_read (void)
463 {
464 apc_detail_t apcups_detail = {
465 .linev = NAN,
466 .outputv = NAN,
467 .battv = NAN,
468 .loadpct = NAN,
469 .bcharge = NAN,
470 .timeleft = NAN,
471 .itemp = NAN,
472 .linefreq = NAN,
473 };
475 int status = apc_query_server (conf_host == NULL
476 ? APCUPS_DEFAULT_HOST
477 : conf_host,
478 conf_port, &apcups_detail);
479 if (status != 0)
480 {
481 DEBUG ("apcups plugin: apc_query_server (%s, %i) = %i",
482 conf_host == NULL ? APCUPS_DEFAULT_HOST : conf_host,
483 conf_port, status);
484 return (status);
485 }
487 apc_submit (&apcups_detail);
489 return (0);
490 } /* apcups_read */
492 void module_register (void)
493 {
494 plugin_register_config ("apcups", apcups_config, config_keys,
495 config_keys_num);
496 plugin_register_read ("apcups", apcups_read);
497 plugin_register_shutdown ("apcups", apcups_shutdown);
498 } /* void module_register */