1 /*
2 * collectd - src/apcups.c
3 * Copyright (C) 2006 Anthony Gialluca <tonyabg at charter.net>
4 * Copyright (C) 2000-2004 Kern Sibbald
5 * Copyright (C) 1996-99 Andre M. Hedrick <andre at suse.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of version 2 of the GNU General
9 * Public License as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but 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
17 * License along with this program; if not, write to the Free
18 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
19 * MA 02111-1307, USA.
20 *
21 * Authors:
22 * Anthony Gialluca <tonyabg at charter.net>
23 **/
25 /*
26 * FIXME: Don't know why but without this here atof() was not returning
27 * correct values for me. This is behavior that I don't understand and
28 * should be examined in closer detail.
29 */
30 #include <stdlib.h>
32 #include "collectd.h"
33 #include "common.h" /* rrd_update_file */
34 #include "plugin.h" /* plugin_register, plugin_submit */
35 #include "configfile.h" /* cf_register */
36 #include "utils_debug.h"
38 #if HAVE_SYS_TYPES_H
39 # include <sys/types.h>
40 #endif
41 #if HAVE_SYS_SOCKET_H
42 # include <sys/socket.h>
43 #endif
44 #if HAVE_NETDB_H
45 # include <netdb.h>
46 #endif
48 #if HAVE_NETINET_IN_H
49 # include <netinet/in.h>
50 #endif
52 #ifndef APCMAIN
53 # define APCMAIN 0
54 #endif
56 #define NISPORT 3551
57 #define MAXSTRING 256
58 #define MODULE_NAME "apcups"
60 #define APCUPS_DEFAULT_HOST "localhost"
62 /* Default values for contacting daemon */
63 static char *global_host = NULL;
64 static int global_port = NISPORT;
66 /*
67 * The following are only if not compiled to test the module with its own main.
68 */
69 #if !APCMAIN
70 static char *bvolt_file_template = "apcups/voltage-%s.rrd";
71 static char *bvolt_ds_def[] =
72 {
73 "DS:voltage:GAUGE:"COLLECTD_HEARTBEAT":0:U",
74 };
75 static int bvolt_ds_num = 1;
77 static char *load_file_template = "apcups/load_percent.rrd";
78 static char *load_ds_def[] =
79 {
80 "DS:percent:GAUGE:"COLLECTD_HEARTBEAT":0:110",
81 };
82 static int load_ds_num = 1;
84 static char *charge_file_template = "apcups/charge_percent.rrd";
85 static char *charge_ds_def[] =
86 {
87 "DS:percent:GAUGE:"COLLECTD_HEARTBEAT":0:110",
88 };
89 static int charge_ds_num = 1;
91 static char *time_file_template = "apcups/timeleft.rrd";
92 static char *time_ds_def[] =
93 {
94 "DS:timeleft:GAUGE:"COLLECTD_HEARTBEAT":0:100",
95 };
96 static int time_ds_num = 1;
98 static char *temp_file_template = "apcups/temperature.rrd";
99 static char *temp_ds_def[] =
100 {
101 /* -273.15 is absolute zero */
102 "DS:value:GAUGE:"COLLECTD_HEARTBEAT":-274:U",
103 };
104 static int temp_ds_num = 1;
106 static char *freq_file_template = "apcups/frequency-%s.rrd";
107 static char *freq_ds_def[] =
108 {
109 "DS:frequency:GAUGE:"COLLECTD_HEARTBEAT":0:U",
110 };
111 static int freq_ds_num = 1;
113 static char *config_keys[] =
114 {
115 "Host",
116 "Port",
117 NULL
118 };
119 static int config_keys_num = 2;
121 #endif /* if APCMAIN */
123 struct apc_detail_s
124 {
125 double linev;
126 double loadpct;
127 double bcharge;
128 double timeleft;
129 double outputv;
130 double itemp;
131 double battv;
132 double linefreq;
133 };
135 #define BIG_BUF 4096
137 /*
138 * Read nbytes from the network.
139 * It is possible that the total bytes require in several
140 * read requests
141 */
142 static int read_nbytes (int *fd, char *ptr, int nbytes)
143 {
144 int nleft;
145 int nread;
147 nleft = nbytes;
148 nread = -1;
150 assert (*fd >= 0);
152 while ((nleft > 0) && (nread != 0))
153 {
154 nread = read (*fd, ptr, nleft);
156 if ((nread < 0) && (errno == EINTR || errno == EAGAIN))
157 continue;
159 if (nread < 0)
160 {
161 *fd = -1;
162 DBG ("Reading from socket failed failed: %s; *fd = -1;", strerror (errno));
163 syslog (LOG_ERR, "apcups plugin: Reading from socket failed failed: %s", strerror (errno));
164 return (-1);
165 }
167 if (nread == 0)
168 {
169 DBG ("Received EOF. Closing socket %i.", *fd);
170 close (*fd);
171 *fd = -1;
172 return (nbytes - nleft);
173 }
175 nleft -= nread;
176 ptr += nread;
177 }
179 return (nbytes - nleft);
180 }
182 /*
183 * Write nbytes to the network.
184 * It may require several writes.
185 */
186 static int write_nbytes (int *fd, void *buf, int buflen)
187 {
188 int nleft;
189 int nwritten;
190 char *ptr;
192 assert (buflen > 0);
193 assert (*fd >= 0);
195 ptr = (char *) buf;
197 nleft = buflen;
198 while (nleft > 0)
199 {
200 nwritten = write (*fd, ptr, nleft);
202 if ((nwritten < 0) && ((errno == EAGAIN) || (errno == EINTR)))
203 continue;
205 if (nwritten < 0)
206 {
207 *fd = -1;
208 DBG ("Writing to socket failed: %s; *fd = -1;", strerror (errno));
209 syslog (LOG_ERR, "apcups plugin: Writing to socket failed: %s", strerror (errno));
210 return (-1);
211 }
213 nleft -= nwritten;
214 ptr += nwritten;
215 }
217 /* If we get here, (nleft <= 0) is true */
218 return (buflen);
219 }
221 /* Close the network connection */
222 static void net_close (int *fd)
223 {
224 short pktsiz = 0;
226 assert (*fd >= 0);
228 DBG ("Gracefully shutting down socket %i.", *fd);
230 /* send EOF sentinel */
231 write_nbytes (fd, &pktsiz, sizeof (short));
233 close (*fd);
234 *fd = -1;
235 }
237 /*
238 * Open a TCP connection to the UPS network server
239 * Returns -1 on error
240 * Returns socket file descriptor otherwise
241 */
242 static int net_open (char *host, char *service, int port)
243 {
244 int sd;
245 int status;
246 char port_str[8];
247 struct addrinfo ai_hints;
248 struct addrinfo *ai_return;
249 struct addrinfo *ai_list;
251 assert ((port > 0x00000000) && (port <= 0x0000FFFF));
253 /* Convert the port to a string */
254 snprintf (port_str, 8, "%i", port);
255 port_str[7] = '\0';
257 /* Resolve name */
258 memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
259 ai_hints.ai_family = AF_INET; /* XXX: Change this to `AF_UNSPEC' if apcupsd can handle IPv6 */
260 ai_hints.ai_socktype = SOCK_STREAM;
262 status = getaddrinfo (host, port_str, &ai_hints, &ai_return);
263 if (status != 0)
264 {
265 DBG ("getaddrinfo failed: %s", status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
266 return (-1);
267 }
269 /* Create socket */
270 sd = -1;
271 for (ai_list = ai_return; ai_list != NULL; ai_list = ai_list->ai_next)
272 {
273 sd = socket (ai_list->ai_family, ai_list->ai_socktype, ai_list->ai_protocol);
274 if (sd >= 0)
275 break;
276 }
277 /* `ai_list' still holds the current description of the socket.. */
279 if (sd < 0)
280 {
281 DBG ("Unable to open a socket");
282 freeaddrinfo (ai_return);
283 return (-1);
284 }
286 status = connect (sd, ai_list->ai_addr, ai_list->ai_addrlen);
288 freeaddrinfo (ai_return);
290 if (status != 0) /* `connect(2)' failed */
291 {
292 DBG ("connect failed: %s", strerror (errno));
293 return (-1);
294 }
296 DBG ("Done opening a socket %i", sd);
298 return (sd);
299 } /* int net_open (char *host, char *service, int port) */
301 /*
302 * Receive a message from the other end. Each message consists of
303 * two packets. The first is a header that contains the size
304 * of the data that follows in the second packet.
305 * Returns number of bytes read
306 * Returns 0 on end of file
307 * Returns -1 on hard end of file (i.e. network connection close)
308 * Returns -2 on error
309 */
310 static int net_recv (int *sockfd, char *buf, int buflen)
311 {
312 int nbytes;
313 short pktsiz;
315 /* get data size -- in short */
316 if ((nbytes = read_nbytes (sockfd, (char *) &pktsiz, sizeof (short))) <= 0)
317 return (-1);
319 if (nbytes != sizeof (short))
320 return (-2);
322 pktsiz = ntohs (pktsiz);
323 if (pktsiz > buflen)
324 {
325 DBG ("record length too large");
326 return (-2);
327 }
329 if (pktsiz == 0)
330 return (0);
332 /* now read the actual data */
333 if ((nbytes = read_nbytes (sockfd, buf, pktsiz)) <= 0)
334 return (-2);
336 if (nbytes != pktsiz)
337 return (-2);
339 return (nbytes);
340 } /* static int net_recv (int sockfd, char *buf, int buflen) */
342 /*
343 * Send a message over the network. The send consists of
344 * two network packets. The first is sends a short containing
345 * the length of the data packet which follows.
346 * Returns zero on success
347 * Returns non-zero on error
348 */
349 static int net_send (int *sockfd, char *buff, int len)
350 {
351 int rc;
352 short packet_size;
354 assert (len > 0);
355 assert (*sockfd >= 0);
357 /* send short containing size of data packet */
358 packet_size = htons ((short) len);
360 rc = write_nbytes (sockfd, &packet_size, sizeof (packet_size));
361 if (rc != sizeof (packet_size))
362 return (-1);
364 /* send data packet */
365 rc = write_nbytes (sockfd, buff, len);
366 if (rc != len)
367 return (-1);
369 return (0);
370 }
372 /* Get and print status from apcupsd NIS server */
373 static int apc_query_server (char *host, int port,
374 struct apc_detail_s *apcups_detail)
375 {
376 int n;
377 char recvline[1024];
378 char *tokptr;
379 char *key;
380 double value;
382 static int sockfd = -1;
383 static unsigned int complain = 0;
385 #if APCMAIN
386 # define PRINT_VALUE(name, val) printf(" Found property: name = %s; value = %f;\n", name, val)
387 #else
388 # define PRINT_VALUE(name, val) /**/
389 #endif
391 if (sockfd < 0)
392 {
393 if ((sockfd = net_open (host, NULL, port)) < 0)
394 {
395 /* Complain once every six hours. */
396 int complain_step = 21600 / atoi (COLLECTD_STEP);
398 if ((complain % complain_step) == 0)
399 syslog (LOG_ERR, "apcups plugin: Connecting to the apcupsd failed.");
400 complain++;
402 return (-1);
403 }
404 else if (complain > 1)
405 {
406 syslog (LOG_NOTICE, "apcups plugin: Connection re-established to the apcupsd.");
407 complain = 0;
408 }
409 }
411 if (net_send (&sockfd, "status", 6) < 0)
412 {
413 syslog (LOG_ERR, "apcups plugin: Writing to the socket failed.");
414 return (-1);
415 }
417 while ((n = net_recv (&sockfd, recvline, sizeof (recvline) - 1)) > 0)
418 {
419 assert (n < sizeof (recvline));
420 recvline[n] = '\0';
421 #if APCMAIN
422 printf ("net_recv = `%s';\n", recvline);
423 #endif /* if APCMAIN */
425 tokptr = strtok (recvline, " :\t");
426 while (tokptr != NULL)
427 {
428 key = tokptr;
429 if ((tokptr = strtok (NULL, " :\t")) == NULL)
430 continue;
431 value = atof (tokptr);
433 PRINT_VALUE (key, value);
435 if (strcmp ("LINEV", key) == 0)
436 apcups_detail->linev = value;
437 else if (strcmp ("BATTV", key) == 0)
438 apcups_detail->battv = value;
439 else if (strcmp ("ITEMP", key) == 0)
440 apcups_detail->itemp = value;
441 else if (strcmp ("LOADPCT", key) == 0)
442 apcups_detail->loadpct = value;
443 else if (strcmp ("BCHARGE", key) == 0)
444 apcups_detail->bcharge = value;
445 else if (strcmp ("OUTPUTV", key) == 0)
446 apcups_detail->outputv = value;
447 else if (strcmp ("LINEFREQ", key) == 0)
448 apcups_detail->linefreq = value;
449 else if (strcmp ("TIMELEFT", key) == 0)
450 apcups_detail->timeleft = value;
452 tokptr = strtok (NULL, ":");
453 } /* while (tokptr != NULL) */
454 }
456 if (n < 0)
457 {
458 syslog (LOG_WARNING, "apcups plugin: Error reading from socket");
459 return (-1);
460 }
461 else
462 {
463 /* close the opened socket */
464 net_close (&sockfd);
465 }
467 return (0);
468 }
470 #if APCMAIN
471 /*
472 * This is used for testing apcups in a standalone mode.
473 * Usefull for debugging.
474 */
475 int main (int argc, char **argv)
476 {
477 /* we are not really going to use this */
478 struct apc_detail_s apcups_detail;
480 openlog ("apcups", LOG_PID | LOG_NDELAY | LOG_LOCAL1, LOG_USER);
482 if (global_host == NULL || strcmp (global_host, "0.0.0.0") == 0)
483 global_host = "localhost";
485 if(apc_query_server (global_host, global_port, &apcups_detail) < 0)
486 {
487 printf("apcups: Failed...\n");
488 return(-1);
489 }
491 return 0;
492 }
493 #else
494 static int apcups_config (char *key, char *value)
495 {
496 if (strcasecmp (key, "host") == 0)
497 {
498 if (global_host != NULL)
499 {
500 free (global_host);
501 global_host = NULL;
502 }
503 if ((global_host = strdup (value)) == NULL)
504 return (1);
505 }
506 else if (strcasecmp (key, "Port") == 0)
507 {
508 int port_tmp = atoi (value);
509 if (port_tmp < 1 || port_tmp > 65535)
510 {
511 syslog (LOG_WARNING, "apcups plugin: Invalid port: %i", port_tmp);
512 return (1);
513 }
514 global_port = port_tmp;
515 }
516 else
517 {
518 return (-1);
519 }
520 return (0);
521 }
523 static void apcups_init (void)
524 {
525 return;
526 }
528 static void apc_write_voltage (char *host, char *inst, char *val)
529 {
530 char file[512];
531 int status;
533 status = snprintf (file, 512, bvolt_file_template, inst);
534 if ((status < 1) || (status >= 512))
535 return;
537 rrd_update_file (host, file, val, bvolt_ds_def, bvolt_ds_num);
538 }
540 static void apc_write_charge (char *host, char *inst, char *val)
541 {
542 rrd_update_file (host, charge_file_template, val, charge_ds_def, charge_ds_num);
543 }
545 static void apc_write_percent (char *host, char *inst, char *val)
546 {
547 rrd_update_file (host, load_file_template, val, load_ds_def, load_ds_num);
548 }
550 static void apc_write_timeleft (char *host, char *inst, char *val)
551 {
552 rrd_update_file (host, time_file_template, val, time_ds_def, time_ds_num);
553 }
555 static void apc_write_temperature (char *host, char *inst, char *val)
556 {
557 rrd_update_file (host, temp_file_template, val, temp_ds_def, temp_ds_num);
558 }
560 static void apc_write_frequency (char *host, char *inst, char *val)
561 {
562 char file[512];
563 int status;
565 status = snprintf (file, 512, freq_file_template, inst);
566 if ((status < 1) || (status >= 512))
567 return;
569 rrd_update_file (host, file, val, freq_ds_def, freq_ds_num);
570 }
572 static void apc_submit_generic (char *type, char *inst,
573 double value)
574 {
575 char buf[512];
576 int status;
578 status = snprintf (buf, 512, "%u:%f",
579 (unsigned int) curtime, value);
580 if ((status < 1) || (status >= 512))
581 return;
583 DBG ("plugin_submit (%s, %s, %s);", type, inst, buf);
584 plugin_submit (type, inst, buf);
585 }
587 static void apc_submit (struct apc_detail_s *apcups_detail)
588 {
589 apc_submit_generic ("apcups_voltage", "input", apcups_detail->linev);
590 apc_submit_generic ("apcups_voltage", "output", apcups_detail->outputv);
591 apc_submit_generic ("apcups_voltage", "battery", apcups_detail->battv);
592 apc_submit_generic ("apcups_charge", "-", apcups_detail->bcharge);
593 apc_submit_generic ("apcups_charge_pct", "-", apcups_detail->loadpct);
594 apc_submit_generic ("apcups_timeleft", "-", apcups_detail->timeleft);
595 apc_submit_generic ("apcups_temp", "-", apcups_detail->itemp);
596 apc_submit_generic ("apcups_frequency", "input", apcups_detail->linefreq);
597 }
599 static void apcups_read (void)
600 {
601 struct apc_detail_s apcups_detail;
602 int status;
604 apcups_detail.linev = -1.0;
605 apcups_detail.outputv = -1.0;
606 apcups_detail.battv = -1.0;
607 apcups_detail.loadpct = -1.0;
608 apcups_detail.bcharge = -1.0;
609 apcups_detail.timeleft = -1.0;
610 apcups_detail.itemp = -300.0;
611 apcups_detail.linefreq = -1.0;
613 status = apc_query_server (global_host == NULL
614 ? APCUPS_DEFAULT_HOST
615 : global_host,
616 global_port, &apcups_detail);
618 /*
619 * if we did not connect then do not bother submitting
620 * zeros. We want rrd files to have NAN.
621 */
622 if (status != 0)
623 {
624 DBG ("apc_query_server (%s, %i) = %i",
625 global_host == NULL
626 ? APCUPS_DEFAULT_HOST
627 : global_host,
628 global_port, status);
629 return;
630 }
632 apc_submit (&apcups_detail);
633 } /* apcups_read */
635 void module_register (void)
636 {
637 plugin_register (MODULE_NAME, apcups_init, apcups_read, NULL);
638 plugin_register ("apcups_voltage", NULL, NULL, apc_write_voltage);
639 plugin_register ("apcups_charge", NULL, NULL, apc_write_charge);
640 plugin_register ("apcups_charge_pct", NULL, NULL, apc_write_percent);
641 plugin_register ("apcups_timeleft", NULL, NULL, apc_write_timeleft);
642 plugin_register ("apcups_temp", NULL, NULL, apc_write_temperature);
643 plugin_register ("apcups_frequency", NULL, NULL, apc_write_frequency);
644 cf_register (MODULE_NAME, apcups_config, config_keys, config_keys_num);
645 }
647 #endif /* if APCMAIN */
648 #undef MODULE_NAME