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"
37 #include <errno.h>
39 #if HAVE_SYS_TYPES_H
40 # include <sys/types.h>
41 #endif
42 #if HAVE_SYS_SOCKET_H
43 # include <sys/socket.h>
44 #endif
45 #if HAVE_NETDB_H
46 # include <netdb.h>
47 #endif
49 #if HAVE_NETINET_IN_H
50 # include <netinet/in.h>
51 #endif
53 #ifndef APCMAIN
54 # define APCMAIN 0
55 #endif
57 #define NISPORT 3551
58 #define MAXSTRING 256
59 #define MODULE_NAME "apcups"
61 /* Default values for contacting daemon */
62 static char *global_host = "localhost";
63 static int global_port = NISPORT;
65 /*
66 * The following are only if not compiled to test the module with its own main.
67 */
68 #if !APCMAIN
69 static char *bvolt_file_template = "apcups/voltage-%s.rrd";
70 static char *bvolt_ds_def[] =
71 {
72 "DS:voltage:GAUGE:"COLLECTD_HEARTBEAT":0:U",
73 };
74 static int bvolt_ds_num = 1;
76 static char *load_file_template = "apcups/charge_percent.rrd";
77 static char *load_ds_def[] =
78 {
79 "DS:percent:GAUGE:"COLLECTD_HEARTBEAT":0:110",
80 };
81 static int load_ds_num = 1;
83 static char *charge_file_template = "apcups/charge.rrd";
84 static char *charge_ds_def[] =
85 {
86 "DS:charge:GAUGE:"COLLECTD_HEARTBEAT":0:U",
87 };
88 static int charge_ds_num = 1;
90 static char *time_file_template = "apcups/time.rrd";
91 static char *time_ds_def[] =
92 {
93 "DS:timeleft:GAUGE:"COLLECTD_HEARTBEAT":0:100",
94 };
95 static int time_ds_num = 1;
97 static char *temp_file_template = "apcups/temperature.rrd";
98 static char *temp_ds_def[] =
99 {
100 /* -273.15 is absolute zero */
101 "DS:temperature:GAUGE:"COLLECTD_HEARTBEAT":-274:U",
102 };
103 static int temp_ds_num = 1;
105 static char *freq_file_template = "apcups/frequency-%s.rrd";
106 static char *freq_ds_def[] =
107 {
108 "DS:frequency:GAUGE:"COLLECTD_HEARTBEAT":0:U",
109 };
110 static int freq_ds_num = 1;
112 static char *config_keys[] =
113 {
114 "Host",
115 "Port",
116 NULL
117 };
118 static int config_keys_num = 2;
120 #endif /* if APCMAIN */
122 struct apc_detail_s
123 {
124 double linev;
125 double loadpct;
126 double bcharge;
127 double timeleft;
128 double outputv;
129 double itemp;
130 double battv;
131 double linefreq;
132 };
134 #define BIG_BUF 4096
136 /*
137 * Read nbytes from the network.
138 * It is possible that the total bytes require in several
139 * read requests
140 */
141 static int read_nbytes (int *fd, char *ptr, int nbytes)
142 {
143 int nleft;
144 int nread;
146 nleft = nbytes;
147 nread = -1;
149 assert (*fd >= 0);
151 while ((nleft > 0) && (nread != 0))
152 {
153 nread = read (*fd, ptr, nleft);
155 if (nread == -1 && (errno == EINTR || errno == EAGAIN))
156 continue;
158 if (nread == -1)
159 {
160 *fd = -1;
161 syslog (LOG_ERR, "apcups plugin: write failed: %s", strerror (errno));
162 return (-1);
163 }
165 nleft -= nread;
166 ptr += nread;
167 }
169 return (nbytes - nleft);
170 }
172 /*
173 * Write nbytes to the network.
174 * It may require several writes.
175 */
176 static int write_nbytes (int *fd, void *buf, int buflen)
177 {
178 int nleft;
179 int nwritten;
180 char *ptr;
182 assert (buflen > 0);
183 assert (*fd >= 0);
185 ptr = (char *) buf;
187 nleft = buflen;
188 while (nleft > 0)
189 {
190 nwritten = write (*fd, ptr, nleft);
192 if ((nwritten == -1) && ((errno == EAGAIN) || (errno == EINTR)))
193 continue;
195 if (nwritten == -1)
196 {
197 syslog (LOG_ERR, "Writing to socket failed: %s", strerror (errno));
198 *fd = -1;
199 return (-1);
200 }
202 nleft -= nwritten;
203 ptr += nwritten;
204 }
206 /* If we get here, (nleft <= 0) is true */
207 return (buflen);
208 }
210 /* Close the network connection */
211 static void net_close (int *fd)
212 {
213 short pktsiz = 0;
215 assert (*fd >= 0);
217 /* send EOF sentinel */
218 write_nbytes (fd, &pktsiz, sizeof (short));
220 close (*fd);
221 *fd = -1;
222 }
225 /*
226 * Open a TCP connection to the UPS network server
227 * Returns -1 on error
228 * Returns socket file descriptor otherwise
229 */
230 static int net_open (char *host, char *service, int port)
231 {
232 int sd;
233 int status;
234 char port_str[8];
235 struct addrinfo ai_hints;
236 struct addrinfo *ai_return;
237 struct addrinfo *ai_list;
239 assert ((port > 0x00000000) && (port <= 0x0000FFFF));
241 /* Convert the port to a string */
242 snprintf (port_str, 8, "%i", port);
243 port_str[7] = '\0';
245 /* Resolve name */
246 memset ((void *) &ai_hints, '\0', sizeof (ai_hints));
247 ai_hints.ai_family = AF_INET; /* XXX: Change this to `AF_UNSPEC' if apcupsd can handle IPv6 */
248 ai_hints.ai_socktype = SOCK_STREAM;
250 status = getaddrinfo (host, port_str, &ai_hints, &ai_return);
251 if (status != 0)
252 {
253 DBG ("getaddrinfo failed: %s", status == EAI_SYSTEM ? strerror (errno) : gai_strerror (status));
254 return (-1);
255 }
257 /* Create socket */
258 sd = -1;
259 for (ai_list = ai_return; ai_list != NULL; ai_list = ai_list->ai_next)
260 {
261 sd = socket (ai_list->ai_family, ai_list->ai_socktype, ai_list->ai_protocol);
262 if (sd >= 0)
263 break;
264 }
265 /* `ai_list' still holds the current description of the socket.. */
267 if (sd < 0)
268 {
269 DBG ("Unable to open a socket");
270 freeaddrinfo (ai_return);
271 return (-1);
272 }
274 status = connect (sd, ai_list->ai_addr, ai_list->ai_addrlen);
276 freeaddrinfo (ai_return);
278 if (status != 0) /* `connect(2)' failed */
279 {
280 DBG ("connect failed: %s", strerror (errno));
281 return (-1);
282 }
284 return (sd);
285 } /* int net_open (char *host, char *service, int port) */
287 /*
288 * Receive a message from the other end. Each message consists of
289 * two packets. The first is a header that contains the size
290 * of the data that follows in the second packet.
291 * Returns number of bytes read
292 * Returns 0 on end of file
293 * Returns -1 on hard end of file (i.e. network connection close)
294 * Returns -2 on error
295 */
296 static int net_recv (int *sockfd, char *buf, int buflen)
297 {
298 int nbytes;
299 short pktsiz;
301 /* get data size -- in short */
302 if ((nbytes = read_nbytes (sockfd, (char *) &pktsiz, sizeof (short))) <= 0)
303 return (-1);
305 if (nbytes != sizeof (short))
306 return (-2);
308 pktsiz = ntohs (pktsiz);
309 if (pktsiz > buflen)
310 {
311 DBG ("record length too large");
312 return (-2);
313 }
315 if (pktsiz == 0)
316 return (0);
318 /* now read the actual data */
319 if ((nbytes = read_nbytes (sockfd, buf, pktsiz)) <= 0)
320 return (-2);
322 if (nbytes != pktsiz)
323 return (-2);
325 return (nbytes);
326 } /* static int net_recv (int sockfd, char *buf, int buflen) */
328 /*
329 * Send a message over the network. The send consists of
330 * two network packets. The first is sends a short containing
331 * the length of the data packet which follows.
332 * Returns zero on success
333 * Returns non-zero on error
334 */
335 static int net_send (int *sockfd, char *buff, int len)
336 {
337 int rc;
338 short packet_size;
340 assert (len > 0);
342 /* send short containing size of data packet */
343 packet_size = htons ((short) len);
345 rc = write_nbytes (sockfd, &packet_size, sizeof (packet_size));
346 if (rc != sizeof (packet_size))
347 return (-1);
349 /* send data packet */
350 rc = write_nbytes (sockfd, buff, len);
351 if (rc != len)
352 return (-1);
354 return (0);
355 }
357 /* Get and print status from apcupsd NIS server */
358 static int apc_query_server (char *host, int port,
359 struct apc_detail_s *apcups_detail)
360 {
361 int n;
362 char recvline[1024];
363 char *tokptr;
364 char *key;
365 double value;
367 static int sockfd = -1;
368 static unsigned int complain = 0;
370 #if APCMAIN
371 # define PRINT_VALUE(name, val) printf(" Found property: name = %s; value = %f;\n", name, val)
372 #else
373 # define PRINT_VALUE(name, val) /**/
374 #endif
376 if (sockfd < 0)
377 {
378 if ((sockfd = net_open (host, NULL, port)) < 0)
379 {
380 /* Complain first time and once every six hours. */
381 int complain_step = 21600 / atoi (COLLECTD_STEP);
383 if (complain == 0 || (complain % complain_step) == 0)
384 syslog (LOG_ERR, "apcups plugin: Connecting to the apcupsd failed.");
385 complain++;
387 return (-1);
388 } else {
389 if(complain > 1)
390 syslog (LOG_ERR, "apcups plugin: Connection re-established to the apcupsd.");
391 }
392 complain = 0;
393 }
395 if (net_send (&sockfd, "status", 6) < 0)
396 {
397 syslog (LOG_ERR, "apcups plugin: Writing to the socket failed.");
398 return (-1);
399 }
401 /* XXX: Do we read `n' or `n-1' bytes? */
402 while ((n = net_recv (&sockfd, recvline, sizeof (recvline) - 1)) > 0)
403 {
404 assert (n < sizeof (recvline));
405 recvline[n] = '\0';
406 #if APCMAIN
407 printf ("net_recv = `%s';\n", recvline);
408 #endif /* if APCMAIN */
410 tokptr = strtok (recvline, ":");
411 while (tokptr != NULL)
412 {
413 key = tokptr;
414 if ((tokptr = strtok (NULL, " \t")) == NULL)
415 continue;
416 value = atof (tokptr);
417 PRINT_VALUE (key, value);
419 if (strcmp ("LINEV", key) == 0)
420 apcups_detail->linev = value;
421 else if (strcmp ("BATTV", tokptr) == 0)
422 apcups_detail->battv = value;
423 else if (strcmp ("ITEMP", tokptr) == 0)
424 apcups_detail->itemp = value;
425 else if (strcmp ("LOADPCT", tokptr) == 0)
426 apcups_detail->loadpct = value;
427 else if (strcmp ("BCHARGE", tokptr) == 0)
428 apcups_detail->bcharge = value;
429 else if (strcmp ("OUTPUTV", tokptr) == 0)
430 apcups_detail->outputv = value;
431 else if (strcmp ("LINEFREQ", tokptr) == 0)
432 apcups_detail->linefreq = value;
433 else if (strcmp ("TIMELEFT", tokptr) == 0)
434 apcups_detail->timeleft = value;
436 tokptr = strtok (NULL, ":");
437 } /* while (tokptr != NULL) */
438 }
440 if (n < 0)
441 {
442 syslog (LOG_WARNING, "apcups plugin: Error reading from socket");
443 return (-1);
444 } else {
445 /* close the opened socket */
446 net_close(&sockfd);
447 }
450 return (0);
451 }
453 #if APCMAIN
454 /*
455 * This is used for testing apcups in a standalone mode.
456 * Usefull for debugging.
457 */
458 int main (int argc, char **argv)
459 {
460 /* we are not really going to use this */
461 struct apc_detail_s apcups_detail;
463 openlog ("apcups", LOG_PID | LOG_NDELAY | LOG_LOCAL1, LOG_USER);
465 if (global_host == NULL || strcmp (global_host, "0.0.0.0") == 0)
466 global_host = "localhost";
468 if(apc_query_server (global_host, global_port, &apcups_detail) < 0)
469 {
470 printf("apcups: Failed...\n");
471 return(-1);
472 }
474 return 0;
475 }
476 #else
477 static int apcups_config (char *key, char *value)
478 {
479 if (strcasecmp (key, "host") == 0)
480 {
481 if (global_host != NULL)
482 {
483 free (global_host);
484 global_host = NULL;
485 }
486 if ((global_host = strdup (value)) == NULL)
487 return (1);
488 }
489 else if (strcasecmp (key, "Port") == 0)
490 {
491 int port_tmp = atoi (value);
492 if (port_tmp < 1 || port_tmp > 65535)
493 {
494 syslog (LOG_WARNING, "apcups plugin: Invalid port: %i", port_tmp);
495 return (1);
496 }
497 global_port = port_tmp;
498 }
499 else
500 {
501 return (-1);
502 }
503 return (0);
504 }
506 static void apcups_init (void)
507 {
508 return;
509 }
511 static void apc_write_voltage (char *host, char *inst, char *val)
512 {
513 char file[512];
514 int status;
516 status = snprintf (file, 512, bvolt_file_template, inst);
517 if ((status < 1) || (status >= 512))
518 return;
520 rrd_update_file (host, file, val, bvolt_ds_def, bvolt_ds_num);
521 }
523 static void apc_write_charge (char *host, char *inst, char *val)
524 {
525 rrd_update_file (host, charge_file_template, val, charge_ds_def, charge_ds_num);
526 }
528 static void apc_write_percent (char *host, char *inst, char *val)
529 {
530 rrd_update_file (host, load_file_template, val, load_ds_def, load_ds_num);
531 }
533 static void apc_write_timeleft (char *host, char *inst, char *val)
534 {
535 rrd_update_file (host, time_file_template, val, time_ds_def, time_ds_num);
536 }
538 static void apc_write_temperature (char *host, char *inst, char *val)
539 {
540 rrd_update_file (host, temp_file_template, val, temp_ds_def, temp_ds_num);
541 }
543 static void apc_write_frequency (char *host, char *inst, char *val)
544 {
545 char file[512];
546 int status;
548 status = snprintf (file, 512, freq_file_template, inst);
549 if ((status < 1) || (status >= 512))
550 return;
552 rrd_update_file (host, file, val, freq_ds_def, freq_ds_num);
553 }
555 static void apc_submit_generic (char *type, char *inst,
556 double value)
557 {
558 char buf[512];
559 int status;
561 status = snprintf (buf, 512, "%u:%f",
562 (unsigned int) curtime, value);
563 if ((status < 1) || (status >= 512))
564 return;
566 plugin_submit (type, inst, buf);
567 }
569 static void apc_submit (struct apc_detail_s *apcups_detail)
570 {
571 apc_submit_generic ("apcups_voltage", "input", apcups_detail->linev);
572 apc_submit_generic ("apcups_voltage", "output", apcups_detail->outputv);
573 apc_submit_generic ("apcups_voltage", "battery", apcups_detail->battv);
574 apc_submit_generic ("apcups_charge", "-", apcups_detail->bcharge);
575 apc_submit_generic ("apcups_charge_pct", "-", apcups_detail->loadpct);
576 apc_submit_generic ("apcups_timeleft", "-", apcups_detail->timeleft);
577 apc_submit_generic ("apcups_temp", "-", apcups_detail->itemp);
578 apc_submit_generic ("apcups_frequency", "input", apcups_detail->linefreq);
579 }
581 static void apcups_read (void)
582 {
583 struct apc_detail_s apcups_detail;
584 int status;
586 if (global_host == NULL)
587 return;
589 apcups_detail.linev = -1.0;
590 apcups_detail.outputv = -1.0;
591 apcups_detail.battv = -1.0;
592 apcups_detail.loadpct = -1.0;
593 apcups_detail.bcharge = -1.0;
594 apcups_detail.timeleft = -1.0;
595 apcups_detail.itemp = -300.0;
596 apcups_detail.linefreq = -1.0;
598 status = apc_query_server (global_host, global_port, &apcups_detail);
600 /*
601 * if we did not connect then do not bother submitting
602 * zeros. We want rrd files to have NAN.
603 */
604 if (status != 0)
605 return;
607 apc_submit (&apcups_detail);
608 } /* apcups_read */
610 void module_register (void)
611 {
612 plugin_register (MODULE_NAME, apcups_init, apcups_read, NULL);
613 plugin_register ("apcups_voltage", NULL, NULL, apc_write_voltage);
614 plugin_register ("apcups_charge", NULL, NULL, apc_write_charge);
615 plugin_register ("apcups_charge_pct", NULL, NULL, apc_write_percent);
616 plugin_register ("apcups_timeleft", NULL, NULL, apc_write_timeleft);
617 plugin_register ("apcups_temp", NULL, NULL, apc_write_temperature);
618 plugin_register ("apcups_frequency", NULL, NULL, apc_write_frequency);
619 cf_register (MODULE_NAME, apcups_config, config_keys, config_keys_num);
620 }
622 #endif /* if APCMAIN */
623 #undef MODULE_NAME