1 /**
2 * collectd - src/modbus.c
3 * Copyright (C) 2010,2011 noris network AG
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU Lesser General Public License as published by
7 * the Free Software Foundation; only version 2.1 of the License is
8 * applicable.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with this program; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 * Authors:
20 * Florian Forster <octo at noris.net>
21 **/
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "configfile.h"
28 #include <netdb.h>
30 #include <modbus.h>
32 #ifndef LIBMODBUS_VERSION_CHECK
33 /* Assume version 2.0.3 */
34 # define LEGACY_LIBMODBUS 1
35 #else
36 /* Assume version 2.9.2 */
37 #endif
39 #ifndef MODBUS_TCP_DEFAULT_PORT
40 # ifdef MODBUS_TCP_PORT
41 # define MODBUS_TCP_DEFAULT_PORT MODBUS_TCP_PORT
42 # else
43 # define MODBUS_TCP_DEFAULT_PORT 502
44 # endif
45 #endif
47 /*
48 * <Data "data_name">
49 * RegisterBase 1234
50 * RegisterCmd ReadHolding
51 * RegisterType float
52 * Type gauge
53 * Instance "..."
54 * </Data>
55 *
56 * <Host "name">
57 * Address "addr"
58 * Port "1234"
59 * # Or:
60 * # Device "/dev/ttyUSB0"
61 * # Baudrate 38400
62 * # (Assumes 8N1)
63 * Interval 60
64 *
65 * <Slave 1>
66 * Instance "foobar" # optional
67 * Collect "data_name"
68 * </Slave>
69 * </Host>
70 */
72 /*
73 * Data structures
74 */
75 enum mb_register_type_e /* {{{ */
76 {
77 REG_TYPE_INT16,
78 REG_TYPE_INT32,
79 REG_TYPE_UINT16,
80 REG_TYPE_UINT32,
81 REG_TYPE_FLOAT
82 }; /* }}} */
83 enum mb_mreg_type_e /* {{{ */
84 {
85 MREG_HOLDING,
86 MREG_INPUT
87 }; /* }}} */
88 typedef enum mb_register_type_e mb_register_type_t;
89 typedef enum mb_mreg_type_e mb_mreg_type_t;
91 /* TCP or RTU depending on what is specified in host config block */
92 enum mb_conntype_e /* {{{ */
93 {
94 MBCONN_TCP,
95 MBCONN_RTU
96 }; /* }}} */
97 typedef enum mb_conntype_e mb_conntype_t;
99 struct mb_data_s;
100 typedef struct mb_data_s mb_data_t;
101 struct mb_data_s /* {{{ */
102 {
103 char *name;
104 int register_base;
105 mb_register_type_t register_type;
106 mb_mreg_type_t modbus_register_type;
107 char type[DATA_MAX_NAME_LEN];
108 char instance[DATA_MAX_NAME_LEN];
110 mb_data_t *next;
111 }; /* }}} */
113 struct mb_slave_s /* {{{ */
114 {
115 int id;
116 char instance[DATA_MAX_NAME_LEN];
117 mb_data_t *collect;
118 }; /* }}} */
119 typedef struct mb_slave_s mb_slave_t;
121 struct mb_host_s /* {{{ */
122 {
123 char host[DATA_MAX_NAME_LEN];
124 char node[NI_MAXHOST]; /* TCP hostname or RTU serial device */
125 /* char service[NI_MAXSERV]; */
126 int port; /* for Modbus/TCP */
127 int baudrate; /* for Modbus/RTU */
128 mb_conntype_t conntype;
129 cdtime_t interval;
131 mb_slave_t *slaves;
132 size_t slaves_num;
134 #if LEGACY_LIBMODBUS
135 modbus_param_t connection;
136 #else
137 modbus_t *connection;
138 #endif
139 _Bool is_connected;
140 }; /* }}} */
141 typedef struct mb_host_s mb_host_t;
143 struct mb_data_group_s;
144 typedef struct mb_data_group_s mb_data_group_t;
145 struct mb_data_group_s /* {{{ */
146 {
147 mb_data_t *registers;
148 size_t registers_num;
150 mb_data_group_t *next;
151 }; /* }}} */
153 /*
154 * Global variables
155 */
156 static mb_data_t *data_definitions = NULL;
158 /*
159 * Functions
160 */
161 static mb_data_t *data_get_by_name (mb_data_t *src, /* {{{ */
162 const char *name)
163 {
164 mb_data_t *ptr;
166 if (name == NULL)
167 return (NULL);
169 for (ptr = src; ptr != NULL; ptr = ptr->next)
170 if (strcasecmp (ptr->name, name) == 0)
171 return (ptr);
173 return (NULL);
174 } /* }}} mb_data_t *data_get_by_name */
176 static int data_append (mb_data_t **dst, mb_data_t *src) /* {{{ */
177 {
178 mb_data_t *ptr;
180 if ((dst == NULL) || (src == NULL))
181 return (EINVAL);
183 ptr = *dst;
185 if (ptr == NULL)
186 {
187 *dst = src;
188 return (0);
189 }
191 while (ptr->next != NULL)
192 ptr = ptr->next;
194 ptr->next = src;
196 return (0);
197 } /* }}} int data_append */
199 /* Copy a single mb_data_t and append it to another list. */
200 static int data_copy (mb_data_t **dst, const mb_data_t *src) /* {{{ */
201 {
202 mb_data_t *tmp;
203 int status;
205 if ((dst == NULL) || (src == NULL))
206 return (EINVAL);
208 tmp = malloc (sizeof (*tmp));
209 if (tmp == NULL)
210 return (ENOMEM);
211 memcpy (tmp, src, sizeof (*tmp));
212 tmp->name = NULL;
213 tmp->next = NULL;
215 tmp->name = strdup (src->name);
216 if (tmp->name == NULL)
217 {
218 sfree (tmp);
219 return (ENOMEM);
220 }
222 status = data_append (dst, tmp);
223 if (status != 0)
224 {
225 sfree (tmp->name);
226 sfree (tmp);
227 return (status);
228 }
230 return (0);
231 } /* }}} int data_copy */
233 /* Lookup a single mb_data_t instance, copy it and append the copy to another
234 * list. */
235 static int data_copy_by_name (mb_data_t **dst, mb_data_t *src, /* {{{ */
236 const char *name)
237 {
238 mb_data_t *ptr;
240 if ((dst == NULL) || (src == NULL) || (name == NULL))
241 return (EINVAL);
243 ptr = data_get_by_name (src, name);
244 if (ptr == NULL)
245 return (ENOENT);
247 return (data_copy (dst, ptr));
248 } /* }}} int data_copy_by_name */
250 /* Read functions */
252 static int mb_submit (mb_host_t *host, mb_slave_t *slave, /* {{{ */
253 mb_data_t *data, value_t value)
254 {
255 value_list_t vl = VALUE_LIST_INIT;
257 if ((host == NULL) || (slave == NULL) || (data == NULL))
258 return (EINVAL);
260 if (host->interval == 0)
261 host->interval = plugin_get_interval ();
263 if (slave->instance[0] == 0)
264 ssnprintf (slave->instance, sizeof (slave->instance), "slave_%i",
265 slave->id);
267 vl.values = &value;
268 vl.values_len = 1;
269 vl.interval = host->interval;
270 sstrncpy (vl.host, host->host, sizeof (vl.host));
271 sstrncpy (vl.plugin, "modbus", sizeof (vl.plugin));
272 sstrncpy (vl.plugin_instance, slave->instance, sizeof (vl.plugin_instance));
273 sstrncpy (vl.type, data->type, sizeof (vl.type));
274 sstrncpy (vl.type_instance, data->instance, sizeof (vl.type_instance));
276 return (plugin_dispatch_values (&vl));
277 } /* }}} int mb_submit */
279 static float mb_register_to_float (uint16_t hi, uint16_t lo) /* {{{ */
280 {
281 union
282 {
283 uint8_t b[4];
284 uint16_t s[2];
285 float f;
286 } conv;
288 #if BYTE_ORDER == LITTLE_ENDIAN
289 /* little endian */
290 conv.b[0] = lo & 0x00ff;
291 conv.b[1] = (lo >> 8) & 0x00ff;
292 conv.b[2] = hi & 0x00ff;
293 conv.b[3] = (hi >> 8) & 0x00ff;
294 #else
295 conv.b[3] = lo & 0x00ff;
296 conv.b[2] = (lo >> 8) & 0x00ff;
297 conv.b[1] = hi & 0x00ff;
298 conv.b[0] = (hi >> 8) & 0x00ff;
299 #endif
301 return (conv.f);
302 } /* }}} float mb_register_to_float */
304 #if LEGACY_LIBMODBUS
305 /* Version 2.0.3 */
306 static int mb_init_connection (mb_host_t *host) /* {{{ */
307 {
308 int status;
310 if (host == NULL)
311 return (EINVAL);
313 #if COLLECT_DEBUG
314 modbus_set_debug (&host->connection, 1);
315 #endif
317 /* We'll do the error handling ourselves. */
318 modbus_set_error_handling (&host->connection, NOP_ON_ERROR);
320 if (host->conntype == MBCONN_TCP)
321 {
322 if ((host->port < 1) || (host->port > 65535))
323 host->port = MODBUS_TCP_DEFAULT_PORT;
325 DEBUG ("Modbus plugin: Trying to connect to \"%s\", port %i.",
326 host->node, host->port);
328 modbus_init_tcp (&host->connection,
329 /* host = */ host->node,
330 /* port = */ host->port);
331 }
332 else /* MBCONN_RTU */
333 {
334 DEBUG ("Modbus plugin: Trying to connect to \"%s\".", host->node);
336 modbus_init_rtu (&host->connection,
337 /* device = */ host->node,
338 /* baudrate = */ host->baudrate,
339 'N', 8, 1, 0);
340 }
342 status = modbus_connect (&host->connection);
343 if (status != 0)
344 {
345 ERROR ("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
346 host->node, host->port ? host->port : host->baudrate, status);
347 return (status);
348 }
350 host->is_connected = 1;
351 return (0);
352 } /* }}} int mb_init_connection */
353 /* #endif LEGACY_LIBMODBUS */
355 #else /* if !LEGACY_LIBMODBUS */
356 /* Version 2.9.2 */
357 static int mb_init_connection (mb_host_t *host) /* {{{ */
358 {
359 int status;
361 if (host == NULL)
362 return (EINVAL);
364 if (host->connection != NULL)
365 return (0);
367 if (host->conntype == MBCONN_TCP)
368 {
369 if ((host->port < 1) || (host->port > 65535))
370 host->port = MODBUS_TCP_DEFAULT_PORT;
372 DEBUG ("Modbus plugin: Trying to connect to \"%s\", port %i.",
373 host->node, host->port);
375 host->connection = modbus_new_tcp (host->node, host->port);
376 if (host->connection == NULL)
377 {
378 ERROR ("Modbus plugin: Creating new Modbus/TCP object failed.");
379 return (-1);
380 }
381 }
382 else
383 {
384 DEBUG ("Modbus plugin: Trying to connect to \"%s\", baudrate %i.",
385 host->node, host->baudrate);
387 host->connection = modbus_new_rtu (host->node, host->baudrate, 'N', 8, 1);
388 if (host->connection == NULL)
389 {
390 ERROR ("Modbus plugin: Creating new Modbus/RTU object failed.");
391 return (-1);
392 }
393 }
395 #if COLLECT_DEBUG
396 modbus_set_debug (host->connection, 1);
397 #endif
399 /* We'll do the error handling ourselves. */
400 modbus_set_error_recovery (host->connection, 0);
402 status = modbus_connect (host->connection);
403 if (status != 0)
404 {
405 ERROR ("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
406 host->node, host->port ? host->port : host->baudrate, status);
407 modbus_free (host->connection);
408 host->connection = NULL;
409 return (status);
410 }
412 return (0);
413 } /* }}} int mb_init_connection */
414 #endif /* !LEGACY_LIBMODBUS */
416 #define CAST_TO_VALUE_T(ds,vt,raw) do { \
417 if ((ds)->ds[0].type == DS_TYPE_COUNTER) \
418 (vt).counter = (counter_t) (raw); \
419 else if ((ds)->ds[0].type == DS_TYPE_GAUGE) \
420 (vt).gauge = (gauge_t) (raw); \
421 else if ((ds)->ds[0].type == DS_TYPE_DERIVE) \
422 (vt).derive = (derive_t) (raw); \
423 else /* if (ds->ds[0].type == DS_TYPE_ABSOLUTE) */ \
424 (vt).absolute = (absolute_t) (raw); \
425 } while (0)
427 static int mb_read_data (mb_host_t *host, mb_slave_t *slave, /* {{{ */
428 mb_data_t *data)
429 {
430 uint16_t values[2] = { 0 };
431 int values_num;
432 const data_set_t *ds;
433 int status = 0;
435 if ((host == NULL) || (slave == NULL) || (data == NULL))
436 return (EINVAL);
438 ds = plugin_get_ds (data->type);
439 if (ds == NULL)
440 {
441 ERROR ("Modbus plugin: Type \"%s\" is not defined.", data->type);
442 return (-1);
443 }
445 if (ds->ds_num != 1)
446 {
447 ERROR ("Modbus plugin: The type \"%s\" has %zu data sources. "
448 "I can only handle data sets with only one data source.",
449 data->type, ds->ds_num);
450 return (-1);
451 }
453 if ((ds->ds[0].type != DS_TYPE_GAUGE)
454 && (data->register_type != REG_TYPE_INT32)
455 && (data->register_type != REG_TYPE_UINT32))
456 {
457 NOTICE ("Modbus plugin: The data source of type \"%s\" is %s, not gauge. "
458 "This will most likely result in problems, because the register type "
459 "is not UINT32.", data->type, DS_TYPE_TO_STRING (ds->ds[0].type));
460 }
462 if ((data->register_type == REG_TYPE_INT32)
463 || (data->register_type == REG_TYPE_UINT32)
464 || (data->register_type == REG_TYPE_FLOAT))
465 values_num = 2;
466 else
467 values_num = 1;
469 if (host->connection == NULL)
470 {
471 status = EBADF;
472 }
473 else if (host->conntype == MBCONN_TCP)
474 {
475 struct sockaddr sockaddr;
476 socklen_t saddrlen = sizeof (sockaddr);
478 status = getpeername (modbus_get_socket (host->connection),
479 &sockaddr, &saddrlen);
480 if (status != 0)
481 status = errno;
482 }
484 if ((status == EBADF) || (status == ENOTSOCK) || (status == ENOTCONN))
485 {
486 status = mb_init_connection (host);
487 if (status != 0)
488 {
489 ERROR ("Modbus plugin: mb_init_connection (%s/%s) failed. ",
490 host->host, host->node);
491 host->is_connected = 0;
492 host->connection = NULL;
493 return (-1);
494 }
495 }
496 else if (status != 0)
497 {
498 #if LEGACY_LIBMODBUS
499 modbus_close (&host->connection);
500 #else
501 modbus_close (host->connection);
502 modbus_free (host->connection);
503 #endif
504 }
506 #if LEGACY_LIBMODBUS
507 /* Version 2.0.3: Pass the connection struct as a pointer and pass the slave
508 * id to each call of "read_holding_registers". */
509 # define modbus_read_registers(ctx, addr, nb, dest) \
510 read_holding_registers (&(ctx), slave->id, (addr), (nb), (dest))
511 #else /* if !LEGACY_LIBMODBUS */
512 /* Version 2.9.2: Set the slave id once before querying the registers. */
513 status = modbus_set_slave (host->connection, slave->id);
514 if (status != 0)
515 {
516 ERROR ("Modbus plugin: modbus_set_slave (%i) failed with status %i.",
517 slave->id, status);
518 return (-1);
519 }
520 #endif
521 if (data->modbus_register_type == MREG_INPUT){
522 status = modbus_read_input_registers (host->connection,
523 /* start_addr = */ data->register_base,
524 /* num_registers = */ values_num, /* buffer = */ values);
525 }
526 else{
527 status = modbus_read_registers (host->connection,
528 /* start_addr = */ data->register_base,
529 /* num_registers = */ values_num, /* buffer = */ values);
530 }
531 if (status != values_num)
532 {
533 ERROR ("Modbus plugin: modbus read function (%s/%s) failed. "
534 " status = %i, values_num = %i. Giving up.",
535 host->host, host->node, status, values_num);
536 #if LEGACY_LIBMODBUS
537 modbus_close (&host->connection);
538 #else
539 modbus_close (host->connection);
540 modbus_free (host->connection);
541 #endif
542 host->connection = NULL;
543 return (-1);
544 }
546 DEBUG ("Modbus plugin: mb_read_data: Success! "
547 "modbus_read_registers returned with status %i.", status);
549 if (data->register_type == REG_TYPE_FLOAT)
550 {
551 float float_value;
552 value_t vt;
554 float_value = mb_register_to_float (values[0], values[1]);
555 DEBUG ("Modbus plugin: mb_read_data: "
556 "Returned float value is %g", (double) float_value);
558 CAST_TO_VALUE_T (ds, vt, float_value);
559 mb_submit (host, slave, data, vt);
560 }
561 else if (data->register_type == REG_TYPE_INT32)
562 {
563 union
564 {
565 uint32_t u32;
566 int32_t i32;
567 } v;
568 value_t vt;
570 v.u32 = (((uint32_t) values[0]) << 16)
571 | ((uint32_t) values[1]);
572 DEBUG ("Modbus plugin: mb_read_data: "
573 "Returned int32 value is %"PRIi32, v.i32);
575 CAST_TO_VALUE_T (ds, vt, v.i32);
576 mb_submit (host, slave, data, vt);
577 }
578 else if (data->register_type == REG_TYPE_INT16)
579 {
580 union
581 {
582 uint16_t u16;
583 int16_t i16;
584 } v;
585 value_t vt;
587 v.u16 = values[0];
589 DEBUG ("Modbus plugin: mb_read_data: "
590 "Returned int16 value is %"PRIi16, v.i16);
592 CAST_TO_VALUE_T (ds, vt, v.i16);
593 mb_submit (host, slave, data, vt);
594 }
595 else if (data->register_type == REG_TYPE_UINT32)
596 {
597 uint32_t v32;
598 value_t vt;
600 v32 = (((uint32_t) values[0]) << 16)
601 | ((uint32_t) values[1]);
602 DEBUG ("Modbus plugin: mb_read_data: "
603 "Returned uint32 value is %"PRIu32, v32);
605 CAST_TO_VALUE_T (ds, vt, v32);
606 mb_submit (host, slave, data, vt);
607 }
608 else /* if (data->register_type == REG_TYPE_UINT16) */
609 {
610 value_t vt;
612 DEBUG ("Modbus plugin: mb_read_data: "
613 "Returned uint16 value is %"PRIu16, values[0]);
615 CAST_TO_VALUE_T (ds, vt, values[0]);
616 mb_submit (host, slave, data, vt);
617 }
619 return (0);
620 } /* }}} int mb_read_data */
622 static int mb_read_slave (mb_host_t *host, mb_slave_t *slave) /* {{{ */
623 {
624 mb_data_t *data;
625 int success;
626 int status;
628 if ((host == NULL) || (slave == NULL))
629 return (EINVAL);
631 success = 0;
632 for (data = slave->collect; data != NULL; data = data->next)
633 {
634 status = mb_read_data (host, slave, data);
635 if (status == 0)
636 success++;
637 }
639 if (success == 0)
640 return (-1);
641 else
642 return (0);
643 } /* }}} int mb_read_slave */
645 static int mb_read (user_data_t *user_data) /* {{{ */
646 {
647 mb_host_t *host;
648 size_t i;
649 int success;
650 int status;
652 if ((user_data == NULL) || (user_data->data == NULL))
653 return (EINVAL);
655 host = user_data->data;
657 success = 0;
658 for (i = 0; i < host->slaves_num; i++)
659 {
660 status = mb_read_slave (host, host->slaves + i);
661 if (status == 0)
662 success++;
663 }
665 if (success == 0)
666 return (-1);
667 else
668 return (0);
669 } /* }}} int mb_read */
671 /* Free functions */
673 static void data_free_one (mb_data_t *data) /* {{{ */
674 {
675 if (data == NULL)
676 return;
678 sfree (data->name);
679 sfree (data);
680 } /* }}} void data_free_one */
682 static void data_free_all (mb_data_t *data) /* {{{ */
683 {
684 mb_data_t *next;
686 if (data == NULL)
687 return;
689 next = data->next;
690 data_free_one (data);
692 data_free_all (next);
693 } /* }}} void data_free_all */
695 static void slaves_free_all (mb_slave_t *slaves, size_t slaves_num) /* {{{ */
696 {
697 size_t i;
699 if (slaves == NULL)
700 return;
702 for (i = 0; i < slaves_num; i++)
703 data_free_all (slaves[i].collect);
704 sfree (slaves);
705 } /* }}} void slaves_free_all */
707 static void host_free (void *void_host) /* {{{ */
708 {
709 mb_host_t *host = void_host;
711 if (host == NULL)
712 return;
714 slaves_free_all (host->slaves, host->slaves_num);
715 sfree (host);
716 } /* }}} void host_free */
718 /* Config functions */
720 static int mb_config_add_data (oconfig_item_t *ci) /* {{{ */
721 {
722 mb_data_t data = { 0 };
723 int status;
724 int i;
726 data.name = NULL;
727 data.register_type = REG_TYPE_UINT16;
728 data.next = NULL;
730 status = cf_util_get_string (ci, &data.name);
731 if (status != 0)
732 return (status);
734 for (i = 0; i < ci->children_num; i++)
735 {
736 oconfig_item_t *child = ci->children + i;
738 if (strcasecmp ("Type", child->key) == 0)
739 status = cf_util_get_string_buffer (child,
740 data.type, sizeof (data.type));
741 else if (strcasecmp ("Instance", child->key) == 0)
742 status = cf_util_get_string_buffer (child,
743 data.instance, sizeof (data.instance));
744 else if (strcasecmp ("RegisterBase", child->key) == 0)
745 status = cf_util_get_int (child, &data.register_base);
746 else if (strcasecmp ("RegisterType", child->key) == 0)
747 {
748 char tmp[16];
749 status = cf_util_get_string_buffer (child, tmp, sizeof (tmp));
750 if (status != 0)
751 /* do nothing */;
752 else if (strcasecmp ("Int16", tmp) == 0)
753 data.register_type = REG_TYPE_INT16;
754 else if (strcasecmp ("Int32", tmp) == 0)
755 data.register_type = REG_TYPE_INT32;
756 else if (strcasecmp ("Uint16", tmp) == 0)
757 data.register_type = REG_TYPE_UINT16;
758 else if (strcasecmp ("Uint32", tmp) == 0)
759 data.register_type = REG_TYPE_UINT32;
760 else if (strcasecmp ("Float", tmp) == 0)
761 data.register_type = REG_TYPE_FLOAT;
762 else
763 {
764 ERROR ("Modbus plugin: The register type \"%s\" is unknown.", tmp);
765 status = -1;
766 }
767 }
768 else if (strcasecmp ("RegisterCmd", child->key) == 0)
769 {
770 #if LEGACY_LIBMODBUS
771 ERROR("Modbus plugin: RegisterCmd parameter can not be used "
772 "with your libmodbus version");
773 #else
774 char tmp[16];
775 status = cf_util_get_string_buffer (child, tmp, sizeof (tmp));
776 if (status != 0)
777 /* do nothing */;
778 else if (strcasecmp ("ReadHolding", tmp) == 0)
779 data.modbus_register_type = MREG_HOLDING;
780 else if (strcasecmp ("ReadInput", tmp) == 0)
781 data.modbus_register_type = MREG_INPUT;
782 else
783 {
784 ERROR ("Modbus plugin: The modbus_register_type \"%s\" is unknown.",
785 tmp);
786 status = -1;
787 }
788 #endif
789 }
790 else
791 {
792 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
793 status = -1;
794 }
796 if (status != 0)
797 break;
798 } /* for (i = 0; i < ci->children_num; i++) */
800 assert (data.name != NULL);
801 if (data.type[0] == 0)
802 {
803 ERROR ("Modbus plugin: Data block \"%s\": No type has been specified.",
804 data.name);
805 status = -1;
806 }
808 if (status == 0)
809 data_copy (&data_definitions, &data);
811 sfree (data.name);
813 return (status);
814 } /* }}} int mb_config_add_data */
816 static int mb_config_set_host_address (mb_host_t *host, /* {{{ */
817 const char *address)
818 {
819 struct addrinfo *ai_list;
820 struct addrinfo *ai_ptr;
821 struct addrinfo ai_hints = { 0 };
822 int status;
824 if ((host == NULL) || (address == NULL))
825 return (EINVAL);
827 #if AI_ADDRCONFIG
828 ai_hints.ai_flags |= AI_ADDRCONFIG;
829 #endif
830 /* XXX: libmodbus can only handle IPv4 addresses. */
831 ai_hints.ai_family = AF_INET;
832 ai_hints.ai_addr = NULL;
833 ai_hints.ai_canonname = NULL;
834 ai_hints.ai_next = NULL;
836 ai_list = NULL;
837 status = getaddrinfo (address, /* service = */ NULL,
838 &ai_hints, &ai_list);
839 if (status != 0)
840 {
841 char errbuf[1024];
842 ERROR ("Modbus plugin: getaddrinfo failed: %s",
843 (status == EAI_SYSTEM)
844 ? sstrerror (errno, errbuf, sizeof (errbuf))
845 : gai_strerror (status));
846 return (status);
847 }
849 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
850 {
851 status = getnameinfo (ai_ptr->ai_addr, ai_ptr->ai_addrlen,
852 host->node, sizeof (host->node),
853 /* service = */ NULL, /* length = */ 0,
854 /* flags = */ NI_NUMERICHOST);
855 if (status == 0)
856 break;
857 } /* for (ai_ptr) */
859 freeaddrinfo (ai_list);
861 if (status != 0)
862 ERROR ("Modbus plugin: Unable to translate node name: \"%s\"", address);
863 else /* if (status == 0) */
864 {
865 DEBUG ("Modbus plugin: mb_config_set_host_address: %s -> %s",
866 address, host->node);
867 }
869 return (status);
870 } /* }}} int mb_config_set_host_address */
872 static int mb_config_add_slave (mb_host_t *host, oconfig_item_t *ci) /* {{{ */
873 {
874 mb_slave_t *slave;
875 int status;
876 int i;
878 if ((host == NULL) || (ci == NULL))
879 return (EINVAL);
881 slave = realloc (host->slaves, sizeof (*slave) * (host->slaves_num + 1));
882 if (slave == NULL)
883 return (ENOMEM);
884 host->slaves = slave;
885 slave = host->slaves + host->slaves_num;
886 memset (slave, 0, sizeof (*slave));
887 slave->collect = NULL;
889 status = cf_util_get_int (ci, &slave->id);
890 if (status != 0)
891 return (status);
893 for (i = 0; i < ci->children_num; i++)
894 {
895 oconfig_item_t *child = ci->children + i;
897 if (strcasecmp ("Instance", child->key) == 0)
898 status = cf_util_get_string_buffer (child,
899 slave->instance, sizeof (slave->instance));
900 else if (strcasecmp ("Collect", child->key) == 0)
901 {
902 char buffer[1024];
903 status = cf_util_get_string_buffer (child, buffer, sizeof (buffer));
904 if (status == 0)
905 data_copy_by_name (&slave->collect, data_definitions, buffer);
906 status = 0; /* continue after failure. */
907 }
908 else
909 {
910 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
911 status = -1;
912 }
914 if (status != 0)
915 break;
916 }
918 if ((status == 0) && (slave->collect == NULL))
919 status = EINVAL;
921 if (slave->id < 0)
922 status = EINVAL;
924 if (status == 0)
925 host->slaves_num++;
926 else /* if (status != 0) */
927 data_free_all (slave->collect);
929 return (status);
930 } /* }}} int mb_config_add_slave */
932 static int mb_config_add_host (oconfig_item_t *ci) /* {{{ */
933 {
934 mb_host_t *host;
935 int status;
936 int i;
938 host = calloc (1, sizeof (*host));
939 if (host == NULL)
940 return (ENOMEM);
941 host->slaves = NULL;
943 status = cf_util_get_string_buffer (ci, host->host, sizeof (host->host));
944 if (status != 0)
945 {
946 sfree (host);
947 return (status);
948 }
949 if (host->host[0] == 0)
950 {
951 sfree (host);
952 return (EINVAL);
953 }
955 for (i = 0; i < ci->children_num; i++)
956 {
957 oconfig_item_t *child = ci->children + i;
958 status = 0;
960 if (strcasecmp ("Address", child->key) == 0)
961 {
962 char buffer[NI_MAXHOST];
963 status = cf_util_get_string_buffer (child, buffer, sizeof (buffer));
964 if (status == 0)
965 status = mb_config_set_host_address (host, buffer);
966 if (status == 0)
967 host->conntype = MBCONN_TCP;
968 }
969 else if (strcasecmp ("Port", child->key) == 0)
970 {
971 host->port = cf_util_get_port_number (child);
972 if (host->port <= 0)
973 status = -1;
974 }
975 else if (strcasecmp ("Device", child->key) == 0)
976 {
977 status = cf_util_get_string_buffer (child, host->node, sizeof (host->node));
978 if (status == 0)
979 host->conntype = MBCONN_RTU;
980 }
981 else if (strcasecmp ("Baudrate", child->key) == 0)
982 status = cf_util_get_int(child, &host->baudrate);
983 else if (strcasecmp ("Interval", child->key) == 0)
984 status = cf_util_get_cdtime (child, &host->interval);
985 else if (strcasecmp ("Slave", child->key) == 0)
986 /* Don't set status: Gracefully continue if a slave fails. */
987 mb_config_add_slave (host, child);
988 else
989 {
990 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
991 status = -1;
992 }
994 if (status != 0)
995 break;
996 } /* for (i = 0; i < ci->children_num; i++) */
998 assert (host->host[0] != 0);
999 if (host->node[0] == 0)
1000 {
1001 ERROR ("Modbus plugin: Data block \"%s\": No address or device has been specified.",
1002 host->host);
1003 status = -1;
1004 }
1005 if (host->conntype == MBCONN_RTU && !host->baudrate)
1006 {
1007 ERROR ("Modbus plugin: Data block \"%s\": No serial baudrate has been specified.",
1008 host->host);
1009 status = -1;
1010 }
1011 if ((host->conntype == MBCONN_TCP && host->baudrate) ||
1012 (host->conntype == MBCONN_RTU && host->port))
1013 {
1014 ERROR ("Modbus plugin: Data block \"%s\": You've mixed up RTU and TCP options.",
1015 host->host);
1016 status = -1;
1017 }
1019 if (status == 0)
1020 {
1021 user_data_t ud;
1022 char name[1024];
1024 ud.data = host;
1025 ud.free_func = host_free;
1027 ssnprintf (name, sizeof (name), "modbus-%s", host->host);
1029 plugin_register_complex_read (/* group = */ NULL, name,
1030 /* callback = */ mb_read,
1031 /* interval = */ host->interval,
1032 &ud);
1033 }
1034 else
1035 {
1036 host_free (host);
1037 }
1039 return (status);
1040 } /* }}} int mb_config_add_host */
1042 static int mb_config (oconfig_item_t *ci) /* {{{ */
1043 {
1044 int i;
1046 if (ci == NULL)
1047 return (EINVAL);
1049 for (i = 0; i < ci->children_num; i++)
1050 {
1051 oconfig_item_t *child = ci->children + i;
1053 if (strcasecmp ("Data", child->key) == 0)
1054 mb_config_add_data (child);
1055 else if (strcasecmp ("Host", child->key) == 0)
1056 mb_config_add_host (child);
1057 else
1058 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
1059 }
1061 return (0);
1062 } /* }}} int mb_config */
1064 /* ========= */
1066 static int mb_shutdown (void) /* {{{ */
1067 {
1068 data_free_all (data_definitions);
1069 data_definitions = NULL;
1071 return (0);
1072 } /* }}} int mb_shutdown */
1074 void module_register (void)
1075 {
1076 plugin_register_complex_config ("modbus", mb_config);
1077 plugin_register_shutdown ("modbus", mb_shutdown);
1078 } /* void module_register */
1080 /* vim: set sw=2 sts=2 et fdm=marker : */