2 * collectd - src/modbus.c
3 * Copyright (C) 2010,2011 noris network AG
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
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.
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
20 * Florian Forster <octo at noris.net>
26 #include "configfile.h"
30 #include <modbus/modbus.h>
32 #ifndef LIBMODBUS_VERSION_CHECK
33 /* Assume version 2.0.3 */
34 # define LEGACY_LIBMODBUS 1
36 /* Assume version 2.9.2 */
39 #ifndef MODBUS_TCP_DEFAULT_PORT
40 # ifdef MODBUS_TCP_PORT
41 # define MODBUS_TCP_DEFAULT_PORT MODBUS_TCP_PORT
43 # define MODBUS_TCP_DEFAULT_PORT 502
50 * RegisterCmd ReadHolding
60 * # Device "/dev/ttyUSB0"
66 * Instance "foobar" # optional
75 enum mb_register_type_e /* {{{ */
83 enum mb_mreg_type_e /* {{{ */
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 /* {{{ */
97 typedef enum mb_conntype_e mb_conntype_t;
100 typedef struct mb_data_s mb_data_t;
101 struct mb_data_s /* {{{ */
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];
113 struct mb_slave_s /* {{{ */
116 char instance[DATA_MAX_NAME_LEN];
119 typedef struct mb_slave_s mb_slave_t;
121 struct mb_host_s /* {{{ */
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;
135 modbus_param_t connection;
137 modbus_t *connection;
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 /* {{{ */
147 mb_data_t *registers;
148 size_t registers_num;
150 mb_data_group_t *next;
156 static mb_data_t *data_definitions = NULL;
161 static mb_data_t *data_get_by_name (mb_data_t *src, /* {{{ */
169 for (ptr = src; ptr != NULL; ptr = ptr->next)
170 if (strcasecmp (ptr->name, name) == 0)
174 } /* }}} mb_data_t *data_get_by_name */
176 static int data_append (mb_data_t **dst, mb_data_t *src) /* {{{ */
180 if ((dst == NULL) || (src == NULL))
191 while (ptr->next != NULL)
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) /* {{{ */
205 if ((dst == NULL) || (src == NULL))
208 tmp = malloc (sizeof (*tmp));
211 memcpy (tmp, src, sizeof (*tmp));
215 tmp->name = strdup (src->name);
216 if (tmp->name == NULL)
222 status = data_append (dst, tmp);
231 } /* }}} int data_copy */
233 /* Lookup a single mb_data_t instance, copy it and append the copy to another
235 static int data_copy_by_name (mb_data_t **dst, mb_data_t *src, /* {{{ */
240 if ((dst == NULL) || (src == NULL) || (name == NULL))
243 ptr = data_get_by_name (src, name);
247 return (data_copy (dst, ptr));
248 } /* }}} int data_copy_by_name */
252 static int mb_submit (mb_host_t *host, mb_slave_t *slave, /* {{{ */
253 mb_data_t *data, value_t value)
255 value_list_t vl = VALUE_LIST_INIT;
257 if ((host == NULL) || (slave == NULL) || (data == NULL))
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",
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) /* {{{ */
288 #if BYTE_ORDER == 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;
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;
302 } /* }}} float mb_register_to_float */
306 static int mb_init_connection (mb_host_t *host) /* {{{ */
313 modbus_set_debug (&host->connection, 1);
315 /* We'll do the error handling ourselves. */
316 modbus_set_error_handling (&host->connection, NOP_ON_ERROR);
318 if (host->conntype == MBCONN_TCP)
320 if ((host->port < 1) || (host->port > 65535))
321 host->port = MODBUS_TCP_DEFAULT_PORT;
323 DEBUG ("Modbus plugin: Trying to connect to \"%s\", port %i.",
324 host->node, host->port);
326 modbus_init_tcp (&host->connection,
327 /* host = */ host->node,
328 /* port = */ host->port);
330 else /* MBCONN_RTU */
332 DEBUG ("Modbus plugin: Trying to connect to \"%s\".", host->node);
334 modbus_init_rtu (&host->connection,
335 /* device = */ host->node,
336 /* baudrate = */ host->baudrate,
340 status = modbus_connect (&host->connection);
343 ERROR ("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
344 host->node, host->port ? host->port : host->baudrate, status);
348 host->is_connected = 1;
350 } /* }}} int mb_init_connection */
351 /* #endif LEGACY_LIBMODBUS */
353 #else /* if !LEGACY_LIBMODBUS */
355 static int mb_init_connection (mb_host_t *host) /* {{{ */
362 if (host->connection != NULL)
365 if (host->conntype == MBCONN_TCP)
367 if ((host->port < 1) || (host->port > 65535))
368 host->port = MODBUS_TCP_DEFAULT_PORT;
370 DEBUG ("Modbus plugin: Trying to connect to \"%s\", port %i.",
371 host->node, host->port);
373 host->connection = modbus_new_tcp (host->node, host->port);
374 if (host->connection == NULL)
376 ERROR ("Modbus plugin: Creating new Modbus/TCP object failed.");
382 DEBUG ("Modbus plugin: Trying to connect to \"%s\", baudrate %i.",
383 host->node, host->baudrate);
385 host->connection = modbus_new_rtu (host->node, host->baudrate, 'N', 8, 1);
386 if (host->connection == NULL)
388 ERROR ("Modbus plugin: Creating new Modbus/RTU object failed.");
393 modbus_set_debug (host->connection, 1);
395 /* We'll do the error handling ourselves. */
396 modbus_set_error_recovery (host->connection, 0);
398 status = modbus_connect (host->connection);
401 ERROR ("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
402 host->node, host->port ? host->port : host->baudrate, status);
403 modbus_free (host->connection);
404 host->connection = NULL;
409 } /* }}} int mb_init_connection */
410 #endif /* !LEGACY_LIBMODBUS */
412 #define CAST_TO_VALUE_T(ds,vt,raw) do { \
413 if ((ds)->ds[0].type == DS_TYPE_COUNTER) \
414 (vt).counter = (counter_t) (raw); \
415 else if ((ds)->ds[0].type == DS_TYPE_GAUGE) \
416 (vt).gauge = (gauge_t) (raw); \
417 else if ((ds)->ds[0].type == DS_TYPE_DERIVE) \
418 (vt).derive = (derive_t) (raw); \
419 else /* if (ds->ds[0].type == DS_TYPE_ABSOLUTE) */ \
420 (vt).absolute = (absolute_t) (raw); \
423 static int mb_read_data (mb_host_t *host, mb_slave_t *slave, /* {{{ */
428 const data_set_t *ds;
431 if ((host == NULL) || (slave == NULL) || (data == NULL))
434 ds = plugin_get_ds (data->type);
437 ERROR ("Modbus plugin: Type \"%s\" is not defined.", data->type);
443 ERROR ("Modbus plugin: The type \"%s\" has %i data sources. "
444 "I can only handle data sets with only one data source.",
445 data->type, ds->ds_num);
449 if ((ds->ds[0].type != DS_TYPE_GAUGE)
450 && (data->register_type != REG_TYPE_INT32)
451 && (data->register_type != REG_TYPE_UINT32))
453 NOTICE ("Modbus plugin: The data source of type \"%s\" is %s, not gauge. "
454 "This will most likely result in problems, because the register type "
455 "is not UINT32.", data->type, DS_TYPE_TO_STRING (ds->ds[0].type));
458 memset (values, 0, sizeof (values));
459 if ((data->register_type == REG_TYPE_INT32)
460 || (data->register_type == REG_TYPE_UINT32)
461 || (data->register_type == REG_TYPE_FLOAT))
467 if (host->connection == NULL)
471 else if (host->conntype == MBCONN_TCP)
473 struct sockaddr sockaddr;
474 socklen_t saddrlen = sizeof (sockaddr);
476 status = getpeername (modbus_get_socket (host->connection),
477 &sockaddr, &saddrlen);
482 if ((status == EBADF) || (status == ENOTSOCK) || (status == ENOTCONN))
484 status = mb_init_connection (host);
487 ERROR ("Modbus plugin: mb_init_connection (%s/%s) failed. ",
488 host->host, host->node);
489 host->is_connected = 0;
490 host->connection = NULL;
494 else if (status != 0)
497 modbus_close (&host->connection);
499 modbus_close (host->connection);
500 modbus_free (host->connection);
505 /* Version 2.0.3: Pass the connection struct as a pointer and pass the slave
506 * id to each call of "read_holding_registers". */
507 # define modbus_read_registers(ctx, addr, nb, dest) \
508 read_holding_registers (&(ctx), slave->id, (addr), (nb), (dest))
509 #else /* if !LEGACY_LIBMODBUS */
510 /* Version 2.9.2: Set the slave id once before querying the registers. */
511 status = modbus_set_slave (host->connection, slave->id);
514 ERROR ("Modbus plugin: modbus_set_slave (%i) failed with status %i.",
519 if (data->modbus_register_type == MREG_INPUT){
520 status = modbus_read_input_registers (host->connection,
521 /* start_addr = */ data->register_base,
522 /* num_registers = */ values_num, /* buffer = */ values);
525 status = modbus_read_registers (host->connection,
526 /* start_addr = */ data->register_base,
527 /* num_registers = */ values_num, /* buffer = */ values);
529 if (status != values_num)
531 ERROR ("Modbus plugin: modbus read function (%s/%s) failed. "
532 " status = %i, values_num = %i. Giving up.",
533 host->host, host->node, status, values_num);
535 modbus_close (&host->connection);
537 modbus_close (host->connection);
538 modbus_free (host->connection);
540 host->connection = NULL;
544 DEBUG ("Modbus plugin: mb_read_data: Success! "
545 "modbus_read_registers returned with status %i.", status);
547 if (data->register_type == REG_TYPE_FLOAT)
552 float_value = mb_register_to_float (values[0], values[1]);
553 DEBUG ("Modbus plugin: mb_read_data: "
554 "Returned float value is %g", (double) float_value);
556 CAST_TO_VALUE_T (ds, vt, float_value);
557 mb_submit (host, slave, data, vt);
559 else if (data->register_type == REG_TYPE_INT32)
568 v.u32 = (((uint32_t) values[0]) << 16)
569 | ((uint32_t) values[1]);
570 DEBUG ("Modbus plugin: mb_read_data: "
571 "Returned int32 value is %"PRIi32, v.i32);
573 CAST_TO_VALUE_T (ds, vt, v.i32);
574 mb_submit (host, slave, data, vt);
576 else if (data->register_type == REG_TYPE_INT16)
587 DEBUG ("Modbus plugin: mb_read_data: "
588 "Returned int16 value is %"PRIi16, v.i16);
590 CAST_TO_VALUE_T (ds, vt, v.i16);
591 mb_submit (host, slave, data, vt);
593 else if (data->register_type == REG_TYPE_UINT32)
598 v32 = (((uint32_t) values[0]) << 16)
599 | ((uint32_t) values[1]);
600 DEBUG ("Modbus plugin: mb_read_data: "
601 "Returned uint32 value is %"PRIu32, v32);
603 CAST_TO_VALUE_T (ds, vt, v32);
604 mb_submit (host, slave, data, vt);
606 else /* if (data->register_type == REG_TYPE_UINT16) */
610 DEBUG ("Modbus plugin: mb_read_data: "
611 "Returned uint16 value is %"PRIu16, values[0]);
613 CAST_TO_VALUE_T (ds, vt, values[0]);
614 mb_submit (host, slave, data, vt);
618 } /* }}} int mb_read_data */
620 static int mb_read_slave (mb_host_t *host, mb_slave_t *slave) /* {{{ */
626 if ((host == NULL) || (slave == NULL))
630 for (data = slave->collect; data != NULL; data = data->next)
632 status = mb_read_data (host, slave, data);
641 } /* }}} int mb_read_slave */
643 static int mb_read (user_data_t *user_data) /* {{{ */
650 if ((user_data == NULL) || (user_data->data == NULL))
653 host = user_data->data;
656 for (i = 0; i < host->slaves_num; i++)
658 status = mb_read_slave (host, host->slaves + i);
667 } /* }}} int mb_read */
671 static void data_free_one (mb_data_t *data) /* {{{ */
678 } /* }}} void data_free_one */
680 static void data_free_all (mb_data_t *data) /* {{{ */
688 data_free_one (data);
690 data_free_all (next);
691 } /* }}} void data_free_all */
693 static void slaves_free_all (mb_slave_t *slaves, size_t slaves_num) /* {{{ */
700 for (i = 0; i < slaves_num; i++)
701 data_free_all (slaves[i].collect);
703 } /* }}} void slaves_free_all */
705 static void host_free (void *void_host) /* {{{ */
707 mb_host_t *host = void_host;
712 slaves_free_all (host->slaves, host->slaves_num);
714 } /* }}} void host_free */
716 /* Config functions */
718 static int mb_config_add_data (oconfig_item_t *ci) /* {{{ */
724 memset (&data, 0, sizeof (data));
726 data.register_type = REG_TYPE_UINT16;
729 status = cf_util_get_string (ci, &data.name);
733 for (i = 0; i < ci->children_num; i++)
735 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)
749 status = cf_util_get_string_buffer (child, tmp, sizeof (tmp));
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;
764 ERROR ("Modbus plugin: The register type \"%s\" is unknown.", tmp);
768 else if (strcasecmp ("RegisterCmd", child->key) == 0)
771 ERROR("Modbus plugin: RegisterCmd parameter can not be used "
772 "with your libmodbus version");
775 status = cf_util_get_string_buffer (child, tmp, sizeof (tmp));
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;
784 ERROR ("Modbus plugin: The modbus_register_type \"%s\" is unknown.",
792 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
798 } /* for (i = 0; i < ci->children_num; i++) */
800 assert (data.name != NULL);
801 if (data.type[0] == 0)
803 ERROR ("Modbus plugin: Data block \"%s\": No type has been specified.",
809 data_copy (&data_definitions, &data);
814 } /* }}} int mb_config_add_data */
816 static int mb_config_set_host_address (mb_host_t *host, /* {{{ */
819 struct addrinfo *ai_list;
820 struct addrinfo *ai_ptr;
821 struct addrinfo ai_hints;
824 if ((host == NULL) || (address == NULL))
827 memset (&ai_hints, 0, sizeof (ai_hints));
829 ai_hints.ai_flags |= AI_ADDRCONFIG;
831 /* XXX: libmodbus can only handle IPv4 addresses. */
832 ai_hints.ai_family = AF_INET;
833 ai_hints.ai_addr = NULL;
834 ai_hints.ai_canonname = NULL;
835 ai_hints.ai_next = NULL;
838 status = getaddrinfo (address, /* service = */ NULL,
839 &ai_hints, &ai_list);
843 ERROR ("Modbus plugin: getaddrinfo failed: %s",
844 (status == EAI_SYSTEM)
845 ? sstrerror (errno, errbuf, sizeof (errbuf))
846 : gai_strerror (status));
850 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
852 status = getnameinfo (ai_ptr->ai_addr, ai_ptr->ai_addrlen,
853 host->node, sizeof (host->node),
854 /* service = */ NULL, /* length = */ 0,
855 /* flags = */ NI_NUMERICHOST);
860 freeaddrinfo (ai_list);
863 ERROR ("Modbus plugin: Unable to translate node name: \"%s\"", address);
864 else /* if (status == 0) */
866 DEBUG ("Modbus plugin: mb_config_set_host_address: %s -> %s",
867 address, host->node);
871 } /* }}} int mb_config_set_host_address */
873 static int mb_config_add_slave (mb_host_t *host, oconfig_item_t *ci) /* {{{ */
879 if ((host == NULL) || (ci == NULL))
882 slave = realloc (host->slaves, sizeof (*slave) * (host->slaves_num + 1));
885 host->slaves = slave;
886 slave = host->slaves + host->slaves_num;
887 memset (slave, 0, sizeof (*slave));
888 slave->collect = NULL;
890 status = cf_util_get_int (ci, &slave->id);
894 for (i = 0; i < ci->children_num; i++)
896 oconfig_item_t *child = ci->children + i;
899 if (strcasecmp ("Instance", child->key) == 0)
900 status = cf_util_get_string_buffer (child,
901 slave->instance, sizeof (slave->instance));
902 else if (strcasecmp ("Collect", child->key) == 0)
905 status = cf_util_get_string_buffer (child, buffer, sizeof (buffer));
907 data_copy_by_name (&slave->collect, data_definitions, buffer);
908 status = 0; /* continue after failure. */
912 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
920 if ((status == 0) && (slave->collect == NULL))
928 else /* if (status != 0) */
929 data_free_all (slave->collect);
932 } /* }}} int mb_config_add_slave */
934 static int mb_config_add_host (oconfig_item_t *ci) /* {{{ */
940 host = malloc (sizeof (*host));
943 memset (host, 0, sizeof (*host));
946 status = cf_util_get_string_buffer (ci, host->host, sizeof (host->host));
949 if (host->host[0] == 0)
952 for (i = 0; i < ci->children_num; i++)
954 oconfig_item_t *child = ci->children + i;
957 if (strcasecmp ("Address", child->key) == 0)
959 char buffer[NI_MAXHOST];
960 status = cf_util_get_string_buffer (child, buffer, sizeof (buffer));
962 status = mb_config_set_host_address (host, buffer);
964 host->conntype = MBCONN_TCP;
966 else if (strcasecmp ("Port", child->key) == 0)
968 host->port = cf_util_get_port_number (child);
972 else if (strcasecmp ("Device", child->key) == 0)
974 status = cf_util_get_string_buffer (child, host->node, sizeof (host->node));
976 host->conntype = MBCONN_RTU;
978 else if (strcasecmp ("Baudrate", child->key) == 0)
979 status = cf_util_get_int(child, &host->baudrate);
980 else if (strcasecmp ("Interval", child->key) == 0)
981 status = cf_util_get_cdtime (child, &host->interval);
982 else if (strcasecmp ("Slave", child->key) == 0)
983 /* Don't set status: Gracefully continue if a slave fails. */
984 mb_config_add_slave (host, child);
987 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
993 } /* for (i = 0; i < ci->children_num; i++) */
995 assert (host->host[0] != 0);
996 if (host->node[0] == 0)
998 ERROR ("Modbus plugin: Data block \"%s\": No address or device has been specified.",
1002 if (host->conntype == MBCONN_RTU && !host->baudrate)
1004 ERROR ("Modbus plugin: Data block \"%s\": No serial baudrate has been specified.",
1008 if ((host->conntype == MBCONN_TCP && host->baudrate) ||
1009 (host->conntype == MBCONN_RTU && host->port))
1011 ERROR ("Modbus plugin: Data block \"%s\": You've mixed up RTU and TCP options.",
1022 ud.free_func = host_free;
1024 ssnprintf (name, sizeof (name), "modbus-%s", host->host);
1026 plugin_register_complex_read (/* group = */ NULL, name,
1027 /* callback = */ mb_read,
1028 /* interval = */ host->interval,
1037 } /* }}} int mb_config_add_host */
1039 static int mb_config (oconfig_item_t *ci) /* {{{ */
1046 for (i = 0; i < ci->children_num; i++)
1048 oconfig_item_t *child = ci->children + i;
1050 if (strcasecmp ("Data", child->key) == 0)
1051 mb_config_add_data (child);
1052 else if (strcasecmp ("Host", child->key) == 0)
1053 mb_config_add_host (child);
1055 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
1059 } /* }}} int mb_config */
1063 static int mb_shutdown (void) /* {{{ */
1065 data_free_all (data_definitions);
1066 data_definitions = NULL;
1069 } /* }}} int mb_shutdown */
1071 void module_register (void)
1073 plugin_register_complex_config ("modbus", mb_config);
1074 plugin_register_shutdown ("modbus", mb_shutdown);
1075 } /* void module_register */
1077 /* vim: set sw=2 sts=2 et fdm=marker : */