2 * collectd - src/modbus.c
3 * Copyright (C) 2010 noris network AG
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Florian Forster <octo at noris.net>
25 #include "configfile.h"
27 #include <modbus/modbus.h>
43 * Instance "foobar" # optional
52 enum mb_register_type_e
58 typedef enum mb_register_type_e mb_register_type_t;
61 typedef struct mb_data_s mb_data_t;
66 mb_register_type_t register_type;
67 char type[DATA_MAX_NAME_LEN];
68 char instance[DATA_MAX_NAME_LEN];
76 char instance[DATA_MAX_NAME_LEN];
79 typedef struct mb_slave_s mb_slave_t;
83 char host[DATA_MAX_NAME_LEN];
84 char node[NI_MAXHOST];
85 /* char service[NI_MAXSERV]; */
92 modbus_param_t connection;
94 _Bool have_reconnected;
96 typedef struct mb_host_s mb_host_t;
98 struct mb_data_group_s;
99 typedef struct mb_data_group_s mb_data_group_t;
100 struct mb_data_group_s
102 mb_data_t *registers;
103 size_t registers_num;
105 mb_data_group_t *next;
111 static mb_data_t *data_definitions = NULL;
116 static mb_data_t *data_get_by_name (mb_data_t *src, /* {{{ */
124 for (ptr = src; ptr != NULL; ptr = ptr->next)
125 if (strcasecmp (ptr->name, name) == 0)
129 } /* }}} mb_data_t *data_get_by_name */
131 static int data_append (mb_data_t **dst, mb_data_t *src) /* {{{ */
135 if ((dst == NULL) || (src == NULL))
146 while (ptr->next != NULL)
152 } /* }}} int data_append */
154 /* Copy a single mb_data_t and append it to another list. */
155 static int data_copy (mb_data_t **dst, const mb_data_t *src) /* {{{ */
160 if ((dst == NULL) || (src == NULL))
163 tmp = malloc (sizeof (*tmp));
166 memcpy (tmp, src, sizeof (*tmp));
170 tmp->name = strdup (src->name);
171 if (tmp->name == NULL)
177 status = data_append (dst, tmp);
186 } /* }}} int data_copy */
188 /* Lookup a single mb_data_t instance, copy it and append the copy to another
190 static int data_copy_by_name (mb_data_t **dst, mb_data_t *src, /* {{{ */
195 if ((dst == NULL) || (src == NULL) || (name == NULL))
198 ptr = data_get_by_name (src, name);
202 return (data_copy (dst, ptr));
203 } /* }}} int data_copy_by_name */
207 static float mb_register_to_float (uint16_t hi, uint16_t lo) /* {{{ */
215 #if BYTE_ORDER == LITTLE_ENDIAN
217 conv.b[0] = lo & 0x00ff;
218 conv.b[1] = (lo >> 8) & 0x00ff;
219 conv.b[2] = hi & 0x00ff;
220 conv.b[3] = (hi >> 8) & 0x00ff;
222 conv.b[3] = lo & 0x00ff;
223 conv.b[2] = (lo >> 8) & 0x00ff;
224 conv.b[1] = hi & 0x00ff;
225 conv.b[0] = (hi >> 8) & 0x00ff;
229 } /* }}} float mb_register_to_float */
231 static int mb_init_connection (mb_host_t *host) /* {{{ */
238 if (host->is_connected)
241 /* Only reconnect once per interval. */
242 if (host->have_reconnected)
245 modbus_set_debug (&host->connection, 1);
247 /* We'll do the error handling ourselves. */
248 modbus_set_error_handling (&host->connection, NOP_ON_ERROR);
250 if ((host->port < 1) || (host->port > 65535))
251 host->port = MODBUS_TCP_DEFAULT_PORT;
253 DEBUG ("Modbus plugin: Trying to connect to \"%s\", port %i.",
254 host->node, host->port);
256 modbus_init_tcp (&host->connection,
257 /* host = */ host->node,
258 /* port = */ host->port);
260 status = modbus_connect (&host->connection);
263 ERROR ("Modbus plugin: modbus_connect (%s, %i) failed with status %i.",
264 host->node, host->port, status);
268 host->is_connected = 1;
269 host->have_reconnected = 1;
271 } /* }}} int mb_init_connection */
273 static int mb_read_data (mb_host_t *host, mb_slave_t *slave, /* {{{ */
278 const data_set_t *ds;
282 if ((host == NULL) || (slave == NULL) || (data == NULL))
285 ds = plugin_get_ds (data->type);
288 ERROR ("Modbus plugin: Type \"%s\" is not defined.", data->type);
294 ERROR ("Modbus plugin: The type \"%s\" has %i data sources. "
295 "I can only handle data sets with only one data source.",
296 data->type, ds->ds_num);
300 memset (values, 0, sizeof (values));
301 if ((data->register_type == REG_TYPE_UINT32)
302 || (data->register_type == REG_TYPE_FLOAT))
307 for (i = 0; i < 2; i++)
309 status = read_holding_registers (&host->connection,
310 /* slave = */ slave->id, /* start_addr = */ data->register_base,
311 /* num_registers = */ values_num, /* buffer = */ values);
315 if (host->is_connected)
316 modbus_close (&host->connection);
317 host->is_connected = 0;
319 /* If we already tried reconnecting this round, give up. */
320 if (host->have_reconnected)
322 ERROR ("Modbus plugin: read_holding_registers (%s) failed. "
323 "Reconnecting has already been tried. Giving up.", host->host);
327 /* Maybe the device closed the connection during the waiting interval.
328 * Try re-establishing the connection. */
329 status = mb_init_connection (host);
332 ERROR ("Modbus plugin: read_holding_registers (%s) failed. "
333 "While trying to reconnect, connecting to \"%s\" failed. "
335 host->host, host->node);
339 DEBUG ("Modbus plugin: Re-established connection to %s", host->host);
343 } /* for (i = 0, 1) */
345 DEBUG ("Modbus plugin: mb_read_data: Success! "
346 "read_holding_registers returned with status %i.", status);
348 if (data->register_type == REG_TYPE_FLOAT)
352 value = mb_register_to_float (values[0], values[1]);
353 DEBUG ("Modbus plugin: mb_read_data: "
354 "Returned float value is %g", (double) value);
358 } /* }}} int mb_read_data */
360 static int mb_read_slave (mb_host_t *host, mb_slave_t *slave) /* {{{ */
366 if ((host == NULL) || (slave == NULL))
370 for (data = slave->collect; data != NULL; data = data->next)
372 status = mb_read_data (host, slave, data);
381 } /* }}} int mb_read_slave */
383 static int mb_read (user_data_t *user_data) /* {{{ */
390 if ((user_data == NULL) || (user_data->data == NULL))
393 host = user_data->data;
395 /* Clear the reconnect flag. */
396 host->have_reconnected = 0;
399 for (i = 0; i < host->slaves_num; i++)
401 status = mb_read_slave (host, host->slaves + i);
410 } /* }}} int mb_read */
414 static void data_free_one (mb_data_t *data) /* {{{ */
421 } /* }}} void data_free_one */
423 static void data_free_all (mb_data_t *data) /* {{{ */
431 data_free_one (data);
433 data_free_all (next);
434 } /* }}} void data_free_all */
436 static void slaves_free_all (mb_slave_t *slaves, size_t slaves_num) /* {{{ */
443 for (i = 0; i < slaves_num; i++)
444 data_free_all (slaves[i].collect);
446 } /* }}} void slaves_free_all */
448 static void host_free (void *void_host) /* {{{ */
450 mb_host_t *host = void_host;
455 slaves_free_all (host->slaves, host->slaves_num);
457 } /* }}} void host_free */
459 /* Config functions */
461 static int mb_config_add_data (oconfig_item_t *ci) /* {{{ */
467 memset (&data, 0, sizeof (data));
469 data.register_type = REG_TYPE_UINT16;
472 status = cf_util_get_string (ci, &data.name);
476 for (i = 0; i < ci->children_num; i++)
478 oconfig_item_t *child = ci->children + i;
481 if (strcasecmp ("Type", child->key) == 0)
482 status = cf_util_get_string_buffer (child,
483 data.type, sizeof (data.type));
484 else if (strcasecmp ("Instance", child->key) == 0)
485 status = cf_util_get_string_buffer (child,
486 data.instance, sizeof (data.instance));
487 else if (strcasecmp ("RegisterBase", child->key) == 0)
488 status = cf_util_get_int (child, &data.register_base);
489 else if (strcasecmp ("RegisterType", child->key) == 0)
492 status = cf_util_get_string_buffer (child, tmp, sizeof (tmp));
495 else if (strcasecmp ("Uint16", tmp) == 0)
496 data.register_type = REG_TYPE_UINT16;
497 else if (strcasecmp ("Uint32", tmp) == 0)
498 data.register_type = REG_TYPE_UINT32;
499 else if (strcasecmp ("Float", tmp) == 0)
500 data.register_type = REG_TYPE_FLOAT;
503 ERROR ("Modbus plugin: The register type \"%s\" is unknown.", tmp);
509 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
515 } /* for (i = 0; i < ci->children_num; i++) */
517 assert (data.name != NULL);
518 if (data.type[0] == 0)
520 ERROR ("Modbus plugin: Data block \"%s\": No type has been specified.",
526 data_copy (&data_definitions, &data);
531 } /* }}} int mb_config_add_data */
533 static int mb_config_set_host_address (mb_host_t *host, /* {{{ */
536 struct addrinfo *ai_list;
537 struct addrinfo *ai_ptr;
538 struct addrinfo ai_hints;
541 if ((host == NULL) || (address == NULL))
544 memset (&ai_hints, 0, sizeof (ai_hints));
546 ai_hints.ai_flags |= AI_ADDRCONFIG;
548 /* XXX: libmodbus can only handle IPv4 addresses. */
549 ai_hints.ai_family = AF_INET;
550 ai_hints.ai_addr = NULL;
551 ai_hints.ai_canonname = NULL;
552 ai_hints.ai_next = NULL;
555 status = getaddrinfo (address, /* service = */ NULL,
556 &ai_hints, &ai_list);
560 ERROR ("Modbus plugin: getaddrinfo failed: %s",
561 (status == EAI_SYSTEM)
562 ? sstrerror (errno, errbuf, sizeof (errbuf))
563 : gai_strerror (status));
567 for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
569 status = getnameinfo (ai_ptr->ai_addr, ai_ptr->ai_addrlen,
570 host->node, sizeof (host->node),
571 /* service = */ NULL, /* length = */ 0,
572 /* flags = */ NI_NUMERICHOST);
577 freeaddrinfo (ai_list);
580 ERROR ("Modbus plugin: Unable to translate node name: \"%s\"", address);
581 else /* if (status == 0) */
583 DEBUG ("Modbus plugin: mb_config_set_host_address: %s -> %s",
584 address, host->node);
588 } /* }}} int mb_config_set_host_address */
590 static int mb_config_add_slave (mb_host_t *host, oconfig_item_t *ci) /* {{{ */
596 if ((host == NULL) || (ci == NULL))
599 slave = realloc (host->slaves, sizeof (*slave) * (host->slaves_num + 1));
602 host->slaves = slave;
603 slave = host->slaves + host->slaves_num;
604 memset (slave, 0, sizeof (*slave));
605 slave->collect = NULL;
607 status = cf_util_get_int (ci, &slave->id);
611 for (i = 0; i < ci->children_num; i++)
613 oconfig_item_t *child = ci->children + i;
616 if (strcasecmp ("Instance", child->key) == 0)
617 status = cf_util_get_string_buffer (child,
618 slave->instance, sizeof (slave->instance));
619 else if (strcasecmp ("Collect", child->key) == 0)
622 status = cf_util_get_string_buffer (child, buffer, sizeof (buffer));
624 data_copy_by_name (&slave->collect, data_definitions, buffer);
625 status = 0; /* continue after failure. */
629 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
637 if ((status == 0) && (slave->collect == NULL))
645 else /* if (status != 0) */
646 data_free_all (slave->collect);
649 } /* }}} int mb_config_add_slave */
651 static int mb_config_add_host (oconfig_item_t *ci) /* {{{ */
657 host = malloc (sizeof (*host));
660 memset (host, 0, sizeof (*host));
663 status = cf_util_get_string_buffer (ci, host->host, sizeof (host->host));
666 if (host->host[0] == 0)
669 for (i = 0; i < ci->children_num; i++)
671 oconfig_item_t *child = ci->children + i;
674 if (strcasecmp ("Address", child->key) == 0)
676 char buffer[NI_MAXHOST];
677 status = cf_util_get_string_buffer (child, buffer, sizeof (buffer));
679 status = mb_config_set_host_address (host, buffer);
681 else if (strcasecmp ("Port", child->key) == 0)
683 host->port = cf_util_get_port_number (child);
687 else if (strcasecmp ("Interval", child->key) == 0)
688 status = cf_util_get_int (child, &host->interval);
689 else if (strcasecmp ("Slave", child->key) == 0)
690 /* Don't set status: Gracefully continue if a slave fails. */
691 mb_config_add_slave (host, child);
694 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
700 } /* for (i = 0; i < ci->children_num; i++) */
702 assert (host->host[0] != 0);
703 if (host->host[0] == 0)
705 ERROR ("Modbus plugin: Data block \"%s\": No type has been specified.",
714 struct timespec interval;
717 ud.free_func = host_free;
719 ssnprintf (name, sizeof (name), "modbus-%s", host->host);
721 interval.tv_nsec = 0;
722 if (host->interval > 0)
723 interval.tv_sec = host->interval;
727 plugin_register_complex_read (name, mb_read,
728 (interval.tv_sec > 0) ? &interval : NULL,
737 } /* }}} int mb_config_add_host */
739 static int mb_config (oconfig_item_t *ci) /* {{{ */
746 for (i = 0; i < ci->children_num; i++)
748 oconfig_item_t *child = ci->children + i;
750 if (strcasecmp ("Data", child->key) == 0)
751 mb_config_add_data (child);
752 else if (strcasecmp ("Host", child->key) == 0)
753 mb_config_add_host (child);
755 ERROR ("Modbus plugin: Unknown configuration option: %s", child->key);
759 } /* }}} int mb_config */
764 static int foo (void) /* {{{ */
773 printf ("mb_read (addr = %i, float = %s);\n", register_addr,
774 is_float ? "true" : "false");
776 memset (values, 0, sizeof (values));
782 status = read_holding_registers (dev->connection,
783 /* slave = */ 1, /* start_addr = */ register_addr,
784 /* num_registers = */ values_num, /* buffer = */ values);
785 printf ("read_coil_status returned with status %i\n", status);
791 float value = mb_register_to_float (values[0], values[1]);
792 printf ("read_coil_status returned value %g (hi %#"PRIx16", lo %#"PRIx16")\n",
793 value, values[0], values[1]);
797 printf ("read_coil_status returned value %"PRIu16"\n", values[0]);
804 static int mb_shutdown (void) /* {{{ */
806 data_free_all (data_definitions);
807 data_definitions = NULL;
810 } /* }}} int mb_shutdown */
812 void module_register (void)
814 plugin_register_complex_config ("modbus", mb_config);
815 plugin_register_shutdown ("modbus", mb_shutdown);
816 } /* void module_register */
818 /* vim: set sw=2 sts=2 et fdm=marker : */