2 * collectd - src/snmp.c
3 * Copyright (C) 2007 Florian octo Forster
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 octo Forster <octo at verplant.org>
28 #include <net-snmp/net-snmp-config.h>
29 #include <net-snmp/net-snmp-includes.h>
32 * Private data structes
39 typedef struct oid_s oid_t;
43 char string[DATA_MAX_NAME_LEN];
46 typedef union instance_u instance_t;
48 struct data_definition_s
50 char *name; /* used to reference this from the `Collect' option */
51 char *type; /* used to find the data_set */
56 struct data_definition_s *next;
58 typedef struct data_definition_s data_definition_t;
60 struct host_definition_s
69 data_definition_t **data_list;
71 enum /****************************************************/
73 STATE_IDLE, /* - just sits there until `skip_left < interval_g' */
74 STATE_WAIT, /* - waits to be queried. */
75 STATE_BUSY /* - is currently being queried. */
76 } state; /****************************************************/
77 struct host_definition_s *next;
79 typedef struct host_definition_s host_definition_t;
81 /* These two types are used to cache values in `csnmp_read_table' to handle
83 struct csnmp_list_instances_s
86 char instance[DATA_MAX_NAME_LEN];
87 struct csnmp_list_instances_s *next;
89 typedef struct csnmp_list_instances_s csnmp_list_instances_t;
91 struct csnmp_table_values_s
95 struct csnmp_table_values_s *next;
97 typedef struct csnmp_table_values_s csnmp_table_values_t;
102 static int do_shutdown = 0;
104 pthread_t *threads = NULL;
107 static data_definition_t *data_head = NULL;
108 static host_definition_t *host_head = NULL;
110 static pthread_mutex_t host_lock = PTHREAD_MUTEX_INITIALIZER;
111 static pthread_cond_t host_cond = PTHREAD_COND_INITIALIZER;
116 /* First there are many functions which do configuration stuff. It's a big
117 * bloated and messy, I'm afraid. */
120 * Callgraph for the config stuff:
122 * +-> call_snmp_init_once
123 * +-> csnmp_config_add_data
124 * ! +-> csnmp_config_add_data_type
125 * ! +-> csnmp_config_add_data_table
126 * ! +-> csnmp_config_add_data_instance
127 * ! +-> csnmp_config_add_data_values
128 * +-> csnmp_config_add_host
129 * +-> csnmp_config_add_host_address
130 * +-> csnmp_config_add_host_community
131 * +-> csnmp_config_add_host_version
132 * +-> csnmp_config_add_host_collect
133 * +-> csnmp_config_add_host_interval
135 static void call_snmp_init_once (void)
137 static int have_init = 0;
140 init_snmp (PACKAGE_NAME);
142 } /* void call_snmp_init_once */
144 static int csnmp_config_add_data_type (data_definition_t *dd, oconfig_item_t *ci)
146 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
148 WARNING ("snmp plugin: `Type' needs exactly one string argument.");
152 if (dd->type != NULL)
155 dd->type = strdup (ci->values[0].value.string);
156 if (dd->type == NULL)
160 } /* int csnmp_config_add_data_type */
162 static int csnmp_config_add_data_table (data_definition_t *dd, oconfig_item_t *ci)
164 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_BOOLEAN))
166 WARNING ("snmp plugin: `Table' needs exactly one boolean argument.");
170 dd->is_table = ci->values[0].value.boolean ? 1 : 0;
173 } /* int csnmp_config_add_data_table */
175 static int csnmp_config_add_data_instance (data_definition_t *dd, oconfig_item_t *ci)
177 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
179 WARNING ("snmp plugin: `Instance' needs exactly one string argument.");
185 /* Instance is an OID */
186 dd->instance.oid.oid_len = MAX_OID_LEN;
188 if (!read_objid (ci->values[0].value.string,
189 dd->instance.oid.oid, &dd->instance.oid.oid_len))
191 ERROR ("snmp plugin: read_objid (%s) failed.",
192 ci->values[0].value.string);
198 /* Instance is a simple string */
199 strncpy (dd->instance.string, ci->values[0].value.string, DATA_MAX_NAME_LEN - 1);
203 } /* int csnmp_config_add_data_instance */
205 static int csnmp_config_add_data_values (data_definition_t *dd, oconfig_item_t *ci)
209 if (ci->values_num < 1)
211 WARNING ("snmp plugin: `Values' needs at least one argument.");
215 for (i = 0; i < ci->values_num; i++)
216 if (ci->values[i].type != OCONFIG_TYPE_STRING)
218 WARNING ("snmp plugin: `Values' needs only string argument.");
222 if (dd->values != NULL)
224 dd->values = (oid_t *) malloc (sizeof (oid_t) * ci->values_num);
225 if (dd->values == NULL)
227 dd->values_len = ci->values_num;
229 for (i = 0; i < ci->values_num; i++)
231 dd->values[i].oid_len = MAX_OID_LEN;
233 if (NULL == snmp_parse_oid (ci->values[i].value.string,
234 dd->values[i].oid, &dd->values[i].oid_len))
236 ERROR ("snmp plugin: snmp_parse_oid (%s) failed.",
237 ci->values[i].value.string);
246 } /* int csnmp_config_add_data_instance */
248 static int csnmp_config_add_data (oconfig_item_t *ci)
250 data_definition_t *dd;
254 if ((ci->values_num != 1)
255 || (ci->values[0].type != OCONFIG_TYPE_STRING))
257 WARNING ("snmp plugin: The `Data' config option needs exactly one string argument.");
261 dd = (data_definition_t *) malloc (sizeof (data_definition_t));
264 memset (dd, '\0', sizeof (data_definition_t));
266 dd->name = strdup (ci->values[0].value.string);
267 if (dd->name == NULL)
273 for (i = 0; i < ci->children_num; i++)
275 oconfig_item_t *option = ci->children + i;
278 if (strcasecmp ("Type", option->key) == 0)
279 status = csnmp_config_add_data_type (dd, option);
280 else if (strcasecmp ("Table", option->key) == 0)
281 status = csnmp_config_add_data_table (dd, option);
282 else if (strcasecmp ("Instance", option->key) == 0)
283 status = csnmp_config_add_data_instance (dd, option);
284 else if (strcasecmp ("Values", option->key) == 0)
285 status = csnmp_config_add_data_values (dd, option);
288 WARNING ("snmp plugin: Option `%s' not allowed here.", option->key);
294 } /* for (ci->children) */
298 if (dd->type == NULL)
300 WARNING ("snmp plugin: `Type' not given for data `%s'", dd->name);
304 if (dd->values == NULL)
306 WARNING ("snmp plugin: No `Value' given for data `%s'", dd->name);
312 } /* while (status == 0) */
322 DEBUG ("snmp plugin: dd = { name = %s, type = %s, is_table = %s, values_len = %i }",
323 dd->name, dd->type, (dd->is_table != 0) ? "true" : "false", dd->values_len);
325 if (data_head == NULL)
329 data_definition_t *last;
331 while (last->next != NULL)
337 } /* int csnmp_config_add_data */
339 static int csnmp_config_add_host_address (host_definition_t *hd, oconfig_item_t *ci)
341 if ((ci->values_num != 1)
342 || (ci->values[0].type != OCONFIG_TYPE_STRING))
344 WARNING ("snmp plugin: The `Address' config option needs exactly one string argument.");
348 if (hd->address == NULL)
351 hd->address = strdup (ci->values[0].value.string);
352 if (hd->address == NULL)
355 DEBUG ("snmp plugin: host = %s; host->address = %s;",
356 hd->name, hd->address);
359 } /* int csnmp_config_add_host_address */
361 static int csnmp_config_add_host_community (host_definition_t *hd, oconfig_item_t *ci)
363 if ((ci->values_num != 1)
364 || (ci->values[0].type != OCONFIG_TYPE_STRING))
366 WARNING ("snmp plugin: The `Community' config option needs exactly one string argument.");
370 if (hd->community == NULL)
371 free (hd->community);
373 hd->community = strdup (ci->values[0].value.string);
374 if (hd->community == NULL)
377 DEBUG ("snmp plugin: host = %s; host->community = %s;",
378 hd->name, hd->community);
381 } /* int csnmp_config_add_host_community */
383 static int csnmp_config_add_host_version (host_definition_t *hd, oconfig_item_t *ci)
387 if ((ci->values_num != 1)
388 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
390 WARNING ("snmp plugin: The `Version' config option needs exactly one number argument.");
394 version = (int) ci->values[0].value.number;
395 if ((version != 1) && (version != 2))
397 WARNING ("snmp plugin: `Version' must either be `1' or `2'.");
401 hd->version = version;
404 } /* int csnmp_config_add_host_address */
406 static int csnmp_config_add_host_collect (host_definition_t *host,
409 data_definition_t *data;
410 data_definition_t **data_list;
414 if (ci->values_num < 1)
416 WARNING ("snmp plugin: `Collect' needs at least one argument.");
420 for (i = 0; i < ci->values_num; i++)
421 if (ci->values[i].type != OCONFIG_TYPE_STRING)
423 WARNING ("snmp plugin: All arguments to `Collect' must be strings.");
427 data_list_len = host->data_list_len + ci->values_num;
428 data_list = (data_definition_t **) realloc (host->data_list,
429 sizeof (data_definition_t *) * data_list_len);
430 if (data_list == NULL)
432 host->data_list = data_list;
434 for (i = 0; i < ci->values_num; i++)
436 for (data = data_head; data != NULL; data = data->next)
437 if (strcasecmp (ci->values[i].value.string, data->name) == 0)
442 WARNING ("snmp plugin: No such data configured: `%s'",
443 ci->values[i].value.string);
447 DEBUG ("snmp plugin: Collect: host = %s, data[%i] = %s;",
448 host->name, host->data_list_len, data->name);
450 host->data_list[host->data_list_len] = data;
451 host->data_list_len++;
452 } /* for (values_num) */
455 } /* int csnmp_config_add_host_collect */
457 static int csnmp_config_add_host_interval (host_definition_t *hd, oconfig_item_t *ci)
461 if ((ci->values_num != 1)
462 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
464 WARNING ("snmp plugin: The `Interval' config option needs exactly one number argument.");
468 interval = (int) ci->values[0].value.number;
469 hd->skip_num = interval;
470 if (hd->skip_num < 0)
474 } /* int csnmp_config_add_host_interval */
476 static int csnmp_config_add_host (oconfig_item_t *ci)
478 host_definition_t *hd;
482 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
484 WARNING ("snmp plugin: `Host' needs exactly one string argument.");
488 hd = (host_definition_t *) malloc (sizeof (host_definition_t));
491 memset (hd, '\0', sizeof (host_definition_t));
494 hd->name = strdup (ci->values[0].value.string);
495 if (hd->name == NULL)
501 hd->sess_handle = NULL;
504 hd->state = STATE_IDLE;
506 for (i = 0; i < ci->children_num; i++)
508 oconfig_item_t *option = ci->children + i;
511 if (strcasecmp ("Address", option->key) == 0)
512 status = csnmp_config_add_host_address (hd, option);
513 else if (strcasecmp ("Community", option->key) == 0)
514 status = csnmp_config_add_host_community (hd, option);
515 else if (strcasecmp ("Version", option->key) == 0)
516 status = csnmp_config_add_host_version (hd, option);
517 else if (strcasecmp ("Collect", option->key) == 0)
518 csnmp_config_add_host_collect (hd, option);
519 else if (strcasecmp ("Interval", option->key) == 0)
520 csnmp_config_add_host_interval (hd, option);
523 WARNING ("snmp plugin: csnmp_config_add_host: Option `%s' not allowed here.", option->key);
529 } /* for (ci->children) */
533 if (hd->address == NULL)
535 WARNING ("snmp plugin: `Address' not given for host `%s'", hd->name);
539 if (hd->community == NULL)
541 WARNING ("snmp plugin: `Community' not given for host `%s'", hd->name);
547 } /* while (status == 0) */
556 DEBUG ("snmp plugin: hd = { name = %s, address = %s, community = %s, version = %i }",
557 hd->name, hd->address, hd->community, hd->version);
559 if (host_head == NULL)
563 host_definition_t *last;
565 while (last->next != NULL)
571 } /* int csnmp_config_add_host */
573 static int csnmp_config (oconfig_item_t *ci)
577 call_snmp_init_once ();
579 for (i = 0; i < ci->children_num; i++)
581 oconfig_item_t *child = ci->children + i;
582 if (strcasecmp ("Data", child->key) == 0)
583 csnmp_config_add_data (child);
584 else if (strcasecmp ("Host", child->key) == 0)
585 csnmp_config_add_host (child);
588 WARNING ("snmp plugin: Ignoring unknown config option `%s'.", child->key);
590 } /* for (ci->children) */
593 } /* int csnmp_config */
595 /* End of the config stuff. Now the interesting part begins */
597 static void csnmp_host_close_session (host_definition_t *host)
601 if (host->sess_handle == NULL)
604 status = snmp_sess_close (host->sess_handle);
610 snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
612 ERROR ("snmp plugin: snmp_sess_close failed: %s",
613 (errstr == NULL) ? "Unknown problem" : errstr);
617 host->sess_handle = NULL;
618 } /* void csnmp_host_close_session */
620 static void csnmp_host_open_session (host_definition_t *host)
622 struct snmp_session sess;
624 if (host->sess_handle != NULL)
625 csnmp_host_close_session (host);
627 snmp_sess_init (&sess);
628 sess.peername = host->address;
629 sess.community = (u_char *) host->community;
630 sess.community_len = strlen (host->community);
631 sess.version = (host->version == 1) ? SNMP_VERSION_1 : SNMP_VERSION_2c;
633 /* snmp_sess_open will copy the `struct snmp_session *'. */
634 host->sess_handle = snmp_sess_open (&sess);
636 if (host->sess_handle == NULL)
640 snmp_error (&sess, NULL, NULL, &errstr);
642 ERROR ("snmp plugin: snmp_sess_open failed: %s",
643 (errstr == NULL) ? "Unknown problem" : errstr);
646 } /* void csnmp_host_open_session */
648 static value_t csnmp_value_list_to_value (struct variable_list *vl, int type)
654 if ((vl->type == ASN_INTEGER)
655 || (vl->type == ASN_UINTEGER)
656 || (vl->type == ASN_COUNTER)
657 || (vl->type == ASN_GAUGE))
659 temp = (uint32_t) *vl->val.integer;
660 DEBUG ("snmp plugin: Parsed int32 value is %llu.", temp);
662 else if (vl->type == ASN_COUNTER64)
664 temp = (uint32_t) vl->val.counter64->high;
666 temp += (uint32_t) vl->val.counter64->low;
667 DEBUG ("snmp plugin: Parsed int64 value is %llu.", temp);
671 WARNING ("snmp plugin: I don't know the ASN type `%i'", (int) vl->type);
675 if (type == DS_TYPE_COUNTER)
679 else if (type == DS_TYPE_GAUGE)
687 } /* value_t csnmp_value_list_to_value */
689 static int csnmp_dispatch_table (host_definition_t *host, data_definition_t *data,
690 csnmp_list_instances_t *instance_list,
691 csnmp_table_values_t **value_table)
693 const data_set_t *ds;
694 value_list_t vl = VALUE_LIST_INIT;
696 csnmp_list_instances_t *instance_list_ptr;
697 csnmp_table_values_t **value_table_ptr;
701 ds = plugin_get_ds (data->type);
704 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
707 assert (ds->ds_num == data->values_len);
709 value_table_ptr = (csnmp_table_values_t **) malloc (sizeof (csnmp_table_values_t *)
711 if (value_table_ptr == NULL)
713 for (i = 0; i < data->values_len; i++)
714 value_table_ptr[i] = value_table[i];
716 vl.values_len = ds->ds_num;
717 vl.values = (value_t *) malloc (sizeof (value_t) * vl.values_len);
718 if (vl.values == NULL)
720 sfree (value_table_ptr);
724 strncpy (vl.host, host->name, sizeof (vl.host));
725 vl.host[sizeof (vl.host) - 1] = '\0';
726 strcpy (vl.plugin, "snmp");
728 vl.interval = host->skip_num;
729 vl.time = time (NULL);
731 for (instance_list_ptr = instance_list;
732 instance_list_ptr != NULL;
733 instance_list_ptr = instance_list_ptr->next)
735 strncpy (vl.type_instance, instance_list_ptr->instance, sizeof (vl.type_instance));
736 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
738 for (i = 0; i < data->values_len; i++)
740 while ((value_table_ptr[i] != NULL)
741 && (value_table_ptr[i]->subid < instance_list_ptr->subid))
742 value_table_ptr[i] = value_table_ptr[i]->next;
743 if ((value_table_ptr[i] == NULL)
744 || (value_table_ptr[i]->subid != instance_list_ptr->subid))
746 vl.values[i] = value_table_ptr[i]->value;
747 } /* for (data->values_len) */
749 /* If the for-loop was aborted early, not all subid's match. */
750 if (i < data->values_len)
752 DEBUG ("snmp plugin: host = %s; data = %s; i = %i; "
754 host->name, data->name, i, instance_list_ptr->subid);
758 /* If we get here `vl.type_instance' and all `vl.values' have been set */
759 plugin_dispatch_values (data->type, &vl);
760 } /* for (instance_list) */
763 sfree (value_table_ptr);
766 } /* int csnmp_dispatch_table */
768 static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
770 struct snmp_pdu *req;
771 struct snmp_pdu *res;
772 struct variable_list *vb;
774 const data_set_t *ds;
776 uint32_t oid_list_len;
781 /* `value_table' and `value_table_ptr' implement a linked list for each
782 * value. `instance_list' and `instance_list_ptr' implement a linked list of
783 * instance names. This is used to jump gaps in the table. */
784 csnmp_list_instances_t *instance_list;
785 csnmp_list_instances_t *instance_list_ptr;
786 csnmp_table_values_t **value_table;
787 csnmp_table_values_t **value_table_ptr;
789 DEBUG ("snmp plugin: csnmp_read_table (host = %s, data = %s)",
790 host->name, data->name);
792 ds = plugin_get_ds (data->type);
795 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
799 if (ds->ds_num != data->values_len)
801 ERROR ("snmp plugin: DataSet `%s' requires %i values, but config talks about %i",
802 data->type, ds->ds_num, data->values_len);
806 /* We need a copy of all the OIDs, because GETNEXT will destroy them. */
807 oid_list_len = data->values_len + 1;
808 oid_list = (oid_t *) malloc (sizeof (oid_t) * (oid_list_len));
809 if (oid_list == NULL)
811 memcpy (oid_list, &data->instance.oid, sizeof (oid_t));
812 for (i = 0; i < data->values_len; i++)
813 memcpy (oid_list + (i + 1), data->values + i, sizeof (oid_t));
815 /* Allocate the `value_table' */
816 value_table = (csnmp_table_values_t **) malloc (sizeof (csnmp_table_values_t *)
817 * 2 * data->values_len);
818 if (value_table == NULL)
823 memset (value_table, '\0', sizeof (csnmp_table_values_t *) * 2 * data->values_len);
824 value_table_ptr = value_table + data->values_len;
826 instance_list = NULL;
827 instance_list_ptr = NULL;
832 csnmp_list_instances_t *il;
834 req = snmp_pdu_create (SNMP_MSG_GETNEXT);
837 ERROR ("snmp plugin: snmp_pdu_create failed.");
842 for (i = 0; i < oid_list_len; i++)
843 snmp_add_null_var (req, oid_list[i].oid, oid_list[i].oid_len);
845 status = snmp_sess_synch_response (host->sess_handle, req, &res);
847 if (status != STAT_SUCCESS)
851 snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
852 ERROR ("snmp plugin: snmp_sess_synch_response failed: %s",
853 (errstr == NULL) ? "Unknown problem" : errstr);
854 csnmp_host_close_session (host);
860 assert (res != NULL);
869 /* Check if we left the subtree */
870 if (snmp_oid_ncompare (data->instance.oid.oid, data->instance.oid.oid_len,
871 vb->name, vb->name_length,
872 data->instance.oid.oid_len) != 0)
875 /* Allocate a new `csnmp_list_instances_t', insert the instance name and
876 * add it to the list */
877 il = (csnmp_list_instances_t *) malloc (sizeof (csnmp_list_instances_t));
883 il->subid = vb->name[vb->name_length - 1];
886 /* Get instance name */
887 if ((vb->type == ASN_OCTET_STR) || (vb->type == ASN_BIT_STR))
892 instance_len = sizeof (il->instance) - 1;
893 if (instance_len > vb->val_len)
894 instance_len = vb->val_len;
896 strncpy (il->instance, (char *) ((vb->type == ASN_OCTET_STR)
898 : vb->val.bitstring),
900 il->instance[instance_len] = '\0';
902 for (ptr = il->instance; *ptr != '\0'; ptr++)
904 if ((*ptr > 0) && (*ptr < 32))
906 else if (*ptr == '/')
909 DEBUG ("snmp plugin: il->instance = `%s';", il->instance);
913 value_t val = csnmp_value_list_to_value (vb, DS_TYPE_COUNTER);
914 snprintf (il->instance, sizeof (il->instance),
915 "%llu", val.counter);
917 il->instance[sizeof (il->instance) - 1] = '\0';
918 DEBUG ("snmp plugin: data = `%s'; il->instance = `%s';",
919 data->name, il->instance);
921 if (instance_list_ptr == NULL)
924 instance_list_ptr->next = il;
925 instance_list_ptr = il;
927 /* Copy OID to oid_list[0] */
928 memcpy (oid_list[0].oid, vb->name, sizeof (oid) * vb->name_length);
929 oid_list[0].oid_len = vb->name_length;
931 for (i = 0; i < data->values_len; i++)
933 csnmp_table_values_t *vt;
935 vb = vb->next_variable;
942 /* Check if we left the subtree */
943 if (snmp_oid_ncompare (data->values[i].oid,
944 data->values[i].oid_len,
945 vb->name, vb->name_length,
946 data->values[i].oid_len) != 0)
948 DEBUG ("snmp plugin: host = %s; data = %s; Value %i left its subtree.",
949 host->name, data->name, i);
953 if ((value_table_ptr[i] != NULL)
954 && (vb->name[vb->name_length - 1] <= value_table_ptr[i]->subid))
956 DEBUG ("snmp plugin: host = %s; data = %s; i = %i; SUBID is not increasing.",
957 host->name, data->name, i);
961 vt = (csnmp_table_values_t *) malloc (sizeof (csnmp_table_values_t));
964 vt->subid = vb->name[vb->name_length - 1];
965 vt->value = csnmp_value_list_to_value (vb, ds->ds[i].type);
968 if (value_table_ptr[i] == NULL)
971 value_table_ptr[i]->next = vt;
972 value_table_ptr[i] = vt;
975 /* Copy OID to oid_list[i + 1] */
976 memcpy (oid_list[i + 1].oid, vb->name, sizeof (oid) * vb->name_length);
977 oid_list[i + 1].oid_len = vb->name_length;
978 } /* for (i = data->values_len) */
983 } /* while (status == 0) */
986 csnmp_dispatch_table (host, data, instance_list, value_table);
988 /* Free all allocated variables here */
989 while (instance_list != NULL)
991 instance_list_ptr = instance_list->next;
992 sfree (instance_list);
993 instance_list = instance_list_ptr;
996 for (i = 0; i < data->values_len; i++)
998 csnmp_table_values_t *tmp;
999 while (value_table[i] != NULL)
1001 tmp = value_table[i]->next;
1002 sfree (value_table[i]);
1003 value_table[i] = tmp;
1007 sfree (value_table);
1011 } /* int csnmp_read_table */
1013 static int csnmp_read_value (host_definition_t *host, data_definition_t *data)
1015 struct snmp_pdu *req;
1016 struct snmp_pdu *res;
1017 struct variable_list *vb;
1019 const data_set_t *ds;
1020 value_list_t vl = VALUE_LIST_INIT;
1025 DEBUG ("snmp plugin: csnmp_read_value (host = %s, data = %s)",
1026 host->name, data->name);
1028 ds = plugin_get_ds (data->type);
1031 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
1035 if (ds->ds_num != data->values_len)
1037 ERROR ("snmp plugin: DataSet `%s' requires %i values, but config talks about %i",
1038 data->type, ds->ds_num, data->values_len);
1042 vl.values_len = ds->ds_num;
1043 vl.values = (value_t *) malloc (sizeof (value_t) * vl.values_len);
1044 if (vl.values == NULL)
1046 for (i = 0; i < vl.values_len; i++)
1048 if (ds->ds[i].type == DS_TYPE_COUNTER)
1049 vl.values[i].counter = 0;
1051 vl.values[i].gauge = NAN;
1054 strncpy (vl.host, host->name, sizeof (vl.host));
1055 vl.host[sizeof (vl.host) - 1] = '\0';
1056 strcpy (vl.plugin, "snmp");
1057 strncpy (vl.type_instance, data->instance.string, sizeof (vl.type_instance));
1058 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
1060 vl.interval = host->skip_num;
1062 req = snmp_pdu_create (SNMP_MSG_GET);
1065 ERROR ("snmp plugin: snmp_pdu_create failed.");
1070 for (i = 0; i < data->values_len; i++)
1071 snmp_add_null_var (req, data->values[i].oid, data->values[i].oid_len);
1072 status = snmp_sess_synch_response (host->sess_handle, req, &res);
1074 if (status != STAT_SUCCESS)
1076 char *errstr = NULL;
1078 snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
1079 ERROR ("snmp plugin: snmp_sess_synch_response failed: %s",
1080 (errstr == NULL) ? "Unknown problem" : errstr);
1081 csnmp_host_close_session (host);
1087 vl.time = time (NULL);
1089 for (vb = res->variables; vb != NULL; vb = vb->next_variable)
1092 snprint_variable (buffer, sizeof (buffer),
1093 vb->name, vb->name_length, vb);
1094 DEBUG ("snmp plugin: Got this variable: %s", buffer);
1096 for (i = 0; i < data->values_len; i++)
1097 if (snmp_oid_compare (data->values[i].oid, data->values[i].oid_len,
1098 vb->name, vb->name_length) == 0)
1099 vl.values[i] = csnmp_value_list_to_value (vb, ds->ds[i].type);
1100 } /* for (res->variables) */
1102 snmp_free_pdu (res);
1104 DEBUG ("snmp plugin: -> plugin_dispatch_values (%s, &vl);", data->type);
1105 plugin_dispatch_values (data->type, &vl);
1109 } /* int csnmp_read_value */
1111 static int csnmp_read_host (host_definition_t *host)
1115 DEBUG ("snmp plugin: csnmp_read_host (%s);", host->name);
1117 if (host->sess_handle == NULL)
1118 csnmp_host_open_session (host);
1120 if (host->sess_handle == NULL)
1123 for (i = 0; i < host->data_list_len; i++)
1125 data_definition_t *data = host->data_list[i];
1128 csnmp_read_table (host, data);
1130 csnmp_read_value (host, data);
1134 } /* int csnmp_read_host */
1136 static void *csnmp_read_thread (void *data)
1138 host_definition_t *host;
1140 pthread_mutex_lock (&host_lock);
1141 while (do_shutdown == 0)
1143 pthread_cond_wait (&host_cond, &host_lock);
1145 for (host = host_head; host != NULL; host = host->next)
1147 if (do_shutdown != 0)
1149 if (host->state != STATE_WAIT)
1152 host->state = STATE_BUSY;
1153 pthread_mutex_unlock (&host_lock);
1154 csnmp_read_host (host);
1155 pthread_mutex_lock (&host_lock);
1156 host->state = STATE_IDLE;
1158 } /* while (do_shutdown == 0) */
1159 pthread_mutex_unlock (&host_lock);
1161 pthread_exit ((void *) 0);
1162 return ((void *) 0);
1163 } /* void *csnmp_read_thread */
1165 static int csnmp_init (void)
1167 host_definition_t *host;
1170 if (host_head == NULL)
1173 call_snmp_init_once ();
1176 for (host = host_head; host != NULL; host = host->next)
1179 /* We need to initialize `skip_num' here, because `interval_g' isn't
1180 * initialized during `configure'. */
1181 host->skip_left = interval_g;
1182 if (host->skip_num == 0)
1184 host->skip_num = interval_g;
1186 else if (host->skip_num < interval_g)
1188 host->skip_num = interval_g;
1189 WARNING ("snmp plugin: Data for host `%s' will be collected every %i seconds.",
1190 host->name, host->skip_num);
1193 csnmp_host_open_session (host);
1196 /* Now start the reading threads */
1197 if (threads_num > 3)
1199 threads_num = 3 + ((threads_num - 3) / 10);
1200 if (threads_num > 10)
1204 threads = (pthread_t *) malloc (threads_num * sizeof (pthread_t));
1205 if (threads == NULL)
1207 memset (threads, '\0', threads_num * sizeof (pthread_t));
1209 for (i = 0; i < threads_num; i++)
1210 pthread_create (threads + i, NULL, csnmp_read_thread, (void *) 0);
1213 } /* int csnmp_init */
1215 static int csnmp_read (void)
1217 host_definition_t *host;
1220 if (host_head == NULL)
1222 INFO ("snmp plugin: No hosts configured.");
1228 pthread_mutex_lock (&host_lock);
1229 for (host = host_head; host != NULL; host = host->next)
1231 if (host->state != STATE_IDLE)
1234 host->skip_left -= interval_g;
1235 if (host->skip_left >= interval_g)
1238 host->state = STATE_WAIT;
1240 host->skip_left = host->skip_num;
1243 pthread_cond_broadcast (&host_cond);
1244 pthread_mutex_unlock (&host_lock);
1247 } /* int csnmp_read */
1249 static int csnmp_shutdown (void)
1251 host_definition_t *host_this;
1252 host_definition_t *host_next;
1254 data_definition_t *data_this;
1255 data_definition_t *data_next;
1259 pthread_mutex_lock (&host_lock);
1261 pthread_cond_broadcast (&host_cond);
1262 pthread_mutex_unlock (&host_lock);
1264 for (i = 0; i < threads_num; i++)
1265 pthread_join (threads[i], NULL);
1267 /* Now that all the threads have exited, let's free all the global variables.
1268 * This isn't really neccessary, I guess, but I think it's good stile to do
1270 host_this = host_head;
1272 while (host_this != NULL)
1274 host_next = host_this->next;
1276 csnmp_host_close_session (host_this);
1278 sfree (host_this->name);
1279 sfree (host_this->address);
1280 sfree (host_this->community);
1281 sfree (host_this->data_list);
1284 host_this = host_next;
1287 data_this = data_head;
1289 while (data_this != NULL)
1291 data_next = data_this->next;
1293 sfree (data_this->name);
1294 sfree (data_this->type);
1295 sfree (data_this->values);
1298 data_this = data_next;
1302 } /* int csnmp_shutdown */
1304 void module_register (void)
1306 plugin_register_complex_config ("snmp", csnmp_config);
1307 plugin_register_init ("snmp", csnmp_init);
1308 plugin_register_read ("snmp", csnmp_read);
1309 plugin_register_shutdown ("snmp", csnmp_shutdown);
1310 } /* void module_register */
1313 * vim: shiftwidth=2 softtabstop=2 tabstop=8