1 /**
2 * collectd - src/snmp.c
3 * Copyright (C) 2007 Florian octo Forster
4 *
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.
8 *
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.
13 *
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
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
25 #include "utils_complain.h"
27 #include <pthread.h>
29 #include <net-snmp/net-snmp-config.h>
30 #include <net-snmp/net-snmp-includes.h>
32 /*
33 * Private data structes
34 */
35 struct oid_s
36 {
37 oid oid[MAX_OID_LEN];
38 size_t oid_len;
39 };
40 typedef struct oid_s oid_t;
42 union instance_u
43 {
44 char string[DATA_MAX_NAME_LEN];
45 oid_t oid;
46 };
47 typedef union instance_u instance_t;
49 struct data_definition_s
50 {
51 char *name; /* used to reference this from the `Collect' option */
52 char *type; /* used to find the data_set */
53 int is_table;
54 instance_t instance;
55 char *instance_prefix;
56 oid_t *values;
57 int values_len;
58 double scale;
59 double shift;
60 struct data_definition_s *next;
61 };
62 typedef struct data_definition_s data_definition_t;
64 struct host_definition_s
65 {
66 char *name;
67 char *address;
68 char *community;
69 int version;
70 void *sess_handle;
71 c_complain_t complaint;
72 uint32_t interval;
73 data_definition_t **data_list;
74 int data_list_len;
75 };
76 typedef struct host_definition_s host_definition_t;
78 /* These two types are used to cache values in `csnmp_read_table' to handle
79 * gaps in tables. */
80 struct csnmp_list_instances_s
81 {
82 oid subid;
83 char instance[DATA_MAX_NAME_LEN];
84 struct csnmp_list_instances_s *next;
85 };
86 typedef struct csnmp_list_instances_s csnmp_list_instances_t;
88 struct csnmp_table_values_s
89 {
90 oid subid;
91 value_t value;
92 struct csnmp_table_values_s *next;
93 };
94 typedef struct csnmp_table_values_s csnmp_table_values_t;
96 /*
97 * Private variables
98 */
99 static data_definition_t *data_head = NULL;
101 /*
102 * Prototypes
103 */
104 static int csnmp_read_host (user_data_t *ud);
106 /*
107 * Private functions
108 */
109 static void csnmp_host_close_session (host_definition_t *host) /* {{{ */
110 {
111 if (host->sess_handle == NULL)
112 return;
114 snmp_sess_close (host->sess_handle);
115 host->sess_handle = NULL;
116 } /* }}} void csnmp_host_close_session */
118 static void csnmp_host_definition_destroy (void *arg) /* {{{ */
119 {
120 host_definition_t *hd;
122 hd = arg;
124 if (hd == NULL)
125 return;
127 if (hd->name != NULL)
128 {
129 DEBUG ("snmp plugin: Destroying host definition for host `%s'.",
130 hd->name);
131 }
133 csnmp_host_close_session (hd);
135 sfree (hd->name);
136 sfree (hd->address);
137 sfree (hd->community);
138 sfree (hd->data_list);
140 sfree (hd);
141 } /* }}} void csnmp_host_definition_destroy */
143 /* Many functions to handle the configuration. {{{ */
144 /* First there are many functions which do configuration stuff. It's a big
145 * bloated and messy, I'm afraid. */
147 /*
148 * Callgraph for the config stuff:
149 * csnmp_config
150 * +-> call_snmp_init_once
151 * +-> csnmp_config_add_data
152 * ! +-> csnmp_config_add_data_type
153 * ! +-> csnmp_config_add_data_table
154 * ! +-> csnmp_config_add_data_instance
155 * ! +-> csnmp_config_add_data_instance_prefix
156 * ! +-> csnmp_config_add_data_values
157 * +-> csnmp_config_add_host
158 * +-> csnmp_config_add_host_address
159 * +-> csnmp_config_add_host_community
160 * +-> csnmp_config_add_host_version
161 * +-> csnmp_config_add_host_collect
162 * +-> csnmp_config_add_host_interval
163 */
164 static void call_snmp_init_once (void)
165 {
166 static int have_init = 0;
168 if (have_init == 0)
169 init_snmp (PACKAGE_NAME);
170 have_init = 1;
171 } /* void call_snmp_init_once */
173 static int csnmp_config_add_data_type (data_definition_t *dd, oconfig_item_t *ci)
174 {
175 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
176 {
177 WARNING ("snmp plugin: `Type' needs exactly one string argument.");
178 return (-1);
179 }
181 sfree (dd->type);
182 dd->type = strdup (ci->values[0].value.string);
183 if (dd->type == NULL)
184 return (-1);
186 return (0);
187 } /* int csnmp_config_add_data_type */
189 static int csnmp_config_add_data_table (data_definition_t *dd, oconfig_item_t *ci)
190 {
191 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_BOOLEAN))
192 {
193 WARNING ("snmp plugin: `Table' needs exactly one boolean argument.");
194 return (-1);
195 }
197 dd->is_table = ci->values[0].value.boolean ? 1 : 0;
199 return (0);
200 } /* int csnmp_config_add_data_table */
202 static int csnmp_config_add_data_instance (data_definition_t *dd, oconfig_item_t *ci)
203 {
204 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
205 {
206 WARNING ("snmp plugin: `Instance' needs exactly one string argument.");
207 return (-1);
208 }
210 if (dd->is_table)
211 {
212 /* Instance is an OID */
213 dd->instance.oid.oid_len = MAX_OID_LEN;
215 if (!read_objid (ci->values[0].value.string,
216 dd->instance.oid.oid, &dd->instance.oid.oid_len))
217 {
218 ERROR ("snmp plugin: read_objid (%s) failed.",
219 ci->values[0].value.string);
220 return (-1);
221 }
222 }
223 else
224 {
225 /* Instance is a simple string */
226 sstrncpy (dd->instance.string, ci->values[0].value.string,
227 sizeof (dd->instance.string));
228 }
230 return (0);
231 } /* int csnmp_config_add_data_instance */
233 static int csnmp_config_add_data_instance_prefix (data_definition_t *dd,
234 oconfig_item_t *ci)
235 {
236 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
237 {
238 WARNING ("snmp plugin: `InstancePrefix' needs exactly one string argument.");
239 return (-1);
240 }
242 if (!dd->is_table)
243 {
244 WARNING ("snmp plugin: data %s: InstancePrefix is ignored when `Table' "
245 "is set to `false'.", dd->name);
246 return (-1);
247 }
249 sfree (dd->instance_prefix);
250 dd->instance_prefix = strdup (ci->values[0].value.string);
251 if (dd->instance_prefix == NULL)
252 return (-1);
254 return (0);
255 } /* int csnmp_config_add_data_instance_prefix */
257 static int csnmp_config_add_data_values (data_definition_t *dd, oconfig_item_t *ci)
258 {
259 int i;
261 if (ci->values_num < 1)
262 {
263 WARNING ("snmp plugin: `Values' needs at least one argument.");
264 return (-1);
265 }
267 for (i = 0; i < ci->values_num; i++)
268 if (ci->values[i].type != OCONFIG_TYPE_STRING)
269 {
270 WARNING ("snmp plugin: `Values' needs only string argument.");
271 return (-1);
272 }
274 sfree (dd->values);
275 dd->values_len = 0;
276 dd->values = (oid_t *) malloc (sizeof (oid_t) * ci->values_num);
277 if (dd->values == NULL)
278 return (-1);
279 dd->values_len = ci->values_num;
281 for (i = 0; i < ci->values_num; i++)
282 {
283 dd->values[i].oid_len = MAX_OID_LEN;
285 if (NULL == snmp_parse_oid (ci->values[i].value.string,
286 dd->values[i].oid, &dd->values[i].oid_len))
287 {
288 ERROR ("snmp plugin: snmp_parse_oid (%s) failed.",
289 ci->values[i].value.string);
290 free (dd->values);
291 dd->values = NULL;
292 dd->values_len = 0;
293 return (-1);
294 }
295 }
297 return (0);
298 } /* int csnmp_config_add_data_instance */
300 static int csnmp_config_add_data_shift (data_definition_t *dd, oconfig_item_t *ci)
301 {
302 if ((ci->values_num != 1)
303 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
304 {
305 WARNING ("snmp plugin: The `Shift' config option needs exactly one number argument.");
306 return (-1);
307 }
309 dd->shift = ci->values[0].value.number;
311 return (0);
312 } /* int csnmp_config_add_data_shift */
314 static int csnmp_config_add_data_scale (data_definition_t *dd, oconfig_item_t *ci)
315 {
316 if ((ci->values_num != 1)
317 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
318 {
319 WARNING ("snmp plugin: The `Scale' config option needs exactly one number argument.");
320 return (-1);
321 }
323 dd->scale = ci->values[0].value.number;
325 return (0);
326 } /* int csnmp_config_add_data_scale */
328 static int csnmp_config_add_data (oconfig_item_t *ci)
329 {
330 data_definition_t *dd;
331 int status = 0;
332 int i;
334 if ((ci->values_num != 1)
335 || (ci->values[0].type != OCONFIG_TYPE_STRING))
336 {
337 WARNING ("snmp plugin: The `Data' config option needs exactly one string argument.");
338 return (-1);
339 }
341 dd = (data_definition_t *) malloc (sizeof (data_definition_t));
342 if (dd == NULL)
343 return (-1);
344 memset (dd, '\0', sizeof (data_definition_t));
346 dd->name = strdup (ci->values[0].value.string);
347 if (dd->name == NULL)
348 {
349 free (dd);
350 return (-1);
351 }
352 dd->scale = 1.0;
353 dd->shift = 0.0;
355 for (i = 0; i < ci->children_num; i++)
356 {
357 oconfig_item_t *option = ci->children + i;
358 status = 0;
360 if (strcasecmp ("Type", option->key) == 0)
361 status = csnmp_config_add_data_type (dd, option);
362 else if (strcasecmp ("Table", option->key) == 0)
363 status = csnmp_config_add_data_table (dd, option);
364 else if (strcasecmp ("Instance", option->key) == 0)
365 status = csnmp_config_add_data_instance (dd, option);
366 else if (strcasecmp ("InstancePrefix", option->key) == 0)
367 status = csnmp_config_add_data_instance_prefix (dd, option);
368 else if (strcasecmp ("Values", option->key) == 0)
369 status = csnmp_config_add_data_values (dd, option);
370 else if (strcasecmp ("Shift", option->key) == 0)
371 status = csnmp_config_add_data_shift (dd, option);
372 else if (strcasecmp ("Scale", option->key) == 0)
373 status = csnmp_config_add_data_scale (dd, option);
374 else
375 {
376 WARNING ("snmp plugin: Option `%s' not allowed here.", option->key);
377 status = -1;
378 }
380 if (status != 0)
381 break;
382 } /* for (ci->children) */
384 while (status == 0)
385 {
386 if (dd->type == NULL)
387 {
388 WARNING ("snmp plugin: `Type' not given for data `%s'", dd->name);
389 status = -1;
390 break;
391 }
392 if (dd->values == NULL)
393 {
394 WARNING ("snmp plugin: No `Value' given for data `%s'", dd->name);
395 status = -1;
396 break;
397 }
399 break;
400 } /* while (status == 0) */
402 if (status != 0)
403 {
404 sfree (dd->name);
405 sfree (dd->instance_prefix);
406 sfree (dd->values);
407 sfree (dd);
408 return (-1);
409 }
411 DEBUG ("snmp plugin: dd = { name = %s, type = %s, is_table = %s, values_len = %i }",
412 dd->name, dd->type, (dd->is_table != 0) ? "true" : "false", dd->values_len);
414 if (data_head == NULL)
415 data_head = dd;
416 else
417 {
418 data_definition_t *last;
419 last = data_head;
420 while (last->next != NULL)
421 last = last->next;
422 last->next = dd;
423 }
425 return (0);
426 } /* int csnmp_config_add_data */
428 static int csnmp_config_add_host_address (host_definition_t *hd, oconfig_item_t *ci)
429 {
430 if ((ci->values_num != 1)
431 || (ci->values[0].type != OCONFIG_TYPE_STRING))
432 {
433 WARNING ("snmp plugin: The `Address' config option needs exactly one string argument.");
434 return (-1);
435 }
437 if (hd->address == NULL)
438 free (hd->address);
440 hd->address = strdup (ci->values[0].value.string);
441 if (hd->address == NULL)
442 return (-1);
444 DEBUG ("snmp plugin: host = %s; host->address = %s;",
445 hd->name, hd->address);
447 return (0);
448 } /* int csnmp_config_add_host_address */
450 static int csnmp_config_add_host_community (host_definition_t *hd, oconfig_item_t *ci)
451 {
452 if ((ci->values_num != 1)
453 || (ci->values[0].type != OCONFIG_TYPE_STRING))
454 {
455 WARNING ("snmp plugin: The `Community' config option needs exactly one string argument.");
456 return (-1);
457 }
459 if (hd->community == NULL)
460 free (hd->community);
462 hd->community = strdup (ci->values[0].value.string);
463 if (hd->community == NULL)
464 return (-1);
466 DEBUG ("snmp plugin: host = %s; host->community = %s;",
467 hd->name, hd->community);
469 return (0);
470 } /* int csnmp_config_add_host_community */
472 static int csnmp_config_add_host_version (host_definition_t *hd, oconfig_item_t *ci)
473 {
474 int version;
476 if ((ci->values_num != 1)
477 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
478 {
479 WARNING ("snmp plugin: The `Version' config option needs exactly one number argument.");
480 return (-1);
481 }
483 version = (int) ci->values[0].value.number;
484 if ((version != 1) && (version != 2))
485 {
486 WARNING ("snmp plugin: `Version' must either be `1' or `2'.");
487 return (-1);
488 }
490 hd->version = version;
492 return (0);
493 } /* int csnmp_config_add_host_address */
495 static int csnmp_config_add_host_collect (host_definition_t *host,
496 oconfig_item_t *ci)
497 {
498 data_definition_t *data;
499 data_definition_t **data_list;
500 int data_list_len;
501 int i;
503 if (ci->values_num < 1)
504 {
505 WARNING ("snmp plugin: `Collect' needs at least one argument.");
506 return (-1);
507 }
509 for (i = 0; i < ci->values_num; i++)
510 if (ci->values[i].type != OCONFIG_TYPE_STRING)
511 {
512 WARNING ("snmp plugin: All arguments to `Collect' must be strings.");
513 return (-1);
514 }
516 data_list_len = host->data_list_len + ci->values_num;
517 data_list = (data_definition_t **) realloc (host->data_list,
518 sizeof (data_definition_t *) * data_list_len);
519 if (data_list == NULL)
520 return (-1);
521 host->data_list = data_list;
523 for (i = 0; i < ci->values_num; i++)
524 {
525 for (data = data_head; data != NULL; data = data->next)
526 if (strcasecmp (ci->values[i].value.string, data->name) == 0)
527 break;
529 if (data == NULL)
530 {
531 WARNING ("snmp plugin: No such data configured: `%s'",
532 ci->values[i].value.string);
533 continue;
534 }
536 DEBUG ("snmp plugin: Collect: host = %s, data[%i] = %s;",
537 host->name, host->data_list_len, data->name);
539 host->data_list[host->data_list_len] = data;
540 host->data_list_len++;
541 } /* for (values_num) */
543 return (0);
544 } /* int csnmp_config_add_host_collect */
546 static int csnmp_config_add_host_interval (host_definition_t *hd, oconfig_item_t *ci)
547 {
548 if ((ci->values_num != 1)
549 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
550 {
551 WARNING ("snmp plugin: The `Interval' config option needs exactly one number argument.");
552 return (-1);
553 }
555 hd->interval = ci->values[0].value.number >= 0
556 ? (uint32_t) ci->values[0].value.number
557 : 0;
559 return (0);
560 } /* int csnmp_config_add_host_interval */
562 static int csnmp_config_add_host (oconfig_item_t *ci)
563 {
564 host_definition_t *hd;
565 int status = 0;
566 int i;
568 /* Registration stuff. */
569 char cb_name[DATA_MAX_NAME_LEN];
570 user_data_t cb_data;
571 struct timespec cb_interval;
573 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
574 {
575 WARNING ("snmp plugin: `Host' needs exactly one string argument.");
576 return (-1);
577 }
579 hd = (host_definition_t *) malloc (sizeof (host_definition_t));
580 if (hd == NULL)
581 return (-1);
582 memset (hd, '\0', sizeof (host_definition_t));
583 hd->version = 2;
584 C_COMPLAIN_INIT (&hd->complaint);
586 hd->name = strdup (ci->values[0].value.string);
587 if (hd->name == NULL)
588 {
589 free (hd);
590 return (-1);
591 }
593 hd->sess_handle = NULL;
594 hd->interval = 0;
596 for (i = 0; i < ci->children_num; i++)
597 {
598 oconfig_item_t *option = ci->children + i;
599 status = 0;
601 if (strcasecmp ("Address", option->key) == 0)
602 status = csnmp_config_add_host_address (hd, option);
603 else if (strcasecmp ("Community", option->key) == 0)
604 status = csnmp_config_add_host_community (hd, option);
605 else if (strcasecmp ("Version", option->key) == 0)
606 status = csnmp_config_add_host_version (hd, option);
607 else if (strcasecmp ("Collect", option->key) == 0)
608 csnmp_config_add_host_collect (hd, option);
609 else if (strcasecmp ("Interval", option->key) == 0)
610 csnmp_config_add_host_interval (hd, option);
611 else
612 {
613 WARNING ("snmp plugin: csnmp_config_add_host: Option `%s' not allowed here.", option->key);
614 status = -1;
615 }
617 if (status != 0)
618 break;
619 } /* for (ci->children) */
621 while (status == 0)
622 {
623 if (hd->address == NULL)
624 {
625 WARNING ("snmp plugin: `Address' not given for host `%s'", hd->name);
626 status = -1;
627 break;
628 }
629 if (hd->community == NULL)
630 {
631 WARNING ("snmp plugin: `Community' not given for host `%s'", hd->name);
632 status = -1;
633 break;
634 }
636 break;
637 } /* while (status == 0) */
639 if (status != 0)
640 {
641 csnmp_host_definition_destroy (hd);
642 return (-1);
643 }
645 DEBUG ("snmp plugin: hd = { name = %s, address = %s, community = %s, version = %i }",
646 hd->name, hd->address, hd->community, hd->version);
648 ssnprintf (cb_name, sizeof (cb_name), "snmp-%s", hd->name);
650 memset (&cb_data, 0, sizeof (cb_data));
651 cb_data.data = hd;
652 cb_data.free_func = csnmp_host_definition_destroy;
654 memset (&cb_interval, 0, sizeof (cb_interval));
655 if (hd->interval != 0)
656 cb_interval.tv_sec = (time_t) hd->interval;
658 status = plugin_register_complex_read (/* group = */ NULL, cb_name,
659 csnmp_read_host, /* interval = */ &cb_interval,
660 /* user_data = */ &cb_data);
661 if (status != 0)
662 {
663 ERROR ("snmp plugin: Registering complex read function failed.");
664 csnmp_host_definition_destroy (hd);
665 return (-1);
666 }
668 return (0);
669 } /* int csnmp_config_add_host */
671 static int csnmp_config (oconfig_item_t *ci)
672 {
673 int i;
675 call_snmp_init_once ();
677 for (i = 0; i < ci->children_num; i++)
678 {
679 oconfig_item_t *child = ci->children + i;
680 if (strcasecmp ("Data", child->key) == 0)
681 csnmp_config_add_data (child);
682 else if (strcasecmp ("Host", child->key) == 0)
683 csnmp_config_add_host (child);
684 else
685 {
686 WARNING ("snmp plugin: Ignoring unknown config option `%s'.", child->key);
687 }
688 } /* for (ci->children) */
690 return (0);
691 } /* int csnmp_config */
693 /* }}} End of the config stuff. Now the interesting part begins */
695 static void csnmp_host_open_session (host_definition_t *host)
696 {
697 struct snmp_session sess;
699 if (host->sess_handle != NULL)
700 csnmp_host_close_session (host);
702 snmp_sess_init (&sess);
703 sess.peername = host->address;
704 sess.community = (u_char *) host->community;
705 sess.community_len = strlen (host->community);
706 sess.version = (host->version == 1) ? SNMP_VERSION_1 : SNMP_VERSION_2c;
708 /* snmp_sess_open will copy the `struct snmp_session *'. */
709 host->sess_handle = snmp_sess_open (&sess);
711 if (host->sess_handle == NULL)
712 {
713 char *errstr = NULL;
715 snmp_error (&sess, NULL, NULL, &errstr);
717 ERROR ("snmp plugin: host %s: snmp_sess_open failed: %s",
718 host->name, (errstr == NULL) ? "Unknown problem" : errstr);
719 sfree (errstr);
720 }
721 } /* void csnmp_host_open_session */
723 /* TODO: Check if negative values wrap around. Problem: negative temperatures. */
724 static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
725 double scale, double shift)
726 {
727 value_t ret;
728 uint64_t tmp_unsigned = 0;
729 int64_t tmp_signed = 0;
730 _Bool defined = 1;
731 /* Set to true when the original SNMP type appears to have been signed. */
732 _Bool prefer_signed = 0;
734 if ((vl->type == ASN_INTEGER)
735 || (vl->type == ASN_UINTEGER)
736 || (vl->type == ASN_COUNTER)
737 #ifdef ASN_TIMETICKS
738 || (vl->type == ASN_TIMETICKS)
739 #endif
740 || (vl->type == ASN_GAUGE))
741 {
742 tmp_unsigned = (uint32_t) *vl->val.integer;
743 tmp_signed = (int32_t) *vl->val.integer;
745 if ((vl->type == ASN_INTEGER)
746 || (vl->type == ASN_GAUGE))
747 prefer_signed = 1;
749 DEBUG ("snmp plugin: Parsed int32 value is %"PRIu64".", tmp_unsigned);
750 }
751 else if (vl->type == ASN_COUNTER64)
752 {
753 tmp_unsigned = (uint32_t) vl->val.counter64->high;
754 tmp_unsigned = tmp_unsigned << 32;
755 tmp_unsigned += (uint32_t) vl->val.counter64->low;
756 tmp_signed = (int64_t) tmp_unsigned;
757 DEBUG ("snmp plugin: Parsed int64 value is %"PRIu64".", tmp_unsigned);
758 }
759 else if (vl->type == ASN_OCTET_STR)
760 {
761 /* We'll handle this later.. */
762 }
763 else
764 {
765 char oid_buffer[1024];
767 memset (oid_buffer, 0, sizeof (oid_buffer));
768 snprint_objid (oid_buffer, sizeof (oid_buffer) - 1,
769 vl->name, vl->name_length);
771 #ifdef ASN_NULL
772 if (vl->type == ASN_NULL)
773 INFO ("snmp plugin: OID \"%s\" is undefined (type ASN_NULL)",
774 oid_buffer);
775 else
776 #endif
777 WARNING ("snmp plugin: I don't know the ASN type \"%i\" (OID: %s)",
778 (int) vl->type, oid_buffer);
780 defined = 0;
781 }
783 if (vl->type == ASN_OCTET_STR)
784 {
785 int status = -1;
787 if (vl->val.string != NULL)
788 {
789 char string[64];
790 size_t string_length;
792 string_length = sizeof (string) - 1;
793 if (vl->val_len < string_length)
794 string_length = vl->val_len;
796 /* The strings we get from the Net-SNMP library may not be null
797 * terminated. That is why we're using `memcpy' here and not `strcpy'.
798 * `string_length' is set to `vl->val_len' which holds the length of the
799 * string. -octo */
800 memcpy (string, vl->val.string, string_length);
801 string[string_length] = 0;
803 status = parse_value (string, &ret, type);
804 if (status != 0)
805 {
806 ERROR ("snmp plugin: csnmp_value_list_to_value: Parsing string as %s failed: %s",
807 DS_TYPE_TO_STRING (type), string);
808 }
809 }
811 if (status != 0)
812 {
813 switch (type)
814 {
815 case DS_TYPE_COUNTER:
816 case DS_TYPE_DERIVE:
817 case DS_TYPE_ABSOLUTE:
818 memset (&ret, 0, sizeof (ret));
819 break;
821 case DS_TYPE_GAUGE:
822 ret.gauge = NAN;
823 break;
825 default:
826 ERROR ("snmp plugin: csnmp_value_list_to_value: Unknown "
827 "data source type: %i.", type);
828 ret.gauge = NAN;
829 }
830 }
831 } /* if (vl->type == ASN_OCTET_STR) */
832 else if (type == DS_TYPE_COUNTER)
833 {
834 ret.counter = tmp_unsigned;
835 }
836 else if (type == DS_TYPE_GAUGE)
837 {
838 if (!defined)
839 ret.gauge = NAN;
840 else if (prefer_signed)
841 ret.gauge = (scale * tmp_signed) + shift;
842 else
843 ret.gauge = (scale * tmp_unsigned) + shift;
844 }
845 else if (type == DS_TYPE_DERIVE)
846 {
847 if (prefer_signed)
848 ret.derive = (derive_t) tmp_signed;
849 else
850 ret.derive = (derive_t) tmp_unsigned;
851 }
852 else if (type == DS_TYPE_ABSOLUTE)
853 {
854 ret.absolute = (absolute_t) tmp_unsigned;
855 }
856 else
857 {
858 ERROR ("snmp plugin: csnmp_value_list_to_value: Unknown data source "
859 "type: %i.", type);
860 ret.gauge = NAN;
861 }
863 return (ret);
864 } /* value_t csnmp_value_list_to_value */
866 /* Returns true if all OIDs have left their subtree */
867 static int csnmp_check_res_left_subtree (const host_definition_t *host,
868 const data_definition_t *data,
869 struct snmp_pdu *res)
870 {
871 struct variable_list *vb;
872 int num_checked;
873 int num_left_subtree;
874 int i;
876 vb = res->variables;
877 if (vb == NULL)
878 return (-1);
880 num_checked = 0;
881 num_left_subtree = 0;
883 /* check all the variables and count how many have left their subtree */
884 for (vb = res->variables, i = 0;
885 (vb != NULL) && (i < data->values_len);
886 vb = vb->next_variable, i++)
887 {
888 num_checked++;
890 if ((vb->type == SNMP_ENDOFMIBVIEW)
891 || (snmp_oid_ncompare (data->values[i].oid,
892 data->values[i].oid_len,
893 vb->name, vb->name_length,
894 data->values[i].oid_len) != 0))
895 num_left_subtree++;
896 }
898 /* check if enough variables have been returned */
899 if (i < data->values_len)
900 {
901 ERROR ("snmp plugin: host %s: Expected %i variables, but got only %i",
902 host->name, data->values_len, i);
903 return (-1);
904 }
906 if (data->instance.oid.oid_len > 0)
907 {
908 if (vb == NULL)
909 {
910 ERROR ("snmp plugin: host %s: Expected one more variable for "
911 "the instance..", host->name);
912 return (-1);
913 }
915 num_checked++;
916 if (snmp_oid_ncompare (data->instance.oid.oid,
917 data->instance.oid.oid_len,
918 vb->name, vb->name_length,
919 data->instance.oid.oid_len) != 0)
920 num_left_subtree++;
921 }
923 DEBUG ("snmp plugin: csnmp_check_res_left_subtree: %i of %i variables have "
924 "left their subtree",
925 num_left_subtree, num_checked);
926 if (num_left_subtree >= num_checked)
927 return (1);
928 return (0);
929 } /* int csnmp_check_res_left_subtree */
931 static int csnmp_strvbcopy_hexstring (char *dst, /* {{{ */
932 const struct variable_list *vb, size_t dst_size)
933 {
934 char *buffer_ptr;
935 size_t buffer_free;
936 size_t i;
938 buffer_ptr = dst;
939 buffer_free = dst_size;
941 for (i = 0; i < vb->val_len; i++)
942 {
943 int status;
945 status = snprintf (buffer_ptr, buffer_free,
946 (i == 0) ? "%02x" : ":%02x", (unsigned int) vb->val.bitstring[i]);
948 if (status >= buffer_free)
949 {
950 buffer_ptr += (buffer_free - 1);
951 *buffer_ptr = 0;
952 return (dst_size + (buffer_free - status));
953 }
954 else /* if (status < buffer_free) */
955 {
956 buffer_ptr += status;
957 buffer_free -= status;
958 }
959 }
961 return ((int) (dst_size - buffer_free));
962 } /* }}} int csnmp_strvbcopy_hexstring */
964 static int csnmp_strvbcopy (char *dst, /* {{{ */
965 const struct variable_list *vb, size_t dst_size)
966 {
967 char *src;
968 size_t num_chars;
969 size_t i;
971 if (vb->type == ASN_OCTET_STR)
972 src = (char *) vb->val.string;
973 else if (vb->type == ASN_BIT_STR)
974 src = (char *) vb->val.bitstring;
975 else
976 {
977 dst[0] = 0;
978 return (EINVAL);
979 }
981 num_chars = dst_size - 1;
982 if (num_chars > vb->val_len)
983 num_chars = vb->val_len;
985 for (i = 0; i < num_chars; i++)
986 {
987 /* Check for control characters. */
988 if ((unsigned char)src[i] < 32)
989 return (csnmp_strvbcopy_hexstring (dst, vb, dst_size));
990 dst[i] = src[i];
991 }
992 dst[num_chars] = 0;
994 return ((int) vb->val_len);
995 } /* }}} int csnmp_strvbcopy */
997 static int csnmp_instance_list_add (csnmp_list_instances_t **head,
998 csnmp_list_instances_t **tail,
999 const struct snmp_pdu *res)
1000 {
1001 csnmp_list_instances_t *il;
1002 struct variable_list *vb;
1004 /* Set vb on the last variable */
1005 for (vb = res->variables;
1006 (vb != NULL) && (vb->next_variable != NULL);
1007 vb = vb->next_variable)
1008 /* do nothing */;
1009 if (vb == NULL)
1010 return (-1);
1012 il = malloc (sizeof (*il));
1013 if (il == NULL)
1014 {
1015 ERROR ("snmp plugin: malloc failed.");
1016 return (-1);
1017 }
1018 /* XXX copy entire OID */
1019 il->subid = vb->name[vb->name_length - 1];
1020 il->next = NULL;
1022 /* Get instance name */
1023 if ((vb->type == ASN_OCTET_STR) || (vb->type == ASN_BIT_STR))
1024 {
1025 char *ptr;
1027 csnmp_strvbcopy (il->instance, vb, sizeof (il->instance));
1029 for (ptr = il->instance; *ptr != '\0'; ptr++)
1030 {
1031 if ((*ptr > 0) && (*ptr < 32))
1032 *ptr = ' ';
1033 else if (*ptr == '/')
1034 *ptr = '_';
1035 }
1036 DEBUG ("snmp plugin: il->instance = `%s';", il->instance);
1037 }
1038 else
1039 {
1040 value_t val = csnmp_value_list_to_value (vb, DS_TYPE_COUNTER, 1.0, 0.0);
1041 ssnprintf (il->instance, sizeof (il->instance),
1042 "%llu", val.counter);
1043 }
1045 /* TODO: Debugging output */
1047 if (*head == NULL)
1048 *head = il;
1049 else
1050 (*tail)->next = il;
1051 *tail = il;
1053 return (0);
1054 } /* int csnmp_instance_list_add */
1056 static int csnmp_dispatch_table (host_definition_t *host, data_definition_t *data,
1057 csnmp_list_instances_t *instance_list,
1058 csnmp_table_values_t **value_table)
1059 {
1060 const data_set_t *ds;
1061 value_list_t vl = VALUE_LIST_INIT;
1063 csnmp_list_instances_t *instance_list_ptr;
1064 csnmp_table_values_t **value_table_ptr;
1066 int i;
1067 oid subid;
1068 int have_more;
1070 ds = plugin_get_ds (data->type);
1071 if (!ds)
1072 {
1073 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
1074 return (-1);
1075 }
1076 assert (ds->ds_num == data->values_len);
1078 instance_list_ptr = instance_list;
1080 value_table_ptr = (csnmp_table_values_t **) malloc (sizeof (csnmp_table_values_t *)
1081 * data->values_len);
1082 if (value_table_ptr == NULL)
1083 return (-1);
1084 for (i = 0; i < data->values_len; i++)
1085 value_table_ptr[i] = value_table[i];
1087 vl.values_len = ds->ds_num;
1088 vl.values = (value_t *) malloc (sizeof (value_t) * vl.values_len);
1089 if (vl.values == NULL)
1090 {
1091 ERROR ("snmp plugin: malloc failed.");
1092 sfree (value_table_ptr);
1093 return (-1);
1094 }
1096 sstrncpy (vl.host, host->name, sizeof (vl.host));
1097 sstrncpy (vl.plugin, "snmp", sizeof (vl.plugin));
1099 vl.interval = host->interval;
1101 subid = 0;
1102 have_more = 1;
1104 while (have_more != 0)
1105 {
1106 if (instance_list != NULL)
1107 {
1108 while ((instance_list_ptr != NULL)
1109 && (instance_list_ptr->subid < subid))
1110 instance_list_ptr = instance_list_ptr->next;
1112 if (instance_list_ptr == NULL)
1113 {
1114 have_more = 0;
1115 continue;
1116 }
1117 else if (instance_list_ptr->subid > subid)
1118 {
1119 subid = instance_list_ptr->subid;
1120 continue;
1121 }
1122 } /* if (instance_list != NULL) */
1124 for (i = 0; i < data->values_len; i++)
1125 {
1126 while ((value_table_ptr[i] != NULL)
1127 && (value_table_ptr[i]->subid < subid))
1128 value_table_ptr[i] = value_table_ptr[i]->next;
1130 if (value_table_ptr[i] == NULL)
1131 {
1132 have_more = 0;
1133 break;
1134 }
1135 else if (value_table_ptr[i]->subid > subid)
1136 {
1137 subid = value_table_ptr[i]->subid;
1138 break;
1139 }
1140 } /* for (i = 0; i < columns; i++) */
1141 /* The subid has been increased - start scanning from the beginning
1142 * again.. */
1143 if (i < data->values_len)
1144 continue;
1146 /* if we reach this line, all value_table_ptr[i] are non-NULL and are set
1147 * to the same subid. instance_list_ptr is either NULL or points to the
1148 * same subid, too. */
1149 #if COLLECT_DEBUG
1150 for (i = 1; i < data->values_len; i++)
1151 {
1152 assert (value_table_ptr[i] != NULL);
1153 assert (value_table_ptr[i-1]->subid == value_table_ptr[i]->subid);
1154 }
1155 assert ((instance_list_ptr == NULL)
1156 || (instance_list_ptr->subid == value_table_ptr[0]->subid));
1157 #endif
1159 sstrncpy (vl.type, data->type, sizeof (vl.type));
1161 {
1162 char temp[DATA_MAX_NAME_LEN];
1164 if (instance_list_ptr == NULL)
1165 ssnprintf (temp, sizeof (temp), "%"PRIu32, (uint32_t) subid);
1166 else
1167 sstrncpy (temp, instance_list_ptr->instance, sizeof (temp));
1169 if (data->instance_prefix == NULL)
1170 sstrncpy (vl.type_instance, temp, sizeof (vl.type_instance));
1171 else
1172 ssnprintf (vl.type_instance, sizeof (vl.type_instance), "%s%s",
1173 data->instance_prefix, temp);
1174 }
1176 for (i = 0; i < data->values_len; i++)
1177 vl.values[i] = value_table_ptr[i]->value;
1179 /* If we get here `vl.type_instance' and all `vl.values' have been set */
1180 plugin_dispatch_values (&vl);
1182 subid++;
1183 } /* while (have_more != 0) */
1185 sfree (vl.values);
1186 sfree (value_table_ptr);
1188 return (0);
1189 } /* int csnmp_dispatch_table */
1191 static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
1192 {
1193 struct snmp_pdu *req;
1194 struct snmp_pdu *res;
1195 struct variable_list *vb;
1197 const data_set_t *ds;
1198 oid_t *oid_list;
1199 uint32_t oid_list_len;
1201 int status;
1202 int i;
1204 /* `value_list_head' and `value_list_tail' implement a linked list for each
1205 * value. `instance_list_head' and `instance_list_tail' implement a linked list of
1206 * instance names. This is used to jump gaps in the table. */
1207 csnmp_list_instances_t *instance_list_head;
1208 csnmp_list_instances_t *instance_list_tail;
1209 csnmp_table_values_t **value_list_head;
1210 csnmp_table_values_t **value_list_tail;
1212 DEBUG ("snmp plugin: csnmp_read_table (host = %s, data = %s)",
1213 host->name, data->name);
1215 if (host->sess_handle == NULL)
1216 {
1217 DEBUG ("snmp plugin: csnmp_read_table: host->sess_handle == NULL");
1218 return (-1);
1219 }
1221 ds = plugin_get_ds (data->type);
1222 if (!ds)
1223 {
1224 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
1225 return (-1);
1226 }
1228 if (ds->ds_num != data->values_len)
1229 {
1230 ERROR ("snmp plugin: DataSet `%s' requires %i values, but config talks about %i",
1231 data->type, ds->ds_num, data->values_len);
1232 return (-1);
1233 }
1235 /* We need a copy of all the OIDs, because GETNEXT will destroy them. */
1236 oid_list_len = data->values_len + 1;
1237 oid_list = (oid_t *) malloc (sizeof (oid_t) * (oid_list_len));
1238 if (oid_list == NULL)
1239 {
1240 ERROR ("snmp plugin: csnmp_read_table: malloc failed.");
1241 return (-1);
1242 }
1243 memcpy (oid_list, data->values, data->values_len * sizeof (oid_t));
1244 if (data->instance.oid.oid_len > 0)
1245 memcpy (oid_list + data->values_len, &data->instance.oid, sizeof (oid_t));
1246 else
1247 oid_list_len--;
1249 /* We're going to construct n linked lists, one for each "value".
1250 * value_list_head will contain pointers to the heads of these linked lists,
1251 * value_list_tail will contain pointers to the tail of the lists. */
1252 value_list_head = calloc (data->values_len, sizeof (*value_list_head));
1253 value_list_tail = calloc (data->values_len, sizeof (*value_list_tail));
1254 if ((value_list_head == NULL) || (value_list_tail == NULL))
1255 {
1256 ERROR ("snmp plugin: csnmp_read_table: calloc failed.");
1257 sfree (oid_list);
1258 sfree (value_list_head);
1259 sfree (value_list_tail);
1260 return (-1);
1261 }
1263 instance_list_head = NULL;
1264 instance_list_tail = NULL;
1266 status = 0;
1267 while (status == 0)
1268 {
1269 req = snmp_pdu_create (SNMP_MSG_GETNEXT);
1270 if (req == NULL)
1271 {
1272 ERROR ("snmp plugin: snmp_pdu_create failed.");
1273 status = -1;
1274 break;
1275 }
1277 for (i = 0; (uint32_t) i < oid_list_len; i++)
1278 snmp_add_null_var (req, oid_list[i].oid, oid_list[i].oid_len);
1280 res = NULL;
1281 status = snmp_sess_synch_response (host->sess_handle, req, &res);
1283 if ((status != STAT_SUCCESS) || (res == NULL))
1284 {
1285 char *errstr = NULL;
1287 snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
1289 c_complain (LOG_ERR, &host->complaint,
1290 "snmp plugin: host %s: snmp_sess_synch_response failed: %s",
1291 host->name, (errstr == NULL) ? "Unknown problem" : errstr);
1293 if (res != NULL)
1294 snmp_free_pdu (res);
1295 res = NULL;
1297 sfree (errstr);
1298 csnmp_host_close_session (host);
1300 status = -1;
1301 break;
1302 }
1303 status = 0;
1304 assert (res != NULL);
1305 c_release (LOG_INFO, &host->complaint,
1306 "snmp plugin: host %s: snmp_sess_synch_response successful.",
1307 host->name);
1309 vb = res->variables;
1310 if (vb == NULL)
1311 {
1312 status = -1;
1313 break;
1314 }
1316 /* Check if all values (and possibly the instance) have left their
1317 * subtree */
1318 if (csnmp_check_res_left_subtree (host, data, res) != 0)
1319 {
1320 status = 0;
1321 break;
1322 }
1324 /* Copy the OID of the value used as instance to oid_list, if an instance
1325 * is configured. */
1326 if (data->instance.oid.oid_len > 0)
1327 {
1328 /* Allocate a new `csnmp_list_instances_t', insert the instance name and
1329 * add it to the list */
1330 if (csnmp_instance_list_add (&instance_list_head, &instance_list_tail,
1331 res) != 0)
1332 {
1333 ERROR ("snmp plugin: csnmp_instance_list_add failed.");
1334 status = -1;
1335 break;
1336 }
1338 /* The instance OID is added to the list of OIDs to GET from the
1339 * snmp agent last, so set vb on the last variable returned and copy
1340 * that OID. */
1341 for (vb = res->variables;
1342 (vb != NULL) && (vb->next_variable != NULL);
1343 vb = vb->next_variable)
1344 /* do nothing */;
1345 assert (vb != NULL);
1347 /* Copy the OID of the instance value to oid_list[data->values_len] */
1348 memcpy (oid_list[data->values_len].oid, vb->name,
1349 sizeof (oid) * vb->name_length);
1350 oid_list[data->values_len].oid_len = vb->name_length;
1351 }
1353 /* Iterate over all the (non-instance) values returned by the agent. The
1354 * (i < value_len) check will make sure we're not handling the instance OID
1355 * twice. */
1356 for (vb = res->variables, i = 0;
1357 (vb != NULL) && (i < data->values_len);
1358 vb = vb->next_variable, i++)
1359 {
1360 csnmp_table_values_t *vt;
1362 /* Check if we left the subtree */
1363 if (snmp_oid_ncompare (data->values[i].oid,
1364 data->values[i].oid_len,
1365 vb->name, vb->name_length,
1366 data->values[i].oid_len) != 0)
1367 {
1368 DEBUG ("snmp plugin: host = %s; data = %s; Value %i left its subtree.",
1369 host->name, data->name, i);
1370 continue;
1371 }
1373 if ((value_list_tail[i] != NULL)
1374 && (vb->name[vb->name_length - 1] <= value_list_tail[i]->subid))
1375 {
1376 DEBUG ("snmp plugin: host = %s; data = %s; i = %i; "
1377 "SUBID is not increasing.",
1378 host->name, data->name, i);
1379 continue;
1380 }
1382 vt = (csnmp_table_values_t *) malloc (sizeof (csnmp_table_values_t));
1383 if (vt == NULL)
1384 {
1385 ERROR ("snmp plugin: malloc failed.");
1386 status = -1;
1387 break;
1388 }
1390 vt->subid = vb->name[vb->name_length - 1];
1391 vt->value = csnmp_value_list_to_value (vb, ds->ds[i].type,
1392 data->scale, data->shift);
1393 vt->next = NULL;
1395 if (value_list_tail[i] == NULL)
1396 value_list_head[i] = vt;
1397 else
1398 value_list_tail[i]->next = vt;
1399 value_list_tail[i] = vt;
1401 /* Copy OID to oid_list[i + 1] */
1402 memcpy (oid_list[i].oid, vb->name, sizeof (oid) * vb->name_length);
1403 oid_list[i].oid_len = vb->name_length;
1404 } /* for (i = data->values_len) */
1406 if (res != NULL)
1407 snmp_free_pdu (res);
1408 res = NULL;
1409 } /* while (status == 0) */
1411 if (res != NULL)
1412 snmp_free_pdu (res);
1413 res = NULL;
1415 if (status == 0)
1416 csnmp_dispatch_table (host, data, instance_list_head, value_list_head);
1418 /* Free all allocated variables here */
1419 while (instance_list_head != NULL)
1420 {
1421 csnmp_list_instances_t *next = instance_list_head->next;
1422 sfree (instance_list_head);
1423 instance_list_head = next;
1424 }
1426 for (i = 0; i < data->values_len; i++)
1427 {
1428 while (value_list_head[i] != NULL)
1429 {
1430 csnmp_table_values_t *next = value_list_head[i]->next;
1431 sfree (value_list_head[i]);
1432 value_list_head[i] = next;
1433 }
1434 }
1436 sfree (value_list_head);
1437 sfree (value_list_tail);
1438 sfree (oid_list);
1440 return (0);
1441 } /* int csnmp_read_table */
1443 static int csnmp_read_value (host_definition_t *host, data_definition_t *data)
1444 {
1445 struct snmp_pdu *req;
1446 struct snmp_pdu *res;
1447 struct variable_list *vb;
1449 const data_set_t *ds;
1450 value_list_t vl = VALUE_LIST_INIT;
1452 int status;
1453 int i;
1455 DEBUG ("snmp plugin: csnmp_read_value (host = %s, data = %s)",
1456 host->name, data->name);
1458 if (host->sess_handle == NULL)
1459 {
1460 DEBUG ("snmp plugin: csnmp_read_table: host->sess_handle == NULL");
1461 return (-1);
1462 }
1464 ds = plugin_get_ds (data->type);
1465 if (!ds)
1466 {
1467 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
1468 return (-1);
1469 }
1471 if (ds->ds_num != data->values_len)
1472 {
1473 ERROR ("snmp plugin: DataSet `%s' requires %i values, but config talks about %i",
1474 data->type, ds->ds_num, data->values_len);
1475 return (-1);
1476 }
1478 vl.values_len = ds->ds_num;
1479 vl.values = (value_t *) malloc (sizeof (value_t) * vl.values_len);
1480 if (vl.values == NULL)
1481 return (-1);
1482 for (i = 0; i < vl.values_len; i++)
1483 {
1484 if (ds->ds[i].type == DS_TYPE_COUNTER)
1485 vl.values[i].counter = 0;
1486 else
1487 vl.values[i].gauge = NAN;
1488 }
1490 sstrncpy (vl.host, host->name, sizeof (vl.host));
1491 sstrncpy (vl.plugin, "snmp", sizeof (vl.plugin));
1492 sstrncpy (vl.type, data->type, sizeof (vl.type));
1493 sstrncpy (vl.type_instance, data->instance.string, sizeof (vl.type_instance));
1495 vl.interval = host->interval;
1497 req = snmp_pdu_create (SNMP_MSG_GET);
1498 if (req == NULL)
1499 {
1500 ERROR ("snmp plugin: snmp_pdu_create failed.");
1501 sfree (vl.values);
1502 return (-1);
1503 }
1505 for (i = 0; i < data->values_len; i++)
1506 snmp_add_null_var (req, data->values[i].oid, data->values[i].oid_len);
1508 res = NULL;
1509 status = snmp_sess_synch_response (host->sess_handle, req, &res);
1511 if ((status != STAT_SUCCESS) || (res == NULL))
1512 {
1513 char *errstr = NULL;
1515 snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
1516 ERROR ("snmp plugin: host %s: snmp_sess_synch_response failed: %s",
1517 host->name, (errstr == NULL) ? "Unknown problem" : errstr);
1519 if (res != NULL)
1520 snmp_free_pdu (res);
1521 res = NULL;
1523 sfree (errstr);
1524 csnmp_host_close_session (host);
1526 return (-1);
1527 }
1530 for (vb = res->variables; vb != NULL; vb = vb->next_variable)
1531 {
1532 #if COLLECT_DEBUG
1533 char buffer[1024];
1534 snprint_variable (buffer, sizeof (buffer),
1535 vb->name, vb->name_length, vb);
1536 DEBUG ("snmp plugin: Got this variable: %s", buffer);
1537 #endif /* COLLECT_DEBUG */
1539 for (i = 0; i < data->values_len; i++)
1540 if (snmp_oid_compare (data->values[i].oid, data->values[i].oid_len,
1541 vb->name, vb->name_length) == 0)
1542 vl.values[i] = csnmp_value_list_to_value (vb, ds->ds[i].type,
1543 data->scale, data->shift);
1544 } /* for (res->variables) */
1546 if (res != NULL)
1547 snmp_free_pdu (res);
1548 res = NULL;
1550 DEBUG ("snmp plugin: -> plugin_dispatch_values (&vl);");
1551 plugin_dispatch_values (&vl);
1552 sfree (vl.values);
1554 return (0);
1555 } /* int csnmp_read_value */
1557 static int csnmp_read_host (user_data_t *ud)
1558 {
1559 host_definition_t *host;
1560 time_t time_start;
1561 time_t time_end;
1562 int status;
1563 int success;
1564 int i;
1566 host = ud->data;
1568 if (host->interval == 0)
1569 host->interval = interval_g;
1571 time_start = time (NULL);
1572 DEBUG ("snmp plugin: csnmp_read_host (%s) started at %u;", host->name,
1573 (unsigned int) time_start);
1575 if (host->sess_handle == NULL)
1576 csnmp_host_open_session (host);
1578 if (host->sess_handle == NULL)
1579 return (-1);
1581 success = 0;
1582 for (i = 0; i < host->data_list_len; i++)
1583 {
1584 data_definition_t *data = host->data_list[i];
1586 if (data->is_table)
1587 status = csnmp_read_table (host, data);
1588 else
1589 status = csnmp_read_value (host, data);
1591 if (status == 0)
1592 success++;
1593 }
1595 time_end = time (NULL);
1596 DEBUG ("snmp plugin: csnmp_read_host (%s) finished at %u;", host->name,
1597 (unsigned int) time_end);
1598 if ((uint32_t) (time_end - time_start) > host->interval)
1599 {
1600 WARNING ("snmp plugin: Host `%s' should be queried every %"PRIu32
1601 " seconds, but reading all values takes %u seconds.",
1602 host->name, host->interval, (unsigned int) (time_end - time_start));
1603 }
1605 if (success == 0)
1606 return (-1);
1608 return (0);
1609 } /* int csnmp_read_host */
1611 static int csnmp_init (void)
1612 {
1613 call_snmp_init_once ();
1615 return (0);
1616 } /* int csnmp_init */
1618 static int csnmp_shutdown (void)
1619 {
1620 data_definition_t *data_this;
1621 data_definition_t *data_next;
1623 /* When we get here, the read threads have been stopped and all the
1624 * `host_definition_t' will be freed. */
1625 DEBUG ("snmp plugin: Destroying all data definitions.");
1627 data_this = data_head;
1628 data_head = NULL;
1629 while (data_this != NULL)
1630 {
1631 data_next = data_this->next;
1633 sfree (data_this->name);
1634 sfree (data_this->type);
1635 sfree (data_this->values);
1636 sfree (data_this);
1638 data_this = data_next;
1639 }
1641 return (0);
1642 } /* int csnmp_shutdown */
1644 void module_register (void)
1645 {
1646 plugin_register_complex_config ("snmp", csnmp_config);
1647 plugin_register_init ("snmp", csnmp_init);
1648 plugin_register_shutdown ("snmp", csnmp_shutdown);
1649 } /* void module_register */
1651 /*
1652 * vim: shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker
1653 */