1 /**
2 * collectd - src/snmp.c
3 * Copyright (C) 2007-2012 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 collectd.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 cdtime_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_t suffix;
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_t suffix;
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_oid_init (oid_t *dst, oid const *src, size_t n)
110 {
111 assert (n <= STATIC_ARRAY_SIZE (dst->oid));
112 memcpy (dst->oid, src, sizeof (*src) * n);
113 dst->oid_len = n;
114 }
116 static int csnmp_oid_compare (oid_t const *left, oid_t const *right)
117 {
118 return (snmp_oid_compare (left->oid, left->oid_len,
119 right->oid, right->oid_len));
120 }
122 static int csnmp_oid_suffix (oid_t *dst, oid_t const *src,
123 oid_t const *root)
124 {
125 /* Make sure "src" is in "root"s subtree. */
126 if (src->oid_len <= root->oid_len)
127 return (EINVAL);
128 if (snmp_oid_ncompare (root->oid, root->oid_len,
129 src->oid, src->oid_len,
130 /* n = */ root->oid_len) != 0)
131 return (EINVAL);
133 memset (dst, 0, sizeof (*dst));
134 dst->oid_len = src->oid_len - root->oid_len;
135 memcpy (dst->oid, &src->oid[root->oid_len],
136 dst->oid_len * sizeof (dst->oid[0]));
137 return (0);
138 }
140 static int csnmp_oid_to_string (char *buffer, size_t buffer_size,
141 oid_t const *o)
142 {
143 char oid_str[MAX_OID_LEN][16];
144 char *oid_str_ptr[MAX_OID_LEN];
145 size_t i;
147 for (i = 0; i < o->oid_len; i++)
148 {
149 ssnprintf (oid_str[i], sizeof (oid_str[i]), "%lu", (unsigned long) o->oid[i]);
150 oid_str_ptr[i] = oid_str[i];
151 }
153 return (strjoin (buffer, buffer_size,
154 oid_str_ptr, o->oid_len, /* separator = */ "."));
155 }
157 static void csnmp_host_close_session (host_definition_t *host) /* {{{ */
158 {
159 if (host->sess_handle == NULL)
160 return;
162 snmp_sess_close (host->sess_handle);
163 host->sess_handle = NULL;
164 } /* }}} void csnmp_host_close_session */
166 static void csnmp_host_definition_destroy (void *arg) /* {{{ */
167 {
168 host_definition_t *hd;
170 hd = arg;
172 if (hd == NULL)
173 return;
175 if (hd->name != NULL)
176 {
177 DEBUG ("snmp plugin: Destroying host definition for host `%s'.",
178 hd->name);
179 }
181 csnmp_host_close_session (hd);
183 sfree (hd->name);
184 sfree (hd->address);
185 sfree (hd->community);
186 sfree (hd->data_list);
188 sfree (hd);
189 } /* }}} void csnmp_host_definition_destroy */
191 /* Many functions to handle the configuration. {{{ */
192 /* First there are many functions which do configuration stuff. It's a big
193 * bloated and messy, I'm afraid. */
195 /*
196 * Callgraph for the config stuff:
197 * csnmp_config
198 * +-> call_snmp_init_once
199 * +-> csnmp_config_add_data
200 * ! +-> csnmp_config_add_data_type
201 * ! +-> csnmp_config_add_data_table
202 * ! +-> csnmp_config_add_data_instance
203 * ! +-> csnmp_config_add_data_instance_prefix
204 * ! +-> csnmp_config_add_data_values
205 * +-> csnmp_config_add_host
206 * +-> csnmp_config_add_host_address
207 * +-> csnmp_config_add_host_community
208 * +-> csnmp_config_add_host_version
209 * +-> csnmp_config_add_host_collect
210 */
211 static void call_snmp_init_once (void)
212 {
213 static int have_init = 0;
215 if (have_init == 0)
216 init_snmp (PACKAGE_NAME);
217 have_init = 1;
218 } /* void call_snmp_init_once */
220 static int csnmp_config_add_data_type (data_definition_t *dd, oconfig_item_t *ci)
221 {
222 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
223 {
224 WARNING ("snmp plugin: `Type' needs exactly one string argument.");
225 return (-1);
226 }
228 sfree (dd->type);
229 dd->type = strdup (ci->values[0].value.string);
230 if (dd->type == NULL)
231 return (-1);
233 return (0);
234 } /* int csnmp_config_add_data_type */
236 static int csnmp_config_add_data_table (data_definition_t *dd, oconfig_item_t *ci)
237 {
238 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_BOOLEAN))
239 {
240 WARNING ("snmp plugin: `Table' needs exactly one boolean argument.");
241 return (-1);
242 }
244 dd->is_table = ci->values[0].value.boolean ? 1 : 0;
246 return (0);
247 } /* int csnmp_config_add_data_table */
249 static int csnmp_config_add_data_instance (data_definition_t *dd, oconfig_item_t *ci)
250 {
251 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
252 {
253 WARNING ("snmp plugin: `Instance' needs exactly one string argument.");
254 return (-1);
255 }
257 if (dd->is_table)
258 {
259 /* Instance is an OID */
260 dd->instance.oid.oid_len = MAX_OID_LEN;
262 if (!read_objid (ci->values[0].value.string,
263 dd->instance.oid.oid, &dd->instance.oid.oid_len))
264 {
265 ERROR ("snmp plugin: read_objid (%s) failed.",
266 ci->values[0].value.string);
267 return (-1);
268 }
269 }
270 else
271 {
272 /* Instance is a simple string */
273 sstrncpy (dd->instance.string, ci->values[0].value.string,
274 sizeof (dd->instance.string));
275 }
277 return (0);
278 } /* int csnmp_config_add_data_instance */
280 static int csnmp_config_add_data_instance_prefix (data_definition_t *dd,
281 oconfig_item_t *ci)
282 {
283 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
284 {
285 WARNING ("snmp plugin: `InstancePrefix' needs exactly one string argument.");
286 return (-1);
287 }
289 if (!dd->is_table)
290 {
291 WARNING ("snmp plugin: data %s: InstancePrefix is ignored when `Table' "
292 "is set to `false'.", dd->name);
293 return (-1);
294 }
296 sfree (dd->instance_prefix);
297 dd->instance_prefix = strdup (ci->values[0].value.string);
298 if (dd->instance_prefix == NULL)
299 return (-1);
301 return (0);
302 } /* int csnmp_config_add_data_instance_prefix */
304 static int csnmp_config_add_data_values (data_definition_t *dd, oconfig_item_t *ci)
305 {
306 int i;
308 if (ci->values_num < 1)
309 {
310 WARNING ("snmp plugin: `Values' needs at least one argument.");
311 return (-1);
312 }
314 for (i = 0; i < ci->values_num; i++)
315 if (ci->values[i].type != OCONFIG_TYPE_STRING)
316 {
317 WARNING ("snmp plugin: `Values' needs only string argument.");
318 return (-1);
319 }
321 sfree (dd->values);
322 dd->values_len = 0;
323 dd->values = (oid_t *) malloc (sizeof (oid_t) * ci->values_num);
324 if (dd->values == NULL)
325 return (-1);
326 dd->values_len = ci->values_num;
328 for (i = 0; i < ci->values_num; i++)
329 {
330 dd->values[i].oid_len = MAX_OID_LEN;
332 if (NULL == snmp_parse_oid (ci->values[i].value.string,
333 dd->values[i].oid, &dd->values[i].oid_len))
334 {
335 ERROR ("snmp plugin: snmp_parse_oid (%s) failed.",
336 ci->values[i].value.string);
337 free (dd->values);
338 dd->values = NULL;
339 dd->values_len = 0;
340 return (-1);
341 }
342 }
344 return (0);
345 } /* int csnmp_config_add_data_instance */
347 static int csnmp_config_add_data_shift (data_definition_t *dd, oconfig_item_t *ci)
348 {
349 if ((ci->values_num != 1)
350 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
351 {
352 WARNING ("snmp plugin: The `Shift' config option needs exactly one number argument.");
353 return (-1);
354 }
356 dd->shift = ci->values[0].value.number;
358 return (0);
359 } /* int csnmp_config_add_data_shift */
361 static int csnmp_config_add_data_scale (data_definition_t *dd, oconfig_item_t *ci)
362 {
363 if ((ci->values_num != 1)
364 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
365 {
366 WARNING ("snmp plugin: The `Scale' config option needs exactly one number argument.");
367 return (-1);
368 }
370 dd->scale = ci->values[0].value.number;
372 return (0);
373 } /* int csnmp_config_add_data_scale */
375 static int csnmp_config_add_data (oconfig_item_t *ci)
376 {
377 data_definition_t *dd;
378 int status = 0;
379 int i;
381 if ((ci->values_num != 1)
382 || (ci->values[0].type != OCONFIG_TYPE_STRING))
383 {
384 WARNING ("snmp plugin: The `Data' config option needs exactly one string argument.");
385 return (-1);
386 }
388 dd = (data_definition_t *) malloc (sizeof (data_definition_t));
389 if (dd == NULL)
390 return (-1);
391 memset (dd, '\0', sizeof (data_definition_t));
393 dd->name = strdup (ci->values[0].value.string);
394 if (dd->name == NULL)
395 {
396 free (dd);
397 return (-1);
398 }
399 dd->scale = 1.0;
400 dd->shift = 0.0;
402 for (i = 0; i < ci->children_num; i++)
403 {
404 oconfig_item_t *option = ci->children + i;
405 status = 0;
407 if (strcasecmp ("Type", option->key) == 0)
408 status = csnmp_config_add_data_type (dd, option);
409 else if (strcasecmp ("Table", option->key) == 0)
410 status = csnmp_config_add_data_table (dd, option);
411 else if (strcasecmp ("Instance", option->key) == 0)
412 status = csnmp_config_add_data_instance (dd, option);
413 else if (strcasecmp ("InstancePrefix", option->key) == 0)
414 status = csnmp_config_add_data_instance_prefix (dd, option);
415 else if (strcasecmp ("Values", option->key) == 0)
416 status = csnmp_config_add_data_values (dd, option);
417 else if (strcasecmp ("Shift", option->key) == 0)
418 status = csnmp_config_add_data_shift (dd, option);
419 else if (strcasecmp ("Scale", option->key) == 0)
420 status = csnmp_config_add_data_scale (dd, option);
421 else
422 {
423 WARNING ("snmp plugin: Option `%s' not allowed here.", option->key);
424 status = -1;
425 }
427 if (status != 0)
428 break;
429 } /* for (ci->children) */
431 while (status == 0)
432 {
433 if (dd->type == NULL)
434 {
435 WARNING ("snmp plugin: `Type' not given for data `%s'", dd->name);
436 status = -1;
437 break;
438 }
439 if (dd->values == NULL)
440 {
441 WARNING ("snmp plugin: No `Value' given for data `%s'", dd->name);
442 status = -1;
443 break;
444 }
446 break;
447 } /* while (status == 0) */
449 if (status != 0)
450 {
451 sfree (dd->name);
452 sfree (dd->instance_prefix);
453 sfree (dd->values);
454 sfree (dd);
455 return (-1);
456 }
458 DEBUG ("snmp plugin: dd = { name = %s, type = %s, is_table = %s, values_len = %i }",
459 dd->name, dd->type, (dd->is_table != 0) ? "true" : "false", dd->values_len);
461 if (data_head == NULL)
462 data_head = dd;
463 else
464 {
465 data_definition_t *last;
466 last = data_head;
467 while (last->next != NULL)
468 last = last->next;
469 last->next = dd;
470 }
472 return (0);
473 } /* int csnmp_config_add_data */
475 static int csnmp_config_add_host_address (host_definition_t *hd, oconfig_item_t *ci)
476 {
477 if ((ci->values_num != 1)
478 || (ci->values[0].type != OCONFIG_TYPE_STRING))
479 {
480 WARNING ("snmp plugin: The `Address' config option needs exactly one string argument.");
481 return (-1);
482 }
484 if (hd->address == NULL)
485 free (hd->address);
487 hd->address = strdup (ci->values[0].value.string);
488 if (hd->address == NULL)
489 return (-1);
491 DEBUG ("snmp plugin: host = %s; host->address = %s;",
492 hd->name, hd->address);
494 return (0);
495 } /* int csnmp_config_add_host_address */
497 static int csnmp_config_add_host_community (host_definition_t *hd, oconfig_item_t *ci)
498 {
499 if ((ci->values_num != 1)
500 || (ci->values[0].type != OCONFIG_TYPE_STRING))
501 {
502 WARNING ("snmp plugin: The `Community' config option needs exactly one string argument.");
503 return (-1);
504 }
506 if (hd->community == NULL)
507 free (hd->community);
509 hd->community = strdup (ci->values[0].value.string);
510 if (hd->community == NULL)
511 return (-1);
513 DEBUG ("snmp plugin: host = %s; host->community = %s;",
514 hd->name, hd->community);
516 return (0);
517 } /* int csnmp_config_add_host_community */
519 static int csnmp_config_add_host_version (host_definition_t *hd, oconfig_item_t *ci)
520 {
521 int version;
523 if ((ci->values_num != 1)
524 || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
525 {
526 WARNING ("snmp plugin: The `Version' config option needs exactly one number argument.");
527 return (-1);
528 }
530 version = (int) ci->values[0].value.number;
531 if ((version != 1) && (version != 2))
532 {
533 WARNING ("snmp plugin: `Version' must either be `1' or `2'.");
534 return (-1);
535 }
537 hd->version = version;
539 return (0);
540 } /* int csnmp_config_add_host_address */
542 static int csnmp_config_add_host_collect (host_definition_t *host,
543 oconfig_item_t *ci)
544 {
545 data_definition_t *data;
546 data_definition_t **data_list;
547 int data_list_len;
548 int i;
550 if (ci->values_num < 1)
551 {
552 WARNING ("snmp plugin: `Collect' needs at least one argument.");
553 return (-1);
554 }
556 for (i = 0; i < ci->values_num; i++)
557 if (ci->values[i].type != OCONFIG_TYPE_STRING)
558 {
559 WARNING ("snmp plugin: All arguments to `Collect' must be strings.");
560 return (-1);
561 }
563 data_list_len = host->data_list_len + ci->values_num;
564 data_list = (data_definition_t **) realloc (host->data_list,
565 sizeof (data_definition_t *) * data_list_len);
566 if (data_list == NULL)
567 return (-1);
568 host->data_list = data_list;
570 for (i = 0; i < ci->values_num; i++)
571 {
572 for (data = data_head; data != NULL; data = data->next)
573 if (strcasecmp (ci->values[i].value.string, data->name) == 0)
574 break;
576 if (data == NULL)
577 {
578 WARNING ("snmp plugin: No such data configured: `%s'",
579 ci->values[i].value.string);
580 continue;
581 }
583 DEBUG ("snmp plugin: Collect: host = %s, data[%i] = %s;",
584 host->name, host->data_list_len, data->name);
586 host->data_list[host->data_list_len] = data;
587 host->data_list_len++;
588 } /* for (values_num) */
590 return (0);
591 } /* int csnmp_config_add_host_collect */
593 static int csnmp_config_add_host (oconfig_item_t *ci)
594 {
595 host_definition_t *hd;
596 int status = 0;
597 int i;
599 /* Registration stuff. */
600 char cb_name[DATA_MAX_NAME_LEN];
601 user_data_t cb_data;
602 struct timespec cb_interval;
604 if ((ci->values_num != 1) || (ci->values[0].type != OCONFIG_TYPE_STRING))
605 {
606 WARNING ("snmp plugin: `Host' needs exactly one string argument.");
607 return (-1);
608 }
610 hd = (host_definition_t *) malloc (sizeof (host_definition_t));
611 if (hd == NULL)
612 return (-1);
613 memset (hd, '\0', sizeof (host_definition_t));
614 hd->version = 2;
615 C_COMPLAIN_INIT (&hd->complaint);
617 hd->name = strdup (ci->values[0].value.string);
618 if (hd->name == NULL)
619 {
620 free (hd);
621 return (-1);
622 }
624 hd->sess_handle = NULL;
625 hd->interval = 0;
627 for (i = 0; i < ci->children_num; i++)
628 {
629 oconfig_item_t *option = ci->children + i;
630 status = 0;
632 if (strcasecmp ("Address", option->key) == 0)
633 status = csnmp_config_add_host_address (hd, option);
634 else if (strcasecmp ("Community", option->key) == 0)
635 status = csnmp_config_add_host_community (hd, option);
636 else if (strcasecmp ("Version", option->key) == 0)
637 status = csnmp_config_add_host_version (hd, option);
638 else if (strcasecmp ("Collect", option->key) == 0)
639 csnmp_config_add_host_collect (hd, option);
640 else if (strcasecmp ("Interval", option->key) == 0)
641 cf_util_get_cdtime (option, &hd->interval);
642 else
643 {
644 WARNING ("snmp plugin: csnmp_config_add_host: Option `%s' not allowed here.", option->key);
645 status = -1;
646 }
648 if (status != 0)
649 break;
650 } /* for (ci->children) */
652 while (status == 0)
653 {
654 if (hd->address == NULL)
655 {
656 WARNING ("snmp plugin: `Address' not given for host `%s'", hd->name);
657 status = -1;
658 break;
659 }
660 if (hd->community == NULL)
661 {
662 WARNING ("snmp plugin: `Community' not given for host `%s'", hd->name);
663 status = -1;
664 break;
665 }
667 break;
668 } /* while (status == 0) */
670 if (status != 0)
671 {
672 csnmp_host_definition_destroy (hd);
673 return (-1);
674 }
676 DEBUG ("snmp plugin: hd = { name = %s, address = %s, community = %s, version = %i }",
677 hd->name, hd->address, hd->community, hd->version);
679 ssnprintf (cb_name, sizeof (cb_name), "snmp-%s", hd->name);
681 memset (&cb_data, 0, sizeof (cb_data));
682 cb_data.data = hd;
683 cb_data.free_func = csnmp_host_definition_destroy;
685 CDTIME_T_TO_TIMESPEC (hd->interval, &cb_interval);
687 status = plugin_register_complex_read (/* group = */ NULL, cb_name,
688 csnmp_read_host, /* interval = */ &cb_interval,
689 /* user_data = */ &cb_data);
690 if (status != 0)
691 {
692 ERROR ("snmp plugin: Registering complex read function failed.");
693 csnmp_host_definition_destroy (hd);
694 return (-1);
695 }
697 return (0);
698 } /* int csnmp_config_add_host */
700 static int csnmp_config (oconfig_item_t *ci)
701 {
702 int i;
704 call_snmp_init_once ();
706 for (i = 0; i < ci->children_num; i++)
707 {
708 oconfig_item_t *child = ci->children + i;
709 if (strcasecmp ("Data", child->key) == 0)
710 csnmp_config_add_data (child);
711 else if (strcasecmp ("Host", child->key) == 0)
712 csnmp_config_add_host (child);
713 else
714 {
715 WARNING ("snmp plugin: Ignoring unknown config option `%s'.", child->key);
716 }
717 } /* for (ci->children) */
719 return (0);
720 } /* int csnmp_config */
722 /* }}} End of the config stuff. Now the interesting part begins */
724 static void csnmp_host_open_session (host_definition_t *host)
725 {
726 struct snmp_session sess;
728 if (host->sess_handle != NULL)
729 csnmp_host_close_session (host);
731 snmp_sess_init (&sess);
732 sess.peername = host->address;
733 sess.community = (u_char *) host->community;
734 sess.community_len = strlen (host->community);
735 sess.version = (host->version == 1) ? SNMP_VERSION_1 : SNMP_VERSION_2c;
737 /* snmp_sess_open will copy the `struct snmp_session *'. */
738 host->sess_handle = snmp_sess_open (&sess);
740 if (host->sess_handle == NULL)
741 {
742 char *errstr = NULL;
744 snmp_error (&sess, NULL, NULL, &errstr);
746 ERROR ("snmp plugin: host %s: snmp_sess_open failed: %s",
747 host->name, (errstr == NULL) ? "Unknown problem" : errstr);
748 sfree (errstr);
749 }
750 } /* void csnmp_host_open_session */
752 /* TODO: Check if negative values wrap around. Problem: negative temperatures. */
753 static value_t csnmp_value_list_to_value (struct variable_list *vl, int type,
754 double scale, double shift,
755 const char *host_name, const char *data_name)
756 {
757 value_t ret;
758 uint64_t tmp_unsigned = 0;
759 int64_t tmp_signed = 0;
760 _Bool defined = 1;
761 /* Set to true when the original SNMP type appears to have been signed. */
762 _Bool prefer_signed = 0;
764 if ((vl->type == ASN_INTEGER)
765 || (vl->type == ASN_UINTEGER)
766 || (vl->type == ASN_COUNTER)
767 #ifdef ASN_TIMETICKS
768 || (vl->type == ASN_TIMETICKS)
769 #endif
770 || (vl->type == ASN_GAUGE))
771 {
772 tmp_unsigned = (uint32_t) *vl->val.integer;
773 tmp_signed = (int32_t) *vl->val.integer;
775 if ((vl->type == ASN_INTEGER)
776 || (vl->type == ASN_GAUGE))
777 prefer_signed = 1;
779 DEBUG ("snmp plugin: Parsed int32 value is %"PRIu64".", tmp_unsigned);
780 }
781 else if (vl->type == ASN_COUNTER64)
782 {
783 tmp_unsigned = (uint32_t) vl->val.counter64->high;
784 tmp_unsigned = tmp_unsigned << 32;
785 tmp_unsigned += (uint32_t) vl->val.counter64->low;
786 tmp_signed = (int64_t) tmp_unsigned;
787 DEBUG ("snmp plugin: Parsed int64 value is %"PRIu64".", tmp_unsigned);
788 }
789 else if (vl->type == ASN_OCTET_STR)
790 {
791 /* We'll handle this later.. */
792 }
793 else
794 {
795 char oid_buffer[1024];
797 memset (oid_buffer, 0, sizeof (oid_buffer));
798 snprint_objid (oid_buffer, sizeof (oid_buffer) - 1,
799 vl->name, vl->name_length);
801 #ifdef ASN_NULL
802 if (vl->type == ASN_NULL)
803 INFO ("snmp plugin: OID \"%s\" is undefined (type ASN_NULL)",
804 oid_buffer);
805 else
806 #endif
807 WARNING ("snmp plugin: I don't know the ASN type #%i "
808 "(OID: \"%s\", data block \"%s\", host block \"%s\")",
809 (int) vl->type, oid_buffer,
810 (data_name != NULL) ? data_name : "UNKNOWN",
811 (host_name != NULL) ? host_name : "UNKNOWN");
813 defined = 0;
814 }
816 if (vl->type == ASN_OCTET_STR)
817 {
818 int status = -1;
820 if (vl->val.string != NULL)
821 {
822 char string[64];
823 size_t string_length;
825 string_length = sizeof (string) - 1;
826 if (vl->val_len < string_length)
827 string_length = vl->val_len;
829 /* The strings we get from the Net-SNMP library may not be null
830 * terminated. That is why we're using `memcpy' here and not `strcpy'.
831 * `string_length' is set to `vl->val_len' which holds the length of the
832 * string. -octo */
833 memcpy (string, vl->val.string, string_length);
834 string[string_length] = 0;
836 status = parse_value (string, &ret, type);
837 if (status != 0)
838 {
839 ERROR ("snmp plugin: csnmp_value_list_to_value: Parsing string as %s failed: %s",
840 DS_TYPE_TO_STRING (type), string);
841 }
842 }
844 if (status != 0)
845 {
846 switch (type)
847 {
848 case DS_TYPE_COUNTER:
849 case DS_TYPE_DERIVE:
850 case DS_TYPE_ABSOLUTE:
851 memset (&ret, 0, sizeof (ret));
852 break;
854 case DS_TYPE_GAUGE:
855 ret.gauge = NAN;
856 break;
858 default:
859 ERROR ("snmp plugin: csnmp_value_list_to_value: Unknown "
860 "data source type: %i.", type);
861 ret.gauge = NAN;
862 }
863 }
864 } /* if (vl->type == ASN_OCTET_STR) */
865 else if (type == DS_TYPE_COUNTER)
866 {
867 ret.counter = tmp_unsigned;
868 }
869 else if (type == DS_TYPE_GAUGE)
870 {
871 if (!defined)
872 ret.gauge = NAN;
873 else if (prefer_signed)
874 ret.gauge = (scale * tmp_signed) + shift;
875 else
876 ret.gauge = (scale * tmp_unsigned) + shift;
877 }
878 else if (type == DS_TYPE_DERIVE)
879 {
880 if (prefer_signed)
881 ret.derive = (derive_t) tmp_signed;
882 else
883 ret.derive = (derive_t) tmp_unsigned;
884 }
885 else if (type == DS_TYPE_ABSOLUTE)
886 {
887 ret.absolute = (absolute_t) tmp_unsigned;
888 }
889 else
890 {
891 ERROR ("snmp plugin: csnmp_value_list_to_value: Unknown data source "
892 "type: %i.", type);
893 ret.gauge = NAN;
894 }
896 return (ret);
897 } /* value_t csnmp_value_list_to_value */
899 static int csnmp_strvbcopy_hexstring (char *dst, /* {{{ */
900 const struct variable_list *vb, size_t dst_size)
901 {
902 char *buffer_ptr;
903 size_t buffer_free;
904 size_t i;
906 buffer_ptr = dst;
907 buffer_free = dst_size;
909 for (i = 0; i < vb->val_len; i++)
910 {
911 int status;
913 status = snprintf (buffer_ptr, buffer_free,
914 (i == 0) ? "%02x" : ":%02x", (unsigned int) vb->val.bitstring[i]);
916 if (status >= buffer_free)
917 {
918 buffer_ptr += (buffer_free - 1);
919 *buffer_ptr = 0;
920 return (dst_size + (buffer_free - status));
921 }
922 else /* if (status < buffer_free) */
923 {
924 buffer_ptr += status;
925 buffer_free -= status;
926 }
927 }
929 return ((int) (dst_size - buffer_free));
930 } /* }}} int csnmp_strvbcopy_hexstring */
932 static int csnmp_strvbcopy (char *dst, /* {{{ */
933 const struct variable_list *vb, size_t dst_size)
934 {
935 char *src;
936 size_t num_chars;
937 size_t i;
939 if (vb->type == ASN_OCTET_STR)
940 src = (char *) vb->val.string;
941 else if (vb->type == ASN_BIT_STR)
942 src = (char *) vb->val.bitstring;
943 else
944 {
945 dst[0] = 0;
946 return (EINVAL);
947 }
949 num_chars = dst_size - 1;
950 if (num_chars > vb->val_len)
951 num_chars = vb->val_len;
953 for (i = 0; i < num_chars; i++)
954 {
955 /* Check for control characters. */
956 if ((unsigned char)src[i] < 32)
957 return (csnmp_strvbcopy_hexstring (dst, vb, dst_size));
958 dst[i] = src[i];
959 }
960 dst[num_chars] = 0;
962 return ((int) vb->val_len);
963 } /* }}} int csnmp_strvbcopy */
965 static int csnmp_instance_list_add (csnmp_list_instances_t **head,
966 csnmp_list_instances_t **tail,
967 const struct snmp_pdu *res,
968 const host_definition_t *hd, const data_definition_t *dd)
969 {
970 csnmp_list_instances_t *il;
971 struct variable_list *vb;
972 oid_t vb_name;
973 int status;
975 /* Set vb on the last variable */
976 for (vb = res->variables;
977 (vb != NULL) && (vb->next_variable != NULL);
978 vb = vb->next_variable)
979 /* do nothing */;
980 if (vb == NULL)
981 return (-1);
983 csnmp_oid_init (&vb_name, vb->name, vb->name_length);
985 il = malloc (sizeof (*il));
986 if (il == NULL)
987 {
988 ERROR ("snmp plugin: malloc failed.");
989 return (-1);
990 }
991 memset (il, 0, sizeof (*il));
992 il->next = NULL;
994 status = csnmp_oid_suffix (&il->suffix, &vb_name, &dd->instance.oid);
995 if (status != 0)
996 {
997 sfree (il);
998 return (status);
999 }
1001 /* Get instance name */
1002 if ((vb->type == ASN_OCTET_STR) || (vb->type == ASN_BIT_STR))
1003 {
1004 char *ptr;
1006 csnmp_strvbcopy (il->instance, vb, sizeof (il->instance));
1008 for (ptr = il->instance; *ptr != '\0'; ptr++)
1009 {
1010 if ((*ptr > 0) && (*ptr < 32))
1011 *ptr = ' ';
1012 else if (*ptr == '/')
1013 *ptr = '_';
1014 }
1015 DEBUG ("snmp plugin: il->instance = `%s';", il->instance);
1016 }
1017 else
1018 {
1019 value_t val = csnmp_value_list_to_value (vb, DS_TYPE_COUNTER,
1020 /* scale = */ 1.0, /* shift = */ 0.0, hd->name, dd->name);
1021 ssnprintf (il->instance, sizeof (il->instance),
1022 "%llu", val.counter);
1023 }
1025 /* TODO: Debugging output */
1027 if (*head == NULL)
1028 *head = il;
1029 else
1030 (*tail)->next = il;
1031 *tail = il;
1033 return (0);
1034 } /* int csnmp_instance_list_add */
1036 static int csnmp_dispatch_table (host_definition_t *host, data_definition_t *data,
1037 csnmp_list_instances_t *instance_list,
1038 csnmp_table_values_t **value_table)
1039 {
1040 const data_set_t *ds;
1041 value_list_t vl = VALUE_LIST_INIT;
1043 csnmp_list_instances_t *instance_list_ptr;
1044 csnmp_table_values_t **value_table_ptr;
1046 int i;
1047 _Bool have_more;
1048 oid_t current_suffix;
1050 ds = plugin_get_ds (data->type);
1051 if (!ds)
1052 {
1053 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
1054 return (-1);
1055 }
1056 assert (ds->ds_num == data->values_len);
1058 instance_list_ptr = instance_list;
1060 value_table_ptr = malloc (sizeof (*value_table_ptr) * data->values_len);
1061 if (value_table_ptr == NULL)
1062 return (-1);
1063 for (i = 0; i < data->values_len; i++)
1064 value_table_ptr[i] = value_table[i];
1066 vl.values_len = ds->ds_num;
1067 vl.values = malloc (sizeof (*vl.values) * vl.values_len);
1068 if (vl.values == NULL)
1069 {
1070 ERROR ("snmp plugin: malloc failed.");
1071 sfree (value_table_ptr);
1072 return (-1);
1073 }
1075 sstrncpy (vl.host, host->name, sizeof (vl.host));
1076 sstrncpy (vl.plugin, "snmp", sizeof (vl.plugin));
1078 vl.interval = host->interval;
1080 have_more = 1;
1081 memset (¤t_suffix, 0, sizeof (current_suffix));
1082 while (have_more)
1083 {
1084 _Bool suffix_skipped = 0;
1086 /* Determine next suffix to handle. */
1087 if (instance_list != NULL)
1088 {
1089 if (instance_list_ptr == NULL)
1090 {
1091 have_more = 0;
1092 continue;
1093 }
1095 memcpy (¤t_suffix, &instance_list_ptr->suffix, sizeof (current_suffix));
1096 }
1097 else /* no instance configured */
1098 {
1099 csnmp_table_values_t *ptr = value_table_ptr[0];
1100 if (ptr == NULL)
1101 {
1102 have_more = 0;
1103 continue;
1104 }
1106 memcpy (¤t_suffix, &ptr->suffix, sizeof (current_suffix));
1107 }
1109 /* Update all the value_table_ptr to point at the entry with the same
1110 * trailing partial OID */
1111 for (i = 0; i < data->values_len; i++)
1112 {
1113 while ((value_table_ptr[i] != NULL)
1114 && (csnmp_oid_compare (&value_table_ptr[i]->suffix, ¤t_suffix) < 0))
1115 value_table_ptr[i] = value_table_ptr[i]->next;
1117 if (value_table_ptr[i] == NULL)
1118 {
1119 have_more = 0;
1120 break;
1121 }
1122 else if (csnmp_oid_compare (&value_table_ptr[i]->suffix, ¤t_suffix) > 0)
1123 {
1124 /* This suffix is missing in the subtree. Indicate this with the
1125 * "suffix_skipped" flag and try the next instance / suffix. */
1126 suffix_skipped = 1;
1127 break;
1128 }
1129 } /* for (i = 0; i < columns; i++) */
1131 if (!have_more)
1132 break;
1134 /* Matching the values failed. Start from the beginning again. */
1135 if (suffix_skipped)
1136 {
1137 if (instance_list != NULL)
1138 instance_list_ptr = instance_list_ptr->next;
1139 else
1140 value_table_ptr[0] = value_table_ptr[0]->next;
1142 continue;
1143 }
1145 /* if we reach this line, all value_table_ptr[i] are non-NULL and are set
1146 * to the same subid. instance_list_ptr is either NULL or points to the
1147 * same subid, too. */
1148 #if COLLECT_DEBUG
1149 for (i = 1; i < data->values_len; i++)
1150 {
1151 assert (value_table_ptr[i] != NULL);
1152 assert (csnmp_oid_compare (&value_table_ptr[i-1]->suffix,
1153 &value_table_ptr[i]->suffix) == 0);
1154 }
1155 assert ((instance_list_ptr == NULL)
1156 || (csnmp_oid_compare (&instance_list_ptr->suffix,
1157 &value_table_ptr[0]->suffix) == 0));
1158 #endif
1160 sstrncpy (vl.type, data->type, sizeof (vl.type));
1162 {
1163 char temp[DATA_MAX_NAME_LEN];
1165 if (instance_list_ptr == NULL)
1166 csnmp_oid_to_string (temp, sizeof (temp), ¤t_suffix);
1167 else
1168 sstrncpy (temp, instance_list_ptr->instance, sizeof (temp));
1170 if (data->instance_prefix == NULL)
1171 sstrncpy (vl.type_instance, temp, sizeof (vl.type_instance));
1172 else
1173 ssnprintf (vl.type_instance, sizeof (vl.type_instance), "%s%s",
1174 data->instance_prefix, temp);
1175 }
1177 for (i = 0; i < data->values_len; i++)
1178 vl.values[i] = value_table_ptr[i]->value;
1180 /* If we get here `vl.type_instance' and all `vl.values' have been set */
1181 plugin_dispatch_values (&vl);
1183 if (instance_list != NULL)
1184 instance_list_ptr = instance_list_ptr->next;
1185 else
1186 value_table_ptr[0] = value_table_ptr[0]->next;
1187 } /* while (have_more) */
1189 sfree (vl.values);
1190 sfree (value_table_ptr);
1192 return (0);
1193 } /* int csnmp_dispatch_table */
1195 static int csnmp_read_table (host_definition_t *host, data_definition_t *data)
1196 {
1197 struct snmp_pdu *req;
1198 struct snmp_pdu *res;
1199 struct variable_list *vb;
1201 const data_set_t *ds;
1203 uint32_t oid_list_len = (uint32_t) (data->values_len + 1);
1204 /* Holds the last OID returned by the device. We use this in the GETNEXT
1205 * request to proceed. */
1206 oid_t oid_list[oid_list_len];
1207 /* Set to false when an OID has left its subtree so we don't re-request it
1208 * again. */
1209 _Bool oid_list_todo[oid_list_len];
1211 int status;
1212 int i;
1213 uint32_t j;
1215 /* `value_list_head' and `value_list_tail' implement a linked list for each
1216 * value. `instance_list_head' and `instance_list_tail' implement a linked list of
1217 * instance names. This is used to jump gaps in the table. */
1218 csnmp_list_instances_t *instance_list_head;
1219 csnmp_list_instances_t *instance_list_tail;
1220 csnmp_table_values_t **value_list_head;
1221 csnmp_table_values_t **value_list_tail;
1223 DEBUG ("snmp plugin: csnmp_read_table (host = %s, data = %s)",
1224 host->name, data->name);
1226 if (host->sess_handle == NULL)
1227 {
1228 DEBUG ("snmp plugin: csnmp_read_table: host->sess_handle == NULL");
1229 return (-1);
1230 }
1232 ds = plugin_get_ds (data->type);
1233 if (!ds)
1234 {
1235 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
1236 return (-1);
1237 }
1239 if (ds->ds_num != data->values_len)
1240 {
1241 ERROR ("snmp plugin: DataSet `%s' requires %i values, but config talks about %i",
1242 data->type, ds->ds_num, data->values_len);
1243 return (-1);
1244 }
1246 /* We need a copy of all the OIDs, because GETNEXT will destroy them. */
1247 memcpy (oid_list, data->values, data->values_len * sizeof (oid_t));
1248 if (data->instance.oid.oid_len > 0)
1249 memcpy (oid_list + data->values_len, &data->instance.oid, sizeof (oid_t));
1250 else /* no InstanceFrom option specified. */
1251 oid_list_len--;
1253 for (j = 0; j < oid_list_len; j++)
1254 oid_list_todo[j] = 1;
1256 /* We're going to construct n linked lists, one for each "value".
1257 * value_list_head will contain pointers to the heads of these linked lists,
1258 * value_list_tail will contain pointers to the tail of the lists. */
1259 value_list_head = calloc (data->values_len, sizeof (*value_list_head));
1260 value_list_tail = calloc (data->values_len, sizeof (*value_list_tail));
1261 if ((value_list_head == NULL) || (value_list_tail == NULL))
1262 {
1263 ERROR ("snmp plugin: csnmp_read_table: calloc failed.");
1264 sfree (value_list_head);
1265 sfree (value_list_tail);
1266 return (-1);
1267 }
1269 instance_list_head = NULL;
1270 instance_list_tail = NULL;
1272 status = 0;
1273 while (status == 0)
1274 {
1275 int oid_list_todo_num;
1277 req = snmp_pdu_create (SNMP_MSG_GETNEXT);
1278 if (req == NULL)
1279 {
1280 ERROR ("snmp plugin: snmp_pdu_create failed.");
1281 status = -1;
1282 break;
1283 }
1285 oid_list_todo_num = 0;
1286 for (j = 0; j < oid_list_len; j++)
1287 {
1288 /* Do not rerequest already finished OIDs */
1289 if (!oid_list_todo[j])
1290 continue;
1291 oid_list_todo_num++;
1292 snmp_add_null_var (req, oid_list[j].oid, oid_list[j].oid_len);
1293 }
1295 if (oid_list_todo_num == 0)
1296 {
1297 /* The request is still empty - so we are finished */
1298 DEBUG ("snmp plugin: all variables have left their subtree");
1299 status = 0;
1300 break;
1301 }
1303 res = NULL;
1304 status = snmp_sess_synch_response (host->sess_handle, req, &res);
1305 if ((status != STAT_SUCCESS) || (res == NULL))
1306 {
1307 char *errstr = NULL;
1309 snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
1311 c_complain (LOG_ERR, &host->complaint,
1312 "snmp plugin: host %s: snmp_sess_synch_response failed: %s",
1313 host->name, (errstr == NULL) ? "Unknown problem" : errstr);
1315 if (res != NULL)
1316 snmp_free_pdu (res);
1317 res = NULL;
1319 sfree (errstr);
1320 csnmp_host_close_session (host);
1322 status = -1;
1323 break;
1324 }
1326 status = 0;
1327 assert (res != NULL);
1328 c_release (LOG_INFO, &host->complaint,
1329 "snmp plugin: host %s: snmp_sess_synch_response successful.",
1330 host->name);
1332 vb = res->variables;
1333 if (vb == NULL)
1334 {
1335 status = -1;
1336 break;
1337 }
1339 for (vb = res->variables, i = 0; (vb != NULL); vb = vb->next_variable, i++)
1340 {
1341 /* Calculate value index from todo list */
1342 while (!oid_list_todo[i] && (i < oid_list_len))
1343 i++;
1345 /* An instance is configured and the res variable we process is the
1346 * instance value (last index) */
1347 if ((data->instance.oid.oid_len > 0) && (i == data->values_len))
1348 {
1349 if ((vb->type == SNMP_ENDOFMIBVIEW)
1350 || (snmp_oid_ncompare (data->instance.oid.oid,
1351 data->instance.oid.oid_len,
1352 vb->name, vb->name_length,
1353 data->instance.oid.oid_len) != 0))
1354 {
1355 DEBUG ("snmp plugin: host = %s; data = %s; Instance left its subtree.",
1356 host->name, data->name);
1357 oid_list_todo[i] = 0;
1358 continue;
1359 }
1361 /* Allocate a new `csnmp_list_instances_t', insert the instance name and
1362 * add it to the list */
1363 if (csnmp_instance_list_add (&instance_list_head, &instance_list_tail,
1364 res, host, data) != 0)
1365 {
1366 ERROR ("snmp plugin: csnmp_instance_list_add failed.");
1367 status = -1;
1368 break;
1369 }
1370 }
1371 else /* The variable we are processing is a normal value */
1372 {
1373 csnmp_table_values_t *vt;
1374 oid_t vb_name;
1375 oid_t suffix;
1376 int ret;
1378 csnmp_oid_init (&vb_name, vb->name, vb->name_length);
1380 /* Calculate the current suffix. This is later used to check that the
1381 * suffix is increasing. This also checks if we left the subtree */
1382 ret = csnmp_oid_suffix (&suffix, &vb_name, data->values + i);
1383 if (ret != 0)
1384 {
1385 DEBUG ("snmp plugin: host = %s; data = %s; i = %i; "
1386 "Value probably left its subtree.",
1387 host->name, data->name, i);
1388 oid_list_todo[i] = 0;
1389 continue;
1390 }
1392 /* Make sure the OIDs returned by the agent are increasing. Otherwise our
1393 * table matching algorithm will get confused. */
1394 if ((value_list_tail[i] != NULL)
1395 && (csnmp_oid_compare (&suffix, &value_list_tail[i]->suffix) <= 0))
1396 {
1397 DEBUG ("snmp plugin: host = %s; data = %s; i = %i; "
1398 "Suffix is not increasing.",
1399 host->name, data->name, i);
1400 oid_list_todo[i] = 0;
1401 continue;
1402 }
1404 vt = malloc (sizeof (*vt));
1405 if (vt == NULL)
1406 {
1407 ERROR ("snmp plugin: malloc failed.");
1408 status = -1;
1409 break;
1410 }
1411 memset (vt, 0, sizeof (*vt));
1413 vt->value = csnmp_value_list_to_value (vb, ds->ds[i].type,
1414 data->scale, data->shift, host->name, data->name);
1415 memcpy (&vt->suffix, &suffix, sizeof (vt->suffix));
1416 vt->next = NULL;
1418 if (value_list_tail[i] == NULL)
1419 value_list_head[i] = vt;
1420 else
1421 value_list_tail[i]->next = vt;
1422 value_list_tail[i] = vt;
1423 }
1425 /* Copy OID to oid_list[i] */
1426 memcpy (oid_list[i].oid, vb->name, sizeof (oid) * vb->name_length);
1427 oid_list[i].oid_len = vb->name_length;
1429 } /* for (vb = res->variables ...) */
1431 if (res != NULL)
1432 snmp_free_pdu (res);
1433 res = NULL;
1434 } /* while (status == 0) */
1436 if (res != NULL)
1437 snmp_free_pdu (res);
1438 res = NULL;
1440 if (status == 0)
1441 csnmp_dispatch_table (host, data, instance_list_head, value_list_head);
1443 /* Free all allocated variables here */
1444 while (instance_list_head != NULL)
1445 {
1446 csnmp_list_instances_t *next = instance_list_head->next;
1447 sfree (instance_list_head);
1448 instance_list_head = next;
1449 }
1451 for (i = 0; i < data->values_len; i++)
1452 {
1453 while (value_list_head[i] != NULL)
1454 {
1455 csnmp_table_values_t *next = value_list_head[i]->next;
1456 sfree (value_list_head[i]);
1457 value_list_head[i] = next;
1458 }
1459 }
1461 sfree (value_list_head);
1462 sfree (value_list_tail);
1464 return (0);
1465 } /* int csnmp_read_table */
1467 static int csnmp_read_value (host_definition_t *host, data_definition_t *data)
1468 {
1469 struct snmp_pdu *req;
1470 struct snmp_pdu *res;
1471 struct variable_list *vb;
1473 const data_set_t *ds;
1474 value_list_t vl = VALUE_LIST_INIT;
1476 int status;
1477 int i;
1479 DEBUG ("snmp plugin: csnmp_read_value (host = %s, data = %s)",
1480 host->name, data->name);
1482 if (host->sess_handle == NULL)
1483 {
1484 DEBUG ("snmp plugin: csnmp_read_table: host->sess_handle == NULL");
1485 return (-1);
1486 }
1488 ds = plugin_get_ds (data->type);
1489 if (!ds)
1490 {
1491 ERROR ("snmp plugin: DataSet `%s' not defined.", data->type);
1492 return (-1);
1493 }
1495 if (ds->ds_num != data->values_len)
1496 {
1497 ERROR ("snmp plugin: DataSet `%s' requires %i values, but config talks about %i",
1498 data->type, ds->ds_num, data->values_len);
1499 return (-1);
1500 }
1502 vl.values_len = ds->ds_num;
1503 vl.values = (value_t *) malloc (sizeof (value_t) * vl.values_len);
1504 if (vl.values == NULL)
1505 return (-1);
1506 for (i = 0; i < vl.values_len; i++)
1507 {
1508 if (ds->ds[i].type == DS_TYPE_COUNTER)
1509 vl.values[i].counter = 0;
1510 else
1511 vl.values[i].gauge = NAN;
1512 }
1514 sstrncpy (vl.host, host->name, sizeof (vl.host));
1515 sstrncpy (vl.plugin, "snmp", sizeof (vl.plugin));
1516 sstrncpy (vl.type, data->type, sizeof (vl.type));
1517 sstrncpy (vl.type_instance, data->instance.string, sizeof (vl.type_instance));
1519 vl.interval = host->interval;
1521 req = snmp_pdu_create (SNMP_MSG_GET);
1522 if (req == NULL)
1523 {
1524 ERROR ("snmp plugin: snmp_pdu_create failed.");
1525 sfree (vl.values);
1526 return (-1);
1527 }
1529 for (i = 0; i < data->values_len; i++)
1530 snmp_add_null_var (req, data->values[i].oid, data->values[i].oid_len);
1532 res = NULL;
1533 status = snmp_sess_synch_response (host->sess_handle, req, &res);
1535 if ((status != STAT_SUCCESS) || (res == NULL))
1536 {
1537 char *errstr = NULL;
1539 snmp_sess_error (host->sess_handle, NULL, NULL, &errstr);
1540 ERROR ("snmp plugin: host %s: snmp_sess_synch_response failed: %s",
1541 host->name, (errstr == NULL) ? "Unknown problem" : errstr);
1543 if (res != NULL)
1544 snmp_free_pdu (res);
1545 res = NULL;
1547 sfree (errstr);
1548 csnmp_host_close_session (host);
1550 return (-1);
1551 }
1554 for (vb = res->variables; vb != NULL; vb = vb->next_variable)
1555 {
1556 #if COLLECT_DEBUG
1557 char buffer[1024];
1558 snprint_variable (buffer, sizeof (buffer),
1559 vb->name, vb->name_length, vb);
1560 DEBUG ("snmp plugin: Got this variable: %s", buffer);
1561 #endif /* COLLECT_DEBUG */
1563 for (i = 0; i < data->values_len; i++)
1564 if (snmp_oid_compare (data->values[i].oid, data->values[i].oid_len,
1565 vb->name, vb->name_length) == 0)
1566 vl.values[i] = csnmp_value_list_to_value (vb, ds->ds[i].type,
1567 data->scale, data->shift, host->name, data->name);
1568 } /* for (res->variables) */
1570 if (res != NULL)
1571 snmp_free_pdu (res);
1572 res = NULL;
1574 DEBUG ("snmp plugin: -> plugin_dispatch_values (&vl);");
1575 plugin_dispatch_values (&vl);
1576 sfree (vl.values);
1578 return (0);
1579 } /* int csnmp_read_value */
1581 static int csnmp_read_host (user_data_t *ud)
1582 {
1583 host_definition_t *host;
1584 cdtime_t time_start;
1585 cdtime_t time_end;
1586 int status;
1587 int success;
1588 int i;
1590 host = ud->data;
1592 if (host->interval == 0)
1593 host->interval = plugin_get_interval ();
1595 time_start = cdtime ();
1597 if (host->sess_handle == NULL)
1598 csnmp_host_open_session (host);
1600 if (host->sess_handle == NULL)
1601 return (-1);
1603 success = 0;
1604 for (i = 0; i < host->data_list_len; i++)
1605 {
1606 data_definition_t *data = host->data_list[i];
1608 if (data->is_table)
1609 status = csnmp_read_table (host, data);
1610 else
1611 status = csnmp_read_value (host, data);
1613 if (status == 0)
1614 success++;
1615 }
1617 time_end = cdtime ();
1618 if ((time_end - time_start) > host->interval)
1619 {
1620 WARNING ("snmp plugin: Host `%s' should be queried every %.3f "
1621 "seconds, but reading all values takes %.3f seconds.",
1622 host->name,
1623 CDTIME_T_TO_DOUBLE (host->interval),
1624 CDTIME_T_TO_DOUBLE (time_end - time_start));
1625 }
1627 if (success == 0)
1628 return (-1);
1630 return (0);
1631 } /* int csnmp_read_host */
1633 static int csnmp_init (void)
1634 {
1635 call_snmp_init_once ();
1637 return (0);
1638 } /* int csnmp_init */
1640 static int csnmp_shutdown (void)
1641 {
1642 data_definition_t *data_this;
1643 data_definition_t *data_next;
1645 /* When we get here, the read threads have been stopped and all the
1646 * `host_definition_t' will be freed. */
1647 DEBUG ("snmp plugin: Destroying all data definitions.");
1649 data_this = data_head;
1650 data_head = NULL;
1651 while (data_this != NULL)
1652 {
1653 data_next = data_this->next;
1655 sfree (data_this->name);
1656 sfree (data_this->type);
1657 sfree (data_this->values);
1658 sfree (data_this);
1660 data_this = data_next;
1661 }
1663 return (0);
1664 } /* int csnmp_shutdown */
1666 void module_register (void)
1667 {
1668 plugin_register_complex_config ("snmp", csnmp_config);
1669 plugin_register_init ("snmp", csnmp_init);
1670 plugin_register_shutdown ("snmp", csnmp_shutdown);
1671 } /* void module_register */
1673 /*
1674 * vim: shiftwidth=2 softtabstop=2 tabstop=8 fdm=marker
1675 */