2 * Copyright (c) 2001-2003
3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus).
6 * Author: Harti Brandt <harti@freebsd.org>
8 * Copyright (c) 2010 The FreeBSD Foundation
11 * Portions of this software were developed by Shteryana Sotirova Shopova
12 * under sponsorship from the FreeBSD Foundation.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
23 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * $Begemot: bsnmp/snmpd/snmpmod.h,v 1.32 2006/02/14 09:04:20 brandt_h Exp $
37 * SNMP daemon data and functions exported to modules.
42 #include <sys/types.h>
43 #include <sys/queue.h>
44 #include <sys/socket.h>
46 #include <netinet/in.h>
49 #include "snmpagent.h"
51 #define MAX_MOD_ARGS 16
54 * These macros help to handle object lists for SNMP tables. They use
55 * tail queues to hold the objects in ascending order in the list.
56 * ordering can be done either on an integer/unsigned field, an asn_oid
57 * or an ordering function.
59 #define INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, LINK, INDEX) do { \
60 __typeof (PTR) _lelem; \
62 TAILQ_FOREACH(_lelem, (LIST), LINK) \
63 if (asn_compare_oid(&_lelem->INDEX, &(PTR)->INDEX) > 0) \
66 TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \
68 TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \
71 #define INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, LINK, INDEX) do { \
72 __typeof (PTR) _lelem; \
74 TAILQ_FOREACH(_lelem, (LIST), LINK) \
75 if ((asn_subid_t)_lelem->INDEX > (asn_subid_t)(PTR)->INDEX)\
78 TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \
80 TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \
83 #define INSERT_OBJECT_FUNC_LINK(PTR, LIST, LINK, FUNC) do { \
84 __typeof (PTR) _lelem; \
86 TAILQ_FOREACH(_lelem, (LIST), LINK) \
87 if ((FUNC)(_lelem, (PTR)) > 0) \
90 TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \
92 TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \
95 #define INSERT_OBJECT_FUNC_LINK_REV(PTR, LIST, HEAD, LINK, FUNC) do { \
96 __typeof (PTR) _lelem; \
98 TAILQ_FOREACH_REVERSE(_lelem, (LIST), HEAD, LINK) \
99 if ((FUNC)(_lelem, (PTR)) < 0) \
101 if (_lelem == NULL) \
102 TAILQ_INSERT_HEAD((LIST), (PTR), LINK); \
104 TAILQ_INSERT_AFTER((LIST), _lelem, (PTR), LINK); \
107 #define FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \
108 __typeof (TAILQ_FIRST(LIST)) _lelem; \
110 TAILQ_FOREACH(_lelem, (LIST), LINK) \
111 if (index_compare(OID, SUB, &_lelem->INDEX) == 0) \
116 #define NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \
117 __typeof (TAILQ_FIRST(LIST)) _lelem; \
119 TAILQ_FOREACH(_lelem, (LIST), LINK) \
120 if (index_compare(OID, SUB, &_lelem->INDEX) < 0) \
125 #define FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \
126 __typeof (TAILQ_FIRST(LIST)) _lelem; \
128 if ((OID)->len - SUB != 1) \
131 TAILQ_FOREACH(_lelem, (LIST), LINK) \
132 if ((OID)->subs[SUB] == (asn_subid_t)_lelem->INDEX)\
137 #define NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \
138 __typeof (TAILQ_FIRST(LIST)) _lelem; \
140 if ((OID)->len - SUB == 0) \
141 _lelem = TAILQ_FIRST(LIST); \
143 TAILQ_FOREACH(_lelem, (LIST), LINK) \
144 if ((OID)->subs[SUB] < (asn_subid_t)_lelem->INDEX)\
149 #define FIND_OBJECT_FUNC_LINK(LIST, OID, SUB, LINK, FUNC) ({ \
150 __typeof (TAILQ_FIRST(LIST)) _lelem; \
152 TAILQ_FOREACH(_lelem, (LIST), LINK) \
153 if ((FUNC)(OID, SUB, _lelem) == 0) \
158 #define NEXT_OBJECT_FUNC_LINK(LIST, OID, SUB, LINK, FUNC) ({ \
159 __typeof (TAILQ_FIRST(LIST)) _lelem; \
161 TAILQ_FOREACH(_lelem, (LIST), LINK) \
162 if ((FUNC)(OID, SUB, _lelem) < 0) \
168 * Macros for the case where the index field is called 'index'
170 #define INSERT_OBJECT_OID_LINK(PTR, LIST, LINK) \
171 INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, LINK, index)
173 #define INSERT_OBJECT_INT_LINK(PTR, LIST, LINK) do { \
174 INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, LINK, index)
176 #define FIND_OBJECT_OID_LINK(LIST, OID, SUB, LINK) \
177 FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, index)
179 #define NEXT_OBJECT_OID_LINK(LIST, OID, SUB, LINK) \
180 NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, index)
182 #define FIND_OBJECT_INT_LINK(LIST, OID, SUB, LINK) \
183 FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, index)
185 #define NEXT_OBJECT_INT_LINK(LIST, OID, SUB, LINK) \
186 NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, index)
189 * Macros for the case where the index field is called 'index' and the
192 #define INSERT_OBJECT_OID(PTR, LIST) \
193 INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, link, index)
195 #define INSERT_OBJECT_INT(PTR, LIST) \
196 INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, link, index)
198 #define INSERT_OBJECT_FUNC_REV(PTR, LIST, HEAD, FUNC) \
199 INSERT_OBJECT_FUNC_LINK_REV(PTR, LIST, HEAD, link, FUNC)
201 #define FIND_OBJECT_OID(LIST, OID, SUB) \
202 FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, link, index)
204 #define FIND_OBJECT_INT(LIST, OID, SUB) \
205 FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, link, index)
207 #define FIND_OBJECT_FUNC(LIST, OID, SUB, FUNC) \
208 FIND_OBJECT_FUNC_LINK(LIST, OID, SUB, link, FUNC)
210 #define NEXT_OBJECT_OID(LIST, OID, SUB) \
211 NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, link, index)
213 #define NEXT_OBJECT_INT(LIST, OID, SUB) \
214 NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, link, index)
216 #define NEXT_OBJECT_FUNC(LIST, OID, SUB, FUNC) \
217 NEXT_OBJECT_FUNC_LINK(LIST, OID, SUB, link, FUNC)
221 /* The tick when the program was started. This is the absolute time of
222 * the start in 100th of a second. */
223 extern uint64_t start_tick;
225 /* The tick when the current packet was received. This is the absolute
226 * time in 100th of second. */
227 extern uint64_t this_tick;
229 /* Get the current absolute time in 100th of a second. */
230 uint64_t get_ticks(void);
233 * Return code for proxy function
235 enum snmpd_proxy_err {
236 /* proxy code will process the PDU */
238 /* proxy code does not process PDU */
242 /* drop because of bad community */
244 /* drop because of bad community use */
245 SNMPD_PROXY_BADCOMMUSE
251 enum snmpd_input_err {
252 /* proceed with packet */
254 /* fatal error in packet, ignore it */
256 /* value encoding has wrong length in a SET operation */
257 SNMPD_INPUT_VALBADLEN,
258 /* value encoding is out of range */
259 SNMPD_INPUT_VALRANGE,
260 /* value has bad encoding */
261 SNMPD_INPUT_VALBADENC,
262 /* need more data (truncated packet) */
264 /* unknown community */
265 SNMPD_INPUT_BAD_COMM,
269 * Every loadable module must have one of this structures with
270 * the external name 'config'.
273 /* a comment describing what this module implements */
276 /* the initialization function */
277 int (*init)(struct lmodule *, int argc, char *argv[]);
279 /* the finalisation function */
282 /* the idle function */
285 /* the dump function */
288 /* re-configuration function */
289 void (*config)(void);
291 /* start operation */
295 enum snmpd_proxy_err (*proxy)(struct snmp_pdu *, void *,
296 const struct asn_oid *, const struct sockaddr *, socklen_t,
297 enum snmpd_input_err, int32_t, int);
299 /* the tree this module is going to server */
300 const struct snmp_node *tree;
303 /* function called, when another module was unloaded/loaded */
304 void (*loading)(const struct lmodule *, int);
308 * Stuff exported to modules
316 struct asn_oid object_id;
321 uint32_t or_last_change;
323 extern struct systemg systemg;
328 * We have 2 fixed communities for SNMP read and write access. Modules
329 * can create their communities dynamically. They are deleted automatically
330 * if the module is unloaded.
332 #define COMM_INITIALIZE 0
336 u_int comm_define(u_int, const char *descr, struct lmodule *, const char *str);
337 struct community *comm_define_ordered(u_int priv, const char *descr,
338 struct asn_oid *index, struct lmodule *owner, const char *str);
339 const char * comm_string(u_int);
341 /* community for current packet */
342 extern u_int community;
345 * SNMP User-based Security Model data. Modified via the snmp_usm(3) module.
347 struct snmpd_usmstat {
348 uint32_t unsupported_seclevels;
349 uint32_t not_in_time_windows;
350 uint32_t unknown_users;
351 uint32_t unknown_engine_ids;
352 uint32_t wrong_digests;
353 uint32_t decrypt_errors;
356 extern struct snmpd_usmstat snmpd_usmstats;
357 struct snmpd_usmstat *bsnmpd_get_usm_stats(void);
358 void bsnmpd_reset_usm_stats(void);
361 struct snmp_user suser;
362 uint8_t user_engine_id[SNMP_ENGINE_ID_SIZ];
363 uint32_t user_engine_len;
364 char user_public[SNMP_ADM_STR32_SIZ];
365 uint32_t user_public_len;
368 SLIST_ENTRY(usm_user) up;
371 SLIST_HEAD(usm_userlist, usm_user);
372 struct usm_user *usm_first_user(void);
373 struct usm_user *usm_next_user(struct usm_user *);
374 struct usm_user *usm_find_user(uint8_t *, uint32_t, char *);
375 struct usm_user *usm_new_user(uint8_t *, uint32_t, char *);
376 void usm_delete_user(struct usm_user *);
377 void usm_flush_users(void);
379 /* USM user for current packet */
380 extern struct usm_user *usm_user;
383 * SNMP View-based Access Control Model data. Modified via the snmp_vacm(3) module.
388 /* Security user name from USM */
389 char secname[SNMP_ADM_STR32_SIZ];
391 /* Back pointer to user assigned group name */
392 struct vacm_group *group;
395 SLIST_ENTRY(vacm_user) vvu;
396 SLIST_ENTRY(vacm_user) vvg;
399 SLIST_HEAD(vacm_userlist, vacm_user);
402 char groupname[SNMP_ADM_STR32_SIZ];
403 struct vacm_userlist group_users;
404 SLIST_ENTRY(vacm_group) vge;
407 SLIST_HEAD(vacm_grouplist, vacm_group);
410 /* The group name is index, not a column in the table */
411 struct vacm_group *group;
412 char ctx_prefix[SNMP_ADM_STR32_SIZ];
416 struct vacm_view *read_view;
417 struct vacm_view *write_view;
418 struct vacm_view *notify_view;
421 TAILQ_ENTRY(vacm_access) vva;
424 TAILQ_HEAD(vacm_accesslist, vacm_access);
427 char viewname[SNMP_ADM_STR32_SIZ]; /* key */
428 struct asn_oid subtree; /* key */
433 SLIST_ENTRY(vacm_view) vvl;
436 SLIST_HEAD(vacm_viewlist, vacm_view);
438 struct vacm_context {
439 /* The ID of the module that registered this context */
441 char ctxname[SNMP_ADM_STR32_SIZ];
442 SLIST_ENTRY(vacm_context) vcl;
445 SLIST_HEAD(vacm_contextlist, vacm_context);
447 void vacm_groups_init(void);
448 struct vacm_user *vacm_first_user(void);
449 struct vacm_user *vacm_next_user(struct vacm_user *);
450 struct vacm_user *vacm_new_user(int32_t, char *);
451 int vacm_delete_user(struct vacm_user *);
452 int vacm_user_set_group(struct vacm_user *, u_char *, u_int);
453 struct vacm_access *vacm_first_access_rule(void);
454 struct vacm_access *vacm_next_access_rule(struct vacm_access *);
455 struct vacm_access *vacm_new_access_rule(char *, char *, int32_t, int32_t);
456 int vacm_delete_access_rule(struct vacm_access *);
457 struct vacm_view *vacm_first_view(void);
458 struct vacm_view *vacm_next_view(struct vacm_view *);
459 struct vacm_view *vacm_new_view(char *, struct asn_oid *);
460 int vacm_delete_view(struct vacm_view *);
461 struct vacm_context *vacm_first_context(void);
462 struct vacm_context *vacm_next_context(struct vacm_context *);
463 struct vacm_context *vacm_add_context(char *, int32_t);
464 void vacm_flush_contexts(int32_t);
467 * RFC 3413 SNMP Management Target & Notification MIB
470 struct snmpd_target_stats {
471 uint32_t unavail_contexts;
472 uint32_t unknown_contexts;
475 #define SNMP_UDP_ADDR_SIZ 6
476 #define SNMP_TAG_SIZ (255 + 1)
478 struct target_address {
479 char name[SNMP_ADM_STR32_SIZ];
480 uint8_t address[SNMP_UDP_ADDR_SIZ];
483 char taglist[SNMP_TAG_SIZ];
484 char paramname[SNMP_ADM_STR32_SIZ];
488 SLIST_ENTRY(target_address) ta;
491 SLIST_HEAD(target_addresslist, target_address);
493 struct target_param {
494 char name[SNMP_ADM_STR32_SIZ];
497 char secname[SNMP_ADM_STR32_SIZ];
498 enum snmp_usm_level sec_level;
501 SLIST_ENTRY(target_param) tp;
504 SLIST_HEAD(target_paramlist, target_param);
506 struct target_notify {
507 char name[SNMP_ADM_STR32_SIZ];
508 char taglist[SNMP_TAG_SIZ];
512 SLIST_ENTRY(target_notify) tn;
515 SLIST_HEAD(target_notifylist, target_notify);
517 extern struct snmpd_target_stats snmpd_target_stats;
518 struct snmpd_target_stats *bsnmpd_get_target_stats(void);
519 struct target_address *target_first_address(void);
520 struct target_address *target_next_address(struct target_address *);
521 struct target_address *target_new_address(char *);
522 int target_activate_address(struct target_address *);
523 int target_delete_address(struct target_address *);
524 struct target_param *target_first_param(void);
525 struct target_param *target_next_param(struct target_param *);
526 struct target_param *target_new_param(char *);
527 int target_delete_param(struct target_param *);
528 struct target_notify *target_first_notify(void);
529 struct target_notify *target_next_notify(struct target_notify *);
530 struct target_notify *target_new_notify(char *);
531 int target_delete_notify (struct target_notify *);
532 void target_flush_all(void);
537 extern const struct asn_oid oid_zeroDotZero;
539 /* SNMPv3 Engine Discovery */
540 extern const struct asn_oid oid_usmUnknownEngineIDs;
541 extern const struct asn_oid oid_usmNotInTimeWindows;
546 * A module can request a range of request ids and associate them with a
547 * type field. All ranges are deleted if a module is unloaded.
549 u_int reqid_allocate(int size, struct lmodule *);
550 int32_t reqid_next(u_int type);
551 int32_t reqid_base(u_int type);
552 int reqid_istype(int32_t reqid, u_int type);
553 u_int reqid_type(int32_t reqid);
558 void *timer_start(u_int, void (*)(void *), void *, struct lmodule *);
559 void *timer_start_repeat(u_int, u_int, void (*)(void *), void *,
561 void timer_stop(void *);
566 void *fd_select(int, void (*)(int, void *), void *, struct lmodule *);
567 void fd_deselect(void *);
568 void fd_suspend(void *);
569 int fd_resume(void *);
574 u_int or_register(const struct asn_oid *, const char *, struct lmodule *);
575 void or_unregister(u_int);
580 void *buf_alloc(int tx);
581 size_t buf_size(int tx);
583 /* decode PDU and find community */
584 enum snmpd_input_err snmp_input_start(const u_char *, size_t, const char *,
585 struct snmp_pdu *, int32_t *, size_t *);
587 /* process the pdu. returns either _OK or _FAILED */
588 enum snmpd_input_err snmp_input_finish(struct snmp_pdu *, const u_char *,
589 size_t, u_char *, size_t *, const char *, enum snmpd_input_err, int32_t,
592 void snmp_output(struct snmp_pdu *, u_char *, size_t *, const char *);
593 void snmp_send_port(void *, const struct asn_oid *, struct snmp_pdu *,
594 const struct sockaddr *, socklen_t);
595 enum snmp_code snmp_pdu_auth_access(struct snmp_pdu *, int32_t *);
598 void snmp_send_trap(const struct asn_oid *, ...);
603 int string_save(struct snmp_value *, struct snmp_context *, ssize_t, u_char **);
604 void string_commit(struct snmp_context *);
605 void string_rollback(struct snmp_context *, u_char **);
606 int string_get(struct snmp_value *, const u_char *, ssize_t);
607 int string_get_max(struct snmp_value *, const u_char *, ssize_t, size_t);
608 void string_free(struct snmp_context *);
610 int ip_save(struct snmp_value *, struct snmp_context *, u_char *);
611 void ip_rollback(struct snmp_context *, u_char *);
612 void ip_commit(struct snmp_context *);
613 int ip_get(struct snmp_value *, u_char *);
615 int oid_save(struct snmp_value *, struct snmp_context *, struct asn_oid *);
616 void oid_rollback(struct snmp_context *, struct asn_oid *);
617 void oid_commit(struct snmp_context *);
618 int oid_get(struct snmp_value *, const struct asn_oid *);
620 int index_decode(const struct asn_oid *oid, u_int sub, u_int code, ...);
621 int index_compare(const struct asn_oid *, u_int, const struct asn_oid *);
622 int index_compare_off(const struct asn_oid *, u_int, const struct asn_oid *,
624 void index_append(struct asn_oid *, u_int, const struct asn_oid *);
625 void index_append_off(struct asn_oid *, u_int, const struct asn_oid *, u_int);