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/*
* Copyright (c) 2001-2003
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
* All rights reserved.
*
* Author: Harti Brandt <harti@freebsd.org>
*
* Copyright (c) 2010 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by Shteryana Sotirova Shopova
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Begemot: bsnmp/snmpd/snmpmod.h,v 1.32 2006/02/14 09:04:20 brandt_h Exp $
*
* SNMP daemon data and functions exported to modules.
*/
#ifndef snmpmod_h_
#define snmpmod_h_
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include "asn1.h"
#include "snmp.h"
#include "snmpagent.h"
#define MAX_MOD_ARGS 16
/*
* These macros help to handle object lists for SNMP tables. They use
* tail queues to hold the objects in ascending order in the list.
* ordering can be done either on an integer/unsigned field, an asn_oid
* or an ordering function.
*/
#define INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, LINK, INDEX) do { \
__typeof (PTR) _lelem; \
\
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if (asn_compare_oid(&_lelem->INDEX, &(PTR)->INDEX) > 0) \
break; \
if (_lelem == NULL) \
TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \
else \
TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \
} while (0)
#define INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, LINK, INDEX) do { \
__typeof (PTR) _lelem; \
\
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if ((asn_subid_t)_lelem->INDEX > (asn_subid_t)(PTR)->INDEX)\
break; \
if (_lelem == NULL) \
TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \
else \
TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \
} while (0)
#define INSERT_OBJECT_FUNC_LINK(PTR, LIST, LINK, FUNC) do { \
__typeof (PTR) _lelem; \
\
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if ((FUNC)(_lelem, (PTR)) > 0) \
break; \
if (_lelem == NULL) \
TAILQ_INSERT_TAIL((LIST), (PTR), LINK); \
else \
TAILQ_INSERT_BEFORE(_lelem, (PTR), LINK); \
} while (0)
#define INSERT_OBJECT_FUNC_LINK_REV(PTR, LIST, HEAD, LINK, FUNC) do { \
__typeof (PTR) _lelem; \
\
TAILQ_FOREACH_REVERSE(_lelem, (LIST), HEAD, LINK) \
if ((FUNC)(_lelem, (PTR)) < 0) \
break; \
if (_lelem == NULL) \
TAILQ_INSERT_HEAD((LIST), (PTR), LINK); \
else \
TAILQ_INSERT_AFTER((LIST), _lelem, (PTR), LINK); \
} while (0)
#define FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \
__typeof (TAILQ_FIRST(LIST)) _lelem; \
\
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if (index_compare(OID, SUB, &_lelem->INDEX) == 0) \
break; \
(_lelem); \
})
#define NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \
__typeof (TAILQ_FIRST(LIST)) _lelem; \
\
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if (index_compare(OID, SUB, &_lelem->INDEX) < 0) \
break; \
(_lelem); \
})
#define FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \
__typeof (TAILQ_FIRST(LIST)) _lelem; \
\
if ((OID)->len - SUB != 1) \
_lelem = NULL; \
else \
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if ((OID)->subs[SUB] == (asn_subid_t)_lelem->INDEX)\
break; \
(_lelem); \
})
#define NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, INDEX) ({ \
__typeof (TAILQ_FIRST(LIST)) _lelem; \
\
if ((OID)->len - SUB == 0) \
_lelem = TAILQ_FIRST(LIST); \
else \
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if ((OID)->subs[SUB] < (asn_subid_t)_lelem->INDEX)\
break; \
(_lelem); \
})
#define FIND_OBJECT_FUNC_LINK(LIST, OID, SUB, LINK, FUNC) ({ \
__typeof (TAILQ_FIRST(LIST)) _lelem; \
\
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if ((FUNC)(OID, SUB, _lelem) == 0) \
break; \
(_lelem); \
})
#define NEXT_OBJECT_FUNC_LINK(LIST, OID, SUB, LINK, FUNC) ({ \
__typeof (TAILQ_FIRST(LIST)) _lelem; \
\
TAILQ_FOREACH(_lelem, (LIST), LINK) \
if ((FUNC)(OID, SUB, _lelem) < 0) \
break; \
(_lelem); \
})
/*
* Macros for the case where the index field is called 'index'
*/
#define INSERT_OBJECT_OID_LINK(PTR, LIST, LINK) \
INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, LINK, index)
#define INSERT_OBJECT_INT_LINK(PTR, LIST, LINK) do { \
INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, LINK, index)
#define FIND_OBJECT_OID_LINK(LIST, OID, SUB, LINK) \
FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, index)
#define NEXT_OBJECT_OID_LINK(LIST, OID, SUB, LINK) \
NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, LINK, index)
#define FIND_OBJECT_INT_LINK(LIST, OID, SUB, LINK) \
FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, index)
#define NEXT_OBJECT_INT_LINK(LIST, OID, SUB, LINK) \
NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, LINK, index)
/*
* Macros for the case where the index field is called 'index' and the
* link field 'link'.
*/
#define INSERT_OBJECT_OID(PTR, LIST) \
INSERT_OBJECT_OID_LINK_INDEX(PTR, LIST, link, index)
#define INSERT_OBJECT_INT(PTR, LIST) \
INSERT_OBJECT_INT_LINK_INDEX(PTR, LIST, link, index)
#define INSERT_OBJECT_FUNC_REV(PTR, LIST, HEAD, FUNC) \
INSERT_OBJECT_FUNC_LINK_REV(PTR, LIST, HEAD, link, FUNC)
#define FIND_OBJECT_OID(LIST, OID, SUB) \
FIND_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, link, index)
#define FIND_OBJECT_INT(LIST, OID, SUB) \
FIND_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, link, index)
#define FIND_OBJECT_FUNC(LIST, OID, SUB, FUNC) \
FIND_OBJECT_FUNC_LINK(LIST, OID, SUB, link, FUNC)
#define NEXT_OBJECT_OID(LIST, OID, SUB) \
NEXT_OBJECT_OID_LINK_INDEX(LIST, OID, SUB, link, index)
#define NEXT_OBJECT_INT(LIST, OID, SUB) \
NEXT_OBJECT_INT_LINK_INDEX(LIST, OID, SUB, link, index)
#define NEXT_OBJECT_FUNC(LIST, OID, SUB, FUNC) \
NEXT_OBJECT_FUNC_LINK(LIST, OID, SUB, link, FUNC)
struct lmodule;
/* The tick when the program was started. This is the absolute time of
* the start in 100th of a second. */
extern uint64_t start_tick;
/* The tick when the current packet was received. This is the absolute
* time in 100th of second. */
extern uint64_t this_tick;
/* Get the current absolute time in 100th of a second. */
uint64_t get_ticks(void);
/*
* Return code for proxy function
*/
enum snmpd_proxy_err {
/* proxy code will process the PDU */
SNMPD_PROXY_OK,
/* proxy code does not process PDU */
SNMPD_PROXY_REJ,
/* drop this PDU */
SNMPD_PROXY_DROP,
/* drop because of bad community */
SNMPD_PROXY_BADCOMM,
/* drop because of bad community use */
SNMPD_PROXY_BADCOMMUSE
};
/*
* Input handling
*/
enum snmpd_input_err {
/* proceed with packet */
SNMPD_INPUT_OK,
/* fatal error in packet, ignore it */
SNMPD_INPUT_FAILED,
/* value encoding has wrong length in a SET operation */
SNMPD_INPUT_VALBADLEN,
/* value encoding is out of range */
SNMPD_INPUT_VALRANGE,
/* value has bad encoding */
SNMPD_INPUT_VALBADENC,
/* need more data (truncated packet) */
SNMPD_INPUT_TRUNC,
/* unknown community */
SNMPD_INPUT_BAD_COMM,
};
/*
* Every loadable module must have one of this structures with
* the external name 'config'.
*/
struct snmp_module {
/* a comment describing what this module implements */
const char *comment;
/* the initialization function */
int (*init)(struct lmodule *, int argc, char *argv[]);
/* the finalisation function */
int (*fini)(void);
/* the idle function */
void (*idle)(void);
/* the dump function */
void (*dump)(void);
/* re-configuration function */
void (*config)(void);
/* start operation */
void (*start)(void);
/* proxy a PDU */
enum snmpd_proxy_err (*proxy)(struct snmp_pdu *, void *,
const struct asn_oid *, const struct sockaddr *, socklen_t,
enum snmpd_input_err, int32_t, int);
/* the tree this module is going to server */
const struct snmp_node *tree;
u_int tree_size;
/* function called, when another module was unloaded/loaded */
void (*loading)(const struct lmodule *, int);
};
/*
* Stuff exported to modules
*/
/*
* The system group.
*/
struct systemg {
u_char *descr;
struct asn_oid object_id;
u_char *contact;
u_char *name;
u_char *location;
u_int32_t services;
u_int32_t or_last_change;
};
extern struct systemg systemg;
/*
* Community support.
*
* We have 2 fixed communities for SNMP read and write access. Modules
* can create their communities dynamically. They are deleted automatically
* if the module is unloaded.
*/
#define COMM_INITIALIZE 0
#define COMM_READ 1
#define COMM_WRITE 2
u_int comm_define(u_int, const char *descr, struct lmodule *, const char *str);
const char * comm_string(u_int);
/* community for current packet */
extern u_int community;
/*
* SNMP User-based Security Model data. Modified via the snmp_usm(3) module.
*/
struct snmpd_usmstat {
uint32_t unsupported_seclevels;
uint32_t not_in_time_windows;
uint32_t unknown_users;
uint32_t unknown_engine_ids;
uint32_t wrong_digests;
uint32_t decrypt_errors;
};
extern struct snmpd_usmstat snmpd_usmstats;
struct snmpd_usmstat *bsnmpd_get_usm_stats(void);
void bsnmpd_reset_usm_stats(void);
struct usm_user {
struct snmp_user suser;
uint8_t user_engine_id[SNMP_ENGINE_ID_SIZ];
uint32_t user_engine_len;
char user_public[SNMP_ADM_STR32_SIZ];
uint32_t user_public_len;
int32_t status;
int32_t type;
SLIST_ENTRY(usm_user) up;
};
SLIST_HEAD(usm_userlist, usm_user);
struct usm_user *usm_first_user(void);
struct usm_user *usm_next_user(struct usm_user *);
struct usm_user *usm_find_user(uint8_t *, uint32_t, char *);
struct usm_user *usm_new_user(uint8_t *, uint32_t, char *);
void usm_delete_user(struct usm_user *);
void usm_flush_users(void);
/* USM user for current packet */
extern struct usm_user *usm_user;
/*
* SNMP View-based Access Control Model data. Modified via the snmp_vacm(3) module.
*/
struct vacm_group;
struct vacm_user {
/* Security user name from USM */
char secname[SNMP_ADM_STR32_SIZ];
int32_t sec_model;
/* Back pointer to user assigned group name */
struct vacm_group *group;
int32_t type;
int32_t status;
SLIST_ENTRY(vacm_user) vvu;
SLIST_ENTRY(vacm_user) vvg;
};
SLIST_HEAD(vacm_userlist, vacm_user);
struct vacm_group {
char groupname[SNMP_ADM_STR32_SIZ];
struct vacm_userlist group_users;
SLIST_ENTRY(vacm_group) vge;
};
SLIST_HEAD(vacm_grouplist, vacm_group);
struct vacm_access {
/* The group name is index, not a column in the table */
struct vacm_group *group;
char ctx_prefix[SNMP_ADM_STR32_SIZ];
int32_t sec_model;
int32_t sec_level;
int32_t ctx_match;
struct vacm_view *read_view;
struct vacm_view *write_view;
struct vacm_view *notify_view;
int32_t type;
int32_t status;
TAILQ_ENTRY(vacm_access) vva;
};
TAILQ_HEAD(vacm_accesslist, vacm_access);
struct vacm_view {
char viewname[SNMP_ADM_STR32_SIZ]; /* key */
struct asn_oid subtree; /* key */
uint8_t mask[16];
uint8_t exclude;
int32_t type;
int32_t status;
SLIST_ENTRY(vacm_view) vvl;
};
SLIST_HEAD(vacm_viewlist, vacm_view);
struct vacm_context {
/* The ID of the module that registered this context */
int32_t regid;
char ctxname[SNMP_ADM_STR32_SIZ];
SLIST_ENTRY(vacm_context) vcl;
};
SLIST_HEAD(vacm_contextlist, vacm_context);
void vacm_groups_init(void);
struct vacm_user *vacm_first_user(void);
struct vacm_user *vacm_next_user(struct vacm_user *);
struct vacm_user *vacm_new_user(int32_t, char *);
int vacm_delete_user(struct vacm_user *);
int vacm_user_set_group(struct vacm_user *, u_char *, u_int);
struct vacm_access *vacm_first_access_rule(void);
struct vacm_access *vacm_next_access_rule(struct vacm_access *);
struct vacm_access *vacm_new_access_rule(char *, char *, int32_t, int32_t);
int vacm_delete_access_rule(struct vacm_access *);
struct vacm_view *vacm_first_view(void);
struct vacm_view *vacm_next_view(struct vacm_view *);
struct vacm_view *vacm_new_view(char *, struct asn_oid *);
int vacm_delete_view(struct vacm_view *);
struct vacm_context *vacm_first_context(void);
struct vacm_context *vacm_next_context(struct vacm_context *);
struct vacm_context *vacm_add_context(char *, int32_t);
void vacm_flush_contexts(int32_t);
/*
* RFC 3413 SNMP Management Target & Notification MIB
*/
struct snmpd_target_stats {
uint32_t unavail_contexts;
uint32_t unknown_contexts;
};
#define SNMP_UDP_ADDR_SIZ 6
#define SNMP_TAG_SIZ (255 + 1)
struct target_address {
char name[SNMP_ADM_STR32_SIZ];
uint8_t address[SNMP_UDP_ADDR_SIZ];
int32_t timeout;
int32_t retry;
char taglist[SNMP_TAG_SIZ];
char paramname[SNMP_ADM_STR32_SIZ];
int32_t type;
int32_t socket;
int32_t status;
SLIST_ENTRY(target_address) ta;
};
SLIST_HEAD(target_addresslist, target_address);
struct target_param {
char name[SNMP_ADM_STR32_SIZ];
int32_t mpmodel;
int32_t sec_model;
char secname[SNMP_ADM_STR32_SIZ];
enum snmp_usm_level sec_level;
int32_t type;
int32_t status;
SLIST_ENTRY(target_param) tp;
};
SLIST_HEAD(target_paramlist, target_param);
struct target_notify {
char name[SNMP_ADM_STR32_SIZ];
char taglist[SNMP_TAG_SIZ];
int32_t notify_type;
int32_t type;
int32_t status;
SLIST_ENTRY(target_notify) tn;
};
SLIST_HEAD(target_notifylist, target_notify);
extern struct snmpd_target_stats snmpd_target_stats;
struct snmpd_target_stats *bsnmpd_get_target_stats(void);
struct target_address *target_first_address(void);
struct target_address *target_next_address(struct target_address *);
struct target_address *target_new_address(char *);
int target_activate_address(struct target_address *);
int target_delete_address(struct target_address *);
struct target_param *target_first_param(void);
struct target_param *target_next_param(struct target_param *);
struct target_param *target_new_param(char *);
int target_delete_param(struct target_param *);
struct target_notify *target_first_notify(void);
struct target_notify *target_next_notify(struct target_notify *);
struct target_notify *target_new_notify(char *);
int target_delete_notify (struct target_notify *);
void target_flush_all(void);
/*
* Well known OIDs
*/
extern const struct asn_oid oid_zeroDotZero;
/* SNMPv3 Engine Discovery */
extern const struct asn_oid oid_usmUnknownEngineIDs;
extern const struct asn_oid oid_usmNotInTimeWindows;
/*
* Request ID ranges.
*
* A module can request a range of request ids and associate them with a
* type field. All ranges are deleted if a module is unloaded.
*/
u_int reqid_allocate(int size, struct lmodule *);
int32_t reqid_next(u_int type);
int32_t reqid_base(u_int type);
int reqid_istype(int32_t reqid, u_int type);
u_int reqid_type(int32_t reqid);
/*
* Timers.
*/
void *timer_start(u_int, void (*)(void *), void *, struct lmodule *);
void *timer_start_repeat(u_int, u_int, void (*)(void *), void *,
struct lmodule *);
void timer_stop(void *);
/*
* File descriptors
*/
void *fd_select(int, void (*)(int, void *), void *, struct lmodule *);
void fd_deselect(void *);
void fd_suspend(void *);
int fd_resume(void *);
/*
* Object resources
*/
u_int or_register(const struct asn_oid *, const char *, struct lmodule *);
void or_unregister(u_int);
/*
* Buffers
*/
void *buf_alloc(int tx);
size_t buf_size(int tx);
/* decode PDU and find community */
enum snmpd_input_err snmp_input_start(const u_char *, size_t, const char *,
struct snmp_pdu *, int32_t *, size_t *);
/* process the pdu. returns either _OK or _FAILED */
enum snmpd_input_err snmp_input_finish(struct snmp_pdu *, const u_char *,
size_t, u_char *, size_t *, const char *, enum snmpd_input_err, int32_t,
void *);
void snmp_output(struct snmp_pdu *, u_char *, size_t *, const char *);
void snmp_send_port(void *, const struct asn_oid *, struct snmp_pdu *,
const struct sockaddr *, socklen_t);
enum snmp_code snmp_pdu_auth_access(struct snmp_pdu *, int32_t *);
/* sending traps */
void snmp_send_trap(const struct asn_oid *, ...);
/*
* Action support
*/
int string_save(struct snmp_value *, struct snmp_context *, ssize_t, u_char **);
void string_commit(struct snmp_context *);
void string_rollback(struct snmp_context *, u_char **);
int string_get(struct snmp_value *, const u_char *, ssize_t);
int string_get_max(struct snmp_value *, const u_char *, ssize_t, size_t);
void string_free(struct snmp_context *);
int ip_save(struct snmp_value *, struct snmp_context *, u_char *);
void ip_rollback(struct snmp_context *, u_char *);
void ip_commit(struct snmp_context *);
int ip_get(struct snmp_value *, u_char *);
int oid_save(struct snmp_value *, struct snmp_context *, struct asn_oid *);
void oid_rollback(struct snmp_context *, struct asn_oid *);
void oid_commit(struct snmp_context *);
int oid_get(struct snmp_value *, const struct asn_oid *);
int index_decode(const struct asn_oid *oid, u_int sub, u_int code, ...);
int index_compare(const struct asn_oid *, u_int, const struct asn_oid *);
int index_compare_off(const struct asn_oid *, u_int, const struct asn_oid *,
u_int);
void index_append(struct asn_oid *, u_int, const struct asn_oid *);
void index_append_off(struct asn_oid *, u_int, const struct asn_oid *, u_int);
#endif