423 lines
12 KiB
C
423 lines
12 KiB
C
/*
|
|
* Copyright (c) 2001-2003
|
|
* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
|
|
* All rights reserved.
|
|
*
|
|
* Author: Harti Brandt <harti@freebsd.org>
|
|
*
|
|
* 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 1.31 2005/10/04 13:30:36 brandt_h Exp $
|
|
*
|
|
* SNMP daemon data and functions exported to modules.
|
|
*/
|
|
#ifndef snmpmod_h_
|
|
#define snmpmod_h_
|
|
|
|
#include <sys/types.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;
|
|
|
|
/*
|
|
* Well known OIDs
|
|
*/
|
|
extern const struct asn_oid oid_zeroDotZero;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/* 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);
|
|
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
|