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/* $OpenBSD: snmp.h,v 1.7 2020/01/17 09:52:44 martijn Exp $ */
/*
* Copyright (c) 2019 Martijn van Duren <martijn@openbsd.org>
* Copyright (c) 2007, 2008, 2012 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef SNMPD_SNMP_H
#define SNMPD_SNMP_H
#include <sys/types.h>
#include <sys/queue.h>
#include <endian.h>
#include <time.h>
#define READ_BUF_SIZE 65535
#define SNMP_MAX_OID_STRLEN 128 /* max size of the OID _string_ */
/*
* SNMP BER types
*/
enum snmp_version {
SNMP_V1 = 0,
SNMP_V2C = 1, /* SNMPv2c */
SNMP_V3 = 3
};
enum snmp_context {
SNMP_C_GETREQ = 0,
SNMP_C_GETNEXTREQ = 1,
SNMP_C_GETRESP = 2,
SNMP_C_SETREQ = 3,
SNMP_C_TRAP = 4,
/* SNMPv2 */
SNMP_C_GETBULKREQ = 5,
SNMP_C_INFORMREQ = 6,
SNMP_C_TRAPV2 = 7,
SNMP_C_REPORT = 8
};
enum snmp_application {
SNMP_T_IPADDR = 0,
SNMP_T_COUNTER32 = 1,
SNMP_T_GAUGE32 = 2,
SNMP_T_UNSIGNED32 = 2,
SNMP_T_TIMETICKS = 3,
SNMP_T_OPAQUE = 4,
SNMP_T_NSAPADDR = 5,
SNMP_T_COUNTER64 = 6,
SNMP_T_UINTEGER32 = 7
};
enum snmp_generic_trap {
SNMP_TRAP_COLDSTART = 0,
SNMP_TRAP_WARMSTART = 1,
SNMP_TRAP_LINKDOWN = 2,
SNMP_TRAP_LINKUP = 3,
SNMP_TRAP_AUTHFAILURE = 4,
SNMP_TRAP_EGPNEIGHLOSS = 5,
SNMP_TRAP_ENTERPRISE = 6
};
enum snmp_error {
SNMP_ERROR_NONE = 0,
SNMP_ERROR_TOOBIG = 1,
SNMP_ERROR_NOSUCHNAME = 2,
SNMP_ERROR_BADVALUE = 3,
SNMP_ERROR_READONLY = 4,
SNMP_ERROR_GENERR = 5,
/* SNMPv2 */
SNMP_ERROR_NOACCESS = 6,
SNMP_ERROR_WRONGTYPE = 7,
SNMP_ERROR_WRONGLENGTH = 8,
SNMP_ERROR_WRONGENC = 9,
SNMP_ERROR_WRONGVALUE = 10,
SNMP_ERROR_NOCREATION = 11,
SNMP_ERROR_INCONVALUE = 12,
SNMP_ERROR_RESUNAVAIL = 13, /* EGAIN */
SNMP_ERROR_COMMITFAILED = 14,
SNMP_ERROR_UNDOFAILED = 15,
SNMP_ERROR_AUTHERROR = 16,
SNMP_ERROR_NOTWRITABLE = 17,
SNMP_ERROR_INCONNAME = 18
};
enum snmp_security_model {
SNMP_SEC_ANY = 0,
SNMP_SEC_SNMPv1 = 1,
SNMP_SEC_SNMPv2c = 2,
SNMP_SEC_USM = 3,
SNMP_SEC_TSM = 4
};
enum snmp_application_exception {
SNMP_E_NOSUCHOBJECT = 0,
SNMP_E_NOSUCHINSTANCE = 1,
SNMP_E_ENDOFMIB = 2
};
struct snmp_agent;
struct snmp_sec {
enum snmp_security_model model;
int (*init)(struct snmp_agent *);
char *(*genparams)(struct snmp_agent *, size_t *, void **);
struct ber_element *(*encpdu)(struct snmp_agent *,
struct ber_element *, void *);
int (*finalparams)(struct snmp_agent *, char *, size_t, size_t, void *);
int (*parseparams)(struct snmp_agent *, char *, size_t, off_t, char *,
size_t, uint8_t, void **);
struct ber_element *(*decpdu)(struct snmp_agent *, char *, size_t,
void *);
void (*free)(void *);
void (*freecookie)(void *);
void *data;
};
struct snmp_v3 {
uint8_t level;
char *ctxname;
size_t ctxnamelen;
int engineidset;
char *engineid;
size_t engineidlen;
struct snmp_sec *sec;
};
struct snmp_agent {
int fd;
int timeout;
int retries;
enum snmp_version version;
/* SNMP_V1 & SNMP_V2C */
char *community;
/* SNMP_V3 */
struct snmp_v3 *v3;
};
#define SNMP_MSGFLAG_AUTH 0x01
#define SNMP_MSGFLAG_PRIV 0x02
#define SNMP_MSGFLAG_SECMASK (SNMP_MSGFLAG_AUTH | SNMP_MSGFLAG_PRIV)
#define SNMP_MSGFLAG_REPORT 0x04
#define SNMP_MAX_TIMEWINDOW 150 /* RFC3414 */
struct snmp_v3 *snmp_v3_init(int, const char *, size_t, struct snmp_sec *);
int snmp_v3_setengineid(struct snmp_v3 *, char *, size_t);
struct snmp_agent *snmp_connect_v12(int, enum snmp_version, const char *);
struct snmp_agent *snmp_connect_v3(int, struct snmp_v3 *);
void snmp_free_agent(struct snmp_agent *);
struct ber_element *
snmp_get(struct snmp_agent *agent, struct ber_oid *oid, size_t len);
struct ber_element *snmp_getnext(struct snmp_agent *, struct ber_oid *, size_t);
struct ber_element *
snmp_getbulk(struct snmp_agent *, struct ber_oid *, size_t, int, int);
struct ber_element *snmp_set(struct snmp_agent *, struct ber_element *);
int snmp_trap(struct snmp_agent *, struct timespec *, struct ber_oid *,
struct ber_element *);
ssize_t ber_copy_writebuf(struct ber *, void **);
#endif /* SNMPD_SNMP_H */
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