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RFC2578 section 7.1 specifies the ranges and in the case of opaque the
format to which the values need to adhere. Implement checks, so that we
don't send illegal values to the client.

OK tb@

/*	$OpenBSD: snmp.h,v 1.21 2024/02/08 17:34:09 martijn Exp $	*/

/*
 * 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>

/*
 * SNMP IMSG interface
 */

#define SNMP_MAX_OID_STRLEN	128	/* max size of the OID _string_ */

enum snmp_type {
	SNMP_IPADDR		= 0,
	SNMP_COUNTER32		= 1,
	SNMP_GAUGE32		= 2,
	SNMP_UNSIGNED32		= 2,
	SNMP_TIMETICKS		= 3,
	SNMP_OPAQUE		= 4,
	SNMP_NSAPADDR		= 5,
	SNMP_COUNTER64		= 6,
	SNMP_UINTEGER32		= 7,

	SNMP_INTEGER32		= 100,
	SNMP_BITSTRING		= 101,
	SNMP_OCTETSTRING	= 102,
	SNMP_NULL		= 103,
	SNMP_OBJECT		= 104
};

enum snmp_imsg_ctl {
	IMSG_SNMP_DUMMY		= 1000,	/* something that works everywhere */
	IMSG_SNMP_ELEMENT,
	IMSG_SNMP_END,
	IMSG_SNMP_LOCK,			/* enable restricted mode */
};

struct snmp_imsg_hdr {
	u_int32_t	 imsg_type;
	u_int16_t	 imsg_len;
	u_int16_t	 imsg_flags;
	u_int32_t	 imsg_peerid;
	u_int32_t	 imsg_pid;
};

struct snmp_imsg {
	char		 snmp_oid[SNMP_MAX_OID_STRLEN];
	u_int8_t	 snmp_type;
	u_int16_t	 snmp_len;
};

/*
 * SNMP BER types
 */

enum snmp_version {
	SNMP_V1			= 0,
	SNMP_V2			= 1,	/* SNMPv2c */
	SNMP_V3			= 3
};

enum snmp_pdutype {
	SNMP_C_GETREQ		= 0,
	SNMP_C_GETNEXTREQ	= 1,
	SNMP_C_RESPONSE		= 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_varbindtype {
	SNMP_V_NOSUCHOBJECT	= 0,
	SNMP_V_NOSUCHINSTANCE	= 1,
	SNMP_V_ENDOFMIBVIEW	= 2
};

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
};

#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 */

/* RFC2578 */
#define SMI_INTEGER_MIN		INT32_MIN
#define SMI_INTEGER_MAX		INT32_MAX
#define SMI_OCTETSTRING_MAX	65535
#define SMI_IPADDRESS_MAX	4
#define SMI_COUNTER32_MIN	0
#define SMI_COUNTER32_MAX	UINT32_MAX
#define SMI_GAUGE32_MIN		0
#define SMI_GAUGE32_MAX		UINT32_MAX
#define SMI_TIMETICKS_MIN	0
#define SMI_TIMETICKS_MAX	UINT32_MAX


#endif /* SNMPD_SNMP_H */