#ifndef SNMP_H
#define SNMP_H

#ifdef __cplusplus
extern          "C" {
#endif
    /*
     * Definitions for the Simple Network Management Protocol (RFC 1067).
     *
     *
     */
/***********************************************************
	Copyright 1988, 1989 by Carnegie Mellon University

                      All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the name of CMU not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

CMU DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
CMU BE LIABLE FOR ANY SPECIAL, 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.
******************************************************************/


#define SNMP_PORT	    161 /* standard UDP port for SNMP agents
                                 * to receive requests messages */
#define SNMP_TRAP_PORT	    162 /* standard UDP port for SNMP
                                 * managers to receive notificaion
                                 * (trap and inform) messages */

#define SNMP_MAX_LEN	    1500        /* typical maximum message size */
#define SNMP_MIN_MAX_LEN    484 /* minimum maximum message size */

    /*
     * SNMP versions 
     */
    /*
     * There currently exists the following SNMP versions.
     * * (Note that only SNMPv1 is in widespread usage, and this code supports
     * *  only SNMPv1, SNMPv2c, and SNMPv3.
     * *
     * *  SNMPv1 - (full) the original version, defined by RFC 1157
     * *  SNMPsec - (historic) the first attempt to add strong security
     * *             to SNMPv1, defined by RFCs 1351, 1352, and 1353.
     * *  SNMPv2p - (historic) party-based SNMP, which was another
     * *             attempt to add strong security to SNMP, defined
     * *             by RFCs 1441, 1445, 1446, 1448, and 1449.
     * *  SNMPv2c - (experimental) community string-based SNMPv2,
     * *             which was an attempt to combine the protocol
     * *             operations of SNMPv2 with the security of
     * *             SNMPv1, defined by RFCs 1901, 1905, and 1906.
     * *  SNMPv2u - (experimental) user-based SNMPv2, which provided
     * *             security based on user names and protocol
     * *             operations of SNMPv2, defined by RFCs 1905,
     * *             1909, and 1910.
     * *  SNMPv2* (or SNMPv2star) - (experimental) an attempt to add the
     * *             best features of SNMPv2p and SNMPv2u, defined
     * *             by unpublished documents found at WEB site
     * *             owned by SNMP Research (a leading SNMP vendor)
     * *  SNMPv3 - the current attempt by the IETF working group to merge
     * *             the SNMPv2u and SNMPv2* proposals into a more widly
     * *             accepted SNMPv3.  It is defined by not yet published
     * *             documents of the IETF SNMPv3 WG.
     * *
     * * SNMPv1, SNMPv2c, SNMPv2u, and SNMPv3 messages have a common
     * * form, which is an ASN.1 sequence containing a message version 
     * * field, followed by version dependent fields.
     * * SNMPsec, SNMPv2p, and SNMPv2* messages have a common form,
     * * which is a tagged ASN.1 context specific sequence containing
     * * message dependent fields.
     * *
     * * In the #defines for the message versions below, the value
     * * for SNMPv1, SNMPv2c, SNMPv2u, and SNMPv3 messages is the
     * * value of the message version field. Since SNMPsec, SNMPv2p,
     * * and SNMPv2* messages do not have a message version field,
     * * the value in the defines for them is choosen to be a large
     * * arbitrary number.
     * *
     * * Note that many of the version ID's are defined below purely for
     * * documentational purposes.  At this point the only protocol planned
     * * for future implementations is SNMP3, as the other v2 protocols will
     * * not be supported by the IETF (ie, v2u, v2sec, v2star) or used by
     * * the snmp community at large (at the time of this writing).  
     */

    /*
     * versions based on version field 
     */
#define SNMP_VERSION_1	   0
#define SNMP_VERSION_2c    1
#define SNMP_VERSION_2u    2    /* not (will never be) supported by this code */
#define SNMP_VERSION_3     3

    /*
     * versions not based on a version field 
     */
#define SNMP_VERSION_sec   128  /* not (will never be) supported by this code */
#define SNMP_VERSION_2p	   129  /* no longer supported by this code (> 4.0) */
#define SNMP_VERSION_2star 130  /* not (will never be) supported by this code */

    /*
     * PDU types in SNMPv1, SNMPsec, SNMPv2p, SNMPv2c, SNMPv2u, SNMPv2*, and SNMPv3 
     */
#define SNMP_MSG_GET        (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x0) /* a0=160 */
#define SNMP_MSG_GETNEXT    (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x1) /* a1=161 */
#define SNMP_MSG_RESPONSE   (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x2) /* a2=162 */
#define SNMP_MSG_SET        (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x3) /* a3=163 */

    /*
     * PDU types in SNMPv1 and SNMPsec 
     */
#define SNMP_MSG_TRAP       (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x4) /* a4=164 */

    /*
     * PDU types in SNMPv2p, SNMPv2c, SNMPv2u, SNMPv2*, and SNMPv3 
     */
#define SNMP_MSG_GETBULK    (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x5) /* a5=165 */
#define SNMP_MSG_INFORM     (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x6) /* a6=166 */
#define SNMP_MSG_TRAP2      (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x7) /* a7=167 */

    /*
     * PDU types in SNMPv2u, SNMPv2*, and SNMPv3 
     */
#define SNMP_MSG_REPORT     (ASN_CONTEXT | ASN_CONSTRUCTOR | 0x8) /* a8=168 */

    /*
     * internal modes that should never be used by the protocol for the
     * pdu type.
     *
     * All modes < 128 are reserved for SET requests.
     */
#define SNMP_MSG_INTERNAL_SET_BEGIN        -1
#define SNMP_MSG_INTERNAL_SET_RESERVE1     0    /* these should match snmp.h */
#define SNMP_MSG_INTERNAL_SET_RESERVE2     1
#define SNMP_MSG_INTERNAL_SET_ACTION       2
#define SNMP_MSG_INTERNAL_SET_COMMIT       3
#define SNMP_MSG_INTERNAL_SET_FREE         4
#define SNMP_MSG_INTERNAL_SET_UNDO         5
#define SNMP_MSG_INTERNAL_SET_MAX          6

#define SNMP_MSG_INTERNAL_CHECK_VALUE           17
#define SNMP_MSG_INTERNAL_ROW_CREATE            18
#define SNMP_MSG_INTERNAL_UNDO_SETUP            19
#define SNMP_MSG_INTERNAL_SET_VALUE             20
#define SNMP_MSG_INTERNAL_CHECK_CONSISTENCY     21
#define SNMP_MSG_INTERNAL_UNDO_SET              22
#define SNMP_MSG_INTERNAL_COMMIT                23
#define SNMP_MSG_INTERNAL_UNDO_COMMIT           24
#define SNMP_MSG_INTERNAL_IRREVERSIBLE_COMMIT   25
#define SNMP_MSG_INTERNAL_UNDO_CLEANUP          26

    /*
     * modes > 128 for non sets.
     * Note that 160-168 overlap with SNMP ASN1 pdu types
     */
#define SNMP_MSG_INTERNAL_PRE_REQUEST           128
#define SNMP_MSG_INTERNAL_OBJECT_LOOKUP         129
#define SNMP_MSG_INTERNAL_POST_REQUEST          130
#define SNMP_MSG_INTERNAL_GET_STASH             131

    /*
     * test for member of Confirmed Class i.e., reportable 
     */
#define SNMP_CMD_CONFIRMED(c) (c == SNMP_MSG_INFORM || c == SNMP_MSG_GETBULK ||\
                               c == SNMP_MSG_GETNEXT || c == SNMP_MSG_GET || \
                               c == SNMP_MSG_SET)

    /*
     * Exception values for SNMPv2p, SNMPv2c, SNMPv2u, SNMPv2*, and SNMPv3 
     */
#define SNMP_NOSUCHOBJECT    (ASN_CONTEXT | ASN_PRIMITIVE | 0x0) /* 80=128 */
#define SNMP_NOSUCHINSTANCE  (ASN_CONTEXT | ASN_PRIMITIVE | 0x1) /* 81=129 */
#define SNMP_ENDOFMIBVIEW    (ASN_CONTEXT | ASN_PRIMITIVE | 0x2) /* 82=130 */

    /*
     * Error codes (the value of the field error-status in PDUs) 
     */

    /*
     * in SNMPv1, SNMPsec, SNMPv2p, SNMPv2c, SNMPv2u, SNMPv2*, and SNMPv3 PDUs 
     */
#define SNMP_ERR_NOERROR                (0)     /* XXX  Used only for PDUs? */
#define SNMP_ERR_TOOBIG	                (1)
#define SNMP_ERR_NOSUCHNAME             (2)
#define SNMP_ERR_BADVALUE               (3)
#define SNMP_ERR_READONLY               (4)
#define SNMP_ERR_GENERR	                (5)

    /*
     * in SNMPv2p, SNMPv2c, SNMPv2u, SNMPv2*, and SNMPv3 PDUs 
     */
#define SNMP_ERR_NOACCESS		(6)
#define SNMP_ERR_WRONGTYPE		(7)
#define SNMP_ERR_WRONGLENGTH		(8)
#define SNMP_ERR_WRONGENCODING		(9)
#define SNMP_ERR_WRONGVALUE		(10)
#define SNMP_ERR_NOCREATION		(11)
#define SNMP_ERR_INCONSISTENTVALUE	(12)
#define SNMP_ERR_RESOURCEUNAVAILABLE	(13)
#define SNMP_ERR_COMMITFAILED		(14)
#define SNMP_ERR_UNDOFAILED		(15)
#define SNMP_ERR_AUTHORIZATIONERROR	(16)
#define SNMP_ERR_NOTWRITABLE		(17)

    /*
     * in SNMPv2c, SNMPv2u, SNMPv2*, and SNMPv3 PDUs 
     */
#define SNMP_ERR_INCONSISTENTNAME	(18)

#define MAX_SNMP_ERR	18


    /*
     * values of the generic-trap field in trap PDUs 
     */
#define SNMP_TRAP_COLDSTART		(0)
#define SNMP_TRAP_WARMSTART		(1)
#define SNMP_TRAP_LINKDOWN		(2)
#define SNMP_TRAP_LINKUP		(3)
#define SNMP_TRAP_AUTHFAIL		(4)
#define SNMP_TRAP_EGPNEIGHBORLOSS	(5)
#define SNMP_TRAP_ENTERPRISESPECIFIC	(6)

    /*
     * row status values 
     */
#define SNMP_ROW_NONEXISTENT		0
#define SNMP_ROW_ACTIVE			1
#define SNMP_ROW_NOTINSERVICE		2
#define SNMP_ROW_NOTREADY		3
#define SNMP_ROW_CREATEANDGO		4
#define SNMP_ROW_CREATEANDWAIT		5
#define SNMP_ROW_DESTROY		6

    /*
     * row storage values 
     */
#define SNMP_STORAGE_NONE  0
#define SNMP_STORAGE_OTHER		1
#define SNMP_STORAGE_VOLATILE		2
#define SNMP_STORAGE_NONVOLATILE	3
#define SNMP_STORAGE_PERMANENT		4
#define SNMP_STORAGE_READONLY		5

    /*
     * message processing models 
     */
#define SNMP_MP_MODEL_SNMPv1		0
#define SNMP_MP_MODEL_SNMPv2c		1
#define SNMP_MP_MODEL_SNMPv2u		2
#define SNMP_MP_MODEL_SNMPv3		3
#define SNMP_MP_MODEL_SNMPv2p		256

    /*
     * security values 
     */
#define SNMP_SEC_MODEL_ANY		0
#define SNMP_SEC_MODEL_SNMPv1		1
#define SNMP_SEC_MODEL_SNMPv2c		2
#define SNMP_SEC_MODEL_USM		3
#define SNMP_SEC_MODEL_SNMPv2p		256

#define SNMP_SEC_LEVEL_NOAUTH		1
#define SNMP_SEC_LEVEL_AUTHNOPRIV	2
#define SNMP_SEC_LEVEL_AUTHPRIV		3

#define SNMP_MSG_FLAG_AUTH_BIT          0x01
#define SNMP_MSG_FLAG_PRIV_BIT          0x02
#define SNMP_MSG_FLAG_RPRT_BIT          0x04

    /*
     * control PDU handling characteristics 
     */
#define UCD_MSG_FLAG_RESPONSE_PDU            0x100
#define UCD_MSG_FLAG_EXPECT_RESPONSE         0x200
#define UCD_MSG_FLAG_FORCE_PDU_COPY          0x400
#define UCD_MSG_FLAG_ALWAYS_IN_VIEW          0x800
#define UCD_MSG_FLAG_PDU_TIMEOUT            0x1000
#define UCD_MSG_FLAG_ONE_PASS_ONLY          0x2000

    /*
     * view status 
     */
#define SNMP_VIEW_INCLUDED		1
#define SNMP_VIEW_EXCLUDED		2

    /*
     * basic oid values 
     */
#define SNMP_OID_INTERNET		1, 3, 6, 1
#define SNMP_OID_ENTERPRISES		SNMP_OID_INTERNET, 4, 1
#define SNMP_OID_MIB2			SNMP_OID_INTERNET, 2, 1
#define SNMP_OID_SNMPV2			SNMP_OID_INTERNET, 6
#define SNMP_OID_SNMPMODULES		SNMP_OID_SNMPV2, 3

    /*
     * lengths as defined by TCs 
     */
#define SNMPADMINLENGTH 255


    char           *uptime_string(u_long, char *);
    void            xdump(const u_char *, size_t, const char *);
    u_char         *snmp_parse_var_op(u_char *, oid *, size_t *, u_char *,
                                      size_t *, u_char **, size_t *);
    u_char         *snmp_build_var_op(u_char *, oid *, size_t *, u_char,
                                      size_t, u_char *, size_t *);


#ifdef USE_REVERSE_ASNENCODING
    int             snmp_realloc_rbuild_var_op(u_char ** pkt,
                                               size_t * pkt_len,
                                               size_t * offset,
                                               int allow_realloc,
                                               const oid * name,
                                               size_t * name_len,
                                               u_char value_type,
                                               u_char * value,
                                               size_t value_length);
#endif

#ifdef __cplusplus
}
#endif
#endif                          /* SNMP_H */
