snmp_api.h

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	 */
    u_char  *community;	        /* community for outgoing requests. */
    size_t  community_len;      /* Length of community name. */

	/*
	 * SNMPv3 fields
	 */
    u_char  *contextEngineID;	/* authoritative snmpEngineID */
    size_t  contextEngineIDLen; /* Length of contextEngineID */
    u_int   engineBoots;        /* initial engineBoots for remote engine */
    u_int   engineTime;         /* initial engineTime for remote engine */
    char    *contextName;	/* authoritative contextName */
    size_t  contextNameLen;     /* Length of contextName */
    u_char  *securityEngineID;	/* authoritative snmpEngineID */
    size_t  securityEngineIDLen;  /* Length of contextEngineID */
    char    *securityName;	/* on behalf of this principal */
    size_t  securityNameLen;    /* Length of securityName. */
    oid     *securityAuthProto; /* auth protocol oid */
    size_t  securityAuthProtoLen; /* Length of auth protocol oid */
    u_char  securityAuthKey[USM_AUTH_KU_LEN];  /* Ku for auth protocol XXX */
    size_t  securityAuthKeyLen; /* Length of Ku for auth protocol */
    oid     *securityPrivProto; /* priv protocol oid */
    size_t  securityPrivProtoLen; /* Length of priv protocol oid */
    u_char  securityPrivKey[USM_PRIV_KU_LEN];  /* Ku for privacy protocol XXX */
    size_t  securityPrivKeyLen; /* Length of Ku for priv protocol */
    int	    securityModel;
    int	    securityLevel;  /* noAuthNoPriv, authNoPriv, authPriv */
};

/*
 * A list of all the outstanding requests for a particular session.
 */
#ifdef SNMP_NEED_REQUEST_LIST
struct request_list {
    struct request_list *next_request;
    long  request_id;	/* request id */
    long  message_id;	/* message id */
    snmp_callback callback; /* user callback per request (NULL if unused) */
    void   *cb_data;   /* user callback data per request (NULL if unused) */
    int	    retries;	/* Number of retries */
    u_long timeout;	/* length to wait for timeout */
    struct timeval time; /* Time this request was made */
    struct timeval expire;  /* time this request is due to expire */
    struct  snmp_session *session;
    struct snmp_pdu *pdu;   /* The pdu for this request
			       (saved so it can be retransmitted */
};
#endif /* SNMP_NEED_REQUEST_LIST */

/*
 * Set fields in session and pdu to the following to get a default or unconfigured value.
 */
#define SNMP_DEFAULT_COMMUNITY_LEN  0	/* to get a default community name */
#define SNMP_DEFAULT_RETRIES	    -1
#define SNMP_DEFAULT_TIMEOUT	    -1
#define SNMP_DEFAULT_REMPORT	    0
#define SNMP_DEFAULT_REQID	    -1
#define SNMP_DEFAULT_MSGID	    -1
#define SNMP_DEFAULT_ERRSTAT	    -1
#define SNMP_DEFAULT_ERRINDEX	    -1
#define SNMP_DEFAULT_ADDRESS	    0
#define SNMP_DEFAULT_PEERNAME	    NULL
#define SNMP_DEFAULT_ENTERPRISE_LENGTH	0
#define SNMP_DEFAULT_TIME	    0
#define SNMP_DEFAULT_VERSION	    -1
#define SNMP_DEFAULT_CONTEXT        ""
#define SNMP_DEFAULT_AUTH_PROTO     usmHMACMD5AuthProtocol
#define SNMP_DEFAULT_AUTH_PROTOLEN  USM_LENGTH_OID_TRANSFORM
#define SNMP_DEFAULT_PRIV_PROTO     usmDESPrivProtocol
#define SNMP_DEFAULT_PRIV_PROTOLEN  USM_LENGTH_OID_TRANSFORM

extern const char *snmp_api_errstring (int);
extern void snmp_perror (const char *);
extern void snmp_set_detail (const char *);

#define SNMP_MAX_MSG_SIZE          1472 /* ethernet MTU minus IP/UDP header */
#define SNMP_MAX_ENG_SIZE          32
#define SNMP_MAX_SEC_NAME_SIZE     256
#define SNMP_MAX_SEC_NAME_SIZE     256
#define SNMP_MAX_CONTEXT_SIZE      256
#define SNMP_SEC_PARAM_BUF_SIZE     256

/* set to one to ignore unauthenticated Reports */
#define SNMPV3_IGNORE_UNAUTH_REPORTS 0
/* to determine type of Report from varbind_list */
#define REPORT_STATS_LEN 9
#define REPORT_snmpUnknownSecurityModels_NUM 1
#define REPORT_snmpInvalidMsgs_NUM 2
#define REPORT_usmStatsUnsupportedSecLevels_NUM 1
#define REPORT_usmStatsNotInTimeWindows_NUM 2
#define REPORT_usmStatsUnknownUserNames_NUM 3
#define REPORT_usmStatsUnknownEngineIDs_NUM 4 
#define REPORT_usmStatsWrongDigests_NUM 5
#define REPORT_usmStatsDecryptionErrors_NUM 6

#define SNMP_DETAIL_SIZE        512

#define SNMP_FLAGS_DONT_PROBE      0x100    /* don't probe for an engineID */
#define SNMP_FLAGS_STREAM_SOCKET   0x80
#define SNMP_FLAGS_LISTENING       0x40     /* Server stream sockets only */
#define SNMP_FLAGS_SUBSESSION      0x20

/*
 * Error return values.
 *
 * SNMPERR_SUCCESS is the non-PDU "success" code.
 *
 * XXX	These should be merged with SNMP_ERR_* defines and confined
 *	to values < 0.  ???
 */
#define SNMPERR_SUCCESS			(0)  /* XXX  Non-PDU "success" code. */
#define SNMPERR_GENERR			(-1)
#define SNMPERR_BAD_LOCPORT		(-2)
#define SNMPERR_BAD_ADDRESS		(-3)
#define SNMPERR_BAD_SESSION		(-4)
#define SNMPERR_TOO_LONG		(-5)
#define SNMPERR_NO_SOCKET		(-6)
#define SNMPERR_V2_IN_V1		(-7)
#define SNMPERR_V1_IN_V2		(-8)
#define SNMPERR_BAD_REPEATERS		(-9)
#define SNMPERR_BAD_REPETITIONS		(-10)
#define SNMPERR_BAD_ASN1_BUILD		(-11)
#define SNMPERR_BAD_SENDTO		(-12)
#define SNMPERR_BAD_PARSE		(-13)
#define SNMPERR_BAD_VERSION		(-14)
#define SNMPERR_BAD_SRC_PARTY		(-15)
#define SNMPERR_BAD_DST_PARTY		(-16)
#define SNMPERR_BAD_CONTEXT		(-17)
#define SNMPERR_BAD_COMMUNITY		(-18)
#define SNMPERR_NOAUTH_DESPRIV		(-19)
#define SNMPERR_BAD_ACL			(-20)
#define SNMPERR_BAD_PARTY		(-21)
#define SNMPERR_ABORT			(-22)
#define SNMPERR_UNKNOWN_PDU		(-23)
#define SNMPERR_TIMEOUT 		(-24)
#define SNMPERR_BAD_RECVFROM 		(-25)
#define SNMPERR_BAD_ENG_ID 		(-26)
#define SNMPERR_BAD_SEC_NAME 		(-27)
#define SNMPERR_BAD_SEC_LEVEL 		(-28)
#define SNMPERR_ASN_PARSE_ERR           (-29)
#define SNMPERR_UNKNOWN_SEC_MODEL 	(-30)
#define SNMPERR_INVALID_MSG             (-31)
#define SNMPERR_UNKNOWN_ENG_ID          (-32)
#define SNMPERR_UNKNOWN_USER_NAME 	(-33)
#define SNMPERR_UNSUPPORTED_SEC_LEVEL 	(-34)
#define SNMPERR_AUTHENTICATION_FAILURE 	(-35)
#define SNMPERR_NOT_IN_TIME_WINDOW 	(-36)
#define SNMPERR_DECRYPTION_ERR          (-37)
#define SNMPERR_SC_GENERAL_FAILURE	(-38)
#define SNMPERR_SC_NOT_CONFIGURED	(-39)
#define SNMPERR_KT_NOT_AVAILABLE	(-40)
#define SNMPERR_UNKNOWN_REPORT          (-41)
#define SNMPERR_USM_GENERICERROR		(-42)
#define SNMPERR_USM_UNKNOWNSECURITYNAME		(-43)
#define SNMPERR_USM_UNSUPPORTEDSECURITYLEVEL	(-44)
#define SNMPERR_USM_ENCRYPTIONERROR		(-45)
#define SNMPERR_USM_AUTHENTICATIONFAILURE	(-46)
#define SNMPERR_USM_PARSEERROR			(-47)
#define SNMPERR_USM_UNKNOWNENGINEID		(-48)
#define SNMPERR_USM_NOTINTIMEWINDOW		(-49)
#define SNMPERR_USM_DECRYPTIONERROR		(-50)
#define SNMPERR_NOMIB			(-51)
#define SNMPERR_RANGE			(-52)
#define SNMPERR_MAX_SUBID		(-53)
#define SNMPERR_BAD_SUBID		(-54)
#define SNMPERR_LONG_OID		(-55)
#define SNMPERR_BAD_NAME		(-56)
#define SNMPERR_VALUE			(-57)
#define SNMPERR_UNKNOWN_OBJID		(-58)
#define SNMPERR_NULL_PDU		(-59)
#define SNMPERR_NO_VARS			(-60)
#define SNMPERR_VAR_TYPE		(-61)
#define SNMPERR_MALLOC			(-62)

#define SNMPERR_MAX			(-62)

#define non_repeaters	errstat
#define max_repetitions errindex


struct variable_list {
    struct variable_list *next_variable;    /* NULL for last variable */
    oid	    *name;  /* Object identifier of variable */
    size_t  name_length;    /* number of subid's in name */
    u_char  type;   /* ASN type of variable */
    union { /* value of variable */
	long	*integer;
	u_char	*string;
	oid	*objid;
	u_char  *bitstring;
	struct counter64 *counter64;
#ifdef OPAQUE_SPECIAL_TYPES
	float   *floatVal;
	double	*doubleVal;
/*	t_union *unionVal; */
#endif /* OPAQUE_SPECIAL_TYPES */
    } val;
    size_t	    val_len;
    oid name_loc[MAX_OID_LEN];  /* 90 percentile < 24. */
    u_char buf[40];             /* 90 percentile < 40. */
};



/*
 * struct snmp_session *snmp_open(session)
 *	struct snmp_session *session;
 *
 * Sets up the session with the snmp_session information provided
 * by the user.  Then opens and binds the necessary UDP port.
 * A handle to the created session is returned (this is different than
 * the pointer passed to snmp_open()).  On any error, NULL is returned
 * and snmp_errno is set to the appropriate error code.
 */
struct snmp_session *snmp_open (struct snmp_session *);

/*
 * int snmp_close(session)
 *     struct snmp_session *session;
 *
 * Close the input session.  Frees all data allocated for the session,
 * dequeues any pending requests, and closes any sockets allocated for
 * the session.  Returns 0 on error, 1 otherwise.
 *
 * snmp_close_sessions() does the same thing for all open sessions
 */
int snmp_close (struct snmp_session *);
int snmp_close_sessions (void);


/*
 * int snmp_send(session, pdu)
 *     struct snmp_session *session;
 *     struct snmp_pdu	*pdu;
 *
 * Sends the input pdu on the session after calling snmp_build to create
 * a serialized packet.  If necessary, set some of the pdu data from the
 * session defaults.  Add a request corresponding to this pdu to the list
 * of outstanding requests on this session, then send the pdu.
 * Returns the request id of the generated packet if applicable, otherwise 1.
 * On any error, 0 is returned.
 * The pdu is freed by snmp_send() unless a failure occured.
 */
int snmp_send (struct snmp_session *, struct snmp_pdu *);

/*
 * int snmp_async_send(session, pdu, callback, cb_data)
 *     struct snmp_session *session;
 *     struct snmp_pdu	*pdu;
 *     snmp_callback callback;
 *     void   *cb_data;
 *
 * Sends the input pdu on the session after calling snmp_build to create
 * a serialized packet.  If necessary, set some of the pdu data from the
 * session defaults.  Add a request corresponding to this pdu to the list
 * of outstanding requests on this session and store callback and data,
 * then send the pdu.
 * Returns the request id of the generated packet if applicable, otherwise 1.
 * On any error, 0 is returned.
 * The pdu is freed by snmp_send() unless a failure occured.
 */
int snmp_async_send (struct snmp_session *, struct snmp_pdu *, 
                         snmp_callback, void *);


/*
 * void snmp_read(fdset)
 *     fd_set  *fdset;
 *
 * Checks to see if any of the fd's set in the fdset belong to
 * snmp.  Each socket with it's fd set has a packet read from it
 * and snmp_parse is called on the packet received.  The resulting pdu
 * is passed to the callback routine for that session.  If the callback
 * routine returns successfully, the pdu and it's request are deleted.
 */
void snmp_read (fd_set *);



/*
 * void
 * snmp_free_pdu(pdu)
 *     struct snmp_pdu *pdu;
 *
 * Frees the pdu and any malloc'd data associated with it.
 */