SNMP Manager Programmer's Guide

Using Header Files, Data Structures, and Defines

SNMP Manager Programmer’s Guide–134249

4-7

Unencoded-Packet Structure (SNMP_PKT_T)

vb_obj_id

is the OID of the variable binding.

vb_data_flags_n_type

describes the class form and data type of the variable binding. The

following Manager Services defines describe values for this field:

#define VT_NUMBER A_INTEGER

#define VT_STRING A_OCTETSTRING

#define VT_OBJECT A_OBJECTID

#define VT_EMPTY A_NULL

#define VT_IPADDRESS (A_APPLICATION | 0)

#define VT_COUNTER (A_APPLICATION | 1)

#define VT_GAUGE (A_APPLICATION | 2)

#define VT_TIMETICKS (A_APPLICATION | 3)

#define VT_OPAQUE (A_APPLICATION | 4)

#define VT_NSAPADDRESS (A_APPLICATION | 5)

#define VT_UINTEGER32 (A_APPLICATION | 7)

vb_data_length

is the number of bytes in the encoded variable binding value.

value_u

is a tagged union capable of holding values for all the data types

described in RFC 1155. The variable binding’s value is assigned to one

of the fields depending on its type:

v_number holds signed integer values.

v_counter holds unsigned integer values.

v_string holds octet string values.

v_object holds OIDs.

v_network_address[4] holds network addresses.

trap_pdu

is a structure for holding a trap PDU. This structure contains six fields:

enterprise_objid

is an OID identifying the trap originator.

net_address[4]

is the IP address of the trap originator.