C# SNMP代理-表示MIB中的复杂类型

Question

我正在用C#编写我的第一个SNMP代理，我想通过SNMP请求公开一些系统事件信息。

在C#方面，所有系统事件都由一个简单的类表示：

public class MySystemEvent  
{  
    public int Id { get;set; }
    public string Message { get; set; }
    public DateTime Occurred { get; set; }
}

我希望将这些特定事件(由事件id确定)公开为MIB中的一个单独的节点，但不完全确定如何创建与上述类相对应的自定义ASN.1复杂类型。我知道我可以用序列来表示这些，但不确定我是否正确地使用了它们。

我到目前为止所做的事：

enterprise OBJECT IDENTIFIER       ::= { private 1 }
penNode OBJECT IDENTIFIER          ::= { enterprise <PEN> }
customSystemNode OBJECT IDENTIFIER ::= { penNode 1 }
events OBJECT IDENTIFIER           ::= { customSystemNode 1 }

Event ::= SEQUENCE {
    id Integer32,
    message DisplayString,
    occurred DateAndTime
}

firstSpecificEvent OBJECT-TYPE
    SYNTAX Event
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "First specific event."
    INDEX { eventId }
    ::= { events 1 }

eventId OBJECT-TYPE
    SYNTAX Integer32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Event Id."
    ::= { firstSpecificEvent 1 }

eventMessage OBJECT-TYPE
    SYNTAX DisplayString
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Event message."
    ::= { firstSpecificEvent 2 }

eventOccurred OBJECT-TYPE
    SYNTAX DateAndTime
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Event occurred."
    ::= { firstSpecificEvent 3 }

上面的MIB定义了以下树：

• 私有
  • 企业
  • penNode

    - customSystemNode  
    - events

        - firstSpecificEvent 
            - eventId
            - eventMessage
            - eventOccurred

​

​

​

​

我想要添加的是具有相同结构的多个其他事件到" events“节点，例如，就在我希望拥有的firstSpecificEvent之后：

• secondSpecificEvent
  • eventId
  • eventMessage
  • eventOccurred

​

如何在不为每个特定事件添加单独的eventId、eventMessage和eventOccurred对象类型定义的情况下做到这一点？是否可以定义允许以下内容的CustomEventComplexType？

firstSpecificEvent OBJECT-TYPE
    SYNTAX CustomEventComplexType
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "First specific event."
    ::= { events 1 }

secondSpecificEvent OBJECT-TYPE
    SYNTAX CustomEventComplexType
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Second specific event."
    ::= { events 2 }

thirdSpecificEvent OBJECT-TYPE
    SYNTAX CustomEventComplexType
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Third specific event."
    ::= { events 3 }

etc.

Answer 1

我最终解决了这个问题，就像列克李建议的那样，创建了一个事件表。这样，对于行条目的定义，只需要一次对象类型定义。

enterprise OBJECT IDENTIFIER       ::= { private 1 }
penNode OBJECT IDENTIFIER          ::= { enterprise <PEN> }
customSystemNode OBJECT IDENTIFIER ::= { penNode 1 }

Event ::= SEQUENCE {
    id Integer32,
    message DisplayString,
    occurred DateAndTime
}

eventTable OBJECT-TYPE
    SYNTAX SEQUENCE OF Event
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Table containing event information."
    ::= { customSystemNode 1 }

eventTableRowEntry OBJECT-TYPE
    SYNTAX Event
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "A row entry in the event table."
    INDEX { eventId }
    ::= { eventTable 1 }

eventId OBJECT-TYPE
    SYNTAX Integer32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Event id."
    ::= { eventTableRowEntry 1 }

eventMessage OBJECT-TYPE
    SYNTAX DisplayString
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Event message."
    ::= { eventTableRowEntry 2 }

eventOccurred OBJECT-TYPE
    SYNTAX DateAndTime
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
        "Event occurred timestamp."
    ::= { eventTableRowEntry 3 }