Question

我在C＃中编写了我的第一个SNMP代理，我希望通过SNMP GET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; }
}

我想将这些特定事件（由事件ID确定）作为MIB中的单独节点公开，但我不完全确定如何创建与上述类对应的自定义ASN.1复杂类型。我知道我可以使用SEQUENCE来表示这些，但不确定我是否正确使用它们。

到目前为止我做了什么：

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：

私人
- 企业
- penNode
  - customSystemNode
  - 事件
    - firstSpecificEvent
      - EVENTID
      - 事件消息
      - eventOccurred

我要添加的是多个其他事件，其结构与＆＃34;事件＆＃34;相同。例如节点在我想要的第一个特定事件之后：

secondSpecificEvent
- EVENTID
- 事件消息
- eventOccurred

如何为每个特定事件添加单独的eventId，eventMessage和eventOccurred OBECT-TYPE定义？是否可以定义一个允许以下内容的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

我最终通过创建一个事件表来解决这个问题，就像@LexLi建议的那样。这样，对于行条目的定义，只需要一次OBJECT-TYPE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 }

C＃SNMP代理 - 表示MIB中的复杂类型

1 个答案: