On Thu, Sep 12, 2019 at 2:33 AM <afriyie.abra...@gmail.com> wrote:
>
> Can anyone help me perform dynamic unmarshalling depending on the type of
> messages received from a diameter client. In the code below, I have to two
> structures which represent two different messages received by a diameter
> server. I would like to modify the current code which unmarshals the request
> to the struct `var req HandleDERRequest` such that the unmarshalling is done
> dynamically either to the `var req HandleDERRequest` or `var challreq
> HandleChallRequest`, depending on the received message that matches a
> particular structure. I have tried to implement with the code below but it
> not working as it should. All the answers are being return at the same time
> and this is not what am expecting.
HandleChallRequest is a subset of HandleDERRequest. How do you figure
out the received message is a HandleDERRequest? If it is done only by
the absence of fields, then you can simply unmarshal a
HandleDERRequest, check if certain fields are missing, and if so, copy
it to a HandleChallRequest.
Or, since HandleDERRequest has more fields, you can embed
HandleChallRequest into HandleDERRequest, and if certain fields are
missing, use only the HandleChallRequest portion of it.
>
> func HandleDER(settings sm.Settings) diam.HandlerFunc {
>
> // If received AVP messages are of this struct format, Unmarshal
> message to this structure
>
> type HandleDERRequest struct {
> SessionID datatype.UTF8String `avp:"Session-Id"`
> OriginHost datatype.DiameterIdentity `avp:"Origin-Host"`
> OriginRealm datatype.DiameterIdentity `avp:"Origin-Realm"`
> DestinationHost datatype.DiameterIdentity
> `avp:"Destination-Host"`
> DestinationRealm datatype.DiameterIdentity
> `avp:"Destination-Realm"`
> UserName datatype.UTF8String `avp:"User-Name"`
> AuthSessionState datatype.Enumerated
> `avp:"Auth-Session-State"`
> AuthApplicationID datatype.Unsigned32
> `avp:"Auth-Application-Id"`
> AuthRequestType datatype.Enumerated
> `avp:"Auth-Request-Type"`
> EAPPayload datatype.OctetString `avp:"EAP-Payload"`
> RATType datatype.Enumerated `avp:"RAT-Type"`
> ANID datatype.UTF8String `avp:"ANID"`
> }
>
> // If received AVP messages are of this struct format, Unmarshal
> message to this structure
>
> type HandleChallRequest struct {
> SessionID datatype.UTF8String `avp:"Session-Id"`
> OriginHost datatype.DiameterIdentity `avp:"Origin-Host"`
> OriginRealm datatype.DiameterIdentity `avp:"Origin-Realm"`
> DestinationHost datatype.DiameterIdentity
> `avp:"Destination-Host"`
> DestinationRealm datatype.DiameterIdentity
> `avp:"Destination-Realm"`
> EAPPayload datatype.OctetString `avp:"EAP-Payload"`
> }
>
> return func(c diam.Conn, m *diam.Message) {
>
> var err error = nil
> var req HandleDERRequest
>
> var code uint32 = diam.Success
> err = m.Unmarshal(&req)
> if err != nil {
> err = fmt.Errorf("Unmarshal failed: %s", err)
> code = diam.UnableToComply
> log.Printf("Invalid DER(%d): %s\n", code, err.Error())
> }
> a := m.Answer(code)
> a.NewAVP(avp.SessionID, avp.Mbit, 0, req.SessionID)
> a.NewAVP(avp.OriginHost, avp.Mbit, 0, req.DestinationHost)
> a.NewAVP(avp.OriginRealm, avp.Mbit, 0, req.DestinationRealm)
> a.NewAVP(avp.OriginStateID, avp.Mbit, 0, settings.OriginStateID)
> _, err = AKA_Challenge_Request(settings, c, a)
> if err != nil {
> log.Printf("Failed to send AAA challenge request: %s",
> err.Error())
> }
>
> var challreq HandleChallageRequest
> err = m.Unmarshal(&challreq)
> if err != nil {
> err = fmt.Errorf("Unmarshal failed: %s", err)
> code = diam.UnableToComply
> log.Printf("Invalid DER(%d): %s\n", code, err.Error())
> }
> a = m.Answer(code)
> a.NewAVP(avp.SessionID, avp.Mbit, 0, req.SessionID)
> a.NewAVP(avp.OriginHost, avp.Mbit, 0, req.DestinationHost)
> a.NewAVP(avp.OriginRealm, avp.Mbit, 0, req.DestinationRealm)
> a.NewAVP(avp.OriginStateID, avp.Mbit, 0, settings.OriginStateID)
> _, err = AKA_Success_Notification(settings, c, a)
> if err != nil {
> log.Printf("Failed to send Success Notification: %s",
> err.Error())
> }
> }
> }
>
> I know there should be an if condition of the return function but I don't
> know how to start. Please any idea about how to go about it.
>
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