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.
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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