X2AP message decode providing error

[suchitsatpathy]

Hi ;

I was trying to decode the following x2ap message and saw the warning messages .

I event downloaded the latest version of the spec [3GPP TS 36.423 V16.0.0] and used the 'python -m pycrate_asn1c.asnproc' command to compile it again .

Is there any property for the ASN 0bject to verify what is the spec version and is there any option to suppress these warnings.

Msg: 001c4030000004006f0002078300cf00048001fc0700d64003100100a8dd40140000021041400804de796c949ef6211042400100

OutPut : OPEN._from_per: InitiatingMessage.protocolIEs.item.value, unable to retrieve a table-looked up object ENUM._safechk_bnd: criticality, unable to retrieve a defined object ENUM._safechk_bnd: criticality, unable to retrieve a defined object ('initiatingMessage : {\n' ' procedureCode 28,\n' ' criticality ignore,\n' ' value SgNBReconfigurationComplete: {\n' ' protocolIEs {\n' ' {\n' ' id 111,\n' ' criticality reject,\n' ' value UE-X2AP-ID: 1923\n' ' },\n' ' {\n' ' id 207,\n' ' criticality reject,\n' ' value SgNB-UE-X2AP-ID: 130055\n' ' },\n' ' {\n' ' id 214,\n' ' criticality ignore,\n' ' value ResponseInformationSgNBReconfComp: success-SgNBReconfComp : {\n' " meNBtoSgNBContainer '00'H\n" ' }\n' ' },\n' ' {\n' ' id 43229,\n' ' criticality ignore,\n' " value '0000021041400804DE796C949EF6211042400100'H\n" ' }\n' ' }\n' ' }\n' '}')

[p1-bmu]

I guess the message you provided is not corresponding to a X2AP_PDU_Descriptions.X2AP_PDU, maybe a substructure of it, or a message with some proprietary structures ? Where does it come from ? What do you expect as a type of message and content ?

Regarding the versioning of ASN.1 specifications, you can check the OID of a module (when defined), by calling the _oid_ attribute:

In [12]: X2AP_PDU_Descriptions._oid_
Out[12]: [0, 4, 0, 0, 21, 3, 2, 1, 0]

On the other side, I am not sure those OID set for 3GPP RAN protocols follow the exact 3GPP TS versioning scheme.

[suchitsatpathy]

Thanks Ben;

you are right . I used wireshark to decode it and it looks unknown . With that , it is possible to disable these warnings ? So the output is not going to show these messages .

It came from one of the debug print out from one RAN vendor . I think they might have some proprietary information in there . I will just strip these bits as it is same for all X2 messages.

[cid:73799cef-523f-4c2d-9f14-921bb8a301bc] Suchit Satpathy

---

From: Benoit Michau notifications@github.com Sent: Thursday, May 14, 2020 4:08 AM To: P1sec/pycrate pycrate@noreply.github.com Cc: suchitsatpathy suchit.satpathy@hotmail.com; Author author@noreply.github.com Subject: Re: [P1sec/pycrate] X2AP message decode providing error (#82)

I guess the message you provided is not corresponding to a X2AP_PDU_Descriptions.X2AP_PDU, maybe a substructure of it, or a message with some proprietary structures ? Where does it come from ? What do you expect as a type of message and content ?

Regarding the versioning of ASN.1 specifications, you can check the OID of a module (when defined), by calling the oid attribute:

In [12]: X2AP_PDU_Descriptions.oid Out[12]: [0, 4, 0, 0, 21, 3, 2, 1, 0]

On the other side, I am not sure those OID set for 3GPP RAN protocols follow the exact 3GPP TS versioning scheme.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHubhttps://github.com/P1sec/pycrate/issues/82#issuecomment-628469003, or unsubscribehttps://github.com/notifications/unsubscribe-auth/ANONNSA5BHSANJENPUIZBA3RRORI7ANCNFSM4NAHZWDA.

[p1-bmu]

This should silent the prints related to ASN.1 encoding / decoding:

In [1]: from pycrate_asn1rt.asnobj import ASN1Obj

In [2]: ASN1Obj._SILENT = True