wmnsk / go-tcap Goto Github PK

Hi, I'm not sure if I'm doing this incorrectly, but using the library, I am try to send the following HEX byte string that is ASN1 encoded.

307180016e83078313873881620385010a8a058493527008bb0580038090a39c01029f320836155030868778f0bf3417020100810791527088113046a309800736f50100f1026fbf35038301119f3605dad1c900079f3707915270881130469f38068170880804199f39080242100341402080

I was expecting that wireshark would be able to successfully decode the payload, but instead it failed
Expected,

But got the following,

Here is the code snippet I used to generate the tcapPayload...

	hexString := "307180016e83078313873881620385010a8a058493527008bb0580038090a39c01029f320836155030868778f0bf3417020100810791527088113046a309800736f50100f1026fbf35038301119f3605dad1c900079f3707915270881130469f38068170880804199f39080242100341402080"

	p, err := hex.DecodeString(hexString)
	if err != nil {
		fmt.Println("Error decoding hex string:", err)
		return
	}

	tcapPayload := tcap.NewBeginInvokeWithDialogue(
		uint32(*otid),     // OTID
		tcap.DialogueAsID, // DialogueType
		uint8(50),
		1, // ACN Version
		0, // Invoke Id
		0, // OpCode
		p, // Payload
	)

Am I missing a setting or flag to be set?

Any assistance will be greatly appreciated. I am fairly new to SCCP/TCAP/CAMELv2, so please excuse any ignorance or strange questions.

Many thanks,
Danie

It looks like if no protocol version is defined this function will fail to correctly process the rest of the bytes

Hi,
Can you give another example where there are more than 1 transaction? i.e ul, isd, ul_ack?

I am new to go and following your instruction to run client. I am getting this error below:
go-tcap/examples/client# ./client -h
bash: ./client: No such file or directory

ASN1 has 2 implementations for the data length.

• short ( < 127 )
• long ( > 127 )

then the IE value length is greater than 127 it still encodes/decodes the length in the shorter implementation thus not able to communicate with any other ASN1 service.

I suggest to have simple client/server project for go-tcap package,
it will be easy to new comers to understand and use that package