Wireshark · Wireshark-dev: [Wireshark-dev] Trouble adding an ASN.1 based dissector

[Stephen Fisher <stephentfisher@xxxxxxxxx>]

I'm stumbling through (is there a README somewhere?) trying to add my
first ASN.1 based dissector (T.124 / Generic Conference Control) to
Wireshark and I'm running into the following error.  I mostly copied the
asn1/t124 files from asn1/t125.  This is another layer in a Microsoft
Remote Desktop Protocol (RDP) session above t.125.

sfisher@shadow:/usr/local/src/wireshark/asn1/t124>make generate_dissector
python ../../tools/asn2wrs.py \
        -b -X -T \
        -p t124 \
        -c ./t124.cnf \
        -s ./packet-t124-template \
        -D . \
         GCC-PROTOCOL.asn 
ASN.1 to Wireshark dissector compiler
Traceback (most recent call last):
  File "../../tools/asn2wrs.py", line 7671, in ?
    eth_main()
  File "../../tools/asn2wrs.py", line 7602, in eth_main
    ast.extend(yacc.parse(f.read(), lexer=lexer, debug=pd))
  File "/usr/local/src/wireshark/tools/yacc.py", line 346, in parse
    tok = self.errorfunc(errtoken)
  File "../../tools/asn2wrs.py", line 7455, in p_error
    raise ParseError(t, input_file)
__main__.ParseError: GCC-PROTOCOL.asn:54: Unexpected token UniversalString('UniversalString')
make: *** [packet-t124.c] Error 1

Am I doing something wrong, or does it not like part of the .asn file?

Also, how do I go about creating the t.124.cnf file?  (My attempt above
was using the t125.cnf file)


Thanks,

Steve