Re: Attempting new dissectors using ASN and asn2wrs under MSVC 2008E

[Anders Broman <a.broman () telia com>]

Adrienne Siskind skrev 2010-04-09 22:22:
> Greetings,
>
> I am attempting to add SLE dissectors to Wireshark using their official ASN descriptions and the asn2wrs translation 
> tool in WinXP with VC9.0 express (MSVC_VARIANT=MSVC2008EE).  I am using the latest stable Wireshark sources - 1.2.7.
>
> > From a working Wireshark dev environment that builds the base sources into a full NSIS install package correctly, I 
> > have thus far encountered two separate problems:
>     1. getting a translated asn packet-<name>.c/h to compile and link
>        once it is added into the epan/dissectors directory and makefile, and
>     2. cleanly translating the official CCSDS ASN definition of the
>        desired SLE service using asn2wrs.
>
> 1:
>
> I started by using the "foo" example on the ans2wrs wiki to understand the process for going from ASN definition to 
> Wireshark package with new dissector.
>
> It is here:  http://wiki.wireshark.org/ASN1_sample
>
> > From this example, Makefile.nmake did need several minor corrections, but it was not hard to get it working 
> > correctly.  Thus "packet-foo.c" and "packet-foo.h" are now properly generated, have their eols fixed, and are 
> > copied to epan/dissectors using the 'copy_files' target.  (To fix Makefile.nmake, change "PKCS1.asn" in line 16 to 
> > "foo.asn", and fix the path names in lines 5,  7, 16, and 18 to use backslash instead of forward slash.)
>
> In Makefile.common in the epan/dissectors directory, I respectively added  packet_foo.c and packet_foo.h into the 
> DIRTY_ASN1_DISSECTOR_SRC and DISSECTOR_INCLUDES lists.  Then back to the wireshark root, and make targets distclean 
> and all.
>
> The resulting compile fails for the asn2wrs-generated packet-foo.c.  The compilation errors ostensibly occur in 
> packet-per.h, and are of the type I'd usually expect to see if there was a missing closing brace somewhere above.  I 
> did change the inclusion of packet-per.h to packet-ber.h to see what would happen, but this simply replaced one set 
> of compile errors with another.
>    
Did you #include <epan/asn1.h>?
> 2:
>
> Separately, under asn1\, I copy&pasted the ASN specification for the SLE Forward CLTU service (the one we need first) 
> into appropriately named files; appropriately tweaked the .cnf, packet-<name>-template.c/.h, and makefile from my 
> experimental foo directory; and tried to make target all (which creates the packet-<name>.c and .h files using 
> asn2wrs).
>
> This also failed.  In this case, the traceback says it failed on line 91 in 
> ccsds-sle-transfer-service-bind-types.asn, which is the second file in the spec (I listed them in the makefile in the 
> order they appear in the spec).  The error was "Unexpected token ALL('ALL')"
>
> The spec is here (the asn definition is in Annex A at the end):
> http://public.ccsds.org/publications/archive/912x1b2c1.pdf
>
> The line in question reads:
>     IdentifierString ::= VisibleString (FROM (ALL EXCEPT ” ”))
>
> Any insight into what I may be doing wrong for either would be greatly appreciated.
>    
I think asn2wrs may not handle that construct, to get it to compile try 
to replace it with:

IdentifierString ::= VisibleString
(later it could be replaced by a list of all VisibleString
chars except " "


> Thanks,
> --
> Adrienne
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