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Hi,I need to parse GTP' packet consisting in its message field the GCDR and then SRecord. Srecord is the record defined by us.Now obviously I need to add code to the ethereal to do this.I plan to check for the type fields in the pay load of the packet myself and then call the corresponding decoding functions for those fields. This I feel will give me more control on the execution of the code.Now I would like to know where it would be best to add the code?Shall I add the parsing code for both the G-CDR and the Srecord in decode_gtp_tr_comm( ........) function?In the above function the return value is 2 --- is this the offset returned?In that case let us assume that I have parsed the contents of the G -CDR and SRecord in the decode_gtp_tr_comm ( ) function. Now, if I return from the function decode_gtp_tr_comm( ) --- the value ( 2 + number of bytes in G-CDR + the number of bytes in Srecord ) would that be correct?Or shall i need to add the parsing code in dissect_gtp( ) ?Which is better?And if i call from the function, decode_gtp_tr_com( ), the decoder functions such as decode_gtp_imsi( ) or decode_gtp_msisdn( ) directly would that be correct ?And one final thing, now are all the functions to decode each of the fields in G-CDR provided in ethereal or I have to write atleast some of the decoder functions for the parsing of the G-CDR fields ? I have found some of the functions but still have to search for the other functions for decoding the G-CDR fields. How ever for SRecord fields I obviously have to write my own decoder functionsThanks a lot,Prashanth
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