Wireshark · Wireshark-dev: [Wireshark-dev] dissector question- reasembling packets

[יוני תובל <yoni6666@xxxxxxxxx>]

hi ,

 

i've implemented a dissector in the development version of wireshark and it worked .

when i placed the dissectors dill's in the release version , the dissector failed .

i've debbuged it , and noticed that he function :  tcp_dissect_pdus behaves differently between both version .

 

i am using dynamic arrays in my messages .

that means that it a bit complicated to fetch the size of the packet from within the data.

therefor i am using the function like this

tcp_dissect_pdus(tvb, pinfo, tree, TRUE, fixed_size_to_ask, get_message_len, dissect_mprest_irondome_grds_interface);

and each time i get a maximum size packet, i assue that the message is greater then 1460bytes and i set fixed_size_to_ask = 1461 .

in the development version , the next tvb->length i receive is 1460 + "size of the next packet" .

in the release version i receive the actual size i asked for , 1461 .

 

does anyone know why this happens ?

 

 

 

 

thanks

 

yonatan tuval