Hi,
A global variable won't work for two reasons:
1. The capture file is accessed randomly.
2. You might have multiple exchanges you need to follow.
To tackle point 2 you can use conversations. Read about them in
README.developer. To collect and keep track of protocol data across packets
have a look at README.request_response_tracking.
Thanx,
Jaap
Hans Glück wrote:
> Hello,
>
> I´m writing a dissector and I want to implement "error recovery mode"/"flow
> control", therefor I need two gloabl variables where I can store some values
> (-> "next_expected_frame_to_be_recieved" and
> "next_expected_frame_to_be_send").
> I declared them at the beginning of my c-file:
> static guint8 next_expected_frame_to_be_recieved = 0;
> static guint8 next_expected_frame_to_be_send = 0;
>
> And I set value of this variables in my dissector code:
> static void dissect_mux27010(tvbuff_t *tvb, packet_info *pinfo, proto_tree
> *tree){
> ...
> if (received_successful()) {
> next_expected_frame_to_be_recieved++;
> }
> ...
> }
>
> My problem is: Every time I click in Wireshark at packet the value is
> increased e.g.
> click first packet -> next_expected_frame_to_be_recieved == 1
> click second packet -> next_expected_frame_to_be_recieved == 2
> click first packet -> next_expected_frame_to_be_recieved == 3
> click second packet -> next_expected_frame_to_be_recieved == 4
>
> But what I want is that the variables are increased step-by-step/ ordered (if
> packet n is an ACK -> increase; if packet n+1 is an ACK -> increase...)
> How can I realize this?
>
> Thanks for any advice.
> Chris
>
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