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If you use a local static variable in the
dissect_yourprot() function, it will store the number across
packets.
eg:
//don't expect this to compile, it's just a
mock-up
static int dissect_yourprot(pinfo, tvb, tree)
{
static guint32 last_sequence_number =
0;
guint32
sequence_number;
...
sequence_number = tvb_get_ntohl(tvb,
2);
if (last_sequence_number &&
sequence_number != last_sequence_number + 1) {
//gap!
}
last_sequence_number =
sequence_number;
...
}
-Patrick
Hi,
I’m fairly new to Wireshark
development...actually, I just started today.
I wrote a plugin for a UDP based
protocol and it’s working fine. The protocol has a sequence number as the
second field (4 bytes, offset = 2 bytes). The sequence numbers are sent
sequentially, but since this is UDP, I am not guaranteed to receive all
packets. How can I get the plugin to check for gaps in the sequence
numbers?
Thanks.
Kwan
Ng
Development
Integration Specialist
P
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