I have a plugin dissector I am working on that dissects a custom protocol with
about a dozen main message types. In order to manage it easier I have broken
the code into multiple .c files. I seems that when I do that though, the
actual functions I call in the 2nd .c file have problems with the ett subtree
array.
When compiled and run I see the following errors for all packets dissected in
the 2nd .c file.
Dissector bug, protocol BLAH: proto.c:3640: failed assertion "idx >=0 &&
idx < num_tree_types"
Here is the snippet of code:
dissect_keep_alive(tvbuff_t *tvb, packet_info *pinfo, int offset, proto_tree
*tree, int message_length)
{
proto_item *ti = NULL;
proto_tree *keepalive_tree = NULL;
if (tree) {
ti = proto_tree_add_text(tree, tvb, offset, message_length,
"KeepAlive");
ti = proto_tree_add_text(tree, tvb, offset, message_length,
"ett_keepalive %d",ett_keepalive);
keepalive_tree = proto_item_add_subtree(ti, ett_keepalive);
proto_tree_add_item(keepalive_tree, hf_keepalive_timeout, tvb,
offset, 2, FALSE); offset += 2;
proto_tree_add_item(keepalive_tree, hf_keepalive_spare, tvb,
offset, 2, FALSE); offset += 2;
}
}
It appears that ett_keepalive is -1 when I run wireshark. I have defined the
ett_keepalive and the ett subtree in the .h file.
static gint ett_keepalive = -1;
static gint *ett[] = {
...
&ett_keepalive,
...
};
It all works when I have just one source file but when I moved these functions
to the 2nd file, I started having this problem. Do I need to define these in
the proto_register function and explicitly pass the ett subtree array? Is
there an example dissector that has the dissector spread across multiple .c
files and single .h file?
My C skills are a bit rusty so thank you for your patience.
Jason
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