Thanks for the quick answer,
In this case, is there any example code available that exists
implementing a sub-dissector like the one I'm trying to code below, so
that I can look at it to see what I'm doing wrong?
Thx,
/Sebas
------------------------------------------------------------------------
------------------------
Sebastien Dubois schrieb:
Hi,
I'm currently having problems trying to implement a new plugin
as a sub-dissector to another plugin. The first plugin (let's call it
foo_proto) registers itself and adds itself as a dissector that uses a
given udp port as follows:
-------------------------------------------------------
*void** proto_register_foo_proto*(*void*)
{
module_t* foo_proto_module;
* if* (proto_foo_proto == -1)
{
proto_foo_proto =* proto_register_protocol*("Foo Protocol ",
"foo_proto", "foo_proto"); * register_dissector*("foo_proto",
dissect_foo_proto, proto_foo_proto); *
proto_register_field_array*(proto_foo_proto, hf, array_length(hf));
* proto_register_subtree_array*(ett, array_length(ett));
}
foo_proto_module =* prefs_register_protocol*(proto_foo_proto,
proto_reg_handoff_foo_proto);
}
*void** proto_reg_handoff_foo_proto*(*void*)
{
* static** int* Initialized = FALSE;
* if* (!Initialized)
{
foo_proto_handle =* create_dissector_handle*(dissect_foo_proto,
proto_foo_proto);
* dissector_add*("udp.port", foo_proto_port,
foo_proto_handle);
Initialized = TRUE;
}
} -------------------------------------------------------
The second plugin (let's call it foo2_proto) also registers
itself and adds itself as a dissector that uses a registered field in
the previous dissector foo_proto as follows:
-------------------------------------------------------
*void** proto_register_foo2_proto*(*void*)
{
module_t* foo2_proto_module;
* if* (proto_foo2_proto == -1)
{
proto_foo2_proto =* proto_register_protocol*("Foo2 Protocol ",
"foo2_proto", "foo2_proto"); * register_dissector*("foo2_proto",
dissect_foo2_proto, proto_foo2_proto); *
proto_register_field_array*(proto_foo2_proto, hf, array_length(hf));
* proto_register_subtree_array*(ett, array_length(ett));
}
foo2_proto_module =* prefs_register_protocol*(proto_foo2_proto,
proto_reg_handoff_foo2_proto);
}
*void** proto_reg_handoff_foo2_proto*(*void*)
{
* static** int* Initialized = FALSE;
* if* (!Initialized)
{
foo2_proto_handle =*
create_dissector_handle*(dissect_foo2_proto, proto_foo2_proto); *
dissector_add*("foo_proto.hf_some_field", foo2_proto_port,
foo2_proto_handle);
Initialized = TRUE;
}
} -------------------------------------------------------
This compiles fine, but I get the following assertion failure in
function dissector_add(...) at startup:
Err file packet.c: line 671: assertion failed: (sub_dissectors)
It seems that the first plugin (foo) is not registered when the
second one (foo2) calls dissector_add on it.
So, how does this work? How can you add a plugin dissector to
another plugin dissector? Is it at all possible?
Wireshark will call all register functions (it knows of) before calling
any of the handoff functions. So this sequence should not be your
problem.
The line 671 of the assert might get a hint, but it's a bit worthless
together with your code snippet ...
Regards, ULFL
------------------------------------------------------------------------
-----------
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