Hi all,
I have created two dissectors.
I would like one dissector to use the other one.
I am getting a NULL return value when I call find_dissector();
The lower level dissector is named mgw and the pertinent code sections are:
>From file packet-mgw.c:
---8<---
void proto_register_mgw();
void proto_reg_handoff_mgw();
static void dissect_mgw(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static int proto_mgw = -1;
static dissector_handle_t mgw_handle;
void
proto_register_mgw(void)
{
static hf_register_info hf[] = {
/* MGW header */
{ &hf_mgw_hdr,
{ "Message Header",
"mgw.hdr",
FT_PROTOCOL,
BASE_NONE,
NULL,
0x0,
"",
HFILL }},
...
proto_mgw = proto_register_protocol ("LSI MGW Framework Transport Protocol",
"LSI MGW", "mgw");
proto_register_field_array(proto_mgw, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_mgw(void)
{
static gboolean initialized = FALSE;
guint32 i;
if (!initialized) {
mgw_handle = create_dissector_handle(dissect_mgw, proto_mgw);
for (i=global_mgw_base_port;i<=(global_mgw_base_port+3);i++) {
dissector_add("udp.port", i, mgw_handle);
}
/* dissector_add("lsiint_hc.dstch", 0x07f0, mgw_handle); */
/* dissector_add("lsiint_hc.dstch", 0x07f1, mgw_handle); */
/* dissector_add("lsiint_hc.dstch", 0x07f2, mgw_handle); */
/* dissector_add("lsiint_hc.dstch", 0x07f3, mgw_handle); */
initialized = TRUE;
}
}
---8<---
Calling from UDP port above works fine.
However, when I try to call from my upper level dissector, it fails.
The commented out dissector_add functions cause wireshark to crash.
>From file packet-lsiint.c:
---8<---
void proto_reg_handoff_lsiint();
void proto_register_lsiint_hc();
static dissector_handle_t lsiint_hc_handle;
void
proto_reg_handoff_lsiint(void)
{
static gboolean initialized = FALSE;
if (!initialized) {
lsiint_hc_handle = create_dissector_handle(dissect_lsiint_hc,
proto_lsiint_hc);
register_dissector("lsiint_hc", dissect_lsiint_hc, proto_lsiint_hc);
mgw_handle = find_dissector("mgw");
if (mgw_handle == NULL) {
fprintf(stderr, "MGW handle is NULL\n");
}
data_handle = find_dissector("data");
initialized = TRUE;
}
}
---8<---
If I make mgw_handle global in packet-mgw.c and an extern in packet-lsiint.c,
then the protocol decodes happen as they should.
What am I doing wrong with the registration?
Many thanks in advance,
-posey
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