Hello List,
I'm on my way to complete my plugin. One of the last issues I must deal with
is fragmentation.
I've implemented it following the scheme suggested in the Dev Guide. No way!
The following instruction is executed:
------------------------------------------------------------------------------------------------------------------------
if (check_col (pinfo->cinfo, COL_INFO)
if (frag_msg)
col_append_fstr(pinfo->cinfo, COL_INFO, "(Message reassembled)");
-------------------------------------------------------------------------------------------------------------------------
where *frag_msg* is a fragment_data pointer initialized at this point:
--------------------------------------------------------------------------------------------------------------------------
frag_msg = fragment_add_seq_check(tvb, offset, pinfo, mg_seqid,
msg_fragment_table, msg_reassembled_table, pkth->seq - msg_num,
!(flags&EOM_FLAG))
---------------------------------------------------------------------------------------------------------------------------
Now, the problems are:
A) Even if actually the last fragmented packet has COL_INFO = "Message
Reassmebled" I do not see the whole content in the hex pane (like, for
instance, IP reassembled packets)
B) When I reload (or change) the capture file it throws a SIGSEGV in
fragment_table_init(&msg_reassembled_table), precisely:
fragment_table_init()->g_hash_table_size()->range_copy()->g_free()->free()
Why?! I think it has to do with offset values i use in
process_reassambled(..) and in fragment_add_seq_check(...)
So, does offset have to change depending on whether it's the first packet or
not?
Because the first packet has a( PKT+MSG) header the others don't (they have
just PKT header), so I guess while the first packet must include both
headers (then the offset must be 0 because we have to "insert" the whole tvb
into msg_fragment_table) the others must be inserted skipping PKT header
(then offset = 16).
I've had a look at both the code in reassemble.c and other dissectors, and
it looks like it works like mine, but I must be wrong somewhere! The
question is, where? : D
thanx
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