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/* packet-mime-encap.c
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib.h>
#include <epan/packet.h>
#include "tvbuff-int.h"
static int proto_mime_encap = -1;
static heur_dissector_list_t heur_subdissector_list;
static dissector_handle_t data_handle;
static tvbuff_t *file_tvbs;
static tvbuff_t *whole_tvb;
static void
mime_encap_init(void)
{
if (file_tvbs) {
tvb_free_chain(file_tvbs);
file_tvbs = NULL;
whole_tvb = NULL;
}
}
static void
dissect_mime_encap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item* item;
guint len;
/* XXX, COL_INFO */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MIME_FILE");
item = proto_tree_add_item(tree, proto_mime_encap, tvb, 0, -1, ENC_NA);
/* frames with nsec >= 1000000000 means errors :) */
if (pinfo->fd->abs_ts.nsecs >= 1000000000) {
proto_item_append_text(item, " (Error)");
/* return; */ /* dissect what we have */
}
len = tvb_length(tvb);
if (!pinfo->fd->flags.visited) {
if (len) {
tvbuff_t *cloned_tvb = tvb_clone(tvb);
if (!file_tvbs) {
file_tvbs = cloned_tvb;
whole_tvb = tvb_new_composite();
} else
tvb_add_to_chain(file_tvbs, cloned_tvb);
tvb_composite_append(whole_tvb, cloned_tvb);
} else
tvb_composite_finalize(whole_tvb);
}
/* End of file? */
if (!len && whole_tvb) {
/*
* Here we're doing some trick.
*
* We don't want to call dissectors with composite tvb, cause dissectors can create subsets or real data child
* on it, which would append to whole_tvb chain and would be freed only in mime_encap_init.
*
* So we create some tvb which pass all calls to whole_tvb, but chain with tvb (which is freed in dissection cleanup)
*/
tvbuff_t *tmp_tvb = tvb_new_chain(tvb, whole_tvb);
proto_item_append_text(item, " (Final)");
add_new_data_source(pinfo, tmp_tvb, "Whole file");
if (!dissector_try_heuristic(heur_subdissector_list, tmp_tvb, pinfo, tree, NULL)) {
proto_item_append_text(item, " (Unhandled)");
call_dissector(data_handle, tmp_tvb, pinfo, tree);
}
}
}
void
proto_register_mime_encap(void)
{
proto_mime_encap = proto_register_protocol("MIME file", "MIME_FILE", "mime_dlt");
register_dissector("mime_dlt", dissect_mime_encap, proto_mime_encap);
register_init_routine(mime_encap_init);
register_heur_dissector_list("wtap_file", &heur_subdissector_list);
}
void
proto_reg_handoff_mime_encap(void)
{
dissector_handle_t mime_encap_handle;
data_handle = find_dissector("data");
mime_encap_handle = find_dissector("mime_dlt");
dissector_add_uint("wtap_encap", WTAP_ENCAP_MIME, mime_encap_handle);
}
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