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