forked from osmocom/wireshark
4b12683547
The time protocol (port 37) dissector (packet-time.c) currently only supports UDP. The protocol has an identical implementation over TCP as well. This patch adds support to the dissector for TCP time in addition to the UDP time packets svn path=/trunk/; revision=18822
102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/* packet-time.c
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* Routines for Time Protocol (RFC 868) packet dissection
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*
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* Richard Sharpe <rsharpe@ns.aus.com>
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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 Gerald Combs
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*
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* Copied from packet-tftp.c
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <epan/packet.h>
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static int proto_time = -1;
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static int hf_time_time = -1;
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static gint ett_time = -1;
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/* This dissector works for TCP and UDP time packets */
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#define TIME_PORT 37
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static void
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dissect_time(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *time_tree;
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proto_item *ti;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TIME");
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "TIME %s",
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pinfo->srcport == pinfo->match_port ? "Response":"Request");
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_time, tvb, 0, -1, FALSE);
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time_tree = proto_item_add_subtree(ti, ett_time);
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proto_tree_add_text(time_tree, tvb, 0, 0,
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pinfo->srcport==TIME_PORT ? "Type: Response":"Type: Request");
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if (pinfo->srcport == TIME_PORT) {
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/* seconds since 1900-01-01 00:00:00 GMT, *not* 1970 */
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guint32 delta_seconds = tvb_get_ntohl(tvb, 0);
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proto_tree_add_uint_format(time_tree, hf_time_time, tvb, 0, 4,
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delta_seconds, "%s",
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abs_time_secs_to_str(delta_seconds-2208988800U));
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}
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}
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}
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void
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proto_register_time(void)
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{
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static hf_register_info hf[] = {
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{ &hf_time_time,
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{ "Time", "time.time",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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"Seconds since 00:00 (midnight) 1 January 1900 GMT", HFILL }}
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};
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static gint *ett[] = {
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&ett_time,
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};
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proto_time = proto_register_protocol("Time Protocol", "TIME", "time");
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proto_register_field_array(proto_time, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_time(void)
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{
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dissector_handle_t time_handle;
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time_handle = create_dissector_handle(dissect_time, proto_time);
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dissector_add("udp.port", TIME_PORT, time_handle);
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dissector_add("tcp.port", TIME_PORT, time_handle);
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}
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