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/* packet-time.c
* Routines for Time Protocol (RFC 868) packet dissection
*
* Richard Sharpe <rsharpe@ns.aus.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-tftp.c
*
* 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 <epan/packet.h>
#include <epan/prefs.h>
static const enum_val_t time_display_types[] = {
{ "UTC", "UTC", ABSOLUTE_TIME_UTC },
{ "Local", "Local", ABSOLUTE_TIME_LOCAL},
{ NULL, NULL, 0 }
};
static int proto_time = -1;
static int hf_time_time = -1;
static gint ett_time = -1;
static absolute_time_display_e time_display_type = ABSOLUTE_TIME_LOCAL;
/* This dissector works for TCP and UDP time packets */
#define TIME_PORT 37
static void
dissect_time(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *time_tree;
proto_item *ti;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TIME");
col_add_fstr(pinfo->cinfo, COL_INFO, "TIME %s",
pinfo->srcport == pinfo->match_uint ? "Response":"Request");
if (tree) {
ti = proto_tree_add_item(tree, proto_time, tvb, 0, -1, ENC_NA);
time_tree = proto_item_add_subtree(ti, ett_time);
proto_tree_add_text(time_tree, tvb, 0, 0,
pinfo->srcport==TIME_PORT ? "Type: Response":"Type: Request");
if (pinfo->srcport == TIME_PORT) {
/* seconds since 1900-01-01 00:00:00 GMT, *not* 1970 */
guint32 delta_seconds = tvb_get_ntohl(tvb, 0);
proto_tree_add_uint_format(time_tree, hf_time_time, tvb, 0, 4,
delta_seconds, "%s",
abs_time_secs_to_str(delta_seconds-2208988800U, time_display_type, TRUE));
}
}
}
void
proto_register_time(void)
{
static hf_register_info hf[] = {
{ &hf_time_time,
{ "Time", "time.time",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Seconds since 00:00 (midnight) 1 January 1900 GMT", HFILL }}
};
static gint *ett[] = {
&ett_time,
};
module_t *time_pref ;
proto_time = proto_register_protocol("Time Protocol", "TIME", "time");
proto_register_field_array(proto_time, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
time_pref = prefs_register_protocol(proto_time, NULL);
prefs_register_enum_preference(time_pref,
"display_time_type",
"Time Display",
"Time display type",
(gint *)&time_display_type,
time_display_types,
FALSE);
}
void
proto_reg_handoff_time(void)
{
dissector_handle_t time_handle;
time_handle = create_dissector_handle(dissect_time, proto_time);
dissector_add_uint("udp.port", TIME_PORT, time_handle);
dissector_add_uint("tcp.port", TIME_PORT, time_handle);
}
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