1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/* packet-time.c
* Routines for Time Protocol (RFC 868) packet dissection
*
* Richard Sharpe <rsharpe@ns.aus.com>
*
* 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>
#include <epan/to_str.h>
void proto_reg_handoff_time(void);
void proto_register_time(void);
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 int hf_time_response = -1;
static gint ett_time = -1;
/* Instead of using absolute_time_display_e as the type for
* time_display_type, we use gint to avoid a type-punning problem
* with prefs_register_enum_preference(). This variable is also
* used with abs_time_secs_to_ep_str(), which _does_ take
* an absolute_time_display_e, but gcc doesn't complain about
* casting the gint to absolute_time_display_e */
static gint time_display_type = ABSOLUTE_TIME_LOCAL;
/* This dissector works for TCP and UDP time packets */
#define TIME_PORT 37
static int
dissect_time(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
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");
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_boolean(time_tree, hf_time_response, tvb, 0, 0, pinfo->srcport==pinfo->match_uint);
if (pinfo->srcport == pinfo->match_uint) {
/* 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(wmem_packet_scope(), delta_seconds-2208988800U,
(absolute_time_display_e)time_display_type, TRUE));
}
return tvb_captured_length(tvb);
}
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 }},
{ &hf_time_response,
{ "Type", "time.response",
FT_BOOLEAN, BASE_NONE, TFS(&tfs_response_request), 0x0,
"Response or Request", 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);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
|
