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
|
/* 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
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#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_with_preference("udp.port", TIME_PORT, time_handle);
dissector_add_uint_with_preference("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:
*/
|
