130 lines
3.8 KiB
C
130 lines
3.8 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/to_str.h>
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#include <wsutil/epochs.h>
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void proto_reg_handoff_time(void);
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void proto_register_time(void);
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static const enum_val_t time_display_types[] = {
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{ "UTC", "UTC", ABSOLUTE_TIME_UTC },
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{ "Local", "Local", ABSOLUTE_TIME_LOCAL},
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{ NULL, NULL, 0 }
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};
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static int proto_time = -1;
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static int hf_time_time = -1;
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static int hf_time_response = -1;
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static gint ett_time = -1;
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/* Instead of using absolute_time_display_e as the type for
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* time_display_type, we use gint to avoid a type-punning problem
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* with prefs_register_enum_preference(). This variable is also
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* used with abs_time_secs_to_ep_str(), which _does_ take
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* an absolute_time_display_e, but gcc doesn't complain about
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* casting the gint to absolute_time_display_e */
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static gint time_display_type = ABSOLUTE_TIME_LOCAL;
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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 int
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dissect_time(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *time_tree;
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proto_item *ti;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "TIME");
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col_add_fstr(pinfo->cinfo, COL_INFO, "TIME %s",
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pinfo->srcport == pinfo->match_uint ? "Response":"Request");
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ti = proto_tree_add_item(tree, proto_time, tvb, 0, -1, ENC_NA);
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time_tree = proto_item_add_subtree(ti, ett_time);
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proto_tree_add_boolean(time_tree, hf_time_response, tvb, 0, 0, pinfo->srcport==pinfo->match_uint);
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if (pinfo->srcport == pinfo->match_uint) {
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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(pinfo->pool, delta_seconds-EPOCH_DELTA_1900_01_01_00_00_00_UTC,
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(absolute_time_display_e)time_display_type, TRUE));
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}
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return tvb_captured_length(tvb);
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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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{ &hf_time_response,
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{ "Type", "time.response",
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FT_BOOLEAN, BASE_NONE, TFS(&tfs_response_request), 0x0,
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"Response or Request", 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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module_t *time_pref ;
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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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time_pref = prefs_register_protocol(proto_time, NULL);
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prefs_register_enum_preference(time_pref,
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"display_time_type",
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"Time Display",
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"Time display type",
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(gint *)&time_display_type,
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time_display_types,
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FALSE);
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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_uint_with_preference("udp.port", TIME_PORT, time_handle);
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dissector_add_uint_with_preference("tcp.port", TIME_PORT, time_handle);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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