2018-04-24 05:08:04 +00:00
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/* packet-exablaze.c
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* Routines for dissection of Exablaze trailers
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* Copyright 2018 Exablaze
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <math.h>
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#include <epan/packet.h>
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void proto_register_exablaze(void);
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void proto_reg_handoff_exablaze(void);
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static int proto_exablaze = -1;
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static int hf_exablaze_original_fcs = -1;
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static int hf_exablaze_device = -1;
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static int hf_exablaze_port = -1;
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static int hf_exablaze_timestamp = -1;
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static int hf_exablaze_timestamp_integer = -1;
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static int hf_exablaze_timestamp_fractional = -1;
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static gint ett_exablaze = -1;
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static gint ett_exablaze_timestamp = -1;
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static int
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dissect_exablaze(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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void *data _U_)
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{
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proto_item *ti;
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proto_tree *exablaze_tree;
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proto_tree *timestamp_tree;
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guint trailer_length;
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guint fcs_length;
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guint offset;
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gboolean trailer_found;
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guint8 device;
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guint8 port;
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guint32 timestamp_sec;
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guint64 timestamp_frac;
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nstime_t timestamp;
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double timestamp_frac_double;
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struct tm *tm;
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trailer_length = tvb_reported_length(tvb);
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if (trailer_length != tvb_captured_length(tvb)) {
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/* The heuristics require the whole trailer to be captured */
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return 0;
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}
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/* Try matching with and without FCS */
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trailer_found = FALSE;
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for (fcs_length = 0; fcs_length <= 4; fcs_length += 4)
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{
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if (trailer_length < fcs_length + 16)
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continue;
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offset = trailer_length - fcs_length - 16;
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device = tvb_get_guint8(tvb, offset + 4);
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port = tvb_get_guint8(tvb, offset + 5);
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timestamp_sec = tvb_get_ntohl(tvb, offset + 6);
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timestamp_frac = tvb_get_ntoh40(tvb, offset + 10);
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/* If the capture time and timestamp differ by more than a week,
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* then this is probably not a valid Exablaze trailer */
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2018-06-29 09:13:35 +00:00
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if (timestamp_sec > (guint)pinfo->abs_ts.secs) {
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2018-04-24 05:08:04 +00:00
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if (timestamp_sec - pinfo->abs_ts.secs > 604800)
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continue;
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} else {
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if (pinfo->abs_ts.secs - timestamp_sec > 604800)
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continue;
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}
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trailer_found = TRUE;
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break;
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}
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if (!trailer_found)
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return 0;
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/* Fractional part is a 40 bit binary fraction of a second */
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timestamp.secs = timestamp_sec;
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timestamp_frac_double = ldexp((double)timestamp_frac, -40);
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timestamp.nsecs = (int)(timestamp_frac_double * 1000000000);
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ti = proto_tree_add_item(tree, proto_exablaze, tvb, offset, 16, ENC_NA);
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proto_item_append_text(ti, ", Device: %u, Port: %u, Timestamp: ",
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device, port);
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tm = localtime(×tamp.secs);
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if (tm)
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proto_item_append_text(ti, "%02u:%02u:%02.12f",
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tm->tm_hour, tm->tm_min, tm->tm_sec + timestamp_frac_double);
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else
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proto_item_append_text(ti, "<Not representable>");
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exablaze_tree = proto_item_add_subtree(ti, ett_exablaze);
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proto_tree_add_item(exablaze_tree, hf_exablaze_original_fcs, tvb,
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offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(exablaze_tree, hf_exablaze_device, tvb,
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offset + 4, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(exablaze_tree, hf_exablaze_port, tvb,
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offset + 5, 1, ENC_BIG_ENDIAN);
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ti = proto_tree_add_time(exablaze_tree, hf_exablaze_timestamp, tvb,
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offset + 6, 9, ×tamp);
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timestamp_tree = proto_item_add_subtree(ti, ett_exablaze_timestamp);
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proto_tree_add_item(timestamp_tree, hf_exablaze_timestamp_integer, tvb,
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offset + 6, 4, ENC_BIG_ENDIAN);
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proto_tree_add_double_format_value(timestamp_tree,
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hf_exablaze_timestamp_fractional, tvb, offset + 10, 5,
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timestamp_frac_double, "%.12f", timestamp_frac_double);
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return offset + 16;
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}
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void
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proto_register_exablaze(void)
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{
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static hf_register_info hf[] = {
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{
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&hf_exablaze_original_fcs,
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{
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"Original FCS", "exablaze.original_fcs",
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FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_exablaze_device,
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{
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"Device ID", "exablaze.device",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_exablaze_port,
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{
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"Port", "exablaze.port",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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},
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{
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&hf_exablaze_timestamp,
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{
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"Timestamp", "exablaze.timestamp",
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FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0, NULL, HFILL
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}
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},
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{ &hf_exablaze_timestamp_integer,
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{
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"Seconds since epoch", "exablaze.timestamp.seconds",
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FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL
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}
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},
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{ &hf_exablaze_timestamp_fractional,
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{
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"Fractional seconds",
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"exablaze.timestamp.fractional_seconds",
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FT_DOUBLE, BASE_NONE, NULL, 0x0, NULL, HFILL
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}
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}
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};
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static gint *ett[] = {
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&ett_exablaze,
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&ett_exablaze_timestamp
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};
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proto_exablaze = proto_register_protocol("Exablaze trailer", "Exablaze",
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"exablaze");
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proto_register_field_array(proto_exablaze, 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_exablaze(void)
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{
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heur_dissector_add("eth.trailer", dissect_exablaze, "Exablaze trailer",
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2020-10-07 15:30:41 +00:00
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"exablaze_eth", proto_exablaze, HEURISTIC_DISABLE);
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2018-04-24 05:08:04 +00:00
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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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