forked from osmocom/wireshark
248 lines
7.5 KiB
C
248 lines
7.5 KiB
C
/* packet-metamako.c
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* Routines for dissection of Metamako trailers. Forked from
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* packet-vssmonitoring.c on 20th December, 2015.
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* See https://www.metamako.com for further details.
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*
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* Copyright VSS-Monitoring 2011
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* Copyright Metamako LP 2015
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*
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* 20111205 - First edition by Sake Blok (sake.blok@SYN-bit.nl)
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* 20151220 - Forked to become packet-metamako.c
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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void proto_register_metamako(void);
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void proto_reg_handoff_metamako(void);
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static int proto_metamako = -1;
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static int hf_metamako_origfcs = -1;
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static int hf_metamako_time = -1;
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static int hf_metamako_flags = -1;
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static int hf_metamako_srcport = -1;
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static int hf_metamako_srcdevice = -1;
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static int hf_metamako_tdiff = -1;
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static int hf_metamako_flags_orig_fcs_vld = -1;
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static int hf_metamako_reserved = -1;
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static gint ett_metamako = -1;
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static gint ett_metamako_timestamp = -1;
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static gint ett_metamako_flags = -1;
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static const int * flags[] = {
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&hf_metamako_flags_orig_fcs_vld,
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&hf_metamako_reserved,
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NULL
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};
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static int
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dissect_metamako(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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proto_tree *ti, *item;
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proto_tree *metamako_tree, *timestamp_tree;
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guint offset = 0;
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guint trailer_len;
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nstime_t metamako_time, timediff;
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guint8 metamako_srcport;
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guint16 metamako_srcdevice;
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struct tm *tmp;
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/* First get the length of the trailer */
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trailer_len = tvb_reported_length(tvb);
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/* The Metamako trailer is made up of:
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4 bytes -- original FCS
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4 bytes -- seconds
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4 bytes -- nanoseconds
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1 byte -- flags
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2 bytes -- device ID
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1 byte -- port ID
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4 bytes -- New (valid) FCS
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*/
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/* The ethernet trailer may or may not have an FCS */
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if ( (trailer_len != 20) && (trailer_len != 16) )
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return 0;
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/* If we have less than 12 bytes captured, we can't
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read the timestamp to confirm the heuristic */
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if( tvb_captured_length(tvb) < 12)
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return 0;
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/* Further validity checks to ensure that this is a Metamako-style timestamp trailer */
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metamako_time.secs = tvb_get_ntohl(tvb, offset + 4);
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metamako_time.nsecs = tvb_get_ntohl(tvb, offset + 8);
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nstime_delta(&timediff, &metamako_time, &pinfo->fd->abs_ts);
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/* The timestamp will be based on the uptime until the TAP is completely booted,
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* this takes about 60s, but use 1 hour to be sure
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*/
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/* Probably just null data to fill up a short frame.
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* FIXME: Should be made even stricter.
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*/
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if (metamako_time.secs == 0)
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return 0;
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if (metamako_time.secs > 3600) {
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/* Check whether the timestamp in the PCAP header and the timestamp trailer
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* differ less than 30 days, otherwise, this might not be a timestamp trailer
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* timestamp
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*/
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if ( metamako_time.secs > pinfo->fd->abs_ts.secs ) {
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if ( metamako_time.secs - pinfo->fd->abs_ts.secs > 2592000 ) /* 30 days */
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return 0;
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} else {
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if ( pinfo->fd->abs_ts.secs - metamako_time.secs > 2592000 ) /* 30 days */
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return 0;
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}
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}
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/* The nanoseconds field should be less than 1000000000
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*/
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if ( metamako_time.nsecs >= 1000000000 )
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return 0;
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/* All systems are go, lets dissect the trailer */
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ti = proto_tree_add_item(tree, proto_metamako, tvb, 0, (trailer_len & 0xb), ENC_NA);
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metamako_tree = proto_item_add_subtree(ti, ett_metamako);
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/* Original FCS */
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proto_tree_add_item(metamako_tree, hf_metamako_origfcs, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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/* Timestamp */
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item = proto_tree_add_time(metamako_tree, hf_metamako_time, tvb, offset, 8, &metamako_time);
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timestamp_tree = proto_item_add_subtree(item, ett_metamako_timestamp);
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tmp = localtime(&metamako_time.secs);
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if (tmp)
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proto_item_append_text(ti, ", Timestamp: %02d:%02d:%02d.%09ld",
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec,(long)metamako_time.nsecs);
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else
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proto_item_append_text(ti, ", Timestamp: <Not representable>");
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item = proto_tree_add_time(timestamp_tree, hf_metamako_tdiff, tvb, offset, 8, &timediff);
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PROTO_ITEM_SET_GENERATED(item);
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offset += 8;
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proto_tree_add_bitmask(metamako_tree, tvb, offset, hf_metamako_flags, ett_metamako_flags, flags, ENC_BIG_ENDIAN);
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offset++;
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/* Source device */
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metamako_srcdevice = tvb_get_ntohs(tvb, offset);
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proto_tree_add_item(metamako_tree, hf_metamako_srcdevice, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_item_append_text(ti, ", Source Device: %d", metamako_srcdevice);
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/* Source port */
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metamako_srcport = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(metamako_tree, hf_metamako_srcport, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset++;
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proto_item_append_text(ti, ", Source Port: %d", metamako_srcport);
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return offset;
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}
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void
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proto_register_metamako(void)
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{
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static hf_register_info hf[] = {
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{ &hf_metamako_origfcs, {
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"Original FCS", "metamako.orig_fcs",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_metamako_time, {
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"Time Stamp", "metamako.time",
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FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
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NULL, HFILL }},
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{&hf_metamako_flags, {
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"Flags", "metamako.flags",
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FT_UINT8, BASE_HEX, NULL, 0x0,
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NULL, HFILL}},
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{&hf_metamako_flags_orig_fcs_vld, {
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"Original FCS Valid", "metamako.flags.orig_fcs_vld",
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FT_BOOLEAN, 8, TFS(&tfs_valid_invalid), 0x01,
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NULL, HFILL}},
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{&hf_metamako_reserved, {
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"Reserved", "metamako.reserved",
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FT_UINT8, BASE_HEX, NULL, 0xFE,
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NULL, HFILL}},
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{ &hf_metamako_srcdevice, {
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"Source Device ID", "metamako.srcdevice",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_metamako_srcport, {
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"Source Port", "metamako.srcport",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_metamako_tdiff, {
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"Time Difference", "metamako.tdiff",
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FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0,
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"Difference from capture timestamp", HFILL }}
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};
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static gint *ett[] = {
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&ett_metamako,
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&ett_metamako_timestamp,
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&ett_metamako_flags
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};
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proto_metamako = proto_register_protocol("Metamako ethernet trailer", "Metamako", "metamako");
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proto_register_field_array(proto_metamako, 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_metamako(void)
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{
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heur_dissector_add("eth.trailer", dissect_metamako, "Metamako ethernet trailer", "metamako_eth", proto_metamako, HEURISTIC_ENABLE);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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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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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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