forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
483 lines
18 KiB
C
483 lines
18 KiB
C
/* packet-netanalyzer.c
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* Dissector for Hilscher netANALYZER frames.
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* Copyright 2008-2011, Hilscher GmbH, Holger Pfrommer hpfrommer[AT]hilscher.com
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*
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* Packet structure:
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* +---------------------------+
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* | Header |
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* | (4 Octets) |
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* +---------------------------+
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* | Payload |
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* . .
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* . .
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* . .
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*
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* Description:
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* The header field contains a 32-bit value in little-endian byte order.
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* The low-order 8 bits are a set of error flags for the packet:
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* 0x00000001 - MII RX_ER
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* 0x00000002 - alignment error
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* 0x00000004 - FCS error
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* 0x00000008 - frame too long
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* 0x00000010 - SFD error
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* 0x00000020 - frame shorter than 64 bytes
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* 0x00000040 - preamble shorter than 7 bytes
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* 0x00000080 - preamble longer than 7 bytes/li>
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* The next bit, 0x00000100, is set if the packet arrived on the GPIO port rather tha the Ethernet port.
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* The next bit, 0x00000200, is set if the packet was received in transparent capture mode.
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* That should never be set for LINKTYPE_NETANALYZER and should always be set for LINKTYPE_NETANALYZER_TRANSPARENT.
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* The next 4 bits, 0x00003C00, are a bitfield giving the version of the header field; the current version is 1.
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* The next 2 bits, 0x0000C000, are the capture port/GPIO number, from 0 to 3.
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* The next 12 bits, 0x0FFF0000, are the frame length, in bytes.
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* The topmost 4 bits, 0xF0000000, are reserved.
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* The payload is an Ethernet frame, beginning with the MAC header and ending with the FCS, for LINKTYPE_NETANALYZER,
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* and an Ethernet frame, beginning with the preamble and ending with the FCS, for LINKTYPE_NETANALYZER_TRANSPARENT.
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*
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald[AT]wireshark.org>
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* Copyright 1999 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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#include <epan/expert.h>
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#include <wiretap/wtap.h>
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void proto_register_netanalyzer(void);
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void proto_reg_handoff_netanalyzer(void);
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#define HEADER_SIZE 4
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#define INFO_TYPE_OFFSET 18
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#define MSK_RX_ERR 0x01
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#define MSK_ALIGN_ERR 0x02
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#define MSK_FCS_ERROR 0x04
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#define MSK_TOO_LONG 0x08
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#define MSK_SFD_ERROR 0x10
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#define MSK_SHORT_FRAME 0x20
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#define MSK_SHORT_PREAMBLE 0x40
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#define MSK_LONG_PREAMBLE 0x80
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static const char *msk_strings[] = {
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"MII RX_ER error", /* 0x01 */
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"Alignment error", /* 0x02 */
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"FCS error", /* 0x04 */
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"Frame too long", /* 0x08 */
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"No valid SFD found", /* 0x10 */
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"Frame smaller 64 bytes", /* 0x20 */
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"Preamble shorter than 7 bytes", /* 0x40 */
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"Preamble longer than 7 bytes" /* 0x80 */
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};
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#define SRT_PORT_NUM 6
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#define SRT_VERSION 2
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#define SRT_GPIO_FLAG 0
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#define MSK_PACKET_STATUS 0xff
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#define MSK_LENGTH 0x0fff
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#define MSK_TRANSPARENT_MODE 0x02
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static const value_string gpio_number[] = {
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{ 0x0, "GPIO 0" },
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{ 0x1, "GPIO 1" },
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{ 0x2, "GPIO 2" },
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{ 0x3, "GPIO 3" },
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{ 0, NULL }
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};
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static const value_string gpio_edge_vals[] = {
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{ 0x0, "rising edge" },
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{ 0x1, "falling edge" },
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{ 0, NULL }
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};
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static dissector_handle_t eth_dissector_handle;
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static gint proto_netanalyzer = -1;
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static gint hf_netanalyzer_gpio_number = -1;
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static gint hf_netanalyzer_gpio_edge = -1;
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static gint hf_netanalyzer_port = -1;
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static gint hf_netanalyzer_length = -1;
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static gint hf_netanalyzer_status = -1;
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static gint hf_netanalyzer_status_rx_err = -1;
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static gint hf_netanalyzer_status_align_err = -1;
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static gint hf_netanalyzer_status_fcs = -1;
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static gint hf_netanalyzer_status_too_long = -1;
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static gint hf_netanalyzer_status_sfd_error = -1;
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static gint hf_netanalyzer_status_short_frame = -1;
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static gint hf_netanalyzer_status_short_preamble = -1;
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static gint hf_netanalyzer_status_long_preamble = -1;
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static gint ett_netanalyzer = -1;
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static gint ett_netanalyzer_status = -1;
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static gint ett_netanalyzer_transparent = -1;
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static expert_field ei_netanalyzer_header_version_wrong = EI_INIT;
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static expert_field ei_netanalyzer_gpio_def_none = EI_INIT;
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static expert_field ei_netanalyzer_header_version_none = EI_INIT;
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static expert_field ei_netanalyzer_transparent_frame = EI_INIT;
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static expert_field ei_netanalyzer_alignment_error = EI_INIT;
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/* common routine for Ethernet and transparent mode */
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static int
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dissect_netanalyzer_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti = NULL;
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proto_tree *netanalyzer_header_tree = NULL;
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proto_item *ti_status = NULL;
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proto_tree *netanalyzer_status_tree = NULL;
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guint32 packet_status;
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guint32 port_num;
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guint32 frame_length;
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guint is_gpio;
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guint32 offset;
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guint gpio_num;
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guint gpio_edge;
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guint version;
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guint idx;
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if (tree)
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{
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/* generate netANALYZER tree */
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ti = proto_tree_add_item(tree, proto_netanalyzer, tvb, 0, HEADER_SIZE, ENC_NA);
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netanalyzer_header_tree = proto_item_add_subtree(ti, ett_netanalyzer);
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is_gpio = (tvb_get_guint8(tvb, 1) >> SRT_GPIO_FLAG) & 0x1;
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if (!is_gpio)
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{
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/* normal packet, no GPIO */
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/* decode version */
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version = (tvb_get_guint8(tvb, 1) >> SRT_VERSION) & 0xf;
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if (version != 1)
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{
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/* something is wrong */
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expert_add_info(pinfo, ti, &ei_netanalyzer_header_version_wrong);
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return FALSE;
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}
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/* decode port */
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port_num = (tvb_get_guint8(tvb, 1) >> SRT_PORT_NUM) & 0x3;
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proto_tree_add_uint(netanalyzer_header_tree, hf_netanalyzer_port, tvb, 0, 4, port_num);
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proto_item_append_text(ti, " (Port: %u, ", port_num);
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/* decode length */
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frame_length = tvb_get_letohs(tvb, 2) & MSK_LENGTH;
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proto_tree_add_uint(netanalyzer_header_tree, hf_netanalyzer_length, tvb, 0, 4, frame_length);
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proto_item_append_text(ti, "Length: %u byte%s, ", frame_length, (frame_length == 1) ? "" : "s");
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/* decode status */
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proto_item_append_text(ti, "Status: ");
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packet_status = tvb_get_guint8(tvb, 0);
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if (packet_status == 0)
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{
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ti_status = proto_tree_add_uint_format_value(netanalyzer_header_tree, hf_netanalyzer_status, tvb, 0, 1,
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packet_status, "No Error");
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proto_item_append_text(ti, "No Error)");
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}
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else
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{
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wmem_strbuf_t *strbuf;
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gboolean first = TRUE;
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ti_status = proto_tree_add_uint_format_value(netanalyzer_header_tree, hf_netanalyzer_status, tvb, 0, 1,
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packet_status, "Error present (expand tree for details)");
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strbuf = wmem_strbuf_new_label(wmem_epan_scope());
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for (idx = 0; idx < 8; idx++)
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{
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if (packet_status & (1 << idx))
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{
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if (first)
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{
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first = FALSE;
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}
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else
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{
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wmem_strbuf_append(strbuf, ", ");
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}
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wmem_strbuf_append(strbuf, msk_strings[idx]);
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}
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}
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proto_item_append_text(ti, "%s)", wmem_strbuf_get_str(strbuf));
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}
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netanalyzer_status_tree = proto_item_add_subtree(ti_status, ett_netanalyzer_status);
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proto_tree_add_item(netanalyzer_status_tree, hf_netanalyzer_status_rx_err, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(netanalyzer_status_tree, hf_netanalyzer_status_align_err, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(netanalyzer_status_tree, hf_netanalyzer_status_fcs, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(netanalyzer_status_tree, hf_netanalyzer_status_too_long, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(netanalyzer_status_tree, hf_netanalyzer_status_sfd_error, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(netanalyzer_status_tree, hf_netanalyzer_status_short_frame, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(netanalyzer_status_tree, hf_netanalyzer_status_short_preamble, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(netanalyzer_status_tree, hf_netanalyzer_status_long_preamble, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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/* decode transparent mode */
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if (tvb_get_guint8(tvb, 1) & MSK_TRANSPARENT_MODE)
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{
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proto_tree_add_expert(netanalyzer_header_tree, pinfo, &ei_netanalyzer_transparent_frame, tvb, 0, 4);
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proto_item_append_text(ti, ", Transparent Mode");
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if (packet_status & MSK_ALIGN_ERR)
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{
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proto_tree_add_expert(netanalyzer_header_tree, pinfo, &ei_netanalyzer_alignment_error, tvb, tvb_captured_length(tvb)-1, 1);
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}
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}
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}
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else
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{
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guchar *szTemp;
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/* GPIO pseudo packet */
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/* check consistency */
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if ( (tvb_get_guint8(tvb, 10) == 0x00) &&
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(tvb_get_guint8(tvb, 11) == 0x02) &&
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(tvb_get_guint8(tvb, 12) == 0xa2) &&
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(tvb_get_guint8(tvb, 13) == 0xff) &&
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(tvb_get_guint8(tvb, 14) == 0xff) &&
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(tvb_get_guint8(tvb, 15) == 0xff) &&
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(tvb_get_guint8(tvb, 16) == 0x88) &&
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(tvb_get_guint8(tvb, 17) == 0xff) &&
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(tvb_get_guint8(tvb, INFO_TYPE_OFFSET) == 0x00) )
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{
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#define MAX_BUFFER 255
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szTemp=(guchar *)wmem_alloc(wmem_epan_scope(), MAX_BUFFER);
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/* everything ok */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "netANALYZER");
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offset = INFO_TYPE_OFFSET;
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/* GPIO number */
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offset++;
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proto_tree_add_item (netanalyzer_header_tree, hf_netanalyzer_gpio_number, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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gpio_num = (tvb_get_guint8(tvb, offset) & 0x03);
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/* GPIO edge */
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offset++;
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ti = proto_tree_add_item (netanalyzer_header_tree, hf_netanalyzer_gpio_edge, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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gpio_edge = (tvb_get_guint8(tvb, offset) & 0x01);
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g_snprintf(szTemp, MAX_BUFFER,
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"GPIO event on GPIO %d (%sing edge)", gpio_num, (gpio_edge == 0x00) ? "ris" : "fall");
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s", szTemp);
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proto_item_append_text(ti, " %s", szTemp);
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}
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else
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{
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/* something is wrong */
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expert_add_info(pinfo, ti, &ei_netanalyzer_gpio_def_none);
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}
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return FALSE;
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}
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}
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return TRUE;
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}
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/* Ethernet capture mode */
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static int
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dissect_netanalyzer(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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tvbuff_t *next_tvb;
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if (tvb_reported_length(tvb) >= 4)
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{
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/* generate tvb subset for Ethernet frame */
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if (dissect_netanalyzer_common(tvb, pinfo, tree))
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{
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/* hand off to eth dissector with the new tvb subset */
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next_tvb = tvb_new_subset_remaining(tvb, 4);
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call_dissector(eth_dissector_handle, next_tvb, pinfo, tree);
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}
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}
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else
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{
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/* something is wrong */
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proto_tree_add_expert_format(tree, pinfo, &ei_netanalyzer_header_version_none, tvb, 4, -1,
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"netANALYZER - No netANALYZER header found");
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}
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return tvb_captured_length(tvb);
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}
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/* Transparent capture mode */
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static int
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dissect_netanalyzer_transparent(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *transparent_payload_tree = NULL;
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tvbuff_t *next_tvb;
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if (tvb_reported_length(tvb) >= 4)
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{
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/* generate tvb subset for Ethernet frame */
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if (dissect_netanalyzer_common(tvb, pinfo, tree))
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{
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/* do not hand off transparent packet for further Ethernet dissectors
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* as normally the transparent mode is used for low level analysis
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* where dissecting the frame's content wouldn't make much sense
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* use data dissector instead */
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transparent_payload_tree = proto_tree_add_subtree(tree, tvb, 4, tvb_captured_length(tvb)-4,
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ett_netanalyzer_transparent, NULL, "Raw packet data");
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next_tvb = tvb_new_subset_remaining(tvb, 4);
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call_data_dissector(next_tvb, pinfo, transparent_payload_tree);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "netANALYZER");
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col_set_str(pinfo->cinfo, COL_INFO, "Frame captured in transparent mode");
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}
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}
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else
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{
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/* something is wrong */
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proto_tree_add_expert_format(tree, pinfo, &ei_netanalyzer_header_version_none, tvb, 4, -1,
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"netANALYZER transparent mode - No netANALYZER header found");
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}
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return tvb_captured_length(tvb);
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}
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void proto_register_netanalyzer(void)
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{
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static hf_register_info hf[] = {
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{ &hf_netanalyzer_gpio_number,
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{ "Event on", "netanalyzer.gpio_event.gpio_number",
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FT_UINT8, BASE_HEX, VALS(gpio_number), 0x0,
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"Event on GPIO number", HFILL }
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},
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{ &hf_netanalyzer_gpio_edge,
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{ "Event type", "netanalyzer.gpio_event.gpio_edge",
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FT_UINT8, BASE_HEX, VALS(gpio_edge_vals), 0x0,
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"Edge of GPIO event", HFILL }
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},
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{ &hf_netanalyzer_port,
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{ "Reception Port", "netanalyzer.port",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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"netANALYZER reception port", HFILL }
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},
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{ &hf_netanalyzer_length,
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{ "Ethernet frame length", "netanalyzer.framelen",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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"Actual Ethernet frame length", HFILL }
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},
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{ &hf_netanalyzer_status,
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{ "Status", "netanalyzer.packetstatus",
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FT_UINT8, BASE_HEX, NULL, MSK_PACKET_STATUS,
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"Status of Ethernet frame", HFILL }
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},
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{ &hf_netanalyzer_status_rx_err,
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{ "MII RX_ER error", "netanalyzer.packetstatus.rx_er",
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FT_BOOLEAN, 8, NULL, MSK_RX_ERR,
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"RX_ER detected in frame", HFILL }
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},
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{ &hf_netanalyzer_status_align_err,
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{ "Alignment error", "netanalyzer.packetstatus.alignment_error",
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FT_BOOLEAN, 8, NULL, MSK_ALIGN_ERR,
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NULL, HFILL }
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},
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{ &hf_netanalyzer_status_fcs,
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{ "FCS error", "netanalyzer.packetstatus.fcs_error",
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FT_BOOLEAN, 8, NULL, MSK_FCS_ERROR,
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NULL, HFILL }
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},
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{ &hf_netanalyzer_status_too_long,
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{ "Frame too long", "netanalyzer.packetstatus.too_long",
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FT_BOOLEAN, 8, NULL, MSK_TOO_LONG,
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"Frame too long (capture truncated)", HFILL }
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},
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{ &hf_netanalyzer_status_sfd_error,
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{ "No valid SFD found", "netanalyzer.packetstatus.sfd_error",
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FT_BOOLEAN, 8, NULL, MSK_SFD_ERROR,
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"SDF error detected in frame", HFILL }
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},
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{ &hf_netanalyzer_status_short_frame,
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{ "Frame smaller 64 bytes", "netanalyzer.packetstatus.short_frame",
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FT_BOOLEAN, 8, NULL, MSK_SHORT_FRAME,
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NULL, HFILL }
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},
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{ &hf_netanalyzer_status_short_preamble,
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{ "Preamble shorter than 7 bytes", "netanalyzer.packetstatus.short_preamble",
|
|
FT_BOOLEAN, 8, NULL, MSK_SHORT_PREAMBLE,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_netanalyzer_status_long_preamble,
|
|
{ "Preamble longer than 7 bytes", "netanalyzer.packetstatus.long_preamble",
|
|
FT_BOOLEAN, 8, NULL, MSK_LONG_PREAMBLE,
|
|
NULL, HFILL }
|
|
},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_netanalyzer,
|
|
&ett_netanalyzer_status,
|
|
&ett_netanalyzer_transparent,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_netanalyzer_header_version_wrong, { "netanalyzer.header_version.wrong", PI_PROTOCOL, PI_ERROR, "Wrong netANALYZER header version", EXPFILL }},
|
|
{ &ei_netanalyzer_gpio_def_none, { "netanalyzer.gpio_def_none", PI_MALFORMED, PI_ERROR, "No valid netANALYZER GPIO definition found", EXPFILL }},
|
|
{ &ei_netanalyzer_header_version_none, { "netanalyzer.header_version.none", PI_MALFORMED, PI_ERROR, "No netANALYZER header found", EXPFILL }},
|
|
{ &ei_netanalyzer_transparent_frame, { "netanalyzer.transparent_frame", PI_PROTOCOL, PI_NOTE, "This frame was captured in transparent mode", EXPFILL }},
|
|
{ &ei_netanalyzer_alignment_error, { "netanalyzer.alignment_error", PI_PROTOCOL, PI_WARN, "Displayed frame data contains additional nibble due to alignment error (upper nibble is not valid)", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_netanalyzer;
|
|
|
|
proto_netanalyzer = proto_register_protocol (
|
|
"netANALYZER", /* name */
|
|
"netANALYZER", /* short name */
|
|
"netanalyzer" ); /* abbrev */
|
|
|
|
proto_register_field_array(proto_netanalyzer, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_netanalyzer = expert_register_protocol(proto_netanalyzer);
|
|
expert_register_field_array(expert_netanalyzer, ei, array_length(ei));
|
|
|
|
}
|
|
|
|
|
|
void proto_reg_handoff_netanalyzer(void)
|
|
{
|
|
dissector_handle_t netana_handle;
|
|
dissector_handle_t netana_handle_transparent;
|
|
|
|
eth_dissector_handle = find_dissector_add_dependency("eth_withfcs", proto_netanalyzer);
|
|
|
|
netana_handle = create_dissector_handle(dissect_netanalyzer, proto_netanalyzer);
|
|
netana_handle_transparent = create_dissector_handle(dissect_netanalyzer_transparent, proto_netanalyzer);
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_NETANALYZER, netana_handle);
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_NETANALYZER_TRANSPARENT, netana_handle_transparent);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|