forked from osmocom/wireshark
![Evan Huus](/assets/img/avatar_default.png)
(getting really close!) Change-Id: Ibf22a5f727c4dc0070b78144a4b0ab8e0c5e1bce Reviewed-on: https://code.wireshark.org/review/9081 Reviewed-by: Evan Huus <eapache@gmail.com>
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 dissector_handle_t data_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 void
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dissect_netanalyzer(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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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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}
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/* Transparent capture mode */
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static void
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dissect_netanalyzer_transparent(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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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_dissector(data_dissector_handle, 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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}
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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",
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FT_BOOLEAN, 8, NULL, MSK_SHORT_PREAMBLE,
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NULL, HFILL }
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},
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{ &hf_netanalyzer_status_long_preamble,
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{ "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("eth_withfcs");
|
|
data_dissector_handle = find_dissector("data");
|
|
|
|
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:
|
|
*/
|