2d1bb39121
there are many reasons why some protocols actually need to be able to access the pinfo structure while determining the pdu size svn path=/trunk/; revision=19751
457 lines
14 KiB
C
457 lines
14 KiB
C
/* packet-lsc.c
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* Routines for Pegasus LSC packet disassembly
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* Copyright 2006, Sean Sheedy <seansh@users.sourceforge.net>
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/emem.h>
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#include <epan/prefs.h>
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#include <packet-tcp.h>
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/* Forward declaration we need below */
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void proto_reg_handoff_lsc(void);
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#define LSC_PAUSE 0x01
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#define LSC_RESUME 0x02
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#define LSC_STATUS 0x03
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#define LSC_RESET 0x04
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#define LSC_JUMP 0x05
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#define LSC_PLAY 0x06
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#define LSC_DONE 0x40
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#define LSC_PAUSE_REPLY 0x81
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#define LSC_RESUME_REPLY 0x82
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#define LSC_STATUS_REPLY 0x83
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#define LSC_RESET_REPLY 0x84
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#define LSC_JUMP_REPLY 0x85
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#define LSC_PLAY_REPLY 0x86
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#define isReply(o) ((o) & 0x80)
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static const value_string op_code_vals[] = {
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{ LSC_PAUSE, "LSC_PAUSE" },
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{ LSC_RESUME, "LSC_RESUME" },
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{ LSC_STATUS, "LSC_STATUS" },
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{ LSC_RESET, "LSC_RESET" },
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{ LSC_JUMP, "LSC_JUMP" },
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{ LSC_PLAY, "LSC_PLAY" },
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{ LSC_DONE, "LSC_DONE" },
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{ LSC_PAUSE_REPLY, "LSC_PAUSE_REPLY" },
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{ LSC_RESUME_REPLY, "LSC_RESUME_REPLY" },
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{ LSC_STATUS_REPLY, "LSC_STATUS_REPLY" },
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{ LSC_RESET_REPLY, "LSC_RESET_REPLY" },
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{ LSC_JUMP_REPLY, "LSC_JUMP_REPLY" },
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{ LSC_PLAY_REPLY, "LSC_PLAY_REPLY" },
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{ 0, NULL }
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};
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#define LSC_OPCODE_LEN 3 /* Length to find op code */
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#define LSC_MIN_LEN 8 /* Minimum packet length */
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/* Length of each packet type */
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#define LSC_PAUSE_LEN 12
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#define LSC_RESUME_LEN 16
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#define LSC_STATUS_LEN 8
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#define LSC_RESET_LEN 8
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#define LSC_JUMP_LEN 20
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#define LSC_PLAY_LEN 20
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#define LSC_REPLY_LEN 17
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static const value_string status_code_vals[] = {
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{ 0x00, "LSC_OK" },
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{ 0x10, "LSC_BAD_REQUEST" },
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{ 0x11, "LSC_BAD_STREAM" },
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{ 0x12, "LSC_WRONG_STATE" },
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{ 0x13, "LSC_UNKNOWN" },
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{ 0x14, "LSC_NO_PERMISSION" },
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{ 0x15, "LSC_BAD_PARAM" },
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{ 0x16, "LSC_NO_IMPLEMENT" },
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{ 0x17, "LSC_NO_MEMORY" },
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{ 0x18, "LSC_IMP_LIMIT" },
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{ 0x19, "LSC_TRANSIENT" },
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{ 0x1a, "LSC_NO_RESOURCES" },
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{ 0x20, "LSC_SERVER_ERROR" },
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{ 0x21, "LSC_SERVER_FAILURE" },
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{ 0x30, "LSC_BAD_SCALE" },
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{ 0x31, "LSC_BAD_START" },
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{ 0x32, "LSC_BAD_STOP" },
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{ 0x40, "LSC_MPEG_DELIVERY" },
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{ 0, NULL }
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};
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static const value_string mode_vals[] = {
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{ 0x00, "O - Open Mode" },
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{ 0x01, "P - Pause Mode" },
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{ 0x02, "ST - Search Transport" },
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{ 0x03, "T - Transport" },
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{ 0x04, "TP - Transport Pause" },
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{ 0x05, "STP - Search Transport Pause" },
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{ 0x06, "PST - Pause Search Transport" },
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{ 0x07, "EOS - End of Stream" },
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{ 0, NULL }
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};
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/* Initialize the protocol and registered fields */
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static int proto_lsc = -1;
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static int hf_lsc_version = -1;
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static int hf_lsc_trans_id = -1;
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static int hf_lsc_op_code = -1;
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static int hf_lsc_status_code = -1;
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static int hf_lsc_stream_handle = -1;
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static int hf_lsc_start_npt = -1;
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static int hf_lsc_stop_npt = -1;
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static int hf_lsc_current_npt = -1;
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static int hf_lsc_scale_num = -1;
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static int hf_lsc_scale_denom = -1;
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static int hf_lsc_mode = -1;
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/* Preferences */
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static guint global_lsc_port = 0;
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static guint lsc_port = 0;
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/* Initialize the subtree pointers */
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static gint ett_lsc = -1;
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/* Code to actually dissect the packets */
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static void
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dissect_lsc_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *lsc_tree;
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guint8 op_code;
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guint32 stream;
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guint expected_len;
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/* Protocol is LSC, packet summary is not yet known */
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "LSC");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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/* Too little data? */
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if (tvb->length < LSC_MIN_LEN)
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{
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if (check_col(pinfo->cinfo, COL_INFO))
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col_set_str(pinfo->cinfo, COL_INFO, "[Too short]");
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return;
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}
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/* Get the op code */
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op_code = tvb_get_guint8(tvb, 2);
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/* And the stream handle */
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stream = tvb_get_ntohl(tvb, 4);
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/* Check the data length against what we actually received */
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switch (op_code)
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{
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case LSC_PAUSE:
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expected_len = LSC_PAUSE_LEN;
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break;
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case LSC_RESUME:
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expected_len = LSC_RESUME_LEN;
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break;
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case LSC_STATUS:
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expected_len = LSC_STATUS_LEN;
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break;
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case LSC_RESET:
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expected_len = LSC_RESET_LEN;
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break;
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case LSC_JUMP:
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expected_len = LSC_JUMP_LEN;
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break;
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case LSC_PLAY:
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expected_len = LSC_PLAY_LEN;
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break;
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case LSC_DONE:
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case LSC_PAUSE_REPLY:
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case LSC_RESUME_REPLY:
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case LSC_STATUS_REPLY:
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case LSC_RESET_REPLY:
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case LSC_JUMP_REPLY:
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case LSC_PLAY_REPLY:
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expected_len = LSC_REPLY_LEN;
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break;
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default:
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/* Unrecognized op code */
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expected_len = LSC_MIN_LEN;
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break;
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}
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/* Display the op code in the summary */
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s, session %.8u",
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val_to_str(op_code, op_code_vals, "Unknown op code (0x%x)"),
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stream);
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if (tvb->length < expected_len)
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col_append_str(pinfo->cinfo, COL_INFO, " [Too short]");
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else if (tvb->length > expected_len)
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col_append_str(pinfo->cinfo, COL_INFO, " [Too long]");
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}
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if (tree) {
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/* Create display subtree for the protocol */
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ti = proto_tree_add_item(tree, proto_lsc, tvb, 0, -1, FALSE);
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lsc_tree = proto_item_add_subtree(ti, ett_lsc);
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/* Add already fetched items to the tree */
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proto_tree_add_uint(lsc_tree, hf_lsc_op_code, tvb, 2, 1, op_code);
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proto_tree_add_uint_format_value(lsc_tree, hf_lsc_stream_handle, tvb, 4, 4,
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stream, "%.8u", stream);
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/* Add rest of LSC header */
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proto_tree_add_uint(lsc_tree, hf_lsc_version, tvb, 0, 1,
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tvb_get_guint8(tvb, 0));
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proto_tree_add_uint(lsc_tree, hf_lsc_trans_id, tvb, 1, 1,
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tvb_get_guint8(tvb, 1));
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/* Only replies contain a status code */
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if (isReply(op_code))
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proto_tree_add_uint(lsc_tree, hf_lsc_status_code, tvb, 3, 1,
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tvb_get_guint8(tvb, 3));
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/* Add op code specific parts */
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switch (op_code)
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{
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case LSC_PAUSE:
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proto_tree_add_int(lsc_tree, hf_lsc_stop_npt, tvb, 8, 4,
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tvb_get_ntohl(tvb, 8));
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break;
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case LSC_RESUME:
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proto_tree_add_int(lsc_tree, hf_lsc_start_npt, tvb, 8, 4,
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tvb_get_ntohl(tvb, 8));
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proto_tree_add_int(lsc_tree, hf_lsc_scale_num, tvb, 12, 2,
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tvb_get_ntohs(tvb, 12));
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proto_tree_add_uint(lsc_tree, hf_lsc_scale_denom, tvb, 14, 2,
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tvb_get_ntohs(tvb, 14));
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break;
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case LSC_JUMP:
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case LSC_PLAY:
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proto_tree_add_int(lsc_tree, hf_lsc_start_npt, tvb, 8, 4,
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tvb_get_ntohl(tvb, 8));
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proto_tree_add_int(lsc_tree, hf_lsc_stop_npt, tvb, 12, 4,
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tvb_get_ntohl(tvb, 12));
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proto_tree_add_int(lsc_tree, hf_lsc_scale_num, tvb, 16, 2,
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tvb_get_ntohs(tvb, 16));
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proto_tree_add_uint(lsc_tree, hf_lsc_scale_denom, tvb, 18, 2,
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tvb_get_ntohs(tvb, 18));
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break;
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case LSC_DONE:
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case LSC_PAUSE_REPLY:
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case LSC_RESUME_REPLY:
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case LSC_STATUS_REPLY:
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case LSC_RESET_REPLY:
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case LSC_JUMP_REPLY:
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case LSC_PLAY_REPLY:
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proto_tree_add_int(lsc_tree, hf_lsc_current_npt, tvb, 8, 4,
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tvb_get_ntohl(tvb, 8));
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proto_tree_add_int(lsc_tree, hf_lsc_scale_num, tvb, 12, 2,
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tvb_get_ntohs(tvb, 12));
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proto_tree_add_uint(lsc_tree, hf_lsc_scale_denom, tvb, 14, 2,
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tvb_get_ntohs(tvb, 14));
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proto_tree_add_uint(lsc_tree, hf_lsc_mode, tvb, 16, 1,
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tvb_get_guint8(tvb, 16));
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break;
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default:
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break;
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}
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}
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}
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/* Decode LSC over UDP */
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static void
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dissect_lsc_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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dissect_lsc_common(tvb, pinfo, tree);
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}
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/* Determine length of LSC message */
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static guint
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get_lsc_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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guint8 op_code;
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guint pdu_len;
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/* Get the op code */
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op_code = tvb_get_guint8(tvb, offset + 2);
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switch (op_code)
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{
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case LSC_PAUSE:
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pdu_len = LSC_PAUSE_LEN;
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break;
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case LSC_RESUME:
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pdu_len = LSC_RESUME_LEN;
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break;
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case LSC_STATUS:
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pdu_len = LSC_STATUS_LEN;
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break;
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case LSC_RESET:
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pdu_len = LSC_RESET_LEN;
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break;
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case LSC_JUMP:
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pdu_len = LSC_JUMP_LEN;
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break;
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case LSC_PLAY:
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pdu_len = LSC_PLAY_LEN;
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break;
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case LSC_DONE:
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case LSC_PAUSE_REPLY:
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case LSC_RESUME_REPLY:
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case LSC_STATUS_REPLY:
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case LSC_RESET_REPLY:
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case LSC_JUMP_REPLY:
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case LSC_PLAY_REPLY:
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pdu_len = LSC_REPLY_LEN;
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break;
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default:
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/* Unrecognized op code */
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pdu_len = LSC_OPCODE_LEN;
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break;
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}
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return pdu_len;
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}
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/* Decode LSC over TCP */
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static void
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dissect_lsc_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tcp_dissect_pdus(tvb, pinfo, tree, TRUE, LSC_OPCODE_LEN, get_lsc_pdu_len,
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dissect_lsc_common);
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}
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/* Register the protocol with Ethereal */
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void
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proto_register_lsc(void)
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{
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module_t *lsc_module;
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/* Setup list of header fields */
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static hf_register_info hf[] = {
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{ &hf_lsc_version,
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{ "Version", "lsc.version",
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FT_UINT8, BASE_DEC, NULL, 0,
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"Version of the Pegasus LSC protocol", HFILL }
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},
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{ &hf_lsc_trans_id,
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{ "Transaction ID", "lsc.trans_id",
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FT_UINT8, BASE_DEC, NULL, 0,
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"Transaction ID", HFILL }
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},
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{ &hf_lsc_op_code,
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{ "Op Code", "lsc.op_code",
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FT_UINT8, BASE_HEX, VALS(op_code_vals), 0,
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"Operation Code", HFILL }
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},
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{ &hf_lsc_status_code,
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{ "Status Code", "lsc.status_code",
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FT_UINT8, BASE_HEX, VALS(status_code_vals), 0,
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"Status Code", HFILL }
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},
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{ &hf_lsc_stream_handle,
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{ "Stream Handle", "lsc.stream_handle",
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FT_UINT32, BASE_DEC, NULL, 0,
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"Stream identification handle", HFILL }
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},
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{ &hf_lsc_start_npt,
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{ "Start NPT", "lsc.start_npt",
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FT_INT32, BASE_DEC, NULL, 0,
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"Start Time (milliseconds)", HFILL }
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},
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{ &hf_lsc_stop_npt,
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{ "Stop NPT", "lsc.stop_npt",
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FT_INT32, BASE_DEC, NULL, 0,
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"Stop Time (milliseconds)", HFILL }
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},
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{ &hf_lsc_current_npt,
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{ "Current NPT", "lsc.current_npt",
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FT_INT32, BASE_DEC, NULL, 0,
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"Current Time (milliseconds)", HFILL }
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},
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{ &hf_lsc_scale_num,
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{ "Scale Numerator", "lsc.scale_num",
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FT_INT16, BASE_DEC, NULL, 0,
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"Scale Numerator", HFILL }
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},
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{ &hf_lsc_scale_denom,
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{ "Scale Denominator", "lsc.scale_denum",
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FT_UINT16, BASE_DEC, NULL, 0,
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"Scale Denominator", HFILL }
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},
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{ &hf_lsc_mode,
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{ "Server Mode", "lsc.mode",
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FT_UINT8, BASE_HEX, VALS(mode_vals), 0,
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"Current Server Mode", HFILL }
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}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_lsc,
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};
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/* Register the protocol name and description */
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proto_lsc = proto_register_protocol("Pegasus Lightweight Stream Control",
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"LSC", "lsc");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_lsc, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register preferences module */
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lsc_module = prefs_register_protocol(proto_lsc, proto_reg_handoff_lsc);
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/* Register preferences */
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prefs_register_uint_preference(lsc_module, "port",
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"LSC Port",
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"Set the TCP or UDP port for Pegasus LSC messages",
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10, &global_lsc_port);
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}
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void
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proto_reg_handoff_lsc(void)
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{
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dissector_handle_t lsc_udp_handle;
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dissector_handle_t lsc_tcp_handle;
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lsc_udp_handle = create_dissector_handle(dissect_lsc_udp, proto_lsc);
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lsc_tcp_handle = create_dissector_handle(dissect_lsc_tcp, proto_lsc);
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/* Set the port number */
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lsc_port = global_lsc_port;
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dissector_add("udp.port", lsc_port, lsc_udp_handle);
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dissector_add("tcp.port", lsc_port, lsc_tcp_handle);
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}
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