/* packet-synergy.c
 * Routines for synergy dissection
 * Copyright 2005, Vasanth Manickam <vasanthm@gmail.com>
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>

#include <epan/dissectors/packet-tcp.h>

void proto_register_synergy(void);
void proto_reg_handoff_synergy(void);

#define SYNERGY_PORT        24800 /* Not IANA registered */

static int proto_synergy = -1;

static int hf_synergy_packet_len = -1;
static int hf_synergy_packet_type = -1;

static int hf_synergy_unknown = -1;
static int hf_synergy_handshake = -1;
static int hf_synergy_handshake_majorversion = -1;
static int hf_synergy_handshake_minorversion = -1;
static int hf_synergy_handshake_clientname = -1;

static int hf_synergy_cbye = -1;

static int hf_synergy_cinn = -1;
static int hf_synergy_cinn_x = -1;
static int hf_synergy_cinn_y = -1;
static int hf_synergy_cinn_sequence = -1;
static int hf_synergy_cinn_modifiermask = -1;

static int hf_synergy_cout = -1;

static int hf_synergy_cclp = -1;
static int hf_synergy_cclp_clipboardidentifier = -1;
static int hf_synergy_cclp_sequencenumber = -1;

static int hf_synergy_csec = -1;

static int hf_synergy_crop = -1;

static int hf_synergy_ciak = -1;

static int hf_synergy_dkdn = -1;
static int hf_synergy_dkdn_keyid = -1;
static int hf_synergy_dkdn_keymodifiermask = -1;
static int hf_synergy_dkdn_keybutton = -1;

static int hf_synergy_dkrp = -1;
static int hf_synergy_dkrp_keyid = -1;
static int hf_synergy_dkrp_keymodifiermask = -1;
static int hf_synergy_dkrp_numberofrepeats = -1;
static int hf_synergy_dkrp_keybutton = -1;

static int hf_synergy_dkup = -1;
static int hf_synergy_dkup_keyid = -1;
static int hf_synergy_dkup_keymodifiermask = -1;
static int hf_synergy_dkup_keybutton = -1;

static int hf_synergy_dmdn = -1;
static int hf_synergy_dmup = -1;

static int hf_synergy_dmmv = -1;
static int hf_synergy_dmmv_x = -1;
static int hf_synergy_dmmv_y = -1;

static int hf_synergy_dmrm = -1;
static int hf_synergy_dmrm_x = -1;
static int hf_synergy_dmrm_y = -1;

static int hf_synergy_dmwm = -1;

static int hf_synergy_dclp = -1;
static int hf_synergy_dclp_clipboardidentifier = -1;
static int hf_synergy_dclp_sequencenumber = -1;
static int hf_synergy_dclp_clipboarddata = -1;

static int hf_synergy_dinf = -1;
static int hf_synergy_dinf_clp = -1;
static int hf_synergy_dinf_ctp= -1;
static int hf_synergy_dinf_wsp = -1;
static int hf_synergy_dinf_hsp = -1;
static int hf_synergy_dinf_swz = -1;
static int hf_synergy_dinf_x = -1;
static int hf_synergy_dinf_y = -1;

static int hf_synergy_dsop = -1;

static int hf_synergy_qinf = -1;

static int hf_synergy_eicv = -1;
static int hf_synergy_eicv_majorversion = -1;
static int hf_synergy_eicv_minorversion = -1;

static int hf_synergy_ebsy = -1;

static int hf_synergy_eunk = -1;

static int hf_synergy_ebad = -1;

/* Initialize the subtree pointers */
static gint ett_synergy = -1;

static dissector_handle_t synergy_handle;

static void dissect_synergy_handshake(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_cinn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_cclp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_dkdn(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_dkrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_dkup(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_dmmv(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_dmrm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_dclp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_dinf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);
static void dissect_synergy_eicv(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,gint offset);


/* Code to dissect a single Synergy packet */
static int
dissect_synergy_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "synergy");
    col_clear(pinfo->cinfo, COL_INFO);

    if (tree) {
        gint offset=0;
        char buffer[4+1];
        proto_item *ti = NULL;
        proto_tree *synergy_tree = NULL;
        ti = proto_tree_add_protocol_format(tree, proto_synergy, tvb, 0, -1,"Synergy Protocol");
        synergy_tree = proto_item_add_subtree(ti, ett_synergy);

        proto_tree_add_item(synergy_tree,hf_synergy_packet_len,tvb,offset,4,ENC_BIG_ENDIAN);

        /* First 4 bytes of the payload - either "Syne" or a packet type. */
        tvb_get_raw_bytes_as_string(tvb, offset+4, buffer, sizeof buffer);

        if(strncmp(buffer,"Syne",4)==0) {
            /* OK, is it 7 bytes of "Synergy"? */
            if (tvb_strneql(tvb,offset+4,"rgy",3) == 0) {
                /* Yes - dissect as a handshake. */
                dissect_synergy_handshake(tvb,pinfo,synergy_tree,offset+11);
            } else {
                /* No - dissect as unknown. */
                proto_tree_add_item(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,ENC_ASCII|ENC_NA);
                proto_tree_add_item(synergy_tree,hf_synergy_unknown,tvb,offset+8,-1,ENC_NA);
            }
            return tvb_captured_length(tvb);
        }

        if(strncmp(buffer,"CNOP",4)==0)
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"No operation (%s)",buffer);
        else if(strncmp(buffer,"CALV",4)==0)
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Keep Alive (%s)",buffer);
        else if(strncmp(buffer,"CBYE",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Close Connection (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_cbye,tvb,offset+8,-1,ENC_NA);
        } else if(strncmp(buffer,"CINN",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Enter Screen (%s)",buffer);
            dissect_synergy_cinn(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"COUT",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Leave Screen (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_cout,tvb,offset+8,-1,ENC_NA);
        } else if(strncmp(buffer,"CCLP",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Grab Clipboard (%s)",buffer);
            dissect_synergy_cclp(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"CSEC",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Screen Saver Change (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_csec,tvb,offset+8,1,ENC_BIG_ENDIAN);
        } else if(strncmp(buffer,"CROP",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Reset Options (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_crop,tvb,offset+8,-1,ENC_NA);
        } else if(strncmp(buffer,"CIAK",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Resolution Change Acknowledgment (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_ciak,tvb,offset+8,-1,ENC_NA);
        } else if(strncmp(buffer,"DKDN",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Key Pressed (%s)",buffer);
            dissect_synergy_dkdn(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"DKRP",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Key Auto-Repeat (%s)",buffer);
            dissect_synergy_dkrp(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"DKUP",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Key Released (%s)",buffer);
            dissect_synergy_dkup(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"DMDN",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Mouse Button Pressed (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_dmdn,tvb,offset+8,1,ENC_BIG_ENDIAN);
        } else if(strncmp(buffer,"DMUP",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Mouse Button Released (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_dmup,tvb,offset+8,1,ENC_BIG_ENDIAN);
        } else if(strncmp(buffer,"DMMV",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Mouse Moved (%s)",buffer);
            dissect_synergy_dmmv(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"DMRM",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Relative Mouse Move (%s)",buffer);
            dissect_synergy_dmrm(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"DMWM",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Mouse Button Pressed (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_dmwm,tvb,offset+8,2,ENC_BIG_ENDIAN);
        } else if(strncmp(buffer,"DCLP",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Clipboard Data (%s)",buffer);
            dissect_synergy_dclp(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"DINF",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Client Data (%s)",buffer);
            dissect_synergy_dinf(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"DSOP",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Set Options (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_dsop,tvb,offset+8,4,ENC_BIG_ENDIAN);
        } else if(strncmp(buffer,"QINF",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Query Screen Info (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_qinf,tvb,offset+8,-1,ENC_NA);
        } else if(strncmp(buffer,"EICV",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Incompatible Veersions (%s)",buffer);
            dissect_synergy_eicv(tvb,pinfo,synergy_tree,offset+8);
        } else if(strncmp(buffer,"EBSY",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Connection Already in Use (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_ebsy,tvb,offset+8,-1,ENC_NA);
        } else if(strncmp(buffer,"EUNK",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Unknown Client (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_eunk,tvb,offset+8,-1,ENC_NA);
        } else if(strncmp(buffer,"EBAD",4)==0) {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Protocol Violation (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_ebad,tvb,offset+8,-1,ENC_NA);
        } else {
            proto_tree_add_string_format_value(synergy_tree,hf_synergy_packet_type,tvb,offset+4,4,buffer,"Unknown (%s)",buffer);
            proto_tree_add_item(synergy_tree,hf_synergy_unknown,tvb,offset+8,-1,ENC_NA);
        }
    }

    return tvb_captured_length(tvb);
}

static void dissect_synergy_handshake( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_handshake, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_handshake_majorversion, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_handshake_minorversion, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

    if (tvb_reported_length_remaining(tvb, offset + 4) != 0)
    {
        proto_tree_add_item(sub_tree, hf_synergy_unknown, tvb, offset + 4, 4, ENC_NA);
        proto_tree_add_item(sub_tree, hf_synergy_handshake_clientname, tvb, offset + 8, -1, ENC_ASCII|ENC_NA);
    }
}

static void dissect_synergy_cinn( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_cinn, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_cinn_x, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_cinn_y, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_cinn_sequence, tvb, offset + 4, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_cinn_modifiermask, tvb, offset + 8, 2, ENC_BIG_ENDIAN);
}

static void dissect_synergy_cclp( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_cclp, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_cclp_clipboardidentifier, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_cclp_sequencenumber, tvb, offset + 1, 4, ENC_BIG_ENDIAN);
}

static void dissect_synergy_dkdn( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_dkdn, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_dkdn_keyid, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dkdn_keymodifiermask, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

    if (tvb_reported_length_remaining(tvb, offset + 4) != 0)
        proto_tree_add_item(sub_tree, hf_synergy_dkdn_keybutton, tvb, offset + 4, 2, ENC_BIG_ENDIAN);
}

static void dissect_synergy_dkrp( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_dkrp, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_dkrp_keyid, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dkrp_keymodifiermask, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dkrp_numberofrepeats, tvb, offset + 4, 2, ENC_BIG_ENDIAN);

    if (tvb_reported_length_remaining(tvb, offset + 6) != 0)
        proto_tree_add_item(sub_tree, hf_synergy_dkrp_keybutton, tvb, offset + 6, 2, ENC_BIG_ENDIAN);
}

static void dissect_synergy_dkup( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_dkup, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_dkup_keyid, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dkup_keymodifiermask, tvb, offset + 2, 2, ENC_BIG_ENDIAN);

    if (tvb_reported_length_remaining(tvb, offset + 4) != 0)
        proto_tree_add_item(sub_tree, hf_synergy_dkup_keybutton, tvb, offset + 4, 2, ENC_BIG_ENDIAN);
}

static void dissect_synergy_dmmv( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_dmmv, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_dmmv_x, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dmmv_y, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
}

static void dissect_synergy_dmrm( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_dmrm, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_dmrm_x, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dmrm_y, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
}

static void dissect_synergy_dclp( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_dclp, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_dclp_clipboardidentifier, tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dclp_sequencenumber, tvb, offset + 1, 4, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dclp_clipboarddata, tvb, offset + 5, -1, ENC_ASCII|ENC_NA);
}

static void dissect_synergy_dinf( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_dinf, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_dinf_clp, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dinf_ctp, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dinf_wsp, tvb, offset + 4, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dinf_hsp, tvb, offset + 6, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dinf_swz, tvb, offset + 8, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dinf_x, tvb, offset + 10, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_dinf_y, tvb, offset + 12, 2, ENC_BIG_ENDIAN);
}

static void dissect_synergy_eicv( tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, gint offset )
{
    proto_item *ti = NULL;
    proto_tree *sub_tree = NULL;
    ti = proto_tree_add_item(tree, hf_synergy_eicv, tvb, offset, -1, ENC_NA);
    sub_tree = proto_item_add_subtree(ti, ett_synergy);

    proto_tree_add_item(sub_tree, hf_synergy_eicv_majorversion, tvb, offset, 2, ENC_BIG_ENDIAN);
    proto_tree_add_item(sub_tree, hf_synergy_eicv_minorversion, tvb, offset + 2, 2, ENC_BIG_ENDIAN);
}

static guint
synergy_get_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
{
	return tvb_get_ntohl(tvb, offset) + 4;
}

static int
dissect_synergy(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    tcp_dissect_pdus(tvb, pinfo, tree, TRUE, 4, synergy_get_pdu_len,
                     dissect_synergy_pdu, NULL);
    return tvb_captured_length(tvb);
}

void
proto_register_synergy(void)
{
    static hf_register_info hf[] = {

        { &hf_synergy_packet_len,
            { "Packet Length","synergy.packet_len",FT_UINT32, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_packet_type,
            { "Packet Type","synergy.packet_type",FT_STRING, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_unknown,
            { "unknown","synergy.unknown",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_handshake,
            { "Handshake","synergy.handshake",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_handshake_majorversion,
            { "Major Version","synergy.handshake.majorversion",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_handshake_minorversion,
            { "Minor Version","synergy.handshake.minorversion",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_handshake_clientname,
            { "Client Name","synergy.handshake.client",FT_STRING, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cbye,
            { "Close Connection","synergy.cbye",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cinn,
            { "Enter Screen","synergy.cinn",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cinn_x,
            { "Screen X","synergy.cinn.x",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cinn_y,
            { "Screen Y","synergy.cinn.y",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cinn_sequence,
            { "Sequence Number","synergy.cinn.sequence",FT_UINT32, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cinn_modifiermask,
            { "Modifier Key Mask","synergy.cinn.mask",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cout,
            { "Leave Screen","synergy.cout",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cclp,
            { "Grab Clipboard","synergy.clipboard",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cclp_clipboardidentifier,
            { "Identifier","synergy.clipboard.identifier",FT_UINT8, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_cclp_sequencenumber,
            { "Sequence Number","synergy.clipboard.sequence",FT_UINT32, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_csec,
            { "Screen Saver Change","synergy.screensaver",FT_BOOLEAN, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_crop,
            { "Reset Options","synergy.resetoptions",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_ciak,
            { "Resolution Change Acknowledgment","synergy.ack",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkdn,
            { "Key Pressed","synergy.keypressed",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkdn_keyid,
            { "Key Id","synergy.keypressed.keyid",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkdn_keymodifiermask,
            { "Key Modifier Mask","synergy.keypressed.mask",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkdn_keybutton,
            { "Key Button","synergy.keypressed.key",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkrp,
            { "Key Auto-Repeat","synergy.keyautorepeat",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkrp_keyid,
            { "Key ID","synergy.keyautorepeat.keyid",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkrp_keymodifiermask,
            { "Key modifier Mask","synergy.keyautorepeat.mask",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkrp_numberofrepeats,
            { "Number of Repeats","synergy.keyautorepeat.repeat",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkrp_keybutton,
            { "Key Button","synergy.keyautorepeat.key",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkup,
            { "Key Released","synergy.keyreleased",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkup_keyid,
            { "Key Id","synergy.keyreleased.keyid",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkup_keymodifiermask,
            { "Key Modifier Mask","synergy.keyreleased.mask",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dkup_keybutton,
            { "Key Button","synergy.keyreleased.key",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmdn,
            { "Mouse Button Pressed","synergy.mousebuttonpressed",FT_UINT8, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmup,
            { "Mouse Button Released","synergy.mousebuttonreleased",FT_UINT8, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmmv,
            { "Mouse Moved","synergy.mousemoved",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmmv_x,
            { "X Axis","synergy.mousemoved.x",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmmv_y,
            { "Y Axis","synergy.mousemoved.y",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmrm,
            { "Relative Mouse Move","synergy.relativemousemove",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmrm_x,
            { "X Axis","synergy.relativemousemove.x",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmrm_y,
            { "Y Axis","synergy.relativemousemove.y",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dmwm,
            { "Mouse Button Pressed","synergy.mousebuttonpressed",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dclp,
            { "Clipboard Data","synergy.clipboarddata",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dclp_clipboardidentifier,
            { "Clipboard Identifier","synergy.clipboarddata.identifier",FT_UINT8, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dclp_sequencenumber,
            { "Sequence Number","synergy.clipboarddata.sequence",FT_UINT32, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dclp_clipboarddata,
            { "Clipboard Data","synergy.clipboarddata.data",FT_STRING, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dinf,
            { "Client Data","synergy.clientdata",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dinf_clp,
            { "coordinate of leftmost pixel on secondary screen","synergy.clps",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dinf_ctp,
            { "coordinate of topmost pixel on secondary screen","synergy.clps.ctp",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dinf_wsp,
            { "width of secondary screen in pixels","synergy.clps.wsp",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dinf_hsp,
            { "height of secondary screen in pixels","synergy.clps.hsp",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dinf_swz,
            { "size of warp zone","synergy.clps.swz",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dinf_x,
            { "x position of the mouse on the secondary screen","synergy.clps.x",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dinf_y,
            { "y position of the mouse on the secondary screen","synergy.clps.y",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_dsop,
            { "Set Options","synergy.setoptions",FT_UINT32, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_qinf,
            { "Query Screen Info","synergy.qinf",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_eicv,
            { "Incompatible Versions","synergy.eicv",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_eicv_majorversion,
            { "Major Version Number","synergy.eicv.major",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_eicv_minorversion,
            { "Minor Version Number","synergy.eicv.minor",FT_UINT16, BASE_DEC, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_ebsy,
            { "Connection Already in Use","synergy.ebsy",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_eunk,
            { "Unknown Client","synergy.unknown",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
        { &hf_synergy_ebad,
            { "Protocol Violation","synergy.violation",FT_NONE, BASE_NONE, NULL, 0x0,NULL, HFILL }
        },
    };


/* Setup protocol subtree array */
    static gint *ett[] = {
        &ett_synergy,
    };

/* Register the protocol name and description */
    proto_synergy = proto_register_protocol("Synergy", "Synergy", "synergy");

/* Required function calls to register the header fields and subtrees used */
    proto_register_field_array(proto_synergy, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));
    synergy_handle = register_dissector("synergy", dissect_synergy, proto_synergy);
}

void
proto_reg_handoff_synergy(void)
{
    dissector_add_uint_with_preference("tcp.port", SYNERGY_PORT, synergy_handle);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: nil
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 expandtab:
 * :indentSize=4:tabSize=8:noTabs=true:
 */
