/* packet-ipsi-ctl.c
 * Routines for Avaya IPSI Control packet disassembly
 * Traffic is encapsulated Avaya proprietary CCMS
 * (Control Channel Message Set) between PCD and SIM
 *
 * Copyright 2008, Randy McEoin <rmceoin@ahbelo.com>
 *
 * $Id$
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "config.h"

#include <glib.h>
#include <epan/packet.h>

#define IPSICTL_PORT		5010
#define IPSICTL_PDU_MAGIC	0x0300

static int proto_ipsictl = -1;

static int hf_ipsictl_pdu = -1;
static int hf_ipsictl_magic = -1;
static int hf_ipsictl_length = -1;
static int hf_ipsictl_type = -1;
static int hf_ipsictl_sequence = -1;
static int hf_ipsictl_field1 = -1;
static int hf_ipsictl_data = -1;

static gint ett_ipsictl = -1;
static gint ett_ipsictl_pdu = -1;

static void dissect_ipsictl(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{

  proto_tree   *ipsictl_tree = NULL;
  proto_tree   *pdu_tree = NULL;
  proto_item   *ti;
  int           offset = 0;
  int           loffset = 0;
  int           llength = 0;
  int		remaining_length;
  guint16       magic;
  guint16       length;
  guint16       type=0;
  guint16       sequence=0;
  int		first_sequence=-1;
  int		last_sequence=-1;
  guint16       field1=0;
  guint16       pdu=0;
  int		haspdus=0;

  remaining_length=tvb_reported_length_remaining(tvb, offset);

  if (tree) {

      ti = proto_tree_add_item(tree, proto_ipsictl, tvb, offset, remaining_length, ENC_NA);
      ipsictl_tree = proto_item_add_subtree(ti, ett_ipsictl);

  }

  magic = tvb_get_ntohs(tvb, offset);
  if (magic == IPSICTL_PDU_MAGIC)
  {
    haspdus=1;
  }

  while (haspdus &&
    ((remaining_length=tvb_reported_length_remaining(tvb, offset)) > 6))
  {
    loffset = offset;

    magic = tvb_get_ntohs(tvb, loffset); loffset+=2;
    length = tvb_get_ntohs(tvb, loffset); loffset+=2;
    llength=length;
    remaining_length-=4;
    if (remaining_length>=2)
    {
      type = tvb_get_ntohs(tvb, loffset); loffset+=2;
      remaining_length-=2;
      llength-=2;
    }
    if (remaining_length>=2)
    {
      sequence = tvb_get_ntohs(tvb, loffset); loffset+=2;
      remaining_length-=2;
      llength-=2;
      if (first_sequence==-1)
      {
        first_sequence=sequence;
      }else{
        last_sequence=sequence;
      }
    }
    if (remaining_length>=2)
    {
      field1 = tvb_get_ntohs(tvb, loffset);
      llength-=2;
    }

    if (tree) {

      ti = proto_tree_add_uint(ipsictl_tree, hf_ipsictl_pdu, tvb,
           offset, (length+4), pdu);

      pdu_tree = proto_item_add_subtree(ti, ett_ipsictl_pdu);
    }

    loffset=offset;
    remaining_length=tvb_reported_length_remaining(tvb, offset);

    if (tree) {
      proto_tree_add_uint(pdu_tree, hf_ipsictl_magic, tvb, loffset, 2, magic);
    }
    loffset+=2; remaining_length-=2;
    if (tree) {
      proto_tree_add_uint(pdu_tree, hf_ipsictl_length, tvb, loffset, 2, length);
    }
    loffset+=2; remaining_length-=2;

    if (remaining_length>=2)
    {
      if (tree) {
        proto_tree_add_uint(pdu_tree, hf_ipsictl_type, tvb, loffset, 2, type);
      }
      loffset+=2; remaining_length-=2;
    }
    if (remaining_length>=2)
    {
      if (tree) {
        proto_tree_add_uint(pdu_tree, hf_ipsictl_sequence, tvb, loffset, 2, sequence);
      }
      loffset+=2; remaining_length-=2;
    }
    if (remaining_length>=2)
    {
      if (tree) {
        proto_tree_add_uint(pdu_tree, hf_ipsictl_field1, tvb, loffset, 2, field1);
      }
      loffset+=2; remaining_length-=2;
    }
    if (remaining_length>=2)
    {
      if (tree) {
        proto_tree_add_item(pdu_tree, hf_ipsictl_data, tvb, loffset, llength, ENC_NA);
      }
      loffset+=llength;
    }

    offset=loffset;
    pdu++;
  }

  if (!haspdus)
  {
    if (tree) {
      proto_tree_add_item(ipsictl_tree, hf_ipsictl_data, tvb, offset, -1, ENC_NA);
    }
  }

  col_set_str(pinfo->cinfo, COL_PROTOCOL, "IPSICTL");

  if (haspdus)
  {
    if (last_sequence==-1)
    {
      col_add_fstr(pinfo->cinfo, COL_INFO, "PDUS=%d, Seq=0x%04x",
        pdu,first_sequence);
    }else{
      col_add_fstr(pinfo->cinfo, COL_INFO, "PDUS=%d, Seq=0x%04x-0x%04x",
        pdu,first_sequence,last_sequence);
    }
  }else{
    col_set_str(pinfo->cinfo, COL_INFO, "Initialization");
  }


} /* dissect_ipsictl */

void proto_register_ipsictl(void)
{

  static hf_register_info hf[] = {
    { &hf_ipsictl_pdu,
      { "PDU",	"ipsictl.pdu",
	FT_UINT16,	BASE_DEC,	NULL,	0x0,
      	"IPSICTL PDU", HFILL }},
    { &hf_ipsictl_magic,
      { "Magic",	"ipsictl.magic",
	FT_UINT16,	BASE_HEX,	NULL,	0x0,
      	"IPSICTL Magic", HFILL }},
    { &hf_ipsictl_length,
      { "Length",	"ipsictl.length",
	FT_UINT16,	BASE_HEX,	NULL,	0x0,
      	"IPSICTL Length", HFILL }},
    { &hf_ipsictl_type,
      { "Type",	"ipsictl.type",
	FT_UINT16,	BASE_HEX,	NULL,	0x0,
      	"IPSICTL Type", HFILL }},
    { &hf_ipsictl_sequence,
      { "Sequence",	"ipsictl.sequence",
	FT_UINT16,	BASE_HEX,	NULL,	0x0,
      	"IPSICTL Sequence", HFILL }},
    { &hf_ipsictl_field1,
      { "Field1",	"ipsictl.field1",
	FT_UINT16,	BASE_HEX,	NULL,	0x0,
      	"IPSICTL Field1", HFILL }},
    { &hf_ipsictl_data,
      { "Data",	"ipsictl.data",
	FT_BYTES,	BASE_NONE,	NULL,	0x0,
      	"IPSICTL data", HFILL }},
  };

  static gint *ett[] = {
    &ett_ipsictl,
    &ett_ipsictl_pdu
  };

  proto_ipsictl = proto_register_protocol("IPSICTL", "IPSICTL", "ipsictl");
  proto_register_field_array(proto_ipsictl, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));

}

void proto_reg_handoff_ipsictl(void)
{

  dissector_handle_t ipsictl_handle = NULL;

  ipsictl_handle = create_dissector_handle(dissect_ipsictl, proto_ipsictl);

  dissector_add_uint("tcp.port", IPSICTL_PORT, ipsictl_handle);

}

