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path: root/epan/dissectors/packet-kink.c
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/* packet-kink.c
 * Routines for KINK packet disassembly
 * It is referrenced draft-ietf-kink-kink-jp-04.txt,v 1.14 2003/02/10
 *
 * Copyright 2004, Takeshi Nakashima <T.Nakashima@jp.yokogawa.com>
 *
 * 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 <epan/packet.h>
#include <epan/expert.h>
#include <epan/asn1.h>
#include "packet-kerberos.h"
#include "packet-isakmp.h"

void proto_register_kink(void);
void proto_reg_handoff_kink(void);

#define KINK_PORT       57203

#define KINK_ISAKMP_PAYLOAD_BASE 14

static int proto_kink = -1;

/* Argument for proto_tree_add_uint() */
static int hf_kink_type = -1;
static int hf_kink_length = -1;
static int hf_kink_transactionId = -1;
static int hf_kink_checkSumLength = -1;
static int hf_kink_A = -1;
static int hf_kink_version = -1;
static int hf_kink_domain_of_interpretation = -1;
static int hf_kink_qmversion = -1;
static int hf_kink_error_code = -1;
static int hf_kink_reserved8 = -1;
static int hf_kink_reserved15 = -1;
static int hf_kink_reserved16 = -1;
static int hf_kink_reserved24 = -1;
static int hf_kink_checkSum = -1;
static int hf_kink_next_payload = -1;
static int hf_kink_payload_length = -1;
static int hf_kink_epoch = -1;
static int hf_kink_inner_next_pload = -1;
static int hf_kink_realm_name_length = -1;
static int hf_kink_realm_name = -1;
static int hf_kink_princ_name_length = -1;
static int hf_kink_princ_name = -1;
static int hf_kink_tgt_length = -1;
static int hf_kink_tgt = -1;
static int hf_kink_payload = -1;

/* Argument for making the subtree */
static gint ett_kink = -1;
/*static gint ett_kink_version = -1;*/
static gint ett_kink_payload = -1;
static gint ett_payload_kink_ap_req = -1;
static gint ett_payload_kink_ap_rep = -1;
static gint ett_payload_kink_krb_error = -1;
static gint ett_payload_kink_tgt_req = -1;
static gint ett_payload_kink_tgt_rep = -1;
static gint ett_payload_kink_isakmp = -1;
static gint ett_payload_kink_encrypt = -1;
static gint ett_payload_kink_error = -1;
static gint ett_payload_not_defined = -1;
static gint ett_decrypt_kink_encrypt = -1;

static expert_field ei_kink_payload_length_small = EI_INIT;
static expert_field ei_kink_payload_length_mismatch = EI_INIT;


/* Define the kink type value */
#define KINK_TYPE_RESERVED 0
#define KINK_TYPE_CREATE   1
#define KINK_TYPE_DELETE   2
#define KINK_TYPE_REPLY    3
#define KINK_TYPE_GETTGT   4
#define KINK_TYPE_ACK      5
#define KINK_TYPE_STATUS   6

static const value_string kink_type_vals[]={
  {KINK_TYPE_RESERVED,"RESERVED"},
  {KINK_TYPE_CREATE,"CREATE"},
  {KINK_TYPE_DELETE,"DELETE"},
  {KINK_TYPE_REPLY,"REPLY"},
  {KINK_TYPE_GETTGT,"GETTGT"},
  {KINK_TYPE_ACK,"ACK"},
  {KINK_TYPE_STATUS,"STATUS"},
  {0, NULL},
};

/* Define the kink A value */
#define KINK_A_NOT_REQUEST_ACK  0
#define KINK_A_REQUEST_ACK      1

static const value_string kink_A_vals[]={
  {KINK_A_NOT_REQUEST_ACK,"Not Request ACK"},
  {KINK_A_REQUEST_ACK,"Request ACK"},
  {0, NULL},
};

/* Define the kink payload */
#define KINK_DONE                                0
#define KINK_AP_REQ     KINK_ISAKMP_PAYLOAD_BASE+0
#define KINK_AP_REP     KINK_ISAKMP_PAYLOAD_BASE+1
#define KINK_KRB_ERROR  KINK_ISAKMP_PAYLOAD_BASE+2
#define KINK_TGT_REQ    KINK_ISAKMP_PAYLOAD_BASE+3
#define KINK_TGT_REP    KINK_ISAKMP_PAYLOAD_BASE+4
#define KINK_ISAKMP     KINK_ISAKMP_PAYLOAD_BASE+5
#define KINK_ENCRYPT    KINK_ISAKMP_PAYLOAD_BASE+6
#define KINK_ERROR      KINK_ISAKMP_PAYLOAD_BASE+7

static const value_string kink_next_payload[]={
  {KINK_DONE, "KINK_DONE"},
  {KINK_AP_REQ, "KINK_AP_REQ"},
  {KINK_AP_REP, "KINK_AP_REP"},
  {KINK_KRB_ERROR, "KINK_KRB_ERROR"},
  {KINK_TGT_REQ, "KINK_TGT_REQ"},
  {KINK_TGT_REP, "KINK_TGT_REP"},
  {KINK_ISAKMP, "KINK_ISAKMP"},
  {KINK_ENCRYPT, "KINK_ENCRYPT"},
  {KINK_ERROR, "KINK_ERROR"},
  {0, NULL},
};

/* Define the magic number
 * Using at the kink error
 */
#define KINK_OK                   0
#define KINK_PROTOERR             1
#define KINK_INVDOI               2
#define KINK_INVMAJ               3
#define KINK_INVMIN               4
#define KINK_INTERR               5
#define KINK_BADQMVERS            6
#define BOTTOM_RESERVED           7
#define TOP_RESERVED           8191
#define BOTTOM_PRIVATE_USE     8192
#define TOP_PRIVATE_USE       16383

/* Using at the kink header */
#define IPSEC                     1
#define VERSION_BIT_SHIFT         4
#define A_BIT_SHIFT               7
#define FROM_TYPE_TO_RESERVED    16

/* Using at the payload */
#define TO_PAYLOAD_LENGTH         2
#define PADDING                   4
#define KINK_KRB_ERROR_HEADER     4
#define FROM_NP_TO_PL             4
#define TO_REALM_NAME_LENGTH      4
#define KINK_TGT_REQ_HEADER       6
#define FRONT_TGT_REP_HEADER      6
#define PAYLOAD_HEADER            8
#define KINK_ERROR_LENGTH         8


/* define hexadecimal */
#define FRONT_FOUR_BIT         0xf0
#define SECOND_FOUR_BIT        0x0f
#define FRONT_ONE_BIT          0x80
#define SECOND_FIFTEEN_BIT   0x7fff

/* decrypt element */
static guint32 keytype;

static void control_payload(packet_info *pinfo, tvbuff_t *tvb, int offset, guint8 next_payload, proto_tree *kink_payload_tree);
static void dissect_payload_kink_ap_req(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static void dissect_payload_kink_ap_rep(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static void dissect_payload_kink_krb_error(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static void dissect_payload_kink_tgt_req(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static void dissect_payload_kink_tgt_rep(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static void dissect_payload_kink_isakmp(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static void dissect_payload_kink_encrypt(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static void dissect_payload_kink_error(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static void dissect_payload_kink_not_defined(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
#ifdef HAVE_KERBEROS
static void dissect_decrypt_kink_encrypt(packet_info *pinfo, tvbuff_t *tvb, proto_tree *tree, int payload_length);
#endif

/* This function is dissecting the kink header. */
static int
dissect_kink(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_){
  proto_item *ti = NULL;
  proto_tree *kink_tree = NULL;
  guint8 type;
  guint32 doi;
  guint chsumlen;
  guint8 next_payload;
  guint8 value_a_and_front_reserved;
  guint8 value_a;
  int offset=0;

  type = tvb_get_guint8(tvb,offset);

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

  /* It shows kink type by the type value. */
  col_set_str(pinfo->cinfo, COL_INFO,  val_to_str_const(type, kink_type_vals, "unknown"));

  /* Make the kink tree */
  ti = proto_tree_add_item(tree, proto_kink, tvb, offset, -1, ENC_NA);
  kink_tree = proto_item_add_subtree(ti, ett_kink);

  proto_tree_add_uint(kink_tree, hf_kink_type, tvb, offset, 1, type);
  offset++;

  proto_tree_add_item(kink_tree, hf_kink_version, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset++;

  proto_tree_add_item(kink_tree, hf_kink_length, tvb, offset, 2, ENC_BIG_ENDIAN);
  offset += 2;

  doi = tvb_get_ntohl(tvb, offset);

  if(doi == IPSEC){
    proto_tree_add_uint_format_value(kink_tree, hf_kink_domain_of_interpretation, tvb, offset, 4, doi, "IPsec (%u)", doi);
  }
  else{
    proto_tree_add_uint_format_value(kink_tree, hf_kink_domain_of_interpretation, tvb, offset, 4, doi, "Not IPsec (%u)", doi);
  }
  offset += 4;

  proto_tree_add_item(kink_tree, hf_kink_transactionId, tvb, offset, 4,  ENC_BIG_ENDIAN);
  offset += 4;

  chsumlen = tvb_get_guint8(tvb, offset);
  proto_tree_add_item(kink_tree, hf_kink_checkSumLength, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(kink_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  /* A is 1bit field. The caluculation of A is shown below.
   * The logical product of 1octet value and 0x80 is performed.
   * And It is performed 7bit right shift.
   */
  value_a_and_front_reserved = tvb_get_guint8(tvb, offset);
  value_a = (value_a_and_front_reserved & FRONT_ONE_BIT) >> A_BIT_SHIFT;
  proto_tree_add_uint(kink_tree, hf_kink_A, tvb, offset, 1, value_a);

  /* The reserved field is 15bit.
   * The logical product of 2octet value and 0x7fff is performed.
   */
  proto_tree_add_item(kink_tree, hf_kink_reserved15, tvb, offset, 2, ENC_BIG_ENDIAN);
  offset += 2;

  proto_tree_add_item(kink_tree, hf_kink_checkSum, tvb, offset, chsumlen, ENC_NA);

  /* This part consider the padding. Chsumlen don't contain the padding. */
  if((chsumlen % PADDING) != 0){
    chsumlen += (PADDING - (chsumlen % PADDING));
    offset += chsumlen;
  }
  else{
    offset += chsumlen;
  }

  control_payload(pinfo, tvb, offset, next_payload, kink_tree);

  return tvb_captured_length(tvb);
}

/* This part call the dissect payload function by next_payload value.
 * This function called by the respective function again.
 */
static void
control_payload(packet_info *pinfo, tvbuff_t *tvb, int offset, guint8 next_payload, proto_tree *kink_tree){
  switch(next_payload){
  case KINK_DONE:
    break;
  case KINK_AP_REQ:
    dissect_payload_kink_ap_req(pinfo, tvb, offset, kink_tree);
    break;
  case KINK_AP_REP:
    dissect_payload_kink_ap_rep(pinfo, tvb, offset, kink_tree);
    break;
  case KINK_KRB_ERROR:
    dissect_payload_kink_krb_error(pinfo, tvb, offset, kink_tree);
    break;
  case KINK_TGT_REQ:
    dissect_payload_kink_tgt_req(pinfo, tvb, offset, kink_tree);
    break;
  case KINK_TGT_REP:
    dissect_payload_kink_tgt_rep(pinfo, tvb, offset, kink_tree);
    break;
  case KINK_ISAKMP:
    dissect_payload_kink_isakmp(pinfo, tvb, offset, kink_tree);
    break;
  case KINK_ENCRYPT:
    dissect_payload_kink_encrypt(pinfo, tvb, offset, kink_tree);
    break;
  case KINK_ERROR:
    dissect_payload_kink_error(pinfo, tvb, offset, kink_tree);
    break;
  default:
    dissect_payload_kink_not_defined(pinfo, tvb, offset, kink_tree);
    break;
  }
}

static void
dissect_payload_kink_ap_req(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_ap_req_tree;
  proto_item *ti;
  guint8 next_payload;
  guint payload_length;
  guint16 krb_ap_req_length;
  int start_payload_offset = 0;  /* Keep beginning of payload offset */

  start_payload_offset = offset;
  payload_length = tvb_get_ntohs(tvb, offset + TO_PAYLOAD_LENGTH);

  /* Make the subtree. */
  payload_kink_ap_req_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                        ett_payload_kink_ap_req, NULL, "KINK_AP_REQ");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_ap_req_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_ap_req_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  ti = proto_tree_add_uint(payload_kink_ap_req_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);
  if(payload_length <= PAYLOAD_HEADER){
    expert_add_info(pinfo, ti, &ei_kink_payload_length_small);
  }
  offset += 2;

  /* Show time as UTC, not local time. */
  proto_tree_add_item(payload_kink_ap_req_tree, hf_kink_epoch, tvb, offset, 4, ENC_BIG_ENDIAN);
  offset += 4;

  if(payload_length > PAYLOAD_HEADER){
    tvbuff_t *krb_tvb;

    krb_ap_req_length = payload_length - PAYLOAD_HEADER;
    krb_tvb=tvb_new_subset(tvb, offset, (krb_ap_req_length>tvb_captured_length_remaining(tvb, offset))?tvb_captured_length_remaining(tvb, offset):krb_ap_req_length, krb_ap_req_length);
    keytype=kerberos_output_keytype();
    dissect_kerberos_main(krb_tvb, pinfo, payload_kink_ap_req_tree, FALSE, NULL);
    /*offset += krb_ap_req_length;*/
  }

  /* This part consider padding the padding. Payload_length don't contain the padding. */
  if(payload_length % PADDING != 0){
    payload_length += (PADDING - (payload_length % PADDING));
  }
  offset = start_payload_offset + payload_length;

  if(payload_length > 0) {
    control_payload(pinfo, tvb, offset, next_payload, tree); /* Recur control_payload() */
  }
}


static void
dissect_payload_kink_ap_rep(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_ap_rep_tree;
  proto_item *ti;
  guint8 next_payload;
  guint payload_length;
  guint16 krb_ap_rep_length;
  int start_payload_offset = 0; /* Keep beginning of payload offset */

  payload_length = tvb_get_ntohs(tvb, offset + TO_PAYLOAD_LENGTH);
  start_payload_offset = offset;

  /* Make the subtree */
  payload_kink_ap_rep_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                        ett_payload_kink_ap_rep, NULL, "KINK_AP_REP");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_ap_rep_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_ap_rep_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  ti = proto_tree_add_uint(payload_kink_ap_rep_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);
  if(payload_length <= PAYLOAD_HEADER){
    expert_add_info(pinfo, ti, &ei_kink_payload_length_small);
  }
  offset += 2;

  /* Show time as UTC, not local time. */
  proto_tree_add_item(payload_kink_ap_rep_tree, hf_kink_epoch, tvb, offset, 4, ENC_BIG_ENDIAN);
  offset += 4;

  if(payload_length > PAYLOAD_HEADER){
    tvbuff_t *krb_tvb;

    krb_ap_rep_length = payload_length - PAYLOAD_HEADER;
    krb_tvb=tvb_new_subset(tvb, offset, (krb_ap_rep_length>tvb_captured_length_remaining(tvb, offset))?tvb_captured_length_remaining(tvb, offset):krb_ap_rep_length, krb_ap_rep_length);
    keytype=kerberos_output_keytype();
    dissect_kerberos_main(krb_tvb, pinfo, payload_kink_ap_rep_tree, FALSE, NULL);

    /*offset += krb_ap_rep_length;*/
  }

  /* This part consider the padding. Payload_length don't contain the padding. */
  if(payload_length % PADDING != 0){
    payload_length += (PADDING - (payload_length % PADDING));
  }
  offset = start_payload_offset + payload_length;

  if(payload_length > 0) {
    control_payload(pinfo, tvb, offset, next_payload, tree); /* Recur control_payload() */
  }
}

static void
dissect_payload_kink_krb_error(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_krb_error_tree;
  proto_item *ti;
  guint8 next_payload;
  guint payload_length;
  guint16 krb_error_length;
  int start_payload_offset = 0; /* Keep the beginning of the payload offset  */

  payload_length = tvb_get_ntohs(tvb, offset + TO_PAYLOAD_LENGTH);
  start_payload_offset = offset;

  /* Make the subtree */
  payload_kink_krb_error_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                                    ett_payload_kink_krb_error, NULL, "KINK_KRB_ERROR");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_krb_error_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_krb_error_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  ti = proto_tree_add_uint(payload_kink_krb_error_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);
  if(payload_length <= KINK_KRB_ERROR_HEADER){
    expert_add_info(pinfo, ti, &ei_kink_payload_length_small);
  }
  else {
    offset += 2;
  }

  if(payload_length > KINK_KRB_ERROR_HEADER){
    tvbuff_t *krb_tvb;

    krb_error_length = payload_length - KINK_KRB_ERROR_HEADER;
    krb_tvb=tvb_new_subset(tvb, offset, (krb_error_length>tvb_captured_length_remaining(tvb, offset))?tvb_captured_length_remaining(tvb, offset):krb_error_length, krb_error_length);

    dissect_kerberos_main(krb_tvb, pinfo, payload_kink_krb_error_tree, FALSE, NULL);
    /*offset += krb_error_length;*/
  }

  /* This part consider the padding. Payload_length don't contain the padding. */
  if(payload_length % PADDING != 0){
    payload_length += (PADDING - (payload_length % PADDING));
  }
  offset = start_payload_offset + payload_length;

  if(payload_length > 0) {
    control_payload(pinfo, tvb, offset, next_payload, tree); /* Recur control_payload() */
  }
}

static void
dissect_payload_kink_tgt_req(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_tgt_req_tree;
  guint8 next_payload;
  guint payload_length;
  guint16 realm_name_length;
  int start_payload_offset = 0; /* Keep the beginning of the payload offset  */

  payload_length = tvb_get_ntohs(tvb, offset + TO_PAYLOAD_LENGTH);
  realm_name_length = tvb_get_ntohs(tvb, offset + TO_REALM_NAME_LENGTH);
  start_payload_offset = offset;

  /* Make the subtree */
  payload_kink_tgt_req_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                                        ett_payload_kink_tgt_req, NULL, "KINK_TGT_REQ");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_tgt_req_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_tgt_req_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  proto_tree_add_uint(payload_kink_tgt_req_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);
  offset += 2;

  proto_tree_add_uint(payload_kink_tgt_req_tree, hf_kink_realm_name_length, tvb, offset, 2, realm_name_length);
  offset += 2;

  proto_tree_add_item(payload_kink_tgt_req_tree, hf_kink_realm_name, tvb, offset, realm_name_length, ENC_NA|ENC_ASCII);

  /* This part consider the padding. Payload_length don't contain the padding. */
  if(payload_length % PADDING != 0){
    payload_length += (PADDING - (payload_length % PADDING));
  }
  offset = start_payload_offset + payload_length;

  if(payload_length > 0) {
    control_payload(pinfo, tvb, offset, next_payload, tree); /* Recur control_payload() */
  }
}

static void
dissect_payload_kink_tgt_rep(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_tgt_rep_tree;
  guint8 next_payload;
  guint payload_length;
  guint princ_name_length;
  guint16 tgt_length;
  int start_payload_offset = 0; /* Keep the beginning of the payload offset  */

  payload_length = tvb_get_ntohs(tvb, offset + TO_PAYLOAD_LENGTH);
  start_payload_offset = offset;

  /* Make the subtree */
  payload_kink_tgt_rep_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                                ett_payload_kink_tgt_rep, NULL, "KINK_TGT_REP");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_tgt_rep_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_tgt_rep_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  proto_tree_add_uint(payload_kink_tgt_rep_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);
  offset += 2;

  princ_name_length = tvb_get_ntohs(tvb, offset);
  proto_tree_add_uint(payload_kink_tgt_rep_tree, hf_kink_princ_name_length, tvb, offset, 2, princ_name_length);
  offset += 2;

  proto_tree_add_item(payload_kink_tgt_rep_tree, hf_kink_princ_name, tvb, offset, princ_name_length, ENC_NA|ENC_ASCII);

  /* This part consider the padding. Princ_name_length don't contain the padding. */
  if((princ_name_length + FRONT_TGT_REP_HEADER) % PADDING != 0){
    offset += (princ_name_length + PADDING - ((princ_name_length + FRONT_TGT_REP_HEADER) %  PADDING));
  }
  else{
    offset += princ_name_length;
  }

  tgt_length = tvb_get_ntohs(tvb, offset);
  proto_tree_add_uint(payload_kink_tgt_rep_tree, hf_kink_tgt_length, tvb, offset, 2, tgt_length);
  offset += 2;

  proto_tree_add_item(payload_kink_tgt_rep_tree, hf_kink_tgt, tvb, offset, tgt_length, ENC_NA|ENC_ASCII);
  /*offset += tgt_length;*/

  /* This part consider the padding. Payload_length don't contain the padding. */
  if(payload_length % PADDING!=0){
    payload_length += (PADDING - (payload_length % PADDING));
  }
  offset = start_payload_offset + payload_length;

  if(payload_length > 0) {
    control_payload(pinfo, tvb, offset, next_payload, tree); /* Recur control_payload() */
  }
}

static void
dissect_payload_kink_isakmp(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_isakmp_tree;
  proto_item *ti;
  guint8 next_payload;
  guint payload_length,isakmp_length;
  int length, reported_length;
  guint8 inner_next_pload;
  int start_payload_offset = 0;      /* Keep the beginning of the payload offset */
  tvbuff_t *isakmp_tvb;

  payload_length = tvb_get_ntohs(tvb, offset + TO_PAYLOAD_LENGTH);
  start_payload_offset = offset;

  /* Make the subtree. */
  payload_kink_isakmp_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                                        ett_payload_kink_isakmp, NULL, "KINK_ISAKMP");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_isakmp_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_isakmp_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  ti = proto_tree_add_uint(payload_kink_isakmp_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);
  if(payload_length <= PAYLOAD_HEADER){
    expert_add_info(pinfo, ti, &ei_kink_payload_length_small);
  }
  offset += 2;

  inner_next_pload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_isakmp_tree, hf_kink_inner_next_pload, tvb, offset, 1, inner_next_pload);
  offset += 1;

  proto_tree_add_item(payload_kink_isakmp_tree, hf_kink_qmversion, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset += 1;

  proto_tree_add_item(payload_kink_isakmp_tree, hf_kink_reserved16, tvb, offset, 2, ENC_BIG_ENDIAN);
  offset += 2;

  if(payload_length > PAYLOAD_HEADER){
    isakmp_length = payload_length - PAYLOAD_HEADER;
    length = tvb_captured_length_remaining(tvb, offset);
    if (length > (int)isakmp_length)
      length = isakmp_length;
    reported_length = tvb_reported_length_remaining(tvb, offset);
    if (reported_length > (int)isakmp_length)
      reported_length = isakmp_length;
    isakmp_tvb = tvb_new_subset(tvb, offset, length, reported_length);
    isakmp_dissect_payloads(isakmp_tvb, payload_kink_isakmp_tree, 1, inner_next_pload, 0, isakmp_length, pinfo);
  }

  /* This part consider the padding. Payload_length don't contain the padding. */
  if(payload_length % PADDING != 0){
    payload_length += (PADDING - (payload_length % PADDING));
  }
  offset = start_payload_offset + payload_length;

  if(payload_length > 0) {
    control_payload(pinfo, tvb, offset, next_payload, tree);  /* Recur control_payload() */
  }
}

static void
dissect_payload_kink_encrypt(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_encrypt_tree;
  proto_item *ti;
  guint8 next_payload;
  guint payload_length;
#ifdef HAVE_KERBEROS
  gint encrypt_length;
#endif
  guint8 inner_next_pload;
  guint16 inner_payload_length;
  int start_payload_offset = 0;    /* Keep the beginning of the payload offset */

  payload_length = tvb_get_ntohs(tvb,offset + TO_PAYLOAD_LENGTH);
  start_payload_offset = offset;

#ifdef HAVE_KERBEROS
  encrypt_length = payload_length - FROM_NP_TO_PL;
#endif
  /* Make the subtree */
  payload_kink_encrypt_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                                            ett_payload_kink_encrypt, NULL, "KINK_ENCRYPT");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_encrypt_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_encrypt_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  ti = proto_tree_add_uint(payload_kink_encrypt_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);
  if(payload_length <= PAYLOAD_HEADER){
    expert_add_info(pinfo, ti, &ei_kink_payload_length_small);
  }
  offset += 2;

  /* decrypt kink encrypt */

  if(keytype != 0){
#ifdef HAVE_KERBEROS
    tvbuff_t *next_tvb;
    guint8 *plaintext=NULL;

    next_tvb=tvb_new_subset(tvb, offset, MIN(tvb_captured_length_remaining(tvb, offset), encrypt_length), encrypt_length);
    plaintext=decrypt_krb5_data(tree, pinfo, 0, next_tvb, keytype, NULL);
    if(plaintext){
      next_tvb=tvb_new_child_real_data(tvb, plaintext, encrypt_length, encrypt_length);
      tvb_set_free_cb(next_tvb, g_free);
      add_new_data_source(pinfo, next_tvb, "decrypted kink encrypt");
      dissect_decrypt_kink_encrypt(pinfo, next_tvb, tree, encrypt_length);
    }
#endif
  }
  else{
    inner_next_pload = tvb_get_guint8(tvb, offset);
    proto_tree_add_uint(payload_kink_encrypt_tree, hf_kink_inner_next_pload, tvb, offset, 1, inner_next_pload);
    offset += 1;

    proto_tree_add_item(payload_kink_encrypt_tree, hf_kink_reserved24, tvb, offset, 3, ENC_BIG_ENDIAN);
    offset += 3;

    if(payload_length > PAYLOAD_HEADER){
      inner_payload_length = payload_length - PAYLOAD_HEADER;
      proto_tree_add_item(payload_kink_encrypt_tree, hf_kink_payload, tvb, offset, inner_payload_length, ENC_NA);
      /*offset += inner_payload_length;*/
    }
  }
  /* This part consider the padding. Payload_length don't contain the padding. */
  if(payload_length % PADDING !=0){
    payload_length += (PADDING - (payload_length % PADDING));
  }
  offset = start_payload_offset + payload_length;

  if(payload_length > 0) {
    control_payload(pinfo, tvb, offset, next_payload, tree);  /* Recur control_payload() */
  }
}

#ifdef HAVE_KERBEROS
static void
dissect_decrypt_kink_encrypt(packet_info *pinfo, tvbuff_t *tvb, proto_tree *tree, int payload_length){

  proto_tree *decrypt_kink_encrypt_tree;
  int offset=0;
  guint8 next_payload;

  decrypt_kink_encrypt_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                                    ett_decrypt_kink_encrypt, NULL, "decrypted data");

  next_payload = tvb_get_guint8(tvb, offset);

  proto_tree_add_uint(decrypt_kink_encrypt_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(decrypt_kink_encrypt_tree, hf_kink_reserved24, tvb, offset, 3, ENC_BIG_ENDIAN);
  offset += 3;

  control_payload(pinfo, tvb, offset, next_payload, decrypt_kink_encrypt_tree);
}
#endif

static const range_string kink_error_rvals[] = {
    { 0, 0,  "KINK_OK" },
    { 1, 1,  "KINK_PROTOERR" },
    { 2, 2,  "KINK_INVDOI" },
    { 3, 3,  "KINK_INVMAJ" },
    { 4, 4,  "KINK_INVMIN" },
    { 5, 5,  "KINK_INTERR" },
    { 6, 6,  "KINK_BADQMVERS" },
    { BOTTOM_RESERVED, TOP_RESERVED,  "RESERVED" },
    { BOTTOM_PRIVATE_USE, TOP_PRIVATE_USE,  "PRIVATE USE" },
    { TOP_PRIVATE_USE+1, 0xffffffff,  "This Error Code is not Defined." },
    { 0, 0, NULL }
};

static void
dissect_payload_kink_error(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_error_tree;
  proto_item *ti;
  guint8 next_payload;
  guint16 payload_length;
  int start_payload_offset = 0; /* Keep the beginning of the payload offset */

  payload_length = tvb_get_ntohs(tvb,offset + TO_PAYLOAD_LENGTH);
  start_payload_offset = offset;

  /* Make the subtree */
  payload_kink_error_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                                            ett_payload_kink_error, NULL, "KINK_ERROR");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_error_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_error_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  ti = proto_tree_add_uint(payload_kink_error_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);
  if(payload_length != KINK_ERROR_LENGTH){
    expert_add_info(pinfo, ti, &ei_kink_payload_length_mismatch);
  }
  offset += 2;

  proto_tree_add_item(payload_kink_error_tree, hf_kink_error_code, tvb, offset, 4, ENC_BIG_ENDIAN);

  offset = start_payload_offset + KINK_ERROR_LENGTH;
  control_payload(pinfo, tvb, offset, next_payload, tree);  /* Recur control_payload() */
}

static void
dissect_payload_kink_not_defined(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree){
  proto_tree *payload_kink_not_defined_tree;
  guint8 next_payload;
  guint payload_length;
  int start_payload_offset = 0;   /* Keep the beginning of the payload offset */

  start_payload_offset = offset;
  payload_length = tvb_get_ntohs(tvb, offset + TO_PAYLOAD_LENGTH);

  /* Make the subtree */
  payload_kink_not_defined_tree = proto_tree_add_subtree(tree, tvb, offset, payload_length,
                                    ett_payload_not_defined, NULL, "UNKNOWN PAYLOAD");

  next_payload = tvb_get_guint8(tvb, offset);
  proto_tree_add_uint(payload_kink_not_defined_tree, hf_kink_next_payload, tvb, offset, 1, next_payload);
  offset ++;

  proto_tree_add_item(payload_kink_not_defined_tree, hf_kink_reserved8, tvb, offset, 1, ENC_BIG_ENDIAN);
  offset ++;

  proto_tree_add_uint(payload_kink_not_defined_tree, hf_kink_payload_length, tvb, offset, 2, payload_length);

  /* This part consider the padding. Payload_length don't contain the padding. */
  if(payload_length % PADDING != 0){
    payload_length += (PADDING - (payload_length % PADDING));
  }
  offset = start_payload_offset + payload_length;

  /* XXX - prevent an endless loop if payload_length is 0, don't know the correct way to handle this! */
  if(payload_length > 0) {
    control_payload(pinfo, tvb, offset, next_payload, tree);
  }
}

static void
kink_fmt_version( gchar *result, guint32 version )
{
  guint8 major_version, minor_version;

  /* This part is the version. Consider less than 1 octet value.
   * Major version and minor version is 4bit. Front half of 1octet
   * is major version, and second half of 1octet is minor version.
   * The calculation of major version is shown below.
   * The logical product of the value of 1octet and 0xf0 is performed.
   * And It is performed 4bit right shift.
   * Secondarily, the calculation of minor version is shown below.
   * The logical product of the value of 1octet and 0x0f is performed.
   */
  major_version = (guint8)((version & FRONT_FOUR_BIT) >> VERSION_BIT_SHIFT);
  minor_version = (guint8)(version & SECOND_FOUR_BIT);

  g_snprintf( result, ITEM_LABEL_LENGTH, "%d.%02d", major_version, minor_version);
}

/* Output part */
void
proto_register_kink(void) {

  static hf_register_info hf[] = {
    { &hf_kink_type,
      { "Type", "kink.type",
        FT_UINT8,       BASE_DEC,       VALS(kink_type_vals),   0x0,
        NULL, HFILL }},
    { &hf_kink_length,
      { "Length",       "kink.length",
        FT_UINT16,      BASE_DEC,       NULL,   0x0,
        NULL, HFILL }},
    { &hf_kink_transactionId,
      { "Transaction ID",       "kink.transactionId",
        FT_UINT32,      BASE_DEC,       NULL,   0x0,
        NULL, HFILL }},
    { &hf_kink_checkSumLength,
      { "Checksum Length",       "kink.checkSumLength",
        FT_UINT8,       BASE_DEC,       NULL,   0x0,
        NULL, HFILL }},
    { &hf_kink_A,
      { "A",       "kink.A",
        FT_UINT8,       BASE_DEC,       VALS(kink_A_vals),      0x0,
        NULL, HFILL }},
    { &hf_kink_version,
      { "Version",       "kink.version",
        FT_UINT8,       BASE_CUSTOM,       CF_FUNC(kink_fmt_version),      0x0,
        NULL, HFILL }},
    { &hf_kink_domain_of_interpretation,
      { "Domain Of Interpretation",       "kink.domain_of_interpretation",
        FT_UINT32,      BASE_DEC,       NULL,   0x0,
        NULL, HFILL }},
    { &hf_kink_qmversion,
      { "QMVersion",       "kink.qmversion",
        FT_UINT8,       BASE_CUSTOM,       CF_FUNC(kink_fmt_version),      0x0,
        NULL, HFILL }},
    { &hf_kink_error_code,
      { "ErrorCode",       "kink.error_code",
        FT_UINT32,      BASE_DEC|BASE_RANGE_STRING,       RVALS(kink_error_rvals),   0x0,
        NULL, HFILL }},
    { &hf_kink_reserved8,
      { "Reserved",       "kink.reserved",
        FT_UINT8,      BASE_DEC,       NULL,   0x0,
        NULL, HFILL }},
    { &hf_kink_reserved15,
      { "Reserved",       "kink.reserved",
        FT_UINT16,      BASE_DEC,       NULL,   SECOND_FIFTEEN_BIT,
        NULL, HFILL }},
    { &hf_kink_reserved16,
      { "Reserved",       "kink.reserved",
        FT_UINT16,      BASE_DEC,       NULL,   0,
        NULL, HFILL }},
    { &hf_kink_reserved24,
      { "Reserved",       "kink.reserved",
        FT_UINT24,      BASE_DEC,       NULL,   0,
        NULL, HFILL }},
    { &hf_kink_checkSum,
      { "Checksum",       "kink.checkSum",
        FT_BYTES,       BASE_NONE,      NULL,   0x0,
        NULL, HFILL }},
    { &hf_kink_next_payload,
      { "Next Payload",       "kink.nextPayload",
        FT_UINT8,       BASE_DEC,       VALS(kink_next_payload),        0x0,
        NULL, HFILL }},
    { &hf_kink_payload_length,
      { "Payload Length",       "kink.payloadLength",
        FT_UINT8,       BASE_DEC,       NULL,        0x0,
        NULL, HFILL }},
    { &hf_kink_epoch,
      { "EPOCH",       "kink.epoch",
        FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC,       NULL,        0x0,
        NULL, HFILL }},
    { &hf_kink_inner_next_pload,
      { "InnerNextPload",       "kink.innerNextPload",
        FT_UINT8,       BASE_DEC,       NULL,        0x0,
        NULL, HFILL }},
    { &hf_kink_realm_name_length,
      { "RealmNameLength",       "kink.realmNameLength",
        FT_UINT16,      BASE_DEC,       NULL,   0,
        NULL, HFILL }},
    { &hf_kink_realm_name,
      { "RealmName",       "kink.realmName",
        FT_STRING,      BASE_NONE,       NULL,   0,
        NULL, HFILL }},
    { &hf_kink_princ_name_length,
      { "PrincNameLength",       "kink.princNameLength",
        FT_UINT16,      BASE_DEC,       NULL,   0,
        NULL, HFILL }},
    { &hf_kink_princ_name,
      { "PrincName",       "kink.princName",
        FT_STRING,      BASE_NONE,       NULL,   0,
        NULL, HFILL }},
    { &hf_kink_tgt_length,
      { "TGT Length",       "kink.tgtLength",
        FT_UINT16,      BASE_DEC,       NULL,   0,
        NULL, HFILL }},
    { &hf_kink_tgt,
      { "TGT",       "kink.tgt",
        FT_STRING,      BASE_NONE,       NULL,   0,
        NULL, HFILL }},
    { &hf_kink_payload,
      { "Payload",       "kink.payload",
        FT_BYTES,      BASE_NONE,       NULL,   0,
        NULL, HFILL }},
  };

  /* Argument for making the subtree. */
  static gint *ett[] = {
    &ett_kink,
    /*    &ett_kink_version, */
    &ett_kink_payload,
    &ett_payload_kink_ap_req,
    &ett_payload_kink_ap_rep,
    &ett_payload_kink_krb_error,
    &ett_payload_kink_tgt_req,
    &ett_payload_kink_tgt_rep,
    &ett_payload_kink_isakmp,
    &ett_payload_kink_encrypt,
    &ett_payload_kink_error,
    &ett_payload_not_defined,
    &ett_decrypt_kink_encrypt,

  };

  static ei_register_info ei[] = {
     { &ei_kink_payload_length_small, { "kink.payload_length_small", PI_PROTOCOL, PI_WARN, "This Payload Length is too small", EXPFILL }},
     { &ei_kink_payload_length_mismatch, { "kink.payload_length_mismatch", PI_PROTOCOL, PI_WARN, "This Payload Length is mismatch", EXPFILL }},
  };

  expert_module_t* expert_kink;

  proto_kink = proto_register_protocol("Kerberized Internet Negotiation of Key", "KINK", "kink");
  proto_register_field_array(proto_kink, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));
  expert_kink = expert_register_protocol(proto_kink);
  expert_register_field_array(expert_kink, ei, array_length(ei));

}

void proto_reg_handoff_kink(void) {

  dissector_handle_t kink_handle = NULL;

  kink_handle = create_dissector_handle(dissect_kink, proto_kink);

  dissector_add_uint("udp.port", KINK_PORT, kink_handle);

}

/*
 * 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:
 */