path: root/epan/tcap-persistentdata.c

/*
 * tcap-persistentdata.c
 * Source for lists and hash tables used in wireshark's tcap dissector
 * for calculation of delays in tcap-calls
 * Copyright 2006 Florent Drouin (based on h225-persistentdata.c from Lars Roland)
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <glib.h>
#include <stdio.h>
#include <string.h>

#include "epan/emem.h"
#include "epan/packet.h"
#include "epan/conversation.h"
#include "epan/tcap-persistentdata.h"
#include "epan/dissectors/packet-tcap.h"
#include "epan/dissectors/packet-mtp3.h"

static gint tcaphash_context_equal(gconstpointer k1, gconstpointer k2);
static guint tcaphash_context_calchash(gconstpointer k);
static gint tcaphash_begin_equal(gconstpointer k1, gconstpointer k2);
static guint tcaphash_begin_calchash(gconstpointer k);
static gint tcaphash_cont_equal(gconstpointer k1, gconstpointer k2);
static guint tcaphash_cont_calchash(gconstpointer k);
static gint tcaphash_end_equal(gconstpointer k1, gconstpointer k2);
static guint tcaphash_end_calchash(gconstpointer k);

static void update_tcaphash_begincall(struct tcaphash_begincall_t *p_tcaphash_begincall,
				      packet_info *pinfo );

static struct tcaphash_begincall_t *append_tcaphash_begincall(struct tcaphash_begincall_t *prev_begincall,
							      struct tcaphash_context_t *p_tcaphash_context,
							      packet_info *pinfo);


static struct tcaphash_begincall_t *find_tcaphash_begin(struct tcaphash_begin_info_key_t *p_tcaphash_begin_key,
							packet_info *pinfo,
							gboolean isBegin);


static struct tcaphash_contcall_t *find_tcaphash_cont(struct tcaphash_cont_info_key_t *p_tcaphash_cont_key,
						      packet_info *pinfo);

static struct tcaphash_endcall_t *find_tcaphash_end(struct tcaphash_end_info_key_t *p_tcaphash_end_key,
						    packet_info *pinfo,
						    gboolean isEnd);
/* new key */
static struct tcaphash_context_t *new_tcaphash_context(struct tcaphash_context_key_t *p_tcaphash_context_key,
						       packet_info *pinfo);

static struct tcaphash_begincall_t *new_tcaphash_begin(struct tcaphash_begin_info_key_t *p_tcaphash_begin_key,
						       struct tcaphash_context_t *p_tcaphash_context);

static struct tcaphash_contcall_t *new_tcaphash_cont(struct tcaphash_cont_info_key_t *p_tcaphash_cont_key,
						     struct tcaphash_context_t *p_tcaphash_context);

static struct tcaphash_endcall_t *new_tcaphash_end(struct tcaphash_end_info_key_t *p_tcaphash_end_key,
						   struct tcaphash_context_t *p_tcaphash_context);

static struct tcaphash_context_t *tcaphash_begin_matching(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
							  struct tcapsrt_info_t *p_tcapsrt_info);

static struct tcaphash_context_t *tcaphash_cont_matching(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
							 struct tcapsrt_info_t *p_tcapsrt_info);

static struct tcaphash_context_t *tcaphash_end_matching(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
							struct tcapsrt_info_t *p_tcapsrt_info);

struct tcapsrt_info_t *tcapsrt_razinfo(void);

/* When several Tcap components are received in a single TCAP message,
   we have to use several buffers for the stored parameters
   because else this data are erased during TAP dissector call */
#define MAX_TCAP_INSTANCE 10
int tcapsrt_global_current=0;
struct tcapsrt_info_t tcapsrt_global_info[MAX_TCAP_INSTANCE];

/* These two timeout (in second) are used when some message are lost,
   or when the same TCAP transcation identifier is reused */
guint gtcap_RepetitionTimeout = 10;
guint gtcap_LostTimeout = 30;
extern gboolean gtcap_HandleSRT;
gboolean gtcap_PersistentSRT=FALSE;
gboolean gtcap_DisplaySRT=FALSE;
gboolean gtcap_StatSRT=FALSE;

extern int hf_tcapsrt_SessionId;
extern int hf_tcapsrt_Duplicate;
extern int hf_tcapsrt_BeginSession;
extern int hf_tcapsrt_EndSession;
extern int hf_tcapsrt_SessionTime;

/* Global hash tables*/
static GHashTable *tcaphash_context = NULL;
static GHashTable *tcaphash_begin = NULL;
static GHashTable *tcaphash_cont = NULL;
static GHashTable *tcaphash_end = NULL;

guint32 tcapsrt_global_SessionId=1;

/*
 * DEBUG fonctions
 */

#undef DEBUG_TCAPSRT
/* #define DEBUG_TCAPSRT */

#ifdef DEBUG_TCAPSRT
#include <stdio.h>
#include <stdarg.h>
static unsigned debug_level = 99;

static void
dbg(unsigned  level, char* fmt, ...)
{
  va_list ap;
  
  if (level > debug_level) return;
  va_start(ap,fmt);
  vfprintf(stderr, fmt, ap);
  va_end(ap);
}
#endif

static gint
tcaphash_context_equal(gconstpointer k1, gconstpointer k2)
{
  const struct tcaphash_context_key_t *key1 = (const struct tcaphash_context_key_t *) k1;
  const struct tcaphash_context_key_t *key2 = (const struct tcaphash_context_key_t *) k2;
  
  return (key1->session_id == key2->session_id);
}

/* calculate a hash key */
static guint
tcaphash_context_calchash(gconstpointer k)
{
  const struct tcaphash_context_key_t *key = (const struct tcaphash_context_key_t *) k;
  return key->session_id;
}


static gint
tcaphash_begin_equal(gconstpointer k1, gconstpointer k2)
{
  const struct tcaphash_begin_info_key_t *key1 = (const struct tcaphash_begin_info_key_t *) k1;
  const struct tcaphash_begin_info_key_t *key2 = (const struct tcaphash_begin_info_key_t *) k2;

  if (key1->hashKey == key2->hashKey) {
    
    if ( ( (key1->opc_hash == key2->opc_hash) &&
	   (key1->dpc_hash == key2->dpc_hash) &&
	   (key1->tid == key2->tid) ) 
	 ||
	 ( (key1->opc_hash == key2->dpc_hash) &&
	   (key1->dpc_hash == key2->opc_hash) &&
	   (key1->tid == key2->tid) ) 
	 )
      return TRUE;
  }
  return FALSE;
}

/* calculate a hash key */
static guint
tcaphash_begin_calchash(gconstpointer k)
{
  const struct tcaphash_begin_info_key_t *key = (const struct tcaphash_begin_info_key_t *) k;
  guint hashkey;
  /* hashkey = key->opc_hash<<16 + key->dpc_hash<<8 + key->src_tid; */
  hashkey = key->tid;
  return hashkey;
}

static gint
tcaphash_cont_equal(gconstpointer k1, gconstpointer k2)
{
  const struct tcaphash_cont_info_key_t *key1 = (const struct tcaphash_cont_info_key_t *) k1;
  const struct tcaphash_cont_info_key_t *key2 = (const struct tcaphash_cont_info_key_t *) k2;

  if (key1->hashKey == key2->hashKey) {

    if ( (key1->opc_hash == key2->opc_hash) &&
	 (key1->dpc_hash == key2->dpc_hash) &&
	 (key1->src_tid == key2->src_tid) &&
	 (key1->dst_tid == key2->dst_tid) ) {
      return TRUE;
    } 
    else if ( (key1->opc_hash == key2->dpc_hash) &&
	      (key1->dpc_hash == key2->opc_hash) &&
	      (key1->src_tid == key2->dst_tid) &&
	      (key1->dst_tid == key2->src_tid) ) {
      return TRUE;
    }
  }
  return FALSE;
}

/* calculate a hash key */
static guint
tcaphash_cont_calchash(gconstpointer k)
{
  const struct tcaphash_cont_info_key_t *key = (const struct tcaphash_cont_info_key_t *) k;
  guint hashkey;
  hashkey = key->src_tid + key->dst_tid;
  return hashkey;
}


static gint
tcaphash_end_equal(gconstpointer k1, gconstpointer k2)
{
  const struct tcaphash_end_info_key_t *key1 = (const struct tcaphash_end_info_key_t *) k1;
  const struct tcaphash_end_info_key_t *key2 = (const struct tcaphash_end_info_key_t *) k2;

  if (key1->hashKey == key2->hashKey) {
    if ( ( (key1->opc_hash == key2->opc_hash) &&
	   (key1->dpc_hash == key2->dpc_hash) &&
	   (key1->tid == key2->tid) ) 
	 ||
	 ( (key1->opc_hash == key2->dpc_hash) &&
	   (key1->dpc_hash == key2->opc_hash) &&
	   (key1->tid == key2->tid) ) ) 
      return TRUE;
  }
  return FALSE;
}

/* calculate a hash key */
static guint
tcaphash_end_calchash(gconstpointer k)
{
  const struct tcaphash_end_info_key_t *key = (const struct tcaphash_end_info_key_t *) k;
  guint hashkey;
  hashkey = key->tid;
  return hashkey;
}

/* 
 * Update a record with the data of the Request 
 */
static void
update_tcaphash_begincall(struct tcaphash_begincall_t *p_tcaphash_begincall,
			  packet_info *pinfo)
{
  p_tcaphash_begincall->context->first_frame = pinfo->fd->num;
  p_tcaphash_begincall->context->last_frame = 0;
  p_tcaphash_begincall->context->responded = FALSE;
  p_tcaphash_begincall->context->begin_time = pinfo->fd->abs_ts;
}

/* 
 * Append a new dialogue, using the same Key, to the chained list
 * The time is stored too 
 */
static struct tcaphash_begincall_t *
append_tcaphash_begincall(struct tcaphash_begincall_t *prev_begincall,
			  struct tcaphash_context_t *p_tcaphash_context,
			  packet_info *pinfo)
{
  struct tcaphash_begincall_t *p_new_tcaphash_begincall = NULL;
  
  /* Append the transaction to the list, when the same key is found
     This should append when the tcap-transaction Id is reused  */

  p_new_tcaphash_begincall = se_alloc0(sizeof(struct tcaphash_begincall_t));
  p_new_tcaphash_begincall->context=p_tcaphash_context;
  p_tcaphash_context->begincall=p_new_tcaphash_begincall;
  p_new_tcaphash_begincall->beginkey=prev_begincall->beginkey;
  p_new_tcaphash_begincall->context->first_frame = pinfo->fd->num;
  p_new_tcaphash_begincall->next_begincall=NULL; 
  p_new_tcaphash_begincall->previous_begincall=prev_begincall;
  p_new_tcaphash_begincall->father=FALSE;

#ifdef DEBUG_TCAPSRT
  dbg(10,"+B%d ", p_new_tcaphash_begincall->context->session_id);
#endif
  /* Insert in the chained list */
  prev_begincall->next_begincall = p_new_tcaphash_begincall;
  if (prev_begincall->context->last_frame == 0) {
#ifdef DEBUG_TCAPSRT
    dbg(10,"last ");
#endif
    prev_begincall->context->last_frame = pinfo->fd->num-1;
  }
  return p_new_tcaphash_begincall;
}

static struct tcaphash_contcall_t *
append_tcaphash_contcall(struct tcaphash_contcall_t *prev_contcall,
			 struct tcaphash_context_t *p_tcaphash_context)
{
  struct tcaphash_contcall_t *p_new_tcaphash_contcall = NULL;
  
  /* Append the transaction to the list, when the same key is found
     This should append when the tcap-transaction Id is reused  */
  
  p_new_tcaphash_contcall = se_alloc0(sizeof(struct tcaphash_contcall_t));
  p_new_tcaphash_contcall->context=p_tcaphash_context;
  p_tcaphash_context->contcall=p_new_tcaphash_contcall;
  p_new_tcaphash_contcall->contkey=prev_contcall->contkey;
  p_new_tcaphash_contcall->next_contcall=NULL; 
  p_new_tcaphash_contcall->previous_contcall=prev_contcall;
  p_new_tcaphash_contcall->father=FALSE;

#ifdef DEBUG_TCAPSRT
  dbg(10,"+C%d ", p_new_tcaphash_contcall->context->session_id);
#endif
  /* Insert in the chained list */
  prev_contcall->next_contcall = p_new_tcaphash_contcall;
  return p_new_tcaphash_contcall;
}


static struct tcaphash_endcall_t *
append_tcaphash_endcall(struct tcaphash_endcall_t *prev_endcall,
			struct tcaphash_context_t *p_tcaphash_context)
{
  struct tcaphash_endcall_t *p_new_tcaphash_endcall = NULL;
  
  /* Append the transaction to the list, when the same key is found
     This should append when the tcap-transaction Id is reused  */

  p_new_tcaphash_endcall = se_alloc0(sizeof(struct tcaphash_endcall_t));
  p_new_tcaphash_endcall->context=p_tcaphash_context;
  p_tcaphash_context->endcall=p_new_tcaphash_endcall;
  p_new_tcaphash_endcall->endkey=prev_endcall->endkey;
  p_new_tcaphash_endcall->next_endcall=NULL; 
  p_new_tcaphash_endcall->previous_endcall=prev_endcall;
  p_new_tcaphash_endcall->father=FALSE;

#ifdef DEBUG_TCAPSRT
  dbg(10,"+E%d ", p_new_tcaphash_endcall->context->session_id);
#endif
  /* Insert in the chained list */
  prev_endcall->next_endcall = p_new_tcaphash_endcall;
  return p_new_tcaphash_endcall;
}


/* 
 * Find the dialog by Key and Time 
 */
static struct tcaphash_begincall_t *
find_tcaphash_begin(struct tcaphash_begin_info_key_t *p_tcaphash_begin_key,
		    packet_info *pinfo, gboolean isBegin)
{
  struct tcaphash_begincall_t *p_tcaphash_begincall = NULL;
  p_tcaphash_begincall = (struct tcaphash_begincall_t *)g_hash_table_lookup(tcaphash_begin, p_tcaphash_begin_key);
  
  if(p_tcaphash_begincall) {
    do {
      if ( p_tcaphash_begincall->context ) {
	if ( ( isBegin &&
	       pinfo->fd->num == p_tcaphash_begincall->context->first_frame )
	     ||
	     ( !isBegin &&
	       pinfo->fd->num >= p_tcaphash_begincall->context->first_frame &&
	       ( p_tcaphash_begincall->context->last_frame?pinfo->fd->num <= p_tcaphash_begincall->context->last_frame:1 )
	       ) 
	     ) {
	  /* We have a dialogue, with this key, opened before this request */
#ifdef DEBUG_TCAPSRT
	  dbg(10,"B%d ", p_tcaphash_begincall->context->session_id);
#endif
	  return p_tcaphash_begincall;
	  break;
	}
      }
      /* Break when list end is reached */
      if(p_tcaphash_begincall->next_begincall == NULL) {
#ifdef DEBUG_TCAPSRT
	dbg(23,"End of Blist ");
#endif
	break;
      }
      p_tcaphash_begincall = p_tcaphash_begincall->next_begincall;
    } while (p_tcaphash_begincall != NULL) ;
  } else {
#ifdef DEBUG_TCAPSRT
    dbg(23,"Not in Bhash ");
#endif  
  }
  return NULL;
}



static struct tcaphash_contcall_t *
find_tcaphash_cont(struct tcaphash_cont_info_key_t *p_tcaphash_cont_key,
		   packet_info *pinfo)
{
  struct tcaphash_contcall_t *p_tcaphash_contcall = NULL;
  p_tcaphash_contcall = (struct tcaphash_contcall_t *)g_hash_table_lookup(tcaphash_cont, p_tcaphash_cont_key);
  
  if(p_tcaphash_contcall) {
    do {
      if ( p_tcaphash_contcall->context &&
	   pinfo->fd->num >= p_tcaphash_contcall->context->first_frame &&
	   (p_tcaphash_contcall->context->last_frame?pinfo->fd->num <= p_tcaphash_contcall->context->last_frame:1) ) {
	/* We have a dialogue, with this key, opened before this request */
#ifdef DEBUG_TCAPSRT
	dbg(10,"C%d ", p_tcaphash_contcall->context->session_id);
#endif  
	return p_tcaphash_contcall;
	break;
      } else {
#ifdef DEBUG_TCAPSRT
	dbg(23,"Bug in Clist ");
#endif
      }
      /* Break when list end is reached */
      if(p_tcaphash_contcall->next_contcall == NULL) {
#ifdef DEBUG_TCAPSRT
	dbg(23,"End of Clist ");
#endif
	break;
      }
      p_tcaphash_contcall = p_tcaphash_contcall->next_contcall;
    } while (p_tcaphash_contcall != NULL) ;
  } else {
#ifdef DEBUG_TCAPSRT
    dbg(23,"Not in Chash ");
#endif
  }  
  return NULL;
}

static struct tcaphash_endcall_t *
find_tcaphash_end(struct tcaphash_end_info_key_t *p_tcaphash_end_key,
		  packet_info *pinfo, gboolean isEnd)
{
  struct tcaphash_endcall_t *p_tcaphash_endcall = NULL;
  p_tcaphash_endcall = (struct tcaphash_endcall_t *)g_hash_table_lookup(tcaphash_end, p_tcaphash_end_key);
    
  if(p_tcaphash_endcall) {
    do {
      if ( p_tcaphash_endcall->context ) {
	if ( ( isEnd &&
	       (p_tcaphash_endcall->context->last_frame?pinfo->fd->num == p_tcaphash_endcall->context->last_frame:1) 
	       )
	     ||
	     ( !isEnd &&
	       pinfo->fd->num >= p_tcaphash_endcall->context->first_frame &&
	       (p_tcaphash_endcall->context->last_frame?pinfo->fd->num <= p_tcaphash_endcall->context->last_frame:1) 
	       )
	     ) {
	  /* We have a dialogue, with this key, opened before this request */
#ifdef DEBUG_TCAPSRT
	  dbg(10,"E%d ", p_tcaphash_endcall->context->session_id);
#endif  
	  return p_tcaphash_endcall;
	  break;
	} else {
#ifdef DEBUG_TCAPSRT
	  dbg(23,"Bug in Elist ");
#endif
	}
      }
      /* Break when list end is reached */
      if(p_tcaphash_endcall->next_endcall == NULL) {
#ifdef DEBUG_TCAPSRT
	dbg(23,"End of Elist ");
#endif
	break;
      }
      p_tcaphash_endcall = p_tcaphash_endcall->next_endcall;
    } while (p_tcaphash_endcall != NULL) ;
  } else {
#ifdef DEBUG_TCAPSRT
    dbg(23,"Not in Ehash ");
#endif
  }  
  return NULL;
}

/*
 * New record to create, to identify a new transaction 
 */
static struct tcaphash_context_t *
new_tcaphash_context(struct tcaphash_context_key_t *p_tcaphash_context_key,
		     packet_info *pinfo)
{
  struct tcaphash_context_key_t *p_new_tcaphash_context_key;
  struct tcaphash_context_t *p_new_tcaphash_context = NULL;
  
  /* Register the transaction in the hash table 
     with the tcap transaction Id as Main Key
     Once created, this entry will be updated later */

  p_new_tcaphash_context_key = se_alloc(sizeof(struct tcaphash_context_key_t));
  p_new_tcaphash_context_key->session_id = p_tcaphash_context_key->session_id;

  p_new_tcaphash_context = se_alloc0(sizeof(struct tcaphash_context_t));
  p_new_tcaphash_context->key = p_new_tcaphash_context_key;
  p_new_tcaphash_context->session_id = p_tcaphash_context_key->session_id;
  p_new_tcaphash_context->first_frame = pinfo->fd->num;
#ifdef DEBUG_TCAPSRT
  dbg(10,"S%d ", p_new_tcaphash_context->session_id);
#endif
  /* store it */
  g_hash_table_insert(tcaphash_context, p_new_tcaphash_context_key, p_new_tcaphash_context);
  return p_new_tcaphash_context;
}

/*
 * New record to create, to identify a new transaction 
 */
static struct tcaphash_begincall_t *
new_tcaphash_begin(struct tcaphash_begin_info_key_t *p_tcaphash_begin_key,
		   struct tcaphash_context_t *p_tcaphash_context)
{
  struct tcaphash_begin_info_key_t *p_new_tcaphash_begin_key;
  struct tcaphash_begincall_t *p_new_tcaphash_begincall = NULL;
  
  /* Register the transaction in the hash table 
     with the tcap transaction Id as Main Key
     Once created, this entry will be updated later */

  p_new_tcaphash_begin_key = se_alloc(sizeof(struct tcaphash_begin_info_key_t));
  p_new_tcaphash_begin_key->hashKey = p_tcaphash_begin_key->hashKey;
  p_new_tcaphash_begin_key->tid = p_tcaphash_begin_key->tid;
  p_new_tcaphash_begin_key->opc_hash = p_tcaphash_begin_key->opc_hash;
  p_new_tcaphash_begin_key->dpc_hash = p_tcaphash_begin_key->dpc_hash;

  p_new_tcaphash_begincall = se_alloc0(sizeof(struct tcaphash_begincall_t));
  p_new_tcaphash_begincall->beginkey=p_new_tcaphash_begin_key;
  p_new_tcaphash_begincall->context=p_tcaphash_context;
  p_tcaphash_context->begincall=p_new_tcaphash_begincall;
  p_new_tcaphash_begincall->father=TRUE;
  p_new_tcaphash_begincall->next_begincall=NULL;
  p_new_tcaphash_begincall->previous_begincall=NULL;

#ifdef DEBUG_TCAPSRT
  dbg(10,"B%d ", p_new_tcaphash_begincall->context->session_id);
#endif
  /* store it */
  g_hash_table_insert(tcaphash_begin, p_new_tcaphash_begin_key, p_new_tcaphash_begincall);
  return p_new_tcaphash_begincall;
}



/*
 * New record to create, to identify a new transaction 
 */
static struct tcaphash_contcall_t *
new_tcaphash_cont(struct tcaphash_cont_info_key_t *p_tcaphash_cont_key,
		  struct tcaphash_context_t *p_tcaphash_context)
{
  struct tcaphash_cont_info_key_t *p_new_tcaphash_cont_key;
  struct tcaphash_contcall_t *p_new_tcaphash_contcall = NULL;
  
  /* Register the transaction in the hash table 
     with the tcap transaction Id as Main Key
     Once created, this entry will be updated later */

  p_new_tcaphash_cont_key = se_alloc(sizeof(struct tcaphash_cont_info_key_t));
  p_new_tcaphash_cont_key->hashKey = p_tcaphash_cont_key->hashKey;
  p_new_tcaphash_cont_key->src_tid = p_tcaphash_cont_key->src_tid;
  p_new_tcaphash_cont_key->dst_tid = p_tcaphash_cont_key->dst_tid;
  p_new_tcaphash_cont_key->opc_hash = p_tcaphash_cont_key->opc_hash;
  p_new_tcaphash_cont_key->dpc_hash = p_tcaphash_cont_key->dpc_hash;
  
  p_new_tcaphash_contcall = se_alloc0(sizeof(struct tcaphash_contcall_t));
  p_new_tcaphash_contcall->contkey=p_new_tcaphash_cont_key; 
  p_new_tcaphash_contcall->context=p_tcaphash_context;
  p_tcaphash_context->contcall=p_new_tcaphash_contcall;
  p_new_tcaphash_contcall->father=TRUE;
  p_new_tcaphash_contcall->next_contcall=NULL;
  p_new_tcaphash_contcall->previous_contcall=NULL;

#ifdef DEBUG_TCAPSRT
  dbg(10,"C%d ", p_new_tcaphash_contcall->context->session_id);
#endif
  /* store it */
  g_hash_table_insert(tcaphash_cont, p_new_tcaphash_cont_key, p_new_tcaphash_contcall);
  return p_new_tcaphash_contcall;
}


/*
 * New record to create, to identify a new transaction 
 */
static struct tcaphash_endcall_t *
new_tcaphash_end(struct tcaphash_end_info_key_t *p_tcaphash_end_key,
		 struct tcaphash_context_t *p_tcaphash_context)
{
  struct tcaphash_end_info_key_t *p_new_tcaphash_end_key;
  struct tcaphash_endcall_t *p_new_tcaphash_endcall = NULL;
  
  /* Register the transaction in the hash table 
     with the tcap transaction Id as Main Key
     Once created, this entry will be updated later */

  p_new_tcaphash_end_key = se_alloc(sizeof(struct tcaphash_end_info_key_t));
  p_new_tcaphash_end_key->hashKey = p_tcaphash_end_key->hashKey;
  p_new_tcaphash_end_key->tid = p_tcaphash_end_key->tid;
  p_new_tcaphash_end_key->opc_hash = p_tcaphash_end_key->opc_hash;
  p_new_tcaphash_end_key->dpc_hash = p_tcaphash_end_key->dpc_hash;

  p_new_tcaphash_endcall = se_alloc0(sizeof(struct tcaphash_endcall_t));
  p_new_tcaphash_endcall->endkey=p_new_tcaphash_end_key;
  p_new_tcaphash_endcall->context=p_tcaphash_context;
  p_tcaphash_context->endcall=p_new_tcaphash_endcall; 
  p_new_tcaphash_endcall->father=TRUE;
  p_new_tcaphash_endcall->next_endcall=NULL;
  p_new_tcaphash_endcall->previous_endcall=NULL;
  
#ifdef DEBUG_TCAPSRT
  dbg(10,"E%d ", p_new_tcaphash_endcall->context->session_id);
#endif
  /* store it */
  g_hash_table_insert(tcaphash_end, p_new_tcaphash_end_key, p_new_tcaphash_endcall);
  return p_new_tcaphash_endcall;
}



static struct tcaphash_contcall_t * 
create_tcaphash_cont(struct tcaphash_cont_info_key_t *p_tcaphash_cont_key,
		     struct tcaphash_context_t *p_tcaphash_context)
{
  struct tcaphash_contcall_t *p_tcaphash_contcall1 = NULL;
  struct tcaphash_contcall_t *p_tcaphash_contcall = NULL;

  p_tcaphash_contcall1 = (struct tcaphash_contcall_t *)
    g_hash_table_lookup(tcaphash_cont, p_tcaphash_cont_key);
  
  if (p_tcaphash_contcall1) {
    /* Walk through list of transaction with identical keys */
    /* go the the end to insert new record */
    do {
      if (!p_tcaphash_contcall1->next_contcall) {
	p_tcaphash_contcall=append_tcaphash_contcall(p_tcaphash_contcall1,
						     p_tcaphash_context);
	break;
      }
      p_tcaphash_contcall1 = p_tcaphash_contcall1->next_contcall;
    } while (p_tcaphash_contcall1 != NULL );
  } else {
    p_tcaphash_contcall = new_tcaphash_cont(p_tcaphash_cont_key,
					    p_tcaphash_context);
  }
  return p_tcaphash_contcall;
}


static struct tcaphash_endcall_t * 
create_tcaphash_end(struct tcaphash_end_info_key_t *p_tcaphash_end_key,
		    struct tcaphash_context_t *p_tcaphash_context)
{
  struct tcaphash_endcall_t *p_tcaphash_endcall1 = NULL;
  struct tcaphash_endcall_t *p_tcaphash_endcall = NULL;
  
  p_tcaphash_endcall1 = (struct tcaphash_endcall_t *)
    g_hash_table_lookup(tcaphash_end, p_tcaphash_end_key);
  
  if (p_tcaphash_endcall1) {
    /* Walk through list of transaction with identical keys */
    /* go the the end to insert new record */
    do {
      if (!p_tcaphash_endcall1->next_endcall) {
	p_tcaphash_endcall=append_tcaphash_endcall(p_tcaphash_endcall1,
						   p_tcaphash_context);
	break;
      }
      p_tcaphash_endcall1 = p_tcaphash_endcall1->next_endcall;
    } while (p_tcaphash_endcall1 != NULL );
  } else {
    p_tcaphash_endcall = new_tcaphash_end(p_tcaphash_end_key,
					  p_tcaphash_context);
  }
  return p_tcaphash_endcall;
}


/*
 * Routine called when the TAP is initialized.
 * so hash table are (re)created
 */
void
tcapsrt_init_routine(void)
{

  /* free hash-tables and mem_chunks for SRT */
  if (tcaphash_context != NULL) {
#ifdef DEBUG_TCAPSRT
    dbg(16,"Destroy hash_context ");
#endif
    g_hash_table_destroy(tcaphash_context);
  }

  if (tcaphash_begin != NULL) {
#ifdef DEBUG_TCAPSRT
    dbg(16,"Destroy hash_begin ");
#endif
    g_hash_table_destroy(tcaphash_begin);
  }  

  if (tcaphash_cont != NULL) {
#ifdef DEBUG_TCAPSRT
    dbg(16,"Destroy hash_cont ");
#endif
    g_hash_table_destroy(tcaphash_cont);
  }

  if (tcaphash_end != NULL) {
#ifdef DEBUG_TCAPSRT
    dbg(16,"Destroy hash_end ");
#endif
    g_hash_table_destroy(tcaphash_end);
  }

#ifdef DEBUG_TCAPSRT
  dbg(16,"Create hash ");
#endif
  /* create new hash-tables and mem_chunks for SRT */
  tcaphash_context = g_hash_table_new(tcaphash_context_calchash, tcaphash_context_equal);
  tcaphash_begin = g_hash_table_new(tcaphash_begin_calchash, tcaphash_begin_equal);
  tcaphash_cont = g_hash_table_new(tcaphash_cont_calchash, tcaphash_cont_equal);
  tcaphash_end = g_hash_table_new(tcaphash_end_calchash, tcaphash_end_equal);

  /* Reset the session counter */
  tcapsrt_global_SessionId=1;

  /* Display of SRT only if Persistent Stat */
  gtcap_DisplaySRT=gtcap_PersistentSRT || gtcap_HandleSRT&gtcap_StatSRT;
}

/*
 * Service Responsee Time analyze
 * Called just after dissector call 
 */
struct tcaphash_context_t *
tcapsrt_call_matching(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
		      struct tcapsrt_info_t *p_tcapsrt_info)
{
  struct tcaphash_context_t *tcap_context=NULL;

  switch (p_tcapsrt_info->ope) {
    
  case TC_BEGIN:  /*InitialDP*/
#ifdef DEBUG_TCAPSRT
    dbg(1,"TC_BEGIN ");
#endif
    tcap_context=tcaphash_begin_matching(tvb, pinfo, tree, p_tcapsrt_info);
    break;

  case TC_CONT:
#ifdef DEBUG_TCAPSRT
    dbg(1,"TC_CONT ");
#endif 
    tcap_context=tcaphash_cont_matching(tvb, pinfo, tree, p_tcapsrt_info);
    break;

  case TC_ABORT:
#ifdef DEBUG_TCAPSRT
    dbg(1,"TC_ABORT ");
#endif 
    tcap_context=tcaphash_end_matching(tvb, pinfo, tree, p_tcapsrt_info);
    break;
    
  case TC_END:
#ifdef DEBUG_TCAPSRT
    dbg(1,"TC_END ");
#endif
    tcap_context=tcaphash_end_matching(tvb, pinfo, tree, p_tcapsrt_info);
    break;
    
  default:
#ifdef DEBUG_TCAPSRT
    dbg(1,"Unknow %d ", p_tcapsrt_info->ope);
#endif
    break;
  } /* switch tcapop */
#ifdef DEBUG_TCAPSRT
  if (tcap_context)
    dbg(1,"session %d ", tcap_context->session_id);
#endif
  return tcap_context;
}


/* 
 * Create the record identifiying the TCAP transaction
 * When the identifier for the transaction is reused, check 
 * the following criteria before to append a new record:
 * - a timeout corresponding to a message retransmission is detected, 
 * - a message hast been lost 
 * - or the previous transaction has been  be closed
 */
static struct tcaphash_context_t *
tcaphash_begin_matching(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
			struct tcapsrt_info_t *p_tcapsrt_info)
{
  struct tcaphash_context_t *p_tcaphash_context=NULL;
  struct tcaphash_context_key_t tcaphash_context_key; 
  struct tcaphash_begincall_t *p_tcaphash_begincall, *p_new_tcaphash_begincall;
  struct tcaphash_begin_info_key_t tcaphash_begin_key;
  proto_item *ti;
  
  /* prepare the key data */
  tcaphash_begin_key.tid = p_tcapsrt_info->src_tid;
  tcaphash_begin_key.opc_hash = mtp3_pc_hash( ((address *)(&pinfo->src))->data);
  tcaphash_begin_key.dpc_hash = mtp3_pc_hash( ((address *)(&pinfo->dst))->data);
  tcaphash_begin_key.hashKey=tcaphash_begin_calchash(&tcaphash_begin_key);

  /* look up the request */
#ifdef DEBUG_TCAPSRT
  dbg(10,"\n Hbegin #%d ", pinfo->fd->num);
  dbg(11,"key %lx ",tcaphash_begin_key.hashKey);
  dbg(51,"PC %s %s ",address_to_str(&pinfo->src), address_to_str(&pinfo->dst));
  dbg(51,"Tid %lx ",tcaphash_begin_key.tid);
#endif
  p_tcaphash_begincall = (struct tcaphash_begincall_t *)
    g_hash_table_lookup(tcaphash_begin, &tcaphash_begin_key);

  if (p_tcaphash_begincall) {
    /* Walk through list of transaction with identical keys */
    do { 
      /* Check if the request with this reqSeqNum has been seen, with the same Message Type */
      if (pinfo->fd->num == p_tcaphash_begincall->context->first_frame) {
	/* We have seen this request before -> do nothing */
#ifdef DEBUG_TCAPSRT
	dbg(22,"Already seen ");
#endif
	p_tcaphash_context=p_tcaphash_begincall->context;
	break;
      }
      /* If the last record for Tcap transaction with identifier has been reached */
      if (!p_tcaphash_begincall->next_begincall) {
	/* check if we have to create a new record or not */
	/* if last request has been responded (response number in known)
	   and this request appears after last response (has bigger frame number)
	   and last request occured after the timeout for repetition,
	   or 
	   if last request hasn't been responded (so number unknown)
	   and this request appears after last request (has bigger frame number)
	   and this request occured after the timeout for message lost */
	if ( ( p_tcaphash_begincall->context->last_frame != 0
	       && pinfo->fd->num > p_tcaphash_begincall->context->first_frame 
	       && (guint) pinfo->fd->abs_ts.secs > (guint)(p_tcaphash_begincall->context->begin_time.secs + gtcap_RepetitionTimeout)
	       ) ||
	     ( p_tcaphash_begincall->context->last_frame == 0
	       && pinfo->fd->num > p_tcaphash_begincall->context->first_frame
	       && (guint)pinfo->fd->abs_ts.secs > (guint)(p_tcaphash_begincall->context->begin_time.secs + gtcap_LostTimeout) 
	       ) 
	     )
	  {
	    /* we decide that we have a new request */
	    /* Append new record to the list */
#ifdef DEBUG_TCAPSRT
	    dbg(12,"(timeout) Append key %lx ",tcaphash_begin_key.hashKey);
	    dbg(12,"Frame %d rsp %d ",pinfo->fd->num,p_tcaphash_begincall->context->last_frame );
#endif  
	    tcaphash_context_key.session_id = tcapsrt_global_SessionId++;
	    p_tcaphash_context = new_tcaphash_context(&tcaphash_context_key, pinfo); 
	    p_new_tcaphash_begincall = append_tcaphash_begincall(p_tcaphash_begincall,
								 p_tcaphash_context,
								 pinfo);
	    
#ifdef DEBUG_TCAPSRT
	    dbg(12,"Update key %lx ",tcaphash_begin_key.hashKey);
#endif
	    update_tcaphash_begincall(p_new_tcaphash_begincall, pinfo);
	    p_tcaphash_begincall=p_new_tcaphash_begincall;
	  } else {
	  
	  /* If the Tid is reused for a closed Transaction */
	  /* Or if we received an InitialDP for a non closed Transaction */
	  if ( p_tcaphash_begincall->context->closed) {
#ifdef DEBUG_TCAPSRT
	    dbg(12,"(closed) Append key %lu ",tcaphash_begin_key.hashKey);
	    dbg(12,"Frame %d rsp %d ",pinfo->fd->num,p_tcaphash_begincall->context->last_frame );
#endif 
	    tcaphash_context_key.session_id = tcapsrt_global_SessionId++;
	    p_tcaphash_context = new_tcaphash_context(&tcaphash_context_key, pinfo); 
	    p_new_tcaphash_begincall = append_tcaphash_begincall(p_tcaphash_begincall,
								 p_tcaphash_context,
								 pinfo);
	    
#ifdef DEBUG_TCAPSRT
	    dbg(12,"Update key %lu ",tcaphash_begin_key.hashKey);
#endif
	    update_tcaphash_begincall(p_new_tcaphash_begincall, pinfo);
	    p_tcaphash_begincall=p_new_tcaphash_begincall;
	    
	  } else {
	    /* No, so it's a duplicate request.Mark it as such. */
#ifdef DEBUG_TCAPSRT
	    dbg(21,"Display_duplicate ");
#endif
	    if (gtcap_DisplaySRT) 
	      proto_tree_add_uint_hidden(tree, hf_tcapsrt_Duplicate, tvb, 0,0, p_tcapsrt_info->src_tid);
	    p_tcaphash_context=p_tcaphash_begincall->context;
	  } /* test with Timeout */
	} /* closed */
	break;
      } /* Next call is NULL */
      p_tcaphash_begincall = p_tcaphash_begincall->next_begincall;
    } while (p_tcaphash_begincall != NULL );
    /*
     * New TCAP context
     */
  } else { /* p_tcaphash_begincall has not been found */
#ifdef DEBUG_TCAPSRT
    dbg(10,"New key %lx ",tcaphash_begin_key.hashKey);
#endif 

    tcaphash_context_key.session_id = tcapsrt_global_SessionId++;
    p_tcaphash_context = new_tcaphash_context(&tcaphash_context_key, pinfo); 
    p_tcaphash_begincall = new_tcaphash_begin(&tcaphash_begin_key, p_tcaphash_context);
    
#ifdef DEBUG_TCAPSRT
    dbg(11,"Update key %lx ",tcaphash_begin_key.hashKey);
    dbg(11,"Frame reqlink #%d ", pinfo->fd->num);
#endif
    update_tcaphash_begincall(p_tcaphash_begincall, pinfo);
  }
  
  /* display tcap session, if available */
  if ( gtcap_DisplaySRT &&
       p_tcaphash_context &&
       p_tcaphash_context->session_id)
    proto_tree_add_uint(tree, hf_tcapsrt_SessionId, tvb, 0,0, p_tcaphash_context->session_id);
  
  /* add link to response frame, if available */
  if( gtcap_DisplaySRT &&
      p_tcaphash_begincall->context->last_frame != 0){
#ifdef DEBUG_TCAPSRT
    dbg(20,"Display_frameRsplink %d ",p_tcaphash_begincall->context->last_frame);
#endif
    ti = proto_tree_add_uint_format(tree, hf_tcapsrt_BeginSession, tvb, 0, 0, 
				    p_tcaphash_begincall->context->last_frame,
				    "End of session in frame %u",
				    p_tcaphash_begincall->context->last_frame);
    PROTO_ITEM_SET_GENERATED(ti);
  } 
  return p_tcaphash_context;
}


/*
 * Register the request, and try to find the response
 *
 */
static struct tcaphash_context_t *
tcaphash_cont_matching(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
		       struct tcapsrt_info_t *p_tcapsrt_info)
{
  struct tcaphash_context_t *p_tcaphash_context=NULL;
  struct tcaphash_contcall_t *p_tcaphash_contcall;
  struct tcaphash_cont_info_key_t tcaphash_cont_key;

#ifdef DEBUG_TCAPSRT
  dbg(10,"\n Hcont #%d ", pinfo->fd->num);
#endif 

  /* look only for matching request, if matching conversation is available. */
  tcaphash_cont_key.src_tid = p_tcapsrt_info->src_tid;
  tcaphash_cont_key.dst_tid = p_tcapsrt_info->dst_tid;
  tcaphash_cont_key.opc_hash=mtp3_pc_hash( ((address*)(&pinfo->src))->data);
  tcaphash_cont_key.dpc_hash=mtp3_pc_hash( ((address*)(&pinfo->dst))->data);
  tcaphash_cont_key.hashKey=tcaphash_cont_calchash(&tcaphash_cont_key);

#ifdef DEBUG_TCAPSRT
  dbg(11,"Ckey %lx ", tcaphash_cont_key.hashKey);
  dbg(51,"PC %s %s ",address_to_str(&pinfo->src), address_to_str(&pinfo->dst)); 
  dbg(51,"Tid %lx %lx ",tcaphash_cont_key.src_tid, tcaphash_cont_key.dst_tid);
#endif
  p_tcaphash_contcall = find_tcaphash_cont(&tcaphash_cont_key, pinfo);
  if(p_tcaphash_contcall) {
#ifdef DEBUG_TCAPSRT
    dbg(12,"CFound ");
#endif
    p_tcaphash_context=p_tcaphash_contcall->context;
  } else { /* Not found */
#ifdef DEBUG_TCAPSRT
    dbg(12,"CnotFound ");
#endif
    struct tcaphash_begin_info_key_t tcaphash_begin_key;
    struct tcaphash_begincall_t *p_tcaphash_begincall;

    struct tcaphash_end_info_key_t tcaphash_end_key;
    struct tcaphash_endcall_t *p_tcaphash_endcall;

    tcaphash_begin_key.tid = p_tcapsrt_info->dst_tid;
    tcaphash_begin_key.opc_hash=mtp3_pc_hash( ((address*)(&pinfo->src))->data);
    tcaphash_begin_key.dpc_hash=mtp3_pc_hash( ((address*)(&pinfo->dst))->data);
    tcaphash_begin_key.hashKey=tcaphash_begin_calchash(&tcaphash_begin_key);

#ifdef DEBUG_TCAPSRT
    dbg(11,"Bkey %lx ", tcaphash_begin_key.hashKey);
    dbg(51,"PC %s %s ",address_to_str(&pinfo->src), address_to_str(&pinfo->dst)); 
    dbg(51,"Tid %lx ",tcaphash_begin_key.tid);
#endif
    p_tcaphash_begincall = find_tcaphash_begin(&tcaphash_begin_key, pinfo,FALSE);
    if(p_tcaphash_begincall &&
       !p_tcaphash_begincall->context->contcall ) {
#ifdef DEBUG_TCAPSRT
      dbg(12,"BFound ");
#endif	
      p_tcaphash_context=p_tcaphash_begincall->context;
      p_tcaphash_context->responded=TRUE;

#ifdef DEBUG_TCAPSRT
      dbg(10,"New Ckey %lx ",tcaphash_cont_key.hashKey);
#endif
      p_tcaphash_contcall = create_tcaphash_cont(&tcaphash_cont_key,
						 p_tcaphash_begincall->context);
      
#ifdef DEBUG_TCAPSRT
      dbg(11,"Update Ckey %lx ",tcaphash_begin_key.hashKey);
      dbg(11,"Frame reqlink #%d ", pinfo->fd->num);
#endif
      tcaphash_end_key.tid = p_tcapsrt_info->src_tid;
      tcaphash_end_key.opc_hash=mtp3_pc_hash( ((address*)(&pinfo->src))->data);
      tcaphash_end_key.dpc_hash=mtp3_pc_hash( ((address*)(&pinfo->dst))->data);
      tcaphash_end_key.hashKey=tcaphash_end_calchash(&tcaphash_end_key);

#ifdef DEBUG_TCAPSRT
      dbg(10,"New Ekey %lx ",tcaphash_end_key.hashKey);
#endif
      p_tcaphash_endcall = create_tcaphash_end(&tcaphash_end_key,
					       p_tcaphash_begincall->context);
      
#ifdef DEBUG_TCAPSRT
      dbg(11,"Update Ekey %lx ",tcaphash_end_key.hashKey);
      dbg(11,"Frame reqlink #%d ", pinfo->fd->num);
#endif
    } else { /* Begin not found */
#ifdef DEBUG_TCAPSRT
      dbg(12,"BnotFound ");
#endif 
    } /* begin found */
  } /* cont found */
    /* display tcap session, if available */
  if (gtcap_DisplaySRT &&
      p_tcaphash_context &&
      p_tcaphash_context->session_id)
    proto_tree_add_uint(tree, hf_tcapsrt_SessionId, tvb, 0,0, p_tcaphash_context->session_id);
  
  return p_tcaphash_context;
}



/*
 *
 *
 */
static struct tcaphash_context_t *
tcaphash_end_matching(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
		      struct tcapsrt_info_t *p_tcapsrt_info)
{  
  struct tcaphash_context_t *p_tcaphash_context=NULL;

  struct tcaphash_end_info_key_t tcaphash_end_key;
  struct tcaphash_endcall_t *p_tcaphash_endcall=NULL;

  struct tcaphash_begin_info_key_t tcaphash_begin_key;
  struct tcaphash_begincall_t *p_tcaphash_begincall=NULL; 
  proto_item *ti; 
  nstime_t delta;


#ifdef DEBUG_TCAPSRT
  dbg(10,"\n Hend #%d ", pinfo->fd->num);
#endif
  /* look only for matching request, if matching conversation is available. */
  tcaphash_end_key.tid = p_tcapsrt_info->dst_tid;
  tcaphash_end_key.opc_hash = mtp3_pc_hash( ((address*)(&pinfo->src))->data);
  tcaphash_end_key.dpc_hash = mtp3_pc_hash( ((address*)(&pinfo->dst))->data);
  tcaphash_end_key.hashKey=tcaphash_end_calchash(&tcaphash_end_key);

#ifdef DEBUG_TCAPSRT
  dbg(11,"Ekey %lx ",tcaphash_end_key.hashKey);
  dbg(11,"PC %s %s ",address_to_str(&pinfo->src), address_to_str(&pinfo->dst)); 
  dbg(51,"Tid %lx ",tcaphash_end_key.tid);
#endif
  p_tcaphash_endcall = find_tcaphash_end(&tcaphash_end_key, pinfo,TRUE);
  
  if(!p_tcaphash_endcall) {
#ifdef DEBUG_TCAPSRT
    dbg(12,"EnotFound "); 
#endif   
    tcaphash_begin_key.tid = p_tcapsrt_info->dst_tid;
    tcaphash_begin_key.opc_hash=mtp3_pc_hash( ((address*)(&pinfo->src))->data);
    tcaphash_begin_key.dpc_hash=mtp3_pc_hash( ((address*)(&pinfo->dst))->data);
    tcaphash_begin_key.hashKey=tcaphash_begin_calchash(&tcaphash_begin_key);
    
#ifdef DEBUG_TCAPSRT
    dbg(11,"Bkey %lx ", tcaphash_begin_key.hashKey);
    dbg(51,"PC %s %s ",address_to_str(&pinfo->src), address_to_str(&pinfo->dst)); 
    dbg(51,"Tid %lx ",tcaphash_begin_key.tid);
#endif
    p_tcaphash_begincall = find_tcaphash_begin(&tcaphash_begin_key, pinfo,FALSE);
  }
  
  if (p_tcaphash_endcall) {
    /* Use the TC_BEGIN Destination reference */
    p_tcaphash_context=p_tcaphash_endcall->context;
  } else if (p_tcaphash_begincall) {
    /* Use the TC_BEGIN Source reference */ 
    p_tcaphash_context=p_tcaphash_begincall->context;
  }

  if (p_tcaphash_context) {
    
#ifdef DEBUG_TCAPSRT
    dbg(12,"Found, req=%d ",p_tcaphash_context->first_frame);
#endif
    if (gtcap_DisplaySRT)
      proto_tree_add_uint(tree, hf_tcapsrt_SessionId, tvb, 0,0, p_tcaphash_context->session_id);

#ifdef DEBUG_TCAPSRT
    dbg(20,"Display framereqlink %d ",p_tcaphash_context->first_frame);
#endif
    /* Indicate the frame to which this is a reply. */
    if (gtcap_DisplaySRT) {
      ti = proto_tree_add_uint_format(tree, hf_tcapsrt_EndSession, tvb, 0, 0,
				      p_tcaphash_context->first_frame,
				      "Begin of session in frame %u",
				      p_tcaphash_context->first_frame);
      PROTO_ITEM_SET_GENERATED(ti);
      /* Calculate Service Response Time */
      nstime_delta(&delta, &pinfo->fd->abs_ts, &p_tcaphash_context->begin_time);
      
      /* display Service Response Time and make it filterable */
      ti = proto_tree_add_time(tree, hf_tcapsrt_SessionTime, tvb, 0, 0, &delta);
      PROTO_ITEM_SET_GENERATED(ti);
    }
    /* Close the context and remove it */
    tcapsrt_close(p_tcaphash_context,pinfo);

  } /* context present */ 
  return p_tcaphash_context;
}

/*
 * Initialize the Message Info used by the main dissector
 * Data are linked to a TCAP transaction 
 */
struct tcapsrt_info_t *
tcapsrt_razinfo(void)
{
  struct tcapsrt_info_t *p_tcapsrt_info ;

  /* Global buffer for packet extraction */
  tcapsrt_global_current++;
  if(tcapsrt_global_current==MAX_TCAP_INSTANCE){
    tcapsrt_global_current=0;
  }
  
  p_tcapsrt_info=&tcapsrt_global_info[tcapsrt_global_current];
  memset(p_tcapsrt_info,0,sizeof(struct tcapsrt_info_t));  

  return p_tcapsrt_info;
}

void
tcapsrt_close(struct tcaphash_context_t *p_tcaphash_context,
	      packet_info *pinfo)
{
#ifdef DEBUG_TCAPSRT
  dbg(60,"Force close ");
#endif
  if (p_tcaphash_context) {
    p_tcaphash_context->responded=TRUE;
    p_tcaphash_context->last_frame = pinfo->fd->num;
    p_tcaphash_context->end_time = pinfo->fd->abs_ts;
    p_tcaphash_context->closed=TRUE;

    /* If the endkey is present */
    if ( p_tcaphash_context->endcall
	 && !gtcap_PersistentSRT ) {
#ifdef DEBUG_TCAPSRT
      dbg(20,"remove Ehash ");
#endif
      g_hash_table_remove(tcaphash_end, p_tcaphash_context->endcall->endkey);
    }
    
    /* If the contkey is present */
    if ( p_tcaphash_context->contcall
	 && !gtcap_PersistentSRT) {
#ifdef DEBUG_TCAPSRT
      dbg(20,"remove Chash ");
#endif
      g_hash_table_remove(tcaphash_cont, p_tcaphash_context->contcall->contkey);
    }
    
    /* If the beginkey is present */
    if (p_tcaphash_context->begincall->next_begincall) {
      if (p_tcaphash_context->begincall->previous_begincall ) {
#ifdef DEBUG_TCAPSRT
	dbg(20,"deplace Bhash ");
#endif
	p_tcaphash_context->begincall->previous_begincall->next_begincall
	  = p_tcaphash_context->begincall->next_begincall;
	p_tcaphash_context->begincall->next_begincall->previous_begincall
	  = p_tcaphash_context->begincall->previous_begincall;
      } else {
	/* cannot remove the father */
#ifdef DEBUG_TCAPSRT
	dbg(20,"father Bhash ");
#endif
      }
    } else  if (!gtcap_PersistentSRT) {
#ifdef DEBUG_TCAPSRT
      dbg(20,"remove Bhash ");
#endif
      g_hash_table_remove(tcaphash_begin, p_tcaphash_context->begincall->beginkey);
#ifdef DEBUG_TCAPSRT
      dbg(20,"remove context ");
#endif
      g_hash_table_remove(tcaphash_context, p_tcaphash_context->key);
      
    } /* begincall without chained string */
  } else { /* no context */
#ifdef DEBUG_TCAPSRT
    dbg(20,"No context to remove ");
#endif
  }
}