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packet-ctdb.c

/* packet-ctdb.c
 * Routines for CTDB (Cluster TDB) dissection
 * Copyright 2007, Ronnie Sahlberg
 *
 * $Id: packet-ctdb.c 22035 2007-06-04 07:35:05Z sahlberg $
 *
 * 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <glib.h>

#include <epan/packet.h>
#include <epan/prefs.h>
#include <epan/value_string.h>
#include <epan/conversation.h>
#include <epan/emem.h>

/* Initialize the protocol and registered fields */
static int proto_ctdb = -1;
static int hf_ctdb_length = -1;
static int hf_ctdb_opcode = -1;
static int hf_ctdb_magic = -1;
static int hf_ctdb_version = -1;
static int hf_ctdb_dst = -1;
static int hf_ctdb_src = -1;
static int hf_ctdb_id = -1;
static int hf_ctdb_flags_immediate = -1;
static int hf_ctdb_dbid = -1;
static int hf_ctdb_callid = -1;
static int hf_ctdb_status = -1;
static int hf_ctdb_keylen = -1;
static int hf_ctdb_datalen = -1;
static int hf_ctdb_key = -1;
static int hf_ctdb_keyhash = -1;
static int hf_ctdb_data = -1;
static int hf_ctdb_dmaster = -1;
static int hf_ctdb_request_in = -1;
static int hf_ctdb_response_in = -1;
static int hf_ctdb_time = -1;
static int hf_ctdb_xid = -1;
static int hf_ctdb_generation = -1;
static int hf_ctdb_hopcount = -1;
static int hf_ctdb_rsn = -1;
static int hf_ctdb_ctrl_opcode = -1;
static int hf_ctdb_srvid = -1;
static int hf_ctdb_clientid = -1;
static int hf_ctdb_ctrl_flags = -1;

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

/* this tree keeps track of caller/reqid for ctdb transactions */
emem_tree_t *ctdb_transactions=NULL;
typedef struct _ctdb_trans_t {
      guint32 key_hash;
      gint32 request_in;
      gint32 response_in;
      nstime_t req_time;
} ctdb_trans_t;


#define CTDB_REQ_CALL               0
#define CTDB_REPLY_CALL             1
#define CTDB_REQ_DMASTER            2
#define CTDB_REPLY_DMASTER          3
#define CTDB_REPLY_ERROR            4
#define CTDB_REQ_MESSAGE            5
#define CTDB_REQ_CONTROL            7
#define CTDB_REPLY_CONTROL          8
#define CTDB_REQ_KEEPALIVE          9
static const value_string ctdb_opcodes[] = {
      {CTDB_REQ_CALL,         "CTDB_REQ_CALL"},
      {CTDB_REPLY_CALL,       "CTDB_REPLY_CALL"},
      {CTDB_REQ_DMASTER,            "CTDB_REQ_DMASTER"},
      {CTDB_REPLY_DMASTER,          "CTDB_REPLY_DMASTER"},
      {CTDB_REPLY_ERROR,            "CTDB_REPLY_ERROR"},
      {CTDB_REQ_MESSAGE,            "CTDB_REQ_MESSAGE"},
      {CTDB_REQ_CONTROL,            "CTDB_REQ_CONTROL"},
      {CTDB_REPLY_CONTROL,          "CTDB_REPLY_CONTROL"},
      {CTDB_REQ_KEEPALIVE,          "CTDB_REQ_KEEPALIVE"},
      {0,NULL}
};


#define CTDB_CONTROL_PROCESS_EXISTS       0
#define CTDB_CONTROL_STATISTICS                 1
#define CTDB_CONTROL_CONFIG               2
#define CTDB_CONTROL_PING                 3
#define CTDB_CONTROL_GETDBPATH                  4
#define CTDB_CONTROL_GETVNNMAP                  5
#define CTDB_CONTROL_SETVNNMAP                  6
#define CTDB_CONTROL_GET_DEBUG                  7
#define CTDB_CONTROL_SET_DEBUG                  8
#define CTDB_CONTROL_GET_DBMAP                  9
#define CTDB_CONTROL_GET_NODEMAP          10
#define CTDB_CONTROL_SET_DMASTER          11
#define CTDB_CONTROL_CLEAR_DB             12
#define CTDB_CONTROL_PULL_DB              13
#define CTDB_CONTROL_PUSH_DB              14
#define CTDB_CONTROL_GET_RECMODE          15
#define CTDB_CONTROL_SET_RECMODE          16
#define CTDB_CONTROL_STATISTICS_RESET           17
#define CTDB_CONTROL_DB_ATTACH                  18
#define CTDB_CONTROL_SET_CALL             19
#define CTDB_CONTROL_TRAVERSE_START       20
#define CTDB_CONTROL_TRAVERSE_ALL         21
#define CTDB_CONTROL_TRAVERSE_DATA        22
#define CTDB_CONTROL_REGISTER_SRVID       23
#define CTDB_CONTROL_DEREGISTER_SRVID           24
#define CTDB_CONTROL_GET_DBNAME                 25
#define CTDB_CONTROL_ENABLE_SEQNUM        26
#define CTDB_CONTROL_UPDATE_SEQNUM        27
#define CTDB_CONTROL_SET_SEQNUM_FREQUENCY 28
#define CTDB_CONTROL_DUMP_MEMORY          29
#define CTDB_CONTROL_GET_PID              30
#define CTDB_CONTROL_GET_RECMASTER        31
#define CTDB_CONTROL_SET_RECMASTER        32
#define CTDB_CONTROL_FREEZE               33
#define CTDB_CONTROL_THAW                 34
#define CTDB_CONTROL_GET_VNN              35
#define CTDB_CONTROL_SHUTDOWN             36
#define CTDB_CONTROL_GET_MONMODE          37
#define CTDB_CONTROL_SET_MONMODE          38
#define CTDB_CONTROL_MAX_RSN              39
#define CTDB_CONTROL_SET_RSN_NONEMPTY           40
#define CTDB_CONTROL_DELETE_LOW_RSN       41
#define CTDB_CONTROL_TAKEOVER_IP          42
#define CTDB_CONTROL_RELEASE_IP                 43
#define CTDB_CONTROL_TCP_CLIENT                 44
#define CTDB_CONTROL_TCP_ADD              45
#define CTDB_CONTROL_TCP_REMOVE                 46
#define CTDB_CONTROL_STARTUP              47

static const value_string ctrl_opcode_vals[] = {
      {CTDB_CONTROL_PROCESS_EXISTS, "PROCESS_EXISTS"},
      {CTDB_CONTROL_STATISTICS,     "STATISTICS"},
      {CTDB_CONTROL_CONFIG,         "CONFIG"},
      {CTDB_CONTROL_PING,           "PING"},
      {CTDB_CONTROL_GETDBPATH,      "GETDBPATH"},
      {CTDB_CONTROL_GETVNNMAP,      "GETVNNMAP"},
      {CTDB_CONTROL_SETVNNMAP,      "SETVNNMAP"},
      {CTDB_CONTROL_GET_DEBUG,      "GET_DEBUG"},
      {CTDB_CONTROL_SET_DEBUG,      "SET_DEBUG"},
      {CTDB_CONTROL_GET_DBMAP,      "GET_DBMAP"},
      {CTDB_CONTROL_GET_NODEMAP,    "GET_NODEMAP"},
      {CTDB_CONTROL_SET_DMASTER,    "SET_DMASTER"},
      {CTDB_CONTROL_CLEAR_DB,       "CLEAR_DB"},
      {CTDB_CONTROL_PULL_DB,        "PULL_DB"},
      {CTDB_CONTROL_PUSH_DB,        "PUSH_DB"},
      {CTDB_CONTROL_GET_RECMODE,    "GET_RECMODE"},
      {CTDB_CONTROL_SET_RECMODE,    "SET_RECMODE"},
      {CTDB_CONTROL_STATISTICS_RESET,     "STATISTICS_RESET"},
      {CTDB_CONTROL_DB_ATTACH,      "DB_ATTACH"},
      {CTDB_CONTROL_SET_CALL,       "SET_CALL"},
      {CTDB_CONTROL_TRAVERSE_START, "TRAVERSE_START"},
      {CTDB_CONTROL_TRAVERSE_ALL,   "TRAVERSE_ALL"},
      {CTDB_CONTROL_TRAVERSE_DATA,  "TRAVERSE_DATA"},
      {CTDB_CONTROL_REGISTER_SRVID, "REGISTER_SRVID"},
      {CTDB_CONTROL_DEREGISTER_SRVID,     "DEREGISTER_SRVID"},
      {CTDB_CONTROL_GET_DBNAME,     "GET_DBNAME"},
      {CTDB_CONTROL_ENABLE_SEQNUM,  "ENABLE_SEQNUM"},
      {CTDB_CONTROL_UPDATE_SEQNUM,  "UPDATE_SEQNUM"},
      {CTDB_CONTROL_SET_SEQNUM_FREQUENCY, "SET_SEQNUM_FREQUENCY"},
      {CTDB_CONTROL_DUMP_MEMORY,    "DUMP_MEMORY"},
      {CTDB_CONTROL_GET_PID,        "GET_PID"},
      {CTDB_CONTROL_GET_RECMASTER,  "GET_RECMASTER"},
      {CTDB_CONTROL_SET_RECMASTER,  "SET_RECMASTER"},
      {CTDB_CONTROL_FREEZE,         "FREEZE"},
      {CTDB_CONTROL_THAW,           "THAW"},
      {CTDB_CONTROL_GET_VNN,        "GET_VNN"},
      {CTDB_CONTROL_SHUTDOWN,       "SHUTDOWN"},
      {CTDB_CONTROL_GET_MONMODE,    "GET_MONMODE"},
      {CTDB_CONTROL_SET_MONMODE,    "SET_MONMODE"},
      {CTDB_CONTROL_MAX_RSN,        "MAX_RSN"},
      {CTDB_CONTROL_SET_RSN_NONEMPTY,     "SET_RSN_NONEMPTY"},
      {CTDB_CONTROL_DELETE_LOW_RSN, "DELETE_LOW_RSN"},
      {CTDB_CONTROL_TAKEOVER_IP,    "TAKEOVER_IP"},
      {CTDB_CONTROL_RELEASE_IP,     "RELEASE_IP"},
      {CTDB_CONTROL_TCP_CLIENT,     "TCP_CLIENT"},
      {CTDB_CONTROL_TCP_ADD,        "TCP_ADD"},
      {CTDB_CONTROL_TCP_REMOVE,     "TCP_REMOVE"},
      {CTDB_CONTROL_STARTUP,        "STARTUP"},
      {0, NULL}
};

static const value_string ctdb_dbid_vals[] = {
      {0x435d3410,            "notify.tdb"},
      {0x42fe72c5,            "locking.tdb"},
      {0x1421fb78,            "brlock.tdb"},
      {0x17055d90,            "connections.tdb"},
      {0xc0bdde6a,            "sessionid.tdb"},
      {0, NULL}
};

static void
ctdb_display_trans(packet_info *pinfo, proto_tree *tree, tvbuff_t *tvb, ctdb_trans_t *ctdb_trans)
{
      proto_item *item;

      item=proto_tree_add_uint(tree, hf_ctdb_xid, tvb, 0, 0, (int)ctdb_trans);
      PROTO_ITEM_SET_GENERATED(item);

      if(ctdb_trans->request_in!=(gint32)pinfo->fd->num){
            item=proto_tree_add_uint(tree, hf_ctdb_request_in, tvb, 0, 0, ctdb_trans->request_in);
            PROTO_ITEM_SET_GENERATED(item);
      }

      if( (ctdb_trans->response_in!=-1)
        &&(ctdb_trans->response_in!=(gint32)pinfo->fd->num) ){
            item=proto_tree_add_uint(tree, hf_ctdb_response_in, tvb, 0, 0, ctdb_trans->response_in);
            PROTO_ITEM_SET_GENERATED(item);
      }

      if((gint32)pinfo->fd->num==ctdb_trans->response_in){
            nstime_t ns;

            nstime_delta(&ns, &pinfo->fd->abs_ts, &ctdb_trans->req_time);
            item=proto_tree_add_time(tree, hf_ctdb_time, tvb, 0, 0, &ns);
            PROTO_ITEM_SET_GENERATED(item);
      }
}

static guint32
ctdb_hash(tvbuff_t *tvb, int offset, guint32 len)
{
      guint32 value;
      guint32 i;

      for(value=0x238F13AF*len, i=0; i < len; i++)
            value=(value+(tvb_get_guint8(tvb, offset+i) << (i*5 % 24)));

      return (1103515243 * value + 12345);  
}

static int
dissect_ctdb_key(proto_tree *tree, tvbuff_t *tvb, int offset, guint32 keylen, guint32 *key_hash, int endianess)
{
      guint32 keyhash;
      proto_item *key_item=NULL;
      proto_item *key_tree=NULL;

      if(tree){
            key_item=proto_tree_add_item(tree, hf_ctdb_key, tvb, offset, keylen, endianess);
            key_tree=proto_item_add_subtree(key_item, ett_ctdb_key);

      }

      keyhash=ctdb_hash(tvb, offset, keylen);
      proto_item_append_text(key_item, " (Hash:0x%08x)", keyhash);
      key_item=proto_tree_add_uint(key_tree, hf_ctdb_keyhash, tvb, 0, 0, keyhash);
      PROTO_ITEM_SET_GENERATED(key_item);

      offset+=keylen;

      if(key_hash){
            *key_hash=keyhash;
      }

      return offset;
}

static int
dissect_ctdb_reply_call(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, int endianess)
{
      guint32 datalen;

      /* status */
      proto_tree_add_item(tree, hf_ctdb_status, tvb, offset, 4, endianess);
      offset+=4;

      /* datalen */
      proto_tree_add_item(tree, hf_ctdb_datalen, tvb, offset, 4, endianess);
      if(endianess){
            datalen=tvb_get_letohl(tvb, offset);
      } else {
            datalen=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* data */
      proto_tree_add_item(tree, hf_ctdb_data, tvb, offset, datalen, endianess);
      offset+=datalen;
      

      return offset;
}

static int
dissect_ctdb_reply_dmaster(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, guint32 reqid, guint32 dst, int endianess)
{
      guint32 datalen, keylen;
      emem_tree_key_t tkey[3];
      ctdb_trans_t *ctdb_trans;

      /* dbid */
      proto_tree_add_item(tree, hf_ctdb_dbid, tvb, offset, 4, endianess);
      offset+=4;


      /* rsn */
      offset=(offset+7)&0xfffff8; /* fixup alignment*/
      proto_tree_add_item(tree, hf_ctdb_rsn, tvb, offset, 8, endianess);
      offset+=8;

      /* keylen */
      proto_tree_add_item(tree, hf_ctdb_keylen, tvb, offset, 4, endianess);
      if(endianess){
            keylen=tvb_get_letohl(tvb, offset);
      } else {
            keylen=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* datalen */
      proto_tree_add_item(tree, hf_ctdb_datalen, tvb, offset, 4, endianess);
      if(endianess){
            datalen=tvb_get_letohl(tvb, offset);
      } else {
            datalen=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* key */
      offset=dissect_ctdb_key(tree, tvb, offset, keylen, NULL, endianess);

      /* data */
      proto_tree_add_item(tree, hf_ctdb_data, tvb, offset, datalen, endianess);
      offset+=datalen;
      
      tkey[0].length=1;
      tkey[0].key=&reqid;
      tkey[1].length=1;
      tkey[1].key=&dst;
      tkey[2].length=0;
      ctdb_trans=se_tree_lookup32_array(ctdb_transactions, &tkey[0]);

      if(ctdb_trans){
            ctdb_trans->response_in=pinfo->fd->num;
            ctdb_display_trans(pinfo, tree, tvb, ctdb_trans);
      }

      return offset;
}

static int
dissect_ctdb_req_dmaster(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, guint32 reqid, int endianess)
{
      guint32 keylen, datalen, dmaster;
      emem_tree_key_t tkey[3];
      ctdb_trans_t *ctdb_trans;

      /* dbid */
      proto_tree_add_item(tree, hf_ctdb_dbid, tvb, offset, 4, endianess);
      offset+=4;

      /* rsn */
      offset=(offset+7)&0xfffff8; /* fixup alignment*/
      proto_tree_add_item(tree, hf_ctdb_rsn, tvb, offset, 8, endianess);
      offset+=8;

      /* dmaster */
      proto_tree_add_item(tree, hf_ctdb_dmaster, tvb, offset, 4, endianess);
      if(endianess){
            dmaster=tvb_get_letohl(tvb, offset);
      } else {
            dmaster=tvb_get_ntohl(tvb, offset);
      }
      offset += 4;

      /* keylen */
      proto_tree_add_item(tree, hf_ctdb_keylen, tvb, offset, 4, endianess);
      if(endianess){
            keylen=tvb_get_letohl(tvb, offset);
      } else {
            keylen=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* datalen */
      proto_tree_add_item(tree, hf_ctdb_datalen, tvb, offset, 4, endianess);
      if(endianess){
            datalen=tvb_get_letohl(tvb, offset);
      } else {
            datalen=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* key */
      offset=dissect_ctdb_key(tree, tvb, offset, keylen, NULL, endianess);

      /* data */
      proto_tree_add_item(tree, hf_ctdb_data, tvb, offset, datalen, endianess);
      offset+=datalen;


      tkey[0].length=1;
      tkey[0].key=&reqid;
      tkey[1].length=1;
      tkey[1].key=&dmaster;
      tkey[2].length=0;
      ctdb_trans=se_tree_lookup32_array(ctdb_transactions, &tkey[0]);

      if(ctdb_trans){
            ctdb_display_trans(pinfo, tree, tvb, ctdb_trans);
      }

      return offset;
}



static int
dissect_ctdb_req_control(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree, guint32 reqid _U_, int endianess)
{
      guint32 datalen;
      guint32 opcode;

      /* ctrl opcode */
      proto_tree_add_item(tree, hf_ctdb_ctrl_opcode, tvb, offset, 4, endianess);
      if(endianess){
            opcode=tvb_get_letohl(tvb, offset);
      } else {
            opcode=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      if(check_col(pinfo->cinfo, COL_INFO)){
            col_append_fstr(pinfo->cinfo, COL_INFO, "  %s",
                  val_to_str(opcode, ctrl_opcode_vals, "Unknown:%d"));
      }

      /* srvid */
      offset=(offset+7)&0xfffff8; /* fixup alignment*/
      proto_tree_add_item(tree, hf_ctdb_srvid, tvb, offset, 8, endianess);
      offset+=8;

      /* client id */
      proto_tree_add_item(tree, hf_ctdb_clientid, tvb, offset, 4, endianess);
      offset+=4;

      /* ctrl flags */
      proto_tree_add_item(tree, hf_ctdb_ctrl_flags, tvb, offset, 4, endianess);
      offset+=4;

      /* datalen */
      proto_tree_add_item(tree, hf_ctdb_datalen, tvb, offset, 4, endianess);
      if(endianess){
            datalen=tvb_get_letohl(tvb, offset);
      } else {
            datalen=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* data */
      proto_tree_add_item(tree, hf_ctdb_data, tvb, offset, datalen, endianess);
      offset+=datalen;
      
      return offset;
}

static const true_false_string flags_immediate_tfs={
      "DMASTER for the record must IMMEDIATELY be migrated to the caller",
      "Dmaster migration is not required"
};

static int
dissect_ctdb_req_call(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, guint32 reqid, guint32 caller, int endianess)
{
      guint32 flags, keyhash;
      guint32 keylen, datalen;
      ctdb_trans_t *ctdb_trans=NULL;

      /* flags */
      proto_tree_add_item(tree, hf_ctdb_flags_immediate, tvb, offset, 4, endianess);
      if(endianess){
            flags=tvb_get_letohl(tvb, offset);
      } else {
            flags=tvb_get_ntohl(tvb, offset);
      }
      if(flags&0x00000001){
            if(check_col(pinfo->cinfo, COL_INFO)){
                  col_append_fstr(pinfo->cinfo, COL_INFO, " IMMEDIATE");
            }
      }     
      offset+=4;

      /* dbid */
      proto_tree_add_item(tree, hf_ctdb_dbid, tvb, offset, 4, endianess);
      offset+=4;

      /* callid */
      proto_tree_add_item(tree, hf_ctdb_callid, tvb, offset, 4, endianess);
      offset+=4;

      /* hopcount */
      proto_tree_add_item(tree, hf_ctdb_hopcount, tvb, offset, 4, endianess);
      offset+=4;

      /* keylen */
      proto_tree_add_item(tree, hf_ctdb_keylen, tvb, offset, 4, endianess);
      if(endianess){
            keylen=tvb_get_letohl(tvb, offset);
      } else {
            keylen=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* datalen */
      proto_tree_add_item(tree, hf_ctdb_datalen, tvb, offset, 4, endianess);
      if(endianess){
            datalen=tvb_get_letohl(tvb, offset);
      } else {
            datalen=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* key */
      offset=dissect_ctdb_key(tree, tvb, offset, keylen, &keyhash, endianess);

      /* data */
      proto_tree_add_item(tree, hf_ctdb_data, tvb, offset, datalen, endianess);
      offset+=datalen;

      /* setup request/response matching */
      if(!pinfo->fd->flags.visited){
            emem_tree_key_t tkey[3];

            ctdb_trans=se_alloc(sizeof(ctdb_trans_t));
            ctdb_trans->key_hash=keyhash;
            ctdb_trans->request_in=pinfo->fd->num;
            ctdb_trans->response_in=-1;
            ctdb_trans->req_time=pinfo->fd->abs_ts;
            tkey[0].length=1;
            tkey[0].key=&reqid;
            tkey[1].length=1;
            tkey[1].key=&caller;
            tkey[2].length=0;

            se_tree_insert32_array(ctdb_transactions, &tkey[0], ctdb_trans);
      } else {
            emem_tree_key_t tkey[3];

            tkey[0].length=1;
            tkey[0].key=&reqid;
            tkey[1].length=1;
            tkey[1].key=&caller;
            tkey[2].length=0;
            ctdb_trans=se_tree_lookup32_array(ctdb_transactions, &tkey[0]);
      }

      if(ctdb_trans){
            ctdb_display_trans(pinfo, tree, tvb, ctdb_trans);
      }

      return offset;
}

static gboolean
dissect_ctdb(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
{
      proto_tree *tree=NULL;
      proto_item *item=NULL;
      int offset=0;
      guint32 opcode, src, dst, reqid;
      int endianess;

      /* does this look like CTDB? */
      if(tvb_length_remaining(tvb, offset)<8){
            return FALSE;
      }
      switch(tvb_get_letohl(tvb, offset+4)){
      case 0x42445443:
            endianess=FALSE;
            break;
      case 0x43544442:
            endianess=TRUE;
            break;
      default:
            return FALSE;
      }
      

      if(check_col(pinfo->cinfo, COL_PROTOCOL)){
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "CTDB");
      }
      if(check_col(pinfo->cinfo, COL_INFO)){
            col_clear(pinfo->cinfo, COL_INFO);
      }

      if(parent_tree){
            item=proto_tree_add_item(parent_tree, proto_ctdb, tvb, offset,
                  -1, endianess);
            tree=proto_item_add_subtree(item, ett_ctdb);
      }

      /* header*/
      /* length */
      proto_tree_add_item(tree, hf_ctdb_length, tvb, offset, 4, endianess);
      offset+=4;

      /* magic */
      proto_tree_add_item(tree, hf_ctdb_magic, tvb, offset, 4, endianess);
      offset+=4;

      /* version */
      proto_tree_add_item(tree, hf_ctdb_version, tvb, offset, 4, endianess);
      offset+=4;

      /* generation */
      proto_tree_add_item(tree, hf_ctdb_generation, tvb, offset, 4, endianess);
      offset+=4;

      /* opcode */
      proto_tree_add_item(tree, hf_ctdb_opcode, tvb, offset, 4, endianess);
      if(endianess){
            opcode=tvb_get_letohl(tvb, offset);
      } else {
            opcode=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* dst */
      proto_tree_add_item(tree, hf_ctdb_dst, tvb, offset, 4, endianess);
      if(endianess){
            dst=tvb_get_letohl(tvb, offset);
      } else {
            dst=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* src */
      proto_tree_add_item(tree, hf_ctdb_src, tvb, offset, 4, endianess);
      if(endianess){
            src=tvb_get_letohl(tvb, offset);
      } else {
            src=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      /* id */
      proto_tree_add_item(tree, hf_ctdb_id, tvb, offset, 4, endianess);
      if(endianess){
            reqid=tvb_get_letohl(tvb, offset);
      } else {
            reqid=tvb_get_ntohl(tvb, offset);
      }
      offset+=4;

      if(check_col(pinfo->cinfo, COL_INFO)){
            col_append_fstr(pinfo->cinfo, COL_INFO, "%s %d->%d",
                  val_to_str(opcode, ctdb_opcodes, "Unknown:%d"),
                  src, dst);
      }

      switch(opcode){
      case CTDB_REQ_CALL:
            offset=dissect_ctdb_req_call(tvb, offset, pinfo, tree, reqid, src, endianess);
            break;
      case CTDB_REPLY_CALL:
            offset=dissect_ctdb_reply_call(tvb, offset, pinfo, tree, endianess);
            break;
      case CTDB_REPLY_DMASTER:
            offset=dissect_ctdb_reply_dmaster(tvb, offset, pinfo, tree, reqid, dst, endianess);
            break;
      case CTDB_REQ_DMASTER:
            offset=dissect_ctdb_req_dmaster(tvb, offset, pinfo, tree, reqid, endianess);
            break;
      case CTDB_REPLY_ERROR:
            break;
      case CTDB_REQ_MESSAGE:
            break;
      case CTDB_REQ_CONTROL:
            offset=dissect_ctdb_req_control(tvb, offset, pinfo, tree, reqid, endianess);
            break;
      case CTDB_REPLY_CONTROL:
            break;
      };

      return TRUE;
}


/*
 * Register the protocol with Wireshark
 */
void
proto_register_ctdb(void)
{
      static hf_register_info hf[] = {
      { &hf_ctdb_length, { 
        "Length", "ctdb.len", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "Size of CTDB PDU", HFILL }},
      { &hf_ctdb_dst, { 
        "Destination", "ctdb.dst", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_src, { 
        "Source", "ctdb.src", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_id, { 
        "Id", "ctdb.id", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "Transaction ID", HFILL }},
      { &hf_ctdb_opcode, { 
        "Opcode", "ctdb.opcode", FT_UINT32, BASE_DEC, 
        VALS(ctdb_opcodes), 0x0, "CTDB command opcode", HFILL }},
      { &hf_ctdb_flags_immediate, { 
        "Immediate", "ctdb.immediate", FT_BOOLEAN, 32, 
        TFS(&flags_immediate_tfs), 0x00000001, "Force migration of DMASTER?", HFILL }},
      { &hf_ctdb_dbid, { 
        "DB Id", "ctdb.dbid", FT_UINT32, BASE_HEX, 
        VALS(ctdb_dbid_vals), 0x0, "Database ID", HFILL }},
      { &hf_ctdb_callid, { 
        "Call Id", "ctdb.callid", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "Call ID", HFILL }},
      { &hf_ctdb_status, { 
        "Status", "ctdb.status", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_datalen, { 
        "Data Length", "ctdb.datalen", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_keylen, { 
        "Key Length", "ctdb.keylen", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_magic, { 
        "Magic", "ctdb.magic", FT_UINT32, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_version, { 
        "Version", "ctdb.version", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_dmaster, { 
        "Dmaster", "ctdb.dmaster", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_generation, { 
        "Generation", "ctdb.generation", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_key, { 
        "Key", "ctdb.key", FT_BYTES, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_keyhash, { 
        "KeyHash", "ctdb.keyhash", FT_UINT32, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_data, { 
        "Data", "ctdb.data", FT_BYTES, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_request_in, { 
        "Request In", "ctdb.request_in", FT_FRAMENUM, BASE_NONE, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_response_in, { 
        "Response In", "ctdb.response_in", FT_FRAMENUM, BASE_NONE, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_time, { 
        "Time since request", "ctdb.time", FT_RELATIVE_TIME, BASE_NONE, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_xid, { 
        "xid", "ctdb.xid", FT_UINT32, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_hopcount, { 
        "Hopcount", "ctdb.hopcount", FT_UINT32, BASE_DEC, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_rsn, { 
        "RSN", "ctdb.rsn", FT_UINT64, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_ctrl_opcode, { 
        "CTRL Opcode", "ctdb.ctrl_opcode", FT_UINT32, BASE_DEC, 
        VALS(ctrl_opcode_vals), 0x0, "", HFILL }},
      { &hf_ctdb_srvid, { 
        "SrvId", "ctdb.srvid", FT_UINT64, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_clientid, { 
        "ClientId", "ctdb.clientid", FT_UINT32, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      { &hf_ctdb_ctrl_flags, { 
        "CTRL Flags", "ctdb.ctrl_flags", FT_UINT32, BASE_HEX, 
        NULL, 0x0, "", HFILL }},
      };

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

      /* Register the protocol name and description */
      proto_ctdb = proto_register_protocol("Cluster TDB", "CTDB", "ctdb");

      /* Required function calls to register the header fields and subtrees used */
      proto_register_field_array(proto_ctdb, hf, array_length(hf));
      proto_register_subtree_array(ett, array_length(ett));
}


void
proto_reg_handoff_ctdb(void)
{
      dissector_handle_t ctdb_handle;

      ctdb_handle = new_create_dissector_handle(dissect_ctdb, proto_ctdb);
      dissector_add_handle("tcp.port", ctdb_handle);

      heur_dissector_add("tcp", dissect_ctdb, proto_ctdb);

      ctdb_transactions=se_tree_create(EMEM_TREE_TYPE_RED_BLACK, "CTDB transactions tree");
}

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