Logo Search packages:      
Sourcecode: wireshark version File versions

packet-3com-njack.c

/* packet-3com-njack.c
 * Routines for the disassembly of the 3com NetworkJack management protocol
 *
 * $Id: packet-3com-njack.c 18972 2006-08-21 13:00:55Z sahlberg $
 *
 * Copyright 2005 Joerg Mayer (see AUTHORS file)
 *
 * 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.
 */

/*
  TODO:
  - Find out lots more values :-)
  - Support for other 3com devices that use the same protocol
  - Do any devices use TCP or different ports?
  - Sanity checks for tlv_length depending on tlv_type
  - Search and fix XXX comments in the code
  - Proper descriptions in hf_ fields

Specs:
      No specs available. All knowledge gained by looking at traffic dumps
      Packets to Managementstation: PORT_NJACK_PC (5264)
      Packets to Switch: PORT_NJACK_SWITCH (5265)

      Type 0x00? (localquery):        M -> BC, Magic, type, 'LOCALQUERY'?
      Type 0x01 (query):                M -> S, Magic, type, 'QUERY'
      Type 0x02 (query resp):         S -> M, Magic, type, tlv-list (end: ffxx)
      Type 0x04 ??? (after query resp): M -> S, Magic, type, 0x43AAD406
      Type 0x07 (set):                  M -> S, Magic, type, length (16 bit be)
      Type 0x08 (set resp):             S -> M, Magic, type, net length (8 bit), result status
      Type 0x0b (get):                  M -> S, Magic, type, 00 00 63 ff
      Type 0x0c (get resp):             S -> M, Magic, type, T(8 bit) L(8 bit) V(L bytes)
      Type 0x0d (dhcpinfo):             S -> M, Magic, type, tlv, t=00 = last (no length)
      Type 0x10 (clear counters):       M -> S, Magic, type, 0400
      Type 0x10 (clear counters resp):  M -> S, Magic, type, 00
 */

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

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

/* protocol handles */
static int proto_njack = -1;

/* ett handles */
static int ett_njack = -1;
static int ett_njack_tlv_header = -1;

/* hf elements */
static int hf_njack_magic = -1;
static int hf_njack_type = -1;
/* type set/get response */
static int hf_njack_tlv_length = -1;
static int hf_njack_tlv_data = -1;
static int hf_njack_tlv_version = -1;
static int hf_njack_tlv_type = -1;
static int hf_njack_tlv_typeip = -1;
static int hf_njack_tlv_devicemac = -1;
static int hf_njack_tlv_snmpwrite = -1;
static int hf_njack_tlv_dhcpcontrol = -1;
static int hf_njack_tlv_typestring = -1;
/* 1st TAB */
static int hf_njack_tlv_countermode = -1;
static int hf_njack_tlv_scheduling = -1;
static int hf_njack_tlv_addtagscheme = -1;
static int hf_njack_tlv_portingressmode = -1;
static int hf_njack_tlv_maxframesize = -1;
static int hf_njack_tlv_powerforwarding = -1;
/* type 07: set */
static int hf_njack_set_length = -1;
static int hf_njack_set_salt = -1;
static int hf_njack_set_authdata = -1;
/* type 08: set result */
static int hf_njack_setresult = -1;
/* type 0b: get */
/* type 0c: get response */
static int hf_njack_getresp_unknown1 = -1;

#define PROTO_SHORT_NAME "NJACK"
#define PROTO_LONG_NAME "3com Network Jack"

#define PORT_NJACK_PC   5264
#define PORT_NJACK_SWITCH     5265

typedef enum {
      NJACK_TYPE_QUERY  = 0x01,
      NJACK_TYPE_QUERYRESP    = 0x02,
      /* type 0x04 exists - see specs sections */
      NJACK_TYPE_SET          = 0x07,
      NJACK_TYPE_SETRESULT    = 0x08,

      NJACK_TYPE_GET          = 0x0b,
      NJACK_TYPE_GETRESP      = 0x0c,

      NJACK_TYPE_DHCPINFO     = 0x0d,

      NJACK_TYPE_CLEARCOUNTER = 0x10,
      NJACK_TYPE_COUNTERRESP  = 0x11
} njack_type_t;

static const value_string njack_type_vals[] = {
      { NJACK_TYPE_SET,       "Set"},
      { NJACK_TYPE_SETRESULT,       "Set result"},
      { NJACK_TYPE_QUERY,           "Query (discovery)"},
      { NJACK_TYPE_QUERYRESP,       "Query response"},
      { NJACK_TYPE_GET,       "Get"},
      { NJACK_TYPE_GETRESP,         "Get response"},
      { NJACK_TYPE_DHCPINFO,        "DHCP info\?\?"},
      { NJACK_TYPE_CLEARCOUNTER,    "Clear counters\?\?"},
      { NJACK_TYPE_COUNTERRESP,     "Clear counters response\?\?"},

      { 0,  NULL }
};

typedef enum {
      NJACK_CMD_STARTOFPARAMS       = 0x00,
      NJACK_CMD_MACADDRESS          = 0x01,
      NJACK_CMD_IPADDRESS           = 0x02,
      NJACK_CMD_NETWORK       = 0x03,
      NJACK_CMD_MASK                = 0x04,
      NJACK_CMD_MAXFRAMESIZE        = 0x05,
      NJACK_CMD_COUNTERMODE         = 0x06,
      NJACK_CMD_QUEUEING            = 0x0a,
      NJACK_CMD_ADDTAGSCHEME        = 0x0b,
      NJACK_CMD_REMOVETAG           = 0x0c,
      NJACK_CMD_GROUP               = 0x0d,
      NJACK_CMD_LOCATION            = 0x0e,
      NJACK_CMD_VERSION       = 0x0f,
      NJACK_CMD_PORT1               = 0x13,
      NJACK_CMD_PORT2               = 0x14,
      NJACK_CMD_PORT3               = 0x15,
      NJACK_CMD_PORT4               = 0x16,
      NJACK_CMD_PASSWORD            = 0x19,
      NJACK_CMD_ENABLESNMPWRITE     = 0x1a,
      NJACK_CMD_ROCOMMUNITY         = 0x1b,
      NJACK_CMD_RWCOMMUNITY         = 0x1c,
      NJACK_CMD_POWERFORWARDING     = 0x1e,
      NJACK_CMD_DHCPCONTROL         = 0x1f,
      NJACK_CMD_IPGATEWAY           = 0x20,
      NJACK_CMD_SNMPTRAP            = 0x23,
      NJACK_CMD_COLDSTARTTRAP       = 0x26,
      NJACK_CMD_LINKDOWNTRAP        = 0x27,
      NJACK_CMD_LINKUPTRAP          = 0x28,
      NJACK_CMD_AUTHFAILTRAP        = 0x29,
      NJACK_CMD_PRODUCTNAME         = 0x2a,
      NJACK_CMD_SERIALNO            = 0x2b,
      NJACK_CMD_GETALLPARMAMS       = 0x63,
      NJACK_CMD_ENDOFPACKET         = 0xff
} njack_cmd_type_t;

static const value_string njack_cmd_vals[] = {
      { NJACK_CMD_STARTOFPARAMS,    "Start of Parameters" },
      { NJACK_CMD_MACADDRESS,       "MAC address" },
      { NJACK_CMD_IPADDRESS,        "IP address" },
      { NJACK_CMD_NETWORK,          "IP network" },
      { NJACK_CMD_MASK,       "IP netmask" },
      { NJACK_CMD_MAXFRAMESIZE,     "Max frame size" },
      { NJACK_CMD_COUNTERMODE,      "Countermode" },
      { NJACK_CMD_QUEUEING,         "Priority scheduling policy" },
      { NJACK_CMD_ADDTAGSCHEME,     "Add tag scheme" },
      { NJACK_CMD_REMOVETAG,        "Remove tag" },
      { NJACK_CMD_GROUP,            "Device group" },
      { NJACK_CMD_LOCATION,         "Location" },
      { NJACK_CMD_VERSION,          "Firmware version" },
      { NJACK_CMD_PORT1,            "Port 1" },
      { NJACK_CMD_PORT2,            "Port 2" },
      { NJACK_CMD_PORT3,            "Port 3" },
      { NJACK_CMD_PORT4,            "Port 4" },
      { NJACK_CMD_PASSWORD,         "Device password" },
      { NJACK_CMD_ENABLESNMPWRITE,  "SNMP write enable" },
      { NJACK_CMD_ROCOMMUNITY,      "RO community" },
      { NJACK_CMD_RWCOMMUNITY,      "RW community" },
      { NJACK_CMD_POWERFORWARDING,  "Port power forwarding" },
      { NJACK_CMD_DHCPCONTROL,      "DHCP control" },
      { NJACK_CMD_IPGATEWAY,        "IP gateway" },
      { NJACK_CMD_SNMPTRAP,         "SNMP trap" },
      { NJACK_CMD_COLDSTARTTRAP,    "Coldstart trap" },
      { NJACK_CMD_LINKDOWNTRAP,     "Linkdown trap" },
      { NJACK_CMD_LINKUPTRAP,       "Linkup trap" },
      { NJACK_CMD_AUTHFAILTRAP,     "Auth fail trap" },
      { NJACK_CMD_PRODUCTNAME,      "Product name" },
      { NJACK_CMD_SERIALNO,         "Serial no" },
      { NJACK_CMD_GETALLPARMAMS,    "Get all parameters" },
      { NJACK_CMD_ENDOFPACKET,      "End of packet" },

      { 0,  NULL }
};

typedef enum {
      NJACK_SETRESULT_SUCCESS       = 0x01,
      NJACK_SETRESULT_FAILAUTH      = 0xFD
} njack_setresult_t;

static const value_string njack_setresult_vals[] = {
      { NJACK_SETRESULT_SUCCESS,    "Success" },
      { NJACK_SETRESULT_FAILAUTH,   "Failauth" },

      { 0,  NULL }
};

/* General settings TAB */ 
static const value_string njack_dhcpcontrol[] = {
      { 0,  "Disable" },
      { 1,  "Enable" },

      { 0,  NULL }
};
/* End General settings TAB */ 

/* Port settings TAB */
static const true_false_string tfs_port_state = {
      "Disable",
      "Enable"
};

static const true_false_string tfs_port_autoneg = {
      "Manual",
      "Auto negotiation"
};

static const true_false_string tfs_port_speed = {
      "10Mbps",
      "100Mbps"
};

static const true_false_string tfs_port_duplex = {
      "halfduplex",
      "duplex"
};

/* End Port settings TAB */

/* Hardware Settings TAB */
static const value_string njack_scheduling[] = {
      { 0,  "Weighted fair" },
      { 1,  "Strict priority" },

      { 0,  NULL }
};

static const value_string njack_addtagscheme[] = {
      { 0,  "Frames transmitted unmodified" },
      { 1,  "Add tag to untagged frame" },

      { 0,  NULL }
};

static const value_string njack_portingressmode[] = {
      { 0,  "Receive unmodified" },
      { 1,  "Remove tag if present" },

      { 0,  NULL }
};

static const value_string njack_maxframesize[] = {
      { 0,  "1522 tagged, 1518 untagged" },
      { 1,  "1535" },

      { 0,  NULL }
};

static const value_string njack_countermode[] = {
      { 0,  "Count Rx, Tx Good frames" },
      { 1,  "RX errors, TX collisions" },

      { 0,  NULL }
};

static const value_string njack_powerforwarding[] = {
      { 1,  "OFF" },
      { 2,  "ON" },
      /* XXX find out correct value */
      { 3,  "802.3af" },

      { 0,  NULL }
};
/* End Hardware Settings TAB */

/* SNMP TAB */
static const value_string njack_snmpwrite[] = {
      { 0,  "Disable" },
      { 1,  "Enable" },

      { 0,  NULL }
};

static const value_string njack_snmptrap[] = {
      { 0,  "Disable" },
      { 1,  "Enable" },

      { 0,  NULL }
};

static const value_string njack_coldstarttrap[] = {
      { 0,  "Disable" },
      { 1,  "Enable" },

      { 0,  NULL }
};

static const value_string njack_linkdowntrap[] = {
      { 0,  "Disable" },
      { 1,  "Enable" },

      { 0,  NULL }
};

static const value_string njack_linkuptrap[] = {
      { 0,  "Disable" },
      { 1,  "Enable" },

      { 0,  NULL }
};

static const value_string njack_authfailtrap[] = {
      { 0,  "Disable" },
      { 1,  "Enable" },

      { 0,  NULL }
};
/* End SNMP TAB */

static int
dissect_portsettings(tvbuff_t *tvb, proto_tree *port_tree, guint32 offset)
{
      /* XXX This is still work in progress, the information here
       *     may be wrong and is obviously incomplete
       *  Structure: 8 bytes, total 64 bits.
       *
       * Bytes 0-1: select feature
       *       2-7: feature values
       *  Feature       Indicator   Valuebit(s)
       *  ------------------------------------------------------------
       *  Port Vlan           0x8000            0x0000 0078 0000 (bits: port 4 ... 1)
       *  Prio (hw queue)     0x4000            0x0000 0006 0000
       *  MC rate limit 0x1000            0x0000 6000 0000 (0:3, 1:6, 2:12, 3:100%)
       *  Speed/Duplex  0x0c00            XXX don't know which bit is speed / duplex
       *                            0x0000 0800 0000 (duplex 0 half, 1 full)
       *                            0x0000 1000 0000 (speed 0 10M, 1 100M)
       *  Port Ena            0x0100            0x0000 0300 0000 (1 dis, 3 ena)
       *  Auto neg            0x0008            0x0000 0000 0800 (0 man, 1 auto)
       *  Vlan number   0x0004            0xff0f 0000 0000 (le)
       * XXX evaluate the following stuff:
       *  Flowcontrol         0x0001            0x0000 0000 0200 ???
       *  Flowcontrol         0x0001            0x0100 83f1 0a00 <- recorded
       *  Auto Mdi            0x0002            0x0000 0000 0300 (1 man, 2 auto)
       *  Manual MDI          0x0002            0x0100 8371 0900 <- recorded
       *  Manual MDI-X  0x0002            0x0100 8371 0800 <- recorded
       *  Auto MDI-X
       */
      proto_tree_add_item(port_tree, hf_njack_tlv_data,
            tvb, offset, 8, FALSE);
      return offset;
}

static int
dissect_tlvs(tvbuff_t *tvb, proto_tree *njack_tree, guint32 offset)
{
      guint8 tlv_type;
      guint8 tlv_length;
      proto_item *tlv_item;
      proto_item *tlv_tree;

      for (;;) {
            tlv_type = tvb_get_guint8(tvb, offset);
            /* Special cases that don't have a length field */
            if (tlv_type == NJACK_CMD_ENDOFPACKET) {
                  proto_tree_add_item(njack_tree, hf_njack_tlv_type,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            }
            if (tlv_type == NJACK_CMD_GETALLPARMAMS) {
                  proto_tree_add_item(njack_tree, hf_njack_tlv_type,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  continue;
            }
            tlv_length = tvb_get_guint8(tvb, offset + 1);
            tlv_item = proto_tree_add_text(njack_tree, tvb,
                  offset, tlv_length + 2,
                  "T %02x, L %02x: %s",
                  tlv_type,
                  tlv_length,
                  val_to_str(tlv_type, njack_cmd_vals, "Unknown"));
            tlv_tree = proto_item_add_subtree(tlv_item,
                  ett_njack_tlv_header);
            proto_tree_add_item(tlv_tree, hf_njack_tlv_type,
                  tvb, offset, 1, FALSE);
            offset += 1;
            proto_tree_add_item(tlv_tree, hf_njack_tlv_length,
                  tvb, offset, 1, FALSE);
            offset += 1;
            switch (tlv_type) {
            case NJACK_CMD_STARTOFPARAMS:
                  break;
            case NJACK_CMD_COUNTERMODE:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_countermode,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            case NJACK_CMD_QUEUEING:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_scheduling,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            case NJACK_CMD_ADDTAGSCHEME:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_addtagscheme,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            case NJACK_CMD_REMOVETAG:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_portingressmode,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            case NJACK_CMD_MAXFRAMESIZE:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_maxframesize,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            case NJACK_CMD_ENABLESNMPWRITE:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_snmpwrite,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            case NJACK_CMD_POWERFORWARDING:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_powerforwarding,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            case NJACK_CMD_DHCPCONTROL:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_dhcpcontrol,
                        tvb, offset, 1, FALSE);
                  offset += 1;
                  break;
            case NJACK_CMD_MACADDRESS:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_devicemac,
                        tvb, offset, 6, FALSE);
                  offset += 6;
                  break;
            case NJACK_CMD_VERSION:
                  /* XXX Don't misuse ip address printing here */
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_version,
                        tvb, offset, 4, TRUE);
                  offset += 4;
                  break;
            case NJACK_CMD_IPADDRESS:
            case NJACK_CMD_NETWORK:
            case NJACK_CMD_MASK:
            case NJACK_CMD_IPGATEWAY:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_typeip,
                        tvb, offset, 4, FALSE);
                  offset += 4;
                  break;
            case NJACK_CMD_GROUP:
            case NJACK_CMD_LOCATION:
            case NJACK_CMD_PASSWORD:
            case NJACK_CMD_ROCOMMUNITY:
            case NJACK_CMD_RWCOMMUNITY:
            case 0x25: /* ? */
            case NJACK_CMD_PRODUCTNAME:
            case NJACK_CMD_SERIALNO:
                  proto_tree_add_item(tlv_tree, hf_njack_tlv_typestring,
                        tvb, offset, tlv_length, FALSE);
                  offset += tlv_length;
                  break;
            case NJACK_CMD_PORT1:
            case NJACK_CMD_PORT2:
            case NJACK_CMD_PORT3:
            case NJACK_CMD_PORT4:
                  if (tlv_length == 8) {
                        dissect_portsettings(tvb, tlv_tree, offset);
                  }
                  offset += tlv_length;
                  break;
            default:
                  if (tlv_length > 0) {
                        proto_tree_add_item(tlv_tree, hf_njack_tlv_data,
                              tvb, offset, tlv_length, FALSE);
                        offset += tlv_length;
                  }
                  break;
            }
      }
      return offset;
}

#if 0
#include <epan/crypt-md5.h>

static gboolean
verify_password(tvbuff_t *tvb, const char *password)
{
      /* 1. pad non-terminated password-string to a length of 32 bytes
       *    (padding: 0x01, 0x02, 0x03...)
         * 2. Calculate MD5 of padded password and write it to offset 12 of packet
         * 3. Calculate MD5 of resulting packet and write it to offset 12 of packet
       */

      gboolean is_valid = TRUE;
      const guint8      *packetdata;
      guint32 length;
      guint8      *workbuffer;
      guint i;
      guint8      byte;
      md5_state_t md_ctx;
      md5_byte_t *digest;

      workbuffer=ep_alloc(32);
      digest=ep_alloc(16);

      length = tvb_get_ntohs(tvb, 6);
      packetdata = tvb_get_ptr(tvb, 0, length);
      for (i = 0; i<32 && *password; i++, password++) {
            workbuffer[i] = *password;
      }
      for (byte = 1; i<32; i++, byte++) {
            workbuffer[i] = byte;
      }
      md5_init(&md_ctx);
      md5_append(&md_ctx, workbuffer, 32);
      md5_finish(&md_ctx, digest);
      md5_init(&md_ctx);
      md5_append(&md_ctx, packetdata, 12);
      md5_append(&md_ctx, digest, 16);
      md5_append(&md_ctx, packetdata + 28, length - 28);
      md5_finish(&md_ctx, digest);
      fprintf(stderr, "Calclulated digest: "); /* debugging */
      for (i = 0; i < 16; i++) {
            fprintf(stderr, "%02X", digest[i]); /* debugging */
            if (digest[i] != *(packetdata + 12 + i)) {
                  is_valid = FALSE;
                  break;      
            }
      }
      fprintf(stderr, " (%d)\n", is_valid); /* debugging */

      return is_valid;
}
#endif

static int
dissect_njack(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      proto_item *ti;
      proto_tree *njack_tree = NULL;
      guint32 offset = 0;
      guint8 packet_type;
      guint8 setresult;
      gint remaining;

      packet_type = tvb_get_guint8(tvb, 5);
      if (check_col(pinfo->cinfo, COL_PROTOCOL))
            col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
      if (check_col(pinfo->cinfo, COL_INFO))
            col_add_fstr(pinfo->cinfo, COL_INFO, val_to_str(packet_type,
                  njack_type_vals, "Type 0x%02x"));

      if (tree) {
            ti = proto_tree_add_item(tree, proto_njack, tvb, offset, -1,
                FALSE);
            njack_tree = proto_item_add_subtree(ti, ett_njack);

            proto_tree_add_item(njack_tree, hf_njack_magic, tvb, offset, 5,
                  FALSE);
            offset += 5;

            proto_tree_add_item(njack_tree, hf_njack_type, tvb, offset, 1,
                  FALSE);
            offset += 1;
            switch (packet_type) {
            case NJACK_TYPE_SET:
                  /* Type 0x07: S -> M, Magic, type, length (16 bit be) */
                  proto_tree_add_item(njack_tree, hf_njack_set_length, tvb, offset,
                        2, FALSE);
                  offset += 2;
                  proto_tree_add_item(njack_tree, hf_njack_set_salt, tvb, offset,
                        4, TRUE);
                  offset += 4;
                  proto_tree_add_item(njack_tree, hf_njack_set_authdata, tvb, offset,
                        16, FALSE);
                  offset += 16;
                  offset = dissect_tlvs(tvb, njack_tree, offset);
                  break;
            case NJACK_TYPE_SETRESULT:
                  /* Type 0x08: M -> S, Magic, type, setresult (8 bit) */
                  setresult = tvb_get_guint8(tvb, offset);
                  proto_tree_add_item(njack_tree, hf_njack_setresult, tvb, offset,
                        1, FALSE);
                  offset += 1;
                  if (check_col(pinfo->cinfo, COL_INFO))
                        col_append_fstr(pinfo->cinfo, COL_INFO, ": %s",
                              val_to_str(setresult, njack_setresult_vals, "[0x%02x]"));
                  break;
            case NJACK_TYPE_GET:
                  /* Type 0x0b: S -> M, Magic, type, 00 00 63 ff */
                  offset = dissect_tlvs(tvb, njack_tree, offset);
                  break;
            case NJACK_TYPE_QUERYRESP:
                  /* Type 0x02: M -> S, Magic, type, T(8 bit) L(8 bit) V(L bytes) */
            case NJACK_TYPE_GETRESP:
                  /* Type 0x0c: M -> S, Magic, type, T(8 bit) L(8 bit) V(L bytes) */
                  offset = dissect_tlvs(tvb, njack_tree, offset);
                  proto_tree_add_item(njack_tree, hf_njack_getresp_unknown1, tvb, offset,
                        1, FALSE);
                  offset += 1;
                  break;
            case NJACK_TYPE_DHCPINFO: /* not completely understood */
            default:
                  /* Unknown type */
                  remaining = tvb_reported_length_remaining(tvb, offset);
                  if (remaining > 0) {
                        proto_tree_add_item(njack_tree, hf_njack_tlv_data,
                              tvb, offset, remaining, FALSE);
                        offset += remaining;
                  }
                  break;
            }
      }
      return offset;
}

static gboolean
test_njack(tvbuff_t *tvb)
{
      /* We need at least 'NJ200' + 1 Byte packet type */
      if ( !tvb_bytes_exist(tvb, 0, 6) || 
                g_strncasecmp((const char *)tvb_get_ptr(tvb, 0, 5), "NJ200", 5) ) {
            return FALSE;
      }
      return TRUE;
}

static gboolean
dissect_njack_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      if ( !test_njack(tvb) ) {
            return FALSE;
      }
      dissect_njack(tvb, pinfo, tree);
      return TRUE;
}

static int
dissect_njack_static(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      if ( !test_njack(tvb) ) {
            return 0;
      }
      return dissect_njack(tvb, pinfo, tree);
}

void proto_register_njack(void);

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

      /* NJACK header */
            { &hf_njack_magic,
            { "Magic",  "njack.magic", FT_STRING, BASE_DEC, NULL,
                  0x0, "", HFILL }},

            { &hf_njack_type,
            { "Type",   "njack.type", FT_UINT8, BASE_HEX, NULL,
                  0x0, "", HFILL }},

      /* TLV fields */
            { &hf_njack_tlv_type,
            { "TlvType",      "njack.tlv.type", FT_UINT8, BASE_HEX, VALS(njack_cmd_vals),
                  0x0, "", HFILL }},

            { &hf_njack_tlv_length,
            { "TlvLength",    "njack.tlv.length", FT_UINT8, BASE_HEX, NULL,
                  0x0, "", HFILL }},

                { &hf_njack_tlv_data,
                { "TlvData",   "njack.tlv.data", FT_BYTES, BASE_NONE, NULL,
                        0x0, "", HFILL }},

                { &hf_njack_tlv_version,
                { "TlvFwVersion",   "njack.tlv.version", FT_IPv4, BASE_NONE, NULL,
                        0x0, "", HFILL }},

                { &hf_njack_tlv_snmpwrite,
                { "TlvTypeSnmpwrite",   "njack.tlv.snmpwrite", FT_UINT8, BASE_DEC, VALS(&njack_snmpwrite),
                        0x0, "", HFILL }},

                { &hf_njack_tlv_dhcpcontrol,
                { "TlvTypeDhcpControl",   "njack.tlv.dhcpcontrol", FT_UINT8, BASE_DEC, VALS(&njack_dhcpcontrol),
                        0x0, "", HFILL }},

                { &hf_njack_tlv_devicemac,
                { "TlvTypeDeviceMAC",   "njack.tlv.devicemac", FT_ETHER, BASE_NONE, NULL,
                        0x0, "", HFILL }},

            /* XXX dummy entries, to be replaced */
                { &hf_njack_tlv_typeip,
                { "TlvTypeIP",   "njack.tlv.typeip", FT_IPv4, BASE_NONE, NULL,
                        0x0, "", HFILL }},

                { &hf_njack_tlv_typestring,
                { "TlvTypeString",   "njack.tlv.typestring", FT_STRING, BASE_DEC, NULL,
                        0x0, "", HFILL }},

            /* 1st tab */
                { &hf_njack_tlv_scheduling,
                { "TlvTypeScheduling",   "njack.tlv.scheduling", FT_UINT8, BASE_DEC, VALS(&njack_scheduling),
                        0x0, "", HFILL }},

                { &hf_njack_tlv_addtagscheme,
                { "TlvAddTagScheme",   "njack.tlv.addtagscheme", FT_UINT8, BASE_DEC, VALS(&njack_addtagscheme),
                        0x0, "", HFILL }},

                { &hf_njack_tlv_portingressmode,
                { "TlvTypePortingressmode",   "njack.tlv.portingressmode", FT_UINT8, BASE_DEC, VALS(&njack_portingressmode),
                        0x0, "", HFILL }},

                { &hf_njack_tlv_maxframesize,
                { "TlvTypeMaxframesize",   "njack.tlv.maxframesize", FT_UINT8, BASE_DEC, VALS(&njack_maxframesize),
                        0x0, "", HFILL }},

                { &hf_njack_tlv_countermode,
                { "TlvTypeCountermode",   "njack.tlv.contermode", FT_UINT8, BASE_DEC, VALS(&njack_countermode),
                        0x0, "", HFILL }},

                { &hf_njack_tlv_powerforwarding,
                { "TlvTypePowerforwarding",   "njack.tlv.powerforwarding", FT_UINT8, BASE_DEC, VALS(&njack_powerforwarding),
                        0x0, "", HFILL }},

      /* Type 0x07: set */
            { &hf_njack_set_length,
            { "SetLength",    "njack.set.length", FT_UINT16, BASE_HEX, NULL,
                  0x0, "", HFILL }},

            { &hf_njack_set_salt,
            { "Salt",   "njack.set.salt", FT_UINT32, BASE_HEX, NULL,
                  0x0, "", HFILL }},

                { &hf_njack_set_authdata,
                { "Authdata",   "njack.tlv.authdata", FT_BYTES, BASE_NONE, NULL,
                        0x0, "", HFILL }},

      /* Type 0x08: set result */
                { &hf_njack_setresult,
                { "SetResult",   "njack.setresult", FT_UINT8, BASE_HEX, VALS(njack_setresult_vals),
                        0x0, "", HFILL }},

      /* Type 0x0b get */

      /* Type 0x0c get response */
            { &hf_njack_getresp_unknown1,
            { "Unknown1",     "njack.getresp.unknown1", FT_UINT8, BASE_HEX, NULL,
                  0x0, "", HFILL }},

        };
      static gint *ett[] = {
            &ett_njack,
            &ett_njack_tlv_header,
      };

        proto_njack = proto_register_protocol(PROTO_LONG_NAME,
          PROTO_SHORT_NAME, "njack");
        proto_register_field_array(proto_njack, hf, array_length(hf));
      proto_register_subtree_array(ett, array_length(ett));
}

void proto_reg_handoff_njack(void);

void
proto_reg_handoff_njack(void)
{
      dissector_handle_t njack_handle;

      njack_handle = new_create_dissector_handle(dissect_njack_static, proto_njack);
      dissector_add("udp.port", PORT_NJACK_PC, njack_handle);
      /* dissector_add("tcp.port", PORT_NJACK_PC, njack_handle); */
      dissector_add("udp.port", PORT_NJACK_SWITCH, njack_handle);
      /* dissector_add("tcp.port", PORT_NJACK_SWITCH, njack_handle); */

        heur_dissector_add("udp", dissect_njack_heur, proto_njack);
        /* heur_dissector_add("tcp", dissect_njack_heur, proto_njack); */
}


Generated by  Doxygen 1.6.0   Back to index