epan/dissectors/packet-flexnet.c

   1 /* packet-flexnet.c
   2  *
   3  * Routines for Amateur Packet Radio protocol dissection
   4  * Copyright 2005,2006,2007,2008,2009,2010,2012 R.W. Stearn <richard@rns-stearn.demon.co.uk>
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  25  */
  26
  27 /*
  28  * Information on the protocol drawn from:
  29  *
  30  * Inspiration on how to build the dissector drawn from
  31  *   packet-sdlc.c
  32  *   packet-x25.c
  33  *   packet-lapb.c
  34  *   paket-gprs-llc.c
  35  *   xdlc.c
  36  * with the base file built from README.developers.
  37  */
  38
  39 #include "config.h"
  40
  41 #include <glib.h>
  42
  43 #include <epan/packet.h>
  44 #include <epan/ax25_pids.h>
  45
  46 #define FLEXNET_ADRLEN  15
  47 #define FLEXNET_CTLLEN  15
  48 #define FLEXNET_HDRLEN  (FLEXNET_ADRLEN + FLEXNET_ADRLEN + FLEXNET_CTLLEN)
  49
  50 static dissector_handle_t default_handle;
  51
  52 static int proto_flexnet        = -1;
  53 static int hf_flexnet_dst       = -1;
  54 static int hf_flexnet_src       = -1;
  55 static int hf_flexnet_ctl       = -1;
  56
  57 static gint ett_flexnet = -1;
  58 static gint ett_flexnet_ctl = -1;
  59
  60 static void
  61 dissect_flexnet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
  62 {
  63         tvbuff_t   *next_tvb;
  64
  65         col_set_str( pinfo->cinfo, COL_PROTOCOL, "Flexnet");
  66         col_clear( pinfo->cinfo, COL_INFO );
  67
  68         if ( parent_tree )
  69                 {
  70                 proto_item *ti;
  71                 proto_tree *flexnet_tree;
  72                 int         offset;
  73
  74                 /* create display subtree for the protocol */
  75
  76                 ti = proto_tree_add_protocol_format( parent_tree, proto_flexnet, tvb, 0, FLEXNET_HDRLEN, "FLEXNET" );
  77
  78                 flexnet_tree = proto_item_add_subtree( ti, ett_flexnet );
  79
  80                 offset = 0;
  81
  82                 proto_tree_add_item( flexnet_tree, hf_flexnet_dst, tvb, offset, FLEXNET_ADRLEN, ENC_NA );
  83                 offset +=FLEXNET_ADRLEN;
  84
  85                 proto_tree_add_item( flexnet_tree, hf_flexnet_src, tvb, offset, FLEXNET_ADRLEN, ENC_NA );
  86                 offset +=FLEXNET_ADRLEN;
  87
  88                 proto_tree_add_item( flexnet_tree, hf_flexnet_ctl, tvb, offset, FLEXNET_CTLLEN, ENC_NA );
  89                 /* offset +=FLEXNET_CTLLEN; */
  90                 }
  91
  92         /* Call sub-dissectors here */
  93
  94         next_tvb = tvb_new_subset_remaining(tvb, FLEXNET_HDRLEN);
  95         call_dissector( default_handle , next_tvb, pinfo, parent_tree );
  96 }
  97
  98 void
  99 proto_register_flexnet(void)
 100 {
 101         /* Setup list of header fields */
 102         static hf_register_info hf[] = {
 103                 { &hf_flexnet_dst,
 104                         { "Destination",                "flexnet.dst",
 105                         FT_BYTES, BASE_NONE, NULL, 0x0,
 106                         "Destination address", HFILL }
 107                 },
 108                 { &hf_flexnet_src,
 109                         { "Source",                     "flexnet.src",
 110                         FT_BYTES, BASE_NONE, NULL, 0x0,
 111                         "Source address", HFILL }
 112                 },
 113                 { &hf_flexnet_ctl,
 114                         { "Control",                    "flexnet.ctl",
 115                         FT_BYTES, BASE_NONE, NULL, 0x0,
 116                         NULL, HFILL }
 117                 },
 118         };
 119
 120         /* Setup protocol subtree array */
 121         static gint *ett[] = {
 122                 &ett_flexnet,
 123                 &ett_flexnet_ctl,
 124         };
 125
 126         /* Register the protocol name and description */
 127         proto_flexnet = proto_register_protocol("FlexNet", "FLEXNET", "flexnet");
 128
 129         /* Required function calls to register the header fields and subtrees used */
 130         proto_register_field_array( proto_flexnet, hf, array_length( hf ) );
 131         proto_register_subtree_array( ett, array_length( ett ) );
 132 }
 133
 134 void
 135 proto_reg_handoff_flexnet(void)
 136 {
 137         dissector_add_uint( "ax25.pid", AX25_P_FLEXNET, create_dissector_handle( dissect_flexnet, proto_flexnet ) );
 138
 139         /*
 140          */
 141         default_handle  = find_dissector( "data" );
 142
 143 }