epan/dissectors/packet-atmtcp.c

   1 /* packet-atmtcp.c
   2  * Routines for ATM over TCP dissection
   3  * Copyright 2011, Alexis La Goutte <alexis.lagoutte at gmail dot com>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 /* Specification...
  27  * http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=blob;f=include/linux/atm_tcp.h;hb=HEAD
  28  * http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=blob;f=drivers/atm/atmtcp.c;hb=HEAD
  29  */
  30
  31 #include "config.h"
  32
  33 #include <glib.h>
  34
  35 #include <epan/packet.h>
  36 #include <epan/prefs.h>
  37
  38 void proto_register_atmtcp(void);
  39 void proto_reg_handoff_atmtcp(void);
  40
  41 static int proto_atmtcp = -1;
  42 static int hf_atmtcp_vpi = -1;
  43 static int hf_atmtcp_vci = -1;
  44 static int hf_atmtcp_length = -1;
  45
  46 static guint global_atmtcp_tcp_port = 2812;
  47
  48 static gint ett_atmtcp = -1;
  49
  50 static dissector_handle_t data_handle;
  51
  52 #define ATMTCP_HDR_MAGIC        (~0)    /* this length indicates a command */
  53 #define ATMTCP_CTRL_OPEN        1       /* request/reply */
  54 #define ATMTCP_CTRL_CLOSE       2       /* request/reply */
  55
  56 static int
  57 dissect_atmtcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
  58 {
  59
  60     proto_item *ti;
  61     proto_tree *atmtcp_tree;
  62     guint       offset = 0;
  63     gint32      length;
  64     tvbuff_t   *next_tvb;
  65
  66     col_set_str(pinfo->cinfo, COL_PROTOCOL, "ATMTCP");
  67
  68     col_set_str(pinfo->cinfo, COL_INFO, "ATMTCP");
  69
  70     if (tree) {
  71         ti = proto_tree_add_item(tree, proto_atmtcp, tvb, 0, -1, ENC_NA);
  72
  73         atmtcp_tree = proto_item_add_subtree(ti, ett_atmtcp);
  74
  75         /* VPI */
  76         proto_tree_add_item(atmtcp_tree, hf_atmtcp_vpi, tvb, offset, 2, ENC_NA);
  77     }
  78     offset += 2;
  79
  80
  81     if (tree) {
  82         /* VCI */
  83         proto_tree_add_item(atmtcp_tree, hf_atmtcp_vci, tvb, offset, 2, ENC_NA);
  84     }
  85     offset += 2;
  86
  87
  88     if (tree) {
  89         /* Length  */
  90         proto_tree_add_item(atmtcp_tree, hf_atmtcp_length, tvb, offset, 4, ENC_NA);
  91     }
  92     length = tvb_get_ntohl(tvb, offset);
  93     if(length == ATMTCP_HDR_MAGIC)
  94     {
  95         col_append_str(pinfo->cinfo, COL_INFO, " Command");
  96     }
  97     else
  98     {
  99         col_append_str(pinfo->cinfo, COL_INFO, " Data");
 100     }
 101     offset += 4;
 102
 103     /* Data (for the moment...) */
 104     next_tvb = tvb_new_subset_remaining(tvb, offset);
 105     call_dissector(data_handle, next_tvb, pinfo, tree);
 106     return tvb_length(tvb);
 107 }
 108
 109
 110 void
 111 proto_register_atmtcp(void)
 112 {
 113     module_t *atmtcp_module;
 114
 115
 116     static hf_register_info hf[] = {
 117         { &hf_atmtcp_vpi,
 118             { "VPI",           "atmtcp.vpi", FT_UINT16, BASE_DEC, NULL, 0x0,
 119               "Virtual Path Identifier", HFILL }
 120         },
 121         { &hf_atmtcp_vci,
 122             { "VCI",           "atmtcp.vci", FT_UINT16, BASE_DEC, NULL, 0x0,
 123               "Virtual Channel Identifier", HFILL }
 124         },
 125         { &hf_atmtcp_length,
 126             { "Length",        "atmtcp.length", FT_UINT32, BASE_DEC, NULL, 0x0,
 127               "length of data", HFILL }
 128         }
 129     };
 130
 131
 132     static gint *ett[] = {
 133         &ett_atmtcp
 134     };
 135
 136
 137     proto_atmtcp = proto_register_protocol("ATM over TCP", "ATMTCP", "atmtcp");
 138
 139     proto_register_field_array(proto_atmtcp, hf, array_length(hf));
 140     proto_register_subtree_array(ett, array_length(ett));
 141
 142
 143     atmtcp_module = prefs_register_protocol(proto_atmtcp, proto_reg_handoff_atmtcp);
 144
 145     prefs_register_uint_preference(atmtcp_module, "tcp.port", "ATMTCP TCP Port",
 146                                     "ATMTCP TCP port if other than the default",
 147                                     10, &global_atmtcp_tcp_port);
 148 }
 149
 150
 151 void
 152 proto_reg_handoff_atmtcp(void)
 153 {
 154     static gboolean initialized = FALSE;
 155     static dissector_handle_t atmtcp_handle;
 156     static int current_port;
 157
 158     if (!initialized) {
 159         atmtcp_handle = new_create_dissector_handle(dissect_atmtcp, proto_atmtcp);
 160         data_handle = find_dissector("data");
 161         initialized = TRUE;
 162     } else {
 163         dissector_delete_uint("tcp.port", current_port, atmtcp_handle);
 164     }
 165
 166     current_port = global_atmtcp_tcp_port;
 167
 168     dissector_add_uint("tcp.port", current_port, atmtcp_handle);
 169 }
 170
 171 /*
 172  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 173  *
 174  * Local variables:
 175  * c-basic-offset: 4
 176  * tab-width: 8
 177  * indent-tabs-mode: nil
 178  * End:
 179  *
 180  * vi: set shiftwidth=4 tabstop=8 expandtab:
 181  * :indentSize=4:tabSize=8:noTabs=true:
 182  */