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packet-asf.c

/* packet-asf.c
 * Routines for ASF packet dissection
 *
 * Duncan Laurie <duncan@sun.com>
 *
 * $Id: packet-asf.c 23194 2007-10-15 20:44:03Z wmeier $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * Copied from packet-rmcp.c
 *
 * 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 <epan/packet.h>

/*
 * See
 *    http://www.dmtf.org/standards/standard_alert.php
 *    http://www.dmtf.org/standards/documents/ASF/DSP0136.pdf
 */

#define RMCP_CLASS_ASF 0x06

static int proto_asf = -1;
static int hf_asf_iana = -1;
static int hf_asf_type = -1;
static int hf_asf_tag = -1;
static int hf_asf_len = -1;

static dissector_handle_t data_handle;
static gint ett_asf = -1;

static const value_string asf_type_vals[] = {
      { 0x10, "Reset" },
      { 0x11, "Power-up" },
      { 0x12, "Unconditional Power-down" },
      { 0x13, "Power Cycle" },
      { 0x40, "Presence Pong" },
      { 0x41, "Capabilities Response" },
      { 0x42, "System State Response" },
      { 0x43, "Open Session Response" },
      { 0x44, "Close Session Response" },
      { 0x80, "Presence Ping" },
      { 0x81, "Capabilities Request" },
      { 0x82, "System State Request" },
      { 0x83, "Open Session Request" },
      { 0x84, "Close Session Request" },
      { 0xC0, "RAKP Message 1" },
      { 0xC1, "RAKP Message 2" },
      { 0xC2, "RAKP Message 3" },
      { 0x00, NULL }
};

static void
dissect_asf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
      proto_tree  *asf_tree = NULL;
      proto_item  *ti;
      guint8            type;
      guint8            len;
      tvbuff_t    *next_tvb;

      if (check_col(pinfo->cinfo, COL_PROTOCOL))
            col_set_str(pinfo->cinfo, COL_PROTOCOL, "ASF");

      if (check_col(pinfo->cinfo, COL_INFO))
            col_clear(pinfo->cinfo, COL_INFO);

      type = tvb_get_guint8(tvb, 4);
      len = tvb_get_guint8(tvb, 7);

      if (check_col(pinfo->cinfo, COL_INFO))
            col_add_str(pinfo->cinfo, COL_INFO,
                 val_to_str(type, asf_type_vals, "Unknown (0x%02x)"));

      if (tree) {
            ti = proto_tree_add_item(tree, proto_asf, tvb, 0, 8, FALSE);
            asf_tree = proto_item_add_subtree(ti, ett_asf);
            proto_tree_add_item(asf_tree, hf_asf_iana, tvb, 0, 4, FALSE);
            proto_tree_add_item(asf_tree, hf_asf_type, tvb, 4, 1, FALSE);
            proto_tree_add_item(asf_tree, hf_asf_tag, tvb, 5, 1, FALSE);
            proto_tree_add_item(asf_tree, hf_asf_len, tvb, 7, 1, FALSE);
      }

      if (len) {
            next_tvb = tvb_new_subset(tvb, 8, -1, len);
            call_dissector(data_handle, next_tvb, pinfo, tree);
      }
}

void
proto_register_asf(void)
{
      static hf_register_info hf[] = {
            { &hf_asf_iana, {
                  "IANA Enterprise Number", "asf.iana",
                  FT_UINT32, BASE_HEX, NULL, 0,
                  "ASF IANA Enterprise Number", HFILL }},
            { &hf_asf_type, {
                  "Message Type", "asf.type",
                  FT_UINT8, BASE_HEX, VALS(asf_type_vals), 0,
                  "ASF Message Type", HFILL }},
            { &hf_asf_tag, {
                  "Message Tag", "asf.tag",
                  FT_UINT8, BASE_HEX, NULL, 0,
                  "ASF Message Tag", HFILL }},
            { &hf_asf_len, {
                  "Data Length", "asf.len",
                  FT_UINT8, BASE_DEC, NULL, 0,
                  "ASF Data Length", HFILL }},
      };
      static gint *ett[] = {
            &ett_asf,
      };

      proto_asf = proto_register_protocol(
            "Alert Standard Forum", "ASF", "asf");

      proto_register_field_array(proto_asf, hf, array_length(hf));
      proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_asf(void)
{
      dissector_handle_t asf_handle;

      data_handle = find_dissector("data");

      asf_handle = create_dissector_handle(dissect_asf, proto_asf);
      dissector_add("rmcp.class", RMCP_CLASS_ASF, asf_handle);
}

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