epan/dissectors/packet-rmcp.c

   1 /* packet-rmcp.c
   2  * Routines for RMCP packet dissection
   3  *
   4  * Duncan Laurie <duncan@sun.com>
   5  *
   6  * $Id$
   7  *
   8  * Ethereal - Network traffic analyzer
   9  * By Gerald Combs <gerald@ethereal.com>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * Copied from packet-tftp.c
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  27  * 02111-1307, USA.
  28  */
  29
  30 #ifdef HAVE_CONFIG_H
  31 # include "config.h"
  32 #endif
  33
  34 #include <glib.h>
  35 #include <epan/packet.h>
  36
  37 /*
  38  * See
  39  *
  40  *      http://www.dmtf.org/standards/standard_alert.php
  41  *
  42  * (the ASF specification includes RMCP)
  43  */
  44
  45 static int proto_rmcp = -1;
  46 static int hf_rmcp_version = -1;
  47 static int hf_rmcp_sequence = -1;
  48 static int hf_rmcp_class = -1;
  49 static int hf_rmcp_type = -1;
  50
  51 static gint ett_rmcp = -1;
  52 static gint ett_rmcp_typeclass = -1;
  53
  54 static dissector_handle_t data_handle;
  55 static dissector_table_t rmcp_dissector_table;
  56
  57 #define UDP_PORT_RMCP           623
  58 #define UDP_PORT_RMCP_SECURE    664
  59
  60 #define RMCP_TYPE_MASK          0x80
  61 #define RMCP_TYPE_NORM          0x00
  62 #define RMCP_TYPE_ACK           0x01
  63
  64 static const value_string rmcp_type_vals[] = {
  65         { RMCP_TYPE_NORM,       "Normal RMCP" },
  66         { RMCP_TYPE_ACK,        "RMCP ACK" },
  67         { 0,                    NULL }
  68 };
  69
  70 #define RMCP_CLASS_MASK         0x1f
  71 #define RMCP_CLASS_ASF          0x06
  72 #define RMCP_CLASS_IPMI         0x07
  73 #define RMCP_CLASS_OEM          0x08
  74
  75 static const value_string rmcp_class_vals[] = {
  76         { RMCP_CLASS_ASF,       "ASF" },
  77         { RMCP_CLASS_IPMI,      "IPMI" },
  78         { RMCP_CLASS_OEM,       "OEM" },
  79         { 0,                    NULL }
  80 };
  81
  82 static int
  83 dissect_rmcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  84 {
  85         proto_tree      *rmcp_tree = NULL, *field_tree;
  86         proto_item      *ti, *tf;
  87         tvbuff_t        *next_tvb;
  88         guint8          class;
  89         gchar           *class_str;
  90         guint8          type;
  91
  92         /*
  93          * Check whether it's a known class value; if not, assume it's
  94          * not RMCP.
  95          */
  96         if (!tvb_bytes_exist(tvb, 3, 1))
  97                 return 0;       /* class value byte not present */
  98         class = tvb_get_guint8(tvb, 3);
  99
 100         /* Get the normal/ack bit from the RMCP class */
 101         type = (class & RMCP_TYPE_MASK) >> 7;
 102         class &= RMCP_CLASS_MASK;
 103
 104         class_str = match_strval(class, rmcp_class_vals);
 105         if (class_str == NULL)
 106                 return 0;       /* unknown class value */
 107
 108         if (check_col(pinfo->cinfo, COL_PROTOCOL))
 109                 col_set_str(pinfo->cinfo, COL_PROTOCOL, "RMCP");
 110         if (check_col(pinfo->cinfo, COL_INFO))
 111                 col_add_fstr(pinfo->cinfo, COL_INFO, "%s, Class: %s",
 112                      val_to_str(type, rmcp_type_vals, "Unknown (0x%02x)"),
 113                      class_str);
 114
 115         if (tree) {
 116                 ti = proto_tree_add_protocol_format(tree, proto_rmcp, tvb, 0, 4,
 117                          "Remote Management Control Protocol, Class: %s",
 118                          class_str);
 119                 rmcp_tree = proto_item_add_subtree(ti, ett_rmcp);
 120
 121                 proto_tree_add_item(rmcp_tree, hf_rmcp_version, tvb, 0, 1, TRUE);
 122                 proto_tree_add_item(rmcp_tree, hf_rmcp_sequence, tvb, 2, 1, TRUE);
 123
 124                 tf = proto_tree_add_text(rmcp_tree, tvb, 3, 1, "Type: %s, Class: %s",
 125                          val_to_str(type, rmcp_type_vals, "Unknown (0x%02x)"),
 126                          class_str);
 127
 128                 field_tree = proto_item_add_subtree(tf, ett_rmcp_typeclass);
 129
 130                 proto_tree_add_item(field_tree, hf_rmcp_class, tvb, 3, 1, TRUE);
 131                 proto_tree_add_item(field_tree, hf_rmcp_type, tvb, 3, 1, TRUE);
 132         }
 133
 134         next_tvb = tvb_new_subset(tvb, 4, -1, -1);
 135
 136         if (!dissector_try_port(rmcp_dissector_table, class, next_tvb, pinfo,
 137             tree))
 138                 call_dissector(data_handle, next_tvb, pinfo, tree);
 139
 140         return tvb_length(tvb);
 141 }
 142
 143 void
 144 proto_register_rmcp(void)
 145 {
 146         static hf_register_info hf[] = {
 147                 { &hf_rmcp_version, {
 148                         "Version", "rmcp.version",
 149                         FT_UINT8, BASE_HEX, NULL, 0,
 150                         "RMCP Version", HFILL }},
 151                 { &hf_rmcp_sequence, {
 152                         "Sequence", "rmcp.sequence",
 153                         FT_UINT8, BASE_HEX, NULL, 0,
 154                         "RMCP Sequence", HFILL }},
 155                 { &hf_rmcp_class, {
 156                         "Class", "rmcp.class",
 157                         FT_UINT8, BASE_HEX,
 158                         VALS(rmcp_class_vals), RMCP_CLASS_MASK,
 159                         "RMCP Class", HFILL }},
 160                 { &hf_rmcp_type, {
 161                         "Message Type", "rmcp.type",
 162                         FT_UINT8, BASE_HEX,
 163                         VALS(rmcp_type_vals), RMCP_TYPE_MASK,
 164                         "RMCP Message Type", HFILL }},
 165         };
 166         static gint *ett[] = {
 167                 &ett_rmcp,
 168                 &ett_rmcp_typeclass,
 169         };
 170
 171         proto_rmcp = proto_register_protocol(
 172                 "Remote Management Control Protocol", "RMCP", "rmcp");
 173
 174         proto_register_field_array(proto_rmcp, hf, array_length(hf));
 175         proto_register_subtree_array(ett, array_length(ett));
 176
 177         rmcp_dissector_table = register_dissector_table(
 178                 "rmcp.class", "RMCP Class", FT_UINT8, BASE_HEX);
 179 }
 180
 181 void
 182 proto_reg_handoff_rmcp(void)
 183 {
 184         dissector_handle_t rmcp_handle;
 185
 186         data_handle = find_dissector("data");
 187
 188         rmcp_handle = new_create_dissector_handle(dissect_rmcp, proto_rmcp);
 189         dissector_add("udp.port", UDP_PORT_RMCP, rmcp_handle);
 190         dissector_add("udp.port", UDP_PORT_RMCP_SECURE, rmcp_handle);
 191 }