epan/dissectors/packet-ddtp.c

   1 /* packet-ddtp.c
   2  * Routines for DDTP (Dynamic DNS Tools Protocol) packet disassembly
   3  * see http://ddt.sourceforge.net/
   4  * Olivier Abad <oabad@noos.fr>
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 2000
  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 #include "config.h"
  28
  29 #include <glib.h>
  30 #include <epan/packet.h>
  31 #include "packet-ddtp.h"
  32
  33 void proto_register_ddtp (void);
  34 void proto_reg_handoff_ddtp (void);
  35
  36 static int proto_ddtp = -1;
  37 static int hf_ddtp_version = -1;
  38 static int hf_ddtp_encrypt = -1;
  39 static int hf_ddtp_hostid = -1;
  40 static int hf_ddtp_msgtype = -1;
  41 static int hf_ddtp_opcode = -1;
  42 static int hf_ddtp_ipaddr = -1;
  43 static int hf_ddtp_status = -1;
  44
  45 static int ett_ddtp = -1;
  46
  47 #define UDP_PORT_DDTP   1052
  48
  49 /*
  50  * XXX - is 0 an invalid value?  If so, should we remove it from this
  51  * list, so that putative DDNS packets with a version number of 0 are
  52  * rejected?
  53  */
  54 static const value_string vals_ddtp_version[] = {
  55     { DDTP_VERSION_ERROR, "Protocol Error" },
  56     { DDTP_VERSION_4,     "4" },
  57     { DDTP_VERSION_5,     "5" },
  58     { 0, NULL}
  59 };
  60
  61 static const value_string vals_ddtp_encrypt[] = {
  62     { DDTP_ENCRYPT_ERROR,     "Encryption Error" },
  63     { DDTP_ENCRYPT_PLAINTEXT, "Plain text" },
  64     { DDTP_ENCRYPT_BLOWFISH,  "Blowfish" },
  65     { 0, NULL}
  66 };
  67
  68 static const value_string vals_ddtp_msgtype[] = {
  69     { DDTP_MESSAGE_ERROR, "Message Error" },
  70     { DDTP_UPDATE_QUERY,  "Update Query" },
  71     { DDTP_UPDATE_REPLY,  "Update Reply" },
  72     { DDTP_ALIVE_QUERY,   "Alive Query" },
  73     { DDTP_ALIVE_REPLY,   "Alive Reply" },
  74     { 0, NULL}
  75 };
  76
  77 static const value_string vals_ddtp_opcode[] = {
  78     { DDTP_MARK_ONLINE,  "Mark online" },
  79     { DDTP_MARK_OFFLINE, "Mark offline" },
  80     { 0, NULL}
  81 };
  82
  83 static const value_string vals_ddtp_status[] = {
  84     { DDTP_UPDATE_SUCCEEDED, "Update succeeded" },
  85     { DDTP_UPDATE_FAILED,    "Update failed" },
  86     { DDTP_INVALID_PASSWORD, "Invalid password" },
  87     { DDTP_INVALID_ACCOUNT,  "Invalid account" },
  88     { DDTP_INVALID_OPCODE,   "Invalid opcode" },
  89     { 0, NULL}
  90 };
  91
  92 static int
  93 dissect_ddtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
  94 {
  95     proto_tree *ddtp_tree = NULL;
  96     proto_item *ti;
  97
  98     /*
  99      * If we don't recognize the version number, don't dissect this.
 100      */
 101     if (tvb_length(tvb) >= 4) {
 102         if (try_val_to_str(tvb_get_ntohl(tvb, 0), vals_ddtp_version) == NULL)
 103             return 0;
 104     }
 105
 106     /* Indicate what kind of message this is. */
 107     col_set_str (pinfo->cinfo, COL_PROTOCOL, "DDTP");
 108     /* In case we throw an exception below. */
 109     col_clear (pinfo->cinfo, COL_INFO);
 110
 111     if (tree) {
 112         ti = proto_tree_add_item(tree, proto_ddtp, tvb, 0, -1, ENC_NA);
 113         ddtp_tree = proto_item_add_subtree(ti, ett_ddtp);
 114
 115         proto_tree_add_item(ddtp_tree, hf_ddtp_version, tvb, 0, 4, ENC_BIG_ENDIAN);
 116         proto_tree_add_item(ddtp_tree, hf_ddtp_encrypt, tvb, 4, 4, ENC_BIG_ENDIAN);
 117         proto_tree_add_item(ddtp_tree, hf_ddtp_hostid, tvb, 8, 4, ENC_BIG_ENDIAN);
 118     }
 119     if (tvb_get_ntohl(tvb, 4) == DDTP_ENCRYPT_PLAINTEXT) {
 120         if (tree)
 121             proto_tree_add_item(ddtp_tree, hf_ddtp_msgtype, tvb, 12, 4, ENC_BIG_ENDIAN);
 122         switch (tvb_get_ntohl(tvb, 12)) {
 123         case DDTP_MESSAGE_ERROR :
 124             col_set_str(pinfo->cinfo, COL_INFO, "Message Error");
 125             break;
 126         case DDTP_UPDATE_QUERY :
 127             col_set_str(pinfo->cinfo, COL_INFO, "Update Query");
 128             if (tree) {
 129                 proto_tree_add_item(ddtp_tree, hf_ddtp_opcode, tvb, 16, 4,
 130                         ENC_BIG_ENDIAN);
 131                 proto_tree_add_item(ddtp_tree, hf_ddtp_ipaddr, tvb, 20, 4,
 132                         ENC_BIG_ENDIAN);
 133             }
 134             break;
 135         case DDTP_UPDATE_REPLY :
 136             col_set_str(pinfo->cinfo, COL_INFO, "Update Reply");
 137             if (tree) {
 138                 proto_tree_add_item(ddtp_tree, hf_ddtp_status, tvb, 16, 4,
 139                         ENC_BIG_ENDIAN);
 140             }
 141             break;
 142         case DDTP_ALIVE_QUERY :
 143             col_set_str(pinfo->cinfo, COL_INFO, "Alive Query");
 144             if (tree) {
 145                 proto_tree_add_text(ddtp_tree, tvb, 16, 4, "Dummy : %u",
 146                         tvb_get_ntohl(tvb, 16));
 147             }
 148             break;
 149         case DDTP_ALIVE_REPLY :
 150             col_set_str(pinfo->cinfo, COL_INFO, "Alive Reply");
 151             if (tree) {
 152                 proto_tree_add_text(ddtp_tree, tvb, 16, 4, "Dummy : %u",
 153                         tvb_get_ntohl(tvb, 16));
 154             }
 155             break;
 156         default :
 157             col_set_str(pinfo->cinfo, COL_INFO, "Unknown type");
 158             if (tree) {
 159                 proto_tree_add_text(ddtp_tree, tvb, 12, 4, "Unknown type : %u",
 160                         tvb_get_ntohl(tvb, 12));
 161             }
 162         }
 163     } else {
 164         col_set_str(pinfo->cinfo, COL_INFO, "Encrypted payload");
 165     }
 166     return tvb_length(tvb);
 167 }
 168
 169 void
 170 proto_register_ddtp(void)
 171 {
 172     static hf_register_info hf_ddtp[] = {
 173         { &hf_ddtp_version,
 174             { "Version", "ddtp.version", FT_UINT32, BASE_DEC, VALS(vals_ddtp_version), 0x0,
 175                 NULL, HFILL }},
 176         { &hf_ddtp_encrypt,
 177             { "Encryption", "ddtp.encrypt", FT_UINT32, BASE_DEC, VALS(vals_ddtp_encrypt), 0x0,
 178                 "Encryption type", HFILL }},
 179         { &hf_ddtp_hostid,
 180             { "Hostid", "ddtp.hostid", FT_UINT32, BASE_DEC, NULL, 0x0,
 181                 "Host ID", HFILL }},
 182         { &hf_ddtp_msgtype,
 183             { "Message type", "ddtp.msgtype", FT_UINT32, BASE_DEC, VALS(vals_ddtp_msgtype), 0x0,
 184                 NULL, HFILL }},
 185         { &hf_ddtp_opcode,
 186             { "Opcode", "ddtp.opcode", FT_UINT32, BASE_DEC, VALS(vals_ddtp_opcode), 0x0,
 187                 "Update query opcode", HFILL }},
 188         { &hf_ddtp_ipaddr,
 189             { "IP address", "ddtp.ipaddr", FT_IPv4, BASE_NONE, NULL, 0x0,
 190                 NULL, HFILL }},
 191         { &hf_ddtp_status,
 192             { "Status", "ddtp.status", FT_UINT32, BASE_DEC, VALS(vals_ddtp_status), 0x0,
 193                 "Update reply status", HFILL }}
 194     };
 195
 196     static gint *ett[] = { &ett_ddtp };
 197
 198     proto_ddtp = proto_register_protocol("Dynamic DNS Tools Protocol",
 199                                          "DDTP", "ddtp");
 200     proto_register_field_array(proto_ddtp, hf_ddtp, array_length(hf_ddtp));
 201     proto_register_subtree_array(ett, array_length(ett));
 202 }
 203
 204 void
 205 proto_reg_handoff_ddtp(void)
 206 {
 207     dissector_handle_t ddtp_handle;
 208
 209     ddtp_handle = new_create_dissector_handle(dissect_ddtp, proto_ddtp);
 210     dissector_add_uint("udp.port", UDP_PORT_DDTP, ddtp_handle);
 211 }