epan/dissectors/packet-xyplex.c

   1 /* packet-xyplex.c
   2  * Routines for xyplex packet dissection
   3  *
   4  * Copyright 2002 Randy McEoin <rmceoin@pe.com>
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  27  */
  28
  29 #include "config.h"
  30
  31 #include <glib.h>
  32 #include <epan/packet.h>
  33 #include <epan/conversation.h>
  34
  35 static int proto_xyplex = -1;
  36 static int hf_xyplex_type = -1;
  37 static int hf_xyplex_pad = -1;
  38 static int hf_xyplex_server_port = -1;
  39 static int hf_xyplex_return_port = -1;
  40 static int hf_xyplex_reserved = -1;
  41 static int hf_xyplex_reply = -1;
  42
  43 static gint ett_xyplex = -1;
  44
  45 static dissector_handle_t xyplex_handle;
  46
  47 #define UDP_PORT_XYPLEX    173
  48
  49 #define XYPLEX_REG_OK           0x00
  50 #define XYPLEX_REG_QUEFULL      0x05
  51
  52 static const value_string xyplex_reg_vals[] = {
  53   { XYPLEX_REG_OK,      "OK" },
  54   { XYPLEX_REG_QUEFULL, "Queue Full" },
  55   { 0,          NULL }
  56 };
  57
  58 static int
  59 dissect_xyplex(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
  60 {
  61         proto_tree      *xyplex_tree = NULL;
  62         proto_item      *ti;
  63         conversation_t  *conversation;
  64         gint            offset = 0;
  65
  66         guint8          prototype;
  67         guint8          padding;
  68         guint16         server_port;
  69         guint16         return_port;
  70         guint16         reserved;
  71         guint16         reply;
  72
  73         col_set_str(pinfo->cinfo, COL_PROTOCOL, "XYPLEX");
  74
  75         if (tree) {
  76           ti = proto_tree_add_item(tree, proto_xyplex, tvb, offset, -1, ENC_NA);
  77           xyplex_tree = proto_item_add_subtree(ti, ett_xyplex);
  78         }
  79
  80         if (pinfo->destport == UDP_PORT_XYPLEX) {
  81                 /* This is a registration request from a Unix server
  82                  * to the Xyplex server.  The server_port indicates
  83                  * which Xyplex serial port is desired.  The
  84                  * return_port tells the Xyplex server what TCP port
  85                  * to open to the Unix server.
  86                  */
  87                 prototype = tvb_get_guint8(tvb, offset);
  88                 padding = tvb_get_guint8(tvb, offset+1);
  89                 server_port = tvb_get_ntohs(tvb, offset+2);
  90                 return_port = tvb_get_ntohs(tvb, offset+4);
  91                 reserved = tvb_get_ntohs(tvb, offset+6);
  92                 col_add_fstr(pinfo->cinfo, COL_INFO,
  93                           "Registration Request: %d Return: %d",
  94                           server_port, return_port);
  95
  96                 if (tree) {
  97                   proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb,
  98                                     offset, 1, prototype);
  99                   proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb,
 100                                     offset+1, 1, padding);
 101                   proto_tree_add_uint(xyplex_tree, hf_xyplex_server_port, tvb,
 102                                     offset+2, 2, server_port);
 103                   proto_tree_add_uint(xyplex_tree, hf_xyplex_return_port, tvb,
 104                                     offset+4, 2, return_port);
 105                   proto_tree_add_uint(xyplex_tree, hf_xyplex_reserved, tvb,
 106                                     offset+6, 2, reserved);
 107                 }
 108                 offset += 8;
 109
 110                 /* Look for all future TCP conversations between the
 111                  * requestiong server and the Xyplex host using the
 112                  * return_port.
 113                  */
 114                 conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
 115                                   PT_TCP, return_port, 0, NO_PORT_B);
 116                 if (conversation == NULL) {
 117                     conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
 118                                     PT_TCP, return_port, 0, NO_PORT2);
 119                     conversation_set_dissector(conversation, xyplex_handle);
 120                 }
 121                 return offset;
 122         }
 123
 124         if (pinfo->srcport == UDP_PORT_XYPLEX) {
 125                 prototype = tvb_get_guint8(tvb, offset);
 126                 padding = tvb_get_guint8(tvb, offset+1);
 127                 reply = tvb_get_ntohs(tvb, offset+2);
 128                 col_add_fstr(pinfo->cinfo, COL_INFO, "Registration Reply: %s",
 129                         val_to_str(reply, xyplex_reg_vals, "Unknown (0x%02x)"));
 130
 131                 if (tree) {
 132                   proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb,
 133                                     offset, 1, prototype);
 134                   proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb,
 135                                     offset+1, 1, padding);
 136                   proto_tree_add_uint(xyplex_tree, hf_xyplex_reply, tvb,
 137                                     offset+2, 2, reply);
 138                 }
 139                 offset += 4;
 140                 return offset;
 141         }
 142
 143         /*
 144          * This must be the TCP data stream.  This will just be
 145          * the raw data being transfered from the remote server
 146          * and the Xyplex serial port.
 147          */
 148         col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d Data",
 149                   pinfo->srcport, pinfo->destport);
 150
 151         proto_tree_add_text(xyplex_tree, tvb, offset, -1,
 152                 "Data (%d bytes)", tvb_reported_length_remaining(tvb, offset));
 153
 154         return tvb_reported_length_remaining(tvb, offset);
 155 }
 156
 157
 158 void
 159 proto_register_xyplex(void)
 160 {
 161   static hf_register_info hf[] = {
 162     { &hf_xyplex_type,
 163       { "Type",       "xyplex.type",
 164         FT_UINT8, BASE_DEC, NULL, 0x0,
 165         "Protocol type", HFILL }},
 166
 167     { &hf_xyplex_pad,
 168       { "Pad",        "xyplex.pad",
 169         FT_UINT8, BASE_DEC, NULL, 0x0,
 170         "Padding", HFILL }},
 171
 172     { &hf_xyplex_server_port,
 173       { "Server Port",        "xyplex.server_port",
 174         FT_UINT16, BASE_DEC, NULL, 0x0,
 175         NULL, HFILL }},
 176
 177     { &hf_xyplex_return_port,
 178       { "Return Port",   "xyplex.return_port",
 179         FT_UINT16, BASE_DEC, NULL, 0x0,
 180         NULL, HFILL }},
 181
 182     { &hf_xyplex_reserved,
 183       { "Reserved field",  "xyplex.reserved",
 184         FT_UINT16, BASE_DEC, NULL, 0x0,
 185         NULL, HFILL }},
 186
 187     { &hf_xyplex_reply,
 188       { "Registration Reply",  "xyplex.reply",
 189         FT_UINT16, BASE_DEC, VALS(xyplex_reg_vals), 0x0,
 190         NULL, HFILL }},
 191
 192   };
 193   static gint *ett[] = {
 194     &ett_xyplex,
 195   };
 196
 197   proto_xyplex = proto_register_protocol("Xyplex", "XYPLEX", "xyplex");
 198   proto_register_field_array(proto_xyplex, hf, array_length(hf));
 199   proto_register_subtree_array(ett, array_length(ett));
 200 }
 201
 202 void
 203 proto_reg_handoff_xyplex(void)
 204 {
 205   xyplex_handle = new_create_dissector_handle(dissect_xyplex, proto_xyplex);
 206   dissector_add_uint("udp.port", UDP_PORT_XYPLEX, xyplex_handle);
 207 }
 208