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 void proto_register_xyplex(void);
  36 void proto_reg_handoff_xyplex(void);
  37
  38 static int proto_xyplex = -1;
  39 static int hf_xyplex_type = -1;
  40 static int hf_xyplex_pad = -1;
  41 static int hf_xyplex_server_port = -1;
  42 static int hf_xyplex_return_port = -1;
  43 static int hf_xyplex_reserved = -1;
  44 static int hf_xyplex_reply = -1;
  45
  46 static gint ett_xyplex = -1;
  47
  48 static dissector_handle_t xyplex_handle;
  49
  50 #define UDP_PORT_XYPLEX    173
  51
  52 #define XYPLEX_REG_OK           0x00
  53 #define XYPLEX_REG_QUEFULL      0x05
  54
  55 static const value_string xyplex_reg_vals[] = {
  56   { XYPLEX_REG_OK,      "OK" },
  57   { XYPLEX_REG_QUEFULL, "Queue Full" },
  58   { 0,          NULL }
  59 };
  60
  61 static int
  62 dissect_xyplex(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
  63 {
  64         proto_tree      *xyplex_tree = NULL;
  65         proto_item      *ti;
  66         conversation_t  *conversation;
  67         gint            offset = 0;
  68
  69         guint8          prototype;
  70         guint8          padding;
  71         guint16         server_port;
  72         guint16         return_port;
  73         guint16         reserved;
  74         guint16         reply;
  75
  76         col_set_str(pinfo->cinfo, COL_PROTOCOL, "XYPLEX");
  77
  78         if (tree) {
  79           ti = proto_tree_add_item(tree, proto_xyplex, tvb, offset, -1, ENC_NA);
  80           xyplex_tree = proto_item_add_subtree(ti, ett_xyplex);
  81         }
  82
  83         if (pinfo->destport == UDP_PORT_XYPLEX) {
  84                 /* This is a registration request from a Unix server
  85                  * to the Xyplex server.  The server_port indicates
  86                  * which Xyplex serial port is desired.  The
  87                  * return_port tells the Xyplex server what TCP port
  88                  * to open to the Unix server.
  89                  */
  90                 prototype = tvb_get_guint8(tvb, offset);
  91                 padding = tvb_get_guint8(tvb, offset+1);
  92                 server_port = tvb_get_ntohs(tvb, offset+2);
  93                 return_port = tvb_get_ntohs(tvb, offset+4);
  94                 reserved = tvb_get_ntohs(tvb, offset+6);
  95                 col_add_fstr(pinfo->cinfo, COL_INFO,
  96                           "Registration Request: %d Return: %d",
  97                           server_port, return_port);
  98
  99                 if (tree) {
 100                   proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb,
 101                                     offset, 1, prototype);
 102                   proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb,
 103                                     offset+1, 1, padding);
 104                   proto_tree_add_uint(xyplex_tree, hf_xyplex_server_port, tvb,
 105                                     offset+2, 2, server_port);
 106                   proto_tree_add_uint(xyplex_tree, hf_xyplex_return_port, tvb,
 107                                     offset+4, 2, return_port);
 108                   proto_tree_add_uint(xyplex_tree, hf_xyplex_reserved, tvb,
 109                                     offset+6, 2, reserved);
 110                 }
 111                 offset += 8;
 112
 113                 /* Look for all future TCP conversations between the
 114                  * requestiong server and the Xyplex host using the
 115                  * return_port.
 116                  */
 117                 conversation = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
 118                                   PT_TCP, return_port, 0, NO_PORT_B);
 119                 if (conversation == NULL) {
 120                     conversation = conversation_new(pinfo->fd->num, &pinfo->src, &pinfo->dst,
 121                                     PT_TCP, return_port, 0, NO_PORT2);
 122                     conversation_set_dissector(conversation, xyplex_handle);
 123                 }
 124                 return offset;
 125         }
 126
 127         if (pinfo->srcport == UDP_PORT_XYPLEX) {
 128                 prototype = tvb_get_guint8(tvb, offset);
 129                 padding = tvb_get_guint8(tvb, offset+1);
 130                 reply = tvb_get_ntohs(tvb, offset+2);
 131                 col_add_fstr(pinfo->cinfo, COL_INFO, "Registration Reply: %s",
 132                         val_to_str(reply, xyplex_reg_vals, "Unknown (0x%02x)"));
 133
 134                 if (tree) {
 135                   proto_tree_add_uint(xyplex_tree, hf_xyplex_type, tvb,
 136                                     offset, 1, prototype);
 137                   proto_tree_add_uint(xyplex_tree, hf_xyplex_pad, tvb,
 138                                     offset+1, 1, padding);
 139                   proto_tree_add_uint(xyplex_tree, hf_xyplex_reply, tvb,
 140                                     offset+2, 2, reply);
 141                 }
 142                 offset += 4;
 143                 return offset;
 144         }
 145
 146         /*
 147          * This must be the TCP data stream.  This will just be
 148          * the raw data being transfered from the remote server
 149          * and the Xyplex serial port.
 150          */
 151         col_add_fstr(pinfo->cinfo, COL_INFO, "%d > %d Data",
 152                   pinfo->srcport, pinfo->destport);
 153
 154         proto_tree_add_text(xyplex_tree, tvb, offset, -1,
 155                 "Data (%d bytes)", tvb_reported_length_remaining(tvb, offset));
 156
 157         return tvb_reported_length_remaining(tvb, offset);
 158 }
 159
 160
 161 void
 162 proto_register_xyplex(void)
 163 {
 164   static hf_register_info hf[] = {
 165     { &hf_xyplex_type,
 166       { "Type",       "xyplex.type",
 167         FT_UINT8, BASE_DEC, NULL, 0x0,
 168         "Protocol type", HFILL }},
 169
 170     { &hf_xyplex_pad,
 171       { "Pad",        "xyplex.pad",
 172         FT_UINT8, BASE_DEC, NULL, 0x0,
 173         "Padding", HFILL }},
 174
 175     { &hf_xyplex_server_port,
 176       { "Server Port",        "xyplex.server_port",
 177         FT_UINT16, BASE_DEC, NULL, 0x0,
 178         NULL, HFILL }},
 179
 180     { &hf_xyplex_return_port,
 181       { "Return Port",   "xyplex.return_port",
 182         FT_UINT16, BASE_DEC, NULL, 0x0,
 183         NULL, HFILL }},
 184
 185     { &hf_xyplex_reserved,
 186       { "Reserved field",  "xyplex.reserved",
 187         FT_UINT16, BASE_DEC, NULL, 0x0,
 188         NULL, HFILL }},
 189
 190     { &hf_xyplex_reply,
 191       { "Registration Reply",  "xyplex.reply",
 192         FT_UINT16, BASE_DEC, VALS(xyplex_reg_vals), 0x0,
 193         NULL, HFILL }},
 194
 195   };
 196   static gint *ett[] = {
 197     &ett_xyplex,
 198   };
 199
 200   proto_xyplex = proto_register_protocol("Xyplex", "XYPLEX", "xyplex");
 201   proto_register_field_array(proto_xyplex, hf, array_length(hf));
 202   proto_register_subtree_array(ett, array_length(ett));
 203 }
 204
 205 void
 206 proto_reg_handoff_xyplex(void)
 207 {
 208   xyplex_handle = new_create_dissector_handle(dissect_xyplex, proto_xyplex);
 209   dissector_add_uint("udp.port", UDP_PORT_XYPLEX, xyplex_handle);
 210 }
 211