packet-h1.c

   1 /* packet-h1.c
   2  * Routines for Sinec H1 packet disassembly
   3  * Gerrit Gehnen <G.Gehnen@atrie.de>
   4  *
   5  * $Id: packet-h1.c,v 1.14 2000/11/19 08:53:57 guy Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@zing.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #ifdef HAVE_SYS_TYPES_H
  32 # include <sys/types.h>
  33 #endif
  34
  35 #include <string.h>
  36
  37 #include <glib.h>
  38 #include "packet.h"
  39 #include "globals.h"
  40
  41 static int proto_h1 = -1;
  42 static int hf_h1_header = -1;
  43 static int hf_h1_len = -1;
  44 static int hf_h1_opfield = -1;
  45 static int hf_h1_oplen = -1;
  46 static int hf_h1_opcode = -1;
  47 static int hf_h1_requestblock = -1;
  48 static int hf_h1_requestlen = -1;
  49 static int hf_h1_dbnr = -1;
  50 static int hf_h1_dwnr = -1;
  51 static int hf_h1_dlen = -1;
  52 static int hf_h1_org = -1;
  53 static int hf_h1_response = -1;
  54 static int hf_h1_response_len = -1;
  55 static int hf_h1_response_value = -1;
  56 static int hf_h1_empty_len = -1;
  57 static int hf_h1_empty = -1;
  58
  59 #define EMPTY_BLOCK     0xFF
  60 #define OPCODE_BLOCK    0x01
  61 #define REQUEST_BLOCK   0x03
  62 #define RESPONSE_BLOCK  0x0F
  63
  64 static const value_string opcode_vals[] = {
  65   {3, "Write Request"},
  66   {4, "Write Response"},
  67   {5, "Read Request"},
  68   {6, "Read Response"},
  69   {0, NULL}
  70 };
  71
  72 static const value_string org_vals[] = {
  73   {0x01, "DB"},
  74   {0x02, "MB"},
  75   {0x03, "EB"},
  76   {0x04, "AB"},
  77   {0x05, "PB"},
  78   {0x06, "ZB"},
  79   {0x07, "TB"},
  80   {0x08, "BS"},
  81   {0x09, "AS"},
  82   {0x0a, "DX"},
  83   {0x10, "DE"},
  84   {0x11, "QB"},
  85   {0, NULL}
  86 };
  87
  88 static const value_string returncode_vals[] = {
  89   {0x00, "No error"},
  90   {0x02, "Requested block does not exist"},
  91   {0x03, "Requested block too small"},
  92   {0xFF, "Error, reason unknown"},
  93   {0, NULL}
  94 };
  95
  96 static gint ett_h1 = -1;
  97 static gint ett_opcode = -1;
  98 static gint ett_org = -1;
  99 static gint ett_response = -1;
 100 static gint ett_empty = -1;
 101
 102 static gboolean dissect_h1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
 103 {
 104   tvbuff_t *next_tvb;
 105
 106   proto_tree *h1_tree = NULL;
 107
 108   proto_item *ti;
 109   proto_tree *opcode_tree = NULL;
 110   proto_tree *org_tree = NULL;
 111   proto_tree *response_tree = NULL;
 112   proto_tree *empty_tree = NULL;
 113
 114   unsigned int position = 3;
 115   unsigned int offset=0;
 116
 117   if (!proto_is_protocol_enabled(proto_h1))
 118     return FALSE;
 119
 120   if (!(tvb_get_guint8(tvb,offset) == 'S' && tvb_get_guint8(tvb,offset+1) == '5')) {
 121     return FALSE;
 122     }
 123
 124       if (check_col (pinfo->fd, COL_PROTOCOL))
 125         col_set_str (pinfo->fd, COL_PROTOCOL, "H1");
 126       if (check_col (pinfo->fd, COL_INFO))
 127         col_add_str (pinfo->fd, COL_INFO, "S5: ");
 128       if (tree)
 129         {
 130           ti = proto_tree_add_item (tree, proto_h1, tvb, offset, 16, FALSE);
 131           h1_tree = proto_item_add_subtree (ti, ett_h1);
 132           proto_tree_add_uint (h1_tree, hf_h1_header, tvb, offset, 2,
 133                                tvb_get_ntohs(tvb,offset));
 134           proto_tree_add_uint (h1_tree, hf_h1_len, tvb, offset + 2, 1,
 135                                tvb_get_guint8(tvb,offset+2));
 136         }
 137
 138       while (position < tvb_get_guint8(tvb,offset+2))
 139         {
 140           switch (tvb_get_guint8(tvb,offset + position))
 141             {
 142             case OPCODE_BLOCK:
 143               if (h1_tree)
 144                 {
 145                   ti = proto_tree_add_uint (h1_tree, hf_h1_opfield, tvb,
 146                                             offset + position,
 147                                             tvb_get_guint8(tvb,offset+position+1),
 148                                             tvb_get_guint8(tvb,offset+position));
 149                   opcode_tree = proto_item_add_subtree (ti, ett_opcode);
 150                   proto_tree_add_uint (opcode_tree, hf_h1_oplen, tvb,
 151                                        offset + position + 1, 1,
 152                                        tvb_get_guint8(tvb,offset + position + 1));
 153                   proto_tree_add_uint (opcode_tree, hf_h1_opcode, tvb,
 154                                        offset + position + 2, 1,
 155                                        tvb_get_guint8(tvb,offset + position + 2));
 156                 }
 157               if (check_col (pinfo->fd, COL_INFO))
 158                 {
 159                   col_append_str (pinfo->fd, COL_INFO,
 160                                   val_to_str (tvb_get_guint8(tvb,offset + position + 2),
 161                                                 opcode_vals,"Unknown Opcode (0x%2.2x)"));
 162                 }
 163               break;
 164             case REQUEST_BLOCK:
 165               if (h1_tree)
 166                 {
 167                   ti = proto_tree_add_uint (h1_tree, hf_h1_requestblock, tvb,
 168                                             offset + position,
 169                                             tvb_get_guint8(tvb,offset + position + 1),
 170                                             tvb_get_guint8(tvb,offset + position));
 171                   org_tree = proto_item_add_subtree (ti, ett_org);
 172                   proto_tree_add_uint (org_tree, hf_h1_requestlen, tvb,
 173                                        offset + position + 1, 1,
 174                                        tvb_get_guint8(tvb,offset + position+1));
 175                   proto_tree_add_uint (org_tree, hf_h1_org, tvb,
 176                                        offset + position + 2, 1,
 177                                        tvb_get_guint8(tvb,offset + position+2));
 178                   proto_tree_add_uint (org_tree, hf_h1_dbnr, tvb,
 179                                        offset + position + 3, 1,
 180                                        tvb_get_guint8(tvb,offset + position+3));
 181                   proto_tree_add_uint (org_tree, hf_h1_dwnr, tvb,
 182                                        offset + position + 4, 2,
 183                                        tvb_get_ntohs(tvb,offset+position+4));
 184                   proto_tree_add_int (org_tree, hf_h1_dlen, tvb,
 185                                        offset + position + 6, 2,
 186                                        tvb_get_ntohs(tvb,offset+position+6));
 187                 }
 188               if (check_col (pinfo->fd, COL_INFO))
 189                 {
 190                   col_append_fstr (pinfo->fd, COL_INFO, " %s %d",
 191                                   val_to_str (tvb_get_guint8(tvb,offset + position + 2),
 192                                                  org_vals,"Unknown Type (0x%2.2x)"),
 193                                    tvb_get_guint8(tvb,offset + position + 3));
 194                   col_append_fstr (pinfo->fd, COL_INFO, " DW %d",
 195                                        tvb_get_ntohs(tvb,offset+position+4));
 196                   col_append_fstr (pinfo->fd, COL_INFO, " Count %d",
 197                                        tvb_get_ntohs(tvb,offset+position+6));
 198                 }
 199               break;
 200             case RESPONSE_BLOCK:
 201               if (h1_tree)
 202                 {
 203                   ti = proto_tree_add_uint (h1_tree, hf_h1_response, tvb,
 204                                             offset + position,
 205                                             tvb_get_guint8(tvb,offset + position + 1),
 206                                             tvb_get_guint8(tvb,offset + position));
 207                   response_tree = proto_item_add_subtree (ti, ett_response);
 208                   proto_tree_add_uint (response_tree, hf_h1_response_len, tvb,
 209                                        offset + position + 1, 1,
 210                                        tvb_get_guint8(tvb,offset + position+1));
 211                   proto_tree_add_uint (response_tree, hf_h1_response_value, tvb,
 212                                        offset + position + 2, 1,
 213                                        tvb_get_guint8(tvb,offset + position+2));
 214                 }
 215               if (check_col (pinfo->fd, COL_INFO))
 216                 {
 217                   col_append_fstr (pinfo->fd, COL_INFO, " %s",
 218                                   val_to_str (tvb_get_guint8(tvb,offset + position + 2),
 219                                                  returncode_vals,"Unknown Returcode (0x%2.2x"));
 220                 }
 221               break;
 222             case EMPTY_BLOCK:
 223               if (h1_tree)
 224                 {
 225                   ti = proto_tree_add_uint (h1_tree, hf_h1_empty, tvb,
 226                                             offset + position,
 227                                             tvb_get_guint8(tvb,offset + position + 1),
 228                                             tvb_get_guint8(tvb,offset + position));
 229                   empty_tree = proto_item_add_subtree (ti, ett_empty);
 230
 231                   proto_tree_add_uint (empty_tree, hf_h1_empty_len, tvb,
 232                                        offset + position + 1, 1,
 233                                        tvb_get_guint8(tvb,offset + position+1));
 234                 }
 235               break;
 236             default:
 237               /* This is not a valid telegram. So cancel dissection
 238                  and try the next dissector */
 239                 return FALSE;
 240                 break;
 241             }
 242           position += tvb_get_guint8(tvb,offset + position + 1);        /* Goto next section */
 243         }                       /* ..while */
 244     next_tvb = tvb_new_subset(tvb, offset+tvb_get_guint8(tvb,offset+2), -1, -1);
 245     dissect_data(next_tvb, 0, pinfo, tree);
 246
 247     return TRUE;
 248 }
 249
 250
 251 void
 252 proto_register_h1 (void)
 253 {
 254   static hf_register_info hf[] = {
 255     {&hf_h1_header,
 256      {"H1-Header", "h1.header", FT_UINT16, BASE_HEX, NULL, 0x0,
 257       ""}},
 258     {&hf_h1_len,
 259      {"Length indicator", "h1.len", FT_UINT16, BASE_DEC, NULL, 0x0,
 260       ""}},
 261     {&hf_h1_opfield,
 262      {"Operation identifier", "h1.opfield", FT_UINT8, BASE_HEX, NULL, 0x0,
 263       ""}},
 264     {&hf_h1_oplen,
 265      {"Operation length", "h1.oplen", FT_UINT8, BASE_HEX, NULL, 0x0, ""}},
 266     {&hf_h1_opcode,
 267      {"Opcode", "h1.opcode", FT_UINT8, BASE_HEX, VALS (opcode_vals), 0x0,
 268       ""}},
 269     {&hf_h1_requestblock,
 270      {"Request identifier", "h1.request", FT_UINT8, BASE_HEX, NULL, 0x0,
 271       ""}},
 272     {&hf_h1_requestlen,
 273      {"Request length", "h1.reqlen", FT_UINT8, BASE_HEX, NULL, 0x0,
 274       ""}},
 275     {&hf_h1_org,
 276      {"Memory type", "h1.org", FT_UINT8, BASE_HEX, VALS (org_vals), 0x0,
 277       ""}},
 278     {&hf_h1_dbnr,
 279      {"Memory block number", "h1.dbnr", FT_UINT8, BASE_DEC, NULL, 0x0, ""}},
 280     {&hf_h1_dwnr,
 281      {"Address within memory block", "h1.dwnr", FT_UINT16, BASE_DEC, NULL, 0x0,
 282       ""}},
 283     {&hf_h1_dlen,
 284      {"Length in words", "h1.dlen", FT_INT16, BASE_DEC, NULL, 0x0, ""}},
 285     {&hf_h1_response,
 286      {"Response identifier", "h1.response", FT_UINT8, BASE_HEX, NULL, 0x0, ""}},
 287     {&hf_h1_response_len,
 288      {"Response length", "h1.reslen", FT_UINT8, BASE_DEC, NULL, 0x0,
 289       ""}},
 290     {&hf_h1_response_value,
 291      {"Response value", "h1.resvalue", FT_UINT8, BASE_DEC,
 292       VALS (returncode_vals), 0x0, ""}},
 293     {&hf_h1_empty,
 294      {"Empty field", "h1.empty", FT_UINT8, BASE_HEX, NULL, 0x0,
 295       ""}},
 296     {&hf_h1_empty_len,
 297      {"Empty field length", "h1.empty_len", FT_UINT8, BASE_DEC, NULL, 0x0,
 298       ""}}
 299   };
 300
 301   static gint *ett[] = {
 302     &ett_h1,
 303     &ett_opcode,
 304     &ett_response,
 305     &ett_org,
 306     &ett_empty
 307   };
 308
 309   proto_h1 = proto_register_protocol ("Sinec H1 Protocol", "h1");
 310   proto_register_field_array (proto_h1, hf, array_length (hf));
 311   proto_register_subtree_array (ett, array_length (ett));
 312 }
 313
 314 void
 315 proto_reg_handoff_h1(void)
 316 {
 317   heur_dissector_add("cotp_is", dissect_h1);
 318 }