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 1.8 2000/05/11 08:15:09 gram 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
 103 static gboolean
 104 dissect_h1 (const u_char * pd, int offset, frame_data * fd, proto_tree * tree)
 105 {
 106   proto_tree *h1_tree = NULL;
 107   proto_item *ti;
 108   proto_tree *opcode_tree = NULL;
 109   proto_tree *org_tree = NULL;
 110   proto_tree *response_tree = NULL;
 111   proto_tree *empty_tree = NULL;
 112
 113   unsigned int position = 3;
 114
 115   if (!(pd[offset] == 'S' && pd[offset + 1] == '5')) {
 116     return FALSE;
 117     }
 118
 119       if (check_col (fd, COL_PROTOCOL))
 120         col_add_str (fd, COL_PROTOCOL, "H1");
 121       if (check_col (fd, COL_INFO))
 122         col_add_str (fd, COL_INFO, "S5: ");
 123       if (tree)
 124         {
 125           ti = proto_tree_add_item (tree, proto_h1, NullTVB, offset, 16, NULL);
 126           h1_tree = proto_item_add_subtree (ti, ett_h1);
 127           proto_tree_add_item (h1_tree, hf_h1_header, NullTVB, offset, 2,
 128                                pd[offset] * 0x100 + pd[offset + 1]);
 129           proto_tree_add_item (h1_tree, hf_h1_len, NullTVB, offset + 2, 1,
 130                                pd[offset + 2]);
 131         }
 132
 133       while (position < pd[offset + 2])
 134         {
 135           switch (pd[offset + position])
 136             {
 137             case OPCODE_BLOCK:
 138               if (h1_tree)
 139                 {
 140                   ti = proto_tree_add_item (h1_tree, hf_h1_opfield, NullTVB,
 141                                             offset + position,
 142                                             pd[offset + position + 1],
 143                                             pd[offset + position]);
 144                   opcode_tree = proto_item_add_subtree (ti, ett_opcode);
 145                   proto_tree_add_item (opcode_tree, hf_h1_oplen, NullTVB,
 146                                        offset + position + 1, 1,
 147                                        pd[offset + position + 1]);
 148                   proto_tree_add_item (opcode_tree, hf_h1_opcode, NullTVB,
 149                                        offset + position + 2, 1,
 150                                        pd[offset + position + 2]);
 151                 }
 152               if (check_col (fd, COL_INFO))
 153                 {
 154                   col_append_str (fd, COL_INFO,
 155                                   val_to_str (pd[offset + position + 2],
 156                                                 opcode_vals,"Unknown Opcode (0x%2.2x)"));
 157                 }
 158               break;
 159             case REQUEST_BLOCK:
 160               if (h1_tree)
 161                 {
 162                   ti = proto_tree_add_item (h1_tree, hf_h1_requestblock, NullTVB,
 163                                             offset + position,
 164                                             pd[offset + position + 1],
 165                                             pd[offset + position]);
 166                   org_tree = proto_item_add_subtree (ti, ett_org);
 167                   proto_tree_add_item (org_tree, hf_h1_requestlen, NullTVB,
 168                                        offset + position + 1, 1,
 169                                        pd[offset + position + 1]);
 170                   proto_tree_add_item (org_tree, hf_h1_org, NullTVB,
 171                                        offset + position + 2, 1,
 172                                        pd[offset + position + 2]);
 173                   proto_tree_add_item (org_tree, hf_h1_dbnr, NullTVB,
 174                                        offset + position + 3, 1,
 175                                        pd[offset + position + 3]);
 176                   proto_tree_add_item (org_tree, hf_h1_dwnr, NullTVB,
 177                                        offset + position + 4, 2,
 178                                        pd[offset + position + 4] * 0x100 +
 179                                        pd[offset + position + 5]);
 180                   proto_tree_add_item (org_tree, hf_h1_dlen, NullTVB,
 181                                        offset + position + 6, 2,
 182                                        pd[offset + position + 6] * 0x100 +
 183                                        pd[offset + position + 7]);
 184                 }
 185               if (check_col (fd, COL_INFO))
 186                 {
 187                   col_append_fstr (fd, COL_INFO, " %s %d",
 188                                    val_to_str (pd[offset + position + 2],
 189                                                  org_vals,"Unknown Type (0x%2.2x)"),
 190                                    pd[offset + position + 3]);
 191                   col_append_fstr (fd, COL_INFO, " DW %d",
 192                                    pd[offset + position + 4] * 0x100 +
 193                                    pd[offset + position + 5]);
 194                   col_append_fstr (fd, COL_INFO, " Count %d",
 195                                    pd[offset + position + 6] * 0x100 +
 196                                    pd[offset + position + 7]);
 197                 }
 198               break;
 199             case RESPONSE_BLOCK:
 200               if (h1_tree)
 201                 {
 202                   ti = proto_tree_add_item (h1_tree, hf_h1_response, NullTVB,
 203                                             offset + position,
 204                                             pd[offset + position + 1],
 205                                             pd[offset + position]);
 206                   response_tree = proto_item_add_subtree (ti, ett_response);
 207                   proto_tree_add_item (response_tree, hf_h1_response_len, NullTVB,
 208                                        offset + position + 1, 1,
 209                                        pd[offset + position + 1]);
 210                   proto_tree_add_item (response_tree, hf_h1_response_value, NullTVB,
 211                                        offset + position + 2, 1,
 212                                        pd[offset + position + 2]);
 213                 }
 214               if (check_col (fd, COL_INFO))
 215                 {
 216                   col_append_fstr (fd, COL_INFO, " %s",
 217                                    val_to_str (pd[offset + position + 2],
 218                                                  returncode_vals,"Unknown Returcode (0x%2.2x"));
 219                 }
 220               break;
 221             case EMPTY_BLOCK:
 222               if (h1_tree)
 223                 {
 224                   ti = proto_tree_add_item (h1_tree, hf_h1_empty, NullTVB,
 225                                             offset + position,
 226                                             pd[offset + position + 1],
 227                                             pd[offset + position]);
 228                   empty_tree = proto_item_add_subtree (ti, ett_empty);
 229
 230                   proto_tree_add_item (empty_tree, hf_h1_empty_len, NullTVB,
 231                                        offset + position + 1, 1,
 232                                        pd[offset + position + 1]);
 233                 }
 234               break;
 235             default:
 236               /* This is not a valid telegram. So cancel dissection
 237                  and try the next dissector */
 238                 return FALSE;
 239                 break;
 240             }
 241           position += pd[offset + position + 1];        /* Goto next section */
 242         }                       /* ..while */
 243
 244       dissect_data (pd, offset + pd[offset + 2], fd, tree);
 245       return TRUE;
 246 }
 247
 248
 249 void
 250 proto_register_h1 (void)
 251 {
 252   static hf_register_info hf[] = {
 253     {&hf_h1_header,
 254      {"H1-Header", "h1.header", FT_UINT16, BASE_HEX, NULL, 0x0,
 255       ""}},
 256     {&hf_h1_len,
 257      {"Length indicator", "h1.len", FT_UINT16, BASE_DEC, NULL, 0x0,
 258       ""}},
 259     {&hf_h1_opfield,
 260      {"Operation identifier", "h1.opfield", FT_UINT8, BASE_HEX, NULL, 0x0,
 261       ""}},
 262     {&hf_h1_oplen,
 263      {"Operation length", "h1.oplen", FT_UINT8, BASE_HEX, NULL, 0x0, ""}},
 264     {&hf_h1_opcode,
 265      {"Opcode", "h1.opcode", FT_UINT8, BASE_HEX, VALS (opcode_vals), 0x0,
 266       ""}},
 267     {&hf_h1_requestblock,
 268      {"Request identifier", "h1.request", FT_UINT8, BASE_HEX, NULL, 0x0,
 269       ""}},
 270     {&hf_h1_requestlen,
 271      {"Request length", "h1.reqlen", FT_UINT8, BASE_HEX, NULL, 0x0,
 272       ""}},
 273     {&hf_h1_org,
 274      {"Memory type", "h1.org", FT_UINT8, BASE_HEX, VALS (org_vals), 0x0,
 275       ""}},
 276     {&hf_h1_dbnr,
 277      {"Memory block number", "h1.dbnr", FT_UINT8, BASE_DEC, NULL, 0x0, ""}},
 278     {&hf_h1_dwnr,
 279      {"Address within memory block", "h1.dwnr", FT_UINT16, BASE_DEC, NULL, 0x0,
 280       ""}},
 281     {&hf_h1_dlen,
 282      {"Length in words", "h1.dlen", FT_INT16, BASE_DEC, NULL, 0x0, ""}},
 283     {&hf_h1_response,
 284      {"Response identifier", "h1.response", FT_UINT8, BASE_DEC, NULL, 0x0, ""}},
 285     {&hf_h1_response_len,
 286      {"Response length", "h1.reslen", FT_UINT8, BASE_DEC, NULL, 0x0,
 287       ""}},
 288     {&hf_h1_response_value,
 289      {"Response value", "h1.resvalue", FT_UINT8, BASE_DEC,
 290       VALS (returncode_vals), 0x0, ""}},
 291     {&hf_h1_empty,
 292      {"Empty field", "h1.empty", FT_UINT8, BASE_HEX, NULL, 0x0,
 293       ""}},
 294     {&hf_h1_empty_len,
 295      {"Empty field length", "h1.empty_len", FT_UINT8, BASE_DEC, NULL, 0x0,
 296       ""}}
 297   };
 298
 299   static gint *ett[] = {
 300     &ett_h1,
 301     &ett_opcode,
 302     &ett_response,
 303     &ett_org,
 304     &ett_empty
 305   };
 306
 307   proto_h1 = proto_register_protocol ("Sinec H1 Protocol", "h1");
 308   proto_register_field_array (proto_h1, hf, array_length (hf));
 309   proto_register_subtree_array (ett, array_length (ett));
 310 }
 311
 312 void
 313 proto_reg_handoff_h1(void)
 314 {
 315   heur_dissector_add("cotp_is", dissect_h1);
 316 }